Direct-current brushless water pump

Abstract

The utility model provides a direct current brushless water pump which comprises a pump shell, a stator assembly, a rotor assembly and a supporting shaft, a first cavity used for installing the stator assembly and a second cavity used for installing the rotor assembly are arranged in the pump shell, the supporting shaft is fixed with the pump shell, and a main body part of the supporting shaft extends into the second cavity; the rotor assembly comprises a rotor shell, an impeller and a permanent magnet block, the rotor shell is cylindrical, the impeller is connected to the tail end of the rotor shell, and the permanent magnet block is fixed to the outer side wall of the rotor shell; the rotor shell is provided with a shaft hole, when the rotor assembly is installed in the second cavity, the rotor shell is erected in the second cavity through a supporting shaft which is inserted into the shaft hole and is in clearance fit with the shaft hole, and the tail end of the supporting shaft is exposed out of the end face of the tail end of the rotor shell. According to the utility model, the assembly process can be simplified, and incrustation is prevented from accumulating at the shaft hole of the rotor shell to influence rotation of the rotor assembly.

Description

TECHNICAL FIELD

[0001] The utility model relates to water pump field, more specifically, relate to a kind of direct-current brushless water pump. BACKGROUND

[0002] Direct-current brushless water pump is a kind of water pump using direct-current brushless motor drive, with high efficiency, long life and low noise and the like advantages.

[0003] Direct-current brushless water pump includes pump shell, stator assembly, rotor assembly, impeller and rotating shaft etc., wherein stator assembly and rotor assembly are respectively installed in pump shell, rotating shaft is installed together with rotor assembly by bearing or shaft sleeve etc. Due to the existence of bearing or shaft sleeve, the above-mentioned direct-current brushless water pump assembly is relatively cumbersome. And, when the above-mentioned direct-current brushless water pump is applied to hot water container, since rotor assembly and impeller are placed in water for a long time, scale produced in water can enter rotor cavity from the gap between rotor shaft and shaft sleeve, and scale storage increases will cause rotor load increase, and seriously, it can cause rotor to be stuck by scale and cannot rotate. SUMMARY

[0004] The technical problem to be solved by the utility model is that, in view of the problems of cumbersome assembly and easy scale storage of the above-mentioned direct-current brushless water pump, a new direct-current brushless water pump is provided.

[0005] The technical scheme for solving the above-mentioned technical problem is to provide a direct-current brushless water pump, which comprises a pump shell, a stator assembly, a rotor assembly and a support shaft, the pump shell has a first cavity and a second cavity separated therefrom, the stator assembly is installed in the first cavity, the rotor assembly is installed in the second cavity, the support shaft is fixed with the pump shell, and the main body part of the support shaft extends into the second cavity.

[0006] The rotor assembly comprises a rotor shell, an impeller and a permanent magnet block, the rotor shell is in cylindrical shape, the impeller is connected to the tail end of the rotor shell, and the permanent magnet block is fixed to the outer side wall of the rotor shell. The rotor shell has a shaft hole, the shaft hole is penetrated from the end face of the head end to the end face of the tail end, and when the rotor assembly is installed in the second cavity, the rotor shell is erected in the second cavity by the support shaft inserted into the shaft hole and matched with the shaft hole gap, and the tail end of the support shaft is exposed from the end face of the tail end of the rotor shell.

[0007] As a further improvement of the utility model, the pump shell comprises an outer side plate and an inner partition plate, and the inner space of the outer side plate is divided into the first cavity and the second cavity by the inner partition plate. The inner partition plate comprises a cylindrical part and a connecting part, the connecting part is connected to the tail part of the cylindrical part and erects the cylindrical part in the first cavity. The stator assembly is fixed on the outer side wall of the cylindrical part.

[0008] As a further improvement of the utility model, the first end of the cylindrical part has a conical part, the support shaft is fixed on the conical part, and the main body part of the support shaft extends into the cylindrical part from the tail end of the conical part in a coaxial manner.

[0009] As a further improvement of the utility model, the pump shell is made of plastic material, the support shaft and the conical part are injection molded together, and at least a part of the support shaft protrudes out of the front end of the conical part.

[0010] As a further improvement of the utility model, the first cavity includes a first opening on the first end surface of the pump shell, and the stator assembly is arranged into the first cavity through the first opening.

[0011] As a further improvement of the utility model, the direct-current brushless water pump includes a control circuit board, the control circuit board is fixed on the first end of the conical part in a perpendicular manner to the support shaft, and at least a part of the outer periphery of the control circuit board is attached to the inner wall of the outer side plate; the stator assembly includes a coil electrically connected with the control circuit board.

[0012] As a further improvement of the utility model, the second cavity includes a rotor cavity and an impeller cavity, the rotor cavity is formed by the area in the cylindrical part, the impeller cavity is located at the tail end of the rotor cavity and is in communication with the rotor cavity, and when the rotor assembly is assembled into the second cavity, the permanent magnet block is located in the rotor cavity and the impeller is located in the impeller cavity; the pump shell has a water outlet channel in communication with the impeller cavity.

[0013] As a further improvement of the utility model, the tail end of the impeller cavity is formed with a second opening, the rotor assembly is arranged into the second cavity through the second opening; the direct-current brushless water pump includes an impeller cover arranged on the second opening, and the impeller cover has a water inlet channel in communication with the impeller cavity.

[0014] As a further improvement of the utility model, the direct-current brushless water pump includes a filter module, the filter module is arranged at the tail end of the pump shell and covers the impeller cover.

[0015] As a further improvement of the utility model, the impeller is integrated with the rotor shell.

[0016] The utility model has the following beneficial effects: the rotor assembly is erected in the second cavity of the pump shell through the support shaft fixed on the pump shell, the assembly of the rotor assembly can be realized without a shaft sleeve or a bearing, and since the support shaft protrudes out of the end surface of the tail end of the rotor shell, the accumulation of water scale at the shaft hole of the rotor shell can be avoided to affect the rotation of the rotor assembly. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a schematic diagram of a direct-current brushless water pump provided by an embodiment of the present application.

[0018] Figure 2 is a schematic diagram of a cross-sectional structure of a direct-current brushless water pump provided by an embodiment of the present application.

[0019] Figure 3 is Figure 2 a local enlarged schematic diagram of part A. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application will be further described in detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application, and are not used to limit the present application.

[0021] As Figures 1-3 shown, is a schematic diagram of a direct-current brushless water pump provided by an embodiment of the present application. The brushless direct-current water pump can be immersed in water, for example, a hot water container, and realize water pumping. The direct-current brushless water pump of the present embodiment comprises a pump shell 10, a stator assembly 20, a rotor assembly 30 and a support shaft 40, wherein the stator assembly 20, the rotor assembly 30 and the support shaft 40 are respectively arranged in the pump shell 10. The pump shell 10 can be made of hard material, for example, plastic material or metal material, and can form protection for the stator assembly 20, the rotor assembly 30 and the support shaft 40 arranged therein. The stator assembly 20 can generate a direction-changing magnetic field after being energized, and the rotor assembly 30 can rotate under the action of the above direction-changing magnetic field, thereby realizing water pressurized pumping.

[0022] The pump shell 10 has a first cavity 13 and a second cavity, and the first cavity 13 and the second cavity are isolated from each other. The stator assembly 20 is arranged in the first cavity 13, and the rotor assembly 30 is arranged in the second cavity. The support shaft 40 is fixed with the pump shell 10, and the main part of the support shaft 40 extends into the second cavity. Specifically, the external shape and structure of the pump shell 10 can adopt the conventional structure in the art, which will not be described here.

[0023] The rotor assembly 30 comprises a rotor shell 31, an impeller 32 and permanent magnet blocks 33, wherein the rotor shell 31 is cylindrical, the impeller 32 is connected to the tail end of the rotor shell 31, and the permanent magnet blocks 33 are fixed to the outer side wall of the rotor shell 31. The rotor shell 31 and the impeller 32 can be made of hard plastic, and the rotor shell 31 has mounting grooves on the outer side wall. The mounting grooves are distributed along the circumference of the rotor shell 31, and a plurality of permanent magnet blocks 33 are fixed in the mounting grooves along the circumference of the rotor shell 31, and the polarity directions of adjacent permanent magnet blocks 33 are opposite. In particular, to simplify the assembly of the rotor assembly 30, the impeller 32 can be integrated with the rotor shell 31, for example, the impeller 32 and the rotor shell 31 are integrally injection molded. The specific structure and assembly method of the rotor shell 31, the impeller 32 and the permanent magnet blocks 33 can adopt the conventional scheme in the art, and will not be described here.

[0024] The rotor shell 31 has an axle hole, which penetrates from the end face of the head end to the end face of the tail end, and when the rotor assembly 30 is installed in the second cavity of the pump shell 10, the rotor shell 31 is supported in the second cavity by the support shaft 40 inserted into the axle hole and in clearance fit with the axle hole, and the tail end of the support shaft 40 protrudes from the end face 311 of the tail end of the rotor shell 31. In this way, the rotor assembly 30 can rotate relative to the support shaft 40, and as can be understood by those skilled in the art, to ensure smooth rotation of the rotor assembly 30, the clearance between the outer circumferential surface of the support shaft 40 and the inner wall of the axle hole is relatively small. In addition, since there is no shaft sleeve or bearing between the support shaft 40 and the rotor shell 31, the support shaft 40 can be made of graphite material, etc. (or has a layer of graphite material on the outer circumferential surface), and can be lubricated by water entering between the support shaft 40 and the side wall of the axle hole, thereby reducing the resistance when the rotor assembly rotates. As can be understood by those skilled in the art, the structure of the impeller 32 can be designed such that when the impeller 32 is driven to rotate by the rotor shell 31, a thrust force is formed towards the head end of the pump shell 10, avoiding the rotor assembly 30 from being separated from the support shaft 40 when rotating.

[0025] The above-mentioned direct-current brushless motor supports the rotor assembly 30 in the second cavity of the pump shell 10 by the support shaft 40 fixed to the pump shell 10, and the assembly of the rotor assembly 30 can be realized without a shaft sleeve or bearing. Since the tail end of the support shaft 40 protrudes from the end face of the tail end of the rotor shell 31, the axle hole is completely filled with the support shaft, and since the clearance between the support shaft 40 and the axle hole is relatively small, water scale cannot accumulate between the support shaft 40 and the axle hole when the rotor assembly 30 rotates, thereby avoiding the accumulation of water scale in the axle hole of the rotor shell 31 to affect the rotation of the rotor assembly 30.

[0026] In an embodiment of the utility model, the pump shell 10 comprises an outer side plate 11 and an inner partition plate 12, wherein the outer side plate 11 is in a cylindrical shape, and the inner partition plate 12 divides the inner space of the outer side plate 11 into a first cavity 13 and a second cavity. The inner partition plate 12 specifically comprises a cylindrical portion 121 and a connecting portion 122, wherein the connecting portion 122 is connected to the tail end of the cylindrical portion 121 and supports the cylindrical portion 121 in the first cavity 13; the stator assembly 20 is fixed around the outer sidewall of the cylindrical portion 121, i.e. the stator assembly 20 is located between the cylindrical portion 121 and the outer side plate 11, for example, the stator assembly 20 can be sleeved on the cylindrical portion 121 and cannot rotate relative to the cylindrical portion 121. The outer side plate 11 and the inner partition plate 12 can be integrally injection molded, thereby facilitating the manufacturing of the pump shell 10. The specific shape and structure of the outer side plate 11 and the inner partition plate 12 and the connecting structure of the two can adopt the conventional structure in the field, which will not be described here.

[0027] In an embodiment of the utility model, the leading end of the cylindrical portion 121 can have a tapered portion 123, which is integrated with the cylindrical portion 121 and gradually decreases in radial dimension from the end connected to the cylindrical portion 121 to the end away from the cylindrical portion 121, for example, in the axial direction, the tapered portion 123 has multiple steps. The support shaft 40 is fixed on the tapered portion 123, and the main body portion of the support shaft 40 extends into the cylindrical portion 121 in a coaxial manner with the cylindrical portion 121 from the tail end of the tapered portion 123, i.e. the main body portion of the support shaft 40 is supported in the cylindrical portion 121 and located on the center line of the cylindrical portion 121. Through the above structure, the stability of the support shaft 40 can be ensured, and the rotor assembly 30 can rotate smoothly.

[0028] In particular, the pump shell 10 is made of plastic material, the support shaft 40 is injection molded with the tapered portion 123, and at least a portion of the support shaft 40 protrudes out of the front end of the tapered portion 123, thereby further improving the stability of the support shaft 40, and at the same time, reducing the subsequent process of assembling the support shaft 40 to the pump shell 10.

[0029] In an embodiment of the utility model, the first cavity 13 comprises a first opening located on the leading end surface of the pump shell 10, and the stator assembly 20 is installed into the first cavity 13 through the first opening. This structure facilitates the assembly of the stator assembly 20. In addition, after the stator assembly 20 and other devices installed in the first cavity 13 are assembled, a front cover can be added at the first opening.

[0030] In one embodiment of the utility model, the DC brushless water pump further comprises a control circuit board 71, which is fixed to the head end of the conical part 123 of the inner partition plate 12 in a manner perpendicular to the support shaft 40, and the control circuit board 71 can be connected to an external power source through a cable 72; correspondingly, the stator assembly 20 comprises a coil, and the coil is electrically connected to the control circuit board 71. Specifically, at least a part of the outer circumference of the control circuit board 71 can be attached to the inner wall of the outer side plate 11, thereby supporting the conical part 123 and further improving the stability of the DC brushless water pump as a whole. In addition, the control circuit board 71 can have a power supply circuit for supplying power to the coil, and the power supply circuit can generate an alternating magnetic field by adjusting the direction of the current input to the coil, so that the rotor assembly 30 can be driven to rotate in the alternating magnetic field. In particular, to improve the waterproof performance, glue can be injected into the first cavity 13.

[0031] In one embodiment of the utility model, the second cavity comprises a rotor cavity 141 and an impeller cavity 142, wherein the rotor cavity 141 is formed by the area inside the cylindrical part 121, the impeller cavity 142 is located at the tail end of the rotor cavity 141 and is in communication with the rotor cavity 141, and the pump shell 10 has a water outlet passage 16 in communication with the impeller cavity 142. Understandably, in the rotor assembly 30, the outer side edge of the impeller 32 protrudes beyond the outer side edge of the rotor shell 31, and correspondingly, the radial dimension of the impeller cavity 142 is greater than the radial dimension of the rotor cavity 141. When the rotor assembly 30 is assembled into the second cavity, the permanent magnet block 33 is located in the rotor cavity 141, and the impeller 32 is located in the impeller cavity 142. Since the impeller cavity 142 is in communication with the rotor cavity 141, the water in the impeller cavity 142 can enter the rotor cavity 141, and then enter between the support shaft 40 and the shaft hole of the rotor shell 31, and provide lubrication when the rotor shell 31 rotates relative to the support shaft 40, thereby reducing the frictional resistance when the rotor assembly 30 rotates.

[0032] In one embodiment of the utility model, the tail end of the impeller cavity 142 is formed with a second opening 15, and the rotor assembly 30 is assembled into the second cavity through the second opening 15; correspondingly, the DC brushless water pump comprises an impeller cover 50, which is assembled at the second opening 15, and the impeller cover 50 has a water inlet passage in communication with the impeller cavity 142. External water can enter the impeller cavity 142 through the water inlet passage, and be pressurized and sent out from the water outlet passage 16 when the impeller 32 rotates.

[0033] In addition, the DC brushless water pump described above can further comprise a filter module 60, which is assembled at the tail end of the pump shell 10 and covers the outside of the impeller cover 50. In this way, the water entering the water inlet passage of the impeller cover 50 needs to pass through the filter module 60 first and be filtered to remove impurities, thereby avoiding the impurities from entering the impeller cavity 142 and affecting the rotation of the impeller 32. The filter module 60 can comprise filter cotton and other commonly used structures in the field, which will not be described here.

[0034] The above merely describes a preferred embodiment of the present application, but the protection scope of the present application is not limited thereto, any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A direct current brushless water pump characterized by, The pump comprises a pump shell, a stator assembly, a rotor assembly and a support shaft, the pump shell has a first cavity and a second cavity separated by a partition, the stator assembly is arranged in the first cavity, the rotor assembly is arranged in the second cavity, and the support shaft is fixed to the pump shell and has a main body part extending into the second cavity. The rotor assembly comprises a rotor shell, an impeller and a permanent magnet block, the rotor shell is cylindrical, the impeller is connected to the tail end of the rotor shell, and the permanent magnet block is fixed to the outer sidewall of the rotor shell; the rotor shell has a shaft hole extending from the end face of the head end to the end face of the tail end, and when the rotor assembly is arranged in the second cavity, the rotor shell is arranged in the second cavity by the support shaft inserted into the shaft hole and in clearance fit with the shaft hole, and the tail end of the support shaft is exposed from the end face of the tail end of the rotor shell.

2. The brushless DC water pump of claim 1, wherein The pump shell comprises an outer side plate and an inner partition, and the inner partition separates the inner space of the outer side plate to form the first cavity and the second cavity; the inner partition comprises a cylindrical part and a connecting part, the connecting part is connected to the tail end of the cylindrical part and arranges the cylindrical part in the first cavity; and the stator assembly is fixed around the outer sidewall of the cylindrical part.

3. The brushless DC water pump of claim 2, wherein The head end of the cylindrical part has a tapered part, the support shaft is fixed to the tapered part, and the main body part of the support shaft extends into the cylindrical part from the tail end of the tapered part in a coaxial manner.

4. The brushless DC water pump of claim 3, wherein The pump shell is made of plastic material, the support shaft and the tapered part are injection molded together, and at least a part of the support shaft protrudes out of the front end of the tapered part.

5. The brushless DC water pump of claim 3, wherein The first cavity comprises a first opening at the end face of the head end of the pump shell, and the stator assembly is arranged in the first cavity through the first opening.

6. The brushless DC water pump of claim 5, wherein, The direct-current brushless water pump comprises a control circuit board, the control circuit board is fixed to the head end of the tapered part in a perpendicular manner to the support shaft, and at least a part of the outer periphery of the control circuit board is attached to the inner wall of the outer side plate; the stator assembly comprises a coil electrically connected to the control circuit board.

7. The brushless DC water pump of claim 2, wherein The second cavity comprises a rotor cavity and an impeller cavity, the rotor cavity is formed by the area in the cylindrical part, the impeller cavity is located at the tail end of the rotor cavity and communicates with the rotor cavity, and when the rotor assembly is arranged in the second cavity, the permanent magnet block is located in the rotor cavity and the impeller is located in the impeller cavity; the pump shell has a water outlet channel communicating with the impeller cavity.

8. The brushless DC water pump of claim 7, wherein, The tail end of the impeller cavity is formed with a second opening, and the rotor assembly is arranged in the second cavity through the second opening; the direct-current brushless water pump comprises an impeller cover arranged at the second opening, and the impeller cover has a water inlet channel communicating with the impeller cavity.

9. The brushless DC water pump of claim 8, wherein, The direct-current brushless water pump comprises a filter module arranged at the tail end of the pump shell and covering the impeller cover.

10. The brushless DC water pump according to any one of claims 1 to 9, characterized in that The impeller is integrated with the rotor shell.

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