JP2587886B2 - Capillary pipe - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to at least one package in which at least one heating element is installed,
The present invention relates to a loop-shaped pipe connected at both ends to the package and communicating with the inside of the package, a working fluid sealed in a predetermined amount in the package, and a capillary pipe having at least one condenser provided in the pipe.

[0002]

2. Description of the Related Art FIG. 5 (1) is a configuration diagram of a conventional example of a capillary pipe, and FIG. 5 (2) is a perspective view showing the inside of a package 2 of FIG. 5 (1).

[0003] A heating element 1 is installed inside a package 2 integrated with a thin tube 3. Here, the thin tube 3 and the inside of the package 2 communicate with each other. A condensable working fluid having a low dielectric constant, for example, a Freon-based working fluid, is sealed inside the package 2, and a check valve 4 for controlling the flow of the fluid is provided in the thin tube 3. Heat generated from the heating element 1 is present inside the package 2 and rapidly evaporates the working fluid in contact with the heating element 1 to become a boiling liquid, and cools the heating element 1 by latent heat of evaporation. The fluid containing the latent heat of vaporization becomes a gas-liquid two-phase flow in which bubbles and the liquid are intermingled, and flows to the pipe portion in contact with the cooling plate 5. In this portion, the bubbles are condensed, and when the phase changes from gas to liquid, the latent heat of evaporation is radiated to the outside as condensing heat, and returns to the package 2 as condensed liquid. The driving force for the fluid to flow back to the package 2 depends on the pressure wave propagation effect caused by the boiling of the working fluid in the package 2 and the pressure difference caused by the temperature difference between the package temperature and the temperature of the thin tube portion in contact with the cooling plate 5. And flows back in the direction regulated by the check valve 4. By these actions, the heat from the heating element 1 can be transported to the cooling plate 5, and the heating element 1 is cooled.

[0004]

In the conventional capillary pipe described above, the evaporating pressure when the working fluid evaporates inside the package is dispersed at two points of the fluid inlet and outlet of the pipe, and the fluid circulates at high speed. Drive power is not obtained,
Therefore, there is a disadvantage that the cooling efficiency of the heating element does not improve,
Further, since a check valve must be provided inside the thin tube, the reliability of the fluid circulation is reduced due to the aging of the check valve, and it is difficult to lay the check valve in the pipe due to the miniaturization of the capillary pipe. There were drawbacks.

It is an object of the present invention to provide a capillary pipe which generates a driving force for circulating a fluid at a high speed, has a high cooling efficiency, and does not require a check valve.

[0006]

In order to achieve the above object, a capillary pipe of the present invention divides the inside of a package into two or more spaces and allows a liquid phase to pass therethrough but a gas phase blocking partition. A wick connecting the spaces divided by the partition to each other is provided inside the package.

[0007]

The interior space of the package is divided into two or more parts, and a partition for blocking the gas phase while allowing the liquid phase to pass therethrough is provided. A wick is provided inside the package to connect these spaces to each other. It can be divided into a liquid pool part where the condensed liquid returns from the pipe, and a boiling part where a heating element is installed, and the gas-liquid two-phase flow containing the latent heat of evaporation flows out to the pipe when the working fluid boils. Since the liquid pool part does not receive the pressure generated in the boiling part, the pressure inside the package is applied only to the cross section of the pipe on the fluid outlet side where the gas-liquid two-phase flow flows out to the pipe to increase the driving force of the fluid. Is possible, the circulation speed is improved, and the cooling efficiency of the heating element is improved. Therefore, a check valve becomes unnecessary, and the reliability of fluid circulation is improved. Further, by connecting the liquid pool portion and the boiling portion with the wick, the condensed working fluid can be easily returned to the heating element in the package by utilizing the capillary pressure of the wick.

[0008]

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1A is a structural view of a capillary pipe according to one embodiment of the present invention, FIG. 1B is a perspective view showing the inside of a package 2, and FIG. 2A is a groove type as a wick 7-1. The figure which shows the inside of the package 2 using the wick 7-2,
2 (2) and 2 (3) are AA ′ lines in FIG. 2 (1), respectively.
FIG. 3A is a cross-sectional view taken along the line BB ′, and FIG.
Groove wick 7-2 and mesh wick 7-3
3 (2), which shows the inside of the package 2 using
(3) is a sectional view taken along the line AA 'and BB' in FIG. 2 (1), respectively, and FIG. 4 (1) is a partition 6-1 and a wick 7-1.
Is a view showing the inside of the package 2 made of a porous material, and FIGS. 4 (2) and (3) are respectively AA ′ in FIG. 4 (1).
It is sectional drawing along the line, BB 'line.

The thin tube 3 is integrated with the package 2 to form a sealed space inside the thin tube 3, and a part of the thin tube 3 is in contact with the cooling plate 5. In the package 2, the internal space of the package 2 is divided into a boiling portion 8 and a liquid pool portion 9, and a partition for allowing a liquid phase to pass therethrough but blocking a gas phase.
1 and a wick 7-1 capable of containing liquid is provided so as to connect the space between the boiling portion 8 and the liquid pool portion 9. The boiling portion 8 is filled with a predetermined amount of condensable hydraulic fluid, for example, a Freon-based hydraulic fluid.

Next, the operation of cooling the capillary pipe of this embodiment will be described. The heat generated by the heating element 1 is the boiling portion 8
Boil the working fluid and generate a pressure wave when boiling. Since the wick 7-1 is filled with the working fluid, the pressure wave is not propagated to the liquid pool portion 9 but is propagated only to the cross section of the thin tube 3 connected to the boiling portion 8 and contains gas containing latent heat. The driving force drives the liquid two-phase flow. By this driving force, the gas-liquid two-phase flow containing the latent heat is propelled in the thin tube 3 and reaches the portion of the thin tube 3 in contact with the cooling plate 5, and releases the heat to the outside when the steam condenses. The condensed working fluid reaches the pool portion 9 by the pressure wave propagating from the boiling portion 8, and returns to the boiling portion 8 due to a capillary pressure difference of the wick 7-1 existing between the boiling portion 8 and the pool portion 9. The heating element 1 is cooled by repeating this cycle.

As shown in FIG. 2, by using a groove-shaped wick 7-2 as the wick 7-1, the boiling portion 8 and the liquid pool portion 9 can be continuously connected. FIG.
As shown in FIG. 7, by using the groove wick 7-2 and the mesh wick 7-3 together, the working fluid condensed from the liquid pool portion 9 to the boiling portion 8 can be removed from the groove wick 7-.
The working fluid can be brought into direct contact with the heating element 1 by the mesh type wick 7-3 which can be transported by the heating element 1 and is in contact with the heating element 1, so that the cooling efficiency of the heating element 1 is improved. In addition, as shown in FIG.
-1 is composed of the porous material 6-2, so that the working fluid penetrates into the porous material 6-2. 2 can be brought into contact, the condensed working fluid easily returns from the liquid pool portion 9 to the heating element 1, and the cooling efficiency of the heating element 1 is improved.

The number of partitions may be two or more.

[0014]

As described above, the present invention has the following effects. (1) The invention according to claims 1 to 3 divides the inside of the package into two or more spaces, allows a liquid phase to pass through, but blocks a gas phase, and a wick connecting these spaces to each other inside the package. With this arrangement, the pressure inside the package can be applied only to the cross section of the pipe through which the gas-liquid two-phase flow flows, thereby increasing the driving force of the fluid. Goes up. This eliminates the need for a check valve, improves the reliability of fluid circulation, and connects the liquid pool and the boiling portion with a wick to transfer the condensed working fluid to the package heating element to the capillary pressure of the wick. It can be easily returned by using. (2) According to the second aspect of the invention, by using the groove wick as the wick, the boiling portion and the liquid pool portion can be continuously connected. (3) According to the third aspect of the present invention, the cooling efficiency of the heating element is improved by using the groove wick and the mesh wick in combination. (4) According to the fourth aspect of the invention, since the partition and the wick are made of a porous material, the working fluid easily returns from the liquid pool portion to the heating element, and the cooling efficiency of the heating element is improved.

[Brief description of the drawings]

FIG. 1 is a configuration diagram (FIG. 1 (1)) of a capillary pipe according to an embodiment of the present invention, and a perspective view (FIG. 2 (2)) showing the inside of a package 2. FIG.

FIGS. 2A and 2B show the inside of a package 2 using a wick 7-1 and a groove wick 7-2 (FIG. 1A);
2A is a cross-sectional view taken along line AA ′ (FIG. 2B) and FIG. 2B is a cross-sectional view taken along line BB ′ in FIG. 2A.

FIGS. 3A and 3B show the inside of a package 2 in which a groove wick 7-2 and a mesh wick 7-3 are used in combination as a wick 7-1 (FIG. 1A) and a line AA 'in FIG. 3 (1), and a cross-sectional view along the line BB ′ in FIG. 3 (1) (FIG. 3 (3)).

FIG. 4 shows that the partition 6-1 and the wick 7-1 are made of a porous material 6
4 (1) of FIG. 4 showing the inside of the package 2 composed of FIG. 2, a sectional view taken along line AA ′ of FIG. 4 (1) (2) of FIG. It is sectional drawing (3 (3) of the same figure) along the BB 'line.

FIG. 5 is a configuration diagram of a conventional example of a capillary pipe (FIG. 1A) and a perspective view showing the inside of a package 2;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Heating element 2 Package 3 Thin tube 4 Check valve 5 Cooling plate 6-1 Partition 6-2 Porous substance 7-1 Wick 7-2 Groove type wick 7-3 Mesh type wick 8 Boiling part 9 Liquid pool part

Claims (4)

(57) [Claims] 1. At least one package having at least one heating element installed therein, a loop-shaped tube connected to the package at both ends and communicating with the inside of the package, and a predetermined amount enclosed in the package. In a capillary pipe having at least one condensing part provided in the pipe, the inside of the package is divided into two or more spaces, and a liquid phase is allowed to pass therethrough, and a partition for blocking a gas phase is provided. A capillary pipe, wherein a wick connecting the spaces divided by the partitions is arranged inside the package. 2. The capillary pipe according to claim 1, wherein a groove wick is used as said wick. 3. The capillary pipe according to claim 1, wherein a groove wick and a mesh wick are used as said wick. 4. The capillary pipe according to claim 1, wherein said partition and said wick are made of a porous material.