JPH0452701B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to improvements in canned submersible electric motors, and in particular to the sealing of screw holes provided in a sealed container housing a stator and communicating between the inside and outside of the sealed container. This invention relates to improvement of the stop structure.

[Conventional technology]

A conventional canned submersible electric motor having this type of structure will be explained with reference to FIGS. 1 and 2.

In the figure, 1 is a frame, 1a and 1b are flanges formed at both ends of the frame 1, 1c is a large-diameter internal thread provided on the flange 1a, and 1d is concentric with this large-diameter female thread 1c. It is a small-diameter female threaded portion formed in communication with a large-diameter female threaded portion 1c and a small-diameter female threaded portion 1d.
This constitutes a screw hole 1e that communicates between a space 7 formed by the frame 1 and the can 4, which will be described later, and the outside.

2 is a stator core fitted to the inner peripheral surface of the frame 1;
3 is a stator winding wound around this stator core 2;
Reference numeral 4 indicates a thin cylindrical can which is welded to the inner peripheral surfaces of the flanges 1a and 1b, respectively, and the frame 1 and the can 4
Together, they form a sealed container that accommodates the stator core 2 and stator winding 3.

5 is a rotor core that pairs with the stator core 2; 6 is a rotor shaft fitted into the rotor core 5; an upper bracket and a lower bracket (not shown) are screwed to both ends of the frame 1, respectively; The upper bracket is rotatably supported by the upper bracket via cylindrical bearings, and one end protrudes from the outer end surface of the upper bracket.

Furthermore, a pair of thrust disks are coupled to the rotor shaft 6 at predetermined locations, and thrust bearings opposing the pair of thrust disks are coupled to the upper and lower brackets, respectively (none of them are shown). figure).

7 is a space of a sealed container formed between the outer circumferential surface of the can 4 and the inner circumferential surface of the frame 1 and accommodates the stator core 2 and the stator winding 3, and 8 is a screw hole 1e in this space 7. gas such as helium, which is injected with
Reference numeral 9 denotes a pan-head screw which is a screwing member screwed to the small diameter female threaded portion 1d. 10 is a large diameter female threaded portion 1c
A sealant made of resin that is injected into the interior and hardened.
A pan-head screw 9 is fixed to the threaded portion of the large-diameter female threaded portion 1c, and the large-diameter female threaded portion 1c is hermetically sealed.

In the conventional canned submersible electric motor configured as described above, helium gas is injected into the space 7 through the screw hole 1e, the pan head screw 9 is screwed into the small diameter female threaded portion 1d, and then the large diameter female threaded portion 1c is inserted into the large diameter female threaded portion 1c. Fill with resin as shown and harden.

[Problem to be solved by the invention]

The conventional canned submersible motor of this type, especially the sealing structure for the screw hole 1e, is constructed as described above, and since the sealant 10 is a resin, it takes a long time from injection to hardening at room temperature. There was a problem with decreased productivity. Furthermore, in order to shorten the curing time, the sealant 10 must be heated, which also poses a problem of poor productivity.

This invention was made to solve these problems, and aims to provide a canned underwater motor that can reliably seal screw holes, shorten curing time, and improve productivity. shall be.

[Means to solve the problem]

In the canned submersible electric motor according to the present invention, a first screw member and a second screw member are respectively screwed into screw holes formed in a sealed container and communicating between the inside and outside of the sealed container, and The gap between the first and second screw members is filled with an anaerobic adhesive.

[Effect]

The second screwing member in this invention presses the anaerobic adhesive filled in the gap between the first and second screwing members and the screw hole. It helps the anaerobic adhesive penetrate into the joint, and also blocks air from being supplied to the anaerobic adhesive from the outside, allowing the anaerobic adhesive to harden quickly.

Furthermore, since the anaerobic adhesive is filled in the gap, there is no risk of it dripping before it hardens.

Therefore, the screw hole is reliably sealed, and the work is easy and the work time is shortened.

〔Example〕

An embodiment of the present invention will be described below with reference to FIG.

In the figure, 1e is a screw hole provided in the collar 1a and communicates the space 7 with the outside, and 11 is this screw hole 1.
After injecting a gas 8 such as helium into the space 7 from e, the first headless setscrew serves as a first screwing member that is screwed into the screw hole 1e to close the screw hole 1e.

12 is an anaerobic adhesive that is injected into the screw hole 1e after the first headless setscrew 11 is screwed into the screw hole 1e, and 13 is an anaerobic adhesive that is injected into the screw hole 1e.
A second headless set screw serves as a second screwing member that is screwed from the outside of the airtight container into the screw hole 1e.

Note that the anaerobic adhesive 1 injected into the screw hole 1e
2 is pressed by screwing the second headless set screw 13 into the screw hole 1e to connect the first headless set screw 11 to the screw hole 1e and the second headless set screw 1.
3 and the screw hole 1e, the supply of air from the outside is cut off by the second headless setscrew 13, and the first screw hardens in a short time.
headless set screw 11, second headless set screw 1
3 to completely close the screw hole 1e to reliably prevent the gas 8 in the space 7 from leaking from the screw hole 1e.

〔Effect of the invention〕

As explained above, in this invention, a first screw member and a second screw member are respectively screwed into screw holes provided in an airtight container with a gap provided, and the gap is filled with an anaerobic gas. This anaerobic adhesive is pressed by the second screwing member and penetrates between the screw hole and the first screwing member and between the screw hole and the second screwing member. , it is possible to reliably seal the screw hole and improve productivity.

[Brief explanation of the drawing]

Figures 1 and 2 show a conventional canned submersible motor, with Figure 1 being a partial sectional view, Figure 2 being an enlarged sectional view of the screw hole sealing structure in Figure 1, and Figure 3 being a partial sectional view. FIG. 1 is an enlarged sectional view showing a main part of an embodiment of the present invention. In the figure, 1 is a frame, 1a and 1b are collars, 1e is a screw hole, 2 is a stator core, 3 is a stator winding, 4 is a can, 7 is a space, 8 is a gas, and 11 is a first A first headless set screw 12 is an anaerobic adhesive as a screwing member, and 13 is a second headless set screw serving as a second screwing member. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Scope of Claims] 1. A canned submersible motor having a stator housed in an airtight container, comprising: a screw hole that communicates between the inside and the outside of the airtight container; a first screw threaded into the screw hole; a second screwing member that is screwed together from the outside of the airtight container by providing a gap with the first screwing member in the screw hole; and a second screwing member that is filled in the gap and is blocked from air. A canned underwater electric motor characterized by being equipped with a hardening anaerobic adhesive.