JPS6152128A - Canned motor - Google Patents

Abstract

PURPOSE:To exactly prevent a stator from coming in contact with a rotor, by a method wherein a tongue in the axial direction including the butted section of a can is formed on the can and is formed as a part in the axial direction of a slot opening section. CONSTITUTION:A can 21 is fitted by fitting a tongue 21a in a slot opening section 1c, when the can 21 is inserted in a stator 1. Then, the can 21 and the stator 1 are prevented from being relatively rotated due to the tongue 21a, and a butted section 21b is exactly positioned at the slot opening section 1c and is prevented from shifting to the inner circumference of the slot tooth 1e of the butted section 21b. As a result, the inner circumference of the can 21 is prevented from coming in contact with a rotor 6.

Description

[Detailed description of the invention] [Technical field of invention] This invention relates to improvements in canned motors.

[Prior art]

A conventional electric motor of this type is the electric f! The h machine will be explained according to FIG.

In the figure, 1 is a stator core 1a and a stator coil 1b.
2 is a cylindrical stator frame made of a stainless steel plate that supports the stator 1 on its inner circumference; 3 is a stator frame made of a stainless steel plate;
．． Reference numeral 4 denotes a collar that is welded to both axial ends of the stator frame 2 and constitutes an end plate of a stainless steel plate; 5 is fitted into the inner periphery of the stator 1, and both ends are welded to the collar 3.4; 6 is a stainless steel bracket attached to the collar 3 with a stainless steel bolt 7; 8; a sealing gasket inserted between the bracket 6 and the bolt 7; 9 is attached to the collar 4 with a stainless steel bolt 10; stainless steel bracket, 11b bracket 9
and a sealing gasket installed between the bolt 10 and the bolt 10, 1
2.13 is a radial bearing attached to the bracket 6.9, 14.15 is a thrust bearing attached to the axially inner end of the bracket 6.9, 16 is a rotor paired with the stator 1, and 17 is a thrust bearing attached to the axially inner end of the bracket 6.9. A stainless steel shaft that supports the rotor 16 and is rotatably supported by bearings 12.13, 18.19 is a thrust disk attached to the shaft 17,
It forms a pair with thrust bearings 14 and 15. 20 is a shaft seal detachably attached to the bracket 9.

In the structure constructed as described above, the can 5 is generally a flat plate rolled into a cylindrical shape, and the abutted portions are welded. Furthermore, a cylindrical can 5 is fitted into the stator 1 and has a tab 3.4 welded to each end thereof.

However, the butt part of the can 5 tends to be thicker than other parts, and the outer periphery of the row 6 comes into contact with the inside of the can 5, and the abrasion powder can shorten the life of the bearings 12 and 13 and the shaft seal 20. There was a problem with the decline.

I'm waiting for seam welding of the butt part of can 5,
Not only does the wall thickness increase due to the overlap of the butt portions, but the end portions of the butt portions warp due to seam welding, resulting in a substantial increase in thickness, and the can 5 and rotor 6 The disadvantage was that there was a great risk of contact with other people.

[Summary of the invention]

This invention has been made to solve the above-mentioned drawbacks, and includes forming an axial protrusion on the can that includes the abutting part of the can, and forming the protrusion on the axial part of the slot opening of the stator. By forming this protrusion and positioning it within the slot opening, the abutting part of the can can be reliably positioned within the slot opening, and contact between the can and the rotor can be reliably prevented, and the can can not be pushed into the stator. We provide a canned motor that is easy to use.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIGS. 2 to 4. In the figure, IC is a slot opening of the stator core 1a, ld is a wedge that insulates the stator coil 1b, and 21 is a can that is fitted into the inner circumference of the stator 1 and welded at both ends to the collar 3.4, which is a flat plate shaped like a cylinder. The abutting portion 21b is fixed by seam welding, and a protrusion 21a positioned within the slot opening 1c is formed in the axial direction of the abutting portion 21b.

Note that the protrusion 21m is formed in a part of the slot opening IC in the axial direction.

In the structure configured as described above, when inserting the can 21 into the stator 1, the can 21 is fitted with the protrusion 21a aligned with the slot opening lc.

Here, the protrusion 21a prevents relative rotation between the can 21 and the stator 1, and the abutting portion 21b is reliably positioned in the slot opening IC. e (7) Displacement toward the inner circumference is suppressed. Therefore, contact between the inner circumference of the can 21 and the rotor 6 is prevented.

On the other hand, since the protrusion 21a also contacts the inner wall of the slot opening IC and the sea urchin/nozzle inside the stator core la, relative movement in the axial direction is also suppressed. In addition, Can 2
1 The liquid is poured into the stator 1 through the inside of the collar 3 or 4, and when the protrusion 21& passes through the inside of the collar 3 or 4, the entire can 21 deforms with elasticity. 4, the protrusion 211 protrudes again due to elasticity, and deformation of the protrusion 211 itself during insertion is suppressed.

Here, the protrusion 21a is not formed corresponding to the entire axial direction of the slot opening 1c, but is formed in a part of the axial direction, and allows the can 21 to be inserted through the collar 3 or 4. If so, it can easily pass through the brim 3 or 4,
The protrusion 21a can be easily aligned with the slot opening IC. In other words, when pushing the can 21 into the slot 4, if the protrusion 21& is long, the protrusion 21m will align with the slot opening IC when aligning the slot opening IC and the color of the protrusion 21. Even if the protrusion 2 is not
Due to the push-in resistance between 1a and the inner periphery of the rib 4, it is impossible to judge the mismatch by feeling with the hand, and there is a risk that an assembly failure will occur in which the protrusion 21a rides on the tooth 1e of the slot.
is provided corresponding to a part of the slot opening IC in the axial direction, so that the load applied to the hand when inserting the can 21 into the stake 1 can be adjusted by adjusting the position of the slot opening 1c and the protrusion 21m. This can be determined by feeling.

Next, another embodiment of the present invention will be described with reference to FIG.

In this configuration, the end face 1f of the stator 1 and the end face 4 of the bridge 4 are
The axial dimension B of the protrusion 21a is configured to be smaller than the distance A from the protrusion 21a. Therefore, the can 21 is inserted into the collar 3 (as shown in Figure #55, the protrusion 21a
is in a free state between the end surface 1f of the stator 1 and the end surface 3a of the rib 3, so that the slot opening 1c and the protrusion 21a can be easily aligned.

〔Effect of the invention〕

As described above, the present invention forms an axial protrusion including the protruding part of the can on the can, forms this protrusion on a part of the slot opening of the stator in the axial direction, and connects the protrusion to the slot opening. Since the welded part at the butt part of the can can be reliably positioned within the slot opening, this not only has the effect of reliably preventing contact between the stator and rotor, but also prevents the can from traveling into the stator. This has the effect of making work easier. Furthermore, in another invention, the length of the protrusion in the axial direction is formed to be smaller than the distance between the end face of the stator and the end face of the end plate that faces this end face, so that the alignment of the slot opening and the protrusion is difficult. This has the effect of making it extremely easy.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing a conventional device, Fig. 2 is a sectional view of essential parts showing an embodiment of the present invention, Fig. 3 is an enlarged sectional view of the can of Fig. 2, and Fig. 4 is a sectional view of the can of the present invention. FIG. 5 is an enlarged sectional view of the main part showing another embodiment of the present invention. In the figure, 1 is a stator, IC1 is a slot opening, 1f is an end face, 2 is a stator frame, 4 is a collar, 4a
21 is an end face, 21 is a can, 21a is a protrusion, and 21b is an abutting portion. Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims (4)

[Claims] (1) A cylindrical stator frame abutting portion surrounding the stator is welded to form a cylindrical shape, and the stator frame is formed to include a can fitted to the inner periphery of the stator and the abutting portion of the can, and the stator frame 1. A canned motor comprising an axial protrusion located within a slot opening of the motor, the protrusion being formed in a portion of the slot opening in the axial direction. (2) The canned motor according to claim 1, wherein the abutted portions are overlapped and the overlapped portions are seam welded. (3) A cylindrical stator frame that surrounds the stator, a can that is formed into a cylindrical shape by welding the abutting portions and is fitted to the inner periphery of the stator, and each end of this can and each end of the stator frame a pair of end plates that are watertightly coupled across the stator; and an axial protrusion formed to include the abutting portion of the can and located within the slot opening of the stator, the protrusion extending within the slot opening. The length of the protrusion in the axial direction is smaller than the distance between the end face of the stator and the end face of the end plate opposing this end face. Features: Cand motor. (4) The canned motor according to claim 3, wherein the abutted portions are overlapped and the overlapped portions are seam welded.