JPH07111752A - Magnet pump - Google Patents

Abstract

PURPOSE:To form a stator can having a high pressure resistance without eddy current loss. CONSTITUTION:A magnet pump comprises DC motor formed of a cylindrical rotor 11 in which a permanent magnet 10 is embedded and a stator 9 provided on an outer periphery of the rotor 11, an impeller 15 fixed to one end of the rotor 11 in a direction of a rotary shaft in such a manner that the rotor 11 and the impeller 15 are contained in a casing 1, wherein a stator can 5 for partitioning the rotor 11 and a stator chamber 6 is formed of plastic or ceramics and an outer surface of a non-liquid contact part except the stator core is covered with metal or high strength material.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnet pump, and in particular, a rotor having a permanent magnet embedded therein is rotated by the action of an external magnetic field, and an impeller fixed to one end of the rotor is rotated to perform the pump action. The present invention relates to a magnet pump.

[0002]

2. Description of the Related Art As an example of a conventional magnet pump,
A magnet pump using a radial gap type magnetic coupling is shown in FIG. In FIG. 4, reference numeral 2
Reference numeral 1 denotes a casing, the casing 21 has a discharge port 42, and a suction casing 22 having a suction port 43 is attached to one side of the suction side. Further, on the other side of the casing 21, there is formed an axially extending cylindrical portion 21a for accommodating the rotor 23 in which the permanent magnet 33 is embedded.
A pump chamber 25 that rotatably accommodates the impeller 24 is formed in the casing 21, and the pump chamber 25 communicates with the interior of the casing cylindrical portion 21a that accommodates the rotor 23.

A stator 28 composed of an iron core 27 around which a coil 26 is wound is arranged on the outer periphery of the rotor 23 with a gap c therebetween, and the outside of the iron core 27 is sealed by a motor frame 29. The inner side of the iron core 27 is sealed by the casing cylindrical portion 21a and protected from liquid contact.

The rotor 23 and the impeller 24 are fixedly coupled to each other by a screw 30 that closes when the rotor rotates. In the drawing, reference numeral 34 is a main shaft, reference numeral 31 is a rotation side bearing attached to the rotor 23, and reference numeral 32 is shown.
Is a fixed bearing.

[0005]

In the conventional magnet pump having the above-described structure, if the casing cylindrical portion 21a is made of a metal material, an eddy current is generated and the loss is increased. Therefore, the casing is made of an insulator such as plastic. It is desirable to do. However, since the resin material such as plastic has low strength, there is a possibility that the iron core 27 may be deformed or damaged except for the outer peripheral portion thereof, and the discharge pressure of the pump cannot be increased.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a magnet pump capable of providing a stator can of high withstand voltage without eddy current loss.

[0007]

In order to achieve the above-mentioned object, the magnet pump of the present invention comprises a DC motor composed of a cylindrical rotor having a permanent magnet embedded therein and a stator provided on the outer periphery of the rotor. In a magnet pump in which an impeller is fixed to one end of the rotor in the rotation axis direction and the rotor and the impeller are housed in a casing, a stator can that separates the rotor and the stator chamber is made of plastic or ceramics and is not in contact. The outer surface of the liquid portion excluding the stator core portion is covered with a metal or a high-strength material.

[0008]

According to the present invention having the above-described structure, the stator can is made of plastic or ceramics, and the outer surface of the non-wetted part except the stator core is covered with metal or high strength material, so that eddy current loss is caused. It is possible to obtain a high withstand pressure stator can, and it is possible to increase the pump discharge pressure.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a magnet pump according to the present invention will be described below with reference to FIGS. FIG. 1 is a cross-sectional view showing the entire structure of a canned motor of the present invention. In FIG. 1, reference numeral 1 is a casing, and a casing 1 is formed with a discharge port 1a. An impeller 15 is housed in the casing 1, a suction casing 2 having a suction port 2a is attached to one side of the suction side of the casing 1, and a motor frame 3 is fixed to the other side. .
The motor frame 3 has a large number of fins 3a on its outer peripheral portion for improving cooling efficiency, and its opening is closed by a motor cover 4.

A stator can 5, which is made of plastic or ceramics and has a substantially cylindrical container shape, is inserted into the motor frame 3. The stator can 5, the motor cover 4, and the stator chamber 6 surrounded by the motor frame 3.
A stator 9 including an iron core 7 and a coil 8 is arranged inside. A rotor 11 having a permanent magnet 10 embedded therein is disposed inside the stator can 5, and the rotor 11 is fixed to and supported by a main shaft 12. An impeller 15 is fixed and supported on the other side of the main shaft 12. Spindle 1
The rotary side bearings 13 and 14 are provided on both sides of the fixed side bearing 1 to support the rotary side bearings 13 and 14.
6 and 17 are held by a holding member 18 fixed to the motor frame 3, respectively.

A thrust bearing 19 is provided at the suction port of the impeller 15, and the thrust bearing 19 comprises a fixed bearing 19a fixed to the casing 1 and a rotary bearing 19b fixed to the impeller 15. It is configured.

However, in this embodiment, as shown in detail in FIG. 2, a cylindrical metal or metal is provided between the motor frame 3 and one side of the iron core 7 on the outer peripheral portion of the stator can 5. The reinforcing pipe 35 made of high-strength material is provided, and the iron core 7
Between the other side and the motor cover 4, a reinforcing cover 36 made of metal or a high-strength material in a substantially cylindrical container shape is provided. Therefore, the reinforcement pipe 35 and the reinforcement cover 36 prevent the stator can 5 from being deformed, and when the internal pressure is applied to the stator can 5 by the pump operation,
When the stator can 5 is deformed,
The coil ends on both sides of the stator are prevented by the reinforcing pipe 35 and the reinforcing cover 36. The end surface of the reinforcing cover 36 is supported by the protrusion 4a of the motor cover 4, and deformation of the stator can 5 in the axial direction is prevented.

Since the permanent magnet 10 of the stator 9 and the rotor 11 constitutes a direct current motor as described above, a magnetic field is generated inside the iron core 7 in the rotation direction, and the permanent magnet 1
The rotor 11 in which 0 is embedded rotates in a predetermined direction, and the impeller 15 fixed to one end of the rotor 11 rotates, sucks the liquid from the suction port 2a of the suction casing 2, pressurizes it, and discharges it from the casing 1. A pump action for discharging from 1a is performed.

At this time, although the internal pressure is applied to the stator can 5, the stator can is prevented from being deformed by the stator 9 in the stator portion, and the stator can is prevented by the reinforcing pipes 35 and the reinforcing covers 36 at the coil end portions on both sides of the stator. Prevent deformation of 5.

FIG. 3 is a diagram showing another embodiment of the magnet pump of the present invention, and is a diagram corresponding to FIG. In the present embodiment, the cylindrical reinforcing tube 35 provided between one side of the iron core 7 and the motor frame 3 is inserted into the spigot portion provided in the stator portion (see the portion A), The substantially cylindrical container-shaped reinforcing cover 36 provided between the other side of the motor 7 and the motor cover 4 is inserted in the spigot portion provided in the stator portion (see section B). Therefore, according to this embodiment, the strength of the end surfaces of the reinforcing pipe 35 and the reinforcing cover 36 is increased, and the stator can 5 is prevented from being deformed.

[0016]

As described above, according to the present invention, the stator can is made of plastic or ceramics, and the outer surface of the non-wetted portion excluding the stator core is covered with metal or high strength material. A high withstand voltage stator can with no current loss can be obtained, and the pump discharge pressure can be increased.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an embodiment of a magnet pump according to the present invention.

FIG. 2 is a vertical sectional view showing a main part of a magnet pump according to the present invention.

FIG. 3 is a vertical cross-sectional view showing the main parts of another embodiment of the magnet pump according to the present invention.

FIG. 4 is a vertical sectional view of a conventional magnet pump.

[Explanation of symbols]

 1 Casing 3 Motor Frame 4 Motor Cover 5 Stator Can 6 Stator Chamber 7 Iron Core 8 Coil 9 Stator 10 Permanent Magnet 11 Rotor 12 Spindle 15 Impeller 35 Reinforcement Pipe 36 Reinforcement Cover

Claims (3)

[Claims] 1. A direct current motor is constituted by a cylindrical rotor having a permanent magnet embedded therein and a stator provided on the outer periphery of the rotor, and an impeller is fixed to one end of the rotor in the rotational axis direction, and the rotor and the blade are fixed. In a magnet pump in which a car is housed in a casing, the stator can that partitions the rotor and the stator chamber is made of plastic or ceramics, and the outer surface of the non-wetted part except the stator core is covered with metal or high-strength material. Characteristic magnet pump. 2. The magnet pump according to claim 1, wherein one end surface of the metal or the high strength material is inserted into a stator core portion. 3. An end surface of a member of the metal or high-strength material on the side opposite to the opening of the stator can is supported by a protrusion provided on the motor cover to prevent deformation of the stator can in the axial direction. The magnet pump according to claim 1 or 2.