JP2003106787A - Heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat exchanger enabling to securely apply flux to a brazing part so as to provide stable brazing when a pin and bracket for forming a mounting part is integrally brazed on a main body side by using a flux brazing method. SOLUTION: The heat exchanger includes a bar shaped pin 131, and the bracket 132 formed of a plane material having a hole 132a for inserting the pin 131 with brazing material clad on a surface, and is formed by integrally brazing after the pin 131 is inserted so as to pass through the hole 132a of the bracket 132, and the bracket 132 is temporarily fixed to the header tank 110 or the core part 120. The brazing uses the flux. A groove 132b for passing in an insertion direction of the pin 131 is provided on a part where the pin 131 and the hole 132a abut each other, and the flux applied to the pin 131 and the bracket 132 is wet flux.

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 suitable for application to, for example, a condenser provided in a vehicle refrigeration cycle device.

[0002]

2. Description of the Related Art As a conventional heat exchanger, for example, Japanese Patent Laid-Open No.
The one disclosed in Japanese Patent Laid-Open No. 106992 is known.
As shown in FIG. 3, this relates to the structure of the bracket 130 with a pin that forms a mounting portion to the counterpart vehicle, and is capable of being integrally brazed after being temporarily fixed to the heat exchanger 100.

Specifically, here, the heat exchanger 100 is made of aluminum, and the pin 131 and the bracket 132 are also made of the same aluminum material. Then, a brazing material is clad on at least one surface of the bracket 132, and the pin 131 is press-fitted and fixed to the bracket 132.
In the state of 30, the heat exchanger 100 (header tank 110) is temporarily fixed, and the heat exchanger 100, the pin 131, and the bracket 132 are integrally brazed at one time.

As a result, the pin 131 and the bracket 13
It is not necessary to weld and join 2 in advance in a separate process, and the number of manufacturing steps can be reduced and the cost can be reduced. Further, by pressing the pin 131 into the bracket 132, a jig for temporary fixing is unnecessary.

[0005]

However, the above publication makes no mention of the flux during brazing. With the exception of vacuum brazing, which uses an expensive vacuum furnace and eliminates the need for flux, flux brazing generally uses flux.In this case, the state of flux application is a factor that affects brazing quality. Becomes

The bracket with pin 130 is used for the heat exchanger 10.
In the state where the heat exchanger 10 of the pin 131 and the bracket 132 is disposed in the vicinity of 0 and is brazed by applying flux by, for example, automatic spraying in a temporarily fixed state.
At the part on the 0 main body side, it is hidden from the outside, flux is difficult to be applied, and there is a possibility of causing brazing failure.

In view of the above problems, an object of the present invention is to reliably apply flux to a brazing portion when integrally brazing a pin and a bracket forming a mounting portion to a main body side by using a flux brazing method. Another object of the present invention is to provide a heat exchanger that enables stable brazing.

[0008]

The present invention employs the following technical means in order to achieve the above object.

According to the first aspect of the present invention, a core portion (120) formed by laminating a plurality of tubes (122) through which a fluid flows, and a tube (122) disposed at both ends in the longitudinal direction of the tube (122). 122), a header tank (110) communicating with the inside, a rod-shaped pin (131) attached to a predetermined attachment portion, and a flat plate material having a hole (132a) into which the pin (131) is inserted, A bracket (132) having a brazing material clad on its surface, and a pin (13
1) is inserted so as to penetrate through the hole (132a) of the bracket (132), and after the bracket (132) is temporarily fixed to the header tank (110) or the core part (120), the header tank (110) and the core In the heat exchanger in which the part (120), the pin (131) and the bracket (132) are brazed together, brazing is flux brazing using flux, and the pin (131) and the hole (132a) are A groove (132b) penetrating in the insertion direction of the pin (131) is provided at the abutting portion, and the flux applied to the pin (131) and the bracket (132) is a wet flux.

As a result, the wet flux applied from the outside of the pin (131) and the bracket (132) passes through the groove (132b) due to the capillary phenomenon and is outwardly caused by the header tank (110) and the core portion (120). Since it reaches all the way to the hidden part, stable brazing is possible.

In the second aspect of the invention, the groove (132
b) is characterized in that a plurality of pins (131) or holes (132a) are provided in the circumferential direction.

As a result, the flux can be effectively applied to the portion hidden from the outside.

In the invention described in claim 3, the groove (132
b) is a hole (1) out of the pin (131) and the hole (132).
It is characterized in that it is provided on the side of 32a).

Thus, rather than forming the groove (132b) in the rod-shaped pin (131), the bracket (132)
Since the groove (132b) can be formed at the same time when the hole (132a) is processed, the cost can be reduced.

The reference numerals in the parentheses of the above means indicate the correspondence with the concrete means described in the embodiments described later.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION (First Embodiment) A first embodiment of the present invention is shown in FIGS. Here, the heat exchanger is applied to the condenser 100 that condenses and liquefies the refrigerant in the automobile refrigeration cycle apparatus. First, the overall configuration will be described with reference to FIG.

The condenser 100 is composed of a core portion 120, left and right header tanks 110, a liquid receiver 140, a bracket 130 with a pin forming a mounting portion on the vehicle side, and the like, and each member is made of aluminum or aluminum alloy. , Fitting, crimping, jig fixing, etc.
It is integrally brazed by a brazing material provided on the surface of each member in advance.

The core portion 120 is formed by alternately stacking a plurality of fins 121 and tubes 122, and is a side plate as a strength member having a U-shaped cross section outside the upper and lower outermost fins 121. 123 is assembled and brazed together.

Header tanks 110 extending in a direction intersecting the longitudinal direction are provided at the left and right portions of the core portion 120, that is, at both longitudinal end portions of the plurality of tubes 122. A tube hole is bored in the header tank 110, each end of the tube 122 is fitted into the tube hole, and the tube 122 and the header tank 110 are brazed so as to communicate with each other. In addition, here, the header tank 110 is a cylindrical container body in which plates having a crescent-shaped cross section are fitted together at their ends. A lid 113 that is recessed inward is brazed to the opening at the end of the header tank 110 in the longitudinal direction so as to close the opening. Further, separators 114a to 114e that partition the space in the tank are brazed in each header tank 110. And
An inlet joint 1 is provided on the right side of the header tank 110.
15, the outlet joints 116 are brazed to the lower side of the header tank 110 on the left side, respectively.
It communicates with the outside of 10.

The liquid receiver 140 has a cylindrical container body and is brazed to the header tank 110 on the right side. The communication hole 14 is formed so as to sandwich the separator 114c.
1, 142 are provided so that the inside of the right-side header tank 110 and the liquid receiver 140 communicate with each other.

The inlet joint 115 is connected to the discharge side of a compressor (not shown), and the outlet joint 116 is connected to an expansion valve (not shown). The refrigerant discharged from the compressor is supplied from the inlet joint 115 to the header tank 11
0, and repeats U-turns in the core part 120 to flow, and is heat-exchanged with the external air to be condensed and liquefied. Further, this refrigerant flows into the liquid receiver 140 through the communication hole 141, is separated into gas and liquid, and the liquid-phase refrigerant is discharged from the communication hole 142 into the core portion 1 at the lowermost stage.
It is supercooled at 20, and flows out from the outlet joint 116. Incidentally, a desiccant and a filter (not shown) are provided inside the liquid receiver 140, so that water and foreign substances in the refrigerant are removed.

Then, the lids 113 of both header tanks 110
A pin-equipped bracket 130 composed of a pin 131 and a bracket 132 is brazed to the outside of the to form a mounting portion of the condenser 100 on the vehicle side. In the present invention, the structure of the bracket with a pin 130 is characterized, and its details will be described below with reference to FIG.

First, the pin 131 is a rod-shaped pin portion 131.
a, a disk-shaped head 131b, and a hollow portion 131c whose inside is hollow on the head 131b side. On the other hand, the bracket 132 is made of a flat plate material in which a brazing material is clad on the front and back surfaces in advance.
A hole 132a into which a is inserted, a plurality of grooves 132b provided in the circumferential direction of the hole 131a and extending through in the insertion direction of the pin portion 131a, and a claw 132c for caulking the header tank 110 and the lid 113. And are formed.

The pin 131 has a hole 13 in the bracket 132.
2a so that the head 131b penetrates the bracket 13
(Until abutting 2), the hollow portion 131c is expanded and crimped to the bracket 132 to form the bracket 130 with a pin. Furthermore, the head 1 of the pin 131
31b is arranged so as to be inserted into the dent portion of the lid 113, and the bracket 13c with the pin is provided by the claw 132c.
0 is crimped on the header tank 110 and the lid 113. At this time, the end portion 132d of the bracket 132 is brought into contact with the side plate 123, and in this posture, the respective members are integrally brazed.

The brazing condition of the bracket 130 with pins will be described in detail below.
2, the head 131b and the contact surface of the bracket 132 are first brazed, and the hole 132 of the bracket 132
The pin portion 131a is brazed at the circumferential portion on the opposite head side of a. Next, the bracket with pin 130 itself is brazed on the contact surface between the lid 113 of the header tank 110 and the side plate 123 of the core portion 120.

Next, a method of manufacturing the condenser 100 will be briefly described.

First, a plurality of fins 121 and tubes 122 are alternately laminated, a side plate 123 is set further outside the upper and lower outermost fins 121, and the shape of the core portion 120 is held by a wire jig or the like. .

Next, the separators 114a to 114e are set inside the header tank 110, and the header tank 110 is fitted and assembled to the end portion of the tube 122. A lid 113 is press-fitted and assembled to the end portion of the header tank 110 in the longitudinal direction. Further, the inlet joint 115 and the outlet joint 116 are fitted and assembled to the respective header tanks 110. Furthermore, the receiver tank 14 on the right side has a receiver 14
0 is assembled and temporarily fixed with a predetermined jig.

Further, the bracket 130 with a pin is caulked to the header tank 110 and the lid 113 to be temporarily fixed. Thus, the assembly of the condenser 100 is completed.

Next, the above assembly is brazed. Here, flux brazing using flux is used, and more specifically, nocolock brazing using non-corrosive flux is used. Flux is applied to the contacting parts of the members or the fitting parts. Further, the flux used here is a powdery flux in consideration of maintaining a clean environment in the assembly line, and the core part 120, the header tank 110, the liquid receiver which are the main parts of the assembly body. 140
Apply to. On the other hand, the bracket 130 with a pin is a liquid flux (wet flux), and is applied mainly from the direction B in FIG. 2A. (4 places)
Then, the assembly coated with the flux as described above is put into the brazing furnace, and all the abutting parts by fitting or caulking of the members constituting the assembly are brazed at one time to obtain a product. The condenser 100 is completed.

Next, the function and effect of the present invention will be described.

The condenser 100 has a bracket 130 with a pin.
It is attached to the rear of the vehicle grill (not shown) via. The refrigerant in the refrigeration cycle device (not shown) is the condenser 10
0 as described above by condensing liquefaction, gas-liquid separation,
Supercooled.

By the way, by brazing, the lid 113 of the header tank 110 and the side plate 12 of the core portion 120.
The bracket with a pin 130 joined to 3 is required to have a stable brazing state to withstand a vibration load when the vehicle is traveling. One of the factors that determines the quality of brazing is the state of flux application.

In the prior art, the lid 113 and the bracket 13
It was difficult to apply flux from the outside to the head 131a side of the pin 131 that is sandwiched between two and hidden from the outside, but in the present invention, the flux is wet,
Since the groove 132c is provided, the flux applied from the outside of the pin 131 and the bracket 132 reaches the head 131b side of the pin 131 through the groove 132b due to the capillary phenomenon, and stable brazing is achieved. It will be possible.

Further, since the plurality of grooves 132b are provided, the flux can be effectively applied.

Further, since the groove 132b is provided on the circumference of the hole 132a of the bracket 132, the pin 1
Bracket 132 rather than forming groove 132b in 31
Since the groove 132b can be formed at the same time when the hole 132a is processed, the cost can be reduced.

(Other Embodiments) The number, width, and depth of the grooves 132b may be set according to the flowability of the wet flux. Further, the groove 132b may be provided on the pin 131 side.

In the first embodiment, the condenser 100 is described as an example of the heat exchanger, but other heat exchangers may be applied to a radiator, a heater core or the like. Further, the material of each member constituting the heat exchanger is not limited to aluminum, but other stainless material, copper material or the like may be used.

[Brief description of drawings]

FIG. 1 is a front view showing an entire condenser according to a first embodiment of the present invention.

2 (a) is an enlarged sectional view of a portion A in FIG.
(B) is an arrow view from the B direction of (a).

3A is a front view and FIG. 3B is a side view showing a main part of a conventional heat exchanger.

[Explanation of symbols]

100 condenser (heat exchanger) 110 header tank 120 core 122 tubes 131 pin 132 bracket 132a hole 132b groove

Claims (3)

[Claims] 1. A plurality of tubes (12) through which a fluid flows.
And a core part (120) formed by stacking 2), and arranged on both ends in the longitudinal direction of the tube (122),
Header tank (1) communicating with the inside of the tube (122)
10) and a rod-shaped pin (131) attached to a predetermined attachment part
And a bracket (132) made of a flat plate material and having a hole (132a) into which the pin (131) is inserted, and a brazing material clad on the surface thereof, the pin (131) being the bracket (132). 132) so as to penetrate through the hole (132a), and the bracket (132) is temporarily fixed to the header tank (110) or the core part (120), and then the header tank (110), A heat exchanger in which a core part (120), the pin (131), and the bracket (132) are integrally brazed, wherein the brazing is flux brazing using a flux, and the pin (131) and the A groove (132b) penetrating in the insertion direction of the pin (131) is provided at a portion in contact with the hole (132a). The flux is applied serial to the bracket (132) is a heat exchanger, characterized in that the wet flux. 2. The groove (132b) is provided with the pin (13).
1) Or the heat exchanger according to claim 1, wherein a plurality of holes are provided in the circumferential direction of the hole (132a). 3. The groove (132b) is provided with the pin (13).
The heat exchanger according to claim 1 or 2, wherein the heat exchanger is provided on the hole (132a) side of 1) and the hole (132).