JPH11343989A - Motor pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance the concentricity of a motor rotor and allow shortening the overall length of a motor. SOLUTION: A motor pump 10 is composed of a stator 6, a rotor 5 installed inside of the stator 6, a rotary shaft 1 installed inside the rotor 5 in such a way as rotatable in a single piece with the rotor 5 and fitted with an impeller 2, and a stator supporting part 4b to support the stator 6 by its inside. A housing 4 is fitted with a slide bearing part 3 capable of relative rotation with the rotary shaft 1 inside the shaft 1 and longer axially than the inside surface of the rotary shaft 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor pump for discharging a fluid by rotating an impeller by the driving force of a motor.

[0002]

2. Description of the Related Art Conventionally, there has been known a motor pump which discharges fluid by rotating an impeller by driving a motor with a water pump or the like. Such a water pump is generally used to circulate cooling water between an engine and a radiator of a vehicle.An impeller is disposed at an end of a rotor having bearings on both sides, and the rotor is connected to the water pump. By rotating, the impeller is rotated to discharge the fluid.

[0003]

However, in the above prior art, since the bearings are separately provided on both sides of the rotor of the motor, the coaxiality of the motor rotor is hardly obtained. Further, there is a problem that the total length of the motor becomes longer because two bearings are required.

[0004] Therefore, an object of the present invention is to provide a motor pump capable of improving the coaxiality of a rotor of a motor and reducing the overall length of the motor in order to solve the above problems. .

[0005]

Means for Solving the Problems To solve the above problems, the invention of claim 1 comprises a stator, a rotor disposed on the inner peripheral side of the stator, and a rotor arranged on the inner peripheral side of the rotor. A rotating shaft disposed so as to be integrally rotatable with the stator, and a sliding bearing portion having a stator supporting portion for supporting the stator on the inner peripheral side of the stator and being rotatable relative to the rotating shaft on the inner peripheral side of the rotating shaft. And a housing having:

According to the first aspect, since there is no bearing for supporting the rotor at both ends of the rotor, the overall length of the motor can be reduced.

A second aspect of the present invention is that, in the first aspect, the axial length of the sliding bearing portion of the housing is longer than the inner peripheral side of the rotary shaft.

According to the second aspect, since the rotating shaft is supported by the slide bearing having a shaft length longer than the inner circumference of the rotating shaft, the coaxiality of the rotor is easily obtained.

According to a third aspect of the present invention, in the first or second aspect, the sliding bearing portion of the housing is formed of a material having a smaller sliding resistance than the stator supporting portion.

According to the third aspect, the sliding bearing has a smaller sliding resistance than other parts of the housing, so that the resistance to the rotation of the rotor is reduced and the efficiency is improved, and the rotation of the motor is smoothed.

The invention according to claim 4 is the invention according to claims 1 to 3
In the above, the rotating shaft is formed of metal, and the relative rotating portion of the housing is formed of resin.

According to the fourth aspect, when the stator is excited, the metal rotary shaft is attracted by the magnetic force of the stator. With this suction force, the displacement of the rotating shaft with respect to the sliding bearing portion of the housing in the thrust direction can be minimized.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view of a motor pump 10 according to the first embodiment. In the present embodiment, a case is shown in which a motor pump 10 is used as a drive source of a water pump for circulating cooling water.

The motor pump 10 is provided with a stator 6, a rotor 5 disposed on the inner peripheral side of the stator 6, and an inner peripheral side of the rotor 5 so as to be integrally rotatable with the rotor 5. A rotating shaft 1 having an impeller 2 and a stator supporting portion 4b for supporting the stator 6 on the inner peripheral side of the stator 6 and rotatable relative to the rotating shaft 1 on the inner peripheral side of the rotating shaft 1. A housing 4 having a sliding bearing portion 3 whose axial length is longer than the inner peripheral side of the shaft 1;
Is provided. When an electric current flows through the stator 6, the rotation shaft 1 is driven to rotate integrally with the rotor 5, and the rotation of the impeller 2 causes the fluid in the rear part 7 to flow from between the impeller 2 and the housing 4. Discharge.

Here, the rotating shaft 1 is formed of metal, and the sliding bearing portion 3 fixed to the housing 4 is formed of a synthetic resin material having a smaller sliding resistance than the stator supporting portion 4b. Therefore, the rotating shaft 1 rotates smoothly. Further, when the stator 6 is excited, the rotating shaft 1 made of metal is attracted in the thrust direction, so that the rotating shaft 1 does not shift in the axial direction with respect to the sliding bearing portion 3.

FIG. 2 is a sectional view showing a motor pump 20 according to a second embodiment of the present invention. The second embodiment differs from the first embodiment in that a through hole 21a for introducing cooling water as a lubricant between the rotating shaft 21 and the slide bearing 3 is provided in the rotating shaft 21. It is. Through hole 21
By providing a, the lubrication between the rotating shaft 21 and the slide bearing 3 is improved, and the rotation of the impeller 2 becomes smooth. The other configuration is the same as that of the first embodiment, and the description is omitted. The same components as those in the first embodiment are denoted by the same reference numerals.

FIG. 3 is a sectional view showing a motor pump 30 according to a third embodiment of the present invention. The third embodiment is different from the above-described second embodiment in that the rotating shaft 21
Is made of resin and fitted to the tip of the rotating shaft 21. With this configuration, the impeller 32
Is lightened, and the rotation efficiency at the time of starting rotation of the motor pump 30 is improved. The other configuration is the same as that of the second embodiment, and the description is omitted. The same components as those in the first embodiment are denoted by the same reference numerals.

FIG. 4 is a sectional view showing a motor pump 40 according to a fourth embodiment of the present invention. The fourth embodiment is different from the first embodiment in that the rotating shaft 41
And the impeller 42 are integrally formed of the same material, and a through hole 41a for introducing cooling water as a lubricant between the rotating shaft 41 and the sliding bearing portion 3 is provided at the center of the rotating shaft 41. is there. Another difference is that the stator 6 is molded so that the stator 6 is disposed in the stator support portion 44b when the housing 44 is formed. The other configuration is the same as that of the first embodiment, and the description is omitted. The same components as those in the first embodiment are denoted by the same reference numerals.

As described above, the embodiments of the present invention have been described with reference to the drawings. However, the present invention is not limited to the above-described embodiments, but may be any other form that conforms to the gist of the present invention. Such a motor pump may be used.

[0020]

According to the first aspect, since no bearing is provided for supporting both ends of the rotor, the overall length of the motor can be reduced.

According to the second aspect, since the rotating shaft is supported by the relative rotating portion of the housing, the coaxiality of the rotor is easily obtained.

According to the third aspect, since the sliding bearing has a smaller sliding resistance than the relative rotating portion, the resistance to the rotation of the rotor is reduced, so that the efficiency is improved and the rotation of the motor becomes smooth.

According to the fourth aspect, when the stator is excited, the rotating shaft made of metal is attracted by the magnetic force of the stator. With this suction force, the displacement of the rotating shaft with respect to the sliding bearing portion of the housing in the thrust direction can be minimized.

[Brief description of the drawings]

FIG. 1 is a sectional view of a motor pump according to a first embodiment of the present invention.

FIG. 2 is a sectional view of a motor pump according to a second embodiment of the present invention.

FIG. 3 is a sectional view of a motor pump according to a third embodiment of the present invention.

FIG. 4 is a sectional view of a motor pump according to a fourth embodiment of the present invention.

[Explanation of symbols]

 1, 21, 41: Rotating shaft 2, 32, 42: Impeller 3: Sliding bearing part 4, 44: Housing 5: Rotor 6: Stator 7: Back part 10, 20, 30, 40 ... motor pump

Claims (4)

[Claims] 1. A rotor having a stator, a rotor disposed on an inner peripheral side of the stator, and a rotor having an impeller disposed on the inner peripheral side of the rotor so as to be integrally rotatable with the rotor. A shaft, having a stator support portion for supporting the stator on the inner peripheral side of the stator, and being rotatable relative to the rotating shaft on the inner peripheral side of the rotating shaft and having an axial length greater than the inner peripheral side of the rotating shaft. A housing having a long plain bearing. 2. The sliding bearing portion of the housing has a shaft length longer than an inner peripheral side of the rotating shaft.
1 motor pump. 3. The motor pump according to claim 1, wherein the sliding bearing portion of the housing is formed of a material having a smaller sliding resistance than the stator supporting portion. 4. The motor pump according to claim 1, wherein the rotating shaft is made of metal, and the sliding bearing portion is made of resin.