Booster pump and water drinking equipment

Abstract

The utility model discloses a booster pump and drinking water equipment, and relates to the technical field of water pumps, the booster pump comprises a pump head and a motor, the motor is used for driving the pump head, the motor comprises a stator, and the stator is coated with plastic; the rotor is rotationally arranged in the stator, the rotor comprises a rotor yoke, a plurality of rotor teeth are uniformly arranged on the periphery of the rotor yoke at intervals, the rotor teeth are connected to the peripheral wall of the rotor yoke through magnetic bridges, a mounting groove is formed between every two adjacent rotor teeth, and a permanent magnet is arranged in each mounting groove; wherein the rotor teeth are provided with at least one through groove, the length direction of the through groove is parallel to the axial direction of the rotor, the sectional area of the through groove in the length direction is S1, a supporting convex part is arranged in the mounting groove, the space between every two adjacent magnetic bridges is divided into two weight reduction empty grooves by the supporting convex part, the sectional area of each weight reduction empty groove in the length direction is S2, and S1 / S2 is larger than or equal to 1.5 and smaller than or equal to 4; according to the technical scheme provided by the utility model, the mass of the rotor is greatly reduced.

Description

Technical Field

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

[0002] A booster pump needs to be driven by an external device to boost the pressure of a gas-phase or liquid-phase medium. Generally, an electric motor is used as the external device. At present, some booster pumps have integrated their pump bodies with the electric motor; however, although the volume is reduced after the integration of the electric motor and the booster pump, the overall mass is relatively large, which may cause inconvenience in use or installation. Summary of the Utility Model

[0003] The main object of the utility model is to propose a booster pump, aiming to reduce the overall mass of the booster pump.

[0004] To achieve the above object, the booster pump proposed by the utility model includes a pump head and an electric motor for driving the pump head. The electric motor includes

[0005] a stator, which is coated;

[0006] a rotor, which is rotatably arranged in the stator. The rotor includes a rotor yoke, and a plurality of rotor teeth are evenly spaced on the outer periphery of the rotor yoke. The rotor teeth are connected to the outer peripheral wall of the rotor yoke through magnetic bridges. An installation groove is formed between two adjacent rotor teeth, and a permanent magnet is arranged in the installation groove;

[0007] Wherein, at least one through groove is formed in the rotor tooth, the length direction of the through groove is parallel to the axial direction of the rotor, the cross-sectional area of the through groove in its length direction is S1, glue injection holes are formed on the side walls of the rotor tooth forming the installation groove, the through groove is located between the connection line of the two glue injection holes in the same rotor tooth and the end of the rotor tooth away from the rotor yoke, a support convex part is arranged in the installation groove, the support convex part is arranged on the outer periphery of the rotor yoke, and the support convex part is used to provide support for the permanent magnet; the support convex part divides the space between two adjacent magnetic bridges into two weight reduction empty grooves, the cross-sectional area of the weight reduction empty groove in its length direction is S2, and 1.5≤S1 / S2≤4.

[0008] In an embodiment, the support convex part is arranged along the radial direction of the rotor yoke, and the support convex part is tapered towards the permanent magnet.

[0009] In an embodiment, the support convex part has a first end located in the installation groove and supporting the permanent magnet and a second end connected to the rotor yoke. The width of the first end is A1, and the width of the second end is A2, and 0.3≤A1 / A2≤0.5.

[0010] In one embodiment, the width of the permanent magnet is A3, and 5 ≤ A3 / A1 < 8.

[0011] In one embodiment, the two side edges of the support convex portion have a first angle α, and 15° ≤ α ≤ 25°.

[0012] In one embodiment, grooves are formed between two adjacent magnetic bridges and the rotor yoke, the support convex portion is connected to the bottom of the groove, and the support convex portion divides the groove into two weight-reducing empty grooves.

[0013] In one embodiment, there is a second angle β between two adjacent magnetic bridges, and 3α / 2 ≤ β ≤ 2α.

[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 installation groove;

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

[0016] In one embodiment, multiple through grooves are arranged in the rotor teeth along the radial direction of the rotor yoke, and the cross-sectional pattern of the through groove in its length direction is one of a polygon or a circle.

[0017] In one embodiment, the cross-section of the through groove in its length direction is an isosceles trapezoid, and the ratio of the length of the upper base to the lower base of the isosceles trapezoid is 1:(1.5 - 2.5).

[0018] In one embodiment, the length of the upper base of the isosceles trapezoid is 1.8 mm, the length of the lower base of the isosceles trapezoid is 3.6 mm, and the difference between the length of the lower base of the isosceles trapezoid and the height of the isosceles trapezoid is not greater than 0.3 mm.

[0019] In one embodiment, the axis of symmetry of the isosceles trapezoid coincides with the axis of symmetry of the rotor tooth, and the waist line of the isosceles trapezoid is parallel to the plane where the side wall of the adjacent installation groove is located.

[0020] The present utility model also provides a drinking water device, including the above-mentioned booster pump.

[0021] The technical solution of the present utility model forms weight-reducing empty grooves by arranging through grooves on the rotor teeth and arranging support convex portions between two adjacent rotor teeth, thereby greatly reducing the mass of the rotor itself, that is, greatly reducing the weight of the motor, and further facilitating the use and installation of the overall structure. Description of the Drawings

[0022] 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 drawings in the following description 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.

[0023] Figure 1 Structural schematic diagram of the booster pump provided by the present invention;

[0024] Figure 2 For Figure 1 Structural schematic diagram of the rotor of the motor in;

[0025] Figure 3 For Figure 2 Side view of the rotor from the first perspective in;

[0026] Figure 4 For Figure 2 Side view of the rotor from the second perspective in;

[0027] Figure 5 Structural schematic diagram of the rotor yoke and rotor teeth in the present invention;

[0028] Figure 6 Structural schematic diagram of the rotor yoke and rotor teeth from another perspective in the present invention;

[0029] Figure 7 Magnetic induction intensity diagram at various parts of the rotor of the present invention.

[0030] Explanation of the reference numerals in the drawings:

[0031] 100. Motor; 10. Rotor; 11. Rotor yoke; 12. Rotor teeth; 13. Installation groove; 131. Side wall; 132. Glue injection hole; 14. Support protrusion; 141. First end; 142. Second end; 15. Magnetic bridge; 16. Groove; 161. Weight reduction empty groove; 17. Through groove; 20. Permanent magnet; 200. Pump head.

[0032] The realization of the object, functional features and advantages of the present invention will be further described with reference to the embodiments and the drawings. Detailed implementation manners

[0033] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts belong to the scope of protection of the present invention.

[0034] 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, then such directional indications are only used to explain the relative positional relationship, movement conditions, etc. between components in a specific posture. If the specific posture changes, then the directional indications will also change accordingly.

[0035] In addition, if there are descriptions such as "first", "second", etc. involved in the embodiments of the present utility model, then such descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first", "second" may explicitly or implicitly include at least one such feature. In addition, if "and / or" or "and / or" appears throughout the text, its meaning includes three parallel scenarios. Taking "A and / or B" as an example, it includes scenario A, or scenario B, or the scenario where both A and B are satisfied simultaneously. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0036] In a drinking water device, a booster pump is often required to boost the pressure of water so that the water can complete purification and heating steps through structures such as reverse osmosis filter elements and then reach the water outlet end for supply to users for drinking.

[0037] Currently, in order to further reduce the occupied space of the drinking water device, the overall drinking water device has a trend of miniaturization. Therefore, there has emerged a technology of integrating the motor 100 on the pump head 200 of the booster pump, that is, integrating the motor 100 that provides power for the booster pump on the booster pump, thereby reducing the volume of the overall structure of the booster pump. However, due to this, because of the high integration of the booster pump, the mass of the booster pump per unit volume will increase, which may in turn bring inconveniences in installation, design, and use.

[0038] To solve the above problems, the present utility model proposes a booster pump, which includes a pump head 200 and a motor 100. The motor 100 is used to drive the pump head 200, and the two are highly integrated. In the present utility model, the motor 100 includes a stator and a rotor 10. The stator is integrally coated with plastic, and the rotor 10 is rotatably arranged inside the stator. Among them, the rotor 10 includes a rotor yoke 11. A plurality of rotor teeth 12 are evenly spaced on the outer periphery of the rotor yoke 11. The rotor teeth 12 are connected to the outer peripheral wall of the rotor yoke 11 through a magnetic bridge 15. An installation groove 13 is formed between two adjacent rotor teeth 12, and a permanent magnet 20 is arranged in the installation groove 13. Thus, when the stator is powered on, the permanent magnet 20 on the rotor 10 will drive the rotor 10 to rotate under the action of the magnetic field. In order to reduce the overall weight of the rotor 10, at least one through groove 17 is opened on the rotor teeth 12, and the length direction of the through groove 17 is parallel to the axial direction of the rotor 10. The opening of the through groove 17 reduces the mass of the rotor teeth 12. Thus, when the rotor 10 rotates as a whole, the inertia of the rotor teeth 12 is smaller, thereby reducing the possibility that the magnetic bridge 15 is structurally damaged due to excessive inertia of the rotor teeth 12 during the rotation of the rotor 10, and ensuring the structural integrity of the magnetic bridge 15.

[0039] In addition, glue injection holes 132 are opened on the side walls 131 of the rotor teeth 12 that form the installation groove 13, and a support protrusion 14 is arranged in the installation groove 13. The support protrusion 14 is arranged on the outer periphery of the rotor yoke 11, and the support protrusion 14 is used to provide support for the permanent magnet 20. The support protrusion 14 divides the space between two adjacent magnetic bridges 15 into two weight-reducing empty grooves 161. It should be noted that the whole rotor 10 can also be injected with glue (or injection molded), so as to cooperate with the plastic coating of the stator, reducing the possibility of the motor 100 being corroded by water ingress. When injecting glue, the glue liquid is injected from the glue injection holes 132 and continuously fills the installation groove 13. In the present utility model, the weight-reducing empty groove 161 actually belongs to the installation groove 13, and the support protrusion 14 provides support for the permanent magnet 20 in the installation groove 13. Thus, the glue liquid will also fill the weight-reducing empty groove 161 when injecting glue. The rotor teeth 12 and the rotor yoke 11 in the present utility model are both made of metal materials. Thus, the setting of the weight-reducing empty groove 161 is equivalent to reducing the overall metal volume of the rotor 10, that is, using rubber to replace part of the metal structure, thereby reducing the weight of the rotor 10 in disguise.

[0040] In the present invention, considering the change of the magnetic flux of the rotor 10 as a whole and the strength of the magnetic bridge 15, if the cross-sectional area of the through slot 17 in the length direction is S1, and the cross-sectional area of the weight-reducing slot 161 in the length direction is S2, then 1.5≤S1 / S2≤4, so that the cross-sectional area of the through slot 17 will not be too large to reduce the structural strength of the rotor tooth 12 itself, nor will the rotor tooth 12 be too heavy due to the through slot 17 being too small, resulting in the inability of the magnetic bridge 15 to support the rotor tooth 12; in addition, the through slot 17 is located between the line connecting the two injection holes 132 of the same rotor tooth 12 and the end of the rotor yoke 11 of the rotor tooth 12, that is, the opening position of the through slot 17 will not be too close to the rotor yoke 11; specifically, the cross-sectional area of the rotor tooth 12 in the axial direction of the rotor 10 is similar to a sector shape, and when the permanent magnet 20 is embedded in the mounting slot 13, the rotor 10 itself has a magnetic field, refer to Figure 7 The magnetic field strength at the through slot 17 and the end of the rotor tooth 12 close to the rotor yoke 11 is extremely low. When the through slot 17 is opened too close to the rotor yoke 11, the influence of the end of the rotor tooth 12 and the through slot 17 on the overall magnetic field of the rotor 10 will be superimposed, causing the overall magnetic field strength of the rotor 10 to decrease, thereby reducing the power of the motor 100.

[0041] It should be noted that, in the radial direction of the rotor 10, the support protrusion 14 has a first end 141 that supports the permanent magnet 20 and a second end 142 that connects to the rotor yoke 11, and the support protrusion 14 is set to be gradually reduced toward the permanent magnet 20, the width of the first end 141 is A1, and the width of the permanent magnet 20 is A3, then 5≤A3 / A1<8, and, on the radial cross section of the rotor 10, the sum of the areas Q1 of each permanent magnet 20 and the area Q2 of the rotor 10 satisfy: 0.45≤Q1 / Q2≤0.65, so as to improve the installation stability of the permanent magnet 20 while reducing the weight of the rotor 10. In addition, on the basis of the above-mentioned arrangement ensuring that the permanent magnet 20 is reliably assembled in the installation groove 13, the space occupied by the support protrusion 14 can be reduced to a certain extent, the overall weight of the rotor 10 can be reduced, and at the same time, the magnetic flux leakage can be reduced, thereby effectively improving the efficiency and performance of the motor 100.

[0042] Specifically, on the radial cross section of the rotor 10, the sum of the areas Q1 of the permanent magnets 20 and the area Q2 of the rotor 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 10, increase the magnet filling rate, thereby improving the magnetic flux density and power density of the motor 100, and further help to improve the efficiency and performance of the motor 100. Further, with the setting of 5≤A3 / A1<8, it is conducive to further improving the efficiency and performance of the motor 100, while achieving lightweight and miniaturization of the motor 100.

[0043] 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 rotor 10 uses less material, which easily affects the overall structural strength of the rotor 10. 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.

[0044] 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 10 be reduced, but also it helps to reduce the magnetic flux leakage from the rotor 10 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 in direct 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 this 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 10. Among them, this gap can be greater than or equal to 0.15 mm and less than or equal to 1 mm.

[0045] Optionally, in an embodiment of the present utility model, the width of the second end 142 is A2, 0.3 ≤ A1 / A2 ≤ 0.5, and it is defined that A1 > A2; specifically, when the ratio of A1 / A2 is too small, that is, 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, a low mating strength between the permanent magnet 20 and the rotor 10, an increased possibility of relative movement between the permanent magnet 20 and the rotor 10, and an inability to ensure the stable operation of the motor 100, and it is also easy 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, that is, A1 / A2 > 0.5, the width of the first end 141 is too large, which is likely to cause high stress at the first end 141 due to the increased contact area with the permanent magnet 20, and 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 10 is effectively reduced, the weight of the rotor 10 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 10.

[0046] 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.

[0047] It should be noted that the booster pump can be configured as a diaphragm booster pump. 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 electrical components with the plastic-encapsulated motor 100, effectively avoiding insulation problems caused by water vapor, water leakage, etc.

[0048] Optionally, in an 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 permanent magnet 20 by the support protrusion 14, the width of the first end 141 can be minimized as much as possible. Furthermore, the weight of the rotor 10 can be reduced, and the magnetic flux leakage from the permanent magnet 20 to the rotor yoke 11 through the support protrusion 14 can be reduced, improving the efficiency and performance of the motor 100.

[0049] Specifically, when the ratio of A3 / A1 is too small, that is, A3 / A1 < 5, the width of the first end 141 is too large, and it is easy to cause large stress at the first end 141 due to the increased contact area with the permanent magnet 20, which is not conducive to the structural stability of the first end 141 and is also not conducive to the miniaturization of the support protrusion 14; when the ratio of A3 / A1 is too large, that is, 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, a low mating strength between the permanent magnet 20 and the rotor 10, an increased possibility of relative movement between the permanent magnet 20 and the rotor 10, and is not conducive to 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 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 10 can be effectively reduced, the weight of the rotor 10 can be reduced, and the magnetic flux leakage can be reduced, thereby effectively improving the efficiency and performance of the motor 100.

[0050] 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.

[0051] Optionally, in an embodiment of the present invention, in the radial cross-section of the rotor 10, the radial length of the permanent magnet 20 is B, and 3 ≤ B / A3 ≤ 4. With this 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 10 can be determined, improving the efficiency and performance of the motor 100.

[0052] In an embodiment of the present utility model, the rotor teeth 12 are connected to the outer peripheral wall of the rotor yoke 11 through magnetic bridges 15. Grooves 16 are formed between two adjacent magnetic bridges 15 and the rotor yoke 11. The supporting convex portion 14 is connected to the bottom wall of the groove 16, that is, the supporting convex portion 14 divides the groove 16 into two weight-reducing empty grooves 161. On the one hand, it can improve the overall structural strength of the rotor 10 and facilitate the assembly of the rotor 10 and the permanent magnet 20. On the other hand, by forming the groove 16, compared with the two magnetic bridges 15 being connected together, it is convenient to improve the magnetic flux leakage on the rotor 10 from the magnetic bridges 15 to the rotor yoke 11 and reduce the weight of the rotor 10.

[0053] Wherein, in the axial direction of the rotor 10, the thickness of the magnetic bridge 15 can be smaller than the thickness of the rotor 10, further reducing magnetic flux leakage, thereby effectively improving the efficiency and performance of the motor 100.

[0054] Further, in an embodiment of the present utility model, the two side edges of the supporting convex portion 14 have a first angle α, and the second angle between two adjacent magnetic bridges 15 is β, 3α / 2≤β≤2α. Wherein, the second angle between two adjacent magnetic bridges 15 is equal to the central angle corresponding to the rotor teeth 12, and the first angle is smaller than the central angle corresponding to the rotor teeth 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 herein.

[0055] Combined with 0.3≤A1 / A2≤0.5, in an embodiment of the present utility model, 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.

[0056] Wherein, the specific angle of the first angle α includes but is not limited to 15°, 16°, 17°, 18°, 19°, 20°, 21°, 22°, 23°, 24°, 25°. In this embodiment, α = 20°.

[0057] Optionally, in an embodiment of the present utility model, the surface of the first end 141 facing the permanent magnet 20 is an arc surface. Compared with the case where the surface is a plane, it can support the contact area between the convex portion 14 and the permanent magnet 20 as much as possible, which helps to reduce the stress at the first end 141. At the same time, it ensures the stable installation of the permanent magnet 20 in the installation groove 13.

[0058] Optionally, in an embodiment of the present utility model, there is one support convex portion 14 corresponding to the permanent magnet 20, and it is located on the center line of the rotor 10, which improves the force uniformity of the permanent magnet 20 and ensures the stable installation of the permanent magnet 20.

[0059] In another embodiment, when meeting the requirement of light weight of the rotor 10, there are multiple support convex portions 14 corresponding to the permanent magnet 20, and they are symmetrically arranged about the center line of the rotor 10, which ensures the uniform force on the permanent magnet 20 and improves the connection strength between the permanent magnet 20 and the rotor 10.

[0060] Optionally, in an embodiment of the present utility model, in the axial direction of the rotor 10, there are multiple support convex portions 14 arranged at intervals. In this way, it can not only reduce the overall weight of the rotor 10, but also be beneficial to blocking the magnetic flux between two adjacent support convex portions 14, reducing magnetic flux leakage, and improving the efficiency and performance of the motor 100.

[0061] Optionally, in an embodiment of the present utility model, there is injection molding plastic filled between the rotor yoke 11 and the rotor teeth 12. At this time, an injection molding space for the injection molding plastic to flow in is formed between the groove wall of the groove 16 and the outer peripheral surface of the support convex portion 14, which is convenient for the injection molding plastic to flow in, and is beneficial to improving the connection strength between the rotor 10 and the permanent magnet 20. At the same time, compared with using additional fasteners to fix the whole rotor 10, the setting of the injection molding plastic is beneficial to reducing the volume of the rotor 10, and further realizing the miniaturization and light weight of the motor 100.

[0062] Among them, the injection molding material includes PBT and glass fiber (GF) to have high heat resistance, good tensile strength and bending strength to adapt to the normal operation of the motor 100 under different working conditions. Further, the injection molding plastic is arranged on the outer periphery of the rotor 10, which is beneficial to improving the connection strength between the rotor 10 and the permanent magnet 20.

[0063] Optionally, in an embodiment of the present utility model, in the axial direction of the rotor 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 10 and the stator coil, improve the efficiency and performance of the motor 100, and at the same time, optimize the magnetic field distribution, which is convenient for reducing magnetic field distortion and improving the operation stability and reliability of the motor 100.

[0064] Among them, the thickness h1 of the supporting convex portion 14 may be less than or equal to the thickness of the rotor 10.

[0065] Specifically, in the embodiment of the present invention, 0.8 ≤ h1 / h2 ≤ 1. Specifically, as Figure 4 shown, when h1 / h2 is greater than 1, it is easy to increase the volume of the rotor 10 under the same magnet filling rate, which is not conducive to the miniaturization of the rotor 10. When h1 / h2 is less than 0.8, the magnetic flux between the rotor 10 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 supporting 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. At the same time, the operation stability and reliability of the motor 100 are improved. In this embodiment, the thickness h1 of the supporting convex portion 14 may be less than or equal to the thickness of the rotor 10. However, in other embodiments, the thickness of the supporting convex portion 14 is less than the thickness of the rotor 10, and the recessed thicknesses of the supporting convex portion 14 at both ends of the rotor 10 are the same.

[0066] Furthermore, the protruding thicknesses of the permanent magnet 20 at both ends of the rotor 10 are the same, that is, in the axial direction of the rotor 10, the distance from the end face of one end of the permanent magnet 20 to the end face of the rotor 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 10 on the same side, which helps to improve the rotational stability of the rotor 10. In addition, when the rotor 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 10.

[0067] In the embodiment of the present invention, the opening of the through groove 17 also plays a role in reducing the overall weight of the rotor 10. Specifically, a plurality of through grooves 17 may be provided on the same rotor tooth 12, and the plurality of through grooves 17 are arranged radially along the rotor yoke 11 on the rotor tooth 12. In a preferred embodiment of the present invention, only one through groove 17 is provided on the rotor tooth 12. Combining the above description, considering the change of the overall magnetic flux of the rotor 10 and the strength of the magnetic bridge 15, if the cross-sectional area of the through groove 17 in its length direction is S1, and the cross-sectional area of the weight-reducing empty groove 161 in its length direction is S2, then 1.5 ≤ S1 / S2 ≤ 4, that is, the opening of one through groove 17 can not only meet the weight reduction requirements of the rotor 10 as a whole, but also avoid the influence on the magnetic field caused by opening a plurality of through grooves 17, thereby ensuring the magnetic field strength on the basis of meeting the weight reduction design of the rotor 10.

[0068] The through slot 17 can be designed in various shapes, including regular and irregular shapes. Among them, the cross-sectional shape of the through slot 17 in its length direction can be a polygon or a circle. When there are multiple through slots 17 on the rotor tooth 12, the shapes of the multiple through slots 17 can be inconsistent. Taking a single through slot 17 as an example, the through slot 17 can be a triangle, a quadrilateral, a pentagon, a hexagon, and so on, and so forth. In this embodiment, the through slot 17 is set as a quadrilateral, and more specifically, a trapezoid, and further an isosceles trapezoid. The through slot 17 with an isosceles trapezoid cross-sectional shape has a better magnetic field adaptation degree with the rotor tooth 12 and the entire rotor 10, that is, the isosceles trapezoid cross-sectional shape has a lower impact on the overall magnetic field of the rotor 10. Therefore, while achieving weight reduction, the impact on the magnetic field strength can be reduced.

[0069] From the perspective of magnetic field strength, setting the through slot 17 as an isosceles trapezoid can match the shape of the rotor tooth 12 and the magnetic field of the surrounding permanent magnet 20, thereby reducing magnetic leakage. Specifically, the length ratio of the upper base to the lower base of the isosceles trapezoid is 1:(1.5 - 2.5), that is, the length of the lower base is 1.5 - 2.5 times that of the upper base, so as to match the shape of the rotor tooth 12. In this embodiment, the length of the upper base of the isosceles trapezoid is 1.8 mm, and the length of its lower base is 3.6 mm. Thus, the waist line of the isosceles trapezoid will be parallel to the side wall 131 of the installation slot 13 formed by the rotor tooth 12, and further match the shape of the rotor tooth 12 to reduce magnetic leakage. Correspondingly, according to the shape design of the rotor tooth 12, the lengths of the upper base and the lower base of the isosceles trapezoid, that is, the length ratio of the upper base to the lower base, can be adjusted according to the specific dimensions of the rotor tooth 12, so as to improve the adaptation degree between the through slot 17 and the rotor tooth 12 and ensure the magnetic flux of the main magnetic field of the rotor 10.

[0070] In addition, referring to the overall shape and relevant dimensions of the rotor tooth 12, the ratio of the distance from the waist line of the isosceles trapezoid to the nearest wall of the installation slot 13 to the length of the upper base of the isosceles trapezoid can be set as 1:(0.7 - 1.2). In the present utility model, the distance from the waist line of the isosceles trapezoid to the nearest wall of the installation slot 13 is equal to the length of the upper base of the isosceles trapezoid. And the ratio of the length of the upper base of the isosceles trapezoid to the distance from the upper base to the magnetic bridge 15 is 1:(5 - 6). In the present utility model, the distance from the upper base of the isosceles trapezoid to the magnetic bridge 15 is 10 mm. And the ratio of the length of the upper base of the isosceles trapezoid to the distance from the lower base to the end of the rotor tooth 12 away from the rotor yoke 11 is 1:(3.5 - 5). In the present utility model, the distance from the lower base of the isosceles trapezoid to the end of the rotor tooth 12 away from the rotor yoke 11 is 8.5 mm. Further, the difference between the length of the lower base of the isosceles trapezoid and its height is not greater than 0.3 mm. In this embodiment, the height of the isosceles trapezoid is 3.5 mm. The above settings minimize magnetic leakage and ensure the magnetic flux of the main magnetic field of the rotor 10.

[0071] Referring to the above, the cross-section of the rotor teeth 12 in the axial direction of the rotor 10 is generally fan-shaped. Thus, the cross-section of the rotor teeth 12 has a symmetry axis, while the cross-section of the through groove 17 is isosceles trapezoidal, that is, the cross-section of the through groove 17 also has a symmetry axis. In the present utility model, the symmetry axis of the cross-section of the rotor teeth 12 coincides with the symmetry axis of the cross-section of the through groove 17, thereby ensuring as much as possible the consistency of the magnetic fields of two adjacent permanent magnets 20 of the rotor teeth 12 and ensuring the overall magnetic flux of the rotor 10.

[0072] Considering the shape settings of the rotor yoke 11 and the rotor teeth 12, and the rotor yoke 11 and the rotor teeth 12 are connected through the magnetic bridge 15, the rotor yoke 11 and the rotor teeth 12 are generally manufactured by an integral molding process. Considering problems such as cost and processing difficulty, the through groove 17 is generally also set uniformly with the integral molding process. However, during the production process of integral molding, the through groove 17 may cause difficulties in demolding due to its shape and length. To reduce the demolding difficulty, from the perspective of the cross-section of the entire rotor 10 in the axial direction, the cross-sectional shape of the through groove 17 is isosceles trapezoidal, and the inner angles of this isosceles trapezoid are all chamfered, thereby greatly reducing the demolding difficulty of the rotor yoke 11 and the rotor teeth 12.

[0073] The present utility model also proposes a drinking water device, which includes the above-mentioned booster pump. The specific structure of the booster pump refers to the above-mentioned embodiments. Since this drinking water device adopts all the technical solutions of the above-mentioned all embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be elaborated here one by one.

[0074] The above is only the 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, comprising a pump head and a motor, the motor being used to drive the pump head, characterized in that, The motor includes a stator, and the stator is provided with plastic coating; a rotor, the rotor is rotatably arranged in the stator, the rotor includes a rotor yoke, a plurality of rotor teeth are evenly spaced on the outer periphery of the rotor yoke, the rotor teeth are connected to the outer peripheral wall of the rotor yoke through magnetic bridges, and an installation groove is formed between two adjacent rotor teeth, and a permanent magnet is arranged in the installation groove; wherein, at least one through groove is formed in the rotor tooth, the length direction of the through groove is parallel to the axial direction of the rotor, the cross-sectional area of the through groove in its length direction is S1, glue injection holes are formed on the side walls of the rotor tooth forming the installation groove, the through groove is located between the connection line of the two glue injection holes in the same rotor tooth and the end of the rotor tooth away from the rotor yoke, a support protrusion is arranged in the installation groove, the support protrusion is arranged on the outer periphery of the rotor yoke, and the support protrusion is used to provide support for the permanent magnet; the support protrusion divides the space between two adjacent magnetic bridges into two weight reduction empty grooves, the cross-sectional area of the weight reduction empty groove in its length direction is S2, and 1.5≤S1 / S2≤4.

2. The booster pump according to claim 1, characterized in that, The support protrusion is arranged along the radial direction of the rotor yoke, and the support protrusion is tapered towards the permanent magnet.

3. The booster pump according to claim 2, characterized in that, The support protrusion has a first end located in the installation groove and supporting the permanent magnet and a second end connected to the rotor yoke, the width of the first end is A1, the width of the second end is A2, and 0.3≤A1 / A2≤0.

5.

4. The booster pump according to claim 3, wherein, The width of the permanent magnet is A3, and 5≤A3 / A1<8.

5. The booster pump according to claim 4, characterized in that, The two side edges of the support protrusion have a first angle α, and 15°≤α≤25°.

6. The booster pump according to claim 5, wherein, A groove is formed between two adjacent magnetic bridges and the rotor yoke, the support protrusion is connected to the bottom of the groove, and the support protrusion divides the groove into two weight reduction empty grooves.

7. The pressure boosting pump according to claim 6, wherein, There is a second angle β between two adjacent magnetic bridges, and 3α / 2≤β≤2α.

8. The booster pump according to any one of claims 1 to 7, characterized in that, One support protrusion corresponding to the permanent magnet is arranged and is located at the center line of the installation groove; or, a plurality of support protrusions corresponding to the permanent magnet are arranged and are symmetrically arranged about the center line of the installation groove.

9. The booster pump according to claim 8, characterized in that, A plurality of the through grooves are arranged in the rotor teeth along the radial direction of the rotor yoke, and the cross-sectional graph of the through groove in its length direction is one of a polygon or a circle.

10. The booster pump according to claim 9, characterized in that, The cross-section of the through groove in its length direction is an isosceles trapezoid, and the length ratio of the upper base to the lower base of the isosceles trapezoid is 1:(1.5 - 2.5).

11. The booster pump according to claim 10, characterized in that, The length of the upper base of the isosceles trapezoid is 1.8 mm, the length of the lower base of the isosceles trapezoid is 3.6 mm, and the difference between the length of the lower base of the isosceles trapezoid and the height of the isosceles trapezoid is not greater than 0.3 mm.

12. The booster pump according to claim 11, wherein, The axis of symmetry of the isosceles trapezoid coincides with the axis of symmetry of the rotor tooth, and the waist line of the isosceles trapezoid is parallel to the plane where the side wall of the adjacent installation groove is located.

13. A drinking water device, characterized in that, Including the booster pump according to any one of claims 1 to 12.

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