Sealing structure, motor and scrubber

Abstract

The utility model discloses a sealing structure, a motor and a scrubber, and relates to the technical field of motors, the sealing structure is used for the motor, the motor comprises a housing and a motor shaft rotatably arranged on the housing, and the sealing structure comprises a first annular sealing part fixedly arranged on the motor shaft in a sealing manner; the second annular sealing part is in sealing connection with the shell, and at least part of the second annular sealing part and the first annular sealing part are overlapped in the axial direction of the motor shaft; and the elastic piece is used for enabling the first annular sealing part and the second annular sealing part to abut against each other for sealing. According to the technical scheme provided by the utility model, the sealing structure of the motor is improved, the sealing performance is improved, and the assembling difficulty and the manufacturing cost of the motor are reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, and particularly relates to a sealing structure, a motor and a floor washer. Background Art

[0002] In the design of motors, in order to prevent moisture intrusion, sealing methods such as oil seals and labyrinth seals are generally adopted. Among them, although oil seals can effectively reduce friction and achieve waterproofing at low cost, they are prone to wear under high-speed operation, resulting in performance degradation and shortened service life. The labyrinth seal reduces friction and wear through a non-contact design, extends the service life and reduces power consumption. However, due to its high-precision requirements, assembly is relatively difficult, which may increase manufacturing costs and assembly difficulties. In short, current motors are difficult to achieve reliable sealing, low assembly difficulty and low manufacturing cost at the same time. Summary of the Utility Model

[0003] The main purpose of the utility model is to propose a sealing structure, a motor and a floor washer, aiming to improve the reliability of motor sealing and reduce the assembly difficulty and manufacturing cost of the motor.

[0004] To achieve the above object, a sealing structure proposed by the utility model is used for a motor. The motor includes a housing and a motor shaft rotatably provided in the housing. The sealing structure includes:

[0005] A first annular sealing portion, which is fixedly sealed on the motor shaft;

[0006] A second annular sealing portion, which is sealingly connected to the housing and at least partially overlaps with the first annular sealing portion in the axial direction of the motor shaft; and

[0007] An elastic member for tightly pressing and sealing the first annular sealing portion and the second annular sealing portion against each other.

[0008] In an embodiment, the second annular sealing portion includes:

[0009] A housing, which covers the outside of the first annular sealing portion and the elastic member and is sealingly connected to the housing;

[0010] A sealing member, which is sealingly connected to the housing, and the first annular sealing portion is tightly pressed and sealed against the sealing member.

[0011] In an embodiment, the inner wall of the housing includes a bottom wall and a side wall. The sealing member is slidably matched with the side wall. The first annular sealing portion is tightly pressed and sealed against the sealing member, and the sealing member is tightly pressed and sealed against the bottom wall.

[0012] In one embodiment, the second annular sealing portion further includes a sealing ring disposed between the sealing member and the bottom wall, and the sealing member and the bottom wall cooperate to clamp the sealing ring.

[0013] In one embodiment, a support edge protrudes from the edge of the sealing member, and the support edge extends circumferentially along the sealing member and is slidably engaged with the side wall.

[0014] In one embodiment, at least one of the sealing member and the first annular sealing portion is made of polytetrafluoroethylene.

[0015] In one embodiment, the housing is filled with grease; and / or,

[0016] The housing includes:

[0017] A housing body, which is hermetically connected to the outer shell. The housing body is provided with a receiving cavity with an opening on one side, and the first annular sealing portion and the sealing member are disposed in the receiving cavity;

[0018] A cover body, which is detachably disposed at the opening to close the receiving cavity.

[0019] In one embodiment, the elastic member is configured as a compression spring, and the compression spring is sleeved on the motor shaft.

[0020] In one embodiment, a first limiting groove is provided on one side of the first annular sealing portion facing the compression spring, and one end of the compression spring is embedded in the first limiting groove; and / or, a second limiting groove is provided on the inner wall of the housing, and one end of the compression spring is embedded in the second limiting groove.

[0021] In one embodiment, the first annular sealing portion and the motor shaft are in interference fit or bonded or in transitional fit or integrally formed.

[0022] The present utility model further provides a motor, including the above-mentioned sealing structure.

[0023] The present utility model further provides a floor washer, including the above-mentioned motor.

[0024] In the technical solution of the present utility model, this sealing structure is used for sealing between the motor shaft and the housing of a motor. This sealing structure includes a first annular sealing portion and a second annular sealing portion. The first annular sealing portion is fixedly arranged on the motor shaft, and the second annular sealing portion is sealingly connected to the housing, and at least a part of the second annular sealing portion overlaps with the first annular sealing portion in the axial direction of the motor shaft. In addition, this sealing structure further includes an elastic member, which connects the first annular sealing portion and the second annular sealing portion, so that the first annular sealing portion and the second annular sealing portion are in contact with each other to achieve sealing. Since the first annular sealing portion and the second annular sealing portion overlap in the axial direction of the motor shaft, the first annular sealing portion and the second annular sealing portion cooperate to achieve sealing in the axial direction. Under the action of the elastic member, the first annular sealing portion and the second annular sealing portion always maintain a tightly pressed state, thus ensuring the reliability of the sealing. In addition, since the first annular sealing portion and the second annular sealing portion are in surface-to-surface contact, the structure is simple. Moreover, since the first annular sealing portion and the second annular sealing portion are subjected to opposite acting forces exerted by the elastic member, the motor shaft and the housing will have a tendency of opposite movement, so that a preload can be provided to the bearings in the motor, improving the operating stability of the motor, and thus also reducing the assembly difficulty and manufacturing cost of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] 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 use in 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, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0026] Figure 1 It is a schematic cross-sectional structure diagram of the cooperation of the sealing structure, the housing and the motor shaft provided by the present utility model;

[0027] Figure 2 is Figure 1 a partial enlarged view of part A in

[0028] Figure 3 is Figure 2 a partial enlarged view of part B in

[0029] Figure 4 is Figure 2 a partial enlarged view of part C in

[0030] Figure 5 It is an exploded view of the structure of the sealing structure provided by the present utility model;

[0031] Figure 6 It is a schematic structure diagram of the cooperation between the motor shaft and the sealing structure in the present utility model;

[0032] Figure 7 This is a schematic structural diagram of the cooperation among the bearing, motor shaft and housing in the present utility model.

[0033] Explanation of the reference numerals in the attached drawings:

[0034] 10. Sealing structure; 20. Housing; 30. Motor shaft; 40. Bearing; 100. First annular sealing part; 110. First limiting groove; 200. Second annular sealing part; 210. Housing body; 211. Second limiting groove; 220. Sealing element; 221. Supporting edge; 230. Sealing ring; 300. Elastic element.

[0035] 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 attached drawings. Specific embodiments

[0036] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described with reference to the attached 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.

[0037] 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 among the components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0038] 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, or solution B, or the solution where A and B are satisfied simultaneously. In addition, the technical solutions among 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 them. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present utility model.

[0039] The shaft-end seals of traditional motors generally adopt oil seals or labyrinth seals. Among them, oil seals are prone to wear under high-speed operation, resulting in performance degradation and shortened service life. Labyrinth seals have high precision requirements and are difficult to assemble, which may increase manufacturing costs and assembly difficulties. The current sealing methods are difficult to balance cost and sealing reliability.

[0040] Therefore, this technical solution proposes a sealing structure 10 for a motor. The motor includes a housing 20 and a motor shaft 30 rotatably disposed in the housing 20. The sealing structure 10 includes:

[0041] A first annular sealing portion 100, which is fixedly sealed on the motor shaft 30;

[0042] A second annular sealing portion 200, which is sealingly connected to the housing 20 and at least partially overlaps with the first annular sealing portion 100 in the axial direction of the motor shaft 30; and

[0043] An elastic member 300 for pressing the first annular sealing portion 100 and the second annular sealing portion 200 tightly against each other for sealing.

[0044] In the technical solution of the present utility model, the sealing structure 10 is used for sealing between the motor shaft 30 and the housing 20 of the motor. The sealing structure 10 includes a first annular sealing portion 100 and a second annular sealing portion 200. The first annular sealing portion 100 is fixedly arranged on the motor shaft 30. The second annular sealing portion 200 is sealingly connected to the housing 20, and at least part of the second annular sealing portion 200 overlaps with the first annular sealing portion 100 in the axial direction of the motor shaft 30. In addition, the sealing structure 10 further includes an elastic member 300. The elastic member 300 connects the first annular sealing portion 100 and the second annular sealing portion 200, so that the first annular sealing portion 100 and the second annular sealing portion 200 are in contact with each other to achieve sealing. Since the first annular sealing portion 100 and the second annular sealing portion 200 overlap in the axial direction of the motor shaft 30, the first annular sealing portion 100 and the second annular sealing portion 200 cooperate to achieve axial sealing. Under the action of the elastic member 300, the first annular sealing portion 100 and the second annular sealing portion 200 always maintain a tightly pressed state, thus ensuring the reliability of the sealing; in addition, since the first annular sealing portion 100 and the second annular sealing portion 200 are in surface-to-surface contact, the structure is simple, so the assembly difficulty and manufacturing cost can be reduced; in addition, since the first annular sealing portion 100 and the second annular sealing portion 200 are subjected to opposite acting forces applied by the elastic member 300, the motor shaft 30 and the housing 20 will have a tendency of opposite movement, so that a preload can be provided for the bearing 40 in the motor, improving the stability of the motor operation.

[0045] Such as Figures 1 to 3, motors in devices such as floor scrubbers generally have waterproof requirements. The sealing structure 10 in the present utility model is applied to such motors, specifically for sealing between the motor shaft 30 and the outer shell 20 of the motor. Among them, the motor shaft 30 is rotatably connected to the outer shell 20, and one end of the motor shaft 30 penetrates to the outside of the outer shell 20. The sealing structure 10 includes a first annular sealing portion 100, which may be a circular sheet structure. The first annular sealing portion 100 is sleeved on one end of the motor shaft 30, and a sealing fit relationship is formed between the first annular sealing portion 100 and the motor shaft 30. A second annular sealing portion 200 is sealingly connected to the outer shell 20, which may also be a circular sheet structure. The second annular sealing portion 200 plugs the position where the motor shaft 30 penetrates through the outer shell 20 and is sealingly connected to the outer shell 20. In addition, the first annular sealing portion 100 and the second annular sealing portion 200 can be coaxially arranged and overlap axially on the motor shaft 30. In addition, the sealing structure 10 further includes an elastic member 300, which can undergo elastic deformation. The elastic member 300 connects the first annular sealing portion 100 and the second annular sealing portion 200 and makes the first annular sealing portion 100 and the second annular sealing portion 200 elastically abut. A surface contact and sealing fit are formed between the first annular sealing portion 100 and the second annular sealing portion 200. Different from oil seals and labyrinth tooth seals, when the motor shaft 30 vibrates radially, since the first annular sealing portion 100 and the second annular sealing portion 200 are in surface contact axially, there is no risk of sealing failure. In addition, since the first annular sealing portion 100 and the second annular sealing portion 200 are tightly abutted under the action of the elastic member 300, even if the motor shaft 30 and the outer shell 20 vibrate axially or any one of the first annular sealing portion 100 and the second annular sealing portion 200 is worn, the elastic member 300 can compensate in time through deformation to ensure that the first annular sealing portion 100 and the second annular sealing portion 200 always tightly abut when the motor shaft 30 and the outer shell 20 have relative displacement, improving the reliability of the sealing effect of the sealing structure 10. In addition, as Figure 6 , since the first annular sealing portion 100 is fixed to the motor shaft 30 and the second annular sealing portion 200 is fixed to the outer shell 20, the elastic member 300 can apply a force in the direction of the arrow in Figure 6 to the motor shaft 30 through the first annular sealing portion 100. Since the bearing 40 generally has a rotatably connected outer ring and inner ring, the inner ring is fixed on the motor shaft 30 and the outer ring is fixed on the outer shell 20. In Figure 7 , the force received by the above-mentioned motor shaft 30 will continue to be transmitted to the inner ring of the bearing 40. Since the outer ring is fixed to the outer shell 20, the outer shell 20 will give the outer ring a force in Figure 7The reaction force indicated by the arrow, which is opposite to the direction of the force received by the inner ring described above. In this way, it can make the outer ring and the inner ring of the bearing 40 have a tendency to be staggered axially, so that the outer ring and the inner ring can be in close contact, achieving the effect of preloading the bearing 40, that is, eliminating the axial play clearance of the bearing 40, and improving the stability of the motor operation. In addition, in the traditional motor structure, it is generally necessary to set a wave washer on the motor shaft 30 to preload the bearing 40. However, in this solution, since the sealing structure 10 itself has the effect of preloading the bearing 40, the motor provided with this sealing structure 10 can omit the setting of the wave washer, which is equivalent to reducing the number of components of the motor, facilitating reducing the structural complexity of the motor and reducing the manufacturing cost of the motor.

[0046] Such as Figure 2 and Figure 3 , in an embodiment of the present invention, the second annular sealing portion 200 includes: a housing 210, the housing 210 covers the outside of the first annular sealing portion 100 and the elastic member 300 and is hermetically connected to the outer housing 20; a sealing member 220, which is hermetically connected to the housing 210, and the first annular sealing portion 100 is tightly abutted and sealed with the sealing member 220. The housing 210 is hollow, the housing 210 is embedded in the outer housing 20, and forms a sealing fit with the outer housing 20 by means of bonding or welding, etc. In addition, a through hole is provided on the housing 210, and the through hole is coaxially arranged with the motor shaft 30, and the motor shaft 30 can pass through the through hole to extend to the outside of the outer housing 20; both the first annular sealing portion 100 and the elastic member 300 are arranged inside the housing 210. In addition, a sealing member 220 is arranged inside the housing 210, the sealing member 220 is hermetically connected to the housing 210, the sealing member 220 can be a plate-like structure, the sealing member 220 is sleeved on the motor shaft 30, and is attached to and forms a sealing fit with the position where the motor shaft 30 penetrates through the housing 210. The sealing member 220 and the elastic member 300 are arranged on opposite sides of the first annular sealing portion 100. One end of the elastic member 300 abuts against the inner wall of the housing 210, and the other end abuts against the first annular sealing portion 100. Since the elastic member 300 applies forces in opposite directions to the housing 210 and the first annular sealing portion 100, it can make the housing 210 and the first annular sealing portion 100 have a tendency to move in opposite directions, and further make the sealing member 220 and the first annular sealing portion 100 tightly abut, realizing sealing; in this solution, the housing 210 can provide protection for other components, which is beneficial to improving the reliability of the seal and extending the service life of the sealing structure 10 and the motor.

[0047] Such as Figure 2, in an embodiment of the present utility model, the inner wall of the housing 210 includes a bottom wall and a side wall. The seal 220 is slidably engaged with the side wall, and the first annular seal portion 100 is tightly abutted and sealed with the seal 220, and the seal 220 is tightly abutted and sealed with the bottom wall. Wherein, the housing 210 has a cylindrical structure, the motor shaft 30 of the housing 210 passes through the bottom wall of the housing 210, and the side wall of the housing 210 extends around the motor shaft 30. The seal 220 has a circular plate-like structure, and the outer side wall of the seal 220 is slidably engaged with the side wall of the housing 210 so that the seal 220 can move axially along the motor shaft 30. The seal 220 can be fitted and sealed with the bottom wall, the first annular seal portion 100 can be fitted and sealed with the seal 220, and the seal 220 abuts against the side wall of the housing 210, which can provide support for the housing 210 and improve the strength of the housing 210. In addition, the seal 220 can be configured with wear-resistant material, so as to improve the sealing reliability between the first annular seal portion 100 and the seal 220, and at the same time prevent the wear of the housing 210 and ensure the protection performance of the housing 210.

[0048] Such as Figure 2 and Figure 3 , in an embodiment of the present utility model, the second annular seal portion 200 further includes a sealing ring 230, and the sealing ring 230 is arranged between the seal 220 and the bottom wall, and the seal 220 and the bottom wall cooperate to clamp the sealing ring 230. The sealing ring 230 can be an ordinary rubber ring. The sealing ring 230 is arranged between the second annular seal portion 200 and the seal 220, and the seal 220 and the bottom wall can cooperate to clamp the sealing ring 230. The sealing ring 230 can fill the gap between the seal 220 and the bottom wall, thereby improving the sealing reliability between the seal 220 and the bottom wall. In addition, the sealing ring 230 can also absorb the axial impact of the motor shaft 30 or the housing 210 through elastic deformation, ensure that the first annular seal portion 100 is tightly abutted with the seal 220, and also ensure that the seal 220 is tightly abutted with the bottom wall, and improve the sealing reliability of the sealing structure 10.

[0049] Such as Figure 2 , in an embodiment of the present utility model, a support edge 221 is convexly provided on the edge of the seal 220, and the support edge 221 extends along the circumferential direction of the seal 220 and is slidably engaged with the side wall. The support edge 221 extends along the edge of the seal 220, and the outer side wall of the support edge 221 is also slidably engaged with the side wall of the housing 210. By using the support of the support edge 221 and the side wall of the housing 210, the seal 220 can be prevented from yawing, ensuring that the seal 220 is always parallel to the first annular seal portion 100 and the bottom wall of the housing 210, and improving the sealing reliability between the seal 220 and the first annular seal portion 100, and also improving the sealing reliability between the seal 220 and the bottom wall of the housing 210.

[0050] In another embodiment of the present utility model, the material of at least one of the seal 220 and the first annular seal portion 100 is polytetrafluoroethylene. Since polytetrafluoroethylene has a low friction coefficient and good self-lubricating performance, using this material can reduce the friction between the first annular seal portion 100 and the seal 220, reduce the loss of power output of the motor shaft 30, and at the same time reduce the wear of the first annular seal portion 100 and the seal 220, extending the service life of the sealing structure 10 and the motor. Additionally, it can be envisioned that using other types of materials with self-lubricating characteristics for the seal 220 and the first annular seal portion 100 can also achieve the above effects, which are not limited herein.

[0051] In another embodiment of the present utility model, the housing 210 is filled with grease, which can be solid grease. The grease can fill all the gaps within the housing 210. In this way, not only can the hydrophobic characteristics of the grease be utilized to further improve the sealing effect, but also the first annular seal portion 100 and the second annular seal portion 200 can be lubricated by the grease, reducing the friction between the rotation of the first annular seal portion 100 and the seal 220, thereby reducing the resistance on the motor shaft 30, reducing the loss of power output of the motor shaft 30, improving the efficiency of the motor, and additionally reducing the wear of the first annular seal portion 100 and the second annular seal portion 200, which is beneficial for extending the service life of the sealing structure 10 and the motor.

[0052] In another embodiment of the present utility model, the housing 210 includes: a housing body, which is sealingly connected to the outer housing 20. The housing body is provided with a receiving cavity with an opening on one side, and the first annular seal portion 100 and the seal 220 are disposed within the receiving cavity; a cover body, which is detachably disposed at the opening to close the receiving cavity. Among them, the housing body has a receiving cavity with an opening on one side, and the first annular seal portion 100, the seal 220, and the sealing ring 230 can all be accommodated within the receiving cavity. The cover body is buckled on the housing body and connected to the housing body by means such as welding or bonding. During assembly, the first annular seal portion 100 and other components such as the seal 220 can first be placed in the receiving cavity, and the housing body can be connected to the outer housing 20 of the motor. The first annular seal portion 100 is connected to the motor shaft 30, and then the cover body is connected to the housing body. In this way, the assembly of the sealing structure 10 can be facilitated, reducing the difficulty of assembly.

[0053] As Figure 1 and Figure 2 , in another embodiment of the present utility model, the elastic member 300 is configured as a compression spring, and the compression spring is sleeved on the motor shaft 30. The good axial support of the compression spring ensures the tightness of the sealing fit between the first annular seal portion 100 and the second annular seal portion 200. Additionally, the compression spring being sleeved on the motor shaft 30 also makes the sealing structure 10 more compact, reducing the size of the sealing structure 10.

[0054] In another embodiment of the present utility model, a first limiting groove 110 is provided on one side of the first annular sealing portion 100 facing the compression spring. One end of the compression spring is embedded in the first limiting groove 110. The first limiting groove 110 can be a circular groove, and the size of the first limiting groove 110 can be adapted to the outer diameter size of the compression spring. One end of the compression spring is embedded in the first limiting groove 110 and can interfere with the inner wall of the first limiting groove 110, preventing relative displacement between the compression spring and the first limiting groove 110 in the radial direction, ensuring the stability of the spring during expansion and contraction, and thus improving the reliability of the gasket of the sealing structure 10. Similarly, a second limiting groove 211 is provided on the inner wall of the housing 210. One end of the compression spring is embedded in the second limiting groove 211. The second limiting groove 211 is similar in structure to the first limiting groove 110. The first limiting groove 110 and the second limiting groove 211 can be provided at opposite ends of the spring. The spring is limited by the cooperation of the first limiting groove 110 and the second limiting groove 211, ensuring that the spring always expands and contracts along the axial direction, and further ensuring the stability of the abutment between the first annular sealing portion 100 and the second annular sealing portion 200 and the reliability of the sealing of the sealing structure 10.

[0055] In another embodiment of the present utility model, the first annular sealing portion 100 is in interference fit or bonded or transition fit or integrally formed with the motor shaft 30. Among them, a through hole can be opened in the center of the first annular sealing portion 100, and the motor shaft 30 passes through the through hole. The motor shaft 30 and the through hole can be in interference fit or transition fit to achieve the sealing fit between the motor shaft 30 and the first annular sealing portion 100. The motor shaft 30 and the through hole can also be connected by bonding for convenient assembly. In addition, in order to reduce the number of components and simplify the sealing structure 10, the first annular sealing portion 100 can also be integrally formed on the motor shaft 30.

[0056] The present utility model also proposes a motor, which includes a housing 20 and a motor shaft 30 rotatably provided on the housing 20. The motor further includes a sealing structure 10, which is used to seal the gap between the housing 20 and the motor shaft 30, improving the waterproof and dustproof performance of the motor. The specific structure of the sealing structure 10 refers to the above embodiments. Since this motor adopts all the technical solutions of the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be elaborated here one by one.

[0057] The present utility model also provides a motor, which comprises a housing 20 and a motor shaft 30 rotatably arranged on the housing 20. The motor further comprises a sealing structure 10 for sealing the gap between the housing 20 and the motor shaft 30 to improve the waterproof and dustproof performance of the motor. The specific structure of the sealing structure 10 refers to the above embodiments. Since this motor adopts all the technical solutions of the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be elaborated herein one by one.

[0058] The present utility model also provides a floor washer, which comprises a main body and a rotary brush rotatably arranged on the main body. A motor is arranged on the main body to drive the rotary brush to rotate, so as to realize the function of cleaning the ground. The specific structure of the motor refers to the above embodiments. Since this floor washer adopts all the technical solutions of the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be elaborated herein one by one. In addition, it can be conceived that the motor in the present utility model is not only applicable to the above floor washer models, but also can be applied to vacuum cleaners or devices with dustproof and waterproof requirements, which are not limited herein.

[0059] The above are only exemplary embodiments of the present utility model, and do not limit the patent scope of the present utility model. Any equivalent structural transformation made under the technical concept of the present utility model by using the content of the specification and drawings of the present utility model, or any direct / indirect application in other related technical fields is included in the patent protection scope of the present utility model.

Claims

1. A sealing structure for a motor, the motor comprising a housing and a motor shaft rotatably arranged on the housing, characterized in that: The sealing structure comprises: A first annular sealing portion, sealingly fixed to the motor shaft; a second annular sealing portion, sealingly connected to the housing and at least partially overlapping the first annular sealing portion in the axial direction of the motor shaft; and The elastic member is used to make the first annular sealing part and the second annular sealing part abut against each other to seal tightly.

2. The sealing structure according to claim 1, characterized in that: The second annular sealing portion comprises: A housing, wherein the housing cover is disposed outside the first annular sealing portion and the elastic member and is sealed and connected to the outer shell; A sealing member is sealed and connected to the housing, and the first annular sealing portion is tightly sealed against the sealing member.

3. The sealing structure according to claim 2, characterized in that: The inner wall of the shell includes a bottom wall and a side wall, the sealing member is slidably matched with the side wall, the first annular sealing portion is tightly sealed against the sealing member, and the sealing member is tightly sealed against the bottom wall.

4. The sealing structure according to claim 3, characterized in that: The second annular sealing portion further comprises a sealing ring, which is arranged between the sealing member and the bottom wall, and the sealing member cooperates with the bottom wall to clamp the sealing ring.

5. The sealing structure according to claim 4, characterized in that: A supporting edge is protruded from the edge of the sealing member, and the supporting edge extends along the circumference of the sealing member and is slidably matched with the side wall.

6. The sealing structure according to claim 3, characterized in that: At least one of the sealing member and the first annular sealing portion is made of polytetrafluoroethylene.

7. The sealing structure according to claim 2, characterized in that: The housing is filled with grease; and / or, The housing comprises: A shell body is sealed and connected to the outer shell, the shell body is provided with a receiving cavity with one side open, the first annular sealing portion and the sealing member are arranged in the receiving cavity; The cover body is detachably arranged on the opening to close the accommodating cavity.

8. The sealing structure according to claim 2, characterized in that: The elastic member is configured as a compression spring, and the compression spring is sleeved on the motor shaft.

9. The sealing structure according to claim 8, characterized in that: A first limiting groove is provided on the first annular sealing portion on a side facing the compression spring, and one end of the compression spring is embedded in the first limiting groove; and / or a second limiting groove is provided on the inner wall of the shell, and one end of the compression spring is embedded in the second limiting groove.

10. The sealing structure according to claim 1, characterized in that: The first annular sealing portion and the motor shaft are interference fit, bonded, transition fit, or integrally formed.

11. A motor, characterized in that: A sealing structure comprising any one of claims 1 to 10.

12. A floor scrubber, characterized in that: The invention comprises the motor as claimed in claim 11.

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