A vertical magnetic levitation centrifugal pump

Abstract

The present invention belongs to the technical field of pumps, and in particular relates to a vertical magnetic levitation centrifugal pump, comprising a motor, a pump casing, an electromagnetic fixing assembly, a permanent magnetic fixing assembly, and a support assembly; a closed impeller is provided inside the cavity of the pump casing, a shaft assembly is fixed inside the closed impeller, the upper end of the shaft assembly passes through the pump casing and is connected to the output shaft of the motor, the upper end of the pump casing is provided with an electromagnetic fixing assembly, the lower end of the electric shaft assembly passes through the pump casing and is abutted against the permanent magnetic fixing assembly, and the lower end of the permanent magnetic fixing assembly is provided with a support assembly. The present invention achieves controllable suspension support for the drive shaft while reducing production costs by matching electromagnetic suspension bearings and permanent magnetic suspension bearings, solving the problem of serious wear of mechanical bearings due to long-term use, and at the same time avoiding the problem of solid particles in the working fluid entering the magnetic suspension bearing and scratching and wearing the surface of the magnetic suspension bearing and the drive shaft, causing the drive shaft to shake during rotation.

Description

Technical Field

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

[0002] Traditional vertical centrifugal pumps typically use mechanical bearings to support the rotation of the pump shaft. These bearings present numerous operational issues, leading to significant wear. Firstly, direct contact friction between the mechanical bearing and the pump shaft generates significant heat at high pump speeds. This heat accumulation not only causes a sharp increase in the bearing's local temperature, altering the bearing's material properties and reducing its hardness and strength, but also leads to the failure of the lubricating oil film. If the lubricating oil film fails to form properly or is damaged, dry friction occurs between the bearing and the pump shaft, significantly increasing wear and shortening the bearing's service life.

[0003] On the other hand, centrifugal pumps may face various complex working conditions during operation, such as solid particle impurities in the working fluid and frequent fluctuations in the operating conditions of the pump. When solid particles in the working fluid enter the gap between the bearing and the pump shaft, these particles will act like abrasives, scratching and wearing the bearing and pump shaft surfaces, causing scratches, pits and other damage to the bearing surface, further damaging the bearing's matching accuracy and lubrication conditions, forming a vicious cycle, causing the bearing to wear faster, and in severe cases, it may even cause the pump shaft to become stuck, making the entire centrifugal pump system unable to operate normally. In addition, due to their structural characteristics, when mechanical bearings are subjected to axial and radial forces, the force distribution is often uneven, and local stress concentration is more common. This will also cause the bearings to suffer fatigue wear prematurely during long-term operation, reducing the reliability and stability of the equipment, increasing equipment maintenance costs and downtime, and having an adverse impact 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 current vertical centrifugal pumps, 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 objectives, the embodiments of the present application provide 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 provided inside the cavity of the pump casing, a shaft assembly is fixedly provided inside the closed impeller, the upper end of the shaft assembly passes through the upper casing and is connected to the output shaft of the motor, the upper end of the upper casing is provided with an electromagnetic fixing assembly, the motor is provided at the upper end of the electromagnetic fixing assembly by fastening bolts, the lower end of the shaft assembly passes through the lower casing and is abutted against the permanent magnet fixing assembly, the permanent magnet fixing assembly is connected to the lower end face of the lower casing, and a support assembly is provided 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 at intervals in sequence; the inclination direction of the water inlet holes is obliquely upward from the outside of the lower shell toward the center of the lower shell.

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

[0010] According to a favorable embodiment, the lower end of the drive shaft is provided with a positioning shaft in a limited plug-in manner, and the lower end of the positioning shaft is provided with a ball after passing through the lower shell; the permanent magnet fixing component includes a lower shell fixedly provided at the lower end of the lower shell, the interior of the lower shell is provided with an electrostatic isolation sleeve, and the upper end surface of the electrostatic isolation sleeve is provided with an electrostatic cover plate; the interior of the electrostatic isolation sleeve is provided with a permanent magnet suspension bearing, 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 face 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 face 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, the outer wall of the lower shaft of the drive shaft is sleeved with an auxiliary cone, which is fixedly arranged on the bottom inner wall of the lower shell, and a circular through hole for the drive shaft to pass through is provided in the middle of the auxiliary cone, and a plurality of transverse stepped holes perpendicular to its axis are evenly provided inside the auxiliary cone, and the transverse stepped holes pass through the outside of the auxiliary cone, and a piston rod is provided inside the transverse stepped hole through a spring, and a ball is provided at one end of the piston rod facing the circular through hole, which is in conflict with the outer wall of the drive shaft, and an isolation net is provided at one end of the transverse stepped hole located on the outer wall of the auxiliary cone.

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

[0014] According to an advantageous embodiment, a valve cover is provided at the water inlet hole for unidirectional rotation, 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 of 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 current 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 and scratching and wearing 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, achieve self-suspension, and further reduce the support requirements for electromagnetic suspension bearings and permanent magnetic suspension bearings, which 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 main viewing position three-dimensional structural diagram of the present invention.

[0020] Figure 2 It is a sectional view of the main 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 This 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; 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; 44. Permanent magnet suspension bearing; 5. Support assembly; 51. Support platform; 52. Bracket; 6. Closed impeller; 7. Shaft assembly; 71. Bushing; 72. Drive shaft; 73. Spline sleeve; 74. Spline sleeve; 75. Positioning ring; 76. Auxiliary frustum; 761. Circular through hole; 762. Horizontal stepped hole; 763. Piston rod; 77. Positioning shaft. DETAILED DESCRIPTION

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

[0028] Please refer to Figure 1 、 Figure 2 and Figure 7 , a vertical magnetic levitation centrifugal pump, comprising a motor 1, a pump casing 2, an electromagnetic fixing assembly 3, a permanent magnet fixing assembly 4 and a support 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 provided inside the cavity of the pump casing 2, a shaft assembly 7 is fixedly provided 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 provided 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 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 support assembly 5 is provided at the lower end of the permanent magnet fixing assembly 4.

[0029] When the centrifugal pump is working, the centrifugal pump is first stably placed in the working position through the support assembly 5, and the starting 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 magnetic fixing assembly 4 cooperate with each other and replace the traditional mechanical bearings 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 for water collection (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 in sequence at intervals and staggered, and all water inlet pipes 222 are connected to a pipe fitting through a multi-way joint for water collection (not shown in the figure); the inclination direction of the water inlet hole 221 is obliquely upward from the outside of the lower shell 22 toward the center of the lower shell 22.

[0031] By setting up a plurality of water inlet holes 221 connected in parallel, when the closed impeller 6 rotates at high speed, multiple water inlet holes 221 simultaneously enter 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 Figure 2 A valve cover 223 is provided at the water inlet hole 221 for one-way rotation, and the valve cover 223 rotates from the outside of the lower shell 22 toward the inside 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 to start the closed impeller 6 to realize the transportation of the working fluid.

[0034] See 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 provided on the upper end outer wall of the upper shell 21, a limit ring 33 is provided on the middle inner wall of the fixing ring sleeve 32, and a positioning rod 34 sliding along its radial direction is evenly provided on the inner wall of the limit ring 33 along its circumferential direction, and a ball is provided on one end of the positioning rod 34 facing the axis direction of the limit ring 33; rectangular grooves 341 are provided on the outer walls of the upper and lower ends of the positioning rod 34, and a groove 341 is provided on the inner wall of the limit ring 33 at a position corresponding to the upper and lower walls of the positioning rod 34. There is a strip groove 331, and a pressure limiting plate 35 is slidingly arranged between the corresponding rectangular groove 341 and the strip groove 331. Ball bearings are arranged on the upper and lower ends of the pressure limiting plate 35. The end of the pressure limiting plate 35 away from the axial direction of the limiting ring 33 is connected to a spring, 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 on the end of the pressure limiting 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 current is controlled to generate magnetic force in the electromagnet, and the magnitude of the local magnetic force is adjusted to keep the drive shaft 72 in its stable suspension position unchanged.

[0036] See Figure 2 、 Figure 5 and Figure 6 The shaft assembly 7 includes a shaft sleeve 71 fixedly set in the closed impeller 6, and also includes a drive shaft 72 with both upper and lower ends passing through the shaft sleeve 71, and the drive shaft 72 and the shaft sleeve 71 are fixed by key fitting; the upper end of the drive 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 drive 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 the driving process, 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 circumferential side of the drive shaft 72 is auxiliary limited to improve the stability of the drive shaft 72 during operation.

[0038] See 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 second 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 pressure of the working fluid 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 Figure 2 and Figure 6 The lower end of the drive 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 assembly 4 includes a lower shell 41 fixedly provided at the lower end of the lower shell 22, and an electrostatic isolation sleeve 42 is provided inside the lower shell 41, and an electrostatic cover plate 43 is provided on the upper end surface of the electrostatic isolation sleeve 42; a permanent magnetic suspension bearing 44 is provided 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 provided between the electrostatic cover plate 43 and the outer wall of the positioning shaft 77 to abut against each other.

[0041] See Figure 1 、 Figure 4 and Figure 6The outer wall of the lower shaft of the drive shaft 72 is provided with an auxiliary cylindrical stage 76, which is fixed to the bottom inner wall of the lower shell 22, and a circular through hole 761 is provided in the middle of the auxiliary cylindrical stage 76 for the drive shaft 72 to pass through. The interior of the auxiliary cylindrical stage 76 is evenly provided with a number of transverse stepped holes 762 perpendicular to its axis. The transverse stepped holes 762 pass through the outside of the auxiliary cylindrical stage 76, and a piston rod 763 is provided inside the transverse stepped hole 762 through a spring, and a ball is provided at one end of the piston rod 763 facing the through hole 761, which is in conflict with the outer wall of the drive shaft 72. An isolation net is provided at one end of the transverse stepped hole 762 located on the outer wall of the auxiliary cylindrical stage 76 to effectively prevent particulate matter in the working fluid from entering and clogging the interior of the transverse stepped hole 762.

[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 for centrifugal transportation, 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 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 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 at the same time 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 description 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 levitation centrifugal pump, comprising a motor, a pump housing, an electromagnetic fixing assembly, a permanent magnet fixing assembly, and a support assembly; characterized in that: The pump casing is composed of an upper casing and a lower casing, which are connected by fastening bolts, and the connection between the two is also sealed by a sealing ring. A closed impeller is provided inside the cavity of the pump casing, and a shaft assembly is fixed inside the closed impeller. The upper end of the shaft assembly passes through the upper casing and is connected to the output shaft of the motor. An electromagnetic fixing assembly is provided at the upper end of the upper casing, and the motor is set at the upper end of the electromagnetic fixing assembly by fastening bolts. The lower end of the shaft assembly passes through the lower casing and is connected to the permanent magnetic fixing assembly. The permanent magnetic fixing assembly is connected to the lower end surface of the lower casing, and a support assembly is provided at the lower end of the permanent magnetic fixing assembly. 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 the same number of inclined water inlet holes 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 at intervals. 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. The electromagnetic fixing assembly includes an electromagnetic suspension bearing arranged on the upper shell, the upper outer wall of the upper shell is provided with a fixing ring sleeve, the middle inner wall of the fixing ring sleeve is provided with a limit ring, the inner wall of the limit ring is evenly provided with a positioning rod that slides along its radial direction along its circumferential direction, and a ball is provided at one end of the positioning rod toward the axis direction of the limit ring; rectangular grooves are provided on the upper and lower outer walls of the positioning rod, and strip grooves are also provided at the positions corresponding to the upper and lower walls of the positioning rod inside the limit ring, and a limiting pressure plate is slidingly provided between the corresponding rectangular grooves and the strip grooves, and balls are provided on the upper and lower ends of the pressure limiting plate, and one end of the pressure limiting plate away from the axis direction of the limit ring is connected to a spring, 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. An operating rod is rotatably provided at one end of the pressure limiting plate close to the axis direction of the limit ring, and the operating rod thread passes through the strip groove and is located at the inner ring position of the limit ring; The shaft assembly includes a shaft sleeve fixedly arranged in the 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 driving shaft is also provided with a positioning ring, and the circumferential outer wall of the positioning ring is provided with an arc guide groove matched with the ball.

2. A vertical magnetic levitation centrifugal pump according to claim 1, characterized in that: 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; the permanent magnet fixing assembly includes a lower shell fixedly provided at the lower end of the lower shell, an electrostatic isolation sleeve is provided inside the lower shell, and an electrostatic cover 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; a ball is provided between the electrostatic cover and the outer wall of the positioning shaft to collide with each other.

3. A vertical magnetic levitation centrifugal pump according to claim 1, characterized in that: 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. The electromagnetic fixing assembly also includes a pressure sensor 2 arranged in the inner cavity of the upper shell.

4. A vertical magnetic levitation centrifugal pump according to claim 1, characterized in that: The outer wall of the lower shaft of the driving shaft is sleeved with an auxiliary frustum, which is fixedly arranged on the bottom inner wall of the lower shell, and a circular through hole is provided in the middle of the auxiliary frustum for the driving shaft to pass through. The interior of the auxiliary frustum is evenly provided with a number of transverse stepped holes perpendicular to its axis, and the transverse stepped holes pass through the outside of the auxiliary frustum. A piston rod is provided inside the transverse stepped hole through a spring, and a ball is provided at one end of the piston rod facing the circular through hole, which is in conflict with the outer wall of the driving shaft, and an isolation net is provided at one end of the transverse stepped hole located on the outer wall of the auxiliary frustum.

5. A vertical magnetic levitation centrifugal pump according to claim 2, characterized in that: The support assembly includes a support platform arranged at the lower end of the lower shell, and the circumferential side wall of the support platform is evenly provided with square grooves, and a bracket is arranged at the intersection of the square grooves.

6. A vertical magnetic levitation centrifugal pump according to claim 1, characterized in that: A valve cover is provided at the water inlet hole for unidirectional rotation, and the rotation direction of the valve cover is from the outer side of the lower shell toward the inner side of the lower shell.

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