CN217873291U

CN217873291U - Multistage canned motor pump of axial force bidirectional balance

Info

Publication number: CN217873291U
Application number: CN202221462143.0U
Authority: CN
Inventors: 刘文星; 张希策; 栾晓颖; 张德波; 钱鸿宇
Original assignee: Dalian Jinshi Pump Co ltd
Current assignee: Dalian Jinshi Pump Co ltd
Priority date: 2022-06-13
Filing date: 2022-06-13
Publication date: 2022-11-22
Anticipated expiration: 2032-06-13

Abstract

The utility model relates to a canned motor pump technical field just discloses an axial force bidirectional balance's multistage canned motor pump, including the canned motor pump body, canned motor pump body one side outer wall front end is provided with the front bearing body, and the sunction inlet has been seted up to the front bearing body inner wall, and front bearing body one side outer wall is provided with pump body outlet flange, and pump body outlet flange inner wall is provided with the export, and sliding bearing assembly before the outer wall of front bearing body one side passes through bolt fixedly connected with. The utility model discloses in, through the first graphite ring that sets up, second graphite ring and third graphite ring, the wear-resisting ring on supplementary impeller and the back bearing body, wear-resisting ring on the shell body is as the vulnerable part, it is simple to dismantle, it is convenient to change, supplementary impeller forms the device of this kind of similar balancing disk simultaneously, when the axial force is not very big, no matter the axial force can both realize forward or backward, thereby the graphite ring is not worn and torn, thereby can be to solving the wearing and tearing of multi-direction self-balancing axial load to internals, increase the life of canned motor pump body.

Description

Multistage canned motor pump of axial force bidirectional balance

Technical Field

The utility model relates to a canned motor pump technical field especially relates to an axial force bidirectional balance's multistage canned motor pump.

Background

The canned motor pump is a motor and pump head integrated leakage-free pump, and mainly comprises a pump body, an impeller, a motor stator, a rotor assembly, a stator shielding sleeve, a stator shielding plate, a sliding bearing assembly and the like.

Axial force imbalance has been a challenge to canned motor pump design. The residual axial force is composed of cover plate force generated by asymmetry of front and rear cover plates of the impeller, dynamic reaction force generated by change of flow direction of liquid flowing through the impeller, and axial force generated by other factors, wherein the cover plate force accounts for the largest ratio and most of the time points to the suction inlet direction of the pump.

The residual axial force is extremely unfavorable for the operation of the pump, the residual axial force can cause the rotor of the pump to move towards the suction inlet of the pump, the axial load of the front sliding bearing assembly is increased, and the front sliding bearing assembly is worn and damaged; causing the dynamic and static parts to contact and wear forcibly; generating strong noise and vibration. The existence of axial force can cause the water pump to be incapable of stably running for a long time, the service life of the water pump is shortened, and the safety of operators is even endangered in severe cases

At present, the axial force is solved by a plurality of methods such as an impeller with back blades, a back mouth ring and a balance hole arranged on the impeller, a pump body with ribs, symmetrical arrangement of the impeller, an additional balance disc device and the like. But these methods can only address forward axial forces.

To this end, we propose a multistage canned motor pump with bidirectional balancing of axial forces.

SUMMERY OF THE UTILITY MODEL

The utility model discloses solve the technical problem that above-mentioned prior art exists, provide an axial force two-way balanced multistage canned motor pump.

In order to achieve the above object, the utility model discloses a following technical scheme, a multistage canned motor pump of axial force two-way balance, including the canned motor pump body, canned motor pump body one side outer wall front end is provided with preceding bearing body, and preceding bearing body inner wall has seted up the sunction inlet, and preceding bearing body one side outer wall is provided with pump body outlet flange, and pump body outlet flange inner wall is provided with the export, and preceding bearing body one side outer wall passes through bolt fixedly connected with preceding sliding bearing assembly, and preceding sliding bearing assembly one side outer wall is provided with the rotor subassembly, and the rotor subassembly outer wall is provided with the motor gap, and the rotor subassembly outer wall is provided with the axle sleeve, the rotor subassembly outer wall is provided with back sliding bearing assembly, and back sliding bearing assembly outer wall passes through bolt fixedly connected with the back bearing body, and back bearing body one side outer wall is provided with first stabilizer ring, first stabilizer ring one side is provided with the fourth graphite ring, is provided with the second screw in the fourth graphite ring, second screw thread connection is in back bearing body inner wall, the canned motor pump body tail end is provided with the shell, and shell body inner wall is provided with the second stabilizer ring, and shell screw, and shell tail end is provided with supplementary impeller on the back shell body, and the rotor subassembly is provided with the second stabilizer ring.

Further, a second hole is formed in the outer wall of one side of the pump body outlet flange, a first pipeline is fixedly connected to the outer wall of one side of the second hole, a fifth hole is formed in the outer wall of one side of the outer shell, a second pipeline is fixedly connected to the inner wall of the fifth hole, and the same first connecting bolt is arranged on the outer wall of one side, opposite to the first pipeline and the second pipeline, of the first pipeline.

Furthermore, first stabilizer ring and sixth hole have been seted up to the rotor subassembly right end, and the eighth hole has been seted up to the axle sleeve outer wall, and seventh hole and eighth hole are located same passageway.

Furthermore, wear-resisting rings are arranged on the first graphite ring, the second graphite ring, the third graphite ring and the fourth graphite ring.

Furthermore, a first hole is formed in the outer wall of one side of the front bearing body, and a third hole is formed in the outer wall of the rear bearing body.

Further, be provided with first cavity between back bearing body and the auxiliary impeller, the auxiliary impeller inner wall is provided with the fourth hole, is provided with the second cavity between auxiliary impeller and the shell body, and the fifth hole extends to the second cavity inner wall, is provided with the third cavity between eighth hole and the back bearing body.

Advantageous effects

The utility model provides a multistage canned motor pump of axial force bilateral balance. The method has the following beneficial effects:

(1) According to the multistage shield pump with the bidirectional balance axial force, the first graphite ring, the second graphite ring and the third graphite ring are arranged, when the multistage shield pump is used, if the axial force is forward, the rotor assembly moves towards the suction inlet direction of the shield pump body, the first graphite ring and the first graphite ring wear-resisting ring on the auxiliary impeller collide with each other, and the problem of wear of a front sliding bearing assembly is solved; if the axial force is backward, the rotor assembly moves towards the direction far away from the suction inlet on the shield pump body, and at the moment, the first graphite ring on the auxiliary impeller collides with the wear-resisting ring on the outer shell, so that the problem of abrasion of the rear sliding bearing assembly is solved; the wear-resistant rings on the auxiliary impeller and the rear bearing body and the wear-resistant ring on the outer shell are used as wearing parts, the device is simple to disassemble and convenient to replace, the auxiliary impeller forms the device similar to a balance disc, when the axial force is not large, self balance can be realized no matter the axial force is forward or backward, the graphite ring is not worn, the abrasion of the multi-direction axial load to internal parts can be avoided, and the service life of the shield pump body is prolonged.

(2) The multistage shield pump with the axial force in bidirectional balance has the advantages that the pump body outlet flange and the auxiliary impeller are arranged, the external pipeline and the auxiliary impeller led out from the pump body outlet flange are used as a secondary pressurization system, and the problem of cavitation generated by conveying an easily vaporized medium can be solved.

Drawings

The structures, the proportions, the sizes, and the like shown in the specification are only used for matching with the contents disclosed in the specification, so as to be understood and read by those skilled in the art, and are not used for limiting the practical limitations of the present invention, so they have no technical essential significance.

Fig. 1 is a front view of the present invention.

Illustration of the drawings: 1. a suction inlet; 2. an outlet; 3. a front bearing body; 4. a first hole; 5. an outlet flange of the pump body; 6. a second hole; 7. a front plain bearing assembly; 8. a motor gap; 9. a first pipeline; 10. a rear sliding bearing assembly; 11. a rear bearing body; 12. a first chamber; 13. a third aperture; 14. an auxiliary impeller; 15. a fourth aperture; 16. a first screw; 17. a second gimbal ring; 18. a second chamber; 19. a first connecting bolt; 20. a second pipeline; 21. a fifth aperture; 22. an outer housing; 23. a second screw; 24. a first graphite ring; 25. a second graphite ring; 26. a first gimbal ring; 27. a sixth hole; 28. a shaft sleeve; 29. a seventh hole; 30. a rotor assembly; 31. a third graphite ring; 32. a fourth graphite ring; 33. an eighth hole; 34. a third chamber.

Detailed Description

The utility model provides a multistage canned motor pump of two-way equilibrium of axial force, as shown in figure 1, including the canned motor pump body, canned motor pump body one side outer wall front end is provided with preceding bearing body 3, suction inlet 1 has been seted up to preceding bearing body 3 inner wall, and preceding bearing body 3 one side outer wall is provided with pump body export flange 5, pump body export flange 5 inner wall is provided with export 2, preceding sliding bearing assembly 7 of 3 one side outer walls of preceding bearing body through bolt fixedly connected with, preceding sliding bearing assembly 7 one side outer wall is provided with rotor assembly 30, rotor assembly 30 outer wall is provided with motor gap 8, and rotor assembly 30 outer wall is provided with axle sleeve 28, rotor assembly 30 outer wall is provided with back sliding bearing assembly 10, back sliding bearing assembly 10 outer wall is through bolt fixedly connected with back bearing body 11, back bearing body 11 one side outer wall is provided with first stabilizer ring 26, first stabilizer ring 26 one side is provided with fourth graphite ring 32, be provided with second screw 23 in the fourth stabilizer ring 32, second screw 23 threaded connection is in back bearing body 11 inner wall, canned motor pump body tail end is provided with

shell

22, 22 inner wall is provided with second stabilizer ring 17, and the outer wall is provided with supplementary screw 14 on the rotor assembly outer wall of graphite ring 14, it is provided with first graphite ring 14 to be provided with supplementary screw on the outer wall of the front end of the rotor assembly 16.

The second hole 6 has been seted up to pump body outlet flange 5 one side outer wall, and the first pipeline 9 of 6 one side outer walls fixedly connected with in second hole, and shell body 22 one side outer wall has seted up fifth hole 21, and the inner wall fixedly connected with second pipeline 20 in fifth hole 21, and the outer wall of one side that first pipeline 9 and second pipeline 20 are relative is provided with same first connecting bolt 19.

The rotor assembly 30 has a first balancing ring 26 and a sixth hole 27 at the right end, and an eighth hole 33 is formed on the outer wall of the shaft sleeve 28, and the seventh hole 29 and the eighth hole 33 are located in the same passage.

Wear-resistant rings are arranged on the first graphite ring 24, the second graphite ring 25, the third graphite ring 31 and the fourth graphite ring 32.

First hole 4 has been seted up to 3 one side outer walls of front bearing body, and third hole 13 has been seted up to 11 outer walls of back bearing body.

A first cavity 12 is arranged between the rear bearing body 11 and the auxiliary impeller 14, a fourth hole 15 is arranged on the inner wall of the auxiliary impeller 14, a second cavity 18 is arranged between the auxiliary impeller 14 and the outer shell 22, a fifth hole 21 extends to the inner wall of the second cavity 18, and a third cavity 34 is arranged between the eighth hole 33 and the rear bearing body 11.

The internal circulation is as follows: firstly, the method comprises the following steps: main circulation: medium is pressurized from the suction inlet 1 through an impeller and flows out from the outlet 2;

II, secondly: in the second circulation loop, because the pump body outlet 2 is the highest point of pressure of the entire pump, a part of the medium enters the second chamber 18 through the second hole 6, the first pipeline 9, the second pipeline 20 and the fifth hole 21, and is pressurized by the auxiliary impeller 14 and punched out through the fourth hole 15 (at this time, the medium is divided into three circulation loops):

a. one part returns to the second chamber 18 through the gap between the first graphite ring 24 and the third graphite ring 31 to complete the circulation;

b. a part of the gas flows into the first chamber 12 through the gap between the fourth graphite ring 32 and the second graphite ring 25, and then flows into the eighth hole 33, the seventh hole 29 and the sixth hole 27 from the gap of the rear sliding bearing assembly 10 to return to the second chamber 18 to complete the circulation;

c. a portion of the fluid flows through the third port 13 into the third chamber 34 and then flows, a portion of the fluid flows through the motor slot 8 and the first port 4 and finally enters the main cycle, and the remaining portion of the fluid flows through the eighth port 33, the seventh port 29 and the sixth port 27 and returns to the second chamber 18 to complete the cycle.

The utility model discloses a theory of operation: through the arrangement of the first graphite ring 24, the second graphite ring 25 and the third graphite ring 31, when the pump is used, if the axial force is forward, the rotor assembly 30 moves towards the suction port 1 of the shield pump body, and the first graphite ring 24 on the auxiliary impeller 14 and the wear-resistant ring of the first graphite ring 24 collide with each other, so that the problem of wear of the front sliding bearing assembly 7 is solved; if the axial force is backward, the rotor assembly 30 moves away from the suction port 1 on the shield pump body, and at this time, the first graphite ring 24 on the auxiliary impeller 14 collides with the wear-resistant ring on the outer shell 22, so that the problem of abrasion of the rear sliding bearing assembly 10 is solved; the auxiliary impeller 14, the wear-resistant rings on the rear bearing body 11 and the wear-resistant rings on the outer shell 22 are used as wearing parts, the disassembly is simple, the replacement is convenient, the auxiliary impeller 14 forms a device similar to a balance disc, when the axial force is not very large, the self balance can be realized no matter the axial force is forward or backward, the graphite ring is not worn, the abrasion of the multi-directional axial load to internal parts can be solved, and the service life of the shield pump body is prolonged.

Through the pump body outlet flange 5 and the auxiliary impeller 14, an external pipeline led out from the pump body outlet flange 5 and the auxiliary impeller 14 are used as a secondary pressurization system, and the problem of cavitation generated by conveying an easily vaporized medium can be solved.

The foregoing shows and describes the basic principles and principal features of the invention, together with the advantages thereof. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only illustrative of the principles of the present invention, and that various changes and modifications may be made without departing from the spirit and scope of the present invention, and all such changes and modifications fall within the scope of the present invention as claimed.

Claims

1. The utility model provides a multistage canned motor pump of axial force bilateral balance, includes canned motor pump body, its characterized in that: the pump is characterized in that a front bearing body (3) is arranged at the front end of the outer wall of one side of the shielding pump body, a suction inlet (1) is formed in the inner wall of the front bearing body (3), a pump body outlet flange (5) is arranged on the outer wall of one side of the front bearing body (3), an outlet (2) is formed in the inner wall of the pump body outlet flange (5), a front sliding bearing assembly (7) is fixedly connected to the outer wall of one side of the front bearing body (3) through bolts, a rotor assembly (30) is arranged on the outer wall of one side of the front sliding bearing assembly (7), a motor gap (8) is formed in the outer wall of the rotor assembly (30), a shaft sleeve (28) is arranged on the outer wall of the rotor assembly (30), a rear sliding bearing assembly (10) is arranged on the outer wall of one side of the rear sliding bearing assembly (10), a rear bearing body (11) is fixedly connected to the outer wall of the rear sliding bearing body through bolts, a first balance ring (26) is arranged on the outer wall of one side of the rear bearing body (11), a fourth graphite ring (32) is arranged on one side of the first balance ring (26), second screws (23) are arranged in the fourth graphite ring (32), the outer wall of the second screws (23) and are connected to the inner wall of the rear bearing body (11) through bolts, a outer wall of the rear bearing body (22) and a rear bearing body (17) is arranged on the outer wall of the shielding pump body (22), the outer wall of the second balance ring (17) is provided with a third graphite ring (31), the outer wall of the third graphite ring (31) is provided with a first screw (16), the first screw (16) is in threaded connection with the inner wall of the outer shell (22), the tail end of the rotor assembly (30) is provided with an auxiliary impeller (14), a front cover plate of the auxiliary impeller (14) is provided with a second graphite ring (25), and a rear cover plate of the auxiliary impeller (14) is provided with a first graphite ring (24).

2. The multistage canned motor pump with bidirectional balancing of axial force according to claim 1, characterized in that: the pump body outlet flange (5) one side outer wall has been seted up second hole (6), the first pipeline (9) of second hole (6) one side outer wall fixedly connected with, and shell body (22) one side outer wall has been seted up fifth hole (21), fifth hole (21) inner wall fixedly connected with second pipeline (20), the relative one side outer wall of first pipeline (9) and second pipeline (20) is provided with same first connecting bolt (19).

3. The multistage canned motor pump with bidirectional balancing of axial force according to claim 1, characterized in that: the right end of the rotor assembly (30) is provided with a first balance ring (26) and a sixth hole (27), the outer wall of the shaft sleeve (28) is provided with an eighth hole (33), and the seventh hole (29) and the eighth hole (33) are located in the same channel.

4. The multistage canned motor pump with bidirectional balancing of axial force according to claim 1, characterized in that: wear-resisting rings are arranged on the first graphite ring (24), the second graphite ring (25), the third graphite ring (31) and the fourth graphite ring (32).

5. The multistage canned motor pump with bidirectional balancing of axial force according to claim 1, characterized in that: the outer wall of one side of the front bearing body (3) is provided with a first hole (4), and the outer wall of the rear bearing body (11) is provided with a third hole (13).

6. The multistage canned motor pump with bidirectional balancing of axial force according to claim 1, characterized in that: a first cavity (12) is arranged between the rear bearing body (11) and the auxiliary impeller (14), a fourth hole (15) is formed in the inner wall of the auxiliary impeller (14), a second cavity (18) is arranged between the auxiliary impeller (14) and the outer shell (22), a fifth hole (21) extends to the inner wall of the second cavity (18), and a third cavity (34) is formed between the eighth hole (33) and the rear bearing body (11).