JPH074872A - Heat exchanger and manufacturing method thereof - Google Patents

Abstract

(57) [Summary] [Object] The present invention relates to a heat exchanger for exchanging heat between two fluids, and an object thereof is to realize miniaturization for easy mounting. [Structure] A flat pipe bent so as to reciprocate on a plane with a substantially constant length, and a primary fluid flow path 1 formed by connecting a plurality of the flat pipes by a first connecting pipe 3. Since the flat parts are brought into contact with each other so as to have a heat exchange relationship with the secondary fluid flow path 2 connected by the second connection pipe 4 and fixed by the fixing fitting 5, the heat exchanger with a small dead space is provided. Can be realized.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchanger for exchanging heat between two fluids and a method for manufacturing the same.

[0002]

2. Description of the Related Art As shown in FIG. 10, a conventional heat exchanger of this type has a flat tube in the shape of a double-winding cylinder in which primary fluid passages 1 and secondary fluid passages 2 are alternately adjacent to each other. Is formed, and the flat portion thereof has a heat exchange relationship (for example, JP-A-60-117088). The outer shape is shown in FIG.

[0003]

However, in the above-mentioned conventional structure, since the hollow portion is formed inside the cylinder, the dead space is large and the size cannot be reduced. Therefore, there is a problem that the size of the entire device increases when it is mounted on the device.

Further, when the flat tube is rolled into a cylindrical shape, a force acts in a direction in which the flat tube becomes larger than the target diameter due to the elasticity of the tube, so that the flat portions of the flat tubes are brought into close contact with each other while maintaining a predetermined shape. There was a problem that it was difficult to manufacture.

The present invention solves the above problems, and a first object of the present invention is to realize miniaturization for easy mounting.

A second object is to provide a heat exchanger that is easy to manufacture.

[0007]

In order to achieve the first object of the present invention, the present invention comprises a plurality of flat tubes which are bent so as to reciprocate on a plane with a substantially constant length, and a plurality of the flat tubes. The flat parts are in contact with each other so that the primary fluid flow path and the secondary fluid flow path that are connected are in a heat exchange relationship.

In order to achieve the second object, a pipe bending step of reciprocating the pipe in a substantially constant length, a pressing step of pressing the bent pipe to form a flat tube, and the flat tube A stacking step of stacking the flat parts in contact with each other, a connecting step of connecting flat tubes so as to form two flow paths of a primary fluid flow path and a secondary fluid flow path, and a stacked flat connection It is manufactured by a manufacturing process including a flat tube fixing step of holding the tubes so as to maintain a heat exchange relationship with each other.

Further, in order to achieve the first object with another structure, a flat tube bent in a spiral shape, a primary fluid flow path formed by connecting a plurality of the flat tubes, and a secondary fluid The flat portions are in contact with each other so as to have a heat exchange relationship with the flow path.

With this structure, in order to achieve the second object, a pipe bending step of bending the pipe in a spiral shape, a pressing step of pressing the bent pipe into a flat tube, and a flat portion of the flat tube. A stacking step of contacting and stacking, a connecting step of connecting flat tubes to form two flow paths of a primary fluid flow path and a secondary fluid flow path, and a stacked and connected flat tube It is manufactured by a manufacturing process including a flat tube fixing step of holding the tubes so as to maintain a heat exchange relationship with each other.

[0011]

According to the present invention, with the above-described structure, the flat portions of the primary fluid flow passage and the secondary fluid flow passage are brought into contact with each other to exchange heat. Therefore, the dead space can be reduced.

Further, after the pipes are bent into a predetermined shape, they are pressed and flattened, and the primary fluid passages and the secondary fluid passages are connected to each other so that they maintain a heat exchange relationship with each other. To be retained.

[0013]

Embodiments of the present invention will be described below with reference to FIGS.

In FIG. 1, a primary fluid channel 1 in which a flat tube is reciprocated on a plane, and a primary fluid channel 1 having the same shape and a secondary fluid channel 2 in which flat portions of the flat tube are adjacent to each other A first connecting pipe 3 for connecting a plurality of primary fluid flow passages 1, a second connecting pipe 4 for connecting a plurality of secondary fluid flow passages, a primary fluid flow passage 1 and a secondary fluid It is composed of a fixing member 5 for maintaining a heat exchange relationship with the working channel 2.

FIG. 2 is a plan view showing one module of the primary fluid channel 1 and the secondary fluid channel 2.

FIG. 3 is a partial sectional view of the configuration of FIG.
It shows that the primary fluid channel 1 and the secondary fluid channel 2 are in contact with each other at the flat portion.

In the above structure, the primary fluid channel 1 and the secondary fluid channel 2 exchange heat through the tube walls which are alternately in contact with each other. Here, since the length per volume of the flow path can be increased by reducing the diameter of the bent portion 6 at the end portion in FIG. 2, it is possible to reduce the dead space.

FIG. 4 shows another shape of the module of the primary fluid flow channel 1 and the secondary fluid flow channel 2, whereby the external dimensions can be further reduced.

In mounting on a device, it is possible to easily cope with a difference in capability by increasing or decreasing the number of modules. Further, the dimensions of the module itself can be easily changed by changing the length of the linear portion, so that the module can be easily accommodated in the device, and as a result, the external size of the device can be reduced.

5 to 8 show a method of manufacturing this heat exchanger. First, the pipe is bent into the shape shown in FIG. Then, as shown in FIG. 6, the inside of the alternate long and short dash line is pressed by using a pressing machine to form a flat tube while maintaining this shape to form one module. Further, the modules are stacked as shown in FIG. 7, and the first connecting pipe 3 and the second connecting pipe 4 are formed so that the primary fluid passage 1 and the secondary fluid passage 2 are formed adjacent to each other. Weld each. Finally, the primary fluid passage 1 and the secondary fluid passage 2 are fixed by the fixing fittings 5 so as to maintain the heat exchange relationship, and the configuration of FIG. 1 is completed. The above processes can be handled by general production machines such as pipe bending, pressing, and welding, and no special ones are required, so process control and quality control are easy and low cost can be realized as a result.

FIG. 8 shows another embodiment, which is a flow path 1 for a primary fluid in which a flat tube is spirally wound, and a flow path 1 for a primary fluid having the same shape.
And a second fluid channel 2 in which flat portions of the flat tube are adjacent to each other, a first connecting tube 3 for coupling a plurality of primary fluid channels 1, and a plurality of secondary fluid channels are also coupled. The second connecting pipe 4 and the fixing fitting 5 for maintaining the heat exchange relationship between the primary fluid channel 1 and the secondary fluid channel 2.

According to the structure of this embodiment, the flat tube can be formed in a single plate shape, and the space between the reciprocating tubes generated in the first embodiment does not occur, so that the volume can be further reduced. effective. However, the ability to increase or decrease the capacity depending on the number of modules is the same as in the first embodiment, but since the finished shape is cylindrical, it is inferior to the first embodiment in terms of storage in equipment. There is.

The manufacturing method is basically the same as that of the first embodiment except for the bent shape of the pipe. After the pipes are wound in a spiral shape as shown in FIG. 9, they are pressed, stacked, connected and fixed.

[0024]

As described in the above embodiments, the heat exchanger of the present invention has the following effects.

(1) A flat tube bent so as to reciprocate on a plane with a substantially constant length, and a primary fluid flow path and a secondary fluid flow path each formed by connecting a plurality of the flat tubes. Since the flat portions are in contact with each other so as to have a heat exchange relationship, the dead space is small and the size can be reduced.

(2) It is possible to easily cope with devices having different capabilities by increasing or decreasing the number of modules.

(3) Since the vertical and horizontal dimensions of the module itself can be changed as necessary, the external dimensions can be freely changed to easily cope with the difference in the shape of the device.
Easy to implement.

(4) Since it can be manufactured by a simple process using a general production machine such as bending, pressing, and welding of pipes, manufacturing and quality control are easy, and cost can be suppressed.

[Brief description of drawings]

FIG. 1 is a perspective view of a heat exchanger according to an embodiment of the present invention.

FIG. 2 is a diagram showing a module of a flow path of the heat exchanger.

FIG. 3 is a sectional view of the heat exchanger.

FIG. 4 is a view showing a module having another shape of the flow path of the heat exchanger.

FIG. 5 is a diagram showing a bent shape of a pipe in the manufacturing process of the heat exchanger.

FIG. 6 is a view showing a shape after a piping press in a manufacturing process of the heat exchanger.

FIG. 7 is a view showing stacking and connection of modules in the manufacturing process of the heat exchanger.

FIG. 8 is a perspective view of a heat exchanger according to another embodiment of the present invention.

FIG. 9 is a view showing a bent shape of a pipe in the manufacturing process of the heat exchanger.

FIG. 10 is a sectional view of a conventional heat exchanger.

FIG. 11 is a perspective view of the outer shape of the heat exchanger.

[Explanation of symbols]

 1 Flow path for primary fluid 2 Flow path for secondary fluid 3 First connecting pipe 4 Second connecting pipe 5 Fixing fitting

Claims (4)

[Claims] 1. A flat tube bent so as to reciprocate on a plane with a substantially constant length, and a primary fluid flow path and a secondary fluid flow path formed by connecting a plurality of the flat tubes. A heat exchanger configured by bringing flat portions into contact with each other so as to have a heat exchange relationship. 2. A pipe bending step of reciprocating the pipe in a substantially constant length, a pressing step of pressing the bent pipe into a flat tube, and a stacking step in which the flat portions of the flat tube are brought into contact with each other and stacked. A step, a connecting step of connecting the flat tubes so as to form two channels of a primary fluid channel and a secondary fluid channel,
The method for manufacturing a heat exchanger according to claim 1, further comprising a step of fixing the flat tubes that are stacked and connected so as to maintain a heat exchange relationship with each other. 3. A flat tube which is bent in a spiral shape, and a flat portion which is in a heat exchange relationship with a primary fluid flow path and a secondary fluid flow path which are each formed by connecting a plurality of the flat tubes. A heat exchanger constructed by contacting each other. 4. A pipe bending step of bending the pipe in a spiral shape, and a pressing step of pressing the bent pipe into a flat tube.
A stacking step of stacking the flat parts of the flat tubes in contact with each other, and a connecting step of connecting the flat tubes to form two flow paths, a primary fluid flow path and a secondary fluid flow path, The method for manufacturing a heat exchanger according to claim 3, further comprising a flat tube fixing step of holding the connected flat tubes so as to maintain a heat exchange relationship with each other.