CN104410201B - Eccentric wear-resistant submersible motor - Google Patents

Abstract

The invention discloses an anti-eccentric wear submersible motor, which relates to the technical field of submersible motors. The present invention includes a motor barrel, a stator fixed in the motor barrel and a rotor passing through the stator. The upper and lower ends of the rotor are respectively fitted with an upper guide bearing seat and a lower guide bearing seat fixedly connected with the outer end of the motor barrel. , the upper guide bearing seat is provided with the first seal assembly, the upper bearing, the second seal assembly, and the upper guide bearing in sequence from top to bottom; the structure of the lower guide bearing seat is the same as that of the upper guide bearing seat, specifically , The lower guide bearing seat is provided with a lower guide bearing, a third sealing assembly, a lower bearing, and a fourth sealing assembly in sequence from top to bottom. The invention can ensure the radial positioning of the shaft end of the motor, solve the problems existing in the current technology, avoid the partial wear of the motor shaft, improve the service life of the motor, and expand the use range of the motor.

Description

Anti-eccentric wear submersible motor

technical field

The invention relates to the technical field of submersible motors, in particular to an anti-eccentric wear submersible motor.

Background technique

Well submersible pumps, especially high-lift submersible pumps, are important equipment for deep well water extraction. They lift groundwater to the surface, and are important tools for domestic water, mine rescue, industrial cooling, farmland irrigation, and seawater lifting. The outer diameter of the submersible pump is slender due to the limitation of its installation size, but when used in some special occasions such as mine rescue and fountains, this vertical submersible pump is not suitable, and it needs to be used horizontally or with a certain inclination angle use. However, the horizontal use of the submersible pump will cause the pump motor shaft to be eccentrically worn between the guide bearings due to gravity. After the water pump has been running for a long time in this state, the rotor will be eccentric relative to the stator, and an unbalanced magnetic pull will be formed inside the motor. (unilateral magnetic pull), so that one side of the bearing is always stressed to accelerate its wear, resulting in vibration and noise, and finally the stator and rotor rub against each other until the motor is burned. Such use greatly reduces the service life of the water pump and restricts the use occasion and environment of the submersible pump.

Contents of the invention

The technical problem to be solved by the present invention is to provide an anti-eccentric submersible motor, which can ensure the radial positioning of the motor shaft end, solve the problems existing in the current technology, avoid the eccentric wear of the motor rotor, improve the service life of the motor, and can be horizontal Use or use with a certain inclination angle, which expands the range of use of the motor.

In order to solve the above-mentioned technical problems, the technical solution adopted by the present invention is: an anti-eccentric wear submersible motor, including a motor barrel, a stator fixed in the motor barrel and a rotor passing through the stator, at the upper and lower ends of the rotor The upper guide bearing seat and the guide bearing seat fixedly connected with the outer end of the motor cylinder are respectively set, and the first sealing assembly, the upper bearing, the second sealing assembly, and the upper guide bearing are arranged in the upper guide bearing seat in sequence from top to bottom , the upper end of the rotor passes through the upper guide bearing, the second seal assembly, the upper bearing and the first seal assembly in sequence, and an upper oil seal seat is installed on the inner wall of the upper end of the upper guide bearing seat, and the first seal assembly is installed on the upper oil seal In the seat, the inner wall of the first sealing assembly is in sealing fit with the outer wall of the first shaft sleeve fitted on the rotor; the inner wall of the second sealing assembly is in sealing fit with the outer wall of the second shaft sleeve fitted on the rotor. The outer wall of the second seal assembly is in sealing fit with the inner wall of the upper guide bearing seat; the outer wall of the upper guide bearing is in interference fit with the inner wall of the upper guide bearing seat, and the inner wall of the upper guide bearing is in rotational fit with the second bushing; the upper bearing The inner wall of the upper bearing is in rotation fit with the rotor, and the outer wall of the upper bearing is in interference fit with the inner wall of the upper guide bearing seat;

The structure of the lower guide bearing seat is the same as that of the upper guide bearing seat. Specifically, the lower guide bearing seat is sequentially provided with a lower guide bearing, a third sealing assembly, a lower bearing, and a fourth sealing assembly from top to bottom. The lower end of the rotor passes through the lower guide bearing, the third sealing assembly, the lower bearing, and the fourth sealing assembly in sequence. The outer wall of the four sealing components is in sealing fit with the inner wall of the lower oil seal seat set on the lower end of the lower guide bearing seat; the inner wall of the third sealing component is in sealing fit with the outer wall of the third bushing fitted on the rotor, and the third sealing component The outer wall is in sealing fit with the inner wall of the lower guide bearing seat; the outer wall of the lower guide bearing is in interference fit with the inner wall of the lower guide bearing seat, and the inner wall of the lower guide bearing is in rotational fit with the outer wall of the third bushing; The rotor is rotationally fitted, and the outer wall of the lower bearing is in interference fit with the inner wall of the lower guide bearing seat.

Further, the first sealing component, the second sealing component, the third sealing component and the fourth sealing component are all two skeleton oil seals.

Further, the upper bearing and the lower bearing are both rolling bearings.

Further, the rolling bearing is two discs.

The beneficial effects produced by adopting the above technical solution are: the present invention uses the rolling bearings installed in the upper and lower guide bearing housings to radially position the rotor to ensure that the rotor of the motor is concentric with the stator, preventing the rotor from eccentric wear, and at the same time, the inner wall of the rolling bearing cooperates with the rotor , when the water pump runs to generate axial force, the motor rotor can slide up and down along the rolling bearing without hindering the transmission of axial force; the upper and lower ends of the rolling bearing are equipped with skeleton oil seals for sealing to protect the bearing , to prevent the bearing from rusting due to water ingress;

The invention can avoid eccentric wear of the submersible motor in non-vertical use, greatly reduce the wear of various components, reduce the failure rate of the motor in a non-vertical use environment, prolong its service life, and further improve the use range of the submersible motor.

Description of drawings

Fig. 1 is a structural representation of the present invention;

Fig. 2 is a schematic structural view of the upper guide bearing seat in Fig. 1;

Fig. 3 is a schematic structural view of the upper oil seal seat in Fig. 1;

Fig. 4 is a schematic structural view of the lower guide bearing seat in Fig. 1;

Fig. 5 is a schematic structural view of the lower oil seal seat in Fig. 1;

In the figure: 1, the rotor; 2, the first shaft sleeve; 3, the upper oil seal seat; 4, the first sealing assembly; 5, the upper guide bearing seat; 6, the upper bearing; 7, the second sealing assembly; 8, the second Shaft sleeve; 9. Upper guide bearing; 10. Motor barrel; 11. Stator; 12. Third shaft sleeve; 13. Lower guide bearing; 14. Third seal assembly; 15. Lower bearing; 16. Fourth seal assembly; 17. Lower guide bearing seat; 18. Fourth shaft sleeve; 19. Lower oil seal seat; 20. Non-metallic thrust bearing; 21. Water injection hole; 22. O-ring; 23. Filler; 24. Rubber cover.

detailed description

The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

Because in actual use, the submersible motor needs to adjust the placement position according to the specific occasion of use, and because the best use state of the current vertical submersible motor is vertical placement, inclined or horizontal placement will cause damage to the rotor of the motor. Eccentric wear affects the service life of the motor.

The invention improves on the situation that the application occasion of the vertical submersible motor is limited. Refer to Fig. 1, Fig. 3 and Fig. 5 for the specific structure. The upper and lower ends of the submersible motor rotor 1 are respectively sleeved with an upper guide bearing seat 5 and a lower guide bearing seat 17 fixedly connected with the outer end of the motor cylinder 10. The upper guide bearing seat 5 is provided with a first sealing assembly 4, an upper bearing 6, a second sealing assembly 7, and an upper guide bearing 9 in order from top to bottom, and the upper end of the rotor 1 passes through the upper guide bearing 9, the second sealing assembly 7, and the upper guide bearing in sequence. The bearing 6 and the first seal assembly 4 are equipped with an upper oil seal seat 3 on the inner wall of the upper end of the upper guide bearing seat 5, and the first seal assembly 4 is installed in the upper oil seal seat 3, and the inner wall of the first seal assembly 4 is in contact with The outer wall of the first shaft sleeve 2 tightly fitted on the rotor 1 is in sealing fit; the inner wall of the second sealing assembly 7 is in sealing fit with the outer wall of the second shaft sleeve 8 tightly fitted on the rotor 1, and the outer wall of the second sealing assembly 7 The outer wall is in sealing fit with the inner wall of the upper guide bearing seat 5; the outer wall of the upper guide bearing 9 is in interference fit with the inner wall of the upper guide bearing seat 5, and the inner wall of the upper guide bearing 9 is rotationally matched with the second shaft sleeve 8; The inner wall of the bearing 6 is in rotational fit with the rotor 1, and the outer wall of the upper bearing 6 is in interference fit with the inner wall of the upper guide bearing seat 5.

The structure of the lower guide bearing seat 17 is the same as that of the upper guide bearing seat 5. Specifically, the lower guide bearing seat 17 is sequentially provided with the lower guide bearing 13, the third sealing assembly 14, the lower bearing 15, the first Four sealing components 16, the lower end of the rotor 1 passes through the lower guide bearing 13, the third sealing component 14, the lower bearing 15, and the fourth sealing component 16 in sequence, the inner wall of the fourth sealing component 16 is matched with the rotor 1 The outer wall of the fourth bushing 18 is in sealing fit, the outer wall of the fourth sealing assembly 16 is in sealing fit with the inner wall of the lower oil seal seat 19 which is set on the lower end of the lower guide bearing seat 17; the inner wall of the third sealing assembly 14 is in sealing fit with The outer wall of the third shaft sleeve 12 on the rotor 1 is in sealing fit, the outer wall of the third sealing assembly 14 is in sealing fit with the inner wall of the lower guide bearing seat 17; the outer wall of the lower guide bearing 13 is in interference with the inner wall of the lower guide bearing seat 17 Cooperate, the inner wall of the lower guide bearing 13 is rotationally matched with the outer wall of the third shaft sleeve 12;

The present invention radially positions the rotor 1 of the motor through the rolling bearing arranged in the guide bearing seat, provides support for the rotor 1 when the motor is in tilted or horizontal use, ensures that the rotor 1 has no displacement in the radial direction, and ensures that the rotor 1 and the stator 11 Concentric; at the same time, the inner ring of the rolling bearing is matched with the motor rotor 1. It can be seen from Fig. There is a certain gap between them. When the motor generates an axial force, the motor rotor 1 has room to move axially, and can slide up and down along the inner ring of the rolling bearing without affecting the transmission of the axial force.

Correspondingly, there are skeleton oil seals on the upper and lower ends of each set of rolling bearings, which can seal the rolling bearings and prevent water from entering the rolling bearings to cause corrosion and affect the service life of the bearings.

In order to further improve the sealing effect, the first sealing component 4 , the second sealing component 7 , the third sealing component 14 and the fourth sealing component 16 are two skeleton oil seals. Wherein the outer end space of the first sealing assembly 4 is plugged with a filler.

Wherein the skeleton oil seal and the guide bearing are both sleeved on the shaft sleeve, the shaft sleeve is a vulnerable part, after wear and tear, only the shaft sleeve can be replaced, and the shaft sleeve plays a role in protecting the rotor 1 .

The outer walls of the upper oil seal seat 3 and the lower oil seal seat 19 are all provided with sealing rings to further seal the bearings installed in the guide bearing seat.

In order to ensure that the rotor 1 of the motor will not be eccentrically worn when it is used in other non-vertical positions such as tilting or lying down, two disc rolling bearings are used at the upper and lower ends of the rotor 1.

Referring to Fig. 2 and Fig. 4, water injection holes 21 are all provided on the two guide bearing housings for injecting water into the guide bearings and lubricating the guide bearings.

The upper end and the lower end of the submersible motor respectively have a set of anti-eccentric wear structures, so that both ends of the motor shaft can rely on the anti-eccentric wear structures for radial positioning. The anti-eccentric wear structure of the upper and lower ends of the submersible motor is composed of a guide bearing seat, a skeleton oil seal, a rolling bearing, and an oil seal seat, which jointly ensure that the rotor 1 and the stator 11 are coaxial when the submersible motor is used in a non-vertical position, and no eccentric wear occurs, reducing The wear of bearings, skeleton oil seals, oil seal seats, shaft sleeves and other components reduces the failure rate and prolongs the service life of each component, thereby improving the service life of the motor.

During the use of the submersible pump, the rolling bearing is installed in the bearing seat and passed through the motor shaft to provide radial positioning for the motor shaft and ensure the concentricity between the rotor 1 and the stator 11 of the motor. At the same time, the inner ring of the rolling bearing cooperates with the motor rotor 1. When the water pump generates axial force, the motor shaft can slide up and down without hindering the transmission of the axial force. The skeleton oil seals at the upper and lower ends of the rolling bearing play a sealing role to ensure that water will not touch the bearing and cause the bearing to rust.

Beneficial effects of the present invention:

1. By improving the structure of the original submersible motor, the anti-eccentric wear performance of the submersible motor is increased, and the applicable scope of the submersible motor is expanded.

2. The present invention avoids the horizontal use of the vertical submersible motor, and the radial positioning of the motor rotor cannot be guaranteed at the first end, and can meet the axial sliding requirement of the motor rotor due to the axial force of the water pump. Compared with the existing submersible motor, the utility model is a better submersible pump motor for horizontal wells.

Claims (4)

1. a kind of anti-eccentric wear submersible motor is it is characterised in that include motor cylinder (10), the stator being fixed in motor cylinder (10) (11) and the rotor (1) that is through in stator (11), it is respectively installed with the outer end with motor cylinder in the upper and lower ends of described rotor (1) The upper leading axle bearing (5) being fixedly linked and lower leading axle bearing (17), are sequentially provided with first close from top to bottom in upper leading axle bearing (5) Sealing assembly (4), upper bearing (metal) (6), the second black box (7), top guide bearing (9), rotor (1) upper end sequentially passes through top guide bearing (9), the second black box (7), upper bearing (metal) (6) and the first black box (4), in upper leading axle bearing (5) upper end inner wall of end dress Have upper oil seal seat (3), described first black box (4) is contained in oil seal seat on this (3), described first black box (4) interior The outer wall sealing cooperation of wall first axle sleeve (2) on rotor (1) with cooperation；The inwall of described second black box (7) with join It is combined in outer wall sealing cooperation, the outer wall of the second black box (7) and the upper leading axle bearing (5) of the second axle sleeve (8) on rotor (1) Inner wall sealing cooperation；The outer wall of described top guide bearing (9) and the inwall interference fit of upper leading axle bearing (5), top guide bearing (9) Inwall be rotatably assorted with the second axle sleeve (8)；The inwall of described upper bearing (metal) (6) and rotor (1) are rotatably assorted, upper bearing (metal) (6) Outer wall and the inwall interference fit of upper leading axle bearing (5)；

The structure of described lower leading axle bearing (17) is identical with the structure of upper leading axle bearing, specifically, in lower leading axle bearing (17) certainly Sequentially it is provided with lower guide bearing (13), the 3rd black box (14), lower bearing (15), the 4th black box (16), rotor under up to (1) lower end sequentially passes through lower guide bearing (13), the 3rd black box (14), lower bearing (15), the 4th black box (16), institute State the outer wall sealing cooperation of the inwall of the 4th black box (16) the 4th axle sleeve (18) with cooperation on rotor (1), described the The outer wall of four black boies (16) is coordinated with lower oil seal seat (19) inner wall sealing being sleeved on lower leading axle bearing (17) lower end； The outer wall sealing cooperation of the inwall of described 3rd black box (14) the 3rd axle sleeve (12) on rotor (1) with cooperation, the 3rd The outer wall of black box (14) is coordinated with the inner wall sealing of lower leading axle bearing (17)；The outer wall of described lower guide bearing (13) with lead The inwall interference fit of bearing block (17), the inwall of lower guide bearing (13) is rotatably assorted with the outer wall of the 3rd axle sleeve (12)；Described Lower bearing (15) inwall is rotatably assorted with rotor (1), the inwall interference fit of lower bearing (15) outer wall and lower leading axle bearing (17).

2. anti-eccentric wear submersible motor according to claim 1 it is characterised in that described the first black box (4), second Black box (7), the 3rd black box (14), the 4th black box (16) are two outside framework oil seals.

3. anti-eccentric wear submersible motor according to claim 1 is it is characterised in that described upper bearing (metal) (6) and lower bearing (15) it is rolling bearing.

4. anti-eccentric wear submersible motor according to claim 3 is it is characterised in that described rolling bearing is two disks.