JP2002318093A - Heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat exchanger which has excellent pressure resistance and which can be efficiently manufactured. SOLUTION: The heat exchanger 1 comprises tubes 2 in which a medium flows, and a tank 4 which communicates with the tube 2. The tank 4 is formed in a substantially cylindrical shape by combining a sectional substantially U shaped end plate 41 having a hole 411 in which the tube 2 is inserted with a plug member 42. The end plate 41 is made of a brazing sheet obtained by cladding brazing materials. The plug member 42 is made of an extruded material.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchanger including a tube through which a medium flows, and a tank communicating with the tube.

[0002]

2. Description of the Related Art Generally, a tank of a heat exchanger is formed in a substantially cylindrical shape by a brazing sheet clad with a brazing material. Such tanks include a one-piece type formed by bending a single brazing sheet into a substantially cylindrical shape, and a two-piece type formed by combining two brazing sheets bent into a substantially semicircular cross section. These tanks have the advantages that the tube insertion hole can be formed by press working, and that they can be easily brazed to other members.

[0003]

Conventionally, CFCs have been used as a medium for heat exchangers. However, in recent years, in order to prevent ozone layer destruction and global warming, CFC production has been banned or reduced. I have.

[0004] Therefore, as an alternative to CFCs, heat exchangers have been developed which use carbon dioxide, which does not destroy the ozone layer and has a global warming effect of several thousandths of CFCs, as a medium.

A heat exchanger using carbon dioxide as a medium circulates carbon dioxide at a very high pressure, so that it is required to have a very high pressure resistance as compared with a conventional one using fluorocarbon as a medium.

For this reason, the thickness of the tank must be extremely large with respect to the diameter of the tank.

However, if the tank is extremely thick,
A tank cannot be formed with a brazing sheet as in the conventional case.

[0008] That is, when the joint is a butt type,
The deformation of the edge portion due to the bending of the brazing sheet is not negligible, and a sufficient brazing area cannot be obtained.

[0009] On the other hand, when the joining portion is formed into an overlapping type, although brazing can be performed well, the difference in level of the overlapping portion becomes nonnegligible, and the shape of the tank cannot be made substantially cylindrical.

Therefore, when forming an extremely thick tank, a tube insertion hole is conventionally cut using an extruded material, but this has not been good in productivity.

The present invention has been made in view of such circumstances, and has as its object to provide a heat exchanger which has excellent pressure resistance and can be manufactured efficiently.

[0012]

According to the first aspect of the present invention,
In a heat exchanger including a tube through which a medium flows and a tank communicating with the tube, the tank is formed by combining a plug member with an end plate having a substantially U-shaped cross section having a hole into which the tube is inserted. The end plate is formed of a brazing sheet clad with a brazing material, and the plug member is formed of an extruded material.

According to the present invention, since the end plate is formed by the brazing sheet, the tube insertion hole can be formed by press working, and brazing to other members is easy. On the other hand, since the plug member is formed of an extruded material, it can be formed according to the shape of the end plate. That is, the joining portion can be satisfactorily brazed, and the tank can be formed into a cylindrical shape having excellent pressure resistance. In addition, the present invention can be satisfactorily carried out even when the thickness of the tank is extremely large, so that it is possible to provide a heat exchanger which has excellent pressure resistance and can be manufactured efficiently.

According to a second aspect of the present invention, in the heat exchanger according to the first aspect, the plug member is press-fitted into the end plate.

According to the present invention, since the plug member is press-fitted into the end plate, the assembling is maintained without being fixed with a jig at the time of brazing in a furnace, and a heat exchanger which can be efficiently manufactured is provided. can do.

The third aspect of the present invention is the first or second aspect.
The heat exchanger according to the invention described above, wherein a concave portion and a convex portion that fit with each other are provided at a joint between the end plate and the plug member.

According to the present invention, the concave portion and the convex portion to be fitted to each other are provided at the joint between the end plate and the plug member, so that the positioning is performed by the fitting of the concave portion and the convex portion, and the furnace brazing is performed. It is possible to provide a heat exchanger in which the assembling is firmly held without being fixed with a jig at the time of assembling and can be efficiently manufactured.

The invention described in claim 4 is the first to third aspects of the present invention.
In the invention according to any one of the first to third aspects, the pressure inside the heat exchanger is higher than a critical point of the medium.

Here, the critical point is the limit on the high temperature side (that is, the limit on the high pressure side) where the gas layer and the liquid layer coexist.
One end of the vapor pressure curve. The pressure, temperature, and density at the critical point are the critical pressure, critical temperature, and critical density, respectively. If the pressure exceeds the critical point of the medium inside the heat exchanger, the medium will not condense.

That is, the present invention is a rationally configured heat exchanger, and can be used very suitably as a heat exchanger in which the internal pressure exceeds the critical point of the medium.

[0021]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a front view showing the heat exchanger of this embodiment.

As shown in FIG. 1, the heat exchanger of this embodiment is a radiator used in a refrigeration cycle for cooling the interior of an automobile. Carbon dioxide is used as the medium, and the pressure inside the heat exchanger 1 exceeds the critical point of the medium depending on usage conditions such as air temperature.

The heat exchanger 1 of this embodiment has a structure in which a plurality of tubes 2 and a plurality of fins 3 are alternately stacked, and the ends of the tubes 2 are connected to a pair of tanks 4 respectively.

The medium is taken into the inside from an inlet 5 provided in one tank 4 and flows through the tube 2 while performing heat exchange by the heat transmitted to the tube 2 and the fins 3, and then flows to the other tank 4. It is discharged to the outside from the outlet 6 provided.

Above and below the layer composed of the tubes 2 and the fins 3, side plates 7 as reinforcing members are provided, and the end of each side plate 7 is supported by the tank 4.

Further, a tube 2, fins 3, tank 4,
The inlet part 5, the outlet part 6, and the side plate 7 are integrally formed by assembling the members constituting them and brazing the assembled body in a furnace.

FIG. 2 is a perspective view showing the tube of this embodiment.

As shown in FIG. 2, the tube 2 of the present embodiment
It is a flat shape formed by extruding an aluminum alloy, and has a plurality of medium flow paths 2 at appropriate intervals in the axial direction.
1 is provided.

The tube 2 has extension portions 22 having no medium flow path on both sides in the width direction. This extension 2
According to 2, the heat transfer area of the tube 2 is enlarged, and the heat exchange property of the medium is further improved.

At the end of the tube 2, there is provided an insertion portion 23 to be inserted into the inside of the tank 4. Insertion part 23
After the extrusion molding, the above-mentioned extension portion 22 is deleted and provided.

As shown in FIG. 3, the tank 4 of this embodiment is configured by combining a plug member 42 with an end plate 41 having a substantially U-shaped cross section, and closing both ends of the tank with closing members (not shown). .

The end plate 41 is provided with a plurality of tube insertion holes 411 for inserting the ends 23 of the tubes 2 in the longitudinal direction.

The end plate 41 is formed by bending a brazing sheet clad with a brazing material into a substantially U-shaped cross section.
As shown in (1), the tube is set in the die 8 and punched out by the punch 9 to form the tube insertion hole 411.

The plug member 42 is formed by using an extruded material, and is formed in such a shape that the joint with the end plate 41 can be satisfactorily brazed and the tank 4 has a cylindrical shape with excellent pressure resistance. I have.

As for the assembling of the end plate 41 and the plug member 42, the clearance at the joint is reduced so that the plug member 42 is pressed into the end plate 41. Thereby, the assembling is maintained without fixing with a jig during brazing in a furnace.

Although the surfaces of the end plate 41 of the present embodiment sandwiching the plug member 42 are parallel to each other, the end plate 41 may be tapered as shown in FIG. 5 to facilitate press-fitting.

Next, a second embodiment of the present invention will be described with reference to FIG.

In this embodiment, a V-groove 412 is provided on the surface of the end plate 41 that sandwiches the plug member 42, and the plug member 42 is provided with a protruding ridge 421 to be fitted thereto.

The V-groove 412 is formed by cutting the end plate 41 after bending it, and the plug member 42
1 by extrusion.

Positioning is performed by fitting these V-grooves 412 and the ridges 421, and the assembly is firmly held without being fixed with a jig during brazing in a furnace.

In this embodiment, the plug member 42 is pressed into the end plate 41 from the radial direction of the tank 4, but may be assembled by sliding the plug member 42 from the axial direction of the tank 4.

The other configuration is the same as that of the first specific example, and the description is omitted.

Next, a third embodiment of the present invention will be described with reference to FIG.

In this embodiment, the projection 413 is provided on the surface of the end plate 41 that sandwiches the plug member 42, and the recess 422 is provided on the plug member 42 to be fitted thereto.

The convex portion 413 of the end plate 41 is formed by press working, and the plug member 42 is formed by extruding into a shape having a concave portion 422.

Although the end plate 41 is convex and the plug member 42 is concave in this embodiment, the end plate 41 may be concave and the plug member 42 may be convex.

Positioning is performed by fitting the convex portion 413 and the concave portion 422, and the assembly is firmly held without being fixed with a jig during brazing in a furnace.

The other configuration is the same as that of the first specific example, and the description is omitted.

[0050]

As described above, according to the first aspect of the present invention, there is provided a heat exchanger including a tube through which a medium flows, and a tank communicating with the tube.
An end plate having a substantially U-shaped cross section having a hole into which the tube is inserted is formed into a substantially cylindrical shape by combining a plug member with the plug member. It is a heat exchanger characterized by comprising.

According to the present invention, since the end plate is formed of a brazing sheet, the tube insertion hole can be formed by press working, and brazing to other members is easy. On the other hand, since the plug member is formed of an extruded material, it can be formed according to the shape of the end plate. That is, the joining portion can be satisfactorily brazed, and the tank can be formed into a cylindrical shape having excellent pressure resistance. In addition, the present invention can be satisfactorily carried out even when the thickness of the tank is extremely large, so that it is possible to provide a heat exchanger which has excellent pressure resistance and can be manufactured efficiently.

According to a second aspect of the present invention, in the heat exchanger according to the first aspect, the plug member is press-fitted into the end plate.

According to the present invention, since the plug member is press-fitted into the end plate, the assembly can be maintained without being fixed with a jig at the time of brazing in a furnace, and a heat exchanger which can be efficiently manufactured is provided. can do.

The third aspect of the present invention is the first or second aspect.
The heat exchanger according to the invention described above, wherein a concave portion and a convex portion that fit with each other are provided at a joint between the end plate and the plug member.

According to the present invention, since the concave portion and the convex portion to be fitted to each other are provided at the joint portion between the end plate and the plug member, the positioning is performed by fitting the concave portion and the convex portion, and the furnace brazing is performed. It is possible to provide a heat exchanger in which the assembling is firmly held without being fixed with a jig at the time of assembling and can be efficiently manufactured.

The invention according to claim 4 is the invention according to claims 1 to 3.
In the invention according to any one of the first to third aspects, the pressure inside the heat exchanger is higher than a critical point of the medium.

A heat exchanger in which the internal pressure exceeds the critical point of the medium is required to have high pressure resistance, so that the thickness of the tank must be extremely large. Advantageous Effects of Invention According to the present invention, it is possible to provide a heat exchanger that can be efficiently manufactured while the internal pressure exceeds the critical point of the medium.

[Brief description of the drawings]

FIG. 1 is a front view showing a heat exchanger according to a specific example of the present invention.

FIG. 2 is a perspective view showing a tube according to a specific example of the present invention.

FIG. 3 is a partially exploded perspective view showing a tank, a tube, and a fin according to a specific example of the present invention.

FIG. 4 is a perspective view showing a step of forming a tube insertion hole in an end plate according to a specific example of the present invention.

FIG. 5 is a sectional view showing a tank according to a specific example of the present invention.

FIG. 6 is an exploded sectional view showing a tank according to a specific example of the present invention.

FIG. 7 is an exploded sectional view showing a tank according to a specific example of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Heat exchanger 2 Tube 21 Medium flow path 22 Extension part 23 Insertion part 3 Fin 4 Tank 41 End plate 411 Tube insertion hole 412 V groove 413 Convex part 42 Plug member 421 Protrusion 422 Concave part 5 Inlet part 6 Outlet part 7 Side plate 8 die 81 hole 9 punch

Claims (4)

[Claims] 1. A heat exchanger comprising a tube through which a medium flows, and a tank communicating with the tube, wherein the tank has a plug member formed on an end plate having a substantially U-shaped cross section and having a hole into which the tube is inserted. Wherein the end plate is made of a brazing sheet clad with a brazing material, and the plug member is made of an extruded material. 2. The heat exchanger according to claim 1, wherein said plug member is press-fitted into said end plate. 3. The heat exchanger according to claim 1, wherein a concave portion and a convex portion that fit with each other are provided at a joint between the end plate and the plug member. 4. The method according to claim 1, wherein a pressure inside the heat exchanger is higher than a critical point of the medium.
The heat exchanger according to any one of the above.