JP5339129B2 - Electric pump - Google Patents

Description

  The present invention is connected to a rotating shaft member, and operates a pump unit provided on one side of the rotating shaft member in the axial direction and a motor unit provided on the other side of the rotating shaft member in the axial direction. A driver unit; a motor unit connected to the rotating shaft member; provided between the pump unit and the driver unit and having a motor rotor; and a case for housing the pump unit, the driver unit, and the motor unit. It is related with the electric pump provided with.

  Conventionally, as an electric pump of this type, as shown in FIG. 5, a partition wall 40 that cuts off the motor unit 20 and the driver unit 30 is provided in a hollow portion at the end of the stator 22 formed in the motor unit 20 in a cylindrical shape. There was what was formed in the state which got into a part (for example, refer to patent documents 1). This electric pump has a feature that the entire motor can be reduced in size because the motor unit 20 and the driver unit 30 partially wrap in the axial direction of the rotary shaft member 14.

JP 2004-353536 A (FIG. 1)

  According to the above-described conventional electric pump, although the driver unit is brought closer to the motor unit by devising the shape of the partition wall, the size of the entire motor is reduced, but the driver unit and the motor unit Due to the mutual heat effects, the driver unit equipped with electronic components is likely to become high temperature, and there is a risk that it becomes unpreferable as an operating environment.

  Accordingly, an object of the present invention is to provide an electric pump capable of solving the above-described problems and reducing the temperature of the driver unit while reducing the size and forming a preferable operating environment.

A first characteristic configuration of the present invention is a pump unit connected to a rotating shaft member and provided in one of the axial directions of the rotating shaft member, and a driver provided in the other of the rotating shaft members in the axial direction A motor unit having a motor rotor, and a case for housing the pump unit, the driver unit, and the motor unit, the motor unit having a motor rotor connected to the rotary shaft member and provided between the pump unit and the driver unit. And the driver unit operates the motor unit, the motor rotor and the driver unit are located in the same internal space inside the case, and the rotating shaft member is disposed on the driver unit side of the motor rotor. wherein Ri near where stirring blades is provided for stirring the fluid in the interior space, said stirring blade, song folding a portion of the laminated steel plates constituting the rotor to the driver side by rotation of the Near it was formed Te Ru.

According to feature structure of the present invention, between the motor unit and the driver unit, by not providing the conventional barrier rib, it is possible to close more cross, miniaturization as a whole electric pump, further promoting can do.
In addition, since the fluid in the internal space where the motor rotor and the driver unit are located together is agitated by the agitating blade, a fluid layer area having a high temperature is formed on the component surface of the driver unit. This can be prevented by forced stirring, and the temperature energy at the local part of the driver part is diffused throughout the internal space, so that the temperature of the driver part can be lowered. As a result, a preferable operating environment of the driver unit can be maintained.
On the other hand, since the driving of the stirring blade itself is performed by the rotation of the rotating shaft member that is operated by driving of the motor unit, it can be operated without preparing a dedicated driving mechanism, which increases the cost of equipment. It is possible to achieve a reduction in operating cost while suppressing this.
Further, in addition to the function of stirring the fluid in the internal space, heat can easily escape to the yoke through the stirring blade, and the internal space can be cooled more efficiently.
Furthermore, since the stirring blade is configured using laminated steel plates that are components of the motor rotor, the cost can be reduced by sharing the components.

FEATURES configuration of the present invention is in the internal space there is air, the stirring blade is in place to cool the driver portion and the air is agitated by rotation.

According to the above characteristic configuration, when the fluid moves in the internal space and exerts a cooling action, the air in the internal space has a low flow resistance, so that the rotational load of the stirring blade is increased. This can be prevented, and can be rotated with low power.

FEATURES configuration of the present invention, in the internal space there is hydraulic fluid, wherein the stirring blade is in place to cool the driver portion and the working oil is agitated by rotation.

According to said characteristic structure, in addition to the heat removal effect of the driver part by hydraulic fluid, the lubrication effect of a rotating shaft member and a bearing can also be achieved.

FEATURES configuration of the present invention, the motor rotor is in place are constituted integrally provided on the permanent magnet on the outer circumferential surface of the yoke made of a ferromagnetic material.

According to said characteristic structure, since the structure of a motor rotor is simple and manufacturing effort does not start, it becomes possible to hold down formation cost.

FEATURES configuration of the present invention, the motor rotor is in place are constituted elaborate buried permanent magnets in a plurality of laminated steel plates.

According to said characteristic structure, since reluctance torque generate | occur | produces, it is easy to obtain a big torque.

  Embodiments of the present invention will be described below with reference to the drawings. In the drawings, the parts indicated by the same reference numerals as those in the conventional example indicate the same or corresponding parts.

1 and 2 show an embodiment of the electric pump according to the present invention. The electric pump P is connected to the rotary shaft member 14 and is provided on one side of the rotary shaft member 14 in the axial direction. The pump unit 10, the driver unit 30 provided on the other side in the axial direction of the rotary shaft member 14, and the pump unit 10 connected to the rotary shaft member 14 and provided between the pump unit 10 and the driver unit 30. The motor unit 20 having the motor rotor 23, and the case K for housing the pump unit 10, the driver unit 30, and the motor unit 20 are provided.
Further, the driver unit 30 operates the motor unit 20, and the motor rotor 23 and the driver unit 30 are located in the same internal space V inside the case K, and the part of the motor rotor 23 on the driver unit 30 side. Further, a stirring blade F for stirring air (an example of fluid) R in the internal space V by the rotation of the rotary shaft member 14 is provided.

The pump unit 10 has a casing with a pump body 11 having a circular housing recess 11a formed on one end surface, and an end surface of the pump body 11 on which the housing recess 11a is formed via an annular seal member S1. A pump cover 12 that closes the cover is provided.
The pump body 11 is formed with a bearing hole 11b that is eccentric with the housing recess 11a.
In the housing recess 11a, a trochoid pump 13 comprising an outer toothed inner rotor 13a and an inner toothed outer rotor 13b meshing therewith is provided.
The outer surface of the outer rotor 13b is rotatably supported by the housing recess 11a, and the inner rotor 13a is fixed to one end of the rotating shaft member 14 rotatably supported by the bearing hole 11b on the same axis.

A large number of pump working chambers 13c whose volume increases and decreases with rotation are formed between the teeth of the rotors 13a and 13b that mesh with each other. A suction chamber 15 is formed on the inner surface of the pump cover 12 and the bottom surface of the storage recess 11a on both sides of the pump working chamber 13c along the range in which the volume of the pump working chamber 13c increases, while the pump working chamber 13c The discharge chamber 16 is formed along the range in which the volume of the gas decreases. The pump cover 12 is formed with a suction port 15 a communicating with the suction chamber 15 and a discharge port 16 a communicating with the discharge chamber 16.
As the rotary shaft member 14 rotates, the oil to be fed is sucked into the suction chamber 15 from the suction port 15a and fed to the discharge port 16a from the pump operating chamber 13c via the discharge chamber 16. Can do.

  An oil seal S2 is fitted in the bearing hole 11b of the pump body 11 in a liquid-tight manner, and the tip of the lip of the oil seal S2 is slidably brought into liquid-tight contact with the outer peripheral surface of the rotary shaft member 14. The oil seal S2 prevents oil from the pump unit 10 from leaking to the motor unit 20 side.

The motor unit 20 is a surface-magnet sensorless brushless DC motor including an annular stator 22 integrally provided in a cylindrical motor housing 21 and a motor rotor 23 positioned with a slight gap therebetween. It is configured.
The stator 22 includes a core 22a of a laminated iron plate and a coil 22b wound around a coil support frame 22c, and is integrally molded in a resin motor housing 21.
The motor rotor 23 has a permanent magnet 23b integrally fixed to the outer periphery of a cylindrical back yoke 23a, and the back yoke is connected to the other end of the rotary shaft member 14 with the inner rotor 13a press-fixed to one end. 23a is fixed on the same axis. Incidentally, the back yoke 23a is formed of a ferromagnetic material.
The stirring blade F is integrally provided at a portion of the motor rotor 23 on the driver portion 30 side (in the present embodiment, an end surface on the driver portion 30 side of the back yoke 23a). As shown in the drawing, the stirring blade F is composed of a plurality of rectangular plates positioned on the radiation from the central portion to the outer periphery in a plan view of the back yoke 23a, and is spaced apart in the circumferential direction of the back yoke 23a. Is provided.

The motor housing 21 is integrally connected with the pump cover 12 so that the entire circumference of the end of the cylindrical pump portion 10 is brought into contact with the pump body 11.
Further, a substrate 31 and a cover 32 of the driver unit 30 are attached to the end on the driver unit 30 side.
An annular seal member S3 is interposed between the motor housing 21 and the pump body 11 and between the motor housing 21 and the cover 32 to maintain a liquid-tight state.
The case K is configured by the pump cover 12, the pump body 11, the motor housing 21, and the cover 32.
Therefore, the space inside the motor housing 21 is configured as a sealed space, and the motor rotor 23 and the driver unit 30 coexist in the internal space V.

Incidentally, the driver unit 30 has a large number of components 31a, 31b, and 31c attached to the substrate 31, and each component is arranged facing the internal space V side.
When a current controlled by the driver unit 30 is applied to the coil 22b of the stator 22 of the sensorless brushless DC motor, a rotating magnetic field is generated, and the motor rotor 23 rotates. Along with the rotation, the trochoid pump 13 is rotationally driven through the rotating shaft member 14.

Further, as the motor rotor 23 rotates, the stirring blade F also rotates around the axis of the rotating shaft member 14 to stir the air in the internal space V.
As a result, the formation of a high-temperature air layer area on the component surface of the driver unit 30 can be prevented by the forced stirring effect of the stirring blade F. Therefore, the temperature of the driver unit 30 can be lowered by diffusing the temperature energy in the local portion of the driver unit 30 throughout the internal space V.
As a result, a preferable operating environment of the driver unit 30 can be maintained.
On the other hand, since the stirring blade F is driven by driving the motor unit 20, it can be operated without preparing a dedicated driving mechanism, and can be operated in a state where cost increase as equipment is suppressed. It is possible to achieve a reduction in cost.

[Another embodiment]
Other embodiments will be described below.

<1> The electric pump P is not limited to the surface magnet type as described in the previous embodiment. For example, the electric pump P may be an embedded magnet type as shown in FIGS. 3 and 4. .
In the electric pump P according to this embodiment, the configuration of the motor rotor 23 is different from that of the previous embodiment, and a permanent magnet 23b is embedded in a plurality of laminated steel plates 23c.
According to this electric pump P, since reluctance torque is generated, a large torque is easily obtained.
<2> The stirring blade F is not limited to that described in the previous embodiment. For example, as shown in FIGS. 3 and 4, a part of the laminated steel plate 23 c constituting the motor rotor 23 is used as the driver. You may bend | fold and form in the part 30 side.
According to this embodiment, the stirring blade F is configured using the laminated steel plate 23c, which is a component part of the motor rotor 23. Therefore, the cost can be reduced by sharing the parts. Further, heat can be easily escaped to the motor rotor 23 through the stirring blade F, and the internal space V can be cooled more efficiently.
<3> In the internal space V, only air is present as the fluid R described in the previous embodiment. However, the present invention is not limited to this. For example, a liquid such as hydraulic oil or cooling water or a mixture of hydraulic oil and air may be used, and these are collectively referred to as a fluid.
<4> In addition, although the electric pump P of this embodiment illustrated the case where the pump part 10 was comprised with the trochoid pump 13, the pump part 10 may be comprised with the impeller, and it depends on the kind of pump part 10. It is not limited.

  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.

Plan view explanatory drawing of an electric pump Side view of electric pump Plan view explanatory drawing of the electric pump of another embodiment Side view sectional drawing of the electric pump of another embodiment Side view sectional view of a conventional electric pump

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Pump part 14 Rotating shaft member 20 Motor part 23 Motor rotor 23a Back yoke 23b Permanent magnet 23c Laminated steel plate 30 Driver part F Stirring blade K Case R Fluid (air)
V Internal space

Claims (5)

A pump unit connected to the rotary shaft member and provided on one of the axial directions of the rotary shaft member;
A driver portion provided on the other side in the axial direction of the rotating shaft member;
A motor unit connected to the rotary shaft member, provided between the pump unit and the driver unit, and having a motor rotor;
A case for housing the pump unit, the driver unit, and the motor unit;
The driver unit operates the motor unit,
The motor rotor and the driver part are located in the same internal space inside the case, and a stirring blade that stirs the fluid in the internal space by the rotation of the rotary shaft member at a part on the driver part side of the motor rotor. Ri Oh provided,
The stirring blade is an electric pump formed by bending a part of a laminated steel plate constituting the motor rotor toward the driver portion . Electric pump according to claim 1, wherein the inner space there is air, the stirring blades to cool the driver portion and the air is agitated by rotation. 3. The electric pump according to claim 1, wherein hydraulic oil is present in the internal space, and the hydraulic oil is agitated and the driver unit is cooled by rotation of the stirring blade. The motor rotor, the electric pump according to any one of claim 1 to 3, are configured by providing integrally with the permanent magnet on the outer circumferential surface of the yoke made of a ferromagnetic material. The electric pump according to any one of claims 1 to 4, wherein the motor rotor is configured by embedding permanent magnets in a plurality of laminated steel plates.

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