JPH10220386A - Stator for canned motor pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate a process to join a stator, a can, and a pump casing and to suppress the occurrence of vibration by a method wherein the stator of a canned motor pump is embedded and held in the outer peripheral surface of a can cylinder molded by using resin such that a rotor chamber and a pump chamber are integrally formed. SOLUTION: A canned motor pump is provided with a can 4-1 formed such that a casing 3, a vibration circuit 2, and the stator 1-1 of a motor 1 are molded in an embedded state. A resin molding part 4 being of a type where a pump casing 7-2 is integrally formed, a rotor 1-2 coupled integrally with an impeller 7-1, a partition plate 7-3, and a pump cover 7-4 are axially coupled together. Namely, a drive circuit part 2 and the stator 1-1 are integrally molded in an embedded state, and the cylinder part of the can 4-1 is formed by a resin mold part 4. A resin layer is formed on the inner peripheral surface of the embedding stator 1-1, which forms the cylinder part of the can 1 and a rotor shaft 1-3 is integrally molded and held at the central part of the bottom of the cylinder part of the can 4-1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stator structure for a canned motor pump.

[0002]

2. Description of the Related Art FIG. 3 is a schematic sectional view of an example of a canned motor pump. A can 6 for forming a rotor chamber together with a motor 1 and a drive circuit 2 is provided inside a housing 3, and a cylindrical portion of the can 6 is provided. At 6-1 the stator 1-1 and the rotor 1-2 are isolated.

The can 6 is formed integrally with a pump casing 7-2 forming a pump chamber so as to extend from the open end of the cylindrical portion 6-1 forming the rotor chamber. 1 is connected to the rotor 1-2 and is rotatably supported.

[0004] The stator 1-1 of the motor 1 is fixed to the outer peripheral surface of the cylindrical portion 6-1 of the can 6 by means of press-fitting or bonding or the like. It is configured to be housed in

[0005]

In the above-described conventional configuration, the can 6 and the stator 1-1 are separately connected, so that the cost of the fixing man-hour and the reliability in the operation are reduced. There has been a demand for a solution such as derivation of vibrations due to insufficient fixing and holding force.

[0006]

The stator of the canned motor pump according to the present invention is buried and held on the outer peripheral surface of a can cylindrical portion formed by resin molding so that the rotor chamber and the pump chamber are integrated. A part of a resin molded part forming a rotor chamber on the peripheral surface forms a cylindrical part of a partition wall that separates the stator and the rotor, or a stainless steel cylindrical member is provided on an inner peripheral surface thereof, The stainless steel cylindrical portion is configured to form the cylindrical portion of the partition wall, and the rotor shaft extending in the axial direction around the rotor chamber is also integrally formed and held at the center of the rotor chamber bottom, or a drive for driving the motor. The circuit section is also configured to be integrally buried.

In the above configuration, the stator of the motor and the drive circuit for driving the motor are also buried and held integrally with the can molding, so that the joining step can be eliminated and the generation of vibration can be suppressed. it can.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a combination diagram for explaining an embodiment according to the present invention.
A resin molded part 4 in which a can 4-1 in which the stator 1-1 is embedded and molded and a pump casing (7-2) are integrated;
The rotor 1-2, the partition plate 7-3, and the pump cover 7-4 that are integrally connected to the impeller 7-1 are axially connected.

As is apparent from comparison with FIG. 3 showing the configuration of the prior art described above, the conventional configuration is different from the motor 1 and the drive circuit 2
1, except that the drive circuit unit 2 and the stator 1-1 are integrally buried and molded, and the resin molding unit 4 is integrated with the pump casing (7-2), as shown in FIG. But,
The subject of the present application is to form a cylindrical portion 4-1 of a can that separates the stator 1-1 and the rotor 1-2 of the motor 1.

[0010] A resin layer is formed on the inner peripheral surface of the stator 1-1 to be embedded, and this constitutes a can cylindrical portion 4-1. Further, a rotor shaft 1-3 for supporting the rotor 1-2 may be integrally molded and held at the center of the bottom surface of the cylindrical portion 4-1 of the can forming the rotor chamber.

FIG. 2 shows another embodiment, in which a stainless steel cylindrical member 6 forming a can on the inner peripheral surface of the stator 1-1 is shown.
The drive circuit unit 2 and the stator 1-1 are embedded and molded, and the pump casing (7-2) and the stainless steel cylindrical member 6 are integrally formed to form the resin molded unit 5. The rotor shaft 3-1 is integrally fixed and held at the center of the bottom of the resin molded portion 5.

Although the above detailed description shows an example of a self-priming canned motor pump, it goes without saying that this can be applied to a non-self-priming pump.

[0013]

According to the stator of the canned motor pump according to the present invention, the drive circuit for driving the motor and the stator of the motor are embedded and molded, and the pump casing is integrally resin-molded together with the can. In addition to eliminating the step of joining the stator, the can and the pump casing, there is also an effect of suppressing generation of vibration.

[Brief description of the drawings]

FIG. 1 is a combination diagram illustrating an embodiment according to the present invention.

FIG. 2 is a sectional view of a main part of another example according to the present invention.

FIG. 3 is a sectional view of a canned motor pump according to a prior art example according to the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Motor 1-1 Stator 1-2 Rotor 1-3 Rotor shaft 2 Drive circuit part 3 Housing 4 Resin molding part which embeds and holds a drive circuit part and a stator, and integrally forms a can and a pump casing 4- Reference Signs List 1 Can cylinder part 5 Resin molding part which embeds drive circuit part and stator and integrally forms pump casing together with stainless steel cylinder member forming can 6 Stainless steel cylinder member forming can cylinder part 6-1 Can cylinder Part 7 Pump 7-1 Impeller 7-2 Pump casing 7.3 Partition plate 7-4 Pump cover

Claims (5)

[Claims] 1. A rotating machine comprising a stator, a rotor, and a partition separating the stator and the rotor to form a rotor chamber, an impeller connected to the rotor and rotating, and a pump chamber accommodating the impeller. Wherein the stator is embedded and held on the outer peripheral surface of the rotor chamber of a resin molded part in which the rotor chamber and the pump chamber are integrated. Characteristic stator of canned motor pump. 2. The stator of the canned motor pump,
2. A part of a resin molding part forming the rotor chamber on an inner peripheral surface thereof forms a cylindrical part of a partition wall separating the stator from the rotor. Stator of canned motor pump. 3. The stator of the canned motor pump,
2. The stator for a canned motor pump according to claim 1, wherein a stainless steel cylindrical member is provided on an inner peripheral surface thereof, and the stainless steel cylindrical portion forms a cylindrical portion of a partition wall. 4. The stator of the canned motor pump,
The canned motor pump according to any one of claims 1 to 3, wherein the rotor shaft is formed so as to integrally hold a rotor shaft extending in the axial direction about the rotor chamber at the center of the bottom of the rotor chamber. Child. 5. The stator of the canned motor pump,
The stator for a canned motor pump according to any one of claims 1 to 4, wherein the stator is formed integrally with the drive circuit unit for driving the motor.