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, and the motor comprises a stator; 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, and a mounting groove is formed between every two adjacent rotor teeth; the rotor tooth is provided with at least one through groove, the length direction of the through groove is parallel to the axial direction of the rotor, the side walls, forming the mounting grooves, of the rotor tooth are provided with glue injection holes, and the glue injection holes are located in the middles of the side walls. The through groove is located between the connecting line of the two glue injection holes of the same rotor tooth and the end portion, away from the rotor yoke, of the rotor tooth. According to the technical scheme provided by the utility model, the through grooves are arranged at the specific positions of the rotor teeth, so that the interaction area and efficiency of the magnetic flux in the rotor and the stator are increased, the magnetic flux leakage is reduced, and the efficiency of the motor is improved.

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 motor. However, after the motor is integrated with the booster pump, the overall size of the motor will decrease, which may lead to magnetic leakage of the motor and reduce the motor efficiency. Summary of the Utility Model

[0003] The main object of the utility model is to provide a booster pump and a drinking water device, aiming to ensure the magnetic flux of the motor.

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

[0005] a stator, which is coated;

[0006] a rotor, which is rotatably arranged inside 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. 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, and glue injection holes are formed in the side walls of the rotor tooth forming the installation groove. The glue injection holes are located in the middle of the side walls, and the through groove is located between the connection line of the two glue injection holes on the same rotor tooth and the end of the rotor tooth away from the rotor yoke.

[0008] In an embodiment, a plurality of the through grooves are arranged in the rotor teeth along the radial direction of the rotor yoke, and the cross-sectional shape of the through groove in its length direction is one of a polygon or a circle.

[0009] In an embodiment, the cross-section of the through groove in its length direction is trapezoidal.

[0010] In an embodiment, the cross-section of the through groove in its length direction is isosceles trapezoidal.

[0011] In an embodiment, the ratio of the length of the upper base to the length of the lower base of the isosceles trapezoid is 1:(1.5 - 2.5).

[0012] In an embodiment, the length of the upper base of the isosceles trapezoid is 1.8 mm, and the length of the lower base of the isosceles trapezoid is 3.6 mm.

[0013] In one embodiment, 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.

[0014] In one embodiment, the height of the isosceles trapezoid is 3.5 mm.

[0015] In one embodiment, the rotor teeth and the outer peripheral wall of the rotor yoke are connected by magnetic bridges, and grooves are formed between two adjacent magnetic bridges and the rotor yoke, and support protrusions for supporting the permanent magnets are provided at the bottoms of the grooves.

[0016] In one embodiment, chamfers are provided at the inner angles of the isosceles trapezoid.

[0017] In one embodiment, the axis of symmetry of the isosceles trapezoid coincides with the axis of symmetry of the rotor teeth.

[0018] In one embodiment, the waist line of the isosceles trapezoid is parallel to the plane where the side wall of the adjacent installation groove is located.

[0019] The present utility model also provides a drinking water device, including the above-mentioned booster pump.

[0020] The technical solution of the present utility model increases the interaction area and efficiency of the magnetic flux in the rotor and the stator, reduces the magnetic leakage, and thus improves the efficiency of the motor by providing through grooves at specific positions of the rotor teeth. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on the structures shown in these drawings without creative efforts.

[0022] Figure 1 It is a schematic structural diagram of the booster pump provided by the present utility model;

[0023] Figure 2 It is Figure 1 a schematic structural diagram of the rotor of the motor in

[0024] Figure 3 It is Figure 2 a side view of the rotor from the first perspective in

[0025] Figure 4 It is Figure 2 a side view of the rotor from the second perspective in

[0026] Figure 5 It is a schematic structural diagram of the rotor yoke and the rotor teeth in the present utility model;

[0027] Figure 6 This is a schematic structural view of the rotor yoke and rotor teeth of the present utility model from another perspective;

[0028] Figure 7 This is a magnetic induction intensity diagram of various parts of the rotor of the present utility model.

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

[0030] 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.

[0031] The realization of the purpose, functional features and advantages of the present utility model will be further described with reference to the embodiments and the accompanying drawings. Specific embodiments

[0032] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described with reference to the 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.

[0033] 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.

[0034] 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 where A and B are satisfied simultaneously. In addition, the technical solutions between the embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement it. 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.

[0035] 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.

[0036] 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, a technology has emerged in which the motor 100 is integrated on the pump head 200 of the booster pump, that is, the motor 100 that provides power for the booster pump is integrally arranged 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 bring inconvenience in installation, design and use.

[0037] To solve the above problems, the present utility model proposes a booster pump, which includes a pump head 200 and a motor 100, wherein the motor 100 is used to drive the pump head 200, and the two are integrally arranged with high integration. 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 in the stator; wherein, the rotor 10 includes a rotor yoke 11, and 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, and an installation groove 13 is formed between two adjacent rotor teeth 12. A permanent magnet 20 is arranged in the installation groove 13; thus, when the stator is energized, 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, so that 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 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.

[0038] In addition, glue injection holes 132 are formed in the side walls 131 of the mounting grooves 13 formed by the rotor teeth 12. A support protrusion 14 is provided in the mounting groove 13. The support protrusion 14 is provided on the outer periphery of the rotor yoke 11 and is used to support 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 entire rotor 10 can also be filled 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 is injected from the glue injection holes 132 and continuously fills the mounting groove 13. In the present invention, the weight-reducing empty groove 161 actually belongs to the mounting groove 13, and the support protrusion 14 provides support for the permanent magnet 20 in the mounting groove 13. Therefore, the glue will also fill the weight-reducing empty groove 161 when injecting glue. The rotor teeth 12 and the rotor yoke 11 in the present invention are both made of metal. 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.

[0039] In the present invention, considering the change in 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, so that the cross-sectional area of the through groove 17 will not be too large to cause the reduction of the structural strength of the rotor teeth 12 itself, nor will it be too small due to the opening of the through groove 17, resulting in the rotor teeth 12 being too heavy for the magnetic bridge 15 to support the rotor teeth 12. In addition, the through groove 17 is located between the connection line of the two glue injection holes 132 of the same rotor tooth 12 and the end of the rotor tooth 12 on the rotor yoke 11, that is, the opening position of the through groove 17 is not too close to the rotor yoke 11. Specifically, the cross-section of the rotor tooth 12 in the axial direction of the rotor 10 is similar to a sector. When the permanent magnet 20 is embedded in the mounting groove 13, the rotor 10 itself has a magnetic field. Refer to Figure 7 , the magnetic field intensity at the through groove 17 and the end of the rotor tooth 12 close to the rotor yoke 11 is extremely low. When the opening position of the through groove 17 is too close to the rotor yoke 11, the influence of the end of the rotor tooth 12 and the through groove 17 on the overall magnetic field of the rotor 10 will be superimposed, resulting in the reduction of the overall magnetic field intensity of the rotor 10, thereby causing the reduction of the power of the motor 100.

[0040] 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.

[0041] 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.

[0042] 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, the rotor 10 uses less material, and it is easy to affect the overall structural strength of the rotor 10. Therefore, the magnet filling rate is limited to between 0.45 and 0.65 to increase the magnet filling rate and improve the magnetic properties 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, and 0.58; wherein, in the present embodiment, the magnet filling rate can reach 0.49, so that the motor 100 has better magnetic properties.

[0043] Regarding the supporting convex portion 14, the supporting convex portion 14 is used as one of the positions of the permanent magnet 20 in the mounting groove 13 to ensure the accurate installation of the permanent magnet 20; and through the tapered setting of the supporting convex portion 14, it can not only reduce the weight of the rotor 10, but also help reduce the magnetic leakage of the magnetic flux on the rotor 10 passing through the supporting convex portion 14 to the rotor yoke 11. On the basis of ensuring the assembly of the permanent magnet 20, it can also reduce the stress at the first end 141 of the supporting convex portion 14, that is, when the first end 141 is in direct contact with the radial inner end of the permanent magnet 20, due to the small effective contact area between the supporting convex portion 14 and the permanent magnet 20, the generated stress is also small; of course, in other embodiments, there is a gap between the first end 141 and the radial inner end of the permanent magnet 20, and the first end 141 can be indirectly connected and supported by the injection molding material injected into the gap. At this time, the supporting 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, the gap can be greater than or equal to 0.15 mm and less than or equal to 1 mm.

[0044] Optionally, in the embodiment of the present invention, 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 supporting convex portion 14 and the permanent magnet 20, a low matching 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 it is impossible to ensure the stable operation of the motor 100, and it is also easy to increase the noise; or, the width of the second end 142 is too large, which is likely to increase the occupied space of the supporting convex portion 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, and it is easy to cause a 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; or, the width of the second end 142 is too small, which is likely to affect the connection strength between the supporting convex portion 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 between 0.3 and 0.5 to ensure the stable assembly of the permanent magnet 20. At the same time, it effectively reduces the occupied space of the supporting convex portion 14 in the rotor 10, reduces the weight of the rotor 10, and reduces the magnetic flux leakage, thereby effectively improving the efficiency and performance of the motor 100. The widths A1 and A2 specifically refer to the circumferential widths of the supporting convex portion 14 in the radial cross-section of the rotor 10.

[0045] 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.

[0046] 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 the electrical components with the plastic-encapsulated motor 100, effectively avoiding insulation problems caused by water vapor, water leakage, etc.

[0047] Optionally, in the embodiment of the present utility model, 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 limiting 5 ≤ A3 / A1 < 8, on the basis of ensuring the support of the support protrusion 14 for the permanent magnet 20, the width of the first end 141 can be reduced 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.

[0048] 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 is greater than 8, the width of the first end 141 is too small, resulting in a reduced contact area between the support protrusion 14 and the permanent magnet 20, and the matching strength between the permanent magnet 20 and the rotor 10 is low, increasing the possibility of relative movement between the permanent magnet 20 and the rotor 10, which 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.

[0049] 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.

[0050] Optionally, in the embodiments 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 such a setting, it is convenient to obtain the cross-sectional area of a single permanent magnet 20, and then in combination with 0.45 ≤ Q1 / Q2 ≤ 0.65, the magnet filling rate of the rotor 10 is determined, improving the efficiency and performance of the motor 100.

[0051] In the embodiments of the present invention, the rotor teeth 12 and the outer peripheral wall of the rotor yoke 11 are connected by a magnetic bridge 15. Grooves 16 are formed between two adjacent magnetic bridges 15 and the rotor yoke 11. The support protrusion 14 is connected to the bottom wall of the groove 16, that is, the support protrusion 14 divides the groove 16 into two weight-reducing empty grooves 161. On the one hand, the overall structural strength of the rotor 10 can be improved, and it is also convenient for the assembly of the rotor 10 and the permanent magnet 20. On the other hand, due to the formation of the groove 16, compared with the two magnetic bridges 15 being connected together, it is convenient to improve the magnetic flux leakage of the rotor 10 through the magnetic bridge 15 to the rotor yoke 11, reducing the weight of the rotor 10.

[0052] Among them, in the axial direction of the rotor 10, the thickness of the magnetic bridge 15 can be less than the thickness of the rotor 10, further reducing magnetic flux leakage, thereby effectively improving the efficiency and performance of the motor 100.

[0053] Further, in the embodiments of the present invention, the two side edges of the support protrusion 14 have a first angle α, and the second angle between two adjacent magnetic bridges 15 is β, and 3α / 2 ≤ β ≤ 2α. Among them, the second angle between two adjacent magnetic bridges 15 is equal to the central angle corresponding to the rotor teeth 12, and the first angle is less 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 support protrusion 14. Therefore, the first angle α needs to be less than 36°. Of course, in other embodiments, the first angle changes with the number of magnetic poles to adapt to and support the permanent magnet 20 in the corresponding installation groove 13, and the ratio of the first angle to the second angle can also be changed, which is not limited here.

[0054] Combined with 0.3≤A1 / A2≤0.5, in an embodiment of the present utility model, 15°≤α≤25°, which is convenient for satisfying the tapered design of the support protrusion 14. Specifically, the first angle can be less than or equal to 25°, and the first angle α≥15°, which helps prevent the width of the first end 141 from being too small, affecting the structural stability of the support protrusion 14 at the first end 141, thereby extending the life of the support protrusion 14.

[0055] The specific angles of the first angle α include but are not limited to 15°, 16°, 17°, 18°, 19°, 20°, 21°, 22°, 23°, 24°, and 25°. In this embodiment, α=20°.

[0056] Optionally, in an embodiment of the utility model, the surface of the first end 141 facing the permanent magnet 20 is a curved surface, which can support the contact area between the protrusion 14 and the permanent magnet 20 as much as possible compared to a flat surface, thereby helping to reduce the stress at the first end 141 and, at the same time, ensuring the permanent magnet 20 is firmly installed in the mounting groove 13.

[0057] Optionally, in an embodiment of the present utility model, one supporting protrusion 14 is provided corresponding to the permanent magnet 20 and is located on the center line of the rotor 10 , so as to improve the force uniformity of the permanent magnet 20 and ensure the stable installation of the permanent magnet 20 .

[0058] In another embodiment, while meeting the lightweight requirement of the rotor 10, a plurality of support protrusions 14 are provided corresponding to the permanent magnets 20 and are symmetrically arranged about the center line of the rotor 10 to ensure uniform force on the permanent magnets 20 and improve the connection strength between the permanent magnets 20 and the rotor 10.

[0059] Optionally, in an embodiment of the utility model, a plurality of support protrusions 14 are spaced apart in the axial direction of the rotor 10. This can not only reduce the overall weight of the rotor 10, but also help to isolate the magnetic flux on two adjacent support protrusions 14, reduce magnetic flux leakage, and improve the efficiency and performance of the motor 100.

[0060] Optionally, in an embodiment of the utility model, plastic injection glue is filled between the rotor yoke 11 and the rotor teeth 12. At this time, an injection space for plastic injection glue to flow in is formed between the groove wall of the groove 16 and the outer peripheral surface of the supporting protrusion 14, which facilitates the inflow of plastic injection glue and facilitates improving the connection strength between the rotor 10 and the permanent magnet 20. At the same time, compared with using additional fasteners to fix the rotor 10 as a whole, the setting of plastic injection glue is conducive to reducing the volume of the rotor 10, thereby realizing the miniaturization and lightweight of the motor 100.

[0061] Among them, the injection molding material includes PBT and glass fiber (GF) to have higher heat resistance, better tensile strength and bending strength to adapt to the normal operation of the motor 100 under different working conditions. Further, the injection molding is provided on the outer periphery of the rotor 10, which helps to improve the connection strength between the rotor 10 and the permanent magnet 20.

[0062] Optionally, in the embodiment of the present invention, in the axial direction of the rotor 10, the thickness h1 of the support protrusion 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 protrusion 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, facilitate reducing magnetic field distortion, and improve the operation stability and reliability of the motor 100.

[0063] Among them, the thickness h1 of the support protrusion 14 can be less than or equal to the thickness of the rotor 10.

[0064] 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, in the case of the same magnet filling rate, it is easy to increase the volume of the rotor 10, 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 support protrusion 14 and the thickness h2 of the permanent magnet 20 is limited between 0.8 and 1 to improve the efficiency and performance of the motor 100, and at the same time, improve the operation stability and reliability of the motor 100. In this embodiment, the thickness h1 of the support protrusion 14 can be less than or equal to the thickness of the rotor 10. However, in other embodiments, the thickness of the support protrusion 14 is less than the thickness of the rotor 10, and the recessed thickness of the support protrusion 14 at both ends of the rotor 10 is the same.

[0065] Further, the protruding thickness of the permanent magnet 20 at both ends of the rotor 10 is 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 molding, the protruding permanent magnet 20 is also convenient for increasing the structural strength of the rotor 10.

[0066] In the embodiment of the present utility model, the opening of the through groove 17 also serves to reduce the overall weight of the rotor 10; specifically, multiple through grooves 17 can be provided on the same rotor tooth 12, and the multiple through grooves 17 are arranged radially along the rotor yoke 11 on the rotor tooth 12. In a preferred embodiment of the present utility model, only one through groove 17 is opened on the rotor tooth 12. Combining the above description, considering the overall magnetic flux change 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 overall rotor 10, but also avoid the influence on the magnetic field caused by opening multiple through grooves 17, thereby ensuring the magnetic field strength on the basis of meeting the weight reduction design of the rotor 10.

[0067] The through groove 17 can be designed in various shapes, including regular shapes and irregular shapes. Among them, the cross-sectional pattern of the through groove 17 in its length direction can be a polygon or a circle. When there are multiple through grooves 17 on the rotor tooth 12, the shapes of the multiple through grooves 17 can be inconsistent; taking a single through groove 17 as an example, the through groove 17 can be a triangle, a quadrilateral, a pentagon, a hexagon, and so on, and so on; in this embodiment, the through groove 17 is set as a quadrilateral, and specifically a trapezoid, and further an isosceles trapezoid. The through groove 17 with an isosceles trapezoid cross-sectional shape has a better matching degree with the magnetic field of the rotor tooth 12 and the overall rotor 10, that is, the isosceles trapezoid cross-sectional shape has a lower impact on the overall magnetic field of the rotor 10; thus, while reducing the weight, the influence on the magnetic field strength can be reduced.

[0068] From the perspective of magnetic field strength, setting the through groove 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 upper base length of the isosceles trapezoid is 1.8 mm, and its lower base length is 3.6 mm. Thus, the waist line of the isosceles trapezoid will be parallel to the side wall 131 of the installation groove 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 matching degree between the through groove 17 and the rotor tooth 12 and ensure the magnetic flux of the main magnetic field of the rotor 10.

[0069] 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 groove wall of the installation groove 13 to the length of the upper base of the isosceles trapezoid can be set to 1:(0.7 - 1.2). In the present utility model, the distance from the waist line of the isosceles trapezoid to the nearest groove wall of the installation groove 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 the height of the isosceles trapezoid 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.

[0070] Referring to the above, the cross-section of the rotor tooth 12 in the axial direction of the rotor 10 is generally fan-shaped. Thus, the cross-section of the rotor tooth 12 has a symmetry axis, and the cross-section of the through groove 17 is isosceles trapezoid-shaped, 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 tooth 12 coincides with the symmetry axis of the cross-section of the through groove 17, thereby ensuring the consistency of the magnetic fields of two adjacent permanent magnets 20 of the rotor tooth 12 as much as possible and ensuring the magnetic flux of the whole rotor 10.

[0071] Considering the shape settings of the rotor yoke 11 and the rotor tooth 12, and the rotor yoke 11 and the rotor tooth 12 are connected by the magnetic bridge 15, generally, the rotor yoke 11 and the rotor tooth 12 are manufactured by an integral molding process; considering issues such as cost and processing difficulty, the through groove 17 is generally also set uniformly along with the integral molding process; however, during the production process of integral molding, the through groove 17 may cause difficult demolding due to its shape and length; to reduce the demolding difficulty, from the perspective of the cross-section of the whole rotor 10 in the axial direction, the cross-section shape of the through groove 17 is isosceles trapezoid-shaped, and the inner angles of the isosceles trapezoid are all chamfered, which can greatly reduce the demolding difficulty of the rotor yoke 11 and the rotor tooth 12.

[0072] 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 one by one here.

[0073] 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, 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, 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, glue injection holes are formed in the side walls of the rotor tooth forming the installation groove, the glue injection holes are located in the middle of the side walls, and the through groove is located between the connection line of the two glue injection holes on the same rotor tooth and the end of the rotor tooth far away from the rotor yoke.

2. The booster pump according to claim 1, wherein, A plurality of the through grooves are arranged in the rotor tooth 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.

3. The booster pump according to claim 2, wherein, The cross-section of the through groove in its length direction is trapezoidal.

4. The booster pump according to claim 3, wherein The cross-section of the through groove in its length direction is isosceles trapezoidal.

5. The booster pump according to claim 4, characterized in that, The length ratio of the upper base to the lower base of the isosceles trapezoid is 1:(1.5 - 2.5).

6. The booster pump according to claim 5, characterized in that, The length of the upper base of the isosceles trapezoid is 1.8 mm, and the length of the lower base of the isosceles trapezoid is 3.6 mm.

7. The booster pump according to claim 6, characterized in that, The difference between the length of the lower base of the isosceles trapezoid and the height of the isosceles trapezoid is not more than 0.3 mm.

8. The booster pump according to claim 7, characterized in that, The height of the isosceles trapezoid is 3.5 mm.

9. The booster pump according to any one of claims 5 to 8, characterized in that, The outer peripheral wall of the rotor tooth and the rotor yoke are connected by a magnetic bridge, a groove is formed between two adjacent magnetic bridges and the rotor yoke, and a supporting convex part for supporting the permanent magnet is arranged at the bottom of the groove.

10. The booster pump according to claim 9, characterized in that, The inner angles of the isosceles trapezoid are chamfered.

11. The booster pump according to claim 9, characterized in that, The axis of symmetry of the isosceles trapezoid coincides with the axis of symmetry of the rotor tooth.

12. The booster pump according to claim 9, characterized in that, 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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