JP2005291084A - Pump, cooling device and electrical equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pump in which fluid does not escape from a casing or little.
SOLUTION: Portions 3b and 4b other than the surface portions 3a and 4a of the casing 2 of the pump 1 are formed of synthetic resin, and all or a part of the surface portions 3a and 4a are formed of metal so that fluid can be removed. Lost or reduced. Further, if the portion 17a of the casing 2 between the rotor magnet 16 and the stator 20 of the motor 24 is entirely made of metal, a large eddy current is generated by electromagnetic induction, which increases the motor loss. Since only the surface portion 4a of the casing 2 is made of metal, the generated eddy current is reduced and the loss of the motor can be reduced.
[Selection] Figure 1

Description

  The present invention relates to a pump having an improved casing, and a cooling device and electrical equipment using the pump.

Conventionally, as a pump, a disk-shaped impeller having a pump groove on the outer peripheral portion for carrying a fluid (for example, a liquid) is rotatably disposed in a pump chamber formed inside a casing having a suction port and a discharge port. It is known that a fluid is sucked into the pump chamber from the suction port and discharged from the discharge port by the pump groove by rotating the impeller.
Japanese Patent Laid-Open No. 2003-161284

  The conventional pump is used in a cooling device that cools a heat generating member such as an electrical component. In the cooling device, a cycle is constituted by the pump, the heat receiving portion, and the heat radiating portion, the fluid discharged from the pump is caused to flow through the cycle, and the heat of the heat generating member received by the heat receiving portion is taken away by the fluid, and The heat generating member is cooled by repeatedly releasing the heat taken away by the fluid at the heat radiating portion and then sucking the fluid into the pump.

  However, in the conventional pump, the casing is made of synthetic resin. This is mainly because the manufacturability is good and the weight is light, but the synthetic resin molded product is unavoidably escaped from the gas microscopically. For this reason, if the fluid is a gas, it escapes from the casing as it is, and even if it is a liquid, if it is heated to vaporize, the water vapor will escape from the casing, and the amount of fluid in the cycle will be insufficient. This will cause a decrease in cooling performance. Therefore, in actual use, maintenance for replenishing the fluid is necessary.

  SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and therefore the object thereof is to provide a pump in which there is little or no fluid escape from the casing, and at the same time, a cooling device and a pump that can efficiently obtain cooling performance It is an object of the present invention to provide an electric device that can cool a heat-generating member with no or little fluid escaping from the casing and further reducing motor loss.

  To achieve the above object, the pump of the present invention has a pump chamber inside, a casing having a suction port and a discharge port respectively communicating with the pump chamber, and a pump chamber rotatably disposed in the pump chamber. The impeller for sucking fluid from the suction port into the pump chamber by being rotated and discharging the fluid from the discharge port, the rotor magnet integrally provided on the impeller, and a part of the rotor magnet and the casing. And a motor having a stator provided so as to be opposed to each other. First, the entire surface portion of the casing, or a portion sandwiched between the stator and rotor magnet of the motor. A part of the surface part of the casing including the surface part is made of metal, and the other part is made of synthetic resin.

  In the pump of the present invention, secondly, the casing is formed by dividing the casing into a pump groove side and an anti-pump groove side of the impeller, the pump groove side casing is formed of metal, and the anti-pump groove side And a part of the surface portion including the entire surface portion of the casing sandwiched between the stator and rotor magnet of the motor, or the surface portion of the portion sandwiched between the stator and rotor magnet of the casing. A pump characterized in that the part is made of metal and the other parts are made of synthetic resin.

  In the cooling device of the present invention, the pump of the second configuration and a heat radiating part that radiates heat through the fluid discharged from the pump are provided, and the casing on the pump groove side of the pump is brought into contact with the heat generating member. Thus, the fluid passing through the pump takes away heat generated by the heat generating member through the casing on the pump groove side.

  Moreover, the electric device of the present invention includes a pump mainly composed of the first or second configuration, and a heat generating member that takes heat away from the fluid discharged from the pump, and heat taken from the heat generating member. It is characterized by having a heat radiating part which emits.

  According to the pump of the first configuration, the fluid is eliminated or reduced by the metal that forms all or part of the surface portion of the casing. Also, if the part of the casing that is sandwiched between the rotor magnet and stator of the motor is entirely made of metal, a large eddy current is generated by electromagnetic induction, resulting in a large motor loss. Since only the metal is metal, the eddy current generated is reduced and the loss of the motor can be reduced.

  According to the pump of the second configuration, the metal that forms the casing on the pump groove side and the metal that forms all or part of the surface portion of the casing on the anti-pump groove side eliminates fluid leakage, or Be reduced. Also, in this case, the entire surface portion of the casing on the side opposite to the pump groove and partly sandwiched between the stator and rotor magnet of the motor, or the portion of the casing sandwiched between the stator and rotor magnet. By forming a part of the surface portion including the surface portion with metal, the generated eddy current is reduced, and the loss of the motor can be reduced.

  According to the cooling device having the above configuration, the heat generated by the heat generating member can be directly given to the fluid carried in the pump groove of the impeller by the casing on the pump groove side formed of metal. Therefore, it is possible to efficiently obtain the cooling performance.

  According to the electrical equipment having the above configuration, by using the pump mainly composed of the first or second configuration, there is no or little fluid escaping from the pump casing, and furthermore, the loss of the motor is reduced, thereby generating heat. The member can be cooled.

Hereinafter, a first example (first embodiment) of the present invention will be described with reference to FIGS.
First, FIG. 1 is a cross-sectional view of the pump 1 in an assembled state, FIG. 2 is a perspective view of the pump 1 in an exploded state, and FIG. 3 is a perspective view of the pump 1 in an exploded state from the opposite side to FIG. Show.

  As shown in these drawings, the case casing 2 of the pump 1 is composed of a combination of a casing main body 3 and a casing lid body 4. The casing main body 3 and the casing lid body 4 are both rectangular, and portions 3b and 4b other than the surface portions (in particular, the outer surface portion in this case) 3a and 4a are made of synthetic resin. . In this case, the surface portions 3a and 4a are all made of metal, and the metal is provided by attaching a metal tape, for example.

  Here, for example, an aluminum foil tape or the like is preferably used as the metal tape. Further, as the synthetic resin for forming the portions 3b and 4b other than the surface portions 3a and 4a of the casing main body 3 and the casing lid body 4, ABS (acrylonitrile-butadiene-styrene copolymer) resin and PPS (polyphenylene sulfide) are used. It is preferable to use a resin or the like.

  In the casing main body 3, a pump chamber 5 is formed on the casing lid 4 side by a circular recess, and the suction port 6 and the discharge port 7 are formed so as to protrude outwardly in communication with the pump chamber 5. doing. The pump chamber 5 is formed with a convex portion 8 that isolates the suction port 6 and the discharge port 7.

  An impeller 9 is rotatably disposed inside the pump chamber 5. The impeller 9 has pump grooves 10 alternately formed with a large number of radial ribs 11 on a surface 9a on the casing main body 3 side, which is a surface on one side in the axial direction. It is located on the pump groove 10 side and has a pump groove side casing. On the other hand, the casing lid body 4 is located on the opposite side, that is, on the side of the impeller 9 opposite to the anti-pump groove 10 and is an anti-pump groove side casing. In short, the casing 2 is divided into the pump groove side and the anti-pump groove side.

The impeller 9 has shafts 12 projecting on both sides in the axial direction at the center, whereas the casing main body 3 has a bearing portion 13 at the end of the convex portion 8. One side of the shaft 12 (part on the casing main body 3 side) is supported by the bearing portion 13.
On the other hand, a circular recessed portion 14 is formed on the casing lid 4 side which is the other side surface of the impeller 9 in the axial direction, and the remaining one side of the shaft 12 (site on the casing lid 4 side) It is located at the center of the recess 14.

A ring-shaped rotor magnet 16 having a magnetic ring 15 integrally formed on the outer periphery is attached to the inner peripheral portion of the recessed portion 14. The rotor magnet 16 is magnetized so that the magnetic poles are multipolar in the circumferential direction.
In the casing lid 4, a circular recess 17 is formed on the side opposite to the casing main body 3 side, and a ring-shaped recess 18 surrounding the recess 17 is formed on the casing main body 3 side. Further, a bearing portion 19 is formed at the center of the outer bottom portion (casing main body 3 side) of the recessed portion 17, and the bearing portion 19 allows the remaining one side (on the casing lid 4 side) of the shaft 12 of the impeller 9. Part) is supported.

  A stator 20 is attached to the recessed portion 17 of the casing lid 4. The stator 20 includes a stator core 21 having a plurality of magnetic poles 21a and a stator coil 22 wound around each of the magnetic poles 21a. By combining the casing lid 4 with the casing main body 3, the rotor magnet 16 is located in the recessed portion 18 on the casing main body 3 side of the casing lid 4, and the outer peripheral surface of each magnetic pole 21 a of the stator 20 of the recessed portion 17 on the opposite side of the casing lid 4 from the casing main body 3 side. The inner circumferential surface of the rotor magnet 16 is opposed to the inner side in the radial direction with the circumferential wall 17a interposed therebetween.

Thus, the impeller 9, the magnetic ring 15, and the rotor magnet 16 constitute a rotor 23, and the rotor 23 and the stator 20 constitute a motor 24.
Note that the combined casing main body 3 and casing lid body 4 are coupled and fixed by a plurality of screws 25. The pump 1 has the above configuration.

  FIG. 4 shows a cooling device 31 using the above pump 1. The cooling device 31 includes a heat receiving portion 32 and a heat radiating portion 33 in addition to the pump 1, and the discharge port 7 of the pump 1 is connected to an inlet portion 35 of the heat receiving portion 32 by a connecting pipe 34. 32 outlets 36 are connected to an inlet 38 of the heat radiating part 33 by a connecting pipe 37, and an outlet 39 of the heat radiating part 33 is connected to the inlet 6 of the pump 1 by a connecting pipe 40. 41 is composed.

Next, the operation of the above configuration will be described.
First, a cooling fluid (for example, a liquid) is injected into the heat radiating section 33, and the heat receiving section 32 is disposed in contact with a heat generating member such as an electrical component.
In this state, if the stator coil 22 of the motor 24 in the pump 1 is energized, the rotor 23 including the impeller 9 rotates, and the pump 1 causes the heat radiating portion 33 by the liquid feeding action of the pump groove 10 by the rotation of the impeller 9. As shown by an arrow A in FIG. 4, the fluid inside is sucked into the pump chamber 5 from the suction port 6 through the connection pipe 40 and discharged through the connection pipe 34 from the discharge port 7.

  As a result, the fluid in the heat radiating section 33 is circulated in the cycle 41, and in the process, the heat is transmitted by passing through the heat receiving section 32 to which the heat generated by the heat generating member such as an electrical component is transmitted. The fluid deprived of this heat then passes through the heat radiating section 33, and the heat is released in this heat radiating section 33. Thus, the fluid is cooled, and the cooled liquid is then sucked by the pump 1, and this is repeated to cool the heat generating member such as the electric component.

  In the situation where it is used in this way, the pump 1 is a portion other than the surface portion of the casing 2, and the portions 3 b and 4 b other than the surface portions 3 a and 4 a of the casing main body 3 and the casing lid body 4 are made of synthetic resin. The surface portions 3a and 4a of the casing main body 3 and the casing lid 4 which are the surface portions of the casing 2 are all formed of metal. Therefore, the fluid loss is eliminated by the metal forming the surface portions 3a and 4a. Thus, in the cooling device 31, the amount of fluid in the cycle 41 does not become insufficient, and the cooling performance is improved. A decrease can be avoided. Therefore, maintenance for replenishing the fluid can also be eliminated.

  Further, in the portion of the casing 2 sandwiched between the rotor magnet 16 of the motor 24 and the stator 20 (the peripheral wall 17a of the recessed portion 17 on the opposite side of the casing lid 4 from the casing main body 3 side), it is entirely metal. If it is made, a large eddy current is generated by electromagnetic induction, and the loss of the motor 24 is increased. However, only the surface portion of the casing 2 (surface portion 4a of the casing lid body 4) is metal, and the other portion (4b) Is a synthetic resin, the eddy current generated is reduced and the loss of the motor 24 can be reduced.

  Note that the entire surface portion of the casing 2 is not limited to being formed entirely of metal, and even if a portion of the surface portion is formed of metal, fluid can be prevented from escaping at that portion. In the apparatus 31, the amount of fluid in the cycle 41 is not prematurely deficient, and a decrease in cooling performance can be avoided as much as possible. Accordingly, the maintenance for replenishing the fluid can be performed less frequently. Further, in that case, a part of the surface portion formed of metal includes the surface portion of the portion sandwiched between the rotor magnet 16 and the stator 20 of the motor 24, so that the generated eddy current can be reduced and the loss of the motor 24 can be reduced. Less.

In addition, in the thing of this structure, the metal of the surface part of the casing 2 is provided by the affixing of a metal tape, and it can implement | achieve easily.
The metal of the surface portion of the casing 2 may be provided by metal plating. In addition, a metal plate that becomes the surface portion is set in advance in a mold that molds the portion other than the surface portion with synthetic resin, and a portion other than the surface portion is molded by injecting a molten synthetic resin into the mold. By doing so, you may provide by insert molding which integrates it and the metal plate used as the above-mentioned surface part. Also by these, the structure which uses the surface part of the casing 2 as a metal can be easily realized.

  5 and 6 show the second embodiment (second embodiment) of the present invention. The same parts as those in the first embodiment are denoted by the same reference numerals and the description thereof is omitted. Only the different parts will be described.

  In this case, first, as shown in FIG. 5, the entire casing main body 51 which is the casing on the pump groove side of the pump 1 is made of metal, particularly metal having a thermal conductivity of 150 [W / (mk)] or more. The portion 4b other than the surface portion 4a of the casing lid 4 which is the casing on the side opposite to the pump groove is formed of synthetic resin, and the entire surface portion 4a of the casing lid 4 or the casing lid 4 A part of the surface portion 4a including the surface portion of the portion sandwiched between the stator 20 and the rotor magnet 16 is formed of metal. The metal of the surface portion is the same as described above by applying a metal tape, metal plating, or insert molding.

In this case, the metal that forms the casing main body 51 (the casing on the pump groove side) and the metal that forms all or part of the surface portion 4a of the casing lid 4 (the casing on the anti-pump groove side) Omissions are eliminated or reduced.
Also in this case, the entire surface portion 4a of the casing lid 4 on the side opposite to the pump groove and partly sandwiched between the stator 20 and the rotor magnet 16 of the motor 24, or the casing lid 4 A part of the surface portion 4a including the surface portion of the portion sandwiched between the stator 20 and the rotor magnet 16 is made of metal, and the others are made of synthetic resin. The current is reduced and the motor loss can be reduced.

  As shown in FIG. 6, the pump 1 is used in an electric device, particularly a personal computer 52. Specifically, the main body 53 of the personal computer 52 includes a keyboard (not shown), and the lid 54 provided on the main body 53 so as to be capable of opening and closing is generally provided with a liquid crystal display (also not shown). In contrast to the general configuration, the metallic casing body 51 of the pump 1 is in close contact with the CPU 55 as a heat generating member provided inside the main body 53 (under the keyboard), that is, the metallic casing The casing main body 51 is caused to function as a heat receiving portion that receives heat generated by the CPU 55.

In addition to the pump 1, the cooling device 56 includes a heat radiating portion 57, and this heat radiating portion 57 is provided inside the lid portion 54 (on the back side of the display portion). The discharge port 7 of the pump 1 is connected by a connecting pipe 59, and the outlet portion 60 of the heat radiating portion 57 and the suction port 6 of the pump 1 are connected by a connecting pipe 61.
Therefore, even in this configuration, when the pump 1 is operated, the fluid (for example, liquid in this case) put in the heat radiating portion 57 is sucked into the pump chamber 5 from the suction port 6 of the pump 1 through the connection pipe 61. By being discharged from the discharge port 7 through the connecting pipe 59, the fluid in the heat radiating portion 57 is circulated, and in the process, the heat generated by the CPU 55 is taken through the casing main body 51 (heat receiving portion) of the pump 1. .

At this time, in the heat radiating portion 57, the liquid passing therethrough is cooled, and the cooled liquid is sucked by the pump 1, and this is repeated to cool the CPU 55.
According to this, the heat generated by the CPU 55 (heating member) is taken away by the pump groove casing (casing main body 51) formed of metal of the pump 1, and the heat is absorbed by the pump groove 10 of the impeller 9. Since it can give directly to the fluid conveyed, cooling performance can be obtained efficiently.

In addition, since the pump 1 is used as an electric device, the heat generating member can be cooled by eliminating or reducing the fluid from the casing 2 and reducing the loss of the motor 24.
Even when the pump 1 is used in an electrical device such as the personal computer 52, the heat receiving portion may be provided separately from the pump 1.

Further, the surface portion of the casing 2 of the pump 1 that is entirely or partially formed of metal is not limited to the outer surface portion, and may be the inner surface portion (the pump chamber 5 side), or both. Also good.
In addition, the present invention is not limited to the embodiments described above and shown in the drawings, and can be implemented with appropriate modifications without departing from the scope of the invention.

FIG. 2 is a cross-sectional view of the pump taken along line XX in FIG. 2, showing the first embodiment of the present invention. Exploded perspective view of pump The exploded perspective view of the pump seen from the opposite side to FIG. Schematic configuration diagram of cooling device FIG. 1 equivalent view showing a second embodiment of the present invention. Perspective perspective view of a personal computer

Explanation of symbols

In the drawings, 1 is a pump, 2 is a casing, 3 is a casing main body (pump groove side casing), 3a is a surface portion, 3b is a portion other than the surface portion, 4 is a casing lid (anti-pump groove side casing), 4a is Surface portion, 4b is a portion other than the surface portion, 5 is a pump chamber, 9 is an impeller, 10 is a pump groove, 16 is a rotor magnet, 20 is a stator, 23 is a rotor, 24 is a motor, 51 is a casing main body (on the pump groove side) Casing), 52 is a personal computer (electrical device), 55 is a CPU (heat generating member), 56 is a cooling device, and 57 is a heat radiating section.

Claims (7)

A casing having a pump chamber therein and a suction port and a discharge port respectively communicating with the pump chamber;
An impeller that is rotatably arranged in the pump chamber and rotates to suck fluid from the suction port into the pump chamber and discharge the fluid from the discharge port;
A rotor magnet provided integrally with the impeller, and a motor having a stator provided so as to face the rotor magnet with a part of the casing interposed therebetween,
A part of the surface portion of the casing including the entire surface portion of the casing or the surface portion of the portion sandwiched between the stator and rotor magnet of the motor is formed of metal, and the other portions are formed of synthetic resin. A pump characterized by that. A casing having a pump chamber therein and a suction port and a discharge port respectively communicating with the pump chamber;
An impeller that is rotatably arranged in the pump chamber and rotates to suck fluid from the suction port into the pump chamber and discharge the fluid from the discharge port;
A rotor magnet provided integrally with the impeller, and a motor having a stator provided so as to face the rotor magnet with a part of the casing interposed therebetween,
The casing is divided into a pump groove side and an anti-pump groove side of the impeller, and the casing on the pump groove side is made of metal, and the stator of the motor is partly on the anti-pump groove side. All of the surface portion of the casing sandwiched between the rotor and the magnet, or a part of the surface portion including the surface portion of the casing sandwiched between the stator and the rotor magnet is made of metal, and the other portions A pump characterized by being made of synthetic resin.   3. The pump according to claim 1, wherein the metal on the surface portion of the casing is provided by attaching a metal tape.   The pump according to claim 1 or 2, wherein the metal on the surface portion of the casing is provided by metal plating.   The pump according to claim 1 or 2, wherein the metal on the surface portion of the casing is provided by insert molding. A pump according to claim 2;
A heat dissipating part that dissipates heat through the fluid discharged by the pump;
The cooling device according to claim 1, wherein the pump groove side casing of the pump is brought into contact with the heat generating member so that the fluid passing through the pump takes heat generated by the heat generating member through the pump groove side casing. A pump according to any of claims 1 to 5,
In addition to having a heat generating member whose heat is taken away by the fluid discharged from this pump,
An electric device comprising a heat radiating portion that releases heat taken from the heat generating member.

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