Booster pump and water purification equipment

Abstract

The utility model discloses a booster pump and water purification equipment, and relates to the technical field of water purification, 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 core and permanent magnets, the rotor core comprises 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, and a mounting groove for mounting the permanent magnets is formed between every two adjacent rotor teeth; wherein the mounting grooves are internally provided with supporting convex parts, the supporting convex parts are arranged in a manner of gradually shrinking towards the permanent magnets, and each rotor tooth is connected with the peripheral wall of the rotor yoke through a magnetic bridge. According to the booster pump, the performance and efficiency of the motor in the 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] There is a magnetic leakage phenomenon in the motor rotor of the existing motor structure, and the magnetic conductivity of the magnetic circuit is poor, so that the efficiency and performance of the motor are poor, and further reduce the efficiency 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, aiming to improve the performance and efficiency of the motor in the booster pump.

[0004] To achieve the above object, the booster pump proposed by the utility model includes a pump head and a motor, the motor is connected to the pump head, and the motor includes a plastic sealed housing, a stator assembly and a rotor assembly; the plastic sealed housing forms an installation cavity, and the stator assembly is integrally injection molded with the plastic sealed housing; 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 permanent magnet, 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, and an installation groove for installing the permanent magnet is formed between two adjacent rotor teeth; wherein, a support convex part is arranged in the installation groove, the support convex part is tapered towards the permanent magnet, and each rotor tooth is connected to the outer peripheral wall of the rotor yoke through a magnetic bridge.

[0005] In an embodiment, in the axial direction of the rotor yoke, the length of the magnetic bridge is the same as the length of the rotor yoke.

[0006] In an embodiment, in the circumferential direction of the rotor yoke, the width range of the magnetic bridge is 0.3 mm - 0.8 mm.

[0007] In an embodiment, the rotor yoke is provided with a 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.

[0008] In an embodiment, in the radial direction of the rotor yoke, the height range of the magnetic bridge is 2.5 mm - 3.5 mm.

[0009] In an embodiment, in the radial direction of the rotor yoke, the height of the magnetic bridge is L1, and the height of the rotor tooth is L2, satisfying 3.8 ≤ L2 / L1 ≤ 5.2.

[0010] In an embodiment, a groove is formed between two adjacent magnetic bridges and the rotor yoke, and the support convex part is arranged on the bottom wall of the groove.

[0011] In one embodiment, in the radial direction of the rotor yoke, the height of the magnetic bridge is higher than the height of the support protrusion.

[0012] In one embodiment, both sides of the support protrusion have a first angle α, and the second angle between two adjacent magnetic bridges is β, where 3α / 2 ≤ β ≤ 2α.

[0013] In one embodiment, 15° ≤ α ≤ 25°.

[0014] In one embodiment, in the radial cross-section of the rotor core, the area of the groove is S1, and the area of the support protrusion is S2, where 2 ≤ S1 / S2 ≤ 5.

[0015] In one embodiment, in the radial direction of the rotor core, the support protrusion has a first end that abuts against the permanent magnet located in the mounting groove and a second end that connects to the rotor yoke. The width of the first end is A1, and the width of the second end is A2, where 0.3 ≤ A1 / A2 ≤ 0.5.

[0016] In one embodiment, the width of the permanent magnet is A3, and 5 ≤ A3 / A1 < 8.

[0017] In one embodiment, the surface of the first end facing the permanent magnet is an arc surface.

[0018] In one embodiment, there is one support protrusion corresponding to the permanent magnet, and it is located on the center line of the rotor core;

[0019] Alternatively, there are multiple support protrusions corresponding to the permanent magnet, and they are symmetrically arranged about the center line of the rotor core.

[0020] In one embodiment, the space between the rotor yoke and the rotor teeth is filled with injection molding plastic.

[0021] In one embodiment, the material of the plastic-sealed housing is BMC material.

[0022] The present utility model also provides a water purification device, which includes the booster pump. The booster pump includes a pump head and a motor. The motor is connected to the pump head. The motor includes a plastic encapsulated housing, a stator assembly, and a rotor assembly. The plastic encapsulated housing forms an installation cavity. The stator assembly is integrally injection molded with the plastic encapsulated housing. The rotor assembly is disposed in the installation cavity and cooperates with the stator assembly. The rotor assembly includes a rotor core and permanent magnets. The rotor core includes a rotor yoke and a plurality of rotor teeth. The plurality of rotor teeth are circumferentially spaced apart along the rotor yoke, and an installation groove for installing the permanent magnets is formed between two adjacent rotor teeth. Wherein, a support protrusion is disposed in the installation groove, the support protrusion is tapered towards the permanent magnet, and each rotor tooth is connected to the outer peripheral wall of the rotor yoke through a magnetic bridge.

[0023] In the technical solution of the present utility model, each rotor tooth of the rotor core in the motor structure of the booster pump is connected to the rotor yoke through a magnetic bridge. The setting of the magnetic bridge can improve the magnetic circuit and magnetic field distribution of the motor, thereby improving the efficiency and performance of the motor. At the same time, the magnetic bridge can help the magnetic field to be better concentrated 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 more uniform and stable. By optimizing the magnetic circuit and magnetic field distribution, the motor can achieve higher torque, lower energy consumption, and more stable operation. The improvement of the motor performance and efficiency can further improve the efficiency of the booster pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] 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 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 be obtained based on the structures shown in these drawings.

[0025] Figure 1 It is a schematic structural diagram of an embodiment of the booster pump provided by the present utility model;

[0026] Figure 2 is Figure 1 a cross-sectional view of the booster pump in

[0027] Figure 3 is Figure 1 a schematic diagram of the motor rotor assembly of the booster pump in

[0028] Figure 4 is Figure 3 a front view of the rotor assembly in

[0029] Explanation of the reference numerals in the drawings:

[0030] 1. Booster pump;

[0031] 10. Pump head; 11. Water inlet; 12. Water outlet; 13. Eccentric wheel;

[0032] 20. Motor; 100. Plastic sealed housing; 110. Installation cavity; 200. Stator assembly; 210. Stator core; 220. Stator winding; 300. Rotor assembly; 310. Rotor core; 311. Rotor yoke; 311a. Shaft hole; 312. Rotor teeth; 313. Installation groove; 314. Magnetic bridge; 315. Groove; 316. Support protrusion; 316a. First end; 316b. Second end; 320. Permanent magnet; 330. Rotating shaft.

[0033] The realization, functional features and advantages of the purpose of the present utility model will be further described in conjunction with the embodiments with reference to the accompanying drawings. Specific embodiments

[0034] 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. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0035] 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 positional relationship and movement conditions between components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0036] In addition, if there are descriptions involving "first", "second", etc. 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 of such features. 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, or solution B, or the solution where A and B are satisfied simultaneously. In addition, the technical solutions between the embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present utility model.

[0037] In the existing motor structure, there is a magnetic leakage phenomenon in the motor rotor, and the magnetic conductivity of the magnetic circuit is poor, resulting in poor efficiency and performance of the motor, and further reducing the efficiency of the booster pump using it. The utility model provides a booster pump, which can improve the performance and efficiency of the motor, thereby further improving the efficiency of the booster pump using it.

[0038] Please refer to Figure 1 and Figure 4 In an embodiment of the present utility model, the booster pump 1 includes a pump head 10 and a motor 20. The motor 20 is connected to the pump head 10. The 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 injection-molded with the plastic encapsulated housing 100 as a whole. The rotor assembly 300 is arranged in the installation cavity 110 and cooperates with the stator assembly 200. The rotor assembly 300 includes a rotor core 310 and a permanent magnet 320. 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, and an installation groove 313 for installing the permanent magnet 320 is formed between two adjacent rotor teeth 312. Wherein, each rotor tooth 312 is connected to the outer peripheral wall of the rotor yoke 311 through a magnetic bridge 314.

[0039] Specifically, please refer to Figure 2 By injection-molding the stator assembly 200 and the plastic encapsulated housing 100 as a whole, 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 of 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 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 and thus improves the efficiency of the motor 20. The plastic encapsulated housing 100 internally forms an installation cavity 110 for installing the rotor assembly 300. The rotor assembly 300 is installed in the installation cavity 110 and cooperates with the stator assembly 200.

[0040] Please refer to Figure 3, the rotor assembly 300 includes a rotor core 310 and permanent magnets 320. 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, and an installation groove 313 for installing the permanent magnets 320 is formed between two adjacent rotor teeth 312. The permanent magnets 320 are installed in the installation groove 313. Moreover, each rotor tooth 312 is connected to the outer peripheral wall of the rotor yoke 311 through a magnetic bridge 314. 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, thereby transmitting the rotational power of the rotor core 310 to the rotating shaft 330, enabling the rotating shaft 330 to rotate, and facilitating the transmission of power outward by using the rotating shaft 330.

[0041] The provision of the magnetic bridge 314 can improve the efficiency, stability, and reliability of the motor 20. Specifically, the provision of the magnetic bridge 314 can improve the magnetic circuit and magnetic field distribution of the motor 20, thereby enhancing 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 enhance the efficiency of the booster pump 1.

[0042] Please refer to Figure 1 , further, the pump head 10 is provided with a water inlet 11 and a water outlet 12, and a pumping assembly is further 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 rotor shaft of the motor 20. When the motor 20 operates, the rotation of the rotor shaft drives the pumping assembly to work to achieve the function of pumping water. In this embodiment, the type of the motor 20 is a brushless motor 20. The brushless motor 20 consists of a motor main body and a driver and is a typical mechatronic product. Since the brushless motor 20 operates in a self-controlled manner, it does not require an additional starting winding on the rotor like a synchronous motor 20 under heavy-load starting with variable-frequency speed regulation, nor does it generate oscillations and loss of synchronization when the load changes suddenly. For the permanent magnets 320 of medium and small-capacity brushless motors 20, high-magnetic-energy rare earth neodymium iron boron (Nd-Fe-B) materials are now mostly used. Therefore, the volume of the rare earth permanent magnet brushless motor 20 is reduced by one frame size compared to a three-phase asynchronous motor of the same capacity, which can further reduce the volume of the booster pump 1.

[0043] Compared with the brushed motor 20, the brushless motor 20 removes the brushes. The most direct change is the absence of the electric sparks generated during the operation of the brushed motor 20, which greatly reduces the interference of the electric sparks on the remote control radio equipment. At the same time, since the brushless motor 20 has no brushes, the friction during operation is greatly reduced, the operation is smooth, and the noise is much lower. Further, since the brushless motor 20 has no brushes, the wear of the brushless motor 20 is mainly concentrated on the bearings. From a mechanical perspective, the brushless motor 20 is almost a maintenance-free motor. When necessary, only some dust removal maintenance is required, which is convenient for maintenance and has a long service life.

[0044] Please refer to Figure 3 or Figure 4 , 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 is used 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 it helps to reduce the magnetic flux leakage of the rotor core 310 through the support protrusion 316 to the rotor yoke 311. Moreover, 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 radial 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 radial 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. Among them, the gap can be greater than or equal to 0.15 mm and less than or equal to 1 mm.

[0045] Please refer to Figure 3 , 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 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, and improve the connection stability among the three.

[0046] Please refer to Figure 3 or Figure 4, 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 20. 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, which affects 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, for example, 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.

[0047] Please refer to Figure 4 , in one embodiment, the rotor yoke 311 is provided with a shaft hole 311a. 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. The shaft hole 311a is used for installing the 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 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.

[0048] On the other hand, the magnetic bridge 314 is used to connect the rotor yoke 311 and the rotor teeth 312 together. Such a setting facilitates reducing the occupied space of the magnetic bridge 314 while not affecting the connection relationship between the magnetic bridge 314, 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.

[0049] 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 exemplarily be 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.

[0050] Please refer to Figure 4 , in an embodiment, in the radial direction of the rotor yoke 311, the height of the magnetic bridge 314 is L1, and the height of the rotor tooth 312 is L2, satisfying 3.8 ≤ L2 / L1 ≤ 5.2. Specifically, the ratio of the height of the rotor tooth 312 to the height of the magnetic bridge 314 is limited between 3.8 and 5.2. On the one hand, it can ensure the magnetic supply area of the permanent magnet 320 to improve the rotation efficiency of the rotor core 310. On the other hand, it can 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.

[0051] Please refer to Figure 3 or Figure 4 , 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 on the bottom wall of the groove 315. Specifically, the support protrusion 316 extends towards 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.

[0052] 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 rotor weight.

[0053] Please refer to Figure 4, Further, in the radial direction of the rotor yoke 311, the height of the magnetic bridge 314 is higher than that of the supporting convex portion 316. Setting the height of the supporting convex portion 316 to be less than that of the magnetic bridge 314 can reduce the occupied space of the supporting convex portion 316 without affecting the positioning of the permanent magnet 320 by the supporting convex portion 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.

[0054] Please refer to Figure 4 , In an embodiment, the two side edges of the supporting convex portion 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 less than the central angle corresponding to the rotor tooth 312. In this embodiment, there are 10 installation grooves 313, that is, the corresponding number of magnetic poles is 10. 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 supporting convex portion 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 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.

[0055] Further, α satisfies 15° ≤ α ≤ 25°. Specifically, in the radial direction of the rotor core 310, the supporting convex portion 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 supporting convex portion 316 is tapered towards the permanent magnet 320. Using the first end 316a of the supporting convex portion 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 supporting convex portion 316 is tapered towards the permanent magnet 320 as a whole, which can, to a certain extent, reduce the occupied space of the supporting convex portion 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.

[0056] To facilitate the implementation of the tapered design of the supporting convex portion 316, the first angle can be 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, affecting the structural stability of the supporting convex portion 316 at the first end 316a and extending 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°.

[0057] Please refer to Figure 4 , in an embodiment, on 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 2≤S1 / S2≤5.

[0058] It can be understood that due to the setting of the second angle, the cross-sectional shape of the groove 315 can be specifically approximately an isosceles trapezoid. Due to the setting of the first angle, the cross-sectional shape of the supporting convex portion 316 can be specifically 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, and cooperating with the above-mentioned relevant inequality limitations, on the basis of ensuring the stable assembly of the permanent magnet 320 and the stable operation of the motor 20, it can reliably ensure that the supporting convex portion 316 occupies a small space, achieving the light weight of the rotor. At the same time, it reduces the magnetic flux leakage and improves the efficiency and performance of the motor 20.

[0059] Please refer to Figure 4 , in an embodiment, in the radial direction of the rotor core 310, the supporting convex portion 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 the rotor yoke 311. The width of the first end 316a is A1, and the width of the second end 316b is A2, satisfying 0.3≤A1 / A2≤0.5.

[0060] Specifically, a supporting convex portion 316 is provided in the installation groove 313 of the rotor core 310. The first end 316a of the supporting convex portion 316 abuts against the permanent magnet 320, and the second end 316b connects the rotor yoke 311, so that the permanent magnet 320 is firmly installed in the installation groove 313, ensuring 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: 0.3≤A1 / A2≤0.5. 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, the magnetic flux leakage is reduced, thereby effectively improving the efficiency and performance of the motor 20.

[0061] In the radial cross-section of the rotor core 310, the sum Q1 of the areas of the permanent magnets 320 and the area Q2 of the rotor core 310 satisfy: 0.45 ≤ Q1 / Q2 ≤ 0.65, so as to increase the number of permanent magnets 320 as much as possible on the limited rotor, increase the magnet filling rate, thereby improving the magnetic flux density and power density of the motor 20, and further contributing to improving the efficiency and performance of the motor 20. Further, in combination with the setting of 0.3 ≤ A1 / A2 ≤ 0.5, it is beneficial to further improve the efficiency and performance of the motor 20.

[0062] Please refer to Figure 4 , in one embodiment, the width of the permanent magnet 320 is A3, and 5 ≤ A3 / A1 < 8. It can be understood that the width of the permanent magnet 320 is greater than the width of the first end 316a of the support protrusion 316. By defining 5 ≤ A3 / A1 < 8, on the basis of ensuring the support of the support protrusion 316 for the permanent magnet 320, the width of the first end 316a can be reduced as much as possible. Furthermore, the rotor weight is reduced, and the magnetic flux leakage from the rotor core 310 to the rotor yoke 311 through the support protrusion 316 is reduced, improving the efficiency and performance of the motor 20.

[0063] Specifically, when the ratio of A3 / A1 is too small, that is, A3 / A1 < 5, the width of the first end 316a is too large, and it is easy to cause large stress at the first end 316a due to the increased contact area with the permanent magnet 320, which is not conducive to the structural stability of the first end 316a and is also not conducive to the miniaturization of the support protrusion 316; when the ratio of A3 / A1 is too large, that is, A3 / A1 is greater than 8, the width of the first end 316a is too small, resulting in a reduced contact area between the support protrusion 316 and the permanent magnet 320, a low cooperation strength between the permanent magnet 320 and the rotor core 310, increasing the possibility of relative movement between the permanent magnet 320 and the rotor core 310, and being not conducive to ensuring the stable operation of the motor 20; therefore, the ratio of the width A3 of the permanent magnet 320 to the width A1 of the first end 316a is limited between 5 and 8 to ensure the stable assembly of the permanent magnet 320. At the same time, the occupied space of the support protrusion 316 in the rotor is effectively reduced, the weight of the rotor is reduced, and magnetic flux leakage is reduced, thereby effectively improving the efficiency and performance of the motor 20.

[0064] Specifically, the specific ratio of the width A3 of the permanent magnet 320 to the width A1 of the first end 316a includes but is not limited to 5, 5.5, 6, 6.1, 6.2, 6.3, 6.4, 6.5, 6.7, 6.8, 6.9, 7, 7.1, 7.2, 7.3, 7.4, 7.5, 7.6, 7.7, 7.8, 7.9, 8. Of course, in other embodiments, when the requirements of the user for the efficiency and performance of the motor 20100 can be met, this ratio can be greater than 8 or less than 5.

[0065] Please refer toFigure 3 or Figure 4 In one embodiment, the surface of the first end 316a facing the permanent magnet 320 is an arc surface. Compared with the case where the surface is a plane, it can support the contact area between the convex portion 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.

[0066] Please refer to Figure 4 In one embodiment, there is one support convex portion 316 corresponding to the permanent magnet 320, and it is located on the center line of the rotor core 310, which improves the force uniformity of the permanent magnet 320 and ensures the stable installation of the permanent magnet 320.

[0067] In another embodiment, when meeting the requirements of rotor light weight, there are multiple support convex portions 316 corresponding to the permanent magnet 320, and they are symmetrically arranged about the center line of the rotor core 310, which ensures the uniform force of the permanent magnet 320 and improves the connection strength between the permanent magnet 320 and the rotor core 310.

[0068] 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, which is convenient for the injection molding plastic to flow in and helps to improve 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 thus realizing the miniaturization and light weight of the motor 20.

[0069] Among them, the injection molding material includes PBT and glass fiber (GF) to have high heat resistance, good 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.

[0070] 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.

[0071] The BMC material has the following performance aspects:

[0072] ① Excellent mechanical properties: BMC products have excellent mechanical strength and stiffness, with both tensile strength and modulus 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 material saving and cost reduction. 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 °C to 180 °C. In addition, since BMC is a material that undergoes thermosetting curing 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, BMC also has good density and barrier properties and can be used to manufacture liquid storage containers such as fuel tanks and water tanks, achieving the effects of water impermeability, non-leakage, and pollution prevention. ④ Excellent electrical insulation and anti-electroerosion properties: BMC products have excellent electrical insulation and anti-electroerosion properties and can be widely used in the fields of electrical appliances, electronics, and communications. The anti-electroerosion property of BMC also makes it an excellent coating material, which can replace traditional organic coatings, achieving the goals of material saving and improved 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, which 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 suitable for various complex parts and molds.

[0073] Overall, 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 and emission reduction, cost reduction, and quality improvement.

[0074] In the technical solution of the present utility model, each rotor tooth 312 and rotor yoke 311 of the rotor core 310 in the motor 20 structure of the booster pump 1 are connected together by a magnetic bridge 314. 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. At the same time, 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 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.

[0075] The present utility model also provides a water purification device, which includes the aforementioned booster pump. The specific structure of the booster pump refers to the above-mentioned embodiments. Since this water purification device adopts all the technical solutions of the above-mentioned embodiments, it at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be elaborated one by one here. Among them, the water purification device is a water purifier, a water dispenser with built-in water purification function, a direct drinking machine or a water purifier, etc.

[0076] 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 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; and A motor is connected to the pump head, the motor comprising 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 piece; the rotor assembly is arranged in the mounting cavity and cooperates with the stator assembly; the rotor assembly comprises a rotor core and a permanent magnet, the rotor core comprises a rotor yoke and a plurality of rotor teeth, the plurality of rotor teeth are arranged at intervals along the circumference of the rotor yoke, and a mounting groove for mounting the permanent magnet is formed between two adjacent rotor teeth; wherein a supporting protrusion is arranged in the mounting groove, the supporting protrusion is gradually arranged toward the permanent magnet, and each of the rotor teeth is connected to the outer peripheral wall of the rotor yoke through a magnetic bridge.

2. The booster pump according to claim 1, characterized in that: In the axial direction of the rotor yoke, the length of the magnetic bridge is consistent with the length of the rotor yoke.

3. The booster pump according to claim 1, characterized in that: In the circumferential direction of the rotor yoke, the width of the magnetic bridge ranges from 0.3 mm to 0.8 mm.

4. The booster pump according to claim 1, characterized in that: The rotor yoke is provided with a 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.

5. The booster pump according to claim 4, characterized in that: In the radial direction of the rotor yoke, the height of the magnetic bridge ranges from 2.5 mm to 3.5 mm.

6. The booster pump according to claim 1, characterized in that: In the radial direction of the rotor yoke, the height of the magnetic bridge is L1, and the height of the rotor teeth is L2, satisfying 3.8≤L2 / L1≤5.

2.

7. The booster pump according to claim 1, characterized in that: A groove is formed between two adjacent magnetic bridges and the rotor yoke, and the bottom wall of the groove is provided with the supporting protrusion.

8. The booster pump according to claim 7, characterized in that: In the radial direction of the rotor yoke, the height of the magnetic bridge is higher than the height of the supporting protrusion.

9. The booster pump according to claim 7, characterized in that: Both side edges of the supporting protrusion have a first angle α, and a second angle between two adjacent magnetic bridges is β, 3α / 2≤β≤2α.

10. The booster pump according to claim 9, characterized in that: 15°≤α≤25°。 11. The booster pump according to claim 9, characterized in that: 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 2≤S1 / S2≤5.

12. The booster pump according to claim 1, characterized in that: In the radial direction of the rotor core, the supporting protrusion has a first end that abuts against the permanent magnet in the mounting groove 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 0.3≤A1 / A2≤0.5 is satisfied.

13. The booster pump according to claim 12, characterized in that: The width of the permanent magnet is A3, and 5≤A3 / A1<8.

14. The booster pump according to claim 12, characterized in that: The surface of the first end facing the permanent magnet is a curved surface.

15. The booster pump according to claim 1, characterized in that: The supporting protrusion is provided with one corresponding to the permanent magnet and is located at the center line of the rotor core; Alternatively, a plurality of the supporting protrusions are provided corresponding to the permanent magnets and are symmetrically arranged about a center line of the rotor core.

16. The booster pump according to claim 1, characterized in that: The space between the rotor yoke and the rotor teeth is filled with injection molding glue.

17. The booster pump according to claim 1, characterized in that: The plastic-sealed housing is made of BMC material.

18. A water purification device, characterized in that: Comprising a booster pump as claimed in any one of claims 1 to 17.

Images