JPH07310988A - Multi-tubular heat exchanger - Google Patents

Abstract

PURPOSE:To lessen the number of items of members and to enhance the pressure-resisting performance of tanks by a method wherein one meandering passage through which a heat exchange medium passes is formed of one meandering pipe and first and second tanks are made cylindrical respectively. CONSTITUTION:A plurality of single meandering pipes 4 are located closely with a prescribed space between them, and one end of each meandering pipe 4 is joined to a first tank 1 and the other end thereof to a second tank 2 respectively. A heating medium flows into the first tank 1 from an external fluid circuit, and the heating medium flowing into the first tank 1 flows into the second tank 2 through the meandering pipes 4 and returns to the external fluid circuit from the second tank 2. In other words, one meandering passage through which a heat exchange medium passes is formed of one meandering pipe 4. The first tank 1 and the second tank 2 are shaped like cylinders. According to this constitution, the number of items of members can be lessened, while the pressure-resisting performance of the tanks 1 and 2 is improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-tube heat exchanger used for an air conditioner of an automobile.

[0002]

2. Description of the Related Art As shown in FIG.
A multi-tube heat exchanger including a plurality of linear pipes 200 that communicate the pair of tanks 100 with each other is known. In the multi-tube heat exchanger, a plurality of chambers are defined in the tank 100 in order to obtain a sufficient flow path length in the heat exchanger, and the heat exchange medium is a linear pipe 200 and a tank. While sequentially passing through the chamber defined in the inside 100, the pair of tanks 100 reciprocates once or a plurality of times to meander and flow. Further, in the multi-tube heat exchanger, a rectangular parallelepiped shape has been conventionally used as the shape of the tank 100.

[0003]

In the conventional shell-and-tube heat exchanger, since a single meandering flow path through which the heat exchange medium passes is constituted by a plurality of straight pipes, the number of parts is large. There was a problem. Further, since the tank has a rectangular parallelepiped shape, there is a problem that the pressure resistance is low.
The present invention has been made in view of the above problems, and an object of the present invention is to provide a multi-tube heat exchanger that has a smaller number of members than the conventional multi-tube heat exchanger and that has a high tank pressure resistance. And

[0004]

In order to solve the above-mentioned problems, in the present invention, a plurality of meandering pipes, which are stacked and arranged at a predetermined interval from each other, and one end of the plurality of meandering pipes are provided. Provided is a multi-tubular heat exchanger comprising a first tank connected to the first tank and a second tank connected to the other ends of the plurality of meandering pipes. Further, in the present invention, a plurality of U-shaped pipes that are stacked and arranged at a predetermined distance from each other, a first tank to which one end of the plurality of U-shaped pipes are connected, and a plurality of U-shaped pipes. An assembly including a second tank having the other end of the mold pipe connected thereto,
At least two adjacent tanks of adjacent assemblies are connected to each other by a plurality of U-shaped pipes that are stacked and arranged at predetermined intervals. A multi-tube heat exchanger is provided. In a preferred aspect of the present invention, the first tank and the second tank are
It has a cylindrical shape.

[0005]

In the present invention, since one meandering flow path through which the heat exchange medium passes is constituted by one or a plurality of meandering pipes, one meandering flow path is constituted by a plurality of straight pipes. The number of pipes can be reduced as compared with the conventional multi-tube heat exchanger. Further, in the present invention, since one meandering flow path through which the heat exchange medium passes is composed of a plurality of U-shaped pipes, a conventional structure in which one meandering flow path is composed of a plurality of straight pipes The number of pipes can be reduced as compared with the multi-tube heat exchanger. By forming the first tank and the second tank in a cylindrical shape, the pressure resistance performance of the tank is improved as compared with the shell-and-tube heat exchanger having the conventional structure.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A multi-tube heat exchanger according to a first embodiment of the present invention will be described with reference to FIGS. A cylindrical first tank 1 with one end closed and a cylindrical second tank 2 with one end closed are arranged in parallel with each other and extend horizontally. The open ends of the first tank 1 and the second tank 2 are connected to an external fluid circuit (not shown). The first tank 1 and the second tank 2 are connected to each other by a plate member 3 on both sides of which a bent portion 3a that contacts the first tank 1 and the second tank 2 is formed.

A plurality of meandering pipes 4 are arranged below the first tank 1 and the second tank 2. Meandering pipe 4
Meander in a vertical plane orthogonal to the extending direction of the first tank 1 and the second tank 2. The plurality of meandering pipes 4 is the first
Arranged at predetermined intervals in the extending direction of the tank 1 and the second tank 2 and in a staggered manner in the direction orthogonal to the extending direction of the first tank 1 and the second tank 2 so as to be stacked. Has been done. One end of each meandering pipe 4 penetrates through the hole 3b formed in the plate member 3 and the hole 1a formed in the side wall of the first tank 1 and is inserted into the first tank 1. The other end of each meandering pipe 4 has a hole 3c formed in the plate member 3 and a second
The hole 2a formed in the side wall of the tank 2 is penetrated to
It is inserted into the tank 2. An upper bent portion of each meandering pipe 4 is fitted into an oval hole 3d formed in the plate member 3. The bent portion below each meandering pipe 4 has a plate member 3
Oval hole 5 formed in the plate member 5 arranged below
It is fitted to a. Flange portions 5b extending downward are formed on both sides of the plate member 5. The joint portions of the first tank 1, the second tank 2, the plate member 3, the meandering pipe 4, and the plate member 5 are brazed.

In the shell-and-tube heat exchanger according to this embodiment having the above structure, the heat exchange medium flows into the first tank 1 from an external fluid circuit (not shown). The heat exchange medium that has flowed into the first tank 1 flows through the meandering pipe 4 into the second tank 2, and then returns from the second tank 2 to an external fluid circuit (not shown). While passing through the meandering pipe 4, the heat exchange medium exchanges heat with a fluid, such as air, flowing outside the meandering pipe 4.

In this multi-tube heat exchanger, since one meandering flow path through which the heat exchange medium passes is composed of one meandering pipe 4, one meandering flow path is formed into a plurality of straight lines. The number of pipes can be reduced as compared with the conventional multi-tube heat exchanger configured by pipes. The first tank 1 and the second tank 2 have a cylindrical shape, and have a higher pressure resistance than a rectangular parallelepiped tank included in a conventional tubular heat exchanger. First tank 1, second tank 2 and a plurality of meandering pipes 4
Since the upper bent portion of the pipe is connected by the plate member 3 and the lower bent portions of the plurality of meandering pipes 4 are connected by the plate member 5, the multitubular heat exchanger has high overall rigidity. .

A multi-tube heat exchanger according to a second embodiment of the present invention will be described with reference to FIG. Two cylindrical first tanks 11, 11 extend in parallel with each other. First tank 1
Two meandering pipes 14, 14 are arranged in parallel in a vertical plane orthogonal to the extending direction of 1, 11. 2 above
The pipe array α consisting of the serpentine pipes 14, 14
In the extending direction of the tanks 11 and 11, at predetermined intervals from each other,
In addition, the first tanks 11 and 11 are arranged in a staggered manner in a direction orthogonal to the extending direction of the first tanks 11 and stacked. One end of one meandering pipe 14 in the pipe row α is a first one
It is connected to the tank 11, and one end of the other meandering pipe 14 is connected to the other first tank 11. The other ends of the two meandering pipes 14 are arranged below the first tanks 11, 11 and are connected to a second tank 16 extending in parallel with the first tanks 11, 11. An intermediate portion of the meandering pipe 14 is fitted in an oval hole formed in the two plate members 17. The first tanks 11, 11 and the second tank 16 are configured by assembling curved plate members, and the first tanks 11, 11 are connected by the plate members. The joint portion of each member is brazed.

In this multi-tube heat exchanger, the heat exchange medium flowing from the external fluid circuit into one of the first tanks 11 is
The one of the two meandering pipes 14 forming the pipe row α flows into the second tank 16, and the pipe row α
Through the other of the two meandering pipes 14 that make up
It flows into the other first tank 11 and the other first tank 1
Return from 1 to the external fluid circuit. In this multitubular heat exchanger, there are two meandering flow paths through which the heat exchange medium passes.
Since it is constituted by the serpentine pipes 14, the number of pipes can be reduced as compared with the conventional multi-tube heat exchanger in which one serpentine flow path is constituted by a plurality of straight pipes. The first tanks 11 and 11 and the second tank 16 have a cylindrical shape, and have a higher pressure resistance than a rectangular parallelepiped tank included in the conventional tubular heat exchanger. The first tank 11,
Since 11 is connected by a plate member, and the intermediate portions of the plurality of meandering pipes 14 are also connected by a plate member, the multitubular heat exchanger has a high overall rigidity.

A multitubular heat exchanger according to a third embodiment of the present invention will be described with reference to FIG. Cylindrical first tank 21
a and the second tank 22a extend parallel to each other. Below the first tank 21a and the second tank 22a, a plurality of U-shaped pipes 24a, which are stacked at intervals in the extending direction of the first tank 21a and the second tank 22a, are arranged. One end of the U-shaped pipe 24a has the first tank 21.
a, and the other end is connected to the second tank 22a. First
The first assembly A is composed of the tank 21a, the second tank 22a, and the plurality of U-shaped pipes 24a. First tank 21b, second tank 22b, a plurality of U-shaped pipes 24
A second assembly B composed of b is disposed adjacent to the first assembly A and in a plane-symmetrical relationship with the first assembly A. The second tank 22a of the first assembly A
And the second tank 22b of the adjacent second assembly B are located below the second tanks 22a and 22b.
They are connected by a plurality of U-shaped pipes 24c, which are laminated at intervals in the extending direction of 22b. The downward curved portions of the U-shaped pipes 24 a, 24 b, 24 c are fitted into the oval holes formed in the plate member 25. The first tanks 21a and 21b and the second tanks 22a and 22b have two
By assembling a plurality of curved plate members, they are connected to each other. The joint portion of each member is brazed.

In this multi-tube heat exchanger, the heat exchange medium flowing from the external fluid circuit into the first tank 21a of the first assembly A passes through the U-shaped pipe 24a and then the first assembly A.
Flow into the second tank 22a of the first assembly A, the second tank 22a of the first assembly A through the U-shaped pipe 24c, the second tank 22b of the second assembly B, and the U-shaped pipe 2
4b, flows into the first tank 21b of the second assembly B, and returns from the first tank 21b of the second assembly B to the external fluid circuit. In the multi-tube heat exchanger, the U-shaped pipe 24 is used as a single meandering passage through which the heat exchange medium passes.
Since it is composed of a, 24c and 24b, the number of pipes can be reduced as compared with the conventional multi-tube heat exchanger in which one meandering flow path is composed of a plurality of straight pipes. The first tank 21a and the second tank 22a of the first assembly A and the first tank 21b and the second tank 22b of the second assembly B have a cylindrical shape. It has higher pressure resistance than a rectangular parallelepiped tank. The first tanks 21a and 21b and the second tanks 22a and 22b are connected to each other, and the downward curved portions of the U-shaped pipes 24a, 24b and 24c are also connected to each other by the plate member 25. The vessel has a high overall rigidity.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments. For example, in the third embodiment, a third assembly having the same structure as the second assembly B is arranged adjacent to the second assembly B, and the second assembly B and the third assembly B are arranged next to each other.
The tanks adjacent to each other and the assembly may be connected by a plurality of U-shaped pipes.

[0015]

As described above, according to the present invention, there is provided a multi-tube heat exchanger having a smaller number of members and a higher tank pressure resistance than the conventional multi-tube heat exchanger.

[Brief description of drawings]

FIG. 1 is a perspective view of a shell-and-tube heat exchanger according to a first embodiment of the present invention.

FIG. 2 is a sectional view of a shell-and-tube heat exchanger according to the first embodiment of the present invention.

FIG. 3 is a sectional view of a shell-and-tube heat exchanger according to a second embodiment of the present invention.

FIG. 4 is a sectional view of a shell-and-tube heat exchanger according to a third embodiment of the present invention.

FIG. 5 is a perspective view of a shell-and-tube heat exchanger having a conventional structure.

[Explanation of symbols]

 1 1st tank 2 2nd tank 3 plate member 4 meandering pipe 5 plate member 11 1st tank 14 meandering pipe 16 2nd tank 17 plate member 21a, 21b 1st tank 22a, 22b 2nd tank 24a, 24b, 24c U shape Molded pipe 25 Plate member A First assembly B Second assembly 100 Tank 200 Straight pipe

Claims (3)

[Claims] 1. A plurality of meandering pipes stacked and arranged at a predetermined distance from each other, a first tank to which one ends of the plurality of meandering pipes are connected, and other ends of the plurality of meandering pipes. A multi-tube heat exchanger having a second tank connected thereto. 2. A plurality of U-shaped pipes, which are stacked and arranged at a predetermined distance from each other, a first tank to which one ends of the plurality of U-shaped pipes are connected, and a plurality of the U-shaped pipes. At least two assemblies each including a second tank to which the other end of the pipe is connected are arranged adjacent to each other, and adjacent tanks of the adjacent assemblies are stacked at a predetermined distance from each other. Multi-tube heat exchanger characterized by being connected by multiple U-shaped pipes. 3. The multi-tube heat exchanger according to claim 1, wherein the first tank and the second tank have a cylindrical shape.