Low harmonic, low noise, high efficiency, high reliability permanent magnet shield pump

Abstract

This utility model belongs to the field of canned motor pumps and relates to a low-harmonic, low-noise, high-efficiency, and high-reliability permanent magnet canned motor pump, comprising: a pump body; the pump body having an impeller housing cavity, and an inlet and an outlet respectively connected to the impeller housing cavity; a power unit mounted on the pump body; the power unit including a front disc stator, an axial magnetic field rotor, a rear disc stator, an impeller, and an integrated controller; the front disc stator mounted on the pump body, and the rear disc stator mounted on the front disc stator; the axial magnetic field rotor mounted between the front disc stator and the rear disc stator; and the integrated controller mounted on the rear disc stator. The advantages of this structure are: a more compact structure, higher efficiency, lower noise, better cooling and heat dissipation, lower cost due to material savings, and convenient maintenance, making it widely applicable in more fields.

Description

Technical Field

[0001] This utility model belongs to the field of shielded pump technology, specifically, it relates to a low-harmonic, low-noise, high-efficiency, and high-reliability permanent magnet shielded pump. Background Technology

[0002] Traditional permanent magnet shielded water pumps, also known as shielded pumps, are seal-free pumps that combine the functions of a motor and a pump. They transmit power through magnetic coupling, achieving a shaft seal-free design and thus avoiding leakage problems that may be caused by traditional mechanical seals.

[0003] However, traditional permanent magnet canned water pumps have the following main disadvantages: 1. Higher cost: Due to structural and material requirements, canned pumps are generally more expensive than traditional pumps, especially when handling high-temperature or high-pressure media. 2. Difficult maintenance: Once a canned pump malfunctions, professional disassembly and repair are usually required due to its complex internal structure, making self-repair very difficult for users. 3. Bearing lubrication issues: Bearings rely on the medium for lubrication; excessive impurities or incompatible properties in the medium can affect bearing life. 4. Power limitation: In high-power applications, the limitations of magnetic coupling can restrict power output.

[0004] Traditional axial flux motors possess a range of unique advantages and disadvantages, primarily reflected in their structural design, performance, and application scenarios. However, they also have the following drawbacks: 1. Cost: Axial flux motors are generally more expensive to manufacture than traditional radial flux motors, mainly due to the need for specific materials and manufacturing processes. For example, using a yokeless topology and specific stator-rotor designs increases costs. 2. Design and Manufacturing Complexity: The design and production of axial flux motors are typically more complex, requiring the maintenance of uniform air gap between the rotor and stator, which can be challenging in practice. Furthermore, manufacturing processes and machinery are less mature than those for radial motors, limiting the ability to achieve mass production. 3. Heat Dissipation Challenges: The windings of axial flux motors are located deep within the stator and between the two rotor discs, making them prone to overheating under high loads, impacting motor performance and lifespan. Utility Model Content

[0005] To address the aforementioned problems in the prior art, this utility model provides a low-harmonic, low-noise, high-efficiency, and high-reliability permanent magnet shielded pump.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] As one aspect of this utility model, a low-harmonic, low-noise, high-efficiency, and high-reliability permanent magnet shielded pump is proposed, which includes: a pump body; the pump body has an impeller receiving cavity, and the pump body is provided with an inlet and an outlet, the inlet and the outlet being respectively connected to the impeller receiving cavity;

[0008] The power unit includes a front disc stator, an axial magnetic field rotor, a rear disc stator, an impeller, and an integrated controller. The axial magnetic field rotor is mounted on the front disc stator, and the impeller is connected to the axial magnetic field rotor. The front disc stator is mounted on the pump body, and the rear disc stator is mounted on the front disc stator. The axial magnetic field rotor is mounted between the front disc stator and the rear disc stator. The integrated controller is mounted on the rear disc stator, and the front disc stator and the rear disc stator are electrically connected to the corresponding AC output terminals of the integrated controller. The DC power line and the controller signal line of the integrated controller extend to the outside of the integrated controller and are assembled into the power unit. The power unit is mounted on the pump body.

[0009] Furthermore, the front disc stator includes a front cover-type annular housing, in which a first wound stator core is installed. A front stator mounting groove is formed on the right end face of the front cover-type annular housing, and the first wound stator core is installed in the front stator mounting groove. A front disc stator shielding cover is installed on the groove end face of the front stator mounting groove. The front disc stator lead of the first wound stator core passes through the front disc stator shielding cover and is electrically connected to the corresponding AC output terminal of the integrated controller.

[0010] Furthermore, the space between the first winding stator core, the front stator mounting groove, and the front disc stator shielding cover is filled with thermally conductive sealant to form an integrated waterproof disc stator.

[0011] Furthermore, each of the first wound stator cores includes 12 front disc toothed cores and 1 front disc yoke core. The front disc toothed cores are mounted on the front disc yoke core, and each of the front disc toothed cores is wound with a front disc stator winding coil. The front disc stator winding coil is first mounted on the front disc toothed core, and then the front disc toothed core is welded and fixed to the front disc yoke core to form the first wound stator core. The front disc yoke core has welding holes. After the front disc toothed core is mounted on the front disc yoke core, the welding holes are fully welded to connect the front disc toothed core and the front disc yoke core. The silicon steel magnetic direction of the front disc toothed core forms an angle of 20° with the axial magnetic field direction of the axial magnetic field rotor.

[0012] The front cover type annular housing has a front cover mounting hole in the middle, and a front silicon carbide bearing is installed in the front cover mounting hole; a front retaining ring is installed in the front cover mounting hole, and the front retaining ring limits the installation of the front silicon carbide bearing in the front cover mounting hole.

[0013] Furthermore, the rear-plate stator includes a rear-end cover-type annular housing, and the heat dissipation base plate of the integrated controller is directly mounted on the rear-end cover-type annular housing; a second wound stator core is installed inside the rear-end cover-type annular housing, a rear stator mounting groove is formed on the left end face of the rear-end cover-type annular housing, the second wound stator core is installed in the rear stator mounting groove, a rear-plate stator shielding cover is installed on the groove end face of the rear stator mounting groove, and the rear-plate stator leads of the second wound stator core pass through the rear-end cover-type annular housing and are electrically connected to the corresponding AC output terminal of the integrated controller.

[0014] Furthermore, the second winding stator core, the rear stator mounting groove, and the rear disc stator shielding cover are filled with thermally conductive sealant to form an integrated waterproof disc stator.

[0015] Furthermore, each of the second wound stator cores includes 12 rear disc toothed cores and 1 rear disc yoke core. The rear disc toothed cores are mounted on the rear disc yoke core, and each of the rear disc toothed cores is wound with a rear disc stator winding coil. The rear disc stator winding coil is first mounted on the rear disc toothed core, and then the rear disc toothed core is welded and fixed to the rear disc yoke core to form the second wound stator core. The rear disc yoke core has welding holes. After the rear disc toothed core is mounted on the rear disc yoke core, the welding holes are fully welded to connect the rear disc toothed core and the rear disc yoke core. The silicon steel magnetic direction of the rear disc toothed core forms an angle of 20° with the axial magnetic field direction of the axial magnetic field rotor.

[0016] The rear end cover type annular housing has a rear end cover mounting hole in the middle, and a rear silicon carbide bearing is installed in the rear end cover mounting hole; a rear retaining ring is installed in the rear end cover mounting hole, and the rear retaining ring limits the installation of the rear silicon carbide bearing in the rear end cover mounting hole.

[0017] Furthermore, the axial magnetic field rotor includes a shaft made of stainless steel; the front and rear middle sections of the shaft are thermally sprayed with ceramic layers to form a front ceramic layer and a rear ceramic layer; the front ceramic layer mates with a front silicon carbide bearing, and the rear ceramic layer mates with a rear silicon carbide bearing; an impeller is installed on one side of the shaft, and the impeller is located in an impeller receiving cavity; an impeller locking nut is threaded onto the side of the shaft, and the impeller locking nut locks the impeller onto the shaft; a ceramic ball bearing is installed on the other side of the shaft, and a bearing pressure ring is installed on the other side of the shaft;

[0018] A coreless magnetic steel rotor is mounted on the rotating shaft, and the coreless magnetic steel rotor is located within a preset interval between the first wound stator core and the second wound stator core.

[0019] Furthermore, the coreless magnet rotor includes a magnet fixing disk, with a fixing disk mounting hole in the middle of the fixing disk, which is connected to the rotating shaft; the magnet fixing disk has 8 magnet mounting slots, which are arranged in a circular array around the fixing disk mounting hole; axial magnetic field magnets are installed in the magnet mounting slots; the two end faces of the axial magnetic field magnets are filled with waterproof insulating varnish to form an integrated waterproof disc-type axial coreless magnet rotor.

[0020] Furthermore, there is a 0.5mm preset gap between the front surface of the axial magnetic field magnet and the front surface of the magnet fixing plate, and there is a 0.5mm preset gap between the rear surface of the axial magnetic field magnet and the rear surface of the magnet fixing plate.

[0021] This utility model of a low-harmonic, low-noise, high-efficiency, and high-reliability permanent magnet shielded pump offers several advantages, including a more compact structure, higher efficiency, lower noise, better cooling and heat dissipation, lower cost due to the use of less material, and easier maintenance. It can be widely applied in more fields and is particularly suitable for applications with high safety and environmental protection requirements and limited space, such as those in the chemical, petroleum, and pharmaceutical industries. It demonstrates significant application potential in multiple sectors. Attached Figure Description

[0022] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention.

[0023] Figure 1 This is a schematic diagram of the structure of the low harmonic, low noise, high efficiency and high reliability permanent magnet shielded pump of this utility model;

[0024] Figure 2 This is a cross-sectional view of the front disc stator of this utility model;

[0025] Figure 3 This is a right view of the front disc stator structure of this utility model;

[0026] Figure 4 This is a left view of the front disc stator structure of this utility model;

[0027] Figure 5 This is a cross-sectional view of the rear disc stator of this utility model;

[0028] Figure 6 This is a right view of the structure of the rear disc stator of this utility model;

[0029] Figure 7 This is a left view of the structure of the rear disc stator of this utility model;

[0030] Figure 8This is a schematic diagram of the magnetic direction of silicon steel in the front disc tooth core of this utility model.

[0031] Figure 9 This is a schematic diagram of the insulating layer structure of this utility model;

[0032] Figure 10 This is a cross-sectional view of the front disc toothed iron core of this utility model;

[0033] Figure 11 This is a right view of the structure of the front disc toothed iron core of this utility model;

[0034] Figure 12 This is a left view of the front disc toothed iron core structure of this utility model;

[0035] Figure 13 This is a schematic diagram of the axial magnetic field rotor of this utility model;

[0036] Figure 14 This is a cross-sectional view of the magnetic steel fixing plate of this utility model;

[0037] Figure 15 This is a side view of the structure of the magnetic steel fixing plate of this utility model. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0039] One embodiment of this application provides a low-harmonic, low-noise, high-efficiency, and high-reliability permanent magnet shielded pump, such as... Figure 1 As shown, it includes: a pump body 1, which is made of stainless steel; the pump body 1 has an impeller housing cavity 11, and the pump body 1 is provided with an inlet 12 and an outlet 13, which are respectively connected to the impeller housing cavity 11; the medium enters from the inlet 12, flows out from the outlet 13 through the impeller housing cavity 11;

[0040] Power unit 2 includes a front disc stator 21, an axial magnetic field rotor 22, a rear disc stator 23, an impeller 224, and an integrated controller 24. The axial magnetic field rotor 22 is mounted on the front disc stator 21, and the impeller 224 is connected to the axial magnetic field rotor 22. The front disc stator 21 is mounted on the pump body 1, and the rear disc stator 23 is mounted on the front disc stator 21. The axial magnetic field rotor 22 is mounted between the front disc stator 21 and the rear disc stator 23. The integrated controller 24 is mounted on the rear disc stator 23. The front disc stator 21 and the rear disc stator 23 are electrically connected to the corresponding AC output terminals of the integrated controller 24; the DC power line 241 and the controller signal line 242 of the integrated controller 24 extend to the outside of the integrated controller 24 and are assembled into a power unit 2; the power unit 2 is mounted on the pump body 1; it should be noted that the integrated controller 24 is existing known technology and will not be described in detail here; the DC power line 241 and the controller signal line 242 of the integrated controller 24 extend to the outside of the integrated controller 24 for easy wiring.

[0041] In one embodiment, such as Figures 2-4 and Figures 10-12 As shown, the front disc stator 21 includes a front cover-type annular housing 212. A first wound stator core 213 is installed inside the front cover-type annular housing 212. A front stator mounting groove is formed on the right end face of the front cover-type annular housing 212. The first wound stator core 213 is installed in the front stator mounting groove. A front disc stator shielding cover plate 214 is installed on the groove end face of the front stator mounting groove. The front disc stator lead 215 of the first wound stator core 213 passes through the front disc stator shielding cover plate 214 and is electrically connected to the corresponding AC output terminal of the integrated controller 24. It should be noted that the front disc stator shielding cover plate 214 has through holes for the front disc stator lead 215 to pass through. The front disc stator lead 215 is made of heat-shrinkable Teflon material to achieve waterproof shielding performance.

[0042] As an example, thermally conductive sealant 8 is filled between the first wound stator core 213, the front stator mounting groove and the front disc stator shielding cover 214 to form an integrated waterproof disc stator.

[0043] Each of the first wound stator cores 213 includes 12 front disc toothed cores 2131 and 1 front disc yoke core 2132. The front disc toothed cores 2131 are mounted on the front disc yoke core 2132, and each of the front disc toothed cores 2131 is wound with a front disc stator winding coil 2133. For ease of assembly, the front disc stator winding coil 2133 is first mounted on the front disc toothed cores 2131, and then the front disc toothed cores 2131 are welded and fixed to the front disc yoke core. A first wound stator core 213 is formed on core 2132; the front disc yoke core 2132 has welding holes, and after the front disc toothed core 2131 is installed on the front disc yoke core 2132, the welding holes are fully welded, making the connection between the front disc toothed core 2131 and the front disc yoke core 2132 more reliable; it should be noted that the structures of the front disc toothed core 2131, the front disc yoke core 2132 and the front disc stator winding coil 2133 are all existing known technologies, and will not be described in detail here;

[0044] The front cover type annular housing 212 has a front cover mounting hole 218 in the middle, and a front silicon carbide bearing 216 is installed in the front cover mounting hole 218; a front retaining ring 217 is installed in the front cover mounting hole 218, and the front retaining ring 217 limits the installation of the front silicon carbide bearing 216 in the front cover mounting hole 218.

[0045] In one embodiment, such as Figures 5-7 As shown, the rear-disc stator 23 includes a rear end cover annular housing 231, and the heat dissipation base plate of the integrated controller 24 is directly mounted on the rear end cover annular housing 231. A second wound stator core 232 is installed inside the rear end cover annular housing 231. A rear stator mounting groove is formed on the left end face of the rear end cover annular housing 231. The second wound stator core 232 is installed in the rear stator mounting groove. A rear-disc stator shielding cover plate 233 is installed on the groove end face of the rear stator mounting groove. The rear-disc stator lead 2324 of the second wound stator core 232 passes through the rear end cover annular housing 231 and is electrically connected to the corresponding AC output terminal of the integrated controller 24. It should be noted that the rear end cover annular housing 231 has through holes for the rear-disc stator lead 2324 to pass through. The rear-disc stator lead 2324 is made of heat-shrinkable Teflon material to achieve waterproof shielding performance.

[0046] The second winding stator core 232, the rear stator mounting groove and the rear disc stator shielding cover 233 are filled with thermally conductive sealant 8 to form an integrated waterproof disc stator;

[0047] Each of the second wound stator cores 232 includes 12 rear disc toothed cores 2321 and 1 rear disc yoke core 2322. The rear disc toothed cores 2321 are mounted on the rear disc yoke core 2322, and each of the rear disc toothed cores 2321 is wound with a rear disc stator winding coil 2323. For ease of assembly, the rear disc stator winding coil 2323 is first mounted on the rear disc toothed core 2321, and then the rear disc toothed core 2321 is welded and fixed to the rear disc yoke. A second wound stator core 232 is formed on core 2322; the rear disc yoke core 2322 has welding holes, and after the rear disc toothed core 2321 is installed on the rear disc yoke core 2322, the welding holes are fully welded, making the connection between the rear disc toothed core 2321 and the rear disc yoke core 2322 more reliable; it should be noted that the structures of the rear disc toothed core 2321, the rear disc yoke core 2322 and the rear disc stator winding coil 2323 are all existing known technologies, and will not be described in detail here;

[0048] The rear end cover type annular housing 231 has a rear end cover mounting hole 234 in the middle, and a rear silicon carbide bearing 235 is installed in the rear end cover mounting hole 234; a rear retaining ring 236 is installed in the rear end cover mounting hole 234, and the rear retaining ring 236 limits the installation of the rear silicon carbide bearing 235 in the rear end cover mounting hole 234.

[0049] In this embodiment, as Figure 8 As shown, the silicon steel magnetic direction of the front disc tooth core 2131 forms an angle with the axial magnetic field direction of the axial magnetic field rotor 22, and the angle is 20°.

[0050] The magnetic direction of the silicon steel in the rear disc tooth core 2321 forms an angle of 20° with the axial magnetic field direction of the axial magnetic field rotor 22. It should be noted that both the front disc tooth core 2131 and the rear disc tooth core 2321 are composed of several stator tooth core silicon steel laminations stacked together; this is existing known technology and will not be elaborated further. During winding, the winding surfaces of the front disc tooth core 2131 and the rear disc tooth core 2321 are injection-molded with an insulating layer 36, such as... Figure 9 As shown;

[0051] The above design, equivalent to stator skew, effectively weakens the tooth harmonic magnetomotive force while having a relatively small impact on the fundamental magnetomotive force, significantly reducing electromagnetic noise and vibration. Furthermore, within a 20° skew angle range, the improved magnetic flux distribution in the stator core reduces hysteresis and eddy current losses, greatly reducing iron losses and improving the overall efficiency of the permanent magnet shielded motor by 0.5% - 1%. Traditional skewed slots increase the straight length of the coil, increasing resistance, copper losses, and reducing efficiency. In this embodiment, the magnetic field direction forms an angle with the magnetic conduction direction of the oriented silicon steel core, and the core teeth are not skewed. Therefore, the diameter of the winding does not increase, the winding resistance remains unchanged, ensuring that the motor's copper losses do not increase and maintaining high efficiency.

[0052] In one embodiment, such as Figure 13 As shown, the axial magnetic field rotor 22 includes a shaft 221 made of stainless steel; the front and rear middle sections of the shaft 221 are thermally sprayed with ceramic layers to form a front ceramic layer 222 and a rear ceramic layer 223; the front ceramic layer 222 mates with a front silicon carbide bearing 216, and the rear ceramic layer 223 mates with a rear silicon carbide bearing 235; an impeller 224 is mounted on one side of the shaft 221, the impeller 224 is located in the impeller receiving cavity 11, and the impeller 224 is made of stainless steel; the shaft 221... The impeller 224 is locked to the shaft 221 by a threaded connection on the side end of shaft 221. A ceramic ball bearing 226 is installed on the other side end of shaft 221, and a bearing pressure ring 227 is installed on the other side end of shaft 221. The bearing pressure ring 227 limits the ceramic ball bearing 226. A stainless steel shaft is used, and a ceramic layer is thermally sprayed onto the bearing position, which effectively prevents and eliminates the disadvantages of previous water bearings, such as short life and easy wear, and ceramic shafts being broken by overload impact of the medium.

[0053] A coreless magnet rotor 228 is mounted on the rotating shaft 221. The coreless magnet rotor 228 is located within a preset interval between the first wound stator core 213 and the second wound stator core 232.

[0054] In one embodiment, such as Figures 13-15As shown, the coreless magnet rotor 228 includes a magnet fixing disk 2281, with a fixing disk mounting hole in the middle of the fixing disk 2281, which is connected to the rotating shaft 221; the magnet fixing disk 2281 has eight magnet mounting slots, which are arranged in a circular array around the fixing disk mounting hole; axial magnetic field magnets 2282 are installed in the magnet mounting slots; the two end faces of the axial magnetic field magnets 2282 are filled with waterproof insulating varnish 2283 to form an integrated waterproof disk-type axial coreless magnet rotor 228. The rotor is made of iron core magnet steel. There is a 0.5mm preset gap between the front surface of the axial magnetic field magnet 2282 and the front surface of the magnet fixing plate 2281, and a 0.5mm preset gap between the rear surface of the axial magnetic field magnet 2282 and the rear surface of the magnet fixing plate 2281, which serves as a glue storage space. The axial magnetic field magnet 2282 is integrally molded with the magnet fixing plate 2281 by injection molding process to achieve anti-corrosion shielding protection function. The fixing plate mounting hole of the magnet fixing plate 2281 is interference-fitted onto the rotating shaft 221.

[0055] Furthermore, such as Figure 1 As shown, the pump body 1 has a first mounting hole, and the front disc stator 21 has a first front mounting hole corresponding to the first mounting hole. The first mounting hole and the first front mounting hole are connected by a pump body locking bolt 3 and a pump body locking nut 4.

[0056] Furthermore, such as Figure 1 As shown, the impeller receiving cavity 11 of the pump body 1 has an installation recess at the end of the cavity opening, and the front cover annular housing 212 of the front disc stator 21 has a connecting protrusion 211 that matches the installation recess, making the installation of the two more convenient; a pump body sealing ring 5 is installed between the pump body 1 and the front disc stator 21.

[0057] Furthermore, such as Figure 1 As shown, the front disc stator 21 has a second front mounting hole, and the rear disc stator 23 has a first rear mounting hole corresponding to the second front mounting hole. The second front mounting hole and the first rear mounting hole are connected by stator set bolts 6. A disc stator sealing ring 7 is installed between the front disc stator 21 and the rear disc stator 23.

[0058] In this embodiment, an axial magnetic field rotor 22 is built between the front disc stator 21 and the rear disc stator 23. The front disc stator 21 and the rear disc stator 23 each have 12 toothed iron cores, each with a winding coil embedded in it, which is then fixed to a yoke core to form a wound stator core. The wound stator core is fixed inside an end-cap type annular housing. A stator shielding cover is installed on the end face of the stator mounting slot and filled with thermally conductive sealant to form an integrated waterproof disc stator. Silicon carbide bearings are installed inside the front disc stator 21 and the rear disc stator 23. The front disc stator 21 and the rear disc stator 23 are connected to the axial magnetic field rotor 22 via corresponding silicon carbide bearings, generating a permanent magnet magnetic field. This allows the rotor to rotate and output torque. A full ceramic ball bearing 226 is installed at the rear end of the rear disc stator 23, and the inner ring of the ceramic ball bearing 226 is fixed to the rotating shaft 221 with a bearing pressure ring 227. This axially positions the front disc stator 21, the rear disc stator 23, and the axial magnetic field rotor 22, ensuring uniform air gap between the front disc stator 21, the rear disc stator 23, and the axial magnetic field rotor 22. The front end of the axial magnetic field rotor 22 is fixed to the front end of the rotating shaft with a locking nut, and the pump body is connected to the front disc stator with fastening screws and nuts. The integrated controller is mounted at the rear end of the rear disc stator, and the leads of the front disc stator 21 and the rear disc stator 23 are directly connected to the AC output terminals of the integrated controller.

[0059] The assembly sequence in this embodiment is described below:

[0060] First, install the front disc stator 21 of the power unit 2. A front silicon carbide bearing 216 is installed in the front cover mounting hole 218. A front retaining ring 217 is installed in the front cover mounting hole 218. The front retaining ring 217 limits the installation of the front silicon carbide bearing 216 in the front cover mounting hole 218.

[0061] An axial magnetic field rotor 22 is inserted into the front silicon carbide bearing 216 of the front disc stator 21, with the front ceramic layer 222 engaging with the front silicon carbide bearing 216. Then, the rear disc stator 23 is installed, with the rear ceramic layer 223 engaging with the rear silicon carbide bearing 235. In this way, the power unit assembly is completed.

[0062] The second step is to place the impeller 224 in the impeller receiving cavity 11; the impeller locking nut 225 locks the impeller 224 onto the rotating shaft 221; after assembling the impeller, the pump body 1 is assembled onto the power unit 2.

[0063] The third step is to assemble the integrated controller 24. The integrated controller 24 is mounted on the rear disc stator 23. The front disc stator 21 and the rear disc stator 23 are electrically connected to the corresponding AC output terminals of the integrated controller 24. The DC power line 241 and the controller signal line 242 of the integrated controller 24 extend to the outside of the integrated controller 24.

[0064] In this embodiment, the integrated controller is mounted on the rear base plate of the rear disc stator. Specifically, the heat dissipation base plate of the controller's power devices is directly mounted on the rear cover-type annular housing. The outer surfaces of the front and rear disc stators, the surface and inner surfaces of the iron core gear discs, the outer surface of the axial magnetic field rotor, and the bottom surface of the integrated controller's main board are in direct contact with the working medium. The working medium can directly cool the three annular inner surfaces of the front and rear disc stators, the outer surface of the rotor, and the mounting surface of the integrated controller. This results in more thorough and direct cooling, lower overall temperature rise, less loss, longer system life, and greater overall reliability. This ensures higher efficiency for the canned pump system and overcomes the heat dissipation difficulties inherent in traditional axial magnetic field motors—which typically have two axial magnetic field rotors and a middle axial magnetic field stator. The motor temperature rise is significantly reduced, while motor efficiency is improved, material usage is reduced, and costs are lower.

[0065] In this embodiment, a high-wear-resistant, long-life, and highly reliable bearing combination is formed by thermally spraying a ceramic layer onto a silicon carbide bearing and a stainless steel shaft. This combination is more reliable, lower in cost, easier to assemble, and easier to maintain than traditional plastic water bearings and ceramic shafts.

[0066] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this application.

[0067] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0068] The above description is only a preferred embodiment of the present utility model. All equivalent changes and modifications made within the scope of the patent application of the present utility model shall be covered by the present utility model.

Claims

1. A low harmonic, low noise, high efficiency, high reliability permanent magnet canned pump characterized by, It includes: a pump body (1); the pump body (1) has an impeller receiving cavity (11), the pump body (1) is provided with an inlet (12) and an outlet (13), the inlet (12) and the outlet (13) are respectively connected to the impeller receiving cavity (11); The power unit (2) includes a front disc stator (21), an axial magnetic field rotor (22), a rear disc stator (23), an impeller (224), and an integrated controller (24). The axial magnetic field rotor (22) is mounted on the front disc stator (21), and the impeller (224) is connected to the axial magnetic field rotor (22). The front disc stator (21) is mounted on the pump body (1), and the rear disc stator (23) is mounted on the front disc stator (21). The axial magnetic field rotor (22) is mounted on the front disc stator (21). The integrated controller (24) is installed between the front disc stator (21) and the rear disc stator (23); the integrated controller (24) is installed on the rear disc stator (23), and the front disc stator (21) and the rear disc stator (23) are electrically connected to the corresponding AC output terminals of the integrated controller (24); the DC power line (241) and the controller signal line (242) of the integrated controller (24) extend to the outside of the integrated controller (24) to form a power unit (2); the power unit (2) is installed on the pump body (1).

2. The low harmonic, low noise, high efficiency, high reliability, magnetically shielded pump of claim 1, wherein, The front disc stator (21) includes a front cover annular housing (212), in which a first wound stator core (213) is installed. A front stator mounting groove is formed on the right end face of the front cover annular housing (212), and the first wound stator core (213) is installed in the front stator mounting groove. A front disc stator shielding cover plate (214) is installed on the groove end face of the front stator mounting groove. The front disc stator lead (215) of the first wound stator core (213) passes through the front disc stator shielding cover plate (214) and is electrically connected to the corresponding AC output terminal of the integrated controller (24).

3. The low harmonic, low noise, high efficiency, high reliability, magnetically shielded pump of claim 2, wherein, The first winding stator core (213), the front stator mounting groove and the front disc stator shielding cover (214) are filled with thermally conductive sealant (8) to form an integrated waterproof disc stator.

4. The low harmonic, low noise, high efficiency, high reliability, magnetically shielded pump of claim 2, wherein, Each of the first wound stator cores (213) includes 12 front disc toothed cores (2131) and 1 front disc yoke core (2132). The front disc toothed cores (2131) are mounted on the front disc yoke core (2132). Each of the front disc toothed cores (2131) is wound with a front disc stator winding coil (2133). The front disc stator winding coil (2133) is first mounted on the front disc toothed core (2131), and then the front disc toothed core (2131) is welded and fixed to the front disc yoke core. A first wound stator core (213) is formed on the disc-type yoke core (2132); the front disc-type yoke core (2132) is provided with welding holes, and after the front disc-type toothed core (2131) is installed on the front disc-type yoke core (2132), the welding holes are fully welded to connect the front disc-type toothed core (2131) and the front disc-type yoke core (2132); the silicon steel magnetic direction of the front disc-type toothed core (2131) forms an angle with the axial magnetic field direction of the axial magnetic field rotor (22), and the angle is 20°; The front cover type annular housing (212) has a front cover mounting hole (218) in the middle, and a front silicon carbide bearing (216) is installed in the front cover mounting hole (218); a front retaining ring (217) is installed in the front cover mounting hole (218), and the front retaining ring (217) limits the front silicon carbide bearing (216) to be installed in the front cover mounting hole (218).

5. The low harmonic, low noise, high efficiency, high reliability, magnetically shielded pump, as claimed in claim 4, wherein, The rear-plate stator (23) includes a rear-end cover annular housing (231), and the heat dissipation base plate of the integrated controller (24) is directly mounted on the rear-end cover annular housing (231). A second wound stator core (232) is installed inside the rear-end cover annular housing (231). A rear stator mounting groove is formed on the left end face of the rear-end cover annular housing (231). The second wound stator core (232) is installed in the rear stator mounting groove. A rear-plate stator shielding cover plate (233) is installed on the end face of the groove of the rear stator mounting groove. The rear-plate stator lead (2324) of the second wound stator core (232) passes through the rear-end cover annular housing (231) and is electrically connected to the corresponding AC output terminal of the integrated controller (24).

6. The low-harmonic, low-noise, high-efficiency, and high-reliability permanent magnet shielded pump as described in claim 5, characterized in that, The second winding stator core (232), the rear stator mounting groove and the rear disc stator shielding cover (233) are filled with thermally conductive sealant (8) to form an integrated waterproof disc stator.

7. The low-harmonic, low-noise, high-efficiency, and high-reliability permanent magnet shielded pump as described in claim 5, characterized in that, Each of the second winding stator cores (232) includes 12 rear disc toothed cores (2321) and 1 rear disc yoke core (2322). The rear disc toothed cores (2321) are mounted on the rear disc yoke core (2322), and a rear disc stator winding coil (2323) is wound on each of the rear disc toothed cores (2321). The rear disc stator winding coil (2323) is first mounted on the rear disc toothed cores (2321), and then the rear disc toothed cores (2321) are welded and fixed to the rear disc yoke core. A second wound stator core (232) is formed on the disc yoke core (2322); the rear disc yoke core (2322) is provided with welding holes, and after the rear disc toothed core (2321) is installed on the rear disc yoke core (2322), the welding holes are fully welded to connect the rear disc toothed core (2321) and the rear disc yoke core (2322); the silicon steel magnetic direction of the rear disc toothed core (2321) forms an angle with the axial magnetic field direction of the axial magnetic field rotor (22), and the angle is 20°; The rear end cover type annular housing (231) has a rear end cover mounting hole (234) in the middle, and a rear silicon carbide bearing (235) is installed in the rear end cover mounting hole (234); a rear retaining ring (236) is installed in the rear end cover mounting hole (234), and the rear retaining ring (236) limits the installation of the rear silicon carbide bearing (235) in the rear end cover mounting hole (234).

8. The low-harmonic, low-noise, high-efficiency, and high-reliability permanent magnet shielded pump as described in claim 7, characterized in that, The axial magnetic field rotor (22) includes a shaft (221), with a front ceramic layer (222) and a rear ceramic layer (223) formed by thermal spraying ceramic layers on the front and rear middle parts of the shaft (221); the front ceramic layer (222) is fitted with a front silicon carbide bearing (216), and the rear ceramic layer (223) is fitted with a rear silicon carbide bearing (235); an impeller (224) is installed on one side of the shaft (221), and the impeller (224) is located in the impeller receiving cavity (11); an impeller locking nut (225) is threaded to the side of the shaft (221), and the impeller locking nut (225) locks the impeller (224) onto the shaft (221); a ceramic ball bearing (226) is installed on the other side of the shaft (221), and a bearing pressure ring (227) is installed on the other side of the shaft (221). A coreless magnetic steel rotor (228) is installed on the rotating shaft (221), and the coreless magnetic steel rotor (228) is located within a preset interval between the first wound stator core (213) and the second wound stator core (232).

9. The low-harmonic, low-noise, high-efficiency, and high-reliability permanent magnet shielded pump as described in claim 8, characterized in that, The coreless magnet rotor (228) includes a magnet fixing plate (2281), with a fixing plate mounting hole in the middle of the magnet fixing plate (2281), which is connected to the rotating shaft (221); eight magnet mounting slots are provided on the magnet fixing plate (2281), and the eight magnet mounting slots are arranged in a ring array with the fixing plate mounting hole as the center; an axial magnetic field magnet (2282) is installed in the magnet mounting slot; waterproof insulating varnish (2283) is poured into both end faces of the axial magnetic field magnet (2282) to form an integrated waterproof disc-type axial coreless magnet rotor.

10. The low-harmonic, low-noise, high-efficiency, and high-reliability permanent magnet shielded pump as described in claim 9, characterized in that, There is a 0.5mm preset gap between the front surface of the axial magnetic field magnet (2282) and the front surface of the magnet fixing plate (2281), and there is a 0.5mm preset gap between the rear surface of the axial magnetic field magnet (2282) and the rear surface of the magnet fixing plate (2281).

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