CA1198980A - Liquid fuel burner having a saveguard feature against interruption of electric power - Google Patents
Liquid fuel burner having a saveguard feature against interruption of electric powerInfo
- Publication number
- CA1198980A CA1198980A CA000413417A CA413417A CA1198980A CA 1198980 A CA1198980 A CA 1198980A CA 000413417 A CA000413417 A CA 000413417A CA 413417 A CA413417 A CA 413417A CA 1198980 A CA1198980 A CA 1198980A
- Authority
- CA
- Canada
- Prior art keywords
- air
- fuel
- supply pipe
- flow
- solenoid
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D5/00—Burners in which liquid fuel evaporates in the combustion space, with or without chemical conversion of evaporated fuel
- F23D5/12—Details
- F23D5/16—Safety devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D5/00—Burners in which liquid fuel evaporates in the combustion space, with or without chemical conversion of evaporated fuel
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
- F24C5/00—Stoves or ranges for liquid fuels
- F24C5/16—Arrangement or mounting of control or safety devices
Abstract
ABSTRACT OF THE DISCLOSURE:
An oil burner comprising a safeguard mechanism against a power stoppage is disclosed which is capable of carrying out a fire extinguishing operation in a complete combustion state upon a power stoppage, to thereby prevent any soot and smelly and toxic combustion product from being produced. The oil burner includes a solenoid valve mechanism having a wiring for allowing the supply of a fuel oil to an oil supply pipe to be stopped upon a power stoppage, an air damper actuated in cooperation with a mechanism for changing the flow rate of a fuel oil supplied to the oil supply pipe, a solenoid connected to the air damper which has a wiring for allowing the air damper to be opened upon a power stoppage, and an air fan rotated due to inertia force at a power stoppage.
An oil burner comprising a safeguard mechanism against a power stoppage is disclosed which is capable of carrying out a fire extinguishing operation in a complete combustion state upon a power stoppage, to thereby prevent any soot and smelly and toxic combustion product from being produced. The oil burner includes a solenoid valve mechanism having a wiring for allowing the supply of a fuel oil to an oil supply pipe to be stopped upon a power stoppage, an air damper actuated in cooperation with a mechanism for changing the flow rate of a fuel oil supplied to the oil supply pipe, a solenoid connected to the air damper which has a wiring for allowing the air damper to be opened upon a power stoppage, and an air fan rotated due to inertia force at a power stoppage.
Description
B~C~G~OUND O~ THE IN~E~TION
Field of the ~nVentiQn This invention relates to an oil burner com-prising a safeguard mechanism against a power stoppage and more particularly to an oil burner capable of accomplishing a fire extinguishing operation in a perfect combustion state without causing any abnormal combustion upon a power stoppage, namely, an interruption o~
electrical service.
Description o~ the Prior Art There has been conventionally known an oil burner which is adapted to vaporize a fuel oil by means of a vaporization means and to form a combustible gas from the vaporized fuel oil in the vaporization means using air supplied thereto. In such con~entional oil burner having a vaporization means, the vaporization means is not pro-vided independent from a combustion means. This results in such conventional oil burner having an important dis-advantage that it carries out an incomplete combustion to produce a large amount of soot and a smelly and/or toxic incomplete combustion product when the ~low rate o~ air supplied is varied due to, for example, the stopping of an air fan. Such disadvantage remarkably appears when the supply of an electrical current to the oil burner is abruptly interrupted due to a power stoppage. Thus, the conventional oil burner o~ such type is not suitable for use in the interior. Recently, there has been proposed an oil burner of such type which is capable of carrying out a fire extinguishing operation in a complete com-bustion while the supply o~ an electrical current to theoil burner is being continued~ However, even such oil burner is not constructed to carry out a fire extinguishing operation in a complete combustion state upon power StQppa~e.
BR~EF SUMMARY OF THE INVENTION
The present invention has been made in view of the foregoing disadvantage in the prior art.
Accordingly, it is an object of the present invention to provide ~n oil burner comprising a safeguard mechanism against a power stoppage, which is capable of carrying out a fire extinguishing operation in a complete combustion state upon a power stoppage as well, so that it does not produce any soot and any smelly and toxic incomplete combustion product.
It is another object of the present invention to provide an oil burner comprising a safeguard mechanism against a power stoppage, which is capable of effectively stopping the supply of a fuel oil upon a power stoppage to more effectively accomplish the above-mentioned object.
It is a further object of the present invention to provide an oil burner comprising a safeguard mechanism against a power stoppage, which is capable of carrying out the above-mentioned objects with a simple construction.
Accordingly, the invention is claimed herein as a liquid fuel burner having a safeguard feature against interruption of electric power, said burner comprising:
an air supply pipe; a liquid fuel supply pipe;
vaporization and ignition means connected to said air and fuel supply pipes for forming and igniting a com-bustible gas from air and liquid fuel supplied throu~h said pipes; means for connecting said burner to a supply of electric current; means for changing the flow rate of fuel through said fuel supply pipe to achieve different rates of combustion; solenoid valve means connected to said fuel supply pipe and said means for connecting for stopping the flow of fuel therethrough upon interruption of a supply of electric current to said burner; air damper means for controlling the flow of air to said air supply pipe; solenoid means connected to said air damper ~9~
means and said means ~or connecting for reducing air flow through said damper means upon connection of supply of electric current to said solenoid means and for increasing air flow through said damper means upon interruption of a supply of electric current to said solenoid means; air fan means connected to said air damper means and said means for connecting for supplying a flow of air through said air supply pipe to said vaporization and ignition means; and weight means operatively con-nected to said air fan means for causing said air fan means to continue to rotate due to inertia force upon interruption of a supply of electric current to said burner; whereby upon interruption of a supply of electric current, said solenoid valve means closes to stop the flow of fuel and said damper means opens to admit a continued flow of air to said vaporization and ignition means to complete combustion of fuel introduced prior to said interruption.
BRIEF DESCRI~TION OF`T~E`DRAWINGS
Other objects and many of the attendant advantages of the present invention will be readily appreciated as the same becomes better understood by reference to the following detailed description when considered in connection with the accompanying drawings, in which like reference numerals designate the same parts throughout the figures thereof and wherein:
Fig. 1 is a vertical sectional view showing an embodiment of an oil burner comprising a safeguard mechanism against a power stoppage according to the present invention;
Fig. 2 is a vertical sectional view showing an example of a mechanism for controlling the flow rate of a fuel oil used in the oil burner shown in Fig. l;
Fig. 3 is a partially sectional view showing an example of an air fan rotated by inertia force upon a power stoppage which forms a part of a safeguard mechanism against a power stoppage incorporated in the oil burner shown in Fig. l; and Fig. 4 is a schematic diagram of a circuit which may be employed ln the oil burner of Fig. 1.
.
DET~ILED DESCRIPTION OF THE PREFERRED EMso~IMENT
Now, an oil burner comprlsing a safeguard mechanism against a power stoppage according to the present invention will be described hereinafter with reference to the accompanying drawings.
Fig. 1 illustrates an embodiment of an oil burner 10 according to the present invention. The oil burner illustrated in Fig. 1 is a red-hot type oil space heater; however, it should be noted that the oil burner is not limited to such oil space heater.
The oil burner 10 shown in Fig. 1 is constructed in such a manner as known in the art, for a safeguard mechanism against a power stoppage incorporated therein.
The oil burner 10 includes a vaporization and ignition means 12 having a heater means (not shown) disposed therein, the heater acting to vaporize and ignite a fuel oil supplied to the means 12 through a fuel oil supply pipe 14 from a fuel oil storage tank (not shown). The vaporization and ignition means 12 has a vaporizing and igniting chamber 16 defined in a lower section thereof which is adapted to vaporize a fuel oil supplied through the supply pipe 14, mix the vaporized fuel oil with an air supplied thereto through an air supply pipe 18 from ambient atmosphere to form a combustible gas, and ignite the combustible gas by means of the heater. As illustrated, air supply pipe 1~ slopes downwardly into chamber 16 and fuel supply pipe 14 empties into air supply pipe 18; so that, fuel and air flow downwardly into chamber 16 through the end portion of pipe 18 connected to chamber 16. The ~aporization and ignition means 12 also has a flame diffusion chamber 20 defined in an upper section thereof and communicated through an opening 22 with the vaporizing and igniting chamber 16. Chamber 20 has a side wall provided with a plurality of through-holes 26 for supplying combustion air from an ambientatmosphere therethrough to the chamber 20. The flame diffusion chamber 20 is provided therein with a flame diffusion means 23 which allows the ignited combustible gas formed in the vaporizing and igniting chamber 16 and supplied to the chamber 20 through the opening 22 tG be diffused and uniformly mixed with the combustion air supplied through the through-holes 26 in the chamber 20.
The oil burner 10 also includes a combustion chamber 30 disposed above the flame diffusion chamber 20 and communicated therewith, which is adapted to burn the ignited combustible gas supplied thereto from the flame diffusion chamber 20. The combustion chamber 30 has an outer perforated combustion cylinder 32 and an inner perforated combustion cylinder 34 each formed of a ceramic material. The combustible gas supplied to the combustion chamber 30 is burned on the outer surface of the inner cylinder 34 and the both surfaces of the outer cylinder 32 to red-heat the cylinders 32 and 34. Around the outer combustion cylinder 32 is disposed a trans-parent cylinder 36 formed of heat-resistant glass through which heat rays are discharged from the com-bustion chamber 30 to the exterior of the oil burner.
Above the combustion chamber 30, an auxiliary combustion chamber 33 is disposed in communication therewith. The auxiliary combustion chamber 38 ser~es to completely burn any combustible gas which may remain in a combustion gas formed in the combustion chamber 30.
Further, the oil burner includes a mechanism 40 for controlling the flow rate of a fuel oil to be supplied to the vaporization and ignition means 12, as schematically shown in Fig. 1 and detailedly shown in Fig. 2. The fuel flow rate controlling mechanism 40 is disposed between the oil supply pipe 14 and the oil storage tank and is constructed in such a manner as known in the art. The controlling mechanism 40 includes a 10at 42, an oil level controling valve 44 connected to the 10at so as to introduce fuel oil into the mechanism 40 in cooperation with the ~loat, a valve 46 for controlling the flow rate of fuel o~l to be supplied from the mechanism 40 through the oil supply pipe 14 to the means 12, a handle 48 ~or actuating the valve 46 through a cam and follower means 50, and a shaft 52 for directly operating the cam and follower means 50.
The controlling mechanism 40 constructed as mentioned above is adapted to control the flow rate of a fuel oil by actuating the valve 46 through the cam and follower means 50 by means of the handle 48 and supply a suitable amount of a fuel oil through the supply pipe 14 to the vaporization and ignition means 12.
The oil burner according to the present invention includes a safeguard mechanism against a power stoppage, which is generally indicated by reference numeral 54 in Fig. 1. The safeguard mechanism 54 includes an air damper 56 connected to an air supply passage 57 communicated with the air supply pipe 18 and the through-holes 26 of the diffusion and ignition chamber 20. The air damper 56 is actuated in cooperation with a mechanism, to be described subsequently, for changing the flow rate of fuel oil to be supplied to the vaporization and ignition means 12 to cause high and low rates of combustion. Also, the air damper 56 has a solenoid 58 connected thereto which has a wiring for allowing the air damper 56 to be opened when the supply of an electric current to the oil burner is stopped~ The safeguard mechanism also includes an air fan 60. The air fan 60 does not ha~e a braking mechanism and is adapted to be rotated by inertia force when the supply of an electric current to the oil burner is stopped. In the embodiment illustrated, the applica-tion of inertia force ~o the air fan, as shown in Fig. 3, is accomplis~ed by a weight 62 attached to each of blades 64 of the fan, Alternatively, inertia force may be applied to the air fan by weighing the hub to which the blades are attached.
~eference numeral 66 designates a solenoid included in a mechanism for changing the 1OW rate of a fuel oil as schematically shown in Fig, 1 and detailedly shown in Fig. 2, In Fig. 2, the flow of fuel oil has been interrupted since solenoid 70 is closed~ In the embodiment illustrated, the ~low rate changing mechanism comprises a solenoi~ 66 which includes a plunger 66a which bears on a pivoted link 66b adapted to operate the shaft 52 of the flow rate controlling mechanism 40 to vary the ~low rate of fuel oil to be supplied to the vaporization and ignition means 12 between the maximum and minimum flow rates set by handle 48 for high and low rates of combustion. Also, the mechanism is constructed to be actuated in cooperation with ths air damper 56. A ramification pipe 68 is con-nected to the other end of solenoid 66 and is communica~
ted with the air supply pipe 18. A bore 66c com-municates the interior bore of solenoid 66 with air supply pipe 18. When plunger 66a of solenoid 66 retuxns to its illustrated position upon loss of power~ it - 30 sucks air ~rom air supply pipe 18 into the ramification pipe 68 to help carry out fire extinguishing when the supply of an electric current to the oil burnex is stopped.
1 ~
~~9~
Between the flow rate controlling mechanism 40 and the oil supply pipe 14, a solenoid valve mechanism 70 is disposed which has a wiring for allowing the supply of a fuel oil to the oil supply pipe 14 to be stopped when the supply of an electric current to the oil burner is stopped. The solenoid valve mechanism 70 may comprise only a solenoid valve~ Alternatively, it may comprise a solenoid-operated pump acting as a solenoid valve in cooperation with the fuel flow rate changing mechanism.
The manner of operation of the oil burner com-prising the safeguard mechanism against a power stoppage illustrated in Figs, 1 to 3 will now be explained with reference to Fig, 4 which is a circuit diagram used in the embodiment.
In Fig, 4, when a main switch 72 is closed, to the illustrated dashed line position, the solenoid valve mechanism 70 is actuated to allow fuel oil to be supplied through the oil supply pipe 14 to the vaporization and ignition means 12, and an electric current is supplied via switches 72a and 72b to an ignition heater 74 provided in the vaporization and ignition means 12 and via switch 72a to a motor 76 for operating the air fan 60 to carry out an ignition operation. When the vaporization and ignition means 12 is further increased in temperature, a th~rmostat 78 closes to the illustrated dashed line position and an electric curxent is supplied to actuate a relay 80, which changes switches 72a and 72b to their illustrated dashed line positions to thereby interrupt the supply of an electric current to the ignition heater 74, Simultaneously, the flow rate changing solenoid 66 is actuated via switches 72a and 82 to retract the solenoid plunger 66a, thus allowing shaft 52 to be pushed upward and valve 46 to be opened by its spring 46a to increase the flow rate of fuel, to thereby carry out the high or maximum com-bustion indicated by the H setting of switch 82~ Adecrease in combustion can be carried out by changing over switch 82 to its low or L setting for changing the rate of combustion, More particularly, when the switch 82 closes to the dashed line position shown in Fig. 4, an electric current is supplied to the solenoid 58, which actuates to close the air damper 56 to cause the flow of combustion air supplied to the oil burner to be decreased. Thus~ switch 82 comprises a means for selectively disconnecting solenoid 58 and solenoid 66 from electrical power to provide flow rates of fuel and air into chamber 20 to achieve low and high rates of combustion. And the supply of electric current to solenoid 66 is interrupted so that plunger 66a returns to the position shown in Fig. 2. So, valve 46 is held to its low flow position against spring 46a by shaft 52 which is forced downwardly by link 66b. In a fire extinguishing operation, the main switch 72 is opened to interrupt the supply of an electric current to the solenoid valve mechanism 70; and the supply of electric current is interrupted to solenoid 58 or solenoid 66, depending on whether switch 82 has been set to the H or L
position. Then air damper 56 will remain wide open at its H position to supply a large amount of air, while the supply of a fuel oil is interrupted to the vaporization and ignition means 12, so that the fire extinguishing may be carried out. In this instance, when the main switch 72 is opened, an electronic timer 84 is actuated to supply an electric current to the solenoid 66 of the flow rate changing mechanism, and then, the electronic timer 84 is opened in a few seconds to return the solenoid 66 to the position shown in Fig. 2. This allows plunger 66a of solenoid 66 to suck air from the air supply pipe 18 into the ramification pipe 68, to thereby rapidly carry out the fire _ g ~19~8~
extinguishing.
In the present invention constructed in the manner as mentioned above, the flow rate of air introduced into the oil burner is controlled by the air damper 56 without changing the rotational speed of the motor 7fi for actuatin~ the air fan 60, therefore, the motor can be always rotated with a high speed during the combustion operation. In addition, the air fan 60 is applied thereto an inertia force by the weight 62 and does not have any braking mechanism, this resulting in the air fan 60 being capable of keeping a sufficient air supplying capacity just after a power stoppage. Also, the solenoid 58 connected to the air damper 56 has the wiring which allows the air damper 56 to be opened when the supply of an electric current to the oil burner is interrupted, thus, it is possible to supply a large amount of air through the air damper 56 to the vaporization and ignltion means 12 when the supply of an electric current to the oil burner is reopened. The solenoid valve mechanisr 70 has the wiring which allows the supply of a fuel oil to the oil supply pipe 14 to be stopped when the supply of an electric current to the oil burner is interrupted. Further, importantly, these components are adapted to be turned-off together at a power stoppage.
Thus, it will be noted that the present invention is capable of supplying to the oil burner a combustion à~r sufficient to accomplish the complete combustion of a combustible gas remaining in the vaporization and ignition means at a power stoppage, to thereby effectively prevent soot and a smelly and toxic incomplete combustion product from being produced;
because the present invention is adapted to stop the supply of a fuel oil to decrease a flame, open the air damper to decrease the flow resistance of an air and allow the air fan to keep an air supplying capacity due to inertia force at a power stoppage.
Thus, the oil burner having the safeguard mechanism against a power stoppage incorporated therein according to the present invention can be effectively used in the interior because only a complete combustion gas is always generated.
As many apparently ~idely different embodiments of this invention may be made without departing from the spirit and scope thereof, it is to be understood that the invention is not limited to the speclfic embodiment thereof except as defined in the appended claims.
Field of the ~nVentiQn This invention relates to an oil burner com-prising a safeguard mechanism against a power stoppage and more particularly to an oil burner capable of accomplishing a fire extinguishing operation in a perfect combustion state without causing any abnormal combustion upon a power stoppage, namely, an interruption o~
electrical service.
Description o~ the Prior Art There has been conventionally known an oil burner which is adapted to vaporize a fuel oil by means of a vaporization means and to form a combustible gas from the vaporized fuel oil in the vaporization means using air supplied thereto. In such con~entional oil burner having a vaporization means, the vaporization means is not pro-vided independent from a combustion means. This results in such conventional oil burner having an important dis-advantage that it carries out an incomplete combustion to produce a large amount of soot and a smelly and/or toxic incomplete combustion product when the ~low rate o~ air supplied is varied due to, for example, the stopping of an air fan. Such disadvantage remarkably appears when the supply of an electrical current to the oil burner is abruptly interrupted due to a power stoppage. Thus, the conventional oil burner o~ such type is not suitable for use in the interior. Recently, there has been proposed an oil burner of such type which is capable of carrying out a fire extinguishing operation in a complete com-bustion while the supply o~ an electrical current to theoil burner is being continued~ However, even such oil burner is not constructed to carry out a fire extinguishing operation in a complete combustion state upon power StQppa~e.
BR~EF SUMMARY OF THE INVENTION
The present invention has been made in view of the foregoing disadvantage in the prior art.
Accordingly, it is an object of the present invention to provide ~n oil burner comprising a safeguard mechanism against a power stoppage, which is capable of carrying out a fire extinguishing operation in a complete combustion state upon a power stoppage as well, so that it does not produce any soot and any smelly and toxic incomplete combustion product.
It is another object of the present invention to provide an oil burner comprising a safeguard mechanism against a power stoppage, which is capable of effectively stopping the supply of a fuel oil upon a power stoppage to more effectively accomplish the above-mentioned object.
It is a further object of the present invention to provide an oil burner comprising a safeguard mechanism against a power stoppage, which is capable of carrying out the above-mentioned objects with a simple construction.
Accordingly, the invention is claimed herein as a liquid fuel burner having a safeguard feature against interruption of electric power, said burner comprising:
an air supply pipe; a liquid fuel supply pipe;
vaporization and ignition means connected to said air and fuel supply pipes for forming and igniting a com-bustible gas from air and liquid fuel supplied throu~h said pipes; means for connecting said burner to a supply of electric current; means for changing the flow rate of fuel through said fuel supply pipe to achieve different rates of combustion; solenoid valve means connected to said fuel supply pipe and said means for connecting for stopping the flow of fuel therethrough upon interruption of a supply of electric current to said burner; air damper means for controlling the flow of air to said air supply pipe; solenoid means connected to said air damper ~9~
means and said means ~or connecting for reducing air flow through said damper means upon connection of supply of electric current to said solenoid means and for increasing air flow through said damper means upon interruption of a supply of electric current to said solenoid means; air fan means connected to said air damper means and said means for connecting for supplying a flow of air through said air supply pipe to said vaporization and ignition means; and weight means operatively con-nected to said air fan means for causing said air fan means to continue to rotate due to inertia force upon interruption of a supply of electric current to said burner; whereby upon interruption of a supply of electric current, said solenoid valve means closes to stop the flow of fuel and said damper means opens to admit a continued flow of air to said vaporization and ignition means to complete combustion of fuel introduced prior to said interruption.
BRIEF DESCRI~TION OF`T~E`DRAWINGS
Other objects and many of the attendant advantages of the present invention will be readily appreciated as the same becomes better understood by reference to the following detailed description when considered in connection with the accompanying drawings, in which like reference numerals designate the same parts throughout the figures thereof and wherein:
Fig. 1 is a vertical sectional view showing an embodiment of an oil burner comprising a safeguard mechanism against a power stoppage according to the present invention;
Fig. 2 is a vertical sectional view showing an example of a mechanism for controlling the flow rate of a fuel oil used in the oil burner shown in Fig. l;
Fig. 3 is a partially sectional view showing an example of an air fan rotated by inertia force upon a power stoppage which forms a part of a safeguard mechanism against a power stoppage incorporated in the oil burner shown in Fig. l; and Fig. 4 is a schematic diagram of a circuit which may be employed ln the oil burner of Fig. 1.
.
DET~ILED DESCRIPTION OF THE PREFERRED EMso~IMENT
Now, an oil burner comprlsing a safeguard mechanism against a power stoppage according to the present invention will be described hereinafter with reference to the accompanying drawings.
Fig. 1 illustrates an embodiment of an oil burner 10 according to the present invention. The oil burner illustrated in Fig. 1 is a red-hot type oil space heater; however, it should be noted that the oil burner is not limited to such oil space heater.
The oil burner 10 shown in Fig. 1 is constructed in such a manner as known in the art, for a safeguard mechanism against a power stoppage incorporated therein.
The oil burner 10 includes a vaporization and ignition means 12 having a heater means (not shown) disposed therein, the heater acting to vaporize and ignite a fuel oil supplied to the means 12 through a fuel oil supply pipe 14 from a fuel oil storage tank (not shown). The vaporization and ignition means 12 has a vaporizing and igniting chamber 16 defined in a lower section thereof which is adapted to vaporize a fuel oil supplied through the supply pipe 14, mix the vaporized fuel oil with an air supplied thereto through an air supply pipe 18 from ambient atmosphere to form a combustible gas, and ignite the combustible gas by means of the heater. As illustrated, air supply pipe 1~ slopes downwardly into chamber 16 and fuel supply pipe 14 empties into air supply pipe 18; so that, fuel and air flow downwardly into chamber 16 through the end portion of pipe 18 connected to chamber 16. The ~aporization and ignition means 12 also has a flame diffusion chamber 20 defined in an upper section thereof and communicated through an opening 22 with the vaporizing and igniting chamber 16. Chamber 20 has a side wall provided with a plurality of through-holes 26 for supplying combustion air from an ambientatmosphere therethrough to the chamber 20. The flame diffusion chamber 20 is provided therein with a flame diffusion means 23 which allows the ignited combustible gas formed in the vaporizing and igniting chamber 16 and supplied to the chamber 20 through the opening 22 tG be diffused and uniformly mixed with the combustion air supplied through the through-holes 26 in the chamber 20.
The oil burner 10 also includes a combustion chamber 30 disposed above the flame diffusion chamber 20 and communicated therewith, which is adapted to burn the ignited combustible gas supplied thereto from the flame diffusion chamber 20. The combustion chamber 30 has an outer perforated combustion cylinder 32 and an inner perforated combustion cylinder 34 each formed of a ceramic material. The combustible gas supplied to the combustion chamber 30 is burned on the outer surface of the inner cylinder 34 and the both surfaces of the outer cylinder 32 to red-heat the cylinders 32 and 34. Around the outer combustion cylinder 32 is disposed a trans-parent cylinder 36 formed of heat-resistant glass through which heat rays are discharged from the com-bustion chamber 30 to the exterior of the oil burner.
Above the combustion chamber 30, an auxiliary combustion chamber 33 is disposed in communication therewith. The auxiliary combustion chamber 38 ser~es to completely burn any combustible gas which may remain in a combustion gas formed in the combustion chamber 30.
Further, the oil burner includes a mechanism 40 for controlling the flow rate of a fuel oil to be supplied to the vaporization and ignition means 12, as schematically shown in Fig. 1 and detailedly shown in Fig. 2. The fuel flow rate controlling mechanism 40 is disposed between the oil supply pipe 14 and the oil storage tank and is constructed in such a manner as known in the art. The controlling mechanism 40 includes a 10at 42, an oil level controling valve 44 connected to the 10at so as to introduce fuel oil into the mechanism 40 in cooperation with the ~loat, a valve 46 for controlling the flow rate of fuel o~l to be supplied from the mechanism 40 through the oil supply pipe 14 to the means 12, a handle 48 ~or actuating the valve 46 through a cam and follower means 50, and a shaft 52 for directly operating the cam and follower means 50.
The controlling mechanism 40 constructed as mentioned above is adapted to control the flow rate of a fuel oil by actuating the valve 46 through the cam and follower means 50 by means of the handle 48 and supply a suitable amount of a fuel oil through the supply pipe 14 to the vaporization and ignition means 12.
The oil burner according to the present invention includes a safeguard mechanism against a power stoppage, which is generally indicated by reference numeral 54 in Fig. 1. The safeguard mechanism 54 includes an air damper 56 connected to an air supply passage 57 communicated with the air supply pipe 18 and the through-holes 26 of the diffusion and ignition chamber 20. The air damper 56 is actuated in cooperation with a mechanism, to be described subsequently, for changing the flow rate of fuel oil to be supplied to the vaporization and ignition means 12 to cause high and low rates of combustion. Also, the air damper 56 has a solenoid 58 connected thereto which has a wiring for allowing the air damper 56 to be opened when the supply of an electric current to the oil burner is stopped~ The safeguard mechanism also includes an air fan 60. The air fan 60 does not ha~e a braking mechanism and is adapted to be rotated by inertia force when the supply of an electric current to the oil burner is stopped. In the embodiment illustrated, the applica-tion of inertia force ~o the air fan, as shown in Fig. 3, is accomplis~ed by a weight 62 attached to each of blades 64 of the fan, Alternatively, inertia force may be applied to the air fan by weighing the hub to which the blades are attached.
~eference numeral 66 designates a solenoid included in a mechanism for changing the 1OW rate of a fuel oil as schematically shown in Fig, 1 and detailedly shown in Fig. 2, In Fig. 2, the flow of fuel oil has been interrupted since solenoid 70 is closed~ In the embodiment illustrated, the ~low rate changing mechanism comprises a solenoi~ 66 which includes a plunger 66a which bears on a pivoted link 66b adapted to operate the shaft 52 of the flow rate controlling mechanism 40 to vary the ~low rate of fuel oil to be supplied to the vaporization and ignition means 12 between the maximum and minimum flow rates set by handle 48 for high and low rates of combustion. Also, the mechanism is constructed to be actuated in cooperation with ths air damper 56. A ramification pipe 68 is con-nected to the other end of solenoid 66 and is communica~
ted with the air supply pipe 18. A bore 66c com-municates the interior bore of solenoid 66 with air supply pipe 18. When plunger 66a of solenoid 66 retuxns to its illustrated position upon loss of power~ it - 30 sucks air ~rom air supply pipe 18 into the ramification pipe 68 to help carry out fire extinguishing when the supply of an electric current to the oil burnex is stopped.
1 ~
~~9~
Between the flow rate controlling mechanism 40 and the oil supply pipe 14, a solenoid valve mechanism 70 is disposed which has a wiring for allowing the supply of a fuel oil to the oil supply pipe 14 to be stopped when the supply of an electric current to the oil burner is stopped. The solenoid valve mechanism 70 may comprise only a solenoid valve~ Alternatively, it may comprise a solenoid-operated pump acting as a solenoid valve in cooperation with the fuel flow rate changing mechanism.
The manner of operation of the oil burner com-prising the safeguard mechanism against a power stoppage illustrated in Figs, 1 to 3 will now be explained with reference to Fig, 4 which is a circuit diagram used in the embodiment.
In Fig, 4, when a main switch 72 is closed, to the illustrated dashed line position, the solenoid valve mechanism 70 is actuated to allow fuel oil to be supplied through the oil supply pipe 14 to the vaporization and ignition means 12, and an electric current is supplied via switches 72a and 72b to an ignition heater 74 provided in the vaporization and ignition means 12 and via switch 72a to a motor 76 for operating the air fan 60 to carry out an ignition operation. When the vaporization and ignition means 12 is further increased in temperature, a th~rmostat 78 closes to the illustrated dashed line position and an electric curxent is supplied to actuate a relay 80, which changes switches 72a and 72b to their illustrated dashed line positions to thereby interrupt the supply of an electric current to the ignition heater 74, Simultaneously, the flow rate changing solenoid 66 is actuated via switches 72a and 82 to retract the solenoid plunger 66a, thus allowing shaft 52 to be pushed upward and valve 46 to be opened by its spring 46a to increase the flow rate of fuel, to thereby carry out the high or maximum com-bustion indicated by the H setting of switch 82~ Adecrease in combustion can be carried out by changing over switch 82 to its low or L setting for changing the rate of combustion, More particularly, when the switch 82 closes to the dashed line position shown in Fig. 4, an electric current is supplied to the solenoid 58, which actuates to close the air damper 56 to cause the flow of combustion air supplied to the oil burner to be decreased. Thus~ switch 82 comprises a means for selectively disconnecting solenoid 58 and solenoid 66 from electrical power to provide flow rates of fuel and air into chamber 20 to achieve low and high rates of combustion. And the supply of electric current to solenoid 66 is interrupted so that plunger 66a returns to the position shown in Fig. 2. So, valve 46 is held to its low flow position against spring 46a by shaft 52 which is forced downwardly by link 66b. In a fire extinguishing operation, the main switch 72 is opened to interrupt the supply of an electric current to the solenoid valve mechanism 70; and the supply of electric current is interrupted to solenoid 58 or solenoid 66, depending on whether switch 82 has been set to the H or L
position. Then air damper 56 will remain wide open at its H position to supply a large amount of air, while the supply of a fuel oil is interrupted to the vaporization and ignition means 12, so that the fire extinguishing may be carried out. In this instance, when the main switch 72 is opened, an electronic timer 84 is actuated to supply an electric current to the solenoid 66 of the flow rate changing mechanism, and then, the electronic timer 84 is opened in a few seconds to return the solenoid 66 to the position shown in Fig. 2. This allows plunger 66a of solenoid 66 to suck air from the air supply pipe 18 into the ramification pipe 68, to thereby rapidly carry out the fire _ g ~19~8~
extinguishing.
In the present invention constructed in the manner as mentioned above, the flow rate of air introduced into the oil burner is controlled by the air damper 56 without changing the rotational speed of the motor 7fi for actuatin~ the air fan 60, therefore, the motor can be always rotated with a high speed during the combustion operation. In addition, the air fan 60 is applied thereto an inertia force by the weight 62 and does not have any braking mechanism, this resulting in the air fan 60 being capable of keeping a sufficient air supplying capacity just after a power stoppage. Also, the solenoid 58 connected to the air damper 56 has the wiring which allows the air damper 56 to be opened when the supply of an electric current to the oil burner is interrupted, thus, it is possible to supply a large amount of air through the air damper 56 to the vaporization and ignltion means 12 when the supply of an electric current to the oil burner is reopened. The solenoid valve mechanisr 70 has the wiring which allows the supply of a fuel oil to the oil supply pipe 14 to be stopped when the supply of an electric current to the oil burner is interrupted. Further, importantly, these components are adapted to be turned-off together at a power stoppage.
Thus, it will be noted that the present invention is capable of supplying to the oil burner a combustion à~r sufficient to accomplish the complete combustion of a combustible gas remaining in the vaporization and ignition means at a power stoppage, to thereby effectively prevent soot and a smelly and toxic incomplete combustion product from being produced;
because the present invention is adapted to stop the supply of a fuel oil to decrease a flame, open the air damper to decrease the flow resistance of an air and allow the air fan to keep an air supplying capacity due to inertia force at a power stoppage.
Thus, the oil burner having the safeguard mechanism against a power stoppage incorporated therein according to the present invention can be effectively used in the interior because only a complete combustion gas is always generated.
As many apparently ~idely different embodiments of this invention may be made without departing from the spirit and scope thereof, it is to be understood that the invention is not limited to the speclfic embodiment thereof except as defined in the appended claims.
Claims (10)
1. A liquid fuel burner having a safeguard feature against interruption of electric power, said burner comprising:
an air supply pipe;
a liquid fuel supply pipe;
vaporization and ignition means connected to said air and fuel supply pipes for forming and igniting a combustible gas from air and liquid fuel supplied through said pipes;
means for connecting said burner to a supply of electric current;
means for changing the flow rate of fuel through said fuel supply pipe to achieve different rates of com-bustion;
solenoid valve means connected to said fuel supply pipe and said means for connecting for stopping the flow of fuel therethrough upon interruption of a supply of electric current to said burner;
air damper means for controlling the flow of air to said air supply pipe;
solenoid means connected to said air damper means and said means for connecting for reducing air flow through said damper means upon connection of supply of electric current to said solenoid means and for increasing air flow through said damper means upon interruption of a supply of electric current to said solenoid means;
air fan means connected to said air damper means and said means for connecting for supplying a flow of air through said air supply pipe to said vaporization and ignition means; and weight means operatively connected to said air fan means for causing said air fan means to continue to rotate due to inertia force upon interruption of a supply of electric current to said burner;
whereby upon interruption of a supply of electric current, said solenoid valve means closes to stop the flow of fuel and said damper means opens to admit a continued flow of air to said vaporization and ignition means to complete combustion of fuel introduced prior to said interruption.
an air supply pipe;
a liquid fuel supply pipe;
vaporization and ignition means connected to said air and fuel supply pipes for forming and igniting a combustible gas from air and liquid fuel supplied through said pipes;
means for connecting said burner to a supply of electric current;
means for changing the flow rate of fuel through said fuel supply pipe to achieve different rates of com-bustion;
solenoid valve means connected to said fuel supply pipe and said means for connecting for stopping the flow of fuel therethrough upon interruption of a supply of electric current to said burner;
air damper means for controlling the flow of air to said air supply pipe;
solenoid means connected to said air damper means and said means for connecting for reducing air flow through said damper means upon connection of supply of electric current to said solenoid means and for increasing air flow through said damper means upon interruption of a supply of electric current to said solenoid means;
air fan means connected to said air damper means and said means for connecting for supplying a flow of air through said air supply pipe to said vaporization and ignition means; and weight means operatively connected to said air fan means for causing said air fan means to continue to rotate due to inertia force upon interruption of a supply of electric current to said burner;
whereby upon interruption of a supply of electric current, said solenoid valve means closes to stop the flow of fuel and said damper means opens to admit a continued flow of air to said vaporization and ignition means to complete combustion of fuel introduced prior to said interruption.
2. A burner according to claim 1, wherein said fuel supply pipe slopes downwardly to said vaporization and ignition means.
3. A burner according to claim 1, further com-prising means for selectively disconnecting said solenoid means from said means for connecting and for activating said means for changing, to provide flow rates of fuel and air to said vaporization and ignition means to achieve said different rates of combustion.
4. A burner according to claim 1, wherein said fuel supply pipe is connected to said air supply pipe and said air supply pipe slopes downwardly between the portion thereof connected to said fuel supply pipe and the end thereof connected to said vaporization and ignition means; further comprising means actuated by said means for changing the flow rate of fuel, for applying suction to said air supply pipe to aid in extinguishing fire upon interruption of a supply of electric current to said burner.
5. A burner according to claim 4, wherein, said means for changing the flow rate of fuel comprises a further solenoid having an interior bore and a plunger mounted to move within said interior bore upon actuation of said further solenoid; and said means for applying suction comprises a ramification pipe connected between said air supply pipe and said interior bore, whereby movement of said plunger creates suction in said ramification pipe.
6. A burner according to claim 5, further comprising means for controlling the flow of fuel to said fuel supply pipe at a portion of said oil supply pipe upstream of said solenoid valve means, wherein said further solenoid of said means for changing acts on said means for controlling to achieve said different rates of combustion.
7. An oil burner having a safeguard feature against interruption of electric power, said burner com-prising:
a vaporization and ignition means for vaporizing liquid fuel supplied thereto, for forming a combustible gas from vaporized fuel and air supplied thereto and for igniting said combustible gas;
a liquid fuel supply pipe and an air supply pipe connected to said vaporization and ignition means, said fuel supply pipe being connected through said air supply pipe to said vaporization and ignition means, said air supply pipe being downwardly sloped between the portion thereof connected with said fuel supply pipe and the end portion thereof connected to said vaporization and ignition means;
means for changing the flow rate of fuel supplied to said fuel supply pipe, said means for changing being connected to said fuel supply pipe;
means actuated by said means for changing the flow rate of fuel, for applying suction to said air supply pipe to aid in extinguishing fire upon inter-ruption of a supply of electric current to said burner;
solenoid valve means connected to said fuel supply pipe and said means for connecting for stopping the flow of fuel therethrough upon interruption of a supply of electric current to said burner;
air damper means for controlling the flow of air to said air supply pipe;
solenoid means connected to said air damper means for reducing air flow through said damper means upon connection of a supply of electric current to said solenoid means and for increasing air flow through said damper means upon interruption of a supply of electrical current to said solenoid means; and air flow means connected to said air damper means and said means for connecting for supplying a flow of air through air supply pipe to said vaporization and ignition means;
weight means operatively connected to said air flow means for causing said air flow means to continue to rotate due to inertia force upon interruption of a supply of electric current to said burner;
whereby upon interruption of a supply of electric current, said solenoid valve means closes to stop the flow of fuel and said damper means opens to admit a continued flow of air to said vaporization and ignition means to complete combustion of fuel introduced prior to said interruption.
a vaporization and ignition means for vaporizing liquid fuel supplied thereto, for forming a combustible gas from vaporized fuel and air supplied thereto and for igniting said combustible gas;
a liquid fuel supply pipe and an air supply pipe connected to said vaporization and ignition means, said fuel supply pipe being connected through said air supply pipe to said vaporization and ignition means, said air supply pipe being downwardly sloped between the portion thereof connected with said fuel supply pipe and the end portion thereof connected to said vaporization and ignition means;
means for changing the flow rate of fuel supplied to said fuel supply pipe, said means for changing being connected to said fuel supply pipe;
means actuated by said means for changing the flow rate of fuel, for applying suction to said air supply pipe to aid in extinguishing fire upon inter-ruption of a supply of electric current to said burner;
solenoid valve means connected to said fuel supply pipe and said means for connecting for stopping the flow of fuel therethrough upon interruption of a supply of electric current to said burner;
air damper means for controlling the flow of air to said air supply pipe;
solenoid means connected to said air damper means for reducing air flow through said damper means upon connection of a supply of electric current to said solenoid means and for increasing air flow through said damper means upon interruption of a supply of electrical current to said solenoid means; and air flow means connected to said air damper means and said means for connecting for supplying a flow of air through air supply pipe to said vaporization and ignition means;
weight means operatively connected to said air flow means for causing said air flow means to continue to rotate due to inertia force upon interruption of a supply of electric current to said burner;
whereby upon interruption of a supply of electric current, said solenoid valve means closes to stop the flow of fuel and said damper means opens to admit a continued flow of air to said vaporization and ignition means to complete combustion of fuel introduced prior to said interruption.
8. A burner according to claim 7, further comprising means for selectively disconnecting said solenoid means from said means for connecting and for actuating said means for changing, to provide flow rates of fuel and air to said vaporization and ignition means to achieve said different rates of combustion.
9. A burner according to claim 8, wherein said means for changing the flow rate of fuel comprises a further solenoid having an interior bore and a plunger mounted to move within said interior bore upon activation of said further solenoid; and said means for applying suction comprises a ramification pipe connected between said air supply pipe and said interior bore, whereby movement of said plunger creates suction in said ramification pipe.
10. A burner according to claim 9, further comprising means for controlling the flow of fuel to said fuel supply pipe at a portion of said oil supply pipe upstream of said solenoid valve means; wherein said further solenoid of said means for changing acts on said means for controlling to achieve said different rates of combustion.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP166251/1981 | 1981-10-16 | ||
| JP56166251A JPS5866718A (en) | 1981-10-16 | 1981-10-16 | Oil stove with safety device for power failure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1198980A true CA1198980A (en) | 1986-01-07 |
Family
ID=15827914
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000413417A Expired CA1198980A (en) | 1981-10-16 | 1982-10-14 | Liquid fuel burner having a saveguard feature against interruption of electric power |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US4544349A (en) |
| JP (1) | JPS5866718A (en) |
| CA (1) | CA1198980A (en) |
| GB (1) | GB2108259B (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4688546A (en) * | 1984-01-30 | 1987-08-25 | Sharp Kabushiki Kaisha | Deodorizing device for oil stove |
| US6835062B2 (en) * | 2001-12-14 | 2004-12-28 | Suntec Industries Incorporated | Fuel oil supply circuit for an oil burner having a solenoid valve in parallel circuit with diaphragm valve for controlling oil flow at start up |
| US6929465B1 (en) * | 2002-02-04 | 2005-08-16 | R. W. Beckett Corporation | Timer circuit for valve activation in oil burner system |
| US6767955B2 (en) * | 2002-05-08 | 2004-07-27 | Pentron Clinical Technologies | Flowable dental resin materials and method of use thereof |
| TWM250055U (en) * | 2003-06-06 | 2004-11-11 | Rung-Chang Peng | Inertial structure design for fan |
| US7177199B2 (en) * | 2003-10-20 | 2007-02-13 | Sandisk Corporation | Behavior based programming of non-volatile memory |
Family Cites Families (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3236282A (en) * | 1966-02-22 | Burner control | ||
| US2100673A (en) * | 1937-11-30 | Device fob the combined control of | ||
| US1782668A (en) * | 1929-09-21 | 1930-11-25 | Franklin Oil Heating Inc | Oil burner |
| US1853345A (en) * | 1931-07-17 | 1932-04-12 | Franklin Oil Heating Inc | Oil burning apparatus |
| US2255318A (en) * | 1939-08-21 | 1941-09-09 | Mechanical Products Mfg Compan | Control apparatus for oil burners |
| US2267187A (en) * | 1940-03-25 | 1941-12-23 | Bock Corp | Control apparatus |
| US2424754A (en) * | 1942-07-29 | 1947-07-29 | Stewart Warner Corp | Fuel feeding system with combined valve and air vent |
| US2445466A (en) * | 1944-06-02 | 1948-07-20 | Solar Aircraft Co | Fluid fuel combustion device |
| GB980365A (en) * | 1962-12-06 | 1965-01-13 | Cochran And Company Annan Ltd | Control of fuel and air supply to burners |
| US3299940A (en) * | 1963-06-22 | 1967-01-24 | American Smelting Refining | Burner structure |
| JPS4742024Y1 (en) * | 1970-09-14 | 1972-12-19 | ||
| JPS4931840Y2 (en) * | 1971-03-13 | 1974-08-28 | ||
| US4118172A (en) * | 1976-10-20 | 1978-10-03 | Battelle Development Corporation | Method and apparatus for controlling burner stoichiometry |
| JPS6014122Y2 (en) * | 1978-03-08 | 1985-05-07 | 松下電器産業株式会社 | gas water heater |
| JPS54141038U (en) * | 1978-03-24 | 1979-10-01 |
-
1981
- 1981-10-16 JP JP56166251A patent/JPS5866718A/en active Pending
-
1982
- 1982-10-11 GB GB08229021A patent/GB2108259B/en not_active Expired
- 1982-10-14 CA CA000413417A patent/CA1198980A/en not_active Expired
- 1982-10-15 US US06/434,449 patent/US4544349A/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| US4544349A (en) | 1985-10-01 |
| GB2108259B (en) | 1985-05-22 |
| GB2108259A (en) | 1983-05-11 |
| JPS5866718A (en) | 1983-04-21 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |