Waterproof assembly for output shaft of cleaning appliance and electric toothbrush

Abstract

The embodiment of the utility model discloses an output shaft waterproof assembly of a cleaning appliance, and the output shaft waterproof assembly of the cleaning appliance comprises a motor support and an inner sealing structure. The inner sealing structure comprises a supporting base arranged outside the output shaft in a sleeving mode and a movable sealing piece fixedly connected to the outer wall of the output shaft. The supporting base is fixed to the upper end of the motor support, and a sealing ring groove surrounding the output shaft is formed in the inner circumferential wall of the supporting base. The movable sealing piece can be installed in the sealing ring groove in a radial sealing mode and can rotate along with the output shaft. The waterproof assembly of the output shaft of the cleaning appliance can meet the waterproof requirement for large-amplitude rotation of the output shaft.

Description

Technical Field

[0001] The present application relates to the technical field of personal cleaning and care, and in particular to an output shaft waterproof component of a cleaning appliance and an electric toothbrush. Background Art

[0002] There are various cleaning tools on the market, such as electric toothbrushes and tongue brushes for oral cleaning. Since the above cleaning tools are often exposed to water during use, in order to prevent water from entering the motor through the gap between the motor shaft and the housing and causing product failure, it is necessary to reasonably design the sealing and waterproof structure of the output shaft of the cleaning tool.

[0003] In the related art, in order to further improve the user experience of the electric toothbrush, the output shaft is rotated greatly around its axis to drive the brush head to rotate, simulating the up and down swinging of human hands to brush teeth. In this mode, if only a waterproof ring is set between the output shaft and the brush handle shell, it cannot meet the waterproof requirement of the large rotation of the output shaft.

[0004] The above contents are only used to assist in understanding the technical solutions of the utility model and do not constitute an admission that the above contents are prior art. Utility Model Content

[0005] In view of the above problems, the utility model proposes an output shaft waterproof component of a cleaning tool, aiming to solve the technical problem that the output shaft waterproof component of the cleaning tool cannot meet the waterproof requirement of large rotation of the output shaft.

[0006] To achieve the above-mentioned purpose, the output shaft waterproof assembly of the cleaning device proposed by the utility model includes a motor bracket and an inner sealing structure;

[0007] The inner sealing structure comprises a support seat for sleeved outside the output shaft and a movable sealing member for fixedly connected to the outer wall of the output shaft;

[0008] The support seat is fixedly connected to the upper end of the motor bracket, and the inner peripheral wall of the support seat is provided with a sealing ring groove surrounding the output shaft;

[0009] The movable seal can be installed in the sealing ring groove in a radially sealing manner along with the rotation of the output shaft.

[0010] In one embodiment, the support base is detachably fixed to the upper end of the motor bracket.

[0011] In one embodiment, the motor bracket includes a cylinder and a connecting portion fixedly connected to the top wall of the cylinder, and the support seat is fixed to the top wall of the cylinder through the connecting portion.

[0012] In one embodiment, the connecting portion includes a connecting arm integrally formed on the top wall surface of the cylinder, and the connecting arm is detachably connected to the supporting seat.

[0013] In one embodiment, the top wall surface of the cylinder is provided with at least one pair of connecting arms which are opposite to each other in the axial direction of the output shaft, and a plurality of the connecting arms are clamped to the periphery of the support seat.

[0014] In one embodiment, the support seat includes an upper support member and a lower support member that are fixedly connected, the upper support member and the lower support member enclose the sealing ring groove, the upper sealing surface is formed on the upper support member, and the lower sealing surface is formed on the lower support member; the connecting arm is clamped on the top wall surface of the lower support member, and the upper support member is provided with a avoidance notch corresponding to the connecting arm.

[0015] In one embodiment, the upper support member includes a top plate and an anti-rotation protruding ring arranged on the bottom wall of the top plate, the lower support member is in the shape of a cylinder with an open upper end, and a groove is provided at the connection between the top wall and the inner circumferential wall of the lower support member; the top plate covers the top wall of the lower support member, the avoidance notch is provided on the top plate, the anti-rotation protruding ring is installed in the groove at the axial upper limit position around the output shaft, and the inner circumferential wall of the lower support member and the inner circumferential wall of the anti-rotation protruding ring jointly form the inner circumferential wall of the sealing ring groove.

[0016] In one embodiment, the thickness of the top plate is smaller than the axial height of the lower support member in the output shaft; a screw mounting hole is provided on the top wall of the cylinder, and a screw avoidance space is provided on the bottom wall of the lower support member corresponding to the screw mounting hole.

[0017] In one embodiment, the sealing ring groove has an upper sealing surface and a lower sealing surface which are opposite to each other in the axial direction of the output shaft, the top wall surface and the bottom wall surface of the movable seal are fixedly connected with the radial sealing portion, the radial sealing portion is sealed and rotatably matched with the upper sealing surface and the lower sealing surface, and the outer peripheral wall of the movable seal is spaced apart from the peripheral side wall of the sealing ring groove to form an oil seal cavity for filling lubricating oil.

[0018] In one embodiment, the output shaft waterproofing assembly of the cleaning tool also includes an outer seal, which includes an inner sealing cylinder, an outer sealing cylinder and a sealing sheet connected between the inner sealing cylinder and the outer sealing cylinder, the inner sealing cylinder is used for sealing and is sleeved outside the output shaft so as to allow the output shaft to rotate, the outer sealing cylinder is adapted to be mounted on the periphery of the support seat, and the top wall of the support seat abuts against the bottom wall of the sealing sheet.

[0019] In one embodiment, the support seat is made of a hard material, and the movable sealing element is made of a flexible material.

[0020] The utility model also proposes an electric toothbrush, comprising a brush head assembly, a brush handle shell, a motor and an output shaft waterproof assembly of the cleaning tool described in any of the above embodiments, wherein the output shaft waterproof assembly is installed in the brush handle shell, the motor body of the motor is installed in the motor body of the output shaft waterproof assembly, and the output shaft of the motor extends out of the brush handle shell through the output shaft waterproof assembly to be connected to the brush head assembly.

[0021] The output shaft waterproof assembly of the cleaning device of the utility model is provided with a sealing ring groove on the inner peripheral wall of the support seat, so that the movable seal is sealed and fixedly connected to the outer wall of the output shaft, and the movable seal is sealed and can be installed in the sealing ring groove in a radial seal with the rotation of the output shaft. In this way, the radial sealing effect can be guaranteed when the output shaft rotates greatly, thereby meeting the waterproof demand of the output shaft rotating greatly. The inner sealing structure of the output shaft waterproof assembly of the cleaning device of the utility model is fixed to the upper end of the motor bracket through the support seat. Compared with the design of providing a sealing ring groove on the motor bracket and embedding the movable seal in the sealing ring groove of the motor bracket, the sealing ring groove for the movable seal to rotate can be independently removed from the motor bracket through the support seat. In this way, the inner sealing structure as a whole can be pre-assembled into an integrated module, and the inner sealing structure is modularly assembled to the motor bracket, which can simplify the assembly steps of the cleaning device and improve the assembly efficiency. At the same time, the sealing surface for the movable seal to rotate and seal is formed on an independent support seat, which is easier to control the manufacturing accuracy than being formed on the motor bracket. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0023] Figure 1 It shows a schematic structural diagram of an output shaft waterproof assembly of an embodiment of the cleaning device of the utility model;

[0024] Figure 2 for Figure 1 Schematic diagram of the exploded structure of the middle output shaft waterproof component;

[0025] Figure 3 It is a structural schematic diagram of another embodiment of the output shaft waterproof assembly of the cleaning device of the utility model;

[0026] Figure 4 for Figure 3 A cross-sectional view of the middle output shaft waterproof component at one angle;

[0027] Figure 5It is a schematic diagram of the exploded structure of an embodiment of the inner sealing structure of the output waterproof assembly of the cleaning device of the utility model;

[0028] Figure 6 for Figure 5 A schematic diagram of the structure of the middle and inner sealing structure from another angle;

[0029] Figure 7 It is a cross-sectional view at one angle after the output shaft waterproof component and the brush handle housing are assembled;

[0030] Figure 8 It is a structural schematic diagram of an embodiment of the electric toothbrush of the utility model.

[0031] Description of Figure Numbers:

[0032] Label name Label name Label name 100 Output shaft waterproof assembly 124 Lower sealing surface 151 Radial seal 110 Motor bracket 130 Upper support 160 Oil seal chamber 111 Cylinder 131 Avoid gap 170 Outer seal 112 Screw mounting holes 132 roof 171 Inner sealing cylinder 113 Connecting arm 133 Anti-rotation convex ring 172 Outer sealing cylinder 120 Internal sealing structure 140 Lower support 173 Sealing sheet 121 Support seat 141 Bezel 200 Output shaft 122 Sealing ring groove 142 Screw clearance space 300 Brush handle housing 123 Upper sealing surface 150 Active seals

[0033] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0035] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0036] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text is to include three parallel solutions. Taking "A and / or B" as an example, it includes solution A, or solution B, or a solution that satisfies both A and B.

[0037] The utility model provides an output shaft waterproof component of a cleaning tool.

[0038] In the embodiment of the present utility model, please refer to Figures 1 to 7 The output shaft 200 waterproof component 100 of the cleaning tool includes a motor bracket 110 and an inner sealing structure 120; the inner sealing structure 120 includes a support seat 121 for being sleeved on the outside of the output shaft 200 and a movable sealing member 150 for being fixedly connected to the outer wall of the output shaft 200; the support seat 121 is fixedly connected to the upper end of the motor bracket 110, and the inner circumferential wall of the support seat 121 is provided with a sealing ring groove 122 surrounding the output shaft 200; the movable sealing member 150 can be radially sealed and installed in the sealing ring groove 122 as the output shaft 200 rotates.

[0039] In this embodiment, for ease of explanation, the orientation of the cleaning device when in use is used as a reference, and the axial direction of the output shaft is consistent with the up and down direction. The motor bracket 110 is used for the installation of the power supply motor. The structure of the motor bracket 110 can be many, for example, the whole can be cylindrical, cover-shaped, etc., which are not specifically limited here. The output shaft 200 mainly plays the role of connection and transmission. For example, in the embodiment where the output shaft 200 waterproof component 100 is applied to an electric toothbrush, the upper end of the output shaft 200 is used to install the brush head, and the lower end forms a part of the motor rotor. It can be understood that the output shaft 200 and the motor rotor can be set separately, for example, a transmission mechanism can be added between the two.

[0040] The support seat 121 can be specifically fixed on the top of the motor bracket 110 in a detachable manner, or can be connected to the top of the motor bracket 110 by bonding or other means. The support seat 121 is sleeved on the periphery of the output shaft 200 and will not interfere with the rotation of the output shaft 200. The movable seal 150 is sealed and fixedly connected to the outer wall of the output shaft 200, so that the movable seal 150 can rotate with the output shaft 200. By providing a sealing ring groove 122 on the inner peripheral wall of the support seat 121, the movable seal 150 can be rotatably installed in the sealing ring groove 122. When working, the support seat 121 is fixed and cannot rotate relative to the motor bracket 110, and the output shaft 200 drives the movable seal 150 to rotate in the sealing ring groove 122 of the support seat 121. During assembly, the entire inner sealing structure 120 is fixedly connected to the motor bracket 110 through the support seat 121, which is more convenient for modular assembly of the entire inner sealing structure 120.

[0041] The support seat 121 provides support and installation space for the movable seal 150. The movable seal 150 is radially sealed and installed in the sealing ring groove 122, which means that the movable seal 150 and the inner wall surface of the sealing ring groove 122 are sealed in the radial direction of the output shaft 200 to prevent water from flowing into the sealing ring groove 122 from the radial direction of the output shaft 200. A sealing ring can be set between the top wall and the bottom wall of the movable seal 150 and the inner wall surface of the sealing ring groove 122 to achieve the sealing of the two, so as to achieve the radial sealing of the output shaft 200. Specifically, a sealing ring can be set on the top wall and the bottom wall of the movable seal 150. Furthermore, the support seat 121 is made of a hard material, and the movable seal 150 is made of a flexible material. The support seat 121 can specifically be made of hard materials such as plastics and alloys, and the movable seal 150 can specifically be made of flexible materials such as rubber and silicone. The radial sealing is achieved by the cooperation of the flexible movable seal 150 and the hard support seat 121. Compared with the radial sealing achieved by the cooperation of the flexible movable seal 150 and the flexible outer seal 170, it can effectively avoid the deformation of the seal and the failure of the seal, thereby ensuring the radial sealing effect.

[0042] The output shaft 200 waterproof assembly 100 of the cleaning device of the present invention is provided with a sealing ring groove 122 on the inner peripheral wall of the support seat 121, so that the movable seal 150 is sealed and fixedly connected to the outer wall of the output shaft 200. The movable seal 150 is radially sealed and can be installed in the sealing ring groove 122 to rotate with the output shaft 200. In this way, the radial sealing effect can be guaranteed when the output shaft 200 rotates greatly, thereby meeting the waterproof requirement of the output shaft 200 rotating greatly. The inner sealing structure 120 of the output shaft 200 waterproof assembly 100 of the cleaning device of the present application is detachably fixed to the upper end of the motor bracket 110 through the support seat 121. Compared with the design of providing the sealing ring groove 122 on the motor bracket 110 so that the movable seal 150 is embedded in the sealing ring groove 122 of the motor bracket 110, the sealing ring groove 122 for the movable seal 150 to rotate in a sealed manner can be independently removed relative to the motor bracket 110 through the support seat 121. In this way, the inner sealing structure 120 as a whole can be pre-assembled into an integrated module, and the inner sealing structure 120 can be modularly assembled to the motor bracket 110, which can simplify the assembly steps of the cleaning device and improve the assembly efficiency. After the active seal 150 fails and ages, the entire inner sealing structure 120 can be replaced separately, reducing the product maintenance cost. At the same time, the upper sealing surface 123 and the lower sealing surface 124 for the active seal 150 to rotate and seal are formed on the independent support seat 121, which is easier to control the manufacturing accuracy than being formed on the motor bracket 110.

[0043] In one embodiment, the support seat 121 is detachably fixed to the upper end of the motor bracket 110. The support seat 121 can be detachably fixed to the upper end of the motor bracket 110 by means of clamping, screws, embedding, etc. The inner sealing structure 120 is detachably fixed to the upper end of the motor bracket 110 through the support seat 121, that is, the sealing ring groove 122 for the movable seal 150 to seal and rotate can be independently removed relative to the motor bracket 110 through the support seat 121. In this way, after the movable seal 150 fails and ages, the entire inner sealing structure 120 can be replaced separately, thereby reducing the product maintenance cost.

[0044] In one embodiment, please refer to Figure 1 , Figure 2 and Figure 4 The motor bracket 110 includes a cylinder 111 and a connecting portion connected to the top wall of the cylinder 111, and the support seat 121 is fixed to the top wall of the cylinder 111 through the connecting portion.

[0045] In the present embodiment, it is understood that the cylinder 111 has a cylinder top wall, and the cylinder 111 as a whole can be sleeved on the motor body from top to bottom. There can be many structures and forms of the connecting portion, for example, the connecting portion can include one or more of a sleeve structure, a holding arm, and a bayonet. For example, a pin hole can be provided on the support seat 121, so that the connecting portion includes a bayonet, so that the bayonet is inserted into the pin hole to fix the connection support seat 121. By arranging a connecting portion on the cylinder 111 to connect the support seat 121, the structure of the support seat 121 can be simplified, which is convenient for modular manufacturing of the entire inner sealing structure 120.

[0046] Furthermore, the connecting portion includes a connecting arm 113 integrally formed on the top wall surface of the cylinder 111 , and the connecting arm 113 is detachably connected to the supporting seat 121 .

[0047] In this embodiment, the connecting arm 113 and the cylinder 111 are integrally formed to ensure the connection strength between the connecting arm 113 and the cylinder 111, thereby ensuring the connection stability between the connecting arm 113 and the support seat 121. The number of the connecting arms 113 can be one or more. The support seat 121 of the inner sealing structure 120 is fixed by the connecting arm 113 of the motor bracket 110, which makes it easier to disassemble and assemble the inner sealing structure 120, simplifies the assembly steps, and effectively improves the assembly efficiency.

[0048] Furthermore, the top wall surface of the cylinder 111 is provided with at least one pair of connecting arms 113 which are opposite to each other in the axial direction of the output shaft 200, and the multiple connecting arms 113 are clamped to the periphery of the support seat 121. In this way, the multiple connecting arms 113 are relatively clamped to the periphery of the support seat 121 to ensure the assembly stability of the support seat 121 on the motor bracket 110. The connecting arm 113 may specifically include a supporting arm connected to the top wall surface of the cylinder 111 and a clamping protrusion connected to the inner side of the top end of the supporting arm. When there are multiple connecting arms 113, the multiple supporting arms are clamped to the periphery of the support seat 121, and the multiple clamping protrusions are clamped to the support seat 121 to fix the support seat 121 to the top wall of the cylinder 111.

[0049] In one embodiment, please refer to Figures 1 to 6 The support seat 121 includes an upper support member 130 and a lower support member 140 that are fixedly connected, and a sealing ring groove 122 is formed between the upper support member 130 and the lower support member 140. An upper sealing surface 123 is formed on the upper support member 130, and a lower sealing surface 124 is formed on the lower support member 140; the connecting arm 113 is clamped on the top wall surface of the lower support member 140, and the upper support member 130 is provided with a avoidance notch 131 corresponding to the connecting arm 113.

[0050] In this embodiment, the upper support member 130 and the lower support member 140 can be fixedly connected by ultrasonic welding, bonding, etc. Since the overall size of the support seat 121 is small, and the shape of the sealing ring groove 122 is not suitable for direct demolding, that is, it cannot be demolded in a single direction, the support seat 121 is formed by connecting the upper support member 130 and the lower support member 140, which can reduce the process cost of forming the inner cavity of the support seat 121. At the same time, the upper support member 130 and the lower support member 140 are formed separately, which is also more convenient for the installation of the movable seal 150. The connecting arm 113 is clamped on the top wall surface of the lower support member 140, and a avoiding notch 131 is set on the upper support member 130 corresponding to the connecting arm 113. In this way, while ensuring the stable connection between the connecting arm 113 and the support seat 121, the connecting arm 113 is prevented from protruding from the top wall surface of the support seat 121, which is more conducive to the assembly of the remaining parts of the cleaning device, such as the outer seal 170.

[0051] In one embodiment, if Figures 4 to 7 As shown, the upper support member 130 includes a top plate 132 and an anti-rotation convex ring 133 arranged on the bottom wall of the top plate 132, and the lower support member 140 is in the shape of a tube with an open upper end, and a groove 141 is provided at the connection between the top wall and the inner circumferential wall of the lower support member 140; the top plate 132 covers the top wall of the lower support member 140, and the avoidance notch 131 is provided on the top plate 132, and the anti-rotation convex ring 133 is installed in the groove 141 at the axial upper limit position around the output shaft 200, and the inner circumferential wall of the lower support member 140 and the inner circumferential wall of the anti-rotation convex ring 133 jointly form the inner circumferential wall of the sealing ring groove 122.

[0052] In this embodiment, specifically, the anti-rotation protruding ring 133 can be designed to be non-circular, or the outer peripheral surface of the anti-rotation protruding ring 133 can include a flat portion, so that after the anti-rotation protruding ring 133 is matched with the embedding groove 141, the anti-rotation protruding ring 133 is prevented from rotating circumferentially around the output shaft 200 in the embedding groove 141, so that the upper support member 130 and the lower support member 140 are not prone to lateral and circumferential misalignment, which is conducive to improving the connection and fixing efficiency of the two. Optionally, the upper support member 130 and the lower support member 140 are both made of plastic material, and the lower end surface of the anti-rotation protruding ring 133 is ultrasonically welded to the inner wall surface of the embedding groove 141.

[0053] In one embodiment, please refer to Figure 1 , Figure 2 , Figures 5 to 7 The thickness of the top plate 132 is smaller than the axial height of the lower support member 140 in the output shaft 200; the top wall of the cylinder 111 is provided with a screw mounting hole 112, and the bottom wall of the lower support member 140 is provided with a screw avoidance space 142 corresponding to the screw mounting hole 112.

[0054] In this embodiment, since the connecting arm 113 is clamped on the top wall of the lower support member 140, a clearance notch 131 is provided on the top plate 132. By making the thickness of the top plate 132 smaller than the height of the lower support member 140, the clamping height of the lower support member 140 and the connecting arm 113 can be ensured, and the installation stability of the support seat 121 on the motor bracket 110 can be improved. The motor bracket 110 is fixedly connected to the motor body by screws. By providing a screw clearance space 142 on the bottom wall of the lower support member 140 corresponding to the screw installation hole 112, the assembly operation of the screw is more convenient.

[0055] In one embodiment, if Figure 4 , Figure 7 As shown, the sealing ring groove 122 has an upper sealing surface 123 and a lower sealing surface 124 which are opposite to each other in the axial direction of the output shaft 200, and the top wall surface and the bottom wall surface of the movable seal 150 are fixedly connected with a radial sealing portion 151, and the radial sealing portion 151 is sealed and rotatably matched with the upper sealing surface 123 and the lower sealing surface 124, and the outer peripheral wall of the movable seal 150 is spaced apart from the peripheral side wall of the sealing ring groove 122 to form an oil seal cavity 160 for filling with lubricating oil.

[0056] In this embodiment, the top wall and bottom wall of the movable seal 150 are fixedly connected with a radial sealing portion 151, so that double-layer radial waterproofing can be achieved between the movable seal 150 and the upper and lower sides of the sealing ring groove 122, further improving the waterproofing effect. Specifically, an annular protrusion is convexly provided on the top wall and bottom wall of the movable seal 150 to form the radial sealing portion 151. And through the cooperation between the radial sealing portion 151 on the top wall and bottom wall of the movable seal 150 and the sealing ring groove 122, a sealed oil seal cavity 160 can be formed between the outer peripheral wall of the movable seal 150 and the peripheral side wall of the sealing ring. In this way, a lubricating substance such as sealing oil can be filled in the oil seal cavity 160, which can not only reduce friction and thus reduce wear, but also improve the sealing effect by forming an additional oil seal interface.

[0057] In one embodiment, please refer to Figure 3 , Figure 4 and Figure 7 The waterproof component 100 of the output shaft 200 of the cleaning tool also includes an outer seal 170, and the outer seal 170 includes an inner sealing cylinder 171, an outer sealing cylinder 172 and a sealing sheet 173 connected between the inner sealing cylinder 171 and the outer sealing cylinder 172. The inner sealing cylinder 171 is used for sealing and is sleeved on the outside of the output shaft 200 for allowing the output shaft 200 to rotate. The outer sealing cylinder 172 is adapted to be mounted on the periphery of the support seat 121, and the top wall surface of the support seat 121 abuts against the bottom wall surface of the sealing sheet 173.

[0058] In this embodiment, the outer seal 170 is made of a flexible material such as rubber or silicone. The outer seal 170 is sandwiched between the housing of the cleaning tool and the output shaft 200. The outer sealing cylinder 172 of the outer seal 170 is fixedly connected to the housing of the cleaning tool, and the inner sealing cylinder 171 is in sealing contact with the output shaft 200, but does not affect the circumferential rotation of the output shaft 200. The output shaft 200 can be initially waterproofed by the outer seal 170. Since the output shaft 200 can rotate in the inner sealing cylinder 171 of the outer seal 170, water entering through the gap between the inner sealing cylinder 171 and the output shaft 200 can be blocked by the inner sealing structure 120, and then the entire output shaft 200 waterproof assembly 100 can effectively waterproof while ensuring that the output shaft 200 can rotate substantially in the circumferential direction. The top wall of the support seat 121 abuts against the bottom wall of the sealing sheet 173, and the support seat 121 can also support the outer seal 170, so that the sealing sheet 173 is clamped between the support seat 121 and the shell, thereby ensuring the sealing effect between the outer seal 170 and the shell. In addition, radial sealing is achieved by the cooperation of the flexible active seal 150 and the outer seal 170, and radial sealing is achieved by adding the cooperation of the hard support seat 121 and the active seal 150, which can effectively avoid deformation of the seal and sealing failure, and ensure the overall radial sealing effect.

[0059] The utility model also provides an electric toothbrush, such as Figure 7 and Figure 8 As shown, the electric toothbrush includes a brush head assembly, a brush handle housing 300, a motor and an output shaft 200 waterproof assembly 100 of the cleaning device. The specific structure of the output shaft 200 waterproof assembly 100 of the cleaning device refers to the above embodiment. The output shaft 200 waterproof assembly 100 is installed in the brush handle housing 300, and the motor body of the motor is installed in the motor body of the output shaft 200 waterproof assembly 100. The output shaft 200 of the motor extends out of the brush handle housing 300 through the output shaft 200 waterproof assembly 100 and is connected to the brush head assembly; since the electric toothbrush adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here. The brush handle housing 300 can provide support and protection for its internal parts, and can provide a gripping effect for the user. The motor body is used to provide a power source for the movement of the output shaft 200. In order to facilitate the replacement of the brush head assembly, the brush head assembly and the output shaft 200 are detachably connected.

[0060] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A waterproof assembly for an output shaft of a cleaning tool, characterized in that: It includes a motor bracket and an inner sealing structure; The inner sealing structure comprises a support seat for sleeved outside the output shaft and a movable sealing member for fixedly connected to the outer wall of the output shaft; The support seat is fixedly connected to the upper end of the motor bracket, and the inner peripheral wall of the support seat is provided with a sealing ring groove surrounding the output shaft; The movable seal can be installed in the sealing ring groove in a radially sealing manner along with the rotation of the output shaft.

2. The output shaft waterproof assembly of a cleaning tool according to claim 1, characterized in that: The support seat is detachably fixed to the upper end of the motor bracket.

3. The output shaft waterproof assembly of a cleaning tool according to claim 2, characterized in that: The motor bracket comprises a cylinder and a connecting portion fixedly connected to the top wall surface of the cylinder, and the support seat is fixed to the top wall of the cylinder through the connecting portion.

4. The output shaft waterproof assembly of a cleaning tool according to claim 3, characterized in that: The connecting portion comprises a connecting arm integrally formed on the top wall surface of the cylinder, and the connecting arm is detachably connected to the supporting seat.

5. The output shaft waterproof assembly of a cleaning tool according to claim 4, characterized in that: The top wall surface of the cylinder is provided with at least one pair of connecting arms which are opposite to each other in the axial direction of the output shaft, and a plurality of connecting arms are clamped on the periphery of the supporting seat.

6. The output shaft waterproof assembly of a cleaning tool according to claim 5, characterized in that: The support seat includes an upper support member and a lower support member that are fixedly connected, the upper support member and the lower support member enclose the sealing ring groove, the connecting arm is clamped on the top wall surface of the lower support member, and the upper support member is provided with a avoidance notch corresponding to the connecting arm.

7. The output shaft waterproof assembly of a cleaning tool according to claim 6, characterized in that: The upper support member includes a top plate and an anti-rotation convex ring arranged on the bottom wall of the top plate, the lower support member is in the shape of a tube with an open upper end, and a groove is provided at the connection between the top wall and the inner circumferential wall of the lower support member; the top plate covers the top wall of the lower support member, the avoidance notch is provided on the top plate, the anti-rotation convex ring is installed in the groove at the axial upper limit position around the output shaft, and the inner circumferential wall of the lower support member and the inner circumferential wall of the anti-rotation convex ring jointly form the inner circumferential wall of the sealing ring groove.

8. The output shaft waterproof assembly of a cleaning tool according to claim 7, characterized in that: The thickness of the top plate is smaller than the height of the lower support member in the axial direction of the output shaft; a screw mounting hole is provided on the top wall of the cylinder, and a screw avoidance space is provided on the bottom wall of the lower support member corresponding to the screw mounting hole.

9. The output shaft waterproof assembly of a cleaning tool according to any one of claims 1 to 8, characterized in that: The sealing ring groove has an upper sealing surface and a lower sealing surface which are opposite to each other in the axial direction of the output shaft. The top wall surface and the bottom wall surface of the movable seal are fixedly connected with a radial sealing portion. The radial sealing portion is sealed and rotatably matched with the upper sealing surface and the lower sealing surface. The outer peripheral wall of the movable seal is spaced apart from the peripheral side wall of the sealing ring groove to form an oil seal cavity for filling lubricating oil.

10. The output shaft waterproof assembly of a cleaning tool according to any one of claims 1 to 8, characterized in that: The output shaft waterproof assembly of the cleaning tool also includes an outer seal, which includes an inner sealing cylinder, an outer sealing cylinder and a sealing sheet connected between the inner sealing cylinder and the outer sealing cylinder. The inner sealing cylinder is used for sealing and is sleeved outside the output shaft so as to allow the output shaft to rotate. The outer sealing cylinder is adapted to be mounted on the periphery of the support seat, and the top wall of the support seat abuts against the bottom wall of the sealing sheet.

11. The output shaft waterproof assembly of a cleaning tool according to claim 1, characterized in that: The supporting seat is made of hard material, and the movable sealing element is made of flexible material.

12. An electric toothbrush, characterized in that: The cleaning tool comprises a brush head assembly, a brush handle shell, a motor and an output shaft waterproof assembly as claimed in any one of claims 1 to 10, wherein the output shaft waterproof assembly is installed in the brush handle shell, the motor body of the motor is installed in the motor body of the output shaft waterproof assembly, and the output shaft of the motor extends out of the brush handle shell through the output shaft waterproof assembly to be connected to the brush head assembly.

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