JPH05106977A - Heat pipe type heat exchanger - Google Patents

Abstract

(57) [Summary] [Object] An object of the present invention is to provide a heat pipe type heat exchanger capable of closely adhering a heat pipe and a heat transfer member. According to the present invention, the heat pipe 22 having the working fluid 12 sealed therein is inserted into the insertion hole 16a of the heat transfer member 16, and the heat pipe 22 is heated and expanded to thereby heat the heat pipe 22 and the heat transfer member. In the heat pipe type heat exchanger 20 in which the heat pipe 22 and the heat pipe 22 are in close contact with each other, the body portion 24 of the heat pipe 22 which is required to have high adhesion to the heat transfer member 16 is replaced with other portions (upper end portion, lower end portion) 26a, 26b
The expansion rate is set relatively high compared to.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat pipe type heat exchanger, and more particularly to a heat pipe type heat exchanger manufactured by a heat expansion method.

[0002]

2. Description of the Related Art FIG. 7 shows the structure of a conventional heat pipe heat exchanger. This heat pipe type heat exchanger 10 is composed of a heat pipe 14 of uniform thickness in which the hydraulic fluid 12 is enclosed, and a heat transfer member 16 arranged around the heat pipe 14. The heat transfer member 16 is provided with an insertion hole 16a having an inner diameter slightly larger than the outer diameter of the heat pipe 14.

The heat pipe type heat exchanger 10 is manufactured by a tube expanding method. That is, the heat pipe 14 is inserted into the insertion hole 16 a of the heat transfer member 16, the whole or a part of the heat transfer member 16 is heated, and the heat pipe 14 is expanded by the vapor pressure of the hydraulic fluid 12 in the heat pipe 14. Thus, the heat pipe 14 is plastically deformed and brought into close contact with the inner wall of the insertion hole 16 a of the heat transfer member 16.

[0004]

However, the conventional heat pipe type heat exchanger 10 manufactured by the tube expanding method as described above has the following problems.

That is, when the heat exchanger 10 is heated during manufacturing, the upper and lower portions of the heat pipe 14 expand first and come into contact with the insertion hole 16a, the strength of the contact portion increases, and the heat pipe 14 The body portion may not adhere to the inner wall of the insertion hole 16a. As a result, there arises a problem that the heat transfer efficiency of the heat exchanger is reduced.

Therefore, the hydraulic fluid 12 in the heat pipe 14
It is conceivable to increase the amount of the heat pipe or to raise the heating temperature.
There is a risk of bursting.

[0007]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a heat pipe type heat exchanger capable of adhering a heat transfer member to a heat pipe well.

[0008]

A heat pipe type heat exchanger according to the present invention is a heat pipe type heat exchanger in which a heat pipe in which a working fluid is sealed is inserted into a heat transfer member and the heat pipe is heated and expanded. In a heat pipe type heat exchanger in which a heat pipe and a heat transfer member are in close contact with each other, a portion of the heat pipe that is required to have high adhesion with the heat transfer member has a relatively higher expansion coefficient than other portions. It is set high.

[0009]

In the present invention constructed as described above, when the heat pipe is heated to manufacture the heat pipe type heat exchanger by the heat expansion method, the portion requiring high adhesion with the heat transfer member is quickly It expands and surely adheres to the heat transfer member. In other words, the other part of the heat pipe does not expand first and come into contact with the heat transfer member, which does not hinder the close contact between the part requiring high adhesion and the heat transfer member. Also,
Since there is no need to increase the amount of hydraulic fluid in the heat pipe or raise the heating temperature, there is no risk of the heat pipe bursting due to an excessive increase in internal pressure.

[0010]

An embodiment of the present invention will now be described in detail with reference to the accompanying drawings. FIG. 1 shows the structure of a heat pipe heat exchanger 20 according to the first embodiment. The heat pipe type heat exchanger 20 is composed of a metal heat pipe 22 in which the hydraulic fluid 12 is sealed, and a heat transfer member 16 arranged around the metal heat pipe 22. Heat transfer member 1
6 has an insertion hole 16a having an inner diameter slightly larger than the outer diameter of the heat pipe 22. Heat pipe 2
2 is a thin body portion 24 and a thick upper end portion 26a.
And a lower end portion 26b.

When the heat pipe 22 is inserted into the insertion hole 16a of the heat transfer member 16 and the whole or a part of the heat transfer member 16 is heated in the manufacture of the heat pipe type heat exchanger 20 having the above-mentioned structure, the heat is transferred. Hydraulic fluid 12 in pipe 14
Due to the vapor pressure, the thin-walled body portion 24 expands and comes into close contact with the inner wall of the insertion hole 16a. On the other hand, the thick upper end 2
6a and the lower end 26b hardly expand.

Next, another embodiment of the present invention will be described. It should be noted that in the other embodiments described below, description of the configurations and operations common to the first embodiment will be omitted, and only different configurations will be described. The heat pipe type heat exchanger 30 according to the second embodiment of the present invention shown in FIG.
Uses a heat pipe 34 having a groove 32 formed on the inner wall surface of the body portion. As a result, the heat pipe 34
The strength of the body of the
Expands easily when heated.

The heat pipe type heat exchanger 40 according to the third embodiment of the present invention shown in FIG. 3 has a groove 44 on the outer surface of the body portion of the heat pipe 42, contrary to the second embodiment. Is forming. As a result, the same effect as that of the second embodiment can be obtained.

The heat pipe type heat exchanger 50 according to the fourth embodiment of the present invention shown in FIG. 4A has a uniform wall thickness like the conventional heat pipe type heat exchanger shown in FIG. The heat pipe 14 is used, and the reinforcing sleeves 52a and 52b are arranged at the upper end and the lower end. As a result, the strength of the end portion of the heat pipe 14 is increased, and the strength of the body portion is relatively reduced as compared with the end portion. In addition, in order to obtain the same effect, as shown in FIG.
A reinforcing cup 54 may be provided instead of 2b.

In the heat pipe type heat exchanger 60 according to the fifth embodiment of the present invention shown in FIG. 5, a heat pipe 62 is formed by a blunting material, and an upper end portion 64a and a lower end portion 64b are formed.
By subjecting the steel to a quenching treatment, the strength of the upper end portion 64a and the lower end portion 64b is increased.

The heat pipe type heat exchanger 70 according to the sixth embodiment of the present invention shown in FIG. 6 comprises a heat pipe 72 made of a different metal. That is, a material having high strength is used for the upper end portion 74a and the lower end portion 74b,
A material having low strength is used for the body portion 76, and the heat pipe 72 is formed by joining these materials. The upper end portion 74a and the lower end portion 74b may be made of the same material or different materials.

[0017]

As described above, in the heat pipe type heat exchanger according to the present invention, the portion of the heat pipe that is required to have high adhesion to the heat transfer member is relatively relatively compared to other portions. Since the expansion coefficient is set high, the heat pipe and the heat transfer member can be brought into good contact with each other.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a configuration of a heat pipe heat exchanger according to a first embodiment of the present invention, (A) showing a state before heating and (B) showing a state after heating. ..

FIG. 2 is a sectional view showing a configuration of a heat pipe heat exchanger according to a second embodiment of the present invention.

FIG. 3 is a partial cross-sectional view showing the configuration of the heat pipe heat exchanger according to the third embodiment of the present invention.

FIG. 4 is a cross-sectional view showing a configuration of a heat pipe heat exchanger according to a fourth embodiment of the present invention, in which (A) and (B) show different modes.

FIG. 5 is a sectional view showing the configuration of a heat pipe heat exchanger according to a fifth embodiment of the present invention.

FIG. 6 is a sectional view showing a configuration of a heat pipe type heat exchanger according to a sixth embodiment of the present invention.

FIG. 7 is a cross-sectional view showing a configuration of a heat pipe heat exchanger according to a conventional technique.

[Explanation of symbols]

12 Working fluid 14, 24, 34, 44, 62, 72 Heat pipe 16 Heat transfer member 16a Insertion hole 20, 30, 40, 50, 60, 70 Heat pipe type heat exchanger 24, 76 Body part 26a, 64a, 74a Upper end 26b, 64b, 74b Lower end 32 Inner surface groove 42 Outer surface groove 52a, 52b Reinforcing sleeve 54 Reinforcing cup

Claims (7)

[Claims] 1. A heat pipe in which a heat pipe in which a working fluid is sealed is inserted into a heat transfer member and the heat pipe is heated and expanded to bring the heat pipe and the heat transfer member into close contact with each other. Type heat exchanger, wherein the heat pipe is set to have a relatively high expansion coefficient in a portion where high adhesion with the heat transfer member is required as compared with other portions. Type heat exchanger. 2. The heat pipe according to claim 1, wherein the heat pipe is formed such that a portion where high adhesion with the heat transfer member is required is thinner than other portions. Pipe heat exchanger. 3. The heat pipe type heat exchange according to claim 1, wherein the heat pipe has a predetermined groove formed on an inner surface of a portion where high adhesion with the heat transfer member is required. vessel. 4. The heat pipe type heat exchange according to claim 1, wherein the heat pipe has a predetermined groove formed on an outer surface of a portion where high adhesion to the heat transfer member is required. vessel. 5. The heat pipe is provided with a predetermined reinforcing member for increasing strength in a portion other than a portion where high adhesion with the heat transfer member is required. Heat pipe type heat exchanger. 6. The heat pipe is provided with a blunting material in a portion other than a portion requiring high adhesion to the heat transfer member, and is subjected to quenching treatment to increase the strength of the portion. The heat pipe type heat exchanger according to claim 1. 7. The heat pipe according to claim 1, wherein the heat pipe is formed of a material having a weaker strength in a portion where high adhesion to the heat transfer member is required as compared with other portions. Pipe heat exchanger.