A magnetic levitation multi-stage differential shaftless water pump

Abstract

The present invention discloses a magnetic levitation multi-stage differential speed shaftless water pump, which comprises a housing, a driving stator assembly and a magnetic levitation stator installed in the housing, and a rotor assembly. The driving stator assembly includes at least two driving stators distributed along the axial direction of the housing. The rotor assembly includes a magnetic levitation permanent magnet and a multi-stage impeller module. The rotor assembly is in a magnetic levitation state through the cooperation of the magnetic levitation stator and the magnetic levitation permanent magnet. Each stage of the multi-stage impeller module includes a rotor and an impeller assembly installed on the rotor. Each driving stator provides a driving force for the rotation of the rotor of the corresponding stage of the impeller module. By setting different voltages for different driving stators, the rotation speed of the corresponding rotor is controlled, and the differential rotation of the multi-stage impeller module is realized. The present invention not only realizes multi-stage pressurized transmission and reduces fluid resistance, improving the head of the pump; but also the change in the rotation speed between the multi-stage impellers significantly reduces the noise caused by fluid pressure change.

Description

Technical Field

[0001] The present invention belongs to the technical field of water pumps, and specifically relates to a magnetic levitation multi-stage differential speed shaftless water pump, which can be widely used for water transportation and can be used in the water conservancy industry, hydropower industry, sewage treatment industry, etc. Background Art

[0002] A water pump is a machine that transports liquids or increases the pressure of liquids. It transfers the mechanical energy of the prime mover or other external energy to the liquid, increasing the energy of the liquid. It is mainly used to transport liquids including water, oil, acid-base solutions, emulsions, suspension emulsions, and liquid metals, etc. It is the most common industrial equipment in modern industrial production and plays an important role in almost all fields of modern industry.

[0003] Water pumps are divided into positive displacement pumps and vane pumps. Vane pumps include centrifugal pumps, axial flow pumps, mixed flow pumps, etc. Structurally, they all have impellers and pump shafts. The pump shaft is driven by the output shaft of the motor, and then the impeller rotates to achieve the function of the water pump. Due to the high-speed operation of the impeller and pump shaft, various disadvantages of traditional water pumps have emerged: such as low conversion efficiency, high power consumption, limited head, easy wear of bearings, frequent maintenance, and huge noise. Developing a shaftless water pump is expected to solve these problems and achieve the effects of high efficiency, energy conservation, durability, and environmental protection. Patent CN205225763U discloses a shaftless pump, which combines a fixed pipe and a rotating pipe, and at the same time uses two sets of bearing supports to rotate and cooperate with the rotating pipe. The positioning bearings are arranged in the correspondingly matched grooves to limit the displacement of the pipe and make the water pump operate more stably. Patent CN1138919C discloses a shaftless sealed rotor series pipeline pump. It includes a hollow housing, an annular rotor rotatably installed in the housing, and an annular stator fixedly installed in the housing and surrounding the rotor. Patent CN102619788A discloses an integrated shaftless motor axial flow pump. The pump is provided with a pump housing with connecting flanges at both ends. A pump impeller is centered in the internal cavity of the pump housing. A guide vane is arranged in the internal cavity of the pump housing on the downstream side of the axial flow pump. A rotor fixing ring is arranged on the outer edge of the pump impeller. The driving motor rotor is assembled on the rotor fixing ring. The rotor fixing ring is fixed on the inner side of the pump housing through a fixing ring bearing. A groove is arranged at the position corresponding to the driving motor rotor on the inner side of the pump housing, and a driving motor stator is assembled in the groove. Patent CN102055277A discloses a shaftless motor used in conjunction with a mud pump. An installation cavity is arranged inside the rotor of the motor, and a rotor auxiliary iron is sequentially arranged outside. Permanent magnet blocks are evenly distributed on the outer circumferential surface of the rotor auxiliary iron at intervals of N and S levels. A wound stator is arranged outside the permanent magnet blocks. A machine housing is installed outside the stator. Inner end covers and outer end covers are respectively fixedly connected to both ends of the machine housing. The inner end cover is fixed on the equipment by relying on the equipment stop. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a magnetic levitation multi-stage differential shaftless water pump, which can further reduce noise, reduce volume and improve efficiency.

[0005] To solve the above technical problem, the present invention adopts the following technical solution: A magnetic levitation multi-stage differential shaftless water pump includes a housing, a driving stator assembly and a magnetic levitation stator installed in the housing, and a rotor assembly. There is a circulating water flow channel communicating front and back between the rotor assembly and the driving stator assembly. The driving stator assembly includes at least two driving stators distributed along the axial direction of the housing. The rotor assembly includes a magnetic levitation permanent magnet and a multi-stage impeller module. The rotor assembly is in a magnetic levitation state through the cooperation of the magnetic levitation stator and the magnetic levitation permanent magnet. Each stage of the multi-stage impeller module includes a rotor and an impeller assembly installed on the rotor. Each driving stator provides a driving force for the rotation of the rotor of the corresponding stage of the impeller module. By setting different voltages for different driving stators, the rotation speed of the corresponding rotor is controlled to achieve differential rotation of the multi-stage impeller module.

[0006] Preferably, the rotor includes a cylindrical steel ring and a plurality of permanent magnet steels evenly distributed along the circumferential direction of the cylindrical steel ring. The impeller assembly includes an impeller and a front cover plate and a variable-diameter fluid guide respectively covering the front and rear sides of the impeller. The front cover plate and the variable-diameter fluid guide are provided with water flow channel holes for water to pass through, and the variable-diameter fluid guide is connected to the cylindrical steel ring.

[0007] Preferably, the cylindrical steel ring and the variable-diameter fluid guide are connected by a bolt structure. An installation groove for the variable-diameter fluid guide is provided inside the cylindrical steel ring. The variable-diameter fluid guide includes a rear cover of the variable-diameter fluid guide. An installation groove for the bolt structure is provided on the outer side of the rear cover of the variable-diameter fluid guide. The bolt structure is fitted in the installation groove for the bolt structure and the installation groove for the variable-diameter fluid guide.

[0008] Preferably, the rotor assembly further includes a self-priming impeller module located in front of the multi-stage impeller module. The self-priming impeller module includes the rotor and the impeller assembly. A self-priming port is provided at the center of the front cover plate of the self-priming impeller module. The impeller of the self-priming impeller module is connected to a self-priming impeller shaft. The self-priming impeller shaft extends forward from the self-priming port and is connected to a self-priming blade. The driving stator assembly further includes a driving stator provided corresponding to the rotor of the self-priming impeller module.

[0009] Preferably, the housing includes a cylindrical body and a front shell connected to the front end of the cylindrical body. The front shell is provided with a water flow channel inlet, and the self-priming blade is arranged at the water flow channel inlet.

[0010] Preferably, a rear-end impeller body is provided at the rear side of the multi-stage impeller module. The rear-end impeller body includes a rear impeller cover and a rear impeller connected together. A plurality of radial through grooves are arranged along the circumferential direction of the rear impeller cover.

[0011] Preferably, a rear shell is connected to the rear end of the cylinder body. The rear shell includes an impeller tray, a diversion cover, and a rear cover that are sequentially connected from front to back. A water flow channel outlet is provided at the center of the rear cover, and a support hole is provided at the center of the impeller tray. The impeller shaft of the rear impeller is supported in the support hole.

[0012] Preferably, the magnetic levitation stator includes a front magnetic levitation stator installed in the front shell and a rear magnetic levitation stator installed in the rear shell. The magnetic levitation permanent magnet includes a front permanent magnet that cooperates with the front magnetic levitation stator and a rear permanent magnet that cooperates with the rear magnetic levitation stator.

[0013] Preferably, the front permanent magnet is installed at the front end of the rotor in the self-priming impeller module, and the rear permanent magnet is installed on the rear impeller.

[0014] Preferably, between the self-priming impeller module and the multi-stage impeller module, between adjacent two stages of the multi-stage impeller module, and between the multi-stage impeller module and the rear impeller body are all rotationally connected through an impeller module connector.

[0015] The technical solution adopted by the present invention has the following beneficial effects:

[0016] The driving stator provides a driving force for the rotation of the rotor under the action of current. By setting different voltages for different driving stators to control the rotation speed of the corresponding rotor, the differential rotation of the multi-stage impeller module is realized, which not only realizes multi-stage pressurized transmission and reduces fluid resistance, but also improves the head of the pump; moreover, the change in the rotation speed between the multi-stage impellers significantly reduces the noise caused by fluid pressure change.

[0017] Through the cooperation of the magnetic levitation stator and the magnetic levitation permanent magnet, the rotor assembly is in a magnetic levitation state during operation, realizing a shaftless design, which makes the pump smaller in size, higher in efficiency, and longer in service life.

[0018] The modular impeller design makes it easy to replace the impeller.

[0019] There is a circulating water flow channel between the rotor and the driving stator, which reduces friction while realizing water flow circulation, thereby reducing noise and energy consumption.

[0020] The specific technical solution and its beneficial effects of the present invention will be described in detail in the following specific embodiments in combination with the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention will be further described below in conjunction with the drawings and specific embodiments:

[0022] Figure 1 FIG. is an overall structure diagram of a magnetic levitation multi-stage differential shaftless water pump provided by the present invention, in which the arrow indicates the flow condition of the fluid passing through the pump during pump operation;

[0023] Figure 2 It is the overall structure development drawing of a magnetic levitation multi-stage differential shaftless water pump provided by the present invention;

[0024] Figure 3 It is the cross-sectional view of the outer shell;

[0025] Figure 4 It is the development drawing of the outer shell;

[0026] Figure 5 It is the cross-sectional view of the rear shell;

[0027] Figure 6 It is the development drawing of the rear shell;

[0028] Figure 7-1 It is the schematic development of the cylinder body Figure 1 ;

[0029] Figure 7-2 It is the schematic development of the cylinder body Figure 2 ;

[0030] Figure 7-3 It is the axial view of the cylinder body;

[0031] Figure 7-4 It is the axonometric view of the cylinder body;

[0032] Figure 8-1 It is the front view of the rotor assembly;

[0033] Figure 8-2 It is Figure 8-1 the sectional view A-A in

[0034] Figure 9-1 It is the schematic development of the rear-end impeller body Figure 1 ;

[0035] Figure 9-2 It is the radial schematic diagram after the combination of the rear-end impeller bodies;

[0036] Figure 9-3 It is the axonometric view after the combination of the rear-end impeller bodies;

[0037] Figure 10 It is the schematic development diagram of the self-priming impeller module and the multi-stage impeller module;

[0038] Figure 11 It is the schematic development diagram of the rotor;

[0039] Figure 12-1 It is the axonometric view of the variable-diameter flow guide;

[0040] Figure 12-2 It is the radial schematic diagram of the variable-diameter flow guide;

[0041] Figure 12-3 It is the axial schematic diagram of the variable-diameter flow guide;

[0042] Figure 13-1 is an exploded view of a self-priming impeller module Figure 1 ;

[0043] Figure 13-2 is an exploded view of a self-priming impeller module Figure 2 ;

[0044] Figure 14 is a structural schematic diagram of a multi-stage impeller module;

[0045] Figure 15-1 is a structural schematic diagram of an impeller module connector;

[0046] Figure 15-2 is an exploded view of an impeller module connector;

[0047] In the figure:

[0048] Rear impeller 1, impeller tray 2, rear cover 3, middle plate 4, cylinder 5, front shell 6, grille 7, grille flange 8, front magnetic levitation stator 9, front permanent magnet 10, rotor flange 11, fixed flange 12, flow guide cover 13, rear permanent magnet 14, rear magnetic levitation stator 15, rear impeller cover 16;

[0049] Cylindrical steel ring 20, variable-diameter fluid guide rear cover 21, impeller b 22, front cover plate b 23, bolt body structure a 26, bolt body structure b 27, permanent magnet steel 28, bolt body 29;

[0050] Front cover plate a 30, self-priming blade 31, impeller a 39;

[0051] Electric control box 40, bolt body 41, drive stator 42, bolt slot 43, bolt body slot one 44, bolt body slot two 45, variable-diameter fluid guide installation groove 46, bolt groove 47, permanent magnet steel installation groove 48, bolt body structure installation groove 49;

[0052] Flange installation groove 50, front flange body 51, bearing outer ring 52, ball 53, bearing inner ring 54, rear flange body 55, front flange hole 56, bearing front fixing hole 57, bearing rear fixing hole 58, rear flange hole 59,

[0053] Self-priming impeller module a, multi-stage impeller module b, rear impeller body c. Specific implementation manner

[0054] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part rather than all of the embodiments of the present invention. The following description of at least one exemplary embodiment is actually illustrative only and in no way limits the present invention and its application or use. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the scope of protection of the present invention.

[0055] The terms used in the present invention are for the purpose of describing specific embodiments only and are not intended to limit the present invention. For example, the terms such as "front", "rear", "inner", "outer", "axial direction", "radial direction", etc. indicating orientation or positional relationship are only based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device / component referred to must have a specific orientation or be constructed and operated in a specific orientation, and thus cannot be construed as a limitation to the present invention.

[0056] In the present invention, unless otherwise clearly defined and limited, the terms such as "installation", "connection", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0057] Those skilled in the art can understand that, without conflict, the features in the following embodiments and implementation manners can be combined with each other.

[0058] As Figure 1 and Figure 2 shown, the magnetic levitation multi-stage differential speed shaftless water pump of the present invention includes a housing, a driving stator assembly and a magnetic levitation stator installed in the housing, and a rotor assembly. A circulating water flow channel communicating front and rear is provided between the rotor assembly and the driving stator assembly. The driving stator assembly includes at least two driving stators 42 distributed along the axial direction of the housing. The rotor assembly includes a magnetic levitation permanent magnet and a multi-stage impeller module b. The rotor assembly is in a magnetic levitation state by the cooperation of the magnetic levitation stator and the magnetic levitation permanent magnet. Each stage of the multi-stage impeller module b includes a rotor and an impeller assembly installed on the rotor. Each driving stator provides a driving force for the rotation of the rotor of the corresponding stage of the impeller module. By setting different voltages for different driving stators to control the rotation speeds of the corresponding rotors, differential rotation of the multi-stage impeller module is achieved.

[0059] Since the rotor assembly is in a magnetic levitation state by the cooperation of the magnetic levitation stator and the magnetic levitation permanent magnet, a shaftless design is realized, making the pump small in volume, high in efficiency and long in service life.

[0060] Through the differential rotation of the multi-stage impeller module, not only multi-stage pressurized transmission is achieved, fluid resistance is reduced, and the head of the pump is increased; but also the speed change between the multi-stage impellers significantly reduces the noise caused by fluid pressure change.

[0061] Such as Figure 3 and Figure 4 The housing of the magnetic levitation multi-stage differential shaftless water pump shown in the figure includes a front housing 6, a cylinder body 5, a middle plate 4 and a rear housing. Among them, the front housing 6 is connected to the cylinder body 5 by bolts. The middle plate 4 is connected to the cylinder body 5 by bolts. An electric control box 40 is installed outside the cylinder body 5. The cylinder body 5 is provided with a wiring hole, and a wire passes through the wiring hole and is connected to the electric control box 40. The middle plate 4 and the rear housing are connected by bolts and nuts.

[0062] Among them, the electric control box 40 includes a power output circuit module, a magnetic levitation control module, and a power management module. The power output circuit module controls each driving stator of the driving stator assembly, so that different driving stators are set with different voltages to control the speed of the corresponding rotor. The magnetic levitation control module controls the magnetic levitation stator, so that the stator and the rotor assembly maintain the rotor floating state through magnetic force. Further, the magnetic levitation control module includes a position adjustment control system, and the position adjustment control system is electrically connected to the distance sensor and the magnetic levitation stator. After receiving the distance value sensed by the distance sensor, it controls the output power of the magnetic levitation stator, and then controls the magnetic force between the magnetic levitation stator and the rotor to maintain the floating state.

[0063] Further, the front housing 6 is provided with a water flow channel inlet. A grille step is provided at the front end of the water flow channel inlet. The grille 7 is placed on the grille step and fixed by a grille flange 8. A front magnetic levitation stator step is provided at the rear end of the water flow channel inlet. The front magnetic levitation stator 9 is installed on the front magnetic levitation stator step.

[0064] Such as Figures 3 to 6 As shown in the figure, the rear housing includes three parts: a guide cover 13, an impeller tray 2 and a rear cover 3. The guide cover 13, the impeller tray 2 and the rear cover 3 are fitted and connected. The rear cover 3 is connected to the middle plate 4 by bolts and nuts, and at the same time fixes the guide cover 13 and the impeller tray 2. A water flow channel outlet is provided at the center of the rear cover 3.

[0065] Further, a support hole is provided at the center of the impeller tray 2. The impeller tray 2 is provided with an annular groove around the support hole. The rear magnetic levitation stator 15 is installed on the impeller tray 2, and the rear magnetic levitation stator 15 is fitted and installed in the annular groove.

[0066] Such as Figures 7-1 to 7-4As shown in the figure, multiple sets of drive stators 42 are axially installed inside the cylinder body 5, and the drive stators 42 are provided with torque windings. A bolt body groove 44 and a bolt body groove 45 are provided on the outer side wall of the drive stator 42. The drive stator 42 and the cylinder body 5 are fitted by a bolt body 41, and a bolt fitting groove 43 is provided on the inner wall of the cylinder body. The bolt body 41 is bolted to the bolt body groove 44, the bolt body groove 45, and the bolt fitting groove 43 to fix the drive stator 42 and the cylinder body 5.

[0067] Further, the space between the drive stator 42 and the cylinder body 5 is filled with a waterproof and non-conductive filler.

[0068] As Figure 8-1 and Figure 8-2 shown in the figure, the rotor assembly of the magnetic levitation multi-stage shaftless water pump includes a front permanent magnet 10, a rear permanent magnet 14, a self-priming impeller module a, a multi-stage impeller module b, and a rear end impeller body c. The front permanent magnet 10 is installed at the front end of the self-priming impeller module a, and the rear permanent magnet 14 is installed at the rear end of the rear end impeller body c.

[0069] As Figures 9-1 to 9-3 shown in the figure, the rear end impeller body c includes a rear impeller cover 16, a rear impeller 1, a rotor flange 11, and a fixed flange 12. The fixed flange 12 has a plurality of screw holes distributed on two concentric circles with different diameters inside and outside. The rear impeller cover 16 is bolted to the outer screw holes of the fixed flange 12, and at the same time, the rear impeller cover 16 and the rear impeller 1 are connected by a fitting bolt. The rotor flange 11 is bolted to the inner screw holes of the fixed flange 12.

[0070] Further, radial protrusions are circumferentially distributed on the periphery of the rear impeller 1, and corresponding fitting grooves are circumferentially distributed on the periphery of the rear impeller cover 16, and the radial protrusions are embedded in the fitting grooves. A ring groove is provided around the impeller shaft at the rear end of the rear impeller 1, and the rear permanent magnet 14 is fitted and installed in the ring groove of the rear impeller. The impeller shaft of the rear impeller is supported in the support hole.

[0071] As Figure 10 shown in the figure, the self-priming impeller module a and the multi-stage impeller module b are connected in series.

[0072] As Figure 11 shown in the figure, both the self-priming impeller module a and the multi-stage impeller module b are provided with rotors. The rotor includes a cylindrical steel ring 20 and a number of permanent magnet steels 28 evenly distributed along the circumference of the cylindrical steel ring 20. A permanent magnet installation groove 48 is provided on the outer side of the cylindrical steel ring 20, a variable-diameter flow guide body installation groove 46 is provided on the inner side, and annular grooves 18 and flange installation grooves 50 are provided on the front and rear sides. The annular groove 18 is located radially outside the flange installation groove 50, and the two form a stepped shape, and the rotor flange 11 is fitted with the flange installation groove 50.

[0073] Specifically, the impeller assembly includes an impeller, a front cover plate and a variable-diameter fluid guide respectively covering the front and rear sides of the impeller. A water flow passage hole for water flow to pass through is provided at the center of the front cover plate and the variable-diameter fluid guide. The variable-diameter fluid guide is connected to the cylindrical steel ring 20.

[0074] As Figures 12-1 to 12-3 shown, the variable-diameter fluid guide is composed of a bolt body structure a 26, a bolt body structure b 27 and a variable-diameter fluid guide rear cover 21. An installation groove 49 for the bolt body structure is provided on the outer side of the variable-diameter fluid guide rear cover 21. The bolt body structure a 26 and the bolt body structure b 27 are fitted and connected and installed on the bolt body structure installation groove 49 of the variable-diameter fluid guide rear cover 21. Among them, the bolt body structure b 27 is inserted into the cylindrical steel ring 20 through the variable-diameter fluid guide installation groove 46 inside the cylindrical steel ring 20, and the bolt body structure b 27 is fitted with the bolt groove 47 inside the cylindrical steel ring 20 by rotation. Then, the bolt body 29 is inserted into the bolt groove 47 inside the cylindrical steel ring 20. The above design enables the variable-diameter fluid guide of the bolt body structure to be conveniently disassembled and installed to repair the impeller blades.

[0075] As Figure 13-1 and Figure 13-2 shown, the self-priming impeller module a includes an impeller a 39, a front cover plate a 30, and also includes a self-priming blade 31. The impeller a 39 is provided with an impeller shaft. The self-priming blade 31 is fitted on the impeller shaft of the impeller a 39 and fixed by bolts to form an impeller body. A self-priming port is provided at the center of the front cover plate a 30. The impeller shaft extends forward from the self-priming port and is connected to the self-priming blade 31. The impeller body, the front cover plate a 30 and the variable-diameter fluid guide rear cover 21 are fixed by variable-diameter fluid guide fitting bolts to form the self-priming impeller module a.

[0076] Of course, those skilled in the art can understand that the drive stator assembly further includes a drive stator corresponding to the rotor of the self-priming impeller module. The self-priming impeller module a and the multi-stage impeller module b also rotate at different speeds.

[0077] As Figure 14 shown, the multi-stage impeller module b includes an impeller b 22 and a front cover plate b 23. The impeller b 22, the front cover plate b 23 and the variable-diameter fluid guide rear cover 21 are fixed by variable-diameter fluid guide fitting bolts to form the multi-stage impeller module b.

[0078] In order to realize the rotational connection between the self-priming impeller module a and the multi-stage impeller module b and the independent rotation between the stages of the multi-stage impeller module b, an impeller module connector is also provided. As Figure 15-1 and Figure 15-2As shown in the figure, the impeller module connector includes a front flange body 51, a rear flange body 55 and a ball bearing, wherein the ball bearing is fitted into the annular groove 18. The ball bearing includes an outer bearing ring 52, balls 53 and an inner bearing ring 54. Among them, the side wall of the front flange body 51 is provided with a front bearing fixing hole 57, and the front wall is provided with a front flange hole 56. The side wall of the rear flange body 55 is provided with a rear bearing fixing hole 58, and the rear wall is provided with a rear flange hole 59.

[0079] Among them, the front flange body 51 is bolt-fixed to the flange mounting groove 50 of the cylindrical steel ring 20 of the self-priming impeller module a or the multi-stage impeller module b through the front flange hole 56. The rear flange body 55 is bolt-fixed to the flange mounting groove 50 of the cylindrical steel ring 20 of the multi-stage impeller module b through the rear flange hole 59. The front flange body 51 is bolt-fixed to the outer bearing ring 52 through the front bearing fixing hole 57, and the rear flange body 55 is bolt-fixed to the inner bearing ring 54 through the rear bearing fixing hole 58.

[0080] In addition, in order to realize the connection between the last stage of the multi-stage impeller module b and the rear impeller body c, the rotor flange 11 of the rear impeller body c is supported in the flange mounting groove 50 of the last stage of the multi-stage impeller module b to realize bolt connection between the two.

[0081] In the above technical solution, the self-priming impeller module a and the multi-stage impeller module b are arranged in sequence along the axial direction of the rotor assembly. Between the self-priming impeller module a and the multi-stage impeller module b, and between the stages of the multi-stage impeller module b are rotationally connected by the impeller module connector. Therefore, while being axially connected as a whole, they can all rotate independently.

[0082] The front magnetic levitation stator 9 cooperates with the front permanent magnet 10, and the rear magnetic levitation stator 15 cooperates with the rear permanent magnet 14. The entire rotor assembly is in a magnetic levitation state through the cooperation of the magnetic levitation stator and the magnetic levitation permanent magnet, realizing a shaftless design. The distance sensor detects the distance between the magnetic levitation stator and the magnetic levitation permanent magnet, and adjusts the output power according to the distance value. Specifically, after the distance between the front magnetic levitation stator and the front magnetic levitation permanent magnet is greater than the threshold value, the poles of the front magnetic levitation stator are adjusted to be different from those of the magnetic levitation permanent magnet to pull the rotor into the threshold range; after the distance between the front magnetic levitation stator and the front magnetic levitation permanent magnet is less than the threshold value, the poles of the front magnetic levitation stator are adjusted to be the same as those of the magnetic levitation permanent magnet to push the rotor into the threshold range; the greater the deviation range, the greater the power of the magnetic levitation stator.

[0083] Since both the self-priming impeller module a and the multi-stage impeller module b adopt a modular impeller design, it is easy to replace the impeller.

[0084] In addition, in the above-mentioned rotor assembly, an annular circulating water flow channel is formed between the self-priming impeller module a and the multi-stage impeller module b, connecting the guide cover 13 and the water flow channel inlet, reducing friction while realizing water circulation, thereby reducing noise and energy consumption.

[0085] Figure 1 The fluid flow path during the operation of the magnetic levitation multi-stage differential shaftless water pump according to the present invention is shown. The fluid enters the pump chamber through the water flow channel inlet on the front housing 6, and through the action of the self-priming vane 31, the water at its front end and in the circulating water flow channel is sucked into the pump body.

[0086] The water entering the pump body is first centrifugally driven by the impeller a39 in the self-priming impeller module a. The water obtains the kinetic energy provided by the blades and moves towards the outer periphery of the impeller. Through the variable-diameter guide vane rear cover 21, the water turns to the back of the impeller a39 and flows out from the outlet of the variable-diameter guide vane rear cover 21 into the multi-stage impeller module b. Similarly, it passes through each stage in the multi-stage impeller module b in turn, and the water is accelerated multiple times to achieve multi-stage pressurized transmission.

[0087] Finally, it is sent to the guide channel of the guide cover 13 through the rear impeller 11. The water is divided into two paths in the guide channel of the guide cover 13. One path flows out through the water flow channel outlet of the rear cover 3, and the other path circulates forward towards the water flow channel inlet through the circulating water flow channel.

[0088] As described above, the above is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that the present invention includes but is not limited to the content described in the above specific implementation manner. Any modification that does not deviate from the functional and structural principles of the present invention will be included in the scope of the claims.

Claims

1. A magnetic levitation multi-stage differential speed shaftless water pump, characterized in that: It includes a housing, a driving stator assembly and a magnetic levitation stator and a rotor assembly installed in the housing. There is a circulating water flow channel that is connected front and back between the rotor assembly and the driving stator assembly. The driving stator assembly includes at least two driving stators distributed along the axial direction of the housing. The rotor assembly includes a magnetic levitation permanent magnet and a multi-stage impeller module. The rotor assembly is in a magnetic levitation state through the cooperation of the magnetic levitation stator and the magnetic levitation permanent magnet. Each stage of the multi-stage impeller module includes a rotor and an impeller assembly installed on the rotor. Each driving stator provides a driving force for the rotation of the rotor of the corresponding stage of the impeller module. By setting different voltages for different driving stators, the rotation speed of the corresponding rotor is controlled to achieve differential rotation of the multi-stage impeller module; it also includes an electronic control box, and the electronic control box includes a power output circuit module, a magnetic levitation control module, and a power management module. Among them, the power output circuit module controls each driving stator of the driving stator assembly to set different voltages to control the rotation speed of the corresponding rotor. The magnetic levitation control module controls the magnetic levitation stator to keep the rotor in a suspended state through magnetic force between the stator and the rotor assembly. The magnetic levitation control module includes a position adjustment control system. The position adjustment control system is electrically connected to a distance sensor and the magnetic levitation stator. After receiving the distance value sensed by the distance sensor, it controls the output power of the magnetic levitation stator, and then controls the magnetic force between the magnetic levitation stator and the rotor to maintain the suspended state. The rotor includes a cylindrical steel ring and a number of permanent magnet steels evenly distributed along the circumference of the cylindrical steel ring. The impeller assembly includes an impeller and a front cover plate and a variable-diameter fluid guide respectively covering the front and rear sides of the impeller. The front cover plate and the variable-diameter fluid guide are provided with water flow channel holes for water to pass through. The variable-diameter fluid guide is connected to the cylindrical steel ring. The rotor assembly also includes a self-priming impeller module located in front of the multi-stage impeller module. The self-priming impeller module includes the rotor and the impeller assembly. The center of the front cover plate of the self-priming impeller module is provided with a self-priming port. The impeller of the self-priming impeller module is connected to a self-priming impeller shaft. The self-priming impeller shaft extends forward from the self-priming port and is connected with a self-priming blade. The driving stator assembly also includes a driving stator provided corresponding to the rotor of the self-priming impeller module. The magnetic levitation stator includes a front magnetic levitation stator and a rear magnetic levitation stator. The magnetic levitation permanent magnet includes a front permanent magnet that cooperates with the front magnetic levitation stator and a rear permanent magnet that cooperates with the rear magnetic levitation stator. The front permanent magnet is installed at the front end of the rotor in the self-priming impeller module. The rear permanent magnet is installed on the rear impeller.

2. A magnetic levitation multi-stage differential speed shaftless water pump according to claim 1, characterized in that: The cylindrical steel ring and the variable-diameter fluid guide are connected through a bolt structure. There is a variable-diameter fluid guide installation groove on the inner side of the cylindrical steel ring. The variable-diameter fluid guide includes a variable-diameter fluid guide rear cover. There is a bolt structure installation groove on the outer side of the variable-diameter fluid guide rear cover. The bolt structure is fitted in the bolt structure installation groove and the variable-diameter fluid guide installation groove.

3. A magnetic levitation multi-stage differential speed shaftless water pump according to claim 1, characterized in that: the housing includes a cylinder body and a front housing connected to the front end of the cylinder body, the front housing is provided with a water flow channel inlet, and the self-priming blades are arranged at the water flow channel inlet.

4. A magnetic levitation multi-stage differential speed shaftless water pump according to claim 3, characterized in that: a rear end impeller body is arranged at the rear side of the multi-stage impeller module, the rear end impeller body includes a rear impeller cover and a rear impeller connected together, and a plurality of radial through grooves are arranged along the circumferential direction of the rear impeller cover.

5. A magnetic levitation multi-stage differential speed shaftless water pump according to claim 4, characterized in that: the rear end of the cylinder body is connected with a rear housing, the rear housing includes an impeller tray, a guide cover and a rear cover which are sequentially connected from front to back, a water flow channel outlet is arranged at the center of the rear cover, a support hole is arranged at the center of the impeller tray, and the impeller shaft of the rear impeller is supported in the support hole.

6. A magnetic levitation multi-stage differential speed shaftless water pump according to any one of claims 1 to 5, characterized in that: between the self-priming impeller module and the multi-stage impeller module, between adjacent two stages of the multi-stage impeller module, and between the multi-stage impeller module and the rear end impeller body are all rotationally connected through impeller module connectors.

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