US3744269A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flow control device
Assignee: Hitachi Ltd
•
Filing: 1971-03-19
•
Granted: 1973-07-10
•
Expires: 1991-03-19
Abstract
Abstract A flow control device for controlling the flow of refrigerant passing through an evaporator of a car cooler cycle or the like in which the difference between changes of the pressure and temperature of refrigerant at the outlet of the evaporator is converted into the displacement of a diaphragm in response to which the opening of an expansion valve is controlled, both of the static and dynamic pressures of refrigerant at the outlet of the evaporator are used as said pressure to actuate the diaphragm.
Inventors
- 👤 Y Oshima
- 👤 S Miyamoto
- 👤 M Matumoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 02:31
CPC Classifications
F; F25; F25B; F25B41/00; F25B41/30; F25B41/31; F25B41/33; F25B41/335
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
115 words
A heat exchanging cycle comprising a compressor driven by an engine, a condenser for removing heat carried by refrigerant, an evaporator for absorbing heat from environment by refrigerant flowing therethrough, an expansion valve disposed at the inlet of said evaporator for adiabatically expanding refrigerant, a diaphragm for controlling the opening of said expansion valve, characterized by means for transmitting a pressure corresponding to the temperature of the refrigerant at the outlet of said evaporator to a first chamber disposed at one side of said diaphragm, and means for transmitting both the static and dynamic pressures of the refrigerant at the outlet of said evaporator to a second chamber at the other side of said diaphragm.
Claim 2
Dependent Claim
115 words
A heat exchanging cycle comprising a compressor driven by an engine, a condenser for removing heat carried by refrigerant, an evaporator for absorbing heat from environment by refrigerant flowing therethrough, an expansion valve disposed at the inlet of said evaporator for adiabatically expanding refrigerant, a diaphragm for controlling the opening of said expansion valve, characterized by means for transmitting a pressure corresponding to the temperature of the refrigerant at the outlet of said evaporator to a first chamber disposed at one side of said diaphragm, and means for transmitting both the static and dynamic pressures of the refrigerant at the outlet of said evaporator to a second chamber at the other side of said diaphragm.
Claim 3
Dependent Claim
63 words
A heat exchanging cycle as defined in claim 1, wherein the means for transmitting both the static and dynamic pressures of the refrigerant includes a pressure-equalizing pipe having the opening thereof disposed in a path of refrigerant from said evaporator so as to oppose the flow of refrigerant so that the static and dynamic pressures of refrigerant are applied to said second chamber.
Claim 4
Dependent Claim
146 words
A heat exchanging cycle comprising a compressor driven by an engine, a condenser for removing heat carried by a refrigerant, an evaporator for absorbing heat from the environment by the refrigerant flowing therethrough, an expansion valve disposed at the inlet of said evaporator for adiabatically expanding the refrigerant, and a diaphragm for controlling the opening of said expansion valve, characterized in that first means responsive to the temperature of the refrigerant at the outlet of the evaporator provides a first control pressure corresponding to the temperature of the refrigerant to a first chamber disposed at one side of said diaphragm, and second means responsive to both the static and dynamic pressures of the refrigerant at the outlet of said evaporator provides a second control pressure including the static and dynamic pressures of the refrigerant to a second chamber disposed at the other side of said diaphragm.
Claim 5
Dependent Claim
146 words
A heat exchanging cycle comprising a compressor driven by an engine, a condenser for removing heat carried by a refrigerant, an evaporator for absorbing heat from the environment by the refrigerant flowing therethrough, an expansion valve disposed at the inlet of said evaporator for adiabatically expanding the refrigerant, and a diaphragm for controlling the opening of said expansion valve, characterized in that first means responsive to the temperature of the refrigerant at the outlet of the evaporator provides a first control pressure corresponding to the temperature of the refrigerant to a first chamber disposed at one side of said diaphragm, and second means responsive to both the static and dynamic pressures of the refrigerant at the outlet of said evaporator provides a second control pressure including the static and dynamic pressures of the refrigerant to a second chamber disposed at the other side of said diaphragm.
Claim 6
Dependent Claim
39 words
A heat exchanging cycle as defined in claim 3, wherein said second means includes a pressure-equalizing pipe having an opening disposed in a path of the refrigerant so as to oppose the flow of the refrigerant from said evaporator.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-09 | 1977-01-08 | 1977-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-09 | 1981-01-08 | 1981-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-09 | 1985-01-08 | 1985-07-10 | $7700.00 | Window Closed / Lapsed |