Motor and booster pump

Abstract

The motor comprises a rotor assembly, a first eccentric wheel and a second eccentric wheel, the rotor assembly comprises a rotating shaft, the first eccentric wheel is arranged at one end of the rotating shaft, the first eccentric wheel is suitable for acting on a first pump head to enable the first pump head to pump and drain fluid, and the second eccentric wheel is arranged at the other end of the rotating shaft. The second eccentric wheel is suitable for acting on the second pump head to enable the second pump head to pump and drain fluid, the connecting line of the maximum distance from the rotating center of the first eccentric wheel to the circumferential face in the radial direction is a first connecting line, and the connecting line of the maximum distance from the rotating center of the second eccentric wheel to the circumferential face in the radial direction is a second connecting line. A deflection angle alpha is formed between the first connecting line and the second connecting line and is larger than 0 degree. The first eccentric wheel and the second eccentric wheel are designed to be mutually deflected, so that the stress of the first eccentric wheel and the stress of the second eccentric wheel are staggered in space, the stress of the first eccentric wheel and the stress of the second eccentric wheel can be mutually counteracted, and then vibration and noise of motor operation are reduced.

Description

Technical Field

[0001] This application relates to the technical field of booster pumps, and particularly to a motor. Background Art

[0002] A double-headed booster pump includes a motor, a first pump head and a second pump head. The first pump head is installed at one end of the motor, and the second pump head is installed at the other end of the motor. One end of the rotating shaft of the motor drives the corresponding part of the first pump head to move through a first eccentric wheel, so that the first pump head pumps and discharges fluid. The other end of the rotating shaft of the motor drives the corresponding part of the second pump head to move through a second eccentric wheel, so that the second pump head pumps and discharges fluid. Currently, there are certain vibrations and noises in such double-headed booster pumps, which need to be solved. Utility Model Content

[0003] This application aims to solve at least one of the technical problems in the related art to some extent. For this purpose, this application provides a motor.

[0004] To achieve the above object, this application discloses a motor, which includes:

[0005] A stator assembly;

[0006] A rotor assembly, rotatably arranged relative to the stator assembly, and the rotor assembly includes a rotating shaft;

[0007] A first eccentric wheel, arranged at one end of the rotating shaft, and the first eccentric wheel is adapted to act on the first pump head to enable the first pump head to pump and discharge fluid; and

[0008] A second eccentric wheel, arranged at the other end of the rotating shaft, and the second eccentric wheel is adapted to act on the second pump head to enable the second pump head to pump and discharge fluid;

[0009] The connection line between the maximum distance from the rotation center of the first eccentric wheel to its circumferential surface in the radial direction is the first connection line, and the connection line between the maximum distance from the rotation center of the second eccentric wheel to its circumferential surface in the radial direction is the second connection line. There is a deflection angle α between the first connection line and the second connection line, satisfying α > 0°, so that the first eccentric wheel and the second eccentric wheel are arranged to deflect relative to each other.

[0010] In some embodiments of this application, the water inlet and outlet cavities of the first pump head and the second pump head are N respectively, satisfying N ≥ 3.

[0011] In some embodiments of this application, the first eccentric wheel and the second eccentric wheel are the same component.

[0012] In some embodiments of this application, the rotor assembly is rotatably arranged inside the stator assembly, and the rotor assembly further includes:

[0013] A support body, the support body comprising a core and a tooth portion, a plurality of the tooth portions are arranged around the core portion, a mounting groove is provided between adjacent tooth portions, and the rotating shaft is passed through and fixed to the core portion; and

[0014] Permanent magnet, multiple permanent magnets are arranged in a one-to-one correspondence in multiple installation grooves, the permanent magnet includes a first part and a second part, the second part is arranged on a side of the first part away from the core, and the first part is gradually reduced from the second part toward the core.

[0015] In some embodiments of the present application, two sides of the second portion along the circumference of the rotor assembly are parallel.

[0016] In some embodiments of the present application, along the circumference of the rotor assembly, the midpoint between the two sides of the first part is a first midpoint, and the midpoint between the two sides of the second part is a second midpoint, defining a first virtual plane, which passes through the first midpoint, the second midpoint and the rotation axis of the rotor assembly, and the first virtual plane constitutes a symmetry plane of the permanent magnet.

[0017] In some embodiments of the present application, a cross-section of the first part perpendicular to the rotation axis of the rotor assembly is a first cross-section, the first cross-section is a trapezoid, a cross-section of the second part perpendicular to the rotation axis of the rotor assembly is a second cross-section, the second cross-section is a rectangle, and the corner of the second cross-section on the side away from the first part is rounded.

[0018] In some embodiments of the present application, the maximum length of the permanent magnet along the radial direction of the rotor assembly is H1, and the maximum length of the first part along the radial direction of the rotor assembly is H2, satisfying

[0019]

[0020] The minimum distance between the two sides of the first part along the circumference of the rotor assembly is L2, and the maximum distance between the two sides of the second part along the circumference of the rotor assembly is L1, satisfying in, P is the number of pole pairs of the rotor assembly, and R is the radius of the rotor assembly.

[0021] In some embodiments of the present application, along the circumference of the rotor assembly, one side of the permanent magnet is an N pole and the other side is an S pole, and the polarities of the opposite sides of adjacent permanent magnets are the same.

[0022] The second aspect of the present application discloses a booster pump, which includes a first pump head, a second pump head, and the above-mentioned motor. The motor is adapted to act on the first pump head through the first eccentric wheel to cause the first pump head to pump and discharge fluid, and the motor is adapted to act on the second pump head through the second eccentric wheel to cause the second pump head to pump and discharge fluid.

[0023] In the technical solution of the present application, the first eccentric wheel and the second eccentric wheel are designed to be deflected relative to each other. In this way, the forces on the first eccentric wheel and the second eccentric wheel are staggered in space, which can, to a certain extent, cancel out the forces on the first eccentric wheel and the second eccentric wheel, and then reduce the vibration and noise during the operation of the motor to a certain extent.

[0024] Other advantages of the present application will be partially given in the following description, partially will become obvious from the following description, or will be understood through the practice of the present application. Description of the Drawings

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application 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 application. For those of ordinary skill in the art, without creative efforts, other designs can also be obtained based on the structures shown in these drawings.

[0026] Figure 1 Schematic diagram of the booster pump in some embodiments;

[0027] Figure 2 Cross-sectional view of the booster pump in some embodiments;

[0028] Figure 3 Schematic diagram of the mutual deflection of the first eccentric wheel and the second eccentric wheel in some embodiments (observing the first eccentric wheel and the second eccentric wheel along the axial direction);

[0029] Figure 4 Assembly schematic diagram of the rotating shaft, the first eccentric structure, and the second eccentric structure in some embodiments;

[0030] Figure 5 For Figure 4 Schematic diagram of the structure shown in the axial direction along the rotating shaft;

[0031] Figure 6 Schematic diagram of the magnetic circuit topology of the rotor assembly in some embodiments;

[0032] Figure 7 Schematic diagram of the support body in some embodiments;

[0033] Figure 8 Schematic diagram of the permanent magnet in some embodiments;

[0034] Figure 9 It is the air-gap magnetic flux density diagram of the motor in some embodiments.

[0035] Explanation of the reference numerals in the drawings:

[0036] Booster pump 100, first pump head 1100, second pump head 1200, water inlet and outlet cavity 1300, motor 2000, rotor assembly 2100, support body 2110, core part 2111, tooth part 2112, mounting groove 2113, permanent magnet 2120, first part 2121, second part 2122, rotating shaft 2130, first flat position 2131, second flat position 2132, first virtual plane 2140, stator assembly 2200, first eccentric wheel 2310, first connection line 2311, second eccentric wheel 2320, second connection line 2321, first step part 2330, first notch 2331, second step part 2340, second notch 2341, housing 2400, first end cover 2510, second end cover 2520.

[0037] The realization of the purpose, functional features and advantages of this application will be further described in conjunction with the embodiments and with reference to the accompanying drawings. Detailed implementation manners

[0038] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0039] It should be noted that all the directional indications (such as up, down, left, right, front, back...) in the embodiments of the present application are only used to explain the relative position relationship and movement conditions between components in a specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0040] In the present application, unless otherwise clearly defined and limited, the terms "connection", "fixation", etc. shall be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal connection of two components or the interaction relationship between two components, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific situations.

[0041] In addition, in the present application, descriptions such as "first" and "second" are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions between various embodiments may 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 application.

[0042] The first aspect of the present application discloses a motor 2000, as shown in combination with Figures 1 to 3 As shown, the motor 2000 includes a stator assembly 2200, a rotor assembly 2100, a first eccentric wheel 2310 and a second eccentric wheel 2320. The rotor assembly 2100 is rotatably arranged relative to the stator assembly 2200. The rotor assembly 2100 includes a rotating shaft 2130. The first eccentric wheel 2310 is arranged at one end of the rotating shaft 2130, and the second eccentric wheel 2320 is arranged at the other end of the rotating shaft 2130. The first eccentric wheel 2310 is used to act on the first pump head 1100 so that the first pump head 1100 pumps and discharges fluid. The second eccentric wheel 2320 is used to act on the second pump head 1200 so that the second pump head 1200 pumps and discharges fluid. Along the radial direction (the extension direction of the rotation axis of the rotating shaft 2130 is the axial direction, and the radial direction is perpendicular to the axial direction, the same below), the line connecting the maximum distance from the rotation center of the first eccentric wheel 2310 to its circumferential surface is defined as the first connection line 2311. Along the radial direction, the line connecting the maximum distance from the rotation center of the second eccentric wheel 2320 to its circumferential surface is defined as the second connection line 2321. There is a deflection angle α between the first connection line 2311 and the second connection line 2321, and it is required to satisfy α>0°. In this way, the first eccentric wheel 2310 and the second eccentric wheel 2320 are arranged to deflect relative to each other. In this embodiment, by designing the first eccentric wheel 2310 and the second eccentric wheel 2320 to deflect relative to each other, the forces on the first eccentric wheel 2310 and the second eccentric wheel 2320 are spatially offset, which can, to a certain extent, cancel out the forces on the first eccentric wheel 2310 and the second eccentric wheel 2320, and then reduce the vibration and noise during the operation of the motor 2000 to a certain extent.

[0043] Specifically, the motor 2000 includes a rotor assembly 2100 and a stator assembly 2200. The rotor assembly 2100 is the rotatable part, and the stator assembly 2200 is the non-rotatable part, such as Figure 1 and Figure 2As shown in the motor 2000, the rotor assembly 2100 is installed inside the stator assembly 2200, and the rotating shaft 2130 extends to both axial sides of the stator assembly 2200. The rotor assembly 2100 is designed to be rotatably arranged relative to the stator assembly 2200. When the stator assembly 2200 is energized, a changing magnetic field is generated, and the changing magnetic field interacts with the rotor assembly 2100 to cause the rotor assembly 2100 to rotate.

[0044] Taking the application of the motor 2000 to the booster pump 100 as an example, or rather, the booster pump 100 includes a motor 2000, a first pump head 1100, and a second pump head 1200. The motor 2000 further includes a housing 2400, a first end cover 2510, and a second end cover 2520. The stator assembly 2200 is disposed in the housing 2400, that is, the stator assembly 2200 is fixedly connected to the housing 2400. The first end cover 2510 is connected to one end of the housing 2400 to cover the rotor assembly 2100, and the second end cover 2520 is connected to the other end of the housing 2400 to cover the rotor assembly 2100. The rotating shaft 2130 of the rotor assembly 2100 needs to pass through the first end cover 2510 and the second end cover 2520. Generally, the first end cover 2510, the second end cover 2520, and the housing 2400 are fixed by means of screw connection. First, the stator assembly 2200 is combined with the housing 2400, then the rotor assembly 2100 is installed inside the stator assembly 2200, and then the first end cover 2510 and the second end cover 2520 are connected to the housing 2400, so as to realize the wrapping protection of the stator assembly 2200 and the rotor assembly 2100.

[0045] There are various ways to connect and fix the housing 2400 and the stator assembly 2200. For example, a positioning structure is provided on the housing 2400, and the stator assembly 2200 is installed on the housing 2400 corresponding to the positioning structure, and then screws or other means are used to realize the connection and fixation between the housing 2400 and the stator assembly 2200. However, this method is slightly troublesome. In this embodiment, the housing 2400 and the stator assembly 2200 are injection-molded, that is, the housing 2400 is combined with the stator assembly 2200 during the molding process, which simplifies the connection and fixation structure between the housing 2400 and the stator assembly 2200, reduces the connection difficulty between the housing 2400 and the stator assembly 2200, and can also effectively reduce costs. For example, the stator assembly 2200 is placed in a mold, and plastic (such as BMC, bulk molding compound) is injected into the mold. The plastic is molded into the housing 2400, and the plastic is tightly combined with the stator assembly 2200 during the molding process.

[0046] The first eccentric wheel 2310 is installed at one end of the rotating shaft 2130, and the second eccentric wheel 2320 is installed at the other end of the rotating shaft 2130. Here, the installation means that the first eccentric wheel 2310 is relatively fixed to the rotating shaft 2130, and the second eccentric wheel 2320 is relatively fixed to the rotating shaft 2130. The rotation of the rotating shaft 2130 can drive the first eccentric wheel 2310 and the second eccentric wheel 2320 to rotate. The first eccentric wheel 2310 is connected (directly or indirectly) to the corresponding part of the first pump head 1100. The rotation of the first eccentric wheel 2310 drives the corresponding part of the first pump head 1100 to move, so that the first pump head 1100 can pump and discharge the fluid. The second eccentric wheel 2320 is connected (directly or indirectly) to the corresponding part of the second pump head 1200. The rotation of the second eccentric wheel 2320 drives the corresponding part of the second pump head 1200 to move, so that the second pump head 1200 can pump and discharge the fluid.

[0047] For example, the booster pump 100 is a diaphragm pump. The first pump head 1100 is installed on the first end cover 2510, and the second pump head 1200 is installed on the second end cover 2520. The first eccentric wheel 2310 is connected (directly or indirectly) to the diaphragm of the first pump head 1100, and the second eccentric wheel 2320 is connected (directly or indirectly) to the diaphragm of the second pump head 1200. The motor 2000 drives the first eccentric wheel 2310 and the second eccentric wheel 2320 to rotate, and the diaphragms of the first pump head 1100 and the second pump head 1200 move accordingly, so that the liquid can be pumped and discharged.

[0048] In this embodiment, the connection line of the maximum distance from the rotation center O1 of the first eccentric wheel 2310 to its (here, "its" refers to the first eccentric wheel 2310) circumferential surface along the radial direction is defined as the first connection line 2311, and the connection line of the maximum distance from the rotation center O2 of the second eccentric wheel 2320 to its (here, "its" refers to the second eccentric wheel 2320) circumferential surface along the radial direction is defined as the second connection line 2321. The first connection line 2311 and the second connection line 2321 intersect in space. For example, when observing the first eccentric wheel 2310 and the second eccentric wheel 2320 along the axial direction of the rotating shaft 2130 (as Figure 3 shown), there is a deflection angle α between the first connection line 2311 and the second connection line 2321, and α > 0°. In this way, the mutual deflection of the first eccentric wheel 2310 and the second eccentric wheel 2320 in space is realized. The force received by the first eccentric wheel 2310 is offset by a certain angle in space from the second eccentric wheel 2320. In this way, to a certain extent, the forces on the first eccentric wheel 2310 and the second eccentric wheel 2320 can be offset from each other, and then the vibration and noise during the operation of the motor 2000 can be reduced to a certain extent.

[0049] Combined with Figure 2As shown, the first pump head 1100, the second pump head 1200 and the motor 2000 are assembled to form a diaphragm pump. The first pump head 1100 and the second pump head 1200 both have an inlet and outlet water cavity 1300. The number of the inlet and outlet water cavities 1300 of the first pump head 1100 is N, and the number of the inlet and outlet water cavities 1300 of the second pump head 1200 is also N, and N ≥ 3, for example, N is 3, 4, 5 or 6. When the number of the inlet and outlet water cavities 1300 of the first pump head 1100 and the second pump head 1200 is N, it satisfies After a lot of experiments by the inventors, it was found that this condition is more conducive to the vibration and noise reduction of a diaphragm pump (boosting pump) having multiple (at least three or more) water inlet and outlet chambers 1300.

[0050] In some embodiments, the first eccentric wheel 2310 and the second eccentric wheel 2320 are identical components, and the identical components here refer to the identical shapes, sizes, and structures. Identical components are more conducive to the realization of shock absorption and noise reduction. Under the premise that the first eccentric wheel 2310 and the second eccentric wheel 2320 are identical components, the deflection angle α can be understood as, when the first eccentric wheel 2310 and the second eccentric wheel 2320 are opposite to each other in space (the first connecting line 2311 and the second connecting line 2321 coincide), one of the first eccentric wheel 2310 and the second eccentric wheel 2320 is rotated relative to the other by a certain angle, and this certain angle is the deflection angle α. For example Figure 4 and Figure 5 As shown, the first eccentric wheel 2310 is provided with a first step portion 2330 raised relative to the circumference of the first eccentric wheel 2310, the first eccentric wheel 2310 and the first step portion 2330 constitute a first eccentric structure, the circumference of the first step portion 2330 is provided with a first notch 2331, the second eccentric wheel 2320 is provided with a second step portion 2340 raised relative to the circumference of the second eccentric wheel 2320, the second eccentric wheel 2320 and the second step portion 2340 constitute a second eccentric structure, the circumference of the second step portion 2340 is provided with a second notch 2341, and one end of the rotating shaft 2130 is provided with a first flat position 2 131 and the other end is provided with a second flat position 2132, the first eccentric wheel 2310 is sleeved in the first flat position 2131, the first notch 2331 and the first flat position 2131 are opposite, the second eccentric wheel 2320 is sleeved in the second flat position 2132, the second notch 2341 and the second flat position 2132 are opposite, when the first eccentric wheel 2310 and the second eccentric wheel 2320 are opposite to each other in space (the first connecting line 2311 and the second connecting line 2321 coincide with each other), the first notch 2331 and the second notch 2341 overlap, when the rotation deflection angle α is reached, the first notch 2331 and the second notch 2341 are staggered.

[0051] Combination Figures 6 to 8As shown, in some embodiments, the rotor assembly 2100 includes a support 2110 and permanent magnets 2120. The permanent magnets 2120 are mounted on the support 2110. The support 2110 includes a core portion 2111 and tooth portions 2112. The number of tooth portions 2112 is multiple. Here, "multiple" means two or more, and the same applies hereinafter. The multiple tooth portions 2112 are arranged around the core portion 2111, and mounting grooves 2113 are formed between adjacent tooth portions 2112. The number of permanent magnets 2120 corresponds to the number of mounting grooves 2113 one by one. The permanent magnets 2120 are mounted into the mounting grooves 2113. The permanent magnets 2120 include a first portion 2121 and a second portion 2122. The second portion 2122 is disposed on the side of the first portion 2121 facing away from the core portion 2111, and the first portion 2121 is tapered from the second portion 2122 toward the core portion 2111. In this embodiment, by mounting the permanent magnets 2120 into the mounting grooves 2113, it is equivalent to embedding the permanent magnets 2120 into the support 2110, and by designing the first portion 2121 to be tapered, the air-gap magnetic density can be effectively increased, thereby improving the efficiency of the motor 2000 and reducing the volume of the motor 2000.

[0052] Specifically, the rotor assembly 2100 includes a support 2110, permanent magnets 2120, and a rotating shaft 2130. The support 2110 is the framework of the rotor assembly 2100 and can support the permanent magnets 2120. There are various types of supports 2110. For example, the support 2110 is formed by laminating silicon steel sheets. The support 2110 includes a core portion 2111 and tooth portions 2112. Generally, the core portion 2111 and the tooth portions 2112 are integrally formed structures. The core portion 2111 is generally cylindrical. The rotating shaft 2130 passes through the core portion 2111 and is fixedly connected. The tooth portions 2112 are provided on the core portion 2111. The multiple tooth portions 2112 are arranged around the core portion 2111. The shapes of the tooth portions 2112 are various. For example, they are fan-shaped. Mounting grooves 2113 are provided between adjacent tooth portions 2112 (referring to two adjacent tooth portions 2112). The permanent magnets 2120 are inserted into the mounting grooves 2113 and fixed in the mounting grooves 2113, thereby being assembled with the support 2110. The material of the permanent magnets 2120 can be rare-earth permanent magnet materials, ferrite permanent magnet materials, alnico alloys, iron-chromium-cobalt alloys, etc.

[0053] The installation of the permanent magnet 2120 into the installation groove 2113 is equivalent to an embedded setting, which is beneficial to the compact design of the rotor assembly 2100. The combination of the permanent magnet 2120 and the support body 2110 also has a high structural strength, reducing the risk of the permanent magnet 2120 falling off, especially suitable for applications with high-speed operation. On this basis, the structure of the permanent magnet 2120 is further optimized in this embodiment. The permanent magnet 2120 includes a first part 2121 and a second part 2122. The first part 2121 and the second part 2122 are arranged in sequence along the direction away from the center of the rotor assembly 2100, that is, the first part 2121 is arranged on the side of the second part 2122 facing the center (core 2111) of the rotor assembly 2100, and the second part 2122 is arranged on the side of the first part 2121 facing away from the center (core 2111) of the rotor assembly 2100. And the first part 2121 is designed to gradually shrink from the second part 2122 towards the center (core 2111) of the rotor assembly 2100. By the tapered setting of the first part 2121, the magnetic flux density at the center of the rotor assembly 2100 can be reduced, avoiding magnetic saturation, enabling the magnetic flux to pass through the rotor assembly 2100 and the stator assembly 2200 more effectively, thereby increasing the air-gap magnetic density. The increase in the air-gap magnetic density is beneficial to improving the efficiency of the motor 2000 and reducing the volume of the motor 2000.

[0054] Further, in combination with Figure 6 and Figure 8 As shown, in some embodiments, the two sides of the second part 2122 along the circumferential direction of the rotor assembly 2100 are arranged parallel to each other. It can be understood that the second part 2122 is closer to the stator assembly 2200 than the first part 2121. By designing the two sides of the second part 2122 along the circumferential direction of the rotor assembly 2100 to be parallel to each other, it is beneficial to strengthen the magnetic flux density at the position where the second part 2122 is located, thereby further increasing the air-gap magnetic density, and then being beneficial to improving the efficiency of the motor 2000.

[0055] In combination with Figure 6As shown, in some embodiments, the midpoint between the two circumferential sides of the first part 2121 along the rotor assembly 2100 is defined as the first midpoint, and the midpoint between the two circumferential sides of the second part 2122 along the rotor assembly 2100 is defined as the second midpoint. A first virtual plane 2140 is defined. The first virtual plane 2140 passes through the rotation axis of the rotor assembly 2100, the first midpoint, and the second midpoint, and the first virtual plane 2140 constitutes the symmetry plane of the permanent magnet 2120, that is, the permanent magnet 2120 is a symmetric structure with respect to the first virtual plane 2140. The first virtual plane 2140 is a plane defined artificially. When the first virtual plane 2140 passes through the rotation axis of the rotor assembly 2100, the first virtual plane 2140 is the radial plane of the rotor assembly 2100, and the first virtual plane 2140 can pass through the first midpoint and the second midpoint at the same time. The first virtual plane 2140 divides the permanent magnet 2120 into two symmetric halves. By setting it in this way, a more uniform magnetic field is generated on both circumferential sides of the permanent magnet 2120 along the rotor assembly 2100, thereby reducing torque ripple, which is beneficial to improving the efficiency of the motor 2000. It is precisely the reduction of torque ripple that also reduces the noise and vibration during the operation of the motor 2000.

[0056] For example Figure 8 For the rotor assembly 2100 shown, the cross-section of the first part 2121 is defined as the first cross-section. The first cross-section is perpendicular to the rotation axis of the rotor assembly 2100, and the first cross-section is trapezoidal. The lower base of the trapezoid is connected to the second part 2122, so that the first part 2121 is tapered from the second part 2122 towards the core 2111. When the permanent magnet 2120 is a symmetric structure with respect to the first virtual plane 2140, the first cross-section constitutes an isosceles trapezoid. By designing the first cross-section as trapezoidal, it is convenient to form the tapered setting of the first part 2121, thereby realizing the improvement of air-gap airtightness. The trapezoidal first cross-section is also convenient for processing the permanent magnet 2120. The cross-section of the second part 2122 is defined as the second cross-section. The second cross-section is perpendicular to the rotation axis of the rotor assembly 2100. By designing the second cross-section as rectangular, the two circumferential sides of the second part 2122 are set parallel to each other along the rotor assembly 2100, thereby realizing the improvement of air-gap magnetic density and being convenient for processing the permanent magnet 2120.

[0057] Furthermore, the corners on the side of the second cross-section facing away from the first part 2121 are rounded, that is, the corners on the side of the second part 2122 facing away from the first part 2121 are rounded. And the side of the second part 2122 facing away from the first part 2121 is closer to the stator assembly 2200 relative to the first part 2121. Also, since the improvement of the rotor assembly 2100 can enhance the air-gap magnetic density, designing the corners on the side of the second part 2122 facing away from the first part 2121 as rounded can reduce the local concentration of magnetic flux at the corners, improve the continuity of the magnetic circuit, and be more conducive to improving the efficiency of the motor 2000. In addition, at the outer edge of the permanent magnet 2120 (the position far from the center of the rotor assembly 2100), if there are sharp corners, stress concentration will occur, which will cause material fatigue. The rounded corners can reduce stress concentration and improve the mechanical strength and durability of the permanent magnet 2120.

[0058] Combined with Figure 6 and Figure 8 shown, in some embodiments, the maximum length of the permanent magnet 2120 along the radial direction of the rotor assembly 2100 is H1, the maximum length of the first part 2121 along the radial direction of the rotor assembly 2100 is H2, the minimum distance between the two sides of the first part 2121 along the circumferential direction of the rotor assembly 2100 is L2, and the maximum distance between the two sides of the second part 2122 along the circumferential direction of the rotor assembly 2100 is L1, satisfying wherein, R is the radius of the rotor assembly 2100, and P is the number of pole pairs of the rotor assembly 2100. For example the value of is 0.5, 0.6 or 0.7, the value of is 0.25, 0.35, 0.45 or 0.55, the value of is 0.3, 0.4 or 0.5, Figure 6 the number of pole pairs of the rotor assembly 2100 in is 10. After a large number of tests by the inventor, by optimizing L1, L2, L3, H1 and H2, the air-gap magnetic density can be further improved, thereby further optimizing the efficiency of the motor 2000, and at the same time making the structure of the rotor assembly 2100 more compact and more conducive to miniaturized design. As can be seen from Figure 9 the air-gap magnetic density diagram of the motor 2000 shown, by improving the rotor assembly 2100, the air-gap magnetic density can be effectively increased (in this embodiment, L1 of the rotor assembly 2100 is 7.5 mm, L2 is 4.75 mm, L3 is 16.06 mm, H1 is 16.24 mm, H2 is 6.33 mm, R is 26 mm, θ is 36°, and the number of pole pairs is 10).

[0059] Combined with Figure 6As shown, in some embodiments, along the circumferential direction of the rotor assembly 2100, one side of the permanent magnet 2120 is an N pole and the other side is an S pole, and the polarities of the facing sides of adjacent permanent magnets 2120 are the same. Here, the polarities of the facing sides of adjacent permanent magnets 2120 being the same means that the polarity of one side of one of the adjacent permanent magnets 2120 facing the other is the same as the polarity of the side of the other facing the one. For example, three permanent magnets 2120 are arranged around the core 2111 in sequence as the first permanent magnet, the second permanent magnet, and the third permanent magnet. The side of the first permanent magnet facing the second permanent magnet is an S pole, the side of the second permanent magnet facing the first permanent magnet is an S pole, the side of the second permanent magnet facing the third permanent magnet is an N pole, and the side of the third permanent magnet facing the second permanent magnet is an N pole, and so on. It can also be that the side of the first permanent magnet facing the second permanent magnet is an N pole, the side of the second permanent magnet facing the first permanent magnet is an N pole, the side of the second permanent magnet facing the third permanent magnet is an S pole, and the side of the third permanent magnet facing the second permanent magnet is an S pole. By setting the polarities of the facing sides of adjacent permanent magnets to be the same, it is not only beneficial to improving the air-gap magnetic density, but also can reduce the hysteresis loss, further improve the efficiency of the motor, and also helps to improve the overload capacity of the motor.

[0060] The second aspect of the present application discloses a booster pump 100, in combination with Figures 1 to 3As shown in the figure, the booster pump 100 includes a first pump head 1100, a second pump head 1200 and the above-mentioned motor 2000. The motor 2000 includes a stator assembly 2200, a rotor assembly 2100, a first eccentric wheel 2310 and a second eccentric wheel 2320. The rotor assembly 2100 is rotatably arranged relative to the stator assembly 2200. The rotor assembly 2100 includes a rotating shaft 2130. The first eccentric wheel 2310 is arranged at one end of the rotating shaft 2130, and the second eccentric wheel 2320 is arranged at the other end of the rotating shaft 2130. The first eccentric wheel 2310 is used to act on the first pump head 1100 so that the first pump head 1100 pumps and discharges fluid, and the second eccentric wheel 2320 is used to act on the second pump head 1200 so that the second pump head 1200 pumps and discharges fluid. The connection line of the maximum distance from the rotation center of the first eccentric wheel 2310 to its circumferential surface along the radial direction is defined as the first connection line 2311, and the connection line of the maximum distance from the rotation center of the second eccentric wheel 2320 to its circumferential surface along the radial direction is defined as the second connection line 2321. There is a deflection angle α between the first connection line 2311 and the second connection line 2321, and it is necessary to satisfy α>0°. In this way, the first eccentric wheel 2310 and the second eccentric wheel 2320 are arranged to be deflected relative to each other. By designing the first eccentric wheel 2310 and the second eccentric wheel 2320 to be deflected relative to each other, the forces on the first eccentric wheel 2310 and the second eccentric wheel 2320 are spatially staggered, which can, to a certain extent, cancel out the forces on the first eccentric wheel 2310 and the second eccentric wheel 2320, and then reduce the vibration and noise during the operation of the motor 2000 to a certain extent. The motor 2000 of the booster pump 100 in this embodiment adopts the technical solution of the above-mentioned embodiment, so it has at least the beneficial effects brought by the technical solution of the above-mentioned embodiment, which will not be repeated here.

[0061] For example, the booster pump 100 is a diaphragm pump. The first pump head 1100 is installed on the first end cover 2510, and the second pump head 1200 is installed on the second end cover 2520. The first eccentric wheel 2310 is connected to the diaphragm of the first pump head 1100 (directly or indirectly), and the second eccentric wheel 2320 is connected to the diaphragm of the second pump head 1200 (directly or indirectly). The motor 2000 drives the first eccentric wheel 2310 and the second eccentric wheel 2320 to rotate, and the diaphragms of the first pump head 1100 and the second pump head 1200 move correspondingly, so that the liquid can be pumped and discharged.

[0062] The above are only the preferred embodiments of the present application, and do not limit the patent scope of the present application. Any equivalent structural transformation made under the concept of the present application by using the content of the specification and drawings of the present application, or directly / indirectly applied in other related technical fields, is included in the patent protection scope of the present application.

Claims

1. A motor (2000), characterized in that, Comprising: A stator assembly (2200); A rotor assembly (2100), rotatably arranged relative to the stator assembly (2200), the rotor assembly (2100) including a rotating shaft (2130); A first eccentric wheel (2310), provided at one end of the rotating shaft (2130), the first eccentric wheel (2310) being adapted to act on a first pump head (1100) to cause the first pump head (1100) to pump and discharge fluid; And A second eccentric wheel (2320), provided at the other end of the rotating shaft (2130), the second eccentric wheel (2320) being adapted to act on a second pump head (1200) to cause the second pump head (1200) to pump and discharge fluid; A connecting line of the maximum distance from the rotation center of the first eccentric wheel (2310) to its circumferential surface in the radial direction is a first connecting line (2311), a connecting line of the maximum distance from the rotation center of the second eccentric wheel (2320) to its circumferential surface in the radial direction is a second connecting line (2321), and there is a deflection angle α between the first connecting line (2311) and the second connecting line (2321), satisfying α > 0°, so that the first eccentric wheel (2310) and the second eccentric wheel (2320) are arranged to deflect relative to each other.

2. The electric machine (2000) according to claim 1, characterized in that, The water inlet / outlet chambers (1300) of the first pump head (1100) and the water inlet / outlet chambers (1300) of the second pump head (1200) are N respectively, satisfying N≥3.

3. The motor (2000) according to claim 1, characterized in that, The first eccentric wheel (2310) and the second eccentric wheel (2320) are the same components.

4. The electric machine (2000) according to claim 1, characterized in that, The rotor assembly (2100) is rotatably arranged inside the stator assembly (2200), and the rotor assembly (2100) further includes: A support body (2110), the support body (2110) including a core part (2111) and tooth parts (2112), a plurality of the tooth parts (2112) are arranged around the core part (2111), an installation groove (2113) is provided between adjacent tooth parts (2112), and the rotating shaft (2130) is fixedly arranged through the core part (2111); and Permanent magnets (2120), a plurality of the permanent magnets (2120) are respectively arranged in a plurality of the installation grooves (2113), the permanent magnets (2120) include a first part (2121) and a second part (2122), the second part (2122) is arranged on a side of the first part (2121) away from the core part (2111), and the first part (2121) is tapered from the second part (2122) towards the core part (2111).

5. The electric machine (2000) according to claim 4, characterized in that, Both sides of the second part (2122) in the circumferential direction of the rotor assembly (2100) are parallel.

6. The motor (2000) according to claim 4, characterized in that, In the circumferential direction of the rotor assembly (2100), the midpoint between both sides of the first part (2121) is a first midpoint, the midpoint between both sides of the second part (2122) is a second midpoint, a first virtual plane (2140) is defined, the first virtual plane (2140) passes through the first midpoint, the second midpoint and the rotation axis of the rotor assembly (2100), and the first virtual plane (2140) constitutes the symmetry plane of the permanent magnet (2120).

7. The electric machine (2000) according to claim 4, characterized in that, The cross-section of the first part (2121) perpendicular to the rotation axis of the rotor assembly (2100) is a first cross-section, and the first cross-section is trapezoidal. The cross-section of the second part (2122) perpendicular to the rotation axis of the rotor assembly (2100) is a second cross-section, and the second cross-section is rectangular, and the corners on the side of the second cross-section facing away from the first part (2121) form rounded corners.

8. The electric machine (2000) according to claim 4, characterized in that, The maximum length of the permanent magnet (2120) along the radial direction of the rotor assembly (2100) is H1, and the maximum length of the first portion (2121) along the radial direction of the rotor assembly (2100) is H2, satisfying The minimum distance between the two circumferential sides of the first part (2121) along the rotor assembly (2100) is L2, and the maximum distance between the two circumferential sides of the second part (2122) along the rotor assembly (2100) is L1, satisfying where P is the number of pole pairs of the rotor assembly (2100), and R is the radius of the rotor assembly (2100).

9. The motor (2000) according to claim 4, characterized in that, Along the circumferential direction of the rotor assembly (2100), one side of the permanent magnet (2120) is the N pole and the other side is the S pole, and the polarities of the adjacent sides of the adjacent permanent magnets (2120) are the same.

10. A booster pump (100), characterized in that, Comprising a first pump head (1100), a second pump head (1200) and the motor (2000) according to any one of claims 1 to 9, the motor (2000) is adapted to act on the first pump head (1100) through the first eccentric wheel (2310) to cause the first pump head (1100) to pump and drain fluid, and the motor (2000) is adapted to act on the second pump head (1200) through the second eccentric wheel (2320) to cause the second pump head (1200) to pump and drain fluid.

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