CN112524051A

CN112524051A - Water lubricating centrifugal pump

Info

Publication number: CN112524051A
Application number: CN202011262019.5A
Authority: CN
Inventors: 王永康
Original assignee: Zhejiang Donghang Fire Pump Co ltd
Current assignee: Zhejiang Donghang Fire Pump Co ltd
Priority date: 2020-11-12
Filing date: 2020-11-12
Publication date: 2021-03-19
Anticipated expiration: 2040-11-12
Also published as: CN112524051B

Abstract

The application relates to a water lubrication centrifugal pump, which relates to the field of water pumps and comprises a motor, a pump body, a rotating shaft and a working impeller, wherein the pump body comprises a water suction port and a water discharge port, and a water lubrication bearing and a first rotating sealing piece are arranged between a bearing seat and the rotating shaft; the pump body is connected with a water pipe I and a water pipe II, an auxiliary impeller is coaxially fixed on the rotating shaft, the bearing block is provided with an auxiliary cavity for rotation of the auxiliary impeller, the bearing block is provided with a water inlet and a water outlet, the end part of the auxiliary cavity is communicated with the water lubrication bearing through the water inlet, the side wall of the auxiliary cavity is communicated with the water pipe II through the water outlet, and water is driven to circulate along the water inlet and the water outlet when the auxiliary impeller rotates. The water-lubricated centrifugal pump improves the water flow passing through the water-lubricated bearing at a low rotating speed, and ensures the normal operation of the bearing; the water flow passing through the water-lubricated bearing is reduced at a high rotating speed, and the burden on sealing is reduced; the water absorption function of the rotation of the auxiliary impeller can suck out impurities in the water lubricated bearing, and the service life of the water lubricated bearing is prolonged.

Description

Water lubricating centrifugal pump

Technical Field

The application relates to the field of water pumps, in particular to a water lubrication centrifugal pump.

Background

On the boats and ships, the application of centrifugal pump is very extensive, and the centrifugal pump has advantages such as simple structure, part are few, the trouble is few, durable, and the displacement is big during operation, can not produce pressure pulse. The rotating shaft bearing of the existing centrifugal pump adopts a water lubrication mode.

Chinese utility model patent with grant bulletin number CN2881167Y discloses a water film lubrication vertical centrifugal pump, which comprises a motor support, motor and the pump body, be equipped with the transmission shaft in the motor support, be equipped with the impeller in the transmission shaft lower part, the cover is equipped with the pump cover at transmission shaft middle part cover, be equipped with the end cover on the pump cover, still be equipped with retaining ring and mechanical seal on the transmission shaft, it is equipped with the axle sleeve by supreme down in proper order in the pump cover on the transmission shaft, balance disc and floating disc, the balance disc is echelonment and suit on the axle sleeve, the balance disc middle part forms annular cavity with the pump cover, it is equipped with the inlet opening along radial to correspond annular cavity department on the pump cover, inlay on the balance disc inner wall and be equipped with wear-resisting cover, there is the hole of permeating water along the circumferenci. Two ends of the water lubricating bearing are respectively communicated with a water outlet and a water suction port of the water pump through pipelines.

Compared with oil lubrication, the water lubrication bearing structure avoids oil leakage and has better bearing heat dissipation effect.

In view of the above-mentioned related technologies, the inventor believes that the cooling water of the centrifugal pump bearing comes from the water outlet of the water pump and the water suction port of the water pump after use, the pressure difference between the water outlet and the water suction port determines the water flow passing through the bearing, and when the pressure difference between the water outlet and the water suction port is small, the water passing through the water-lubricated bearing is insufficient, which affects the normal operation of the bearing.

Disclosure of Invention

In order to guarantee bearing normal operating when low rotational speed, the application provides a water lubrication centrifugal pump.

The application provides a water lubrication centrifugal pump adopts following technical scheme:

a water lubrication centrifugal pump comprises a motor, a pump body, a rotating shaft and a working impeller, wherein the pump body comprises a water suction port and a water discharge port, the rotating shaft is driven by the motor to rotate, the working impeller is positioned in the pump body and fixed with the rotating shaft, a bearing seat is fixed on the pump body, a water lubrication bearing and a first rotary sealing element are arranged between the bearing seat and the rotating shaft, the water lubrication bearing is rotatably connected between the bearing seat and the rotating shaft, the first rotary sealing element is positioned on one side of the water lubrication bearing, which is far away from the working impeller, and the first rotary sealing element is rotatably sealed between the bearing seat and the rotating shaft;

the pump body is connected with a first water service pipe and a second water service pipe, one end of the first water service pipe is communicated with the water outlet, one end of the second water service pipe is communicated with the water suction port, the other ends of the first water service pipe and the second water service pipe are respectively communicated with two ends of the water lubricating bearing, an auxiliary impeller is coaxially fixed on the rotating shaft, an auxiliary cavity for rotation of the auxiliary impeller is arranged on the bearing seat, the auxiliary impeller is located between the water lubricating bearing and the rotating sealing piece I, the bearing seat is provided with a water inlet and a water outlet, the end portion of the auxiliary cavity is communicated with the water lubricating bearing through the water inlet, the side wall of the auxiliary cavity is communicated with the second water service pipe through the water outlet, and water is driven to circulate.

By adopting the technical scheme, when the motor is in a low-rotation-speed state, on one hand, the water pressure of the water outlet is greater than that of the water suction port, water can flow through the first water passing pipe, the bearing seat and the second water passing pipe spontaneously, the water passes through the water lubricating bearing to lubricate and dissipate the water, but the water passing capacity in the state is possibly insufficient. Because the auxiliary impeller rotates along with the rotating shaft, the auxiliary cavity generates suction at the water inlet to drive water to flow along the water inlet, the auxiliary cavity and the water outlet, so that the water flow and the flow speed of the water lubricated bearing are improved, an efficient heat dissipation and lubrication effect is achieved for the water lubricated bearing, and the bearing can normally run.

Optionally, the auxiliary impeller is slidably disposed on the rotating shaft, a sliding connection is established between the auxiliary impeller and the rotating shaft through a key groove structure, the auxiliary impeller is fixed with a sliding sleeve, the sliding sleeve extends out of the bearing seat, the first rotary sealing element is located between the sliding sleeve and the bearing seat, and a sliding seal is disposed between the sliding sleeve and the rotating shaft.

Through adopting above-mentioned technical scheme, when the motor was in low rotational speed state, the supplementary impeller of slip was to the position that is close to the water inlet. The auxiliary impeller rotates to achieve a water pumping effect, and a high-efficiency heat dissipation and lubrication effect is achieved for the water lubrication bearing. When the motor is in a high-speed state, on one hand, the pressure difference between the water outlet and the water suction port is increased, and the water flow passing through the water-lubricated bearing is enough to meet the requirement and is possibly excessive, so that the adverse effect on each seal can be generated. At this moment, personnel can pull the sliding sleeve to slide, will assist the impeller and remove to the position of keeping away from the water inlet, assisting the skew delivery port of impeller lateral wall, and the rotation of assisting the impeller can not produce the effect of drawing water under this state, stirs the water of assisting the intracavity on the contrary, produces the flow resistance to the water through assisting the chamber, has reduced the discharge through the lubricated bearing of water like this, when satisfying heat dissipation, lubricated demand, is difficult for producing the burden to each sealed.

Optionally, the end of the sliding sleeve departing from the bearing seat is provided with an iron block, the motor housing is fixed with an electromagnet, and the electromagnet is opposite to the iron block.

By adopting the technical scheme, the auxiliary impeller moves along the axial direction of the rotating shaft under the control of the electromagnet, and personnel can move the auxiliary impeller in the direction far away from the water inlet by controlling the on-off of the power supply of the electromagnet, so that the auxiliary impeller is convenient; the reset movement of the auxiliary impeller may be achieved by its own weight.

Optionally, the motor has a high-speed switch and a low-speed switch for adjusting the rotation speed, the switch of the electromagnet is linked with the high-speed switch, and the switch of the electromagnet is switched on when the high-speed switch is switched on.

By adopting the technical scheme, after the rotating speed of the motor is increased, the switch of the electromagnet can be automatically switched on, and the electromagnet is started without independent control, so that the motor is convenient.

Optionally, one of the rotary sealing elements includes a leather cup, a movable ring and a static ring, the outer wall fixed on the sliding sleeve is arranged on the movable ring sleeve, the leather cup sleeve surrounds the rotating shaft, one end of the leather cup is fixedly sealed with the bearing seat, the other end of the leather cup is fixedly sealed with the static ring, the movable ring and the static ring are abutted through end faces, the leather cup has elastic force, and the elastic force of the leather cup orders about the static ring to abut against the movable ring.

Through adopting above-mentioned technical scheme, the leather cup has elasticity, thereby the elasticity of leather cup can guarantee that the quiet ring supports tight rotating ring and ensures the leakproofness, and can provide the restoring force for the auxiliary impeller removes to the water inlet.

Optionally, a spring is embedded in the leather cup, and the spiral axis of the spring coincides with the axis of the leather cup.

Through adopting above-mentioned technical scheme, the setting of spring is used for promoting elasticity and the restoring force of leather cup, and the spring forms skeleton texture in the leather cup, has improved the anti tilting ability of quiet ring.

Optionally, a second rotary sealing element is arranged between the bearing seat and the rotating shaft, the second rotary sealing element is located on one side, facing the working impeller, of the water lubrication bearing, and rotary sealing is established between the bearing seat and the rotating shaft by the second rotary sealing element.

Through adopting above-mentioned technical scheme, the rotary seal spare is two-purpose to be used for preventing that the pump chamber water pressure in the pump body center from influencing the water lubricated bearing.

Optionally, the first water pipe and the second water pipe are connected with the pump body through joints.

By adopting the technical scheme, the first water service pipe and the second water service pipe can be conveniently disassembled and assembled with the pump body by arranging the joint, and the first water service pipe and the second water service pipe are convenient to replace after being damaged and leaked.

In summary, the present application includes at least one of the following beneficial technical effects:

1. the water flow passing through the water-lubricated bearing is improved at a low rotating speed, and the normal operation of the bearing is ensured;

2. the water flow passing through the water-lubricated bearing is reduced at a high rotating speed, and the burden on sealing is reduced;

3. the water absorption function of the rotation of the auxiliary impeller can suck out impurities in the water lubricated bearing, and the service life of the water lubricated bearing is prolonged.

Drawings

Fig. 1 is a sectional view of a water-lubricated centrifugal pump of an embodiment.

Fig. 2 is a partial view of the embodiment.

Fig. 3 is a system diagram of a switch of an embodiment.

Description of reference numerals: 1. a motor; 2. a pump body; 11. a rotating shaft; 20. a working impeller; 21. a water suction port; 22. a water outlet; 3. a bearing seat; 31. water lubricating the bearing; 32. an auxiliary cavity; 33. an auxiliary impeller; 321. a water inlet; 322. a water outlet; 34. a sliding sleeve; 341. a seal ring; 342. an iron block; 23. a joint; 41. a water pipe I; 42. a water pipe II; 5. rotating the first sealing element; 6. rotating the second sealing element; 51. a leather cup; 52. a moving ring; 53. a stationary ring; 511. a spring; 12. an electromagnet.

Detailed Description

The present application is described in further detail below with reference to figures 1-3.

The embodiment of the application discloses a water lubrication centrifugal pump. Referring to fig. 1, the water lubricating centrifugal pump includes a motor 1 and a pump body 2, an output shaft of the motor 1 is a rotating shaft 11, the rotating shaft 11 penetrates into the pump body 2, an operating impeller 20 is coaxially fixed at an end of the rotating shaft, the pump body 2 is provided with a water suction port 21 and a water discharge port 22, and when the operating impeller 20 rotates, water is driven to flow along the water suction port 21, the pump cavity and the water discharge port 22. One side of the pump body 2 facing the motor 1 is fixed with a bearing seat 3, the rotating shaft 11 penetrates through the center of the bearing seat 3, a water lubrication bearing 31 is arranged between the bearing seat 3 and the rotating shaft 11, and the water lubrication bearing 31 is rotatably connected between the bearing seat 3 and the rotating shaft 11.

Referring to fig. 1 and 2, an auxiliary cavity 32 is further disposed in the bearing seat 3, the auxiliary cavity 32 is located on one side of the water lubrication bearing 31 facing the motor 1, an auxiliary impeller 33 is disposed in the auxiliary cavity 32, the auxiliary impeller 33 is sleeved outside the rotating shaft 11 and is disposed coaxially with the rotating shaft 11, a sliding connection is established between the auxiliary impeller 33 and the rotating shaft 11 through a key groove structure, and the sliding direction of the auxiliary impeller 33 is along the axial direction of the rotating shaft 11. The auxiliary cavity 32 is provided with a water inlet 321 towards the middle of the water lubricated bearing 31, the water inlet 321 is communicated with the water gap of the water lubricated bearing 31, and the water inlet 321 faces the end face of the auxiliary impeller 33. The side wall of the auxiliary cavity 32 is provided with a water outlet 322, and the water outlet 322 is opposite to the side surface of the auxiliary impeller 33. When the auxiliary impeller 33 rotates, a suction force can be generated at the water inlet 321, and the auxiliary impeller 33 drives water to flow along the water inlet 321, the auxiliary cavity 32 and the water outlet 322. The auxiliary impeller 33 is arranged at a position corresponding to the position of the water lubricated bearing 31: the auxiliary impeller 33 is located at a position where the end surface of the auxiliary impeller 33 abuts on the opening of the water inlet 321, and the auxiliary impeller 33 generates a strong suction force at the water inlet 321 when rotating at this position.

A sliding sleeve 34 is fixed on the end surface of the auxiliary impeller 33 facing the direction of the motor 1, the sliding sleeve 34 is sleeved outside the rotating shaft 11 and is in sliding contact with the outer wall of the rotating shaft 11, and a sliding seal is established between the sliding sleeve 34 and the rotating shaft 11 by arranging a sealing ring 341. The end of the sliding sleeve 34 extends towards the motor 1 and extends out of the bearing seat 3, and an annular iron block 342 is fixed to the end.

The pump body 2 is connected with a first water pipe 41 and a second water pipe 42 through a joint 23, wherein the position of the first water pipe 41 communicated with the pump body 2 is positioned at the water outlet 22, and the position of the second water pipe 42 communicated with the pump body 2 is positioned at the water suction port 21. The end part of the first water pipe 41 departing from the water outlet 22 is communicated to the bearing seat 3, particularly to one side of the water lubricating bearing 31 departing from the auxiliary impeller 33; the end of the second water pipe 42 facing away from the water suction port 21 is also communicated to the bearing seat 3, in particular to a water outlet 322 of the auxiliary cavity 32.

And a first rotary sealing piece 5 and a second rotary sealing piece 6 are also arranged in the bearing seat 3. The first rotary sealing element 5 comprises a leather cup 51, a movable ring 52 and a stationary ring 53, wherein the movable ring 52 is sleeved and fixed on the outer wall of the sliding sleeve 34, and a seal is established between the movable ring 52 and the sliding sleeve 34. The leather cup 51 is cylindrical, the leather cup 51 surrounds the sliding sleeve 34 but does not contact the sliding sleeve 34, the sizes of two ends of the leather cup 51 are different, and the leather cup 51 can stretch along the axial direction of the leather cup. The big end of the leather cup 51 is fixedly sealed with the bearing seat 3, the small end of the leather cup 51 is fixedly sealed with the static ring 53, and the movable ring 52 and the static ring 53 are abutted through the end faces. The materials of the movable ring 52 and the static ring 53 are respectively ceramic and graphite, and a rotary seal is established between the movable ring 52 and the static ring 53; the spring 511 is embedded in the leather cup 51, the spiral axis of the spring 511 is overlapped with the axis of the leather cup 51, the leather cup 51 has elasticity due to the materials of the spring 511 and the leather cup 51, the static ring 53 is driven by the elasticity of the leather cup 51 to tightly abut against the dynamic ring 52, and meanwhile, the auxiliary impeller 33 is located at the position close to the limit position of the water lubrication bearing 31. The rotary seal member one 5 establishes a rotary seal between the bearing housing 3 and the rotary shaft 11.

The second rotary sealing element 6 is positioned on one side of the water lubrication bearing 31 facing the working impeller 20, and the second rotary sealing element 6 establishes rotary sealing between the bearing seat 3 and the rotating shaft 11. The second rotary sealing element 6 adopts a conventional mechanical seal, and the second rotary sealing element 6 is used for preventing the water pressure of the pump cavity in the center of the pump body 2 from influencing the water lubrication bearing 31.

The shell of the motor 1 is fixed with an electromagnet 12, the electromagnet 12 is positioned between the motor 1 and the sliding sleeve 34, the electromagnet 12 is annular and surrounds the rotating shaft 11, and the electromagnet 12 is opposite to the iron block 342. Referring to fig. 2 and 3, the motor 1 has a high speed switch and a low speed switch for adjusting the rotation speed, and the high speed state and the low speed state (high and low here refer to relative high and low) of the motor 1 are switched correspondingly, the power supply of the electromagnet 12 is connected in parallel with the power supply of the motor 1, the switch of the electromagnet 12 is linked with the high speed switch, and the linked mode adopts a double-pole single-throw switch, namely, the power supply of the electromagnet 12 is switched on after the high speed switch is switched on, and the power supply of the electromagnet 12 is switched off after the high speed switch is switched off. After the electromagnet 12 is electrified, magnetic force is generated to attract the iron block 342, and the iron block 342 drives the sliding sleeve 34 and the auxiliary impeller 33 to move towards the direction far away from the water lubrication bearing 31.

The implementation principle of a water lubrication centrifugal pump of this application embodiment does: referring to fig. 1 and 2, when the motor 1 is in a low-speed state, the electromagnet 12 is not electrified, and under the action of the elastic force of the leather cup 51, the auxiliary impeller 33 is positioned at a limit position close to the water lubrication bearing 31, and the auxiliary impeller 33 can rotate at the position to reliably pump water. On the one hand, the water pressure of the water outlet 22 is higher than that of the water suction port 21, water flows through the first water passage pipe 41, the bearing housing 3 and the second water passage pipe 42, and the water passes through the water lubrication bearing 31 to lubricate and dissipate the heat, but the water flow amount in this state may be insufficient. On the other hand, the auxiliary impeller 33 rotates along with the rotating shaft 11, the auxiliary cavity 32 generates suction at the water inlet 321, and water flows along the water inlet 321, the auxiliary cavity 32 and the water outlet 322, so that the water flow and the flow speed of the water passing through the water lubricated bearing 31 are improved, and the efficient heat dissipation and lubrication effects are achieved for the water lubricated bearing 31. And the water pumping function of the rotation of the auxiliary impeller 33 can suck out impurities in the water lubrication bearing 31, so that the service life of the water lubrication bearing 31 is prolonged.

When the motor 1 is in a high speed state, on the one hand, the pressure difference between the water discharge port 22 and the water suction port 21 increases, and the flow of water through the water-lubricated bearing 31 is sufficient and may be excessive, possibly adversely affecting the seals. At this time, the electromagnet 12 is energized, the electromagnet 12 attracts the iron block 342, so that the auxiliary impeller 33 moves in the direction away from the water lubricated bearing 31, after the end surface of the auxiliary impeller 33 is away from the water inlet 321 and the side wall of the auxiliary impeller 33 deviates from the water outlet 322, the rotation of the auxiliary impeller 33 does not generate a pumping effect, but stirs the water in the auxiliary cavity 32, and generates flow resistance to the water passing through the auxiliary cavity 32, thereby reducing the water flow passing through the water lubricated bearing 31, meeting the heat dissipation and lubrication requirements, and not easily generating burden to each seal. After the auxiliary impeller 33 moves, the leather cup 51 deforms to enable the sliding sleeve 34 to move towards the electromagnet 12, and the abutting force of the movable ring 52 and the static ring 53 is further increased, so that the sealing effect of the rotary sealing element I5 is ensured.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. A water lubrication centrifugal pump comprises a motor (1), a pump body (2), a rotating shaft (11) and a working impeller (20), the pump body (2) comprises a water suction port (21) and a water discharge port (22), the rotating shaft (11) is driven by the motor (1) to rotate, the working impeller (20) is positioned in the pump body (2) and is fixed with the rotating shaft (11), a bearing seat (3) is fixed on the pump body (2), a water lubricating bearing (31) and a rotary sealing piece I (5) are arranged between the bearing seat (3) and the rotary shaft (11), the water lubricating bearing (31) is rotatably connected between the bearing seat (3) and the rotating shaft (11), the first rotary sealing piece (5) is positioned on one side of the water lubrication bearing (31) far away from the working impeller (20), the rotary sealing piece I (5) establishes rotary sealing between the bearing seat (3) and the rotating shaft (11); the method is characterized in that:

the pump body (2) is connected with a first water pipe (41) and a second water pipe (42), one end of the first water pipe (41) is communicated with the water outlet (22), one end of the second water pipe (42) is communicated with the water suction port (21), the other ends of the first water pipe (41) and the second water pipe (42) are respectively communicated with two ends of the water lubricating bearing (31), the rotating shaft (11) is coaxially fixed with an auxiliary impeller (33), the bearing seat (3) is provided with an auxiliary cavity (32) for the rotation of the auxiliary impeller (33), the auxiliary impeller (33) is positioned between the water lubricating bearing (31) and the rotary sealing piece I (5), the bearing seat (3) is provided with a water inlet (321) and a water outlet (322), the end part of the auxiliary cavity (32) is communicated with the water lubricating bearing (31) through the water inlet (321), and the side wall of the auxiliary cavity (32) is communicated with the second water pipe (42) through the water outlet (322), when the auxiliary impeller (33) rotates, water is driven to circulate along the water inlet (321) and the water outlet (322).

2. A water lubricated centrifugal pump according to claim 1, wherein: assist impeller (33) and slide and set up on pivot (11), assist between impeller (33) and pivot (11) and establish sliding connection through the keyway structure, assist impeller (33) and be fixed with sliding sleeve (34), outside sliding sleeve (34) extend bearing frame (3), it is located between sliding sleeve (34), bearing frame (3) to rotate sealing member (5), set up sliding seal between sliding sleeve (34) and pivot (11).

3. A water lubricated centrifugal pump according to claim 2, wherein: the end part of the sliding sleeve (34) departing from the bearing seat (3) is provided with an iron block (342), the shell of the motor (1) is fixed with an electromagnet (12), and the electromagnet (12) is opposite to the iron block (342).

4. A water lubricated centrifugal pump according to claim 3, wherein: the motor (1) is provided with a high-rotation-speed switch and a low-rotation-speed switch which are used for adjusting the rotation speed, the switch of the electromagnet (12) is linked with the high-rotation-speed switch, and the switch of the electromagnet (12) is switched on simultaneously when the high-rotation-speed switch is switched on.

5. A water lubricated centrifugal pump according to claim 2, wherein: rotating seal spare (5) includes leather cup (51), rotating ring (52), quiet ring (53), the outer wall that is fixed in sliding sleeve (34) is established to rotating ring (52) cover, leather cup (51) lantern ring winds outside pivot (11), the one end and bearing frame (3) fixed seal of leather cup (51), the other end and the quiet ring (53) fixed seal of leather cup (51), rotating ring (52), quiet ring (53) are through the terminal surface counterbalance, leather cup (51) have elasticity, the elasticity of leather cup (51) is driven quiet ring (53) and is supported tight rotating ring (52).

6. A water lubricated centrifugal pump according to claim 5, wherein: a spring (511) is embedded in the leather cup (51), and the spiral axis of the spring (511) is overlapped with the axis of the leather cup (51).

7. A water lubricated centrifugal pump according to claim 1, wherein: be equipped with between bearing frame (3) and pivot (11) and rotate sealing member two (6), it is located one side of water lubricated bearing (31) orientation work impeller (20) to rotate sealing member two (6), it establishes rotary seal between bearing frame (3), pivot (11) to rotate sealing member two (6).

8. A water lubricated centrifugal pump according to claim 1, wherein: the first water passing pipe (41) and the second water passing pipe (42) are connected with the pump body (2) through the joint (23).