US 2033838 A
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Description (OCR text may contain errors)
March l0, 1936. E. J. LATTNR 2,033,838
FLUID FUEL BURNER Y Original Filed Nov. l2, 1932 /NI/ENTOK Patented Mar. 10, 1936 N N UNITED STATES PATENT OFFICE i FLUID FUEL BURNER Emert J. manner, cedar naples, iowa Original application November 12, 1932,\ lSerial No. 642,441. Divided and this application May 17, 1933, Serial N0. 671,536
4 claims. (ci. 15s-rsi' This invention relates to fluid fuel burners and particularly to that type of burner using such liquid fuel as distillate, fuel oil, kerosene, or the like and in which the oil is atomized and mixed with a blast of'air delivered into the furnace by I suitable air circulating means.
at a fairly high velocity is delivered. Means are provided for igniting the mixture, and such means are usually in the form of ignition points across which an electrical spark is caused to jump continuously by means of a high potential transformer 'or other source of high potential current. The burners are usually mounted by means of a suitable` base upon the floor or any other suitable foundationin front of the furnace with the blast conduit projecting into the furnace.
In burners of the above general character, difculty'has arisen in the devices of the prior art by reason of the failure of the ignition devices. oftentimes failure of theignition devices is traceable to the transformer Aand transformer leads which furnish high potential currents to the ignition points. The transformer terminals of the devices of the prior art were located on the outside of the transformer box or housing and the leads passed through the wall of the blast tube to the ignition points. I'he transformer terminals became dirty and, by reason of the moisture in the air inthe basement or other room in which the burner was located, breakdown at the terminals or at the point where the leads passed through the blast tube occurred. Furthermore, the exposed terminals a'orded a means whereby a person might be severely shocked bythe high tension current, and the terminals and leads constituted unsightly projections on the transformer housing and on the burner.
I have devised means for overcoming the difficulties abovementioned and it is a general object of my invention to provide a new and improved oil burner and oil burner ignition means.
A more specific object of my invention is to provide an improved ignition system for oil burners of the above description.
Other and further features and objects of the invention will be more apparent to those skilled in the art upon a consideration of the accompanying drawing and following specification, wherein is disclosed an exemplary embodiment of the invention, with the understanding, however, that such changes may be'made therein asfall within the scope of the appended claims without departing from the spirit of the invention. The 5 devices may be used or adapted for use for other purposes,
In the drawing:
Figure 1 is a top plan view partly in section of a burner constructed according to one embodiment of my invention. Portions of the structure have been broken away in order to show the re-` maining parts to greater advantage, and
Figure 2 is an elevational view, taken from the left side, of the device lshown in Figure 1. In this view also portions of the structure have been broken away in order to show the parts of the device to greater advantage.
While the constructionof the burner itself is not the object of the present invention except in its connection with the ignition means, a brief description of the burner construction will be of assistance in explaininghow the ignition system is applied to the burner.
Referring now to the drawing, the burner structurev as a whole is mounted upon a base I0 which may be secured to the floor or other suitable foundation by means of bolts II. A standard I2 projects vertically from the base Inrand affords a means whereby the fan housing I3, which acts also as a main frame member, may be mounted upon the base. Since the housing I3 constitutes a passageway for air, the housing i3 may also beconsidered generally as a part of the blast tube hereinafter described.
'Ihe box-like housing I 3 is provided with a U- shaped bracket member Il at the rear wall thereof and a cylindrical resilient member I5, preferably of rubber or the like, is disposed on the standard I2 at a distance from the base of the standard such that when the `bracket I4 is clamped on the member i 5 of the standard I2, by means of the clamp I6 and bolts I1, ,the burner will be properly spaced from the oor.
A driving motor I8 of any usual construction is bolted to the left side of the housing I 3 by means of bolts I9. 'I'he shaft of the motor projects into the housing i3 and a fan 20 for. drawing air in through the louvered end bell 33 and for driving it into and through the blast conduit 26, is mounted on the end of the motor shaft.v The rotating parts of the fuel pump 43 are also driven by the shaft of the motor I8. Any suitable fan and fuel pump may be employed.
The pump 43 is supported on a flanged outer enters the fuel flow control systemthrough the conduit l1, passes through the filter 48, is pumped under pressure into the ilow control valve l1 by means of the pump I8, then into the burner fuel supply conduit 1l, and then issues from the burner nozzle 2l at the outer end of the blast conduit 28.
'I'he transformer 4fofr furnishing high tension current for ignition purposes is mounted in a casing ll disposed on top of the frame housing I3.
Low tension current is supplied to the transformer by means of conductors in a conduit 81 leading from the terminal box 86 in which electrical conductors for energizing the motor also terminate. It is the suual practice for the terminals of the transformer to be located on the side of the transformer case I4 and for theleads to pass through suitable insulators in the wall of the blast conduit and to the electrodes 8l and 82. The exposed terminals are a source of trouble and danger in that they are likely to become dirty and cause short circuits. It is quite possible that a person accidentally touching the burner while it is in operation may be badly shocked by these exposed electrodes. 'I'he junction point where the leads enter the blast conduit is also a source of difficulty in that short circuits and the like are likely to occur at this point also. In addition, the electrlcal protection necessary in the form of extra insulation is expensive. I have accordingly devised a means whereby the high tension connections are all enclosed within the blast conduit.
In a preferred construction I provide an opening 88 in the front portion of the upper wall of the frame housing I3, and arrange the terminals 89 of the transformer 84 so that they project from the bottom' thereof. When the transformer is located on top of the frame member I3 the terminals 89 project through the opening 88 and into the interior of the housing I3. The conductors 8|, which are connected to the electrodes 8l and 82, pass directly back through the corrugated portion of the blast conduit 26 to the terminals 89, where they are electrically connected with the transformer.
It is apparent that with this construction the high tension electrical leads are entirely enclosed within the blast conduit from the point where they issue from the transformer up to and including the electrodes themselves and that by this construction the possibility of short circuiting or other breakdown of the insulation of the conductors and the electrodes is minimized. Furthermore the necessity of insulation of the leads as they pass throughthe walls of the blast conduit is eliminated, thus making a less expensive structme.
Although this invention has been described in connection with certain specinc embodiments, the principles involved are susceptible of numerous other applications that willv readily occur to persons skilled in the art. The invention is, therefore, to be limited only as indicated by the scope of the appended claims. l v
I claim as' my invention:
1. In a liquid fuel burner. a blast conduit and a transformer mounted on the outer wall of the blast conduit and having the high potential terminalsy and insulators' thereof projecting into the blast conduit, the transformer being mounted outside the blast conduit where it does not interfere with the i'low of air through the conduit but with the'terminals and insulators extending within said conduit so that only one pair of insulators is required both for the transformer and for insulating the terminals from the wall of the blast conduit.
2. In a liquid fuel burner, a blast conduit and a transformer mounted on the outer wall of the blast conduit and havingthe high potential terminals and insulators thereof projecting into the blast conduit, the transformer being mounted outside the blast conduit where it does not interfere with the flow of air through the conduit but with the terminals and insulators extending witnin said conduit so that only one pair of insulators is required both for the transformer and for insulating the terminals from the wail of the blast conduit, and a blower in the blast conduit with the revolving blades thereof adjacent the outer ends of the insulators whereby the latter are kept clean by the rush of air from the blades of the i' 1 blower.
3. In a liquid fuel burner, a blast conduit, a. blower mounted within the conduit below the central longitudinal axis thereof, and a transformer mounted on the outer wall of the blast conduit above the longitudinal axis thereof and having 'the terminals thereof projecting through the bottom of the transformer and directly within the blast conduit whereby the use of high tension conductors exterior to the conduit is avoided.
4. In an oil burner including a blast tube and electrodes, a transformer mounted on the outside of the blast tube and having an opening in the wall thereof which is adjacent the blast tube, the blast tube having an opening therein communicating with the opening in the transformer,
thetransformer coil through the insulator directly into the blast tube and being extended therethrough to an electrode whereby the use of high tension conductors exterior to the conduit is avoided.
EMERT J. LAI'I'NER..