Patent US4202182A successfully refreshed from Google Patents.
US4202182A
Expired / Lapsed
US
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Multi-tube evaporator for a cooler used in an automobile
Assignee: Hitachi Ltd
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Filing: 1978-05-03
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Granted: 1980-05-13
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Expires: 1998-05-03
Abstract
Abstract A multi-tube evaporator for a cooler used in an automobile is provided with a columnar member tightly inserted in the evaporating tube at its inlet. A spiral groove is engraved on the surface of the columnar member. The spiral groove serves as a capillary through which refrigerant is expanded.
Inventors
- 👤 Kenichi Kawashima
- 👤 Yosiaki Arima
- 👤 Yoshihide Endo
- 👤 Atsushi Suginuma
- 👤 Akira Uenishi
- 👤 Seigo Miyamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 19:50
CPC Classifications
F; F28; F28F; F28F9/00; F28F9/02; F28F9/026; F28F9/0282; F25; F25B; F25B39/00; F25B39/02; F25B41/00; F25B41/30; F25B41/37
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
129 words
A multi-tube evaporator for a cooler used in an automobile having a refrigerant supply header, a refrigerant collector, a plurality of evaporating tubes connecting said refrigerant supply header and said refrigerant collector, and a plurality of fins associated with evaporating tubes characterized in that a columnar member is tightly inserted in said each evaporating tube at its inlet, the diameter of said columnar member being substantially equal to the inner diameter of said evaporating tube, and capillary means being engraved as a spiral groove on the surface of said columnar member for passing refrigerant from said refrigerant supply header into each evaporating tube by capillary action with a reduction in the pressure of the refrigerant as it passes therethrough, whereby the refigerant is uniformly distributed into the evaporating tubes.
Claim 2
Dependent Claim
129 words
A multi-tube evaporator for a cooler used in an automobile having a refrigerant supply header, a refrigerant collector, a plurality of evaporating tubes connecting said refrigerant supply header and said refrigerant collector, and a plurality of fins associated with evaporating tubes characterized in that a columnar member is tightly inserted in said each evaporating tube at its inlet, the diameter of said columnar member being substantially equal to the inner diameter of said evaporating tube, and capillary means being engraved as a spiral groove on the surface of said columnar member for passing refrigerant from said refrigerant supply header into each evaporating tube by capillary action with a reduction in the pressure of the refrigerant as it passes therethrough, whereby the refigerant is uniformly distributed into the evaporating tubes.
Claim 3
Dependent Claim
24 words
The multi-tube evaporator set forth in claim 1, characterized in that a flow resistance of refrigerant is equal in respect to every spiral groove.
Claim 4
Dependent Claim
23 words
The multi-tube evaporator set forth in claim 2, characterized in that every spiral groove has the same dimension in its diameter and length.
Claim 5
Dependent Claim
34 words
The multi-tube evaporator set forth in claims 1 or 2 or 3, characterized in that the surface of said columnar member, facing to the inner surface of said evaporating tube, is coated by copper.
Claim 6
Dependent Claim
33 words
The multi-tube evaporator set forth in claims 1 or 2 or 3, characterized in that another spiral groove filled with a heat soluble material is engraved on the surface of said columnar member.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-05-13 | 1983-11-12 | 1984-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-05-13 | 1987-11-12 | 1988-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-05-13 | 1991-11-12 | 1992-05-13 | $7700.00 | Window Closed / Lapsed |