Patent US4854380A successfully refreshed from Google Patents.
US4854380A
Expired / Lapsed
US
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Heat exchanger
Assignee: Mitsubishi Electric Corp
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Filing: 1986-10-09
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Granted: 1989-08-08
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Expires: 2006-10-09
Abstract
Abstract A heat exchanger is disclosed, which comprises a plurality of heat-transfer elements (1) placed side by side each of which has more than one through-hole (3) and which are cyclically bent in a generally trapezoidal waveform in the direction of the flow of a fluid, the bends in one heat-transfer element (1) being out of phase with those in an adjacent heat-transfer element (1) by one-half cycle in such a manner that the main stream of said fluid will flow not through the holes in each of said heat-transfer elements (1) but through the passage formed by adjacent heat-transfer elements (1). This arrangement serves to provide improved heat-transfer characteristics.
Inventors
- 👤 Takayuki Yoshida
- 👤 Kiyoshi Sakuma
- 👤 Yu Seshimo
- 👤 Masao Hujii
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 15:11
CPC Classifications
F; F28; F28F; F28F1/00; F28F1/10; F28F1/12; F28F1/24; F28F1/32; F28F1/126; F28F1/128; F28F1/325; F28F13/00; F28F13/003; F28F3/00; F28F3/02; F28F3/025; F28F3/027
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
93 words
A heat exchanger comprising a plurality of heat-transfer elements placed side by side each of which has more than one through-hole and which are cyclically bent in a generally trapezoidal waveform in the direction of the flow of a fluid, the bends in one heat-transfer element being out of phase with those in an adjacent heat-transfer element by one half cycle in such a manner that the main stream of said fluid will flow not through the holes in each of said heat-transfer elements but through the passage formed by adjacent heat-transfer elements.
Claim 2
Dependent Claim
93 words
A heat exchanger comprising a plurality of heat-transfer elements placed side by side each of which has more than one through-hole and which are cyclically bent in a generally trapezoidal waveform in the direction of the flow of a fluid, the bends in one heat-transfer element being out of phase with those in an adjacent heat-transfer element by one half cycle in such a manner that the main stream of said fluid will flow not through the holes in each of said heat-transfer elements but through the passage formed by adjacent heat-transfer elements.
Claim 3
Dependent Claim
61 words
A heat exchanger--according to claim 1 wherein l/L is set to a value of no more than 0.3, l being the projected length of a heat-transfer element in the area corresponding to one half cycle of a series of trapezoidal bends, the projection being made normal to the direction of fluid path, and L being the length of each heat-transfer element.
Claim 4
Dependent Claim
14 words
A heat exchanger according to claim 2 wherein l is at least 2.5 mm.
Claim 5
Dependent Claim
49 words
A heat exchanger according to claim 1 wherein A 2 /A 1 is set to a value of no more than 0.5, A 1 being the width of the larger portion of a fluid passage and A 2 being the width of the smaller portion of said fluid passage.
Claim 6
Dependent Claim
16 words
A heat exchanger according to claim 4 wherein A 2 /A 1 is at least 0.1.
Claim 7
Dependent Claim
23 words
A heat exchanger according to claim 1 wherein the diameter, d, of each of the through-holes is within the range of 0.5-6.0 mm.
Claim 8
Dependent Claim
20 words
A heat exchanger according to claim 1 wherein the relative opening, β, of through-holes is within the range of 0.05-0.3.
Claim 9
Dependent Claim
39 words
A heat exchanger according to claim 1 wherein each of the trapezoidal bends in an individual heat-transfer element is such that the inclined sides thereof make an angle, θ, of 25°-65° with respect to the direction of fluid flow.
Claim 10
Dependent Claim
23 words
A heat exchanger according to claim 1 wherein some of the through-holes are located in the inclined side portions of the heat-transfer elements.
Claim 11
Dependent Claim
35 words
A heat exchanger according to any one of claims 1 to 9 wherein each of said heat-transfer elements is thermally coupled to a second heat-transfer element having a temperature difference from said first heat-transfer elements.
Claim 12
Dependent Claim
40 words
A heat exchanger according to claim 10 wherein said second heat-transfer element passes through the stack of said first heat-transfer elements and is positioned normal to the direction of the flow of the fluid flowing along said first heat-transfer elements.
Claim 13
Dependent Claim
21 words
A heat exchanger according to claim 10 wherein said second heat-transfer element is a pipe through which a second fluid flows.
Claim 14
Dependent Claim
21 words
A heat exchanger according to claim 11 wherein said second heat-transfer element is a pipe through which a second fluid flows.
References Cited (Backward Citations)
JPS50728A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-08-07 | 1993-02-06 | 1993-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-08-07 | 1997-02-06 | 1997-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-08-07 | 2001-02-06 | 2001-08-08 | $7700.00 | Window Closed / Lapsed |