JP2000081294A - Heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress an increase in size of a heat exchanger while improving pressure resistance and mountability. SOLUTION: A flat header tank 130 is constituted of a core plate 131 of a rolled material and a cap cell 132 of an extruded material. A communicating part 136 for communicating a tank space 133 with a tank space 134 is formed at a partition wall 136 for partitioning a first tank space 133 for communicating with a first tube 111 and a second tank space 134 for communicating with a second tube 121 formed in the tank 130. Thus, a protrusion and a recess can be eliminated from a profile of the exchanger, brazing positions (connecting positions) are reduced, and the both spaces in the tank 133, 134 are communicated in the tank 130. Accordingly, an increase in size of the exchanger can be suppressed while improving pressure resistance and mountability.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchanger, and is effective when applied to an evaporator or a condenser of a vehicle air conditioner.

[0002]

2. Description of the Related Art In recent years, as a countermeasure against chlorofluorocarbon in a refrigeration system,
Research on refrigeration systems using carbon dioxide as a refrigerant has been conducted. Since the refrigeration system using carbon dioxide as a refrigerant has a higher operating pressure than a refrigeration system using chlorofluorocarbon as a refrigerant, a higher pressure resistance is required as compared with a heat exchanger of a refrigeration system using fluorocarbon as a refrigerant. Is done.

In response to this request, for example, Japanese Utility Model Application Laid-Open No. 6-2
As described in Japanese Patent Publication No. 2017 (see FIG. 5), a means for arranging a header tank for supplying a refrigerant to a tube with a round pipe is conceivable.

[0004]

However, in the heat exchanger described in the above-mentioned publication, a large number (10) of round pipes constituting a header tank are arranged at the end (outside) of the core. Therefore, irregularities occur in the outer shell of the heat exchanger. For this reason, the heat exchanger described in the above publication has a problem that it is difficult to mount (mount) the heat exchanger in the air-conditioning casing (low mountability).

In the heat exchanger described in the above publication, a header tank is constituted by a large number of round pipes.
A joint pipe j (see FIG. 5) for communicating between the round pipes is required, and the number of connection points increases. For this reason, in a refrigerating apparatus having a high operating pressure, such as a refrigerating apparatus using carbon dioxide as a refrigerant, there is a possibility that the pressure resistance is reduced.

Furthermore, since the joint pipe j and the round pipe (header tank) need to be thick in order to improve the pressure resistance, the heat exchanger may be increased in size. In view of the above, an object of the present invention is to improve the pressure resistance and the mountability and to suppress an increase in the size of a heat exchanger.

[0007]

The present invention uses the following technical means to achieve the above object. Claim 1
According to the invention described in Item 3, fluid is distributed to and supplied to both tubes (111, 121) while being connected to both ends of both tubes (111, 121).
1) a flat header tank (130) for collecting and recovering the fluid flowing out of the two tubes (111, 12);
In the header tank (130) at one end in the longitudinal direction of 1),
A plurality of first tank spaces (133) extending in a direction orthogonal to the longitudinal direction of the first tube (111) and communicating with the plurality of first tubes (111), and a longitudinal direction of the second tube (121). A plurality of second tank spaces (134) extending in a direction perpendicular to the direction and communicating with the plurality of second tubes (121) are formed, and partition walls (135) partition the two tank spaces (133, 134). A communication portion (136) for communicating the two tank spaces (133, 134) is formed in a part of the header tank (13).
0) is a core plate (13) made of a rolled aluminum material to which both tubes (111, 121) are connected.
1) and a cap cell (132) made of an extruded aluminum material integrally formed with a partition wall (136).
2) is characterized in that the core plate (131) is brazed by a brazing material coated thereon.

Accordingly, since the header tank (130) has a flat shape, unevenness can be eliminated from the outer shell of the heat exchanger. Therefore, the mountability of the heat exchanger on the air conditioning casing can be improved. Further, since the communicating portion (136) for communicating the two tank spaces (133, 134) is formed on the partition wall (135), the two tank spaces (133, 134) communicate with each other in the header tank (130). Thus, as described in the above publication, there is no need to provide a joint pipe j outside the header tank.

Therefore, since the number of connection points can be reduced, the pressure resistance can be improved, and the unevenness can be eliminated from the outer portion of the heat exchanger, so that the heat exchanger can be easily mounted on the air-conditioning casing. Can be done. As described above, according to the present invention, it is possible to suppress an increase in the size of the heat exchanger while improving the pressure resistance and the mountability.

[0010] Incidentally, the reference numerals in parentheses of the above means are examples showing the correspondence with specific means described in the embodiments described later.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the present embodiment, a heat exchanger according to the present invention is applied to an evaporator (evaporator) of a vehicle air conditioner. FIG. 1 shows a heat exchanger 1 according to the present embodiment.
FIG. In FIG. 1, reference numeral 111 denotes a plurality of flat tubes (hereinafter, referred to as first tubes) through which a refrigerant (fluid) flows, and a corrugated aluminum (book) is provided between the first tubes 111. In the embodiment, A3
003 is covered with a brazing material). Then, the first tube 111
The corrugated fins 112 constitute a first core portion 110 that performs heat exchange between the refrigerant and the blown air.

The first tube 111 is formed by extruding an aluminum material (A1050 in the present embodiment) integrally by extrusion, and the first tube 111 and the corrugated fin 112 are provided on both the front and back surfaces of the corrugated fin 112. The brazing material is integrally brazed. Incidentally, the brazing material is a metal material having a lower melting point than the first tube 111 and the corrugated fin 112, and is A4343 in the present embodiment.

A second core portion 120 composed of a flat tube and corrugated fins is provided on the upstream side of the air flow with respect to the first core portion 110, similarly to the first core portion 110. Hereinafter, the flat tube of the second core part 120 is referred to as a second tube 121 (see FIG. 2). By the way, the refrigerant is distributed and supplied to both tubes 111 and 121 at both ends of both tubes 111 and 121,
A flat header tank 130 for collecting and collecting the refrigerant flowing out of the tubes 111 and 121 is provided. The header tank 130 is made of aluminum to which the tubes 111 and 121 are connected as shown in FIG. And a cap cell 132 made of an extruded aluminum material that forms a space through which the refrigerant flows together with the core plate 131.

The first inside of the header tank 130 is
While extending in a direction orthogonal to the longitudinal direction of the tube 111, it communicates with the plurality of first tubes 111, and
A plurality of (two in the present embodiment) first tank spaces 133 having a substantially circular cross section and a direction extending in a direction orthogonal to the longitudinal direction of the second tubes 121 communicate with the plurality of second tubes 121, Further, a plurality of (two in the present embodiment) second tank spaces 134 having a substantially circular cross section are formed.

As shown in FIGS. 2 to 4, the two tank spaces 133 and 134 are provided in the header tank 130 at one end (upper end in the present embodiment) of both tubes 111 and 121 of the two header tanks 130. Partition wall 135
A communication portion 136 that connects the two tank spaces 133 and 134 to one another is formed. For this reason, the first core unit 11
As shown in FIG.
6 through the second core portion 120 (the second tank space 13).
4).

As shown in FIG. 2 to FIG. 4, two portions of the first partition wall 137 that partition the two first tank spaces 133 correspond to portions where the first tube 111 is connected. A first communication portion 138 that connects the first tank space 133 is formed. Further, a portion of the second partition wall 139 that partitions the two second tank spaces 134, corresponding to the portion to which the second tube 121 is connected, has a second communication portion that allows the two second tank spaces 134 to communicate with each other. 140 are formed.

The partition walls 135, 137 and 139 are
The communication portions 136, 138, and 140 are formed integrally with the extrusion of the cap cell 132, and are formed by milling after the formation of the cap cell 131. In FIG. 4, reference numeral 141 denotes first and second tank spaces 133 and 13.
A groove for inserting and positioning a partition wall (not shown) that partitions the space 4 into two spaces.

Incidentally, of the two header tanks 130, the header tanks 130 on the other end side (lower end side in the present embodiment) of both tubes 111 and 121 are provided with a communication portion 136 and a groove 141 (first and second tank spaces 133). , 134 into two spaces are not provided. Here, an outline of a manufacturing method (assembly method) of the heat exchanger 100 will be described.

As shown in FIGS.
1 is plastically deformed toward the inside of the core plate 131 to caulk and fix the core plate 131 and the cap cell 132 (tank temporary assembling step). Next, the corrugated fins 112 are inserted between the tubes 111 and 121 to temporarily assemble the core portions 110 and 120, and the header tank 130 (core plate 131) is inserted into both ends of the tubes 111 and 112 ( Core assembly process).

Thereafter, the heat exchanger 100 is heated in a furnace while the core portions 110 and 120 and the header tank 130 are fixed with wires or the like, and vacuum brazing is performed (brazing step). At this time, the tubes 111 and 121 and the cap cell 132 are integrally brazed by the brazing material coated on the front and back surfaces of the core plate 131.

Next, the features of this embodiment will be described. According to the present embodiment, since the header tank 130 has a flat shape, unevenness can be eliminated from the outer shell of the heat exchanger 100. Therefore, the mountability of the heat exchanger 100 on the air conditioning casing can be improved. In addition, partition wall 1
Since the communication portion 136 that connects the two tank spaces 133 and 134 to each other is formed on the
34 communicates inside the header tank 130, and as described in the above-mentioned publication, there is no need to provide a joint pipe j outside the header tank. Therefore, the number of brazing portions (connection portions) can be reduced, so that the pressure resistance can be improved.

Further, since the unevenness can be eliminated from the outer part of the evaporator, the mountability of the evaporator on the air-conditioning casing can be improved. As described above, according to the present embodiment, it is possible to suppress an increase in the size of the heat exchanger while improving the pressure resistance and the mountability. By the way, in the above-described embodiment, the first and second communication portions 138 and 140 are provided at portions corresponding to the first and second tubes 111 and 121, however, the present invention is not limited to this. ,
First and second communication portions 138 and 140 and first and second tubes 11
1, 121 may be shifted.

The sectional shape of the tank spaces 133 and 134 is not limited to a circular shape, but may be a substantially elliptical shape including a straight portion and an arc portion. Further, the heat exchanger according to the present invention is not limited to the evaporator of the vehicle air conditioner, but can be applied to other heat exchangers. In the above-described embodiment, both tubes 111,
121 were formed separately, but both tubes (111, 12
1) may be integrally formed by means such as extrusion or drawing and welding.

In the above-described embodiment, the cap cell 132 and the core plate 131 are brazed by the brazing material coated on the core plate 131. However, silicon powder is applied to either the cap cell 132 or the core plate 131. It may be applied and brazed.

[Brief description of the drawings]

FIG. 1 is a perspective view of a heat exchanger (evaporator) according to an embodiment.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a sectional view taken along line BB of FIG. 1;

FIG. 4A is a front view of a cap cell, and FIG.
FIG. 3 is a side view of FIG.

FIG. 5 is a perspective view of a heat exchanger according to the related art.

[Explanation of symbols]

111: first tube, 121: second tube, 130
... Header tank, 131 ... Core plate, 132 ... Cap cell, 133 ... First tank space, 134 ... Second tank space, 135 ... Partition wall, 136 ... Communication part, 137 ... First partition wall, 138 ... First communication Part, 139 ... second partition wall,
140 ... second communication part.

 ────────────────────────────────────────────────── ─── Continuing from the front page (72) Inventor Osamu Kobayashi 1-chome, Showa-cho, Kariya-shi, Aichi F-term in DENSO Corporation (Reference) 3L103 AA02 AA05 AA11 BB38 DD08 DD32 DD34 DD43

Claims (4)

[Claims] A first tube (111) through which a fluid flows, wherein the first tube (111) is connected to the fluid;
1) a first core portion (110) for performing heat exchange with an external fluid flowing outside; and a first core portion (110) disposed upstream of the first core portion (110) in a flow direction of the external fluid, A second core part (120) having a plurality of second tubes (121) through which a fluid flows and performing heat exchange between the fluid and the external fluid flowing outside the second tubes (121); The two tubes (111, 121) are connected to both ends thereof to distribute and supply the fluid to the two tubes (111, 121) and to connect the two tubes (111, 121).
1) a flat header tank (130) for collecting and recovering the fluid flowing out of the first tube, and the first tube is provided in the header tank (130) at one end in the longitudinal direction of both tubes (111, 121). The plurality of first tank spaces (133) extending in a direction orthogonal to the longitudinal direction of the (111) and communicating with the plurality of first tubes (111), and the longitudinal direction of the second tubes (121). A plurality of second tank spaces (134) extending in a direction perpendicular to the second tube space (121) and communicating with the plurality of second tubes (121) are formed, and a partition wall (133) that partitions the two tank spaces (133, 134) is formed. 135), a part of the two tank spaces (133, 1).
A communication portion (136) is formed to communicate the tubes (11) with the tubes (11).
1, 121), a core plate (131) made of a rolled aluminum material, and the partition wall (13).
6. The heat exchanger according to claim 6, wherein the heat exchanger has a cap cell (132) made of an extruded aluminum material integrally formed. 2. The heat exchanger according to claim 1, wherein a cross-sectional shape of each of the two tank spaces is substantially circular. 3. The plurality of first tank spaces (133).
A first communication portion (138) for communicating the plurality of first tank spaces (133) to a portion of the first partition wall (137) to which the first tube (111) is connected.
The second tube (12) of the second partition wall (139) that partitions the plurality of second tank spaces (134) is formed.
3. The heat according to claim 1, wherein a second communication portion (140) that connects the plurality of second tank spaces (134) is formed in a portion where the first tank is connected. Exchanger. 4. The two tubes (111, 121)
The heat exchanger according to any one of claims 1 to 3, wherein the heat exchanger is integrally formed by extrusion or drawing.