High-speed centrifugal pump driven by internal circulation self-cooling axial integrated motor

Abstract

The high-speed centrifugal pump driven by the internal circulation self-cooling axial integrated motor comprises a volute, an impeller and a driving unit, and the driving unit comprises a main shaft, a rotor assembly, a stator shell, a stator assembly, a gap channel and a bearing assembly; a first liquid cavity is further formed between the stator shell and the impeller, a second liquid cavity is formed in the end, away from the impeller, of the stator shell, and a bearing cooling flow channel is communicated with the first liquid cavity and the second liquid cavity; a pressure equalizing flow channel is further formed in the main shaft in the axial direction, and the pressure equalizing flow channel communicates with the second liquid cavity and extends to the impeller. According to the high-speed centrifugal pump, self-circulation liquid cooling can be conducted through conveyed liquid, the structure is simple and compact, an external cooling source is not needed, energy consumption is reduced, the temperature of the driving unit is greatly reduced, and therefore the driving unit is protected.

Description

Technical Field

[0001] The present invention relates to the technical field of centrifugal pumps, and particularly to a high-speed centrifugal pump with an inner circulation self-cooling axial integrated motor drive. Background Art

[0002] High-speed pumps are widely used in the aviation field, and more refined requirements need to be considered. While maintaining high efficiency, the volume must be greatly reduced to adapt to the compact space layout of aircraft. In addition, the heat problem caused by high-speed operation cannot be ignored.

[0003] To solve the heat dissipation problem, the driving motors equipped in existing centrifugal pumps need to be provided with heat dissipation structures on their motor casings to dissipate heat by increasing the heat dissipation area. This heat dissipation method has low efficiency. There is also a method of dissipating heat by installing a cooling fan inside the motor casing. Although it can improve the heat dissipation efficiency, it requires additional installation space for the cooling fan. There is also a method of dissipating heat through an external cooling medium, but this method requires an external cooling source. Summary of the Invention

[0004] The object of the present invention is to provide a high-speed centrifugal pump with an inner circulation self-cooling axial integrated motor drive for the problems existing in the prior art.

[0005] To achieve the above object, the technical solution adopted by the present invention is: A high-speed centrifugal pump with an inner circulation self-cooling axial integrated motor drive, including a volute. An inlet pipe is provided in the axial direction of the volute, a discharge pipe is provided on the outer periphery of the volute, an impeller is provided inside the volute, a driving unit is provided at one end of the volute away from the inlet pipe. The driving unit includes a main shaft, the main shaft is connected to the impeller, a sealed rotor assembly is provided on the main shaft, the main shaft is also connected to a stator housing through a bearing assembly, the stator housing is connected to the volute, a stator assembly arranged opposite to the rotor assembly is provided inside the stator housing, a clearance channel is provided between the rotor assembly and the stator assembly and the stator housing, and a bearing cooling flow channel communicating with the clearance channel is provided inside the bearing assembly; there is also a first liquid chamber between the stator housing and the impeller, a second liquid chamber is provided at one end of the stator housing away from the impeller, and the bearing cooling flow channel communicates with the first liquid chamber and the second liquid chamber respectively; a pressure equalizing flow channel is also provided axially inside the main shaft, and the pressure equalizing flow channel communicates with the second liquid chamber and extends to the impeller.

[0006] This high-speed centrifugal pump with an internal circulation self-cooling axial integrated motor drive adopts an integrated design of the motor and the pump body, which can reduce the volume of the entire centrifugal pump. When the centrifugal pump operates at high speed, a large amount of heat generated by the motor can be cooled by the self-circulating liquid of the conveyed liquid. It not only has a simple and compact structure, without the need for an external cooling source, but also saves energy consumption and greatly reduces the temperature of the drive unit, thereby protecting the drive unit.

[0007] Through the settings of the first liquid chamber, the gap channel, the bearing cooling channel, the second liquid chamber, and the pressure equalizing channel, this high-speed centrifugal pump can use a small part of the fluid pumped into the first liquid chamber as a cooling liquid to cool the entire drive unit during operation, without the need to additionally install motor cooling components, greatly simplifying the structure of the drive unit and greatly improving the cooling effect and operating stability of the drive unit. While realizing the conveyance of fluid by the liquid centrifugal pump, the components of the entire liquid centrifugal pump are cooled to ensure the stability, safety, and operating efficiency of the liquid centrifugal pump under high load.

[0008] Furthermore, an annular spiral channel is provided in the volute, the impeller is arranged at the cross-section where the annular spiral channel is located, and the discharge pipe is arranged outside the annular spiral channel and extends along the tangential direction of the annular spiral channel.

[0009] Furthermore, one end of the main shaft passes through the impeller and extends into the suction pipe, and an inducer is provided on the outer periphery of the main shaft located in the suction pipe; both the inducer and the impeller are made of stainless steel and are coated on the outer surface, and the impeller is also provided with a bionic fish scale texture structure.

[0010] Furthermore, the pressure equalizing channel includes a pressure equalizing hole provided on the axis of the main shaft, a Tesla valve hole is provided near the impeller at the pressure equalizing hole, and a number of radial holes are provided on the outer periphery of the main shaft inside the impeller, and the radial holes communicate with the pressure equalizing hole.

[0011] Furthermore, a rotor support seat is provided on the outer periphery of the main shaft, rotor installation grooves are respectively provided on the axial two sides of the rotor support seat, and the rotor assemblies are respectively installed in the rotor installation grooves, and bearing assemblies are respectively connected to the outer peripheries of the main shaft on both sides of the rotor support seat. Through the setting of the rotor support seat, the rotor assemblies can be installed at both axial ends respectively. In this way, not only can the occupation of axial space be reduced, the length of the drive main shaft be reduced, but also two groups of rotor assemblies, that is, more permanent magnets, can be installed at the same time. Combined with the setting of the stator assembly, greater torque and power can be provided.

[0012] Further, the rotor assembly includes a rotor core, permanent magnets, and a rotor watertight cover plate; a plurality of the permanent magnets are evenly distributed on the rotor core, the rotor core is installed in the rotor installation groove, and the rotor watertight cover plate is installed at the notch of the rotor installation groove.

[0013] Further, the stator housing includes a circumferential part of the housing and axial parts of the housing on both sides. Stator installation grooves are respectively provided on the inner sides of the axial parts of the housing, and the stator assembly is arranged in the stator installation grooves; the axial parts of the housing are sleeved and connected to the bearing assembly. The axial part of the housing close to the impeller side is hermetically connected to the end face of the volute and forms the first liquid chamber with the impeller. The axial part of the housing on the other side is connected with a housing rear cover. A second liquid chamber is arranged in the housing rear cover, and a control box is further arranged on the outer side of the housing rear cover.

[0014] Further, the stator assembly includes a stator core installed in the stator installation groove. A stator winding is provided on the stator core. A stator watertight cover plate is arranged at the notch of the stator installation groove. A heat conduction structure is provided on the surface of the stator watertight cover plate facing the stator installation groove. A wiring channel communicating with the stator installation groove is further arranged in the stator housing.

[0015] Further, the bearing assembly includes a bearing body, a bearing inner liner, and a bearing seat. The bearing body is arranged on the main shaft. The bearing inner liner is sleeved on the bearing body. The bearing seat is arranged outside the bearing inner liner. The bearing seat is connected to the stator housing. A plurality of bearing cooling channels are arranged in the bearing inner liner.

[0016] Further, a circular cooling shower head is further arranged in the second liquid chamber. The circular cooling shower head includes a shower outer curved surface and a shower inner curved surface connected as a whole. A shower inner cavity is arranged between the shower outer curved surface and the shower inner curved surface. A plurality of shower holes are arranged on the shower inner curved surface. A connecting ring is arranged in the middle of the shower inner curved surface. The connecting ring is connected to the bearing assembly close to the second liquid chamber. An axial channel extending towards the main shaft direction is arranged in the middle of the shower outer curved surface. The axial channel is connected to the pressure equalizing channel.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. For the high-speed centrifugal pump driven by the internal circulation self-cooling axial integrated motor, the integrated design of the motor and the pump body is adopted, which can reduce the volume of the whole centrifugal pump. When the centrifugal pump operates at high speed, a large amount of heat generated by the motor can be cooled by the self-circulating liquid of the conveyed liquid. It not only has a simple and compact structure, does not require an external cooling source, but also saves energy consumption and greatly reduces the temperature of the drive unit, thereby protecting the drive unit. 2. For the drive unit, the structures, installation positions and installation methods of the main shaft, the rotor assembly and the stator assembly are improved. They can not only drive the main shaft to rotate by magnetically driving the rotor assembly, but also use the air gap between the rotor assembly and the stator assembly as the clearance channel for the liquid to flow through, allowing the cooled liquid to pass through and cooling and dissipating heat from the rotor assembly and the stator assembly. 3. The stator housing itself is not only used as the outer housing of the drive unit, but also the mounting bracket of the stator assembly, without the need to additionally set up components for installing and fixing the stator assembly. 4. The bearing assembly not only plays a role in rotational support, but also improves its structure. The bearing cooling flow channel arranged inside it can not only cool and dissipate heat from the bearing itself, but also allow the cooling liquid to pass through so that the cooling liquid enters the clearance channel or the second liquid chamber. 5. Through the settings of the first liquid chamber, the clearance channel, the bearing cooling flow channel, the second liquid chamber and the pressure equalizing flow channel, the high-speed centrifugal pump can use a small part of the fluid pumped into the first liquid chamber as the cooling liquid to cool the entire drive unit during operation, greatly simplifying the structure of the drive unit and ensuring the stability, safety and operating efficiency of the centrifugal pump under high load. 6. Through the setting of the rotor support seat, the rotor assemblies can be installed at both axial ends respectively. This can not only reduce the occupation of axial space and shorten the length of the drive main shaft, but also install two groups of rotor assemblies at the same time, that is, more permanent magnets. Combined with the setting of the stator assembly, it can provide greater torque and power. 7. The circular cooling shower head can spray out more evenly flowing liquid by using its inner cavity and shower holes, which can further reduce the temperature of the stator assembly and the rotor assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 FIG. is a schematic diagram of the overall structure of a high-speed centrifugal pump driven by an internal circulation self-cooling axial integrated motor according to the present invention; Figure 2 FIG. is a schematic cross-sectional structure diagram of a high-speed centrifugal pump driven by an internal circulation self-cooling axial integrated motor according to the present invention; Figure 3 FIG. is a schematic cross-sectional structure diagram of the drive unit of the high-speed centrifugal pump according to the present invention; Figure 4 FIG. is a schematic structure diagram of the impeller of the high-speed centrifugal pump according to the present invention; Figure 5 Schematic diagram of the surface structure of the impeller of the present invention; Figure 6 Schematic cross-sectional structure diagram of the main shaft of the high-speed centrifugal pump of the present invention; Figure 7 Schematic structure diagram of the main shaft and the rotor support seat of the high-speed centrifugal pump of the present invention; Figure 8 Schematic cross-sectional structure diagram of the rotor support seat of the present invention; Figure 9 Schematic structure diagram of the rotor assembly of the present invention; Figure 10 Schematic structure diagram of the rotor watertight cover plate arranged on the rotor support seat of the present invention; Figure 11 Schematic structure diagram of the bearing assembly of the high-speed centrifugal pump of the present invention; Figure 12 Schematic cross-sectional structure diagram of the bearing assembly of the high-speed centrifugal pump of the present invention; Figure 13 Schematic structure diagram of the bearing lining of the bearing assembly of the present invention; Figure 14 Schematic structure diagram of the thrust disk seat of the bearing assembly of the present invention; Figure 15 Schematic structure diagram of the circular cooling shower head of the present invention; Figure 16 Schematic cross-sectional structure diagram of the circular cooling shower head of the present invention; Figure 17 Schematic diagram of the rotor support seat with another structure in Embodiment 2; Figure 18 Schematic connection and installation diagram of the stator seal cover plate with another structure in Embodiment 3; Figure 19 Schematic diagram of the back side of the stator seal cover plate with another structure in Embodiment 3; In the figure: 1, volute; 2, suction pipe; 3, discharge pipe; 4, drive unit; 401, main shaft; 402, rotor support seat; 4021, rotor mounting groove; 403, rotor assembly; 4031, rotor iron core; 4032, permanent magnet; 4033, rotor watertight cover plate; 404, bearing assembly; 4041, bearing housing; 4042, bearing inner lining; 4043, thrust plate seat; 4044, thrust plate rotor ring; 4045, shaft sleeve; 4046, relief groove; 405, stator housing; 4051, circumferential part of the housing; 4052, axial part of the housing; 4053, wiring channel; 406, stator assembly; 4061, stator iron core; 4062, stator watertight cover plate; 407, housing rear cover; 5, impeller; 501, bionic fish scale texture structure; 6, clearance channel; 7, bearing cooling flow channel; 8, first liquid chamber; 9, second liquid chamber; 10, pressure equalizing flow channel; 1001, pressure equalizing hole; 1002, Tesla valve hole; 1003, radial hole; 11, inducer; 12, control box; 13, circular cooling shower head; 1301, outer curved surface of the shower head; 1302, inner curved surface of the shower head; 1303, inner cavity of the shower head; 1304, shower head hole; 1305, connecting ring; 1306, axial channel; 14, spiral flow channel; 15, annular rib plate; 16, radial rib plate; 17, rib plate wiring hole. Detailed implementation mode

[0019] Next, the technical solutions of the present invention will be clearly and completely described in conjunction with 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. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0020] 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 cannot be understood as a limitation to the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. Embodiment 1

[0021] Such as Figures 1 to 16As shown in the figure, a high-speed centrifugal pump driven by an inner-circulation self-cooling axial integrated motor includes a volute 1. An inlet pipe 2 is provided in the axial direction of the volute 1, and a discharge pipe 3 is provided on the outer periphery of the volute 1. An impeller 5 is provided inside the volute 1. A driving unit 4 is provided at one end of the volute 1 away from the inlet pipe 2. The driving unit 4 includes a main shaft 401. The main shaft 401 is connected to the impeller 5. A sealed rotor assembly 403 is provided on the main shaft 401. The main shaft 401 is also connected to a stator housing 405 through a bearing assembly 404. The stator housing 405 is connected to the volute 1. A stator assembly 406 arranged opposite to the rotor assembly 403 is provided inside the stator housing 405. A clearance channel 6 is provided between the rotor assembly 403, the stator assembly 406 and the stator housing 405. A bearing cooling flow channel 7 communicating with the clearance channel 6 is provided inside the bearing assembly 404. A first liquid chamber 8 is further provided between the stator housing 405 and the impeller 5. A second liquid chamber 9 is provided at one end of the stator housing 405 away from the impeller 5. The bearing cooling flow channel 7 communicates with the first liquid chamber 8 and the second liquid chamber 9 respectively. A pressure equalizing flow channel 10 is also provided axially inside the main shaft 401. The pressure equalizing flow channel 10 communicates with the second liquid chamber 9 and extends to the impeller 5.

[0022] This high-speed centrifugal pump driven by an inner-circulation self-cooling axial integrated motor adopts an integrated design of the motor and the pump body, which can reduce the volume of the entire centrifugal pump. When the centrifugal pump operates at high speed, a large amount of heat generated by the motor can be cooled by the self-circulation of the conveyed liquid. It not only has a simple and compact structure, does not require an external cooling source, but also saves energy consumption and greatly reduces the temperature of the driving unit, that is, the motor, thus protecting the driving unit.

[0023] The volute 1 has a cavity that can accommodate the impeller 5. After the impeller is installed, the space on the right side of the impeller is the first liquid chamber 8. The inlet pipe 2 provided in its axial direction is used to introduce fluid (liquid). Under the action of the impeller 5, the fluid is accelerated and discharged through the discharge pipe 3 arranged in its radial direction. At the same time, a part of the liquid will enter the first liquid chamber 8 for subsequent cooling and heat dissipation.

[0024] For the drive unit 4, the structures, mounting positions, and mounting methods of the main shaft 401, the rotor assembly 403, and the stator assembly 406 are improved. Not only can they drive the rotation of the main shaft by magnetically driving the rotor assembly, but they can also use the air gap between the rotor assembly and the stator assembly as the clearance channel 6 through which the liquid flows, allowing the cooled liquid to pass through and cooling and dissipating heat from the rotor assembly 403 and the stator assembly 406. The stator housing 405 can be directly mounted on the main shaft 401 through the bearing assembly 404. The stator housing 405 itself not only serves as the outer housing (casing) of the drive unit but also as the mounting frame for the stator assembly 406, eliminating the need for additional components to mount and fix the stator assembly. The bearing assembly 404 has been improved in its structure while providing rotational support. The bearing cooling flow channel 7 provided inside it can not only cool and dissipate heat from the bearing itself but also allow the cooling liquid to pass through so that the cooling liquid can enter the clearance channel 6 or the second liquid chamber 9. The structures of the two bearing assemblies are basically the same, except that they are arranged on the left and right sides of the main shaft.

[0025] The second liquid chamber 9 is provided behind the stator housing 405, which can receive and accommodate the flowing cooling liquid so that the cooling liquid can enter the pressure equalizing flow channel 10 inside the main shaft from the rear end of the main shaft, cool and dissipate heat from the main shaft 401, and then discharge the cooling liquid to the impeller 5 again. The second liquid chamber 9 can also accommodate other components, such as a shower head added later, to improve the cooling and circulation effects.

[0026] Through the settings of the first liquid chamber 8, the clearance channel 6, the bearing cooling flow channel 7, the second liquid chamber 9, and the pressure equalizing flow channel 10, this high-speed centrifugal pump can use a small part of the fluid pumped into the first liquid chamber as the cooling liquid to cool the entire drive unit during operation, eliminating the need for additional motor cooling components, greatly simplifying the structure of the drive unit, and greatly improving the cooling effect and operating stability of the drive unit.

[0027] Specifically, in combination with Figure 3As shown, when the impeller rotates at high speed, a part of the fluid will flow into the first liquid chamber 8. This liquid then sequentially passes through the bearing cooling channels 7 on the left side, the gap channel 6, and the bearing cooling channels 7 on the right side and enters the second liquid chamber 9. During this process, the liquid will cool the bearing assembly 404, stator assembly 406, rotor assembly 403, etc. that it passes through in real time. The fluid in the second liquid chamber 9 further enters the pressure equalizing channel 10 to cool the main shaft 401, and the liquid is discharged back into the impeller 5 again to be mixed with the fluid inhaled by the impeller. Through this continuous cyclic operation, while the liquid centrifugal pump transports the fluid, the components of the entire liquid centrifugal pump are cooled, ensuring the stability, safety, and operating efficiency of the liquid centrifugal pump under high load.

[0028] Furthermore, an annular volute is provided in the volute 1. The impeller 5 is arranged at the cross-section where the annular volute is located. The discharge pipe 3 is arranged outside the annular volute and extends along the tangential direction of the annular volute.

[0029] The impeller 5 has multiple blades inside. The blades are evenly distributed along the circumferential direction and push the fluid to flow along the volute channel when rotating, and can discharge the accelerated fluid from the discharge port at high speed. The outer periphery of the impeller does not directly contact the volute or the annular volute, so there will be some gaps between them, which enables some liquid to enter the first liquid chamber.

[0030] The suction pipe 2 is provided with a suction flange, and the end of the discharge pipe 3 is provided with a discharge flange. The installation of the suction flange and the discharge flange can form a sealing barrier to prevent fluid leakage and can adapt to different pressure requirements to ensure the stable operation of the pump system.

[0031] The structure of the volute 1, through optimized layout and dimensions, can significantly reduce the volume of the volute itself, thereby achieving a compact design while also improving the space utilization efficiency, and making the subsequent installation process of the drive unit and the circular cooling shower more convenient and efficient.

[0032] Furthermore, one end of the main shaft 401 passes through the impeller 5 and extends into the suction pipe 2. An inducer 11 is provided on the outer periphery of the main shaft 401 in the suction pipe 2. The setting of the inducer 11 is beneficial to inhaling the fluid. Both the inducer 11 and the impeller 5 are made of HDR duplex stainless steel material and are coated on the outer surface to prevent cavitation and liquid corrosion. The impeller 5 is also provided with a bionic fish scale texture structure 501, which improves the wear resistance, thereby significantly extending the service life of the impeller. At the same time, it also reduces the bubbles generated when stirring the fluid, reduces the working noise, enhances the fluid suction, improves the working efficiency, and effectively avoids the waste of energy.

[0033] Further, combined with Figure 6 As shown, the pressure equalizing channel 10 includes a pressure equalizing hole 1001 arranged on the axis of the main shaft 401, and the pressure equalizing hole 1001 is provided with a Tesla valve hole 1002 near the impeller 5. The main shaft 401 is provided with a plurality of radial holes 1003 on the outer periphery located inside the impeller 5, and the radial holes 1003 are connected to the pressure equalizing hole 1001.

[0034] The liquid in the second liquid chamber 9 can be returned to the impeller 5 through the pressure equalizing hole 1001, thereby reducing the axial force in the second liquid chamber 9. The pressure equalizing hole 1001 adopts the structure of a Tesla valve hole 1002 in the part close to the impeller, and is provided with a radial hole 1003 surrounding the main axis when reaching the impeller. The liquid in the pressure equalizing hole can flow to the impeller, while preventing the liquid at the impeller from flowing back into the pressure equalizing hole. At the same time, the Tesla valve hole can also improve the heat exchange effect.

[0035] Further, such as Figure 7 and Figure 8 As shown, a rotor support seat 402 is provided on the outer periphery of the main shaft 401, and rotor mounting grooves 4021 are respectively provided on the axial sides of the rotor support seat 402, and the rotor assemblies 403 are respectively installed in the rotor mounting grooves 4021, and the main shaft 401 is respectively connected to the bearing assemblies 404 on the outer peripheries of both sides of the rotor support seat 402.

[0036] By setting the rotor support seat 402, the rotor assembly 403 can be installed at both ends of the axial direction. This not only reduces the occupation of the axial space and reduces the length of the driving shaft, but also allows two sets of rotor assemblies to be installed at the same time, that is, more permanent magnets. Combined with the setting of the stator assembly, it can provide greater torque and power.

[0037] Further, combined with Figure 9 and Figure 10 As shown, the rotor assembly 403 includes a rotor core 4031, permanent magnets 4032 and a rotor watertight cover plate 4033; a number of the permanent magnets 4032 are evenly distributed on the rotor core 4031, the rotor core 4031 is installed in the rotor mounting groove 4021, and the rotor watertight cover plate 4033 is installed at the notch of the rotor mounting groove 4021.

[0038] In this embodiment, the rotor assembly is located inside the stator housing. The rotor core is made of MP35 alloy material, which has the advantages of high hardness, non-magnetism, good ductility, and excellent cavitation resistance. The rotor core is fixedly connected to the rotor support seat to ensure the structural stability of the electronic rotor assembly. The permanent magnet is fixedly connected to the rotor core. The rotor support seat is fixedly sleeved on the main shaft. The rotor watertight cover plates are arranged on both sides of the rotor core, and the rotor watertight cover plates play a protective role to prevent liquid from entering the rotor core.

[0039] Further, as Figure 2 and 3 shown, the stator housing 405 includes a circumferential part 4051 of the housing and axial parts 4052 on both sides. Stator mounting grooves are respectively provided on the inner sides of the axial parts 4052 of the housing, and the stator assembly 406 is arranged in the stator mounting grooves; the axial parts 4052 of the housing are sleeved and connected to the bearing seats 4041 of the bearing assembly 404 and are fixedly connected by bolts. The axial part 4052 of the housing close to the impeller 5 side is provided with a stepped structure and is hermetically connected to the end face of the volute 1, and a first liquid chamber 8 is formed between it and the impeller. The axial part of the housing on the other side is connected with a housing rear cover 407. A second liquid chamber 9 is provided in the housing rear cover 407, and a control box 12 is further provided on the outer side of the housing rear cover 407.

[0040] The axial part 4051 of the housing forms front and rear end plates in the axial direction, and the stator mounting grooves are opened on its inner wall so as to accommodate and install the stator assembly 406 on the inner end face and be arranged opposite to the aforementioned rotor assembly 403. This installation structure is convenient and simple, and there is no need to add a stator bracket, which simplifies the internal structure of the motor.

[0041] Further, the stator assembly 406 includes a stator core 4061 installed in the stator mounting groove. A stator winding is provided on the stator core 4061. A stator watertight cover plate 4062 is provided at the notch of the stator mounting groove. A wiring channel 4053 communicating with the stator mounting groove is further provided in the stator housing 405.

[0042] In this embodiment, the stator housing 405 is detachably and fixedly connected to the volute 1. A wire routing channel 4053 is formed in the upper part of the stator housing (the circumferential part 4051 of the housing) for connecting the stator winding and the control box. The stator housing 405 fixes the stator assembly together and provides structural support, while protecting the stator core from external damage. The stator core 4061 is detachably and fixedly connected to both sides of the stator housing 405. The stator waterproof cover plate 4062 is arranged on the side of the two stator cores 4061 away from the stator housing. The stator waterproof cover plate 4062 ensures that the inside of the stator assembly is not invaded by pollutants such as moisture and dust. The stator winding is arranged in the stator housing and wound around the stator core. The stator winding is electrically connected to the power supply. The gap channel 6 is the channel between the stator waterproof cover plate 4062 and the rotor waterproof cover plate 4033, and the channel between the outer circumference of the rotor support seat 402 and the inner circumference of the circumferential part 4051 of the housing.

[0043] Further, as shown in Figures 11 - 13 The bearing assembly 404 includes a bearing body, a bearing inner liner 4042 and a bearing seat 4041. The bearing body is arranged on the main shaft 401. The bearing inner liner 4042 is sleeved on the bearing body. The bearing seat 4041 is arranged outside the bearing inner liner 4042. The bearing seat 4041 is connected to the stator housing 405. A plurality of bearing cooling channels 7 are arranged in the bearing inner liner 4042.

[0044] In this embodiment, the bearing seat 4041 is fixedly connected to the stator housing 405. The bearing inner liner 4042 is provided with 8 annularly distributed bearing cooling channels 7. Liquid can flow into the gap channel 6 through the bearing cooling channels 7 to take away heat and achieve the purpose of cooling. It can also allow the liquid in the gap channel 6 to flow into the rear second liquid chamber 9 or the subsequent circular cooling shower head.

[0045] The bearing body may include a thrust disk seat 4043, a thrust disk rotor ring 4044 and a shaft sleeve 4045. Both the thrust disk seat 4043 and the shaft sleeve 4045 are arranged on the main shaft 401. One end of the shaft sleeve 4045 abuts against the thrust disk seat 4043. The bearing inner liner 4042 and the thrust disk rotor ring 4044 are sleeved on the shaft sleeve 4045. The thrust disk rotor ring 4044 is arranged between the bearing inner liner 4042 and the thrust disk seat 4043. The thrust disk seat 4043 has a space for accommodating the thrust disk rotor ring. Its outer circumference is non-circular and is provided with an arc-shaped relief groove 4046 through which liquid can flow.

[0046] A bearing is also provided between the front end of the impeller 5 and the volute 1 at the suction pipe 2, which can ensure that the main shaft maintains a stable position during high-speed operation, and the main shaft can rotate smoothly, thereby driving the main shaft and the impeller to rotate. The bearing seat can be made of high-strength alloy steel, and the bearing lining can be made of tin-based bearing alloy material, which can better adapt to heavy-load and high-speed usage places.

[0047] Further, in combination with Figure 15 and Figure 16 As shown, a circular cooling shower head 13 is further provided in the second liquid chamber 9. The circular cooling shower head 13 includes a shower outer curved surface 1301 and a shower inner curved surface 1302 connected as a whole. A shower inner cavity 1303 is provided between the shower outer curved surface 1301 and the shower inner curved surface 1302. A plurality of shower holes 1304 are provided on the shower inner curved surface 1302. A connecting ring 1305 is provided in the middle of the shower inner curved surface 1302. The connecting ring 1305 is connected to the bearing assembly 404 close to the second liquid chamber 9. An axial channel 1306 extending in the direction of the main shaft 401 is provided in the middle of the shower outer curved surface 1301. The axial channel 1306 is connected to the pressure equalizing flow channel 10.

[0048] In this embodiment, the circular cooling shower head 13 is provided with shower holes 1304 whose apertures are arranged to gradually decrease from the outer periphery to the inner periphery. The pressure in the shower inner cavity 1303 gradually increases from bottom to top, and the sprayed liquid flow is more uniform, which can further reduce the temperatures of the stator assembly 406 and the rotor assembly 403. After the liquid sprayed from the shower holes 1304 enters the second liquid chamber 9, it flows to the outside of the shower outer curved surface 1301 and flows into the pressure equalizing flow channel 10 through the axial channel 1306.

[0049] The axial channel 1306 is provided with threads and can be threadedly connected to the pressure equalizing hole 1001 of the main shaft to fix the circular cooling shower head 13. The connecting ring 1305 abuts against the end face of the bearing seat or the bearing lining. The housing rear cover is detachably fixed to the stator housing, which is convenient for subsequent maintenance and detection. Embodiment 2

[0050] The difference between this embodiment and Embodiment 1 lies in the different settings of the rotor support seat.

[0051] Specifically, in combination with Figure 7 and Figure 17As shown, a corresponding flow channel is provided in each of the rotor support base 402 and the main shaft 401, forming a number of spiral flow channels 14 extending from the middle to the periphery. Through these spiral flow channels 14, the cooling liquid (a part of the cooling liquid) entering the main shaft 401 can be thrown into the motor housing again, that is, the area between the outer periphery of the rotor support base 402 and the inner periphery of the stator housing 405, so as to further dissipate heat from the rotor support base and the rotor assembly therein. The rotor support base 402 and the main shaft 401 can be of a split structure and then assembled and fixed together, or can be of an integral structure. Embodiment 3

[0052] On the basis of Embodiment 1, this embodiment provides a stator watertight cover plate with another structure. A heat transfer structure is further provided on the inner side of the stator watertight cover plate 4062.

[0053] Specifically, as Figures 18 to 19 shown, the heat conduction structure includes a number of annular ribs 15 and radial ribs 16 provided on the side (back side) of the stator watertight cover plate 4062 facing the stator core. A number of the annular ribs 15 are respectively arranged near the inner and outer circles of the stator watertight cover plate 4062. The number of the annular ribs 15 is concentrically arranged. After assembly, the annular ribs 15 extend into the stator installation groove, being located at the outer and inner peripheries of the stator core 4061. A rib wire hole 17 is further provided on the upper annular rib 15. The rib wire hole 17 corresponds to the wire channel 4053 and can allow the stator winding (cable) to pass through. The radial ribs 16 are short ribs, densely arranged at intervals into several groups. The several groups of radial ribs 16 are arranged along the radial direction of the stator watertight cover plate 4062 and are located between the annular ribs at the inner and outer circles. The radial ribs 16 correspond to the stator core 4061. In some embodiments, some heat exchange grooves can be provided on the surface of the stator core 4061, and the radial ribs 16 can be inserted into the heat exchange grooves.

[0054] Through the arrangement of the annular ribs 15 and the radial ribs 16, not only can the strength and stability of the stator watertight cover plate 4062 be enhanced, but also a strong heat exchange and heat conduction effect can be achieved, which is beneficial to the heat dissipation of the stator installation groove, especially for the heat dissipation of the stator core and the stator winding. These annular ribs can effectively take away the heat generated on the stator winding.

[0055] 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. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An internal circulation self-cooling axial integrated motor driven high-speed centrifugal pump, comprising a volute, a suction pipe is provided in the axial direction of the volute, and a discharge pipe is provided on the outer periphery of the volute, characterized in that: An impeller is provided inside the volute, and a driving unit is provided at one end of the volute away from the suction pipe, the driving unit includes a main shaft, the main shaft is connected to the impeller, a sealed rotor assembly is provided on the main shaft, and a stator housing is also connected to the main shaft through a bearing assembly, the stator housing is connected to the volute, a stator assembly arranged opposite to the rotor assembly is provided in the stator housing, a gap channel is provided between the rotor assembly, the stator assembly and the stator housing, and a bearing cooling channel connected to the gap channel is provided in the bearing assembly; a first liquid chamber is also provided between the stator housing and the impeller, a second liquid chamber is provided at one end of the stator housing away from the impeller, and the bearing cooling channel is respectively connected to the first liquid chamber and the second liquid chamber; a pressure equalizing channel is also provided axially in the main shaft, and the pressure equalizing channel is connected to the second liquid chamber and extends to the impeller.

2. The internal circulation self-cooling axial integrated motor driven high-speed centrifugal pump according to claim 1, characterized in that: An annular volute is provided in the volute casing, the impeller is arranged at the cross section where the annular volute is located, and the discharge pipe is arranged outside the annular volute and extends along the tangential direction of the annular volute.

3. The internal circulation self-cooling axial integrated motor driven high-speed centrifugal pump according to claim 1, characterized in that: One end of the main shaft passes through the impeller and extends into the suction pipe. The main shaft is located on the outer periphery of the suction pipe and is provided with an inducer. Both the inducer and the impeller are made of stainless steel and are plastic-coated on the outer surface. The impeller is also provided with a bionic fish scale texture structure.

4. The internal circulation self-cooling axial integrated motor driven high-speed centrifugal pump according to claim 1, characterized in that: The pressure equalizing channel includes a pressure equalizing hole arranged on the axis of the main shaft, and a Tesla valve hole is provided at the pressure equalizing hole near the impeller. The main shaft is provided with a plurality of radial holes on the outer periphery inside the impeller, and the radial holes are connected to the pressure equalizing hole.

5. The internal circulation self-cooling axial integrated motor driven high-speed centrifugal pump according to claim 1, characterized in that: A rotor support seat is provided on the outer periphery of the main shaft, and rotor mounting grooves are respectively provided on the axial sides of the rotor support seat, and the rotor assemblies are respectively installed in the rotor mounting grooves. The main shaft is respectively connected to the bearing assemblies on the outer peripheries of the two sides of the rotor support seat.

6. The internal circulation self-cooling axial integrated motor driven high-speed centrifugal pump according to claim 5, characterized in that: The rotor assembly includes a rotor core, permanent magnets and a rotor watertight cover plate; a number of the permanent magnets are evenly distributed on the rotor core, the rotor core is installed in the rotor mounting groove, and the rotor watertight cover plate is installed at the notch of the rotor mounting groove.

7. The internal circulation self-cooling axial integrated motor driven high-speed centrifugal pump according to claim 1, characterized in that: The stator housing includes a circumferential portion of the housing and axial portions of the housing on both sides, the inner sides of the axial portions of the housing are respectively provided with stator mounting grooves, and the stator assembly is arranged in the stator mounting grooves; the axial portions of the housing are sleeved on and connected to the bearing assembly, the axial portion of the housing close to the impeller side is sealed and connected to the end face of the volute and forms the first liquid chamber with the impeller, and the axial portion of the housing on the other side is connected to a housing rear cover, the housing rear cover is provided with the second liquid chamber, and a control box is also provided on the outer side of the housing rear cover.

8. The internal circulation self-cooling axial integrated motor driven high-speed centrifugal pump according to claim 7, characterized in that: The stator assembly includes a stator core installed in the stator mounting groove, a stator winding is provided on the stator core, a stator watertight cover plate is provided at the groove opening of the stator mounting groove, a heat conducting structure is provided on the side of the stator watertight cover plate facing the stator mounting groove, and a wiring channel connected to the stator mounting groove is also provided in the stator housing.

9. The internal circulation self-cooling axial integrated motor driven high-speed centrifugal pump according to claim 1, characterized in that: The bearing assembly includes a bearing body, a bearing liner and a bearing seat. The bearing body is arranged on the main shaft, the bearing liner is sleeved on the bearing body, the bearing seat is arranged outside the bearing liner, the bearing seat is connected to the stator housing, and a plurality of bearing cooling channels are arranged in the bearing liner.

10. The internal circulation self-cooling axial integrated motor driven high-speed centrifugal pump according to claim 1, characterized in that: A circular cooling shower is also provided in the second liquid chamber, and the circular cooling shower includes an outer shower surface and an inner shower surface connected as one body, a shower inner cavity is provided between the outer shower surface and the inner shower surface, a plurality of shower holes are provided on the inner shower surface, a connecting ring is provided in the middle of the inner shower surface, the connecting ring is connected to the bearing assembly close to the second liquid chamber, an axial channel extending toward the main axis is provided in the middle of the outer shower surface, and the axial channel is connected to the pressure equalizing channel.

Images