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 and a motor, 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 mounting grooves are arranged at intervals in the circumferential direction of the shaft hole, one permanent magnet is correspondingly mounted in one mounting groove, each mounting groove extends from the shaft hole to the outer circumferential wall of the rotor iron core, a notch is formed in the outer circumferential wall of the rotor iron core, the width of the notch is W1, and the width of the notch is W2. The width of the permanent magnet is W2, and the W1 and the W2 meet the condition that W1 / W2 is larger than or equal to 0.2 and smaller than or equal to 0.8. Performance and 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 an electric motor, the design of the stator and the rotor directly affects the performance and efficiency of the electric motor. The performance of the stator and the rotor in the existing electric motor structure is poor, which further reduces the performance and stability of the booster pump using it. Summary of the Utility Model

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

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

[0005] A pump head; and

[0006] An electric motor connected to the pump head, the electric 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, one permanent magnet is correspondingly installed in one installation groove, and each installation groove extends from the shaft hole to the outer peripheral wall of the rotor core, so as to form a notch on the outer peripheral wall of the rotor core, the width of the notch is W1, the width of the permanent magnet is W2, and W1 and W2 satisfy: 0.2 ≤ W1 / W2 ≤ 0.8.

[0007] 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 to form a plurality of installation grooves, and a limiting convex portion extending towards an adjacent rotor tooth is provided at an end of each rotor tooth away from the rotor yoke, and the two limiting convex portions on two adjacent rotor teeth are arranged at intervals to form the notch, the thickness of the limiting convex portion along the radial direction of the rotor core is W3, the length of the permanent magnet is W4, and W3 and W4 satisfy: 0.02 ≤ W3 / W4 ≤ 0.2.

[0008] In one embodiment, W2 and W3 satisfy: 0.1 ≤ W3 / W2 ≤ 0.5.

[0009] In one embodiment, W3 satisfies: 0.3 mm ≤ W3 ≤ 2 mm;

[0010] And / or, W4 satisfies: 10 mm ≤ W3 ≤ 20 mm.

[0011] In one embodiment, W1 satisfies: 1 mm ≤ W1 ≤ 3 mm;

[0012] And / or, W2 satisfies: 3 mm ≤ W2 ≤ 8 mm.

[0013] 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. 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.

[0014] 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;

[0015] 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.

[0016] In one embodiment, a groove is formed between two adjacent magnetic bridges and the rotor yoke. 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;

[0017] 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.

[0018] In one embodiment, in the radial direction of the rotor core, the support protrusion has a first end in contact with the permanent magnet and a second end connected to the rotor yoke. The width of the first end is A1, the width of the second end is A2, and A1 and A2 satisfy: 0.2 ≤ A1 / A2 ≤ 0.6.

[0019] The present utility model also proposes a water purification device, and the water purification device includes the booster pump as described above.

[0020] The technical solution of the present utility model integrally injects the stator assembly and the plastic housing, thereby improving the reliability of the stator assembly and avoiding potential safety hazards caused by water leakage 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 installed in one mounting groove. Each mounting groove extends from the shaft hole to the outer peripheral wall of the rotor core, so that a notch is formed on the outer peripheral wall of the rotor core. The width of the notch is W1, and the width of the permanent magnet is W2. W1 and W2 satisfy: 0.2 ≤ W1 / W2 ≤ 0.8, that is, W1 is less than W2, which means the width of the notch of the mounting groove is less than the width of the permanent magnet, so that the permanent magnet can be stably installed in the mounting groove. At the same time, it is specified that the ratio of W1 to W2 is not less than 0.2 and not greater than 0.8, optimizing the structure of the rotor core, which is beneficial to reducing magnetic flux leakage and eddy current loss, thereby improving the electromagnetic conversion efficiency of the motor. Moreover, the notches on the outer peripheral wall of the rotor core are beneficial to improving the heat dissipation performance of the rotor assembly. Thus, it can be seen that the present utility model can improve the performance and stability of the motor. The motor is connected to the pump head, and further, the performance and stability of the booster pump can be improved. Description of the Drawings

[0021] 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 drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on the structures shown in these drawings.

[0022] Figure 1 Structural schematic diagram of an embodiment of the booster pump provided by the present utility model;

[0023] Figure 2 For Figure 1 Cross-sectional view of the booster pump in

[0024] Figure 3 For Figure 2 Structural schematic diagram of the rotor assembly of the motor in

[0025] Figure 4 For Figure 3 Structural schematic diagram of the rotor assembly from another perspective in

[0026] Figure 5 For Figure 3 Structural schematic diagram of the rotor assembly from another perspective in

[0027] Explanation of the reference numerals in the drawings:

[0028] 1. Booster pump;

[0029] 10. Pump head; 11. Water inlet; 12. Water outlet; 13. Eccentric wheel;

[0030] 20. Motor;

[0031] 100. Plastic-sealed housing; 110. Installation cavity;

[0032] 200. Stator assembly; 210. Stator core; 220. Stator winding;

[0033] 300. Rotor assembly; 310. Rotor core; 311. Rotor yoke; 311a. Shaft hole; 312. Rotor teeth; 313. Installation groove; 313a. Groove opening; 313b. Limiting convex part; 314. Magnetic bridge; 315. Groove; 316. Support convex part; 316a. First end; 316b. Second end; 320. Permanent magnet; 330. Rotating shaft.

[0034] The realization, functional features and advantages of the purpose of the present utility model will be further described with reference to the embodiments and the accompanying drawings. Detailed implementation manners

[0035] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described with reference to 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 making creative efforts belong to the scope of protection of the present utility model.

[0036] 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.

[0037] In addition, if descriptions such as "first", "second", etc. are involved in the embodiments of the present utility model, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be construed as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first", "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 scenarios. Taking "A and / or B" as an example, it includes scenario A, or scenario B, or the scenario where both A and B are satisfied simultaneously. In addition, the technical solutions between the 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.

[0038] As the core components of an electric motor, the stator and rotor directly affect the performance and efficiency of the electric motor. The performance of the stator and rotor in the existing electric motor structure is poor, which further reduces the performance and stability of the booster pump using it. The present utility model can improve the performance and stability of the existing booster pump.

[0039] Please refer to Figures 1 to 5 , in an embodiment of the present utility model, the booster pump 1 includes a pump head 10 and an electric motor 20. The electric motor 20 is connected to the pump head 10. The electric motor 20 includes a plastic-encapsulated housing 100, a stator assembly 200, and a rotor assembly 300. The plastic-encapsulated housing 100 forms an installation cavity 110. The stator assembly 200 is integrally injection-molded with the plastic-encapsulated 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. Each installation groove 313 extends from the shaft hole 311a to the outer peripheral wall of the rotor core 310, so as to form a notch 313a on the outer peripheral wall of the rotor core 310. The width of the notch 313a is W1, and the width of the permanent magnet 320 is W2. W1 and W2 satisfy: 0.2 ≤ W1 / W2 ≤ 0.8.

[0040] It can be understood that as Figure 1As shown, the pump head 10 is provided with a water inlet 11 and a water outlet 12. A pumping assembly is also provided inside the pump head 10. The pumping assembly can be a diaphragm pump assembly. The eccentric wheel 13 of the pumping assembly 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 assembly 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 add an additional starting winding on the rotor like a synchronous motor under variable frequency speed regulation with heavy load starting, nor will it generate oscillation and loss of step when the load changes suddenly. For the permanent magnet 320 of small and medium-capacity brushless motors, rare earth neodymium iron boron (Nd-Fe-B) materials with high magnetic energy levels are mostly used. Therefore, the volume of the rare earth permanent magnet brushless motor is reduced by one frame size compared with a three-phase asynchronous motor of the same capacity, and the volume of the booster pump 1 can be further reduced.

[0041] Compared with a 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 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 bearings. From a mechanical perspective, the brushless motor is almost a maintenance-free motor. When necessary, only some dust removal maintenance needs to be done, and it is convenient to repair and has a long service life.

[0042] Further, the stator assembly 200 and the plastic encapsulation housing 100 are injection-molded into one body. In this way, the live parts of the motor 20 can be plastic-encapsulated to form a sealed 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 and causing potential safety hazards. Further, the stator assembly 200 includes a stator core 210 and a stator winding 220. After the gap between the stator assembly 200 and the plastic encapsulation housing 100 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 encapsulation housing 100. The rotor assembly 300 is installed in the installation cavity 110 and cooperates with the stator assembly 200.

[0043] The technical solution of the present utility model integrally injects the stator assembly 200 and the plastic-sealed housing 100, thereby improving the reliability of the stator assembly 200 and avoiding potential safety hazards caused by water leakage from the pump head 10 of the booster pump 1 flowing into the motor 20. Moreover, 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 mounting grooves 313. One permanent magnet 320 is correspondingly mounted in one mounting groove 313. Each mounting groove 313 extends from the shaft hole 311a towards 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, and the width of the permanent magnet 320 is W2. W1 and W2 satisfy: 0.2 ≤ W1 / W2 ≤ 0.8. The ratio of W1 to W2 can exemplarily be 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8. With such a setting, that is, W1 is less than W2, which means the width of the notch 313a of the mounting groove 313 is less than the width of the permanent magnet 320, so that the permanent magnet 320 can be stably mounted in the mounting groove 313. At the same time, it is defined that the ratio of W1 to W2 is not less than 0.2 and not greater than 0.8, optimizing the structure of the rotor core 310, being beneficial to the miniaturization of the rotor core 310, and also being 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 the present utility model 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.

[0044] Please refer to Figure 3 and Figure 4, 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 defining that the ratio of W3 to W4 is 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.

[0045] 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 defining 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.

[0046] 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. Thus, it is beneficial to the miniaturization of the rotor core 310, the miniaturization of the motor 20, and correspondingly, it is also 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.

[0047] 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 conducive 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.

[0048] 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. 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.

[0049] 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 better concentrate on the magnetic circuit, reduce the leakage of the magnetic field, improve the magnetic conductivity 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.

[0050] Further, a support protrusion 316 is provided in the installation groove 313, and the support protrusion 316 is tapered towards the permanent magnet 320. Regarding the support protrusion 316, the support protrusion 316 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, not only can the weight of the rotor core 310 be reduced, but also the leakage of the magnetic flux of the rotor core 310 can be reduced.

[0051] In an 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 of the rotor core 310 passing 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.

[0052] In an 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 easily 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 magnetic bridge 314 being too narrow and easily breaking, affecting the connection between the magnetic bridge 314, the rotor yoke 311, and the rotor teeth 312. The width of the magnetic bridge 314 can be exemplarily 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.

[0053] Please refer to Figure 4 and Figure 5 , in an 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 provided 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.

[0054] On the other hand, the magnetic bridge 314 is used to connect the rotor yoke 311 and the rotor tooth 312. Such a setting facilitates reducing the occupied space of the magnetic bridge 314 while not affecting the connection relationship between the rotor yoke 311 and the rotor tooth 312, so as to reduce magnetic flux leakage. In addition, reducing the occupied space of the magnetic bridge 314 is beneficial to increasing the occupied space of the rotor tooth 312, so as to increase the magnetic supply area of the permanent magnet 320 and improve the rotation efficiency of the rotor core 310.

[0055] It is considered here that a higher magnetic bridge 314 will increase the magnetic circuit length, thereby increasing the magnetic resistance and causing the magnetic flux path to become longer, 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.

[0056] Please refer to Figure 5 , 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.

[0057] Please refer to Figure 5, 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, due to the formation of the groove 315, compared with the two magnetic bridges 314 being connected together, it is convenient to improve the magnetic flux 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.

[0058] 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, the occupied space of the support protrusion 316 can be reduced without affecting the positioning of the permanent magnet 320 by the support protrusion 316 so as to reduce the magnetic flux leakage. At the same time, such a setting is convenient to leave 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.

[0059] Please refer to Figure 5 , 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, 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 change of the number of magnetic poles so as to adapt to and support the permanent magnet 320 in the corresponding installation groove 313, and the ratio of the first angle and the second angle can also be changed, and no limitation is made here.

[0060] Further, 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 mounting 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 mounting groove 313, ensuring 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, while reducing 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 mounting groove 313.

[0061] To facilitate the tapered design of the support protrusion 316, the first angle is specifically less than or equal to 25°, and the first angle α ≥ 15°, which helps to prevent the width of the first end 316a from being too small and affecting the structural stability of the support protrusion 316 at the first end 316a, and extending the service life of the support protrusion 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°.

[0062] 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 support protrusion 316 is S2. The S1 and S2 satisfy: 2 ≤ S1 / S2 ≤ 5. It can be understood that due to the setting of the second angle, the cross-sectional shape of the groove 315 can be approximately an isosceles trapezoid, and due to the setting of the first angle, the cross-sectional shape of the support protrusion 316 can be approximately an isosceles trapezoid or even approximately an isosceles triangle. Therefore, limiting the cross-sectional area ratio of the groove 315 and the support protrusion 316 between 2 and 5 can reliably ensure that the support protrusion 316 occupies a small space, achieves the lightweight of the rotor, while reducing magnetic flux leakage and improving the efficiency and performance of the motor 20 on the basis of ensuring the stable assembly of the permanent magnet 320 and the stable operation of the motor 20.

[0063] Please refer to Figure 5 , in an embodiment, 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 and a second end 316b that connects to the rotor yoke 311. The width of the first end 316a is A1, and the width of the second end 316b is A2. The A1 and A2 satisfy: 0.2 ≤ A1 / A2 ≤ 0.6.

[0064] It can be understood that a support protrusion 316 is provided in the installation groove 313 of the rotor core 310. The first end 316a of the support protrusion 316 abuts against the permanent magnet 320, and the second end 316b is connected to the rotor yoke 311, so that the permanent magnet 320 is stably installed in the installation groove 313, ensuring the efficiency of the motor 20. Among them, the support protrusion 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 support protrusion 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 be exemplarily 0.2, 0.3, 0.4, 0.5, 0.6.

[0065] Furthermore, 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 directly abuts against 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, improving the overall structural strength of the rotor.

[0066] In one embodiment, on 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 like this, the number of permanent magnets 320 is increased as much as possible on the limited rotor core 310, and the magnet filling rate is increased, so as to improve the magnetic flux density and power density of the motor 20, and further contribute to improving the efficiency and performance of the motor 20. Furthermore, 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.

[0067] 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 maximize the contact area between the support protrusion 316 and the permanent magnet 320, help reduce the stress at the first end 316a, and at the same time, ensure the stable installation of the permanent magnet 320 in the installation groove 313.

[0068] In one embodiment, there is one support convex portion 316 provided corresponding to the permanent magnet 320 and located on the center line of the rotor core 310, thus improving the force uniformity on the permanent magnet 320 and ensuring the stable installation of the permanent magnet 320.

[0069] In another embodiment, when meeting the requirements of rotor light weight, there are multiple support convex portions 316 provided corresponding to the permanent magnet 320 and symmetrically arranged with respect to the center line of the rotor core 310, ensuring the uniform force on the permanent magnet 320 and improving the connection strength between the permanent magnet 320 and the rotor core 310.

[0070] In one embodiment, injection molding plastic is filled between the rotor yoke 311 and the rotor teeth 312. At this time, an injection molding space for the injection molding plastic to flow in is formed between the groove wall of the groove 315 and the outer peripheral surface of the support convex portion 316, facilitating the inflow of the injection molding plastic and being conducive to improving the connection strength between the rotor core 310 and the permanent magnet 320. At the same time, compared with using additional fasteners to fix the whole rotor, the setting of the injection molding plastic is beneficial to reducing the volume of the rotor, and further realizing the miniaturization and light weight of the motor 20. Among them, the injection molding material includes polybutylene terephthalate (PBT) filled with glass fiber, that is, it includes PBT and glass fiber (GF), so as 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. Further, the injection molding plastic is arranged on the outer periphery of the rotor, which helps to improve the connection strength between the rotor core 310 and the permanent magnet 320.

[0071] 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.

[0072] The BMC material has the following performance aspects:

[0073] ① Excellent mechanical properties: 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 resistance, 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 adhesion: BMC products still have good mechanical properties and stability at high temperatures and can be used in the range of -20 °C to 180 °C. In addition, since BMC is a material that cures thermosetting in a mold, its surface adhesion 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 properties: 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 properties 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-electro-erosion properties: BMC products have excellent electrical insulation and anti-electro-erosion properties and can be widely used in the fields of electrical appliances, electronics, and communications. The anti-electro-erosion 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: The manufacturing process of BMC products is simple, with a high degree of automation, 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, good heat resistance, corrosion resistance, and electrical insulation, and can achieve the goals of energy conservation, emission reduction, cost reduction, and quality improvement.

[0074] The present utility model also provides a water purification device, which includes the aforementioned booster pump 1. The specific structure of the booster pump 1 refers to the above-mentioned embodiments. Since this water purification device adopts all the technical solutions of the above-mentioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which 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 purifier, or the like.

[0075] The above is only an exemplary embodiment of the present utility model and does not limit the patent scope of the present utility model. 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 is included in the patent protection scope of the present utility model.

Claims

1. A booster pump, characterized in that: include: Pump head; as well as A motor is connected to the pump head, the motor includes a plastic-encapsulated shell, a stator assembly and a rotor assembly; the plastic-encapsulated shell is formed with a mounting cavity, the stator assembly and the plastic-encapsulated shell are injection-molded as one; the rotor assembly is arranged in the mounting cavity and cooperates with the stator assembly; the rotor assembly includes a rotor core and a plurality of permanent magnets, the rotor core has an axial hole and a plurality of mounting grooves, the plurality of mounting grooves are arranged at intervals along the circumference of the axial hole, one permanent magnet is correspondingly mounted in one mounting groove, each mounting groove extends from the axial hole to the outer peripheral wall of the rotor core to form a notch on the outer peripheral wall of the rotor core, the width of the notch is W1, the width of the permanent magnet is W2, and W1 and W2 satisfy: 0.2≤W1 / W2≤0.

8.

2. The booster pump according to claim 1, 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 circumferential direction of the rotor yoke to form a plurality of mounting grooves, and an end of each rotor tooth away from the rotor yoke is provided with a limiting protrusion extending toward an adjacent rotor tooth, and the two limiting protrusions on two adjacent rotor teeth are arranged at intervals to form the notch, and the thickness of the limiting protrusion along the radial direction of the rotor core is W3, and the length of the permanent magnet is W4, and W3 and W4 satisfy: 0.02≤W3 / W4≤0.

2.

3. The booster pump according to claim 2, characterized in that: W2 and W3 satisfy: 0.1≤W3 / W2≤0.

5.

4. The booster pump according to claim 2, characterized in that: The W3 satisfies: 0.3mm≤W3≤2mm; And / or, W4 satisfies: 10mm≤W3≤20mm.

5. The booster pump according to claim 1, characterized in that: The W1 satisfies: 1mm≤W1≤3mm; And / or, W2 satisfies: 3mm≤W2≤8mm.

6. 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.

7. The booster pump according to claim 6, 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.

8. The booster pump according to claim 6, 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.

9. The booster pump according to claim 6, characterized in that: In the radial direction of the rotor core, the supporting protrusion has a first end abutting against the permanent magnet and a second end connected to the rotor yoke, the width of the first end is A1, the width of the second end is A2, and A1 and A2 satisfy: 0.2≤A1 / A2≤0.

6.

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

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