Source: http://www.google.com/patents/US7207179?dq=5,598,374
Timestamp: 2017-08-22 00:57:08
Document Index: 105629225

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Patent US7207179 - Method of connecting heat transfer pipe and capillary tube - Google Patents
A connecting method and structure is provided to reliably ensure the compressive strength of the joint between a heat transfer pipe and a capillary tube when connecting the capillary tube to the heat transfer pipe by direct brazing. In the connection structure between the heat transfer pipe and the capillary...http://www.google.com/patents/US7207179?utm_source=gb-gplus-sharePatent US7207179 - Method of connecting heat transfer pipe and capillary tube
Publication number US7207179 B2
Application number US 10/525,869
PCT number PCT/JP2004/007489
Also published as CN1304137C, CN1700961A, EP1640083A1, EP1640083A4, EP1640083B1, US20060150669, WO2004110666A1
Publication number 10525869, 525869, PCT/2004/7489, PCT/JP/2004/007489, PCT/JP/2004/07489, PCT/JP/4/007489, PCT/JP/4/07489, PCT/JP2004/007489, PCT/JP2004/07489, PCT/JP2004007489, PCT/JP200407489, PCT/JP4/007489, PCT/JP4/07489, PCT/JP4007489, PCT/JP407489, US 7207179 B2, US 7207179B2, US-B2-7207179, US7207179 B2, US7207179B2
Inventors Yoshinori Kitamura, Nobuhiro Sahara
Patent Citations (12), Classifications (37), Legal Events (3)
Method of connecting heat transfer pipe and capillary tube
US 7207179 B2
A connecting method and structure is provided to reliably ensure the compressive strength of the joint between a heat transfer pipe and a capillary tube when connecting the capillary tube to the heat transfer pipe by direct brazing. In the connection structure between the heat transfer pipe and the capillary tube, a pinched part in which a pipe end part of the capillary tube is inserted and a brazing filler material pooling part for pooling on a pipe end face side of the pinched part the brazing filler material that flows into the pinched part are formed. When inserted into the pinched part, the capillary tube is brazed to the heat transfer pipe.
The present invention relates to a method of connecting a heat transfer pipe and a capillary tube, a jig for flatly crushing the heat transfer pipe, a structure for connecting the heat transfer pipe and the capillary tube, and a heat exchanger.
Among heat exchangers used in air conditioners and the like, a cross fin type is known, as shown in FIG. 1. FIG. 1 is a schematic perspective view that depicts a heat exchanger 101 as one example of a cross fin type heat exchanger.
The plurality of heat transfer pipes 12 passes through the plurality of plate fins 11 in the plate thickness direction, and each heat transfer pipe 12 is then expanded across its entire length (hereinafter, referred to as the primary flare fabrication) and joined to the plate fins 11. Furthermore, the pipe end part 12 a of each heat transfer pipe 12 is further expanded in two stages (hereinafter, referred to as the secondary and tertiary flare fabrication) to form a large-diameter cylindrical flared part 14 and a tapered auxiliary flared part 15 on the pipe end face side of the flared part 14 (refer to FIG. 2). The U-shaped pipes 31, the header pipe 32, and the capillary tubes 41 are brazed to the flared part 14 formed in each pipe end part 12 a.
Next, the conventional method of connecting and connection structure of the heat transfer pipe 12 and the capillary tubes 41 will be explained using FIG. 2 through FIG. 7. FIG. 2 is a cross-sectional view (before flat crushing) that depicts the flat crushing fabrication of the flared part 14, wherein a pinching unit 161 is employed. FIG. 3 is a cross-sectional view taken along the A—A line in FIG. 2. FIG. 4 is a cross-sectional view (after flat crushing) that depicts the flat crushing fabrication of the flared part 14, wherein the pinching unit 161 is employed. FIG. 5 is a cross-sectional view taken along the A—A line in FIG. 4. FIG. 6 is a view (a partially broken view) of the connection structure between the heat transfer pipe 12 and the capillary tube 41 as seen from the flat crushing direction of the flared part 14. FIG. 7 is a view (a partially broken view) from the B arrow direction in FIG. 6.
Furthermore, as shown in FIG. 2 and FIG. 3, the pipe end part 12 a of the heat transfer pipe 12, wherein the capillary tube 41 is connected, is inserted between the tip parts of the pair of levers 162 of the pinching unit 161, and the end face of the pipe end part 12 a is brought into contact with the tip face of the retaining part 163 a. Thereby, the columnar part 163 b is inserted in the pipe end part 12 a.
Next, the tip parts of the pair of levers 162 are closed. Upon doing so, as shown in FIG. 4 and FIG. 5, the tubular part 114 b, having a space wherein the tube end part 41 a of the capillary tube 41 is inserted, remains, the substantial entirety of the flared part 114 is flatly crushed in the pipe latitudinal direction, thus forming the pinched part 114 a. The pinched part 114 a has a tubular part 114 b having a space wherein the tube end part 41 a of the capillary tube 41 is inserted, and a flat flatly crushed sealed part 114 c formed on both sides of the tubular part 114 b.
Next, as shown in FIG. 6 and FIG. 7, the tube end part 41 a of the capillary tube 41 is inserted in the tubular part 114 b of the pipe end part 12 a of the heat transfer pipe 12. Further, the tube end part 41 a of the capillary tube 41 and the tubular part 114 b are brazed. To seal the pipe end part 12 a of the heat transfer pipe 12, the flatly crushed sealed part 114 c is brazed.
In the method of connecting and in the connection structure of the abovementioned heat transfer pipe 12 and the capillary tube 41, the wall thickness of the heat transfer pipe 12 unfortunately thins due to the staged expansion fabrication of the primary through tertiary flare fabrication, and the joint between the heat transfer pipe 12 and the capillary tube 41 is therefore heated during brazing, principally the capillary tube 41 (specifically the C region shown in FIG. 6 and FIG. 7), so as to prevent overheating of the heat transfer pipe 12. Consequently, heating of the part on the opposite side of the pipe end face side of the pinched part 114 a is insufficient, making it difficult for brazing filler material to flow to the part on the opposite side of the pipe end face side of the pinched part 114 a (refer to brazing filler material D shown by the hatched lines in FIG. 6 and FIG. 7).
FIG. 1 is a schematic perspective view that depicts a cross fin type heat exchanger.
FIG. 3 is a cross-sectional view taken along the A—A line in FIG. 2.
FIG. 5 is a cross-sectional view taken along the A—A line in FIG. 4.
FIG. 9 is a cross-sectional view taken along the A—A line in FIG. 8.
FIG. 11 is a cross-sectional view taken along the A—A line in FIG. 10.
The following explains one embodiment of the present invention, referencing the drawings.
The plurality of heat transfer pipes 12 pass through the plurality of plate fins 11 in the plate thickness direction, and each heat transfer pipe 12 is then expanded across its entire length (hereinafter, referred to as the primary flare fabrication) and joined to the plate fins 11. Furthermore, the pipe end part 12 a of each heat transfer pipe 12 is further expanded in two stages (hereinafter, referred to as the secondary and tertiary flare fabrication) to form a large-diameter cylindrical flared part 14 and a tapered auxiliary flared part 15 on the pipe end face side of the flared part 14 (refer to FIG. 8). The U-shaped pipes 31, the header pipe 32, and the capillary tubes 41 are brazed to the flared part 14 formed in each pipe end part 12 a.
(2) Method of Connecting and Connection Structure of the Heat Transfer Pipe and the Capillary Tube
Next, the method of connecting and connection structure of the heat transfer pipe 12 and the capillary tubes 41 will be explained using FIG. 8 through FIG. 13. FIG. 8 is a cross-sectional view (before flat crushing) that depicts the flat crushing fabrication of the flared part 14, wherein a pinching unit 61 is employed. FIG. 9 is a cross-sectional view taken along the A—A line in FIG. 8. FIG. 10 is a cross-sectional view (after flat crushing) that depicts the flat crushing fabrication of the flared part 14, wherein the pinching unit 61 is employed. FIG. 11 is a cross-sectional view taken along the A—A line in FIG. 10. FIG. 12 is a view (a partially broken view) of the connection structure between the heat transfer pipe 12 and the capillary tube 41 as seen from the flat crushing direction of the flared part 14. FIG. 13 is a view (a partially broken view) from the B arrow direction in FIG. 12.
Furthermore, as shown in FIG. 8 and FIG. 9, the pipe end part 12 a of the heat transfer pipe 12, wherein the capillary tube 41 is connected, is inserted between the tip parts of the pair of levers 62 of the pinching unit 61, and the end face of the pipe end part 12 a is brought into contact with the tip face of the retaining part 63 a. Thereby, the first columnar part 63 b and the second columnar part 63 c are inserted in the pipe end part 12 a.
Next, the tip parts of the pair of levers 62 are closed in the X arrow direction. Upon doing so, as shown in FIG. 10 and FIG. 11, the tubular part 14 b, having a space wherein the tube end part 41 a of the capillary tube 41 is inserted, remains, and only the part of the flared part 14 corresponding to the first columnar part 63 b is flatly crushed in the pipe latitudinal direction, thus forming the pinched part 14 a. The pinched part 14 a has a tubular part 14 b having a space wherein the tube end part 41 a of the capillary tube 41 is inserted, and a flat flatly crushed sealed part 14 c formed on both sides of the tubular part 14 b. At this time, along with the formation of the pinched part 14 a, the part on the pipe end face side of the pinched part 14 a is deformed so that it is flattened; however, the extent of this deformation is limited by the second columnar part 63 c, and a substantially elliptically shaped brazing filler material pooling part 14 d is formed. This brazing filler material pooling part 14 d is capable of pooling the brazing filler material that flows into the pinched part 14 a. Furthermore, in the pipe longitudinal direction of the pinched part 14 a formed in the flat crushing process in the present embodiment, the length N1 is at least 0.4 times and less than 0.6 times the length L1 in the pipe longitudinal direction of the flared part 14.
(B) Because the auxiliary flared part 15 is further formed in the method of connecting and in the connection structure of the heat transfer pipe 12 and the capillary tube 41 in the present embodiment, working efficiency can be improved when the brazing filler material flows into the brazing filler material pooling part 14 d.
(C) Setting the dimensions of the flared part 14 and the pinched part 14 a in a prescribed length range in the method of connecting and in the connection structure of the heat transfer pipe 12 and the capillary tube 41 in the present embodiment further improves the effect of transmitting the heat of the brazing filler material pooled in the brazing filler material pooling part 14 d to the part on the opposite side of the pipe end face side of the pinched part 14 a.
(D) The pinching unit 61 of the heat transfer pipe 12 of the present embodiment comprises: a pin 63 comprising a first columnar part 63 b disposed so that the inside of the flared part 14 extends in the pipe longitudinal direction and having a diameter so that the pipe end part 41 a of the capillary tube 41 can be inserted, and a second columnar part 63 c disposed on the pipe end face side of the first columnar part 63 b and having a diameter larger than that of the first columnar part 63 b; and a pair of levers 62 that, by interposing the flared part 14 from the pipe latitudinal direction in a state wherein the pin 63 is disposed inside the flared part 14, is capable of forming the pinched part 14 a by flatly crushing in the pipe latitudinal direction only the part corresponding to the first columnar part 63 b of the flared part 14. Consequently, the pinched part 14 a of the flared part 14 can be formed, and the brazing filler material pooling part 14 d can also be formed.
The use of the present invention can reliably ensure the compressive strength of the joint between the heat transfer pipe and the capillary tube when connecting the heat transfer pipe and the capillary tube by direct brazing.
US3362187 * Mar 9, 1966 Jan 9, 1968 Mcquay Inc Evaporator coil construction
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US5400951 * Aug 31, 1993 Mar 28, 1995 Showa Aluminum Corporation Method of brazing a joint portion of an intake manifold with preplaced brazing
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US6889753 * Dec 17, 2002 May 10, 2005 Ts Heatronics Co., Ltd. Capillary tube heat pipe and temperature controlling apparatus
JPH0481271A Title not available
JPH06307736A Title not available
JPH09250850A * Title not available
U.S. Classification 62/115, 29/890.03, 29/890.052, 165/178
International Classification B23K1/14, F25B41/06, B21D39/04, F25B1/00, B23K1/18, F25B39/02, B21D53/08, B21D19/08, F25B39/00, B23K101/14, B23K1/00, F28F9/26
Cooperative Classification F28F9/0275, B21D39/048, Y10T29/49364, F25B41/067, F28F2275/04, Y10T29/49389, F28F9/26, B23P2700/09, B23K2201/06, Y10T29/4935, B23K1/0008, B21D53/08, F16L13/08, B21D41/04
European Classification B21D41/04, F16L13/08, B23K1/00S, B21D39/04E, B21D53/08, F25B41/06C, F28F9/26
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:KITAMURA, YOSHINORI;SAHARA, NOBUHIRO;REEL/FRAME:016898/0494