JPH022049Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an improvement of a sealed liquid type submersible electric motor, and in particular to a sealed liquid type submersible electric motor in which a bellows that automatically adjusts the pressure of the sealed liquid is prevented from detaching from the machine body.

DESCRIPTION OF THE PREFERRED EMBODIMENTS A conventionally known canned liquid sealed submersible electric motor will be explained with reference to FIGS. 1 and 2. In the figure, 1 is a cylindrical frame, 2 and 3 are a pair of flanges welded to the inner peripheral surfaces of both ends of the frame 1, 2a is a through hole provided in the flange 2, and 4 is a through hole in the flange 2. The upper bracket 4a is screwed together, and the boss portion 4b is formed on the inner circumference of the upper bracket 4.
4c is a passageway for a sealed liquid such as fresh water, which is formed by a cutout groove formed on the inner circumferential surface of the boss portion 4a;
is a through hole provided in the boss portion 4a, 4d is a circumferential groove formed in the boss portion 4a, and 4e is a through hole provided in the flange portion 4f of the upper bracket 4, which is provided on the same axis as the through hole 2a. It is being Reference numeral 4g denotes a female thread formed on the outer end side of the through hole 4e, and 4h denotes a through hole provided in the other flange portion 4i of the upper bracket 4, which is provided on the same axis as the through hole 4e. 4j is a tapered female thread carved on the outer end side of the other flange portion 4i, 4k is a filling and exhaust hole for the filled liquid formed continuously with this tapered female thread 4j (the figure shows only the injection hole), The inner circumferential opening 4l opens into a hollow portion 4m formed in the inner circumferential portion of the upper bracket 4. Reference numeral 5 indicates a stator core fitted onto the inner circumferential surface of the frame body 1, 6 indicates a stator winding wound around the stator core 5, and 7 indicates a pair of flanges 2, 3.
A thin cylindrical can welded to the inner circumferential surface of the stator core 5 is connected to the inner circumferential surface of the stator core 5. 8 is a lower bracket screwed to the collar 3, 8a is a boss formed on the inner circumferential surface of this lower bracket 8, and 8b is an enclosure consisting of a notched groove formed on the inner circumferential surface of this boss 8a. A liquid passage, 9 a rotor core paired with the stator core 5, 10 a rotor shaft fitted to the inner peripheral surface of the rotor core 9, and a pair of cylindrical bearings 11, 1.
2 to upper bracket 4 and lower bracket 8
It is rotatably supported by the upper bracket 4, with one end protruding from the outer end surface of the upper bracket 4 and the other end protruding from the outer end surface of the lower bracket 8, respectively. 13 is the rotor shaft 10
A thrust disk stand 14 fitted to one end of the thrust disk stand 13 is a sliding plate made of carbon or bearing material and bonded or molded to the outer end surface of the thrust disk stand 13. Note that a sand collar (not shown) is fitted to the other end of the rotor shaft 10. 16 is a thrust receiving case screwed to the collar 3, 16
a is a bottomed hole provided at the center of the inner end of the thrust receiving case 16; 16 is a through hole communicating with the bottomed hole 16a; 16c is the thrust receiving case 1
The through hole 16b is a hollow portion formed on the outer end side of the hole 6.
It communicates with the bottomed hole 16a by. 16d is an opening provided on the outer end side of the hollow portion 16c;
e is a through female screw provided in the hollow part 16c, 17
A support shaft is fitted into the bottomed hole 16a via an adjustment washer 18, and the tip thereof is formed into a spherical shape. 1
Reference numeral 9 indicates a thrust support in which a spherical concave portion 19a is swingably supported on the spherical portion at the tip of the support shaft 17, and 20 indicates this thrust support support 19 and the sliding plate 1.
A plurality of thrust receivers sandwiched between 4 and 21
O-rings 22, 23 fitted in the circumferential groove 4d
2 is a pair of oil seals fitted adjacent to the inner peripheral surface of the upper bracket 4; 24 is a power supply cable passing through the through hole 4h; one end thereof is connected to a ground power source (not shown); 25 is the power supply cable 24
A cable connector connected to the other end passes through the through holes 4e and 2a. Reference numeral 26 indicates a lead wire having one end connected to the stator winding 6 and the other end connected to the cable connector 25, 27 an embolus consisting of a taper plug screwed into the tapered female screw 4j, and 28 an injection hole 4h. The inner circumferential portion of the can 7 and the inner circumferential portion of the thrust receiving case 16 are filled with a sealed liquid consisting of, for example, fresh water containing antifreeze. 29 is a hollow cable connector holding nut screwed onto a female screw 4g; 30
The thrust bearing mechanism is composed of a thrust disk base 13, a sliding plate 14, a plurality of thrust receivers 20, a thrust receiver support 19, a support shaft 17, an adjustment washer 18, and a thrust receiver case 16.
Reference numeral 31 denotes a bellows made of an elastic body such as synthetic rubber, which is installed in the hollow portion 16c, and 32 denotes this bellows 3.
1 is a conical compression coil spring that presses the inner part of the hollow part 16c with a predetermined elastic force; 33 is the opening part 16;
A closing part consisting of an end cover fitted to the inner peripheral surface of d, which includes a conical compression coil spring 32 and a bellows 3.
1 is prevented from coming off from the opening 16c. Reference numeral 34 denotes an embolus consisting of a headless setscrew screwed into the female penetrating screw 16e. Note that a pump device (not shown) is coupled to the flange portion 4i of the upper bracket 4. When filling liquid 28 into this canned liquid sealed submersible electric motor, an exhaust hole (not shown) is opened, and the filling liquid 28 is poured through the tapered female thread 4j with the upper bracket 4 facing upward. The filled liquid 28 injected from the tapered female thread 4j is transferred from the tapered female thread 4j to the injection hole 4k to the hollow part 4m to the filled liquid passage 4b to the through hole 4c to the inside of the can 7 to the inner peripheral surface of the can 7 and the outer periphery of the rotor core 9. gap with the surface → inside the can 7 → sealed liquid passage 8b → inside the thrust receiving case 16 → bottomed hole 16a → through hole 16b → flows into the gap between the deep part of the hollow part 16c and the bellows 31 and a predetermined amount of liquid Filled liquid 28 is sealed, and air inside the motor is exhausted from the exhaust hole. Furthermore, when this canned submersible electric motor is installed underwater, it is installed with the upper bracket 4 positioned upward.

Next, the operation of the device configured as described above will be explained. When the operation switch of a canned liquid sealed submersible motor is turned on, the rotor core 9 and rotor shaft 1
0, the thrust disk table 13, the sliding plate 14, the sand collar, and the impeller (not shown) of the pump device rotate together, and the pump device is driven to pump water. In addition, the sealed liquid 28 includes the rotor core 9, the rotor shaft 10,
The fluid is stirred by the thrust disk table 13 and the sliding plate 14, and flows between the pair of cylindrical bearings 11 and 12 and the rotor shaft 10.
, the opposing surface between the sliding plate 14 and the plurality of thrust receivers 20 , the opposing surface between the plurality of thrust receivers 20 and the thrust receiver support 19 , and the opposing surface between the thrust receiver support 19 and the bearing shaft 17 Lubricate surfaces. The temperature of the sealed liquid 28 increases or decreases as the sealed liquid submersible motor continues to operate, the volume expands or contracts, and the pressure increases or decreases. When the pressure of the sealed liquid 28 rises above a predetermined value, the bellows 31 is deviated toward the opening 16d against the elastic force of the conical compression coil spring 32, and the bellows 31 is pushed into the inner part of the hollow part 16c and the bellows 31. The volume of the space thus formed is expanded, and the pressure of the sealed liquid 28 is automatically lowered and adjusted. However, the pressure of the sealed liquid 28 increases for some reason, and the opening 16d and the closing member 3
3 is loosely fitted, the bellows 31 and the closing member 33 separate from the opening 16d and the sealed liquid 28
In addition to leaking out of the fuselage, water containing foreign matter from outside the fuselage also enters the fuselage, damaging insulation and causing early damage to the thrust bearing mechanism 30 and cylindrical bearings 11 and 12.

This invention was made in order to eliminate the above-mentioned drawbacks, and by preventing the bellows, compression coil spring, and closing member from coming off from the opening of the thrust receiving case using an easy-to-work and inexpensive method. , a high-quality, highly reliable submersible liquid sealed type that prevents the filled liquid from leaking outside the aircraft and causing water containing foreign objects to enter the outside of the aircraft, damaging the insulation and damaging bearings, etc. The purpose is to obtain an electric motor. An embodiment of this invention will be described below with reference to FIG. In the figure, 16f is the hollow part 1
A pair of through holes 35 are provided at symmetrical positions on the side of the opening 16d of 6c, and the pin members 35 each include a pair of spring pins connected to the pair of through holes, respectively, and engage with the outer end surface of the closing member 33. This prevents the closing member 33 and the bellows 31 from coming off from the opening 16c. The rest of the structure and operation are the same as those of a conventional canned liquid sealed submersible electric motor, so explanations thereof will be omitted. In this embodiment, the pin member is constituted by a pair of spring pins, but it is needless to say that the present invention is not limited to this embodiment.

As explained above, this invention has a configuration including a pin member that is attached to the opening side of the thrust receiving case and engages with the outer end surface of the closing member, so that the fitting between the closing member and the opening of the hollow portion is prevented. To provide a liquid-filled submersible electric motor of excellent quality and high reliability, since the closing member and bellows can be easily prevented from coming off from the thrust receiving case even if the pressure of the sealed liquid increases abnormally when the pressure is loose. There is an effect that can be done.

[Brief explanation of the drawing]

Figures 1 and 2 show a conventional sealed liquid submersible electric motor, with Figure 1 being a vertical sectional view, Figure 2 being a partially enlarged view of Figure 1, and Figure 3 being an embodiment of this invention. FIG. 2 is an enlarged sectional view of main parts. In the figure, 1 is the frame, 4 is the upper bracket, 4k is the injection and exhaust hole, 5 is the stator core, 7 is the can,
8 is a lower bracket, 9 is a rotor core, 10 is a rotating shaft, 11 and 12 are cylindrical bearings, 30 is a thrust bearing mechanism, 16 is a thrust receiving case, 16a is a bottomed hole, 16b is a through hole, 16c is a hollow part , 16d is an opening, 31 is a bellows, 32 is a conical compression coil spring, 33 is a closing member, 16f is a pair of through holes, and 35 is a pin member. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Claims for Utility Model Registration] (1) A thrust receiving case 16 that is attached to the lower end of the vertical electric motor filled with sealed liquid and receives the thrust load applied to the rotating shaft 10; A hollow part 16c has an opening 16d at the top and a through hole 16b communicating with the liquid sealed in the electric motor.The hollow part 16c is housed in the hollow part 16c to prevent the liquid contained in the electric motor from flowing outside and to prevent the liquid contained in the electric motor from flowing out. A bellows 31 that adjusts the pressure of the liquid, a compression coil spring 32 that presses the bellows 31 toward the inner part of the hollow portion 16c with a predetermined elastic force, and a compression coil spring 32 that closes the opening 16d and moves the compression coil spring 32 and the bellows 31 as described above. A closing member 33 that confines the hollow portion 16c, and a closing member 33 that engages with the closing member 33 to close the opening 1 of the thrust receiving case 16.
The bellows 31 penetrates the 6d side in the radial direction,
A pin member 35 that prevents the compression coil spring 32 and the closing member 33 from coming off the opening 16d.
A liquid-sealed submersible electric motor. (2) The sealed liquid submersible electric motor according to claim 1, wherein the pin member 35 is at least a pair of spring pins arranged in symmetrical positions.