WO2004053417A1

WO2004053417A1 - Tank for heat exchanger

Info

Publication number: WO2004053417A1
Application number: PCT/JP2003/015770
Authority: WO
Inventors: Hajime Ohata; Naoto Takayanagi; Shoji Akiyama; Yoshihisa Eto
Original assignee: Zexel Valeo Climate Control Corporation
Priority date: 2002-12-12
Filing date: 2003-12-10
Publication date: 2004-06-24
Also published as: EP1577628A1; US20060011335A1; JPWO2004053417A1; JP4613615B2; EP1577628A4

Abstract

A punch (34) and a dice (35) are inserted for perforation in divided chambers (21, 22), respectively, where the chambers are arranged in parallel along a ventilation direction and the insertion is made from one side of openings open at ends in a length direction of the chambers. A thickness (T1) of a partition portion (20) is thinner than that of conventional partition portions, and, even if a fulcrum and a power point of the punch (34) and the dice (35) are not in the same axis in their operation directions, a mold is able to have higher fatigue strength so as to achieve a planned number of times of use. The thickness of the partition portion (20) is set to between 0.4 mm or more and 1.65 mm or less, which is a range to guarantee the strength of the partition portion to prevent its deformation. This enables that, when communication passages are formed in a post-process in a partition portion of a tank produced by extrusion forming, an optimum thickness of the partition portion to be obtained in order to form the communication passages.

Description

Description Heat exchanger tank Technical field

The present invention relates to a configuration of a heat exchanger tank separate from a heat exchange tube, particularly to a configuration of a partition. Background art

It has a heat exchanger tank and a heat exchanger tank separate from the heat exchanger tube. The heat exchanger tank has a plurality of compartments defined by partitioning the inside of the tank by at least a partition extending in the longitudinal direction. The partition has a plurality of bypass holes provided in the partition with respect to the refrigerant evaporator integrally formed with the tank, and the bypass holes allow the refrigerant to flow between the compartments arranged in parallel along the ventilation direction. The configuration for achieving the bypass is already known (for example, Japanese Patent Application Laid-Open No. H11-2875787 [especially, the paragraph numbers "002" to "02024" and FIG. See Figures 13 and 14). This publication discloses that a plurality of bypass holes are formed in a rectangular shape by simultaneously punching a plurality of thin plates of metal (aluminum or the like) constituting a partition portion by, for example, press working.

However, the above-described manufacturing method of forming a bypass hole in a partition portion is based on the premise that a single thin plate is folded in a plurality of stages by roll homing to form a tank for a heat exchanger. That is, a plurality of holes are drilled at predetermined intervals when the sheet is flat before bending, and burring is erected from the periphery of one of the holes, and the sheet is bent by roll homing and partitioned. In the process of constructing the part, the periphery of one hole By inserting the burring formed in the hole into the other hole, a bypass hole communicating with the partition portion is formed. For this reason, when manufacturing a heat exchanger bottle by extrusion, the above-described method for manufacturing an evaporator cannot be used as it is.

In view of the above, the present invention makes it possible to move the heat exchange medium between the adjoining compartments in the ventilation direction in order to use the heat exchanger in a four-pass heat exchanger with respect to the partition of the heat exchanger tank manufactured by extrusion molding. It is another object of the present invention to provide a heat exchanger tank having a partition part having an optimum thickness. Disclosure of the invention

The heat exchanger for ink according to the present invention is manufactured by extrusion molding, and has an internal space defined by a plurality of compartments arranged in parallel in the ventilation direction by partitioning portions extending along the stacking direction of the heat exchange tubes. Is characterized in that a communication passage communicating between the chambers is formed. This makes it possible for the heat exchange medium to move between the plurality of compartments via the communication passage, even in the case of the heat exchanger evening cup formed integrally with the outer peripheral portion by extrusion molding.

Here, it is conceivable to form a notch with one side open to the partition part and to form a communication path with the lid part for closing the opening of the compartment, but when the lid is not assembled, It is conceivable that a portion of the side along the longitudinal direction of the sunset that has the communication passage may have a problem that the strength is weakened by the cutout of the partition. For this reason, it is preferable that the communication path forms a hole-shaped communication path with respect to the partition in the subsequent process, instead of a cutout shape. In such a configuration, the strength of the tank can be relatively increased. In addition, in consideration of the distribution of the heat exchange medium in the tank, a hole-shaped communication passage may be formed in the partition at a predetermined distance from an end in the longitudinal direction of the tank. preferable. '

By the way, as a method of forming a communication passage in a partition part of a tank manufactured by extrusion molding in a later process, a punch and a die are respectively formed from one of the openings opened at the longitudinal end with respect to the compartments arranged in parallel in the ventilation direction. It is conceivable to form a communication passage by inserting and drilling.However, since the fulcrum and the point of force of the punch dies are not coaxial with the working direction of the press, there is a problem that the fatigue strength of the mold is difficult. Have.

This problem can be solved by reducing the thickness of the partition of the heat exchanger tank. Is done.

Therefore, it is desirable that the thickness of the partition portion of the heat exchanger tank according to the present invention be set to 0.4 mm or more and 1.65 mm or less. In this case, the thickness of the outer peripheral portion of the tank is preferably equal to or greater than the thickness of the partition.

As a result, in the heat exchanger tank, when punching is performed by inserting a punch die from one of the openings opened at the longitudinal end of the compartments arranged in parallel in the ventilation direction, Thickness is 0.4 mm or more and 1.65 mm or less, the partition part is relatively thinner than the conventional partition part, and the fulcrum and force point of the punch and die are coaxial with the operating direction. Even if this is not the case, it is possible to increase the fatigue strength of the mold so that the expected number of uses of the mold can be ensured, and at the same time, to reduce the thickness of the mold to ensure the necessary strength to prevent the deformation of the partition. However, it is possible to avoid a problem that the partition part is deformed when the partition plate is inserted and mounted in the slit of the tank or in an environment of a market specification. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 (a) is a rear view in the ventilation direction showing the overall configuration of a heat exchanger using the heat exchanger tank according to the present invention, and FIG. 1 (b) is a general configuration of the same heat exchanger. Fig. 2 (a) is an enlarged sectional view taken along line A-A of Fig. 1, and Fig. 2 (b) is a cross-sectional view taken along line B-B of Fig. 1. Fig. 2 (c) is an explanatory diagram showing a heat exchange tube and a fin, and Fig. 3 (a) is an explanatory diagram showing a heat exchange tube and a fin. , FIG. 3 (b) is a cross-sectional view of the tank, FIGS. 4 (a) to (g) are explanatory views showing a part of the manufacturing process of the heat exchanger, and FIG. FIG. 6 is a perspective view showing a part of a partition part and an outer peripheral part and a configuration of a mold (punch / die). FIG. 6 shows a punch / die inserted into a tank compartment. FIG. 7 is a cross-sectional view showing a state in which a communication passage is formed. FIG. 3 is a diagram illustrating a relationship between a thickness and a maximum stress generated in a punch. BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

The heat exchanger 1 shown in FIG. 1 is used, for example, as an evaporator constituting a part of a refrigeration cycle of a vehicle air conditioner. This heat exchanger 1 is manufactured by an in-furnace brazing method, and comprises a pair of tanks 2 and 3, a plurality of heat exchange tubes 4 communicating the tanks 2 and 3, and a heat exchanger tube 4. A corrugated outer fin 5 that has been inserted and joined, a side plate 6 disposed at the end of the heat exchange tube 4 in the stacking direction, and a connector 9 having heat exchange medium entrances 7 and 8 are attached. Side And a tank 10. The connector 9 is connected to an expansion valve (not shown). The heat exchanger 1 allows a heat exchange medium sent from an expansion valve (not shown) to flow through a side tank 10 and moves between the tanks 2 and 3 by a heat exchange tube 4. Heat is exchanged with the air passing between the outer fins 5 so that the air is finally sent out through the side tank 10.

As shown in FIG. 3 (a), the heat exchange tube 4 has a flat surface in which both ends inserted into the ink tanks 2 and 3 are open, and a heat exchange medium flow path 14 is formed inside. The inner fin 15 is housed in the pipe 13. In this embodiment, the heat exchange tube 4 is formed by bending a single flat tube material by roll homing.

As described above, the tanks 2 and 3 are disposed so as to face each other at a predetermined interval, and are formed by extrusion molding. Therefore, the tanks 2 and 3 do not have a brazing material layer on the surface. A 100-series aluminum alloy is used.

The tank 2 will be described with reference to Fig. 2 (a). The tank 2 has a tube insertion hole 17 for inserting the heat exchange tube 4 and has openings at both ends in the longitudinal direction. The opening is closed by the cap 19. In the tank 2, a partition portion 2.0 extending in the laminating direction of the heat exchange tubes 4 (the longitudinal direction of the tank 2) is formed integrally with the outer peripheral portion 18. As shown in FIG. 3 (b), a compartment 21 and a compartment 22 are defined in parallel in the ventilation direction.

On the other hand, as shown in FIG. 2 (b), the tank 3 has a tube insertion hole 17 for inserting the heat exchange tube 4, and the opening at both ends in the longitudinal direction is formed. The point closed by the cap 19 A partition 20 extending along the stacking direction of the tube 4 (longitudinal direction of the tank 3) is formed in the body, so that the inside of the tank 3 is formed as shown in FIG. 3 (b). However, the configuration is substantially the same as that of the tank 2 in that the compartment 21 and the compartment 22 are arranged in parallel in the ventilation direction. On the other hand, unlike the tank 2, the compartments 21 and 22 of the tank 3 are separated in the middle of the ventilation direction by the partition plate 28 inserted from the slit 29, and the compartment 21 a, It is divided into 2 lb or 22 a and 22 b. The compartments 21b and 22b are connected by a communication path 16 so that the heat exchange medium flows in four passes.

The tank 3 has a protruding portion 3a that protrudes outward in the laminating direction from the heat exchange tube 4 located at the end in the laminating direction. The protruding portion 3a is configured such that the outer peripheral portion 18 extends as it is, and the inside thereof also extends until the partition portion 20 contacts the inner surface of the cap 19. Along with this, in the protruding portion 3a, the above-mentioned compartments 21 and 22 of the evening ink 3 are defined in a continuous state. The compartments 21 and 22 of the protruding portion 3a constitute the most upstream side or the most downstream side of the heat exchange medium. As shown in FIG. 2 (b), the side tanks 10 described below are used. The inflow-side passage 25 and the outflow-side passage 26 communicate with each other through openings 23 and 24 formed in the protruding portion 3a.

Next, a part of the method for manufacturing the heat exchanger 1 will be described with reference to FIG. First, as shown in Fig. 4 (a), for example, from a plurality of stock materials M formed by extrusion molding and stocked so that the longitudinal dimension becomes long (for example, 5m). An arbitrary ink material M is extracted and put on a production line. Then, as shown in FIG. 4 (b), after forming a communication passage 16 in the partition portion 20 at one end portion of the tank material M, as shown in FIG. 4 (c), A tube insertion hole 17 is formed in the M surface 18 A over a predetermined range. Fig. 4 (d) As shown in the figure, the tank material M is cut to have a desired longitudinal dimension with, for example, a circular saw-shaped tool, and the surface 18A, 18B, 18D or the surface 18A, Form slits 29 and 29 across 18C (not shown but facing surface 18B) and 18D, and clean these cuts to remove burrs . Thereby, the shape of the tank 3 is completed. Steps such as formation of the communication passage 16, formation of the tube insertion hole 17, and formation of the slits 29, 29 are repeated until the blank material M is shortened.

Then, as shown in FIG. 4 (e), a partition plate 28 from the slit 29 is attached to the completed tank 3 in the compartment 21 or 22. Finally, as shown in FIG. 4 (f), after the brazing material sheet 30 is attached to the tube insertion hole forming surface 18A of the tank 3, as shown in FIG. 4 (g), The assembling process for the tank 3 is also completed by closing the openings opened on both sides in the longitudinal direction of the tank 3 with the cap 19.

As described above, the tank 2 does not have the communication passage 16, but forms the slits 29, 29, and mounts the partition plate 28 from the slit 29 in the compartment 21 or 22. Since there is no need to do this, a process of cutting the tank material M with a tool instead of Fig. 4 (d) is performed after passing through Figs. 4 (a) and 4 (c), and after that, Fig. 4 As shown in (f), the brazing material sheet 30 is attached to the tube insertion hole forming surface 18A of the ink tank 2, and then as shown in Fig. 4 (g), both sides in the longitudinal direction of the tank 2 Through the process of closing the opening that has been opened to the outside with the cap 19.

Finally, after assembling the heat exchanger 1 by inserting both ends in the longitudinal direction of the heat exchange tube 4 into the tube insertion holes 17 of the tank 2 and the tube insertion holes 17 of the tank 3, By brazing the heat exchanger 1 in the furnace, the manufacture of the heat exchanger 1 is completed. Since the method of assembling the heat exchanger 1 and brazing in the furnace are well known, they are not shown and described. By the way, when the tank 3 is manufactured by extrusion molding, the outer peripheral portion 18 is formed, and at the same time, the partition portion 20 is formed integrally with the outer peripheral portion 18, as shown in FIG. In the form, the partition part 20 has a thickness T1 of 1.0 mm, and the outer peripheral part 18 has a thickness T2 of 1.5 mm on a surface extending in the ventilation direction and a ventilation direction. The thickness T3 of the surface extending in the direction intersecting with the direction is 1.0 mm. That is, the thicknesses T2 and T3 of the outer peripheral portion 18 are equal to or greater than the thickness T1 of the partition portion 20. The thickness T1 of the partition portion 20 is not limited to the above-mentioned dimension 1.'0 mm, but may be in the range of 0.4 mm to 1.65 mm.

Then, the step of forming the communication passage 16 in the partition portion 20 shown in FIG. 4 (b) includes, for example, a punch 34 having a through hole 34a as shown in FIG. Using a die 33 having a die 35 having an outer shape capable of passing through the through hole 34 a of the punch 34 and a movable part 36 for moving the die 35 to the punch 34 side. Do. That is, after the punch 34 and the movable part 36 are inserted from the openings at the longitudinal ends of the compartments 21 and 22, respectively, the punch 34 is moved to the surface of the partition part 20 as shown in FIG. By moving the movable part 36 and moving the tip of the die 35 toward the punch 34 side until it is inserted into the through hole 34a of the punch 34, press working is performed. A rectangular through hole is formed in the partition part 20 to be the communication passage 16.

In this case, the punch 34, the fulcrum and the fulcrum of the dies 35 are not coaxial in the direction of operation of the press. By making it relatively thin, metal fatigue given to the mold 33 is suppressed.

That is, as long as the mold can withstand about 100,000 uses, there is no problem in actual use. When using the SKH51 mold material, as shown in Fig. 7, the allowable limit stress of the press that can withstand 100,000 repetitions is about 850 N / IM2. As shown in Fig. 8, the thickness of the partition part that can be processed with such stress is 1.65 mm or less. The upper limit of the thickness is 1.65 mm. On the other hand, when the partition plate 28 is mounted on the slit 29 of the tank 3 as shown in FIG. 4 (e), the leading end of the partition plate 28 With respect to the force at the time of collision and the force applied to the partition 20 in the market environment, the required strength is maintained by keeping the lower limit of the wall thickness of the partition 20 to 0.4 mm. It has also been found that the partition 20 is secured and does not deform. Industrial applicability

As described above, according to the heat exchanger tank of the present invention, the communication passage is formed in the partition even in the heat exchanger tank in which the partition is formed integrally with the outer peripheral portion by extrusion. As a result, communication between the picture rooms becomes possible, and the strength of the tank can be relatively increased by forming a hole-shaped communication passage instead of a notch shape in the partition in the subsequent process.

According to the invention set forth in claims 3 and 4, the partition portion has a wall thickness in the range of 0.4 mm or more and 1.65 mm or less. Even if it is relatively thinner than the part and the communication path is formed using punches and dies where the fulcrum and force point are not coaxial in the operating direction, the expected number of use of the mold is ensured. In addition to increasing the mold's fatigue strength, the thickness reduction is within the range that guarantees the strength required to prevent the deformation of the partition, so the slit formed on the outer periphery of the tank When inserting and installing the partition plate in the market environment It is also possible to avoid the problem of deformation at.

Claims

The scope of the claims

1. The interior space is defined by a plurality of compartments that are manufactured by extrusion and have an internal space extending in the stacking direction of the heat exchange tubes in a plurality of compartments arranged in the ventilation direction, and the compartments communicate with the compartments. A tank for a heat exchanger, wherein a communication passage is formed.

2. The heat exchanger tank according to claim 1, wherein the communication passage is formed by perforating the partition.

3. The heat exchanger tank according to claim 1, wherein the partition portion has a thickness of 0.4 mm or more and 1.65 mm or less.

4. The thickness of the outer peripheral portion of the tank is equal to or greater than the thickness of the partition, wherein the thickness of the tank is greater than the thickness of the partition. An ink for the heat exchanger described.