EP0287940A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Variable capacity compressor
Assignee: Bosch Corp
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Filing: 1988-04-13
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Granted: —
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Expires: 2008-04-13
Abstract
Abstract A variable capacity compressor (1) for use in a heat-exchange circuit. A pressure responsive valve (29) is provided in a communication passageway extending between a low pressure chamber (34) and a pressure controlled chamber. The pressure responsive valve is operative in response to pressure within the low pressure chamber (34) for opening and closing the communication passageway to control pressure within the pressure controlled chamber, thereby varying the capacity of the compressor in such a manner as to reduce the capacity when the pressure within the low pressure chamber decreases to a level lower than a predetermined value. An electrically operated control device (30) is operative in response to pressure or temperature of refrigerant gas in an evaporator of the heat-exchange circuit for maintaining the capacity large independently of operation of the pressure responsive valve, even if the pressure within the low pressure chamber decreases to a level lower than the predetermined value.
Inventors
- 👤 Hiroyuki C/O Diesel Kiki Co. Ltd. Sugiura
- 👤 Nobuyuki C/O Diesel Kiki Co. Ltd. Nakajima
- 👤 Takeo C/O Diesel Kiki Co. Ltd. Iijima
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-01 17:48
CPC Classifications
F; F04; F04C; F04C29/00; F25; F25B; F25B49/00; F25B49/02; F25B49/022; F04B; F04B27/00; F04B27/08; F04B27/14; F04B27/16; F04B27/18; F04B27/1804; F04C29/12; F04B2027/1809; F04B2027/1813; F04B2027/1822; F04B2027/1831; F04B2027/184; F04B2027/1854; F04B2027/1859; F25D; F25D2400/00; F25D2400/28
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
248 words
A variable capacity compressor for use in a heat-exchange circuit including an evaporator having an outlet for a refrigerant gas, said compressor comprising: a low pressure chamber connected to said outlet of said evaporator; a pressure controlled chamber; communication passageway means extending between said low pressure chamber and said pressure controlled chamber; pressure responsive valve means provided in said communication passageway means and movable, in response to pressure within said low pressure chamber, between a closed position where said pressure responsive valve means closes said communication passageway means to bring said low pressure chamber and said pressure controlled chamber out of communication with each other and an open position where said pressure responsive valve means opens said communication passageway means to bring said low pressure chamber and said pressure controlled chamber into communication with each other, to control pressure within said pressure controlled chamber, thereby varying the capacity of the compressor in such a manner as to reduce the capacity when the pressure within said low pressure chamber decreases to a level lower than a predetermined value; detecting means for detecting either one of pressure and temperature of the refrigerant gas in said evaporator, to generate a signal; and electrically operated control means operative in response to the signal from said detecting means for maintaining the capacity of the compressor large independently of operation of said pressure responsive valve means, even if the pressure within said low pressure chamber decreases to a level lower than said predetermined value.
Claim 2
Dependent Claim
248 words
A variable capacity compressor for use in a heat-exchange circuit including an evaporator having an outlet for a refrigerant gas, said compressor comprising: a low pressure chamber connected to said outlet of said evaporator; a pressure controlled chamber; communication passageway means extending between said low pressure chamber and said pressure controlled chamber; pressure responsive valve means provided in said communication passageway means and movable, in response to pressure within said low pressure chamber, between a closed position where said pressure responsive valve means closes said communication passageway means to bring said low pressure chamber and said pressure controlled chamber out of communication with each other and an open position where said pressure responsive valve means opens said communication passageway means to bring said low pressure chamber and said pressure controlled chamber into communication with each other, to control pressure within said pressure controlled chamber, thereby varying the capacity of the compressor in such a manner as to reduce the capacity when the pressure within said low pressure chamber decreases to a level lower than a predetermined value; detecting means for detecting either one of pressure and temperature of the refrigerant gas in said evaporator, to generate a signal; and electrically operated control means operative in response to the signal from said detecting means for maintaining the capacity of the compressor large independently of operation of said pressure responsive valve means, even if the pressure within said low pressure chamber decreases to a level lower than said predetermined value.
Claim 3
Dependent Claim
54 words
A variable capacity compressor as defined in claim 1, wherein said pressure responsive valve means is moved to said open position when the pressure within said low pressure chamber is higher than said predetermined value, and to said closed position when the pressure within said low pressure chamber is lower than said predetermined value.
Claim 4
Dependent Claim
104 words
A variable capacity compressor as defined in claim 1 or claim 2, wherein said communication passageway means comprises first and second communication passageways extending in parallel relation to each other, said pressure responsive valve means being provided in said first communication passageway for opening and closing same, said electrically operated control means comprising electrically operated valve means provided in said second communication passageway for movement in response to the signal from said detecting means, between a closed position where said electrically operated valve means closes said second communication passageway and an open position where said electrically operated valve means opens said second communication passageway.
Claim 5
Dependent Claim
100 words
A variable capacity compressor as defined in claim 3, including an electric power source connectable to said electrically operated valve means, said detecting means comprising switch means movable in response to the pressure within said evaporator between an ON position where said electric power source and said electrically operated valve means are electrically connected to each other to move said electrically operated valve means to said open position and an OFF position where said electric power source and said electrically operated valve means are electrically disconnected from each other to move said electrically operated valve means to said closed position.
Claim 6
Dependent Claim
46 words
A variable capacity compressor as defined in claim 2, wherein said electrically operated control means is operatively connected to said pressure responsive valve means for maintaining same in said open position even if the pressure within said low pressure chamber is lower than said predetermined value.
Claim 7
Dependent Claim
38 words
A variable capacity compressor as defined in claim 2, wherein the compressor is of wobble-plate type in which a wobble plate is arranged within a crank chamber for swinging movement, said pressure controlled chamber being said crank chamber.
Claim 8
Dependent Claim
54 words
A variable capacity compressor as defined in claim 1, wherein said pressure responsive valve means is moved to said open position when the pressure within said low pressure chamber is lower than said predetermined value, and to said closed position when the pressure within said low pressure chamber is higher than said predetermined value.
Claim 9
Dependent Claim
81 words
A variable capacity compressor as defined in claim 1 or claim 7, wherein said electrically operated control means comprises an electrically operated valve means provided in said communication passageway means at a location between said pressure responsive valve means and said pressure controlled chamber, said electrically operated valve means being movable between an open position where said electrically operated valve means opens said communication passageway means and a closed position where said electrically operated valve means closes said communication passageway means.
Claim 10
Dependent Claim
100 words
A variable capacity compressor as defined in claim 8, including an electric power source connectable to said electrically operated valve menas, said detecting means comprising switch means movable in response to the pressure within said evaporator between an ON position where said electric power source and said electrically operated valve means are electrically connected to each other to move said electrically operated valve means to said open position and an OFF position where said electric power source and said electrically operated valve means are electrically disconnected from each other to move said electrically operated valve means to said closed position.
Claim 11
Dependent Claim
37 words
A variable capacity compressor as defined in claim 7, wherein the compressor is of vane type in which a plurality of compression chambers are defined respectively between adjacent vanes mounted in a rotor for radial sliding movement.
Claim 12
Dependent Claim
97 words
A variable capacity compressor as defined in claim 4 or claim 9, including a manually operated switch serially connected between said switch means of said detecting means and said electric power source, said manually operated switch assuming an ON position where said electric power source and said electrically operated valve means are electrically connected to each other if said switch means is in said ON position, and an OFF position where said electric power source and said electrically operated valve means are electrically disconnected from each other even if said switch means is in said ON position.
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