JPS6111591A - Heat pipe heat exchanger - Google Patents

Abstract

PURPOSE:To permit to use one piece of meandering pipe as if it were a plurality of heat pipes and enlarge the heat exchanging capacity thereof freely by a method wherein a plurality of condensing sections and evaporating sections are formed in one piece of heat pipe. CONSTITUTION:A pipe 10 is divided into upper and lower parts by a partitioning plate 17 provided at substantially the central section of the straight pipe sections thereof. The partitioning plate 17 is divided into two sections and the split surfaces thereof are provided with guide sections 21 for pinching the straight pipe sections of the meandering heat pipe 10 while the straight pipe sections 10a of the pipe 10 are held by the guide sections 21. The pipe 10 is filled with the proper amount of working refrigerant 20 and the lower part from the partitioning plate 17 becomes the evaporating section B while the upper part becomes the condensing section. The condensing section, consisting of a plurality of bent sections of the pipe, is provided at one side of one piece of heat pipe heat exchanger and the evaporating section, consisting of a plurality of bent sections of the pipe, is provided at the other side of the heat pipe heat exchanger whereby the heat transfer areas of condensing section and evaporating section may be increased and heat exchanging performance, equal to a plurality of heat pipe heat exchangers, may be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a heat pipe heat exchanger in which a working refrigerant is sealed inside a pipe, and which absorbs heat and heats a surrounding fluid by evaporating and condensing the working refrigerant.

[Conventional technology]

As shown in FIG. 6, a conventional heat pipe is a straight pipe 30 in which a working refrigerant 20 is sealed, and is composed of a condensing section A and an evaporating section B. Radiation fins 31 are provided to improve the exchange rate. Here, the working refrigerant 20 takes heat from the surrounding fluid, for example, air, and evaporates in the evaporation section B, and releases heat to the surroundings in the condensation section A, liquefies it, travels inside the pipe 30, and returns to the evaporation section B. It's starting to go back. As described above, since conventional heat pipes have a straight tube shape, one heat pipe has only one condensing section A and one evaporating section C, so this heat pipe can be used to cool equipment, for example. required multiple heat pipes to increase the cooling effect.

For this reason, it took a lot of effort to combine a plurality of heat exchangers into one heat exchanger. Furthermore, when filling each heat pipe with the working fluid 20, if non-condensable gas such as air remains inside the pipe 30, the performance of the heat pipe will deteriorate. After that, an appropriate amount of working refrigerant 20 is filled in, and the filling port 12 is filled with the working refrigerant 20.
It is necessary to crush the heat pipes and seal them with brazing or the like. Conventionally, the above-mentioned sealing work was required for each heat pipe that constitutes a heat exchanger.

Furthermore, as shown in Japanese Unexamined Patent Application Publication No. 55-92884, it is known to form a heat pipe in a loop shape, but in this case as well, only one evaporation section and one condensation section are provided. However, there is a problem in that there is a limit to the size of each heat pipe heat exchanger.

[Problem that the invention seeks to solve]

In order to solve the above problem, the present invention forms a plurality of condensing sections and evaporating sections in one heat pipe.

[Means for solving problems]

Therefore, the heat pipe heat exchanger of the present invention includes at least a pipe that is bent into a serpentine shape and has a working refrigerant sealed therein, a plurality of bent portions formed at one end of the pipe, and other parts of the pipe. It is comprised of a plurality of bent portions formed on the end side, and a partition member that shields the outer periphery of one end of the pipe from the outer periphery of the other end of the pipe.

〔Example〕

The present invention will be explained in detail below based on embodiments shown in the drawings.

FIG. 1 shows a preferred embodiment of the present invention, in which a gravity type heat pipe heat exchanger 3 is made of aluminum having high thermal conductivity.
A pipe 10 made of copper or the like having a circular cross section is bent into a meandering shape, and a working refrigerant 20 such as water or fluorocarbon is sealed inside the pipe 10. This pipe 10 is
A partition plate 17 provided approximately in the center of the straight pipe portion of the pipe 10
is divided into upper and lower parts. This partition plate 17 is divided into two parts as shown in FIG.
In addition, in order to sandwich the meandering heat pipe 10, three punch holes are provided in the guide portion 21 of the plate 17a,
A through hole 23 is provided in the guide portion 21 of the plate 17b at a position opposing these, and the straight pipe portion 10a of the pipe 10 is inserted into the guide portion 21.
Hold it firmly.

Note that a plurality of bent portions are formed in the pipe IO during serpentine forming, and above the partition portion 17, there are bent portions 14a,
Bent portions 13a, 13b, and 13c are formed below the partition portion 17, and the curved portions are all connected through a plurality of connecting portions 1°a. Here, if an appropriate amount of working refrigerant 20 is sealed in the pipe 10, that is, to the extent that the liquid level is located below the partition plate I7, the area below the partition plate 17 becomes the evaporation section B, and the partition plate 17
The upper part becomes the condensing part. A fin 11 having good thermal conductivity, such as aluminum, is wrapped around the pipe 10 serving as the condensing section A and the evaporating section B in order to promote heat exchange.

Here, the manufacturing process of the heat pipe heat exchanger 3 shown in FIG. 1 will be explained.

First, before forming the pipe 10 in a meandering manner, the fins 11 are spirally wound around the portions that will become the condensing section A and the evaporating section B. In this case, an adhesive may be applied to the fins 11 or the pipe 10, or they may be fixed by brazing or the like.

Next, the pipe 10 is formed into a serpentine shape, and then the inside of the pipe 10 is evacuated from the filling port 12, and an appropriate amount of working refrigerant is sealed.
The sealing opening 12 is sealed. Finally, the partition plate 17 is attached.

As described above, according to this example, a plurality of evaporation sections B (13a, 13b, 13C113d) and a plurality of condensation sections A (14a, 14b, 14C) are formed in one pipe 10, so that The meandering tube acts as if it were multiple heat pipes, and as a result, the heat exchange capacity can be increased freely.

In addition, in order to obtain the same performance as in this example using a conventional heat pipe, at least 8 heat pipes are required, as can be clearly seen from Fig. 1, but according to this example, 7 heat pipes are required. It can be easily manufactured by bending.

In addition, in the conventional case, it is necessary to seal the working refrigerant in each of the eight heat pipes, but in this embodiment,
Enclosing the working refrigerant only needs to be done once, which greatly reduces the time required for manufacturing.

Next, a cooling device incorporating the heat pipe heat exchanger 3 configured as described above will be explained.

FIG. 4 shows an example in which the continuous heat pipe 3 according to the present invention is applied to a cooler inside a control panel of a machine tool or the like. Control panels for machine tools, etc., generate heat due to internal electrical components, etc.
It becomes hotter than the outside air, and must be cooled to ensure the reliability of electrical parts. In this case, the purpose of cooling can be achieved by supplying external air directly into the control panel, but the external air often contains dust, oil mist, cutting chips, etc. This results in damage to reliability. Therefore, by applying the double-pipe heat exchanger 3 of the present invention, the high temperature air inside and the outside air can be exchanged without contact.
Heat can be exchanged efficiently and internal electrical components can be cooled.

This will be explained in detail below using FIG. 4.

In the figure, reference numeral 1 denotes a nearly sealed control panel box in which electrical components that generate heat when energized are housed. Reference numeral 2 denotes a cooling device that cools the inside of the box, and a heat pipe heat exchanger 3 of the present invention, a cooling air side blower 4, and a cooled air side blower 5 are housed inside the case 2a. In this case, the heat pipe heat exchanger is 90° to 45° to the horizontal direction.
Install so that it forms an angle of °. The inside of the case 2a is divided by a partition plate 17 into two heat radiating sections and a heat receiving section 2B, and the inside of the two heat radiating sections is a condensing section A of the heat pipe heat exchanger 3.
The air introduced into the heat dissipation section 2A from the cooling air inlet 2b is heated when passing through the condensing section A, and is separated by a partition plate 8 provided at the two ends.
C to the outside of the case 2a.

On the other hand, the inside of the heat receiving part 2B is partitioned by a partition plate 9 provided at the lower end of the evaporation part B of the heat pipe heat exchanger 3, and a box body is introduced into the heat receiving part 2B from the inlet 2d of the cooled air. 1 internal air is cooled while passing through the evaporation section B, and is again blown into the box 1 through the air outlet 2e.

In FIG. 4, arrows 6a, 6b, and 6C represent circulation paths for cooling air, and arrows 7a, 7b, and 7C represent circulation paths for air to be cooled.

The present invention is not limited to the above-described embodiments, but can be modified in various ways as described below.

(1) In the above-mentioned embodiment, a plurality of curves are formed in one pipe 10 by serpentine forming into a - body, but in addition to this, for example, as shown in FIG. 13 tubes 1
9 and a U-shaped short pipe 18 may be joined by brazing, welding, or the like to form one serpentine pipe 10 1-2, and then the working refrigerant may be enclosed from the enclosure 1'l I2.

Further, the ratio of the lengths of the long tube 19 and the short tube 18 can be changed as necessary.

(2) Although the heat transfer pipe 10 of the heat pipe heat exchanger has a circular cross section, a rectangular flat tube may also be used. It is also possible to use a pipe with grooves formed on the inner surface of the heat exchanger pipe to improve heat conduction to the working refrigerant 20.

(3) Although the above heat pipe heat exchanger 3 has been described as a gravity-type one, if a wick is provided on the inner surface of the pipe 10, it can be operated regardless of the vertical direction of the installation position. This improves the heat transfer efficiency of the working refrigerant.

(4) In the above-mentioned embodiment, the case where equipment is cooled using the heat pipe heat exchanger 3 of the present invention was explained.
On the contrary, it goes without saying that it can also be used for heating, space heating, etc. For example, the top pipe heat exchanger 3 of the present invention
By thermally connecting the evaporating section B to the exhaust pipe of the automobile and arranging the condensing section A in the vehicle interior, the interior of the vehicle can be heated effectively.

〔Effect of the invention〕

As mentioned above, one end of a single heat pipe heat exchanger is provided with a condensing section consisting of a plurality of pipe bends, and the other end is provided with an evaporation section consisting of a plurality of pipe bends. , the heat transfer area in the condensing section and the evaporating section is increased, and heat exchange performance equivalent to that of multiple heat pipes can be obtained. Moreover, when installing multiple heat pipes, it is necessary to fill the working refrigerant inside the pipes multiple times.
With the heat pipe of the present invention, only one step is required, making it possible to significantly shorten manufacturing time and, as a result, to reduce manufacturing costs.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing the structure of the heat pipe of the present invention, FIG. 2 is an assembled view of a partition plate attached to the heat pipe of the present invention, FIG. 3 is a perspective view showing the attachment of fins, and FIG. 4 5 is a schematic configuration diagram of a heat exchange device using the heat pipe of the present invention, FIG. 5 is a cross-sectional view showing another embodiment of the heat pipe of the present invention, and FIG. 6 is a cross-sectional view of a conventional heat pipe. . 3...Heat pipe, 10...Pipe, 10a...
・Connection part, 11...Fin, 12...Enclosure port, 17
...Partition plate, 13a, 13b, 13c, 13d...-
Bend part (evaporation part), 14a, 14b, 14cm bend part (condensation part), 20... Working fluid.

Claims (1)

[Claims] A pipe that is bent into a serpentine shape and has a working refrigerant sealed therein, a plurality of bends formed at one end of the pipe, and a plurality of bends formed at the other end of the pipe opposite to the bends. a plurality of bent portions, a plurality of connecting portions connecting the bent portions to the bent portion on the one end side, and a plurality of connecting portions provided in the middle of the connecting portions, the outer periphery of one end side of the opposing bent portion being connected to the outer periphery of the other end side. A heat pipe heat exchanger comprising: a partition member that shields the heat pipe from heat.