Booster pump

Abstract

The utility model discloses a booster pump, relates to booster pump technical field, including pump head and motor, said motor is connected with the pump head, said motor includes rotor core and a plurality of permanent magnets, rotor core includes rotor yoke and a plurality of rotor teeth, a plurality of rotor teeth are provided on the outer peripheral surface of rotor yoke at interval, the permanent magnets are provided with a plurality of permanent magnets, the permanent magnets are provided with a plurality of permanent magnets, the permanent magnets are provided with a plurality of permanent magnets. Two adjacent rotor teeth and the rotor yoke enclose to form a mounting groove, one permanent magnet is correspondingly mounted in one mounting groove, the sum of the sectional areas of the plurality of permanent magnets in the radial direction of the rotor core is S1, the sectional area of the rotor core in the radial direction is S2, and S1 / S2 is more than 0.45 and less than 0.55; according to the technical scheme provided by the utility model, the axial size of the motor is reduced, and the efficiency of the motor and the booster pump 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 prior art, the length of the motor shaft in the axial direction is relatively long, resulting in a relatively large size of the motor shaft in the axial direction. However, when reducing the size of the motor shaft in the axial direction, the size of the permanent magnet in the motor will be reduced, resulting in a reduction in the magnetic flux of the motor, and further resulting in a reduction in the rotational speed and torque of the motor, thereby reducing the efficiency of the motor and the booster pump. Summary of the Utility Model

[0003] The main object of the utility model is to provide a booster pump, aiming to reduce the axial size of the motor and improve the efficiency of the motor and the booster pump.

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

[0005] A pump head; and

[0006] A motor, the motor is connected to the pump head, the motor includes a rotor core and a plurality of permanent magnets, the rotor core includes a rotor yoke and a plurality of rotor teeth, the plurality of rotor teeth are spaced on the outer peripheral surface of the rotor yoke, an installation groove is formed by enclosing two adjacent rotor teeth and the rotor yoke, and a permanent magnet is correspondingly installed in an installation groove, and the sum of the cross-sectional areas of the plurality of permanent magnets in the radial direction of the rotor core is S 1 , the cross-sectional area of the rotor core in the radial direction is S 2 , 0.45 < S 1 / S 2 < 0.55.

[0007] In one embodiment, 680 mm 2 ≤ S 1 ≤ 800 mm 2 .

[0008] In one embodiment, 1200 mm 2 ≤ S 2 ≤ 1800 mm 2 .

[0009] In one embodiment, there are 10 permanent magnets.

[0010] In one embodiment, the length of the permanent magnet in the radial direction of the rotor core is L 1 , 10 mm ≤ L 1 ≤ 20 mm.

[0011] In one embodiment, the thickness of the permanent magnet is t, and 3.5 mm ≤ t ≤ 6.3 mm.

[0012] In one embodiment, the length of the permanent magnet in the axial direction of the rotor core is L 2 , 30 mm ≤ L 2 ≤ 45 mm.

[0013] In one embodiment, both ends of the permanent magnet in the axial direction of the rotor core protrude from the rotor core.

[0014] In one embodiment, the length by which one end of the permanent magnet protrudes from the rotor core is L 3 , L 3 =(L 2 -Z 1 ) / 2, 2.5 mm ≤ L 3 ≤ 3.5 mm.

[0015] In one embodiment, the rotor further includes a rotating shaft. An axial hole is provided on the rotor core, and the rotating shaft is rotatably connected to the axial hole. The length of the rotating shaft is Z 1 , 2 ≤ Z 1 / L 2 ≤ 3.

[0016] In one embodiment, the distance between adjacent permanent magnets at one end facing the axial hole is d 1 , 0.8 mm ≤ d 1 ≤ 1.5 mm.

[0017] In one embodiment, the distance between adjacent permanent magnets at one end away from the axial hole is d 2 , 7 mm ≤ d 2 ≤ 12 mm.

[0018] The booster pump in the technical solution of the present utility model includes a pump head and a motor. The motor is connected to the pump head. The motor includes a rotor core and a plurality of permanent magnets. The rotor core includes a rotor yoke and a plurality of rotor teeth. The plurality of rotor teeth are spaced on the outer peripheral surface of the rotor yoke. An installation groove is formed by enclosing the rotor yoke with two adjacent rotor teeth. A permanent magnet is correspondingly installed in an installation groove. The sum of the cross-sectional areas of the plurality of permanent magnets in the radial direction of the rotor core is S 1 , and the cross-sectional area in the radial direction of the rotor core is S 2 , 0.45 < S 1 / S 2< 0.55. Compared with the permanent magnet in the prior art, the cross-sectional area of the permanent magnet in the technical solution of the present invention in the radial direction of the rotor core is increased, and at the same time, the length of the rotor core in the axial direction is shortened, thereby reducing the axial dimension of the motor. At the same time, by setting the size relationship between S 1 and S 2 within the range of 0.45 < S 1 / S 2 < 0.55, by reasonably setting the sizes of the rotor core and the permanent magnet, the magnetic flux of the motor is increased, the motor speed is reasonably increased, the torque is increased, and the efficiency of the motor and the booster pump is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention 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 invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0020] Figure 1 FIG. is a schematic structural diagram of an embodiment of a booster pump provided by the present invention;

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

[0022] Figure 3 is Figure 1 a schematic structural diagram of another perspective view of the motor rotor in;

[0023] Figure 4 is Figure 1 a schematic structural diagram of yet another perspective view of the motor rotor in;

[0024] Figure 5 is Figure 4 an enlarged view of part A in.

[0025] Explanation of the reference numerals in the drawings:

[0026] 1. Pump head.

[0027] 2. Motor; 21. Rotor core; 211. Rotor yoke; 212. Rotor teeth; 213. Magnetic bridge; 214. Installation groove; 215. Support protrusion; 216. Groove; 217. Shaft hole; 22. Permanent magnet; 23. Rotating shaft.

[0028] The realization of the object, functional characteristics and advantages of the present invention will be further described with reference to the embodiments and the drawings. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0029] The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0030] 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.

[0031] 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 the 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 protection scope required by the present utility model.

[0032] In the prior art, the length of the motor 2 in the axial direction is relatively long, resulting in a relatively large size of the motor 2 in the axial direction. However, when reducing the axial size of the motor 2, it will cause a decrease in the size of the permanent magnet 22 in the motor 2, thereby resulting in a decrease in the magnetic flux of the motor 2, and further resulting in a decrease in the rotational speed and torque of the motor 2, and further reducing the efficiency of the motor 2 and the booster pump.

[0033] Referring to Figure 1 、 Figure 3 and Figure 4 , in order to solve this technical problem, the present utility model proposes a booster pump, including:

[0034] a pump head 1; and

[0035] The motor 2 is connected to the pump head 1. The motor 2 includes a rotor core 21 and a plurality of permanent magnets 22. The rotor core 21 includes a rotor yoke 211 and a plurality of rotor teeth 212. The plurality of rotor teeth 212 are spaced apart on the outer peripheral surface of the rotor yoke 211. An installation groove 214 is formed by enclosing the rotor yoke 211 between two adjacent rotor teeth 212. One permanent magnet 22 is correspondingly installed in one installation groove 214. The sum of the cross-sectional areas of the plurality of permanent magnets 22 in the radial direction of the rotor core 21 is S 1 The cross-sectional area of the rotor core 21 in the radial direction is S 2 , 0.45 < S 1 / S 2 < 0.55.

[0036] The booster pump in the technical solution of the present invention includes a pump head 1 and a motor 2. The motor 2 is connected to the pump head 1. The motor 2 includes a rotor core 21 and a plurality of permanent magnets 22. The rotor core 21 includes a rotor yoke 211 and a plurality of rotor teeth 212. The plurality of rotor teeth 212 are spaced apart on the outer peripheral surface of the rotor yoke 211. An installation groove 214 is formed by enclosing the rotor yoke 211 between two adjacent rotor teeth 212. One permanent magnet 22 is correspondingly installed in one installation groove 214. The sum of the cross-sectional areas of the plurality of permanent magnets 22 in the radial direction of the rotor core 21 is S 1 The cross-sectional area of the rotor core 21 in the radial direction is S 2 , 0.45 < S 1 / S 2 < 0.55. Compared with the permanent magnet 22 in the prior art, the cross-sectional area of the permanent magnet 22 in the radial direction of the rotor core 21 is increased in the technical solution of the present invention, and at the same time, the length of the rotor core 21 in the axial direction is shortened, thereby reducing the axial dimension of the motor 2. At the same time, by setting the dimensional relationship between S 1 and S 2 within 0.45 < S 1 / S 2 < 0.55, the magnetic flux of the motor 2 is improved by reasonably setting the dimensions of the rotor core 21 and the permanent magnet 22, and then the rotational speed and torque of the motor 2 are reasonably increased, and further the efficiency of the motor 2 and the booster pump is improved.

[0037] Specifically, 680 mm 2 ≤ S 1 ≤ 800 mm 2 . It can be understood that when S 1When it increases, the magnetic field intensity of the motor 2 will increase correspondingly, which helps the motor 2 generate a stronger electromagnetic torque, thereby improving the power and efficiency of the motor 2. At the same time, a larger cross-sectional area of the permanent magnet 22 means a larger magnetic flux area of the permanent magnet 22. In the motor 2, the increase in magnetic flux helps to increase the magnetic flux density of the motor 2, thereby enhancing the electromagnetic performance of the motor 2. However, when S 1 > 800 mm 2 At this time, although the magnetic flux density of the motor 2 will be very large, a relatively larger rotor core 21 is required, which will increase the size of the motor 2. At the same time, the larger permanent magnet 22 will also increase the material consumption of the permanent magnet, thereby increasing the production and manufacturing costs of the permanent magnet 22 and the motor 2. When S 1 < 680 mm 2 , at this time, the magnetic flux and magnetic flux density of the permanent magnet 22 may not meet the predetermined requirements, thereby reducing the power and efficiency of the motor 2.

[0038] Specifically, 1200 mm 2 ≤ S 2 ≤ 1800 mm 2 . It can be understood that a larger cross-sectional area of the rotor core 21 can reduce the leakage of magnetic flux, improve the magnetic flux utilization efficiency, and thereby enhance the overall efficiency of the motor 2. At the same time, the increase in the cross-sectional area of the rotor core 21 also means an increase in the volume of the rotor core 21, which improves the heat dissipation performance of the motor 2 to a certain extent. However, when S 2 > 1800 mm 2 At this time, it will cause the volume of the rotor core 21 to increase, and at the same time, it will also increase the material consumption of the rotor core 21, thereby increasing the production and manufacturing costs of the rotor core 21 and the motor 2, and at the same time, it will also increase the volume of the motor 2, which is not conducive to the miniaturization of the motor 2. When S 2 < 1200 mm 2 At this time, it will cause poor heat dissipation effect of the motor 2 and low magnetic flux utilization rate.

[0039] Specifically, the length of the permanent magnet 22 in the radial direction of the rotor core 21 is L 1 , 10 mm ≤ L 1 ≤ 20 mm. When L 1 > 20 mm, at this time, the length of the permanent magnet 22 in the radial direction of the rotor core 21 is too long, which will increase the magnetic flux path of the permanent magnet 22. However, too long a magnetic flux path will cause the accumulation of heat inside the motor 2, thereby increasing the temperature rise of the motor 2, which is not conducive to the heat dissipation of the permanent magnet 22, and thus reducing the stability and service life of the motor 2. When L 1 < 10 mm, at this time, it will cause the size of the permanent magnet 22 to be too small, resulting in insufficient magnetic flux of the motor 2, thereby reducing the rotational speed and torque of the motor 2, and thus reducing the efficiency of the motor 2 and the booster pump.

[0040] In one embodiment, the thickness of the permanent magnet 22 is t, where 3.5 mm ≤ t ≤ 6.3 mm. It can be understood that appropriately increasing the thickness of the permanent magnet 22 can reduce the pole pitch of the permanent magnetic poles, which is beneficial to improving the magnetic focusing effect. At the same time, appropriately increasing the thickness of the permanent magnet 22 can also increase the magnetic flux density of the motor 2, thereby increasing the torque of the motor 2, improving the output power of the motor 2, and further improving the efficiency of the motor 2 and the booster pump. However, when t > 6.3 mm, magnetic circuit saturation may occur, resulting in an increase in magnetic circuit losses and reducing the efficiency of the motor 2 instead. At the same time, excessively increasing the thickness of the permanent magnet 22 will also increase the material consumption of the permanent magnet 22, thus increasing the cost of the permanent magnet 22. When t < 3.5 mm, the size of the permanent magnet 22 will be too small, resulting in insufficient magnetic flux of the motor 2, reducing the rotational speed and torque of the motor 2, and further reducing the efficiency of the motor 2 and the booster pump.

[0041] Refer to Figure 5 In one embodiment, the interval between the permanent magnet 22 and the wall of the installation groove 214 is s, where 0.05 mm ≤ s ≤ 0.15 mm. It can be understood that the gap between the permanent magnet 22 and the wall of the installation groove 214 is the magnetic gap, and the size of the magnetic gap directly affects the efficiency of the motor 2. Theoretically, the smaller the magnetic gap, the greater the relative magnetic field strength, which helps to reduce the magnetic resistance between the rotor and the stator, thereby improving the efficiency of the motor 2. At the same time, the size of the magnetic gap also affects the noise and vibration of the motor 2; the smaller the magnetic gap, the smaller the noise of the motor 2 usually is, because the vibration generated by the magnetic field change on the adjacent metal parts will be converted into smaller sound waves; finally, a smaller magnetic gap can increase the magnetic field strength, thereby increasing the output torque of the motor 2, and further improving the efficiency of the motor 2 and the booster pump. However, when s < 0.05 mm, the magnetic gap will be too small, and the too small magnetic gap may cause an increase in rotor eddy current losses and a relatively serious cogging effect, reducing the efficiency of the motor 2 instead. At the same time, the too small magnetic gap will increase the installation difficulty of the permanent magnet 22, making the permanent magnet 22 prone to rubbing against the wall of the installation groove 214 during installation, thus shortening the life of the permanent magnet 22 and further shortening the life of the motor 2.

[0042] Further, after the permanent magnet 22 is located in the installation groove 214, injection molding plastic is injected into the installation groove 214 to fix the permanent magnet 22. Compared with the installation method of fixing the permanent magnet 22 with screws, the fixing effect of the injection molding plastic is better, and the injection molding plastic is flexible and not easy to scratch the outer surface of the permanent magnet 22, while the screw connection is easy to scratch the permanent magnet 22, which will change the magnetic flux path inside the permanent magnet 22 and reduce the efficiency of the motor 2. At the same time, the quality of the injection molding plastic is smaller, thus also reducing the weight of the motor 2 and the booster pump.

[0043] Among them, the injection molding material includes PBT and glass fiber (GF) to have higher heat resistance, better tensile strength and flexural strength to adapt to the normal operation of the motor 2 under different working conditions. Further, the injection molding is provided on the outer periphery of the rotor, which helps to improve the connection strength between the rotor core 21 and the permanent magnet 22.

[0044] In an embodiment, there are 10 permanent magnets 22, and one permanent magnet 22 is arranged corresponding to one mounting groove 214. That is, the number of pole pairs of the rotor is 5. First, as the number of pole pairs increases, the magnetic flux per pole decreases, which is beneficial to reducing the winding inductance and the thickness of the stator yoke, thereby improving the power density of the motor 2, so that the motor 2 has a large power range and can achieve high-power output. Second, the fact that the number of pole pairs of the rotor is 5 also indicates that the torque of the rotor is relatively large, which is suitable for occasions with heavy loads, and its large torque can ensure stable operation under heavy loads. Third, the motor 2 with 5 pole pairs of the rotor has a wide speed range and can adapt to different working environments. This characteristic enables the motor 2 with 5 pole pairs to perform excellently in a variety of application scenarios. Further, the five-pole-pair motor 2 starts smoothly and has low noise. The five-pole motor 2 shows good smoothness during startup and has low noise. This is mainly due to its internal permanent magnet synchronous motor 2 design and precise encoder feedback control. Finally, the motor 2 with 5 pole pairs of the rotor has high efficiency and has a high efficiency during operation.

[0045] In an embodiment, the motor 2 includes a stator and a rotor. The stator is connected to the pump head 1. The rotor includes a rotor core 21, a permanent magnet 22 and a rotating shaft 23. The rotating shaft 23 is installed on the rotor core 21, and the rotor core 21 is rotatably connected to the inside of the stator through the rotating shaft 23. The rotor core 21 includes a rotor yoke 211, a plurality of rotor teeth 212 and a plurality of magnetic bridges 213. The plurality of magnetic bridges 213 are spaced on the outer peripheral surface of the rotor yoke 211. The rotor teeth 212 are connected to the rotor yoke 211 through the magnetic bridges 213. One rotor tooth 212 is arranged corresponding to one magnetic bridge 213. An installation groove 214 is formed between two adjacent rotor teeth 212. A support protrusion 215 is provided on the outer peripheral surface of the rotor yoke 211. The permanent magnet 22 is installed in the installation groove 214 and abuts against the support protrusion 215.

[0046] In this embodiment, there is one support protrusion corresponding to the permanent magnet 22 and it is located on the center line of the rotor core 21, which improves the force uniformity of the permanent magnet 22 and ensures the stable installation of the permanent magnet 22.

[0047] In another embodiment, when meeting the requirement of lightening the weight of the rotor, a plurality of the supporting protrusions are provided corresponding to the permanent magnets 22 and are symmetrically arranged with respect to the center line of the rotor core 21, ensuring uniform force on the permanent magnets 22 and improving the connection strength between the permanent magnets 22 and the rotor core 21.

[0048] Preferably, in the axial direction of the rotor core 21, a plurality of the supporting protrusions are arranged at intervals. In this way, not only can the overall weight of the rotor be reduced, but also it is beneficial to cut off the magnetic flux between two adjacent supporting protrusions, reduce magnetic flux leakage, and improve the efficiency and performance of the motor 2.

[0049] Further, the side of the supporting protrusion facing the permanent magnet 22 is arc-shaped. Compared with the surface being flat, it can maximize the contact area between the supporting protrusion and the permanent magnet 22, help reduce the stress at the first end, and at the same time ensure the stable installation of the permanent magnet 22 in the installation groove 214.

[0050] In the embodiment of the present utility model, the rotor teeth 212 and the outer peripheral wall of the rotor yoke 211 are connected by magnetic bridges 213. Grooves 216 are formed between two adjacent magnetic bridges 213 and the rotor yoke 211. The supporting protrusions are connected to the bottom wall of the grooves 216. On the one hand, it can improve the overall structural strength of the rotor core 21 and facilitate the assembly of the rotor core 21 and the permanent magnets 22. On the other hand, due to the formation of the grooves 216, compared with the two magnetic bridges 213 being connected together, it is convenient to improve the magnetic flux leakage of the magnetic flux on the rotor core 21 passing through the magnetic bridges 213 to the rotor yoke 211 and reduce the rotor weight.

[0051] Wherein, in the axial direction of the rotor core 21, the thickness of the magnetic bridge 213 can be less than the thickness of the rotor core 21, further reducing magnetic flux leakage, thereby effectively improving the efficiency and performance of the motor 2.

[0052] In an embodiment, the length of the permanent magnet 22 in the axial direction of the rotor core 21 is L 2 , and 30 mm ≤ L 2 ≤ 45 mm. Compared with the permanent magnet 22 in the prior art, in the technical solution of the present utility model, the length of the permanent magnet 22 in the axial direction of the rotor core 21 is shortened, thereby reducing the volume of the motor 2 in the axial direction of the rotor core 21, and further facilitating the miniaturization of the motor 2 and the booster pump. Therefore, if L 2 > 45 mm, it will cause the length of the permanent magnet 22 in the axial direction of the rotor core 21 to be too long, further increasing the size of the motor 2 in the axial direction and being unfavorable for the miniaturization of the motor 2. If L 2 < 30 mm, it will cause the length of the permanent magnet 22 to be too small, resulting in insufficient magnetic flux of the permanent magnet 22, and further reducing the rated power and output power of the motor 2.

[0053] Specifically, the rotor further includes a rotating shaft 23. An axial hole 217 is provided on the rotor core 21. The rotating shaft 23 is rotatably connected to the axial hole 217, and the length of the rotating shaft 23 is Z 2 , 2 ≤ Z 2 / L 2 ≤ 3. It can be understood that if the axial length of the permanent magnet 22 is too short relative to the length of the rotating shaft 23, it may lead to a too short magnetic flux path, with a small magnetic resistance, but the magnetic flux density may be insufficient, affecting the performance of the motor 2. On the contrary, if the axial length of the permanent magnet 22 is too long, it may increase the magnetic resistance of the magnetic flux path and interpolar leakage flux, also having a negative impact on the performance of the motor 2. At the same time, an overly long rotating shaft 23 will cause a decrease in the torque of the motor 2; on the contrary, if the length of the rotating shaft 23 is too small, it may cause the motor 2 to be subjected to greater stress during high-speed operation, thereby increasing the wear of the rotating shaft 23 and the bearings and shortening the service life of the motor 2. Therefore, the length of the rotating shaft 23 and the length of the permanent magnet 22 in the axial direction of the rotor core 21 are set within the range of 2 ≤ Z 2 / L 2 ≤ 3, so as to improve the torque and power of the motor 2 by reasonably setting the dimensions, and further improve the service life of the motor 2

[0054] In an embodiment, both ends of the permanent magnet 22 in the axial direction of the rotor core 21 protrude from the rotor core 21. First, setting the permanent magnet 22 to protrude from the rotor core 21 enables the permanent magnet 22 to be directly exposed to the air, so that the heat dissipation performance of the permanent magnet 22 is better, which helps to reduce the temperature rise of the motor 2 and improve the thermal stability and reliability of the motor 2. Second, setting the permanent magnet 22 to protrude from the rotor core 21 simplifies the processing technology of the motor 2 and reduces the production and manufacturing cost of the motor 2

[0055] First, the length of the permanent magnet 22 protruding from the rotor core 21 will directly affect the magnetic field distribution of the motor 2; the longer the protruding length, the more sinusoidal the air-gap magnetic density distribution of the motor 2, which helps to reduce harmonics and vibrations during the operation of the motor 2, thereby reducing the noise generated during the operation of the motor 2. Second, the change in the magnetic field distribution will also affect the torque and efficiency of the motor 2; an appropriate protruding length can provide a more uniform magnetic field distribution, thereby improving the torque and efficiency of the motor 2. However, if the protruding length of the permanent magnet 22 is too long, it may increase the magnetic resistance and leakage flux of the motor 2, thereby reducing the efficiency of the motor 2; at the same time, the too long protruding length may cause the permanent magnet 22 to be subjected to more thermal stress, affecting its performance and life. Therefore, in an embodiment, the length of one end of the permanent magnet 22 protruding from the rotor core 21 is L 3 , L 3 =(L 2 -Z 1 ) / 2, 2.5 mm ≤ L3 ≤3.5 mm. Thus, the length by which one end of the permanent magnet 22 protrudes from the rotor core 21 is within a reasonable range, thereby improving the efficiency of the motor 2, reducing the noise generated by the motor 2, and enhancing the performance and service life of the motor 2.

[0056] Furthermore, the distance between two adjacent ones of the permanent magnets 22 at the end facing the shaft hole 217 is d 1 , 0.8 mm ≤ d 1 ≤ 1.5 mm. The distance between two adjacent permanent magnets 22 at the end facing the shaft hole 217 is also part of the magnetic gap, and the size of the magnetic gap directly affects the efficiency of the motor 2. In theory, the smaller the magnetic gap, the greater the relative magnetic field strength, which helps reduce the magnetic resistance between the rotor and the stator, thereby improving the efficiency of the motor 2. At the same time, the size of the magnetic gap also affects the noise and vibration of the motor 2; the smaller the magnetic gap, the generally smaller the noise of the motor 2 because the vibration generated by the magnetic field change on the adjacent metal parts will be converted into smaller sound waves; finally, a smaller magnetic gap can increase the magnetic field strength, thereby increasing the output torque of the motor 2, and further improving the efficiency of the motor 2 and the booster pump. When d 1 < 0.8 mm, it will cause the distance between two adjacent permanent magnets 22 at the end facing the shaft hole 217 to be too small, and the too small distance will cause the magnetic field to be too concentrated locally, making the magnetic field distribution uneven, thereby reducing the efficiency of the motor 2 and the booster pump.

[0057] Furthermore, the distance between two adjacent ones of the permanent magnets 22 at the end away from the shaft hole 217 is d 2 , 7 mm ≤ d 2 ≤ 12 mm. The distance between two adjacent permanent magnets 22 at the end away from the shaft hole 217 is also part of the magnetic gap, and the size of the magnetic gap directly affects the efficiency of the motor 2. In theory, the smaller the magnetic gap, the greater the relative magnetic field strength, which helps reduce the magnetic resistance between the rotor and the stator, thereby improving the efficiency of the motor 2. At the same time, the size of the magnetic gap also affects the noise and vibration of the motor 2; the smaller the magnetic gap, the generally smaller the noise of the motor 2 because the vibration generated by the magnetic field change on the adjacent metal parts will be converted into smaller sound waves; finally, a smaller magnetic gap can increase the magnetic field strength, thereby increasing the output torque of the motor 2, and further improving the efficiency of the motor 2 and the booster pump. When d 2 < 7 mm, it will cause the distance between two adjacent permanent magnets 22 at the end away from the shaft hole 217 to be too small. At this time, the magnetic field may leak outside the motor 2 without being fully utilized, which not only reduces the magnetic field efficiency inside the motor 2 but also may cause unnecessary electromagnetic interference to the surrounding environment, thereby reducing the usage effect of the motor 2 and the booster pump and the user experience.

[0058] The above are only exemplary embodiments of the present utility model, and do not limit the patent scope of the present utility model accordingly. Any equivalent structural transformation made under the technical concept of the present utility model by using the content of the specification and drawings of the present utility model, or any direct / indirect application in other related technical fields, 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, the motor comprising a rotor core and a plurality of permanent magnets, the rotor core comprising a rotor yoke and a plurality of rotor teeth, the plurality of rotor teeth being spaced apart on the outer circumferential surface of the rotor yoke, two adjacent rotor teeth being enclosed with the rotor yoke to form a mounting groove, one permanent magnet being correspondingly mounted in one mounting groove, the sum of the cross-sectional areas of the plurality of permanent magnets in the radial direction of the rotor core being S1, the cross-sectional area of ​​the rotor core in the radial direction being S2, 0.45<S1 / S2<0.

55.

2. The booster pump according to claim 1, characterized in that: 680mm 2 ≤S1≤800mm 2 。 3. The booster pump according to claim 1, characterized in that: 1200mm 2 ≤S2≤1800mm 2 。 4. The booster pump according to claim 1, characterized in that: There are 10 permanent magnets.

5. The booster pump according to claim 1, characterized in that: The length of the permanent magnet in the radial direction of the rotor core is L1, 10mm≤L1≤20mm.

6. The booster pump according to claim 1, characterized in that: The thickness of the permanent magnet is t, 3.5 mm≤t≤6.3 mm.

7. The booster pump according to claim 1, characterized in that: The length of the permanent magnet in the axial direction of the rotor core is L2, 30mm≤L2≤45mm.

8. The booster pump according to claim 7, characterized in that: Both ends of the permanent magnet along the axial direction of the rotor core are protruded from the rotor core.

9. The booster pump according to claim 8, characterized in that: The length of one end of the permanent magnet protruding from the rotor core is L3, L3 = (L2 - Z1) / 2, 2.5 mm ≤ L3 ≤ 3.5 mm.

10. The booster pump according to claim 7, characterized in that: The rotor further includes a rotating shaft. The rotor core is provided with an axial hole. The rotating shaft is rotatably connected to the axial hole. The length of the rotating shaft is Z1, 2≤Z1 / L2≤3.

11. The booster pump according to claim 10, characterized in that: The distance between two adjacent permanent magnets facing one end of the shaft hole is d1, and 0.8mm≤d1≤1.5mm.

12. The booster pump according to claim 10, characterized in that: The distance between two adjacent permanent magnets away from one end of the shaft hole is d2, 7mm≤d2≤12mm.

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