JP2005320918A - Fluid pump device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fluid pump device capable of restraining an increase in manufacturing cost by improving heat radiating performance. <P>SOLUTION: This fluid pump device 1 is composed of a motor part 2 having a stator 7 stored in a can part 6 and a rotor 10 rotatably arranged around the stator 7, and a pump part 3 having a pump chamber 28 provided with an impeller 26 for rotating together with the rotor 10. A cooling water circulating hole 6e is formed in the center of the can part 6 for storing the stator 7. The cooling water circulating hole 5e is formed in a revolving shape along the inner periphery of the stator 7 on the anti-pump part 3 side for sandwiching a bearing fixing part 13. When the fluid pump device 1 operates, the impeller 26 rotates together with rotation of the rotor 10, and a circulating liquid is introduced to the pump room 28. A part of the introduced circulating liquid is introduced to the cooling water circulating hole 6e. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a fluid pump device, and more particularly to a cooling structure in a fluid pump device using an outer rotor type brushless motor.

  Conventionally, a fluid pump device using an outer rotor type brushless motor is known. When this fluid pump device is operated, a coil provided in the stator generates heat in the motor unit for rotating the impeller. Generally, a fluid pump device using an outer rotor type brushless motor has a structure in which heat generated from the coil is hardly dissipated to external air or circulating fluid because a coil with heat generation is provided inside the rotor. . Therefore, the heat generated from the coil is trapped inside the motor unit, which adversely affects the control circuit device that controls the motor unit.

  Therefore, Patent Document 1 discloses a fluid pump device having a configuration for improving heat dissipation. In the fluid pump device disclosed in Patent Document 1, the pump unit and the motor unit are integrated. The motor unit includes a cylindrical motor side case. An air vent hole is formed at the end of the motor side case on the side opposite to the pump. Moreover, the opening part which connects the inside and outside of this motor side case is formed in the side wall of the motor side case. Further, in the motor side case, a plurality of vent holes are formed in the circuit board disposed between the stator provided with the coil and the pump chamber. When such a fluid pump device is operated, external air is taken in as cooling air from a ventilation hole formed in the end of the motor side case. And the taken-in cooling air cools a core and a coil by passing between the teeth parts of a core, Then, it is discharged | emitted outside from an opening part. A part of the cooling air taken into the motor unit cools the circuit device through a hole formed in the circuit board, and is then discharged from the opening.

Incidentally, an outer rotor type fluid pump device using a brushless motor is also known as shown in FIG. A fluid pump device 40 shown in FIG. 3 includes a motor unit 41 and a pump unit 42. The motor unit 41 includes a motor side case 43, a rotor 44, and a stator 46 including a coil 45. The pump unit 42 includes an impeller 47 attached to the rotor 44 and rotated integrally with the rotor 44. That is, in the fluid pump device 40, the rotor 44 of the motor unit 41 is disposed in the path of the circulating fluid that is sucked and discharged by the fluid pump device 40. Therefore, in the fluid pump apparatus 40, the cooling method as described in Patent Document 1 cannot be applied. However, a slight cooling effect is expected because the heat of the coil 45 provided in the stator 46 is transmitted to the circulating fluid through the can portion 49 that accommodates the stator 46, but the coil 45 is sufficiently cooled. I can't. For this reason, in the fluid pump device 40, it is conceivable that the control circuit device 48 is provided with a heat dissipation structure, or a circuit element that can be adapted to the use environment, that is, the atmospheric temperature that is high.
JP 2000-274399 A

  However, if the control circuit device 48 of the fluid pump device 40 is provided with a heat dissipation structure, there is a problem that the manufacturing cost increases. In addition, circuit elements that can be adapted to high atmospheric temperatures are generally expensive, and the use of such circuit elements also causes an increase in manufacturing costs. Therefore, the control circuit device does not have a heat dissipation structure or uses a circuit element that can be adapted to the usage environment, and improves heat dissipation in the structure of the fluid pump device to suppress an increase in the ambient temperature. It is desirable.

  This invention is made | formed in view of such a situation, The objective is to provide the fluid pump apparatus which can suppress the increase in manufacturing cost by improving heat dissipation.

  In order to solve the above-mentioned problem, the invention described in claim 1 is a stator provided with a coil, a rotor disposed outside the stator and supported by a rotating shaft portion, and rotated together with the rotation of the rotor. Fluid pump device comprising an impeller, a pump chamber in which the impeller is disposed and circulating fluid is sucked and discharged by rotation of the impeller, and a control circuit device that includes a circuit element and supplies a drive current to the coil And the cooling water circulation part by which circulating fluid is introduce | transduced inside the said stator was provided.

  According to a second aspect of the present invention, in the fluid pump device according to the first aspect of the present invention, the cooling water circulation portion is formed in a circular shape along the inner periphery of the stator on the side opposite to the pump chamber across the rotating shaft portion. Is formed.

  According to a third aspect of the present invention, in the fluid pump device according to the first or second aspect, the rotary shaft portion includes a submerged bearing, and the cooling water circulation portion is located on the side opposite to the pump chamber from the rotary shaft portion. It is recessed toward.

  According to a fourth aspect of the present invention, in the fluid pump device according to any one of the first to third aspects, the rotating shaft portion enters the inside of the stator along the axial direction of the stator. It is formed with.

  According to a fifth aspect of the present invention, in the fluid pump device according to any one of the first to fourth aspects, the circulation of the circulating fluid in the cooling water circulation section is promoted on the outer peripheral surface of the rotating shaft section. A circulation promoting part is formed.

(Function)
According to invention of Claim 1, the fluid pump apparatus is provided with the cooling water circulation part. When the fluid pump device is operated, a part of the circulating fluid is introduced into the cooling water circulation section, and the inside of the stator is cooled by the introduced circulating fluid. Therefore, the heat generated from the coils provided in the stator is radiated to the circulating fluid introduced into the cooling water circulation section, and the rise in the ambient temperature in the fluid pump device is suppressed. As described above, since the heat radiation performance is improved by providing the cooling water circulation section, it is not necessary to provide a heat radiation structure to the control circuit device or use a circuit element that can be adapted to an atmospheric temperature that becomes a high temperature. Therefore, an increase in manufacturing cost can be suppressed.

  According to the second aspect of the invention, since the cooling water circulation part is formed on the side opposite to the pump chamber with the rotating shaft part interposed therebetween, the circulating fluid is introduced to the stator side provided with the coil that generates heat. Moreover, since the cooling water circulation part is formed in the surrounding shape along the inner periphery of a stator, the surface area of a cooling water circulation part becomes larger. Therefore, the area for cooling the stator is increased, and the heat dissipation can be further improved.

  According to invention of Claim 3, the cooling water circulation part is recessedly provided toward the anti-pump chamber side from the rotating shaft part side provided with the underwater bearing. Therefore, the circulating fluid is easily introduced into the cooling water circulation section from the pump chamber side via the underwater bearing.

  According to the fourth aspect of the present invention, the rotating shaft portion is formed so as to enter the inside of the stator along the axial direction of the stator. Accordingly, the proportion of the rotary shaft portion in the pump chamber can be reduced, and the flow path of the circulating fluid can be expanded. When the flow path of the circulating fluid is enlarged, the flowing water resistance is reduced and the pump efficiency is increased.

  According to the fifth aspect of the present invention, circulation of the circulating fluid introduced into the cooling water circulation section is promoted by the circulation promotion section formed on the outer peripheral surface of the rotating shaft section. When circulation of the circulating fluid is promoted, the circulating fluid that has absorbed heat is discharged one after another, and cooling water that has not yet absorbed heat is successively introduced into the cooling water circulation section, further improving the heat dissipation of the stator. Can be made.

  ADVANTAGE OF THE INVENTION According to this invention, the fluid pump apparatus which can suppress the increase in manufacturing cost by improving heat dissipation can be provided.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 shows a fluid pump device 1 according to this embodiment. The fluid pump device 1 is used to circulate cooling water of a radiator mounted on an automobile.

  As shown in FIG. 1, the fluid pump device 1 includes a motor unit 2 and a pump unit 3. The motor unit 2 includes a cylindrical motor side case 4 made of synthetic resin. The end of the motor side case 4 on the side opposite to the pump part 3 is closed by an end frame 5.

  A can portion 6 formed integrally with the motor side case 4 is provided inside the motor side case 4. The can portion 6 includes an annular housing hole 6 a for housing the stator 7. The accommodation hole 6a has an opening 6b on the side opposite to the pump part 3. The stator 7 accommodated in the accommodation hole 6a includes a stator core 8 and a coil 9 formed by winding a winding around the stator core 8.

  A rotor 10 is rotatably accommodated between the motor side case 4 and the can portion 6. The rotor 10 has a gap 11 between the rotor 10 and the motor-side case 4 and the can portion 6 through which circulating fluid (in this embodiment, cooling water for the radiator) can circulate in the fluid pump device 1. Arranged. The rotor 10 includes a cylindrical portion 10a that is magnetized and a disk-shaped impeller fixing portion 10b that covers an end portion of the cylindrical portion 10a on the pump portion 3 side. A bearing fixing portion 13 is formed at the center of the impeller fixing portion 10b. The bearing fixing portion 13 is formed to protrude from the impeller fixing portion 10 b toward the anti-pump portion 3, and enters the inside of the stator 7 along the axial direction of the stator 7. The bearing fixing portion 13 is accommodated in an accommodation hole 6 c formed so as to enter the inside of the stator 7 in the center of the end portion on the pump portion 3 side of the can portion 6. A gap 14 communicating with the gap 11 is provided between the outer peripheral surface of the bearing fixing portion 13 and the inner peripheral surface of the accommodation hole 6c.

  As shown in FIG. 2, a spiral groove 13 a as a circulation promoting portion is formed on the outer peripheral surface of the bearing fixing portion 13. The spiral groove 13 a is a groove formed in a spiral shape on the outer peripheral surface of the bearing fixing portion 13. As shown in FIG. 1, a housing hole 13b is formed in the center of the bearing fixing portion 13, and an underwater bearing 15 is housed in the housing hole 13b. Circulating fluid (in this embodiment, cooling water for the radiator) can flow between the outer peripheral surface of the underwater bearing 15 and the inner peripheral surface of the bearing fixing portion 13. The underwater bearing 15 holds a rotating shaft 16 that rotatably supports the rotor 10. The end of the rotary shaft 16 on the side opposite to the pump portion 3 is fixed to a fixing hole 6d formed at the center of the bottom of the accommodation hole 6c. The bearing fixing portion 13, the underwater bearing 15, and the rotating shaft 16 constitute a rotating shaft portion.

  A cooling water circulation hole 6e as a cooling water circulation part is formed at the bottom of the accommodation hole 6c. The cooling water circulation hole 6 e is formed in a circular shape along the inner periphery of the stator 7 on the side opposite to the pump portion 3 (on the side of the anti-pump chamber 28 described later) sandwiching the bearing fixing portion 13. In other words, the cooling water circulation hole 6e formed around the fixing hole 6d is an annular hole, and is recessed from the bearing fixing portion 13 fixing the underwater bearing 15 toward the anti-pump portion 3 side. Yes. The cooling water circulation hole 6 e communicates with the gap 14.

  A control circuit device 17 that controls the operation of the fluid pump device 1 is disposed on the opening 6 b side of the can portion 6. The control circuit device 17 includes a circuit board 19 on which a plurality of circuit elements 18 are fixed. The circuit board 19 is fixed to the center portion of the can portion 6 by screws 20. In addition, wirings 21 to 23 for supplying power from the outside are connected to the circuit board 19. The wires 21 to 23 come out of the fluid pump device 1 from the insertion hole 5a formed in the end frame 5 and are connected to an in-vehicle battery (not shown).

  The pump unit 3 includes a pump cover 25 and an impeller 26. The pump cover 25 is fixed to the motor side case 4 with screws 27. A region surrounded by the pump cover 25 and the impeller fixing portion 10 b of the rotor 10 is a pump chamber 28. The gap 11 communicates with the pump chamber 28.

  The impeller 26 is accommodated in the pump chamber 28 and includes a disk-shaped substrate portion 26a and a plurality of blade portions 26b formed integrally with the substrate portion 26a. An inflow hole 26 c is formed at the center of the impeller 26. The substrate portion 26 a is fixed to the impeller fixing portion 10 b of the rotor 10. A plurality of blade portions 26b are radially arranged on the surface of the substrate portion 26a on the side opposite to the motor portion 2. Such an impeller 26 rotates integrally with the rotor 10 when the rotor 10 rotates.

  The pump cover 25 includes a cylindrical suction portion 25 a that protrudes outward and is formed integrally with the pump cover 25 at the center thereof. The tip of the suction part 25a is a suction port 25b. A support member 29 for fixing the end portion of the rotating shaft 16 on the pump portion 3 side is disposed inside the base end portion of the suction portion 25a. The support member 29 includes a shaft portion 29 b in which a fixing hole 29 a that fixes the rotating shaft 16 is formed, and a fixing portion 29 c that fixes the shaft portion 29 b to the pump cover 25. A space formed by the outer peripheral surface of the shaft portion 29b and the inner peripheral surface of the inflow hole 26c of the impeller 26 becomes a flow path 30 through which the circulating fluid sucked from the suction port 25b passes.

A discharge passage 31 is formed on the outer periphery of the pump cover 25 and is located on the radially outer side of the impeller 26. The discharge passage 31 communicates with a discharge port (not shown).
In the fluid pump device 1 configured as described above, when a driving current is supplied from the control circuit device 17 to the coil 9, a rotating magnetic field is generated in the stator 7 based on the driving current, and based on the rotating magnetic field. The rotor 10 rotates. When the impeller 26 is rotated by the rotation of the rotor 10, the circulating fluid flows into the pump chamber 28 from the suction port 25b. The circulating fluid that has flowed in is drawn toward the blade portion 26b through the flow path 30 and the inflow hole 26c. The circulating fluid flows into the discharge passage 31 from the radially outer side of the impeller 26 and is ejected from the discharge port.

  At this time, part of the circulating fluid is introduced from the flow path 30 between the inner peripheral surface of the bearing fixing portion 13 and the outer peripheral surface of the underwater bearing 15 into the cooling water circulation hole 6e. Then, the heat generated by the coil 9 is radiated to the circulating fluid introduced into the cooling water circulation hole 6e, and the inside of the stator 7 is cooled. The circulating fluid that has cooled the inside of the stator 7 flows into the discharge passage 31 through the gap 14 and the gap 11 and is discharged from the discharge port. At that time, since the spiral groove 13a is formed on the outer peripheral surface of the bearing fixing portion 13, when the rotor 10 rotates and the bearing fixing portion 13 rotates, the outer peripheral portion of the bearing fixing portion 13, that is, the gap 14 and the cooling water circulation hole. In 6e, a vortex is generated and the circulation of the circulating fluid is promoted.

As described above, the present embodiment has the following effects.
(1) The fluid pump device 1 includes a cooling water circulation hole 6e. When the fluid pump device 1 is operated, a part of the circulating fluid is introduced into the cooling water circulation hole 6e, and the inside of the stator 7 is cooled by the introduced circulating fluid. Therefore, the heat generated from the coil 9 provided in the stator 7 is radiated to the circulating fluid introduced into the cooling water circulation hole 6e, and the rise in the ambient temperature in the fluid pump device 1 is suppressed. Since the heat dissipation is improved by providing the cooling water circulation hole 6e in this manner, it is necessary to provide the control circuit device 17 with a heat dissipation structure or to use a circuit element that can be adapted to a high ambient temperature. Therefore, an increase in manufacturing cost can be suppressed.

  (2) Since the cooling water circulation hole 6e is formed on the anti-pump part 3 side (anti-pump chamber 28 side) sandwiching the bearing fixing part 13, the underwater bearing 15 and the rotating shaft 16, the coil 9 accompanied by heat generation is provided. Circulating fluid is introduced to the provided stator 7 side. In the fluid pump device 1, since the control circuit device 17 is fixed to the side opposite to the pump 3 of the can 6 in which the stator 7 is accommodated, the cooling water circulation hole 6 e is connected to the side opposite to the pump 3 (on the side opposite the impeller 26 ), The influence of the heat generated by the coil 9 on the control circuit device 17 can be further reduced.

  (3) Since the cooling water circulation hole 6e is formed in a circular shape along the inner periphery of the stator 7, the surface area of the cooling water circulation hole 6e is increased. Therefore, the area for cooling the stator 7 is increased, and the heat dissipation can be further improved.

  (4) The cooling water circulation hole 6e is recessed from the bearing fixing portion 13 including the underwater bearing 15 toward the anti-pump portion 3 side (the anti-pump chamber 28 side). Therefore, the circulating fluid is easily introduced into the cooling water circulation hole 6 e from the pump unit 3 side through the underwater bearing 15.

  (5) Since the bearing fixing portion 13 is formed so as to enter the inside of the stator 7 along the axial direction of the stator 7, the underwater bearing 15 and the rotating shaft 16 are also in positions where they enter the inside of the stator 7. Retained. Therefore, the ratio of the bearing fixing portion 13, the underwater bearing 15, and the rotating shaft 16 in the pump chamber 28 is reduced, so that the circulating fluid passage 30 can be enlarged. As a result, running water resistance is reduced and pump efficiency is increased.

  (6) Since the spiral groove 13a is formed on the outer peripheral surface of the bearing fixing portion 13, when the rotor 10 rotates, a vortex is generated in the gap 14 and the cooling water circulation hole 6e, and the circulation of the circulating fluid is promoted. When the circulation of the circulating fluid is promoted, the circulating fluid that has absorbed the heat generated from the coil 9 is discharged one after another, and the circulating fluid that has not yet absorbed the heat is successively introduced into the cooling water circulation hole 6e. Therefore, the heat dissipation in the stator 7 can be further improved.

In addition, you may change embodiment of this invention as follows.
In the above embodiment, the spiral groove 13a is formed on the outer peripheral surface of the bearing fixing portion 13 as the circulation promoting portion, but is not limited thereto. For example, instead of the spiral groove 13a, a ridge portion formed continuously in a spiral shape on the outer peripheral surface of the bearing fixing portion 13 may be provided. Even if comprised in this way, the effect similar to the said embodiment can be acquired.

  In the above embodiment, since the underwater bearing 15 is used, the circulating fluid is introduced between the outer peripheral surface of the underwater bearing 15 and the inner peripheral surface of the bearing fixing portion 13 into the cooling water circulation hole 6e. However, the present invention is not limited to this. For example, a hole may be formed in the bearing fixing portion 13 so that the circulating fluid can flow and the pump chamber 28 and the cooling water circulation hole 6e communicate with each other, and the circulating liquid may be introduced into the cooling water circulation hole 6e.

  In the above embodiment, the cooling water circulation hole 6e is formed in a circular shape along the inner periphery of the stator 7, but is not limited thereto. For example, the cooling water circulation hole 6e may be a plurality of holes (not circular) provided around the fixed hole 6d inside the stator 7.

In the above embodiment, the fluid pump device 1 is used to circulate cooling water of a radiator mounted on an automobile, but may be used for other purposes.
The technical idea that can be grasped from the above embodiment will be described below.

(A) The fluid pump device according to claim 5, wherein the circulation promoting portion is a spiral groove formed in a spiral shape on an outer peripheral surface of the rotating shaft portion.
If comprised in this way, when the rotating shaft part in which the spiral groove was formed rotates, a vortex | eddy_current will generate | occur | produce in the outer peripheral part of a rotating shaft part, and it can promote the circulation of a circulating fluid. When the circulation of the circulating fluid is promoted, the circulating fluid that has absorbed the heat generated from the coil is discharged one after another, and the circulating fluid that has not yet absorbed the heat is successively introduced into the cooling water circulation section. The heat dissipation can be further improved.

Sectional drawing which shows a fluid pump apparatus. The front view of a bearing fixing | fixed part. Sectional drawing which shows the conventional fluid pump apparatus.

Explanation of symbols

  6e ... Cooling water circulation hole as cooling water circulation part, 7 ... Stator, 9 ... Coil, 10 ... Rotor, 13 ... Bearing fixing part constituting rotating shaft part, 15 ... Underwater bearing constituting rotating shaft part, 16 ... Rotating shaft Rotating shaft constituting part, 17 ... control circuit device, 18 ... circuit element, 26 ... impeller, 28 ... pump chamber.

Claims (5)

A stator with a coil;
A rotor disposed on the outside of the stator and supported by a rotating shaft portion to rotate;
An impeller that rotates with the rotation of the rotor;
A pump chamber in which the impeller is disposed and the circulating fluid is sucked and discharged by rotation of the impeller;
A fluid pump device comprising a circuit element and a control circuit device for supplying a drive current to the coil,
A fluid pump device comprising a cooling water circulation section into which a circulating liquid is introduced inside the stator. The fluid pump device according to claim 1,
The fluid pump device according to claim 1, wherein the cooling water circulation part is formed in a circular shape along the inner circumference of the stator, on the side opposite to the pump chamber with the rotating shaft part interposed therebetween. The fluid pump device according to claim 1 or 2,
The rotating shaft portion includes an underwater bearing,
The fluid pump device, wherein the cooling water circulation part is recessed from the rotating shaft part toward the non-pump chamber side. The fluid pump device according to any one of claims 1 to 3,
The fluid pump device according to claim 1, wherein the rotating shaft portion is formed to enter the inside of the stator along the axial direction of the stator. The fluid pump device according to any one of claims 1 to 4,
The fluid pump device according to claim 1, wherein a circulation promoting part for promoting circulation of the circulating fluid in the cooling water circulation part is formed on an outer peripheral surface of the rotating shaft part.

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