JP2005299552A - Pump device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pump device capable of supporting a rotary body without reducing the volume of a fluid chamber. <P>SOLUTION: This pump device 1 comprises the rotary body 10 having an impeller 12 integrally connected to a rotor 11 around which permanent magnets 11a are fixed, rotatably stored in the fluid chamber 80, and sucking and discharging a fluid, a drive part 20 disposed on the outer periphery of a partition wall part 30 demarcating the fluid chamber 80 and generating a rotating magnetic field rotatingly driving the rotor 11, a case 50 demarcating the partition wall part 30 and the fluid chamber 80, and a shaft 60 fixed, at both ends, to the partition wall part 30 and the case 50 and rotatably supporting the rotary body 10. A restriction means L restricting the movement of the rotary body 10 in the axial direction of the shaft 60 is fitted to the shaft 60. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a structure of a pump device. In particular, the present invention relates to a bearing structure of a pump device.

As a conventional pump device, a rotor which is integrally connected to a rotor having a permanent magnet fixed on its outer periphery and is rotatably accommodated in a fluid chamber, and is composed of an impeller for sucking and discharging fluid, and a partition wall defining the fluid chamber Arranged on the outer periphery of the part, a drive part for generating a rotating magnetic field for rotationally driving the rotor, a case defining a fluid chamber together with the partition part, and both ends of the partition part and the case are fixed so that the rotating body can rotate freely Some consist of a supporting shaft. However, in this device, the movement of the rotating body in the direction of the rotation axis is restricted by a support portion that supports one end of the shaft formed in the case. This support part must be provided with a restricting surface for restricting movement in the axial direction, which increases the size of the support part. For this reason, the volume of the fluid chamber defined by the case or the area of the suction portion formed in the fluid chamber decreases, leading to an increase in suction loss and further deterioration in pump efficiency. In addition, since the support portion is provided in the case, a gap between the rotating body and the support portion must be provided in consideration of variation during assembly, resulting in a decrease in pump performance (for example, FIG. 1 of Patent Document 1). reference.).
JP 2001-280284 A

  Therefore, the present invention has a technical object to support a rotating body in which an impeller is integrally formed without reducing the volume of the fluid chamber and the area of the suction portion in the pump device.

  In order to solve the above-mentioned problem, the technical means taken in the invention of claim 1 is integrally connected to a rotor having a permanent magnet fixed on the outer periphery and is rotatably accommodated in a fluid chamber, and sucks and discharges fluid. A rotating body composed of an impeller, a drive unit that is disposed on an outer periphery of a partition wall that defines the fluid chamber, generates a rotating magnetic field that rotationally drives the rotor, and a case that defines the fluid chamber together with the partition wall And a pump device comprising a shaft that is fixed at both ends to the wall portion and the case and rotatably supports the rotating body, the shaft restricts movement of the rotating body in the axial direction of the rotating body. That is, a regulation means is provided.

  According to the above means, it is not necessary to provide a restricting surface for restricting the axial movement of the rotating body on the support portion on the fluid chamber side, and the impeller is integrated without reducing the volume of the fluid chamber and the area of the suction portion. It is possible to support the rotating body formed on the substrate. Thereby, the volume of the fluid chamber or the area of the suction portion formed in the fluid chamber can be secured, and the pump efficiency can be improved.

  In order to solve the above problem, the technical means taken in the invention of claim 2 is that the restricting means is constituted by a nut fastened to the shaft.

  According to the above means, the restricting means is constituted by the nut fastened to the shaft, so that the rotating body can be assembled from the case side, and the assemblability can be improved.

  In order to solve the above-mentioned problem, the technical means taken in the invention of claim 3 is that the shaft diameter of the shaft decreases toward the case side.

  According to the above means, since the shaft diameter is reduced toward the case side, the volume of the fluid chamber or the area of the suction portion formed in the fluid chamber can be increased, and the pump efficiency can be increased. Can be improved.

  According to the present invention, it is not necessary to provide a restricting surface for restricting movement of the rotating body in the axial direction on the support section on the fluid chamber side, and the rotating body can be formed without reducing the volume of the fluid chamber and the area of the suction section. Can be supported. Thereby, the volume of the fluid chamber or the area of the suction portion formed in the fluid chamber can be secured, and the pump efficiency can be improved.

  An embodiment of the present invention will be described with reference to FIGS.

  The electric water pump (pump device) 1 circulates cooling water (fluid) in a cooling circuit (not shown) having, for example, a vehicle engine (not shown) and a radiator. The cooling water absorbs the amount of heat generated by the engine and is heated, and the radiator radiates the amount of heat and is cooled to cool the engine.

  As shown in FIG. 1, the electric water pump 1 mainly includes a rotating body 10 including an impeller 12 integrally connected to a rotor 11 having a permanent magnet 11 a fixed to the outer periphery thereof, and a rotating magnetic field that rotationally drives the rotor 11. And a water chamber (fluid chamber) 80 in which the impeller 12 is rotatably accommodated. In the electric water pump 1, the rotor 11 is rotationally driven by the rotating magnetic field generated by the drive unit 20, the impeller 12 integrated with the rotor 11 rotates in the water chamber, and the cooling water is circulated in the cooling circuit.

  As shown in FIG. 2, the rotating body 10 has a cylindrical portion 11c in which an impeller 12 is integrally formed. The magnetic member 11b is integrally fixed to the outer periphery of the cylindrical portion 11c, and the outer periphery of the magnetic member 11b has a plurality of polarities (for example, four poles in which N and S poles are alternately arranged). A permanent magnet 11a is fixed. The cylindrical portion 11c has an inner peripheral surface rotatably supported by a shaft 60 described later.

  The impeller 12 includes a base 12a that is a substantially circular plate that is perpendicular to the cylindrical portion 11c, and a blade 12b that is provided on the opposite side of the cylindrical portion 11c of the base 12a. The blade 12 b circulates the cooling water in the cooling circuit by the rotation of the impeller 12.

  In the present embodiment, the drive unit 20 is integrally configured with a partition wall 30 disposed between the rotating body 10 and the drive unit 20, and an energization control unit 40 that controls current to the drive unit 20. .

  The drive unit 20 includes a core 21 having a protrusion protruding toward the permanent magnet 11a, a coil 22 wound around the core 21, and the like, and is integrally formed by resin molding. The drive unit 20 is connected to an energization control unit 40 that controls energization of the coil 22. The energization control means 40 is provided with a connector 41 connected to a harness (not shown).

  As shown in FIG. 2, the partition wall portion 30 has a substantially bottomed cylindrical shape, and a flange portion 31 to which a case 50 defining the water chamber 80 is attached together with the partition wall portion 30 on the outer periphery of the opening. Yes. A shaft 60 extending to the water chamber 80 side is fixed to the bottom portion 32. The shaft 60 rotatably supports the rotating body 10.

  The shaft 60 is formed with a stepped portion 61 that positions a thrust washer 65 that restricts the axial movement of the rotating body 10 in the axial direction. Subsequent to the stepped portion 61, a male screw portion 62 to which a nut 70 for fixing the thrust washer 65 to the stepped portion 61 is fastened is formed. The stepped portion 61, the thrust washer 65, the male screw portion 62, and the nut 70 constitute a regulating means L. The distance from the end on the bottom 32 side of the shaft 60 to the stepped portion 61 is set to be substantially the same as the axial length of the rotating body 10. Thereby, the movement of the rotating body and the axial direction can be reduced. The end of the shaft 60 on the water chamber 80 side is fixed to a support portion 53 formed on the case 50. The shaft diameter decreases from the stepped portion 61 of the shaft 60 to the end portion on the water chamber 80 side.

  The case 50 includes a suction part 51 that is connected to a radiator and sucks cooling water, and a discharge part 52 that is connected to the engine and discharges cooling water to the engine. Further, the case 50 is watertightly fixed to the flange portion 31 of the partition wall portion 30 via the sealing member 55 by the fastening member 56, and defines a water chamber 80 together with the partition wall portion 30. As described above, the diameter from the stepped portion 61 of the shaft 60 to the end portion on the water chamber 80 side is reduced, so that the volume of the water chamber 80 and the area of the suction portion 51 can be increased, and the pump performance. Can be improved.

  Next, the operation of the electric water pump 1 will be described.

  When the drive unit 20 is energized by an external signal through the energization control means 40 that controls energization, the permanent magnet 11a having a plurality of magnetic poles in the circumferential direction rotates. By rotating the cylindrical portion 11c to which the permanent magnet 11a is fixed, the impeller 12 integrally formed with the cylindrical portion 11c rotates, and the cooling water is sucked from the suction portion 51 by the blades 12b and discharged from the discharge portion 52. At this time, since the rotating body 10 restricts the axial movement of the shaft 60 by the restricting means L, the support portion 53 of the case 50 is not provided with a restricting surface for restricting the axial movement of the rotating body 10. The rotating body 10 can be supported without reducing the volume of the fluid chamber 80 and the area of the suction portion. Thereby, the volume of the fluid chamber 80 or the area of the suction part 51 formed in the fluid chamber 80 can be secured, and the pump efficiency can be improved.

It is sectional drawing of the pump apparatus 1 in embodiment of this invention. It is an assembly drawing of the rotary body 10 in embodiment of this invention.

Explanation of symbols

1 ... Electric water pump (pump device)
DESCRIPTION OF SYMBOLS 10 ... Rotating body 11 ... Rotor 11a ... Permanent magnet 12 ... Impeller 20 ... Drive part 30 ... Partition part 50 ... Case 60 ... Shaft 61 ... Stepped Department (regulatory means)
62 ... Male thread (regulation means)
65 ... Thrust washer (regulation means)
70 ... Nut (regulation means)
80 ... Fluid chamber L ... Regulatory means

Claims (3)

A rotating body composed of an impeller that is integrally connected to a rotor having a permanent magnet fixed to the outer periphery and is rotatably accommodated in a fluid chamber, and sucks and discharges fluid;
A driving unit that is disposed on an outer periphery of a partition wall that defines the fluid chamber, and that generates a rotating magnetic field that rotates the rotor;
A case defining the fluid chamber together with the partition;
In the pump device constituted by the partition wall and the case, both ends thereof being fixed to the case, and a shaft for rotatably supporting the rotating body,
The pump device according to claim 1, wherein the shaft is provided with restricting means for restricting movement of the rotating body in a shaft axial direction.   The pump device according to claim 1, wherein the restricting unit includes a nut fastened to the shaft.   The pump device according to claim 1, wherein the shaft has a shaft diameter that decreases toward the case.

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