JP2005315159A - Pump and electronic equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pump capable of excellently cooling a heating element over a long period. <P>SOLUTION: A pump housing 101 has a heat receiving plate 122 thermally connected to a CPU 31, and a pump room 118 for storing a liquid refrigerant. A rotary body 102 is arranged in the pump room 118. The rotary body 102 has an agitating part 107 for agitating the liquid refrigerant in the pump room 118 on an under surface 108a opposed to the heat receiving plate 122. A motor 103 for rotating the rotary body 102 has a stator 103b, and a rotor magnet 103a covered with the rotary body 102. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a pump provided in a liquid cooling type cooling device that cools a heating element such as a CPU using a liquid refrigerant, and an electronic device including the pump.

  As a pump, there is known a pump provided with a disk-shaped impeller having a concave portion on one end face and a plurality of blades on the other end face. This impeller has a magnetic field generator on the inner periphery of the recess. The magnetic field generator is formed by fixing a ring-shaped member made of a permanent magnet in a recess of an impeller formed of resin. The magnetic field generator is formed by forming an impeller with a plastic magnet and magnetizing a portion corresponding to the magnetic field generator (see, for example, Patent Document 1).

As a pump, a pump including a stator having a plurality of coils and a motor having a permanent magnet rotor is known. The stator is molded with resin to constitute a molded stator. The rotor is resin molded to constitute a cylindrical mold rotor. A vane constituting an impeller (impeller) projects from the outer periphery of the mold rotor (see, for example, Patent Document 2).
JP 2003-343492 A (paragraph 0025, FIG. 2) JP-A-11-166500 (paragraph 0048, FIG. 23)

  Incidentally, CPUs (Central Processing Units) used in electronic devices tend to increase the amount of heat generated during operation as the processing speed increases and the number of functions increases. In recent years, electronic devices equipped with a so-called liquid cooling type cooling device that cools the CPU using a liquid refrigerant having a specific heat far higher than that of air have been put into practical use as a countermeasure against this heat. In such a cooling device, there is a demand for a pump that can cool the heating element satisfactorily for a long period of time with stable pump performance.

  In order to obtain stable performance as a pump, it is preferable to configure the pump so that a rotating body such as an impeller is rotated by a motor having a rotor magnet composed of a stator and a permanent magnet. However, as described in Patent Document 1, in a pump in which a ring-shaped member (rotor magnet) made of a permanent magnet is fixed to a recess of an impeller formed of resin, the rotor magnet is exposed to a liquid refrigerant in the pump chamber. It will be in the state. Therefore, the pump configured as described above has a problem that the rotor magnet is easily corroded by the liquid refrigerant. If the rotor magnet is corroded by the liquid refrigerant, the performance of the motor may be reduced, or the liquid refrigerant may be contaminated and the cooling effect as the refrigerant may be reduced.

  In addition, the pump described in Patent Document 2 is difficult to reduce in size because the stator is molded with resin, and the vanes that constitute the impeller project from the outer periphery of the cylindrical mold rotor. Therefore, it is difficult to mount the pump configured in this manner on an electronic device in which various components are arranged relatively densely.

  The present invention has been made based on such circumstances, and an object of the present invention is to provide a pump that can cool a heating element well for a long period of time, and an electronic apparatus including the pump.

  The pump according to the first aspect of the present invention includes a housing having a heat receiving portion and a pump chamber thermally connected to the heating element, a stator, a surface provided in the pump chamber and facing the heat receiving portion, And a rotating body having a stirrer for stirring the fluid in the pump chamber on at least one surface opposite to the surface facing the heat receiving portion, and having a rotor magnet facing the stator inside. It has.

An electronic device according to a second aspect of the present invention is
A housing having a heating element;
A heat dissipating part, a circulation path thermally connected to the heat dissipating part, and a pump having a heat receiving part thermally forcibly circulating the refrigerant in the circulation path and thermally connected to the heating element. A cooling device,
The above pump
A housing having the heat receiving portion;
A pump room,
A stator,
At least one of a surface facing the heat receiving portion and a surface opposite to the surface facing the heat receiving portion has a stirring portion for stirring the fluid in the pump chamber, and a rotor facing the stator inside. A rotating body having a magnet and sending the refrigerant to the circulation path;
And a pump chamber that houses the rotating body.

  ADVANTAGE OF THE INVENTION According to this invention, the pump and electronic device which can cool a heat generating body favorably for a long period are obtained.

A first embodiment of the present invention will be described below with reference to FIGS.
1 and 2 disclose a portable computer 1 as an electronic apparatus. The portable computer 1 includes a computer main body 2 and a display unit 3. The computer main body 2 includes a flat box-shaped first housing 10. The first housing 10 includes a bottom wall 11a, an upper wall 11b, a front wall 11c, left and right side walls 11d and 11e, and a rear wall 11f.

  As shown in FIG. 1, the upper wall 11 b has a palm rest 12 and a keyboard mounting portion 13. The keyboard attachment portion 13 is provided behind the palm rest 12. The keyboard 14 is attached to the keyboard attachment portion 13. The front wall 11 c, the left and right side walls 11 d and 11 e, and the rear wall 11 f constitute a peripheral wall along the circumferential direction of the first housing 10. As shown in FIG. 2, a plurality of exhaust ports 15 are formed in the peripheral wall of the first housing 10, for example, the rear wall 11 f. These exhaust ports 15 are arranged in a line in the width direction of the first housing 10.

  As shown in FIG. 1, the display unit 3 includes a flat box-shaped second casing 20 and a liquid crystal display panel 21 as a display panel. The liquid crystal display panel 21 is accommodated in the second housing 20. The liquid crystal display panel 21 has a screen 21a for displaying an image. The screen 21 a of the liquid crystal display panel 21 is exposed to the outside of the second housing 20 through an opening 22 formed on the front surface of the second housing 20.

  The second housing 20 is supported on the rear end portion of the first housing 10 via a hinge (not shown). Therefore, the display unit 3 is rotatable between a closed position where the palm rest 12 and the keyboard 14 are tilted so as to cover the palm rest 12 and the keyboard 14 and an open position where the palm rest 12, the keyboard 14 and the screen 21a are exposed. Yes.

  As shown in FIG. 3, a printed circuit board 30 is accommodated in the first housing 10. As shown in FIG. 7, the printed circuit board 30 is disposed in parallel with the bottom wall 11 a of the first housing 10. A CPU 31 as a heating element is mounted on the upper surface of the printed circuit board 30. The CPU 31 constitutes a microprocessor serving as the center of the portable computer 1.

  The CPU 31 has a base substrate 32 and a planar square IC chip 33 disposed in the center of the upper surface of the base substrate 32. The IC chip 33 generates a large amount of heat during operation as the processing speed increases and the number of functions increases, and cooling is necessary to maintain a stable operation.

  As shown in FIG. 3, the portable computer 1 is equipped with a liquid cooling type cooling device 40 that cools the CPU 31 using a liquid refrigerant such as antifreeze. The cooling device 40 is accommodated in the first housing 10. The cooling device 40 includes a pump 100 that also serves as a heat receiving unit and a heat exchanger, a heat radiating unit 50, a circulation path 60, an electric fan 70, and the like.

  As shown in FIGS. 4, 5, and 7, the pump 100 forcibly circulates the liquid refrigerant in the circulation path 60, and includes a pump housing 101 that also serves as a heat receiving unit, a rotating body 102, a rotor magnet 103 a, A motor 103 having a stator 103b and a control board 104 are provided.

  The pump housing 101 includes a housing main body 110, a first cover 111, and a second cover 112. The housing main body 110 has a flat box shape that is slightly larger than the CPU 31 and has a concave portion 113 opened upward.

  The housing main body 110 includes a frame-shaped main body portion 121 and a heat receiving plate 122 as a heat receiving portion that liquid-tightly closes the open end opened downward of the main body portion 121. That is, the recess 113 is defined by the inner surface of the main body main part 121 and the upper surface of the heat receiving plate 122. The heat receiving plate 122 that also serves as the bottom wall of the recess 113 faces the CPU 31. The lower surface of the heat receiving plate 122 is a flat heat receiving surface 122a. The heat receiving plate 122 is preferably formed of a metal material having high thermal conductivity such as copper, aluminum, or aluminum alloy. An O-ring 123 is provided between the main body 121 and the heat receiving plate 122. The housing body 110 may be an integral structure.

  The first cover 111 made of resin closes the opening end of the recess 113 in a liquid-tight manner. An O-ring 124 is provided between the housing body 110 and the first cover 111. The upper surface of the first cover 111 has a stator housing recess 115 for housing the stator 103 b and a control board housing recess 116 for housing the control board 104.

  The inside of the pump housing 101, that is, the region surrounded by the recess 113 and the first cover 111, is partitioned by a ring-shaped partition wall 117 into a pump chamber 118 and a reserve tank 119 that stores liquid refrigerant. The partition wall 117 is formed integrally with the housing main body 110 (main body main part 121 in this embodiment). The pump chamber 118 is provided close to one of the four corners of the pump housing 101. That is, the center position of the pump chamber 118 is eccentric with respect to the center position of the pump housing 101. The reserve tank 119 is provided so as to surround the pump chamber 118 from the remaining three corners of the four corners of the pump housing 101. The partition wall 117 is formed with a communication port 130 that allows the pump chamber 118 and the reserve tank 119 to communicate with each other.

  The housing main body 110 (main body main part 121 in this embodiment) is provided with a suction pipe 131 and a discharge pipe 132. The suction pipe 131 and the discharge pipe 132 are arranged horizontally with a space between each other. The upstream end of the suction pipe 131 protrudes outward through the side wall of the housing main body 110 (main body main part 121 in this embodiment). The downstream end of the suction pipe 131 opens into the reserve tank 119 and faces the communication port 130 of the partition wall 117.

  The downstream end of the discharge pipe 132 protrudes outward through the side wall of the housing main body 110 (main body main part 121 in this embodiment) and is aligned with the upstream end of the suction pipe 131. The upstream end of the discharge pipe 132 passes through the partition wall 117 and opens into the pump chamber 118.

  As best shown in FIG. 7, the resin-made rotating body 102 is integrated with the rotating body main portion 102b so as to penetrate the disc-shaped rotating body main portion 102b and the center of the rotating body main portion 102b. And a rotating shaft 102a formed on the surface. The rotating body main part 102b has a surface (hereinafter, this surface is referred to as a lower surface) 108a facing the heat receiving plate 122 and a surface (hereinafter, this surface is referred to as an upper surface) 108b opposite to the lower surface 108a. Yes. The rotating body 102 is accommodated in the pump chamber 118 in such a posture that the axis of the rotating shaft 102a intersects the heat receiving plate 122, for example, is orthogonal thereto. The rotating body 102 is rotatably supported by the first cover 111 and the heat receiving plate 122 in a state where the rotating shaft 102a is disposed so as to straddle between the first cover 111 and the heat receiving plate 122. Yes.

  The motor 103 is for rotating the rotating body 102, and has a rotor magnet 103a and a stator 103b. The rotor magnet 103a is made of, for example, a ring-shaped permanent magnet in which a plurality of positive electrodes and a plurality of negative electrodes are magnetized with each other. The rotor magnet 103 a is fixed to the rotating body 102 so as to be coaxial with the rotating body 102 and is accommodated in the pump chamber 118. The rotor magnet 103a is covered with the rotating body 102 at least in a region facing the pump chamber 118 on the outer surface so that the rotor magnet 103a does not come into contact with the liquid refrigerant in the pump chamber 118. In the present embodiment, the entire area of the outer surface of the rotor magnet 103 a is covered with the rotating body 102.

  Specifically, the rotor magnet 103a is covered by a part of the rotating body 102 in a state of being arranged along the periphery of the upper surface 108b of the rotating body main portion 102b and projecting upward. The rotating body 102 is formed, for example, by molding the rotor magnet 103a as an insert.

  In other words, the rotating body main part 102b has an overhanging part 109 provided on the upper surface 108b along the peripheral edge thereof and projecting in a direction (upward) opposite to the direction (downward) of the heat receiving plate 122. Yes. The rotor magnet 103 a is provided in the overhang portion 109. In the present embodiment, the rotor magnet 103a has a vertically long rectangular cross-sectional shape in which the length of the rotating body 102 in the direction orthogonal to the rotating shaft 102a is shorter than the length in the direction parallel to the rotating shaft 102a. (See FIG. 7).

  The rotating body 102 has an agitation unit 107 for agitating the liquid refrigerant in the pump chamber 118 on at least one of the lower surface 108a and the upper surface 108b of the rotating body main portion 102b. When the stirring unit 107 is provided on the lower surface 108 a of the rotating body 102, the liquid refrigerant can be flowed well in the vicinity of the heat receiving plate 122. Therefore, when the stirring unit 107 is provided on the lower surface 108a of the rotating body 102, the cooling effect of the CPU 31 can be enhanced. In addition, when the stirring unit 107 is provided on the upper surface 108b of the rotating body 102, the pump efficiency of the pump 100 can be increased.

  As pump 100 with which cooling device 40 is provided, a pump with high cooling efficiency is preferred. In such a case, the stirring unit 107 may be provided on at least the lower surface of the rotating body 102. The portable computer 1 is generally required to be thin. Therefore, when mounted on an electronic device such as the portable computer 1, the pump 100 is preferably as thin as possible. In such a case, the stirring unit 107 may be provided only on the lower surface of the rotating body 102. By doing in this way, the pump 100 can be made thin compared with the case where the stirring part 107 is provided in both surfaces (upper surface and lower surface) of the rotary body 102. FIG.

  In the present embodiment, as shown in FIGS. 4 and 7, as the rotating body 102, an impeller in which a stirring unit 107 having a plurality of blades 105 is provided on the lower surface of the rotating body main portion 102 b is employed.

  As the rotating body 102, a rotating body as shown in FIG. 6, that is, a structure in which the stirring unit 107 is provided on the upper surface and the lower surface of the rotating body main portion 102b may be adopted. When the stirring unit 107 is provided on the upper surface 108b of the rotating body 102, the stirring unit 107 is preferably provided on the front end surface of the overhanging portion 109 as shown in FIG. You may provide in area | regions other than.

  The rotating body 102 only needs to be able to stir a fluid such as a liquid refrigerant in the pump chamber 118 and send the fluid out of the pump chamber 118 to the outside of the pump chamber 118. Therefore, the rotating body 102 is not limited to the one provided with the stirring unit 107 having the blades 105 (so-called impeller). The rotating body 102 may include, for example, a stirring unit 107 having a plurality of recesses 106 (see FIG. 6). Even when such a rotating body 102 is employed, the fluid in the pump chamber 118 can be agitated and the fluid can be sent out of the pump chamber 118 to the outside of the pump chamber 118. Further, the rotating body 102 may be, for example, one provided with a stirring unit 107 having a spirally formed groove.

  The stator 103 b constituting the motor 103 is housed in a stator housing recess 115 formed on the upper surface of the first cover 111. Incidentally, the stator 103b needs to be provided so as to correspond to the rotor magnet 103a via the first cover 111. Therefore, the stator accommodating recess 115 is provided at a position corresponding to the rotor magnet 103a. That is, the center position of the stator housing recess 115 is eccentric with respect to the center position of the first cover 111. The control board housing recess 116 is provided at a position avoiding the stator housing recess 115.

  Further, by closing the opening end of the recess 13 with the first cover 111, the stator accommodating recess 115 is formed so as to enter the rotor magnet 103a. That is, the stator 103b is accommodated coaxially inside the rotor magnet 103a via the first cover 111. The stator 103b is electrically connected to the control board 104.

  Energization of the stator 103b is performed at the same time when the portable computer 1 is turned on, for example. By this energization, a rotating magnetic field is generated in the circumferential direction of the stator 103b, and this magnetic field and the rotor magnet 103a are magnetically coupled. As a result, a rotational torque along the circumferential direction of the rotating body 102 is generated between the stator 103b and the rotor magnet 103a, and the rotating body 102 rotates.

  A second cover 112 is fixed to the upper surface of the first cover 111. The second cover 112 covers and hides the stator 103b and the control board 104. The second cover 112 is a cover for suppressing leakage and evaporation of the liquid refrigerant, and is formed of a metal material such as an aluminum alloy. Note that the second cover 112 may be omitted.

  The pump 100 having such a configuration is placed on the printed circuit board 30 so as to cover the CPU 31 from above. As shown in FIG. 7, the pump housing 101 of the pump 100 is fixed to the bottom wall 11 a of the first housing 10 together with the printed circuit board 30. The bottom wall 11 a has boss portions 17 at positions corresponding to the four corners of the pump housing 101. The boss portion 17 protrudes upward from the bottom wall 11a. A printed circuit board 30 is superimposed on the front end surfaces of these boss portions 17. 7 denotes a reinforcing plate that reinforces the printed circuit board 30 from the lower surface.

  The pump 100 is attached to the bottom wall 11a of the first housing 10 so as to cover the CPU 31 from above by an attachment mechanism as described below. Concave portions 141 are provided at four corners of the pump housing 101. The bottom wall (corner portion of the heat receiving plate 122) that defines the recess 141 has a through hole 142 through which the cylindrical insert 143 passes. The insert 143 has an overhanging portion 143a that protrudes outward in the horizontal direction along the circumferential direction at the upper end. Moreover, the insert 143 has the groove part 143b along the circumferential direction.

  The pump 100 is pressed against the CPU 31 by this attachment mechanism as follows. First, the insert 143 is passed through the coil spring 144. The insert 143 is inserted from the open end of the first cover 111 that is open upward, and the groove 143b is positioned below the heat receiving surface 122a of the pump 100. A retaining C ring 145 is fitted into the groove 143b. Thereby, the insert 143 is attached to the pump 100 in a state where the protruding portion 143a is urged by the coil spring 144 in a direction away from the bottom wall that defines the recess 141.

  Conductive grease (not shown) is applied to either the upper surface of the IC chip 33 or the region corresponding to the IC chip 33 of the heat receiving surface 122a, and the heat receiving surface 122a of the pump housing 101 is opposed to the IC chip 33. A screw 146 penetrating through the insert 143 is screwed into the boss portion 17 on the printed circuit board 30. As a result, the insert 143 is fixed to the boss portion 17 and the pump 100 is pressed against the IC chip 33 by the elasticity of the coil spring 146. Thereby, the IC chip 33 is thermally connected to the heat receiving surface 122a of the pump housing 101 via the conductive grease.

  In this portable computer 1, the pump 100 is fixed on the printed circuit board 30 so that the center of the pump housing 101 (center of the heat receiving surface 122 a) coincides with the center of the IC chip 33. On the other hand, the center (rotating shaft 102 a) of the rotating body 102 is eccentric from the center of the pump housing 101. Therefore, the center of the IC chip 33 is decentered from the center of the rotating body 102 facing each other with the pump housing 101 interposed therebetween. By doing so, more heat of the IC chip 33 can be absorbed by the liquid refrigerant. That is, in order to absorb more heat of the IC chip 33 in the liquid refrigerant, the IC chip 33 is preferably opposed to a position where the flow of the liquid refrigerant is fast across the pump housing 101. As is known, the flow of the liquid refrigerant generated by the rotation of the rotor magnet 103a becomes faster as the distance from the center of the rotating body 102 increases. Therefore, with the configuration described above, more heat of the IC chip 33 can be absorbed by the liquid refrigerant.

  As shown in FIG. 3, the heat radiating portion 50 includes a heat radiating portion main body 51 and a plurality of heat radiating fins 57 thermally connected to the heat radiating portion main body 51. The heat dissipating part main body 51 is configured by a substantially U-shaped pipe through which a liquid refrigerant flows. The heat dissipating part main body 51 has a refrigerant inlet 54 and a refrigerant outlet (not shown, provided on the back side of the surface of the refrigerant inlet in FIG. 3), and is configured so that the refrigerant circulates therein. . That is, one open end of the substantially U-shaped pipe is a refrigerant inlet 54 and the other open end is a refrigerant outlet. That is, the pipe (heat radiating part main body 51) of the heat radiating part 50 forms a part of the circulation path 60 (the circulation path 60 will be described in detail later).

  The heat dissipating part main body 51 is accommodated in the first housing 10 in a posture (rotated posture) in which a substantially U-shaped pipe is rotated 90 ° so that the refrigerant inlet 54 is at the top and the refrigerant outlet is at the bottom. Has been. The heat radiating fins 57 are formed of a metal material having excellent thermal conductivity, such as an aluminum alloy or copper. The radiating fins 57 are formed in a square plate shape. The heat radiating fins 57 are arranged in parallel with a space therebetween. Each radiating fin 57 is soldered to the radiating portion main body 51.

  The heat radiating unit 50 is accommodated in the first housing 10 in a posture in which the heat radiating fins 57 are opposed to the exhaust port 15 of the first housing 10. In addition, a pair of brackets 58 are soldered to the heat radiating portion 50. These brackets 58 are screwed to bosses (not shown) protruding from the bottom wall 11 a of the first housing 10. By doing in this way, the thermal radiation part 50 is being fixed to the bottom wall 11a of the 1st housing | casing 10. FIG.

  The circulation path 60 includes a first pipe 61, a second pipe 62, and a pipe (heat radiating part main body 51) included in the heat radiating part 50. That is, the heat dissipating part main body 51 serves as both the heat dissipating part 50 and the circulation path 60. The first pipe 61 connects the discharge pipe 132 of the pump 100 and the refrigerant inlet 54 of the heat radiating unit 50. The second pipe 62 connects the suction pipe 131 of the pump 100 and the refrigerant outlet of the heat radiating unit 50. For this reason, the liquid refrigerant circulates between the pump 100 and the heat radiating unit 50 through the first pipe 61 and the second pipe 62.

  The electric fan 70 is for blowing cooling air to the heat radiating unit 50, and is disposed immediately before the heat radiating unit 50. The electric fan 70 includes a fan casing 71 and a centrifugal impeller 72 housed in the fan casing 71. The fan casing 71 has a discharge port 71a for discharging cooling air. The discharge port 71 a is connected to the heat radiating unit 50 through the duct 73.

  The impeller 72 is driven to rotate by a motor (not shown) when the portable computer 1 is turned on or when the temperature of the CPU 31 reaches a predetermined temperature. Thereby, the cooling air is supplied from the discharge port 71 a of the fan casing 71 toward the heat radiating unit 50.

  Next, the operation of the cooling device 40 will be described.

  While the portable computer 1 is in use, the IC chip 33 of the CPU 31 generates heat. The heat generated by the IC chip 33 is transmitted to the pump housing 101 via the heat receiving surface 122 a of the pump 100. Since the recess 113 (the pump chamber 118 and the reserve tank 119) of the pump housing 101 is filled with the liquid refrigerant, the liquid refrigerant absorbs most of the heat transferred to the pump housing 101.

  Energization of the stator 103b of the motor 103 is performed simultaneously with the power-on of the portable computer 1. Thereby, rotational torque is generated between the stator 103b and the rotor magnet 103a, and the rotor magnet 103a rotates with the rotating body 102. When the rotating body 102 rotates, the liquid refrigerant in the pump chamber 118 is pressurized and discharged from the discharge pipe 132, and is guided from the refrigerant inlet 54 into the heat radiating unit 50 through the first pipe 61. The liquid refrigerant heated by heat exchange in the pump housing 101 circulates in the heat radiating section 50 from the refrigerant inlet 54 side toward the refrigerant outlet side, and in this process, the heat of the IC chip 33 absorbed by the liquid refrigerant is dissipated. It is transmitted to the fin 57.

  When the impeller 72 of the electric fan 70 rotates during use of the portable computer 1, cooling air blows out from the discharge port 71 a of the fan casing 71 toward the heat radiating unit 50. This cooling air passes through between the radiation fins 57 adjacent to each other. As a result, the radiating fins 57 and the radiating unit main body 51 are cooled, and most of the heat transferred to the radiating fins 57 and the radiating unit main body 51 is multiplied by the flow of the cooling air, and the first casing 10 is discharged from the exhaust port 15. Released to the outside.

  The liquid refrigerant cooled by the heat radiating unit 50 is guided to the suction pipe 131 of the pump housing 101 via the second pipe 62. The liquid refrigerant is returned to the reserve tank 119 from the suction pipe 131. The liquid refrigerant returned to the reserve tank 119 again absorbs the heat of the IC chip 33 while being sucked into the pump chamber 118. By repeating such a cycle, the heat of the IC chip 33 is sequentially transferred to the heat radiating unit 50, and is discharged outside the first housing 10 by multiplying the flow of cooling air passing through the heat radiating unit 50.

  As described above, the pump 100 according to this embodiment includes the heat receiving plate 122 that is thermally connected to a heating element such as the CPU 31 and the pump housing 101 that includes the pump chamber 118 that stores the liquid refrigerant. That is, the pump 100 has a function of a heat receiving part and a function of a heat exchanger. Therefore, the pump 100 can be suitably used for the cooling device 40 as described above that is mounted on the portable computer 1.

  Further, in the pump 100, at least a region facing the pump chamber 118 of the rotor magnet 103 a is covered with the rotating body 102. Specifically, the resin rotating body 102 is formed by being molded so as to cover the rotor magnet 103a. Therefore, the rotor magnet 103a does not contact the liquid refrigerant in the pump chamber 118. Therefore, the rotor magnet 103a can be prevented from being corroded by the liquid refrigerant. In addition, this makes it possible to suppress a decrease in the performance of the motor 103 caused by the rotor magnet 103a being corroded by the liquid refrigerant and a cooling effect caused by the contamination of the liquid refrigerant. Therefore, according to the pump 100, a heating element such as the CPU 31 can be cooled well for a long time.

  In addition, the pump 100 includes a rotating body 102 having a stirring unit 107 that stirs the liquid refrigerant in the pump chamber 118 on one of the lower surface 108a and the upper surface 108b. Therefore, the pump 100 can be formed thinner than a pump including an impeller having blades provided on the peripheral surface.

  Further, in the pump 100, the stirring unit 107 that stirs the liquid refrigerant in the pump chamber 118 is provided only on the lower surface 108a of the rotating body 102. For this reason, the pump 100 can efficiently cool a heating element such as the CPU 31, and can be formed thinner than the case where the stirring unit 107 is provided on the lower surface 108a and the upper surface 108b of the rotating body 102. it can.

  Further, in the pump 100, the upper surface 108b of the rotating body main portion 102b of the rotating body 102 has a projecting portion 109 that is provided along the peripheral edge and projects upward. The rotor magnet 103a is provided in the overhanging portion 109. Therefore, by arranging the stator 103b inside the overhanging portion 109, the motor 103 can be easily configured by the rotor magnet 103a and the stator 103b. Therefore, even if the rotor magnet 103a is provided in the rotating body 102, the rotating body 102 can be rotated satisfactorily.

  Further, according to the portable computer 1 of the present embodiment, the liquid refrigerant is discharged between the heat radiating part 50 that releases the heat of the CPU 31, the pump 100 that sends the refrigerant to the heat radiating part 50, and the pump 100 and the heat radiating part 50. A circulation path 60 that circulates and transfers the heat of the CPU to the heat radiating unit 50 via the liquid refrigerant is provided. Therefore, according to the portable computer 1 of the present embodiment, the CPU 31 can be cooled well for a long time.

Hereinafter, a second embodiment of the present invention will be described with reference to FIG.
The pump 100 included in the portable computer 1 of the present embodiment is different from the pump 100 of the first embodiment in the cross-sectional shape of the rotor magnet 103a. That is, in the present embodiment, the rotor magnet 103a is formed such that the cross-sectional shape thereof is a flat rectangular shape whose length in the direction orthogonal to the rotation shaft 102a is longer than the length in the direction parallel to the rotation shaft 102a. ing. Since other configurations are the same as those in the first embodiment described above, including the portions not shown in the drawings, overlapping descriptions will be omitted by attaching the same reference numerals to the drawings.

  In the pump 100 of this embodiment, the rotor magnet 103a is formed so that the length in the direction orthogonal to the rotation shaft 102a has a flat rectangular cross-sectional shape longer than the length in the direction parallel to the rotation shaft 102a. Yes. By doing so, the protruding height of the protruding portion 109 of the rotating body 102 can be lowered. Therefore, according to the pump 100 of the present embodiment, similarly to the pump 100 of the first embodiment, a heating element such as the CPU 31 can be cooled well for a long period of time, and the pump of the first embodiment. Compared with 100, it can be formed thinner.

  Further, according to the portable computer 1 of the present embodiment, similarly to the portable computer 1 of the first embodiment, a heating element such as the CPU 31 can be cooled well for a long period of time. Compared with the portable computer 1, the thickness can be reduced.

  In the pump 100 of the first and second embodiments, the stirring unit 107 is provided only on the lower surface 108a of the rotating body 102. However, the stirring unit 107 is provided on at least one of the lower surface 108a and the upper surface 108b of the rotating body 102. Just do it. That is, the stirring unit 107 may be provided only on the upper surface 108 b of the rotating body 102.

  The pump of the present invention can be widely used not only for electronic devices such as portable computers and cooling devices mounted on the electronic devices, but also for other devices. Furthermore, the electronic device of the present invention is not limited to a portable computer, and can be widely used in devices including a heating element and a cooling device for cooling the heating element.

1 is a perspective view showing a portable computer according to a first embodiment of the present invention. The perspective view which looked at the portable computer of FIG. 1 from the exhaust port side of the 1st housing | casing. The top view which shows the cooling device accommodated in the 1st housing | casing. The perspective view which decomposes | disassembles and shows a pump. The perspective view which shows a pump in the state which abbreviate | omitted the 2nd cover. The perspective view which shows an example of another rotary body which can be equipped with a pump. Sectional drawing shown along the VII-VII line in FIG. Sectional drawing which shows the positional relationship of the pump and CPU in the portable computer which concerns on the 2nd Embodiment of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Portable computer (electronic device), 10 ... 1st housing | casing (housing | casing), 31 ... CPU (heating element), 50 ... Radiating part, 60 ... Circulation path, 100 ... Pump, 101 ... Pump housing, 102 ... Rotating body, 102a ... rotating shaft, 102b ... stirring unit, 103 ... motor, 103a ... rotor magnet, 103b ... stator, 122 ... heat receiving plate (heat receiving unit), 118 ... pump chamber

Claims (7)

A housing having a heat receiving portion thermally connected to the heating element and a pump chamber;
A stator,
At least one of a surface provided in the pump chamber and facing the heat receiving portion and a surface opposite to the surface facing the heat receiving portion has a stirring portion for stirring the fluid in the pump chamber, A rotating body having a rotor magnet facing the stator,
A pump comprising: A housing having a heat receiving portion thermally connected to the heating element and a pump chamber;
A ring-shaped rotor magnet, and a motor having a stator provided inside the rotor magnet;
A resin-made rotating body that is provided in the pump chamber and has a stirring unit that stirs the fluid in the pump chamber on at least a surface facing the heat receiving unit, and is molded so as to cover the rotor magnet. Features a pump.   3. The pump according to claim 1, wherein the rotating body has a rotating shaft and is provided in the pump chamber in a posture in which an axis of the rotating shaft intersects the heat receiving portion. .   The rotating body has a rotating shaft, and the rotor magnet has a flat rectangular shape whose cross-sectional shape is longer in the direction perpendicular to the rotating shaft than in the direction parallel to the rotating shaft. The pump according to claim 1 or 2, wherein the pump is formed to have a shape.   The rotating body has a disk-shaped rotating body main portion, and the rotating body main portion is provided on the surface opposite to the surface facing the heat receiving portion along the periphery thereof, and 3. The pump according to claim 1, further comprising a projecting portion that projects in a direction opposite to the direction of the heat receiving unit, wherein the rotor magnet is provided in the projecting portion. A housing having a heating element;
A heat dissipating part, a circulation path thermally connected to the heat dissipating part, and a pump having a heat receiving part thermally forcibly circulating the refrigerant in the circulation path and thermally connected to the heating element are provided. A cooling device,
The above pump
A housing having the heat receiving portion;
A pump room,
A stator,
At least one of a surface facing the heat receiving portion and a surface opposite to the surface facing the heat receiving portion has a stirring portion for stirring the fluid in the pump chamber, and a rotor facing the stator inside. A rotating body having a magnet and sending the refrigerant to the circulation path;
An electronic device comprising: a pump chamber that houses the rotating body. A housing having a heating element;
Cooling provided with a heat radiating part, a circulation path thermally connected to the heat radiating part, and a pump having a heat receiving part thermally forcibly circulating the refrigerant in the circulation path and thermally connected to the heating element An apparatus,
The above pump
A housing having the heat receiving portion;
A pump room,
A ring-shaped rotor magnet, and a motor having a stator provided inside the rotor magnet;
An electronic apparatus comprising: a resin-made rotating body that has a stirring unit that stirs the fluid in the pump chamber at least on a surface facing the heat receiving unit, and is molded so as to cover the rotor magnet.

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