JP4134884B2 - Cooling system - Google Patents

Description

  The present invention relates to a cooling device for an electronic device that cools a heat generating electronic component such as a microprocessor (hereinafter referred to as a CPU) disposed inside a casing by circulating a refrigerant.

  The recent trend of speeding up in computers is extremely rapid, and the clock frequency of the CPU has become much larger than before. As a result, the amount of heat generated by the CPU increases. Especially in small electronic devices such as notebook computers, the ability to cool with a heat sink is insufficient, and a high-efficiency and high-power cooling device is indispensable. ing.

  Hereinafter, a conventional electronic apparatus cooling apparatus that circulates and cools such a refrigerant will be described. Note that in this specification, an electronic device is mainly a device that loads a program into a CPU or the like, a desktop computer, or a small portable device such as the above-described notebook computer. In addition, all devices equipped with heat generating electronic components that generate heat when energized are included. As this conventional cooling device, for example, the one shown in FIG. 6 is known (see, for example, Patent Document 1). FIG. 6 is a configuration diagram of a conventional electronic apparatus cooling apparatus. In FIG. 6, 100 is a metal casing, 101 is a heat generating electronic component, 102 is a substrate on which the heat generating electronic component 101 is mounted, 103 is a refrigerant and circulates heat and exchanges heat between the heat generating electronic component 101 and the refrigerant. A heat receiving pump unit such as a reciprocating pump for cooling the heat generating electronic component 101, 104 a water passage for circulating the refrigerant, 105 a radiator for removing heat from the refrigerant, and 106 a heat radiating fan for air cooling the radiator 105. The heat receiving pump 103 is used as a heat receiving header, and the heat receiving portion and the pump portion are integrated.

The operation of the conventional cooling device will be described. The refrigerant discharged from the heat receiving pump unit 103 is sent to the radiator 105 through the water passage 104. Here, the air is forcibly cooled by the heat radiating fan 106 and the temperature drops, and the process returns to the heat receiving pump unit 103 again. In this way, the heat generating electronic component 101 is cooled by circulating the refrigerant.
JP-A-7-142886

  However, in the conventional cooling device, when the heat conductivity of the casing serving as the heat receiving unit of the heat receiving pump unit 103 is low, the amount of heat exchange with the refrigerant is reduced, and further improvement in cooling efficiency cannot be expected. Further, a reciprocating pump or the like has a complicated structure, and there are limits to downsizing and thinning.

  In view of this, the present applicant has proposed a contact heat exchange type turbo pump capable of circulating a large amount of refrigerant as the heat receiving pump unit 103, and heat exchange is performed by bringing the pump casing into close contact with the heat generating electronic component 101. Compared with the above-described conventional cooling device, the cooling device proposed by the present applicant can be reduced in size and thickness, and can be cooled with high efficiency. However, in order to further improve the cooling efficiency, a metal casing with high thermal conductivity is provided. As a result, the motor efficiency was lowered and the cooling efficiency was not improved. In particular, copper is the most suitable casing material in terms of heat transfer, but when this is adopted, the motor efficiency is significantly reduced. In addition, the pump casing, which has been reduced in size and thickness, must be processed as a unit including part of the surrounding flow path configuration (including the joint portion), but the shape is complicated due to its small size, and it is processed with metal. It became difficult.

The present inventors diligently investigated the cause of the reduction in motor efficiency, and obtained the following knowledge. That is, when the pump casing is made of metal, the motor efficiency decreases because the heat receiving pump section 103 is composed of a magnet and a stator provided on the impeller. This is because an eddy current is generated in the metal pump casing when it rotates. Furthermore, this was converted into heat, which hindered improvement in cooling efficiency.

  Therefore, an object of the present invention is to provide a cooling device that can be reduced in size and thickness while improving cooling efficiency and motor efficiency, and has a simple structure.

The present invention is a cooling device provided with a contact heat exchange type centrifugal pump, wherein the centrifugal pump is brought into contact with a heat generating electronic component, heat is taken from the heat generating electronic component by heat exchange action of an internal refrigerant, and heat is radiated from a radiator. a is the pump chamber of the centrifugal pump is constructed by fitting the first casing and the second casing, with a contact surface for contacting the heat-generating electronic component while being formed in the first casing gold metal material The main feature is that the second casing is molded of resin.

  According to the cooling device of the present invention, it is possible to realize a cooling device that can be reduced in size and thickness while improving the cooling efficiency and the motor efficiency, and has a simple structure.

Cooling apparatus according to the present invention, the pump chamber of the centrifugal pump is configured fitted the first casing and the second casing, the contact surface for contacting the heat-generating electronic component while being composed of a first casing gold metal material Since the second casing is formed of resin, the structure is simple, and the size and thickness can be reduced while improving the cooling efficiency and the motor efficiency.

According to a first aspect of the present invention for solving the above problems, a closed circuit for circulating a refrigerant is provided with a radiator and a contact heat exchange type centrifugal pump. This is a cooling device that takes heat from the heat-generating electronic component by the heat exchange action of the refrigerant and radiates heat from the radiator, and is configured by fitting the first casing and the second casing in the pump chamber of the centrifugal pump, comprising a contact surface for contacting the heat-generating electronic component while being formed in the first casing gold metal material, a and cooling device in which the second casing is molded with resin, no current loss is generated, the motor A reduction in efficiency can be prevented, and the heat dissipation efficiency does not decrease. Manufacture is facilitated by using the second casing as a resin.

The second aspect of the present invention, in the first aspect, are integrally formed, including a portion of the suction passage in the first casing gold metal material, and a second casing of the discharge port portion and the suction passage of resin The cooling device is integrally formed with other parts, and the pump casing can be easily manufactured by integrally forming a part of the suction passage, which is difficult to process with the metal first casing, with the resin.

A third invention of the present invention, in the second invention, the grooves constituting the one side of the intake write path are formed integrally of a metal material as part of the suction path, the other part of the suction passage is a groove a cooling device combinations are sealing part for water sealing between the pump chamber and the suction write channel closing, as the sealing portion combining portion during processing is difficult pump chamber and the suction passage, the first casing groove It is only necessary to form an easy-to-process combination sealing portion in the second casing, and the pump casing can be easily processed.

A fourth invention of the present invention is the cooling device according to the third invention, wherein the combination sealing portion is a sealing piece provided in the second casing to close the groove and partition the pump chamber and the suction passage. Since the difficult part between the pump chamber and the suction passage is formed integrally with the first casing with the sealing piece, it is only necessary to form a groove in the first casing and a sealing piece in the first casing. Processing becomes easy.

  5th invention of this invention is a cooling device which is a holding | maintenance part provided in the 2nd casing in which the combination sealing part can mount | wear with the separate sealing member for plugging up a groove | channel in 3rd invention. In order to make the basic structure of the suction path difficult to process with the groove of the first casing and water-sealing with a separate sealing member, the holding structure in which the groove is attached to the first casing and the sealing member is attached to the second casing The pump casing can be easily processed.

  According to a sixth aspect of the present invention, in any one of the first to fifth aspects, the first casing is provided with a cylindrical thick portion for forming one side surface of the pump chamber and a flange for coupling the casing. The second casing is provided with a fitting portion into which the cylindrical thick portion is fitted, the cylindrical thick portion is inserted into the fitting portion, and the flange is fixed to the fitting portion by the fastening means. There is a difference in thermal expansion between the first casing made of metal and the second casing made of resin, and simply by fixing with the fastening means, the expansion force concentrates on this fastening means, and the sealing performance is reduced. An air layer is formed between the contacting surfaces due to the looseness of the fastening portion, and heat transfer is hindered, but this can be prevented by the contact between the cylindrical thick portion and the fitting portion.

  A seventh invention of the present invention is the cooling device according to any one of the first to sixth inventions, wherein the fitting portion is provided with a stepped portion that contacts and positions the cylindrical thick portion, and is securely fitted. This improves the sealing performance and reduces the possibility of heat transfer being interrupted by a layer of hot air.

  An eighth invention of the present invention is the cooling device according to any one of the first to seventh inventions, wherein the first casing or the second casing is divided into a plurality of pieces, and the first casing or the second casing. Can be composed of a plurality of pieces, which increases the degree of freedom of design.

According to a ninth aspect of the present invention, a closed circuit for circulating a refrigerant is provided with a radiator and a contact heat exchange type centrifugal pump, and the centrifugal pump is brought into contact with a heat generating electronic component so that the heat exchange action of the internal refrigerant is achieved. In the cooling device for removing heat from the heat generating electronic components and radiating heat from the radiator, the centrifugal pump has a pump chamber for housing the pump impeller fitted with the first casing, the second casing, and the third casing. is constituted by coupling, a resin material heat-generating electronic component and provided with a contact surface for contacting the second casing includes a joint portion of the suction passage and the discharge passage while being formed in the first casing gold metal material The third casing is a cooling device that covers the back side of the pump impeller and is fitted with the second casing to be formed of a resin material, and is a joint between the suction passage and the discharge passage that is difficult to process and assemble. To form only in minutes, machining and assembly is much easier as a whole.

(Example 1)
1 is a perspective view of an electronic apparatus provided with a cooling device according to a first embodiment of the present invention, FIG. 2 is a cross-sectional view of a centrifugal pump of the cooling device according to the first embodiment of the present invention, and FIG. FIG. 3B is a cross-sectional view of the lower casing of FIG. 3A, and FIG. 3C is a side view of the lower casing of FIG. 3A.

In FIG. 1, 1 is a casing of a notebook computer as an electronic device equipped with a cooling device, 2 is a keyboard of the notebook computer, 3 is a contact heat exchange type centrifugal pump for constituting the cooling device, and 4 is a CPU. It is a heat generating electronic component such as a chip component having a flat surface. 5 is a substrate on which the heat generating electronic component 4 is mounted, 6 is a radiator that is provided on the back of the display of the notebook computer and dissipates the heat of the refrigerant received from the heat generating electronic component 2 to the outside, and 7 is the centrifugal pump 3 and the heat radiator 6. Is a closed circulation path for circulating the refrigerant. As this refrigerant, a propylene glycol aqueous solution is suitable, and since copper is used as a casing material as will be described later, it is desirable to add an anticorrosive additive.

  The radiator 6 is made of a material having high thermal conductivity and good heat dissipation, for example, a thin plate material such as copper or aluminum, and has a refrigerant passage and a reserve tank formed therein. Further, a fan may be provided to increase the cooling effect by forcibly applying air to the radiator 6 for cooling. The circulation path 7 is composed of a rubber tube such as a flexible rubber having a low gas permeability, for example, butyl rubber, in order to ensure freedom of piping layout.

Next, the internal configuration of the contact heat exchange type centrifugal pump 3 will be described with reference to FIG. In FIG. 2, 11 is an open impeller of the centrifugal pump 3, 12 is an open impeller of the impeller 11, and 13 is a magnet rotor provided on the outer peripheral side of the impeller 11. Although the impeller 11 may be configured separately from the magnet rotor 13, the impeller 11 is preferably an integrated impeller 11 magnetized in a portion that becomes the magnet rotor 13. The specifications of the pump of Example 1 are as follows: thickness 3 mm to 20 mm, representative radial dimension 10 mm to 70 mm, rotation speed 600 rpm to 4000 rpm, flow rate 0.01 L / min to 1.5 L / min, head 0. In terms of 1 m to 2 m and specific speed, it is about 12 to 200 (unit: m, m ³ / min, rpm).

  14 is a stator provided on the inner peripheral side of the magnet rotor 13, and 15 is an upper pump casing for accommodating the impeller 11 and simultaneously recovering the kinetic energy imparted to the fluid by the impeller 11 and guiding it to the discharge port ( (Second casing of the present invention), 15a is a pump chamber for recovering the pressure of the kinetic energy given by the open blades 12 and leading it to the discharge passage, 15b receives a cylindrical thick part 16a described later and receives the upper surface thereof. A stepped portion 15 a that contacts and is positioned on the side surface, 15 c is a ring-shaped fitting portion that is fitted to the side surface of the cylindrical thick portion 16 a and is in contact with the upper surface of the flange portion 22 described later, and 15 d is a suction passage 19 that is described later. It is a sealing piece that covers the upper part of the groove 19b to be formed.

  In the first embodiment, a combination sealing portion in which the sealing piece 15d is water-sealed between the pump chamber 15a and the suction passage 19 by a combination with the groove 19b is employed. However, the combination sealing portion is not limited to this, and may be configured as shown in FIG. 4A is a cross-sectional view of a centrifugal pump equipped with the sealing member of Example 1 of the present invention, and FIG. 4B is a front view of the sealing member of FIG. 4A and 4B, 15e is a holding portion provided in the upper pump casing 15, 25 is a sealing cylindrical tube (separate sealing member of the present invention), and 25a is a sealing cylindrical tube 25. It is a sealing piece for closing the provided groove 19b. In addition, the notch part formed in the upper part of the cylindrical tube 25 for sealing of FIG.4 (b) is a communicating port from the pump chamber 15a to a discharge path. The sealing cylindrical tube 25 is used by being fitted to the holding portion 15e, the fitting portion 15c, and the side surface of the cylindrical thick portion 16a. In the case of this configuration, the suction passage 19 that is difficult to process is sealed with a groove 19b and a separate sealing cylindrical tube 25, so the upper pump casing 15 is provided with a holding portion 15e for the sealing cylindrical tube. The processing of the suction passage 19 is facilitated.

2 shows a lower casing (first casing of the present invention) in which the pump chamber 15a is sealed after the impeller 11 is housed and is in contact with the heat generating electronic component 4 on the lower surface, and 16b is in contact with the heat generating electronic component 4. A contact surface 17 is provided on the upper pump casing 15 and is a fixed shaft for rotatably supporting the impeller 11, and 18 is a bearing provided at the center of the impeller 11 and mounted on the fixed shaft 17. . 19 is a suction path, 19a is a water inlet. Although not shown in FIG. 2, the discharge path is provided to extend in the radial direction from the pump chamber 15 a in parallel with the suction path 19. In Example 1, in order to make the arrangement of the entire cooling device compact and not to deteriorate the pump characteristics, the cooling device is extended in the radial direction in parallel with the suction passage 19, but is not limited thereto. The lower surface (contact surface) of the lower casing 16 has a complementary shape so that the heat generating electronic component 4 can be brought into contact with the surface shape of the heat generating electronic component 4 to exchange heat. Usually the two shapes are flat.

  20 is a control board for rotating the magnet rotor 13 of the outer rotor as a motor unit composed of the magnet rotor 13 and the stator 14 as a DC brushless motor, and 21 is a shaft support part protruding from the lower casing 16 into the water inlet 19a. In addition, a hole for inserting the fixed shaft 17 is formed in the shaft support portion 21. Reference numeral 22 denotes a flange formed in a ring shape with the same width around the lower casing 16, reference numeral 23 denotes fastening means such as screws for connecting the upper pump casing 15 and the lower casing 16 in a fitted state, and reference numeral 24 denotes an upper pump. A seal member that seals between the casing 15 and the lower casing 16.

  Further, FIGS. 3A, 3B, and 3C will be described. 3A, 3B, and 3C show details of the lower casing 16, and 16a has a diameter slightly larger than the diameter of the impeller 11, and is fitted to the fitting portion 15c of the upper pump casing 15. FIG. In combination, a cylindrical thick portion 19b is formed on the inner surface of the lower casing 16 to cover the side surface of the lower casing 16 together with the surrounding flange portion 22 to form the pump chamber 15a, and is a sealing piece 15d of the upper pump casing 15. A groove 22 a that is covered to form the suction path 19 is a fastening hole that is formed in the flange portion 22 and into which the fastening means 23 is inserted. The sealing piece 15 d covers one side surface of the groove 19 b and serves as a separation plate that partitions between the pump chamber 15 a and the suction passage 19. When the above-described sealing cylindrical tube 25 is used, this sealing cylindrical tube 25 is a separation plate, and the suction cylindrical passage 25 is configured by inserting the sealing cylindrical tube 25 into a holding portion provided in the upper pump casing 15.

  In the first embodiment, the upper surface of the cylindrical thick portion 16a is in contact with the step portion 15b of the upper pump casing 15, but the step portion 15b is not provided, and the flange portion 22 is provided on the lower surface of the fitting portion 15c. The insertion depth may be defined by the height thereof. Further, the metal portion of the lower casing 16 is not necessary and sufficient to transfer heat from the heat generating electronic component 4 instead of the entire bottom surface of the lower casing 16 that fits into the upper pump casing 15 as in the first embodiment. The partial configuration may be used.

  The upper pump casing 15 and the lower casing 16 are preferably two pieces as in the first embodiment in consideration of assembly and heat transfer. However, in some cases, the upper pump casing 15 and the lower casing 16 may be processed in order to make the processing and assembly easier. It is also preferable that each of the casing 15 and / or the lower casing 16 is composed of a plurality of pieces. In this case, the degree of freedom in design increases. In particular, it is difficult to process the joint portion of the upper pump casing 15, and it is preferable to use two pieces. This will be described below. FIG. 5 is a cross-sectional view of a centrifugal pump constituted by a three-piece pump casing according to the first embodiment of the present invention.

  In FIG. 5, reference numeral 26 denotes a joint casing portion (the main casing portion) which is fitted to the lower casing 16 (first casing of another embodiment of the first embodiment of the present invention) and is connected to an external suction pipe and an external discharge pipe (not shown). The second casing 27 of another embodiment of the first embodiment of the invention is fitted to the joint casing portion 26 so as to cover the rear side of the impeller 11 (opposite to the water suction port 19a) and is fitted to the joint casing portion 26. It is the 2nd upper pump casing (3rd casing of another mode of Example 1 of the present invention) which constitutes the pump casing of centrifugal pump 3 with lower casing 16. In this configuration, the joint casing portion 26 is formed of a resin material including the joint portions of the suction passage 19 and the discharge passage, and the second upper pump casing 27 covers the back surface of the impeller 11 and is fitted with the joint casing portion 26. Since they are formed of a resin material, processing and assembly are much easier than when the upper pump casing 15 is integrally formed.

In assembling the centrifugal pump 3 of the first embodiment, the stator 14 and the fixed shaft 17 are disposed in the upper pump casing 15, the bearing 18 is inserted into the fixed shaft 17, and the impeller 11 provided with the magnet rotor 13. The cylindrical thick portion 16a is inserted into the upper pump casing 15 at a position where the positions of the sealing piece 15d and the groove 19b can be matched to form the suction passage 19, and the upper pump casing is fastened by the fastening means 23. 15 and the lower casing 16 are joined together.

  Further, in order to assemble the cooling device, the centrifugal pump 3 is mounted with the heat generating electronic component 4 (an object to be cooled) in contact with the outer surface of the lower casing 16, and the heat of the heat generating electronic component 4 is transmitted to the lower casing 16. Heat is exchanged with the refrigerant liquid in the pump chamber 15a. The refrigerant whose temperature has increased due to the heat exchange is discharged from the centrifugal pump 3 by the rotation of the impeller 11, and is radiated by the radiator 6, and the refrigerant liquid whose temperature has decreased is sucked into the pump again.

  By the way, in the present invention, the lower casing 16 is made of a metal material having high thermal conductivity and good heat dissipation, and the upper pump casing 15 is integrally formed of a resin such as polyphenylene sulfide (PPS) or polyphenylene ether (PPE). Features. Copper is optimal as the metal material, and polyphenylene sulfide is preferable as the resin material from the viewpoint of strength and heat resistance. If only considering heat dissipation by heat transfer, it is more advantageous in terms of heat transfer to make the entire casing made of metal, but the present invention employs a combination of resin and metal if the only metal is eddy current due to rotation of the magnet rotor 13. This is because the motor efficiency deteriorates.

  That is, the magnet rotor 13 is rotated by a rotating magnetic field generated by the stator 14, and the magnetic flux of the magnet rotor 13 changes with time in the pump casing. An eddy current flows in a direction that prevents this change in magnetic flux, and eddy current loss occurs. In particular, Example 1 uses copper and is reduced in size and thickness so that the motor efficiency is significantly reduced. However, in the present invention, the upper pump casing 15 employs a resin to prevent the motor efficiency from being reduced. It is possible to prevent a decrease in heat dissipation amount and heat dissipation efficiency due to a decrease in motor efficiency.

  In the present invention, since the upper pump casing 15 is made of resin and the lower casing 16 is made of metal, a difference in thermal expansion occurs when heat is transferred. In general, since the thermal expansion coefficient of metal is larger than that of resin, when the fitting portion 15c is not provided, the force due to thermal expansion concentrates on the fastening means 23, the coupled state is loosened, and the sealing performance is deteriorated. . However, in Example 1, since the fitting part 15c is provided in the side of the cylindrical thick part 16a in the upper pump casing 15, when the temperature rises, the fitting part 15c becomes the cylindrical thick part 16a. Receiving force, it is in close contact with the fastening means 23, and no excessive force is directly applied to the fastening means 23, so that the refrigerant does not leak. The time when this temperature rises is when the seal is most needed during operation of the centrifugal pump 3. Further, since the fitting portion 15c receives the thermal expansion force almost uniformly in the height direction on the cylindrical inner surface, the fastening means 23 is loosened, and an air layer is formed between the contact surface 16b and the heat generating electronic component 4. The heat transfer area is not reduced and heat transfer is not hindered.

Furthermore, making the upper pump casing 15 made of resin is extremely effective in manufacturing. The upper pump casing 15 has a complicated shape due to the presence of the pump chamber 15a and the stator 14, so it is difficult to process the pump casing with metal, but it is easy to manufacture by using the upper pump casing 15 which is difficult to process as a resin. become. Furthermore, since the centrifugal pump 3 sucks the refrigerant from the lower side of the pump chamber 15a, the suction passage 19 must be formed to protrude toward the lower casing 16, and the joint portion must be processed at the same time. Becomes difficult. However, in the first embodiment, the suction path 19 includes the groove 19b and the sealing portion 15d, so that the upper pump casing 15 and the lower casing 16 can be integrally formed. Further, the processing can be made extremely easy by providing the upper pump casing 15 in the holding portion and inserting the sealing cylindrical tube 25 to form the suction passage 19. In order to make it small and thin, the shape of the suction passage 19 and the pump chamber 15a must be precisely processed. However, because of the resin, it can be easily and precisely integrally formed. Since the pump casing can be configured only by the combination of the two members of the upper pump casing 15 and the lower casing 16, the pump configuration becomes simple and the assembly is easy. As described above, in some cases, it is appropriate to further divide into several pieces.

  As described above, in the centrifugal pump of the first embodiment, the lower casing is made of a metal material having high thermal conductivity and good heat dissipation, and the upper pump casing is integrally formed of resin, which may cause eddy current loss. In addition, a reduction in motor efficiency can be prevented. Thereby, the amount of heat radiation does not decrease and the heat radiation efficiency does not decrease. Sealing performance is not lowered by loosening of the fastening means due to thermal expansion or deformation of the lower casing, or an air layer is formed between the contacting surfaces, and the heat transfer area is reduced, so that heat transfer is not hindered. Since the pump casing is made of resin, it can be molded integrally and manufacturing becomes easy. By molding integrally with resin, it is possible to easily mold complicated shapes including the surrounding flow path configuration, and it is possible to reduce the size and thickness of the pump while improving cooling efficiency and motor efficiency it can. Since the pump casing can be configured simply by fitting the two members of the upper pump casing and the lower casing, the pump configuration is simplified and assembly is easy.

  INDUSTRIAL APPLICABILITY The present invention can be applied to a cooling device for an electronic device that cools a heat generating electronic component such as a CPU disposed inside a casing by circulating a refrigerant.

The perspective view of the electronic device which provided the cooling device of Example 1 of this invention Sectional drawing of the centrifugal pump of the cooling device of Example 1 of this invention (A) Front view of lower casing of centrifugal pump of embodiment 1 of the present invention, (b) Cross-sectional view of lower casing of (a), (c) Side view of lower casing of (a) (A) Sectional drawing of the centrifugal pump which mounted | wore with the sealing member of Example 1 of this invention, (b) Front view of the sealing member of (a) Sectional drawing of the centrifugal pump comprised with the 3 piece pump casing of Example 1 of this invention Configuration diagram of conventional electronic equipment cooling device

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Case 2 Keyboard 3 Centrifugal pump 4 Heating electronic component 5 Board | substrate 6 Radiator 7 Circulation path 11 Impeller 12 Open blade 13 Magnet rotor 14 Stator 15 Upper pump casing 15a Pump chamber 15b Step part 15c Fitting part 15d, 25a Sealing Piece 15e Holding part 16 Lower casing 16a Cylindrical thick part 16b Contact surface 17 Fixed shaft 18 Bearing 19 Suction passage 19a Water inlet 19b Groove 20 Control board 21 Shaft support part 22 Gutter part 22a Fastening hole 23 Fastening means 24 Seal member 25 Seal Cylinder pipe 26 Fitting casing part 27 Second upper pump casing

Claims (9)

A heat exchanger and a contact heat exchange type centrifugal pump are provided in a closed circuit for circulating the refrigerant, and the centrifugal pump is brought into contact with the heat generating electronic component, and heat is exchanged from the heat generating electronic component by the heat exchange action of the internal refrigerant. A cooling device that radiates heat from the radiator,
The pump chamber of the centrifugal pump is constructed by fitting the first casing and the second casing comprises a contact surface for contacting the heat-generating electronic component while being formed in the first casing gold metal material, The cooling device is characterized in that the second casing is formed of resin. It is integrally formed including a part of the suction passage in the first casing gold metal material, and the second casing are formed integrally, including the rest of the suction passage and the discharge port portion by resin The cooling device according to claim 1. Grooves constitute one aspect of the suction passage as a part of the suction passage is formed integrally with a metallic material, other portions of the suction passage to a water seal between the suction passage and the pumping chamber closes the groove The cooling device according to claim 2, wherein the cooling device is a combination sealing portion. The combined sealing portion, the cooling device according to claim 3, wherein the a sealing piece and the pumping chamber closes the groove provided separating the suction passage to the second casing. The cooling device according to claim 3, wherein the combined sealing portion is a holding portion provided in the second casing to which a separate sealing member for closing the groove can be mounted. The first casing is provided with a cylindrical thick part for forming one side surface of the pump chamber and a flange for coupling the casing, and the cylindrical thick part is fitted into the second casing. A fitting portion is provided, the cylindrical thick portion is inserted into the fitting portion, and the flange portion is fixed to the fitting portion by fastening means. The cooling device according to 1. The cooling device according to any one of claims 1 to 6, wherein a stepped portion that is positioned in contact with the cylindrical thick portion is provided in the fitting portion. The cooling apparatus according to any one of claims 1 to 7, wherein the first casing or the second casing is divided into a plurality of pieces. A heat exchanger and a contact heat exchange type centrifugal pump are provided in a closed circuit for circulating the refrigerant, and the centrifugal pump is brought into contact with the heat generating electronic component, and heat is exchanged from the heat generating electronic component by the heat exchange action of the internal refrigerant. A cooling device that radiates heat from the radiator,
The centrifugal pump, the with the pump chamber for housing the pump impeller first casing, is constituted by fitting the second casing and the third casing, it is formed by the first casing gold metal material A contact surface for contacting the heat-generating electronic component, wherein the second casing is formed of a resin material including a joint portion of the suction path and the discharge path, and the third casing covers the back side of the pump impeller and A cooling device that is fitted with the second casing and formed of a resin material.

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