Modularized suspension axial magnetic flux shield pump

Abstract

The invention relates to a modular suspension axial magnetic flux shielding pump which comprises a pump shell and a machine shell installed on the pump shell, a pump cavity is formed in the pump shell, a water inlet and a water outlet are formed in the pump shell, a pump shaft is fixedly arranged in the center of the machine shell and extends into the pump cavity, an impeller rotationally installed on the pump shaft is arranged in the pump cavity, and a motor is arranged in the pump cavity. A rotor mounting groove is formed in the surface, facing the machine shell, of the impeller, a rotor module is arranged in the rotor mounting groove, and a rotor shielding sleeve for sealing the rotor mounting groove is arranged on the impeller; a stator installation groove is formed in the machine shell around the pump shaft, a stator module is arranged in the stator installation groove, the stator module and the rotor module are oppositely arranged, and a stator shielding plate for sealing the stator installation groove is arranged on the machine shell. The planar circular ring stator shielding plate is adopted, the manufacturing cost is reduced, the assembly process effect is simplified, the machine shell adopts bilateral water cooling, the motor power density is improved, the motor cost effect is reduced, the stator and rotor modular design is achieved, the rotor module rotates, the pump shaft is fixed, and assembly is simple.

Description

Technical Field

[0001] This application relates to the technical field of shielded pumps, and in particular to a modular suspended axial flux shielded pump. Background Technology

[0002] A canned motor pump is a special type of centrifugal pump that integrates the pump body and the drive motor. Its core feature is that the rotor and stator windings of the motor are completely isolated by a shielding sleeve, thereby achieving absolute leak-free transport of media (especially flammable, explosive, toxic, harmful, highly corrosive, or valuable liquids). It is a key piece of equipment for "zero-leakage" transport in fields such as chemical, pharmaceutical, and nuclear power. For example, Chinese patent application number 2022106178017 discloses a canned vortex pump, which includes a pump body, a stator shielding sleeve fixedly installed in the middle of the pump body, a front bearing housing fixedly installed in the shaft head chamber of the pump body, a front bearing fixedly installed in the middle of the front bearing housing, and a front shaft sleeve fixedly installed on the inner ring of the front bearing.

[0003] Regarding the aforementioned technologies, canned motor pumps currently typically employ a shielding sleeve structure to isolate the stator and rotor, and introduce fluid into the air gap between the rotor and stator to lubricate the sliding bearings. However, the motors used in current canned motor pumps occupy a relatively large volume, thus requiring some improvement. Summary of the Invention

[0004] To reduce the volume occupied by the shielded pump, this application provides a modular suspended axial flux shielded pump.

[0005] The modular suspended axial flux shielded pump provided in this application adopts the following technical solution: A modular suspended axial flux shielded pump includes a pump casing and a housing mounted on the pump casing. The pump casing has a pump chamber inside, an inlet on the end face of the pump casing, and an outlet on the side of the pump casing. A pump shaft is fixedly mounted at the center of the housing and extends into the pump chamber. An impeller is rotatably mounted on the pump shaft inside the pump chamber. A rotor mounting groove is provided on the surface of the impeller facing the housing. A rotor module is provided in the rotor mounting groove. A rotor shielding sleeve is provided on the impeller to close the rotor mounting groove. A stator mounting slot is provided on the housing around the pump shaft, a stator module is provided in the stator mounting slot, the stator module is arranged opposite to the rotor module, and a stator shielding plate is provided on the housing to close the stator mounting slot.

[0006] Preferably, the impeller has a mounting cavity at its center, in which a sliding bearing is fixedly mounted. The sliding bearing is sleeved on the outside of the pump shaft. An upper thrust bearing is sleeved on the pump shaft and abuts against the upper end of the sliding bearing. A lower thrust bearing is sleeved on the pump shaft and abuts against the lower end of the sliding bearing. An anti-detachment part is provided at the end of the pump shaft.

[0007] Preferably, the anti-detachment part includes an anti-detachment ring groove formed at the end of the pump shaft, and an anti-detachment retaining ring snapped into the anti-detachment ring groove.

[0008] Preferably, the housing has a mounting base at its center, and the mounting base has a mounting hole at its center, and the pump shaft is interference-fitted into the mounting hole.

[0009] Preferably, a lower magnetic levitation magnet is embedded in the mounting base, and an upper magnetic levitation magnet is provided on the surface of the impeller facing the housing. The upper magnetic levitation magnet and the lower magnetic levitation magnet are arranged opposite to each other, and a magnetic levitation gap is formed between the upper magnetic levitation magnet and the lower magnetic levitation magnet.

[0010] Preferably, the rotor module includes a rotor yoke and a rotor magnet, the rotor yoke being fixedly disposed in the rotor mounting slot, and the rotor magnet being fixedly disposed on the rotor yoke.

[0011] Preferably, the stator module includes a stator core and a stator winding, the stator core being fixedly disposed in the stator mounting slot, and the stator winding being disposed on the stator core.

[0012] Preferably, the side wall of the pump casing is provided with an upper water passage hole, which is connected to the pump cavity; the side wall of the casing is provided with a lower water passage hole; the bottom of the casing is provided with a cooling water passage; one end of the lower water passage hole is connected to the upper water passage hole; and the other end of the lower water passage hole is connected to the cooling water passage. A circulation channel is provided at the center of the pump shaft along its axial direction. One end of the circulation channel is connected to the cooling water circuit, and the other end of the circulation channel is connected to the side wall of the pump shaft.

[0013] Preferably, the cooling water circuit includes at least one concentric annular water circuit, adjacent annular water circuits are connected by a connecting water circuit, the lower water inlet is connected to the outermost annular water circuit, and the circulation channel is connected to the innermost annular water circuit.

[0014] Preferably, the cooling water passage is arranged in a spiral shape, with one end of the cooling water passage connected to the other end of the lower water inlet and the other end of the cooling water passage connected to one end of the circulation channel.

[0015] In summary, this application includes at least one of the following beneficial technical effects: 1. This application adopts an installation method in which the rotor module is mounted on the impeller, the rotor module rotates and the pump shaft is fixed, and a planar annular stator shielding plate is used to make the rotor module and stator module axially arranged. Under the same power, the volume occupied by the canned pump can be effectively reduced, the manufacturing cost of the canned pump components can be reduced, and the assembly process can be simplified. 2. This application utilizes the pressure difference between the inlet and outlet of the canned motor pump by setting up an upper water passage, a lower water passage, a cooling water circuit, and a circulation channel. This allows the transported medium to form a self-circulating cooling system within the canned motor pump and to lubricate the sliding bearings, thereby improving the service life of the canned motor pump. It also achieves a double-sided water cooling effect on the stator module, thereby increasing the overall power density and reducing the overall cost. 3. This application can achieve the effect of balancing the axial force of the impeller by using the upper magnetic levitation magnet and the lower magnetic levitation magnet, wherein the axial limit of the impeller can be achieved by using the upper thrust bearing. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of a canned motor pump.

[0017] Figure 2 This is a schematic diagram of the internal structure of a canned motor pump.

[0018] Figure 3 This is a cross-sectional schematic diagram of a canned motor pump.

[0019] Figure 4 This is a schematic diagram of the cooling water circuit.

[0020] Explanation of reference numerals in the attached drawings: 1. Pump casing; 2. Machine casing; 3. Pump chamber; 4. Inlet; 5. Outlet; 6. Pump shaft; 7. Mounting base; 8. Mounting hole; 9. Impeller; 10. Sliding bearing; 11. Upper thrust bearing; 12. Lower thrust bearing; 13. Anti-detachment ring groove; 14. Anti-detachment retaining ring; 15. Rotor mounting slot; 16. Rotor module; 161. Rotor yoke; 162. Rotor magnet; 17. Rotor shielding sleeve; 18. Stator mounting slot; 19. Stator module; 191. Stator core; 192. Stator winding; 20. Stator shielding plate; 21. Upper levitation magnet; 22. Lower levitation magnet; 23. Upper water passage; 24. Lower water passage; 25. Cooling water passage; 251. Annular water passage; 252. Connecting water passage; 26. Circulation channel. Detailed Implementation

[0021] The following is in conjunction with the appendix Figures 1-4 This application will be described in further detail.

[0022] A modular suspended axial flux shielded pump, reference Figure 1 and Figure 2 As shown, it includes a pump housing 1 and a casing 2 mounted on the pump housing 1, so as to Figure 1 For reference, the housing 2 is installed below the pump housing 1. Several threaded holes are provided on the edge of the lower end face of the pump body. The threaded holes are spaced apart in the circumferential direction. The housing 2 is connected to the threaded holes by bolts, so as to realize the installation and fixation between the housing 2 and the pump housing 1.

[0023] A pump chamber 3 is provided inside the pump casing 1. An inlet 4 is provided on the end face of the pump casing 1, and an outlet 5 is provided on the side of the pump casing 1. Figure 1 For reference direction, the inlet 4 is located on the upper end face of the pump casing 1, and the outlet 5 is located on the side of the pump casing 1. Both the inlet 4 and the outlet 5 are connected to the pump chamber 3.

[0024] A pump shaft 6 is fixedly installed at the center of the housing 2, that is, a mounting base 7 is installed at the center of the housing 2, and a mounting hole 8 is installed at the center of the mounting base 7. The pump shaft 6 is interference-fitted into the mounting hole 8. The axial direction of the pump shaft 6 is the same as the axial direction of the mounting base 7, and the pump shaft 6 extends into the pump chamber 3.

[0025] An impeller 9 is disposed within the pump chamber 3 and is rotatably mounted on the pump shaft 6. The rotatable mounting structure of the impeller 9 and the pump shaft 6 is as follows: a mounting cavity is provided at the center of the impeller 9, extending through the upper and lower surfaces of the center of the impeller 9. A sliding bearing 10 is fixedly disposed within the mounting cavity and is interference-fitted into the mounting cavity. The sliding bearing 10 is sleeved on the outside of the pump shaft 6. An upper thrust bearing 11 is sleeved on the pump shaft 6, abutting against the upper end of the sliding bearing 10. A lower thrust bearing 12 is sleeved on the pump shaft 6, located on the upper surface of the mounting base 7, abutting against the lower end of the sliding bearing 10. An anti-detachment part is provided at the end of the pump shaft 6. In one embodiment, the anti-detachment part includes an anti-detachment ring groove 13 formed at the end of the pump shaft 6 and an anti-detachment retaining ring 14 snapped into the anti-detachment ring groove 13.

[0026] A rotor mounting groove 15 is provided on the surface of the impeller 9 facing the housing 2. The rotor mounting groove 15 is annularly arranged on the edge of the impeller 9. A rotor module 16 is disposed within the rotor mounting groove 15, and the rotor module 16 is also annularly arranged. A rotor shielding sleeve 17 is provided on the impeller 9 to close the rotor mounting groove 15, and the rotor shielding sleeve 17 closes the rotor mounting groove 15 and completely covers the rotor module 16. In one embodiment, the rotor shielding sleeve 17 is fixed to the impeller 9 by welding to cover the rotor module 16. In another embodiment, the rotor shielding sleeve 17 is fixed to the impeller 9 by snap-fit ​​to cover the rotor module 16, and the contact surface between the rotor shielding sleeve 17 and the impeller 9 is sealed by a sealing ring. Through the above methods, the rotor module 16 can be sealed in the rotor mounting groove 15, ensuring that the external conveying medium will not come into contact with the rotor module 16. The specific implementation method can be selected according to the actual situation.

[0027] In one embodiment, the rotor module 16 includes a rotor yoke 161 and rotor magnets 162. The rotor yoke 161 is fixedly disposed in the rotor mounting groove 15. Multiple rotor magnets 162 are provided and are fixedly disposed on the rotor yoke 161 at circumferential intervals. The rotor magnets 162 are disposed on the lower surface of the rotor yoke 161 and face the housing 2.

[0028] In another embodiment, the rotor module 16 includes a rotor yoke 161 and a rotor magnetic ring. The rotor yoke 161 is fixedly disposed in the rotor mounting groove 15, and the rotor magnetic ring is fixedly disposed on the rotor yoke 161 circumferentially. The rotor magnetic ring is disposed on the lower surface of the rotor yoke 161 and faces the housing 2.

[0029] A stator mounting groove 18 is provided on the housing 2 around the pump shaft 6, that is, the stator mounting groove 18 is arranged in a ring around the mounting base 7. The top of the stator mounting groove 18 is open. A stator module 19 is provided in the stator mounting groove 18. The stator module 19 is arranged opposite to the rotor module 16. A stator shielding plate 20 is provided on the housing 2 to close the stator mounting groove 18. The stator shielding plate 20 is arranged in a ring.

[0030] In one embodiment, the stator shielding plate 20 is fixed to the housing 2 by welding. In another embodiment, the stator shielding plate 20 is fixed to the end face of the housing 2 by end face pressing, and the contact surface between the stator shielding plate 20 and the housing 2 is sealed by a sealing ring. The stator shielding plate 20 is used to close the slot of the stator mounting groove 18 so that the stator module 19 is sealed in the stator mounting groove 18, ensuring that the external conveying medium will not come into contact with the stator module 19. The specific implementation method can be selected according to the actual situation.

[0031] In one embodiment, the stator module 19 includes a stator core 191 and a stator winding 192. The stator core 191 is fixedly disposed in the stator mounting slot 18, and the stator winding 192 is disposed on the stator core 191.

[0032] An electrical gap is formed between the stator shielding plate 20 and the rotor shielding sleeve 17. When current is passed through the stator module 19, the rotating magnetic field generated by the stator module 19 interacts with the inherent magnetic field of the rotor magnet 162 on the rotor module 16, forming an electromagnetic torque that drives the rotor module 16 to rotate. In turn, the rotor module 16 drives the impeller 9 to rotate, thereby realizing the conversion of electrical energy into mechanical energy.

[0033] When the impeller 9 is mounted on the pump shaft 6 via the sliding bearing 10, the impeller 9 has a certain vertical floating space, and there is also a certain gap between the lower surface of the impeller 9 and the upper surface of the mounting base 7 of the housing 2. In order to further balance the axial force of the impeller 9 on the pump shaft 6, a lower magnetic levitation magnet 22 is embedded in the mounting base 7, and an upper magnetic levitation magnet 21 is provided on the surface of the impeller 9 facing the housing 2. The upper magnetic levitation magnet 21 and the lower magnetic levitation magnet 22 are arranged opposite each other, with the same pole facing each other, so that the upper magnetic levitation magnet 21 and the lower magnetic levitation magnet 22 generate a repulsive force, and a magnetic levitation gap is formed between the upper magnetic levitation magnet 21 and the lower magnetic levitation magnet 22.

[0034] Reference Figure 3 and Figure 4 As shown, the side wall of the pump housing 1 is provided with an upper water passage 23, which is connected to the pump chamber 3. The side wall of the housing 2 is provided with a lower water passage 24, and the bottom of the housing 2 is provided with a cooling water passage 25. When the housing 2 is assembled on the pump housing 1, one end of the lower water passage 24 is connected to the upper water passage 23, and the other end of the lower water passage 24 is connected to the cooling water passage 25.

[0035] The pump shaft 6 has a circulation channel 26 along its axial direction at its center. One end of the circulation channel 26 is connected to the cooling water channel 25, and the other end of the circulation channel 26 is connected to the side wall of the pump shaft 6. The circulation channel 26 extends along the end of the pump shaft 6 to the position of the sliding bearing 10.

[0036] In one embodiment, the cooling water passage 25 includes at least one concentrically arranged annular water passage 251. Adjacent annular water passages 251 are connected by a connecting water passage 252. The lower water inlet 24 is connected to the outermost annular water passage 251, and the circulation channel 26 is connected to the innermost annular water passage 251. It is worth noting that the connection between the lower water inlet 24 and the outermost annular water passage 251 is far away from the connecting water passage 252 of the outermost annular water passage 251. The connecting water passage 252 of the outermost annular water passage 251 is far away from the connecting water passage 252 of the innermost annular water passage 251. The connecting water passage 252 of the innermost annular water passage 251 and the connection between the circulation channel 26 and the innermost annular water passage 251 are far away from each other.

[0037] In another embodiment, the cooling water passage 25 is arranged in a spiral shape, with one end of the cooling water passage 25 connected to the other end of the lower water inlet 24, and the other end of the cooling water passage 25 connected to one end of the circulation channel 26. No accompanying drawings are shown in this embodiment.

[0038] With the above configuration, the conveying medium enters from the upper water passage 23 to the lower water passage 24. As the lower water passage 24 enters the annular water passage 251, the conveying medium can travel through the entire annular water passage 251 before entering the next layer of annular water passage 251, and then be discharged from the circulation channel 26 after passing through the entire annular water passage 251.

[0039] The conveying medium discharged through the circulation channel 26 enters the sliding bearing 10, which can lubricate the sliding bearing 10. A part of the conveying medium is discharged from between the upper thrust bearing 11 and the sliding bearing 10, and another part of the conveying medium is discharged from between the lower thrust bearing 12 and the sliding bearing 10, thereby completing the circulation of the conveying medium in the canned pump.

[0040] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A modular suspended axial flux shielded pump, comprising a pump housing (1) and a casing (2) mounted on the pump housing (1), wherein a pump chamber (3) is provided inside the pump housing (1), an inlet (4) is provided on the end face of the pump housing (1), and an outlet (5) is provided on the side of the pump housing (1), characterized in that, A pump shaft (6) is fixedly installed at the center of the housing (2). The pump shaft (6) extends into the pump chamber (3). An impeller (9) is rotatably mounted on the pump shaft (6) inside the pump chamber (3). A rotor mounting groove (15) is provided on the surface of the impeller (9) facing the housing (2). A rotor module (16) is provided in the rotor mounting groove (15). A rotor shielding sleeve (17) is provided on the impeller (9) to close the rotor mounting groove (15). The housing (2) is provided with a stator mounting groove (18) around the pump shaft (6), and a stator module (19) is provided in the stator mounting groove (18). The stator module (19) is arranged opposite to the rotor module (16). The housing (2) is provided with a stator shielding plate (20) that closes the stator mounting groove (18).

2. The modular suspended axial flux shielded pump according to claim 1, characterized in that, The impeller (9) has a mounting cavity at its center, in which a sliding bearing (10) is fixedly installed. The sliding bearing (10) is sleeved on the pump shaft (6). An upper thrust bearing (11) is sleeved on the pump shaft (6) and abuts against the upper end of the sliding bearing (10). A lower thrust bearing (12) is sleeved on the pump shaft (6) and abuts against the lower end of the sliding bearing (10). An anti-detachment part is provided at the end of the pump shaft (6).

3. A modular suspended axial flux shielded pump according to claim 2, characterized in that, The anti-detachment part includes an anti-detachment ring groove (13) formed at the end of the pump shaft (6) and an anti-detachment retaining ring (14) that is snapped into the anti-detachment ring groove (13).

4. A modular suspended axial flux shielded pump according to claim 1, characterized in that, The housing (2) has a mounting base (7) at its center, and the mounting base (7) has a mounting hole (8) at its center. The pump shaft (6) is interference-fitted into the mounting hole (8).

5. A modular suspended axial flux shielded pump according to claim 4, characterized in that, The mounting base (7) is fitted with a lower magnetic levitation magnet (22), and the impeller (9) is provided with an upper magnetic levitation magnet (21) on the surface facing the housing (2). The upper magnetic levitation magnet (21) and the lower magnetic levitation magnet (22) are arranged opposite to each other, and a magnetic levitation gap is formed between the upper magnetic levitation magnet (21) and the lower magnetic levitation magnet (22).

6. A modular suspended axial flux shielded pump according to claim 1, characterized in that, The rotor module (16) includes a rotor yoke (161) and a rotor magnet (162). The rotor yoke (161) is fixedly disposed in the rotor mounting groove (15), and the rotor magnet (162) is fixedly disposed on the rotor yoke (161).

7. A modular suspended axial flux shielded pump according to claim 1, characterized in that, The stator module (19) includes a stator core (191) and a stator winding (192). The stator core (191) is fixedly disposed in the stator mounting slot (18), and the stator winding (192) is disposed on the stator core (191).

8. A modular suspended axial flux shielded pump according to claim 2, characterized in that, The side wall of the pump casing (1) is provided with an upper water passage (23), which is connected to the pump cavity (3). The side wall of the machine casing (2) is provided with a lower water passage (24). The bottom of the machine casing (2) is provided with a cooling water passage (25). One end of the lower water passage (24) is connected to the upper water passage (23), and the other end of the lower water passage (24) is connected to the cooling water passage (25). A circulation channel (26) is provided at the center of the pump shaft (6) along its axial direction. One end of the circulation channel (26) is connected to the cooling water channel (25), and the other end of the circulation channel (26) is connected to the side wall of the pump shaft (6).

9. A modular suspended axial flux shielded pump according to claim 8, characterized in that, The cooling water passage (25) includes at least one concentric annular water passage (251), adjacent annular water passages (251) are connected by a connecting water passage (252), the lower water passage (24) is connected to the outermost annular water passage (251), and the circulation channel (26) is connected to the innermost annular water passage (251).

10. A modular suspended axial flux shielded pump according to claim 8, characterized in that, The cooling water passage (25) is arranged in a spiral shape. One end of the cooling water passage (25) is connected to the other end of the lower water inlet (24), and the other end of the cooling water passage (25) is connected to one end of the circulation channel (26).

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