US 3723707 A
A humidifier having automatic control means respective to the degree of moisture in the air of the space to be humidified is provided with a hygrostatic switch located directly on the humidifier, thus dispensing with wiring connections between the humidifier and a hygrostatic switch located at a distance therefrom. A current of air from the space to be humidified is drawn past the hygrostatic switch as a convection current caused by disposing the air inlet, into an outer casing surrounding a cold water container and a heated water container, at a point adjacent the cold water container and disposing the air outlet at a point distant from the air inlet and adjacent the heated water container.
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Description (OCR text may contain errors)
United States Patent [191 Wunderlin [451 Mar. 27, 1973 1 HUMIDIFIER Max Wunderlin, Mannedorf, Switzerland  Inventor:
 Assignee: Turmix AG, Kusnacht, Switzerland  Filed: Aug. 20, 1971 21 Appl. No.: 173,461
 US. Cl. ..2l9/276, 219/314, 219/332, 219/362, 219/363, 319/386, 219/518,
261/DIG. 34, 261/D1G. 65
 Int. Cl ..F22b 1/28  Field of Search ..219/271, 272, 276, 314, 332, 219/362, 363, 366, 385, 386, 518; 261/DIG.
34, DIG. 46, DIG. 65, 129, 139, 142; 236/44  References Cited UNITED STATES PATENTS Garofalow et a1. ..126/l13 X 9/1948 Smith ..219/518 4/1967 Carlbergetal ..219/518 Primary Examiner-C. L. Albritton Attorney-Harold F. Watson  ABSTRACT A humidifier having automatic control means respective to the degree of moisture in the air of the space to be humidified is provided with a hygrostatic switch located directly on the humidifier, thus dispensing with wiring connections between the humidifier and a hygrostatic switch located at a distance therefrom. A current of air from the space to be humidified is drawn past the hygrostatic switch as a convection current caused by disposing the air inlet, into an outer casing surrounding a cold water container and a heated water container, at a point adjacent the cold water container and disposing the air outlet at a point distant from the air inlet and adjacent the heated water container.
5 Claims, 1 Drawing Figure HUMIDIFIER CROSS REFERENCES TO RELATED APPLICATIONS Applicant claims priority from corresponding Austrian Pat. application No. 9 A 7631/70, filed Aug. 21, 1970.
BACKGROUND OF THE INVENTION Field of the Invention For humidifying of the air in homes and offices, various types of known air humidifiers are used nowadays, in which water is either atomized, evaporated or vaporized. If it is desired to have automatic control of the moisture in the room, then a hygrostatic switch, required for this purpose, must be arranged at some distance from the humidifier so that it will be exposed to the actual moisture values in the room, and it must be connected by cables with the heating arrangement of the humidifier. Since in the case of known humidifiers the air around them is not or is only insufficiently circulated, a hygrostatic switch disposed directly on the humidifier would respond to the immediate moisture and temperature around the device, which do not correspond to the actual conditions inside the whole room.
SUMMARY OF THE INVENTION The invention consists in providing a humidifier with automatic control of moisture with a hygrostatic switch so located that no cable connection to the humidifier will be required. This objective can be achieved by using a humidifier already known, with a container subdivided into two communicating spaces, the heating arrangement being disposed in the smaller space and a supply of cold water in the larger space, so that the container will have a hot and a cold zone, and if one utilizes the convection current occurring between two air spaces in the case of a temperature difference, for the purpose of bringing the air in the room, which is to be measured in regard to its moisture value, by means of ejector action to a hygrostatic switch disposed on the humidifier.
To achieve this, the humidifier, with a container subdivided into two communicating spaces and intended for the reception of the water that is to be evaporated by means of a heating arrangement disposed in the one space, according to the invention is characterized by the fact that the container is surrounded by a housing, part of which is spaced at a distance from the container, and the areas of the container and housing spaced at a distance one from the other define an air path which connects an air inlet, provided in the housing adjacent to the cold water space, with an air outlet provided in the housing adjacent to the hot water space, and in the air path and close to the air inlet a hygrostatic switch acted upon by the air, streaming in from the outside because of the convection, has been disposed. The convection current is optimal whenever the air inlet and the air outlet openings are provided in the housing at those places having the largest temperature difference. When, in a preferred embodiment of the humidifier, the container has a rectangular outline and its two communicating spaces are located one beside the other, then effectively the air inlet and the air outlet openings are provided in the housing at opposite sides of the container and at those locations which, in each case, are the farthest distant from the separating wall between the two spaces, so that there will be either no, or the least possible, heat conduction from the hot water space to the cold water space. One or more insulating walls are provided as separating walls for practical purposes between these two cpaces, and in the same way the cold water space of the container can be effectively separated by an insulating wall from the adjoining air space, and the hygrostatic switch close to the air opening disposed in said air space.
BRIEF DESCRIPTION OF THE DRAWING Further characteristics, details and advantages of the invention will be apparent from the description which follows in conjunction with the drawing, in which FIG. 1 diagrammatically illustrates an embodiment of the invention purely by way of example.
DESCRIPTION OF THE PREFERRED EMBODIMENTS The humidifier has a tank 10 for the reception of the water that is to be evaporated and which is subdivided by means of a separating wall 1 1, with an insulation 12, into two communicating spaces 13 and 14, the connection of the communicating spaces being formed by a channel in the shape of a hose or pipe 15. The heating arrangement in the form of a cartridge 16 is disposed in the smaller space 13. The steam emerges at the top from an opening 17 from the space 13 containing the water that is to be evaporated, in order to humidify the air in the room or office. The larger cold water space 14 has an upper filling opening 18 for filling it with water. The wall of the cold water space 14, opposite the adjacent hot water space 13, has been equipped with an insulation 19 forming the wall.
The entire container 10 comprising both spaces 13 and 14 surrounded by a housing 20, at least a part of which is spaced from the container and the housing, spaced one from the other, define an air path 21, which connects an air inlet opening 22, provided in the housing adjacent to the cold water space 14, with an air outlet opening 23 provided in the housing 20 adjacent to the hot water space 13. In order to form the air path leading from one side of the humidifier to the opposite side of it, the housing must not be widely spaced from the entire outside surface of the container, but a certain zone extending along the entire container from one side to the other will be sufficient, in which the air-path is formed as a result of this spacing of the container from the housing. Near the inlet opening 22 for the air, a hybrostatic switch 24 has been disposed in the air path 21, that is to say, between the container and the housing, which can be operated from the outside with an adjusting knob 25.
Since the air in the air space 21, heated by the hot water space 13, escapes through the air outlet opening, air from the room will be sucked in through the air inlet opening 22 and flow around the hygrostatic switch disposed below said opening, so that the latter will be capable of control based on the actual moisture values inside the living space. So that at least a slight convection current will be maintained in air space 21 whenever the desired value of the moisture has been achieved in the living space, the heating arrangement can be automatically switched over to a reduced heating performance, so that the hot water space will transmit sufficient radiant heat to the air space below the air exit opening.
The humidifier stands on several legs 30 and an additional leg 31, which has been developed as a switch counteracting, by way of spring action, the weight of the water in the container, which switch automatically interrupts the supply of current to the heating device upon reaching a minimum water level in the container and in consequence of the release of the spring occurring thereby. In order to transport the humidifier, the two air inlet and air outlet openings are developed and dimensioned on the upper edge in such a way as to provide hand holds.
I. A humidifier comprising a container having two communicating chambers, a heating device mounted in one chamber for vaporizing water supplied to said chamber from the second chamber disposed side by side to said one chamber and including cold water, a housing surrounding the container so as to form an air channel between the housing and the container extending across opposite side walls and the bottom wall of the container, the housing having an air inlet opening adjacent to the cold water chamber and an air outlet opening therein adjacent said chamber for vaporizing water, said inlet opening and outlet opening being connected by said air channel, the ends to the air channel being of different temperature and due to convection causing a flow of air from the exterior into the channel and through the channel, and a hygrostatic switch mounted in the air channel adjacent said air inlet opening and acted upon by the flow of air from the exterior, so as to control the heating device upon the humidity of the surrounding air decreasing below or increasing above a predetermined value.
2. A humidifier according to claim 1, characterized in that the communicating chambers of the container are separated by at least one separating wall of insulating material.
3. A humidifier according to claim 1, characterized in that the cold water chamber of the container is separated from the adjacent air channel and the hygrostatic switch at the air inlet opening by a separating wall of insulating material.
4. Humidifier according to claim 1, characterized in that the air inlet and the air outlet openings are located in the housing close to its upper edge and are of a size suitable to form hand holds in order to carry the humidifier.
5. A humidifier according to claim 1, characterized in that upon reaching an intended value for the moisture, the hygrostatic switch will switch the heating device to a reduced heating performance in order to maintain a convection current.
UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent No. 3,723,707 Dated Mirch 27, 1973 Inventor(s) Max Wunderlin It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:
FOREIGN APPLICATION PRIORITY DATA  August 21, 1970 Austria 9 A 7631/70 Signed and sealed this 16th day of April 197M.
EDWARD MJ LETCHERJR. G. MARSHALL DANN Attesting Officer Commissioner of Patents ORM P0405) (10-59) uscoMM-oc come-ps9 Q U. 5. GOVERNMENT PRINTING OFFICE 7 I", 0"!6'33,
UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent No. 3,723,707 Dated March 27, 1973 Inv Max Wunderlin It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:
FOREIGN APPLICATION PRIORITY DATA  August 21, 1970 Austria 9 A 7631/70 Signed and sealed this 16th day of April 19%..
EDWARD M.FLETCIIER ,JR C MARSHALL DANN Attesting Officer Commissionerof Patents ORM PO-1050 (10-69) USCOMM-DC 60376-P69 A U.5. GOVERNMENT PRINTING OFFICE I989 O-l66-33l,