Booster pump

Abstract

The utility model discloses a booster pump, which relates to the technical field of booster pumps and comprises a pump head and a motor. The motor is connected with the pump head, the motor comprises a rotor iron core, the rotor iron core comprises a rotor yoke and a plurality of rotor teeth arranged on the periphery of the rotor yoke, and a mounting groove is formed between every two adjacent rotor teeth and the rotor yoke; wherein a mounting groove is formed in the rotor core, a supporting convex part is arranged in the mounting groove, in the radial direction of the rotor core, the supporting convex part is provided with a first end and a second end, the first end abuts against a permanent magnet located in the mounting groove, the second end is connected with the rotor yoke, the supporting convex part is gradually shrunk towards the permanent magnet, the width of the first end is A1, the width of the second end is A2, and A1 / A2 is larger than or equal to 0.3 and smaller than or equal to 0.5; according to the technical scheme provided by the utility model, the weight of the rotor can be reduced, and meanwhile, the mounting stability of the permanent magnets is improved.

Description

Technical Field

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

[0002] In the related art, in order to ensure the target installation position of the permanent magnet on the rotor, the rotor core is wrapped around the outer periphery of the permanent magnet to ensure the accuracy of the installation position. However, this easily increases the overall weight of the rotor and affects the efficiency of the motor. Summary of the Utility Model

[0003] The main object of the utility model is to provide a booster pump, aiming to reduce the weight of the rotor and improve the installation stability of the permanent magnet at the same time.

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

[0005] A pump head; and

[0006] A motor connected to the pump head, the motor includes a rotor core, the rotor core includes a rotor yoke and a plurality of rotor teeth arranged on the outer periphery of the rotor yoke, and an installation groove is formed between two adjacent rotor teeth and the rotor yoke;

[0007] Wherein, a support protrusion is arranged in the installation groove. In the radial direction of the rotor core, the support protrusion has a first end abutting against the permanent magnet located in the installation groove and a second end connected to the rotor yoke. The support protrusion is tapered towards the permanent magnet. The width of the first end is A1, the width of the second end is A2, and 0.3 ≤ A1 / A2 ≤ 0.5.

[0008] In an embodiment, the width of the permanent magnet is A3, and 5 ≤ A3 / A1 < 8.

[0009] In an embodiment, the outer peripheral walls of the rotor teeth and the rotor yoke are connected by magnetic bridges, and a groove is formed between two adjacent magnetic bridges and the rotor yoke. The support protrusion is connected to the bottom wall of the groove.

[0010] In an embodiment, the two side edges of the support protrusion have a first angle α, and the second angle between two adjacent magnetic bridges is β, and 3α / 2 ≤ β ≤ 2α.

[0011] In an embodiment, 15° ≤ α ≤ 25°.

[0012] In an 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, and 2 ≤ S1 / S2 ≤ 5.

[0013] In one embodiment, the surface of the first end facing the permanent magnet is an arc surface.

[0014] In one embodiment, there is one support convex portion corresponding to the permanent magnet, and it is located on the center line of the rotor core;

[0015] Alternatively, there are multiple support convex portions corresponding to the permanent magnet, and they are symmetrically arranged about the center line of the rotor core.

[0016] In one embodiment, in the axial direction of the rotor core, there are multiple support convex portions arranged at intervals.

[0017] In one embodiment, injection molding plastic is filled between the rotor yoke and the rotor teeth.

[0018] In the technical solution of the present utility model, a support convex portion is arranged in the installation groove of the rotor core. The first end of the support convex portion abuts against the permanent magnet, and the second end is connected to the rotor yoke, so that the permanent magnet is stably installed in the installation groove, ensuring the motor efficiency. Among them, the support convex portion is tapered as a whole towards the permanent magnet, and it is defined that the width A1 of the first end and the width A2 of the second end satisfy: 0.3 ≤ A1 / A2 ≤ 0.5. Furthermore, on the basis of ensuring the reliable assembly of the permanent magnet in the installation groove, the occupied space of the support convex portion 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. Description of the Drawings

[0019] 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 drawings in the following description 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.

[0020] Figure 1 It is a schematic structural diagram of an embodiment of a booster pump provided by the present utility model;

[0021] Figure 2 It is Figure 1 a schematic structural diagram of the rotor of the motor in;

[0022] Figure 3 It is Figure 2 a side view of the rotor in the first perspective;

[0023] Figure 4 It is Figure 2 a side view of the rotor in the second perspective.

[0024] Explanation of the reference numerals in the drawings:

[0025] 1. Boost pump; 100. Motor; 10. Rotor core; 11. Rotor yoke; 12. Rotor teeth; 13. Installation groove; 14. Support protrusion; 141. First end; 142. Second end; 15. Magnetic bridge; 16. Groove; 20. Permanent magnet; 200. Pump head.

[0026] The realization, functional features and advantages of the purpose of the present utility model will be further described in conjunction with embodiments with reference to the accompanying drawings. Specific embodiments

[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model 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. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present utility model.

[0028] 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.

[0029] 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 such feature. In addition, if "and / or" or "and / or" appears throughout the text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or a solution that satisfies both A and B at the same time. In addition, the technical solutions between various 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 scope of protection required by the present utility model.

[0030] In the related art, in order to ensure the target installation position of the permanent magnet on the rotor, by adopting the method of wrapping the rotor core around the periphery of the permanent magnet to ensure the accuracy of the installation position. However, it is easy to increase the overall weight of the rotor and also easy to increase magnetic flux leakage, affecting the motor efficiency.

[0031] To solve this technical problem, the present utility model proposes a boost pump 1.

[0032] Please refer to Figures 1 to 4 In an embodiment of the present utility model, the booster pump 1 includes a pump head 200 and a motor 100; the motor 100 is connected to the pump head 200, the motor 100 includes a rotor core 10, the rotor core 10 includes a rotor yoke 11 and a plurality of rotor teeth 12 arranged on the outer periphery of the rotor yoke 11, and an installation groove 13 is formed between two adjacent rotor teeth 12 and the rotor yoke 11; wherein, a support protrusion 14 is arranged in the installation groove 13, in the radial direction of the rotor core 10, the support protrusion 14 has a first end 141 abutting against a permanent magnet 20 located in the installation groove 13 and a second end 142 connected to the rotor yoke 11, the support protrusion 14 is tapered towards the permanent magnet 20, the width of the first end 141 is A1, the width of the second end 142 is A2, and 0.3 ≤ A1 / A2 ≤ 0.5; the weight of the rotor is reduced, and at the same time, the installation stability of the permanent magnet 20 is improved.

[0033] In the technical solution of the present utility model, a support protrusion 14 is arranged in the installation groove 13 of the rotor core 10. The first end 141 of the support protrusion 14 abuts against the permanent magnet 20, and the second end 142 is connected to the rotor yoke 11, so that the permanent magnet 20 is stably installed in the installation groove 13, ensuring the efficiency of the motor 100. Among them, the support protrusion 14 is tapered towards the permanent magnet 20 as a whole, and it is defined that the width A1 of the first end 141 and the width A2 of the second end 142 satisfy: 0.3 ≤ A1 / A2 ≤ 0.5. Furthermore, on the basis of ensuring the reliable assembly of the permanent magnet 20 in the installation groove 13, the occupied space of the support protrusion 14 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 100.

[0034] In the radial cross-section of the rotor core 10, the total area Q1 of the permanent magnets 20 and the area Q2 of the rotor core 10 satisfy: 0.45 ≤ Q1 / Q2 ≤ 0.65, so as to increase the number of permanent magnets 20 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 100, and further contributing to improving the efficiency and performance of the motor 100. Further, in cooperation with the setting of 0.3 ≤ A1 / A2 ≤ 0.5, it is beneficial to further improve the efficiency and performance of the motor 100, and at the same time realize the light weight and miniaturization of the motor 100.

[0035] Specifically, when the magnet filling rate is less than 0.45, the number of permanent magnets 20 is small, which is not conducive to improving the efficiency and performance of the motor 100. When the magnet filling rate is greater than 0.65, the number of permanent magnets 20 is large, and the material used for the rotor core 10 is less, which easily affects the overall structural strength of the rotor. Therefore, the magnet filling rate is limited between 0.45 and 0.65 to increase the magnet filling rate and improve the magnetic performance of the motor 100. Specifically, the magnet filling rate includes but is not limited to 0.45, 0.46, 0.47, 0.48, 0.49, 0.5, 0.51, 0.52, 0.53, 0.54, 0.56, 0.57, 0.58. Among them, in this embodiment, the magnet filling rate can reach 0.49, which is convenient for the motor 100 to have better magnetic performance.

[0036] Regarding the support convex portion 14, the support convex portion 14 is used as one of the positions of the permanent magnet 20 in the installation groove 13 to ensure the accurate installation of the permanent magnet 20. Through the tapered setting of the support convex portion 14, not only can the weight of the rotor core 10 be reduced, but also it helps to reduce the magnetic leakage of the magnetic flux on the rotor core 10 passing through the support convex portion 14 to the rotor yoke 11. On the basis of ensuring the assembly of the permanent magnet 20, the stress at the first end 141 of the support convex portion 14 can also be reduced. That is, when the first end 141 is directly in contact with the radial inner end of the permanent magnet 20, since the effective contact area between the support convex portion 14 and the permanent magnet 20 is small, the generated stress is also small. Of course, in other embodiments, there is a gap between the first end 141 and the radial inner end of the permanent magnet 20, and the first end 141 can be indirectly connected and supported by the injection molding material injected into the gap. At this time, the support convex portion 14 can provide support for the injection molding material to ensure the injection molding and curing of the injection molding material for the rotor yoke 11, the rotor teeth 12, and the permanent magnet 20, 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.

[0037] It is defined that A1 > A2, and 0.3 ≤ A1 / A2 ≤ 0.5. Specifically, when the ratio of A1 / A2 is too small, i.e., A1 / A2 < 0.3, the width of the first end 141 is too small, resulting in a reduced contact area between the support protrusion 14 and the permanent magnet 20. The mating strength between the permanent magnet 20 and the rotor core 10 is low, increasing the possibility of relative movement between the permanent magnet 20 and the rotor core 10, which cannot ensure the stable operation of the motor 100 and is also likely to increase noise. Or, the width of the second end 142 is too large, which is likely to increase the occupied space of the support protrusion 14. When the ratio of A1 / A2 is too large, i.e., A1 / A2 > 0.5, the width of the first end 141 is too large, and the stress at the first end 141 is likely to be large due to the increased contact area with the permanent magnet 20, which is not conducive to the structural stability of the first end 141. Or, the width of the second end 142 is too small, which is likely to affect the connection strength between the support protrusion 14 and the rotor yoke 11. Therefore, the ratio of the width A1 of the first end 141 to the width A2 of the second end 142 is limited to between 0.3 and 0.5 to ensure the stable assembly of the permanent magnet 20. At the same time, the occupied space of the support protrusion 14 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 100. The widths A1 and A2 specifically refer to the circumferential widths of the support protrusion 14 in the radial cross-section of the rotor.

[0038] Specifically, the specific ratio of the width A1 of the first end 141 to the width A2 of the second end 142 includes but is not limited to 0.3, 0.31, 0.32, 0.33, 0.34, 0.35, 0.36, 0.37, 0.38, 0.39, 0.4, 0.41, 0.42, 0.43, 0.44, 0.45, 0.46, 0.47, 0.48, 0.49, 0.5. Of course, in other embodiments, when the requirements of the user for the efficiency and performance of the motor 100 can be met, this ratio can be greater than 0.5 or less than 0.3.

[0039] It should be noted that the booster pump 1 can be configured as a diaphragm booster pump 1. Among them, the pump head 200 can be a four-chamber diaphragm pump head 200, and the motor 100 can be a plastic-encapsulated motor 100, which is convenient to achieve a high safety level by plastic-encapsulating the electrical components with the plastic-encapsulated motor 100, effectively avoiding insulation problems caused by water vapor, water leakage, etc.

[0040] Optionally, in the embodiment of the present invention, the width of the permanent magnet 20 is A3, and 5 ≤ A3 / A1 < 8. It can be understood that the width of the permanent magnet 20 is greater than the width of the first end 141 of the support protrusion 14. By defining 5 ≤ A3 / A1 < 8, on the basis of ensuring the support of the support protrusion 14 for the permanent magnet 20, the width of the first end 141 can be minimized as much as possible. Furthermore, the rotor weight is reduced, and the magnetic flux leakage from the rotor core 10 to the rotor yoke 11 through the support protrusion 14 is reduced, improving the efficiency and performance of the motor 100.

[0041] Specifically, when the ratio of A3 / A1 is too small, i.e., A3 / A1 < 5, the width of the first end 141 is too large, which easily leads to large stress at the first end 141 due to the increased contact area with the permanent magnet 20, being unfavorable for the structural stability of the first end 141 and also for the miniaturization of the support protrusion 14; when the ratio of A3 / A1 is too large, i.e., A3 / A1 > 8, the width of the first end 141 is too small, resulting in a reduced contact area between the support protrusion 14 and the permanent magnet 20, and the matching strength between the permanent magnet 20 and the rotor core 10 is low, increasing the possibility of relative movement between the permanent magnet 20 and the rotor core 10, being unfavorable for ensuring the stable operation of the motor 100; therefore, the ratio of the width A3 of the permanent magnet 20 to the width A1 of the first end 141 is limited between 5 and 8, ensuring the stable assembly of the permanent magnet 20. At the same time, the occupied space of the support protrusion 14 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 100.

[0042] Specifically, the specific ratio of the width A3 of the permanent magnet 20 to the width A1 of the first end 141 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 100 can be met, this ratio can be greater than 8 or less than 5.

[0043] Optionally, in the embodiment of the present utility model, on the radial cross-section of the rotor core 10, the radial length of the permanent magnet 20 is B, and 3 ≤ B / A3 ≤ 4. With such a setting, it is convenient to obtain the cross-sectional area of a single permanent magnet 20, and then in combination with 0.45 ≤ Q1 / Q2 ≤ 0.65, the magnet filling rate of the rotor is determined, improving the efficiency and performance of the motor 100.

[0044] Please refer to Figure 3 , in the embodiment of the present utility model, the rotor tooth 12 is connected to the outer peripheral wall of the rotor yoke 11 through a magnetic bridge 15. A groove 16 is formed between two adjacent magnetic bridges 15 and the rotor yoke 11, and the support protrusion 14 is connected to the bottom wall of the groove 16. On the one hand, it can improve the overall structural strength of the rotor core 10 and also facilitate the assembly of the rotor core 10 and the permanent magnet 20. On the other hand, due to the formation of the groove 16, compared with the two magnetic bridges 15 being connected together, it is convenient to improve the magnetic flux leakage of the rotor core 10 through the magnetic bridge 15 to the rotor yoke 11, reducing the weight of the rotor.

[0045] Among them, in the axial direction of the rotor core 10, the thickness of the magnetic bridge 15 can be smaller than the thickness of the rotor core 10, further reducing magnetic flux leakage, thereby effectively improving the efficiency and performance of the motor 100.

[0046] Furthermore, in the embodiments of the present invention, both sides of the supporting convex portion 14 have a first angle α, and the second angle between two adjacent magnetic bridges 15 is β, where 3α / 2 ≤ β ≤ 2α. Among them, the second angle between two adjacent magnetic bridges 15 is equal to the central angle corresponding to the rotor tooth 12, and the first angle is smaller than the central angle corresponding to the rotor tooth 12. In this embodiment, there are 10 installation grooves 13, 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 142 will be too large, which is not conducive to the miniaturization of the supporting convex portion 14. Therefore, the first angle α needs to be less than 36°. Of course, in other embodiments, the first angle changes with the number of magnetic poles to adapt to and support the permanent magnet 20 in the corresponding installation groove 13, and the ratio of the first angle to the second angle can also be changed, which is not limited here.

[0047] Combined with 0.3 ≤ A1 / A2 ≤ 0.5, in the embodiments of the present invention, 15° ≤ α ≤ 25°, which is convenient to meet the tapered design of the supporting convex portion 14. Specifically, the first angle can be less than or equal to 25°, and the first angle α ≥ 15°, which helps to prevent the width of the first end 141 from being too small, affecting the structural stability of the supporting convex portion 14 at the first end 141 and extending the service life of the supporting convex portion 14.

[0048] 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°.

[0049] Optionally, in the embodiments of the present invention, in the radial cross-section of the rotor core 10, the area of the groove 16 is S1, and the area of the supporting convex portion 14 is S2, where 2 ≤ S1 / S2 ≤ 5. It can be understood that due to the setting of the second angle, the cross-sectional shape of the groove 16 can be approximately an isosceles trapezoid, and due to the setting of the first angle, the cross-sectional shape of the supporting convex portion 14 can be approximately an isosceles trapezoid or even approximately an isosceles triangle. Therefore, limiting the cross-sectional area ratio of the groove 16 to the supporting convex portion 14 between 2 and 5, and cooperating with the above-mentioned related inequality limitations, on the basis of ensuring the stable assembly of the permanent magnet 20 and the stable operation of the motor 100, it can reliably ensure that the supporting convex portion 14 occupies a small space, achieving the light weight of the rotor. At the same time, it reduces magnetic flux leakage and improves the efficiency and performance of the motor 100.

[0050] Optionally, in an embodiment of the utility model, the surface of the first end 141 facing the permanent magnet 20 is a curved surface, which can support the contact area between the protrusion 14 and the permanent magnet 20 as much as possible compared to a flat surface, thereby helping to reduce the stress at the first end 141 and, at the same time, ensuring the stable installation of the permanent magnet 20 in the mounting groove 13.

[0051] Optionally, in an embodiment of the present utility model, one supporting protrusion 14 is provided corresponding to the permanent magnet 20 and is located on the center line of the rotor core 10 , so as to improve the force uniformity of the permanent magnet 20 and ensure the stable installation of the permanent magnet 20 .

[0052] In another embodiment, while meeting the requirement of lightweighting the rotor, a plurality of support protrusions 14 are provided corresponding to the permanent magnets 20 and are symmetrically arranged about the center line of the rotor core 10 to ensure uniform force on the permanent magnets 20 and improve the connection strength between the permanent magnets 20 and the rotor core 10.

[0053] Optionally, in an embodiment of the utility model, in the axial direction of the rotor core 10, a plurality of support protrusions 14 are arranged at intervals. This can not only reduce the overall weight of the rotor, but also help to isolate the magnetic flux on two adjacent support protrusions 14, reduce magnetic flux leakage, and improve the efficiency and performance of the motor 100.

[0054] Optionally, in an embodiment of the utility model, plastic injection glue is filled between the rotor yoke 11 and the rotor teeth 12. At this time, an injection space for plastic injection glue to flow in is formed between the groove wall of the groove 16 and the outer peripheral surface of the supporting protrusion 14, which facilitates the inflow of plastic injection glue and facilitates improving the connection strength between the rotor core 10 and the permanent magnet 20. At the same time, compared with the use of additional fasteners to fix the rotor as a whole, the setting of plastic injection glue is conducive to reducing the volume of the rotor, thereby realizing the miniaturization and lightweight of the motor 100.

[0055] 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 100 under different working conditions. Furthermore, the injection molding glue is arranged on the outer periphery of the rotor, which helps to improve the connection strength between the rotor core 10 and the permanent magnet 20.

[0056] Optionally, in an embodiment of the present utility model, in the axial direction of the rotor core 10, the thickness h1 of the support convex portion 14 and the thickness h2 of the permanent magnet 20 satisfy: h1 ≤ h2. It can be understood that on the basis of ensuring the stable installation of the permanent magnet 20 in the installation groove 13, the thickness of the permanent magnet 20 is greater than the thickness of the support convex portion 14. In this way, it is beneficial to increase the magnetic flux between the rotor and the stator coil, improve the efficiency and performance of the motor 100, and at the same time, optimize the magnetic field distribution, facilitate reducing magnetic field distortion, and improve the operation stability and reliability of the motor 100.

[0057] Among them, the thickness h1 of the support convex portion 14 can be less than or equal to the thickness of the rotor core 10.

[0058] Specifically, in an embodiment of the present utility model, 0.8 ≤ h1 / h2 ≤ 1. Specifically, as Figure 4 shown, when h1 / h2 is greater than 1, in the case of the same magnet filling rate, it is easy to increase the volume of the rotor, which is not conducive to the miniaturization of the rotor. When h1 / h2 is less than 0.8, the magnetic flux between the rotor and the stator coil decreases, and the magnetic field distortion increases, which easily affects the torque and efficiency of the motor 100 and also affects the stable operation of the motor 100. Therefore, the thickness ratio of the thickness h1 of the support convex portion 14 and the thickness h2 of the permanent magnet 20 is limited between 0.8 and 1 to improve the efficiency and performance of the motor 100, and at the same time, improve the operation stability and reliability of the motor 100. In this embodiment, the thickness h1 of the support convex portion 14 can be less than or equal to the thickness of the rotor core 10. However, in other embodiments, the thickness of the support convex portion 14 is less than the thickness of the rotor core 10, and the recessed thicknesses of the support convex portion 14 at both ends of the rotor core 10 are the same.

[0059] Furthermore, the protruding thicknesses of the permanent magnet 20 at both ends of the rotor core 10 are the same, that is, in the axial direction of the rotor, the distance from the end face of one end of the permanent magnet 20 to the end face of the rotor core 10 on the same side is the same as the distance from the end face of the other end of the permanent magnet 20 to the end face of the rotor core 10 on the same side, which helps to improve the rotational stability of the rotor. In addition, when the rotor core 10 and the permanent magnet 20 are injection-molded into one body by injection plastic, the protruding permanent magnet 20 is also convenient for increasing the structural strength of the rotor.

[0060] The above description 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 directly / indirectly applied 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 connected to the pump head, wherein the motor comprises a rotor core, wherein the rotor core comprises a rotor yoke and a plurality of rotor teeth arranged on the outer periphery of the rotor yoke, and a mounting groove is formed between two adjacent rotor teeth and the rotor yoke; A supporting protrusion is provided in the mounting groove. In the radial direction of the rotor core, the supporting protrusion has a first end that presses against the permanent magnet in the mounting groove and a second end connected to the rotor yoke. The supporting protrusion is gradually tapered toward the permanent magnet. The width of the first end is A1, and the width of the second end is A2, and 0.3≤A1 / A2≤0.

5.

2. The booster pump according to claim 1, characterized in that: The width of the permanent magnet is A3, and 5≤A3 / A1<8.

3. The booster pump according to claim 1, characterized in that: The rotor teeth are connected to the outer peripheral wall of the rotor yoke via a magnetic bridge, a groove is formed between two adjacent magnetic bridges and the rotor yoke, and the supporting protrusion is connected to the bottom wall of the groove.

4. The booster pump according to claim 3, 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.

5. The booster pump according to claim 4, characterized in that: 15°≤α≤25°。 6. The booster pump according to claim 3, 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.

7. The booster pump according to claim 1, characterized in that: The surface of the first end facing the permanent magnet is a curved surface.

8. 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.

9. The booster pump according to claim 8, characterized in that: A plurality of the supporting protrusions are arranged at intervals in the axial direction of the rotor core.

10. 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.

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