Encapsulation of components and a low energy circuit for hazardous locations
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
H02H-007/20
H01H-009/04
F25B-031/00
H01H-035/26
H01H-037/04
출원번호
US-0488150
(2014-09-16)
등록번호
US-9559517
(2017-01-31)
발명자
/ 주소
Stammer, Scott Dean
Her, La
Martin, William
출원인 / 주소
Hoffman Enclosures, Inc.
대리인 / 주소
Quarles & Brady LLP
인용정보
피인용 횟수 :
0인용 특허 :
15
초록▼
Embodiments of the disclosure provide an encapsulated compressor overload, an encapsulated compressor relay start, an encapsulated head pressure control switch and a wiring diagram for a circuit for air conditioning units which prevent gases from being ignited by means of encapsulating sparking comp
Embodiments of the disclosure provide an encapsulated compressor overload, an encapsulated compressor relay start, an encapsulated head pressure control switch and a wiring diagram for a circuit for air conditioning units which prevent gases from being ignited by means of encapsulating sparking components, use of solid-state switching devices, and/or wiring circuits in such a way that open contacts do not contain enough energy to produce a spark capable of igniting the atmosphere.
대표청구항▼
1. An encapsulated compressor overload for use with air conditioning or refrigeration systems in a hazardous location where flammable gases or vapors may exist, the encapsulated compressor overload comprising: a compressor overload comprising: a thermal sensor;at least one overload terminal each att
1. An encapsulated compressor overload for use with air conditioning or refrigeration systems in a hazardous location where flammable gases or vapors may exist, the encapsulated compressor overload comprising: a compressor overload comprising: a thermal sensor;at least one overload terminal each attached to one of one or more wires;a thermally conductive base bracket located next to the thermal sensor to allow the thermal sensor to sense temperature through the base bracket; anda disc coupled to the base bracket; andencapsulation material forming an air tight cover surrounding the compressor overload and allowing the one or more wires and the base bracket to extend through the air tight cover, such that sparks created by the compressor overload are completely contained within the encapsulation material and prevented from coming into contact with the flammable gases and vapors. 2. The encapsulated compressor overload of claim 1 wherein the base bracket comprises a bottom surface which is not covered by the encapsulation material and is flush with the encapsulation material. 3. The encapsulated compressor overload of claim 1 wherein the encapsulation material is a polyurethane resin and is about one-quarter inch thick. 4. The encapsulated compressor overload of claim 1 wherein all components of the compressor overload which have the ability to become electrically live are substantially covered with a silicone sealant. 5. The encapsulated compressor overload of claim 4 wherein the silicone sealant has a minimum thickness sufficient to meet the minimum flammability rating requirements of UL 94 V-0. 6. An apparatus for adapting a non-hazardous location air conditioner for use in an environment in which flammable gases or vapors are present, the apparatus comprising: an encapsulated compressor overload electrically connected to a compressor of the air conditioner, the encapsulated compressor overload comprising: a compressor overload comprising: one or more components capable of sparking during operation; anda base bracket; anda first encapsulation material forming an air tight cover surrounding the one or more components of the compressor overload, such that sparks created by the compressor overload are completely contained within the first encapsulation material and prevented from coming into contact with the flammable gases and vapors, the base bracket of the compressor overload extending through the first encapsulation material. 7. The apparatus of claim 6, wherein a bottom surface of the base bracket is not covered by and sits flush with the first encapsulation material, wherein the base bracket is thermally conductive, and wherein the one or more components of the compressor overload include a thermal sensor located next to the base bracket and sensing temperature through the base bracket. 8. The apparatus of claim 6, wherein the one or more components of the compressor overload include an overload terminal attached to a wire that extends through the first encapsulation material. 9. The apparatus of claim 6, further comprising an encapsulated compressor start relay electrically connected to the compressor of the air conditioner, the encapsulated compressor start relay comprising: a compressor start relay having a plurality of relay terminals each attached to a corresponding wire of a plurality of wires; anda second encapsulation material forming an air tight cover completely surrounding the compressor start relay and allowing the plurality of wires to extend through the air tight cover, such that sparks created by the compressor start relay are completely contained within the second encapsulation material and prevented from coming into contact with the flammable gases and vapors. 10. The apparatus of claim 9, further comprising an encapsulated pressure switch in electrical communication with the compressor of the air conditioner, the encapsulated pressure switch comprising: a pressure switch having one or more components capable of sparking during operation;an air tight tube surrounding the one or more components of the pressure switch and having a first edge and a second edge; anda sealant material applied to each of the first edge and the second edge, creating an air tight seal around the one or more components of the pressure switch that prevents sparks of the pressure switch from coming into contact with the flammable gases and vapors. 11. The apparatus of claim 10, wherein the one or more components of the pressure switch include a body portion surrounded by the tube, the pressure switch further comprising: a connector extending through the sealant material at the first edge of the tube; andone or more wires extending through the sealant material at the second edge of the tube. 12. The apparatus of claim 10, wherein each of the encapsulated compressor overload, the encapsulated compressor start relay, and the encapsulated pressure switch is individually sealed off from each other sparking components of the air conditioner. 13. The apparatus of claim 9, wherein one or both of the first encapsulation material and the second encapsulation material are a polyurethane resin. 14. The apparatus of claim 9, wherein one or both of the first encapsulation material and the second encapsulation material are about one-quarter inch thick.
Grohman, Wojciech; Hadzidedic, Darko; Nanjundeshaiah, Kamala Kodihally; Courtney, Michael, Method of controlling equipment in a heating, ventilation and air conditioning network.
Furukawa, Hideharu; Ishikawa, Yoshihiko; Shimada, Toshio; Sugawara, Wataru, Protective device for a hermetically sealed type compressor and a hermetically sealed compressor listing same.
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