US7044210B2
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat transfer pipe and heat exchange incorporating such heat transfer pipe
Assignee: Usui Kokusai Sangyo Kaisha Ltd
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Filing: 2003-05-09
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Granted: 2006-05-16
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Expires: 2023-05-09
Abstract
Abstract Soot adhering to the inner surface of a heat transfer pipe can be removed without lowering the heat transfer efficiency that is the inherent object of the heat transfer pipe or without stopping the cooling operation of the heat transfer pipe. Further, this soot removal can be effected when the amount of soot adhering to the inner surface of the heat transfer pipe is small, thus minimizing the soot-caused lowering in the heat transfer efficiency of the heat transfer pipe. A heat transfer pipe ( 1 ) wherein the inner peripheral surface of an element pipe ( 2 ) through which fluid can flow is formed with longitudinal grooves ( 4 ) as recessed grooves ( 3 ) of cross-section with a given depth such that the longitudinal grooves are parallel with the pipe axis and circumferentially continuous, and a partition wall ( 5 ) of given thickness is formed between the longitudinal grooves ( 4 ): and a heat exchanger incorporating this heat transfer pipe ( 1 ).
Inventors
- 👤 Shouichiro Usui
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:32
CPC Classifications
F; F28; F28F; F28F1/00; F28F1/02; F28F1/022; F28D; F28D7/00; F28D7/16; F28D7/1607; F28F1/10; F28F1/40; F28F3/00; F28F3/02; F28F3/025; F28F2215/00; F28F2215/10
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
117 words
A heat conductive pipe comprising: a base pipe allowing a liquid to flow though an interior thereof; a plurality of axially extending grooves, formed parallel to a pipe axis in a row in a circumferential direction on an inner circumferential surface of the base pipe, having a cross section in a recess shape with a prescribed depth; and a plurality of dividing walls formed between the axially extending grooves adjacent to each other having a prescribed thickness, wherein distance P between the centers of the dividing walls next to each other is defined from 0.2 to 2.0 mm and depth H from the top of the dividing wall is defined from 0.5 P to 1.0 P mm.
Claim 2
Dependent Claim
117 words
A heat conductive pipe comprising: a base pipe allowing a liquid to flow though an interior thereof; a plurality of axially extending grooves, formed parallel to a pipe axis in a row in a circumferential direction on an inner circumferential surface of the base pipe, having a cross section in a recess shape with a prescribed depth; and a plurality of dividing walls formed between the axially extending grooves adjacent to each other having a prescribed thickness, wherein distance P between the centers of the dividing walls next to each other is defined from 0.2 to 2.0 mm and depth H from the top of the dividing wall is defined from 0.5 P to 1.0 P mm.
Claim 3
Dependent Claim
65 words
The heat conductive pipe according to claim 1 , wherein the base pipe is formed with a long plate-shaped fin member extending in a direction of the pipe axis, and wherein said plurality of the axially extending grooves are formed parallel to the pipe axis in a row on the surface of the plate-shaped fin member and the inner circumferential surface of the base pipe.
Claim 4
Dependent Claim
36 words
The heat conductive pipe according to claim 1 or claim 2 , wherein the bottom portion of the axially extending groove, formed in a flat shape is connected to the dividing wall via a corner portion.
Claim 5
Dependent Claim
36 words
The heat conductive pipe according to claim 1 or claim 2 , wherein the bottom portion of the axially extending groove, formed in a flat shape is connected to the dividing wall via an arch portion.
Claim 6
Dependent Claim
29 words
The heat conductive pipe according to claim 2 , wherein the plate-shaped fin members are formed to divide an inner space of the base pipe into a plural number.
Claim 7
Dependent Claim
59 words
The heat conductive pipe according to claim 2 or claim 5 , wherein the plate-shaped fin member is formed by folding a plate member provided individually from the base pipe to form a connecting surface thereof being brazed or welded to the inner circumferential surface of the base pipe corresponding to the inner circumferential surface of the base pipe.
Claim 8
Dependent Claim
32 words
The heat conductive pipe according to claim 1 or claim 2 , wherein the bottom portions of the axially extending grooves and the dividing walls are formed running in a circular shape.
Claim 9
Dependent Claim
56 words
The heat conductive pipe according to claim 1 or claim 2 , wherein one end of the plate-shaped fin member is connected to the inner circumferential surface of the base pipe and the other end thereof is protruded in the base pipe so as not to contact with the inner circumferential surface of the base pipe.
Claim 10
Dependent Claim
46 words
The heat conductive pipe according to claim 8 , wherein the plate-shaped fin member is formed by folding a plate member provided individually from the base pipe to form a connecting surface thereof being brazed or welded to the inner circumferential surface of the base pipe.
Claim 11
Dependent Claim
29 words
The heat conductive pipe according to claim 8 , wherein the plate-shaped fin member and the base pipe are formed in a united body in forming the base pipe.
Claim 12
Dependent Claim
116 words
A heat exchanger assembled with a heat conductive pipe, said heat conductive pipe comprising: the base pipe allowing the liquid to flow thought the interior thereof; the plurality of axially extending grooves, formed parallel to the pipe axis in a row in the circumferential direction, having the cross section in the recess shape with the prescribed depth; and the plurality of dividing walls formed between the axially extending grooves adjacent to each other having the prescribed thickness, wherein distance P between the centers of the dividing walls next each other is defined from 0.2 to 2.0 mm and depth H from the top of the dividing wall is defined from 0.5 P to 1.0 P mm.
Claim 13
Dependent Claim
116 words
A heat exchanger assembled with a heat conductive pipe, said heat conductive pipe comprising: the base pipe allowing the liquid to flow thought the interior thereof; the plurality of axially extending grooves, formed parallel to the pipe axis in a row in the circumferential direction, having the cross section in the recess shape with the prescribed depth; and the plurality of dividing walls formed between the axially extending grooves adjacent to each other having the prescribed thickness, wherein distance P between the centers of the dividing walls next each other is defined from 0.2 to 2.0 mm and depth H from the top of the dividing wall is defined from 0.5 P to 1.0 P mm.
Claim 14
Dependent Claim
82 words
The heat exchanger assembled with the heat conductive pipe according to claim 11 , wherein the long plate-shaped fin member extending in the direction of the pipe axis is formed in the base pipe, and wherein said plurality of the axially extending grooves having the cross section in the recess shape with the prescribed depth are formed parallel to the pipe axis in a row on the surface of the plate-shaped fin member and the inner circumferential surface of the base pipe.
Claim 15
Dependent Claim
41 words
The heat exchanger assembled with the heat conductive pipe according to claim 11 or claim 12 , wherein the bottom portion of the axially extending groove, formed in the flat shape is connected to the dividing wall via a corner portion.
Claim 16
Dependent Claim
40 words
The heat exchanger assembled with the heat conductive pipe according to claim 11 or claim 12 , wherein the bottom portion of axially extending groove, formed in the flat shape is connected to the dividing wall via the arch portion.
Claim 17
Dependent Claim
36 words
The heat exchanger assembled with the heat conductive pipe according to claim 11 or claim 12 , wherein the bottom portions of the axially extending grooves and the dividing walls are formed in the circular shape.
Claim 18
Dependent Claim
58 words
The heat exchanger assembled with the heat conductive pipe according to claim 12 , wherein one end of the plate-shaped fin member is connected to the inner circumferential surface of the base pipe and the other end thereof is protruded in the base pipe so as not to contact with the inner circumferential surface of the base pipe.
Claim 19
Dependent Claim
34 words
The heat exchanger assembled with the heat conductive pipe according to claim 12 , wherein the plate-shaped fin members are formed to divide the inner space of the base pipe into the plural number.
Claim 20
Dependent Claim
68 words
The heat exchanger assembled with the heat conductive pipe according to claim 12 , claim 16 , or claim 17 , wherein the plate-shaped fin member is formed by folding the plate member provided separately from the base pipe to form the connecting surface thereof being brazed or welded to the inner circumferential surface of the base pipe corresponding to the inner circumferential surface of the base pipe.
Claim 21
Dependent Claim
32 words
The heat conductive pipe according to claim 11 or claim 5 , wherein the plate-shaped fin member and the base pipe are formed in a united body in forming the base pipe.
Claim 22
Dependent Claim
41 words
The heat exchanger assembled with the heat conductive pipe according to claim 12 , claim 16 , or claim 17 , wherein the plate-shaped fin member and the base pipe are formed in the united body in forming the base pipe.
References Cited (Backward Citations)
US4154296A
Cited
JPS6086781A
Cited
US4937064A
Cited
US6070657A
Cited
US5655599A
Cited
JPH11108578A
Cited
JP2000018867A
Cited
US6250340B1
Cited
JP2001227413A
Cited
JP2002028775A
Cited
EP1265046A2
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2009-05-15 | 2009-11-14 | 2010-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2013-05-15 | 2013-11-14 | 2014-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2017-05-15 | 2017-11-14 | 2018-05-16 | $7700.00 | Window Closed / Lapsed |