KR20000034194A - Evaporator - Google Patents

Abstract

PURPOSE: An evaporator is provided to enhance productivity by simplify the connecting structure between inlet and outlet paths of front and rear heat exchangers. CONSTITUTION: A refrigerant is introduced into an upper tank of a front heat exchanger(2) through an inlet pipe and flows into the lower portion through a first row tube(31). The refrigerant exchanges heat and is introduced into a rear heat exchanger(3) via a connecting unit. Then, the refrigerant flows into the upper portion through a second row tube(32) and into the upper tank. The refrigerant flows into the lower portion and into the front heat exchanger via a connecting unit combined to the lower tank. Finally, the refrigerant is discharged to a compressor through an outlet pipe after exchanging heat.

Description

evaporator

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchanger for exchanging a refrigerant in an automotive air conditioner, and more particularly to an evaporator having an improved connection passage structure of a refrigerant flowing through a plurality of heat exchangers.

Recently, double heat exchangers are widely used in automobile air conditioners. The double heat exchanger is coupled to a single head such as Japanese Patent Application No. 62-34659, Japanese Patent Application No. 63-154962, and Japanese Patent Application Laid-Open No. Hei 4-189. Inlet pipes and outlet pipes connected to the passages and coupled to the headers, respectively, and the inlet and outlet passages are respectively located in front and rear rows with respect to the air flow direction for each heat exchanger.

Such a heat exchanger performs heat exchange with air circulating between the tubes while the refrigerant flows through the refrigerant circuit constituted by the tube group, and is configured to be ultra-thin so that the heat exchange efficiency is excellent.

However, the above-described compound heat exchanger has a complicated connection structure between the inlet and the outlet passages formed in the front and rear heat exchangers, which increases the number of parts and thus decreases the assembly and productivity.

The present invention has been made in view of this point, and an object of the present invention is to provide an evaporator which can improve the assembly and productivity by simplifying the connection structure between the inlet and outlet passages of the front and rear heat exchangers.

In order to achieve the above object, the present invention provides a plurality of tubes arranged in parallel and at the same time a fin is disposed between adjacent tubes, and a plurality of heat exchangers connected at both ends of each tube connected to a pair of header tanks in the air flow direction. And a heat exchanger having communication means for communicating at least one or more places in which the header tank of the heat exchanger, which is arranged before and after, and communicates with the refrigerant tank, wherein the communication means is a constant to allow the refrigerant to flow to the side of the third tank. A burr having a cross-sectional shape is formed, and a burr of the first heat tank and a burr of the same type are projected to correspond to the side of the fourth tank, and the pipe connected to the inner circumferential surface of the burr of the third tank and the burr of the fourth tank. It is characterized in that the end of the brazed coupling is inserted.

According to this configuration, in forming a refrigerant circuit by means of communication means of a plurality of heat exchangers arranged back and forth with respect to the air flow direction, each of the burrs formed to face each other in the tank of the heat exchanger lower tank to form a refrigerant By constructing the circuit, assembly is easy at the time of brazing, and the manufacturing is simple because of the simple shape.

1 is a schematic perspective view showing an evaporator according to the present invention,

2 is a cross-sectional view taken along line A-A of FIG. 1 showing a tank communication means according to the first embodiment of the present invention;

3 is a cross-sectional view showing a second embodiment of the present invention;

4 is a sectional view showing a third embodiment of the present invention.

* Description of the symbols for the main parts of the drawings *

1; evaporator 2; electrothermal heat exchanger

3; after heat exchanger 10; upper tank

20; lower tank 21; header

21a; first header portion 21b; second header portion

21c; connector 22; third tank

23; fourth tank 22a; mail bearer

23a; Female Bear 30; Tube

40; corrugated pin

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Figure 1 shows a plurality of extruded tube type evaporator according to the present invention, Figure 2 is a cross-sectional view of the main part of the present invention showing the refrigerant connection passage of the present invention. The evaporator 1, denoted by the numeral 1, is arranged back and forth with respect to the air flow direction in a mutually symmetrical form consisting of the front heat exchanger 2 and the after heat exchanger 3.

The evaporator 1 is composed of an upper tank 10 and a lower tank 20 which are installed to be spaced apart from each other in the upper and lower parts, and they are made of the same structure.

The lower tank 20 (or upper tank) is divided into a header 21 and tanks 22 and 23 to form a refrigerant passage by mutual coupling. A plurality of tubes 30 are coupled between the upper and lower tanks 10 and 20, and corrugated fins 40 are interposed between the tubes as a means for widening the heat transfer area of the refrigerant. In addition, the upper tank 10 is coupled to the inflow pipe 50 and the outflow pipe 51, respectively, into and out of the refrigerant.

The tube 30 is made of aluminum, and a plurality of flow paths are formed therein, and the corrugated fin 40 is made of aluminum and has a same width as the tube 30 and is brazed.

The lower tank 20 (or the upper tank) is combined with one header 21 and a pair of first and second tanks 22 and 23, and the header 21 connects the connection portion 21c formed at the center thereof. It is composed of a first header portion 21a and a second header portion 21b extending to both sides with a center. The cross sections of the first and second header portions 21a and 21b are arcuate shapes, respectively, and the connecting portions 21c are formed by bending the raw materials thereof.

Tube coupling holes 21d and 21e are formed in the bottom surfaces of the first and second header parts 21a and 21b, and the first and second row tubes 31 and 32 are formed through the coupling holes. The ends of are respectively joined. The first tank 22 and the second tank 23 forming a passage of the refrigerant are coupled to the upper portions of the first and second header parts 21a and 21b, so that they are coupled to the header 21. It is arc-shaped.

In order to couple the heat exchanger configured as described above, the tube 30 having one or more rows is coupled to the coupling holes formed in the bottom surface of the header 21, respectively. Then, the third tank 22 and the fourth tank 23 are in contact with the inner surface of the header 21 around the connecting portion 21c of the header 21.

That is, the outer circumferential surfaces of the third and fourth tanks 22 and 23 come into contact with the inner surfaces of the first and second header portions 21a and 21b around the connecting portion 21c of the header 21, respectively. Then, the header 21 and the tanks 22 and 23 are coupled to each other through a brazing process to form a passage of the refrigerant.

In the present invention, since the configuration of the header 11, the first tank 12, and the second tank 13 constituting the upper tank 10 is the same, a description thereof will be omitted.

In addition, the refrigerant flows through the communication unit connecting the third tank 22 and the fourth tank 23 of the refrigerant to the pre-heat exchanger 2 and the post-heat exchanger 3, and the upper and lower tanks 10 The installation location is determined by the baffles which are not shown in figure 20 installed inside.

Figure 2 shows a first embodiment of the communication means, the communication means from the arc surface of the third tank 22 and the fourth tank 23 forming the lower tank 20 located below the evaporator. The first and second burrs 22a and 23a of the same shape are opposed to each other and integrally protrude from each other, and have a circular cross section.

Then, between the first and second burrs 22a and 23a, a connection pipe 24 of the same type is inserted into the inner circumferential surface and brazed.

A pair of communication means for connecting the path of the refrigerant flowing through the front and rear heat exchanger (2) (3) is provided, according to the embodiment communication means is formed in the lower tank 20, but the refrigerant flow path is partitioned Since the location is determined by the number or location of the baffles or the engagement position of the inlet and outlet pipes, the installation location of the communication means is not limited.

As an example, when the inlet and outlet pipes 50 and 51 are coupled to the lower tank 20, it is obvious that the communication means should be installed in the upper tank 22.

According to the present invention configured as described above, the tube 30, the corrugated fin 40, and the upper and lower tanks 10 and 20 are temporarily coupled as in the conventional method, and in particular, when the lower tank 20 is temporarily coupled. And insert both ends of the connecting pipes 24 into the inner circumferential surfaces of the first and second burrs 22a and 23a respectively formed in the third and fourth tanks 22 and 23, respectively, and then couple the end portions of the connecting pipes 24, and then braze them in a high-temperature furnace. It will be prepared.

FIG. 3 shows a second embodiment of the communication means, similarly to the first embodiment, a third tank 22 and a fourth tank 23 forming the lower tank 20 of the evaporator 1. Square first and second burrs 22a and 23a are respectively integrally protruding from the circular arc surface of the arc and the ends thereof are in contact with each other.

Then, the outer circumferential end of the first and second burrs 22a is surrounded by the flange 25 to be brazed.

Figure 4 shows a third embodiment of the communication means, the refrigerant hole on the upper surface of the arc of the third tank 22 and the fourth tank 23 forming the lower tank 20 of the evaporator (1) (22a) (23a) are formed, respectively, and are communicated with each other via the block 26 which penetrated the center between the said refrigerant holes 22a, 23a.

The block 24 is generally made of aluminum having an enclosure shape and has a bottom surface of the same shape as the arc surface of the third and fourth tanks 22 and 23, and a flow path hole communicating with the refrigerant holes 22a and 23a, respectively. The injection molding 26a is made to penetrate, and is joined to the third and fourth tanks 22 and 23.

In this state, when brazing in a high-temperature furnace, the cladding temperature lower than that of the aluminum base material is melted so that the parts contacting the third and fourth tanks 22 and 23 are combined to maintain airtightness.

In this evaporator, the present invention is a lower tank after the heat exchanged while the refrigerant flowing into the upper tank 10 of the total heat exchanger (2) through the inlet pipe 50 flows downward through the first heat tube (31) It is introduced into the after heat exchanger (3) via a communication means connecting the (20). The refrigerant introduced into the after heat exchanger (3) flows upward through the second heat tube (32), flows to the upper tank (10), and then flows downward again, and the refrigerant flowing downwards is lower tank (20). Refrigerant flow flowing out to the compressor (not shown) through the outlet pipe 51 coupled to the upper tank 10 after being heated to the heat exchanger (2) through the other communication means coupled to the heat exchanger and flows upwards You have a path.

As described above, in the present invention, the refrigerant flow path of the evaporator consisting of the pre-heat exchanger and the post-heat exchanger is in communication with each other, thereby reducing the number of parts in a structure in which a burr is formed to face the tank of each heat exchanger so that the ends thereof are combined. At the same time, it is easy to assemble, thereby improving productivity.

Claims (3)

A plurality of tubes are arranged in parallel and a fin is arranged between adjacent tubes, and both ends of each tube communicate with a pair of header tanks, and a plurality of heat exchangers connected to each other are arranged back and forth in the air flow direction. In a heat exchanger having a communication means for communicating at least one place of the header tank of the heat exchanger in order to flow the refrigerant, The communicating means protrudes a burr having a constant cross-sectional shape through which refrigerant can flow on the side of the third tank, and protrudes a burr of the same type as the bur of the first heat tank on the side of the fourth tank. Evaporator, characterized in that the end of the connecting pipe is inserted into the inner circumferential surface of the burr of the third tank and the burr of the fourth tank is brazed. The method of claim 1, wherein the communication means protrudes a burr having a constant cross-sectional shape through which the refrigerant can flow on the side of the third tank, the side of the fourth tank corresponding to the bur of the third tank and the same type of burr. And a brazing coupling surrounding the end of the outer circumferential surface of the burr of the third tank and the burr of the fourth tank with a flange. The method of claim 1, wherein the communication means is formed in the upper flow path through which the refrigerant flows in the third tank, the upper flow path hole corresponding to the flow path hole of the third tank in the fourth tank, Evaporator, characterized in that the braided block having a flow path of the third tank and the refrigerant flow path communicating with the flow path of the fourth tank.