Booster pump and water purification equipment

Abstract

The utility model discloses a booster pump and water purification equipment. The booster pump comprises a pump head, a motor and a fixing piece, the motor is connected with the pump head, and the motor comprises a plastic package shell, a stator assembly and a rotor assembly; a mounting cavity is formed in the plastic package shell, and the stator assembly and the plastic package shell are integrated through injection molding; the rotor assembly is arranged in the mounting cavity and is matched with the stator assembly; the rotor assembly comprises a rotor iron core and a plurality of permanent magnets, the rotor iron core is provided with a shaft hole and a plurality of mounting grooves, the plurality of mounting grooves are arranged at intervals along the circumferential direction of the shaft hole, one permanent magnet is correspondingly mounted in one mounting groove, and the groove wall of each mounting groove is provided with a limiting groove; at least part of the fixing piece is arranged in the limiting groove and abuts against the permanent magnet so that the permanent magnet can be fixed in the mounting groove. The stability of an existing booster pump can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of water purification, and particularly relates to a booster pump and a water purification device. Background Art

[0002] As the core components of a motor, the design of the stator and the rotor directly affects the performance and efficiency of the motor. The stability of the stator and the rotor in the existing motor structure is poor, which further reduces the stability of the booster pump using the same. Summary of the Utility Model

[0003] The main purpose of the utility model is to provide a booster pump and a water purification device, aiming to improve the stability of the existing booster pump.

[0004] To achieve the above purpose, the booster pump proposed by the utility model includes:

[0005] A pump head; and

[0006] A motor connected to the pump head, the motor includes a plastic sealed housing, a stator assembly and a rotor assembly; the plastic sealed housing forms an installation cavity, the stator assembly is injection-molded with the plastic sealed housing as a whole; the rotor assembly is arranged in the installation cavity and is matched with the stator assembly; the rotor assembly includes a rotor core and a plurality of permanent magnets, the rotor core has a shaft hole and a plurality of installation grooves, the plurality of installation grooves are arranged at intervals along the circumferential direction of the shaft hole, and one permanent magnet is correspondingly installed in one installation groove, and a limiting groove is arranged on the groove wall of the installation groove; and

[0007] A fixing member, at least part of the fixing member is arranged in the limiting groove and abuts against the permanent magnet to fix the permanent magnet in the installation groove.

[0008] In an embodiment, along the width direction of the permanent magnet, the installation groove has a first groove wall and a second groove wall arranged oppositely, and the limiting grooves are arranged on both the first groove wall and the second groove wall, and at least part of the fixing member is arranged in the limiting grooves on the first groove wall and the second groove wall and abuts against the opposite sides of the permanent magnet.

[0009] In an embodiment, at least one limiting groove is arranged on the first groove wall and / or the second groove wall;

[0010] And / or, the limiting groove is arranged in the middle of the first groove wall and / or the second groove wall;

[0011] In an embodiment, the groove wall of the limiting groove is arc-shaped;

[0012] And / or, the radian of the groove wall of the limiting groove is R1, and the R1 satisfies: 0.1mm ≤ R1 ≤ 0.5mm.

[0013] In one embodiment, there is an installation gap between the permanent magnet and the groove wall of the installation groove, and at least part of the fixing member is disposed in the limiting groove and the installation gap and abuts against the permanent magnet.

[0014] In one embodiment, the fixing member includes a rivet, and the rivet is inserted into the limiting groove and abuts against the permanent magnet;

[0015] Alternatively, the fixing member includes a plastic encapsulation member, and the limiting groove is filled with the plastic encapsulation member, and the plastic encapsulation member is integrally injection-molded to connect the rotor core and the plurality of permanent magnets.

[0016] In one embodiment, the rotor core includes a rotor yoke and a plurality of rotor teeth. The plurality of rotor teeth are arranged at intervals along the circumferential direction of the rotor yoke. An installation groove is formed between two adjacent rotor teeth. A support protrusion is arranged in the installation groove, and the support protrusion is tapered towards the permanent magnet. Each rotor tooth is connected to the outer peripheral wall of the rotor yoke through a magnetic bridge.

[0017] In one embodiment, the rotor yoke is provided with the shaft hole. In the radial direction of the shaft hole, the height of the magnetic bridge is not less than the thickness of the rotor yoke.

[0018] And / or, in the radial direction of the shaft hole, the height of the magnetic bridge is L1, the height of the rotor tooth is L2, and L1 and L2 satisfy: 3.0 ≤ L2 / L1 ≤ 6.0.

[0019] In one embodiment, a groove is formed between two adjacent magnetic bridges and the rotor yoke, and the support protrusion is arranged at the bottom of the groove; in the radial direction of the rotor yoke, the height of the magnetic bridge is higher than the height of the support protrusion;

[0020] And / or, in the radial cross-section of the rotor core, the area of the groove is S1, the area of the support protrusion is S2, and S1 and S2 satisfy: 2 ≤ S1 / S2 ≤ 5.

[0021] The present utility model further provides a water purification device, and the water purification device includes the booster pump as described above.

[0022] The technical solution of the present utility model integrally injects the stator assembly and the plastic-sealed housing, thereby improving the reliability of the stator assembly and avoiding the potential safety hazard caused by the leakage of water from the pump head of the booster pump flowing into the motor. Moreover, the rotor assembly includes a rotor core and a plurality of permanent magnets. The rotor core has a shaft hole and a plurality of mounting grooves. One permanent magnet is correspondingly mounted in one mounting groove. A limiting groove is provided on the groove wall of the mounting groove, and at least part of the fixing member is disposed in the limiting groove and abuts against the permanent magnet to fix the permanent magnet in the mounting groove. With such a setting, the permanent magnet can be stably mounted in the mounting groove, ensuring the stability of the rotor assembly. Thus, it can be seen that the present utility model can improve the stability of the motor. The motor is connected to the pump head, and further can improve the stability of the booster pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following-described drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0024] Figure 1 Structural schematic diagram of an embodiment of the booster pump provided by the present utility model;

[0025] Figure 2 For Figure 1 Cross-sectional view of the booster pump in

[0026] Figure 3 For Figure 2 Structural schematic diagram of the rotor assembly of the motor in

[0027] Figure 4 For Figure 3 Structural schematic diagram of a partial structure in

[0028] Figure 5 For Figure 4 Structural schematic diagram of another perspective of the structure in

[0029] Figure 6 For Figure 5 Enlarged view of part A in

[0030] Figure 7 For Figure 5 Enlarged view of part B in

[0031] Figure 8 For Figure 4 Structural schematic diagram of another perspective of the structure in

[0032] Explanation of the reference numerals in the drawings:

[0033] 1. Boost pump;

[0034] 10. Pump head; 11. Water inlet; 12. Water outlet; 13. Eccentric wheel;

[0035] 20. Motor;

[0036] 100. Plastic-sealed housing; 110. Installation cavity;

[0037] 200. Stator assembly; 210. Stator core; 220. Stator winding;

[0038] 300. Rotor assembly; 310. Rotor core; 311. Rotor yoke; 311a. Shaft hole; 312. Rotor teeth; 312a. Through slot; 313. Installation slot; 313a. Slot opening; 313b. Limiting convex part; 314. Magnetic bridge; 315. Groove; 316. Support convex part; 316a. First end; 316b. Second end; 317. Installation gap; 318. Limiting slot; 320. Permanent magnet; 330. Rotating shaft; 340. Fixing part; 341. Plastic-sealed part.

[0039] The realization, functional features and advantages of the purpose of the present utility model will be further described in conjunction with embodiments with reference to the accompanying drawings. Specific embodiments

[0040] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0041] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) involved in the embodiments of the present utility model, the directional indications are only used to explain the relative position relationship and movement conditions between components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0042] In addition, if the descriptions such as "first" and "second" are involved in the embodiments of the present utility model, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, if "and / or" or "and / or" appears throughout the text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or the solution where A and B are satisfied simultaneously. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0043] As the core components of a motor, the stator and the rotor directly affect the performance and efficiency of the motor. In the existing motor structure, the stability of the stator and the rotor is poor, further reducing the stability of the booster pump using them. The present utility model can improve the stability of the existing booster pump.

[0044] Please refer to Figures 1 to 8 , in the embodiment of the present utility model, the booster pump 1 includes a pump head 10, a motor 20, and a fixing member 340. The motor 20 is connected to the pump head 10. The motor 20 includes a plastic-sealed housing 100, a stator assembly 200, and a rotor assembly 300. The plastic-sealed housing 100 forms an installation cavity 110. The stator assembly 200 is integrally injection-molded with the plastic-sealed housing 100. The rotor assembly 300 is disposed in the installation cavity 110 and cooperates with the stator assembly 200. The rotor assembly 300 includes a rotor core 310 and a plurality of permanent magnets 320. The rotor core 310 has a shaft hole 311a and a plurality of installation grooves 313. The plurality of installation grooves 313 are circumferentially spaced along the shaft hole 311a. One permanent magnet 320 is correspondingly installed in one installation groove 313. A limiting groove 318 is provided on the groove wall of the installation groove 313 (as Figure 6 shown); at least part of the fixing member 340 is disposed in the limiting groove 318 and abuts against the permanent magnet 320 to fix the permanent magnet 320 in the installation groove 313.

[0045] It can be understood that, as Figure 1As shown in the figure, the pump head 10 is provided with a water inlet 11 and a water outlet 12. A pumping component is also provided inside the pump head 10. The pumping component can be a diaphragm pump component. The eccentric wheel 13 of the pumping component is connected to the rotating shaft 330 of the motor 20. When the motor 20 operates, the rotating shaft 330 rotates to drive the pumping component to work, so as to achieve the function of pumping water. In this embodiment, the type of the motor 20 is a brushless motor. The brushless motor consists of a motor main body and a driver, and is a mechatronic product. Since the brushless motor operates in an automatic control mode, it will not, like a synchronous motor with heavy load starting under variable frequency speed regulation, have an additional starting winding on the rotor, nor will it generate oscillation and loss of step when the load changes suddenly. For the permanent magnets of small and medium-capacity brushless motors, high magnetic energy grade rare earth neodymium iron boron (Nd-Fe-B) materials are now mostly used. Therefore, the volume of the rare earth permanent magnet brushless motor is reduced by one frame number compared with that of a three-phase asynchronous motor of the same capacity, and the volume of the booster pump can be further reduced.

[0046] Compared with the brushed motor, the brushless motor removes the carbon brush. The most direct change is that there is no electric spark generated during the operation of the brushed motor, which greatly reduces the interference of the electric spark to the remote control radio equipment. At the same time, without the carbon brush, the friction during the operation of the brushless motor is greatly reduced, the operation is smooth, and the noise is much lower. Further, without the carbon brush, the wear of the brushless motor is mainly concentrated on the bearing. From a mechanical point of view, the brushless motor is almost a maintenance-free motor. When necessary, only some dust removal maintenance needs to be done, which is convenient for maintenance and has a long service life.

[0047] Further, the stator assembly 200 and the plastic-sealed housing 100 are injection-molded into one body. In this way, the live parts of the motor 20 can be plastic-sealed to form a closed whole, avoiding the occurrence of accidental failures. Moreover, it can also prevent the water leakage from the pump head 10 of the booster pump 1 from flowing into the motor 20 to cause potential safety hazards. Further, the stator assembly 200 includes a stator core 210 and a stator winding 220. After the gap between the stator core 210 and the stator winding 220 is filled with a material with excellent heat dissipation performance, it is beneficial to the heat dissipation of the motor 20, thereby improving the efficiency of the motor 20. An installation cavity 110 for installing the rotor assembly 300 is formed inside the plastic-sealed housing 100. The rotor assembly 300 is installed in the installation cavity 110 and cooperates with the stator assembly 200.

[0048] Further, a limiting groove 318 is provided on the groove wall of the installation groove 313. The limiting groove 318 can be semicircular, square, or other shapes, which are not specifically limited herein. Also, the specific position and quantity of the limiting groove 318 are not limited. A part of the fixing member 340 can be disposed in the limiting groove 318, and the other part can be disposed in the installation groove 313 and abutted against the permanent magnet 320; alternatively, a part can be disposed in the limiting groove 318, and the other part can be disposed outside the installation groove 313 and abutted against the permanent magnet 320; or, a part can be disposed in the limiting groove 318, a part can be disposed in the installation groove 313, and a part can be disposed outside the installation groove 313 and abutted against the permanent magnet 320. It is only necessary that the fixing member 340 can fix the permanent magnet 320 in the installation groove 313, and the quantity and position of the fixing member 340 are not limited.

[0049] In the technical solution of the present utility model, the stator assembly 200 and the plastic encapsulation housing 100 are injection-molded into one body, thereby improving the reliability of the stator assembly 200 and avoiding the safety hazard caused by the leakage of water from the pump head 10 of the booster pump 1 into the motor 20; and, the rotor assembly 300 includes a rotor core 310 and a plurality of permanent magnets 320. The rotor core 310 has a shaft hole 311a and a plurality of installation grooves 313. One permanent magnet 320 is correspondingly installed in one installation groove 313. A limiting groove 318 is provided on the groove wall of the installation groove 313. At least part of the fixing member 340 is disposed in the limiting groove 318 and abutted against the permanent magnet 320 to fix the permanent magnet 320 in the installation groove 313. With such a setting, the permanent magnet 320 can be stably installed in the installation groove 313, ensuring the stability of the rotor assembly 300. It can be seen that the present utility model can improve the stability of the motor 20. The motor 20 is connected to the pump head 10, and thus the stability of the booster pump 1 can be improved.

[0050] In an embodiment, along the width direction of the permanent magnet 320, the installation groove 313 has a first groove wall and a second groove wall which are oppositely arranged. The limiting grooves 318 are provided on both the first groove wall and the second groove wall. At least part of the fixing member 340 is disposed in the limiting grooves 318 on the first groove wall and the second groove wall and abutted against the opposite sides of the permanent magnet 320. With such a setting, that is, the fixing member 340 abuts against the opposite sides of the permanent magnet 320, so that the permanent magnet 320 can be centered in the installation groove 313. The centered permanent magnet 320 can ensure the symmetry and uniformity of the magnetic field, and can also more effectively utilize the magnetic flux, thereby improving the electromagnetic conversion efficiency of the motor 20.

[0051] In one embodiment, at least one of the limiting grooves 318 is provided on the first groove wall and / or the second groove wall. It can be understood that the number of the limiting grooves 318 on the first groove wall can be one, two, multiple, etc., which is not specifically limited herein; the number of the limiting grooves 318 on the second groove wall can be one, two, multiple, etc., which is not specifically limited herein, and it only needs to be able to stably fix the permanent magnet 320 in the installation groove 313. Specifically, in this solution, one limiting groove 318 is provided on both the first groove wall and the second groove wall, which is beneficial to simplify the structure.

[0052] In one embodiment, the limiting groove 318 is provided in the middle of the first groove wall and / or the second groove wall. It can be understood that the installation groove 313 is divided into three equal parts, namely the front, middle, and rear parts, along the radial direction of the shaft hole 311a. The limiting groove 318 is provided on the groove wall of the middle part of the installation groove 313, that is, in the middle of the first groove wall and / or the second groove wall. The middle part of the installation groove 313 is usually a region with less stress concentration. Setting the limiting groove 318 in this region is beneficial to evenly distribute mechanical stress and increase the structural stability of the rotor core 310; moreover, the limiting groove 318 is relatively evenly located in the middle of the groove wall of the installation groove 313, which is beneficial to reducing the generation of asymmetric magnetic fields caused by the skew of the permanent magnet, thereby being beneficial to reducing electromagnetic noise and vibration.

[0053] In one embodiment, the groove wall of the limiting groove 318 is arc-shaped. Such a setting not only facilitates the processing and forming of the limiting groove 318, but also is beneficial to increasing the contact area with the fixing member 340, thereby improving the installation stability of the fixing member 340. Of course, in other embodiments, the groove wall of the limiting groove 318 can also be flat, regular or irregular in shape, which is not specifically limited herein.

[0054] In one embodiment, the radian of the groove wall of the limiting groove 318 is R1, and the R1 satisfies: 0.1 mm ≤ R1 ≤ 0.5 mm. Such a setting makes the area of the limiting groove 318 smaller, easy to process, and is also beneficial to the miniaturization of the rotor core 310 and the motor 20, and correspondingly is also beneficial to the miniaturization of the booster pump 1. The value of R1 can be 0.1 mm, 0.15 mm, 0.2 mm, 0.25 mm, 0.3 mm, 0.35 mm, 0.4 mm, 0.45 mm, 0.5 mm, etc., which is not specifically limited herein.

[0055] In one embodiment, there is an installation gap 317 between the permanent magnet 320 and the groove wall of the installation groove 313, and at least part of the fixing member 340 is disposed in the limiting groove 318 and the installation gap 317 and abuts against the permanent magnet 320. It can be understood that by providing the installation gap 317, the permanent magnet 320 is easily installed in the installation groove 313, and the fixing member 340 is disposed in the limiting groove 318 and the installation gap 317 and abuts against the permanent magnet 320 to fix the permanent magnet 320 in the installation groove 313, thus ensuring the convenience and stability of the installation of the permanent magnet 320.

[0056] In one embodiment, the fixing member 340 includes a rivet, and the rivet is inserted into the limiting groove 318 and abuts against the permanent magnet 320. It can be understood that the permanent magnet 320 and the rotor core 310 are riveted together by the rivet, so that the permanent magnet 320 can be stably fixed in the installation groove 313, which is beneficial to improving the assembly efficiency and stability of the rotor core 310.

[0057] Please refer to Figure 3 , in one embodiment, the fixing member 340 includes a plastic sealing member 341, and the plastic sealing member 341 is filled in the limiting groove 318. The plastic sealing member 341 is injection-molded integrally to connect the rotor core 310 and the plurality of permanent magnets 320. It can be understood that the plastic sealing member 341 is integrally formed by injection molding to connect the rotor core 310 and the plurality of permanent magnets 320 into a whole, which is beneficial to improving the production efficiency and the stability of the rotor assembly 300 and reducing the production cost. The plastic sealing member 341 is an insulating member to have an insulating function. The plastic sealing member 341 is filled in the installation gap 317, which is beneficial to improving the connection strength between the rotor core 310 and the permanent magnet 320. Among them, the plastic sealing member 341 is made of a plastic material, and no specific limitation is made. In this embodiment, the plastic sealing member 341 includes polybutylene terephthalate (PBT) and glass fiber (GF), and the glass fiber is filled in the polybutylene terephthalate to have higher heat resistance, better tensile strength and bending strength to adapt to the normal operation of the motor 20 under different working conditions.

[0058] In one embodiment, the permanent magnet has a first side wall and a second side wall oppositely arranged along its width direction, and both the first side wall and the second side wall are spaced from the wall of the installation groove 313 to form the installation gap 317. It can be understood that the width of the installation gap 317 formed between the first side wall and the wall of the installation groove 313 is equal to or consistent with the width of the installation gap 317 formed between the second side wall and the wall of the installation groove 313. In this way, the permanent magnet can be centered in the installation groove 313. The centered permanent magnet 320 can ensure the symmetry and uniformity of the magnetic field, and can also make more effective use of the magnetic flux, thereby improving the electromagnetic conversion efficiency of the motor 20.

[0059] In one embodiment, the installation gap 317 is arranged with a uniform width along the length direction of the permanent magnet. With such an arrangement, the structure of the installation gap 317 is regular, that is, the structures of the installation groove 313 and the permanent magnet 320 are also regular, which is beneficial to ensuring the uniform distribution of the magnetic field around the rotor. Moreover, the uniform installation gap 317 can reduce the harmonic components in the magnetic field, thereby reducing the electromagnetic noise and loss during the operation of the motor 20, improving the efficiency and operation stability of the motor 20, and is also beneficial to simplifying the process and improving the machining accuracy of the installation groove 313.

[0060] Please refer to Figures 3 to 5 , in one embodiment, the installation groove 313 extends from the shaft hole 311a to the outer peripheral wall of the rotor core 310, so that a notch 313a is formed on the outer peripheral wall of the rotor core 310. The width of the notch 313a is W1, the width of the permanent magnet 320 is W2, and W1 and W2 satisfy: 0.2 ≤ W1 / W2 ≤ 0.8.

[0061] It can be understood that W1 is less than W2, that is, the width of the notch 313a of the installation groove 313 is less than the width of the permanent magnet 320, so that the permanent magnet 320 can be stably installed in the installation groove 313. At the same time, it is limited that the ratio of W1 to W2 is not less than 0.2 and not greater than 0.8, which optimizes the structure of the rotor core 310, is beneficial to the miniaturization of the rotor core 310, and is also beneficial to reducing magnetic flux leakage and eddy current loss, thereby improving the electromagnetic conversion efficiency of the motor 20. Moreover, the notch 313a on the outer peripheral wall of the rotor core 310 is beneficial to improving the heat dissipation performance of the rotor assembly 300. Thus, it can be seen that this solution can improve the performance and stability of the motor 20. The motor 20 is connected to the pump head 10, and further can improve the performance and stability of the booster pump 1.

[0062] Please refer to Figure 4 and Figure 5, in one embodiment, the rotor core 310 includes a rotor yoke 311 and a plurality of rotor teeth 312. The plurality of rotor teeth 312 are arranged at intervals along the circumferential direction of the rotor yoke 311 to form a plurality of mounting grooves 313. At the end of each rotor tooth 312 away from the rotor yoke 311, there is a limiting convex portion 313b extending towards the adjacent rotor tooth 312. The two limiting convex portions 313b on two adjacent rotor teeth 312 are arranged at intervals to form the notch 313a. The thickness of the limiting convex portion 313b in the radial direction of the rotor core 310 is W3, and the length of the permanent magnet 320 is W4. W3 and W4 satisfy: 0.02 ≤ W3 / W4 ≤ 0.2. With such a setting, the thickness of the limiting convex portion 313b at the notch 313a is relatively small compared to the length of the permanent magnet 320. By limiting the ratio of W3 to W4 to be not less than 0.02 and not greater than 0.2, the structure of the rotor core 310 is optimized, which is beneficial to the miniaturization of the rotor core 310. At the same time, it is also beneficial to reduce magnetic flux leakage and eddy current loss, thereby improving the electromagnetic conversion efficiency of the motor 20. The ratio of W3 to W4 can be, for example, 0.02, 0.05, 0.1, 1.5, 2.0, etc.

[0063] In one embodiment, W2 and W3 satisfy: 0.1 ≤ W3 / W2 ≤ 0.5. It can be understood that the ratio of W3 to W2 can be, for example, 0.1, 0.2, 0.3, 0.4, 0.5, etc., and specific values are not limited here. By limiting the ratio range of W3 to W2, the sizes of the notch 313a and the permanent magnet 320 are within a suitable range, which is not only beneficial to the miniaturization of the rotor core 310, but also beneficial to reducing magnetic flux leakage and eddy current loss, thereby improving the electromagnetic conversion efficiency of the motor 20.

[0064] In one embodiment, W3 satisfies: 0.3 mm ≤ W3 ≤ 2 mm; and / or, W4 satisfies: 10 mm ≤ W3 ≤ 20 mm. With such a setting, the thickness of the limiting convex portion 313b of the notch 313a is relatively small, and the length of the permanent magnet 320 is also relatively small, which is beneficial to the miniaturization of the rotor core 310, the miniaturization of the motor 20, and correspondingly beneficial to the miniaturization of the booster pump 1. The value of W3 can be 0.3 mm, 0.5 mm, 0.8 mm, 0.9 mm, 1.0 mm, 1.2 mm, 1.5 mm, 1.8 mm, 2.0 mm, etc., and the value of W4 can be 10 mm, 12 mm, 14 mm, 15 mm, 16 mm, 18 mm, 20 mm, etc., and specific values are not limited here.

[0065] In one embodiment, W1 satisfies: 1 mm ≤ W1 ≤ 3 mm; and / or, W2 satisfies: 3 mm ≤ W2 ≤ 8 mm. With such a setting, the width of the notch 313a is relatively small, and the width of the permanent magnet 320 is also relatively small, which is beneficial to the miniaturization of the rotor core 310, the miniaturization of the motor 20, and correspondingly, the miniaturization of the booster pump 1. The value of W1 can be 1 mm, 1.5 mm, 2 mm, 2.2 mm, 2.3 mm, 2.4 mm, 2.5 mm, 2.8 mm, 3.0 mm, etc., and the value of W2 can be 3 mm, 4 mm, 4.5 mm, 5 mm, 5.5 mm, 6 mm, 7 mm, 8 mm, etc., which are not specifically limited herein.

[0066] Please refer to Figure 7 , in one embodiment, along the width direction of the permanent magnet 320, the width of the installation gap 317 is W5, and W5 satisfies: 0.05 mm ≤ W5 ≤ 0.2 mm. With such a setting, the width of the installation gap 317 is relatively small. By limiting the width of the installation gap 317 to be not less than 0.05 mm and not greater than 0.2 mm, the structure of the rotor core 310 is optimized, which is beneficial to the miniaturization of the rotor core 310. At the same time, it is also beneficial to reduce magnetic flux leakage and eddy current loss, thereby improving the electromagnetic conversion efficiency of the motor 20. The value of W5 can exemplarily be 0.05 mm, 0.08 mm, 0.1 mm, 0.12 mm, 0.15 mm, 0.18 mm, 0.2 mm. In this embodiment, the widths of the installation gaps 317 formed by the first side wall and the second side wall of the permanent magnet 320 and the groove wall of the installation groove 313 in the installation groove 313 are equal and are both W5.

[0067] Please refer to Figures 3 to 5 , in one embodiment, the rotor core 310 includes a rotor yoke 311 and a plurality of rotor teeth 312. The plurality of rotor teeth 312 are arranged at intervals along the circumferential direction of the rotor yoke 311 to form a plurality of the installation grooves 313. At least one through groove 312a is formed in the rotor teeth 312, and the through groove 312a is exposed outside the plastic package 341.

[0068] It can be understood that at least one through groove 312a is formed in the rotor teeth 312. The extending direction of the through groove 312a is along the axial direction of the shaft hole 311a. The formation of the through groove 312a is beneficial to reducing the weight of the rotor teeth 312, and the through groove 312a is exposed outside the plastic package 341, further reducing the weight of the rotor assembly 300. Moreover, when the rotor assembly 300 rotates as a whole, the rotor teeth 312 have less inertia, thereby reducing the possibility that the magnetic bridge 314 connecting the rotor yoke 311 and the rotor teeth 312 is structurally damaged due to excessive inertia of the rotor teeth 312 during the rotation of the rotor assembly 300, and ensuring the structural integrity of the magnetic bridge 314 connecting the rotor yoke 311 and the rotor teeth 312.

[0069] Please refer to Figure 5 and Figure 8 In one embodiment, the rotor core 310 includes a rotor yoke 311 and a plurality of rotor teeth 312. The plurality of rotor teeth 312 are arranged at intervals along the circumferential direction of the rotor yoke 311. An installation groove 313 is formed between two adjacent rotor teeth 312. A support protrusion 316 is arranged in the installation groove 313. The support protrusion 316 is tapered towards the permanent magnet 320. Each rotor tooth 312 is connected to the outer peripheral wall of the rotor yoke 311 through a magnetic bridge 314.

[0070] It can be understood that the rotor assembly 300 further includes a rotating shaft 330, and the rotating shaft 330 is arranged in the shaft hole 311a of the rotor core 310. The rotor yoke 311 and the rotor teeth 312 are connected by the magnetic bridge 314, so that the plurality of rotor teeth 312 and the rotor yoke 311 rotate synchronously, further driving the rotating shaft 330 to rotate, so as to transmit the rotational power of the rotor core 310 to the rotating shaft 330, enabling the rotating shaft 330 to rotate, which is convenient for transmitting power outward by using the rotating shaft 330. The setting of the magnetic bridge 314 can improve the efficiency, stability and reliability of the motor 20. Specifically, the setting of the magnetic bridge 314 can improve the magnetic circuit and magnetic field distribution of the motor 20, thereby improving the efficiency and performance of the motor 20. The magnetic bridge 314 can help the magnetic field to be better concentrated on the magnetic circuit, reduce the leakage of the magnetic field, improve the magnetic permeability of the magnetic circuit, and make the magnetic field of the motor 20 more uniform and stable. By optimizing the magnetic circuit and magnetic field distribution, the motor 20 can achieve higher torque, lower energy consumption and more stable operation. The improvement of the performance and efficiency of the motor 20 can further improve the efficiency of the booster pump 1.

[0071] Furthermore, a support protrusion 316 is arranged in the installation groove 313, and the support protrusion 316 is tapered towards the permanent magnet 320. Regarding the support protrusion 316, it serves as one of the positions of the permanent magnet 320 in the installation groove 313 to ensure the accurate installation of the permanent magnet 320; and through the tapered setting of the support protrusion 316, it can not only reduce the weight of the rotor core 310, but also help reduce the leakage of the magnetic flux of the rotor core 310.

[0072] In one embodiment, in the axial direction of the rotor yoke 311, the length of the magnetic bridge 314 is the same as the length of the rotor yoke 311. Such a setting can reduce the magnetic flux leakage from the rotor core 310 through the magnetic bridge 314 to the rotor yoke 311, and at the same time, it will not affect the connection relationship between the magnetic bridge 314, the rotor yoke 311 and the rotor teeth 312, improving the connection stability among the three.

[0073] In one embodiment, in the circumferential direction of the rotor yoke 311, the width range of the magnetic bridge 314 is 0.3 mm - 0.8 mm. Specifically, limiting the width range of the magnetic bridge 314 between 0.3 mm and 0.8 mm can reduce the impedance of the magnetic circuit, making the magnetic flux more likely to pass through the magnetic circuit, thereby improving the magnetic permeability of the magnetic circuit of the motor 20, reducing the magnetic resistance, and improving the efficiency of the motor 20. In addition, it can also make the magnetic field more evenly distributed on the magnetic circuit, reduce the leakage of the magnetic field, and improve the magnetic field stability of the motor 2020. At the same time, it avoids the overall size of the motor 20 becoming larger due to an overly wide magnetic bridge 314, and also avoids the narrow magnetic bridge 314 being prone to breakage, which affects the connection between the magnetic bridge 314 and the rotor yoke 311 and the rotor teeth 312. The width of the magnetic bridge 314 can exemplarily be 0.3 mm, 0.35 mm, 0.4 mm, 0.45 mm, 0.5 mm, 0.55 mm, 0.6 mm, 0.65 mm, 0.7 mm, 0.75 mm, 0.8 mm.

[0074] Please refer to Figure 5 and Figure 8 , in one embodiment, the rotor yoke 311 is provided with the shaft hole 311a, and in the radial direction of the shaft hole 311a, the height of the magnetic bridge 314 is not less than the thickness of the rotor yoke 311. Specifically, a shaft hole 311a is formed in the middle of the rotor yoke 311 for installing the rotating shaft 330, and the center of the rotor yoke 311 coincides with the center of the shaft hole 311a. The thickness of the rotor yoke 311 refers to the distance between the wall surface of the shaft hole 311a of the rotor yoke 311 provided with the shaft hole 311a and the outer wall surface of the rotor yoke 311. Limiting the height of the magnetic bridge 314 to be greater than or equal to the thickness of the rotor yoke 311 can make the magnetic field more concentrated on the magnetic circuit, thereby improving the magnetic permeability of the magnetic circuit, reducing the magnetic resistance, and improving the efficiency of the motor 20.

[0075] On the other hand, the magnetic bridge 314 is used to connect the rotor yoke 311 and the rotor teeth 312. Such a setting facilitates reducing the occupied space of the magnetic bridge 314 while not affecting the connection relationship between the magnetic bridge 314 and the rotor yoke 311 and the rotor teeth 312, so as to reduce the magnetic flux leakage. In addition, reducing the occupied space of the magnetic bridge 314 is beneficial to increasing the occupied space of the rotor teeth 312, so as to increase the magnetic supply area of the permanent magnet 320 and improve the rotation efficiency of the rotor core 310.

[0076] It is considered here that a higher magnetic bridge 314 will increase the magnetic circuit length, thereby increasing the magnetic resistance and resulting in a longer magnetic flux path, which may reduce the efficiency of the motor 20; on the other hand, a higher magnetic bridge 314 will also affect the magnetic field distribution and magnetic flux density, affecting the performance of the motor 20. Therefore, in this embodiment, the height range of the magnetic bridge 314 is limited between 2.5 mm and 3.5 mm. In this way, the above problems can be avoided. The height of the magnetic bridge 314 can be exemplarily 2.5 mm, 2.6 mm, 2.7 mm, 2.8 mm, 2.9 mm, 3 mm, 3.1 mm, 3.2 mm, 3.3 mm, 3.4 mm, 3.5 mm.

[0077] Please refer to Figure 8 , in an embodiment, in the radial direction of the shaft hole 311a, the height of the magnetic bridge 314 is L1, and the height of the rotor tooth 312 is L2, and L1 and L2 satisfy: 3.0 ≤ L2 / L1 ≤ 6.0. Specifically, limiting the ratio of the height of the rotor tooth 312 to the height of the magnetic bridge 314 between 3.0 and 6.0 can, on the one hand, ensure the magnetic supply area of the permanent magnet 320 to improve the rotation efficiency of the rotor core 310, and on the other hand, increase the magnetic flux density, improve the output power of the motor 20, and at the same time reduce the magnetic leakage loss, thereby improving the efficiency and performance of the motor 20. The ratio of L2 to L1 can be exemplarily 3.0, 3.5, 4.0, 4.5, 5.0, 5.5, 6.0.

[0078] Please refer to Figure 8 , in an embodiment, a groove 315 is formed between two adjacent magnetic bridges 314 and the rotor yoke 311, and a support protrusion 316 is provided at the bottom of the groove 315. Specifically, the support protrusion 316 extends into the corresponding installation groove 313, facilitating the user to quickly position the permanent magnet 320 according to the support protrusion 316 so as to quickly and accurately install the permanent magnet 320 into the installation groove 313. The number of the support protrusions 316 in any one groove 315 can be one or more than one, and no specific limitation is made thereto. At the same time, the support protrusion 316 is connected to the bottom wall of the groove 315. On the one hand, it can improve the overall structural strength of the rotor core 310 and also facilitate the assembly of the rotor core 310 and the permanent magnet 320. On the other hand, by forming the groove 315, compared with the two magnetic bridges 314 being connected together, it is convenient to improve the magnetic leakage of the magnetic flux on the rotor core 310 passing through the magnetic bridge 314 to the rotor yoke 311 and reduce the weight of the rotor assembly 300.

[0079] In an embodiment, a groove 315 is formed between two adjacent magnetic bridges 314 and the rotor yoke 311, and a support protrusion 316 is provided at the bottom of the groove 315; in the radial direction of the rotor yoke 311, the height of the magnetic bridge 314 is higher than the height of the support protrusion 316. With such a setting, it is possible to reduce the occupied space of the support protrusion 316 without affecting the positioning of the permanent magnet 320 by the support protrusion 316, so as to reduce magnetic flux leakage. At the same time, such a setting facilitates leaving a larger space for the permanent magnet 320 to use, so as to increase the magnetic supply area of the permanent magnet 320 and facilitate improving the rotation efficiency of the rotor core 310.

[0080] Please refer to Figure 8 , in an embodiment, the two side edges of the support protrusion 316 have a first angle α, and the second angle between two adjacent magnetic bridges 314 is β, where 3α / 2 ≤ β ≤ 2α. Among them, the second angle between two adjacent magnetic bridges 314 is equal to the central angle corresponding to the rotor tooth 312, and the first angle is smaller than the central angle corresponding to the rotor tooth 312. In this embodiment, 10 installation grooves 313 are provided, that is, the corresponding number of magnetic poles is, at this time, the central angle corresponding to each magnetic pole is 36°, that is, β = 36°. When the first angle is 36°, the width of the second end 316b will be too large, which is not conducive to the miniaturization of the support protrusion 316. Therefore, the first angle α needs to be less than 36°. Of course, in other embodiments, the first angle α changes with the number of magnetic poles to adapt to and support the permanent magnet 320 in the corresponding installation groove 313, and the ratio of the first angle to the second angle can also be changed, which is not limited here.

[0081] Furthermore, α satisfies 15° ≤ α ≤ 25°. Specifically, in the radial direction of the rotor core 310, the support protrusion 316 has a first end 316a that abuts against the permanent magnet 320 located in the installation groove 313 and a second end 316b that connects to the rotor yoke 311. The support protrusion 316 is tapered towards the permanent magnet 320. By using the first end 316a of the support protrusion 316 to abut against the permanent magnet 320 and the second end 316b to connect to the rotor yoke 311, the permanent magnet 320 is stably installed in the installation groove 313 to ensure the efficiency of the motor 20. Among them, the support protrusion 316 is tapered as a whole towards the permanent magnet 320, which can, to a certain extent, reduce the occupied space of the support protrusion 316, reduce the overall weight of the rotor, and at the same time, reduce magnetic flux leakage, thereby effectively improving the efficiency and performance of the motor 20 on the basis of ensuring the reliable assembly of the permanent magnet 320 in the installation groove 313.

[0082] To facilitate meeting the tapered design of the supporting convex portion 316, the first angle can specifically be less than or equal to 25°, and the first angle α≥15°, which helps prevent the width of the first end 316a from being too small and affecting the structural stability of the supporting convex portion 316 at the first end 316a, and extends the service life of the supporting convex portion 316. Among them, the specific angles of the first angle α include but are not limited to 15°, 16°, 17°, 18°, 19°, 20°, 21°, 22°, 23°, 24°, 25°. In this embodiment, α = 20°.

[0083] In an embodiment, in the radial cross-section of the rotor core 310, the area of the groove 315 is S1, and the area of the supporting convex portion 316 is S2, and S1 and S2 satisfy: 2≤S1 / S2≤5.

[0084] It can be understood that due to the setting of the second angle, the cross-sectional shape of the groove 315 can specifically be approximately an isosceles trapezoid, and due to the setting of the first angle, the cross-sectional shape of the supporting convex portion 316 can specifically be approximately an isosceles trapezoid or even approximately an isosceles triangle. Therefore, limiting the cross-sectional area ratio of the groove 315 and the supporting convex portion 316 between 2 and 5 can, on the basis of ensuring the stable assembly of the permanent magnet 320 and the stable operation of the motor 20, reliably ensure that the supporting convex portion 316 occupies a small space, achieve the light weight of the rotor, and at the same time, reduce magnetic flux leakage and improve the efficiency and performance of the motor 20.

[0085] Please refer to Figure 8 , in an embodiment, in the radial direction of the rotor core 310, the supporting convex portion 316 has a first end 316a in contact with the permanent magnet 320 and a second end 316b connected to the rotor yoke 311. The width of the first end 316a is A1, and the width of the second end 316b is A2, and A1 and A2 satisfy: 0.2≤A1 / A2≤0.6.

[0086] It can be understood that by arranging the supporting convex portion 316 in the installation groove 313 of the rotor core 310, using the first end 316a of the supporting convex portion 316 to contact the permanent magnet 320 and the second end 316b to connect the rotor yoke 311, the permanent magnet 320 is stably installed in the installation groove 313 to ensure the efficiency of the motor 20. Among them, the supporting convex portion 316 is tapered as a whole towards the permanent magnet 320, and it is defined that the width A1 of the first end 316a and the width A2 of the second end 316b satisfy: 0.2≤A1 / A2≤0.6. Furthermore, on the basis of ensuring the reliable assembly of the permanent magnet 320 in the installation groove 313, the occupied space of the supporting convex portion 316 is reduced to a certain extent, the overall weight of the rotor is reduced, and at the same time, magnetic flux leakage is reduced, thereby effectively improving the efficiency and performance of the motor 20. The ratio of A1 to A2 can exemplarily be 0.2, 0.3, 0.4, 0.5, 0.6.

[0087] Further, on the basis of ensuring the assembly of the permanent magnet 320, the stress at the first end 316a of the support protrusion 316 can be reduced. That is, when the first end 316a is in direct contact with the radially inner end of the permanent magnet 320, since the effective contact area between the support protrusion 316 and the permanent magnet 320 is small, the generated stress is also small. Of course, in other embodiments, there is a gap between the first end 316a and the radially inner end of the permanent magnet 320, and the first end 316a can be indirectly connected and supported by the injection molding material injected into the gap. At this time, the support protrusion 316 can provide support for the injection molding material to ensure the injection molding and curing of the injection molding material for the rotor yoke 311, the rotor teeth 312 and the permanent magnet 320, and improve the overall structural strength of the rotor.

[0088] In one embodiment, in the radial cross-section of the rotor core 310, the sum of the areas Q1 of the permanent magnets 320 and the area Q2 of the rotor core 310 satisfy: 0.45 ≤ Q1 / Q2 ≤ 0.65. By setting it in this way, the number of permanent magnets 320 can be increased as much as possible on the limited rotor core 310, and the magnet filling rate can be increased, so as to improve the magnetic flux density and power density of the motor 20, and further help to improve the efficiency and performance of the motor 20. Further, in cooperation with the setting of 0.3 ≤ A1 / A2 ≤ 0.5, it is beneficial to further improve the efficiency and performance of the motor 20.

[0089] In one embodiment, the surface of the first end 316a facing the permanent magnet 320 is an arc surface. Compared with the surface being a plane, it can support the contact area between the protrusion 316 and the permanent magnet 320 as much as possible, which helps to reduce the stress at the first end 316a. At the same time, it ensures the stable installation of the permanent magnet 320 in the installation groove 313.

[0090] In one embodiment, there is one support protrusion 316 corresponding to the permanent magnet 320 and it is located on the center line of the rotor core 310, so as to improve the force uniformity of the permanent magnet 320 and ensure the stable installation of the permanent magnet 320.

[0091] In another embodiment, under the condition of meeting the light weight of the rotor, there are multiple support protrusions 316 corresponding to the permanent magnet 320 and they are symmetrically arranged about the center line of the rotor core 310 to ensure the uniform force of the permanent magnet 320 and improve the connection strength between the permanent magnet 320 and the rotor core 310.

[0092] In one embodiment, the material of the plastic encapsulation housing 100 is a non-metallic material. Further, the material of the plastic encapsulation housing 100 is BMC material. Specifically, the BMC material is the abbreviation of Bulk (Dough) molding compounds, that is, bulk molding compound, and is also called unsaturated polyester bulk molding compound. Its main raw materials are a dough-like prepreg formed by fully mixing GF (chopped glass fiber), UP (unsaturated resin), MD (filler calcium carbonate), and various additives.

[0093] The BMC material has the following performance aspects:

[0094] ① Excellent mechanical function: BMC products have excellent mechanical strength and stiffness, and their tensile strength and modulus are higher than those of general plastic materials. BMC products also have good wear resistance and impact function, and can replace traditional metal materials in mechanical design and manufacturing, achieving the effects of saving materials and reducing costs. ② Excellent heat resistance and adhesiveness: BMC products still have good mechanical properties and stability at high temperatures and can be used within the range of -20 degrees Celsius to 180 degrees Celsius. In addition, since BMC is a material that is thermoset cured in a mold, its surface adhesion function is also very good, and it can be used to manufacture some parts with complex shapes and high precision requirements. ③ Excellent corrosion resistance and barrier property: BMC products have good chemical corrosion resistance and can be used to manufacture some parts that need to contact corrosive substances such as acids and alkalis. In addition, the density and barrier function of BMC are also good, and it can be used to manufacture liquid storage containers such as fuel tanks and water tanks, achieving the effects of water impermeability, non-leakage, and anti-pollution. ④ Excellent electrical insulation and anti-electrocorrosion property: BMC products have excellent electrical insulation and anti-electrocorrosion properties and can be widely used in the fields of electrical appliances, electronics, and communications. The anti-electrocorrosion property of BMC also makes it an excellent coating material, which can replace traditional organic coatings, achieving the purpose of saving materials and improving the coating effect. ⑤ Simple manufacturing process and low cost: BMC products have a simple manufacturing process, high automation degree, high production efficiency and one-time forming rate, and can reduce manufacturing costs. BMC products can also be applied in various manufacturing processes such as mold injection molding and composite material forming, and can be applied to various complex parts and molds. Generally speaking, BMC products have the advantages of excellent mechanical properties, heat resistance, corrosion resistance, and outstanding electrical insulation, and can achieve the goals of energy conservation, emission reduction, cost reduction, and quality improvement.

[0095] The present utility model also proposes a water purification device, which includes the aforementioned booster pump 1. The specific structure of the booster pump 1 refers to the above-mentioned embodiment. Since this water purification device adopts all the technical solutions of the above-mentioned all embodiments, it at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, and will not be elaborated herein one by one. Among them, the water purification device is a water purifier, a water dispenser, a direct drinking machine, a water filter, etc.

[0096] The above are only exemplary embodiments of the present utility model, and do not limit the patent scope of the present utility model accordingly. Any equivalent structural transformation made under the technical concept of the present utility model by using the content of the specification and drawings of the present utility model, or any direct / indirect application in other related technical fields shall be included within the patent protection scope of the present utility model.

Claims

1. A booster pump, characterized in that: include: Pump head; A motor connected to the pump head, the motor comprising a plastic-encapsulated shell, a stator assembly and a rotor assembly, the plastic-encapsulated shell forming a mounting cavity, the stator assembly and the plastic-encapsulated shell being injection-molded as one, the rotor assembly being arranged in the mounting cavity and cooperating with the stator assembly; the rotor assembly comprising a rotor core and a plurality of permanent magnets, the rotor core having an axial hole and a plurality of mounting grooves, the plurality of mounting grooves being arranged at intervals along the circumference of the axial hole, one permanent magnet being correspondingly mounted in one mounting groove, and a limiting groove being provided on the groove wall of the mounting groove; and A fixing member, at least a portion of which is disposed in the limiting groove and abuts against the permanent magnet, so as to fix the permanent magnet in the installation groove.

2. The booster pump according to claim 1, characterized in that: Along the width direction of the permanent magnet, the mounting groove has a first groove wall and a second groove wall arranged opposite to each other, and the first groove wall and the second groove wall are both provided with the limiting groove, and at least part of the fixing member is arranged in the limiting groove on the first groove wall and the second groove wall and abuts against the opposite sides of the permanent magnet.

3. The booster pump according to claim 2, characterized in that: At least one of the limiting grooves is provided on the first groove wall and / or the second groove wall; And / or, the limiting groove is arranged in the middle of the first groove wall and / or the second groove wall.

4. The booster pump according to claim 1, characterized in that: The groove wall of the limiting groove is arranged in an arc shape; And / or, the curvature of the groove wall of the limiting groove is R1, and R1 satisfies: 0.1mm≤R1≤0.5mm.

5. The booster pump according to claim 1, characterized in that: An installation gap is provided between the permanent magnet and the groove wall of the installation groove, and at least a portion of the fixing member is disposed in the limiting groove and the installation gap and abuts against the permanent magnet.

6. The booster pump according to any one of claims 1 to 5, characterized in that: The fixing member comprises a rivet, which is inserted into the limiting groove and abuts against the permanent magnet; Alternatively, the fixing member includes a plastic sealing member, the limiting groove is filled with the plastic sealing member, and the plastic sealing member is injection-molded as a whole to connect the rotor core and the plurality of permanent magnets.

7. The booster pump according to any one of claims 1 to 5, characterized in that: The rotor core includes a rotor yoke and a plurality of rotor teeth, wherein the plurality of rotor teeth are arranged at intervals along the circumference of the rotor yoke, and a mounting groove is formed between two adjacent rotor teeth. A supporting protrusion is arranged in the mounting groove, and the supporting protrusion is gradually tapered toward the permanent magnet. Each of the rotor teeth is connected to the outer peripheral wall of the rotor yoke through a magnetic bridge.

8. The booster pump according to claim 7, characterized in that: The rotor yoke is provided with the shaft hole, and in the radial direction of the shaft hole, the height of the magnetic bridge is not less than the thickness of the rotor yoke; And / or, in the radial direction of the shaft hole, the height of the magnetic bridge is L1, the height of the rotor teeth is L2, and L1 and L2 satisfy: 3.0≤L2 / L1≤6.

0.

9. The booster pump according to claim 7, characterized in that: A groove is formed between two adjacent magnetic bridges and the rotor yoke, and the supporting protrusion is provided at the bottom of the groove; in the radial direction of the rotor yoke, the height of the magnetic bridge is higher than the height of the supporting protrusion; And / or, in the radial cross section of the rotor core, the area of ​​the groove is S1, the area of ​​the supporting protrusion is S2, and S1 and S2 satisfy: 2≤S1 / S2≤5.

10. A water purification device, characterized in that: Comprising a booster pump as claimed in any one of claims 1 to 9.

Images