Internal circulation self-cooling integrated axial magnetic flux direct-driven centrifugal pump

Abstract

The invention discloses an internal circulation self-cooling integrated axial magnetic flux direct-drive centrifugal pump which comprises a fluid rotating module, an electromagnetic direct-drive module and a drive control module. The electromagnetic direct-drive module and the drive control module are arranged on one side of the fluid rotating module. The fluid rotating module comprises a pump body and an impeller; the electromagnetic direct-drive module comprises a motor shell, a driving main shaft, a rotor assembly, a stator assembly and a bearing assembly; the bearing assembly is provided with a first fluid channel and a second fluid channel, and a main shaft cooling flow channel communicated with the rear cavity and the impeller is further arranged in the driving main shaft in the axial direction. According to the core pump, the heat dissipation mode of the driving main shaft, the motor shell, the rotor assembly and the stator assembly is improved, so that the driving part of the whole centrifugal pump is compact in structure and small in size, the excellent self-heat-dissipation capacity is achieved, fault damage caused by high temperature is avoided, stability and safety under high loads are guaranteed, and the service life of the centrifugal pump is prolonged. The industrial production requirements are met.

Description

Technical Field

[0001] The present invention relates to the technical field of centrifugal pumps, and particularly to an integrated axial flux direct drive centrifugal pump with internal circulation self-cooling. Background Art

[0002] When an axial flux motor is used for driving in a pump unit, a larger head and higher efficiency can be obtained. However, the heat generation problem of the axial flux motor cannot be ignored, especially for multi-disc disc motors. Therefore, while obtaining higher efficiency, how to minimize the losses caused by heat generation is an important problem currently faced.

[0003] A Chinese patent application with the publication number CN118572948A was published on August 30, 2024, which discloses a comprehensive heat dissipation system, providing a heat dissipation system that cools the stator unit through a cooling channel and strengthens the cooling effect by circulating the air inside the motor housing through a circulating air duct. However, this system has the problems of low air-cooling efficiency and inapplicability in the multi-disc case, and it has a large size after being paired with the pump unit and also requires an external cooling source. Summary of the Invention

[0004] The purpose of the present invention is to provide an integrated axial flux direct drive centrifugal pump with internal circulation self-cooling for the problems existing in the prior art.

[0005] To achieve the above purpose, the technical solution adopted by the present invention is: An integrated axial flux direct drive centrifugal pump with internal circulation self-cooling, comprising a fluid rotation module, and an electromagnetic direct drive module and a drive control module arranged on one side of the fluid rotation module; the fluid rotation module includes a pump body, and an impeller arranged at the fluid inlet and outlet of the pump body; the electromagnetic direct drive module includes a motor housing connected to the pump body, a drive main shaft is arranged inside the motor housing, the drive main shaft is connected to the impeller, a sealed rotor assembly is arranged on the drive main shaft, a stator assembly arranged opposite to the rotor assembly is sealed and installed inside the motor housing, a gap channel is arranged between the stator assembly and the rotor assembly, and a bearing assembly connected to the motor housing is also arranged on the drive main shaft; a rear chamber is arranged at the rear end of the motor housing, a first fluid channel connecting the fluid inlet and outlet to the gap channel is arranged on the bearing assembly close to the impeller side, a second fluid channel connecting the gap channel to the rear chamber is arranged on the bearing assembly close to the rear chamber side, and a main shaft cooling flow channel connecting the rear chamber to the impeller is also arranged axially inside the drive main shaft.

[0006] This integrated axial flux direct-drive centrifugal pump with internal circulation self-cooling improves the heat dissipation methods of the drive main shaft, the motor housing, the rotor assembly, and the stator assembly, making the drive part of the entire centrifugal pump not only structurally compact and small in size, but also having excellent self-cooling ability, avoiding failure damage caused by high temperature, ensuring stability and safety under high loads, and meeting the requirements of industrial production.

[0007] Through the settings of the fluid port, the gap channel, the first fluid channel, the second fluid channel, the rear chamber, and the main shaft cooling channel, this centrifugal pump can use a small part of the pumped fluid as a cooling fluid to cool the entire electromagnetic direct-drive module during operation, without the need to additionally install motor cooling components, greatly simplifying the structure of the electromagnetic direct-drive module and greatly improving the cooling effect of the electromagnetic direct-drive module.

[0008] Further, a flow channel groove is provided in the fluid port, and the outer periphery of the impeller is arranged at the flow channel groove; a discharge port is provided on the outer periphery of the flow channel groove, and a suction port communicating with the fluid port is provided in the pump body corresponding to the axial direction of the impeller.

[0009] Further, a partition plate is provided on the outer periphery of the drive main shaft, rotor installation grooves are respectively provided on both sides of the partition plate, the rotor assemblies are respectively installed in the rotor installation grooves, and bearing assemblies are respectively connected to the outer peripheries of the drive main shaft on both sides of the partition plate; the main shaft cooling channel includes a central channel provided on the axis of the drive main shaft and Tesla channels communicating with the central channel.

[0010] Through the setting of the partition plate, the rotor assemblies can be installed at both axial ends respectively, which can not only reduce the occupation of axial space and reduce the length of the drive main shaft, but also cooperate with the stator assembly to provide greater torque and power.

[0011] Further, a number of spiral channels are provided in the partition plate and the drive main shaft, and each spiral channel extends from the outer periphery of the partition plate to the central channel to further dissipate heat from the partition plate and the rotor assembly therein.

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

[0013] Furthermore, annular housing end plates are provided at both ends of the motor housing. Inner stator mounting grooves are respectively arranged on the inner sides of the housing end plates, and the stator assemblies are arranged in the stator mounting grooves. The inner circumferences of the housing end plates are sleeved and connected to the bearing assemblies. The housing end plate close to the impeller side is hermetically connected to the end face of the pump body, and the other housing end plate is connected to a motor rear cover, and a rear chamber is arranged in the motor rear cover.

[0014] Furthermore, the stator assembly includes a stator core installed in the stator mounting groove. A stator winding is arranged on the stator core. A stator sealing thin plate is arranged at the notch of the stator mounting groove. A wiring channel communicating with the stator mounting groove is also arranged in the motor housing. A heat transfer structure is also arranged on the inner side of the stator sealing cover plate.

[0015] Furthermore, the bearing assembly includes a thrust disk seat, a thrust disk rotor ring, a shaft sleeve, a bearing inner liner and a bearing housing. The thrust disk seat and the shaft sleeve are both arranged on the driving main shaft. One end of the shaft sleeve abuts against the thrust disk seat. The bearing inner liner and the thrust disk rotor ring are sleeved on the shaft sleeve. The thrust disk rotor ring is arranged between the bearing inner liner and the thrust disk seat. The bearing housing is arranged outside the bearing inner liner, and the bearing housing is connected to the motor housing. Multiple first fluid channels or second fluid channels are arranged in the bearing inner liner.

[0016] Furthermore, a cooling shower is also arranged in the rear chamber. The cooling shower includes an outer curved surface and an inner curved surface connected as a whole. A shower inner cavity is arranged between the outer curved surface and the inner curved surface. A plurality of holes are arranged on the inner curved surface. A connecting ring is arranged in the middle of the inner curved surface. The connecting ring is connected to the bearing assembly far from the impeller. An axial channel extending towards the main shaft cooling flow channel is arranged in the middle of the outer curved surface, and the axial channel is connected to the main shaft cooling flow channel.

[0017] Furthermore, the drive control module includes a driver housing installed on the outer side of the pump body. A driver is arranged in the driver housing. The driver is connected to the electromagnetic direct drive module through a wiring channel on the driver housing. Serpentine flow channels are respectively arranged on the side wall and the peripheral wall shared by the driver housing and the pump body, and the serpentine flow channels are communicated with the inner cavity of the pump body.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. The integrated axial flux direct drive centrifugal pump with internal circulation self-cooling improves the heat dissipation methods of the drive main shaft, the motor housing, the rotor assembly and the stator assembly, making the drive part of the entire centrifugal pump not only structurally compact and small in size, but also having excellent self-heat dissipation ability, avoiding failure damage caused by high temperature, ensuring stability and safety under high load, and meeting the requirements of industrial production; 2. Through the settings of the fluid inlet, the gap channel, the first fluid channel, the second fluid channel, the rear chamber and the main shaft cooling channel, the centrifugal pump can use a small part of the pumped fluid as the cooling fluid to cool the entire electromagnetic direct drive module during operation, without the need to additionally install motor cooling components, greatly simplifying the structure of the electromagnetic direct drive module and greatly improving the cooling effect of the electromagnetic direct drive module; 3. Through the setting of the partition plate, the rotor assembly 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 sets of rotor assemblies at the same time. With the setting of the stator assembly, it can provide greater torque and power; the spiral channel inside it can throw the cooling fluid entering the drive main shaft into the motor housing again to further dissipate heat from the partition plate and the rotor assembly inside it; 4. The bearing assembly can not only connect and install the drive main shaft and the motor housing well, but also connect the chambers in the front and rear directions of the motor housing by setting the first fluid channel or the second fluid channel on the bearing liner, allowing the cooling fluid at the fluid inlet to enter the gap channel, and then leading the cooling fluid in the gap channel to the rear chamber; 5. The cooling shower uses the holes on its inner cavity and inner surface to flow out the same flow rate of cooling liquid, so as to cool the motor housing and the stator assembly evenly. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 FIG. is a schematic diagram of the overall structure of an integrated axial flux direct drive centrifugal pump with internal circulation self-cooling according to the present invention; Figure 2 FIG. is a schematic side view of the pump body of the centrifugal pump according to the present invention; Figure 3 is Figure 2 the schematic cross-sectional structure diagram of A-A in; Figure 4 FIG. is a schematic cross-sectional structure diagram of the whole centrifugal pump according to the present invention; Figure 5 FIG. is a schematic three-dimensional cross-sectional structure diagram of the whole centrifugal pump according to the present invention; Figure 6 FIG. is a partial enlarged structure diagram of the cooling channel in the motor housing according to the present invention; Figure 7 FIG. is a three-dimensional structure diagram of the drive main shaft according to the present invention; Figure 8 The vertical sectional structure diagram of the driving main shaft of the present invention; Figure 9 The sectional structure diagram of the driving main shaft of the present invention at the partition plate; Figure 10 The sectional structure diagram of the rotor assembly of the present invention; Figure 11 The structure diagram of the rotor assembly of the present invention; Figure 12 The sectional structure diagram of the stator assembly of the present invention; Figure 13 The three-dimensional structure diagram of the bearing assembly of the present invention; Figure 14 The sectional structure diagram of the bearing assembly of the present invention; Figure 15 The three-dimensional structure diagram of the bearing inner lining in the bearing assembly of the present invention; Figure 16 The three-dimensional structure diagram of the cooling shower part of the present invention; Figure 17 The sectional structure diagram of the cooling shower part of the present invention; Figure 18 is Figure 17 The enlarged structure diagram at position C in Figure 19 is Figure 2 The sectional structure diagram of B-B in Figure 20 The connection and installation diagram of the stator sealing cover plate with another structure in Embodiment 2; Figure 21 The front view of the stator sealing cover plate with another structure in Embodiment 2; Figure 22 The back view of the stator sealing cover plate with another structure in Embodiment 2; In the figure: 1. Fluid rotation module; 101. Pump body; 102. Fluid port; 103. Impeller; 104. Suction port; 105. Discharge port; 106. Flow channel groove; 2. Electromagnetic direct drive module; 201. Drive main shaft; 2011. Partition plate; 2012. Rotor mounting groove; 2013. Spiral flow channel; 202. Rotor assembly; 2021. Rotor iron core; 2022. Permanent magnet; 2023. Rotor sealing thin plate; 203. Stator assembly; 2031. Stator iron core; 2032. Stator sealing thin plate; 204. Motor housing; 2041. Housing end plate; 2042. Wiring channel; 205. Bearing assembly; 2051. Thrust disk seat; 2052. Thrust disk rotor ring; 2053. Bush; 2054. Bearing lining; 2055. Bearing housing; 2056. First fluid channel; 2057. Second fluid channel; 2058. Connection groove; 206. Motor rear cover; 207. Rear chamber; 208. Cooling shower head; 2081. Outer surface; 2082. Inner surface; 2083. Hole; 2084. Connection ring; 2085. Axial channel; 2086. Shower head inner cavity; 209. Main shaft cooling flow channel; 2091. Central flow channel; 2092. Tesla channel; 3. Drive control module; 301. Driver housing; 302. Driver; 303. Serpentine flow channel; 4. Clearance channel; 5. Annular rib plate; 6. Radial rib plate; 7. Rib plate wiring hole. Detailed implementation mode

[0020] The technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of 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.

[0021] 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 of 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

[0022] As Figures 1 to 19As shown in the figure, an integrated axial flux direct drive centrifugal pump with internal circulation self-cooling includes a fluid rotation module 1, an electromagnetic direct drive module 2 and a drive control module 3 arranged on one side of the fluid rotation module 1; the fluid rotation module 1 includes a pump body 101 and an impeller 103 arranged at the fluid inlet 102 of the pump body 101; the electromagnetic direct drive module 2 includes a motor housing 204 connected to the pump body 101, a drive main shaft 201 is arranged in the motor housing 204, the drive main shaft 201 is connected to the impeller 103, a sealed rotor assembly 202 is arranged on the drive main shaft 201, a stator assembly 203 arranged opposite to the rotor assembly 202 is sealed and installed in the motor housing 204, a gap channel 4 is arranged between the stator assembly 203 and the rotor assembly 202, and a bearing assembly 205 connected to the motor housing 204 is also arranged on the drive main shaft 201; a rear chamber 207 is arranged at the rear end of the motor housing 204, a first fluid channel 2056 connecting the fluid inlet 102 and the gap channel 4 is arranged on the bearing assembly near the side where the impeller 103 is located, a second fluid channel 2057 connecting the gap channel 4 and the rear chamber 207 is arranged on the bearing assembly near the side where the rear chamber 207 is located, and a main shaft cooling flow channel 209 connecting the rear chamber 207 and the impeller 103 is also arranged axially in the drive main shaft 201.

[0023] By improving the heat dissipation methods of the drive main shaft 201, the motor housing 204, the rotor assembly 202 and the stator assembly 203 of the integrated axial flux direct drive centrifugal pump with internal circulation self-cooling, the drive part of the whole centrifugal pump not only has a compact structure and small volume, but also has excellent self-cooling ability, avoiding failure damage caused by high temperature, ensuring stability and safety under high load, and meeting the requirements of industrial production.

[0024] The fluid inlet 102 is arranged on the side of the pump body 101. Installing the motor housing 204 on the outer wall of the pump body 101 at the fluid inlet 102 can directly extend the drive main shaft 201 in the electromagnetic direct drive module 2 into the fluid inlet 102 and connect and install the impeller 103, so that the impeller 103 is located in the fluid inlet 102 and rotates under the drive of the electromagnetic direct drive module 2, pumping the fluid inhaled in the axial direction out in the circumferential direction. In this structure, there is still a chamber between the fluid inlet 102 and the motor housing 204 where the impeller 103 is located. Part of the fluid will flow into this chamber during the pumping process, and the fluid flowing into this chamber can be used to cool the electromagnetic direct drive module.

[0025] For the electromagnetic direct drive module 2, the installation positions and installation methods of the rotor assembly 202 and the stator assembly 203 are improved. Not only can they be oppositely arranged to drive the rotation of the drive main shaft by magnetically driving the rotor assembly, but also the gap channel 4 between them can be used as one of the fluid channels to allow the cooled fluid to pass through. The motor housing 204 can be directly mounted on the drive main shaft 201 through the bearing assembly 205. The motor housing 204 itself not only serves as the outer housing of the electromagnetic direct drive module 2, but also as the mounting bracket for the stator assembly 203, eliminating the need to additionally arrange components such as stator brackets inside the motor housing. The bearing assembly 205 has been improved in its structure while providing rotational support. The first fluid channel 2056 or the second fluid channel 2057 is provided inside it to allow the cooling fluid to pass through. The structures of the two fluid channels are basically the same, except that they are arranged in the left and right bearing assemblies respectively.

[0026] The rear chamber 207 is provided behind the motor housing 204, which can receive and accommodate the circulated cooling fluid, so that the cooling fluid can enter the drive main shaft 201 from the end of the drive main shaft to cool the drive main shaft 201 and then discharge the cooling fluid to the impeller 103 again. The rear chamber 207 can also accommodate other components, such as an additional shower head, to improve the cooling and circulation effects.

[0027] Through the settings of the fluid port, the gap channel, the first fluid channel, the second fluid channel, the rear chamber, and the main shaft cooling channel, this centrifugal pump can use a small part of the pumped fluid as the cooling fluid to cool the entire electromagnetic direct drive module during operation, eliminating the need to additionally install motor cooling components, greatly simplifying the structure of the electromagnetic direct drive module and greatly improving the cooling effect of the electromagnetic direct drive module.

[0028] Specifically, as shown in Figure 6 , when the impeller 103 rotates, a part of the fluid will flow into the chamber on one side of the fluid port 102. These fluids will then enter the rear chamber 207 through the first fluid channel 2056, the gap channel 4, and the second fluid channel 2057 in sequence. During this process, the fluid will cool the passing bearing assembly 205, stator assembly 203, rotor assembly 202, etc. in real time; the fluid in the rear chamber 207 further enters the main shaft cooling channel 209 to cool the drive main shaft 201, and discharges the fluid back into the impeller 103 to mix with the fluid inhaled by the impeller. Through this continuous cyclic operation, while the centrifugal pump transports the fluid (liquid), the components of the entire centrifugal pump are cooled, ensuring the stability, safety, and operating efficiency of the centrifugal pump under high loads.

[0029] Furthermore, a flow channel groove 106 is provided in the flow port 102, and the outer periphery of the impeller 103 is arranged at the flow channel groove 106; a discharge port 105 is provided on the outer periphery of the flow channel groove 106, and a suction port 104 communicating with the flow port is provided in the pump body 101 corresponding to the axial direction of the impeller 103.

[0030] The flow channel groove 106 can be a vortex channel so that the impeller discharges the fluid from the discharge port on the outer periphery of the fluid groove. An installation groove can also be provided at a position in the flow port 102 close to the suction port for placing a radial thrust bearing. The radial thrust bearing is sleeved on the outer periphery of the middle suction pipe of the impeller. On the one hand, it can support the impeller and improve the support stability of the impeller. On the other hand, it is also beneficial to the rotation of the impeller and can increase the kinetic energy of the fluid.

[0031] Furthermore, in combination Figures 7 to 9 As shown, a partition plate 2011 is provided on the outer periphery of the driving main shaft 201. Rotor installation grooves 2012 are respectively provided on both sides of the partition plate 2011, and the rotor assemblies 202 are respectively installed in the rotor installation grooves 2012. Bearing assemblies 205 are respectively connected to the outer peripheries of the driving main shaft 201 on both sides of the partition plate 2011; through the setting of the partition plate 2011, the rotor assemblies 202 can be installed at both axial ends respectively. In this way, not only can the occupation of axial space be reduced and the length of the driving main shaft be reduced, but also two groups of rotor assemblies, that is, more permanent magnets, can be installed at the same time. Cooperating with the setting of the stator assembly, greater torque and power can be provided.

[0032] The main shaft cooling flow channel 209 includes a central flow channel 2091 provided on the axis of the driving main shaft 201 and Tesla channels 2092 communicating with the central flow channel 2091. The central flow channel 2091 can be used to convey fluid from high pressure to low pressure, and the Tesla channels 2092 can prevent fluid backflow and enhance the cooling effect. The Tesla channels are arranged at one end close to the rear chamber, and the Tesla channels can be arranged individually, or arranged at intervals or continuously.

[0033] Furthermore, a number of spiral flow channels 2013 are provided in the partition plate 2011 and the driving main shaft 201, and each spiral flow channel 2013 extends from the outer periphery of the partition plate 2011 to the central flow channel 2091. Through these spiral flow channels 2013, the cooling fluid (a part of the cooling fluid) entering the driving main shaft can be thrown into the motor housing again, that is, the area between the outer periphery of the partition plate and the inner wall of the motor housing, to further dissipate heat from the partition plate and the rotor assembly therein.

[0034] In this embodiment, the inner diameter of the spiral flow channel 2013 is gradually increased from the center outwards. Four spiral flow channels flow out from the center, and each is divided into two branches and diverted to the outer periphery of the partition plate. The fluid slowly expands from the axial center outwards, which on the one hand increases the outlet pressure, and on the other hand expands the contact area and enhances cooling.

[0035] Further, as shown in combination with Figure 10 and Figure 11 the rotor assembly 202 includes a rotor core 2021, permanent magnets 2022, and a rotor sealing thin plate 2023; a plurality of the permanent magnets 2022 are evenly distributed on the rotor core 2021, the rotor core 2021 is installed in the rotor installation groove 2012, and the rotor sealing thin plate 2023 is installed at the notch of the rotor installation groove 2012. This installation method is not only convenient and simple, but also has good sealing performance, and can prevent the cooling fluid flowing through the gap channel from entering the rotor assembly.

[0036] In this embodiment, there are 32 permanent magnets 2022, 16 on each side, evenly distributed on the rotor core 2021; the rotor core 2021 is pasted in the rotor installation groove 2012 of the partition plate, and glue is filled in the rotor installation groove 2012 for fixing the rotor and sealing; then a layer of the rotor sealing thin plate 2023 is pasted on the outside to further seal the rotor assembly 202.

[0037] Further, as shown in combination with Figure 12 the two ends of the motor housing 204 are provided with annular housing end plates 2041, stator installation grooves are respectively arranged on the inner sides of the housing end plates 2041, and the stator assembly 203 is arranged in the stator installation grooves; the inner circumferences of the housing end plates 2041 are sleeved and connected to the bearing assembly 205, the housing end plate close to the impeller side is hermetically connected to the end face of the pump body, and the other housing end plate is connected with a motor rear cover 206, and a rear chamber 207 is arranged in the motor rear cover 206.

[0038] The housing end plate is similar to the front and rear end plates of the motor housing. The stator installation groove is opened on its inner wall, which can accommodate and install the stator assembly on the inner end face and is arranged opposite to the aforementioned rotor assembly. This installation structure is not only convenient and simple, but also does not require an additional stator bracket, simplifying the internal structure of the motor. The setting of the bearing assembly can directly rotate and support the housing end plate (that is, the motor housing), and also facilitates the driving main shaft to extend out of the motor. The setting of the motor rear cover is both for encapsulating the motor housing and for forming the rear chamber.

[0039] Further, the stator assembly 203 includes a stator core 2031 installed in the stator installation groove. A stator winding is provided on the stator core 2031. A stator sealing thin plate 2032 is provided at the notch of the stator installation groove. A wire routing channel 2042 communicating with the stator installation groove is further provided in the motor housing 204. Since the stator assembly is arranged around the axis, the stator installation groove is an annular groove, and the stator sealing thin plate is an annular thin plate.

[0040] In this embodiment, there are two sets of the stator assemblies 203, which are respectively fixed in the stator installation grooves of the two housing end plates 2041. The stator core can also be potted for fixation and sealing. The stator sealing thin plate is pasted on the outer side of the stator installation groove to further seal the motor stator.

[0041] Further, as shown in Figures 13 - 15 The bearing assembly 205 includes a thrust plate seat 2051, a thrust plate rotor ring 2052, a shaft sleeve 2053, a bearing inner lining 2054, and a bearing housing 2055. The thrust plate seat 2051 and the shaft sleeve 2053 are both arranged on the drive main shaft 201. One end of the shaft sleeve 2053 abuts against the thrust plate seat 2051. The bearing inner lining 2054 and the thrust plate rotor ring 2052 are sleeved on the shaft sleeve 2053. The thrust plate rotor ring 2052 is arranged between the bearing inner lining 2054 and the thrust plate seat 2051. The bearing housing 2055 is arranged outside the bearing inner lining 2054. The bearing housing 2055 is connected to the motor housing 204 (outside the housing end plate 2041) by bolts. A plurality of the first fluid channels 2056 or the second fluid channels 2057 are provided in the bearing inner lining 2054.

[0042] The bearing assembly arranged in this structure can preferably connect and install the drive main shaft and the motor housing. By providing the first fluid channels 2056 or the second fluid channels 2057 on the bearing inner lining, the chambers in the front and rear directions of the motor housing can be communicated, enabling the cooling fluid at the fluid outlet to enter the gap channel 4, and also guiding the cooling fluid in the gap channel 4 to the rear chamber 207.

[0043] For the bearing inner lining 2054, the first fluid channels 2056 or the second fluid channels 2057 thereon each include radial portions at both ends and an axial portion on the inner circumference.

[0044] On the bearing assembly close to the side where the rear chamber is located, a connection groove 2058 is further provided on the side surface of the bearing housing. The connection groove 2058 is provided with threads and can be used for connecting and installing a cooling shower head 208.

[0045] Further, in combination with Figures 16 - 18 As shown, a cooling shower head 208 is further provided in the rear chamber 207. The cooling shower head 208 includes an outer curved surface 2081 and an inner curved surface 2082 connected as a whole. A shower head inner cavity 2086 is provided between the outer curved surface 2081 and the inner curved surface 2082. A plurality of holes 2083 are provided on the inner curved surface 2082. A connecting ring 2084 is provided in the middle of the inner curved surface 2082. The connecting ring 2084 is connected to the bearing assembly away from the impeller. An axial channel 2085 extending in the direction of the main shaft cooling channel 209 is provided in the middle of the outer curved surface 2081. The axial channel 2085 is connected to the main shaft cooling channel 209.

[0046] The cooling shower head 208 is integrally in the shape of an inwardly concave disc. The outer curved surface and the inner curved surface are smoothly transitioned in an arc shape. The connecting ring 2084 provided in the middle of the inner curved surface can be connected to the connecting groove 2058 on the bearing seat. Threads are provided on the outer periphery of the connecting ring and can be directly screwed in. A radial edge is also provided on the outer periphery of the connecting ring. With the setting of the gasket, it can be better connected and fixed to the bearing seat.

[0047] The inner curved surface 2082 is provided with holes 2083 that increase in size from the inner diameter to the outer diameter for flowing out the same flow rate of cooling liquid, so as to cool the motor housing and the stator assembly evenly. Also, the cooling liquid flows out from the inner curved surface and then flows in the rear chamber to one side of the outer curved surface, and then flows to the main shaft cooling channel through the axial channel in the middle of the outer curved surface.

[0048] Further, in combination with Figure 19 As shown, the drive control module 3 includes a driver housing 301 installed outside the pump body. A driver 302 is provided in the driver housing 301. The driver 302 is connected to the electromagnetic direct drive module through a wiring channel on the driver housing. The side wall and the peripheral wall shared by the driver housing 301 and the pump body 101 are respectively provided with serpentine channels 303. The serpentine channels 303 are communicated with the inner cavity of the pump body 101. The fluid in the pump body can enter the serpentine channels 303, so that these fluids can be used to dissipate heat and cool the drive control module 3.

[0049] Further, this centrifugal pump is also equipped with a temperature sensor, a pressure sensor and a speed sensor; the temperature sensor is installed at the stator assembly for measuring the motor temperature; the pressure sensor is installed in the stator installation groove or the motor housing for detecting the cavity pressure; the speed sensor is installed on the side of the drive main shaft for measuring the rotational speed and direction of the shaft. Embodiment 2

[0050] On the basis of Embodiment 1, this embodiment provides a stator sealing cover plate with another structure, and a heat transfer structure is further arranged on the inner side of the stator sealing cover plate.

[0051] Specifically, as Figures 20 to 22 shown, the heat transfer structure includes a plurality of annular ribs and radial ribs arranged on the surface (back surface) of the stator sealing cover plate facing the stator core. The plurality of annular ribs are respectively arranged near the inner circle and the outer circle of the stator sealing cover plate. The plurality of annular ribs are concentrically arranged. After assembly, the annular ribs extend into the stator installation groove and are located on the outer periphery and the inner periphery of the stator core. The upper annular rib is also provided with rib plate routing holes, and the rib plate routing holes are arranged corresponding to the routing channels 2042, so that the stator winding (cable) can pass through. The radial ribs are short ribs, and are densely arranged at intervals into several groups. The several groups of radial ribs are arranged along the radial direction of the stator sealing cover plate and are located between the annular ribs of the inner circle and the outer circle, and the radial ribs are arranged corresponding to the stator core. In some embodiments, some heat exchange grooves can be arranged on the surface of the stator core, and the radial ribs can be inserted into the heat exchange grooves.

[0052] Through the arrangement of the annular ribs and the radial ribs, not only can the strength and stability of the stator sealing thin plate 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.

[0053] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirits of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An integrated axial magnetic flux direct-drive centrifugal pump with internal circulation and self-cooling, characterized in that: The invention comprises a fluid rotation module, and an electromagnetic direct drive module and a drive control module arranged on one side of the fluid rotation module; the fluid rotation module comprises a pump body, and an impeller arranged at a flow passage opening of the pump body; the electromagnetic direct drive module comprises a motor housing connected to the pump body, a driving spindle is arranged in the motor housing, the driving spindle is connected to the impeller, a sealed rotor assembly is arranged on the driving spindle, a stator assembly arranged opposite to the rotor assembly is sealed and installed in the motor housing, a gap channel is arranged between the stator assembly and the rotor assembly, and a bearing assembly connected to the motor housing is also arranged on the driving spindle; a rear chamber is arranged at the rear end of the motor housing, a first fluid channel connecting the flow passage opening and the gap channel is arranged on the bearing assembly close to the impeller side, a second fluid channel connecting the gap channel and the rear chamber is arranged on the bearing assembly close to the rear chamber side, and a spindle cooling channel connecting the rear chamber and the impeller is also arranged in the driving spindle along the axial direction.

2. The internal circulation self-cooling integrated axial magnetic flux direct-drive centrifugal pump according to claim 1, characterized in that: A flow channel groove is provided in the flow channel opening, and the outer periphery of the impeller is arranged at the flow channel groove; a discharge port is provided at the outer periphery of the flow channel groove, and a suction port connected to the flow channel opening is provided in the pump body corresponding to the axial direction of the impeller.

3. The internal circulation self-cooling integrated axial magnetic flux direct-drive centrifugal pump according to claim 1, characterized in that: A partition plate is provided on the outer periphery of the driving spindle, and rotor mounting grooves are respectively provided on both sides of the partition plate, and the rotor assemblies are respectively installed in the rotor mounting grooves, and the driving spindle is respectively connected to the bearing assemblies on the outer peripheries on both sides of the partition plate; the spindle cooling channel includes a central channel arranged on the axis of the driving spindle, and a Tesla channel connected to the central channel.

4. The internal circulation self-cooling integrated axial magnetic flux direct-drive centrifugal pump according to claim 3, characterized in that: A plurality of spiral flow channels are arranged in the partition plate and the driving main shaft, and each of the spiral flow channels extends from the outer periphery of the partition plate to the central flow channel.

5. The internal circulation self-cooling integrated axial magnetic flux direct-drive centrifugal pump according to claim 3, characterized in that: The rotor assembly includes a rotor core, permanent magnets and a rotor sealing plate; a plurality of the permanent magnets are evenly distributed on the rotor core, the rotor core is installed in the rotor mounting groove, and the rotor sealing plate is installed at the notch of the rotor mounting groove.

6. The internal circulation self-cooling integrated axial magnetic flux direct-drive centrifugal pump according to claim 1, characterized in that: Annular casing end plates are provided at both ends of the motor casing, and stator mounting grooves are respectively provided on the inner sides of the casing end plates, and the stator assembly is arranged in the stator mounting grooves; the inner circumference of the casing end plates is sleeved on and connected to the bearing assembly, the casing end plate on the side close to the impeller is sealed and connected to the end face of the pump body, and the casing end plate on the other side is connected to the motor rear cover, and the rear chamber is arranged in the motor rear cover.

7. The internal circulation self-cooling integrated axial magnetic flux direct-drive centrifugal pump according to claim 6, characterized in that: The stator assembly includes a stator core installed in the stator mounting groove, a stator winding is arranged on the stator core, a stator sealing plate is arranged at the notch of the stator mounting groove, and a wiring channel connected to the stator mounting groove is also arranged in the motor housing; a heat transfer structure is also arranged on the inner side of the stator sealing cover plate.

8. The internal circulation self-cooling integrated axial magnetic flux direct-drive centrifugal pump according to claim 1, characterized in that: The bearing assembly includes a thrust plate seat, a thrust plate rotor ring, a sleeve, a bearing liner and a bearing seat. The thrust plate seat and the sleeve are both arranged on the driving main shaft. One end of the sleeve abuts the thrust plate seat. The bearing liner and the thrust plate rotor ring are sleeved on the sleeve. The thrust plate rotor ring is arranged between the bearing liner and the thrust plate seat. The bearing seat is arranged outside the bearing liner, and the bearing seat is connected to the motor housing. A plurality of the first fluid channels or the second fluid channels are arranged in the bearing liner.

9. The internal circulation self-cooling integrated axial magnetic flux direct-drive centrifugal pump according to claim 1, characterized in that: A cooling shower is also provided in the rear chamber, and the cooling shower includes an outer curved surface and an inner curved surface connected as one body, a shower cavity is provided between the outer curved surface and the inner curved surface, a plurality of holes are provided on the inner curved surface, a connecting ring is provided in the middle of the inner curved surface, the connecting ring is connected to the bearing assembly away from the impeller, an axial channel extending in the direction of the spindle cooling channel is provided in the middle of the outer curved surface, and the axial channel is connected to the spindle cooling channel.

10. The internal circulation self-cooling integrated axial magnetic flux direct-drive centrifugal pump according to claim 1, characterized in that: The drive control module includes a driver housing installed on the outside of the pump body, a driver is arranged in the driver housing, the driver is connected to the electromagnetic direct drive module through a wiring channel on the driver housing, and the side walls and peripheral walls shared by the driver housing and the pump body are respectively provided with serpentine flow channels, and the serpentine flow channels are connected to the inner cavity of the pump body.

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