KR20220108996A - Cooling device using loop type heat pipe - Google Patents

Abstract

The present invention relates to a cooling device using a loop type heat pipe, which is disposed to be adjacent to a heating element to be cooled and dissipates heat through a process in which working fluid vaporizes from a liquid phase to a gas phase and absorbs heat from the heating element, to efficiently cool the heating element.

Description

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

The present invention relates to a cooling device using a loop heat pipe disposed adjacent to a heating element to be cooled and capable of efficiently cooling the heating element.

In general, an electronic device such as an integrated circuit (IC) generates a lot of heat during operation. In this case, if the generated heat is not efficiently dissipated, the integrated circuit may malfunction due to the heat, which may cause a malfunction of the electronic device including the integrated circuit.

In particular, electronic devices equipped with CPUs, GPUs, APs, LEDs, etc. may continuously increase heat generated relative to the area according to the 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 spreading the heat generated by the main elements in the electronic device to a wide area.

Republic of Korea Patent Publication No. 10-2008-0102297 (published on: November 24, 2008)

The present invention has been devised to solve the above-described problems, and is disposed adjacent to a heating element to be cooled to perform heat dissipation through a process of absorbing the heat of the heating element while the working fluid is vaporized from a liquid to a gaseous phase, thereby efficiently cooling the heating element. An object of the present invention is to provide a cooling device using a single loop heat pipe.

A cooling device according to the present invention for realizing the above object includes: a body portion disposed adjacent to a cooling target heating element, a receiving space provided therein, and an inlet and an outlet provided; a working fluid storage chamber provided so as to accommodate liquid and gaseous working fluids in an upper inner portion of the accommodating space; A gas phase generated as the working fluid storage chamber and the working fluid storage chamber are partitioned through a porous separation plate through which the liquid working fluid can pass at the lower inner side of the receiving space, and the liquid working fluid that has absorbed the heat of the heating element evaporates a heat absorption chamber in which the working fluid is accommodated; and the gaseous working fluid generated in the heat absorption chamber moves along the first transfer pipe through the outlet and at the same time phase changes into a liquid working fluid to release heat, and the phase-changed working fluid in the liquid phase moves through the inlet. a heat dissipation unit connected via a second transfer pipe to be accommodated in the working fluid storage chamber through the heat dissipation chamber; A plurality of guide members for guiding the fluid toward the outlet; may be provided.

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

In addition, the guide member may include: a plurality of first flow passages disposed on an inner bottom surface of the heat absorption chamber in a radial direction with respect to the heating element; and a second flow path formed in communication with the plurality of first flow paths along the inner edge of the heat absorption chamber and guiding a gaseous working fluid radially flowing along the first flow path toward the outlet. have.

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

Also, at least one of the plurality of guide members may include a communication hole so that the gaseous working fluid flows between the first flow passages.

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

In particular, it is possible to have two effects: an effect of dispersing the concentrated heat source of the heating element through the guide member in which the plurality of first flow paths are radially formed, and an effect of transferring heat.

1 is an overall perspective view of a cooling device using a loop heat pipe according to the present invention;
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;
3 is a side cross-sectional 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 the 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 only the same components are marked with the same reference numerals as much as possible even though 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 an internal configuration of a cooling device using a loop heat pipe according to the present invention.

1 and 2, the 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 configuration of the present invention will be described in detail as follows.

First, the main body 110 constitutes 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 main body 110 , and an outlet 113 may be provided at a lower portion of the main body 110 .

In this case, the body part 110 may be formed of a material having low thermal conductivity, such as stainless steel. The main body 110 may have one surface (a bottom surface in the present invention) disposed adjacent to the cooling target heating element H to absorb the heat of the heating element H. The heating element H may be in contact with the bottom surface of the main body 110 or may be disposed to be spaced apart from each other by a predetermined interval.

3 and 4, the working fluid storage chamber 120 is provided on the inner 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 . have. 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 maintained in a saturated state. Therefore, the working fluid of the gas phase (G) and the working fluid of the liquid phase (L) can be filled in the coexisting state. Specifically, the injection amount of the working fluid may be filled with the working fluid of the liquid (L) at least 50% of the volume of the working fluid storage chamber 120 in a general operating environment of the cooling device 100 . In the working fluid storage chamber 120, the working fluid of the liquid phase (L) may be disposed to be phase-separated below that of the working fluid of the gas phase (G) due to a density difference.

The heat absorption chamber 130 may be provided by being partitioned from the working fluid storage chamber 120 through the porous separator 131 on the inner lower side of the accommodating 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 are widened. (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) that has absorbed the heat of the heating element (H) is evaporated. The generated gaseous (G) working fluid may flow in 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 micropores. In this case, the porous separator 131 may be formed of a porous metal plate, a ceramic plate, or a 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 in order to generate an appropriate capillary pressure difference. Therefore, a large amount of the liquid (L) working fluid in the working fluid storage chamber 120 is adsorbed to the porous separator 131 by the adsorption force or gravity of the channel 131a to the heat absorption chamber 130 by capillary pressure. can be moved quickly. In addition, the liquid (L) working fluid may receive heat from the heating element (H) while being moved to the heat absorption chamber (130) to be phase-changed into the gaseous (G).

In this way, the porous separating plate 131 that divides the receiving space of the main body 110 into the working fluid storage chamber 120 and the heat absorption chamber 130 stores the working fluid of the liquid (L) in the working fluid storage chamber 120 . While supplying to the heat absorption chamber 130, the working fluid of the gas phase (G) in the heat absorption chamber 130 is blocked from moving toward the working fluid storage chamber (120). That is, the porous separating plate 131 selectively moves only the working fluid of the liquid phase (L) from the working fluid storage chamber 120 to the heat absorption chamber 130 between the working fluid storage chamber 120 and the heat absorption chamber 130 . can Therefore, the working fluid of the vapor phase (G) evaporated 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 forms the porous separator plate 131. It may be supplied to the heat absorption chamber 130 through the heat absorption chamber 130, and thus the continuous circulation of the working fluid can be achieved.

In this case, the outlet 113 is a portion in 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 to be biased toward one side of the bottom surface. That is, as the heating element H is disposed in the center of the bottom 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, the heat of the heating element (H) is diffused radially in the heat absorption chamber 130, and the working fluid of the generated gaseous phase (G) is guided toward the outlet 113 side. A plurality of guide members 133 may be provided.

6 , the guide member 133 includes a plurality of first flow paths 133a disposed radially around the heating element H on the inner bottom surface of the heat absorption chamber 130 and provided; The working fluid of the gas phase (G) formed in communication with the plurality of first flow passages 133a along the inner edge of the heat absorption chamber 130 and flowing radially along the first flow passage 133a is directed toward the outlet 113. A second flow path 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 disposed guide member 133 . Accordingly, heat may be efficiently diffused along the first flow path 133a radially formed from the concentrated heat source at the center of the guide member 133 . 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 may be discharged through the outlet 113 along the second flow path 133b.

In other words, it is possible to have two effects: an effect of dispersing the concentrated heat source of the heating element H through the guide member 133 in which the plurality of first flow paths 133a are radially formed, and an effect of transferring heat.

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 by a predetermined distance. (See Fig. 3).

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

In another embodiment, the plurality of guide members 133 may include a communication port (not shown) so that the working fluid of the gas phase G flows between the first flow paths 133a. The communication holes formed in each guide member 133 may be arranged in a zigzag manner. Accordingly, the working fluid of the gas phase G in the first flow path 133a may form a turbulent flow while mutually flowing. As turbulence is formed, heat transfer may be active. Accordingly, it is possible to promote the vaporization of the working fluid of the liquid phase (L) into the working fluid of the gas phase (G), and consequently, it is possible to improve the cooling efficiency of the heating element (H) using the cooling device (100).

Referring back to FIG. 3 , the heat dissipation unit 140 moves along the first transfer pipe 141 through the discharge port 113 while the working fluid of the gas phase (G) generated in the heat absorption chamber 130 moves along the liquid phase ( It can release heat as the phase changes to the working fluid of L). In addition, the heat dissipation unit 140 may be connected to the inlet 111 of the body unit 110 via the second transfer pipe 143 . Accordingly, the working fluid of the liquid phase L changed in the heat dissipation unit 140 may be received 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 condensing pipe (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, the first and second transfer pipes 141 and 143 may use flexible bellows tubes. Accordingly, it may be easily deformed according to a change in the positions of the heat absorption chamber 130 and the heat dissipation unit 140 .

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

First, when the heating element to be cooled (H) is heated, the liquid (L) working fluid present in the working fluid storage chamber 120 disposed adjacent to the heating element (H) is transferred to the heat absorption chamber ( 130) will be moved to.

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 the plurality of guide members 133 radially disposed in the heat absorption chamber 130, as well as 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 toward the outlet 113 along the guide member 133 moves toward the heat dissipation unit 140 along the first transfer pipe 141 connected to the outlet 113, and then heat dissipation is performed. It can be liquefied into the working fluid of the liquid phase (L).

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

In the above, the present invention has been illustrated and described with reference to specific specific embodiments, 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: body part
111: inlet 113: outlet
120: working fluid storage room 130: heat absorption room
131: porous separator 131a: channel
133: guide member 133a: first flow path
133b: second flow path 140: heat dissipation part
141: first transfer pipe 143: second transfer pipe
G: gas phase H: heating element
L: liquid

Claims (5)

a body portion disposed adjacent to the cooling target heating element, having an accommodation space therein, and having an inlet and an outlet;
a working fluid storage chamber provided so as to accommodate liquid and gaseous working fluids in an upper inner portion of the accommodating space;
A gas phase generated as the working fluid storage chamber and the working fluid storage chamber are partitioned through a porous separation plate through which the liquid working fluid can pass at the lower inner side of the receiving space, and the liquid working fluid that has absorbed the heat of the heating element evaporates a heat absorption chamber in which the working fluid is accommodated; and
The gaseous working fluid generated in the heat absorption chamber is moved along the first transfer pipe through the outlet and at the same time phase is changed into a liquid working fluid to release heat, and the phase-changed working fluid in the liquid phase is passed through the inlet. A heat dissipation unit connected via a second transfer pipe to be accommodated in the working fluid storage chamber;
and a plurality of guide members for radially diffusing the heat of the heating element and guiding the generated gaseous working fluid toward the outlet in the heat absorption chamber.
According to claim 1,
The outlet is
A cooling device that is biased toward one side of the heat absorption chamber.
According to claim 1,
The guide member,
a plurality of first flow passages disposed on the inner bottom surface of the heat absorption chamber in a radial direction with respect to the heating element; and
A cooling device comprising a; a second flow path formed in communication with the plurality of first flow passages along the inner edge of the heat absorption chamber and guiding a gaseous working fluid radially flowing along the first flow passage toward the outlet. .
4. The method of claim 3,
At least one of the plurality of guide members,
Cooling device comprising a curved shape toward the outlet.
5. The method of claim 4,
At least one of the plurality of guide members,
A cooling device including a; communication port to allow the gaseous working fluid to flow between the first flow passages.

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