KR102514094B1 - Cooling device using loop type heat pipe - Google Patents

Abstract

The present invention is a cooling device using a loop heat pipe that is disposed adjacent to a heating element to be cooled and efficiently cools the heating element by dissipating heat through a process in which the working fluid evaporates from a liquid phase to a gas phase and absorbs heat from the heating element. It is about.

Description

Cooling device using loop heat pipe {COOLING DEVICE USING LOOP TYPE HEAT PIPE}

The present invention relates to a cooling device using a loop heat pipe that is disposed adjacent to a heating element to be cooled and can efficiently cool the heating element.

In general, electronic devices such as integrated circuits (ICs) generate a lot of heat during operation. If heat generated at this time is not efficiently dissipated, the integrated circuit may malfunction due to the heat, which may cause malfunction of an electronic device including the integrated circuit.

In particular, electronic devices equipped with CPUs, GPUs, APs, LEDs, etc. may continuously increase heat generated relative to their area due to advancement and high integration, and the importance of cooling these electronic devices is emerging.

Accordingly, there is a demand for the development of a cooling device for rapidly dispersing heat generated from major elements in electronic devices over a wide area.

Republic of Korea Patent Publication No. 10-2008-0102297 (Publication date: 2008.11.24.)

The present invention has been made to solve the above-described problems, and is disposed adjacent to a heating element to be cooled, and the working fluid vaporizes from a liquid phase to a gas phase to efficiently cool the heating element by dissipating heat through a process of absorbing heat from the heating element. Its purpose is to provide a cooling device using a loop heat pipe that allows

A cooling device according to the present invention for realizing the above object is disposed adjacent to a heating element to be cooled, has a receiving space therein, and has a main body having an inlet and an outlet; a working fluid storage compartment provided to accommodate liquid and gaseous working fluids in an upper portion of the accommodation space; A gaseous phase generated while evaporating the liquid working fluid that has absorbed the heat of the heating element and is partitioned from the working fluid storage chamber through a porous separator through which the liquid working fluid can pass through the inner lower part of the accommodation space. a heat absorption chamber in which the working fluid is accommodated; And while the working fluid in the gaseous phase generated in the heat absorption chamber moves along the first transfer pipe through the outlet, it releases heat while being phase-changed into a liquid-phase working fluid, and the phase-changed liquid-phase working fluid passes through the inlet. A heat dissipation unit connected via a second transfer pipe so as to be accommodated in the working fluid storage compartment through a heat dissipation unit, wherein the heat of the heating element is radially diffused in the heat absorption chamber, and the generated gaseous phase is operated. A plurality of guide members for guiding the fluid toward the outlet may be provided.

In this case, the outlet may be disposed biased toward one side of the heat absorption chamber.

In addition, the guide member may include a plurality of first passages arranged radially around the heating element on the inner bottom surface of the heat absorption chamber; and a second passage formed to communicate with the plurality of first passages along an inner rim of the heat absorption chamber and guiding the gaseous working fluid radially flowing along the first passage toward the outlet. there is.

In addition, at least one of the plurality of guide members may include a curved shape toward the outlet.

In addition, at least one of the plurality of guide members may include a communication hole through which the gaseous working fluid flows between the first passages.

The cooling device using the loop heat pipe according to the present invention configured as described above is disposed adjacent to the heating element to absorb heat from the heating element while changing the phase of the working fluid from a liquid phase to a gas phase, transfer the heat, and dissipate the heat dissipation unit spaced apart. There is an advantage in that the heating element can be efficiently cooled by performing heat dissipation in the heat dissipation.

In particular, it may have two effects of dispersing the concentrated heat source of the heating element and transferring heat through a guide member in which a plurality of first flow passages are radially formed.

1 is an overall perspective view of a cooling device using a loop heat pipe according to the present invention;
2 is a partially cutaway perspective view showing the internal configuration of a cooling device using a loop heat pipe according to the present invention;
3 is a cross-sectional side view of a cooling device using a loop heat pipe according to the present invention;
4 is a cross-sectional view taken along line II' of FIG. 3;
5 is an exploded perspective view of a cooling device using a loop heat pipe according to the present invention;
6 is a plan view showing a state in which a guide member is disposed in the heat absorption chamber according to the present invention.

Hereinafter, the configuration and operation of specific embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Here, in adding reference numerals to the components of each drawing, it should be noted that the same components are marked with the same numerals as much as possible, even if they are displayed on different drawings.

1 is an overall perspective view of a cooling device using a loop heat pipe according to the present invention, and FIG. 2 is a partially cut away perspective view showing the internal configuration of a cooling device using a loop heat pipe according to the present invention.

1 and 2, a cooling device 100 using a loop heat pipe according to a preferred embodiment of the present invention includes a main body 110, a working fluid storage chamber 120, a heat absorption chamber 130, A heat dissipation unit 140 may be included.

The detailed description of the configuration of the present invention is as follows.

First, the main body 110 forms the main body of the cooling device 100, and an accommodation space may be provided therein. In addition, an inlet 111 may be provided at an upper portion of the body portion 110 and an outlet port 113 may be provided at a lower portion of the body portion 110 .

In this case, the body portion 110 may be formed of a material having low thermal conductivity such as stainless steel. The main body 110 may absorb heat from the heating element H by being disposed adjacent to the heating element H to be cooled and one surface (a bottom surface in the present invention). The heating element (H) may be in contact with the lower surface of the body portion 110, or may be disposed spaced apart at predetermined intervals.

3 and 4, the working fluid storage chamber 120 is provided on the upper side of the accommodation space, and the working fluid of the liquid phase (L) and the gas phase (G) can be accommodated in the working fluid storage chamber 120. there is. The working fluid may be determined according to the temperature of the heating element H, and may include methanol, ethanol, acetone, distilled water, and the like, which are mainly room temperature working fluids.

In this case, the inside of the working fluid storage chamber 120 may be thermodynamically saturated. Therefore, the working fluid of the gas phase (G) and the working fluid of the liquid phase (L) can be filled therein in a coexisting state. Specifically, at least 50% or more of the volume of the working fluid storage chamber 120 may be filled with the liquid (L) working fluid in the operating environment of the general cooling device 100 for the injection amount of the working fluid. In the working fluid storage chamber 120, the working fluid of the liquid phase (L) may be phase-separated and disposed below the working fluid of the gas phase (G) due to a density difference.

The heat absorption chamber 130 may be formed and partitioned from the working fluid storage chamber 120 via the porous separator 131 at the lower inside of the accommodation space. The porous separator 131 is provided with a plurality of channels 131a so that the working fluid of the liquid phase L stored in the working fluid storage chamber 120 can pass toward the heat absorption chamber 130 .

In this case, the bottom surface of the porous separator 131 and the bottom surface of the heat absorption chamber 130 may be formed parallel to each other. Due to the structure of the heat absorption chamber 130 and the porous separator 131, the contact area between the flat heating element H and the bottom surface of the main body 110 is widened, and the heat absorption chamber 130 and the porous separator (131), heat transfer can be made efficiently.

The heat absorption chamber 130 may contain the working fluid of the gas phase (G) generated while the working fluid of the liquid phase (L) evaporating the heat of the heating element (H). The working fluid of the generated gaseous phase (G) may flow within the heat absorption chamber 130 .

More specifically, the channel 131a of the porous separator 131 may be formed in the form of a plurality of pores. In this case, the porous separator 131 may be formed of a porous metal plate, ceramic plate, or polymer plate.

The porous separator 131 may be made of a material having a flexible thickness and low thermal conductivity so that an appropriate saturation temperature difference is generated on both sides exposed to the working fluid storage chamber 120 and the heat absorption chamber 130, respectively. In addition, the channel 131a may be formed to have a size of 10 μm or less to generate an appropriate capillary pressure difference. Therefore, a large amount of the liquid phase (L) working fluid in the working fluid storage chamber 120 is transferred to the heat absorption chamber 130 by capillary pressure in a state in which it is adsorbed to the porous separator 131 by the adsorption force of the channel 131a or by gravity. can be moved quickly. In addition, the liquid phase (L) working fluid may be phase-changed into a gas phase (G) by receiving heat from the heating element (H) while moving to the heat absorption chamber (130).

As such, the porous separator 131 dividing the accommodation space of the main body 110 into the working fluid storage chamber 120 and the heat absorption chamber 130 removes the working fluid of the liquid phase L in the working fluid storage chamber 120. While supplied to the heat absorption chamber 130, the movement of the working fluid of the gas phase G in the heat absorption chamber 130 to the working fluid storage chamber 120 is blocked. That is, the porous separator 131 selectively moves only the working fluid of the liquid phase L from the working fluid storage chamber 120 between the working fluid storage chamber 120 and the heat absorption chamber 130 to the heat absorption chamber 130. can Therefore, the working fluid of the evaporated gas phase (G) is discharged through the outlet 113 of the heat absorption chamber 130, and at the same time, the working fluid of the liquid phase (L) in the working fluid storage chamber 120 passes through the porous separator 131. It can be supplied to the heat absorption chamber 130 through, so that the continuous circulation of the working fluid can be made.

In this case, the outlet 113 is a part through which the working fluid of the gas phase G generated in the heat absorption chamber 130 is supplied to the heat dissipation unit 140 to be described later. It may be disposed biasedly on one side of the bottom surface. That is, as the heating element H is disposed at the center of the lower surface of the main body 110, the outlet 113 is preferably formed in a portion where the heating element H is not disposed.

On the other hand, as shown in FIG. 5, in the heat absorption chamber 130, the heat of the heating element H is radially diffused, and the working fluid of the gas phase G generated is guided toward the outlet 113. A plurality of guide members 133 may be provided.

Looking in detail with reference to FIG. 6, the guide member 133 includes a plurality of first flow passages 133a arranged radially around the heating element H on the inner bottom surface of the heat absorption chamber 130, It is formed to be in communication with the plurality of first flow passages 133a along the inner rim of the heat absorption chamber 130, and the working fluid of the gas phase G flowing radially along the first flow passage 133a is directed toward the outlet 113. A second passage 133b for guiding may be included.

That is, in the heat absorption chamber 130, when the area of the heating element H is small, the heating element H may be positioned at the center of the radially arranged guide member 133. Accordingly, heat can be efficiently diffused from the concentrated heat source at the center of the guide member 133 along the radially formed first flow path 133a. After the working fluid of the liquid phase (L) is changed to the working fluid of the gas phase (G) by the heat diffused in this way, it can be discharged through the outlet 113 along the second flow path (133b).

In other words, the plurality of first flow passages 133a may have two effects of dispersing the concentrated heat source of the heating element H and transferring heat through the guide member 133 formed radially.

In this case, the guide member 133 may face the bottom surface of the porous separator 131, but is not limited thereto, and the guide member 133 may be formed to be spaced apart from the bottom surface of the porous separator 131 at a predetermined interval. (See Fig. 3).

In another embodiment, at least one of the plurality of guide members 133 may be bent (not shown) toward the outlet 113 . Accordingly, the working fluid of the gas phase (G) can be more smoothly discharged toward the discharge port 113 along the guide member 133 .

In another embodiment, the plurality of guide members 133 may include a communication port (not shown) to allow the working fluid of the gas phase G to flow between the first passages 133a. Communication spheres formed on each guide member 133 may be arranged in a zigzag pattern. Accordingly, a turbulent flow may be formed while the working fluid of the gas phase G in the first flow path 133a flows mutually. As turbulent flow is formed, heat transfer may become active. Accordingly, vaporization of the working fluid of the liquid phase (L) into the working fluid of the gas phase (G) can be promoted, and eventually the cooling efficiency of the heating element (H) using the cooling device 100 can be improved.

Referring back to FIG. 3, the heat dissipation unit 140 moves the working fluid of the gas phase G generated in the heat absorption chamber 130 along the first transfer pipe 141 through the outlet 113, and at the same time the liquid phase ( As the phase changes to the working fluid of L), heat can be released. In addition, the heat dissipation part 140 may be connected to the inlet 111 of the body part 110 through the second transfer pipe 143 . Accordingly, the working fluid of the liquid phase (L) phase-changed in the heat dissipation unit 140 may be stored again in the working fluid storage chamber 120 through the second transfer pipe 143 connected to the inlet 111 .

In this case, the heat dissipation unit 140 may be a condensation tube (not shown) in which the working fluid of the gas phase (G) is phase-changed into the working fluid of the liquid phase (L). The condensation tube may have a structure bent in a zigzag shape.

In addition, flexible bellows tubes may be used for the first and second transfer pipes 141 and 143. Accordingly, deformation according to a change in position of the heat absorption chamber 130 and the heat dissipation unit 140 may be facilitated.

Then, the operation of the cooling device 100 using the loop heat pipe according to the present invention configured as described above will be described.

First, when the heating element H to be cooled generates heat, the working fluid of the liquid phase L existing inside the working fluid storage chamber 120 disposed adjacent to the heating element H passes through the porous separator 131 to the heat absorption chamber ( 130).

The working fluid of the liquid phase (L) moved to the heat absorption chamber 130 absorbs heat, and accordingly, the working fluid of the liquid phase (L) is changed to the working fluid of the gas phase (G). At this time, the working fluid of the gas phase (G) radially diffuses the heat of the heating element (H) along a plurality of guide members (133) disposed radially in the heat absorption chamber (130), and also of the generated gas phase (G). It guides the working fluid toward the outlet 113 (see FIG. 6).

The working fluid of the gas phase (G) guided along the guide member 133 toward the discharge port 113 moves toward the heat dissipation unit 140 along the first transfer pipe 141 connected to the discharge port 113, and then heat dissipation is performed. It can be liquefied into a liquid (L) working fluid.

The working fluid of the liquid phase (L) flows back into the working fluid storage chamber 120 through the inlet 111 along the second transport pipe 143, and as this cycle is repeated, the heating element H can be cooled.

In the above, the present invention has been shown and described with specific specific examples, but the present invention is not limited to the above-described embodiments, and various changes and modifications are possible without departing from the technical spirit of the present invention.

100: cooling device 110: main body
111: inlet 113: outlet
120: working fluid storage chamber 130: heat absorption chamber
131: porous separator 131a: channel
133: guide member 133a: first flow path
133b: second flow path 140: heat sink
141: first transfer pipe 143: second transfer pipe
G: Gas phase H: Heating element
L: Liquid

Claims (5)

a main body portion disposed adjacent to a heating element to be cooled, having an accommodation space therein, and having an inlet and an outlet;
a working fluid storage compartment provided to accommodate liquid and gaseous working fluids in an upper portion of the accommodation space;
A partition is formed with the working fluid storage chamber through a porous separator through which the liquid working fluid can pass at the inner lower side of the accommodation space, and a gaseous phase generated while the liquid working fluid absorbing heat from the heating element evaporates a heat absorption chamber in which the working fluid is accommodated; and
The working fluid in the gaseous phase generated in the heat absorption chamber moves along the first transfer pipe through the outlet and at the same time is phase-changed into a liquid-phase working fluid to release heat, and the phase-changed liquid-phase working fluid passes through the inlet Including; a heat dissipation unit connected via a second transfer pipe so as to be accommodated in the working fluid storage chamber,
The outlet is disposed biased toward one side of the heat absorption chamber,
A plurality of guide members are provided in the heat absorption chamber to radially diffuse the heat of the heating element and guide the generated gaseous working fluid toward the outlet,
The guide member,
A plurality of first flow passages arranged radially around the heating element on the inner bottom surface of the heat absorption chamber; A cooling device comprising a; second flow path for guiding the gaseous working fluid flowing radially along the outlet toward the outlet.
delete delete According to claim 1,
At least one of the plurality of guide members,
A cooling device comprising a bent shape toward the outlet.
According to claim 4,
At least one of the plurality of guide members,
A cooling device comprising a communication port through which the working fluid of the gaseous phase can flow between the first passages.

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