Rare-earth-free assisted magnetic synchronous reluctance high-efficiency shielded electric pump

Abstract

The utility model discloses a kind of rare-earth-free magnetic-assisted synchronous reluctance high-efficiency shielding electric pump, including pump cavity mechanism and drive mechanism.Pump cavity mechanism contains pump body, and front bearing seat and impeller in pump cavity are formed by being enclosed with pump body;Drive mechanism contains pump shaft with one end being connected with impeller, front bearing sealing assembly, rotor assembly, rear bearing sealing assembly and rear bearing seat are sequentially set on pump shaft, and stator assembly is arranged outside rotor assembly with pump shell.Rotor assembly includes reluctance rotor lamination, at least four groups of magnetic barrier that are rotationally symmetric with lamination center as center, peripheral shielding sleeve and two end plates and screen plate.Magnetic barrier contains magnetic-assisted permanent magnet slot group and both sides through slot group.The electric pump rotor adopts rare-earth-free permanent magnet magnetic-assisted synchronous reluctance design, optimizes magnetic circuit, and cooperates with synchronous reluctance and permanent magnet magnetic-assisted to improve motor power density and efficiency;Through slot group obtuse angle included angle and symmetrical layout reduce magnetic flux leakage, enhance reluctance torque, make torque output more stable, improve electric pump power performance and working condition adaptation ability.

Description

Technical Field

[0001] This utility model relates to the field of shielded electric pump technology, specifically to a high-efficiency shielded electric pump with rare earth-free magnetizing synchronous reluctance. Background Technology

[0002] Shielded electric pumps, as leak-free conveying devices, isolate the motor rotor from the stator through a shielding sleeve, preventing direct contact between the conveyed medium and the motor windings. They are widely used for conveying corrosive, flammable, explosive, toxic, and hazardous media. However, most existing shielded electric pumps use three-phase asynchronous motors for drive, which have the following technical drawbacks: 1. Asynchronous motors have low starting torque and low operating efficiency, and the eddy current loss of the shielding sleeve further reduces the overall operating efficiency. Especially when operating under varying conditions, energy loss increases significantly, which does not conform to the industry development trend of high efficiency and energy saving. 2. Asynchronous motors have a low power factor, requiring additional reactive power compensation devices, which increases system cost and floor space. 3. Asynchronous shielded motors have slip, which reduces the pump head; 4. Although traditional rare earth permanent magnet synchronous motors have high efficiency, they rely on rare earth permanent magnet materials, which poses a risk of permanent magnet demagnetization. They are also expensive and have insufficient reliability under harsh conditions such as high temperature and strong magnetic field. Utility Model Content

[0003] The purpose of this invention is to overcome at least one of the defects of the prior art and provide a rare earth-free, synchronous magnetic reluctance, high-efficiency shielded electric pump.

[0004] The objective of this utility model can be achieved through the following technical solutions: A rare-earth-free, synchronous reluctance, high-efficiency shielded electric pump includes: A pump chamber mechanism includes a pump body, a front bearing housing that surrounds the pump body to form a pump chamber, and an impeller disposed within the pump chamber. The drive mechanism includes a pump shaft with one end connected to the impeller drive, and a front bearing sealing assembly, a rotor assembly, a rear bearing sealing assembly and a rear bearing housing sequentially sleeved on the pump shaft. A stator assembly and a pump casing are sequentially arranged on the outside of the rotor assembly. The rotor assembly includes: Reluctance rotor laminations; At least four sets of magnetic barriers are arranged rotationally symmetrically on the reluctance rotor lamination with the center of the lamination as the center of rotational symmetry. Each magnetic barrier includes a set of auxiliary permanent magnet slots and a pair of through slots arranged on both sides of the auxiliary permanent magnet slots. Each set of auxiliary permanent magnet slots includes multiple layers of auxiliary permanent magnet slots, and each layer of auxiliary permanent magnet slots contains an auxiliary permanent magnet. The auxiliary permanent magnet is a ferrite auxiliary permanent magnet. A shielding sleeve is installed around the reluctance rotor laminations; The end plates and screen plates are respectively installed at both ends of the reluctance rotor laminations.

[0005] Furthermore, the magnetizing permanent magnet slot assembly includes four layers of magnetizing permanent magnet slots.

[0006] Furthermore, the pair of through slots are symmetrically distributed on both sides of the magnetizing permanent magnet slot group. The through slot group includes four layers of through slots. Each through slot includes a first slot portion that is on the same horizontal plane as the opposite magnetizing permanent magnet slot and a second slot portion that forms an angle with the first slot portion; the angle is an obtuse angle.

[0007] Furthermore, a keyway is provided on the inner surface of the reluctance rotor lamination.

[0008] Furthermore, an impeller nut is provided between the pump shaft and the impeller for connecting the two.

[0009] Furthermore, the front bearing housing is sleeved on the pump shaft, and the front bearing sealing assembly is disposed within the front bearing housing.

[0010] Furthermore, a front stator flange is provided between the stator assembly and the front bearing housing to connect the two; a rear stator flange is provided between the stator assembly and the rear bearing housing to connect the two.

[0011] Furthermore, a pair of thrust discs are also fitted on the pump shaft, and the pair of thrust discs are respectively arranged on both sides of the rotor assembly; a heat sleeve is also provided at the point where the screen plate abuts the pump shaft.

[0012] Furthermore, the shielding sleeve comprises, from the inside out, an inner ceramic coating, a honeycomb Hastelloy layer, an amorphous alloy layer, and an outer ceramic coating, stacked sequentially. The inner and outer ceramic coatings are zirconia ceramic coatings, and the amorphous alloy layer is one of an iron-based amorphous alloy, a cobalt-based amorphous alloy, and an iron-nickel-based amorphous alloy. The thickness of the honeycomb Hastelloy layer is 0.3-0.5 mm.

[0013] Furthermore, the canned pump is also provided with a support body for supporting the stator assembly. The support body is a shock-absorbing support seat with an arc-shaped pad on it. Rubber is placed on the arc-shaped pad for connection and fixation, which can effectively reduce the vibration of the canned pump during operation, ensure good internal structure sealing, and long service life.

[0014] Compared with the prior art, the present invention has the following advantages: (1) This utility model provides a rare earth-free synchronous reluctance high-efficiency shielded electric pump. The rotor assembly of the shielded electric pump adopts a synchronous reluctance design with no rare earth permanent magnet. By setting at least four sets of magnetic barriers with the center of rotational symmetry as the center on the reluctance rotor lamination, and cooperating with the multi-layer magnet slots and magnets to form an optimized magnetic circuit, the power density and operating efficiency of the motor are improved by the synergistic effect of synchronous reluctance and permanent magnet. The obtuse angle structure and rotational symmetry layout of the through slots on both sides of the magnetic barriers effectively reduce the magnetic leakage phenomenon, enhance the reluctance torque, make the torque output more uniform and stable, and improve the power performance and working condition adaptability of the electric pump.

[0015] (2) This utility model provides a rare earth-free magnetized synchronous reluctance high-efficiency shielded electric pump. The shielded electric pump is driven by a magnetized synchronous reluctance motor, which combines the advantages of high reluctance torque of synchronous reluctance motor and high power factor of magnetized permanent magnet. The motor has low operating loss, wide high efficiency range, and power factor ≥0.95. Compared with the shielded electric pump driven by traditional asynchronous motor, the energy saving effect is significant, and the annual power consumption can be reduced by 15-20%. (3) This utility model provides a rare earth-free synchronous reluctance high-efficiency shielded electric pump. The auxiliary permanent magnet embedded in the rotor of the shielded electric pump adopts a low coercivity design and low-cost ferrite material, which avoids the risk of demagnetization under high temperature and strong magnetic field, and at the same time reduces the amount of magnet used. Compared with traditional permanent magnet synchronous motors, the cost is reduced by 30-40%. (4) This utility model provides a rare earth-free magnetic synchronous reluctance high-efficiency shielded electric pump. The shielding sleeve of the electric pump is made of Hastelloy material and is equipped with a ceramic coating with an optimized thickness of 0.3-0.5mm. It has excellent corrosion resistance, wear resistance and magnetic shielding performance, which can effectively protect the rotor assembly from the erosion of the conveying medium, adapt to harsh working conditions such as corrosiveness, and reduce eddy current loss and improve motor efficiency while ensuring strength and sealing. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of a high-efficiency shielded electric pump without rare earth-assisted magnetization synchronous reluctance in the embodiment. Figure 2 This is a cross-sectional view of the rotor assembly in the embodiment; Figure 3 This is a schematic diagram of the reluctance rotor lamination in the embodiment; Figure 4 This is a cross-sectional view of the reluctance rotor lamination in the embodiment; The numbers in the diagram indicate: 1-Pump body; 2-Impeller; 3-Stator front flange; 4-Front bearing housing; 5-Front bearing sealing assembly; 6-Stator assembly; 7-Pump shaft; 8-Rear bearing housing; 9-Stator rear flange; 10-Rotor assembly; 11-Thrust disc; 12-Pump casing; 13-Rear bearing sealing assembly; 14-Support body; 15-Heat jacket; 16-Screw plate; 17-Magnetic reluctance rotor lamination; 18-Shielding sleeve; 19-End plate; 20-Magnetic auxiliary permanent magnet slot; 21-Magnetic auxiliary permanent magnet; 22-Through slot; 2201-First slot; 2202-Second slot; 23-Keyway. Detailed Implementation

[0017] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. These embodiments are implemented based on the technical solution of the present invention, providing detailed implementation methods and specific operating procedures. However, the scope of protection of the present invention is not limited to the following embodiments.

[0018] Example 1 This embodiment provides a rare-earth-free, synchronous reluctance, high-efficiency shielded electric pump. See the specific structure below. Figure 1-4 ,include: The pump chamber mechanism includes a pump body 1, a front bearing seat 4 that surrounds the pump body 1 to form a pump chamber, and an impeller 2 disposed in the pump chamber. The drive mechanism includes a pump shaft 7 with one end connected to the impeller 2 for transmission, and a front bearing sealing assembly 5, a rotor assembly 10, a rear bearing sealing assembly 13, and a rear bearing housing 8 sequentially sleeved on the pump shaft 7. A stator assembly 6 and a pump housing 12 are sequentially arranged on the outside of the rotor assembly 10. The front bearing sealing assembly 6 and the rear bearing sealing assembly 13 each contain accessories such as bearing housings, bearings, bushings, and mechanical seals. The bushings are made of silicon carbide. The rotor assembly includes: Magnetic reluctance rotor lamination 17; At least four sets of magnetic barriers are arranged rotationally symmetrically on the reluctance rotor lamination 17 with the center of the circle as the center of rotational symmetry. The magnetic barriers include a set of auxiliary permanent magnet slots and a pair of through slots arranged on both sides of the auxiliary permanent magnet slots. The auxiliary permanent magnet slots include multiple layers of auxiliary permanent magnet slots 20, and each layer of auxiliary permanent magnet slots 20 is provided with an auxiliary permanent magnet 21. The auxiliary permanent magnet is a ferrite auxiliary permanent magnet. A shielding sleeve 18 is provided around the reluctance rotor lamination 17; End plates 19 and screen plates 16 are respectively provided at both ends of the reluctance rotor lamination 17, and a heat sleeve 15 is also provided at the abutment of the screen plate 16 and the pump shaft 7; Specifically, the rotor assembly 10 in this embodiment adopts a synchronous reluctance design without rare earth permanent magnet assistance. By setting at least four sets of magnetic barriers with the center of rotational symmetry as the center on the reluctance rotor lamination 17, and in conjunction with the optimized magnetic circuit formed by the multi-layer magnet assisting permanent magnet slots 20 and magnet assisting permanent magnets 21, the power density and operating efficiency of the motor are improved by the synergistic effect of synchronous reluctance and permanent magnet assistance. The obtuse angle structure and rotational symmetry layout of the through slot groups 22 on both sides of the magnetic barriers effectively reduce magnetic leakage, enhance reluctance torque, make the torque output more uniform and stable, and improve the power performance and working condition adaptability of the electric pump.

[0019] In this embodiment, the magnetizing permanent magnet slot group includes four layers of magnetizing permanent magnet slots 20.

[0020] In this embodiment, the pair of through slots are symmetrically distributed on both sides of the magnetizing permanent magnet slot group. The through slot group includes four layers of through slots 22. Each through slot 22 includes a first slot portion 2201 that is on the same horizontal plane as the opposite magnetizing permanent magnet slot 20, and a second slot portion 2202 that has an angle with the first slot portion 2201; the angle is an obtuse angle.

[0021] In this embodiment, a keyway 23 is provided on the inner surface of the reluctance rotor lamination 17.

[0022] In this embodiment, an impeller nut is provided between the pump shaft 7 and the impeller 2 to connect the two.

[0023] In this embodiment, the front bearing housing 4 is sleeved on the pump shaft 7, and the front bearing sealing assembly 5 is disposed inside the front bearing housing 4.

[0024] In this embodiment, a stator front flange 3 is provided between the stator assembly 6 and the front bearing housing 4 to connect the two; a stator rear flange 9 is provided between the stator assembly 6 and the rear bearing housing 8 to connect the two.

[0025] In this embodiment, a pair of thrust discs 11 are also sleeved on the pump shaft 7, and the pair of thrust discs 11 are respectively disposed on both sides of the rotor assembly 10; In this embodiment, the shielding sleeve 18 comprises, from the inside out, an inner ceramic coating, a honeycomb Hastelloy layer, an amorphous alloy layer, and an outer ceramic coating, stacked sequentially. The inner and outer ceramic coatings are zirconia ceramic coatings, and the amorphous alloy layer is one of an iron-based amorphous alloy, a cobalt-based amorphous alloy, and an iron-nickel-based amorphous alloy. The thickness of the honeycomb Hastelloy layer is 0.3-0.5 mm.

[0026] In this embodiment, the shielded pump is further provided with a support body 14 for supporting the stator assembly 6. The support body 14 is a shock-absorbing support seat. An arc-shaped pad is provided on the shock-absorbing support seat, and rubber is placed on the arc-shaped pad for connection and fixation. This can effectively reduce the vibration of the shielded pump during operation, ensure good internal structure sealing, and extend service life.

[0027] Working principle: When the shielded electric pump provided in this embodiment is working, the grid voltage is connected to the stator assembly through the frequency converter to generate a rotating magnetic field. Under the action of the rotating magnetic field, the rotor assembly 10 is driven to rotate by the salient pole reluctance torque and the synchronous torque generated by the auxiliary permanent magnet 21, so as to achieve synchronous operation. The auxiliary magnetic field provided by the auxiliary permanent magnet 21 can significantly improve the power factor and operating efficiency of the motor, while reducing the inrush current during startup. The shielding sleeve 18 isolates the motor stator assembly 6 from the rotor assembly 10 to prevent the conveyed medium from entering the motor and ensure the safe operation of the motor. In the pump body cavity, the impeller 2 rotates under the drive of the motor, converting mechanical energy into the kinetic and potential energy of the fluid, so as to achieve leakage-free conveying of the medium.

[0028] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of this utility model without departing from its technical solution shall still fall within the protection scope of this utility model.

Claims

1. A rare-earth-free, synchronous reluctance, high-efficiency shielded electric pump, characterized in that, include: The pump chamber mechanism includes a pump body (1), a front bearing seat (4) that surrounds the pump body (1) to form a pump chamber, and an impeller (2) disposed in the pump chamber. The drive mechanism includes a pump shaft (7) that is connected to the impeller (2) at one end, and a front bearing sealing assembly (5), a rotor assembly (10), a rear bearing sealing assembly (13) and a rear bearing housing (8) sequentially mounted on the pump shaft (7). A stator assembly (6) and a pump casing (12) are sequentially arranged on the outside of the rotor assembly (10). The rotor assembly includes: Reluctance rotor lamination (17); At least four sets of magnetic barriers are arranged in rotational symmetry on the reluctance rotor lamination (17) with the center of the reluctance rotor lamination (17) as the center of rotational symmetry. The magnetic barriers include a set of auxiliary permanent magnet slots and a pair of through slots arranged on both sides of the auxiliary permanent magnet slots. The auxiliary permanent magnet slots include multiple layers of auxiliary permanent magnet slots (20), and each layer of auxiliary permanent magnet slots (20) is provided with an auxiliary permanent magnet (21). A shielding sleeve (18) is provided around the magnetic reluctance rotor lamination (17). End plates (19) and screen plates (16) are respectively set at both ends of the reluctance rotor lamination (17).

2. The rare-earth-free, synchronous reluctance, high-efficiency shielded electric pump according to claim 1, characterized in that, The magnetizing permanent magnet slot assembly includes four layers of magnetizing permanent magnet slots (20).

3. The rare-earth-free, synchronous reluctance, high-efficiency shielded electric pump according to claim 1, characterized in that, The pair of through slots are symmetrically distributed on both sides of the magnetizing permanent magnet slot group. The through slot group includes four layers of through slots (22). Each through slot (22) includes a first slot portion (2201) on the same horizontal plane as the opposite magnetizing permanent magnet slot (20) and a second slot portion (2202) with an angle to the first slot portion (2201); the angle is an obtuse angle.

4. The rare-earth-free, synchronous reluctance, high-efficiency shielded electric pump according to claim 1, characterized in that, The inner surface of the reluctance rotor lamination (17) is provided with a keyway (23).

5. The rare-earth-free, synchronous reluctance, high-efficiency shielded electric pump according to claim 1, characterized in that, An impeller nut is provided between the pump shaft (7) and the impeller (2) for connecting the two.

6. The rare-earth-free, synchronous reluctance, high-efficiency shielded electric pump according to claim 1, characterized in that, The front bearing housing (4) is sleeved on the pump shaft (7), and the front bearing sealing assembly (5) is disposed inside the front bearing housing (4).

7. The rare-earth-free, synchronous reluctance, high-efficiency shielded electric pump according to claim 1, characterized in that, A stator front flange (3) is provided between the stator assembly (6) and the front bearing housing (4) to connect the two; a stator rear flange (9) is provided between the stator assembly (6) and the rear bearing housing (8) to connect the two.

8. The rare-earth-free, synchronous reluctance, high-efficiency shielded electric pump according to claim 1, characterized in that, A pair of thrust discs (11) are also fitted on the pump shaft (7), and the pair of thrust discs (11) are respectively arranged on both sides of the rotor assembly (10); a heat sleeve (15) is also provided at the point where the screen plate (16) abuts against the pump shaft (7).

9. The rare-earth-free, synchronous reluctance, high-efficiency shielded electric pump according to claim 1, characterized in that, The shielding sleeve (18) comprises an inner ceramic coating, a honeycomb Hastelloy layer, an amorphous alloy layer and an outer ceramic coating stacked sequentially from the inside out.

10. The rare-earth-free, synchronous reluctance, high-efficiency shielded electric pump according to claim 1, characterized in that, The shielded electric pump is also provided with a support body (14) for supporting the stator assembly (6), and the support body (14) is a shock-absorbing support seat.

Images