KR20040099497A - Heat Exchanger for an Air Conditioning System of a Car - Google Patents

Abstract

PURPOSE: A heat exchanger for a vehicle air conditioner is provided to form a header pipe by rolling a clad element instead of separately forming a header from a tank, thereby removing the joining between the header and the tank. CONSTITUTION: A heat exchanger for a vehicle air conditioner includes at least one or more first and second header pipes(112a,112b) disposed in parallel, to which a plurality of tubes(114) having flow channels for refrigerant inside is fixed at both ends. The first and second header pipes are in the oval shape by rolling a clad element like a track and joined together. The first and second header pipes are formed by semicircular headers(112a-2,112b-2) and tanks(112a-1,112b-1) having straight line parts and arc-shaped parts, and have flow channels for heat exchange media at a predetermined position inside. At least one or more reinforcement elements(111) are formed of the clad element and brazing-joined to predetermined positions outside the first and second header pipes.

Description

Heat Exchanger for Automotive Air Conditioning System

The present invention relates to a heat exchanger, and more particularly, by changing the structure of a tube and a header pipe, and providing a reinforcing member at a predetermined position outside the header pipe, to improve pressure resistance and durability, and to simplify parts. The present invention relates to a heat exchanger for an automotive air conditioner to reduce manufacturing costs.

The heat exchanger used in the air conditioner of an automobile is composed of a header pipe, a tube, a fin, and the like to heat exchange the heat exchange medium and the external air passing through the tube with each other. HFC refrigerants have been mainly used as a working medium of automotive air conditioner systems whose main components are heat exchangers. Recently, however, as HFC refrigerants are recognized as one of the main factors of global warming, regulations on their use are gradually expanding, and carbon dioxide (CO₂) is used as a heat exchange medium as a solution.

For example, according to the multi-stage heat exchanger according to the related art, as shown in FIG. 1, a pair of upper and lower headers 12a and lower headers (not shown) are brazed with the upper and lower headers. Between the upper tank (14a) and the lower tank (not shown), the tube 16 formed with a passage through which the upper and lower headers and both ends thereof and a heat exchange medium flows therein, and between the tubes (16) It is comprised by the pin 18 provided.

When the carbon dioxide is used as a heat exchange medium in the heat exchanger according to the prior art, the pressure is 5 to 6 times higher than the conventional refrigeration cycle (about 100 to 130 bar). Therefore, the thickness of the brazing plate, which is a material of the heat exchanger, becomes thick, and thus, a problem arises in that it is difficult to press-process the thick brazing plate.

The heat exchanger 10 according to the related art has a problem in that brazing reliability is lowered due to incomplete bonding of the header and the tank.

In addition, in the multi-stage heat exchanger according to the prior art, the space between the tube rows does not heat exchange, so that the heat exchange performance is deteriorated when the fin 18 provided between the tubes 16 and the upper and lower headers are large. There was a problem.

Accordingly, the present invention has been made in order to solve the problems described above, by forming the header pipe by rolling the brazing plate without separately manufacturing the header and the tank so as not to reduce the manufacturing cost and unnecessary joining of the header and the tank. Its purpose is to.

Another object of the present invention is to form a hole through which the heat exchange medium flows in a predetermined position on one side of the header pipes to achieve a flow passage of the heat exchange medium, and to improve the reliability of the brazing joint.

Another object of the present invention is to change the shape of the tube to minimize the waste space between the header pipe and the tube.

Figure 1 is an exploded perspective view showing a heat exchanger according to the prior art cut,

2 is a perspective view of a heat exchanger according to the present invention;

3 is a side view showing a tube of a heat exchanger according to the present invention,

Figure 4 is an exploded perspective view showing a part of the heat exchanger according to the first embodiment of the present invention cut away,

5 is a cross-sectional view taken along the line A-A according to FIG.

6 is a cross-sectional view of a heat exchanger according to a second embodiment of the present invention.

** Explanation of symbols for main parts of the drawing **

100 ... heat exchanger,

111 reinforcing member,

112a, 112b ... the first and second header pipes,

112a-1,112b-1 ... tube insertion hole,

113a, 113b ...

114 ... tube,

114a ...

114b ... Inserts.

In order to solve the above technical problem, a heat exchanger for a vehicle air conditioner of the present invention includes at least one first and second header pipes arranged in parallel; A plurality of tubes having both ends thereof fixed to the first and second header pipes, and a flow path of the refrigerant being provided at a predetermined position inside; In the multi-column heat exchanger comprising a fin provided between the tubes, the first and second header pipe is characterized in that the brazing material (Clad material) is rolled in a track shape to form an oval shape and mutual brazing.

Here, the first and second header pipes are characterized in that the semi-circular header and the tank having a straight portion and a circular arc made of a brazing material (Clad material) are mutually brazed to be opposed to each other.

In addition, a flow passage through which the heat exchange medium may flow is formed at a predetermined position of the first and second header pipes.

And at least one reinforcing member formed of a brazing material (Clad material) at a predetermined position outside the first and second header pipe is characterized in that the brazing is provided.

In addition, the tube is characterized in that a portion of the end portion forms an inclined surface, the insertion portion having a predetermined length in a linear direction from the inclined portion is formed.

Hereinafter, an embodiment according to the present invention will be described in detail with reference to the accompanying drawings.

Figure 2 is a perspective view of a heat exchanger according to the present invention, Figure 3 is a side view showing a tube of the heat exchanger according to the present invention, Figure 4 is a cutaway portion of the heat exchanger according to the first embodiment of the present invention 5 is a cross-sectional view taken along line AA of FIG. 4, and FIG. 6 is a cross-sectional view of a heat exchanger according to a second embodiment of the present invention.

That is, the heat exchanger 100 for a vehicle air conditioner according to the present invention includes at least one or more first and second header pipes 112a and 112b and parallel to the first and second header pipes. In the multi-column heat exchanger comprising a plurality of tubes (114) having both ends fixed and a flow path of the coolant at a predetermined position inside, and a fin (116) provided between the tubes, the first and second headers Pipe (112a) (112b) is characterized in that the brazing material (Clad material) is rolled into a track shape having a straight portion and an arc to form an oval shape and mutual brazing.

Meanwhile, as shown in FIG. 6, the first and second header pipes 112a and 112b are semicircular headers 112a-2 and 112b-2 having straight portions and arcs formed of a brazing material (Clad material). ) And the tanks 112a-1 and 112b-1 can be configured by brazing each other to face each other.

The flow paths 113a and 113b through which the heat exchange medium can flow are formed at predetermined positions of the first and second header pipes 112a and 112b. The multi-thermal heat exchanger can vary the configuration of the flow passage while reducing the size of the heat exchanger.

According to the heat exchanger 100 according to the present invention, the brazing plate is rolled into a substantially track shape to form a header pipe, and one side of each of the first and second header pipes 112a and 112b is directly brazed to each other. Brazing reliability can be improved. That is, during brazing, the brazing material (Clad material) is melted and filled in the concave portion between the first and second header pipes 112a and 112b, so that the wall surfaces between the flow passages 113a and 113b are firmly joined. Therefore, the pressure resistance is increased and the refrigerant flow between the header pipes 112a and 112b is smoothly performed. In addition, the flow passages 113a and 113b are formed at one side of each header pipe, so that the naked eye can directly check the position, thereby making it easy to adjust the position during brazing.

In addition, end caps (not shown) may be brazed to the ends of the header pipes 112a and 112b. At this time, the brazing joint strength is lowered due to factors such as external impact or shaking, and in order to reinforce this, at least one reinforcing member 111 may be provided at a predetermined position outside the header pipes 112a and 112b.

On the other hand, the tube 114 is characterized in that the insertion portion 114b having a predetermined length in a linear direction from the inclined portion and a portion of the end portion forms the inclined surface 114a. In the multi-thermal heat exchanger, the space between the header and the tube row is a space where no heat exchange occurs, so the heat exchange efficiency decreases by the space interval. Therefore, unlike the conventional technique of inserting a predetermined width of the insertion portion into the tube insertion hole formed in the header and brazing-joining, a portion D1 of the tube end portion forms an inclined surface 114a, and is predetermined in a linear direction from the inclined portion. By forming the insertion portion 114b having the length D2 of, the gap between the fins 116 provided between the header pipes 112a and 112b and the tubes 114 is reduced, thereby minimizing the factors that lower the heat exchange efficiency. You can do it.

Hereinafter, the operation according to an embodiment of the present invention in detail.

According to the heat exchanger 100 for an automobile air conditioner according to the present invention, in particular, in a heat exchanger using carbon dioxide (CO 2) as a refrigerant, the brazing plate is rolled into a substantially track shape and at least one or more first and second header pipes ( 112a and 112b, and the connection between the flow passages 113a and 113b formed at one side of the first and second header pipes 112a and 112b is connected to each of the first and second header pipes 112a and (b). 112b) by directly brazing each other.

Here, the first and second header pipes 112a and 112b are semicircular headers 112a-2 and 112b-2 having a straight portion and an arc formed of a brazing material (Clad material) and a tank 112a-1. ) 112b-1 may be configured by mutually brazing bonding to face each other.

Further, at least one reinforcing member 111 is provided at a predetermined position outside the first and second header pipes 112a and 112b to reinforce the inferior pressure resistance.

In addition, the interval between the header pipes 112a and 112b and the fins 116 is formed by forming a partial section of the end portion of the tube 114 as the inclined surface 114a and forming an insertion portion 114b connected to the inclined surface 114a. By reducing the heat exchange efficiency can be improved.

While the exemplary embodiments of the present invention have been described above by way of example, the scope of the present invention is not limited to the specific embodiments, and those skilled in the art are appropriate within the scope described in the claims of the present invention. It will be possible to change.

As described above, according to the heat exchanger for a vehicle air conditioner according to the present invention, by forming the header pipe by rolling the brazing plate without separately manufacturing the header and the tank, the effect of reducing the manufacturing cost and not causing unnecessary joining of the header and the tank. There is.

Another effect of the present invention is to form a hole through which the heat exchange medium flows in a predetermined position on one side of the header pipes to achieve a flow passage of the heat exchange medium, and improve the reliability of the brazing joint.

Another effect of the present invention is to change the shape of the tube to minimize the waste space between the header pipe and the tube.

Claims (5)

At least one or more first and second header pipes 112a and 112b disposed side by side; A plurality of tubes 114 having both ends fixed to the first and second header pipes, and a flow path of the refrigerant formed therein; A fin 116 provided between the tubes; In the multiple heat exchanger comprising: The first and second header pipes (112a) and (112b) are brazed materials (Clad materials) are rolled into a track shape having a straight portion and an arc to be brazed to each other. The method of claim 1, The first and second header pipes 112a and 112b are semi-circular headers 112a-2 and 112b-2 having a straight portion and an arc having a brazing material (Clad material) and a tank 112a-1 and 112b. Heat exchanger for automotive air conditioner, characterized in that -1) is brazed to each other facing each other. The method according to claim 1 or 2, And a heat passage (113a) (113b) through which the heat exchange medium can flow at a predetermined position of the first and second header pipes (112a, 112b). The method according to any one of claims 1 to 3, Heat exchanger for an automotive air conditioner, characterized in that at least one reinforcing member (111) formed of a brazing material (Clad material) is brazed at a predetermined position outside the first and second header pipes (112a, 112b). The method of claim 1, The tube 114, the vehicle air conditioning, characterized in that the insertion section 114b having a predetermined length (D2) in a linear direction from the inclined portion of the end portion of the section (D1) forms an inclined surface (114a) Heat exchanger for the device.