JPH0517382U - Heat exchanger - Google Patents

Abstract

(57) [Abstract] [Purpose] The heat exchange tube 4 is surely secured in the connection hole 3 by determining the material of the header pipe 2 from the Vickers hardness rather than the tensile strength. Can be inserted. A header is provided with a heat exchange tube 4 through which a heat exchange medium flows, and a header pipe 2 made of aluminum in which a connection hole 3 into which the heat exchange tube 4 is inserted and connected is formed by press working. - heat exchange Ju by a pipe 2 - in the heat exchanger 1 for distributing or set the heat exchange medium flowing Bed 4, the header - the tensile strength of the pipe 2 at 160 N / mm ² or more 210N / mm ² of the following materials Is forming. As a result, the header pipe 2 having the proper connection hole 3 into which the heat exchange tube 4 can be inserted is formed.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to the strength of an aluminum material for a header pipe, which is a component of a heat exchanger, for example, a condenser of various air conditioners and a radiator for a vehicle.

[0002]

[Prior Art]

 A heat exchanger of this type shown in FIG. 1 is conventionally known.

In this heat exchanger 1, connection holes 3 are formed in header-pipes 2 facing each other at a predetermined interval with a vertical interval, and a flat heat exchange tube is provided through the connection holes 3. The cable 4 is connected. Further, heat exchange fins 5 are interposed between the heat exchange tubes 4, and between the heat exchange air passing between the heat exchange fins 5 and the heat exchange medium passing inside the header-pipe 2. It is designed to exchange heat.

The heat exchange fin 5 as described above uses a material having a high thermal conductivity, that is, an aluminum material, in order to perform its heat exchange effect well. On the other hand, since the header pipe 2, the heat exchange tube 4 and the heat exchange fins 5 are collectively brazed to assemble the respective members, these respective members are formed of the same material. Therefore, this header-pipe 2 is also made of aluminum.

As described above, the header-pipe 2 made of aluminum material is provided with the connection hole 3 as described above. However, as shown in FIG. The connection hole 3 is formed by the press work for placing.

[0006]

[Problems to be solved by the device]

 As described above, when the header pipe 2 is formed with the connection hole 3 by press working and the tensile strength of the header pipe 2 is sufficiently high, a perspective view of the header pipe 2 of FIG. As shown in, the header-pipe 2 is formed without significant deformation. Therefore, as shown in the sectional view of FIG. 4 (a) showing the inserted state of the heat exchange tube 4, the heat exchange tube 4 is fitted and assembled in the connection hole 3 accurately. On the other hand, when the hardness of the header pipe 2 is low, the header pipe 2 is deformed as shown in the perspective view of the header pipe 2 of FIG. 3B, and the heat exchange of FIG. 4B is performed. As shown in the sectional view showing the inserted state of the tube 4, the heat exchange tube 4 cannot be fitted into the connection hole 3.

Therefore, it can be considered that the material of the header pipe 2 is determined based on the Vickers hardness, and the connection hole 3 is bored in the header pipe 2. However, as shown in FIG. 5, with Vickers hardness of 49.4 HV and 56.7 HV, the header-pipe 2 is remarkably deformed, and the heat exchange tube 4 cannot be inserted into the header-pipe 2, while We have obtained experimental results that the heat exchange tube 4 can be inserted into the header pipe 2 when the hardness is 48.6HV, 53.3HV and 54.3HV, and when the Vickers hardness is between 48HV and 57HV. There was a problem that the normal and abnormal boundary values of the pipe 2 could not be obtained.

In view of the above-mentioned conventional problems, the object of the present invention is to obtain the material of the header pipe from the Vickers hardness, not to obtain it from the Vickers hardness. The purpose of the present invention is to provide a heat exchanger capable of reliably inserting the heat exchanger.

[0009]

[Means for Solving the Problems]

In order to solve the above problems, the present invention has an aluminum header pipe formed by pressing a heat exchange tube through which a heat exchange medium flows and a connection hole into which the heat exchange tube is inserted and connected. A heat exchanger that distributes or collects the heat exchange medium flowing in the heat exchange tube by the header pipe, and the tensile strength of the header pipe is 160 N / mm ² or more and 210 N / mm ² or more. It is characterized by being formed of ² or less materials.

[0010]

According to the present invention, the header - the tensile strength of the pipe is formed with 160 N / mm ² or more at 210 N / mm ² or less of the material, the header based on the tensile strength - and determines the material of the pipe . That is, when a connection hole is punched in the header-pipe, a shearing force of the punch acts on the header-pipe, and a bending action is applied in the pressing direction of the punch along with the shearing force to bend the periphery of the connection hole. Deform.

Here, when the tensile strength of the header-pipe is small, the deformation of the header-pipe is not restored and the header-pipe is formed in a deformed state. On the other hand, when the tensile strength of the header pipe is large, the deformation of the header pipe is restored and the deformation when forming the connection hole is small.

Therefore, it is most appropriate to select the material of the header-pipe based on the tensile strength.

[0013]

【Example】

 6 and 7 show examples of header-pipe material selection according to the present invention. FIG. 6 is a table showing the deformed state of the connection hole due to different tensile strengths, and FIG. 7 is the processing rate associated with rolling. It is the graph which displayed and tensile strength based on the curing curve. The header-pipe used in this embodiment is the same as that shown in FIGS. 1 to 5, that is, an aluminum material, A3003, and the description will be given based on this aluminum material.

As shown in FIG. 6, when the header-pipe is made of a material having a small tensile strength of 149 N / mm ² , 158 N / mm ² , the header-pipe is connected when the connection hole is formed. The bent portion formed around the hole is not restored and the heat exchange tube cannot be inserted due to the deformation of the header pipe. On the other hand, the header - tensile strength greatly 160 N / mm ² pipes, 182N / mm ^2, when to use a material of 206N / mm ^2, the header - and restored formed bent portion around the pipe, Appropriate connection holes are formed. As a result, the heat exchange tube is properly inserted into the header pipe.

Therefore, it can be seen that the lower limit of the tensile strength of the header-pipe is 160 N / mm ² .

As shown in FIG. 7, the processing limit of the header-pipe is generally 70% of the processing rate by rolling. Therefore, since the tensile strength corresponds to the processing limit is 2 10 mm ^2, the header - the upper limit of the tensile strength of the pipe that Do and 210 mm ^2.

As described above, by determining the tensile strength of the material of the header-pipe and setting the tensile strength of the header-pipe to 160 mm ² or more and 210 mm ² or less, the heat exchange tube is inserted. A proper connection hole that can be formed is formed.

[0018]

[Effect of the device]

As described above, according to the present invention, the material of the header pipe is required to have tensile strength, and the tensile strength is set to 160 mm ² or more and 210 mm ² or less, the heat exchange tube It has the advantage that a header-pipe is formed with the proper connection holes for insertion.

[Brief description of drawings]

FIG. 1 is an overall perspective view of a heat exchanger.

FIG. 2 is a perspective view showing a method of forming a connection hole.

FIG. 3 is a perspective view showing a state in which connection holes are provided.

FIG. 4 is a cross-sectional view showing a connection state of a heat exchange tube to a connection hole.

FIG. 5 is a table showing deformed states of connection holes based on different Vickers hardnesses.

FIG. 6 is a table showing deformation states of connection holes based on different tensile strengths.

FIG. 7 is a graph showing a processing rate and a tensile strength associated with rolling based on a hardening curve.

[Explanation of symbols]

1 ... Heat exchanger, 2 ... Header-pipe, 3 ... Connection hole, 4 ...
Heat exchange tube.

Claims (1)

[Scope of utility model registration request] 1. A header comprising a heat exchange tube through which a heat exchange medium flows, and an aluminum header pipe having a connection hole into which the heat exchange tube is inserted and connected and which is formed by press working. - in the heat exchanger to distribute or set the heat exchange medium flowing in blanking, said header - - heat exchange Ju by a pipe forming the tensile strength of the pipe at 210N / mm ² or less of the material at 160 N / mm ² or more A heat exchanger characterized by the above.