Low-harmonic low-noise high-efficiency high-reliability axial magnetic field permanent magnet shielding pump

Abstract

The invention belongs to the field of shield pumps, and relates to a low-harmonic low-noise high-efficiency high-reliability axial magnetic field permanent magnet shield pump which comprises a pump body. The pump body is provided with an impeller accommodating cavity, a liquid inlet and a liquid outlet are formed in the pump body, and the liquid inlet and the liquid outlet are respectively communicated with the impeller accommodating cavity; the power unit is mounted on the pump body; the power unit comprises a front disc type stator, an axial magnetic field rotor, a rear disc type stator, an impeller and an integrated controller, the front disc type stator is installed on the pump body, and the rear disc type stator is installed on the front disc type stator; the axial magnetic field rotor is arranged between the front disc type stator and the rear disc type stator; the integrated controller is installed on the rear disc type stator. After the structure is adopted, the motor has the beneficial effects that the structure is more compact, the efficiency is higher, the noise is lower, the cooling and heat dissipation are better, the main materials are more saved, the cost is lower, the maintenance is convenient, and the motor can be widely applied to more fields.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of shielded pumps, and in particular relates to a low-harmonic, low-noise, high-efficiency, and high-reliability axial magnetic field permanent magnet shielded pump. BACKGROUND

[0002] Traditional permanent magnet shielded water pumps, also known as shielded pumps, are a type of sealless pump that combines the functions of a motor and a pump, transmitting power through magnetic coupling to achieve a shaft seal-free design, thereby avoiding the leakage problems that may be caused by traditional mechanical seals.

[0003] However, traditional permanent magnet shielded water pumps have the following main disadvantages: 1. High cost: Due to structural and material requirements, the cost of a shielded pump is usually higher than that of a traditional pump, especially when high-temperature or high-pressure media need to be handled. 2. Difficult to repair: Once a shielded pump fails, it usually needs to be disassembled for professional repair, as the internal structure is complex and it is very difficult for users to repair it themselves. 3. Bearing lubrication problem: The bearing relies on the medium for lubrication, and if the medium has too many impurities or does not meet the required properties, it may affect the service life of the bearing. 4. Power limitation: In high-power applications, the limitations of magnetic coupling may result in limited power output.

[0004] Traditional axial flux machines have a series of unique advantages and disadvantages, mainly reflected in their structural design, performance, and application scenarios. However, traditional axial flux machines have the following disadvantages: 1. Cost problem: The manufacturing cost of axial flux machines is usually higher than that of traditional radial flux machines, mainly because they require special materials and manufacturing processes. For example, the use of non-magnetic yoke topology and special stator and rotor designs will increase the cost. 2. Complexity of design and production: The design and production of axial flux machines are usually complex, requiring uniformity of the air gap between the rotor and the stator, which may be difficult to achieve in practice. In addition, the manufacturing process and mechanical equipment are not as mature as radial machines, limiting the ability to scale production. 3. Heat dissipation problem: The windings of axial flux machines are located deep in the stator and between the two rotor discs, making it prone to overheating when running under high load, which affects the performance and life of the motor. SUMMARY

[0005] To solve the above problems of the prior art, the present application provides a low-harmonic, low-noise, high-efficiency, and high-reliability axial magnetic field permanent magnet shielded pump.

[0006] To achieve the above-mentioned purpose, the present application adopts the following technical solutions: As an aspect of the present application, a low-harmonic, low-noise, high-efficiency and high-reliability axial magnetic field permanent magnet shielding pump is provided, which comprises a pump body; the pump body has an impeller accommodating cavity, and the pump body is provided with an inlet and an outlet, which are respectively connected with the impeller accommodating cavity; a power unit comprising a front disc type stator, an axial magnetic field rotor, a rear disc type stator, an impeller and an integrated controller, the axial magnetic field rotor is installed on the front disc type stator, and the impeller is connected with the axial magnetic field rotor; the front disc type stator is installed on the pump body, and the rear disc type stator is installed on the front disc type stator; the axial magnetic field rotor is installed between the front disc type stator and the rear disc type stator; the integrated controller is installed on the rear disc type stator, and the front disc type stator and the rear disc type stator are respectively connected with the corresponding AC output terminals of the integrated controller; the DC power supply line and the controller signal line of the integrated controller extend to the outside of the integrated controller to form the power unit; and the power unit is installed on the pump body.

[0007] Further, the front disc type stator comprises a front end cover type annular casing, a first wound stator core is installed in the front end cover type annular casing, a front stator mounting groove is formed on the right end face of the front end cover type annular casing, the first wound stator core is installed in the front stator mounting groove, a front disc stator shielding cover plate is installed on the slot opening end face of the front stator mounting groove, and the front disc type stator lead of the first wound stator core passes through the front disc stator shielding cover plate and is electrically connected with the corresponding AC output terminal of the integrated controller.

[0008] Further, the first wound stator core, the front stator mounting groove and the front disc stator shielding cover plate are filled with heat-conducting sealing glue to form an integrated waterproof disc type stator.

[0009] Further, each of the first wound stator cores comprises 12 front disc type tooth cores and 1 front disc type yoke core, the front disc type tooth cores are installed on the front disc type yoke core, and a front disc stator winding coil is wound on each of the front disc type tooth cores; the front disc stator winding coil is first installed on the front disc type tooth core, and then the front disc type tooth core is welded and fixed on the front disc type yoke core to form the first wound stator core; a welding hole is formed on the front disc type yoke core, and after the front disc type tooth core is installed on the front disc type yoke core, the welding hole is fully welded to connect the front disc type tooth core and the front disc type yoke core; an included angle is formed between the silicon steel magnetic direction of the front disc type tooth core and the axial magnetic field direction of the axial magnetic field rotor, and the included angle is 20°; A front end cover mounting hole is formed in the middle of the front end cover type annular casing, and a front silicon carbide bearing is installed in the front end cover mounting hole; a front check ring is installed in the front end cover mounting hole, and the front check ring limits the installation of the front silicon carbide bearing in the front end cover mounting hole.

[0010] Further, the rear disc type stator comprises a rear end cover type annular casing, and a heat dissipation bottom plate of the integrated controller is directly assembled on the rear end cover type annular casing; a second wound stator core is installed in the rear end cover type annular casing, a rear stator mounting groove is formed on a left end face of the rear end cover type annular casing, the second wound stator core is installed in the rear stator mounting groove, a rear disc stator shielding cover plate is installed on a groove end face of the rear stator mounting groove, and rear disc stator lead wires of the second wound stator core pass through the rear end cover type annular casing and are electrically connected with corresponding alternating current output terminals of the integrated controller.

[0011] Further, the second wound stator core, the rear stator mounting groove and the rear disc stator shielding cover plate are filled with heat-conducting sealing glue to form an integrated waterproof disc type stator.

[0012] Further, each of the second wound stator cores comprises 12 rear disc type tooth cores and one rear disc type yoke core, the rear disc type tooth cores are installed on the rear disc type yoke core, and rear disc stator winding coils are wound on each of the rear disc type tooth cores; the rear disc stator winding coils are first installed on the rear disc type tooth cores, and then the rear disc type tooth cores are welded and fixed on the rear disc type yoke core to form the second wound stator core; the rear disc type yoke core is provided with a welding hole, after the rear disc type tooth cores are installed on the rear disc type yoke core, the welding hole is fully welded to connect the rear disc type tooth cores and the rear disc type yoke core; a silicon steel magnetic direction of the rear disc type tooth core and an axial magnetic field direction of the axial magnetic field rotor form an included angle, and the included angle is 20°. A rear end cover mounting hole is formed in a middle part of the rear end cover type annular casing, and a rear silicon carbide bearing is installed in the rear end cover mounting hole; a rear check ring is installed in the rear end cover mounting hole, and the rear check ring limits the installation of the rear silicon carbide bearing in the rear end cover mounting hole.

[0013] Further, the axial magnetic field rotor comprises a rotating shaft, the material of the rotating shaft is stainless steel, and a front ceramic layer and a rear ceramic layer are formed by thermal spraying ceramic layers on front and rear middle parts of the rotating shaft; the front ceramic layer cooperates with the front silicon carbide bearing, and the rear ceramic layer cooperates with the rear silicon carbide bearing; a side end of the rotating shaft is installed with an impeller, and the impeller is located in an impeller accommodating cavity; an impeller locking nut is threadedly connected to the side end of the rotating shaft, and the impeller locking nut locks the impeller on the rotating shaft; a ceramic ball bearing is installed on the other side end of the rotating shaft, and a bearing pressing ring is installed on the other side end of the rotating shaft. A coreless magnetic steel rotor is installed on the rotating shaft, and the coreless magnetic steel rotor is located in a preset interval between the first wound stator core and the second wound stator core.

[0014] Further, the coreless magnetic steel rotor comprises a magnetic steel fixing disc, a fixing disc mounting hole is formed in the middle of the magnetic steel fixing disc, and the fixing disc mounting hole is connected with the rotating shaft; eight magnetic steel mounting grooves are formed on the magnetic steel fixing disc, and the eight magnetic steel mounting grooves are arranged in a ring array with the fixing disc mounting hole as the center; an axial magnetic field magnetic steel is mounted in the magnetic steel mounting groove; and the front surface of the axial magnetic field magnetic steel and the front surface of the magnetic steel fixing disc have a 0.5mm preset gap, and the rear surface of the axial magnetic field magnetic steel and the rear surface of the magnetic steel fixing disc have a 0.5mm preset gap.

[0015] Further, the coreless magnetic steel rotor comprises a magnetic steel fixing disc, a fixing disc mounting hole is formed in the middle of the magnetic steel fixing disc, and the fixing disc mounting hole is connected with the rotating shaft; eight magnetic steel mounting grooves are formed on the magnetic steel fixing disc, and the eight magnetic steel mounting grooves are arranged in a ring array with the fixing disc mounting hole as the center; an axial magnetic field magnetic steel is mounted in the magnetic steel mounting groove; and the front surface of the axial magnetic field magnetic steel and the front surface of the magnetic steel fixing disc have a 0.5mm preset gap, and the rear surface of the axial magnetic field magnetic steel and the rear surface of the magnetic steel fixing disc have a 0.5mm preset gap.

[0016] The low-harmonic low-noise high-efficiency high-reliability axial magnetic field permanent magnet shielding pump has the advantages of compact structure, high efficiency, low noise, good cooling and heat dissipation, low cost of main materials, low cost and convenient maintenance, and can be widely applied to more fields, and is more suitable for application occasions with high safety and environmental protection requirements and limited space, such as chemical industry, petroleum industry, pharmaceutical industry and the like. It can show great application potential in many fields. BRIEF DESCRIPTION OF DRAWINGS

[0017] The drawings accompanying the specification of this application serve to provide a further understanding of the application, and the illustrative embodiments of the application and their descriptions serve to explain the application, and do not constitute an improper limitation on the application.

[0018] Figure 1 The drawings accompanying the specification of this application serve to provide a further understanding of the application, and the illustrative embodiments of the application and their descriptions serve to explain the application, and do not constitute an improper limitation on the application. Figure 2 The drawings accompanying the specification of this application serve to provide a further understanding of the application, and the illustrative embodiments of the application and their descriptions serve to explain the application, and do not constitute an improper limitation on the application. Figure 3 The drawings accompanying the specification of this application serve to provide a further understanding of the application, and the illustrative embodiments of the application and their descriptions serve to explain the application, and do not constitute an improper limitation on the application. Figure 4 The drawings accompanying the specification of this application serve to provide a further understanding of the application, and the illustrative embodiments of the application and their descriptions serve to explain the application, and do not constitute an improper limitation on the application. Figure 5 The drawings accompanying the specification of this application serve to provide a further understanding of the application, and the illustrative embodiments of the application and their descriptions serve to explain the application, and do not constitute an improper limitation on the application. Figure 6 The drawings accompanying the specification of this application serve to provide a further understanding of the application, and the illustrative embodiments of the application and their descriptions serve to explain the application, and do not constitute an improper limitation on the application. Figure 7 The drawings accompanying the specification of this application serve to provide a further understanding of the application, and the illustrative embodiments of the application and their descriptions serve to explain the application, and do not constitute an improper limitation on the application. Figure 8 The drawings accompanying the specification of this application serve to provide a further understanding of the application, and the illustrative embodiments of the application and their descriptions serve to explain the application, and do not constitute an improper limitation on the application. Figure 9 The drawings accompanying the specification of this application serve to provide a further understanding of the application, and the illustrative embodiments of the application and their descriptions serve to explain the application, and do not constitute an improper limitation on the application. Figure 10 The drawings accompanying the specification of this application serve to provide a further understanding of the application, and the illustrative embodiments of the application and their descriptions serve to explain the application, and do not constitute an improper limitation on the application. Figure 11 This is a right side view of the structure of the front disc type gear core of the present invention; Figure 12 This is a left side view of the structure of the front disc type gear core of the present invention; Figure 13 It is a schematic structural diagram of the axial magnetic field rotor of the present invention; Figure 14 A cross-sectional view of the structure of the magnetic steel fixing disk of the present invention; Figure 15 It is a structural side view of the magnetic steel fixing plate of the present invention. DETAILED DESCRIPTION

[0019] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in conjunction with specific embodiments of the present invention and corresponding drawings. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0020] An embodiment of the present application provides a low harmonic, low noise, high efficiency, high reliability axial magnetic field permanent magnet canned pump, such as Figure 1 As shown, it comprises: a pump body 1, which is made of stainless steel; the pump body 1 has an impeller accommodating chamber 11, and is provided with a liquid inlet 12 and a liquid outlet 13, the liquid inlet 12 and the liquid outlet 13 being respectively connected to the impeller accommodating chamber 11; the medium enters from the liquid inlet 12, passes through the impeller accommodating chamber 11, and flows out from the liquid outlet 13; 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 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 respectively; the DC power line 241 and the controller signal line 242 of the integrated controller 24 are extended to the outside of the integrated controller 24 to be assembled into a power unit 2; the power unit 2 is installed on the pump body 1; it should be noted that the integrated controller 24 is an 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 are extended to the outside of the integrated controller 24 to facilitate wiring.

[0021] In an embodiment, as shown in Figures 2-4 and Figures 10-12 The front disc stator 21 comprises a front end cover type annular casing 212, in which a first wound stator core 213 is installed, and a front stator mounting groove is formed on the right end face of the front end cover type annular casing 212, in which the first wound stator core 213 is installed, and a front disc stator shielding cover plate 214 is installed on the slot end face of the front stator mounting groove, and the front disc stator lead 215 of the first wound stator core 213 is electrically connected to the corresponding AC output terminal of the integrated controller 24 through the front disc stator shielding cover plate 214; it should be noted that the front disc stator shielding cover plate 214 is provided with a through hole 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; As an example, the first wound stator core 213, the front stator mounting groove and the front disc stator shielding cover plate 214 are filled with heat-conducting sealant 8 to form an integrated waterproof disc stator; Each of the first wound stator core 213 comprises 12 front disc tooth cores 2131 and 1 front disc yoke core 2132, the front disc tooth core 2131 is installed on the front disc yoke core 2132, and the front disc stator winding coil 2133 is wound on each of the front disc tooth core 2131; in order to facilitate assembly, the front disc stator winding coil 2133 is first installed on the front disc tooth core 2131, and then the front disc tooth core 2131 is welded and fixed on the front disc yoke core 2132 to form the first wound stator core 213; the front disc yoke core 2132 is provided with a welding hole, and after the front disc tooth core 2131 is installed on the front disc yoke core 2132, the welding hole is fully welded to make the front disc tooth core 2131 and the front disc yoke core 2132 more reliable; it should be noted that the structure of the front disc tooth core 2131, the front disc yoke core 2132 and the front disc stator winding coil 2133 is known in the art, which will not be described here; The middle part of the front end cover type annular casing 212 is provided with a front end cover mounting hole 218, in which a front silicon carbide bearing 216 is installed; the front end cover mounting hole 218 is provided with a front retaining ring 217, which limits the installation of the front silicon carbide bearing 216 in the front end cover mounting hole 218.

[0022] In an embodiment, as shown in Figures 5-7As shown, the rear disc type stator 23 comprises a rear end cover type annular casing 231, and a heat dissipation bottom plate of the integrated controller 24 is directly assembled on the rear end cover type annular casing 231; a second winding stator core 232 is installed in the rear end cover type annular casing 231, a rear stator mounting groove is formed on a left end face of the rear end cover type annular casing 231, the second winding stator core 232 is installed in the rear stator mounting groove, a rear disc stator shielding cover plate 233 is installed on a slot end face of the rear stator mounting groove, and rear disc stator lead wires 234 of the second winding stator core 232 are electrically connected with corresponding AC output terminals of the integrated controller 24 through the rear end cover type annular casing 231; it should be noted that a through hole is formed on the rear end cover type annular casing 231 for the rear disc stator lead wires 234 to pass through; the rear disc stator lead wires 234 are made of heat shrinkable Teflon material to achieve waterproof shielding performance; The second winding stator core 232, the rear stator mounting groove and the rear disc stator shielding cover plate 233 are filled with heat-conducting sealing glue 8 to form an integrated waterproof disc type stator; Each of the second winding stator cores 232 comprises 12 rear disc type tooth cores 2321 and one rear disc type yoke core 2322, the rear disc type tooth cores 2321 are installed on the rear disc type yoke core 2322, and rear disc stator winding coils 2323 are wound on each of the rear disc type tooth cores 2321; in order to facilitate assembly, the rear disc stator winding coils 2323 are first installed on the rear disc type tooth cores 2321, and then the rear disc type tooth cores 2321 are welded and fixed on the rear disc type yoke core 2322 to form the second winding stator core 232; a welding hole is formed on the rear disc type yoke core 2322, and after the rear disc type tooth cores 2321 are installed on the rear disc type yoke core 2322, the welding hole is fully welded to make the rear disc type tooth cores 2321 and the rear disc type yoke core 2322 more reliably connected; it should be noted that the structures of the rear disc type tooth cores 2321, the rear disc type yoke core 2322 and the rear disc stator winding coils 2323 are all known prior art, and will not be described here; A rear end cover mounting hole 234 is formed in the middle of the rear end cover type annular casing 231, and a rear silicon carbide bearing 235 is installed in the rear end cover mounting hole 234; a rear check ring 236 is installed in the rear end cover mounting hole 234, and the rear check ring 236 limits the installation of the rear silicon carbide bearing 235 in the rear end cover mounting hole 234.

[0023] In this embodiment, as shown in Figure 8 An angle is formed between a silicon steel magnetic conducting direction of the front disc type tooth core 2131 and an axial magnetic field direction of the axial magnetic field rotor 22, and the angle is 20°; The silicon steel magnetic conducting direction of the rear disc type tooth core 2321 forms an angle with the axial magnetic field direction of the axial magnetic field rotor 22, and the angle is 20°. It should be noted that the front disc type tooth core 2131 and the rear disc type tooth core 2321 are both formed by stacking a plurality of stator tooth core silicon steel punching sheets, which is a known technology and will not be described here. When winding, the winding surface of the front disc type tooth core 2131 and the rear disc type tooth core 2321 is injected with an insulating layer 36, as shown in Figure 9 The above design is equivalent to a stator skew slot, which can effectively weaken the tooth harmonic magnetic motive force, and has relatively small influence on the fundamental magnetic motive force, thereby greatly reducing electromagnetic noise and vibration. In addition, within the 20° skew slot angle range, the distribution of magnetic flux in the stator core is improved, hysteresis and eddy current loss are reduced, the iron loss is greatly reduced, and the overall efficiency of the permanent magnet shielding motor can be increased by 0.5%-1%. Traditional skew slots increase the linear length of the coil, increase the resistance, increase the copper loss, and reduce the efficiency. In the embodiment, the magnetic field direction and the magnetic conducting direction of the oriented silicon steel core form an angle, and the core tooth is not skewed, so the diameter direction of the winding is not increased, the winding resistance is unchanged, the motor copper loss is not increased, and high efficiency is maintained.

[0024] In an embodiment, as shown in Figure 13 The front ceramic layer 222 cooperates with the front silicon carbide bearing 216, and the rear ceramic layer 223 cooperates with the rear silicon carbide bearing 235. One side end of the rotating shaft 221 is provided with an impeller 224, and the impeller 224 is located in an impeller accommodating cavity 11. The material of the impeller 224 is stainless steel. The side end of the rotating shaft 221 is threadedly connected with an impeller locking nut 225, and the impeller locking nut 225 locks the impeller 224 on the rotating shaft 221. The other side end of the rotating shaft 221 is provided with a ceramic ball bearing 226, and the other side end of the rotating shaft 221 is provided with a bearing pressing ring 227 for limiting the ceramic ball bearing 226. The stainless steel shaft is provided with a ceramic layer on the bearing position, which effectively prevents and eliminates the problems of short service life and easy wear of the water bearing and fragmentation of the ceramic shaft under medium overload impact.

[0025] The rotating shaft 221 is provided with a coreless magnetic steel rotor 228, and the coreless magnetic steel rotor 228 is located in a preset interval between the first winding stator core 213 and the second winding stator core 232.

[0026] In an embodiment, as shown in Figures 13-15 ​As shown, the coreless magnetic steel rotor 228 comprises a magnetic steel fixing disc 2281, a fixing disc mounting hole is formed in the middle of the magnetic steel fixing disc 2281, and the fixing disc mounting hole is connected with the rotating shaft 221; eight magnetic steel mounting grooves are formed on the magnetic steel fixing disc 2281, and the eight magnetic steel mounting grooves are arranged in a ring array with the fixing disc mounting hole as the center; an axial magnetic field magnetic steel 2282 is mounted in the magnetic steel mounting groove; waterproof insulating paint 2283 is filled into the both side end faces of the axial magnetic field magnetic steel 2282 to form an integrated waterproof disc type axial coreless magnetic steel rotor; there is a 0.5mm preset gap between the front surface of the axial magnetic field magnetic steel 2282 and the front surface of the magnetic steel fixing disc 2281, and there is a 0.5mm preset gap between the rear surface of the axial magnetic field magnetic steel 2282 and the rear surface of the magnetic steel fixing disc 2281, which serves as a glue storage space; the axial magnetic field magnetic steel 2282 is integrally formed with the magnetic steel fixing disc 2281 by injection molding, achieving the function of corrosion protection and shielding; the fixing disc mounting hole of the magnetic steel fixing disc 2281 is interference-fitted on the rotating shaft 221.

[0027] Further, as shown in Figure 1 The pump body 1 is provided with a first mounting hole, the front disc type stator 21 is provided with a first front mounting hole corresponding to the first mounting hole, and the first mounting hole and the first front mounting hole are connected through a pump body locking bolt 3 and a pump body locking nut 4.

[0028] Further, as shown in Figure 1 The cavity mouth end of the impeller containing cavity 11 of the pump body 1 is formed with a mounting recess, the front end cover type annular casing 212 of the front disc type stator 21 is formed with a connecting convex part 211 matched with the mounting recess, so that the installation is more convenient; the pump body 1 and the front disc type stator 21 are installed with a pump body sealing ring 5.

[0029] Further, as shown in Figure 1 The front disc type stator 21 is provided with a second front mounting hole, the rear disc type stator 23 is provided with a first rear mounting hole corresponding to the second front mounting hole, and the second front mounting hole and the first rear mounting hole are connected through a stator locking bolt 6; the front disc type stator 21 and the rear disc type stator 23 are installed with a disc type stator sealing ring 7.

[0030] In this embodiment, an axial magnetic field rotor 22 is arranged between the front disc stator 21 and the rear disc stator 23. The front disc stator 21 and the rear disc stator 23 are respectively provided with 12 tooth cores, each of which is embedded with a winding coil and fixed on a yoke core to form a winding stator core. The winding stator core is fixed in an end cover type annular casing. A stator shielding cover plate is installed on the slot opening end face of the stator mounting groove, and a heat conducting sealing glue is filled to form an integrated waterproof disc stator. The front disc stator 21 and the rear disc stator 23 are respectively provided with silicon carbide bearings. The front disc stator 21 and the rear disc stator 23 are connected with the axial magnetic field rotor 22 through the corresponding silicon carbide bearings to generate a permanent magnetic field, thereby realizing the rotation output torque of the rotor. A full ceramic ceramic ball bearing 226 is arranged at the rear end of the rear disc stator 23. The inner ring of the ceramic ball bearing 226 is fixed on the rotating shaft 221 by a bearing pressing ring 227, thereby realizing the axial positioning of the front disc stator 21, the rear disc stator 23 and the axial magnetic field rotor 22 and ensuring the uniformity of the 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 on the front end of the rotating shaft through a locking nut. The pump body is connected with the front disc stator through fastening screws and nuts. The integrated controller is assembled at the rear end of the rear disc stator. The lead-out wires of the front disc stator 21 and the rear disc stator 23 are directly connected with the alternating current output terminals of the integrated controller.

[0031] The assembly sequence of the embodiment is as follows: Firstly, the front disc stator 21 of the power unit 2 is assembled. The front end cover mounting hole 218 is provided with a front silicon carbide bearing 216. The front end cover mounting hole 218 is provided with a front retainer ring 217, which limits the installation of the front silicon carbide bearing 216 in the front end cover mounting hole 218. The axial magnetic field rotor 22 is inserted into the front silicon carbide bearing 216 of the front disc stator 21. The front ceramic layer 222 cooperates with the front silicon carbide bearing 216. Then, the rear disc stator 23 is installed. The rear ceramic layer 223 cooperates with the rear silicon carbide bearing 235. In this way, the assembly of the power unit is completed. Secondly, the impeller 224 is located in the impeller accommodating cavity 11. The impeller locking nut 225 locks the impeller 224 on the rotating shaft 221. After the impeller is assembled, the pump body 1 is assembled on the power unit 2. Thirdly, the integrated controller 24 is assembled. The integrated controller 24 is installed on the rear disc stator 23. The front disc stator 21 and the rear disc stator 23 are respectively electrically connected with the corresponding alternating current output terminals of the integrated controller 24. The direct current power supply line 241 and the controller signal line 242 of the integrated controller 24 extend to the outside of the integrated controller 24.

[0032] In the embodiment, the integrated controller is assembled on the rear end bottom plate of the rear disc type stator, that is, the heat dissipation bottom plate of the controller power device is directly assembled on the rear end cover type annular casing, the outer surfaces of the front disc type stator and the rear disc type stator, the tooth disc surfaces of the cores, the inner surfaces and the outer surfaces of the axial magnetic field rotors and the bottom surfaces of the main boards of the integrated controllers are directly contacted with the working medium, the working medium can directly cool the three annular inner surfaces of the front disc type stator and the rear disc type stator, the outer surfaces of the rotors and the mounting bottom surfaces of the integrated controllers, the cooling is more sufficient and direct, the temperature rise of the whole machine is lower, the loss is smaller, the system life is longer, the whole machine is more reliable, so that the shielding pump system efficiency is higher, and the heat dissipation difficulty problem of the traditional axial magnetic field motor, that is, the structure of two axial magnetic field rotors and one axial magnetic field stator in the middle, is overcome. The temperature rise of the motor is greatly reduced, at the same time, the efficiency of the motor is improved, the amount of material is more saved, and the cost is lower.

[0033] In the embodiment, the silicon carbide bearing and the ceramic layer of the thermal spraying of the stainless steel shaft are combined to form a high wear-resistant long-life high-reliability bearing combination, which is more reliable than the traditional plastic water bearing and ceramic shaft, has lower cost, is convenient to assemble and maintain.

[0034] In addition, it should be noted that the terms "first", "second", etc. are used to limit the parts, and are only used to facilitate the differentiation of the corresponding parts. If there is no further declaration, the above terms have no special meaning, and therefore cannot be understood as a limitation on the scope of protection of the present application.

[0035] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "provided with", "connected" and the like should be understood in a broad sense, for example, "connected" can be fixedly connected, can be detachably connected, or integrally connected; can be mechanically connected, can be electrically connected; can be directly connected, can be indirectly connected through an intermediate medium, or can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0036] The above is only the preferred embodiment of the present application, and any changes and modifications made within the scope of the patent application of the present application shall be included in the scope of the present application.

Claims

1. A low harmonic, low noise, high efficiency and high reliability axial magnetic field permanent magnet canned pump, characterized in that: It comprises: a pump body (1); the pump body (1) has an impeller accommodating chamber (11); the pump body (1) is provided with a liquid inlet (12) and a liquid outlet (13); the liquid inlet (12) and the liquid outlet (13) are respectively connected to the impeller accommodating chamber (11); A power unit (2), the power unit (2) comprising 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) being mounted on the front disc stator (21), the impeller (224) being connected to the axial magnetic field rotor (22); the front disc stator (21) being mounted on the pump body (1), the rear disc stator (23) being mounted on the front disc stator (21); the axial magnetic field rotor (22) being mounted on the pump body (1); 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); 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) are extended to the outside of the integrated controller (24) to be assembled into a power unit (2); the power unit (2) is installed on the pump body (1).

2. The low harmonic, low noise, high efficiency and high reliability axial magnetic field permanent magnet canned pump according to claim 1, characterized in that: The front disc stator (21) includes a front cover annular housing (212), a first winding stator core (213) is installed in the front cover annular housing (212), a front stator mounting slot is formed on the right end face of the front cover annular housing (212), the first winding stator core (213) is installed in the front stator mounting slot, a front disc stator shielding cover (214) is installed on the slot end face of the front stator mounting slot, and a front disc stator lead (215) of the first winding stator core (213) passes through the front disc stator shielding cover (214) and is electrically connected to an AC output terminal corresponding to the integrated controller (24).

3. The low harmonic, low noise, high efficiency and high reliability axial magnetic field permanent magnet canned pump according to claim 2, characterized in that: A thermally conductive sealant (8) is filled between the first winding stator core (213), the front stator mounting slot and the front disc stator shielding cover (214) to form an integrated waterproof disc stator.

4. The low harmonic, low noise, high efficiency and high reliability axial magnetic field permanent magnet canned pump according to claim 2, characterized in that: Each of the first stator cores (213) with windings comprises 12 front disc tooth cores (2131) and one front disc yoke core (2132). The front disc tooth cores (2131) are mounted on the front disc yoke core (2132). A front disc stator winding coil (2133) is wound on each of the front disc tooth cores (2131). The front disc stator winding coil (2133) is first mounted on the front disc tooth core (2131), and then the front disc tooth core (2131) is welded and fixed to the front disc tooth core (2131). A first stator core (213) with a winding is formed on the disc yoke core (2132); a welding hole is provided on the front disc yoke core (2132); after the front disc tooth core (2131) is mounted on the front disc yoke core (2132), the welding hole is fully welded, so that the front disc tooth core (2131) and the front disc yoke core (2132) are connected; an angle is formed between the magnetic conductivity direction of the silicon steel of the front disc tooth core (2131) and the axial magnetic field direction of the axial magnetic field rotor (22), and the angle is 20°; A front cover mounting hole (218) is provided in the middle of the front cover annular housing (212), 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) and installs it in the front cover mounting hole (218).

5. The low harmonic, low noise, high efficiency and high reliability axial magnetic field permanent magnet canned pump according to claim 4, characterized in that: 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 assembled on the rear end cover annular housing (231); a second winding stator core (232) is installed in 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 winding stator core (232) is installed in the rear stator mounting groove, and a rear disc stator shielding cover (233) is installed on the notch end face of the rear stator mounting groove, and a rear disc stator lead (234) of the second winding 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 axial magnetic field permanent magnet canned pump according to claim 5, characterized in that: A thermally conductive sealant (8) is filled between the second winding stator core (232), the rear stator mounting slot and the rear disc stator shielding cover (233) to form an integrated waterproof disc stator.

7. The low harmonic, low noise, high efficiency and high reliability axial magnetic field permanent magnet canned pump according to claim 5, characterized in that: Each of the second stator cores (232) with windings comprises 12 rear disc tooth cores (2321) and one rear disc yoke core (2322), wherein the rear disc tooth 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 tooth cores (2321); the rear disc stator winding coil (2323) is first mounted on the rear disc tooth core (2321), and then the rear disc tooth core (2321) is welded and fixed to the rear disc tooth core (2321). A second stator core (232) with a winding is formed on the disc yoke core (2322); a welding hole is provided on the rear disc yoke core (2322); after the rear disc tooth core (2321) is mounted on the rear disc yoke core (2322), the welding hole is fully welded, so that the rear disc tooth core (2321) and the rear disc yoke core (2322) are connected; an angle is formed between the magnetic conductivity direction of the silicon steel of the rear disc tooth core (2321) and the axial magnetic field direction of the axial magnetic field rotor (22), and the angle is 20°; A rear cover mounting hole (234) is provided in the middle of the rear cover annular housing (231), and a rear silicon carbide bearing (235) is mounted in the rear cover mounting hole (234); a rear retaining ring (236) is mounted in the rear cover mounting hole (234), and the rear retaining ring (236) limits the rear silicon carbide bearing (235) and mounts it in the rear cover mounting hole (234).

8. The low harmonic, low noise, high efficiency and high reliability axial magnetic field permanent magnet canned pump according to claim 7, characterized in that: The axial magnetic field rotor (22) includes a rotating shaft (221), and a front ceramic layer (222) and a rear ceramic layer (223) are uniformly sprayed on the front middle and rear middle parts of the rotating shaft (221); the front ceramic layer (222) cooperates with the front silicon carbide bearing (216), and the rear ceramic layer (223) cooperates with the rear silicon carbide bearing (235); an impeller (224) is installed on one side end of the rotating shaft (221), and the impeller (224) is located in the impeller accommodating cavity (11); the side end of the rotating shaft (221) is threadedly connected to an impeller locking nut (225), and the impeller locking nut (225) locks the impeller (224) on the rotating shaft (221); a ceramic ball bearing (226) is installed on the other side end of the rotating shaft (221), and a bearing pressure ring (227) is installed on the other side end of the rotating shaft (221); A coreless magnetic steel rotor (228) is mounted on the rotating shaft (221), and the coreless magnetic steel rotor (228) is located within a preset interval between the first stator core with windings (213) and the second stator core with windings (232).

9. The low harmonic, low noise, high efficiency and high reliability axial magnetic field permanent magnet canned pump according to claim 8, characterized in that: The coreless magnetic steel rotor (228) comprises a magnetic steel fixing disk (2281), a fixing disk mounting hole is provided in the middle of the magnetic steel fixing disk (2281), and the fixing disk mounting hole is connected to the rotating shaft (221); 8 magnetic steel mounting grooves are provided on the magnetic steel fixing disk (2281), and the 8 magnetic steel mounting grooves are arranged in a circular array with the fixing disk mounting hole as the center; axial magnetic field magnetic steel (2282) is installed in the magnetic steel mounting groove; waterproof insulating paint (2283) is poured into the end surfaces of both sides of the axial magnetic field magnetic steel (2282) to form an integrated waterproof disc-type axial coreless magnetic steel rotor.

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

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