US3750419A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control circuits for absorption refrigeration machine
Assignee: Arkla Industries Inc
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Filing: 1971-08-11
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Granted: 1973-08-07
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Expires: 1991-08-11
Abstract
Abstract In an absorption refrigerating machine, such as a salt absorption type of machine, control of the temperature in the refrigerant flash chamber is effected by bypassing absorbent around the absorber when the chamber temperature approaches the freezing temperature. Concentration of the salt solution is controlled by withdrawing refrigerant from the circuit into a chamber and dumping the refrigerant into the absorber circuit when there is a drop in the temperature of the cooling water entering the absorber. The heat input to the refrigerant generator is controlled in accordance with the load on the machine as determined by measuring the temperature of the chilled water entering and leaving the evaporator.
Inventors
- 👤 F Bawel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:07
CPC Classifications
F; F25; F25B; F25B49/00; F25B49/04; F25B49/043; F25B15/00; F25B15/02; F25B15/06; F25B2315/00; F25B2315/001; Y; Y02; Y02A; Y02A30/00; Y02A30/27; Y02B; Y02B30/00; Y02B30/62
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
160 words
A refrigeration machine of the absorption type comprising a refrigerant vapor generator, a refrigerant condenser, a refrigerant evaporator, an absorber having an absorbing portion wherein vaporized refrigerant is absorbed into an absorbent solution, and an absorbent circuit including strong-absorbent conduit means for transferring absorbent solution weak in refrigerant from the generator to the absorbing portion of the absorber and conduit means for transferring absorbent solution rich in refrigerant from the absorber to the generator, the improvement which comprises control means for controlling the temperature of the refrigerant in said evaporator so as to prevent freezing of refrigerant liquid therein, said control means including temperature responsive means for controlling the flow of absorbent solution from the generator to the absorbing portion of the absorber, said flow control means being operable to reduce the flow upon the occurrence of a predetermined low temperature in the evaporator and to restore the flow upon the occurrence of a predetermined higher temperature in the evaporator.
Claim 2
Dependent Claim
160 words
A refrigeration machine of the absorption type comprising a refrigerant vapor generator, a refrigerant condenser, a refrigerant evaporator, an absorber having an absorbing portion wherein vaporized refrigerant is absorbed into an absorbent solution, and an absorbent circuit including strong-absorbent conduit means for transferring absorbent solution weak in refrigerant from the generator to the absorbing portion of the absorber and conduit means for transferring absorbent solution rich in refrigerant from the absorber to the generator, the improvement which comprises control means for controlling the temperature of the refrigerant in said evaporator so as to prevent freezing of refrigerant liquid therein, said control means including temperature responsive means for controlling the flow of absorbent solution from the generator to the absorbing portion of the absorber, said flow control means being operable to reduce the flow upon the occurrence of a predetermined low temperature in the evaporator and to restore the flow upon the occurrence of a predetermined higher temperature in the evaporator.
Claim 3
Dependent Claim
64 words
Apparatus as in claim 1 wherein said control means includes at least one by-pass valve in the strong absorbent conduit means operable when open to by-pass at least a portion of the strong absorbent solution past the absorbing portion of the absorber and further includes a temperature-responsive device for opening said by-pass valve upon the occurrence of a predetermined low temperature in sAid evaporator.
Claim 4
Dependent Claim
124 words
A refrigeration machine of the absorption type comprising a refrigerant vapor generator, a refrigerant condenser, a refrigerant evaporator, an absorber having an absorbing portion wherein vaporized refrigerant is absorbed into an absorbent solution, and an absorbent circuit including strong-absorbent conduit means for transferring absorbent solution weak in refrigerant from the generator to the absorbing portion of the absorber and conduit means for transferring absorbent solution rich in refrigerant from the absorber to the generator, the improvement which comprises by-pass means including at least one by-pass valve for by-passing at least a portion of the absorbent solution flowing through said strong-absorbent conduit means pass said absorbing portion of said absorber so as to be mixed with absorbent solution which has passed through said absorbing portion.
Claim 5
Dependent Claim
124 words
A refrigeration machine of the absorption type comprising a refrigerant vapor generator, a refrigerant condenser, a refrigerant evaporator, an absorber having an absorbing portion wherein vaporized refrigerant is absorbed into an absorbent solution, and an absorbent circuit including strong-absorbent conduit means for transferring absorbent solution weak in refrigerant from the generator to the absorbing portion of the absorber and conduit means for transferring absorbent solution rich in refrigerant from the absorber to the generator, the improvement which comprises by-pass means including at least one by-pass valve for by-passing at least a portion of the absorbent solution flowing through said strong-absorbent conduit means pass said absorbing portion of said absorber so as to be mixed with absorbent solution which has passed through said absorbing portion.
Claim 6
Dependent Claim
69 words
A refrigeration machine as in claim 3 wherein said conduit means for transferring absorbent solution rich in refrigerant extends directly between said absorber and said generator and includes an absorbent solution pump, wherein said strong-absorbent conduit means extends directly from said generator to said absorbing portion of said absorber, and wherein said by-pass valve is connected between said two conduit means at a location upstream of said solution pump.
Claim 7
Dependent Claim
197 words
A refrigeration machine of the absorption type comprising a refrigerant vapor generator; a refrigerant condenser; a refrigerant evaporator; an absorber having an upper portion wherein vaporized refrigerant is absorbed into an absorbent solution and a lower portion; and an absorbent circuit including strong absorbent conduit means for transferring absorbent solution weak in refrigerant from the generator to the upper portion of the absorber and weak absorbent conduit means separate from said strong absorbent conduit means for transferring absorbent solution rich in refrigerant from the lower portion of the absorber to the generator; and control means for controlling the temperature of the refrigerant in said evaporator so as to prevent freezing of refrigerant liquid therein, said control means including means for sensing the temperature in the evaporator and valve means in said strong absorbent conduit means responsive to said sensing means to bypass at least a portion of the strong absorbent from said strong absorbent conduit means past said upper portion of said absorber upon the occurrence of a predetermined low temperature in the evaporator and to restore full flow of strong absorbent to said upper portion upon the occurrence of a predetermined high temperature in the evaporator.
Claim 8
Dependent Claim
197 words
A refrigeration machine of the absorption type comprising a refrigerant vapor generator; a refrigerant condenser; a refrigerant evaporator; an absorber having an upper portion wherein vaporized refrigerant is absorbed into an absorbent solution and a lower portion; and an absorbent circuit including strong absorbent conduit means for transferring absorbent solution weak in refrigerant from the generator to the upper portion of the absorber and weak absorbent conduit means separate from said strong absorbent conduit means for transferring absorbent solution rich in refrigerant from the lower portion of the absorber to the generator; and control means for controlling the temperature of the refrigerant in said evaporator so as to prevent freezing of refrigerant liquid therein, said control means including means for sensing the temperature in the evaporator and valve means in said strong absorbent conduit means responsive to said sensing means to bypass at least a portion of the strong absorbent from said strong absorbent conduit means past said upper portion of said absorber upon the occurrence of a predetermined low temperature in the evaporator and to restore full flow of strong absorbent to said upper portion upon the occurrence of a predetermined high temperature in the evaporator.
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) | 1976-08-06 | 1977-02-05 | 1977-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-06 | 1981-02-05 | 1981-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-06 | 1985-02-05 | 1985-08-07 | $7700.00 | Window Closed / Lapsed |