Waterproof motor

Abstract

The application provides a waterproof motor, which can avoid the problem of burning of a circuit board after the motor is immersed in water and effectively improves the waterproof performance of the waterproof motor. Specifically, the waterproof motor provided by the application comprises a stator arranged on a motor shell, a rotor arranged in the motor shell, a rotating shaft connected with the rotor and extending out of the motor shell, and a circuit board arranged in the motor shell, wherein an inner end cover which surrounds the rotating shaft and extends along the radial direction of the rotating shaft is further arranged between the rotor and the circuit board in the motor shell.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric machines, in particular to a waterproof electric machine. BACKGROUND

[0002] Different application scenarios have different requirements for the waterproof performance of electric machines. The electric appliance industry has promulgated standards for classifying electric appliances according to their dust and moisture resistance, referred to as IP protection levels. The IP protection level is composed of two numbers, the first number represents the level of dust and foreign matter prevention of the electric appliance, and the second number represents the degree of moisture and water immersion prevention of the electric appliance, and the larger the number, the higher the protection level. Different IP protection levels correspond to different waterproof performance. For example, IPX3-IPX6 levels correspond to water spray test, water splash test, low pressure water spray test, and large water spray test, respectively, while IPX7 and IPX8 levels correspond to water immersion and diving tests, respectively.

[0003] In order to improve the waterproof performance of the electric machine, the common waterproof method of the electric machine at least includes covering the electric machine with a special shell or adding a waterproof shaft seal system to protect the moving parts of the electric machine. However, the cost of the special shell is high, and the waterproof performance of the waterproof shaft seal system, such as adding waterproof rubber to the shaft extension part and applying sealing glue to the water penetration part, is not obvious, and the waterproof level of the electric machine can be improved to IPX4 or IPX5 level at most, and the electric machine will still be damaged once it is immersed in water. SUMMARY

[0004] In view of the above problems of the prior art, the present application provides a waterproof electric machine, which can keep the electric machine running even if it is immersed in water, and improve the waterproof level of the electric machine to the level of preventing water immersion.

[0005] The inventor has found through extensive research that the main reason for the damage of the electric machine after immersion in water is the damage caused by the water entering the circuit board. In order to solve the problem of damage to the electric machine caused by the burning of the circuit board after water entering, the present application provides a waterproof electric machine which can avoid the problem of burning of the circuit board after the electric machine is immersed in water. Specifically, the waterproof electric machine provided by the present application comprises a stator arranged on an electric machine housing, a rotor arranged in the electric machine housing, a rotating shaft connected to the rotor and extending out of the electric machine housing, and a circuit board arranged in the electric machine housing, wherein an inner end cover is arranged in the electric machine housing between the rotor and the circuit board, and the inner end cover surrounds the rotating shaft and extends in the radial direction of the rotating shaft.

[0006] Because the inner end cover is further arranged between the rotor and the circuit board, the inner end cover can form a sealed chamber for the circuit board together with the motor housing of the waterproof motor, so as to isolate the circuit board from the space where the rotor is located. In this way, even if the motor is immersed in water, the circuit board can be kept in the chamber independent of the water immersion environment and will not be burned due to water immersion. In addition, because the inner end cover surrounds the rotating shaft and extends along the radial direction of the rotating shaft, the inner end cover and the rotating shaft can be relatively sealed while allowing relative rotation during rotation of the rotating shaft. Test results show that the waterproof performance of the waterproof motor can be effectively improved by the above technical solution, for example, the waterproof level of some waterproof motors adopting the above technical solution can be improved to IPX7 level.

[0007] In some preferred technical solutions of the present application, the edge portion of the inner end cover away from the rotating shaft is closely attached to the motor housing. Because the edge portion is closely attached to the housing, a more effective waterproof sealing structure can be formed between the inner end cover and the motor housing to further ensure the waterproof performance of the chamber 61 where the circuit board is located.

[0008] In some preferred technical solutions of the present application, the inner end cover abuts one end of the rotating shaft. According to this technical solution, the inner end cover can provide support for the rotating shaft and improve the stability of the rotating shaft by abutting the rotating shaft.

[0009] In some preferred technical solutions of the present application, a first surrounding portion surrounding the rotating shaft is arranged on the surface of the inner end cover facing the rotor. According to the above technical solution, the first surrounding portion can increase the contact area between the inner end cover and the rotor. In some technical solutions, a bearing can be additionally arranged between the first surrounding portion and the rotor. In this technical solution, the first surrounding portion can also serve as support and limiting for the bearing, thereby increasing the stability of the bearing.

[0010] In some preferred technical solutions of the present application, a second surrounding portion surrounding the first surrounding portion is arranged on the surface of the inner end cover facing the rotor, and the second surrounding portion is closely attached to the motor housing. The second surrounding portion can further increase the contact area between the inner end cover and the motor housing, thereby improving the sealing effect between the inner end cover and the motor housing.

[0011] In some preferred technical solutions of the present application, the inner end cover is arranged in the form that the rotating shaft penetrates the inner end cover. According to this technical solution, the length of the rotating shaft can be further extended, and the longer rotating shaft can be more easily and stably supported.

[0012] In some preferred technical solutions of the present application, the inner end cover further comprises a sleeve portion, and the sleeve portion is formed by extending from the side of the inner end cover away from the rotor along the rotating shaft. The sleeve portion extending along the rotating shaft can form a more stable support for the rotating shaft, and in addition, the inner end cover integrally formed with the sleeve portion can reduce the number of parts and facilitate assembly.

[0013] In some preferred embodiments of the present invention, the waterproof motor further includes a sealing ring disposed between the sleeve portion and the motor housing. The sealing ring between the sleeve portion and the motor housing prevents water from flowing into the cavity containing the circuit board through the gap between the sleeve portion and the motor housing, ensuring that the circuit board is isolated from water.

[0014] In some preferred embodiments of the present invention, the waterproof motor further includes a shaft sleeve, which is fitted onto the rotating shaft in a manner close to the inner end cap and disposed on one side of the circuit board.

[0015] In some preferred embodiments of the present invention, the waterproof motor further includes a first sealing ring for the shaft sleeve, disposed between the shaft sleeve and the inner end cover. The first sealing ring for the shaft sleeve can prevent water from flowing into the cavity where the circuit board is located through the gap between the shaft sleeve and the inner end cover, ensuring that the circuit board is isolated from water.

[0016] In some preferred embodiments of the present invention, the waterproof motor further includes a second sealing ring for the shaft sleeve, disposed between the shaft sleeve and the motor housing. The first sealing ring for the shaft sleeve prevents water from flowing into the cavity containing the circuit board through the gap between the shaft sleeve and the motor housing, ensuring that the circuit board is isolated from water.

[0017] In some preferred embodiments of the present invention, a Hall element is provided on the circuit board, and the inner end cover is made of a non-ferromagnetic material. The inner end cover made of a non-ferromagnetic material has virtually no impact on the magnetic field distribution around the rotor, thereby enabling the Hall element on the circuit board to accurately detect the magnetic field distribution around the rotor and control the operation of the waterproof motor based on the detected magnetic field distribution. Attached Figure Description

[0018] Figure 1 This is a cross-sectional view of the waterproof motor in the first embodiment of the present invention;

[0019] Figure 2 for Figure 1 A schematic diagram of the inner end cap in the embodiment;

[0020] Figure 3 This is a cross-sectional view of the waterproof motor in the second embodiment of the present invention;

[0021] Figure 4 for Figure 3 A schematic diagram of the inner end cap in the embodiment;

[0022] Figure 5 This is a cross-sectional view of the waterproof motor in the third embodiment of the present invention;

[0023] Figure 6 for Figure 5 A schematic diagram of the inner end cap in the embodiment. Detailed Implementation

[0024] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort belong to the scope of protection of the present application.

[0025] In the description of the present application, it should be understood that the terms "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0026] In addition, the terms "first", "second", "third" and the like are used only for descriptive purposes and should not be construed as indicating or implying relative importance or a specific number of the technical features indicated. Therefore, the features defined as "first", "second" and the like can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified and limited.

[0027] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, or the communication between two elements. For those of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0028] In the present application, unless otherwise explicitly specified and limited, the first feature "above" or "below" the second feature can include the first and second features directly contacting, or the first and second features not directly contacting but contacting through another feature between them. Moreover, the first feature "above", "above" and "above" the second feature includes the first feature directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature includes the first feature directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0029] In addition, it should be noted that the term "extending radially" and similar terms should be interpreted broadly and do not necessarily mean a strict mathematical radial direction. For example, the term "extending radially" is intended to define a direction that is substantially radial.

[0030] [First embodiment]

[0031] As described in the background, the existing waterproof measures are difficult to effectively improve the waterproof performance of the waterproof motor 1, especially it is difficult to improve the waterproof level to the degree of anti-immersion by simple device structure. The inventor found through a large number of in-depth research that the main reason for the damage of the motor after immersion is the damage caused by the water entering the circuit board 6. In order to solve the problem of motor damage caused by burning after the water entering the circuit board 6, the present embodiment provides a waterproof motor 1 which can avoid the problem of burning of the circuit board 6 after the motor is immersed.

[0032] Specifically, referring to Figure 1 The present embodiment provides a waterproof motor 1, which comprises a stator 3 arranged on a motor housing 2, a rotor 4 arranged in the motor housing 2, a rotating shaft 5 connected with the rotor 4 and extending out of the motor housing 2, and a circuit board 6 arranged in the motor housing 2. In the motor housing 2, especially between the rotor 4 and the circuit board 6, an inner end cover 71 is arranged. The inner end cover 71 surrounds the rotating shaft 5 and extends along the radial direction of the rotating shaft 5.

[0033] Because of the existence of the inner end cover 71, it can form a chamber 61 sealing the circuit board 6 together with the motor housing 2 of the waterproof motor 1. The chamber 61 is isolated from the space where the rotor 4 is located. Even if the motor is immersed in water, for example, the space where the rotor 4 is located is filled with water, the circuit board 6 is still kept in the chamber 61 which is independent of the space where the rotor 4 is located, and will not be burned due to immersion.

[0034] In addition, because the inner end cover 71 surrounds the rotating shaft 5 and extends along the radial direction of the rotating shaft 5, during the rotation of the rotating shaft 5, the inner end cover 71 and the rotating shaft 5 can be relatively sealed while allowing relative rotation. Test results show that the waterproof performance of the waterproof motor 1 provided by the present embodiment is effectively improved, for example, it can be improved to IPX7 level.

[0035] The motor housing 2 at least comprises a plastic package 2b and an outer end cover 2a arranged at the end of the plastic package 2b. The plastic package 2b is in a cylindrical structure, and the space in the central hollow part is used to accommodate the rotor 4 and the circuit board 6. The outer end cover 2a and the circuit board 6 are arranged on the same side of the rotor 4.

[0036] In the prior art, the space where the rotor 4 is located and the space where the circuit board 6 is located are in communication with each other, and once the rotor 4 is immersed in water, the circuit board 6 will also be soaked and burned. In the embodiment, the outer end cover 2a, the plastic sealing member 2b and the inner end cover 71 jointly enclose a chamber 61 for placing the circuit board 6, which has high waterproof performance, and the chamber 61 is independent of the space of the rotor 4. The above-mentioned method of adding a simple inner end cover 71 can effectively improve the waterproof performance of the waterproof motor 1, and the cost is low but the benefit of high waterproof performance can be obtained.

[0037] In the embodiment, as a preferred, the inner end cover 71 has an edge portion 71c away from the rotating shaft 5, which is tightly attached to the motor housing 2. Specifically, the edge portion 71c is the outermost edge portion of the inner end cover 71 in the radial direction, which is in abutment with the plastic sealing member 2b of the motor housing 2 and is tightly attached to the plastic sealing member 2b. The degree of tight attachment is sufficient to prevent water at the immersion level from entering from one side to the other side, thereby ensuring the waterproof performance of the chamber 61. In the above manner, the inner end cover 71 and the motor housing 2 can form a more effective waterproof sealing structure, and the chamber 61 with high waterproof performance is further provided for the circuit board 6 and other components related to the core of the waterproof performance in the waterproof motor 1, thereby improving the overall waterproof performance of the waterproof motor 1.

[0038] In the embodiment, the center of the inner end cover 71 is a non-porous structure. Specifically, the bottom (lower side surface) of the integrally formed inner end cover 71 is a complete plane, and the center of the inner end cover 71 is in abutment with the lower end of the rotating shaft 5, thereby forming axial support for the rotating shaft 5 and improving the stability of the rotating shaft 5. Figure 1

[0039] As a preferred, the inner end cover 71 in the embodiment is provided with a first surrounding portion 71a surrounding the rotating shaft 5 on the surface facing the rotor 4. Figure 1 Figure 2 The first surrounding portion 71a can surround the rotating shaft 5 in abutment with each other, or can surround the rotating shaft 5 with a spacing therebetween, as long as it can prevent water at the position of the rotating shaft 5 from flowing into the chamber 61 of the circuit board 6.

[0040] In the embodiment, the rotor 4 has a recessed portion 4a at the bottom center, and the first surrounding portion 71a is tightly attached to the inner wall of the recessed portion 4a. The degree of tight attachment is sufficient to prevent water at the immersion level (IPX7 waterproof level) from entering from one side to the other side. Because the first surrounding portion 71a extends in the axial direction, it has a large contact area with the inner wall of the recessed portion 4a, thereby effectively improving the waterproof performance.

[0041] ​​In addition, because the first surrounding portion 71a is attached to the inner wall of the recessed portion 4a in the embodiment, rather than being directly attached to the rotating shaft 5, there is a space between the first surrounding portion 71a and the rotating shaft 5 for installing the bearing 11. The two side surfaces of the first surrounding portion 71a are tightly attached to the inner wall of the recessed portion 4a and the outer wall of the bearing 11 respectively, which on the one hand can increase the contact area with the two sides and improve the waterproof performance, and on the other hand can provide support for the bearing 11 and limit the position of the bearing 11 in the axial and radial directions, thereby increasing the stability of the bearing 11.

[0042] The inner end cover 71 also has a second surrounding portion 71b outside the first surrounding portion 71a, which is also located on the surface of the inner end cover 71 facing the rotor 4 and surrounds the first surrounding portion 71a. The two sides of the second surrounding portion 71b are tightly attached to the outer edge of the rotor 4 and the inner edge of the plastic sealing member 2b respectively, thereby completing the waterproof sealing between the plastic sealing member 2b and the outer edge of the rotor 4. Because the second surrounding portion 71b also extends in the axial direction, similar to the first surrounding portion 71a, this structure can increase the contact area with the two side components (the plastic sealing member 2b and the rotor 4) and improve the waterproof performance.

[0043] In the embodiment, the first surrounding portion 71a and the second surrounding portion 71b are both circular rings, but in other embodiments of the application, the shapes of the first surrounding portion 71a and the second surrounding portion 71b can be adjusted as needed and are not limited to circular rings.

[0044] In the above manner, the waterproof motor 1 provided by the embodiment provides a chamber 61 separated from the rotor 4 for the circuit board 6 by arranging the inner end cover 71 between the circuit board 6 and the rotor 4, so that even if the motor is immersed in water, the circuit board 6 can be kept in the chamber 61 independent of the water immersion environment and will not be burned due to the motor being immersed in water. In addition, because the inner end cover 71 surrounds the rotating shaft 5 and extends in the radial direction of the rotating shaft 5, the inner end cover 71 and the rotating shaft 5 can be relatively sealed while allowing relative rotation during rotation of the rotating shaft 5. Test results show that by using the above technical solutions, the waterproof performance of the waterproof motor 1 can be effectively improved, for example, to the extent of being resistant to water immersion.

[0045]

Embodiment 2

[0046] Figure 3 is a sectional view of the waterproof motor 1 in the second embodiment of the application.

[0047] In the present embodiment, the main structure of the waterproof motor 1 includes a motor housing 2, a stator 3, a rotor 4, a rotating shaft 5, a circuit board 6, and an inner end cover 72. Except that the structure of the inner end cover 72 is different from that of the inner end cover 71 in the first embodiment, and the rotating shaft 5 extends out of the motor housing 2 from both sides, the other components and reference numerals are the same as those in the first embodiment, which will not be described here again. Figure 1

[0048] As shown in Figure 3 , the inner end cover 72 in the present embodiment is centrally provided with a through hole penetrating the inner end cover 72 in the axial direction, and the rotating shaft 5 penetrates the inner end cover 72 from one side of the inner end cover 72 and extends out from the other side. Further, the rotating shaft 5 also extends out from the upper and lower sides of the motor housing 2, respectively, and the upper and lower sides of the rotating shaft 5 can also be respectively provided with blades to form a fan structure suitable for, for example, a duct type indoor unit. Accordingly, the waterproof motor 1 extending out of the motor housing 2 from one side can be applied to the fan structure of a wall-mounted air conditioner. Of course, the above-mentioned structure of installing blades is only an example, and the waterproof motor 1 provided in the present embodiment can also be used in any other suitable application scenario.

[0049] Referring to Figure 3 and Figure 4 , the inner end cover 72 is also integrally formed with a sleeve portion 72a extending from the side of the inner end cover 72 away from the rotor 4 in the axial direction of the rotating shaft 5. Specifically, the sleeve portion 72a is annular, and the inner wall thereof is slidably connected with the rotating shaft 5 to support the rotating shaft 5 and inhibit the radial movement of the rotating shaft 5.

[0050] In this way, the length of the rotating shaft 5 is extended, and by installing a bearing or the sleeve portion 72a on the extended portion, the span of the bearing or the sleeve portion 72a and other support components in the axial direction can be increased, and the stability of the rotating shaft 5 can be improved. Because the inner end cover 72 is an integrally formed structure, the number of parts during assembly is small, and the assembly is more convenient. Moreover, as long as the manufacturing precision of the inner end cover 72 can be guaranteed, as long as the sleeve portion 72a is sleeved around the rotating shaft 5 and tightly fits with the rotating shaft 5 during assembly, the edge portion 72c of the inner end cover 72 can also tightly fit with the motor housing 2 to achieve sealing.

[0051] In order to further improve the sealing performance of the chamber 61, the waterproof motor 1 of the present embodiment is also provided with a sealing ring 8 between the sleeve portion 72a and the outer end cover 2a of the motor housing 2. The sealing ring 8 can prevent water from flowing into the sealed chamber 61 where the circuit board 6 is located through the gap between the sleeve portion 72a and the outer end cover 2a, and ensure that the circuit board 6 is isolated from water.

[0052] ​It should be noted that although the waterproof motor 1 provided in the present embodiment is a double-shaft motor, i.e., the rotating shaft 5 of the waterproof motor 1 extends from both sides of the waterproof motor 1, it can be understood by those skilled in the art that the present embodiment is only an example, and in other embodiments, the rotating shaft 5 of the waterproof motor 1 can also extend from one side of the waterproof motor 1, thereby forming a single-shaft motor, and other components or structures only need to be adjusted adaptively, and the technical solutions obtained by the above adaptive adjustment do not exceed the protection scope of the present application without departing from the main idea of the present application.

[0053] Embodiment 3

[0054] Figure 5 is a sectional view of the waterproof motor 1 in the third embodiment of the present application.

[0055] As shown in Figure 5 , compared with the first embodiment, in the main structure of the waterproof motor 1, in addition to the further provision of the shaft sleeve 9 in the present embodiment, other components and reference numerals in the present embodiment are the same as those in the first embodiment shown in Figure 1 , which will not be described here again.

[0056] Specifically, the shaft sleeve 9 is arranged on the side of the inner end cover 73 close to the circuit board 6, and the shaft sleeve 9 is arranged immediately adjacent to the inner end cover 73. The shaft sleeve 9 extends along the axial direction of the rotating shaft 5 and is formed in a circular ring shape. The inner wall of the circular ring-shaped shaft sleeve 9 is in sliding connection with the rotating shaft 5, and the rotating shaft 5 can rotate in the interior of the shaft sleeve 9 and can be supported by the shaft sleeve 9. Similarly to the sleeve portion 72a in the second embodiment, the shaft sleeve 9 can form a more stable support for the rotating shaft 5. The circuit board 6 is also arranged in a ring structure.

[0057] Referring to Figure 5 and Figure 6 , in the present embodiment, through holes are arranged in the center of the inner end cover 73 and the shaft sleeve 9. The rotating shaft 5 passes through the center of the shaft sleeve 9, and the shaft sleeve 9 passes through the center of the circuit board 6. The three are sequentially sleeved from the center to the periphery, thereby ensuring the balance of the overall weight of the motor.

[0058] In addition, in order to further guarantee the waterproof performance of the cavity 61, the shaft sleeve first sealing ring 10a is arranged between the shaft sleeve 9 and the inner end cover 73. The shaft sleeve second sealing ring 10b is also arranged between the shaft sleeve 9 and the motor housing 2 (specifically between the shaft sleeve 9 and the outer end cover 2a). The shaft sleeve first sealing ring 10a can prevent water from flowing into the cavity 61 where the circuit board 6 is located through the gap between the shaft sleeve 9 and the inner end cover 73, and the shaft sleeve second sealing ring 10b can prevent water from flowing into the cavity 61 where the circuit board 6 is located through the gap between the shaft sleeve 9 and the outer end cover 2a, thereby plugging the gap at the upper and lower ends of the shaft sleeve 9, respectively, and ensuring that the circuit board 6 is isolated from water.

[0059] Similar to the second embodiment, in the present embodiment, the inner end cover 73 is centrally provided with a through hole, the rotating shaft 5 passes through the inner end cover 73, and extends out from both sides of the motor housing 2. Of course, in some other embodiments, the rotating shaft 5 can also extend out from a single side of the motor housing 2.

[0060] In the above embodiments 1-3, the circuit board 6 can be provided with a Hall element (not shown) for detecting the magnetic field distribution of the rotor 4, and controlling the operation of the waterproof motor 1 according to the detection result. Because the embodiments of the present application are provided with the inner end covers 71, 72, 73 between the rotor 4 and the circuit board 6, in order to avoid the inner end covers 71, 72, 73 from interfering with the electromagnetic field generated by the rotor 4, in the above embodiments 1-3, the inner end covers 71, 72, 73 can be made of non-ferromagnetic materials, specifically, the materials of the inner end covers 71, 72, 73 can be relatively high-strength metal materials, such as non-magnetic metal materials such as copper, aluminum, stainless steel, or rubber materials. Selecting metal materials to make the inner end covers 71, 72, 73 can improve the support for the rotating shaft 5, and selecting rubber materials to make the inner end covers 71, 72, 73 can further improve the waterproof performance of the waterproof motor 1. Those skilled in the art can flexibly select from the above two materials and other suitable materials as needed.

[0061] The above merely describes the preferred embodiments of the present application and is not intended to limit the present application. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present application shall be included in the protection scope of the present application.

[0062] Legend of reference signs

[0063] 1 waterproof motor

[0064] 2 motor housing

[0065] 2a outer end cover

[0066] 2b potting member

[0067] 3 stator

[0068] 4 rotor

[0069] 4a recessed portion

[0070] 5 rotating shaft

[0071] 6 circuit board

[0072] 61 cavity

[0073] 71, 72, 73 inner end cover

[0074] 71a first surrounding portion

[0075] 71b second wrap-around portion

[0076] 71c edge portion

[0077] 72a sleeve portion

[0078] 72c edge portion

[0079] 8 seal ring

[0080] 9 shaft sleeve

[0081] 10a first seal ring of shaft sleeve

[0082] 10b second seal ring of shaft sleeve

[0083] 11 bearing

Claims

1. A waterproof motor, comprising: a stator arranged on a motor housing; a rotor arranged in the motor housing; a rotating shaft connected with the rotor and extending out of the motor housing; a circuit board arranged in the motor housing, characterized in that an inner end cover is further arranged in the motor housing between the rotor and the circuit board, the inner end cover surrounds the rotating shaft and extends along a radial direction of the rotating shaft, the rotating shaft penetrates through the inner end cover, and an edge portion of the inner end cover away from the rotating shaft is tightly attached to the motor housing; the inner end cover further comprises a sleeve portion, the sleeve portion is formed by extending from a side of the inner end cover away from the rotor along the rotating shaft, a sealing ring is arranged between the sleeve portion and the motor housing, the sleeve portion is in sliding connection with the rotating shaft and can support the rotating shaft; or the waterproof motor further comprises a shaft sleeve, a first sealing ring of the shaft sleeve and a second sealing ring of the shaft sleeve, the shaft sleeve is arranged on a side of the circuit board in a form of being closely adjacent to the inner end cover, the first sealing ring of the shaft sleeve is arranged between the shaft sleeve and the inner end cover, the second sealing ring of the shaft sleeve is arranged between the shaft sleeve and the motor housing, the shaft sleeve is in sliding connection with the rotating shaft, and the rotating shaft is supported by the shaft sleeve.

2. The waterproof electric motor according to claim 1, characterized in that, one end of the inner end cover abuts against the rotating shaft.

3. The waterproof electric motor according to claim 2, characterized in that, a first surrounding portion surrounding the rotating shaft is arranged on a surface of the inner end cover towards the rotor.

4. The waterproof electric motor according to claim 3, characterized in that, a second surrounding portion surrounding the first surrounding portion is arranged on the surface of the inner end cover towards the rotor, and the second surrounding portion is tightly attached to the motor housing.

5. The waterproof electric motor according to claim 1, wherein a Hall element is arranged on the circuit board, and the inner end cover is made of a non-ferromagnetic material.

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