Novel sealing structure of low-voltage direct-current brushless water pump

Abstract

The novel sealing structure of the low-voltage direct-current brushless water pump comprises a bottom shell assembly, a first inner counter bore with an upward opening is formed in the center of the bottom shell assembly, a rotor is further arranged at the position of the first inner counter bore, a rotating shaft penetrates through a center hole of the rotor, and an upper cover is arranged on the upper portion of the bottom shell assembly. The bottom shell assembly is formed by an external bottom shell and an internal stator in an integrated mold-out mode, after the bottom shell and the stator of the water pump form the assembly in an integrated injection molding mode, a bottom cover at the bottom of the bottom shell is omitted, the procedure of injecting glue into a gap of the stator is omitted, and meanwhile, due to the fact that a stator installation frame is omitted, the cost is reduced. And the space for mounting the rotor in the stator can be reduced, and the air gap between the rotor and the stator can be reduced, so that the product cost is saved, the performance of the water pump motor is improved, and the aim of saving energy is fulfilled.

Description

Technical Field

[0001] The utility model relates to the field of water pumps, in particular to the field of low-voltage DC brushless water pumps. Background Technique

[0002] In the conventional structure of a low-voltage DC brushless water pump, the bottom of the bottom shell is open, and a stator mounting frame is arranged on the upper part of the bottom shell. After the stator inside is installed in the bottom shell, an expensive sealant is poured into the bottom shell, and then a bottom cover is added to the bottom of the bottom shell to complete the assembly and sealing of the stator and the bottom shell. According to this structural method, due to the stator mounting frame, the aperture of the center of the stator will be larger. Synchronously, the diameter of the rotor installed in the center hole of the stator also needs to be increased synchronously, and the gap between the rotor and the stator will also be larger. This will result in not only more production and processing procedures for the product, but also an increase in cost. At the same time, due to the larger air gap between the rotor and the stator, the magnetic induction rotation efficiency of the motor will decrease, increasing the energy consumption of the water pump. Content of the Utility Model

[0003] In order to solve the above problems, the utility model provides a new sealing structure for a low-voltage DC brushless water pump, which includes a bottom shell assembly. A first inner sunken hole with an upward opening is arranged in the center of the bottom shell assembly. A rotor is also arranged in the first inner sunken hole. A rotating shaft penetrates through the center hole of the rotor. An upper cover is arranged on the upper part of the bottom shell assembly. The bottom shell assembly is formed by integrally molding the external bottom shell and the internal stator.

[0004] Further, a convex platform is arranged at the bottom of the first inner sunken hole. A first shaft mounting sunken hole with an upward opening is arranged in the center of the convex platform. The first inner sunken hole and the first shaft mounting sunken hole are concentric. The first inner sunken hole in the convex platform is used to fix the rotating shaft.

[0005] Preferably, the unilateral air gap between the first inner sunken hole and the outer diameter of the lower part of the rotor is 0.5 - 1.2 mm. When the bottom shell and the internal stator are integrally molded, the original mounting frame for fixing the stator can be omitted, so that the inner aperture of the stator can be reduced, and thus the cost of the stator can be reduced. When the inner aperture of the stator is reduced, the air gap between the rotor and the stator can be effectively reduced. When the air gap is reduced, the electromagnetic induction efficiency of the motor will be improved, effectively achieving the effect of energy saving.

[0006] Further, a second inner sunken hole with a downward opening is arranged at the center of the bottom of the rotor. The diameter and height of the second inner sunken hole are both larger than the diameter and height of the convex platform. When the rotor rotates, the second inner sunken hole rotates around the periphery of the convex platform without interference.

[0007] Further, at least two or more positioning holes are evenly distributed on the outer end face of the stator centered on the center of the circle. The positioning holes correspond to the positioning pins on the bottom housing mold, which is conducive to corresponding positioning of the positions of the stator and the bottom housing.

[0008] Further, a second shaft mounting counterbore is provided at the center of the inner cavity of the upper cover. The upper end of the rotating shaft is mounted in the second shaft mounting counterbore, and the lower end of the rotating shaft is mounted in the first shaft mounting counterbore on the convex platform.

[0009] Preferably, the material of the housing in the bottom shell assembly is BMC plastic. Using BMC plastic as the material is conducive to injection filling of the gap after the bottom housing and the stator are combined, eliminating the process of pouring glue between them.

[0010] The working principle of the present utility model is as follows: When the bottom housing of the water pump and the stator form an assembly by integral injection molding, the bottom cover of the bottom housing is saved, and the process of injecting glue into the gap of the stator is also saved. At the same time, because the original stator mounting frame is removed, the space for installing the rotor in the stator can also be reduced. Also, because the wall thickness of the integral injection molding can be appropriately reduced, the air gap between the rotor and the stator can also be reduced, thus saving product costs, improving the performance of the water pump motor, and achieving the purpose of energy saving. Description of the Drawings

[0011] The present utility model will be further described in detail below in conjunction with the drawings and the embodiments of the present utility model.

[0012] Figure 1 An exploded schematic diagram of the present utility model is shown.

[0013] Figure 2 A schematic diagram of the assembled finished product of the present utility model is shown.

[0014] Figure 3 A sectional view of the assembled present utility model is shown. Detailed Embodiments

[0015] As Figures 1 - 3 shown, the present utility model will be further described in detail by way of embodiments:

[0016] The utility model discloses a novel sealing structure of a low-voltage direct current brushless water pump. In the present embodiment, the utility model comprises a bottom shell component 1. The center of the bottom shell component 1 is provided with a first inner countersunk hole 112 which is open upwards. A rotor 5 is further provided at the first inner countersunk hole 112. A rotating shaft 3 is passed through the central hole of the rotor 5. An upper cover 4 is provided at the upper part of the bottom shell component. A water inlet and a water outlet are provided in the upper cover 4. The bottom shell component 1 is formed by an outer bottom shell 11 and an inner stator 12 being molded in one piece. The bottom shell 11 is made of BMC plastic. When the bottom shell 11 is injection molded with BMC plastic, the stator 12 is placed in the mold for one-piece mold molding. This saves the bottom of the bottom shell 11 from being sealed with the bottom cover, and also eliminates the bottom installation process. The bottom shell 11 is made of BMC plastic, which is conducive to injection filling of the gap after the bottom shell 11 and the stator 12 are combined, and eliminates the process of pouring glue therebetween.

[0017] In this embodiment, a boss 113 is provided at the bottom of the first inner countersunk hole 112, and the boss 113 is circular. A first shaft mounting countersunk hole with an upper opening is provided at the center of the boss 113. The first inner countersunk hole 112 and the first shaft mounting countersunk hole have the same center, and the first shaft mounting countersunk hole in the boss 113 is used to fix the rotating shaft 3.

[0018] Preferably, the single-sided air gap between the first inner countersunk hole 112 and the outer diameter of the lower part of the rotor 5 is 0.5-1.2 mm. When the bottom shell 11 and the internal stator 12 are injection molded in an integral mold, the mounting frame used to fix the stator in the prior art can be eliminated, so that the inner aperture of the stator 12 can be reduced, and thus the cost of the stator 12 can be reduced. When the inner aperture of the stator 12 is reduced, the air gap between the rotor 5 and the stator 12 can be effectively reduced. When the air gap is reduced, the electromagnetic induction efficiency of the motor will be improved, which can effectively achieve the effect of energy saving.

[0019] In this embodiment, a second inner countersunk hole 51 with an opening at the bottom is provided at the bottom center of the rotor 5. The diameter and height of the second inner countersunk hole 51 are greater than the diameter and height of the boss 113. When the rotor 5 rotates, the second inner countersunk hole 51 rotates around the periphery of the boss without interfering with the rotor 5.

[0020] In this embodiment, at least two positioning holes 121 are evenly distributed on the outer end surface of the stator 12 with the center of the circle as the center. The positioning holes 121 correspond to the positioning pins on the mold of the bottom shell 11, which is conducive to corresponding positioning of the stator 12 and the bottom shell 11.

[0021] In this embodiment, a second shaft mounting countersunk hole 41 is provided at the center of the inner cavity of the upper cover 4 , the upper end of the rotating shaft 3 is mounted in the second shaft mounting countersunk hole 41 , and the lower end of the rotating shaft 3 is mounted in the first shaft mounting countersunk hole on the boss 113 .

[0022] In this embodiment, a through hole is provided in the upper fixing frame 401 of the upper cover 4, and is connected and fixed to the counterbore provided in the lower fixing frame 111 of the bottom housing 11 by means of a screw structure, so as to lock the upper cover 4 and the bottom housing assembly 1.

[0023] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0024] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying 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 of such features. In the description, "a plurality of" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0025] In the present invention, unless otherwise clearly specified and defined, the terms "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection, an electrical connection or communication with each other; it may be directly connected, or indirectly connected through an intermediate medium, and may be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly defined.

[0026] For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as a limitation of the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention. Any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A new sealing structure for a low-voltage DC brushless water pump, characterized in that: It includes a bottom shell assembly, a first inner countersunk hole opening upward is arranged at the center of the bottom shell assembly, a rotor is also arranged at the first inner countersunk hole, a rotating shaft passes through the center hole of the rotor, an upper cover is arranged on the upper part of the bottom shell assembly, and the bottom shell assembly is formed by integrally molding an outer bottom shell body and an inner stator.

2. A novel sealing structure for a low-voltage DC brushless water pump according to claim 1, characterized in that: A boss is disposed at the bottom of the first inner countersunk hole, a first shaft mounting countersunk hole with an upper opening is disposed at the center of the boss, and the first inner countersunk hole and the first shaft mounting countersunk hole have the same center.

3. A new sealing structure for a low-voltage DC brushless water pump according to claim 2, characterized in that: The single-sided air gap between the first inner countersunk hole and the lower part of the rotor is 0.5-1.2 mm.

4. A new sealing structure for a low-voltage DC brushless water pump according to claim 3, characterized in that: A second inner countersunk hole with an opening at the bottom is arranged at the center of the bottom of the rotor, and the diameter and height of the second inner countersunk hole are both greater than the diameter and height of the boss.

5. The novel sealing structure of a low-voltage DC brushless water pump according to claim 1 is characterized in that: The outer end surface of the stator is evenly distributed with at least two positioning holes centered on the center of the circle.

6. The novel sealing structure of a low-voltage DC brushless water pump according to claim 1 is characterized in that: A second shaft mounting countersunk hole is arranged at the center of the inner cavity of the upper cover, the upper end of the rotating shaft is mounted in the second shaft mounting countersunk hole, and the lower end of the rotating shaft is mounted in the first shaft mounting countersunk hole on the boss.

7. The novel sealing structure of a low-voltage DC brushless water pump according to claim 1 is characterized in that: The material of the bottom shell in the bottom shell assembly is BMC plastic.

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