JP4434880B2 - Cooling system and electrical equipment - Google Patents

Description

  The present invention relates to a cooling system that cools a heating element, and an electrical device including the cooling system.

  In an electric apparatus, for example, a notebook personal computer, a cooling system having the following configuration has been proposed as a cooling system for cooling a CPU that is a heating element. In other words, the heat receiving portion is provided with a refrigerant flow path through which liquid refrigerant flows, and is provided so as to be in thermal contact with the CPU that is a heating element, the heat radiating portion having the refrigerant flow path, and the heat receiving portion via the refrigerant flow path. And a circulation pump that is connected to the heat radiating section and circulates the liquid refrigerant through the refrigerant flow path, and is connected to the refrigerant flow path via a communication path to store the liquid refrigerant and to connect the stored liquid refrigerant to the A reserve tank for replenishing the refrigerant flow path through the passage, and taking heat from the CPU by the liquid refrigerant in the heat receiving portion and trying to cool the CPU by releasing the taken heat in the heat radiating portion (For example, see Patent Document 1).

The reserve tank is provided with a liquid injection port (joint), and a liquid refrigerant is injected from the liquid injection port. The inside of the reserve tank and the refrigerant flow path are communicated with each other through a communication path (connection port), so that the liquid refrigerant in the reserve tank and the air in the refrigerant flow path are exchanged via the communication path. It has become.
JP 2004-47922 A

  In the above-described conventional configuration, the liquid injection port for injecting the liquid refrigerant is provided only in the reserve tank, and the refrigerant flow path has no path to the outside of the cooling system. For this reason, when liquid refrigerant is injected from the liquid injection port, the air in the refrigerant flow path and the liquid refrigerant in the reserve tank are exchanged through the communication path, and the liquid refrigerant is filled in the refrigerant flow path. However, the replacement may not be performed smoothly. For this reason, a large amount of air remains in the refrigerant flow path, and the capacity of the liquid refrigerant actually injected may be significantly reduced with respect to the internal volume that can accommodate the liquid refrigerant in the cooling system.

The present invention has been made to solve the above-described problems, and its purpose is to smoothly discharge the air in the refrigerant flow path and the reserve tank to the outside at the time of liquid injection, and a large amount of air remains in them. It is providing the cooling system and electric equipment which can prevent .

To achieve purposes mentioned above, cooling system of the present invention has a refrigerant flow path through which liquid refrigerant, and a heat receiving portion provided in thermal contact with the heating element, the coolant channel A heat dissipating part, a circulation pump connected to the heat receiving part and the heat dissipating part via a refrigerant flow path, and a circulation pump for circulating liquid refrigerant through the refrigerant flow path, connected to the refrigerant flow path via a communication path, A reserve tank that stores the refrigerant and replenishes the stored liquid refrigerant to the refrigerant flow path through the communication path, and removes heat from the heating element by the liquid refrigerant in the heat receiving portion. In the cooling system configured to be discharged in the heat radiating unit, the reserve tank is provided with a first liquid injection port for communicating the inside and outside of the reserve tank, and the refrigerant channel is communicated with the inside and outside of the refrigerant channel. A second liquid inlet provided that, the second liquid inlet is the opening area of the refrigerant passage inside the openings were formed so as to be larger than the opening area of the outer portion from the opening It is characterized by.

  And the electric equipment of this invention was equipped with the said cooling system, It is characterized by the above-mentioned.

According to cooling system of the present invention, the first liquid inlet to the reserve tank is provided, a second liquid inlet in the coolant flow path is provided. For this reason, for example, when liquid refrigerant is injected into the reserve tank from the first liquid injection port, most of the air existing in the refrigerant flow path does not move to the reserve tank side, but the second liquid injection. Smooth discharge from the mouth to the outside. Moreover, the air in a reserve tank comes to be discharged | emitted from the 1st liquid injection port outside. For this reason, it is possible to prevent a large amount of air from remaining in the refrigerant flow path or the reserve tank, and the liquid refrigerant can be filled in almost all the internal volume of the cooling system. Along with this, the amount of liquid refrigerant for replenishment, that is, the internal volume of the reserve tank can be reduced, and the reserve tank, and thus the cooling system including the reserve tank, can be miniaturized.

Then, by using the electrical device the cooling system described above, it becomes possible to miniaturize electric equipment.

Hereinafter, an embodiment of the present invention will be described with reference to FIGS.
First, FIG. 1 shows a configuration diagram of the cooling system 1. The heat receiving part 2 of the cooling system 1 has a refrigerant flow path (not shown) through which the liquid refrigerant flows, and a heating element described later is in thermal contact therewith. The heat receiving portion 2 is configured to receive the heat of the heating element by the liquid refrigerant flowing through the refrigerant flow path. The heat radiating section 3 has a refrigerant flow path (not shown) through which liquid refrigerant flows, and is connected to the heat receiving section 2 by the refrigerant flow path 4. The circulation pump 5 has a suction port 7 and a discharge port 8 outside the case 6, the suction port 7 is connected to the heat radiating part 3 through a refrigerant flow path 9, and the discharge port 8 is connected to the refrigerant. The heat receiving part 2 is connected via the flow path 10.

  Here, although not shown, the circulation pump 5 includes a pump blade, a motor that rotationally drives the pump blade, and a refrigerant passage inside the case 5. When the pump blade is rotated by the motor, the pump blade With this pumping action, the liquid refrigerant is sucked from the suction port 7 and discharged from the discharge port 8, whereby the liquid refrigerant is circulated through the respective refrigerant flow paths 4, 9, 10.

  A reserve tank 15 is provided outside the intermediate portion of the refrigerant flow path 9 that connects between the heat radiating section 3 and the suction port 7 of the circulation pump 5 among the refrigerant flow paths 4, 9, and 10. The refrigerant flow path 9 penetrates the reserve tank 15 in the left-right direction in FIG. A space between the refrigerant flow path 9 and the reserve tank 15 is sealed in a watertight manner. The refrigerant flow path 9 is formed with a communication path 16 formed of holes in the reserve tank 15, and the communication path 16 allows the refrigerant flow path 9 and the reserve tank 15 to communicate with each other.

The reserve tank 15 has a flat rectangular container shape, and is provided with a first liquid injection port 17 that is located in the upper part of FIG. 1 and that allows the inside of the reserve tank 15 to communicate with the outside. The first liquid injection port 17 has a cylindrical portion 18 that protrudes upward. In the state shown in FIG. 1 with the first liquid injection port 17 of the reserve tank 15 facing upward, the upper inner surface 19 (corresponding to the upper portion of the inner wall surface) of the reserve tank 15 is the first as shown in FIG. It inclines so that it may rise toward the liquid injection port 17. In this case, since the reserve tank 15 has a width dimension L1 in the left-right direction that is sufficiently larger than the depth dimension L2, only the inner surfaces 19 on the left and right sides that are the long sides are inclined.

  In the refrigerant flow path 9, a second liquid injection port 20 is provided between the heat radiating unit 3 and the reserve tank 15 and at the highest position of the refrigerant flow path 9. The second liquid injection port 20 allows the inside of the refrigerant flow path 9 to communicate with the outside. The second liquid injection port 20 also has a cylindrical portion 21 that protrudes upward. Further, as shown in FIG. 3, the second liquid injection port 20 is formed such that the opening area of the opening 20a inside the refrigerant channel 9 is larger than the opening area of the portion 20b outside the opening 20a. This is the liquid reservoir 22.

  Now, when the liquid refrigerant is injected into the refrigerant flow path of the cooling system 1 having the above-described configuration, it is performed as follows. First, as shown in FIG. 1, the first liquid injection port 17 of the reserve tank 15 faces upward, and the second liquid injection port 20 of the refrigerant flow path 9 faces upward. In this state, the liquid refrigerant is injected into the reserve tank 15 from the first liquid injection port 17. At this time, the pump blade is appropriately rotated by the motor of the circulation pump 5. Along with this, the liquid refrigerant injected into the reserve tank 15 flows into the refrigerant flow path 9 through the communication path 16, and then in the refrigerant flow path in the circulation pump 5 by the pump action of the circulation pump 5. The refrigerant is injected into the refrigerant channel 10, the refrigerant channel of the heat receiving unit 3, the refrigerant channel 4, the refrigerant channel of the heat radiating unit 3, and the refrigerant channel 9. At this time, most of the air existing in each refrigerant flow path is smoothly discharged to the outside from the second liquid injection port 20 without moving to the reserve tank 15 side. Further, the air in the reserve tank 15 is discharged from the first liquid injection port 17 to the outside.

At this time, since the liquid reservoir 21 is formed inside the refrigerant flow path 9 of the second liquid injection port 20, when the liquid refrigerant passes through the refrigerant flow path 9, the portion of the liquid reservoir 21 is The speed of the liquid refrigerant passing through becomes slow. For this reason, the air (bubbles) contained in the liquid refrigerant passing through the liquid reservoir 21 part is more easily escaped from the second liquid injection port 20 to the outside.
In the reserve tank 15, the upper inner surface 19 is inclined so as to rise toward the first liquid injection port 17, so that the air in the reserve tank 15 rises in the reserve tank 15. It becomes easy to escape from the first liquid injection port 17 along the inner surface 19 to the outside.

In this manner, when the operation of injecting the liquid refrigerant into the refrigerant flow path of the cooling system 1 is completed, the sealing caps 25 and 26 ( (See FIG. 4).
FIG. 4 shows a state in which the cooling system 1 is incorporated in a notebook personal computer 30 as an electric device. At this time, the reserve tank 15 is set so that the first liquid injection port 17 faces sideways. In addition, the CPU 31 that is a heating element to be cooled is arranged in contact with the heat receiving unit 2.

  In the above configuration, when the circulation pump 5 of the cooling system 1 is driven, the liquid refrigerant injected into the refrigerant flow path in the cooling system 1 is circulated by flowing in the direction of arrow A in FIG. At this time, the heat generated by the CPU 31 is taken away by the refrigerant flowing therethrough in the heat receiving unit 2. The refrigerant deprived of heat is radiated in the heat radiating section 3. In this way, the temperature rise of the CPU 31 is suppressed.

  According to the above-described embodiment, the following effects can be obtained. First, in the cooling system 1, a first liquid injection port 17 is provided in the reserve tank 15, and a second liquid injection port 20 is also provided in the refrigerant channel 9. For this reason, for example, when liquid refrigerant is injected into the reserve tank 15 from the first injection port 17, much of the air existing in the refrigerant flow path does not move to the reserve tank 15 side, but the second From the liquid injection port 20 to the outside smoothly. Further, the air in the reserve tank 15 is discharged from the first liquid injection port 17 to the outside. For this reason, it is possible to prevent a large amount of air from remaining in the refrigerant flow path or the reserve tank 15, and the liquid refrigerant can be filled in almost all the internal volume of the cooling system 1. Accordingly, the amount of liquid refrigerant for replenishment, that is, the internal volume of the reserve tank 15 can be reduced, and the reserve tank 15 and thus the cooling system 1 including the reserve tank 15 can be downsized. .

  Further, when liquid refrigerant is injected from the first injection port 17 of the reserve tank 15, the air in the reserve tank 15 rises in the reserve tank 15 and then moves along the inclined upper inner surface 19. It is easy to flow to the liquid injection port 17 and to be discharged from the first liquid injection port 17 to the outside. For this reason, it is possible to prevent a large amount of air from remaining in the reserve tank 15, so that almost all of the internal volume of the reserve tank 15 can be filled with the liquid refrigerant. Accordingly, the amount of liquid refrigerant for replenishment, that is, the internal volume of the reserve tank 15 can be reduced, and the reserve tank 15 and thus the cooling system 1 including the reserve tank 15 can be downsized. .

FIGS. 5A to 5D show first to fourth modifications of the first liquid injection port 17 portion in the reserve tank 15, and the following points are different from the above-described embodiment.
That is, in the first modified example of (a), the inner surface 35 (corresponding to the upper portion of the inner wall surface) of the upper part of the reserve tank 15 has an arc shape upward with the first injection port 17 facing upward. It is a concave slope.
In the second modified example of (b), the inner surface 36 (corresponding to the upper portion of the inner wall surface) of the reserve tank 15 is on the inner side of the reserve tank 15 with the first injection port 17 facing upward. It becomes the inclined surface which becomes the circular arc shape which protrudes to.
In the third modification of (c), the first liquid injection port 17 is disposed at the left corner of the reserve tank 15, and the right inner surface 37 (on the upper portion of the inner wall surface) of the upper inner surface of the reserve tank 15. equivalent) has an inclined surface as increases toward the first liquid inlet 17.
In the fourth modified example of (d), the first liquid injection port 17 has no cylindrical portion 18. In this case, the first liquid injection port 17 is sealed by a sealing stopper (not shown).
In these first to fourth modifications, the same operational effects as those of the above-described embodiment can be obtained.

The present invention is not limited to the above-described embodiment, and can be modified or expanded as follows.
The second liquid inlet 20 may be provided in the refrigerant flow paths 4 and 10 as long as the liquid refrigerant is circulated by the circulation pump 5, and the heat receiving part 2, the heat radiating part 3, or the circulation pump. You may make it provide in the refrigerant | coolant flow path in 5. FIG.
Further, the number of the first liquid injection ports 17 of the reserve tank 15 is not limited to one, and two or more may be provided. Further, the number of second liquid injection ports 20 in the refrigerant flow path 9 is not limited to one, and two or more second liquid injection ports 20 may be provided.
Furthermore, the electrical device on which the cooling system 1 is mounted may be an electrical device other than a personal computer.

1 shows an embodiment of a cooling system of the present invention, and is an overall configuration diagram partially broken away The upper part of a reserve tank is shown, (a) is a top view, (b) is sectional drawing which follows the X1-X1 line of (a), (c) is sectional drawing which follows the X2-X2 line of (a). Enlarged sectional view of the second injection port Configuration diagram of the cooling system built into a notebook personal computer (A)-(d) is sectional drawing which shows the modification of the 1st injection port part of a reserve tank

Explanation of symbols

In the drawings, 1 is a cooling system, 2 is a heat receiving unit, 3 is a heat radiating unit, 4, 9 and 10 are refrigerant flow paths, 5 is a circulation pump, 15 is a reserve tank, and 17 is a first liquid injection port (liquid injection port). ), 18 is a cylinder part, 19 is an inner surface, 20 is a second liquid injection port, 20a is an opening part, 21 is a cylinder part, 22 is a liquid reservoir part, 30 is a personal computer (electric equipment), 35, 36, 37 Indicates the inner surface.

Claims (4)

It has a refrigerant flow path through which liquid refrigerant flows, a heat receiving part provided so as to be in thermal contact with the heating element, a heat radiating part having a refrigerant flow path, and connected to the heat receiving part and the heat radiating part via the refrigerant flow path A circulation pump that circulates the liquid refrigerant through the refrigerant flow path, and is connected to the refrigerant flow path through a communication path to store the liquid refrigerant and to flow the stored liquid refrigerant through the communication path. A cooling system having a reserve tank for replenishing the road, wherein the heat receiving part takes heat from the heating element by the liquid refrigerant and releases the taken heat at the heat radiating part,
A first liquid injection port for communicating the inside and outside of the reserve tank with the reserve tank and a second liquid injection port for communicating the inside and outside of the refrigerant channel with the refrigerant channel ;
The cooling system according to claim 2, wherein the second liquid injection port is formed so that an opening area of an opening inside the refrigerant flow path is larger than an opening area of a portion outside the opening . The first liquid injection port of the reserve tank is in a state in which the reserve tank is in a state in which the first liquid injection port faces upward, and an upper portion of the inner wall surface of the reserve tank is the first liquid injection port. The cooling system according to claim 1, wherein the cooling system is inclined so as to rise toward the mouth . 3. The cooling system according to claim 1, wherein at least one of the first liquid inlet and the second liquid inlet has a cylindrical portion protruding upward .   An electrical apparatus comprising the cooling system according to any one of claims 1 to 3.

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