JP2002339891A - Electric pump - Google Patents

Abstract

(57) [Problem] To provide an electric pump that can reduce flow path resistance and has a long life by eliminating bearings in flow paths of a fluid suction port and a discharge port. A frame has a stator and a rotor.
The rotor 11 has a magnetic body 15 on the outer periphery and a plurality of blades 16 on the inner periphery, and the rotor 11 The outer peripheral portion is rotatably held by the frame or the stator 12 via the bearing 20.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric pump for forming a fluid flow path inside a motor, for example.

[0002]

2. Description of the Related Art An example of a conventional electric pump will be described with reference to a cross sectional view shown in FIG. This electric pump is an axial flow type pump in which a rotating shaft of a motor to which an impeller is mounted is rotated to suck fluid from one suction port and discharge from another axial discharge port.

[0003] A conventional electric pump 31 includes a casing 32.
A stator 33 and a rotor 34 are housed therein. A fluid inlet 35 is provided at one of the two ends of the casing 32.
And a discharge port 36 on the other side, and a pair of bearings 37, 37 are provided at the center thereof.

[0004] An impeller 39 is attached to the rotating shaft 38.
A rotor 34 is provided on the outer peripheral portion of the impeller 39 via a blade 40.
Has been fixed. The rotating shaft 38 includes a pair of C rings 4
1 and 41 are fitted into the grooves of the rotating shaft 38 and are rotatably supported by respective bearings 37 and 37.

[0005] From the above configuration, the rotor 34 is fixed to the stator 33.
The fluid sucked from the suction port 35 in the direction of the arrow in the figure is discharged from the discharge port 36 in the direction of the arrow by the impeller 39 integrally connected to the rotor 34 in accordance with the rotation by the electromagnetic force generated in .

[0006]

However, in the conventional electric pump, the bearings 37, 37 are located at the center of the fluid flow path. The bearing narrows the flow path and limits the size of the bearing. Reducing the size of the bearing reduces its life. In addition, since the suction port 35 and the discharge port 36 are divided by the pillar holding the bearing, the area is reduced. Also,
Vortices are easily generated and the flow path resistance is increased. Therefore, the bearing reduces the life of the electric pump. Further, since the flow resistance of the fluid is large, the suction efficiency of the pump is lowered, which is not preferable.

In order to solve the above-mentioned problems, the invention described in each of the claims eliminates the bearing in the fluid flow path, thereby reducing the flow path resistance and providing a long-life electric pump. The purpose is to provide.

[0008]

According to the present invention, in order to solve the above-mentioned problems, according to the first aspect of the present invention, a flow path is formed inside a motor in which a stator and a rotor are housed in a frame. In the electric pump, the rotor has a magnetic body on an outer peripheral portion and a plurality of blades on an inner peripheral portion, and the rotor has an outer peripheral portion rotatably held on the frame or the stator via a bearing. It is characterized by having been done.

According to a second aspect of the present invention, in the electric pump according to the first aspect, the bearing is provided at both ends of an outer peripheral portion of the rotor, and the magnetic body is arranged between the bearings. I do.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a cross-sectional view showing an electric pump according to the present embodiment, and FIG.

As shown in FIGS. 1 and 2, the motor 10 of the electric pump includes a rotor 11, a stator 12,
And 3.

The rotor 11 includes a rotor core 14, a magnet 15, and a plurality of blades 16. The rotor core 14 is filled with and held by a magnet 15 which is a magnetic material of a ferromagnetic material. The rotor core 14 is made of a magnetic material. As shown in FIG. 2, the magnet 15 is magnetized so that two pairs of S poles and N poles are alternately arranged in the circumferential direction, forming a so-called four poles. Further, a plurality of blades 16 are formed on the inner peripheral portion.

The stator 12 includes a stacked stator core 17 and a stator winding 18 wound around the stator core 17.
It is composed of There are a total of six stator windings 18, and those on diagonal lines are connected in series to form three sets of windings, which are connected in three phases. The stator 12 is molded 19 with a resin such as polyester in order to prevent a fluid such as water from entering the inside thereof. Further, the outer periphery of the stator 12 is covered with an aluminum frame 13.

If the switching of the excitation phase of the stator winding 18 is reversed, the blades 16
Can be rotated in the reverse direction, whereby forward and reverse rotation operations can be easily performed.

Reference numeral 20 denotes a pair of bearings to be used in water. The rotor 11 is rotatably held by 20. An oil seal 21 is provided outside the bearings 20 and 20.
21 are provided. The sleeve bearing 20
Is, for example, POM (Polyoxymethyln)
e) Resin, PPS (Polypropylenesty)
ene) Those made of resin or the like are used.

The blade 16 has a cylindrical warhead 22 at the axial center of the rotor 11, and is formed radially on the outer periphery of the warhead 22 and on the inner periphery of the rotor 11 to apply a centrifugal force to the fluid. And an axial flow type or a mixed flow type having four blades 16. Further, the blade 16 has a planar shape with a two-dimensional inclination at the center in the axial direction.

That is, the blade 16 facing the warhead 22
Are arranged and formed symmetrically in the axial and radial directions.

The frame 13 facing the warheads 22
A suction port 23 for sucking fluid is provided at one of the openings, and a discharge port 24 for discharging fluid is provided at the other.

In such a configuration, when a current is supplied to the motor of the electric pump, a rotating magnetic field traveling in the circumferential direction is generated in the stator winding. The rotating magnetic field generated by the winding and each magnetic pole of the magnetic material held by the rotor are magnetically coupled. Due to this magnetic coupling, a rotating torque is generated in the rotor, and the rotor held by the bearing is turned, and at the same time, the blade held on the inner peripheral surface of the rotor is turned. Due to the rotation of the blades, water pressure is applied to a fluid such as water on the discharge port side in the flow path, and the fluid advances. Accordingly, the water pressure on the suction side of the rotor decreases, and the fluid on the suction side flows into the rotor section. By repeating this, the fluid is sent from the suction side to the discharge side to supply water.

Since the bearing 21 for rotatably holding the rotor 11 is not provided in the flow passage, the electric pump of the present invention does not obstruct the flow passage, and the bearing 21 is provided on the outer periphery of the rotor 11. Since it is provided, it can be manufactured freely.

The shape, number, angle, etc. of the blades of the electric pump may be determined as appropriate according to the size of the pump.

Further, since the blades are arranged symmetrically in the axial direction, the water supply and drainage can be easily performed by rotating the motor forward and backward.

The present invention is not limited to the above-described embodiments, but can be variously modified at the stage of implementation without departing from the scope of the invention. further,
The embodiment includes various stages of the invention,
Various inventions can be extracted by appropriately combining a plurality of disclosed components.

[0025]

As described above, according to the inventions described in the claims, no bearing is provided in the flow path of the fluid suction port and the discharge port, the flow path resistance can be reduced, and the electric pump has a long life. Can be obtained.

[Brief description of the drawings]

FIG. 1 is a transverse sectional view showing a structure of an electric pump according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a cross-sectional view showing the structure of a conventional electric pump.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Rotor 12 Stator 13 Frame 15 Magnetic body 16 Blade 20 Bearing

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3H022 BA03 BA06 CA11 CA19 CA20 CA50 CA56 DA00 DA07 DA19 DA20 3H033 AA01 AA11 BB01 BB08 BB13 CC05 CC06 DD29 DD30 EE08 EE09 EE14 EE17 EE19

Claims (2)

[Claims] 1. An electric pump in which a flow path is formed inside a motor in which a stator and a rotor are housed in a frame, wherein the rotor has a magnetic material on an outer peripheral portion and a plurality of blades on an inner peripheral portion. An electric pump, wherein the outer periphery of the rotor is rotatably held by the frame or the stator via a bearing. 2. The electric pump according to claim 1, wherein said bearings are provided at both ends of an outer peripheral portion of said rotor, and said magnetic material is arranged between said bearings.