JP2001050672A - Heat exchanger and manufacture of the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate manufacturing of work and reduction in the manufacturing cost. SOLUTION: One series of heat exchanging medium passage is constituted of meandering pipes 10 laminated in three layers, and a plurality of heat radiating fins 20 attached to the passages. In this heat exchanger, each heat radiating fin 20 is provided with an outer layer pipe-mounting part and an inner layer pipe-mounting part at both side rims, while three layered neighboring meandering pipes 10 are connected mutually through respective pipe-mounting parts of the fins 20, by a method where the meandering pipe 10 in the central layer and the meandering pipes 10 at both of outside layers are connected via the pipe-mounting parts of respective fins.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchanger and a method of manufacturing the same, and more particularly, to a heat exchanger for radiating heat of a refrigeration cycle provided in a refrigerator or other refrigeration equipment and a method of manufacturing the same. It is.

[0002]

2. Description of the Related Art FIG. 13 shows such a heat exchanger. The heat exchanger A is a heat-dissipation device that is used, for example, in a refrigeration cycle provided in refrigeration equipment such as a refrigerator to dissipate heat of a heat-exchange medium vaporized by heat absorption and to liquefy it again. And a large number of radiation fins C.

[0003] The pipe B is used to form a passage for the heat exchange medium, and is made of a material having a high heat transfer coefficient and a high formability, such as aluminum. The pipe B is formed so as to form at least three layers in order to secure the flow path of the heat exchange medium as long as possible in a limited space, and each pipe is meandering.

The radiating fins C are connected to pipes B forming respective layers.
The pipe B is attached in such a manner that it comes into contact with the peripheral surface of the pipe B and keeps a narrow space in the longitudinal direction of the pipe B.
To increase the heat dissipation area of
It has a rectangular plate shape made of a material having a high heat transfer coefficient.

[0005] The heat exchanger A having the above configuration is
Conventionally, it is configured by the following method.

First, as shown in FIGS. 14 (a) and 14 (b), two long and short pipe elements B1 and B2 having different lengths are prepared, and each is bent in a plane so as to meander.

On the other hand, as the radiation fin C, FIG.
As shown in FIG. 15A and FIG. 15B, one having a pipe mounting portion D on both side edges (hereinafter referred to as a double fin plate C1) and a pipe mounting portion only on one side edge D (hereinafter referred to as single fin plate C)
2) are prepared. The pipe mounting portion D has a circular mounting hole D1 fitted into the pipe elements B1 and B2, and a narrow notch D2 for opening the mounting hole D1 to the side edge of each of the fin plates C1 and C2. It is structured in shape. As is apparent from the drawing, the single fin plate C2 is configured such that its width is substantially half the width of the double fin plate C1.

Next, as shown in FIG. 16, the long pipe element B1 is subjected to three-dimensional bending to form a two-layer structure.
Further, as shown in FIG. 17, the layers are interconnected by a double fin plate C1. Short pipe element B
2 is individually provided with a single fin plate C2. A fin plate C is attached to these pipe elements B1 and B2.
When mounting 1, C2, pipe elements B1, B2
Oval cross section of which is narrower than the notch D2 described above,
Alternatively, it is corrected to have an elliptical shape, and the portion corrected to the oval shape is inserted into the pipe mounting portion D of each of the fin plates C1 and C2 through the notch D2. Thereafter, the pipe elements B1 and B2 are pressed inside the mounting hole D1 so that the cross-section of the pipe element B1 and B2 becomes the original circular shape.

Finally, these two long and short pipe elements B1
, B2 are connected to each other by argon welding, and the side edge of the double fin plate C1 and the side edge of the single fin plate C2 are connected to each other by spot welding or the like, so that the meandering pipe B is laminated in three layers. Thus, a series of heat exchange medium passages is formed, and a heat exchanger A having a number of radiation fins C mounted in the passages is completed. In addition,
For the completed heat exchanger A, both ends of the pipe B are closed with rubber stoppers, and then hot sodium hydroxide (94%).
９７97 ° C.) to perform a boehmite treatment, and then perform a leak test using an appropriate detector.

[0010]

As described above, in the heat exchanger A in which the two long and short pipe elements B1 and B2 are separately manufactured and then joined, the manufacturing process is omitted. In many cases, the manufacturing operation becomes extremely complicated. That is, the pipe elements B1 and B2 are individually bent and formed, and the mounting process of the fin plates C1 and C2 is required individually for each of the pipe elements B1 and B2.

In addition, a step of joining the fin plates C1 and C2, a step of joining the two pipe elements B1 and B2, and an individual leak test for the joint E are required, resulting in an increase in manufacturing cost. It becomes a factor to do.

Further, since the number of parts to be handled increases, such as two long and short pipe elements B1, B2 having different lengths, a double fin plate C1, a single fin plate C2, etc., this leads to an increase in the production cost in terms of parts management.

SUMMARY OF THE INVENTION In view of the above circumstances, an object of the present invention is to provide a heat exchanger and a method of manufacturing the same, which facilitate manufacturing operations and reduce manufacturing costs.

[0014]

SUMMARY OF THE INVENTION The present invention provides a series of passages for a heat exchange medium by laminating a meandering pipe in at least three layers consisting of a central layer and outer layers on both sides thereof. In a heat exchanger in which the radiating fins are mounted with a gap in the longitudinal direction of each layer of the pipe, the radiating fins have pipe mounting portions on both side edges, respectively.
And, for the three layers of pipes meandering adjacent to each other, the pipes of the meandering central layer and the pipes of the outer layers meandering on both sides thereof are interconnected via the pipe mounting parts. It is characterized by. In this case, the radiation fins connecting between the meandering central layer pipe and the meandering outer layer pipe on one side thereof, and between the central layer pipe and the meandering outer layer pipe meandering on the other side. It is preferable that the radiating fins to be connected are alternately arranged.

Further, according to the present invention, a meandering pipe is laminated on at least three layers consisting of a central layer and outer layers on both sides thereof to form a series of passages for a heat exchange medium, and a plurality of radiating fins are formed in the passages. In the method for manufacturing a heat exchanger to be mounted while keeping a gap in the longitudinal direction of each layer, a pipe is appropriately bent to form at least three layers of meandering pipes, and pipes are formed on both side edges. A step of interposing radiating fins each having a mounting portion between adjacent layers of the meandering pipe, and pressing each of the layers of the meandering pipe to the pipe mounting portion of the radiating fin at once by pressing from both outer layers. And the step of causing

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings showing embodiments. 1 to 3 show one embodiment of the heat exchanger according to the present invention. The heat exchanger 1 exemplified here, like the conventional heat exchanger A shown in FIG. 13, radiates a heat exchange medium vaporized by heat absorption in a refrigerating cycle provided in a refrigerator or the like. A pipe for forming a passage of a heat exchange medium, and a number of radiating fins 20 for increasing a radiating area of the pipe 10. ing.

The pipe 10 is formed of a material having a high heat transfer coefficient and high formability, such as aluminum, and has three layers, and each layer is meandering.

The radiating fins 20 are formed in a rectangular shape by a plate (plate thickness is, for example, 0.2 mm) of a material having a large heat transfer coefficient, such as aluminum, and the meandering center layer 10C and both outer layers of the pipe 10 are formed. 10L and 10R are connected alternately. Each radiating fin 20 is shown in FIG.
As shown in FIG. 3, three pipe mounting portions 21 and 22 are provided on both side edges at intervals in the vertical direction. Each of the pipe mounting portions 21 and 22 has mounting holes 21 a and 22 a having a slightly smaller inner diameter than the outer diameter of the pipe 10, and narrow notches 21 b and 22 b for opening the mounting holes 21 a and 22 a to the side edges of the radiation fin 20. 22b to form an Ω shape. For example, if the outer diameter of the pipe 10 is 8.0
mm, the inner diameter of the mounting holes 21a and 22a is 7.9 mm.
And the width of the notches 21b and 22b is set to 6.3 mm.

The pipe mounting portions 21 and 22 are vertically adjacent to each other at the same side edge, and secure a distance x between them, and a distance y between the pipe mounting portions 21 and 22.
Is provided to ensure The length of the notch 21b of the pipe mounting portion 21 provided on one side edge is larger than the length of the notch 22b of the pipe mounting portion 22 provided on the other side edge. That is, the radius of the pipe 10 is z
In this case, the pipe mounting portion provided on one side edge portion (hereinafter, simply referred to as the outer layer pipe mounting portion 21) is located at a position substantially at a distance 3z from one side edge of the radiation fin 20 and the other side edge portion is provided. Is located at a position substantially at a distance z from the other side edge of the radiating fin 20.

Hereinafter, a method of manufacturing the heat exchanger 1 will be sequentially described.

First, as shown in FIG. 4, copper FB (flash butt) pipes 30, 31 are respectively joined to both ends 10 ', 10' of the pipe 10 by high frequency welding. In this case, below the melting point of copper (1083 ° C),
It is preferable to heat the joint between the two to a temperature higher than the eutectic temperature of copper-copper oxide (about 1065 ° C.). FB pipe 3
A rubber plug (not shown) is attached to each end of the FB pipe to the pipe 10 to which the pipes 0 and 31 are joined, and a leak test is performed by an appropriate detector.

Next, the pipe 10 is meandered by being folded back and bent. In this case, in this embodiment,
Bending processing is performed so that it has seven folded portions and each folded portion has the same illustrated dimensions as described for the radiation fins 20. That is, from the top in the figure,
Each of the fourth and fifth folded portions has a length x, each of the third and sixth folded portions has a length y, and a seventh folded portion has a length of 2x. Mold into Note that the distance to each folded portion is the same length L except for both ends.

Next, the meandering pipe 10 is subjected to three-dimensional bending, as shown in FIGS. 5 and 6 (a).
The pipe 10 comprises a central layer 10C and two outer layers 10C.
L and 10R are combined to form three layers.
In this case, the vertical interval between the three folded portions of the central layer 10C and one outer layer 10R is x, and the other outer layer 10R is x.
The vertical interval between the two folded portions of L is 2x, and the horizontal interval between the folded portions of the central layer 10C and the outer layers 10L and 10R is y. Further, by appropriately applying a press machine, the pipe 10 of each layer 10C, 10L, 10R
Pressure from above and below (see FIG. 6 (b)),
As shown in FIG. 6C and FIG. 6D, the cross section is corrected so as to have an oval shape or an elliptical shape narrower than the notches 21b and 22b of the radiating fin 20 described above. For example, when the notches 21b and 22b of the radiation fin 20 have a width of 6.3 mm as described above, 6.0 m is used.
m.

On the other hand, the radiation fins 20 are prepared in a state where the radiating fins 20 are aligned in a pair of mounting jigs 40 and 41.
As shown in FIG. 7, these assembling jigs 40 and 41 are formed in a block shape having a width of (y−2z).
It has a number of slits 40a, 41a. Each of the slits 40a and 41a has a gap slightly larger than the thickness of the radiation fin 20 (for example, the radiation fin 20 has a thickness of 0.2 m).
m, the gap is about 0.6 mm) and equidistant from each other (for example, when the thickness of the radiation fin is 0.2 mm,
The interval is about 5.0 mm), and the radiating fins 20 can be detachably housed and held inside each of them.

Next, as shown in FIG. 8, the layer interval y of the pipe 10 is slightly widened, and the width between them is (y-2).
The jigs 40 and 41 of z) are inserted and arranged. in this case,
As shown in FIG. 9, the central layer 10 </ b> C of the pipe 10 in which the three-stage inner-layer pipe mounting portion 22 which keeps the space of x in the vertical direction of the radiating fins 20 housed and held in the respective mounting jigs 40 and 41 meanders. And one of the mounting jigs 40 (or 4
The heat dissipating fins 20 accommodated and held in 1) are alternately arranged such that the heat dissipating fins 20 accommodated and held in the other mounting jig 41 (or 40) are positioned between the heat dissipating fins 20 accommodated and held in 1).

From this state, as shown in FIG. 10, when the pipe 10 is pressed by the upper and lower pressing dies 50, 51 set in the press machine, the pipes shown in FIGS. 11 (a) and 11 (b) are obtained.
As shown in the figure, the pipe 10 is deformed at the pipe mounting portions 21 and 22 of the heat radiation fin 20, respectively, and the cross section returns to the original circular shape, and the pipe 10 is attached to the mounting holes of the pipe mounting portions 21 and 22. 21a and 22a are fitted and held.

In this case, the meandering pipe 10 of the outer layer 10L is fitted to one of the radiating fins 20 at the outer layer pipe mounting portions 21 at the upper and lower stages, and the meandering pipe 10 of the outer layer 10R is fitted to the other radiating fins 20. Pipes 10 are fitted to the outer pipe mounting portions 21 of the upper, middle and lower stages, and the meandering pipes 10 in the central layer 10C are fitted to inner pipe mounting portions 22 of the heat radiation fins 20 above and below. Will be. That is, the meandering pipe 10 of the outer layers 10L and 10R
And the meandering pipe 10 in the central layer 10C are connected to each other by pipe mounting portions 22, 22 which overlap before and after the two radiation fins 20, 20 mounted between each other. Therefore, it is not necessary to mutually connect the radiation fins 20 housed and held by one of the assembly jigs 40 and the heat dissipation fins 20 housed and held by the other assembly jig 41.

Finally, the heat exchanger 1 is completed by immersing the pipe 10 and the radiation fins 20 in hot sodium hydroxide (94 to 97 ° C.) and subjecting them to boehmite treatment.

In the heat exchanger 1 configured as described above, the radiation fins 20, 20 can be mounted at once between the respective layers with respect to one pipe 10 constituting the three layers at the center and the outer sides. Therefore, as before, it is not necessary to perform the bending operation and the mounting operation of the fin plate on each of the two pipe elements, and the manufacturing process can be greatly reduced.

Moreover, since the passage of the heat exchange medium can be constituted by one pipe 10, the leak inspection performed on the joints of the pipe elements is not required as before. Further, since the leak inspection of the entire pipe 10 can be performed before the heat radiation fins 20 are attached, the leak inspection can be easily performed.

On the other hand, the parts to be handled are the pipe 10
In addition, since there is only one type of radiating fin 20, component management is also facilitated.

As a result, according to the heat exchanger 1,
The simplification of the manufacturing process and the simplification of parts management can greatly reduce the manufacturing cost.

Further, the meandering pipe 10 in the central layer has an increased contact area with the radiation fins 20 as compared with the conventional pipe, which is advantageous in terms of the heat radiation effect.

In the above-described embodiment, the length of the folded portion of the outer layer 10L is set to 2x so that both ends 10 'and 10' of the pipe are oriented in the same direction. Are fitted only above and below the three outer pipe mounting portions 21 above and below the one radiating fin 20, and the middle pipe mounting portion was not used, but the orientation of both ends 10 ', 10' of the pipe was changed. When the opposite is possible, the outer layer 10L may meander three times similarly to the outer layer 10R, and may be fitted to all the outer pipe mounting portions 21 of the radiation fins 20.

Further, in the above-described embodiment, the heat exchanger in which the meandering pipes are laminated in three layers to form a series of passages for the heat exchange medium is exemplified. Can of course also be applied. For example, when a meandering pipe is laminated in four layers, FIG.
In the case of laminating five layers, the structure may be as shown in FIG. Hereinafter, even in the case of laminating six or more layers, it can be easily realized by similarly developing in the horizontal direction.

Further, the dimensions shown in the embodiment are merely examples, and the heat exchanger may be configured to have other dimensions.

[0037]

As described above, according to the present invention,
Because it is possible to attach the radiation fins at once between each layer to the pipe constituting at least three layers,
As before, it is not necessary to perform the bending operation and the mounting operation of the heat radiation fins for each of the plurality of pipe elements, so that the manufacturing process can be greatly reduced. Moreover, since the passage of the heat exchange medium can be constituted by one pipe, there is no need to perform a leak test for the joint of the pipe elements as before. Further, since the leak inspection of the entire pipe can be performed before the heat radiation fins are attached, the leak inspection can be easily performed. Further, since one kind of pipe and one radiating fin are used as parts to be handled, parts management becomes easy. As a result, the manufacturing cost can be significantly reduced due to the simplification of the manufacturing process and the simplification of component management. Further, as for the pipe which becomes the central layer in the adjacent three-layer pipe, the contact area with the radiation fin is increased as compared with the conventional pipe, which is advantageous in terms of the heat radiation effect.

[Brief description of the drawings]

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

FIG. 2 (a) is a side view of the heat exchanger shown in FIG. 1,
(B) is an II view in (a).

FIG. 3 is an enlarged perspective view showing a radiation fin applied to the heat exchanger of FIG. 1;

FIG. 4 is a view showing a state where the pipe applied to the heat exchanger of FIG. 1 is bent in a plane and meandered.

FIG. 5 is a perspective view showing a state in which a pipe applied to the heat exchanger of FIG. 1 is three-dimensionally bent to form three layers.

6A is a view taken in the direction of arrow VI in FIG. 5, FIG. 6B is a cross-sectional view of the pipe in the state of FIG. 5A, FIG. 6C is a view showing a state in which the pipe has been corrected to an oval shape, and FIG. () Is a cross-sectional view of the pipe in the state of (c).

FIG. 7 is a perspective view of a mounting jig applied when mounting a radiation fin to a pipe.

FIG. 8 is a plan view showing a state in which radiation fins are arranged between layers of a pipe by applying a built-in jig.

9 is a sectional view taken along line IX-IX in FIG.

FIG. 10 is a cross-sectional view conceptually showing a state in which a pipe is mounted on a pipe mounting portion of a radiation fin.

11A and 11B show a mounting process of a pipe and a radiation fin, and FIG. 11A is a cross-sectional view showing a state immediately after a pipe is inserted into a pipe mounting portion of the radiation fin, and FIG. It is sectional drawing which shows the state which returned to the shape.

FIG. 12 shows a modification of the heat exchanger according to the present invention, in which (a) is a plan view of a heat exchanger in which a meandering pipe is laminated in four layers to form a series of passages for a heat exchange medium, (B) is a plan view of a heat exchanger in which a meandering pipe is laminated in five layers to form a series of heat exchange medium passages.

FIG. 13 is a perspective view conceptually showing a conventional heat exchanger.

FIG. 14 is a diagram showing a state where two pipe elements applied to the heat exchanger of FIG. 13 are each bent in a plane and meandered.

FIG. 15 is a perspective view showing a radiation fin applied to the heat exchanger of FIG.

16 is a perspective view showing a state in which one of pipe elements applied to the heat exchanger of FIG. 13 is formed into two layers by performing three-dimensional bending.

FIG. 17 is a perspective view showing a state where two pipe elements applied to the heat exchanger of FIG. 13 are connected to each other.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Heat exchanger 10 Pipe 10C Central layer of pipe 10L, 10R Outer layer of pipe 20 Radiation fin 21 Outer pipe mounting part 21a, 22a Mounting hole 21b, 22b Notch 22 Inner pipe mounting part 30, 31 FB pipe 40, 41 Built-in Jigs 40a, 41a Slits 50, 51 Vertical pressing type

Claims (3)

[Claims] 1. A meandering pipe is laminated at least in three layers consisting of a central layer and outer layers on both sides thereof to form a series of passages for a heat exchange medium, and a plurality of radiating fins are formed in the passages for each layer of the pipe. In a heat exchanger mounted with a gap in the longitudinal direction, the radiating fins have pipe mounting portions on both side edges, respectively, and these fins meander with respect to three adjacent pipes meandering. A heat exchanger characterized in that the pipes of the central layer and the pipes of the outer layers meandering on both sides thereof are connected to each other via the pipe mounting portions. 2. A radiating fin connecting between a meandering central layer pipe and a meandering outer layer pipe on one side thereof;
2. The heat exchanger according to claim 1, wherein radiation fins for connecting between the pipe of the central layer and the pipe of the external measurement layer meandering on the other side are arranged alternately. 3. 3. A meandering pipe is laminated in at least three layers consisting of a central layer and outer layers on both sides thereof to form a series of passages for the heat exchange medium, and a plurality of radiating fins are formed in the passages for each layer of the pipe. In the method of manufacturing a heat exchanger to be mounted with a gap in the longitudinal direction, by appropriately bending the pipe, forming at least three layers of meandering pipes, and forming pipe mounting portions on both side edges. A step of interposing the radiating fins respectively between the layers of the meandering pipe adjacent to each other; and a step of mounting each layer of the meandering pipe to the pipe mounting portion of the radiating fin at a time by pressing from both outer layers. A method for manufacturing a heat exchanger, comprising: