Self-cooling electromagnetic direct-drive high-speed centrifugal pump with inducer and impeller adjusted in split mode

Abstract

The invention discloses a self-cooling electromagnetic direct-drive high-speed centrifugal pump with an inducer and an impeller adjusted in a split mode, and belongs to the technical field of centrifugal pumps. A self-cooling electromagnetic direct-drive high-speed centrifugal pump with an inducer and an impeller adjusted separately comprises a pump body and a driving assembly arranged on the pump body, the driving assembly comprises a driving shaft, the impeller is arranged on the periphery of the end, close to the pump body, of the driving shaft, a bearing assembly is installed on the periphery of the driving shaft, and the inducer and the impeller are arranged on the bearing assembly. A stator assembly connected with the pump body is arranged on the bearing assembly, and a pair of rotor assemblies is arranged on the periphery of the driving shaft. Through the design of a flow channel, a liquid cavity and a cooling channel on the stator assembly, the efficient self-cooling function is realized, the temperature of an electromagnetic part is effectively reduced, performance reduction and even damage caused by overheating are prevented, the service life of equipment is prolonged, and the stability and safety of operation are improved; the electromagnetic direct drive technology is adopted, the impeller is directly driven to rotate, and a complex transmission structure in a traditional centrifugal pump is reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of centrifugal pumps, and particularly relates to a self-cooling electromagnetic direct-drive high-speed centrifugal pump with a separately adjustable inducer and impeller. Background Art

[0002] In the technical field of centrifugal pumps, with the continuous progress of industrial technology and the increasing growth of application requirements, higher and higher requirements are put forward for the performance, stability and efficiency of centrifugal pumps. Traditional centrifugal pump designs often have problems such as poor heat dissipation effect, complex structure, and difficult maintenance, which limit their application in some high-demand occasions.

[0003] To solve these problems, people began to explore the use of electromagnetic direct-drive technology, which directly drives the impeller of the centrifugal pump to rotate through electromagnetic force, thus simplifying the transmission structure and improving the transmission efficiency. However, electromagnetic direct-drive technology also brings new challenges, such as heat dissipation of electromagnetic components, gap control between the rotor and the stator, etc.

[0004] In the existing electromagnetic direct-drive high-speed centrifugal pump designs, a cooling system is usually used to reduce the temperature of electromagnetic components and prevent performance degradation or even damage caused by overheating. However, these cooling systems often have complex structures, increasing the overall volume and weight of the pump, as well as the manufacturing cost and maintenance difficulty. Summary of the Invention

[0005] The purpose of the present invention is to address the problems existing in the prior art, and provide a self-cooling electromagnetic direct-drive high-speed centrifugal pump with a separately adjustable inducer and impeller.

[0006] To achieve the above purpose, the invention is realized by the following technical solutions: A self-cooling electromagnetic direct-drive high-speed centrifugal pump with a separately adjustable inducer and impeller, comprising a pump body, and a driving assembly arranged on the pump body. An end cover is provided at one end of the driving assembly away from the pump body. The driving assembly includes a driving shaft. An impeller is provided on the outer periphery of the driving shaft near the pump body end. A bearing assembly is installed on the outer periphery of the driving shaft. A stator assembly connected to the pump body is provided on the bearing assembly. A flow channel is provided in the stator assembly. A pair of rotor assemblies are provided on the outer periphery of the driving shaft. The pair of rotor assemblies are located on both sides of the bearing member. A first flow gap is provided between the rotor assembly close to the pump body and the stator assembly. A second flow gap is provided between the rotor assembly close to the end cover and the stator assembly. Both ends of the flow channel are respectively communicated with the first flow gap and the second flow gap. A liquid chamber is provided between the end face of the stator assembly close to the pump body end and the pump body. The liquid chamber is communicated with the first flow gap. A flow chamber is provided in the stator assembly. The flow chamber is communicated with the second flow gap. A cooling channel communicating with the flow chamber and the liquid chamber is provided on the driving shaft.

[0007] By adopting the above technical solutions, the present invention provides a centrifugal pump with a novel structure, which is characterized in that the inducer and the impeller can be adjusted separately and are driven by an electromagnetic direct drive method, greatly improving the operating efficiency and stability of the pump. At the same time, the cooling system provided on the pump body effectively improves the heat dissipation performance of the motor, reduces the operating temperature, avoids failures and damages caused by high temperature, extends the service life, ensures stability and safety under high loads, and meets the requirements of industrial production.

[0008] Optionally, the bearing assembly includes a shaft sleeve, a bearing liner, a rotor ring and a thrust disk. The inner circumference of the shaft sleeve is connected to the outer circumference of the driving shaft, the outer circumference of the shaft sleeve is connected to the bearing liner, the rotor rings connected to the outer circumference of the shaft sleeve are installed on both sides of the bearing liner, the thrust disk that fits against both ends of the shaft sleeve is installed on the outer circumference of the driving shaft, and the outer circumference of the bearing liner is connected to the stator assembly.

[0009] By adopting the above technical solutions, the detailed design of the bearing assembly, including components such as the shaft sleeve, the bearing liner, the rotor ring and the thrust disk, effectively supports the rotation of the driving shaft, reduces friction and wear at the same time, and improves the service life of the pump. In addition, the connection method between the bearing assembly and the stator assembly ensures the smoothness and efficiency of the pump during operation.

[0010] Optionally, the stator assembly includes a housing, an inner shaft seat, a pair of annular partitions, end plates, a pair of stator cores and coils. The housing is connected to the pump body, an end plate is installed at one end of the housing away from the pump body, a pair of annular partitions are installed on the inner wall of the housing, the inner shaft seat is installed between the pair of annular partitions, the inner shaft seat is connected to the bearing assembly, several flow channels are provided on the inner circumferential wall of the inner shaft seat, a pair of stator cores are respectively installed on the inner shaft seat, the coils are wound around the pair of stator cores, and rib plate structures are provided on the pair of annular partitions.

[0011] By adopting the above technical solutions, the structural design of the stator assembly, including components such as the housing, the inner shaft seat, the annular partitions, the end plates, the stator cores and the coils, provides a stable electromagnetic driving force for the pump. The design of the flow channels on the inner shaft seat helps the smooth flow of the fluid and improves the hydrodynamic performance of the pump.

[0012] Optionally, a stator cavity is provided between the side walls of the pair of annular partitions, the outer circumference of the inner shaft seat and the inner circumference of the housing. The stator cores and the coils are located in the stator cavity, and wire holes are provided on the side walls of the housing.

[0013] By adopting the above technical solutions, the arrangement of the stator core and the coil in the stator cavity, as well as the wire hole design on the side wall of the housing, provide the necessary electrical connection for electromagnetic drive, while ensuring the safety and reliability of the pump during operation. The setting of the stator cavity can prevent the cooling liquid from entering between the coil and the stator core and causing damage to the coil and the stator core.

[0014] Optionally, the space between the annular partition and the end plate on the side close to the end cover is a flow cavity; the rotor assembly on the side close to the end cover is located in the flow cavity.

[0015] By adopting the above technical solutions, the design of the flow cavity enables the rotor assembly close to the end cover to rotate smoothly therein, and at the same time communicates with the second flow gap between the stator assembly, realizing the effective circulation and exchange of fluids and improving the working efficiency of the pump.

[0016] Optionally, the inner wall of the end plate is conical, the center point of the end plate is coaxial with the driving shaft, and the minimum distance between the end plate and the driving shaft is 2 cm - 10 cm.

[0017] By adopting the above technical solutions, the conical design of the inner wall of the end plate and the control of the minimum distance from the driving shaft optimize the fluid flow path, increase the pressure at the minimum distance between the end plate and the driving shaft, and can effectively promote the circulating flow of the fluid.

[0018] Optionally, the rotor assembly includes a rotor plate, a rotor core, a permanent magnet and a sealing plate. The inner circumference of the rotor plate is connected to the driving shaft. A rotor slot is provided on the surface of the rotor plate close to the stator assembly. The rotor core is installed in the rotor slot. The permanent magnet is installed on the surface of the rotor core. The sealing plate is installed on the surface of the rotor plate and closes the rotor slot.

[0019] By adopting the above technical solutions, the structural design of the rotor assembly, including components such as the rotor plate, the rotor core, the permanent magnet and the sealing plate, provides a stable electromagnetic driving force for the pump. The setting of the rotor slot and the permanent magnet ensures the effective electromagnetic coupling between the rotor assembly and the stator assembly.

[0020] Optionally, a plurality of arc-shaped flow channels are provided on the surface of the rotor plate away from the rotor slot. The plurality of arc-shaped flow channels are distributed in a circular array with the center point of the end face of the rotor plate as the base point.

[0021] By adopting the above technical solutions, the design of the arc-shaped flow channels on the rotor plate further optimizes the fluid flow path, improves the hydrodynamic performance of the pump. At the same time, the circular array distribution of the arc-shaped flow channels ensures the uniform distribution and flow of the fluid around the rotor assembly.

[0022] Optionally, a liquid inlet pipe communicating with the liquid chamber is provided on the pump body, a flow channel groove is formed on the side wall of the pump body, the flow channel groove is located in the liquid chamber, and a liquid discharge pipe communicating with the flow channel groove is installed on the pump body.

[0023] By adopting the above technical solutions, the design of the liquid inlet pipe and the liquid discharge pipe on the pump body, as well as the setting of the flow channel groove, provide necessary fluid inlets, outlets and fluid channels for the pump, ensuring fluid circulation and exchange during the operation of the pump. At the same time, the opening position of the flow channel groove also optimizes the fluid flow path.

[0024] Optionally, the cooling channel includes two central flow channels and a Tesla flow channel. The two central flow channels are respectively arranged at both ends of the driving shaft, and the two central flow channels are communicated through the Tesla flow channel. The central flow channel near one end of the pump body is communicated with the liquid chamber, and the central flow channel near one end of the end cover is connected with the flow chamber.

[0025] By adopting the above technical solutions, the design of the cooling channel, including components such as two central flow channels and a Tesla flow channel, provides an effective self-cooling system for the pump. Through the connection of the cooling channel with the liquid chamber and the flow chamber, heat transfer and heat dissipation effects during the operation of the pump are realized, improving the working efficiency and stability of the pump. The design of the Tesla flow channel utilizes the kinetic energy and pressure difference of the fluid to realize the one-way flow and automatic regulation of the fluid, further improving the efficiency and stability of the cooling system.

[0026] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0027] 1. Through the design of the flow channel, liquid chamber and cooling channel on the stator assembly, the present invention realizes an efficient self-cooling function, effectively reduces the temperature of electromagnetic components, prevents performance degradation or even damage caused by overheating, extends the service life of the equipment, and improves the operation stability and safety. At the same time, by adopting the electromagnetic direct drive technology, the impeller is directly driven to rotate, reducing the complex transmission structure in traditional centrifugal pumps, improving the transmission efficiency, reducing the volume and weight of the equipment, simplifying the maintenance process, and reducing the maintenance cost.

[0028] 2. The design of the flow channel on the shaft seat in the stator assembly and the arc-shaped flow channel distribution on the rotor plate optimize the fluid flow path, reduce the flow resistance, and improve the hydrodynamic performance of the pump. The conical design of the inner wall of the end plate and the control of the minimum distance between the end plate and the driving shaft not only optimize the fluid flow, but also increase the pressure in a specific area, promoting the circulating flow of the fluid and further improving the working efficiency of the pump.

[0029] 3. The sealing plate fits tightly on the surface of the rotor plate and seals the rotor slots, effectively preventing fluid or impurities from entering the rotor slots, keeping the inside of the rotor slots clean and dry. The annular partition is installed on the inner wall of the housing, forming a solid barrier with the stator assembly, isolating the stator cavity from the external environment and avoiding electromagnetic field interference in the stator cavity. The combined effect of these two sealing measures significantly enhances the tightness of the rotor slots and the stator cavity, ensuring the energy transfer efficiency and stability during the electromagnetic drive process and improving the working efficiency and performance of the pump.

[0030] 4. The cooling channel includes two sections of central flow channels and Tesla flow channels. Through the design of the Tesla flow channels, using the kinetic energy and pressure difference of the fluid, the unidirectional flow and automatic regulation of the fluid are achieved, further improving the efficiency and stability of the cooling system, ensuring that the equipment maintains an appropriate temperature during high-load operation, and improving the overall performance and reliability of the equipment. Brief Description of the Drawings

[0031] Figure 1 is a schematic diagram of the overall structure of the centrifugal pump of the present invention;

[0032] Figure 2 is a schematic diagram of the cross-sectional structure of the centrifugal pump of the present invention;

[0033] Figure 3 is a schematic diagram of the heat dissipation path of the present invention;

[0034] Figure 4 is a schematic diagram of the cross-sectional structure of the driving shaft of the present invention;

[0035] Figure 5 is a schematic diagram of the cross-sectional structure of the rotor assembly of the present invention;

[0036] Figure 6 is a schematic diagram of the cross-sectional structure of the stator assembly of the present invention;

[0037] Figure 7 is a schematic diagram of the cross-sectional structure of the bearing assembly of the present invention;

[0038] Figure 8 is a schematic diagram of the housing structure in the second embodiment of the present invention;

[0039] Figure 9 of the present invention Figure 8 is an enlarged schematic diagram at position A.

[0040] In the figure: 1. Pump body; 101. Liquid inlet pipe; 102. Flow channel groove; 103. Liquid discharge pipe; 2. Driving assembly; 3. End cover; 4. Driving shaft; 5. Impeller; 6. Bearing assembly; 61. Sleeve; 62. Bearing lining; 63. Rotor ring; 64. Thrust disk; 7. Stator assembly; 71. Housing; 72. Inner shaft seat; 73. Annular partition; 74. End plate; 75. Stator core; 76. Coil; 77. Stator cavity; 78. Wire hole; 8. Flow passage; 9. Rotor assembly; 91. Rotor plate; 92. Rotor core; 93. Permanent magnet; 94. Sealing plate; 95. Rotor groove; 96. Arc-shaped flow channel; 10. First flow gap; 11. Second flow gap; 13. Liquid cavity; 14. Flow cavity; 15. Cooling channel; 151. Central flow channel; 152. Tesla flow channel; 16. Rib plate structure; 1601. Rib plate segment. Detailed implementation manners

[0041] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0042] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "middle", "upper", "lower", "left", "right", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0043] As Figure 1 —shown in FIG. 7, the specific solution of the embodiment is as follows: A self-cooling electromagnetic direct-drive high-speed centrifugal pump with a separately adjustable inducer and impeller, including a pump body 1. The pump body 1 is the main structure of the entire centrifugal pump, used to accommodate fluid and guide the fluid to flow in from the liquid inlet pipe 101. After being pressurized by the inducer and the impeller 5, it is discharged from the liquid discharge pipe 103, providing a closed environment for the fluid flow, ensuring the orderly flow of the fluid and the efficient operation of the pump. The pump body 1 is provided with a liquid inlet pipe 101 communicating with the liquid cavity 13. The liquid inlet pipe 101 serves as a channel for the fluid to enter the pump body 1 and guides the external fluid to the inducer.

[0044] An inducer is installed in the liquid inlet pipe 101. The liquid guide grooves formed on the outer peripheral wall of the inducer can guide the fluid to flow in a specific manner, increasing the kinetic energy of the fluid, providing assistance for the subsequent pressurization of the impeller 5, improving the fluid inlet efficiency, reducing energy loss, enhancing the suction and pressurization effects of the pump. A number of liquid guide grooves are formed on the outer peripheral wall of the inducer. The liquid guide grooves are special structures on the outer peripheral wall of the inducer for changing the flow direction of the fluid and increasing the kinetic energy of the fluid. A flow channel groove 102 is formed on the side wall of the pump body 1. The flow channel groove 102 is circumferentially distributed on the inner side wall of the pump body 1. The flow channel groove 102 is located in the liquid cavity 13. The flow channel groove 102 is circumferentially distributed on the inner side wall of the pump body 1 and is located in the liquid cavity 13, providing an orderly flow path for the fluid. A liquid discharge pipe 103 communicated with the flow channel groove 102 is installed on the pump body 1. The liquid discharge pipe 103 is communicated with the flow channel groove 102 to discharge the fluid pressurized by the inducer and the impeller 5 from the pump body 1.

[0045] And a driving assembly 2 is provided on the pump body 1. The driving assembly 2 is the power source of the centrifugal pump, responsible for driving the rotation of the driving shaft 4 and the impeller 5, thereby realizing the pressurization and discharge of the fluid. By providing stable power, the continuous and efficient operation of the centrifugal pump is ensured. One end of the driving assembly 2 away from the pump body 1 is provided with an end cover 3. The end cover 3 protects the internal structure of the driving assembly 2, improving the overall stability and durability of the pump.

[0046] The driving assembly 2 includes a driving shaft 4. The driving shaft 4 is the core component of the driving assembly 2, responsible for transmitting power from the driving source to the impeller 5 and driving the rotation of the impeller 5. Through stable rotation, the pressurization and discharge of the fluid are realized, ensuring the efficient operation of the pump. The outer periphery of one end of the driving shaft 4 close to the pump body 1 is provided with an impeller 5. The impeller 5 is located in the flow channel groove 102, and there is a gap between the impeller 5 and the flow channel groove 102. The impeller 5 is located in the flow channel groove 102 but there is a gap therebetween. This gap ensures that the impeller 5 will not rub against the flow channel groove 102 during rotation and also provides a gap for subsequent heat dissipation. The impeller 5 is one of the key components of the centrifugal pump. The impeller 5 pressurizes the fluid by rotation. When the fluid flows through the impeller 5, the blades of the impeller 5 will push the fluid to rotate and increase its pressure and speed.

[0047] A bearing assembly 6 is mounted on the outer periphery of the driving shaft 4. The bearing assembly 6 is a key component in the centrifugal pump for supporting and positioning the driving shaft 4. It ensures the stability and accuracy of the driving shaft 4 during rotation. By providing stable support and positioning, the bearing assembly 6 reduces the vibration and friction of the driving shaft 4 during rotation, improving the overall performance and durability of the pump. The bearing assembly 6 includes a shaft sleeve 61, a bearing lining 62, a rotor ring 63, and a thrust disk 64. The inner periphery of the shaft sleeve 61 is connected to the outer periphery of the driving shaft 4. The shaft sleeve 61 can prevent fluids and impurities from directly contacting the driving shaft 4, reducing the wear and corrosion of the driving shaft 4. At the same time, the shaft sleeve 61 also provides additional support, enhancing the stability of the driving shaft 4. The outer periphery of the shaft sleeve 61 is connected to the bearing lining 62. The bearing lining 62 can withstand the radial and axial forces generated by the driving shaft 4 during rotation, ensuring the smooth rotation of the driving shaft 4. At the same time, the wear resistance and corrosion resistance of the bearing lining 62 also improve the overall durability of the pump;

[0048] Rotor rings 63 connected to the outer periphery of the shaft sleeve 61 are mounted on both sides of the bearing lining 62. The rotor rings 63 cooperate with the stator assembly 7 to achieve electromagnetic drive, converting electrical energy into mechanical energy to drive the rotation of the driving shaft 4. A thrust disk 64 that fits against both ends of the shaft sleeve 61 is mounted on the outer periphery of the driving shaft 4. The thrust disk 64 can prevent the driving shaft 4 from bending or being damaged due to excessive axial force, ensuring the smooth rotation of the driving shaft 4 and the long-term stable operation of the pump. The outer periphery of the bearing lining 62 is connected to the stator assembly 7. Through a firm connection, the bearing assembly 6 can resist external stress and vibration, improving the overall rigidity and stability of the pump. At the same time, this connection also facilitates the maintenance and replacement of the bearing assembly 6.

[0049] The bearing assembly 6 is provided with a stator assembly 7 connected to the pump body 1. The stator assembly 7 is the core component of the electromagnetic direct-drive high-speed centrifugal pump. It cooperates with the rotor ring 63 in the bearing assembly 6 to realize the conversion of electrical energy into mechanical energy through the principle of electromagnetic induction, thereby driving the rotation of the driving shaft 4. The stator assembly 7 includes a housing 71, an inner shaft seat 72, a pair of annular partitions 73, end plates 74, a pair of stator cores 75, and coils 76. The housing 71 is connected to the pump body 1. The housing 71 is the main structure of the stator assembly 7. It connects the pump body 1 and provides an installation space for components such as the stator core 75 and the coils 76. At the same time, the housing 71 also plays a role in protection and support to ensure the stability of the entire drive system. One end of the housing 71 away from the pump body 1 is installed with an end plate 74. The end plate 74 is installed at one end of the housing 71 away from the pump body 1 and is connected to the end cover 3. It plays a role in sealing and support, and at the same time prevents fluids and impurities from entering the interior of the stator assembly 7. The end cover 3 is connected to the end plate 74. The inner wall of the end plate 74 is conical. The center point of the end plate 74 is coaxial with the driving shaft 4. The minimum distance between the end plate 74 and the driving shaft 4 is 2 cm - 10 cm. The inner wall of the end plate 74 is conical and coaxial with the driving shaft 4. This design can reduce the eddy current and energy loss of the fluid at the end plate 74 and improve the efficiency of the pump. In addition, the design of the minimum distance between the end plate 74 and the driving shaft 4 can increase the pressure of the liquid entering the driving shaft 4;

[0050] A pair of the annular partitions 73 are installed on the inner wall of the housing 71. The pair of annular partitions 73 are installed on the inner wall of the housing 71 for isolating and supporting the stator cores 75. At the same time, they also play a role in preventing fluids and impurities from entering the interior of the stator assembly 7. The inner shaft seat 72 is installed between the pair of annular partitions 73. The inner shaft seat 72 is connected to the bearing lining 62. The pair of stator cores 75 are respectively installed on the inner shaft seat 72. The inner shaft seat 72 is installed between the pair of annular partitions 73 and is connected to the bearing lining 62. It plays a role in supporting and positioning the stator cores 75 to ensure the stability and accuracy of the stator cores 75 during rotation. The coils 76 are wound around the pair of stator cores 75. The stator cores 75 and the coils 76 are the core components of the electromagnetic drive system. The coils 76 are wound around the stator cores 75. When energized, a magnetic field is generated, which interacts with the permanent magnets 93 in the rotor assembly 9 to generate an electromagnetic force to drive the rotation of the driving shaft 4. A stator cavity 77 is provided between the side walls of the pair of annular partitions 73, the outer periphery of the inner shaft seat 72, and the inner periphery of the housing 71. The stator cavity 77 provides an installation space for the stator cores 75 and the coils 76 and ensures the stability and sealing of the electromagnetic drive system. The stator cores 75 and the coils 76 are located in the stator cavity 77. A wire hole 78 is provided on the side wall of the housing 71. The wire hole 78 is used to introduce the power supply wire of the coils 76 into the stator cavity 77.

[0051] The stator assembly 7 is provided with flow channels 8. The flow channels 8 provided on the stator assembly 7 are mainly used to optimize the fluid flow in the pump body 1, reduce the flow resistance, and improve the efficiency of the pump. These channels can also help with heat dissipation and reduce the operating temperature of the stator assembly 7. A plurality of flow channels 8 are formed on the inner peripheral wall of the inner shaft seat 72, and the plurality of flow channels 8 are distributed in a circular array. The design of distributing the plurality of flow channels 8 formed on the inner peripheral wall of the inner shaft seat 72 in a circular array can ensure the uniform distribution of the fluid in the pump body 1 and increase the heat dissipation area. A pair of rotor assemblies 9 are provided on the outer periphery of the drive shaft 4. The rotor assembly 9 is one of the key components in the electromagnetic direct-drive high-speed centrifugal pump. It cooperates with the stator assembly 7 to achieve the conversion of electrical energy into mechanical energy. The permanent magnet 93 in the rotor assembly 9 is subjected to a force in the magnetic field generated by the stator assembly 7, thereby driving the drive shaft 4 to rotate;

[0052] The rotor assembly 9 includes a rotor plate 91, a rotor iron core 92, a permanent magnet 93, and a sealing plate 94. The inner periphery of the rotor plate 91 is connected to the drive shaft 4. The rotor plate 91 plays a role in supporting and transmitting torque. A rotor slot 95 is formed on one side of the rotor plate 91 close to the stator assembly 7. The rotor iron core 92 is installed in the rotor slot 95. The rotor iron core 92 installed in the rotor slot 95 is used to enhance the magnetic field effect of the permanent magnet 93 and improve the electromagnetic induction efficiency. The permanent magnet 93 is installed on the surface of the rotor iron core 92. The sealing plate 94 is installed on the surface of the rotor plate 91 and closes the rotor slot 95. When the coil 76 in the stator assembly 7 is energized, a magnetic field will be generated around the stator iron core 75. This magnetic field will interact with the permanent magnet 93 in the rotor assembly 9 to generate an electromagnetic force to drive the drive shaft 4 to rotate. The design of the rotor assembly 9 needs to ensure that the force on the permanent magnet 93 in the stator magnetic field is uniform to reduce vibration and noise. At the same time, the design of the sealing plate 94 needs to ensure the internal sealing of the rotor assembly 9 to prevent the erosion of the permanent magnet 93 and the rotor iron core 92 by the fluid and impurities.

[0053] On one side of the rotor plate 91 away from the rotor slot 95, there are a number of arc-shaped flow channels 96. The a number of arc-shaped flow channels 96 are distributed in a circular array with the center point of the end face of the rotor plate 91 as the base point. The a number of arc-shaped flow channels 96 are mainly used to optimize the flow of fluid around the rotor assembly 9, reduce the flow resistance, and improve the efficiency of the pump. The design of these arc-shaped flow channels 96 can also help with heat dissipation, reduce the working temperature of the rotor assembly 9, and can also accelerate the flow of the liquid. A pair of the rotor assemblies 9 are located on both sides of the bearing assembly 6. There is a first flow gap 10 between the rotor assembly 9 close to the pump body 1 and the stator assembly 7. The gap between the sealing plate 94 at one end close to the pump body 1 and the annular partition 73 at one end close to the pump body 1 is the first flow gap 10. The design of the first flow gap 10 allows fluid to flow from the liquid chamber 13 into the area between the rotor assembly 9 and the stator assembly 7. There is a second flow gap 11 between the rotor assembly 9 close to the end cover 3 and the stator assembly 7. The gap between the sealing plate 94 on one side close to the end cover 3 and the annular partition 73 on one side close to the end cover 3 is the second flow gap 11. Both ends of the flow channel 8 are respectively communicated with the first flow gap 10 and the second flow gap 11. There is a liquid chamber 13 between the end face of the stator assembly 7 close to the pump body 1 and the pump body 1. The rotor assembly 9 close to the pump body 1 is located in the liquid chamber 13. The liquid chamber 13 is communicated with the first flow gap 10. There is a flow chamber 14 in the stator assembly 7. The space between the annular partition 73 on the side close to the end cover 3 and the end plate 74 is the flow chamber 14; the rotor assembly 9 on the side close to the end cover 3 is located in the flow chamber 14. The flow chamber 14 is communicated with the second flow gap 11; both ends of the flow channel 8 on the stator assembly 7 are respectively communicated with the first flow gap 10 and the second flow gap 11. Such a design allows fluid to flow freely between the stator assembly 7, the rotor assembly 9, and the pump body 1, forming a complete hydrodynamic system.

[0054] There is a cooling channel 15 on the driving shaft 4 that is communicated with the flow chamber 14 and the liquid chamber 13. The cooling channel 15 includes two sections of central flow channels 151 and Tesla flow channels 152. The two sections of central flow channels 151 are respectively arranged at both ends of the driving shaft 4. The two sections of central flow channels 151 are communicated through the Tesla flow channels 152. The Tesla flow channels 152 are composed of a plurality of Tesla valves. The central flow channel 151 close to the pump body 1 is communicated with the liquid chamber 13. The central flow channel 151 close to the end cover 3 is connected to the flow chamber 14;

[0055] By combining the design of the central flow channel 151 and the Tesla flow channel 152, the cooling channel 15 on the drive shaft 4 can provide an efficient heat dissipation path. The cooling fluid enters the central flow channel 151 at one end close to the end cover 3 from the flow cavity 14, then flows through the Tesla flow channel 152 to the central flow channel 151 at one end close to the pump body 1, and finally drains into the liquid cavity 13. During this process, the cooling fluid absorbs the heat of the drive shaft 4 and surrounding components and takes it away, thus ensuring the stable operation of the pump.

[0056] Embodiment 2, as Figure 8 —9 shows that in some embodiments, a rib structure 16 is further provided on a pair of the annular partitions 73. The rib structure 16 includes rib plates 1601 installed on opposite sides of a pair of the annular partitions 73. The number of the rib plates 1601 is several, and several of the rib plates 1601 are distributed in an annular array with the center of the annular partition 73 as the base point. Several of the rib plates 1601 are respectively in contact with the stator core 75. The design of the rib structure 16 is used to enhance the structural strength of the annular partition 73, prevent deformation or damage under high-speed rotation and fluid impact, and ensure the stability of the stator assembly 7. At the same time, the rib plates 1601 have good thermal conductivity and can quickly conduct and dissipate the heat generated by the stator core 75 during operation, effectively reducing the working temperature of the stator core 75, improving the electromagnetic conversion efficiency and service life. In addition, the close contact between the rib plates 1601 and the stator core 75 can also improve the heat transfer efficiency between the two, further optimizing the heat dissipation performance and ensuring the stability and reliability of the centrifugal pump during long-term operation.

[0057] The working principle of the above embodiments is as follows:

[0058] Start the motor. The coils 76 in the stator assembly 7 form a stator winding through the stator core 75. When the stator winding is energized, a rotating magnetic field is generated, providing a basis for electromagnetic drive;

[0059] The magnetic field generated by the stator winding interacts with the permanent magnets 93 in the rotor assembly 9 to form a torque that drives the rotor assembly 9 to rotate. The rotation of the rotor assembly 9 drives the drive shaft 4 and the impeller 5 to rotate;

[0060] As the impeller 5 rotates, the fluid is thrown into the space between the rotor assembly 9 and the impeller 5, is pressurized under the action of centrifugal force, and the pressurized fluid passes through the flow channel groove 102 of the pump body 1 and is finally discharged through the drain pipe 103;

[0061] For the liquid located between the rotor assembly 9 and the impeller 5, while the rotor assembly 9 rotates, the liquid in the arc-shaped flow channel 96 on the rotor plate 91 is also under the action of centrifugal force and is thrown towards the outer edge of the rotor plate 91;

[0062] The liquid at the outer edge of the rotor plate 91 enters the flow channel 8 through the first flow gap 10, then flows through the flow channel 8 into the second flow gap 11, and enters the flow chamber 14 through the second flow gap 11. Under the special design of the end plate 74, the pressure of the shortest distance between the end plate 74 and the driving shaft 4 increases. Under the action of the pressure, the liquid enters the cooling flow channel and is discharged after passing through the central flow channel 151 and the Tesla flow channel 152 in the cooling flow channel.

[0063] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A self-cooling electromagnetic direct-drive high-speed centrifugal pump with separate adjustment of the inducer and impeller, characterized in that: The invention comprises a pump body and a driving assembly arranged on the pump body, wherein an end cover is arranged at one end of the driving assembly away from the pump body; the driving assembly comprises a driving shaft, an impeller is arranged on the outer periphery of the driving shaft near one end of the pump body, a bearing assembly is installed on the outer periphery of the driving shaft, a stator assembly connected to the pump body is arranged on the bearing assembly, a flow channel is arranged on the stator assembly, a pair of rotor assemblies are arranged on the outer periphery of the driving shaft, the pair of rotor assemblies are located on both sides of the bearing assembly, a first flow gap is arranged between the rotor assembly near the pump body and the stator assembly, a second flow gap is arranged between the rotor assembly near the end cover and the stator assembly, two ends of the flow channel are respectively communicated with the first flow gap and the second flow gap, a liquid cavity is arranged between the end surface of the stator assembly near one end of the pump body and the pump body, the liquid cavity is communicated with the first flow gap, a flow cavity is arranged in the stator assembly, the flow cavity is communicated with the second flow gap, and a cooling channel communicated with the flow cavity and the liquid cavity is arranged on the driving shaft.

2. According to claim 1, a self-cooling electromagnetic direct-drive high-speed centrifugal pump with separate adjustment of the inducer and the impeller, characterized in that: The bearing assembly includes a sleeve, a bearing liner, a rotor ring and a thrust plate. The inner periphery of the sleeve is connected to the outer periphery of the driving shaft, the outer periphery of the sleeve is connected to the bearing liner, rotor rings connected to the outer periphery of the sleeve are installed on both sides of the bearing liner, thrust plates fitted with both ends of the sleeve are installed on the outer periphery of the driving shaft, and the outer periphery of the bearing liner is connected to the stator assembly.

3. The self-cooling electromagnetic direct-drive high-speed centrifugal pump with separate adjustment of the inducer and impeller according to claim 1 is characterized by: The stator assembly includes a shell, an inner shaft seat, a pair of annular partitions, an end plate, a pair of stator cores and a coil. The shell is connected to the pump body, and an end plate is installed at one end of the shell away from the pump body. A pair of annular partitions are installed on the inner wall of the shell, and the inner shaft seat is installed between the pair of annular partitions. The inner shaft seat is connected to the bearing assembly, and a plurality of flow channels are opened on the inner circumferential wall of the inner shaft seat. A pair of stator cores are respectively installed on the inner shaft seat, and the coil is wound on the pair of stator cores. A pair of annular partitions are provided with a rib plate structure.

4. The self-cooling electromagnetic direct-drive high-speed centrifugal pump with separate adjustment of the inducer and impeller according to claim 3 is characterized by: A stator cavity is provided between the side walls of a pair of the annular partitions, the outer periphery of the inner shaft seat and the inner periphery of the shell, the stator core and the coil are located in the stator cavity, and a wire hole is provided on the side wall of the shell.

5. The self-cooling electromagnetic direct-drive high-speed centrifugal pump with separate adjustment of the inducer and impeller according to claim 3 is characterized by: The space between the annular partition plate and the end plate close to the end cover is a flow cavity; the rotor assembly close to the end cover is located in the flow cavity.

6. The self-cooling electromagnetic direct-drive high-speed centrifugal pump with separate adjustment of the inducer and impeller according to claim 5 is characterized by: The inner wall of the end plate is conical, the center point of the end plate is coaxial with the driving shaft, and the minimum distance between the end plate and the driving shaft is 2cm-10cm.

7. The self-cooling electromagnetic direct-drive high-speed centrifugal pump with separate adjustment of the inducer and impeller according to claim 1 is characterized by: The rotor assembly includes a rotor plate, a rotor core, a permanent magnet and a sealing plate. The inner circumference of the rotor plate is connected to the driving shaft. The rotor plate is provided with a rotor slot on a side close to the stator assembly. The rotor core is installed in the rotor slot. The permanent magnet is installed on the surface of the rotor core. The sealing plate is installed on the surface of the rotor plate and seals the rotor slot.

8. The self-cooling electromagnetic direct-drive high-speed centrifugal pump with separate adjustment of the inducer and impeller according to claim 7 is characterized by: A plurality of arc-shaped flow channels are arranged on a side of the rotor plate away from the rotor slot, and the plurality of arc-shaped flow channels are distributed in a ring array with the center point of the end surface of the rotor plate as a base point.

9. The self-cooling electromagnetic direct-drive high-speed centrifugal pump with separate adjustment of the inducer and impeller according to claim 1 is characterized by: The pump body is provided with a liquid inlet pipe connected to the liquid cavity, the side wall of the pump body is provided with a flow channel groove, the flow channel groove is located in the liquid cavity, and the pump body is installed with a liquid discharge pipe connected to the flow channel groove.

10. The self-cooling electromagnetic direct-drive high-speed centrifugal pump with separate adjustment of the inducer and impeller according to claim 1, characterized in that: The cooling channel includes two sections of central flow channels and a Tesla flow channel. The two sections of the central flow channels are respectively arranged at the two ends of the driving shaft. The two sections of the central flow channels are connected through the Tesla flow channel. The central flow channel close to one end of the pump body is connected to the liquid cavity, and the central flow channel close to one end of the end cover is connected to the flow cavity.

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