JP2001129658A - Heat exchanger amd brazing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat exchanger which can be brazed easily and surely and can improve work efficiency thereby and provide a brazing method therefor. SOLUTION: In a heat exchanger comprising mounting several members made of aluminum thereon and heating the mounted body is a furnace to form a united body with blazing, the brazing performed with brazing-fillers preplaced at junctions of the several members, which are formed according to the shape of the junctions. In addition, clearances are provided at the junctions to guide the preplaced brazing-fillers which are melt by means of the heating and the brazing-fillers possess volumes corresponding to those of the clearances.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a heat exchanger and a method for brazing a heat exchanger.

[0002]

2. Description of the Related Art Generally, as a heat exchanger used for a condenser, an evaporator, a radiator or the like of a vehicle air conditioner, a plurality of tubes and fins are alternately stacked, and header tanks communicate with both ends of the tubes. A connected parallel flow type, a serpentine type in which fins are arranged between meandering tubes, and the like are used.

In such a heat exchanger, a tube, a fin, a header tank and the like are formed by using an aluminum material clad with a brazing material on one side and both sides, and these members are assembled, and the assembled body is placed in a furnace. And then brazed together. Further, in order to improve the brazing property, a brazing device is disposed at a joint of a plurality of assembled members, and brazing is performed integrally.

Further, when an aluminum material which is not clad with a brazing material, that is, a bare material is used, a brazing is arranged at a joint of a plurality of assembled members, and a brazing operation such as a torch brazing is performed. I was brazing by work.

As this type of heat exchanger, for example, as in a method of manufacturing an aluminum alloy heat exchanger disclosed in Japanese Patent Application Laid-Open No. 9-47892, a clad is attached to a joined portion of a plurality of assembled members. There is a heat exchanger in which a brazing filler metal having a lower melting point than that of a brazing filler metal is disposed to improve brazing properties.

[0006]

In a heat exchanger, a plurality of members are assembled by brazing and joined together, and the airtightness of a passage through which a medium flows is ensured.

[0007] Such a heat exchanger, as described above,
Assemble a plurality of members clad with brazing material on one side and both sides, heat-treat this assembled body in a furnace, place a braze at the joint of the assembled plurality of members, and further, torch brazing, etc. Brazing is done manually.

However, in a heat exchanger in which a medium flows at a high pressure, the thickness of a member is increased in order to secure required pressure resistance. As described above, when the heat exchanger including the thick member is brazed by the conventional brazing method, the placed solder may be misaligned or may be melted by the heat treatment. And the brazing property was reduced.

Furthermore, in the case of manual work, there is a difference in brazing accuracy, work speed, and the like, depending on the skill of a worker who performs brazing. In addition, since it is a manual operation, it takes time and effort, and there is a disadvantage that work efficiency is poor.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a heat exchanger and a brazing method capable of easily and surely brazing and improving work efficiency. And

[0011]

According to the first aspect of the present invention, a plurality of aluminum members are assembled.
In a heat exchanger obtained by heat-treating the assembled body in a furnace and brazing integrally, the brazing is performed by arranging a brazing joint at the joint of the plurality of members, This is a heat exchanger formed by bending according to the joint. Here, “made of aluminum” includes an aluminum alloy, and the heat exchanger is formed by brazing such a plurality of members.

As described above, when the brazing is placed at the joint of the plurality of assembled members and brazing is performed, and furthermore, when the brazing is molded according to the joint, brazing can be performed easily and reliably. It becomes possible.

Particularly, in a heat exchanger in which a medium flows at a high pressure, as described above, in order to secure a required pressure resistance,
When a heat exchanger provided with a thicker member and having a thicker member is brazed by a conventional brazing method, if a placed braze is displaced or a braze melted by a heat treatment, a plurality of brazes may be formed. It is difficult to enter the joints of the members, and there is a disadvantage that the brazing property is reduced.Also, in the case of manual work, depending on the skill of the operator performing the brazing, the accuracy of brazing and the working speed etc. There is a difference, and furthermore, since it is a manual operation, it takes time and effort, and there is an inconvenience that the operation efficiency is poor. Is arranged at the joint portion, the displacement of the brazing filler metal is prevented, and the brazing melted by the heat treatment easily enters the joining portion, so that the brazing can be surely performed.

[0014] In addition, if a solder is placed at each of a plurality of joints of the heat exchanger, it is possible to perform brazing all at once. Therefore, since labor such as manual brazing can be omitted, work efficiency can be improved.

According to a second aspect of the present invention, in the first aspect, the joining portion is provided with a clearance for inducing a solder to be melted by the heat treatment, and a volume of the solder is set to the clearance. Is a heat exchanger corresponding to the volume of

As described above, the clearance for guiding the molten solder is provided at the joint, and the solder placed at the joint has a volume corresponding to the volume of the clearance provided at the joint. All of the brazing material can be guided to the clearance, and unnecessary brazing material can be omitted.

[0017] Although it may be melted by the heat treatment,
The situation of blocking the passage of the medium is avoided, and the reliability of brazing can be improved.

According to a third aspect of the present invention, in the first or second aspect of the present invention, the plurality of members include a tube through which a medium flows, and a hole into which an end of the tube is inserted. A header tank, wherein the joint is a heat exchanger that is an end of the tube and a hole of the header tank.

When a brazing filler metal molded in accordance with the joint is disposed at the joint formed by the tube through which the medium flows and the header tank provided with the hole for inserting the end of the tube, the joint is formed. Brazing can be performed easily and reliably.

Further, by securely brazing the end of the tube and the hole of the header tank, the airtightness of the passage through which the medium flows can be ensured.

According to a fourth aspect of the present invention, in the first to third aspects of the present invention, the plurality of members include a tube through which a medium flows, and a hole into which an end of the tube is inserted. A header tank and a cap for closing an opening of the header tank, wherein the joint is an opening of the header tank and a portion of the cap corresponding to the opening, and the cap has the This is a heat exchanger provided with a groove for mounting a wax.

In this manner, when the cap for closing the opening of the header tank is provided with the groove for mounting the wax,
The joint can be easily and reliably brazed.

Also, by securely brazing the header tank and the cap, the airtightness of the passage through which the medium flows can be ensured.

According to a fifth aspect of the present invention, there is provided a brazing method for a heat exchanger, comprising: assembling a plurality of members made of aluminum; The brazing is a brazing method for a heat exchanger in which a brazing is placed at a joint of the plurality of members, and the brazing is bent according to the joint.

As described above, when the brazing is performed by arranging the brazing member formed in accordance with the joining portion at the joining portion of the plurality of assembled members, the brazing is easy.

Also, since the brazing filler metal molded corresponding to the joint of the plurality of assembled members is arranged at the joint,
The displacement of the brazing is prevented, and although the brazing melted by the heat treatment, it is easy to enter the joining portion, and brazing can be surely performed.

[0027]

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

The heat exchanger 1 of this embodiment is used in a refrigerating device such as a vehicle air conditioner for circulating a refrigerant. As shown in FIG. 1, a plurality of tubes 2, 2 and fins 4, 4 are parallel. This is a parallel flow type heat exchanger formed by connecting header tanks 3 and 3 to both ends of these tubes 2 and 2 in a communicating state.

As shown in FIGS. 2 and 3, the header tank 3 of this embodiment is a hollow cylindrical pipe made of aluminum, and has a hole 3a for inserting the tubes 2 at predetermined intervals in the longitudinal direction. , 3a.

The hole 3 provided in the header tank 3
a and 3a are flat tubes 2 and 2 made of aluminum.
Are inserted, and brazing fillers 6, 6 are respectively arranged at the joint formed by the ends of the tubes 2, 2 and the holes 3a, 3a of the header tank 3. In this state, heat treatment is performed in a furnace and brazing is performed integrally.

The brazing material is not clad on the tubes 2 and 2 and the header tanks 3 and 3 of this embodiment, and is brazed only by the brazing fillers 6 and 6.

Although not shown, the joint is provided with a clearance for guiding the molten solder.

The brazing solders 6 and 6 are formed by bending corresponding to the joint formed by the tube 2 and the header tank 3. It is formed into a shape having the same diameter as the outer diameter. Each of the brazing fillers 6, 6 has a volume corresponding to the volume of the clearance provided at the joint.

In the present example, the brazing fillers 6, 6 are formed by press molding, but they may be formed by using a mold or the like.

As described above, since the tubes 2 and 2 and the header tank 3 are assembled and the brazing solders 6 and 6 formed corresponding to the joints are arranged, the tubes 2 and 2 and the header tank 3 can be easily connected. And brazing can be performed reliably.

When the volume of the brazing filler metal 6, 6 corresponds to the volume of the clearance provided at the joint, all the brazing filler metal melted by the heat treatment can be guided and stored in the clearance. The situation of blocking the passage of the medium can be avoided.

The specific examples shown in FIGS. 4 and 5 show the case where the openings 3b at the upper and lower ends of the header tank 3 are closed by aluminum caps 5. FIG. In this example, a groove 5a is provided in the cap 5, and a wax 6 is placed in the groove 5a.

As described above, the opening 3b of the header tank 3
The groove 5 for mounting the wax 6 on the cap 5 for closing the
By providing a, the header tank 3 and the cap 5 can be securely brazed, and the airtightness of the passage through which the medium flows can be ensured.

The volume of the brazing filler metal 6 corresponds to the volume of the clearance between the joint portion between the header tank 3 and the cap 5, but may be larger than the volume.

As described above, in the above-described specific example, since the brazing filler metal molded corresponding to the bonding part of the plurality of assembled members is arranged at the bonding part, the displacement of the brazing filler metal can be prevented, and the heating can be prevented. Although the brazing is melted by the treatment, the brazing easily enters the joint and can be reliably brazed.

Further, when a plurality of members are assembled and the assembled body is subjected to heat treatment in a furnace, a brazing filler metal is arranged at each of a plurality of joints and is brought into the furnace to collectively form a brazing material. Can be attached. Therefore, since labor such as manual brazing can be omitted, work efficiency can be improved.

[0042]

As described above, in the first aspect of the present invention, a plurality of members made of aluminum are assembled, and the assembled body is heat-treated in a furnace and brazed integrally. In the heat exchanger, the brazing is performed by arranging a brazing filler at a joint of the plurality of members, and the brazing is a heat exchanger formed by bending according to the joint.

As described above, when the brazing is placed at the joint of the plurality of assembled members and brazing is performed, and when the brazing is molded according to the joint, brazing can be easily and reliably performed. it can.

Particularly, in a heat exchanger in which a medium flows at a high pressure, the thickness of the members is increased in order to secure a required pressure resistance. Or in the case of manual work, it takes time and effort, there is a disadvantage that the work efficiency is poor, according to the present invention, according to the joint of a plurality of assembled members formed Since the brazing filler metal is arranged at the joint, the displacement of the brazing filler metal can be prevented, and the brazing melted by the heat treatment can easily enter the bonding part and be reliably brazed.

[0045] Further, if a brazing filler metal is placed at each of the plurality of joints of the heat exchanger, brazing can be performed at once. Therefore, since labor such as manual brazing can be omitted, work efficiency can be improved.

According to a second aspect of the present invention, in the first aspect, the joining portion is provided with a clearance for inducing a solder to be melted by the heat treatment, and a volume of the solder is set to be equal to the clearance. Is a heat exchanger corresponding to the volume of

As described above, the clearance for guiding the molten solder is provided at the joint, and the solder that is arranged at the joint has a volume corresponding to the volume of the clearance provided at the joint. All of the brazing material can be guided to the clearance, and unnecessary brazing material can be omitted.

Also, although it may have been melted by the heat treatment,
The situation of blocking the passage of the medium can be avoided, and the reliability of brazing can be improved.

According to a third aspect of the present invention, in the first or second aspect of the present invention, the plurality of members include a tube through which a medium flows, and a hole through which an end of the tube is inserted. A header tank, wherein the joint is a heat exchanger that is an end of the tube and a hole of the header tank.

When a brazing filler metal molded in accordance with the joint is disposed at the joint formed by the tube through which the medium flows and the header tank provided with a hole for inserting the end of the tube, the joint is formed. Brazing can be performed easily and reliably.

Further, by securely brazing the end of the tube and the hole of the header tank, the airtightness of the passage through which the medium flows can be ensured.

According to a fourth aspect of the present invention, in the first to third aspects of the present invention, the plurality of members include a tube through which a medium flows, and a hole into which an end of the tube is inserted. A header tank and a cap for closing an opening of the header tank, wherein the joint is an opening of the header tank and a portion of the cap corresponding to the opening, and the cap has the This is a heat exchanger provided with a groove for mounting a wax.

In this manner, when the cap for closing the opening of the header tank is provided with the groove for mounting the wax,
The joint can be easily and reliably brazed.

Further, by securely brazing the header tank and the cap, the airtightness of the passage through which the medium flows can be ensured.

According to a fifth aspect of the present invention, in the brazing method for a heat exchanger, a plurality of aluminum members are assembled, and the assembled body is heat-treated in a furnace and brazed together. The brazing is a brazing method for a heat exchanger in which a brazing is placed at a joint of the plurality of members, and the brazing is bent according to the joint.

As described above, brazing can be easily performed by arranging the brazing member formed according to the joining portion at the joining portion of the plurality of assembled members.

Further, since the brazing filler metal molded corresponding to the joint of a plurality of assembled members is arranged at the joint,
The displacement of the solder can be prevented, and the solder melted by the heat treatment can easily enter the joint and be reliably brazed.

[Brief description of the drawings]

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

FIG. 2 is a partial perspective view illustrating a main part of a heat exchanger according to a specific example of the present invention.

FIG. 3 is a partial perspective view showing a main part of a heat exchanger according to a specific example of the present invention.

FIG. 4 is a partial cross-sectional view showing a main part of a heat exchanger according to a specific example of the present invention.

FIG. 5 is a partial cross-sectional view showing a main part of a heat exchanger according to a specific example of the present invention.

[Explanation of symbols]

 1 heat exchanger 2 tube 3 header tank 4 fin 5 cap 6 put

Claims (5)

[Claims] 1. A heat exchanger in which a plurality of members made of aluminum are assembled, and the assembled body is heat-treated in a furnace and brazed integrally, wherein the brazing is performed at a joint of the plurality of members. The heat exchanger is characterized in that the soldering is carried out, and the soldering is bent in accordance with the joint. 2. The joint according to claim 1, wherein a clearance is provided for inducing the solder to be melted by the heat treatment, and a volume of the solder corresponds to a volume of the clearance. Heat exchanger. 3. The plurality of members include a tube through which a medium flows, and a header tank provided with a hole into which an end of the tube is inserted, and the joint includes an end of the tube and an end of the tube. The heat exchanger according to claim 1, wherein the heat exchanger is a hole of the header tank. 4. The plurality of members include a tube for flowing a medium, a header tank provided with a hole for inserting an end of the tube, and a cap for closing an opening of the header tank. The joint portion is an opening portion of the header tank and a portion of the cap corresponding to the opening portion, and the cap is provided with a groove portion for mounting the wax. 4. The heat exchanger according to any one of claims 1 to 3. 5. A brazing method for a heat exchanger, comprising: assembling a plurality of members made of aluminum; and heat-treating the assembled body in a furnace so as to integrally braze the plurality of members. A brazing method for a heat exchanger, wherein the brazing is performed by arranging the brazing at the joint, and the brazing is bent in accordance with the joint.