JPS6152130A - Canned motor - Google Patents

Abstract

PURPOSE:To exactly position the butted section of a can in a slot opening section, by forming two tongues as a part or an almost whole part in the axial direction of a slot opening section and by positioning each tongue in the slot opening section of a stator. CONSTITUTION:When a can 21 is inserted in a stator 1, the can 21 is fitted by fitted by fitting the primary and secondary tongues 21a, 21d in each slot opening section 1c, 1e. Then, the can 21 and the stator 1 are prevented from being relatively rotated due to the primary and secondary tongues 21a, 21d, and a butted section 21b is exactly positioned at the slot opening section 1c and is prevented from shifting to the inner circumference of a slot tooth 1f.

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 kind, ie, the electric motor disclosed in Japanese Utility Model Application Publication No. 55-25779, will be explained with reference to FIG. In the figure, 1 is a stator composed of 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, 3.4
Reference numeral 5 indicates a collar made of stainless steel end plates welded to both ends of the stator frame 2 in the axial direction, 5 a can that is injected into the inner periphery of the stator 1, and both ends of which are welded to the collar 3.4; A stainless steel plate bracket is attached to the collar 3 with a stainless steel bolt 7, 8 is a sealing gasket inserted between the bracket 6 and the bolt 7, and 9 is a stainless steel plate attached to the collar 4 with a stainless steel bolt 10. The bracket 11 is a sealing gasket 12,1 installed between the bracket 9 and the bolt 10.
3 is a radial bearing attached to bracket 6.9,
14.15 is a thrust bearing mounted on the inner end of the bracket 6.9 in the axial direction; 16 is a rotor that is paired with the stator 1; 17 is a rotor that supports the rotor 16;
．． a stainless steel shaft rotatably supported by 13;
8.19 is a thrust disk mounted on the shaft 17, which forms a pair with the thrust bearing 14.15. 20 is a shaft seal detachably attached to the bracket 9.

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

However, the butt part of the can 5 tends to be thicker than other parts, and when the rotor 16 is placed inside the can 5, the outer periphery of the rotor 16 comes into contact with the inner periphery of the can 5, and the abrasion powder is generated. Therefore, there was a problem that the life of the bearings 12, 13 and the shaft seal 20 was shortened.

However, in the case of the can 5 in which the butt parts are seam welded, the butt parts overlap, so not only does the wall thickness become large, but the ends of the butt parts warp due to seam welding, resulting in substantial damage. This has the disadvantage that the thickness is large and there is a high risk of contact between the can 5 and the rotor 6.

[Summary of the invention]

This invention was made to solve the above-mentioned drawbacks, and includes a first protrusion in the axial direction including the abutting part of the can, and a second protrusion parallel to the first protrusion and the axis of the part. By forming these protrusions in part or substantially all of the directions and positioning each of these protrusions within the slot opening of the stator, 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. To provide a canned motor which can also realize reinforcement of the can itself.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIGS. 2 to 4. In the figure, 1c is a slot opening of the stator core 1a, 1d 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 to the tabs 3.4 at both ends. It is formed into a rounded cylindrical shape, and its abutting portion 21b is fixed by seam welding, and a portion of the abutting portion 21b in the axial direction is provided with a first protrusion 21' positioned within the slot opening lc. is formed. 21d is a slot opening that is provided in parallel with the first protrusion 21a on both sides thereof and that is different from the slot opening 1c into which the first protrusion 21a is inserted, that is, a slot on both sides of the slot opening 1c. These are a pair of second protrusions that are respectively fitted into the openings 1e.

In the structure configured as described above, when inserting the can 21 into the stator 1, the first and second protrusions 2
1a, 21d to each slot: T1-opening 1c.

Fit the can 21 into the Ie. Here, the can 21 and the stator 1 are connected by the first and second protrusions 21a.
The abutting portion 21b is reliably positioned in the slot opening 1c, and the abutting portion 21b is prevented from shifting toward the inner periphery of the slot tooth 1f. Therefore, contact between the inner circumference of the can 21 and the rotor 6 is prevented. Moreover, on the other hand, the first and second protrusions 21a.

21d also contacts each slot opening 1c, the inner wall of le, and the wedge 1d in the stator core 1a, so that relative movement in the axial direction is also suppressed.

That is, when the can z1 is inserted, the can 21 having a thin cylindrical shape has the first protrusion 21a and the second protrusion 2.
1d are fitted into the respective slot openings 1c11e, and the respective protrusions 21m and 21d are reliably fitted into the respective slot openings 1c and Ie. In other words, in the case of only the first protrusion 21a, since the can 21 has a thin cylindrical shape, it is highly elastic, and when the first protrusion 21a is inserted into the slot opening IC, There is a risk that the first protrusion 21a may run over the teeth 1f of the slot, but by providing the second protrusion 21d, a plurality of protrusions can be fitted into slot openings at multiple locations at the same time. Displacement of the can 21 in the circumferential direction during fitting can be reliably prevented, and since there are multiple protrusions, the vicinity of the first protrusion 21a is reinforced by the second protrusion 21d. , from this point of view, the first protrusion 21
Can 2 when inserting a into the slot opening 1c
1 can be reliably prevented from shifting in the circumferential direction.

Moreover, the displacement of the can 21 in the axial direction can be reliably suppressed, and the welding work of the can 21 butt 3.4 becomes easier. In other words, since a plurality of protrusions are formed, each protrusion 21a, 2 is formed on the inner wall of the slot openings 1c, 1e.
1d come into contact with each other in a relatively pressed state, and positioning in the circumferential direction and the axial direction is performed by the protrusions.

Note that the can 21 is inserted into the stator 1 through the inside of the bar 3 or 4, and the entire can 21 is elastically deformed at the appropriate time within the protrusion 21a, 21d or the bar 3 or 4. , 3 or 4, it will protrude again due to its elasticity, and the deformation of the stone protrusion 21!1.21d itself during insertion is suppressed.

By the way, the first protrusion 21a and the second protrusion 21d are formed corresponding to a part or substantially all of the slot opening IC11e, so that they protrude from a portion of the entire length of the can 21. , these 21a and 21d are can 2
The can 21 also functions as a reinforcing rib, and the can 21 itself can also be formed from a thin plate.

〔Effect of the invention〕

As described above, the present invention forms a first protrusion in the axial direction including the abutting portion of the can and a second protrusion parallel to the first protrusion, and each protrusion is connected to the slot opening. Since the valley protrusions of and are located within the slot opening of the stator, the welded portion at the abutting part of the can can be reliably positioned within the slot opening, and the connection between the stator and rotor is ensured. The first and second protrusions are located partially along the entire length of the can, and each protrusion functions as a reinforcing rib for the can, increasing the strength of the can itself. I can improve.

[Brief explanation of drawings]

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. 3 is a cross-sectional view of main parts showing the positional relationship between the stator and the stator. In the figure, 1 is the stator,
lc and le are slot openings, 2 is a stator frame,
21 is a can, 21m is a first protrusion, 21b is an abutting portion, and 21d is a second protrusion. Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims (1)

[Claims] A cylindrical stator frame surrounding the stator, a can formed into a cylindrical shape by overlapping and seam welding the abutting parts, a can fitted to the inner periphery of the stator, and a can including the abutting part of the can, a first axial protrusion located in the slot opening of the can; and a second axial protrusion formed in the can and located in another slot opening adjacent to the slot opening in which the first protrusion is located. A canned motor comprising a protrusion, wherein the first protrusion and the second protrusion are formed to correspond to a part or substantially all of the slot opening in the axial direction.