CN109469631B

CN109469631B - Centrifugal pump body

Info

Publication number: CN109469631B
Application number: CN201811242511.9A
Authority: CN
Inventors: 陈旭英; 斯建明; 陈雪波
Original assignee: Zhejiang Langqing Intelligent Technology Co ltd
Current assignee: Zhejiang Langqing Intelligent Technology Co ltd
Priority date: 2018-10-24
Filing date: 2018-10-24
Publication date: 2020-07-07
Anticipated expiration: 2038-10-24
Also published as: CN109469631A

Abstract

The invention belongs to the technical field of centrifugal pump bodies, and particularly relates to a centrifugal pump body which comprises an impeller device, a liquid outlet pipe and the like, wherein a liquid inlet pipe and a liquid outlet pipe are arranged on a pump shell; the centrifugal pump body is provided with a first impeller and a second impeller, two external threads are arranged on a driving shaft, and the first impeller and the second impeller are symmetrically distributed, so that axial forces exerted on the first impeller and the second impeller are opposite, when the first impeller and the second impeller move, a first nut moves together and forms threaded transmission with the external threads on the driving shaft, the mounting position of the first nut relative to a second nut is changed, the solution flow at the inlet of the first impeller or the second impeller is changed, the axial forces exerted on the first impeller and the second impeller are the same in magnitude and opposite in direction, and the purpose of offsetting the axial forces exerted on the first impeller and the second impeller is achieved.

Description

Centrifugal pump body

Technical Field

The invention belongs to the technical field of centrifugal pump bodies, and particularly relates to a centrifugal pump body.

Background

The impeller of the existing centrifugal pump always has an axial action towards the suction inlet of the pump, so that the impeller moves towards one side of the suction inlet along the axial direction, and the impeller is vibrated and abraded; meanwhile, the existence of the axial force can also seriously reduce the service life of the bearing, and extremely adverse effect is generated on the work of the centrifugal pump, so that the design of the centrifugal pump body is very necessary.

The invention designs a centrifugal pump body to solve the problems.

Disclosure of Invention

Technical problem to be solved by the invention

The invention provides a centrifugal pump body to overcome the problem that the impeller of the centrifugal pump body in the prior art has an axial action of always pointing to a suction inlet of a pump, so that the impeller moves to one side of the suction inlet along the axial direction, and the impeller is vibrated and abraded; and the existence of the axial force can seriously reduce the service life of the bearing.

(II) technical scheme of the invention

In order to solve the defects in the prior art, the invention discloses a centrifugal pump body which is realized by adopting the following technical scheme.

A centrifugal pump body characterized by: the impeller pump comprises an impeller device, a liquid outlet pipe, a liquid inlet pipe, a pump shell, a driving shaft and a partition plate, wherein the liquid inlet pipe and the liquid outlet pipe are arranged on the pump shell; a partition plate for dividing the inner cavity of the pump shell into a liquid inlet cavity and a liquid outlet cavity is arranged in the pump shell; the impeller device is arranged in the pump shell; a drive shaft connected to the drive device is inserted into the pump housing and the drive shaft penetrates into the impeller device to drive the impeller device into rotational movement.

The outer circular surface of the driving shaft is provided with two external threads, and the two external threads are in threaded fit with nuts in two impellers which are symmetrically distributed and arranged on the impeller device, so that when the impeller device axially moves under the action of axial force of solution, the nuts in the impellers are pulled to move axially relative to the driving shaft, the nuts in the impellers are in threaded transmission with the external threads on the driving shaft, the nuts in the impellers rotate for a certain angle, the nuts in the impellers and the nuts for fastening the impellers act together to change the flow of the solution entering the impeller device, and the purpose of weakening the axial force applied to the impeller device is achieved; the impeller of two symmetric distributions that set up on the impeller device, the impeller of one side is accelerated to the solution that comes in through the feed liquor pipe, and the solution after the impeller of this side accelerates in the impeller of opposite side flows in through the pipeline and accelerates the back through the drain pipe outflow pump case.

As a further optimization of the technology, the pump shell is also provided with a first shaft hole for supporting the driving shaft, and the first shaft hole and the driving shaft are installed in a matched mode through a shaft sleeve.

As a further optimization of the technology, the impeller device comprises a first impeller, a second impeller, a solution pipeline, a first fixing ring, a fixing plate, a first arc-shaped shell, a second arc-shaped shell, a first liquid outlet hole, a connecting ring, a second liquid outlet hole, a containing cavity, a cover plate, a spring mounting ring, a buffer spring, a second sealing device, a liquid inlet hole, a second shaft hole, a shaft shoulder, a moving sleeve, a limiting ring groove, a guide groove, a limiting ring, a guide block, a first nut, a second nut, a T-shaped ring, a first sealing device and a T-shaped ring groove, wherein a horn-shaped bulge is arranged at the center of the end face of one end of the first arc-shaped shell; a plurality of second liquid outlet holes are formed in the outer arc surface of the first arc-shaped shell; a horn-mouth-shaped bulge is arranged at the center of the end face of one end of the second arc-shaped shell; a plurality of first liquid outlet holes are formed in the outer arc surface of the second arc-shaped shell; the first arc-shaped shell and the second arc-shaped shell have the same shape and size; the first arc-shaped shell and the second arc-shaped shell are fixedly connected together through a connecting ring, and the horn-shaped bulges on the first arc-shaped shell and the second arc-shaped shell are distributed far away from the connecting ring; the inner circle surface of the connecting ring is provided with an accommodating cavity; one end of the first arc-shaped shell, which is provided with a horn-mouth-shaped bulge, is fixedly arranged on the end surface of the partition plate; a first fixing ring is fixedly arranged at one end of the second arc-shaped shell, which is provided with a horn-mouth-shaped bulge, and two fixing plates are symmetrically arranged on the outer circular surface of the first fixing ring; one end of the fixing plate, which is far away from the first fixing ring, is fixedly arranged on the wall surface of the inner cavity of the pump shell; a through second shaft hole is formed in the center of the end face of the cover plate; the cover plate is matched with the driving shaft through a first sealing device, and one end of the cover plate is fixedly arranged on the end face of the second arc-shaped shell; the end surface of the cover plate is provided with a liquid inlet hole corresponding to the plurality of second liquid outlet holes, and the liquid inlet hole is communicated with the second liquid outlet holes through a solution pipeline; two guide blocks are symmetrically arranged on the outer circular surface of the driving shaft; two guide grooves are symmetrically arranged on the inner circular surface of the sports sleeve; a limiting ring is arranged on the outer circular surface at the position of the motion sleeve guide groove; a limiting ring groove is formed in the inner circular surface of the spring mounting ring; the spring mounting ring is arranged outside the motion sleeve through the rotation fit of the limiting ring and the limiting ring groove; two shaft shoulders which have the positioning function on the first impeller and the second impeller are symmetrically arranged on the outer circular surface of the motion sleeve relative to the spring mounting ring; the moving sleeve is arranged on the driving shaft through the sliding fit of the guide groove and the guide block, and the spring mounting ring is positioned in the accommodating cavity; the inner circular surfaces at two sides of the accommodating cavity on the connecting ring are matched and arranged with the outer circular surface of the moving sleeve through a second sealing device; a plurality of groups of buffer springs are symmetrically distributed on two sides of the spring mounting ring, one end of each buffer spring is fixedly arranged on the end face of the spring mounting ring, and the other end of each buffer spring is fixedly arranged on the end face of the accommodating cavity; the first impeller and the second impeller are symmetrically arranged on the moving sleeve, the first impeller is positioned in the first arc-shaped shell, and the second impeller is positioned in the second arc-shaped shell; the first impeller, the second impeller and a shaft shoulder on the moving sleeve are in contact fit.

The first impeller and the second impeller are both provided with a first nut and a second nut, and the mounting directions of the first nut and the second nut at the first impeller and the first nut and the second nut at the second impeller are symmetrically distributed around the spring mounting ring; for the installation of the first nut and the second nut at the first impeller, the second nut fastens the first impeller on the moving sleeve through the threaded fit with the external thread on the moving sleeve; a T-shaped annular groove is formed in the end face of the second nut; a T-shaped ring is arranged in the T-shaped ring groove; one end of the first nut is fixedly arranged on the end face of the T-shaped ring, and the first nut is in threaded fit with the external thread on the driving shaft.

As a further optimization of the technology, the inner structures of the first impeller and the second impeller are completely the same, the mounting positions of the inner structures of the first impeller and the second impeller are symmetrically distributed about the spring mounting ring, the first impeller comprises a first fixed wheel, a second fixed wheel, blades and a boss, and the second fixed wheel is provided with a boss pressed by a second nut; a plurality of blades are uniformly arranged on the end surface of one end of the second fixed wheel, which is provided with a boss, in the circumferential direction; a horn-mouth-shaped bulge is arranged at the center of the end surface of one end of the first fixed wheel; the first fixed wheel is fixedly installed on the end faces of the blades without the horn-mouth-shaped protrusions, and the center of the end face of the first fixed wheel is provided with a through round hole.

As a further optimization of the technology, the second fixed wheel is in contact fit with the shaft shoulder; the second nut forms screw-thread fit with the external thread on the moving sleeve and is pressed on the boss.

As a further optimization of the technology, a horn-mouth-shaped bulge is arranged at the center of the end face of one end of the first fixed wheel in the first impeller and matched with a horn-mouth-shaped bulge arranged at the center of the end face of one end of the first arc-shaped shell; the end face center of one end of a first fixed wheel in the second impeller is provided with a horn-mouth-shaped bulge which is matched with the horn-mouth-shaped bulge arranged at the end face center of one end of the first arc-shaped shell.

As a further optimization of the present technology, the two external threads provided on the drive shaft are disposed at positions relative to the two first nuts in the first impeller and the second impeller, such that the two first nuts are located between the two external threads on the drive shaft.

As a further optimization of the present technology, the two external threads provided on the drive shaft are disposed at positions relative to the two first nuts in the first impeller and the second impeller, and the two first nuts are located outside the two external threads on the drive shaft.

(III) advantages and advantageous effects of the invention

Compared with the traditional centrifugal pump body technology, the centrifugal pump body provided by the invention is provided with the first impeller and the second impeller, the driving shaft is provided with two external threads, the first impeller and the second impeller are symmetrically distributed, so that the axial forces of the first impeller and the second impeller are opposite, the first impeller and the second impeller are both arranged on the moving sleeve, when the first impeller and the second impeller play, the first nut arranged on the first impeller and the second impeller move together, the first nut and the external threads on the driving shaft form thread transmission, the installation position of the first nut relative to the second nut is changed, the solution flow at the inlet of the first impeller or the second impeller is changed, the axial forces of the first impeller and the second impeller are changed, and the axial forces of the first impeller and the second impeller are the same in magnitude but opposite in direction, the purpose that the axial force applied to the impeller device can be counteracted is achieved.

Drawings

Fig. 1 is a schematic view of the overall component distribution.

Fig. 2 is a schematic view of an impeller device mounting structure.

Fig. 3 is a schematic view of a first impeller mounting structure.

FIG. 4 is a second impeller mounting configuration schematic.

Fig. 5 is a schematic view of a pump housing structure (i).

Fig. 6 is a schematic view of the pump casing structure (ii).

FIG. 7 is a schematic view of a diaphragm mounting structure.

Fig. 8 is a schematic view of a solution pipe installation structure.

Fig. 9 is a schematic view of a first fixing ring mounting structure.

Fig. 10 is a schematic view of a bushing mounting structure.

Fig. 11 is a schematic view of a first arcuate shell mounting arrangement.

Fig. 12 is a schematic view of a second arcuate shell mounting structure.

Fig. 13 is a schematic view of a second arcuate shell configuration.

Fig. 14 is a schematic view of a first arcuate shell configuration.

Fig. 15 is a schematic view of a cover plate mounting structure.

Fig. 16 is a schematic view of a damper spring mounting structure.

Fig. 17 is a schematic view of a cover plate structure.

FIG. 18 is a schematic view of a spring collar mounting arrangement.

Fig. 19 is a schematic view of a first nut mounting structure.

Fig. 20 is a schematic view of a spring mounting ring structure.

Fig. 21 is a schematic view of the structure of the sports sleeve.

Fig. 22 is a schematic view of a guide block mounting structure.

Fig. 23 is a schematic view of a first nut structure.

Fig. 24 is a schematic view of the mounting structure of the first nut and the second nut.

FIG. 25 is a schematic view of a T-ring mounting arrangement.

FIG. 26 is a schematic view of a blade mounting configuration.

Fig. 27 is a schematic view of a first fixed wheel structure.

FIG. 28 is a schematic view of a second fixed wheel and blade mounting arrangement.

Fig. 29 is a schematic view of a second fixed wheel structure.

Fig. 30 is a schematic solution flow diagram.

Fig. 31 is a schematic view of the first nut and the location of the external threads on the drive shaft.

Fig. 32 is a schematic view of the first nut and the position of the external thread on the drive shaft (two).

Fig. 33 is a schematic view of a second nut structure.

Number designation in the figures: 1. a liquid outlet pipe; 2. a liquid inlet pipe; 3. a pump housing; 4. a drive shaft; 5. a partition plate; 6. a first impeller; 7. a second impeller; 8. a first shaft hole; 9. a solution line; 10. a first retaining ring; 11. a fixing plate; 12. a shaft sleeve; 13. a first arcuate shell; 14. a second arcuate shell; 15. a first liquid outlet hole; 16. a connecting ring; 17. a second liquid outlet hole; 18. an accommodating chamber; 19. a cover plate; 20. a spring mounting ring; 21. a buffer spring; 22. a second sealing device; 23. a liquid inlet hole; 24. a second shaft hole; 25. a shaft shoulder; 26. a sports sleeve; 27. a limiting ring groove; 28. a guide groove; 29. a limiting ring; 30. a guide block; 31. a first nut; 32. a second nut; 33. a T-shaped ring; 34. a first fixed wheel; 35. a second fixed wheel; 36. a blade; 37. a boss; 38. a first sealing device; 39. a T-shaped ring groove; 40. an impeller device.

Detailed Description

The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.

As shown in fig. 1, 2 and 3, it comprises an impeller device 40, a liquid outlet pipe 1, a liquid inlet pipe 2, a pump shell 3, a driving shaft 4 and a partition plate 5, as shown in fig. 5, wherein the pump shell 3 is provided with the liquid inlet pipe 2 and the liquid outlet pipe 1; as shown in fig. 6 and 7, a partition plate 5 for dividing the cavity in the pump shell 3 into a liquid inlet cavity and a liquid outlet cavity is arranged in the pump shell 3; as shown in fig. 4, the impeller device 40 is mounted in the pump casing 3; a drive shaft 4 connected to the drive apparatus is inserted into the pump housing 3, and the drive shaft 4 penetrates into the impeller device 40 to bring about a rotational movement of the impeller device 40.

Two external threads are arranged on the outer circular surface of the driving shaft 4, and the two external threads are in threaded fit with nuts in two impellers which are symmetrically distributed and arranged on the impeller device 40, so that when the impeller device 40 axially moves under the action of axial force of a solution, the nuts in the impellers are pulled to axially move relative to the driving shaft 4, the nuts in the impellers are in threaded transmission with the external threads on the driving shaft 4, the nuts in the impellers rotate by a certain angle, the nuts in the impellers and the nuts for fastening the impellers act together to change the flow of the solution entering the impeller device 40, and the purpose of weakening the axial force applied to the impeller device 40 is achieved; the impeller device 40 is provided with two impellers which are symmetrically distributed, the impeller on one side accelerates the solution entering through the liquid inlet pipe 2, and the solution accelerated by the impeller on the side flows into the impeller on the other side through the pipeline to accelerate and then flows out of the pump shell 3 through the liquid outlet pipe 1.

As shown in fig. 5, the pump housing 3 is further provided with a first shaft hole 8 for supporting the driving shaft 4, and the first shaft hole 8 and the driving shaft 4 are installed by a sleeve 12.

As shown in fig. 8, the impeller device 40 includes a first impeller 6, a second impeller 7, a solution pipeline 9, a first fixing ring 10, a fixing plate 11, a first arc-shaped shell 13, a second arc-shaped shell 14, a first liquid outlet hole 15, a connecting ring 16, a second liquid outlet hole 17, a containing cavity 18, a cover plate 19, a spring mounting ring 20, a buffer spring 21, a second sealing device 22, a liquid inlet hole 23, a second shaft hole 24, a shaft shoulder 25, a moving sleeve 26, a limit ring groove 27, a guide groove 28, a limit ring 29, a guide block 30, a first nut 31, a second nut 32, a T-shaped ring 33, a first sealing device 38 and a T-shaped ring groove 39, as shown in fig. 11, 12 and 13, wherein a bell-mouth-shaped protrusion is arranged at the center of an end face of one end of the first arc-shaped shell 13; as shown in fig. 14, a plurality of second liquid outlet holes 17 are formed on the outer arc surface of the first arc-shaped shell 13; as shown in fig. 12, a flared protrusion is provided at the center of the end surface of one end of the second arc-shaped shell 14; a plurality of first liquid outlet holes 15 are formed in the outer arc surface of the second arc-shaped shell 14; as shown in fig. 13, the first arc shell 13 and the second arc shell 14 have the same shape and size; as shown in fig. 12, the first arc-shaped shell 13 and the second arc-shaped shell 14 are fixedly connected together through a connecting ring 16, and the flared protrusions on the first arc-shaped shell 13 and the second arc-shaped shell 14 are distributed away from the connecting ring 16; as shown in fig. 13, the connecting ring 16 has a receiving cavity 18 formed on the inner circumferential surface thereof; one end of the first arc-shaped shell 13, which is provided with a horn-shaped bulge, is fixedly arranged on the end surface of the partition plate 5; as shown in fig. 8 and 9, the first fixing ring 10 is fixedly mounted at one end of the second arc-shaped shell 14 having the flared protrusion, as shown in fig. 9, and two fixing plates 11 are symmetrically mounted on the outer circumferential surface of the first fixing ring 10; one end of the fixing plate 11, which is far away from the first fixing ring 10, is fixedly arranged on the wall surface of the inner cavity of the pump shell 3; as shown in fig. 17, a second shaft hole 24 is formed through the center of the end surface of the cover plate 19; the cover plate 19 is matched with the driving shaft 4 through a first sealing device 38, and one end of the cover plate 19 is fixedly arranged on the end face of the second arc-shaped shell 14; as shown in fig. 17, the end surface of the cover plate 19 is provided with a liquid inlet hole 23 corresponding to the plurality of second liquid outlet holes 17, and the liquid inlet hole 23 is communicated with the second liquid outlet holes 17 through a solution pipeline 9; as shown in fig. 22 and 23, two guide shoes 30 are symmetrically mounted on the outer circumferential surface of the driving shaft 4; as shown in fig. 21, two guide grooves 28 are symmetrically formed on the inner circular surface of the moving sleeve 26; as shown in fig. 21, a limiting ring 29 is arranged on the outer circular surface of the motion sleeve 26 at the position of the guide groove 28; as shown in FIG. 20, the spring mounting ring 20 has a limiting ring groove 27 formed on the inner circumferential surface thereof; as shown in fig. 19, the spring mounting ring 20 is mounted outside the moving sleeve 26 through the rotation fit of the limiting ring 29 and the limiting ring groove 27; as shown in fig. 15 and 16, two shoulders 25 for positioning the first impeller 6 and the second impeller 7 are symmetrically arranged on the outer circular surface of the moving sleeve 26 with respect to the spring mounting ring 20; as shown in fig. 19, the moving sleeve 26 is mounted on the drive shaft 4 by the sliding fit of the guide slot 28 and the guide block 30, and the spring mounting ring 20 is located in the housing chamber 18; the inner circular surfaces at both sides of the accommodating cavity 18 on the connecting ring 16 are matched and arranged with the outer circular surface of the moving sleeve 26 through a second sealing device 22; a plurality of groups of buffer springs 21 are symmetrically distributed on two sides of the spring mounting ring 20, one end of each buffer spring 21 is fixedly arranged on the end face of the spring mounting ring 20, and the other end of each buffer spring 21 is fixedly arranged on the end face of the accommodating cavity 18; as shown in fig. 10, the first impeller 6 and the second impeller 7 are symmetrically mounted on the motion sleeve 26, and the first impeller 6 is located in the first arc-shaped shell 13, and the second impeller 7 is located in the second arc-shaped shell 14; the first impeller 6 is in contact engagement with the second impeller 7 and a shoulder 25 on the moving sleeve 26.

As shown in fig. 26, the first and second nuts are mounted at the first and

second impellers

6 and 7, and the mounting orientations of the first and second nuts at the first impeller and the first and second nuts at the second impeller are symmetrically distributed about the spring mounting ring 20; for the mounting of the first and second nuts at the first impeller 6, as shown in fig. 19, the second nut 32 fastens the first impeller 6 to the moving sleeve 26 by threaded engagement with the external thread on the moving sleeve 26; as shown in fig. 33, a T-shaped ring groove 39 is formed on the end surface of the second nut 32; as shown in FIG. 25, T-ring 33 is mounted in T-ring groove 39; as shown in fig. 24, one end of the first nut 31 is fixedly mounted on the end face of the T-shaped ring 33, and the first nut 31 is in threaded engagement with the external thread on the drive shaft 4.

As shown in fig. 18 and 26, the first impeller 6 and the second impeller 7 have the same internal structure, and the installation positions of the internal structures of the first impeller 6 and the second impeller 7 are symmetrically distributed about the spring installation ring 20, and for the first impeller 6, the first impeller 6 comprises a first fixed wheel 34, a second fixed wheel 35, blades 36 and bosses 37, as shown in fig. 28 and 29, wherein the bosses 37 for being pressed by the second nuts 32 are arranged on the second fixed wheel 35; as shown in fig. 28, a plurality of blades 36 are uniformly circumferentially mounted on one end surface of the second fixed sheave 35 having the boss 37; as shown in fig. 27, the first fixed sheave 34 has a flare-shaped projection at the center of the end face at one end; the end face of the first fixed wheel 34, which is not provided with the flared protrusion, is fixedly installed on the end faces of the plurality of blades 36, and the center of the end face of the first fixed wheel 34 is provided with a through round hole.

The second fixed wheel 35 is in contact fit with the shaft shoulder 25; the second nut 32 is pressed against the boss 37 by a threaded engagement with the external thread on the moving sleeve 26.

A flared bulge is arranged at the center of the end face of one end of the first fixed wheel 34 in the first impeller 6 and matched with the flared bulge arranged at the center of the end face of one end of the first arc-shaped shell 13; the end face center of one end of the first fixed wheel 34 in the second impeller 7 is provided with a flared protrusion which is matched with the end face center of one end of the first arc-shaped shell 13.

As shown in fig. 31, the two external threads provided on the drive shaft 4 are provided at positions relative to the two first nuts 31 in the first impeller 6 and the second impeller 7 such that the two first nuts 31 are located between the two external threads on the drive shaft 4.

As shown in fig. 32, the two external threads provided on the drive shaft 4 are provided at positions relative to the two first nuts 31 in the first impeller 6 and the second impeller 7 such that the two first nuts 31 are located outside the two external threads on the drive shaft 4.

The specific implementation mode is as follows: because the impeller in the centrifugal pump is influenced by a plurality of axial force factors, the influence of the change of the flow at the inlet on the centrifugal force of the impeller is determined by carrying out simulation experiments and multiple experiments according to the specific centrifugal pump; the arrangement positions of the two external threads arranged on the driving shaft 4 relative to the two first nuts 31 in the first impeller 6 and the second impeller 7 have two schemes, and the two schemes need to be adjusted according to the actual engineering requirements. The invention does not disclose the arrangement position scheme of selecting two external threads relative to two first nuts 31 in the first impeller 6 and the second impeller 7; but illustrates how the steps are selected.

The two external threads are arranged at the following two positions relative to the two first nuts 31 in the first impeller 6 and the second impeller 7: according to engineering needs and multiple experiments, when the motion sleeve 26 axially moves towards the first impeller 6, the axial force borne by the first impeller 6 at the moment is larger than the axial force borne by the second impeller 7; first mounting position: the two first nuts 31 are positioned between the two external threads on the driving shaft 4, the resultant of the axial forces applied to the first impeller 6 and the second impeller 7 at this time is directed to the first impeller 6, the moving sleeve 26 at this time will move towards the first impeller 6, and the moving sleeve 26 will drive the second nut 32 to move axially towards the liquid inlet pipe 2 through the external threads opened on the moving sleeve 26; at this time, the second nut 32 drives the first nut 31 to axially move towards the liquid inlet pipe 2 through the T-shaped ring 33, at this time, the first nut 31 and the external thread on the driving shaft 4 are in threaded transmission, and at this time, the position of the first nut 31 on the first impeller 6 relative to the second nut 32 is changed; however, the first nut 31 on the second impeller 7 will also move axially in the direction approaching the liquid inlet pipe 2 along with the moving sleeve 26, and since the matching part of the first nut 31 on the second impeller 7 and the driving shaft 4 is not in threaded fit, the position of the first nut 31 on the second impeller 7 relative to the second nut 32 is not changed at this time; after the installation position of the first nut 31 at the first impeller 6 relative to the second thread is adjusted, the flow rate of the solution entering the first impeller 6 will be changed, and if the centrifugal pump works normally again, the axial float displacement of the moving sleeve 26 in the direction of the liquid inlet pipe 2 will be relieved, which means that when the installation positions of the first nut 31 and the second nut 32 on the first impeller 6 are adjusted, the axial resultant force applied to the first impeller 6 and the second impeller 7 is reduced; different threads are continuously selected for the driving shaft 4 and the first nut 31 until the first impeller 6 and the second impeller 7 do not move along the axial direction when the centrifugal pump works, the threads on the first nut 31 and the driving shaft 4 are the optimal experimental values, and the centrifugal force on the impeller on the centrifugal pump can be completely eliminated by using the threads with the optimal values, so that the purposes of protecting the bearing of the centrifugal pump and prolonging the service life of the centrifugal pump are achieved; if the centrifugal pump works normally again, the axial float displacement of the moving sleeve 26 in the direction of the liquid inlet pipe 2 will increase, which means that when the mounting positions of the first nut 31 and the second nut 32 on the first impeller 6 are adjusted, the resultant axial force applied to the first impeller 6 and the second impeller 7 is increased, and at this time, a second mounting position is required, and the two first nuts 31 are located outside the two external threads on the driving shaft 4; the work of the first middle mounting position is continued until the first impeller 6 and the second impeller 7 do not move along the axial direction when the centrifugal pump works, the first nut 31 and the thread on the driving shaft 4 are the optimal experimental values, and the centrifugal force on the impeller on the centrifugal pump can be completely eliminated by using the thread with the optimal value, so that the purposes of protecting the bearing of the centrifugal pump and prolonging the service life of the centrifugal pump are achieved.

When the centrifugal pump of the present invention works normally, as shown in fig. 30, firstly, the solution will enter the pump housing 3 through the liquid inlet pipe 2, and under the action of the partition plate 5, the solution will enter between the first fixed wheel 34 and the second fixed wheel 35 on the first impeller 6; at this time, the driving shaft 4 will drive the moving sleeve 26 to move through the matching of the guide block 30 and the guide groove 28, the moving sleeve 26 will drive the second fixed wheel 35 on the first impeller 6 to make a rotational motion through a key, the second fixed wheel 35 will drive the blades 36 mounted thereon to make a rotational motion, the blades 36 will accelerate the solution entering between the first fixed wheel 34 and the second fixed wheel 35 on the first impeller 6, the accelerated solution enters the first arc-shaped shell 13, and the solution in the first arc-shaped shell 13 will flow into one side of the cover plate 19 through the solution pipeline 9, so as to enter between the first fixed wheel 34 and the second fixed wheel 35 on the second impeller 7; at this time, the driving shaft 4 drives the moving sleeve 26 to move through the matching of the guide block 30 and the guide groove 28, the moving sleeve 26 drives the second fixed wheel 35 on the second impeller 7 to rotate, the second fixed wheel 35 drives the blade 36 mounted thereon to rotate, the blade 36 accelerates the solution entering between the first fixed wheel 34 and the second fixed wheel 35 on the second impeller 7, the accelerated solution enters the second arc-shaped shell 14, and then flows out of the first liquid outlet 15 formed in the second arc-shaped shell 14; then flows out of the pump shell 3 through the liquid outlet pipe 1.

In summary, the above embodiments are not intended to be limiting embodiments of the present invention, and those skilled in the art can make several modifications and refinements based on the essence of the present invention, and these modifications and refinements should be regarded as the protection scope of the present invention.

Claims

1. A centrifugal pump body characterized by: the impeller pump comprises an impeller device, a liquid outlet pipe, a liquid inlet pipe, a pump shell, a driving shaft and a partition plate, wherein the liquid inlet pipe and the liquid outlet pipe are arranged on the pump shell; a partition plate for dividing the inner cavity of the pump shell into a liquid inlet cavity and a liquid outlet cavity is arranged in the pump shell; the impeller device is arranged in the pump shell; a driving shaft connected with driving equipment is inserted into the pump shell, and the driving shaft penetrates into the impeller device to drive the impeller device to rotate;

2. A centrifugal pump body according to claim 1, characterized in that: the pump shell is also provided with a first shaft hole for supporting the driving shaft, and the first shaft hole and the driving shaft are installed in a matched mode through a shaft sleeve.

3. A centrifugal pump body according to claim 1, characterized in that: the impeller device comprises a first impeller, a second impeller, a solution pipeline, a first fixing ring, a fixing plate, a first arc-shaped shell, a second arc-shaped shell, a first liquid outlet hole, a connecting ring, a second liquid outlet hole, a containing cavity, a cover plate, a spring mounting ring, a buffer spring, a second sealing device, a liquid inlet hole, a second shaft hole, a shaft shoulder, a moving sleeve, a limiting ring groove, a guide groove, a limiting ring, a guide block, a first nut, a second nut, a T-shaped ring, a first sealing device and a T-shaped ring groove, wherein a horn-shaped bulge is arranged at the center of the end face of one end of the first arc-shaped shell; a plurality of second liquid outlet holes are formed in the outer arc surface of the first arc-shaped shell; a horn-mouth-shaped bulge is arranged at the center of the end face of one end of the second arc-shaped shell; a plurality of first liquid outlet holes are formed in the outer arc surface of the second arc-shaped shell; the first arc-shaped shell and the second arc-shaped shell have the same shape and size; the first arc-shaped shell and the second arc-shaped shell are fixedly connected together through a connecting ring, and the horn-shaped bulges on the first arc-shaped shell and the second arc-shaped shell are distributed far away from the connecting ring; the inner circle surface of the connecting ring is provided with an accommodating cavity; one end of the first arc-shaped shell, which is provided with a horn-mouth-shaped bulge, is fixedly arranged on the end surface of the partition plate; a first fixing ring is fixedly arranged at one end of the second arc-shaped shell, which is provided with a horn-mouth-shaped bulge, and two fixing plates are symmetrically arranged on the outer circular surface of the first fixing ring; one end of the fixing plate, which is far away from the first fixing ring, is fixedly arranged on the wall surface of the inner cavity of the pump shell; a through second shaft hole is formed in the center of the end face of the cover plate; the cover plate is matched with the driving shaft through a first sealing device, and one end of the cover plate is fixedly arranged on the end face of the second arc-shaped shell; the end surface of the cover plate is provided with a liquid inlet hole corresponding to the plurality of second liquid outlet holes, and the liquid inlet hole is communicated with the second liquid outlet holes through a solution pipeline; two guide blocks are symmetrically arranged on the outer circular surface of the driving shaft; two guide grooves are symmetrically arranged on the inner circular surface of the sports sleeve; a limiting ring is arranged on the outer circular surface at the position of the motion sleeve guide groove; a limiting ring groove is formed in the inner circular surface of the spring mounting ring; the spring mounting ring is arranged outside the motion sleeve through the rotation fit of the limiting ring and the limiting ring groove; two shaft shoulders which have the positioning function on the first impeller and the second impeller are symmetrically arranged on the outer circular surface of the motion sleeve relative to the spring mounting ring; the moving sleeve is arranged on the driving shaft through the sliding fit of the guide groove and the guide block, and the spring mounting ring is positioned in the accommodating cavity; the inner circular surfaces at two sides of the accommodating cavity on the connecting ring are matched and arranged with the outer circular surface of the moving sleeve through a second sealing device; a plurality of groups of buffer springs are symmetrically distributed on two sides of the spring mounting ring, one end of each buffer spring is fixedly arranged on the end face of the spring mounting ring, and the other end of each buffer spring is fixedly arranged on the end face of the accommodating cavity; the first impeller and the second impeller are symmetrically arranged on the moving sleeve, the first impeller is positioned in the first arc-shaped shell, and the second impeller is positioned in the second arc-shaped shell; the first impeller, the second impeller and a shaft shoulder on the moving sleeve are in contact fit;

4. A centrifugal pump body according to claim 3, wherein: the first impeller and the second impeller are completely same in inner structure, the mounting positions of the inner structures of the first impeller and the second impeller are symmetrically distributed relative to the spring mounting ring, the first impeller comprises a first fixed wheel, a second fixed wheel, blades and a boss, and the second fixed wheel is provided with the boss pressed by a second nut; a plurality of blades are uniformly arranged on the end surface of one end of the second fixed wheel, which is provided with a boss, in the circumferential direction; a horn-mouth-shaped bulge is arranged at the center of the end surface of one end of the first fixed wheel; the first fixed wheel is fixedly installed on the end faces of the blades without the horn-mouth-shaped protrusions, and the center of the end face of the first fixed wheel is provided with a through round hole.

5. A centrifugal pump body according to claim 4, characterized in that: the second fixed wheel is in contact fit with the shaft shoulder; the second nut forms screw-thread fit with the external thread on the moving sleeve and is pressed on the boss.

6. A centrifugal pump body according to claim 3 or claim 4, wherein: a horn-mouth-shaped bulge is arranged at the center of the end face of one end of a first fixed wheel in the first impeller and matched with the horn-mouth-shaped bulge arranged at the center of the end face of one end of a first arc-shaped shell; the end face center of one end of a first fixed wheel in the second impeller is provided with a horn-mouth-shaped bulge which is matched with the horn-mouth-shaped bulge arranged at the end face center of one end of the first arc-shaped shell.

7. A centrifugal pump body according to claim 1 or claim 3, wherein: the two external threads arranged on the driving shaft are arranged at positions corresponding to the two first nuts in the first impeller and the second impeller, and the two first nuts are positioned between the two external threads on the driving shaft.

8. A centrifugal pump body according to claim 1 or claim 3, wherein: the two external threads arranged on the driving shaft are arranged at positions corresponding to the two first nuts in the first impeller and the second impeller, and the two first nuts are positioned outside the two external threads on the driving shaft.