US4311024A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hermetically circulating, absorption type refrigerator
Assignee: Hitachi Ltd
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Filing: 1979-12-17
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Granted: 1982-01-19
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Expires: 1999-12-17
Abstract
Abstract A hermetically circulating, absorption type refrigerator based on a closed circulation system comprised of a successive communication of a regenerator, a condenser, an evaporator, an absorber and a heat exchanger, parts or the whole of said constituent members in contact with an absorbing solution being comprised of a copper material selected from copper and copper alloy, and refrigeration being produced by repetitions of concentration, refrigerant dilution and heat exchange of an aqueous lithium bromide solution sealed in the circulation system is characterized in that the absorbing solution is an aqueous lithium bromide solution containing (a) a nitrate and (b) at least one triazole compound selected from benzotriazole and tolyltriazole, and has a particularly distinguished corrosion resistance.
Inventors
- 👤 Masahiko Itoh
- 👤 Heihatiro Midorikawa
- 👤 Akira Minato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 07:17
CPC Classifications
F; F25; F25B; F25B47/00; F25B47/003; F25B15/00; F25B15/008; F25B30/00; F25B30/04; Y; Y02; Y02A; Y02A30/00; Y02A30/27; Y02B; Y02B30/00; Y02B30/62
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
144 words
A hermetically circulating, absorption type refrigerator based on a closed circulation system of constituent members comprised of a successive communication of a regenerator, a condenser, an evaporator, an absorber and a heat exchanger, parts or the whole of said constituent members in contact with an absorbing solution being comprised of steel and a copper material selected from copper and copper alloy, and refrigeration being produced by repetitions of concentration, refrigerant dilution, and heat exchange of an aqueous concentrated lithium bromide solution sealed in the circulation system, characterized in that said absorbing solution contains the following compounds (a) and (b) for function as a corrosion inhibitor: (a) a nitrate of an alkali metal, and (b) a triazole compound selected from benzotriazole and tolyltriazole in an amount of 0.01 to 0.05% by weight of the nitrate and 0.005 to 0.1% by weight of the triazole compound.
Claim 2
Dependent Claim
144 words
A hermetically circulating, absorption type refrigerator based on a closed circulation system of constituent members comprised of a successive communication of a regenerator, a condenser, an evaporator, an absorber and a heat exchanger, parts or the whole of said constituent members in contact with an absorbing solution being comprised of steel and a copper material selected from copper and copper alloy, and refrigeration being produced by repetitions of concentration, refrigerant dilution, and heat exchange of an aqueous concentrated lithium bromide solution sealed in the circulation system, characterized in that said absorbing solution contains the following compounds (a) and (b) for function as a corrosion inhibitor: (a) a nitrate of an alkali metal, and (b) a triazole compound selected from benzotriazole and tolyltriazole in an amount of 0.01 to 0.05% by weight of the nitrate and 0.005 to 0.1% by weight of the triazole compound.
Claim 3
Dependent Claim
16 words
A hermetically circulating absorption type refrigerator according to claim 1, wherein the nitrate is lithium nitrate.
Claim 4
Dependent Claim
41 words
A hermetically circulating, absorption type refrigerator according to claim 1, wherein the absorbing solution contains the following compounds (a) to (c): (a) a nitrate of an alkali metal, (b) a triazole compound selected from benzotriazole and tolyltriazole, and (c) octyl alcohol.
Claim 5
Dependent Claim
41 words
A hermetically circulating, absorption type refrigerator according to claim 2, wherein the absorbing solution contains the following compounds (a) to (c): (a) a nitrate of an alkali metal, (b) a triazole compound selected from benzotriazole and tolyltriazole, and (c) octyl alcohol.
Claim 6
Dependent Claim
22 words
A hermetically circulating, absorption type refrigerator according to claim 3, wherein the octyl alcohol has a concentration of 5 to 50 ml/l.
Claim 7
Dependent Claim
16 words
A hermetically circulating, absorption type refrigerator according to claim 5, wherein the nitrate is lithium nitrate.
Claim 8
Dependent Claim
60 words
A hermetically circulating, absorption type refrigerator according to claim 1, wherein copper oxide is generated and deposited on the surface of the constituent members comprised of copper and copper alloy in contact with the absorbing solution, said copper oxide being removed before the absorbing solution is inserted, at least in an amount enough to prevent clogging in the circulating system.
Claim 9
Dependent Claim
60 words
A hermetically circulating, absorption type refrigerator according to claim 3, wherein copper oxide is generated and deposited on the surface of the constituent members comprised of copper and copper alloy in contact with the absorbing solution, said copper oxide being removed before the absorbing solution is inserted, at least in an amount enough to prevent clogging in the circulating system.
Claim 10
Dependent Claim
39 words
A hermetically circulating, absorption type refrigerator according to claim 1, wherein copper oxide deposited on the surface of the members comprised of copper material is substantially removed from the surface of the members in contact with the absorbing solution.
Claim 11
Dependent Claim
34 words
A hermetically circulating, absorption type refrigerator according to claim 1, wherein at least a heat-exchanging part of the member in contact with the absorbing solution in the circulating system is comprised of copper material.
Claim 12
Dependent Claim
34 words
A hermetically circulating, absorption type refrigerator according to claim 3, wherein at least a heat-exchanging part of the member in contact with the absorbing solution in the circulating system is comprised of copper material.
Claim 13
Dependent Claim
34 words
A hermetically circulating, absorption type refrigerator according to claim 5, wherein at least a heat-exchanging part of the member in contact with the absorbing solution in the circulating system is comprised of copper material.
Claim 14
Dependent Claim
34 words
A hermetically circulating, absorption type refrigerator according to claim 7, wherein at least a heat-exchanging part of the member in contact with the absorbing solution in the circulating system is comprised of copper material.
Claim 15
Dependent Claim
34 words
A hermetically circulating, absorption type refrigerator according to claim 8, wherein at least a heat-exchanging part of the member in contact with the absorbing solution in the circulating system is comprised of copper material.
Claim 16
Dependent Claim
34 words
A hermetically circulating, absorption type refrigerator according to claim 9, wherein at least a heat-exchanging part of the member in contact with the absorbing solution in the circulating system is comprised of copper material.
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) | 1985-01-18 | 1985-07-20 | 1986-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-01-18 | 1989-07-20 | 1990-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-01-18 | 1993-07-20 | 1994-01-19 | $7700.00 | Window Closed / Lapsed |