US3604216A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Crystallization prevention control for absorption refrigeration machine
Assignee: Trane US Inc
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Filing: 1969-09-09
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Granted: 1971-09-14
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Expires: 1989-09-09
Abstract
Abstract A control switch senses impending crystallization in an absorption refrigeration machine to prevent solidification of absorption solution in critical areas of the machine. A sensing element senses a rise in the temperature of the concentrated absorption solution leaving the solution heat exchanger, which temperature rise is indicative of impending crystallization. This sensor can actuate a plurality of controls which will cause dilution of the concentrated solution in the heat exchanger or other crystallization prone areas. When the temperature of the concentrated solution leaving the solution heat exchanger falls below a predetermined level after decrystallization has occurred, additional automatic controls are actuated to initiate a dilution and shutdown cycle.
Inventors
- 👤 James M Porter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:51
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: 6
Claim 1
Independent Claim
165 words
An absorption refrigeration machine including an absorber, an evaporator, a condenser, a generator, first conduit means for conducting concentrated solution from said generator to said absorber, second conduit means for conducting dilute solution from said absorber to said generator, and a heat exchange means for placing said second conduit means in heat exchange relationship with said first conduit means at a point between said generator and said absorber, said heat exchange means having a first flow passage comprising a portion of said first conduit means and a second flow passage comprising a portion of said second conduit means, said heat exchange means positioned below said generator, the improvement comprising: control means for sensing the exit temperature of concentrated solution from said first flow passage, and for generating a control signal when said exit temperature exceeds a predetermined maximum and, anticrystallization means for adding refrigerant to said concentrated solution causing a dilution of concentrated solution in said first flow passage in response to said control signal.
Claim 2
Dependent Claim
165 words
An absorption refrigeration machine including an absorber, an evaporator, a condenser, a generator, first conduit means for conducting concentrated solution from said generator to said absorber, second conduit means for conducting dilute solution from said absorber to said generator, and a heat exchange means for placing said second conduit means in heat exchange relationship with said first conduit means at a point between said generator and said absorber, said heat exchange means having a first flow passage comprising a portion of said first conduit means and a second flow passage comprising a portion of said second conduit means, said heat exchange means positioned below said generator, the improvement comprising: control means for sensing the exit temperature of concentrated solution from said first flow passage, and for generating a control signal when said exit temperature exceeds a predetermined maximum and, anticrystallization means for adding refrigerant to said concentrated solution causing a dilution of concentrated solution in said first flow passage in response to said control signal.
Claim 3
Dependent Claim
92 words
The machine Of claim 1 including a first heat exchanger in said evaporator, a collection pan positioned below said heat exchanger, first circuit means including said pan for recirculating refrigerant from said collection pan for distribution onto said first heat exchanger, the improvement further comprising: third conduit means for placing said first circuit means and said first flow passage in fluid communication, first valve means for controlling flow in said third conduit means responsive to said control signal, said first valve means being closed during a normal operational cycle of said machine.
Claim 4
Dependent Claim
92 words
The machine of claim 1 including a first heat exchanger in said evaporator, a collection pan positioned below said heat exchanger, first circuit means including said pan for recirculating refrigerant from said collection pan for distribution onto said first heat exchanger, the improvement further comprising: fourth conduit means for placing said first circuit means and said first conduit means between said generator and said heat exchange means in fluid communication, second valve means for controlling flow in said fourth conduit means responsive to said control signal, said second valve means normally closed.
Claim 5
Dependent Claim
64 words
The machine of claim 1, the improvement further comprising: fifth conduit means for placing said second conduit means between said generator and said heat exchange means in fluid communication with said first flow passage, third valve means for controlling flow in said fifth conduit means responsive to said control signal, said third valve means normally closed, said control means actuating this third valve means.
Claim 6
Dependent Claim
63 words
5. The machine of claim 1, the improvement further comprising: sixth conduit means for placing said second conduit means between said generator and said heat exchange means in fluid communication with said first conduit means between said generator and said absorber, fourth valve means for controlling flow in said sixth conduit means responsive to said control signal, said fourth valve means normally closed.
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) | 1974-09-13 | 1975-03-15 | 1975-09-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-13 | 1979-03-15 | 1979-09-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-13 | 1983-03-15 | 1983-09-14 | $7700.00 | Window Closed / Lapsed |