US4285385A
Expired / Lapsed
US
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Method for the production of heat exchangers
Assignee: Hitachi Ltd
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Filing: 1979-06-22
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Granted: 1981-08-25
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Expires: 1999-06-22
Abstract
Abstract A method of producing a heat exchanger in which a fin block of porous metal and fin plates connected to the fin block are unitarily secured to a serpentine heat-transmitting pipe. A plurality of fin molds produced with the use of plastic patterns formed therein with continuous, three-dimensional cavities are assembled with the heat-transmitting pipe shaped beforehand into a serpentine form in such a manner that the fin molds enclose the heat-transmitting pipe with suitable spacing intervals defined between the fin molds themselves and between the fin molds and the heat-transmitting pipe. Molten metal of high thermal conductivity is cast into continuous cavities in the fin molds and into the spacing intervals, and the material of the fin molds is removed after the molten metal has solidified.
Inventors
- 👤 Masakatsu Hayashi
- 👤 Takeo Tanaka
- 👤 Tatsuo Natori
- 👤 Tatsushi Aizawa
- 👤 Shigeru Kojima
- 👤 Takao Senshu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:25
CPC Classifications
F; F28; F28F; F28F13/00; F28F13/003; B; B22; B22C; B22C9/00; B22C9/22; B22C9/24; B22C9/26; B22D; B22D18/00; B22D18/04; B22D19/00; B22D19/0063; B22D19/0072; B22D25/00; B22D25/005; F28D; F28D1/00; F28D1/02; F28D1/04; F28D1/047; F28D1/0477; B22C9/02; B22C9/04; Y; Y10; Y10S; Y10S165/00; Y10S165/907; Y10T; Y10T29/00; Y10T29/49; Y10T29/4935
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
180 words
A method for the production of a heat exchanger comprising the steps of: casting a mold forming material in a fluid state into continuous, three-dimensional cavities in plastic patterns to produce patten-retaining molds; removing by heating said plastic patterns from said pattern-retaining molds to produce fin molds; assembling a plurality of said fin molds with a heat-transmitting pipe shaped beforehand into a substantially serpentine form in such a manner that said fin molds enclose said heat-transmitting pipe with suitable spacing intervals defined between said fin molds themselves and between said fin molds and said heat-transmitting pipe, thereby to produce a fin block mold formed therein with continuous, three-dimensional cavities; casting by introducing molten metal under pressure into said continuous, three-dimensional cavities in said fin block mold and into said spacing intervals and allowing said molten metal to solidify; and removing the material of said fin block mold, thereby producing said heat exchanger in which a porous metal block formed with continuous, three-dimensional pores and fin plates connected to said porous metal block which are unitarily secured to said heat-transmitting pipe.
Claim 2
Independent Claim
180 words
A method for the production of a heat exchanger comprising the steps of: casting a mold forming material in a fluid state into continuous, three-dimensional cavities in plastic patterns to produce patten-retaining molds; removing by heating said plastic patterns from said pattern-retaining molds to produce fin molds; assembling a plurality of said fin molds with a heat-transmitting pipe shaped beforehand into a substantially serpentine form in such a manner that said fin molds enclose said heat-transmitting pipe with suitable spacing intervals defined between said fin molds themselves and between said fin molds and said heat-transmitting pipe, thereby to produce a fin block mold formed therein with continuous, three-dimensional cavities; casting by introducing molten metal under pressure into said continuous, three-dimensional cavities in said fin block mold and into said spacing intervals and allowing said molten metal to solidify; and removing the material of said fin block mold, thereby producing said heat exchanger in which a porous metal block formed with continuous, three-dimensional pores and fin plates connected to said porous metal block which are unitarily secured to said heat-transmitting pipe.
Claim 3
Independent Claim
175 words
A method for the production of a heat exchanger comprising the steps of: casting a mold forming material in a fluid state into continuous, three-dimensional cavities in plastic patterns to produce pattern-retaining molds; assembling a plurality of said pattern-retaining molds with a heat-transmitting pipe shaped beforehand into a substantially serpentine form in such a manner that said pattern-retaining molds enclose said heat-transmitting pipe with suitable spacing intervals defined between said pattern-retaining molds themselves and between said pattern-retaining molds and said heat-transmitting pipe; removing by heating said plastic patterns from said pattern-retaining molds to produce a fin block mold formed therein with continuous, three-dimensional cavities; casting by introducing molten metal under pressure into said continuous, three-dimensional cavities in said fin block mold and into said spacing intervals and allowing said molten metal to solidify; and removing the material of said fin block mold, thereby producing said heat exchanger in which a porous metal block formed with continuous, three-dimensional pores and fin plates connected to said porous metal block which are unitarily secured to said heat-transmitting pipe.
Claim 4
Independent Claim
175 words
A method for the production of a heat exchanger comprising the steps of: casting a mold forming material in a fluid state into continuous, three-dimensional cavities in plastic patterns to produce pattern-retaining molds; assembling a plurality of said pattern-retaining molds with a heat-transmitting pipe shaped beforehand into a substantially serpentine form in such a manner that said pattern-retaining molds enclose said heat-transmitting pipe with suitable spacing intervals defined between said pattern-retaining molds themselves and between said pattern-retaining molds and said heat-transmitting pipe; removing by heating said plastic patterns from said pattern-retaining molds to produce a fin block mold formed therein with continuous, three-dimensional cavities; casting by introducing molten metal under pressure into said continuous, three-dimensional cavities in said fin block mold and into said spacing intervals and allowing said molten metal to solidify; and removing the material of said fin block mold, thereby producing said heat exchanger in which a porous metal block formed with continuous, three-dimensional pores and fin plates connected to said porous metal block which are unitarily secured to said heat-transmitting pipe.
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) | 1984-08-24 | 1985-02-23 | 1985-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-24 | 1989-02-23 | 1989-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-24 | 1993-02-23 | 1993-08-25 | $7700.00 | Window Closed / Lapsed |