Vertical magnetic suspension centrifugal pump

Abstract

The invention belongs to the technical field of pumps, and particularly relates to a vertical magnetic suspension centrifugal pump which comprises a motor, a pump shell, an electromagnetic fixing assembly, a permanent magnet fixing assembly and a supporting assembly. A closed impeller is arranged in a cavity of the pump shell, a shaft rod assembly is fixed in the closed impeller, the upper end of the shaft rod assembly penetrates through the pump shell and then is connected with an output shaft of a motor, an electromagnetic fixing assembly is arranged at the upper end of the pump shell, and the lower end of the electric shaft rod assembly penetrates through the pump shell and then abuts against and is connected to a permanent magnet fixing assembly. Supporting assemblies are arranged at the lower ends of the permanent magnet fixing assemblies. The electromagnetic suspension bearing and the permanent magnet suspension bearing are matched with each other, so that the production cost is reduced, the suspension controllable support of the driving shaft is realized, and the problem of serious abrasion caused by long-term use of a mechanical bearing is solved; and meanwhile, the problem that the driving shaft shakes in the rotating process due to the fact that solid particles in the working liquid enter the magnetic suspension bearing to scrape and abrade the surfaces of the magnetic suspension bearing and the driving shaft is solved.

Description

Technical Field

[0001] The invention belongs to the technical field of pumps, and in particular relates to a vertical magnetic suspension centrifugal pump. Background Art

[0002] In traditional vertical centrifugal pumps, mechanical bearings are usually used to support the rotation of the pump shaft. There are many problems with mechanical bearings during operation, which leads to serious wear. On the one hand, there is direct contact friction between the mechanical bearing and the pump shaft. When the pump runs at high speed, this friction will generate a lot of heat. The accumulation of heat will not only cause the local temperature of the bearing to rise sharply, change the material properties of the bearing, reduce its hardness and strength, but also cause the failure of the lubricating oil film. Once the lubricating oil film cannot be formed normally or is destroyed, dry friction will occur between the bearing and the pump shaft, greatly increasing the degree of wear and shortening the service life of the bearing.

[0003] On the other hand, centrifugal pumps may face various complex working conditions when working, such as solid particle impurities in the working fluid, frequent fluctuations in the operating conditions of the pump, etc. When solid particles in the working fluid enter the gap between the bearing and the pump shaft, these particles will scratch and wear the surface of the bearing and the pump shaft like abrasives, causing scratches, pits and other damages on the bearing surface, further damaging the matching accuracy and lubrication conditions of the bearing, forming a vicious cycle, causing the bearing to wear faster, and in severe cases, it may even cause the pump shaft to get stuck, making the entire centrifugal pump system unable to operate normally. In addition, when mechanical bearings are subjected to axial and radial forces, due to their structural characteristics, the distribution of force is often not uniform, and local stress concentration is more common, which will also cause the bearings to fatigue and wear prematurely during long-term operation, reducing the reliability and stability of the equipment, increasing the maintenance cost and downtime of the equipment, and having an adverse effect on the continuity and economy of industrial production.

[0004] In order to solve the problem of serious wear of mechanical bearings in long-term use of the current vertical centrifugal pump, the present invention provides a vertical magnetic levitation centrifugal pump. Summary of the invention

[0005] In view of the above problems, an embodiment of the present application provides a vertical magnetic levitation centrifugal pump to solve the problem of severe wear of mechanical bearings in a vertical centrifugal pump.

[0006] In order to achieve the above-mentioned purpose, the embodiment of the present application provides the following technical solutions: a vertical magnetic levitation centrifugal pump, comprising a motor, a pump casing, an electromagnetic fixing assembly, a permanent magnet fixing assembly and a support assembly; the pump casing is composed of an upper casing and a lower casing, the upper casing and the lower casing are connected by fastening bolts, and the connection between the two is also sealed by a sealing ring, a closed impeller is arranged inside the cavity of the pump casing, a shaft rod assembly is fixedly arranged inside the closed impeller, the upper end of the shaft rod assembly passes through the upper casing and is connected to the output shaft of the motor, an electromagnetic fixing assembly is arranged at the upper end of the upper casing, the motor is arranged at the upper end of the electromagnetic fixing assembly by fastening bolts, the lower end of the shaft rod assembly passes through the lower casing and is abutted and connected to the permanent magnet fixing assembly, the permanent magnet fixing assembly is connected to the lower end surface of the lower casing, and a support assembly is arranged at the lower end of the permanent magnet fixing assembly.

[0007] According to a favorable embodiment, the upper shell is evenly provided with inclined water outlet holes along its circumferential outer wall, and the water outlet holes are connected to the water outlet pipes. The lower shell is evenly provided with inclined water inlet holes, the same number as the water outlet holes, along its circumferential outer wall, and the water inlet holes are connected to the water inlet pipes. The water inlet holes and the water outlet holes are arranged alternately and at intervals in sequence; the inclination direction of the water inlet holes is obliquely upward from the outer side of the lower shell toward the center of the lower shell.

[0008] According to a favorable embodiment, the electromagnetic fixing component includes an electromagnetic suspension bearing arranged on the upper shell, a fixing ring sleeve is arranged on the upper end outer wall of the upper shell, a limiting ring is arranged on the middle inner wall of the fixing ring sleeve, and the inner wall of the limiting ring is evenly provided with positioning rods that slide radially along its circumferential direction, and a ball is arranged on one end of the positioning rod facing the axis direction of the limiting ring; rectangular grooves are arranged on the upper and lower outer walls of the positioning rod, and strip grooves are also opened at positions corresponding to the upper and lower walls of the positioning rod inside the limiting ring, and a limiting pressure plate is slidably arranged between the corresponding rectangular groove and the strip groove, and balls are arranged on the upper and lower ends of the pressure limiting plate, and a spring is connected to one end of the pressure limiting plate away from the axis direction of the limiting ring, and the other end of the spring is connected to the corresponding inner wall of the rectangular groove and the inner wall of the strip groove, and an operating rod is rotatably arranged on one end of the pressure limiting plate close to the axis direction of the limiting ring, and the operating rod thread passes through the strip groove and is located at the inner ring position of the limiting ring.

[0009] According to a favorable embodiment, the shaft assembly includes a shaft sleeve fixedly arranged in a closed impeller, and also includes a drive shaft with both upper and lower ends passing through the shaft sleeve, and the drive shaft and the shaft sleeve are fixed by key fitting; the upper end of the drive shaft passes through the electromagnetic suspension bearing and is fixed with a spline sleeve, and the output shaft of the motor is also fixed with a spline sleeve, and the two spline sleeves are connected by a spline sleeve; the outer wall of the upper shaft of the drive shaft is also provided with a positioning ring, and the circumferential outer wall of the positioning ring is provided with an arc guide groove matching with the ball.

[0010] According to a favorable embodiment, the lower end of the driving shaft is provided with a positioning shaft in a limited plug-in manner, and a ball is provided after the lower end of the positioning shaft passes through the lower shell body; the permanent magnet fixing component includes a lower shell body fixedly provided at the lower end of the lower shell body, an electrostatic isolation sleeve is provided inside the lower shell body, and an electrostatic cover plate is provided on the upper end surface of the electrostatic isolation sleeve; a permanent magnet suspension bearing is provided inside the electrostatic isolation sleeve, and the permanent magnet suspension bearing is connected to the outer wall of the positioning shaft; balls are provided between the electrostatic cover plate and the outer wall of the positioning shaft to collide with each other.

[0011] According to a favorable embodiment, the electromagnetic fixing assembly also includes an inner cover plate arranged on the inner wall of the fixing ring sleeve, and the inner cover plate is connected to the shaft rod assembly through a ball bearing; the lower end surface of the inner cover plate is provided with a pressure sensor 1 for detecting the pressure of the internal cavity of the fixing ring sleeve, and the lower end surface of the inner cover plate is also provided with an air pressurizing device, and the electromagnetic fixing assembly also includes a pressure sensor 2 arranged in the inner cavity of the upper shell.

[0012] According to a favorable embodiment, an auxiliary cone is sleeved on the outer wall of the lower shaft rod of the driving shaft, and the auxiliary cone is fixedly arranged on the bottom inner wall of the lower shell body, and a circular through hole for the driving shaft to pass through is penetrated in the middle of the auxiliary cone, and a plurality of transverse step holes perpendicular to its axis are evenly arranged inside the auxiliary cone, and the transverse step holes penetrate the outside of the auxiliary cone, and a piston rod is arranged inside the transverse step hole through a spring, and a ball that contacts and cooperates with the outer wall of the driving shaft is arranged at one end of the piston rod facing the circular through hole, and an isolation net is arranged at one end of the transverse step hole located on the outer wall of the auxiliary cone.

[0013] According to a favorable embodiment, the support assembly includes a support platform arranged at the lower end of the lower casing, and the circumferential side wall of the support platform is evenly provided with square grooves, and a bracket is arranged in the intersection of the square grooves.

[0014] According to an advantageous embodiment, a valve cover is unidirectionally rotatably provided at the water inlet hole, and the valve cover rotates from the outer side of the lower shell toward the inner side of the lower shell.

[0015] Compared with the prior art, the vertical magnetic levitation centrifugal pump provided by the embodiment of the present invention has the following beneficial effects:

[0016] 1. The present invention realizes controllable suspension support for the drive shaft while reducing production costs by matching electromagnetic suspension bearings and permanent magnetic suspension bearings, thereby solving the problem of serious wear of mechanical bearings due to long-term use, avoiding the problem of heat generated during the use of mechanical bearings causing degradation of mechanical bearing performance, and avoiding the problem of solid particles in the working fluid entering the magnetic suspension bearings to scratch and wear the surfaces of the magnetic suspension bearings and the drive shaft, causing the drive shaft to shake during rotation.

[0017] 2. The present invention optimizes the structure of the pump casing, designs multiple water inlet holes, and utilizes the high-speed operation of the closed impeller to allow liquid to enter the multiple water inlet holes at the same time. The working fluid entering the pump casing can lift the closed impeller to a certain extent, thereby achieving self-suspension, further reducing the support requirements for electromagnetic suspension bearings and permanent magnetic suspension bearings, and is used to improve the stability of the closed impeller during high-speed operation.

[0018] 3. The present invention further achieves centering and stabilization of the drive shaft by using the interference effect of the positioning ring and the positioning rod on the upper end of the drive shaft and by using the pressure difference of the liquid in the inner and outer cavities of the pump housing to act on the piston rod to interfere with the lower end of the drive shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a three-dimensional structural diagram of the main viewing position of the present invention.

[0020] Figure 2 It is a front view cross-sectional view of the present invention.

[0021] Figure 3 It is a top view of the limiting ring of the present invention.

[0022] Figure 4 It is a three-dimensional structural diagram of the auxiliary frustum of the present invention.

[0023] Figure 5 For the present invention Figure 2 A partial enlarged view of point A in the middle.

[0024] Figure 6 The present invention Figure 2 A partial enlarged view of point B in the middle.

[0025] Figure 7 It is a schematic diagram of the three-dimensional structure of the closed impeller of the present invention.

[0026] Reference numerals in the figure: 1, motor; 2, pump housing; 21, upper housing; 211, water outlet; 212, water outlet pipe; 22, lower housing; 221, water inlet; 222, water inlet pipe; 223, valve cover; 3, electromagnetic fixing assembly; 31, electromagnetic suspension bearing; 32, fixing ring sleeve; 33, limiting ring; 331, strip groove; 34, positioning rod; 341, rectangular groove; 35, pressure limiting plate; 36, operating rod; 37, inner cover; 371, pressure sensor 1; 372, air pressurization Device; 373, pressure sensor 2; 4, permanent magnet fixing assembly; 41, lower casing; 42, electrostatic isolation sleeve; 43, electrostatic cover plate; 44, permanent magnet suspension bearing; 5, support assembly; 51, support platform; 52, bracket; 6, closed impeller; 7, shaft assembly; 71, shaft sleeve; 72, drive shaft; 73, spline sleeve; 74, spline sleeve; 75, positioning ring; 76, auxiliary frustum; 761, round through hole; 762, transverse stepped hole; 763, piston rod; 77, positioning shaft. DETAILED DESCRIPTION

[0027] The following is combined with Figure 1-7 This application is further described in detail.

[0028] Please refer to Figure 1 , Figure 2 and Figure 7 A vertical magnetic levitation centrifugal pump comprises a motor 1, a pump casing 2, an electromagnetic fixing assembly 3, a permanent magnet fixing assembly 4 and a supporting assembly 5; the pump casing 2 is composed of an upper casing 21 and a lower casing 22, the upper casing 21 and the lower casing 22 are connected by fastening bolts, and the connection between the two is also sealed by a sealing ring, a closed impeller 6 is arranged inside the cavity of the pump casing 2, a shaft assembly 7 is fixedly arranged inside the closed impeller 6, the upper end of the shaft assembly 7 passes through the upper casing 21 and is connected to the output shaft of the motor 1, the upper end of the upper casing 21 is provided with an electromagnetic fixing assembly 3, the motor 1 is arranged at the upper end of the electromagnetic fixing assembly 3 by fastening bolts, the lower end of the shaft assembly 7 passes through the lower casing 22 and is abutted against and connected to the permanent magnet fixing assembly 4, the permanent magnet fixing assembly 4 is connected to the lower end surface of the lower casing 22, and a supporting assembly 5 is arranged at the lower end of the permanent magnet fixing assembly 4.

[0029] When the centrifugal pump is working, firstly, the centrifugal pump is stably placed in the working position through the support assembly 5, and the starter motor 1 drives the closed impeller 6 through the shaft assembly 7 to pump and transport the working fluid; during the operation of the closed impeller 6, the electromagnetic fixing assembly 3 and the permanent magnet fixing assembly 4 cooperate with each other and replace the traditional mechanical bearing to ensure the stability of the closed impeller 6 during operation.

[0030] Please refer to Figure 1 and Figure 2 The upper shell 21 is evenly provided with inclined water outlet holes 211 along its circumferential outer wall, and the water outlet holes 211 are connected to water outlet pipes 212, and all water outlet pipes 212 are connected to a pipe fitting through a multi-way joint to collect water (not shown in the figure); the lower shell 22 is evenly provided with inclined water inlet holes 221 with the same number as the water outlet holes 211 along its circumferential outer wall, and the water inlet holes 221 are connected to water inlet pipes 222, and the water inlet holes 221 and the water outlet holes 211 are arranged alternately in sequence, and all water inlet pipes 222 are connected to a pipe fitting through a multi-way joint to collect water (not shown in the figure); the inclination direction of the water inlet hole 221 is obliquely upward from the outer side of the lower shell 22 to the center direction of the lower shell 22.

[0031] By setting a plurality of water inlet holes 221 connected in parallel, when the closed impeller 6 rotates at a high speed, the multiple water inlet holes 221 simultaneously take in water from the bottom, which can lift the closed impeller 6 to a certain extent, realize self-suspension, and reduce the support requirements for the electromagnetic fixing component 3.

[0032] See also Figure 2 A valve cover 223 is unidirectionally rotatably provided at the water inlet hole 221 , and the valve cover 223 rotates from the outer side of the lower shell 22 toward the inner side of the lower shell 22 .

[0033] The valve cover 223 is provided to allow only one-way inflow of the working fluid, so that when the present invention is not completely submerged in the working fluid, the working fluid is filled into the pump housing 2 through the outlet pipe 212 for starting the closed impeller 6 to realize the transportation of the working fluid.

[0034] See also Figure 2 , Figure 3 and Figure 5 The electromagnetic fixing assembly 3 includes an electromagnetic suspension bearing 31 arranged on the upper shell 21, a fixing ring sleeve 32 is arranged on the upper end outer wall of the upper shell 21, a limiting ring 33 is arranged on the middle inner wall of the fixing ring sleeve 32, and a positioning rod 34 that slides along its radial direction is evenly arranged on the inner wall of the limiting ring 33 along its circumferential direction, and a ball is arranged on one end of the positioning rod 34 facing the axial direction of the limiting ring 33; rectangular grooves 341 are arranged on the outer walls of the upper and lower ends of the positioning rod 34, and a groove 341 is also opened at the position corresponding to the upper and lower walls of the positioning rod 34 inside the limiting ring 33. There is a strip groove 331, and a limiting pressure plate 35 is slidably arranged between the corresponding rectangular groove 341 and the strip groove 331. Ball bearings are arranged at both ends of the limiting pressure plate 35. A spring is connected to the end of the limiting pressure plate 35 away from the axial direction of the limiting ring 33, and the other end of the spring is connected to the inner wall of the corresponding rectangular groove 341 and the inner wall of the strip groove 331. An operating rod 36 is rotatably arranged at one end of the limiting pressure plate 35 close to the axial direction of the limiting ring 33. The operating rod 36 is threaded through the strip groove 331 and is located at the inner ring position of the limiting ring 33.

[0035] The electromagnetic suspension bearing 31 provides controllable support. When the sensor inside the electromagnetic suspension bearing 31 detects that the drive shaft 72 is deflected, the magnetic force is generated in the electromagnet by controlling the current, and the magnitude of the local magnetic force is adjusted so that the drive shaft 72 maintains its stable suspension position unchanged.

[0036] See also Figure 2 , Figure 5 and Figure 6 The shaft assembly 7 includes a sleeve 71 fixedly arranged in the closed impeller 6, and also includes a driving shaft 72 with both upper and lower ends passing through the sleeve 71, and the driving shaft 72 and the sleeve 71 are fixed by key fitting; the upper end of the driving shaft 72 passes through the electromagnetic suspension bearing 31 and is fixed with a spline sleeve 73, and the output shaft of the motor 1 is also fixed with a spline sleeve 73, and the two spline sleeves 73 are connected by a spline sleeve 74; the outer wall of the upper shaft of the driving shaft 72 is also provided with a positioning ring 75, and the circumferential outer wall of the positioning ring 75 is provided with an arc guide groove that cooperates with the ball.

[0037] In order to further improve the stability of the drive shaft 72 during driving, reduce the adjustment force of the electromagnetic suspension bearing 31, and extend the service life of the electromagnetic suspension bearing 31; before use, the contact strength between the positioning rod 34 and the spring is controlled by screwing the operating rod 36, and the ball at the front end of the positioning rod 34 contacts the positioning ring 75 on the outer wall of the drive shaft 72. On the one hand, the drive shaft 72 can be positioned to support the drive shaft 72 when the centrifugal pump is stationary; on the other hand, the peripheral side of the drive shaft 72 is auxiliary limited to improve the stability of the drive shaft 72 during operation.

[0038] See also Figure 5 The electromagnetic fixing assembly 3 also includes an inner cover plate 37 arranged on the inner wall of the fixing ring sleeve 32, and the inner cover plate 37 is connected to the shaft assembly 7 through a ball bearing; the lower end surface of the inner cover plate 37 is provided with a pressure sensor 371 for detecting the pressure of the internal cavity of the fixing ring sleeve 32, and the lower end surface of the inner cover plate 37 is also provided with an air pressurizing device 372. The electromagnetic fixing assembly 3 also includes a pressure sensor 373 arranged in the inner cavity of the upper shell 21.

[0039] The function of the inner cover plate 37 is to keep the electromagnetic suspension bearing 31 in a closed cavity. When the working fluid pressure delivered by the centrifugal pump is greater than the pressure in the cavity where the electromagnetic suspension bearing 31 is located, the air pressurizing device 372 is started to inject high-pressure air into the cavity to ensure that the cavity pressure is balanced with the working fluid pressure, and prevent the working fluid from flowing back into the cavity through the gap of the electromagnetic suspension bearing 31 and affecting the normal operation of the electromagnetic suspension bearing 31.

[0040] See also Figure 2 and Figure 6 The lower end of the driving shaft 72 is provided with a positioning shaft 77 in a limited plug-in manner, and the lower end of the positioning shaft 77 is provided with a ball after passing through the lower shell 22; the permanent magnet fixing component 4 includes a lower shell 41 fixedly arranged at the lower end of the lower shell 22, and an electrostatic isolation sleeve 42 is arranged inside the lower shell 41, and an electrostatic cover plate 43 is arranged on the upper end surface of the electrostatic isolation sleeve 42; a permanent magnetic suspension bearing 44 is arranged inside the electrostatic isolation sleeve 42, and the permanent magnetic suspension bearing 44 is connected to the outer wall of the positioning shaft 77; a ball is arranged between the electrostatic cover plate 43 and the outer wall of the positioning shaft 77 to abut against each other.

[0041] See also Figure 1 , Figure 4 and Figure 6The outer wall of the lower shaft of the driving shaft 72 is sleeved with an auxiliary truncated cone 76, which is fixedly arranged on the bottom inner wall of the lower shell 22, and a round through hole 761 for the driving shaft 72 to pass through is penetrated in the middle of the auxiliary truncated cone 76, and a plurality of transverse stepped holes 762 perpendicular to its axis are evenly arranged inside the auxiliary truncated cone 76, and the transverse stepped holes 762 penetrate the outside of the auxiliary truncated cone 76, and a piston rod 763 is arranged inside the transverse stepped hole 762 through a spring, and a ball bearing that contacts and cooperates with the outer wall of the driving shaft 72 is arranged at one end of the piston rod 763 facing the round through hole 761, and an isolation net is arranged at one end of the transverse stepped hole 762 located on the outer wall of the auxiliary truncated cone 76, and the isolation net effectively prevents particles and debris in the working fluid from entering the transverse stepped hole 762 and clogging it.

[0042] The bottom end of the drive shaft 72 is used in conjunction with a permanent magnetic suspension bearing 44, which effectively reduces production costs. At the same time, the permanent magnetic suspension bearing 44 provides most of the support for the drive shaft 72 and the closed impeller 6, reducing the support strength of the electromagnetic suspension bearing 31, which is beneficial to the control stability of the electromagnetic suspension bearing 31.

[0043] In order to further ensure the stability of the closed impeller 6 during operation driven by the drive shaft 72, when the closed impeller 6 drives the working fluid inside the pump casing 2 to be centrifugally transported, the working fluid enters the pump casing 2 through the water inlet pipe 222, and the pressure generated by the working fluid outside the pump casing 2 is greater than the pressure inside the lower casing 22, so that part of the working fluid enters along the transverse stepped holes 762 evenly arranged on the outside of the auxiliary cone 76 and then hits the piston rod 763, so that the ball at the top of the piston rod 763 hits the outer wall of the lower shaft of the drive shaft 72 to further achieve stabilization operation.

[0044] See also Figure 1 The support assembly 5 includes a support platform 51 arranged at the lower end of the lower shell 41, and the circumferential side walls of the support platform 51 are evenly provided with square grooves, and a bracket 52 is arranged at the intersection of the square grooves; the support assembly 5 is provided to improve the stability of the present invention during operation, and is also used to raise the water suction port position at the lower end of the water inlet pipe 222 to cope with complex working environments.

[0045] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A vertical magnetic suspension centrifugal pump, comprising a motor (1), a pump housing (2), an electromagnetic fixing assembly (3), a permanent magnetic fixing assembly (4) and a support assembly (5); characterized in that: The pump casing (2) is composed of an upper casing (21) and a lower casing (22), the upper casing (21) and the lower casing (22) are connected by fastening bolts, and the connection between the two is also sealed by a sealing ring. A closed impeller (6) is arranged inside the cavity of the pump casing (2), and a shaft assembly (7) is fixedly arranged inside the closed impeller (6). The upper end of the shaft assembly (7) passes through the upper casing (21) and is connected to the output shaft of the motor (1). An electromagnetic fixing assembly (3) is arranged at the upper end of the upper casing (21), and the motor (1) is arranged at the upper end of the electromagnetic fixing assembly (3) by fastening bolts. The lower end of the shaft assembly (7) passes through the lower casing (22) and is abutted against and connected to the permanent magnetic fixing assembly (4). The permanent magnetic fixing assembly (4) is connected to the lower end surface of the lower casing (22), and a support assembly (5) is arranged at the lower end of the permanent magnetic fixing assembly (4); The upper shell (21) is evenly provided with inclined water outlet holes (211) along its circumferential outer wall, and the water outlet holes (211) are connected to water outlet pipes (212). The lower shell (22) is evenly provided with inclined water inlet holes (221) of the same number as the water outlet holes (211) along its circumferential outer wall, and the water inlet holes (221) are connected to water inlet pipes (222). The water inlet holes (221) and the water outlet holes (211) are arranged alternately in sequence; the inclination direction of the water inlet holes (221) is obliquely upward from the outer side of the lower shell (22) toward the center of the lower shell (22).

2. A vertical magnetic levitation centrifugal pump according to claim 1, characterized in that: The electromagnetic fixing assembly (3) comprises an electromagnetic suspension bearing (31) arranged on an upper shell (21); a fixing ring sleeve (32) is arranged on the upper outer wall of the upper shell (21); a limiting ring (33) is arranged on the middle inner wall of the fixing ring sleeve (32); positioning rods (34) that slide along the radial direction are evenly arranged on the inner wall of the limiting ring (33) along its circumferential direction; a ball is arranged on one end of the positioning rod (34) facing the axial direction of the limiting ring (33); rectangular grooves (341) are arranged on the upper and lower outer walls of the positioning rod (34); and rectangular grooves (341) are also arranged at positions inside the limiting ring (33) corresponding to the upper and lower walls of the positioning rod (34). A strip groove (331) is provided, and a pressure limiting plate (35) is slidably arranged between the corresponding rectangular groove (341) and the strip groove (331), and balls are arranged at both the upper and lower ends of the pressure limiting plate (35), and a spring is connected to one end of the pressure limiting plate (35) away from the axis direction of the limiting ring (33), and the other end of the spring is connected to the inner wall of the corresponding rectangular groove (341) and the inner wall of the strip groove (331), and an operating rod (36) is rotatably arranged at one end of the pressure limiting plate (35) close to the axis direction of the limiting ring (33), and the operating rod (36) is located at the inner ring position of the limiting ring (33) after the thread passes through the strip groove (331).

3. A vertical magnetic levitation centrifugal pump according to claim 2, characterized in that: The shaft assembly (7) comprises a shaft sleeve (71) fixedly arranged in the closed impeller (6), and also comprises a driving shaft (72) with both upper and lower ends passing through the shaft sleeve (71), and the driving shaft (72) and the shaft sleeve (71) are fixed by key-matching clamping; the upper end of the driving shaft (72) passes through the electromagnetic suspension bearing (31) and is fixed with a spline sleeve (73), and the output shaft of the motor (1) is also fixedly provided with a spline sleeve (73), and the two spline sleeves (73) are connected by a spline sleeve (74); The outer wall of the upper shaft of the driving shaft (72) is also provided with a positioning ring (75), and the circumferential outer wall of the positioning ring (75) is provided with an arc-shaped guide groove matched with the ball.

4. A vertical magnetic levitation centrifugal pump according to claim 3, characterized in that: The lower end of the driving shaft (72) is provided with a positioning shaft (77) in a limited plug-in manner, and the lower end of the positioning shaft (77) is provided with a ball after passing through the lower shell (22); the permanent magnet fixing component (4) comprises a lower shell (41) fixedly arranged at the lower end of the lower shell (22), an electrostatic isolation sleeve (42) is arranged inside the lower shell (41), and an electrostatic cover plate (43) is arranged on the upper end surface of the electrostatic isolation sleeve (42); a permanent magnetic suspension bearing (44) is arranged inside the electrostatic isolation sleeve (42), and the permanent magnetic suspension bearing (44) is connected to the outer wall of the positioning shaft (77); and a ball is arranged between the electrostatic cover plate (43) and the outer wall of the positioning shaft (77) to abut against each other.

5. A vertical magnetic levitation centrifugal pump according to claim 2, characterized in that: The electromagnetic fixing assembly (3) also includes an inner cover plate (37) arranged on the inner wall of the fixing ring sleeve (32), and the inner cover plate (37) is connected to the shaft rod assembly (7) through a ball bearing; the lower end surface of the inner cover plate (37) is provided with a pressure sensor (371) for detecting the pressure of the internal cavity of the fixing ring sleeve (32), and the lower end surface of the inner cover plate (37) is also provided with an air pressurizing device (372), and the electromagnetic fixing assembly (3) also includes a pressure sensor (373) arranged in the inner cavity of the upper shell (21).

6. A vertical magnetic levitation centrifugal pump according to claim 3, characterized in that: The outer wall of the lower shaft of the driving shaft (72) is sleeved with an auxiliary truncated cone (76), which is fixedly arranged on the bottom inner wall of the lower shell (22), and a round through hole (761) for the driving shaft (72) to pass through is arranged in the middle of the auxiliary truncated cone (76), and a plurality of transverse stepped holes (762) perpendicular to the axis of the auxiliary truncated cone (76) are evenly arranged inside the auxiliary truncated cone (76), and the transverse stepped holes (762) penetrate the outside of the auxiliary truncated cone (76), and a piston rod (763) is arranged inside the transverse stepped hole (762) through a spring, and a ball bearing that contacts and cooperates with the outer wall of the driving shaft (72) is arranged at one end of the piston rod (763) facing the round through hole (761), and an isolation net is arranged at one end of the transverse stepped hole (762) located on the outer wall of the auxiliary truncated cone (76).

7. A vertical magnetic levitation centrifugal pump according to claim 4, characterized in that: The support assembly (5) comprises a support platform (51) arranged at the lower end of the lower casing (41), and the circumferential side wall of the support platform (51) is evenly provided with square grooves, and a bracket (52) is arranged in the intersection of the square grooves.

8. A vertical magnetic levitation centrifugal pump according to claim 1, characterized in that: A valve cover (223) is unidirectionally rotatably provided at the water inlet hole (221), and the valve cover (223) rotates from the outside of the lower shell (22) toward the inside of the lower shell (22).

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