Brush handle device and electric toothbrush

Abstract

The embodiment of the utility model discloses a brush handle device and an electric toothbrush, and the brush handle device comprises a shell, an output shaft and a movable sealing piece; a via hole communicated with an inner cavity of the shell is formed in the upper end face of the shell; the upper end of the output shaft extends out of the shell through the via hole; the movable sealing piece is arranged corresponding to the via hole and located between the shell and the output shaft. The movable sealing piece comprises an inner cylinder part and an outer cylinder part arranged on the periphery of the inner cylinder part at intervals, one end of the inner cylinder part is connected with the outer cylinder part, and a first sealing ring is arranged on the inner circumferential wall of the other end of the inner cylinder part. The inner cylinder part is arranged on the periphery of the output shaft in a sleeving mode, the inner circumferential wall of the inner cylinder part and the output shaft are spaced to form a suspension space, and the first sealing ring is sealed and fixedly connected with the output shaft so that the inner cylinder part can rotate around the axis relative to the outer cylinder part along with the output shaft. The brush handle device can effectively guarantee the axial waterproof effect when the output shaft rotates in a large range.

Description

Technical Field

[0001] The present application relates to the technical field of electric toothbrushes, and in particular to a brush handle device and an electric toothbrush. Background Art

[0002] As the popularity of electric toothbrushes increases, users have higher functional requirements for electric toothbrushes. For example, users want to improve cleaning efficiency and cleaning effect, and traditional electric toothbrushes with micro-amplitude high-frequency vibration cleaning can no longer meet user needs.

[0003] In the past, electric toothbrushes rotated forward and reversed at a small angle to make the brush head vibrate, or were driven by a magnetic levitation motor to achieve brush head vibration. This working method has a small movement amplitude, so the wear on the seal is also small. In the related art, the electric toothbrush has been improved so that the electric toothbrush can rotate significantly around the axis of the output shaft to achieve a significant cleaning of the teeth. However, since the output shaft needs to rotate significantly around the axis, the current output shaft waterproof ring can no longer meet the waterproof requirements of the output shaft rotation, resulting in a short life of the output shaft waterproof ring and easy aging.

[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 a brush handle device, aiming to solve the technical problems that the waterproof structure of the output shaft that rotates greatly has a short life and is easy to age.

[0006] To achieve the above-mentioned purpose, the brush handle device proposed by the utility model includes a housing, an output shaft and a movable seal: wherein,

[0007] The upper end surface of the shell is provided with a through hole communicating with the inner cavity thereof;

[0008] The upper end of the output shaft extends out of the housing through the through hole;

[0009] A movable seal is arranged corresponding to the through hole and is located between the shell and the output shaft; the movable seal includes an inner cylinder part and an outer cylinder part arranged at a distance from the outer periphery of the inner cylinder part, one end of the inner cylinder part is connected to the outer cylinder part, and a first sealing ring is arranged on the inner circumferential wall of the other end; the inner cylinder part is sleeved on the outer periphery of the output shaft, and the inner circumferential wall of the inner cylinder part is spaced from the output shaft to form a suspension space, and the first sealing ring is sealed and fixedly connected to the output shaft, so that the inner cylinder part can rotate around its axis relative to the outer cylinder part with the output shaft.

[0010] In one embodiment, the distance between the inner circumferential wall of the inner cylinder portion and the outer circumferential wall of the output shaft is at least 0.2 mm; and / or the distance between the inner circumferential wall of the inner cylinder portion and the outer circumferential wall of the output shaft is smaller than the distance between the inner cylinder portion and the outer cylinder portion.

[0011] In one embodiment, the brush handle device further comprises a fixed seal sandwiched between the through hole of the shell and the output shaft, the fixed seal is located above the movable seal, and a shaft hole for the output shaft to rotate in a sealed manner is provided in the middle of the fixed seal.

[0012] In one embodiment, the fixed seal includes a cover plate and an inner sealing cylinder connected to the inner circumference of the cover plate, the middle part of the inner sealing cylinder forms the axial hole; the inner sealing cylinder is sealed and rotatably matched with the output shaft; the cover plate seals the gap between the inner circumferential wall of the through hole and the output shaft.

[0013] In one embodiment, a second sealing ring is protrudingly provided at the lower end of the inner circumferential wall of the inner sealing cylinder, and a thickened portion is provided on the outer circumferential wall of the inner sealing cylinder corresponding to the second sealing ring.

[0014] In one embodiment, the fixed sealing component also includes an outer sealing tube connected to the outer periphery of the cover plate; the upper end of the inner tube is fixedly connected to the upper end of the outer tube, and the outer sealing tube is sleeved on the outer periphery of the outer tube, and the outer peripheral wall of the outer sealing tube seals against the inner peripheral wall of the through hole.

[0015] In one embodiment, the movable seal also includes a flat gasket portion connected to the lower end of the outer peripheral wall of the outer tube portion; the fixed seal also includes a sealing sheet connected to the lower end of the outer peripheral wall of the outer sealing tube, and the sealing sheet is sealingly overlapped on the top wall of the flat gasket portion; the brush handle device also includes a driving unit arranged in the shell, and the driving unit is drivingly connected to the output shaft; the sealing sheet and the flat gasket sealing clamp are arranged between the inner wall surface of the shell and the driving unit.

[0016] In one embodiment, at least two opposite holding portions are provided on the outer periphery of the flat pad portion, and a plurality of the holding portions are relatively engaged with the outer periphery of the sealing sheet.

[0017] In one embodiment, in the axial direction of the output shaft, the length of the inner cylinder portion is greater than the length of the inner sealing cylinder.

[0018] In one embodiment, the movable sealing component and the fixed sealing component are integrally formed.

[0019] The utility model also provides an electric toothbrush, comprising a brush head assembly and a brush handle device as described in any of the above embodiments, wherein the output shaft of the brush handle device is connected to the brush head assembly.

[0020] The brush handle device of the utility model can minimize the friction contact area between the output shaft and the inner cylinder part by making the inner cylinder part and the outer cylinder part of the movable seal spaced from each other, the inner circumferential wall of the inner cylinder part and the outer circumferential wall of the output shaft spaced from each other to form a suspension space, and the output shaft is only sealed and fixedly connected to the inner cylinder part through the first sealing ring, so that the inner cylinder part can form an elastic cantilever relative to the outer cylinder part. Therefore, when the output shaft rotates, it can drive the free end of the inner cylinder part to twist relative to the outer cylinder part, effectively ensuring the axial waterproof effect when the output shaft rotates greatly; compared with the method in which the inner cylinder part does not move and the output shaft rotates in the inner cylinder part in a sealed manner, it can avoid the failure of axial waterproofing caused by friction and wear of silicone, slow down the aging rate of the sealing structure, and improve the service life of the movable seal. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] 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.

[0022] Figure 1 A structural schematic diagram of an embodiment of a brush handle device of the utility model is shown;

[0023] Figure 2 for Figure 1 A partial cross-sectional view of the middle brush handle device at one angle;

[0024] Figure 3 for Figure 1 A partial cross-sectional view of the middle brush handle device from another angle;

[0025] Figure 4 for Figure 3 A partial enlarged view of the middle A;

[0026] Figure 5 It is a schematic diagram of the assembly structure of a movable sealing member and a fixed sealing member according to an embodiment of the utility model;

[0027] Figure 6 for Figure 5 A cross-sectional view of the structure at one angle;

[0028] Figure 7 for Figure 5 Schematic diagram of the exploded structure of the movable seal and the fixed seal;

[0029] Figure 8 for Figure 7 A schematic diagram of the structure from another angle;

[0030] Fig. 9 for Figure 7A cross-sectional view of the structure at one angle.

[0031] Description of Figure Numbers:

[0032]

[0033]

[0034] 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

[0035] 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.

[0036] 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.

[0037] 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.

[0038] The utility model provides a brush handle device.

[0039] In the embodiment of the present utility model, please refer to Figures 1 to 4The brush handle device 100 includes a shell 110, an output shaft 130 and a movable seal 120: wherein the upper end surface of the shell 110 is provided with a through hole 111 communicating with the inner cavity thereof; the upper end of the output shaft 130 extends out of the shell 110 through the through hole 111; the movable seal 120 is arranged corresponding to the through hole 111 and is located between the shell 110 and the output shaft 130; the movable seal 120 includes an inner cylinder portion 121 and an outer cylinder portion 123 arranged at intervals on the outer periphery of the inner cylinder portion 121, one end of the inner cylinder portion 121 is connected to the outer cylinder portion 123, and the inner circumferential wall of the other end is provided with a first sealing ring 122; the inner cylinder portion 121 is sleeved on the outer periphery of the output shaft 130, the inner circumferential wall of the inner cylinder portion 121 is spaced from the output shaft 130 to form a suspension space, and the first sealing ring 122 is sealed and fixedly connected to the output shaft 130, so that the inner cylinder portion 121 can rotate around its axis relative to the outer cylinder portion 123 along with the output shaft 130.

[0040] In this embodiment, the shell 110 can be a single-layer shell structure or a double-layer shell structure, for example, the outer layer is a metal shell and the inner layer is a plastic shell. It can be selected and designed according to actual needs and is not specifically limited here. The shell 110 is cylindrical in shape extending in the up and down directions as a whole, so as to facilitate the user to hold it. In order to be more beautiful, the top of the shell 110 is usually designed to be dome-shaped. The brush handle device 100 also includes a drive unit 150 arranged in the shell 110, and the drive unit 150 is connected to the output shaft 130 in a transmission manner to drive the output shaft 130 to vibrate at a high frequency or rotate around its axis. The drive unit 150 can specifically be a motor assembly, and the output shaft 130 provides transmission and connection for external components such as a brush head assembly. The lower end of the output shaft 130 is placed in the cavity of the shell 110 and connected to the drive unit 150, and the upper end extends out of the shell 110 through the through hole 111 and is connected to an external component such as a brush head assembly.

[0041] The movable seal 120 is disposed between the housing 110 and the output shaft 130, and is disposed corresponding to the through hole 111. The movable seal 120 is used to seal the through hole 111 to prevent water from flowing into the drive unit 150 or other electrical components in the housing 110 from the gap between the inner circumferential wall of the through hole 111 of the housing 110 and the outer circumferential wall of the output shaft 130, causing the electrical structure in the brush handle housing 110 to fail. The movable seal 120 can be made of a flexible sealing material such as rubber or silicone. Specifically, the movable seal 120 can be designed to be pleated to form an inner cylinder 121 and an outer cylinder 123 that are connected to each other. One end of the inner cylinder 121 is connected to the outer cylinder 123, and the inner circumferential wall of the other end is provided with a first sealing ring 122, that is, the first sealing ring 122 is provided at the free end of the inner cylinder 121. In order to prevent water from accumulating in the annular groove between the inner cylinder 121 and the outer cylinder 123 and breeding bacteria, optionally, the upper end of the inner cylinder 121 is connected to the upper end of the outer cylinder 123, and a first sealing ring 122 is provided at the lower end of the inner cylinder 121. In other embodiments, the lower end of the inner cylinder 121 may be connected to the lower end of the outer cylinder 123, and a first sealing ring 122 may be provided at the upper end of the inner cylinder 121.

[0042] Specifically, the first sealing ring 122 and the output shaft 130 can be made to be interference fit and / or bonded, etc., to achieve a sealed fixed connection between the first sealing ring 122 and the output shaft 130. The outer cylinder portion 123 of the movable seal 120 can be fixed relative to the housing 110 by means of crimping, tight fitting, etc. In this way, when the output shaft 130 rotates, the free end of the inner cylinder portion 121 can be driven to rotate relative to the outer cylinder portion 123. The inner cylinder portion 121 and the output shaft 130 are axially sealed and waterproof through the first sealing ring 122, preventing water from entering the drive unit 150 through the gap between the inner circumferential wall of the inner cylinder portion 121 and the outer circumferential wall of the output shaft 130.

[0043] The brush handle device 100 of the utility model can minimize the friction contact area between the output shaft 130 and the inner cylinder 121 by making the inner cylinder 121 and the outer cylinder 123 of the movable seal 120 spaced apart from each other, and the inner circumferential wall of the inner cylinder 121 is spaced apart from the outer circumferential wall of the output shaft 130 to form a suspension space. The output shaft 130 is sealed and fixedly connected with the inner cylinder 121 only through the first sealing ring 122, so that the inner cylinder 121 can form an elastic cantilever relative to the outer cylinder 123. Therefore, when the output shaft 130 rotates, it can drive the free end of the inner cylinder 121 to twist relative to the outer cylinder 123, effectively ensuring the axial waterproof effect when the output shaft 130 rotates significantly; compared with the method in which the inner cylinder 121 does not move and the output shaft 130 rotates in the inner cylinder 121 in a sealed manner, it can avoid the failure of axial waterproofing caused by friction and wear of silicone, slow down the aging rate of the sealing structure, and improve the service life of the movable seal 120.

[0044] In one embodiment, if Figures 2 to 4As shown, the distance between the inner circumferential wall of the inner cylinder portion 121 and the outer circumferential wall of the output shaft 130 is at least 0.2 mm; and / or, the distance between the inner circumferential wall of the inner cylinder portion 121 and the outer circumferential wall of the output shaft 130 is smaller than the distance between the inner cylinder portion 121 and the outer cylinder portion 123.

[0045] In this embodiment, since the output shaft 130 will vibrate slightly and at a high frequency when in use, if the spacing between the inner circumferential wall of the inner cylinder 121 and the outer circumferential wall of the output shaft 130 is less than 0.2 mm, the spacing of the suspension space is too small, and the output shaft 130 will inevitably contact the inner wall surface of the inner cylinder 121, which will increase the torsional resistance of the inner cylinder 121, on the one hand, making the connection between the inner cylinder 121 and the outer cylinder 123 easy to break, and on the other hand, affecting the large rotation of the output shaft 130. By making the spacing between the inner circumferential wall of the inner cylinder 121 and the outer circumferential wall of the output shaft 130 at least 0.2 mm, the suspension space between the inner cylinder 121 and the output shaft 130 is sufficient, ensuring that the inner cylinder 121 can form a cantilever when the output shaft 130 is working, that is, the free end of the inner cylinder 121 can be twisted relative to the outer cylinder 123 with the output shaft 130, effectively ensuring the axial waterproof effect when the output shaft 130 rotates greatly.

[0046] It is understandable that the purpose of the spacing between the outer circumferential wall of the inner cylinder 121 and the inner circumferential wall of the outer cylinder 123 is to provide sufficient activity space for the torsion of the inner cylinder 121, and the purpose of the spacing between the inner circumferential wall of the inner cylinder 121 and the outer circumferential wall of the output shaft 130 is to enable the inner cylinder 121 to form an elastic cantilever relative to the output shaft 130 and the outer cylinder 123. If the spacing between the inner circumferential wall of the inner cylinder 121 and the outer circumferential wall of the output shaft 130 is too large, on the one hand, it will make the suspension space easy to accumulate water and breed bacteria, and on the other hand, the excessive spacing will occupy the lateral space. By making the spacing between the inner circumferential wall of the inner cylinder 121 and the outer circumferential wall of the output shaft 130 smaller than the spacing between the inner cylinder 121 and the outer cylinder 123, while ensuring that the inner cylinder 121 can form an elastic cantilever, the overall structure is made more compact.

[0047] In one embodiment, please refer to Figures 1 to 4 The brush handle device 100 further includes a fixed seal 140 sandwiched between the through hole 111 of the housing 110 and the output shaft 130. The fixed seal 140 is located above the movable seal 120. A shaft hole 141 is provided in the middle of the fixed seal 140 for the output shaft 130 to rotate in a sealed manner.

[0048] In this embodiment, the fixed seal 140 can be made of flexible sealing materials such as rubber and silicone. Specifically, the fixed seal 140 is fixedly connected to the housing 110, and an axial hole 141 is set in the middle of the fixed seal 140. When working, the fixed seal 140 is immovable relative to the housing 110, the inner peripheral wall of the axial hole 141 is sealed with the output shaft 130, and the output shaft 130 can rotate in the axial hole 141. By arranging the fixed seal 140 above the movable seal 120, the fixed seal 140 can perform preliminary axial waterproofing on the output shaft 130, and the output shaft 130 can be secondary axial waterproofing through the movable seal 120, which can effectively improve the waterproof effect. It can be understood that the fixed seal 140 and the movable seal 120 in this embodiment can be two independently formed parts, or they can be integrally formed parts. When the fixed seal 140 and the movable seal 120 are independently formed, the manufacturing difficulty can be reduced, thereby reducing the manufacturing cost.

[0049] In other embodiments, the movable seal 120 is integrally formed with the fixed seal 140. In combination with the following embodiment in which the movable seal 120 has an outer cylinder portion 123 and a flat pad portion 124, and the fixed seal 140 has an outer sealing cylinder 146 and a sealing sheet 147, specifically, the outer sealing cylinder 146 of the fixed seal 140 is integrally formed with the outer cylinder portion 123 of the movable seal 120, and the sealing sheet of the fixed seal 140 is integrally formed with the flat pad portion 124 of the movable seal 120. The inner sealing cylinder 143 and the inner cylinder portion 121 are suspended and independent relative to the entire seal. By making the movable seal 120 and the fixed seal 140, the assembly steps can be simplified and the overall sealing effect can be improved.

[0050] In one embodiment, if Figures 2 to 6 As shown, the fixed seal 140 includes a cover plate 142 and an inner sealing cylinder 143 connected to the inner circumference of the cover plate 142, and an axial hole 141 is formed in the middle of the inner sealing cylinder 143; the inner sealing cylinder 143 is sealed and rotatably matched with the output shaft 130; the cover plate 142 seals the gap between the inner circumferential wall of the through hole 111 and the output shaft 130.

[0051] In this embodiment, the cover plate 142 of the fixed seal 140 covers the gap between the inner circumferential wall of the through hole 111 and the output shaft 130, so as to shield the movable seal 120, which plays a preliminary role of blocking water on the one hand, and prevents the inner cylinder 121 and the outer cylinder 123 of the movable seal 120 from being exposed, thereby ensuring the appearance consistency of the brush handle device 100. The fixed seal 140 is sleeved on the outside of the output shaft 130 through the inner sealing cylinder 143, which can increase the sealing area between the fixed seal 140 and the output shaft 130 without affecting the high-frequency vibration of the output shaft 130, thereby improving the sealing effect of the fixed seal 140.

[0052] In one embodiment, please refer to Figure 4 , Figure 6 and Fig. 9 The lower end of the inner peripheral wall of the inner sealing cylinder 143 is provided with a second sealing ring 144, and the outer peripheral wall of the inner sealing cylinder 143 is provided with a thickened portion 145 corresponding to the second sealing ring 144. The second sealing ring 144 is sealed and rotatably matched with the output shaft 130. By providing the thickened portion 145 on the outer peripheral wall of the inner sealing cylinder 143 corresponding to the second sealing ring 144, the second sealing ring 144 can be supported, so that the second sealing ring 144 can be tightly sleeved on the outer periphery of the output shaft 130 to ensure the axial waterproof effect. Specifically, the thickened portion 145 is a thickened annular rib surrounding the outer periphery of the inner sealing cylinder 143.

[0053] In one embodiment, if Figures 2 to 6 As shown, the fixed seal 140 also includes an outer sealing cylinder 146 connected to the outer periphery of the cover plate 142; the upper end of the inner cylinder 121 is fixedly connected to the upper end of the outer cylinder 123, the outer sealing cylinder 146 is sleeved on the periphery of the outer cylinder 123, and the outer peripheral wall of the outer sealing cylinder 146 is sealed against the inner peripheral wall of the through hole 111. By making the upper end of the inner cylinder 121 fixedly connected to the upper end of the outer cylinder 123, compared with the way that the lower ends of the two are fixed, it is possible to avoid the water in the suspension space upwards to breed bacteria. Specifically, a third sealing ring can be provided on the outer peripheral wall of the outer sealing cylinder 146 to ensure the seal between the outer sealing cylinder 146 and the inner peripheral wall of the through hole 111. By making the outer sealing cylinder 146 sleeved on the periphery of the outer cylinder 123, the outer cylinder 123 can be fixed and supported, and the installation stability of the movable seal 120 can be improved.

[0054] In one embodiment, please refer to Figures 2 to 9 The movable seal 120 also includes a flat pad 124 connected to the lower end of the outer peripheral wall of the outer tube 123; the fixed seal 140 also includes a sealing sheet 147 connected to the lower end of the outer peripheral wall of the outer sealing tube 146, and the sealing sheet 147 is sealingly overlapped on the top wall of the flat pad 124; the brush handle device 100 also includes a driving unit 150 arranged in the shell 110, and the driving unit 150 is transmission-connected to the output shaft 130; the sealing sheet 147 and the flat pad 124 are sealingly clamped between the inner wall surface of the shell 110 and the driving unit 150.

[0055] In this embodiment, the drive unit 150 may specifically be a motor unit. The sealing sheet 147 and the flat gasket 124 are sealingly sandwiched between the housing 110 and the drive unit 150. When the motor unit has a motor bracket, the sealing sheet 147 and the flat gasket 124 are specifically sandwiched between the housing 110 and the top of the motor bracket. When the motor unit is not provided with a motor bracket, the sealing sheet 147 and the flat gasket 124 are specifically sandwiched between the housing 110 and the top of the motor shell. Specifically, a fourth sealing ring may be provided on the top wall of the flat gasket 124 to achieve a sealed overlap between the sealing sheet 147 and the flat gasket 124. A fifth sealing ring is provided on the top wall of the sealing sheet 147 to achieve a sealed contact between the sealing sheet 147 and the inner wall surface of the housing 110. By providing the flat washer 124 and the sealing sheet 147, the flat washer 124 and the sealing sheet 147 are clamped between the inner wall surface of the shell 110 and the top of the driving unit 150. There is no need to additionally provide a connecting structure to fix the movable seal 120 and the fixed seal 140. This can simplify the fixed installation structure of the movable seal 120 and the fixed seal 140 relative to the shell 110 and improve the installation efficiency.

[0056] In one embodiment, if Figures 3 to 9 As shown, at least two opposite clamping parts 125 are provided on the periphery of the flat pad part 124, and the plurality of clamping parts 125 are relatively clamped on the periphery of the sealing sheet 147. By providing the clamping parts 125, it is more convenient to position and install the fixed sealing member 140 relative to the movable sealing member 120, so that the connection between the two is more stable and reliable.

[0057] In one embodiment, please refer to Figure 4 , Figure 6 and Fig. 9 In the axial direction of the output shaft 130, the length of the inner cylinder 121 is greater than the length of the inner sealing cylinder 143. The longer inner cylinder 121 is more conducive to the twisting of the free end of the inner cylinder 121 relative to the outer cylinder 123. It can be understood that the inner sealing cylinder 143 is located above the inner cylinder 121. The shorter inner sealing cylinder 143 can shorten the length of the entire fixed seal 140. By making the length of the inner cylinder 121 greater than the length of the inner sealing cylinder 143, while being more conducive to the free end of the inner cylinder 121 rotating significantly with the rotating shaft, the sealing structure of the output shaft 130 can be made more compact as a whole and reduce the occupied space.

[0058] The utility model also proposes an electric toothbrush, which includes a brush head assembly and a brush handle device 100. The specific structure of the brush handle device 100 refers to the above embodiment, and the output shaft 130 of the brush handle device 100 is connected to the brush head assembly; since the electric toothbrush adopts all the technical solutions of all the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here. The specific structure of the brush head assembly can refer to the existing design and is not specifically limited here. In order to facilitate the replacement of the brush head assembly, the brush head assembly is usually detachably connected to the output shaft 130. The output shaft 130 of the brush handle device 100 drives the brush head assembly to rotate significantly around the axis to simulate the human hand swinging up and down on the teeth to brush the teeth.

[0059] 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 brush handle device, characterized in that: include: A shell, wherein the upper end surface of the shell is provided with a through hole communicating with the inner cavity thereof; An output shaft, the upper end of which extends out of the housing through the through hole; as well as A movable seal is arranged corresponding to the through hole and is located between the shell and the output shaft; the movable seal includes an inner cylinder part and an outer cylinder part arranged at a distance from the outer periphery of the inner cylinder part, one end of the inner cylinder part is connected to the outer cylinder part, and the inner circumferential wall of the other end is provided with a first sealing ring; the inner cylinder part is sleeved on the outer periphery of the output shaft, the inner circumferential wall of the inner cylinder part is spaced from the output shaft to form a suspension space, and the first sealing ring is sealed and fixedly connected to the output shaft, so that the inner cylinder part can rotate around its axis relative to the outer cylinder part along with the output shaft.

2. The brush handle device according to claim 1, characterized in that: The distance between the inner circumferential wall of the inner cylinder and the outer circumferential wall of the output shaft is at least 0.2 mm; and / or the distance between the inner circumferential wall of the inner cylinder and the outer circumferential wall of the output shaft is smaller than the distance between the inner cylinder and the outer cylinder.

3. The brush handle device according to claim 1 or 2, characterized in that: The brush handle device also includes a fixed seal sandwiched between the through hole of the shell and the output shaft, the fixed seal is located above the movable seal, and a shaft hole for the output shaft to rotate in a sealed manner is provided in the middle of the fixed seal.

4. The brush handle device according to claim 3, characterized in that: The fixed seal comprises a cover plate and an inner sealing cylinder connected to the inner circumference of the cover plate, the middle part of the inner sealing cylinder forms the axial hole; the inner sealing cylinder is sealed and rotatably matched with the output shaft; the cover plate seals the gap between the inner circumferential wall of the through hole and the output shaft.

5. The brush handle device according to claim 4, characterized in that: A second sealing ring is protrudingly provided at the lower end of the inner peripheral wall of the inner sealing cylinder, and a thickened portion is provided on the outer peripheral wall of the inner sealing cylinder corresponding to the second sealing ring.

6. The brush handle device according to claim 4, characterized in that: The fixed seal also includes an outer sealing tube connected to the outer periphery of the cover plate; the upper end of the inner tube is fixedly connected to the upper end of the outer tube, the outer sealing tube is sleeved on the outer periphery of the outer tube, and the outer peripheral wall of the outer sealing tube seals against the inner peripheral wall of the through hole.

7. The brush handle device according to claim 6, characterized in that: The movable seal also includes a flat gasket connected to the lower end of the outer peripheral wall of the outer tube; the fixed seal also includes a sealing sheet connected to the lower end of the outer peripheral wall of the outer sealing tube, and the sealing sheet is sealingly overlapped on the top wall of the flat gasket; the brush handle device also includes a driving unit arranged in the shell, and the driving unit is drivingly connected to the output shaft; the sealing sheet and the flat gasket sealing clamp are arranged between the inner wall surface of the shell and the driving unit.

8. The brush handle device according to claim 7, characterized in that: At least two opposite clamping parts are arranged on the outer periphery of the flat pad part, and a plurality of the clamping parts are relatively clamped on the outer periphery of the sealing sheet.

9. The brush handle device according to claim 4, characterized in that: In the axial direction of the output shaft, the length of the inner cylinder portion is greater than the length of the inner sealing cylinder.

10. The brush handle device according to claim 3, characterized in that: The movable sealing component and the fixed sealing component are integrally formed.

11. An electric toothbrush, characterized in that: The invention comprises a brush head assembly and a brush handle device as claimed in any one of claims 1 to 10, wherein an output shaft of the brush handle device is connected to the brush head assembly.

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