US3855836A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for controlling coolant pressure in evaporator
Assignee: Hitachi Ltd
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Filing: 1974-01-23
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Granted: 1974-12-24
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Expires: 1994-01-23
Abstract
Abstract A mechanism for regulating pressure in an evaporator is provided integrally with a collecting chamber for collecting a coolant from an evaporator, which chamber is provided in a valve for controlling an expansion rate of a coolant, said valve being disposed in a heat cycle system for use in a car cooler or the like, thereby presenting ease in installation, ease in maintenance and ease in manufacture.
Inventors
- 👤 R Takahashi
- 👤 K Kanemoto
- 👤 T Ito
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 18:00
CPC Classifications
F; F25; F25B; F25B41/00; F25B41/20; F25B2341/00; F25B2341/06; F25B2341/068; F25B2341/0683
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
216 words
A pressure control valve for: a cooling system having, a compressor for compressing a coolant, a condenser for condensing the coolant compressed in said compressor into a liquid, a liquid receiver for separating the coolant from the condenser into liquid and gas, an expansion valve for subjecting the liquid coolant from the liquid receiver to expansion, an evaporator for causing heat-exchange between coolant gas from the expansion valve and air, a pressure control valve for maintaining the pressure in the evaporator at a level higher than a predetermined level, and means for returning the coolant gas from said pressure control valve to the compressor; characterized by that said evaporator includes a plurality of coolant gas passages arranged in parallel and a collector for collecting the coolant flowing through said plurality of the coolant gas passages; a housing mechanically connected with said collector; a biasing means provided in said housing, said biasing means having one side, to which is exerted the gas pressure in the collector; a spring for exerting a force on the other side of said biasing means; an adjusting screw for adjusting the pressure of the spring; and a valve means provided between the collector and the means for returning the coolant to the compressor and having an opening capable for varying its size.
Claim 2
Dependent Claim
216 words
A pressure control valve for: a cooling system having, a compressor for compressing a coolant, a condenser for condensing the coolant compressed in said compressor into a liquid, a liquid receiver for separating the coolant from the condenser into liquid and gas, an expansion valve for subjecting the liquid coolant from the liquid receiver to expansion, an evaporator for causing heat-exchange between coolant gas from the expansion valve and air, a pressure control valve for maintaining the pressure in the evaporator at a level higher than a predetermined level, and means for returning the coolant gas from said pressure control valve to the compressor; characterized by that said evaporator includes a plurality of coolant gas passages arranged in parallel and a collector for collecting the coolant flowing through said plurality of the coolant gas passages; a housing mechanically connected with said collector; a biasing means provided in said housing, said biasing means having one side, to which is exerted the gas pressure in the collector; a spring for exerting a force on the other side of said biasing means; an adjusting screw for adjusting the pressure of the spring; and a valve means provided between the collector and the means for returning the coolant to the compressor and having an opening capable for varying its size.
Claim 3
Dependent Claim
131 words
A pressure control valve as defined in claim 1, wherein said valve means has a substantially cylindrical bore communicating with said collector, and a substantially cylindrical movable means retained within said cylindrical bore and adapted to be moved by said biasing means; said substantially cylindrical bore communicating with said collector and having a diametrically enlarged space at a predetermined distance apart from said collector; an exit port provided through said housing so as to communicate to said diametrically enlarged portion for discharging the coolant gas; said movable means actuated by said biasing means being provided with a notched portion near to the collector; whereby said ports is brought into communication by way of said notched portions when said movable means is urged under the pressure in the collector towards said spring.
Claim 4
Dependent Claim
69 words
A pressure control valve as defined in claim 2, wherein said biasing means being adapted to air-tightly seal a portion between said substantially cylindrical movable means and said spring so as not to cause a leakage of gas, and said movable means is provided with a cylindrical inner bore, through which the gas pressure in said collector is exerted on the side of movable means of said biasing means.
Claim 5
Dependent Claim
54 words
A pressure control valve as defined in claim 3, wherein said spring urging at its one end thereof said biasing means to the side of collector and being retained at the other end by the adjusting screw provided in the housing, said spring being changable in length due to rotation of said adjusting screw.
Claim 6
Dependent Claim
80 words
A pressure controlling valve as defined in claim 4, wherein a diaphragm is provided in said collector chamber, said diaphragm having one surface, to which is applied the pressure in the collector chamber and the other surface, to which is applied the pressure in the collector by way of a passage having a large resistance, said diaphragm holding the gas or liquid expansible with the temperature rise, and controlling the expansion valve by biasing the other surface of the diaphragm.
Claim 7
Dependent Claim
69 words
A pressure control valve as defined in claim 5, wherein said biasing means indudes a bellows, and a passage communicating said bellows with said collector having a cylindrical central bore provided in the center of said movable means and, a resistive pAssage crossing said movable means and formed between said movable means and an inner wall of said cylindrical bore of said housing which is adjacent to the bellows.
Claim 8
Dependent Claim
51 words
A pressure control valve as defined in claim 4, wherein one side of said diaphragm constituting a wall of the collecting chamber and the other side thereof constituting a wall of other space, and other space being communicated by way of passages with an outlet port of said pressure control valve.
Claim 9
Dependent Claim
68 words
A pressure control valve as defined in claim 6, wherein said biasing means consists of a bellows, and a passage communicating the bellows with the collecting chamber having a cylindrical central bore provided in the movable means, and a resistive passage crossing said movable means and formed between said movable means and an inner wall of said cylindrical bore of said housing which is adjacent to the bellows.
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) | 1977-12-23 | 1978-06-24 | 1978-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-23 | 1982-06-24 | 1982-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-23 | 1986-06-24 | 1986-12-24 | $7700.00 | Window Closed / Lapsed |