CN112502985A

CN112502985A - Combined low-cavitation multistage centrifugal pump

Info

Publication number: CN112502985A
Application number: CN202011362838.7A
Authority: CN
Inventors: 梁忠于
Original assignee: Hangzhou Yueyan Industrial Design Co ltd
Current assignee: Hangzhou Yueyan Industrial Design Co ltd
Priority date: 2020-11-28
Filing date: 2020-11-28
Publication date: 2021-03-16

Abstract

The invention discloses a combined type low-cavitation multistage centrifugal pump, wherein a first guide pipe is fixedly communicated with the surface of a box body, one end of the first guide pipe is fixedly communicated with a second guide pipe, the second guide pipe penetrates through the inner wall of the box body and is fixedly communicated with a first shell, a first protection box is fixedly arranged at the top of the first shell, a first motor is fixedly arranged on the inner wall of the first protection box, a first rotating shaft is fixedly arranged on the output shaft of the first motor, a shaft sleeve is fixedly arranged on the surface of the first rotating shaft, a first impeller is sleeved on the outer side of the shaft sleeve, the device is provided with two groups of centrifugal pumps, multistage combination is realized, the working intensity of a single centrifugal pump is reduced to a certain degree, and the device is also provided with a fan, an air inlet and an air outlet, can discharge heat generated by the centrifugal pump and the motor and protect the motor and the centrifugal, the service life of the motor and the centrifugal pump can be prolonged to a certain extent.

Description

Combined low-cavitation multistage centrifugal pump

Technical Field

The invention belongs to the technical field of combined low-cavitation multistage centrifugal pumps, and particularly relates to a combined low-cavitation multistage centrifugal pump.

Background

The multistage centrifugal pump integrates more than two centrifugal pumps with the same function, and the fluid channel structure is characterized in that a medium pressure relief opening of a first stage is communicated with an inlet of a second stage, and a medium pressure relief opening of the second stage is communicated with an inlet of a third stage, so that the multistage centrifugal pump is formed by a mechanism connected in series. The multistage centrifugal pump adopts a high-efficiency energy-saving hydraulic model recommended by China, and has the advantages of high efficiency, energy conservation, wide performance range, safe and stable operation, low noise, long service life, convenience in installation and maintenance and the like; by changing the material and sealing form of the pump and adding a cooling system, hot water, oil, corrosive and abrasive-containing media and the like can be conveyed.

The centrifugal pump is used as a general machine and is widely applied to various fields of national economy such as electric power, petroleum, chemical engineering and the like. The condenser system of the thermal power (thermal power) generator set is used for conveying condensed water, and certain devices in the field of petrochemical industry have extremely strict requirements on the working condition of the pump due to the limited installation position. The pump inlet is in a vacuum (negative pressure) state or approximate saturated steam pressure working condition, so that the pump is required to have good cavitation resistance, and high lift is output according to the working condition requirement.

Most of the existing centrifugal pumps work by adopting single-stage centrifugal pumps, so that the work efficiency is reduced, and the working strength of the centrifugal pumps is increased, so that the service life of the centrifugal pumps is reduced to a certain extent, and the centrifugal pumps can generate heat in long-term work, and the heat can influence the service life of the centrifugal pumps and the motor.

Therefore, a combined low-cavitation multistage centrifugal pump is provided to solve the problems in the prior art.

Disclosure of Invention

The invention aims to provide a combined low-cavitation multistage centrifugal pump, which is provided with two groups of centrifugal pumps to realize multistage combination, so that the work lightness of a single centrifugal pump is reduced to a certain degree, and the combined low-cavitation multistage centrifugal pump is also provided with a fan, an air inlet and an air outlet, can discharge heat generated by the centrifugal pump and a motor, protects the motor and the centrifugal pump, can prolong the service lives of the motor and the centrifugal pump to a certain degree, and solves the problems in the background technology.

In order to achieve the purpose, the invention adopts the following technical scheme: a combined type low-cavitation multistage centrifugal pump comprises a box body, wherein a first guide pipe is fixedly communicated with the surface of the box body, one end of the first guide pipe is fixedly communicated with a second guide pipe, the second guide pipe penetrates through the inner wall of the box body and is fixedly communicated with a first shell, a first protection box is fixedly installed at the top of the first shell, a first motor is fixedly installed on the inner wall of the first protection box, a first rotating shaft is fixedly installed at the output shaft end of the first motor, a shaft sleeve is fixedly installed on the surface of the first rotating shaft, a first impeller is sleeved on the outer side of the shaft sleeve, a first fluid director is sleeved on the surface of the first impeller, a third guide pipe is fixedly communicated with one side of the first shell, a pipeline is fixedly communicated with one end of the third guide pipe, which is far away from the first shell, a fourth guide pipe is fixedly communicated with one side of the pipeline, and one end of the fourth guide pipe, the improved fan box is characterized in that a second protection box is fixedly mounted at the top of the second shell, a second motor is fixedly mounted on the inner wall of the second protection box, a second rotating shaft is fixedly mounted at the output end of the second motor, a shaft sleeve is fixedly mounted on the surface of the second rotating shaft, a second impeller is sleeved on the outer side of the shaft sleeve, a second fluid director is sleeved on the surface of the second impeller, a fifth conduit is fixedly communicated with one side of the second shell and runs through the outer wall of the box body and is fixedly connected with a sixth conduit, and a fan is fixedly mounted on the surface of the box body.

Preferably, the first support is fixedly mounted at the bottom of the first shell, the first base is fixedly mounted at the bottom of the first support, and the first base is fixedly mounted on the inner wall of the box body.

Preferably, a second support is fixedly mounted at the bottom of the second shell, a second base is fixedly mounted at the bottom of the second support, and the second base is also fixedly mounted on the inner wall of the box body.

Preferably, the surface of the box body is provided with a first through hole, the fan is fixedly installed inside the first through hole, and the surface of the box body is fixedly provided with a protective net at the installation position of the fan.

Preferably, the air inlets are formed in one sides of the surfaces of the first protection box and the second protection box, and the air outlets are formed in the other sides of the surfaces of the first protection box and the second protection box.

Preferably, the rotating joints of the first rotating shaft and the second rotating shaft, the first shell and the second shell are fixedly provided with bearings.

Preferably, the first guide pipe and the second guide pipe, and the fifth guide pipe and the sixth guide pipe are fixedly connected through flanges.

Preferably, a second through hole is formed in the middle of each of the first fluid director and the second fluid director, and the shaft sleeve is fixedly installed inside the second through hole.

Preferably, the surfaces of the first impeller and the second impeller are both provided with grooves, and the shaft sleeve is fixedly arranged in the grooves.

The invention has the technical effects and advantages that: compared with the prior art, the combined low-cavitation multistage centrifugal pump provided by the invention has the following advantages:

the device installs two sets of centrifugal pumps, realizes multistage combination, has just so reduced single centrifugal pump work slightly to a certain extent, and the device still is provided with fan, air intake and air outlet moreover, can discharge the heat that centrifugal pump and motor produced, protects motor and centrifugal pump, can improve the life of motor and centrifugal pump to a certain extent.

Drawings

FIG. 1 is a schematic sectional elevational view of a combination low-cavitation multistage centrifugal pump of the present invention;

FIG. 2 is a schematic view of a combined low cavitation multistage centrifugal pump according to the present invention;

FIG. 3 is a schematic view of a combined low cavitation multistage centrifugal pump according to the present invention;

FIG. 4 is a schematic view of a combined low cavitation multistage centrifugal pump according to the present invention;

fig. 5 is a schematic structural view of a combined low cavitation multistage centrifugal pump of the present invention.

In the figure: 1. a box body; 2. a first conduit; 3. a second conduit; 4. a first housing; 5. a first protective box; 6. a first motor; 7. a first rotating shaft; 8. a shaft sleeve; 9. a first impeller; 10. a first flow director; 11. a third conduit; 12. a pipeline; 13. a fourth conduit; 14. a second housing; 15. a second protective box; 16. a second motor; 17. a second rotating shaft; 18. a second impeller; 19. a second flow director; 20. a fifth conduit; 21. a sixth conduit; 22. a fan; 23. a first bracket; 24. a first base; 25. a second bracket; 26. a second base; 27. a first through hole; 28. a protective net; 29. an air inlet; 30. an air outlet; 31. a bearing; 32. a flange; 33. a second through hole; 34. and (4) a groove.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. The specific embodiments described herein are merely illustrative of the invention and do not delimit the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The invention provides a technical scheme as shown in figures 1-5: a combined type low-cavitation multistage centrifugal pump comprises a box body 1, a first conduit 2 is fixedly communicated with the surface of the box body 1, the first conduit 2 is arranged for conveying external liquid, one end of the first conduit 2 is fixedly communicated with a second conduit 3, the second conduit 3 is arranged for conveying the external liquid into a first shell 4, the second conduit 3 penetrates through the inner wall of the box body 1 and is fixedly communicated with a first shell 4, the first shell 4 is arranged for protecting the liquid and preventing the liquid from leaking, a first bracket 23 is fixedly arranged at the bottom of the first shell 4, the first bracket 23 is arranged for supporting the first shell 4, a first base 24 is fixedly arranged at the bottom of the first bracket 23, the first base 24 is arranged for fixing the first shell 4 in the box body 1 and preventing the first shell 4 from loosening, the first base 24 is fixedly arranged at the inner wall of the box body 1, a first protection box 5 is fixedly arranged at the top of the first shell 4, the first protection box 5 is arranged for fixing the first motor 6 while protecting the first motor 6, the first motor 6 is fixedly arranged on the inner wall of the first protection box 5, the first motor 6 is arranged for driving the first rotating shaft 7 to rotate, the first rotating shaft 7 is fixedly arranged at the output shaft end of the first motor 6, the first rotating shaft 7 is arranged for fixing the shaft sleeve 8, the first impeller 9 and the first fluid director 10, the surface of the first rotating shaft 7 is fixedly provided with the shaft sleeve 8, the shaft sleeve 8 is arranged for reducing the friction force between the first impeller 9, the first fluid director 10 and the first rotating shaft 7, the first impeller 9 is sleeved outside the shaft sleeve 8, the first impeller 9 is arranged for installing blades and transmitting the torque generated by the steam flow force on a blade grid to the first rotating shaft 7, the first fluid director 10 is sleeved on the surface of the first impeller 9, and the first fluid director 10 is arranged for ensuring that the air flow and the water flow enter the first impeller 9, a third conduit 11 is fixedly communicated with one side of the first casing 4, the third conduit 11 is arranged to convey the liquid in the first casing 4 out of the first casing 4, a pipeline 12 is fixedly communicated with one end of the third conduit 11 far away from the first casing 4, and the pipeline 12 is arranged to connect the third conduit 11 with a fourth conduit 13.

A fourth conduit 13 is fixedly communicated with one side of the surface of the pipeline 12, the fourth conduit 13 is arranged to convey the liquid entering the pipeline 12 from the first shell 4 into the second shell 14, one end of the fourth conduit 13, which is far away from the pipeline 12, is fixedly communicated with the second shell 14, a second bracket 25 is fixedly arranged at the bottom of the second shell 14, the second bracket 25 is arranged to support the second shell 14, a second base 26 is fixedly arranged at the bottom of the second bracket 25, the second base 26 is arranged to fix the second shell 14 in the box body 1 and prevent the second shell 14 from loosening, the second base 26 is also fixedly arranged on the inner wall of the box body 1, a second protection box 15 is fixedly arranged at the top of the second shell 14, the second protection box 15 is arranged to fix the second motor 16 while protecting the second motor 16, air inlets 29 are respectively arranged at one side of the surfaces of the first protection box 5 and the second protection box 15, the air inlet 29 is arranged to inject outside air into the first protection box 5 and the second protection box 15, the air outlet 30 is arranged on the other side of the surface of the first protection box 5 and the other side of the surface of the second protection box 15, the air outlet 30 is arranged to exhaust hot air in the first protection box 5 and the second protection box 15, the inner wall of the second protection box 15 is fixedly provided with the second motor 16, the second motor 16 is arranged to drive the second rotating shaft 17 to rotate, the output shaft of the second motor 16 is fixedly provided with the second rotating shaft 17, the second rotating shaft 17 is arranged to fix the shaft sleeve 8, the second impeller 18 and the second fluid director 19, bearings 31 are fixedly arranged at the rotating connection positions of the first rotating shaft 7, the second rotating shaft 17, the first shell 4 and the second shell 14, and the bearings 31 are arranged to facilitate the rotation of the first rotating shaft 7 and the second rotating shaft 17 and reduce the friction coefficient of the first rotating shaft 7 and the second rotating shaft 17 in the moving process, and the rotation precision of the first rotating shaft 7 and the second rotating shaft 17 is ensured, the surface of the second rotating shaft 17 is fixedly provided with a shaft sleeve 8, the outer side of the shaft sleeve 8 is sleeved with a second impeller 18, the second impeller 18 is arranged for installing blades and transmitting the torque generated by the steam force on a blade grid to the second rotating shaft 17, the surfaces of the first impeller 9 and the second impeller 18 are respectively provided with a groove 34, the groove 34 is arranged for placing the shaft sleeve 8 and preventing the shaft sleeve 8 from sliding off, the shaft sleeve 8 is fixedly arranged in the groove 34, the surface of the second impeller 18 is sleeved with a second fluid director 19, the second fluid director 19 is arranged for ensuring that the air flow and the water flow enter the second impeller 18, the middle positions of the first fluid director 10 and the second fluid director 19 are respectively provided with a second through hole 33, the second through hole 33 is arranged for placing the shaft sleeve 8, the shaft sleeve 8 is fixedly arranged in the second through hole 33, one side of the second shell 14 is fixedly communicated with, the fifth pipe 20 is provided to discharge the liquid in the second casing 14, the fifth pipe 20 penetrates the outer wall of the casing 1 and is fixedly connected to a sixth pipe 21, and the sixth pipe 21 is provided to discharge the liquid in the casing 1.

The first guide pipe 2 and the second guide pipe 3, and the fifth guide pipe 20 and the sixth guide pipe 21 are fixedly connected through flanges 32, the flanges 32 are provided for fixedly connecting the first guide pipe 2 and the second guide pipe 3, and the fifth guide pipe 20 and the sixth guide pipe 21, meanwhile, the first guide pipe 2 and the second guide pipe 3, and the fifth guide pipe 20 and the sixth guide pipe 21 are convenient to disassemble and replace, the surface of the box body 1 is fixedly provided with a fan 22, the fan 22 is arranged for discharging the heat generated by the two groups of centrifugal pumps out of the box body 1, the heat dissipation is performed inside the box body 1, the first through hole 27 is formed in the surface of the box body 1, the first through hole 27 is formed for fixedly mounting the fan 22, the fan 22 is fixedly mounted inside the first through hole 27, the protective net 28 is fixedly mounted on the surface of the box body 1 at the mounting position of the fan 22, and the protective net 28 is arranged for protecting the fan 22 and protecting workers.

The working principle is as follows: when in use, a user fixes the shaft sleeve 8, the first impeller 9 and the first fluid director 10 on the surface of the first rotating shaft 7, fixes the shaft sleeve 8, the second impeller 18 and the second fluid director 19 on the surface of the second rotating shaft 17, then connects the first shell 4 and the second shell 14 with the fourth conduit 13 through the third conduit 11 and the pipeline 12, then simultaneously starts the first motor 6 and the second motor 16, the first motor 6 and the second motor 16 respectively drive the first rotating shaft 7 and the second rotating shaft 17 to rotate, thereby realizing that the first impeller 9, the first fluid director 10, the second impeller 18 and the second fluid director 19 rotate, then conveys outside liquid into the first shell 4 through the first conduit 2 and the second conduit 3, the first motor 6 drives the shaft sleeve 8, the first impeller 9 and the first fluid director 10 to rotate through the first rotating shaft 7, generates centrifugal force to generate action on the liquid, drives the centrifugal force to rise, liquid is discharged into a pipeline 12 through a third conduit 11, then the liquid enters a second shell 14 through a fourth conduit 13, a second motor 16 drives a shaft sleeve 8, a second impeller 18 and a second fluid director 19 to rotate through a second rotating shaft 17 to generate centrifugal force, the centrifugal force acts on the liquid to drive the liquid to ascend, then the liquid is discharged out of the box body 1 through a fifth conduit 20 and is conveyed into a container through a sixth conduit 21, heat generated in the working process of the first motor 6 and the second motor 16 is discharged through an air outlet 30, the first protection box 5 and the second protection box 15 realize air circulation under the action of an air inlet 29 and an air outlet 30, the first motor 6 and the second motor 16 are further cooled, then a fan 22 is started, and the fan 22 pumps out hot air in the box body 1 to realize cooling of the two groups of centrifugal pumps.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the invention.

Claims

1. The utility model provides a modular low cavitation multistage centrifugal pump, including box (1), its characterized in that: the surface of the box body (1) is fixedly communicated with a first conduit (2), one end of the first conduit (2) is fixedly communicated with a second conduit (3), the second conduit (3) penetrates through the inner wall of the box body (1) and is fixedly communicated with a first shell (4), the top of the first shell (4) is fixedly provided with a first protection box (5), the inner wall of the first protection box (5) is fixedly provided with a first motor (6), the output shaft end of the first motor (6) is fixedly provided with a first rotating shaft (7), the surface of the first rotating shaft (7) is fixedly provided with a shaft sleeve (8), the outer side of the shaft sleeve (8) is sleeved with a first impeller (9), the surface of the first impeller (9) is sleeved with a first fluid director (10), one side of the first shell (4) is fixedly communicated with a third conduit (11), one end of the third conduit (11) far away from the first shell (4) is fixedly communicated with a pipeline (12), a fourth conduit (13) is fixedly communicated with one side of the surface of the pipeline (12), one end of the fourth conduit (13) far away from the pipeline (12) is fixedly communicated with a second shell (14), a second protection box (15) is fixedly arranged at the top of the second shell (14), a second motor (16) is fixedly arranged on the inner wall of the second protection box (15), a second rotating shaft (17) is fixedly arranged at the output shaft end of the second motor (16), the surface of the second rotating shaft (17) is fixedly provided with a shaft sleeve (8), the outer side of the shaft sleeve (8) is sleeved with a second impeller (18), a second fluid director (19) is sleeved on the surface of the second impeller (18), a fifth conduit (20) is fixedly communicated with one side of the second shell (14), the fifth guide pipe (20) penetrates through the outer wall of the box body (1) and is fixedly connected with a sixth guide pipe (21), and a fan (22) is fixedly mounted on the surface of the box body (1).

2. A combined low-cavitation multistage centrifugal pump according to claim 1, characterized in that: first casing (4) bottom fixed mounting has first support (23), first support (23) bottom fixed mounting has first base (24), first base (24) fixed mounting is in box (1) inner wall.

3. A combined low-cavitation multistage centrifugal pump according to claim 1, characterized in that: the bottom of the second shell (14) is fixedly provided with a second support (25), the bottom of the second support (25) is fixedly provided with a second base (26), and the second base (26) is also fixedly arranged on the inner wall of the box body (1).

4. A combined low-cavitation multistage centrifugal pump according to claim 1, characterized in that: first through-hole (27) have been seted up on box (1) surface, fan (22) fixed mounting is inside first through-hole (27), box (1) surface is located fan (22) mounted position fixed mounting has protection network (28).

5. A combined low-cavitation multistage centrifugal pump according to claim 1, characterized in that: air inlets (29) are formed in one sides of the surfaces of the first protection box (5) and the second protection box (15), and air outlets (30) are formed in the other sides of the surfaces of the first protection box (5) and the second protection box (15).

6. A combined low-cavitation multistage centrifugal pump according to claim 1, characterized in that: and bearings (31) are fixedly arranged at the rotating connection positions of the first rotating shaft (7) and the second rotating shaft (17) and the first shell (4) and the second shell (14).

7. A combined low-cavitation multistage centrifugal pump according to claim 1, characterized in that: the first guide pipe (2) is fixedly connected with the second guide pipe (3), and the fifth guide pipe (20) is fixedly connected with the sixth guide pipe (21) through flanges (32).

8. A combined low-cavitation multistage centrifugal pump according to claim 1, characterized in that: second through holes (33) are formed in the middle positions of the first fluid director (10) and the second fluid director (19), and the shaft sleeve (8) is fixedly installed inside the second through holes (33).

9. A combined low-cavitation multistage centrifugal pump according to claim 1, characterized in that: the surfaces of the first impeller (9) and the second impeller (18) are respectively provided with a groove (34), and the shaft sleeve (8) is fixedly arranged in the groove (34).