JP2002181488A - Compound type heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problems that the device that is conventionally provided with adjacent flat tubes independently requires the juxtaposition of them at predetermined intervals and the alternate lamination of them with fins so as to cause complicated assembling work, long working time and poor productivity, and that the device that is formed by folding two flat tubes and joining both flat tubes with a plate material has complicated assembling work and the increased man-hour of the assembling work in addition to the large number of parts. SOLUTION: This device is provided with a connecting member 16 connecting the flat tubes 2 of the front and rear heat exchangers integrally, and the height H of the connecting member 16 is set lower than the minor axis (h) of the flat tube 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flat tube structure of a composite heat exchanger in which heat exchangers are arranged in front and behind.

[0002]

2. Description of the Related Art Conventionally, in an integrated heat exchanger,
With respect to the flow of the wind, the one described in Japanese Patent Application Laid-Open No. 10-288476 is known as the one in which the refrigerant flows through the heat exchange part of the second half and then flows through the heat exchange part of the first half. I have. In this publication, as shown in FIGS. 8 and 9,
The flat tube 101 is formed integrally, and is inserted and connected to the header tanks 102 and 103 on both sides. One of the header tanks 102 is provided with a partition portion 104 for partitioning the header tank 102 back and forth. With this configuration, the medium flowing from the inlet 105 to the rear side 102a of one of the header tanks 102 flows laterally through the rear portion 101a of the flat tube 101, and makes a U-turn in the other header tank 103 to be in front of the flat tube 101. It flows through the portion 101b, flows through the front side 102b of one header tank 102, and is discharged from the outlet 106.

Further, a heat exchanger having a core in which flat tubes and fins are alternately stacked is disclosed as a composite heat exchanger in which the heat exchanger is arranged in front and rear in the wind flow direction.
No. 544 is known. In this publication, as shown in FIGS. 10 and 11, flat tubes 201 are arranged in two rows in front and back, and fins 202 having a size extending over the front and rear flat tubes 201 are alternately stacked with the flat tubes 201. ing. Flat tube 201
Are formed by bending a plate material, and the flat tubes are connected to each other by a connection plate member 203.

[0004] Japanese Utility Model Publication No. 6-45155 discloses a pair of header tanks 303 as shown in FIGS.
And a plurality of flat tubes 301 communicating between the header tanks 303 and fins 302 interposed between the flat tubes 301.
In the combined heat exchanger, the front and rear flat tubes 301 and the header tank 303 are separately formed, and the fins 302 are shared by both heat exchangers. Is disclosed.

[0005]

Problems to be Solved by the Invention
No. 76, a flat tube 101 integrally formed in the front-rear direction is formed by a rear portion 101 a and a front portion 10.
1b, the heat transfer between the front and rear portions of the flat tube is large, and the heat exchange performance between the medium in the flat tube and the outside air is poor.

In Japanese Patent Application Laid-Open No. 2000-185544, it is necessary to bend the flat tube 201 and form it, while forming the connecting plate member 203. The flat tube 201 and the connecting plate member 203 formed in this manner are connected together. It needs to be positioned and joined. In addition to the large number of parts, the assembling work is complicated and the man-hour for assembling work increases.

In Japanese Utility Model Publication No. 6-45155,
Adjacent flat tubes 301 are juxtaposed at predetermined intervals,
Since it is necessary to alternately stack the fins 302, the assembling work is complicated, takes a long working time, and the productivity is poor.

[0008]

The invention according to claim 1 comprises a pair of header tanks, a plurality of flat tubes connected between the header tanks, and fins disposed between the flat tubes. In the combined heat exchanger in which the heat exchangers are arranged in front and rear in the wind flow direction, the heat exchanger includes a connecting member that integrally connects the flat tubes of the front and rear heat exchangers, and the connecting member has a short length of the flat tubes. Since the height is set to be lower than the diameter, the flat tube integrated in the front and rear can be obtained at low cost without deteriorating the heat exchange efficiency, and the flat tube and the fin can be easily assembled.

According to a second aspect of the present invention, in the composite heat exchanger of the first aspect, the flat tubes and the connecting members are integrally formed from an extruded material made of an aluminum alloy.
The two flat tubes and the connecting member can be manufactured at one time, the manufacturing cost can be reduced, and the assembling operation can be simplified.

According to a third aspect of the present invention, in the composite heat exchanger according to the first or second aspect, the connecting member is disposed between both ends of the flat tubes inserted into the pair of header tanks. Since the structure is formed with a gap without being provided, this gap portion functions as positioning when the flat tube is inserted into the header tank, which can prevent variation in the insertion work, and obtain a stable assembly work. .

According to a fourth aspect of the present invention, there is provided the composite heat exchanger according to any one of the first to third aspects, wherein the outer walls of the long-diameter end portions of both ends of the flat tube are formed to be tapered. Can be easily inserted and assembled, and the assembling work can be performed efficiently.

According to a fifth aspect of the present invention, in the composite heat exchanger according to any one of the first to fourth aspects, the connecting member is formed with an elongated hole parallel to the longitudinal direction of the flat tube. In addition, heat transfer between the two flat tubes via the connecting member can be reduced.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to the drawings. 1 to 3 show a heat exchanger 1 according to a first embodiment. As shown in FIG. 1, a plurality of flat tubes 2 and wave-like fins 3 for heat radiation are alternately laminated,
End plates 4 are provided above and below the laminated flat tubes 2 and corrugated fins 3, and each end 2 a of these flat tubes 2 is connected to header tanks 5, 7, 6, 8 on both sides to be heated. An exchange 1 is configured. The heat exchanger 1 includes a leeward heat exchanger 1a and an leeward heat exchanger 1b which are arranged in front and rear in parallel. The upper and lower openings of the header tanks 5 and 7, 6 and 8 are closed by cap members 14 and 15, respectively.

In FIG. 1, partition plates 9 and 10 are provided at intermediate positions in the vertical direction of the left and right header tanks 5 and 7 of the front and rear heat exchangers 1a and 1b. An inlet 11 for the heat exchange medium is provided in the upper header tank portion 5a of the leeward heat exchanger 1a, and the lower header-tank portion 7 of the leeward heat exchanger 1b is provided.
b is provided with an outlet 12 for the heat exchange medium. The partition plate 9 of the leeward heat exchanger 1a is the partition plate 1 of the leeward heat exchanger 1b.
It is located above 0. for that reason,
The lower header tank 5b of the leeward heat exchanger 1a and the upper header tank 7a of the leeward heat exchanger 1b are partially overlapped when viewed in the front-rear direction. A communication pipe 13 that connects the wrapped header tank portions 5b and 7a to each other is provided. With this communication pipe 13,
The heat exchange medium flows from the leeward heat exchanger 1a to the leeward heat exchanger 1b.

As shown in FIG. 2, in the heat exchanger of this embodiment, the temperature of the heat exchange medium in the tube is changed in order from the upstream side to T1, T2, T3, T4, T5, T6, T7, T7.
Assuming that 8, T1>T2>T3>T4>T5>T6> T
7> T8. Then, when the temperature difference between the front and rear tubes is compared, (T1-T5) ≒ (T2-T6) ≒ (T3-
T7) ≒ (T4−T8). The temperature difference between the front and rear flat tubes is similar everywhere, and there is almost no variation depending on the location. Since heat exchange is performed almost uniformly over the entire tube, the heat exchange efficiency is good.

As shown in FIG. 3, the flat tube 2 of this embodiment has front and rear flat tubes 2A and 2B connected by a connecting member 16. The height H of this connecting member 16
Is smaller than the height h in the minor diameter direction of the flat tube. In this embodiment, the connecting member 16 is a flat tube 2
A and 2B are integrally provided at a height of about 1/3 at a substantially central portion in the minor diameter direction.

The front and rear flat tubes 2A and 2B and the connecting member 16 are made of an integral aluminum alloy member and are manufactured by extrusion molding at a time, so that the height of the connecting member 16 can be set arbitrarily. After the extrusion molding in this manner, the integrated molded body composed of the flat tubes 2A and 2B and the connecting member 16 is cut at a predetermined length, so that the integrated flat tube group 2A,
2B is obtained. Therefore, a flat tube can be obtained without significantly changing the number of manufacturing steps.

At the time of assembly, the flat tube group 2
Since the core may be assembled by laminating the A and 2B and the wavy fins 3, assembling work is extremely easy and productivity is remarkably improved as compared with the case where separate front and rear flat tubes are juxtaposed and assembled. To improve.

In this embodiment, the connection member 16 is provided at a middle portion of the flat tubes 2A and 2B in the minor diameter direction. In this case, the height H of the connection member 16 is formed lower than the height h of the minor axis of the flat tube. This minimizes the heat transfer from one flat tube to the other flat tube. In order to minimize the heat transfer, the height H of the connecting member 16 is preferably as low as possible.
However, since the front and rear flat tubes 2A and 2B are required to have an appropriate strength when integrated with the fins, the height H of the connecting member is smaller than the height h of the minor diameter of the flat tube in this embodiment. It is about 1/3. The allowable range is empirically 1/2 to 1/5.

Instead of providing the connecting member 16 at the middle portion of the flat tube 2 in the minor diameter direction, it is also possible to provide the connecting member 16 near one of the flat tubes. That is, when one surface of the connection member is provided so as to coincide with one surface of the minor axis of the flat tube, the fin is not easily deformed when the flat tube and the fin are assembled, and the state of the core is stabilized during the assembly. Has benefits.

In this embodiment, as shown in FIG. 1, the front and rear header tanks 5, 7, 6 and 8 are formed separately. Then, header tanks 5 and 7 and header tanks 6 and 8
Are formed integrally with each other. By attaching the front and rear header tanks 5 and 7 to the cap member 14 and the header tanks 6 and 8 to the cap member 15, the front and rear header tanks 5, 7, 6 and 8 are assembled while maintaining a predetermined interval.

FIGS. 4 and 5 relate to the second embodiment. First
The difference from the embodiment will be described. The connecting member 26 is not provided over the entire length of the flat tube 22. Both ends 22a of the flat tube 22, that is, the header tank 25
The connection member 26 is removed from the portion to be inserted into the gap K1. The provision of the space K1 serves as a positioning stopper when both ends 22a of the flat tube 22 are inserted into the header tank 25. That is, the insertion position is determined by inserting until the end of the connection member 26 reaches the edge wall of the insertion hole of the header tank 25 and can no longer be inserted. Further, since the connection area between the two flat tubes 22 is reduced, there is an effect that the heat transfer between the two flat tubes 22 can be reduced.

Reference numeral 27 denotes an elongated hole provided in the connecting member 26, and the two flat tubes 2 through the two flat tubes 22.
The heat transfer between the two is further reduced. The long hole 27 and the gap K1 are used to cut and remove a part of the connection member 26 for the gap K1 when extruding the flat tube 22 and the connection member 26 and press cutting to a predetermined length. Since it can be cut and removed at the same time, the working operation can be performed without increasing the number of working steps.

FIGS. 6 and 7 relate to the third embodiment. First
The difference from the embodiment will be described. As in the second embodiment, both ends 32a, 32a of the flat tube 32, that is, portions of the connecting member 36 to be inserted into the header tank 35 are deleted,
There is a gap K2. In addition, the long-diameter portions 32b, 32b of both ends 32a, 32a are tapered in a tapered shape. Due to the tapered shape of the long diameter portions 32b, both ends 32a are easily inserted into the insertion holes of the header tank 35. The taper can be formed simultaneously with press-cutting the flat tube to a predetermined length.

In the embodiment shown in FIG. 1, a heat exchanger of the type in which the flat tubes and the fins are vertically stacked is described. However, the present invention is not limited to this type. The present invention can also be applied to a type that is stacked in the horizontal direction.

[0026]

According to the present invention, in the composite heat exchanger,
A connecting member that integrally connects the flat tubes of the front and rear heat exchangers is provided, and the connecting member is provided at a height lower than the short diameter of the flat tube. The flat tube can be obtained at low cost, and the flat tube and the fin can be easily assembled.

In particular, in the case where the flat tube and the connecting member are integrally formed from an extruded material made of an aluminum alloy, the two flat tubes and the connecting member arranged side by side can be formed at a time, so that the manufacturing cost is reduced. Therefore, the work of assembling the flat tubes and the fins can be simplified.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a heat exchanger of a first embodiment to which the present invention is applied.

FIG. 2 is a diagram showing a flow and a temperature change of a heat exchange medium of the heat exchanger of the first embodiment.

FIG. 3 is a perspective view of a flat tube and a connection member according to the first embodiment.

FIG. 4 shows a view similar to FIG. 3, and is a perspective view of a flat tube and a connecting member according to a second embodiment.

FIG. 5 is a plan view illustrating a state where the flat tube of the second embodiment is inserted into a header tank.

FIG. 6 shows a view similar to FIG. 3, and is a perspective view of a flat tube and a connecting member according to a third embodiment.

FIG. 7 is a plan view illustrating a state where a flat tube according to a third embodiment is inserted into a header tank.

FIG. 8 is a perspective view showing a conventional heat exchanger.

9 is a partially enlarged perspective view showing a flat tube of the heat exchanger of FIG.

FIG. 10 is a perspective view showing another conventional heat exchanger.

11 is a partially enlarged perspective view showing a flat tube of the heat exchanger of FIG.

FIG. 12 is a perspective view showing still another conventional heat exchanger.

13 is a partially enlarged longitudinal sectional view showing a flat tube and fins of the heat exchanger of FIG.

[Explanation of symbols]

 Reference Signs List 1 heat exchanger 1a leeward heat exchanger 1b leeward heat exchanger 2 flat tube 2a end 3 wavy fin 4 end plate 4a end 5 left header tank 5a upper header tank 5b lower header tank 6 right header tank 7 Left header tank 7a Upper header tank 7b Lower header tank 8 Right header tank 9 Partition plate 10 Partition plate 11 Inlet 12 Outlet 13 Communication tube 14 Cap member 15 Cap member 22 Flat tube 22a End 22b End 25 Header tank 26 Connection Member 27 Long hole K1 Gap 32 Flat tube 32a End 32b End 33a Long diameter portion 33b Long diameter portion 35 Header tank 36 Connection member K2 Gap

Claims (5)

[Claims] 1. A heat exchanger comprising a pair of header tanks, a plurality of flat tubes connected between the header tanks, and fins disposed between the flat tubes, is arranged back and forth in a wind flow direction. In the combined heat exchanger arranged side by side, a connecting member for integrally connecting the flat tubes of the front and rear heat exchangers is provided, and the connecting member is set at a height lower than the minor axis of the flat tube. Combined heat exchanger. 2. The composite heat exchanger according to claim 1, wherein said flat tube and said connecting member are integrally formed from an extruded material made of an aluminum alloy. 3. The flat tube inserted into a pair of header tanks, wherein the connecting member is not provided between both end portions of the flat tube and is formed with a gap therebetween.
The combined heat exchanger as described. 4. The composite heat exchanger according to claim 1, wherein the outer walls of the long-diameter end portions of both ends of the flat tube are tapered. 5. The composite heat exchanger according to claim 1, wherein the connecting member has an elongated hole parallel to a length direction of the flat tube.