JP2012092743A - Fluid pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve the improvement of heat radiation at a motor part, and to prevent fluid leakage.SOLUTION: The fluid pump includes a pump part 2, a motor part 3 having a fixed stator 32 and a rotor 36 rotatably set therein and driving the pump part 2, a motor housing 31 housing at least the motor part 3, a synthetic resin cylindrical partition part 35b engaged with the motor housing 31 and intercepting the stator 32 from a rotor 36, a bypass path 39 bypassing a part of the fluid flowing through the pump part 2 to an inner space part of the cylindrical partition part 35b as for cooling, and a seal ring S set between the engaging faces of the cylindrical partition part 35b and motor housing 31. The motor housing 31 is composed of a material having higher heat resistance than the cylindrical partition part 35b. A deformation suppressing mechanism B is provided for suppressing creep deformation of the cylindrical partition part 35b due to the abutting force of the seal ring S.

Description

  The present invention includes, for example, a pump unit that uses centrifugal force of a fluid generated by rotational driving of an impeller, a motor unit that drives the pump unit, a motor housing that houses at least the motor unit, and an inner periphery of the motor housing A stator fixed to a part, a rotor provided on a rotation drive shaft of the motor part on the inner peripheral side of the stator, a cylindrical partition part made of a synthetic resin that blocks between the stator and the rotor, The present invention relates to a fluid pump provided with a bypass for bypassing a part of the fluid flowing through the pump part to the inner space of the cylindrical partition part for cooling.

Conventionally, in this type of fluid pump, the stator is enclosed in a bottomed cylindrical cylindrical member formed of synthetic resin, and the rotor is rotatable around the cylinder axis in the inner space of the cylindrical member. Some of them are arranged (see, for example, Patent Document 1), and the stator and the rotor are blocked in a sealed state by the cylindrical partition wall and the bottom of the cylindrical member.
Therefore, the fluid flowing in the bypass around the rotor is blocked by the cylindrical member made of synthetic resin, and is prevented from leaking to the stator side.

JP 2010-144893 A (FIG. 1)

According to the above-described conventional fluid pump, although the water shielding between the stator and the rotor is ensured, the cylindrical member is made of synthetic resin, so the heat dissipation is inferior, and the controller that controls the rotation of the motor unit. There is a problem that it is difficult to heat well.
In general, if only the heat dissipation of the cylindrical member is considered, it is preferable to use a metal such as aluminum instead of the synthetic resin. However, since it is necessary to ensure the insulation of the stator, at least the stator The surrounding portion is preferably made of a synthetic resin.
Therefore, the cylindrical partition that blocks between the stator and the rotor is made of synthetic resin so as to satisfy both the improvement of heat dissipation and the insulation, while the adjacent bottom portion is made of a metal motor housing. What constitutes a part of is conceivable. In addition, it is necessary from the viewpoint of maintaining waterproofness that the cylindrical partition wall portion and the bottom portion have a fitting structure and a seal ring is provided between the fitting surfaces.
However, the elastic restoring force of the seal ring continues to act on the mating surface between the cylindrical partition and the bottom, but creep deformation occurs in the cylindrical partition made of synthetic resin under a high temperature environment. As a result, there is a possibility that the resistance against the seal ring is lowered, and as a result, the waterproofness due to the seal ring is lowered, and a new problem is likely to occur that the fluid leaks easily.

  Accordingly, an object of the present invention is to provide a fluid pump that solves the above-described problems and that can improve heat dissipation in the motor unit and prevent fluid leakage.

  A first characteristic configuration of the present invention includes a pump unit, a motor unit that includes a fixed stator and a rotor that is rotatably disposed on an inner peripheral side thereof, and that drives the pump unit, and at least the motor unit A motor housing that houses the cylinder, a synthetic resin-made cylindrical partition wall that fits into the motor housing and blocks between the stator and the rotor, and a part of the fluid that flows through the pump unit is used for cooling A detour that bypasses the inner space of the cylindrical partition wall, and a seal ring that is provided between the fitting surfaces of the cylindrical partition wall and the motor housing, the motor housing having the cylindrical shape It is made of a material having higher heat resistance than the partition wall, and is provided with a deformation suppressing mechanism that suppresses creep deformation of the cylindrical partition wall due to the contact force of the seal ring.

According to the first characteristic configuration of the present invention, the heat generated in the motor unit can be radiated through the motor housing, and the heat dissipation of the motor unit can be improved.
Furthermore, since a deformation suppression mechanism is provided, creep deformation of the cylindrical partition wall that receives the contact force of the seal ring in a thermal environment can be suppressed. As a result, the resistance against the seal ring at the fitting surface between the motor housing and the cylindrical partition wall can be maintained, the waterproof property by the seal ring can be secured, and the fluid leakage from the motor can be prevented.

  According to a second characteristic configuration of the present invention, the deformation suppressing mechanism is fitted into the cylindrical partition wall portion in a cylindrical engagement portion between the motor housing provided with the seal ring and the cylindrical partition wall portion. The band member is provided.

  According to the second characteristic configuration of the present invention, in the cylindrical fitting portion, the cylindrical partition wall portion is deformed in the diameter increasing direction by the band member from the outer peripheral side of the cylindrical partition wall portion fitted on the motor housing. It is possible to suppress creep deformation of the cylindrical partition wall portion in the cylindrical fitting portion with a simple structure.

  According to a third characteristic configuration of the present invention, the deformation suppressing mechanism is configured such that, in the cylindrical fitting portion between the motor housing and the cylindrical partition wall portion where the seal ring is installed, the cylindrical partition wall portion is separated from the motor housing. It exists in the place comprised by the cylindrical part provided in the protrusion state in the outer peripheral surface.

According to the third characteristic configuration of the present invention, in the cylindrical fitting portion, the cylindrical partition wall portion extends in the diameter increasing direction from the outer peripheral side of the cylindrical partition wall portion fitted on the motor housing. It is possible to suppress the deformation of the cylindrical partition wall, and it is possible to reliably suppress the creep deformation of the cylindrical partition wall portion in the cylindrical fitting portion while having a simple structure.
In addition, the creep deformation of the cylindrical partition wall can be suppressed only by the cylindrical part of the motor housing without using a separate member, so the number of parts is reduced, and the parts management and the fitting operation at the cylindrical fitting part are reduced. The labor can be reduced and the material cost can be reduced.

Sectional view in the direction perpendicular to the rotational axis of the fluid pump Sectional drawing by the direction view orthogonal to the rotating shaft core of the fluid pump of another embodiment Sectional drawing by the direction view orthogonal to the rotating shaft core of the fluid pump of another embodiment

Embodiments of the present invention will be described below with reference to the drawings.
As shown in FIG. 1, the fluid pump 1 according to this embodiment includes a pump unit 2, a motor unit 3 that drives the pump unit 2, and a driver unit 4 that controls the motor unit 3. The fluid pump 1 is attached to a vehicle engine (not shown) on the side of the pump unit 2 and functions as a water pump for circulating engine coolant.

  The pump housing 21 that houses the pump unit 2 is made of a conductive material, and has a cylindrical suction port 21a and a discharge port 21b. The suction port 21a and the discharge port 21b communicate with an impeller chamber 21c formed inside the pump housing 21, respectively. An impeller 22 is accommodated in the impeller chamber 21c. When the impeller 22 rotates, fluid is sucked into the impeller chamber 21c from the suction port 21a and fluid is discharged from the impeller chamber 21c to the discharge port 21b.

  The motor housing 31 that houses the motor unit 3 is made of an aluminum material. Since the aluminum material has conductivity, it can be used to install the substrate 42 of the driver unit 4. In addition, since the aluminum material has high thermal conductivity, the heat generated in the motor unit 3 can be easily radiated through the motor housing 31. However, the motor housing 31 can be made of other materials as long as it has a certain conductivity and thermal conductivity.

  Inside the motor housing 31, a stator 32, a rotor 36 disposed radially inside the stator 32, and a support shaft 38 that is a rotation support shaft of the rotor 36 are provided. The stator 32 is provided with a coil 33, and the stator 32 and the coil 33 are cast by a stator housing 35 made of synthetic resin.

A portion of the stator housing 35 facing the rotor 36 in particular is referred to as a cylindrical partition wall portion 35 b and blocks between the stator 32 and the rotor 36.
In the stator housing 35, a flange portion 35 a formed on the pump portion 2 side and one end portion 35 c of the cylindrical partition wall portion 35 b are fixed to the motor housing 31.
The flange portion 35a is bolted while being sandwiched between the pump housing 21 and the motor housing 31.
The one end 35c is fixed in a state of being fitted around a cylindrical projecting portion 31d formed on the back surface side (pump portion side) of the end surface 31a of the motor housing 31.

One end portion 35c of the cylindrical partition wall portion 35b extends in a cylindrical shape from the stator 32 toward the driver portion 4, and the cylindrical fitting portion is formed by the one end portion 35c and the protruding portion 31d of the motor housing 31. K is configured.
Between the fitting surface of the one end 35c and the protrusion 31d in the cylindrical fitting portion K, a seal ring S made of an elastic body is provided over the entire circumference, and the elastic restoring force of the seal ring S is provided. Therefore, the tubular fitting portion K is water-stopped. In this embodiment, the seal ring S is housed in a circumferential groove formed on the motor housing 31 side on the fitting surface.
The similar seal ring S is, for example, between the mating surfaces of the motor housing 31 and the pump housing 21 with respect to the flange portion 35a, and between the mating joints of the motor housing 31 and the cover 41 with respect to a pedestal 43 described later. Is also installed.

Further, a metal band member B1 is fitted over the entire outer periphery of the one end portion 35c of the cylindrical partition wall portion 35b.
This band member B1 is intended to prevent creep deformation of the one end portion 35c made of synthetic resin. That is, at the one end portion 35c made of synthetic resin, the elastic restoring force of the seal ring S continues to act in the diameter-expanding direction, so that the environmental temperature is high due to heat generated by the motor unit 3 and the driver unit 4. As a result, the one end portion 35c is easily creep-deformed in the diameter expansion direction. Therefore, by restraining the one end portion 35c from the outside by the band member B1, the creep deformation in the diameter increasing direction of the one end portion 35c can be suppressed, and the water stop effect by the seal ring S can be maintained. it can.
A deformation suppression mechanism B is configured by the band member B1.

  In the inner space of the cylindrical partition wall 35b, a bypass 39 is formed between the rotor 36 and a part of the fluid flowing through the pump 2 for cooling. The motor part 3 and the driver part 4 are cooled by the fluid flowing through the.

A terminal 34 for electrically connecting the coil 33 and the substrate 42 of the driver unit 4 protrudes from the opening 31 b formed in the end surface 31 a of the motor housing 31 toward the driver unit 4.
In addition, a groove-like heat radiating portion 31 c constituting a part of the bypass 39 is formed on the inner diameter side of the protruding portion 31 d formed on the inner side of the end surface of the motor housing 31. Therefore, the heat generated in the driver unit 4 is recovered by the fluid in the heat radiating unit 31c via the motor housing 31, so that the temperature rise of the driver unit 4 can be suppressed.

  The rotor 36 is integrally formed with one end of a rotating member 37 formed of a synthetic resin. When a current flows through the coil 33 and a rotating magnetic field is generated in the stator 32, the rotor 36 and the rotating member 37 are supported on the spindle. Rotate integrally with 38 as a rotation support shaft. When the rotating member 37 rotates, the impeller 22 formed at the other end of the rotating member 37 rotates and the pump unit 2 operates.

The driver unit 4 includes a driver ASSY 48 including a substrate 42 and a base 43 made of synthetic resin in a space defined by the end surface 31 a of the motor housing 31 and the cover 41. The pedestal 43 is formed with a connector portion 43a, and the connector portion 43a is provided with a connector terminal 46 for electrically connecting a power source (not shown) and the substrate 42. Of the connector terminals 46, terminal portions 46 a protruding from the base 43 are connected to the substrate 42. Further, the substrate 42 is electrically connected to the motor housing 31 via the connection member 44.
The driver ASSY 48 is provided with an electronic element, and is configured so that the rotation of the motor unit 3 can be controlled via the terminal 34.

  The pump housing 21 and the motor housing 31 are fastened together by a conductive bolt 51 with a flange portion 35a of a synthetic resin stator housing 35 interposed therebetween. With this configuration, even if the non-conductive stator housing 35 exists between the pump housing 21 and the motor housing 31, the board 42 is connected to the connecting member 44, the motor housing 31, the bolt 51, the pump housing 21, and the non-conductive stator housing 35. It can be grounded via the illustrated engine or the like.

According to the fluid pump 1 of the present embodiment, the heat generated by the motor unit 3 and the driver unit 4 can be radiated through the motor housing 31, and the heat dissipation of the motor unit 3 can be improved.
Furthermore, creep deformation of the cylindrical partition wall portion 35b that receives the contact force of the seal ring S under a thermal environment can be suppressed by the band member B1, and the waterproof property by the seal ring S is ensured, so that the fluid from the motor unit 3 Leakage can be prevented.

[Another embodiment]
Other embodiments will be described below.

<1> The fluid pump 1 is not limited to the water pump for circulating the engine coolant described in the previous embodiment, and may be used for applications other than for vehicles. Therefore, the fluid is not limited to cooling water.
Moreover, the structure of the pump part 2, the motor part 3, and the driver part 4 can also be changed.
<2> The deformation suppression mechanism B is not limited to the band member B1 described in the previous embodiment. For example, as shown in FIG. 2, the motor housing 31 in which the seal ring S is installed and the tubular shape In the cylindrical fitting part K with the partition wall part 35b, it may be configured by a cylindrical part B2 provided in a protruding state from the motor housing 31 to the outer peripheral surface of the cylindrical partition wall part 35b.
According to this embodiment, in the cylindrical fitting portion K, the diameter of the cylindrical partition wall portion 35b is increased by the cylindrical portion B2 of the motor housing 31 from the outer peripheral side of the cylindrical partition wall portion 35b that is externally fitted to the motor housing 31. The deformation in the direction can be suppressed, and the creep deformation of the cylindrical partition wall 35b in the cylindrical fitting portion K can be reliably suppressed while having a simple structure. Moreover, since the creep deformation of the cylindrical partition wall portion 25b can be suppressed only by the cylindrical portion B2 of the motor housing 31 without using a separate member, the number of components is reduced, and the component management and the cylindrical fitting portion K are reduced. The labor of the fitting operation can be reduced, and the material cost can be reduced.
<3> The deformation suppressing mechanism B is not limited to the one arranged on the outer peripheral side of the one end portion 35c of the stator housing 35 described in the previous embodiment. For example, as shown in FIG. You may arrange | position to the outer peripheral side of the part 35a. In this embodiment, a seal ring S is disposed between the motor housing 31 on one side of the flange portion 35a, the other side of the flange portion 35a faces the impeller chamber 21c, and the deformation suppressing mechanism B is composed of a ring-shaped iron plate B3 bonded to the other surface of the flange portion 35a. The iron plate B3 suppresses creep deformation (bending deformation) of the flange portion 35a.

  In addition, as mentioned above, although the code | symbol was written in order to make contrast with drawing convenient, this invention is not limited to the structure of an accompanying drawing by this entry. In addition, it goes without saying that the present invention can be carried out in various modes without departing from the gist of the present invention.

2 Pump part 3 Motor part 31 Motor housing 32 Stator 35b Cylindrical partition part 36 Rotor 39 Detour B Deformation suppression mechanism B1 Band member B2 Cylindrical part K Cylindrical fitting part S Seal ring

Claims (3)

A pump section;
A motor unit that includes a fixed stator and a rotor that is rotatably disposed on an inner peripheral side of the stator and drives the pump unit;
A motor housing that houses at least the motor section;
A cylindrical partition made of synthetic resin that fits into the motor housing and blocks between the stator and the rotor;
A detour that bypasses a part of the fluid flowing through the pump part to the inner space of the cylindrical partition part for cooling;
A seal ring provided between the fitting surfaces of the cylindrical partition wall and the motor housing;
The motor housing is made of a material having higher heat resistance than the cylindrical partition wall,
The fluid pump provided with the deformation | transformation suppression mechanism which suppresses the creep deformation | transformation of the said cylindrical partition part by the contact force of the said seal ring.   The said deformation | transformation suppression mechanism is comprised with the band member with which the cylindrical fitting part of the said cylindrical partition part was prepared in the cylindrical fitting part of the said motor housing which installed the said seal ring, and the said cylindrical partition part. Item 2. The fluid pump according to Item 1.   The deformation suppression mechanism is a cylinder provided in a protruding state from the motor housing to the outer peripheral surface of the cylindrical partition wall in a cylindrical fitting portion between the motor housing on which the seal ring is installed and the cylindrical partition wall. The fluid pump according to claim 1, wherein the fluid pump is configured by a shape portion.

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