JP2000295810A - Turbopump motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To seal terminal parts for supplying power to the motor of a canned motor pump securely. SOLUTION: A terminal block 38 has a linkage path through which the inside and outside of a stator enclosing vessel 34 are communicated. Terminals 46 are provided on the tip of the terminal block 38 so as to close the linkage path. The terminals 46 are pressed against the tip of the terminal block 38 by a terminal holder 60 with an O-ring 68 therebetween. The tight sealing between the circumferences of the terminals 46 and the terminal block 68 is secured by the O-ring 68. Three terminal wires 52 penetrate the sealing parts 48 and 50 of the terminals 46 which close the linkage path. Each terminal wire 52 is composed of one solid metal wire and does not have interstices between strands of a stranded wire. Therefore, the tight sealing between the inside and outside of the stator enclosing vessel 34 is not deteriorated by the terminal wires 52.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a turbo motor pump in which a pump and a motor for driving the pump are integrally formed, and more particularly to a structure of a terminal for supplying electric power to a stator housed in a closed container of the motor. About.

[0002]

2. Description of the Related Art There are known turbo pumps such as a centrifugal pump, a mixed flow pump, and an axial flow pump integrated with a driving motor. As such a driving motor, a canned motor is known. In the canned motor, a stator and a rotor are respectively housed in hermetically sealed containers, and a fluid handled by the pump infiltrates around these. The rotor can be completely hermetically sealed, and the stator has a terminal portion for electrically connecting the coil to the outside of the sealed container in order to supply power to the coil.

In sealing the stator, the terminal portion is the weakest portion, and it is important to securely seal this portion. If the sealing is incomplete, the moisture that has entered from the outside may condense internally and the insulation of the stator may be reduced. In order to ensure the sealing, the terminal portion needs to be sealed with a flange mechanism or the like, which increases the size. On the other hand, downsizing is desired due to restrictions such as installation location and cost. Although not of a sealed structure, as a small terminal, there is a small terminal in which a lead wire of a stranded wire is passed through an opening of a sealed container, the periphery thereof is solidified with resin, and the opening is closed.

[0004]

In the structure of the above-mentioned small terminal portion, a stranded wire is used for the lead wire, so that the gap between each of the conductive wires constituting the stranded wire is not completely sealed, and therefore, There was a problem that the container containing the stator was not completely sealed. In addition, in order to seal more securely, a method of pouring a resin from a tip portion of a stranded wire or a method of soldering a terminal portion of a lead wire tip may be adopted, but it was not possible to completely seal.

The present invention has been made in consideration of the above-described problems, and provides a structure of a terminal portion of a canned motor which is small, inexpensive, and can securely seal a stator.

[0006]

According to the present invention, there is provided a turbopump motor integrally formed with a turbopump according to the present invention, wherein at least a stator is housed in a closed container, and It has a terminal portion provided on a part of the closed container for supplying electric power to the coil from the outside. The terminal portion is provided in the closed container and has a communication passage communicating between the inside and the outside of the closed container, a terminal disposed in the communication passage, and a terminal holder for fixing the terminal to the terminal block. And the terminal further includes a sealing portion that blocks the communication path of the terminal block, and at least one terminal wire formed of one metal wire penetrating the sealing portion. I have.

Further, a sealing means may be arranged in a space surrounded by the terminal block, the terminal and the terminal holder, and the terminal may be hermetically sealed by the sealing means.

Further, the sealing means may be an O-ring.

[0009]

Embodiments of the present invention (hereinafter referred to as embodiments) will be described below with reference to the drawings. FIG. 1 shows a schematic configuration of a canned motor pump 10 of the present embodiment. The canned motor pump 10 is one in which a pump 12 and a canned motor 14 are integrated,
The fluid handled by the pump 12 enters the inside of the canned motor 14, and this fluid lubricates the bearings 16 and 18 and cools the canned motor 14. On the other hand, they are completely sealed so that the handling fluid does not enter the stator or rotor of the motor.

A rotor 24 is provided integrally with a shaft 22 directly connected to the impeller 20 of the pump 12, and the rotor 24 is completely sealed in a rotor sealed container 26. The shaft 22 is rotatably supported by bearings 16 and 18, and these bearings are lubricated by the handling fluid as described above. Therefore, the shaft 22
Around the rotor 24 and around the rotor 24, the handling fluid has entered.
Ingress has been blocked. Thereby, the rotor 2
4 is protected from being corroded by a handling liquid or the like.

A stator 28 is disposed around the rotor 24. The stator 28 includes a core 30 having a comb-shaped irregularity formed inside a cylinder, and a coil 32 formed by inserting a conductive wire into the recess of the core 30. Electric power is supplied to the coil 32 from the outside, and the motor functions. The core 30 and the coil 32 are housed in a stator closed container 34, thereby preventing the handling fluid of the pump 12 from entering and ensuring insulation of the coil 32 and the like. A terminal portion 36 for supplying electric power to the coil 32 of the stator 28 from the outside is provided in the stator closed container 34.

FIG. 2 is an enlarged sectional view of the terminal portion 36. As shown in FIG. A substantially cylindrical terminal block 38 is fixed to the outer peripheral portion of the stator closed container 34 by welding all around. This terminal block 3
The inside of the cylinder 8 serves as a communication path that connects the inside of the stator closed container 34 with the outside. A male screw 40 is provided on the outer peripheral portion at the tip of the terminal block 38. Further, a mortar portion 42 formed by a slope facing inward from the distal end and a shoulder portion 44 at a portion corresponding to the bottom of the mortar portion 42 are provided on an inner peripheral portion of the distal end of the terminal block 38.

A terminal 46 is disposed at the end of the terminal block 38 so as to close the terminal block 38, that is, to close the communication passage. The terminal 46 has a cylindrical portion 48 having a widened skirt and a disk portion 50 arranged substantially orthogonal to the communication passage, and these function as a sealing portion for sealing the communication passage. Three terminal wires 52 penetrate the disk portion 50, and a boundary portion between the terminal wire 52 and the disk portion 50 is sealed with a glass material 54. In addition, the terminal wire 52 is formed of one metal wire, and there is no gap between wires such as a stranded wire. A portion of the terminal wire 52 protruding toward the inside of the stator closed casing 34 is connected to a coil wire 56 led from a coil. On the other hand, the portion protruding outside the stator closed container 34 is connected to an external conductor 58. Thereby, electric power can be supplied to the coil 32 of the stator from the outside.

A terminal holder 60 is fixed to the tip of the terminal block 38. The terminal retainer 60 has a substantially cylindrical cylindrical portion 6.
2 and an inward flange portion 64 protruding in a brim shape on the inner surface of the cylindrical portion 62. At one end of the cylindrical portion 62, a female screw 66 is provided.
Is provided, and is screwed to the external thread 40 of the terminal portion 36. The inner peripheral surface of the inward flange portion 64 is the cylindrical portion 4 of the terminal 46.
8 guides the outer peripheral surface. In addition, the inward flange 64
In the figure, the lower surface of the lower end of the cylindrical portion 64 of the terminal 46 through the O-ring 68 is
4. The O-ring 68 is housed in an annular space having a substantially triangular cross section surrounded by the mortar portion 42 of the terminal block 38, the skirt portion of the cylindrical portion 48 of the terminal 46, and the inward flange portion 64 of the terminal retainer 60. . By using the O-ring here, it is not necessary to adopt a structure in which a sealing surface such as a flange type is exposed to the outside and further tightened and sealed with screws, so that the shape is not reduced. In addition, this provides a sealed structure capable of coping with both internal and external pressures. As the material of the O-ring 68, fluorine rubber having high heat resistance or the like can be used.

In the above-described embodiment, the case of a three-phase motor has been described, but a single-phase motor may be used. In this case, the number of terminal wires is two. In addition, the number of necessary terminal wires can be secured by using a plurality of terminals.

According to the present embodiment, the stator hermetic container 34 can be reliably sealed with a simple structure and small terminals. In addition, sealing can be reliably performed by a simple operation. Also, because no resin is used as in the past,
No lead time is required until the resin is cured.

[Brief description of the drawings]

FIG. 1 is a diagram showing an overall configuration of a canned motor pump according to the present embodiment.

FIG. 2 is a diagram showing details of a terminal portion of the canned motor of the present embodiment.

[Explanation of symbols]

Reference Signs List 10 canned motor pump, 12 pump, 14 canned motor, 24 rotor, 28 stator, 34 stator closed vessel, 36 terminal, 40 external thread, 46
Terminal, 48 cylindrical part (sealing part), 50 disk part (sealing part), 60 terminal holder.

Claims (3)

[Claims] 1. A turbo pump motor integrally formed with a turbo pump, wherein the turbo pump motor has at least a stator housed in a closed container and supplies electric power to a coil of the stator from outside. A terminal part provided in a part of the closed container, the terminal part being provided in the closed container, having a communication path communicating between the inside and the outside of the closed container; and a communication path of the terminal block. A terminal having a sealing portion to be closed, at least one terminal wire formed of one metal wire penetrating the sealing portion, and a terminal retainer for fixing the terminal to the terminal block, Turbo pump motor. 2. The turbo pump motor according to claim 1, wherein sealing means is disposed in a space surrounded by said terminal block, said terminal and said terminal presser, and said terminal means is hermetically sealed by said sealing means. Is performed, turbo pump motor. 3. The turbo pump motor according to claim 2, wherein said sealing means is an O-ring.