JPH0914886A - Duplex heat exchanger - Google Patents

Abstract

(57) [Abstract] [Purpose] In a double heat exchanger in which a plurality of heat exchangers 11 and 12 are arranged side by side in the air ventilation direction A, a structure of a refrigerant passage connecting portion between a plurality of heat exchangers is provided. Keep it small and compact. [Structure] The first and second tubular portions 25a and 25b and the first and second tubular portions 25a and 25b are provided in a connection block body 25 that connects a refrigerant passage between adjacent header tanks 17 and 18 of a plurality of heat exchangers 11 and 12. And a main body portion 25c that communicates the refrigerant passage between the two tubular portions 25a and 25b. The first and second tubular portions 25a and 25b and the main body portion 25c are formed by integrally molding a metal such as aluminum, and the first tubular portion 25a is directly connected to the communication hole portion 26 provided in the header tank 17. The second tubular portion 25b is directly joined to the communication hole portion 27 provided in the header tank 18 by brazing.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a plurality of heat exchangers,
The present invention relates to a multiple heat exchanger arranged side by side in the air ventilation direction, and more particularly to an improved structure for making a medium passage connecting portion between a plurality of heat exchangers compact and simple.

[0002]

2. Description of the Related Art Conventionally, as this type of double heat exchanger, there is one disclosed in Japanese Patent Application Laid-Open No. 3-84395, and in this publication, a plurality of heat exchangers are arranged side by side in the air ventilation direction. In order to connect the medium passages between the heat exchangers, the male connection block body is joined to one of the adjacent header tanks of the plurality of heat exchangers, and the female connection block body is joined to the other header tank. ing.

Then, by fitting the fitting projection provided on the male type connection block body into the fitting hole provided on the female type connection block body, a space between adjacent header tanks of a plurality of heat exchangers is obtained. Medium passage (for example, refrigeration cycle refrigerant passage)
I am trying to connect. Further, the mechanical connection between the both connection block bodies is performed by screwing with bolts.

[0004]

However, in the above-mentioned conventional structure, screwing with a bolt and a fitting portion between the fitting projection and the fitting hole are mechanically connected to each other for mechanically connecting the both connection block bodies. There is a problem that a structure for sealing with a sealing member such as a ring is required, the structure for connecting the medium passages between the plurality of heat exchangers becomes complicated, and the manufacturing cost increases.

The present invention has been made in view of the above points,
An object of the present invention is to provide a dual heat exchanger having a simple structure for connecting medium passages between a plurality of heat exchangers.

[0006]

In order to achieve the above object, the present invention employs the following technical means. In the invention according to claim 1, a plurality of tubes (2
1), the fins (22) arranged between the plurality of tubes (21), and a pair of header tanks (17, 19) for communicating one end and the other end of the plurality of tubes (21) with each other. ) (18, 20), a plurality of heat exchangers (11, 12) in the air ventilation direction (A) are arranged side by side in the duplex heat exchanger (10). The connection block body (2) has a connection block body (25) for connecting the medium passages between the adjacent header tanks (17, 18) of the vessels (11, 12).
5) is the first connected to one header tank (17)
Of the first tubular portion (25a), the second tubular portion (25b) connected to the other header tank (18), and the medium passage between the first and second tubular portions (25a) (25b). It has a structure in which the main body (25c)
The first tubular portion (25a) communicates with the communication hole portion (26) of the one header tank (17), and the second tubular portion (25b) communicates with the other header tank (18). The double heat exchanger is directly joined to each of the holes (27).

According to a second aspect of the present invention, in the duplex heat exchanger according to the first aspect, the connection block body (25).
The main body (25c) is provided with an opening (25d), and the opening (25d) is closed by a lid member (25e). According to a third aspect of the invention, in the double heat exchanger according to the second aspect, in the main body portion (25c) of the connection block body (25), the opening (25d) has the first and second openings. The main body portion (25) of the connection block body (25) is provided at a portion facing the tubular portions (25a, 25b).
c) and the first and second tubular parts (25a, 25b)
And are formed as an integrally molded product by molding.

According to a fourth aspect of the present invention, in the double heat exchanger according to any one of the first to third aspects, the first tubular portion (25a) and the second tubular portion (25).
b) is directly joined to the communication hole portions (26, 27) by brazing. Claim 5
In the described invention, in the multiple heat exchanger according to any one of claims 1 to 4, the plurality of heat exchangers (1
Part (B) of the adjacent header tanks (17, 18) of (1, 12) are arranged so as to be in direct contact with each other in the air ventilation direction, and the header tanks (17, 18) are in this direct contact portion (B). It is characterized in that they are joined together.

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

[0010]

According to the inventions of claims 1 to 5,
Due to having the above technical means, it is possible to connect the medium passages between the adjacent header tanks of the plurality of heat exchangers with one connection block body formed of an integrally molded product,
Moreover, since this one connection block body is directly joined to the communication holes of both header tanks by brazing or the like, a screwing structure using bolts and a sealing structure using a sealing material as in the conventional structure are required. Therefore, the medium passage connecting portion can be made extremely small and simple.

Further, the productivity of assembling the heat exchanger can be improved by eliminating the screwing work. In addition to the above, in the invention according to claim 3, in the main body portion of the connection block body, an opening is provided at a portion facing the first and second tubular portions,
Since the main body portion of the connection block body and the first and second tubular portions are integrally formed by molding, there is no need to cut the connection block body, and the material cost and processing cost of the connection block body Can be significantly reduced.

Further, according to the present invention, a part of the header tanks adjacent to each other of the plurality of heat exchangers are arranged so as to be in direct contact with each other in the air ventilation direction, and the direct contact portion header tanks are joined together. Therefore, the overall size of the double heat exchanger in the ventilation front-back direction can be minimized.

[0013]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. (First Embodiment) FIGS. 1 and 2 show a first embodiment, in which the present invention is applied to an indoor heat exchanger of a heat pump type air conditioner for an electric vehicle. This indoor heat exchanger is installed in a ventilation casing (not shown) of an air conditioner, and acts as a refrigerant evaporator during summer cooling to cool blast air,
During heating in winter, it acts as a refrigerant condenser to heat the blown air.

The duplex heat exchanger 10 of this example has two heat exchangers 11 and 12 arranged side by side in the front and rear in the ventilation direction A of the conditioned air. Here, of the two heat exchangers 11 and 12, the heat exchanger 11 located on the upstream side in the ventilation direction A is the heat exchanger on the refrigerant outlet side having the refrigerant outlet pipe 13, and is the downstream side in the ventilation direction A. The heat exchanger 12 located on the side is a refrigerant inlet side heat exchanger having a refrigerant inlet pipe 14.

Both heat exchangers 11 and 12 have the same structure, and the specific structure will be described below. The both heat exchangers 11 and 12 are cores 1 that perform heat exchange between air and refrigerant.
5, 16 and the first header tanks 17 and 18 and the cores 15 and 1 arranged on one end side of the cores 15 and 16 in the horizontal direction.
Second header tank 1 arranged on the other end side in the horizontal direction of 6
9 and 20, etc., all of these components are made of aluminum and are integrally brazed in a furnace.

The cores 15 and 16 are composed of a plurality of tubes 21 extending horizontally and arranged in parallel, and corrugated fins 22 arranged between the tubes 21, which are joined by joining means such as brazing. ing. The plurality of tubes 21 are made of aluminum or an aluminum alloy material and have a flat cross-sectional shape, and a refrigerant passage is formed therein.

The first header tanks 17 and 18 have a substantially cylindrical shape extending in the vertical direction, and one ends of the plurality of tubes 21 communicate with each other. Further, the internal space of the first header tanks 17 and 18 is vertically divided into two spaces by partition plates 23 and 24. And
A refrigerant outlet pipe 13 is connected to the lower space of the first header tank 17 of the heat exchanger 11 on the upstream side of the air so that the refrigerant in the header tank 17 flows out to the outside. Also,
A refrigerant inlet pipe 14 for allowing a refrigerant to flow into the header tank 18 is connected to a space below the first header tank 18 of the heat exchanger 12 on the air downstream side.

The second header tanks 19 and 20 also have a substantially cylindrical shape extending in the vertical direction, and the other ends of the tubes 21 communicate with each other. Further, the internal space of the second header tanks 19 and 20 is not partitioned by the partition plate and penetrates in the vertical direction. Further, the adjacent first header tanks 17 and 18 are arranged so that the vertical end portions B thereof are in close contact with each other in the air ventilation direction A, and the vertical end portions B are spot-like. It is attached. Similarly, the second header tank 1
9 and 20 are also arranged such that their vertical end portions B are in direct contact with each other, and these vertical end portions B are spot brazed.

Therefore, adjacent first header tanks 17 and 18 and second header tanks 19 and 20 are integrally joined to each other by spot brazing at a total of four places.
The two heat exchangers 11 and 12 are made into an integral structure. Next, the connection block body 25, which is an essential part of the present invention, will be described in detail. This connection block body 25 is formed by adjoining the first header tanks 17 and 18 of the two heat exchangers 11 and 12.
The connection block bodies 25 connect the refrigerant passages between them, and are formed of aluminum or an aluminum alloy material like other heat exchanger parts.

The connection block body 25 has a first tubular portion 25a connected to the first header tank 17 on one side and a second tubular portion 2 connected to the first header tank 18 on the other side.
5b and a main body portion 25c that communicates the refrigerant passage between the first and second tubular portions 25a and 25b. The main body 25c is formed in a substantially rectangular parallelepiped shape in this example, and an opening 25d is provided on one side surface of the main body 25c. A lid member 25e is brazed over the entire circumference of the opening 25d to form an opening. The portion 25d is closed.

The first and second tubular portions 25a, 25
The b and the main body portion 25c are integrally formed into a sectional shape shown in FIG. 2 by cutting an aluminum material. On the other hand, communication holes 26 and 27 are formed on the outer peripheral surface of the first header tanks 17 and 18 near the upper ends of the first header tanks 17 and 18 on the side opposite to the joint with the tube 21. The distance L between the tubular portions 25a and 25b is set to match the distance between the communication hole portions 26 and 27 when the header tanks 17 and 18 in the ventilation front-back direction are arranged in close contact with each other.

By setting the distance L in this way,
By arranging both header tanks 17 and 18 in the ventilation front-back direction substantially in close contact with each other, it is possible to minimize the overall dimension of the multiple heat exchanger 10 in the ventilation front-back direction. In addition, the outer diameters of the first and second tubular portions 25a and 25b are set to sizes that can be fitted into the communication holes 26 and 27, and the first and second tubular portions 25a and 25b are It is brazed to the header tanks 17 and 18 while being fitted in the communication holes 26 and 27.

Since the first embodiment has the above-mentioned structure, the refrigerant passage between the adjacent first header tanks 17 and 18 of the two heat exchangers 11 and 12 is formed as an integrally molded product. Since it can be connected by one connection block body 25, and this one connection block body 25 has a structure which is directly brazed to the communication hole portions 26, 27 of both header tanks 17, 18, it has a conventional structure. It does not require a screwing structure using a simple bolt or a sealing structure using a sealing material,
The refrigerant passage connection portion can be extremely compact and simple.

Further, since the connection block body 25 and the communication hole portions 26, 27 of both header tanks 17, 18 can be brazed at the same time as the brazing of the heat exchanger, the screwing work is eliminated and the heat is eliminated. The productivity of assembling the exchanger can be improved. Next, the flow of the refrigerant in the duplex heat exchanger 10 of this example will be briefly described. The refrigerant flows from the inlet pipe 14 into the lower space of the first header tank 18 of the heat exchanger 12 on the air downstream side, The refrigerant flows into the second header tank 20 through the tube 21 in the lower half of the heat exchanger 12, and then makes a U-turn there, so that the refrigerant passes through the tube 21 in the upper half of the heat exchanger 12. The upper space of the first header tank 18 is reached.

After that, the refrigerant is the second tubular portion 25b of the connection block body 25, the main body portion 25c, and the first tubular portion 25a.
Via the flow into the upper space of the first header tank 17 of the heat exchanger 11 on the upstream side of the air, and reaches the second header tank 19 through the tube 21 in the upper half of the heat exchanger 11. Next, in this second header tank 19, the refrigerant makes a U-turn, passes through the tube 21 in the lower half of the heat exchanger 11 to reach the lower space of the first header tank 17, and then exits from the outlet pipe 13 to the outside. leak.

Heat exchange is performed between the conditioned air that is ventilated in the direction of arrow A and the refrigerant while the refrigerant flows in the above-mentioned path, and the blown air is cooled, dehumidified, or heated. FIGS. 3 to 5 show a more concrete example of the shape of the first embodiment in consideration of mountability to an automobile, assembling property, etc. The basic form is the first embodiment. The same parts as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted. (Second Embodiment) FIGS. 6 and 7 show a second embodiment, in which the shape of the connection block body 25 is changed so that it can be manufactured by die forming such as die casting or cold forging instead of cutting. The connection block body 25 can be manufactured as a molded product.

That is, in the second embodiment, in the main body portion 15c of the connection block body 25, the opening portion 25d is provided at a portion facing the first and second tubular portions 25a and 25b, whereby the first and second portions are formed. Tubular parts 25a, 25b
In the axial direction (left and right direction in FIG. 6) of the main body portion 15c, a molding die for molding the inner wall shape of the main body portion 15c can be removed so that the connection block body 25 is not subjected to cutting work but die casting, cold forging or the like. It can be manufactured by molding. A lid member 25e is brazed around the opening 25d to close the opening 25d.

Since the connecting block body 25 can be molded without cutting in this way, the material cost of the connecting block body 25 can be reduced significantly compared to the first embodiment, and the molding of the connecting block body 25 can be performed. You can greatly improve the property. The duplex heat exchanger according to the present invention is not limited to the indoor heat exchanger of the heat pump type air conditioner described above, and can be widely applied to heat exchangers for various purposes. Further, the joint B and the like of the header tanks may be joined by welding instead of brazing.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a first embodiment of the present invention.

FIG. 2 is a detailed sectional view of a C portion of FIG.

FIG. 3 is a plan view of a heat exchanger that is a more specific form of the heat exchanger according to the first embodiment of the present invention.

4 is a front view of the heat exchanger of FIG.

5 is a left side view of the heat exchanger of FIG.

FIG. 6 is a sectional view of a connection block body showing a second embodiment of the present invention.

FIG. 7 is a perspective view of the connection block body shown in FIG.

[Explanation of symbols]

10 ... Double heat exchanger, 11, 12 ... Heat exchanger, 17, 1
8 ... 1st header tank, 19, 20 ... 2nd header tank, 21 ... Tube, 22 ... Fin, 25 ... Connection block body, 25a ... 1st tubular part, 25b ... 2nd tubular part,
25c ... Main body part, 25d ... Opening part, 25e ... Lid member, 2
6, 27 ... Communication holes.

Claims (5)

[Claims] 1. A plurality of tubes arranged in parallel, fins arranged between the plurality of tubes, and a pair of header tanks that connect one end and the other end of the plurality of tubes to each other. A heat exchanger consisting of a plurality of heat exchangers arranged side by side in the air-ventilation direction, having a connection block body for connecting a medium passage between adjacent header tanks of the plurality of heat exchangers. The connection block body includes a first tubular portion connected to one header tank, a second tubular portion connected to the other header tank, and a medium between the first and second tubular portions. The first tubular portion communicates with the communication hole portion of the one header tank, and the second tubular portion communicates with the other header tank. In the hole Double heat exchanger, characterized in that respectively are directly bonded. 2. The double heat exchanger according to claim 1, wherein an opening is provided in the main body of the connection block body, and the opening is closed by a lid member. 3. The main body portion of the connection block body, the opening is provided at a portion facing the first and second tubular portions, the main body portion of the connection block body and the first And the second
The double heat exchanger according to claim 2, wherein the tubular portion and the tubular portion are integrally formed by molding. 4. The first tubular portion and the second tubular portion are directly joined to the communication hole portion by brazing, respectively. The dual heat exchanger described in. 5. A portion of adjacent header tanks of the plurality of heat exchangers is arranged so as to be in direct contact with each other in the air ventilation direction, and the header tanks are joined to each other at this direct contact portion. The dual heat exchanger according to any one of claims 1 to 4, which is characterized.