US4261180A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Refrigerator
Assignee: Hitachi Ltd
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Filing: 1978-12-29
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Granted: 1981-04-14
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Expires: 1998-12-29
Abstract
Abstract About 1 to about 25% by weight of a liquid refrigerant is mixed into a refrigerant gas to be introduced into a screw compressor by suction on the basis of the refrigerant gas in a refrigerator comprising a screw compressor, a condenser, and an expansion valve and an evaporator connected to one another in series. A cooling effect as well as a sealing effect can be satisfactorily attained thereby.
Inventors
- 👤 Shigekazu Nozawa
- 👤 Masayuki Urashin
- 👤 Hiroaki Kuno
- 👤 Mitsuhiko Miyagawa
- 👤 Hiroshi Takagi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 09:54
CPC Classifications
F; F25; F25B; F25B41/00; F25B41/30; F25B41/31; F25B41/33; F25B41/335
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
159 words
A refrigerator comprising a screw compressor, a condenser, an expansion valve, and an evaporator, characterized by a temperature-sensing tube of the expansion valve being mounted in contact with a piping of a discharge side of the screw compressor, a tightly sealed space communicating with the temperature-sensing tube being provided over a diaphragm of the expansion valve, a heating means being provided on a wall of the tightly sealed space for heating the tightly sealed space to a temperature higher than the temperature in said temperature-sensing tube so that among a liquid refrigerant and refrigerant gas sealed in the temperature-sensing tube and the tightly sealed space, the liquid refrigerant may be accumulated in the temperature-sensing tube and the refrigerant gas accumulated in the tightly sealed space whereby about 1 to about 25% by weight of liquid refrigerant can be mixed in the refrigerant gas to be introduced into the screw compressor by suction on the basis of the refrigerant gas.
Claim 2
Dependent Claim
159 words
A refrigerator comprising a screw compressor, a condenser, an expansion valve, and an evaporator, characterized by a temperature-sensing tube of the expansion valve being mounted in contact with a piping of a discharge side of the screw compressor, a tightly sealed space communicating with the temperature-sensing tube being provided over a diaphragm of the expansion valve, a heating means being provided on a wall of the tightly sealed space for heating the tightly sealed space to a temperature higher than the temperature in said temperature-sensing tube so that among a liquid refrigerant and refrigerant gas sealed in the temperature-sensing tube and the tightly sealed space, the liquid refrigerant may be accumulated in the temperature-sensing tube and the refrigerant gas accumulated in the tightly sealed space whereby about 1 to about 25% by weight of liquid refrigerant can be mixed in the refrigerant gas to be introduced into the screw compressor by suction on the basis of the refrigerant gas.
Claim 3
Dependent Claim
14 words
A refrigerator according to claim 1, wherein the heating means is an electric heater.
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) | 1984-04-13 | 1984-10-13 | 1985-04-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-04-13 | 1988-10-13 | 1989-04-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-04-13 | 1992-10-13 | 1993-04-14 | $7700.00 | Window Closed / Lapsed |