US3659783A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Temperature regulated flow control element for automotive air-conditioners
Assignee: Eaton Corp
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Filing: 1969-10-24
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Granted: 1972-05-02
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Expires: 1989-10-24
Abstract
Abstract Thermally responsive control element in the suction side of the compressor of an air-conditioning system. The control element is in the form of a housing having an integral valve seat formed on the inner wall. A poppet valve is carried by the cup of a thermally responsive element, and is biased into engagement with the seat by a spring. A bellows forms a continuation of the cup and has communication therewith, and with the cup contains a fusible thermally responsive material. The bellows is closed at its outer end and has abutting engagement with the end of the housing. As the temperature of the evaporator reaches a point that condensed water vapor on the evaporator coils tends to freeze, the bellows will contract and allow the valve to reduce the flow of as from the evaporator to the condenser, and thereby avoid uncontrolled freeze-up of the evaporator coils and the blocking of the flow of air through said coils.
Inventors
- 👤 Samuel H Schwartz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 05:33
CPC Classifications
B; B60; B60H; B60H1/00; B60H1/00485; F; F25; F25B; F25B41/00; F25B41/20; F25B41/22; G; G05; G05D; G05D23/00; G05D23/01; G05D23/02; G05D23/021; G05D23/022; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7737
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
317 words
A thermally responsive element, particularly adapted to control the flow of refrigerant gases to a compressor of a refrigerating system and to avoid freeze-up of the evaporator coils of the refrigerating system, comprising; a housing having an end wall; an inlet into said housing adjacent one end thereof; an outlet from the opposite end of said housing; an internal frusto-conical valve seat within said housing intermediate the ends thereof; a poppet valve engageable with said seat; spring means seated at one end in said housing and its opposite end on said valve and biasing said valve into engagement with said valve seat; and an extensible thermally responsive element within said housing including an expansible bellows extending from said poppet valve and engageable with said end wall and containing a fusible thermally responsive material; said thermally responsive element opposing said spring means and maintaining said valve open when in an extended position and retracting upon reductions in temperature to effect a reduction in flow through said valve seat upon temperatures tending to cause freeze-up of the evaporator coils of the refrigerating system; said thermally responsive element carrying said valve at the opposite end of said bellows from the end of said bellows engaging said end wall and in axial alignment with said bellows; said thermally responsive element including a cup-like casing in communication with said extensible bellows and in axial alignment therewith and with said bellows; said valve extending about and carried by said cup-like casing; said valve seat being intermediate the end of said housing and formed integrally therewith; said housing being coupled at one end thereof to the head of a compressor; said outlet including an annular member mounted within the outlet end of said housing; said annular member forming a seat for said spring and being removable to accommodate the removal of said valve and thermally expansible element from the outlet end of said housing.
Claim 2
Dependent Claim
317 words
A thermally responsive element, particularly adapted to control the flow of refrigerant gases to a compressor of a refrigerating system and to avoid freeze-up of the evaporator coils of the refrigerating system, comprising; a housing having an end wall; an inlet into said housing adjacent one end thereof; an outlet from the opposite end of said housing; an internal frusto-conical valve seat within said housing intermediate the ends thereof; a poppet valve engageable with said seat; spring means seated at one end in said housing and its opposite end on said valve and biasing said valve into engagement with said valve seat; and an extensible thermally responsive element within said housing including an expansible bellows extending from said poppet valve and engageable with said end wall and containing a fusible thermally responsive material; said thermally responsive element opposing said spring means and maintaining said valve open when in an extended position and retracting upon reductions in temperature to effect a reduction in flow through said valve seat upon temperatures tending to cause freeze-up of the evaporator coils of the refrigerating system; said thermally responsive element carrying said valve at the opposite end of said bellows from the end of said bellows engaging said end wall and in axial alignment with said bellows; said thermally responsive element including a cup-like casing in communication with said extensible bellows and in axial alignment therewith and with said bellows; said valve extending about and carried by said cup-like casing; said valve seat being intermediate the end of said housing and formed integrally therewith; said housing being coupled at one end thereof to the head of a compressor; said outlet including an annular member mounted within the outlet end of said housing; said annular member forming a seat for said spring and being removable to accommodate the removal of said valve and thermally expansible element from the outlet end of said housing.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-02 | 1975-11-01 | 1976-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-02 | 1979-11-01 | 1980-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-02 | 1983-11-01 | 1984-05-02 | $7700.00 | Window Closed / Lapsed |