Brush handle and electric toothbrush

Abstract

The utility model discloses a brush handle and an electric toothbrush, and the brush handle comprises a handle shell which is provided with a containing cavity and a shaft hole; the machine core is arranged in the containing cavity and comprises a driving assembly, the driving assembly is provided with an output shaft and can drive the output shaft to move, and a first gap is defined between the part, located in the shaft hole, of the output shaft and the hole wall of the shaft hole; at least part of the elastic sealing piece is located in the first gap, the elastic sealing piece comprises a sleeving part, a deformation part and a sealing part which are connected in sequence, the sleeving part is connected with the output shaft in a sleeving mode, and the sealing part is clamped between the inner wall of the handle shell and the machine core; the first limiting piece is arranged in the accommodating cavity and is arranged on at least one of the handle shell and the movement; the second limiting piece is installed on the output shaft and matched with the first limiting piece in a limiting mode so as to limit the motion stroke of the output shaft in the axial direction and / or the circumferential direction of the output shaft, it can be ensured that the output shaft only does reciprocating motion within the preset range, and the sealing stability of the sealing piece is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of oral cleaning, and particularly relates to a brush handle and an electric toothbrush. Background Art

[0002] Nowadays, electric toothbrushes are becoming more and more popular. The brush handle of an electric toothbrush drives the brush head to move through a drive shaft. The moving brush head contacts the teeth or gums of a user, thereby cleaning the user's oral cavity.

[0003] Wherein, one end of the housing of the brush handle is provided with an opening, and the drive shaft is exposed at the opening and reciprocates. In order to prevent water from entering the interior of the housing through the opening during the use of the electric toothbrush, a sealing member is provided between the drive shaft and the inner wall of the housing in the related art. However, it is difficult to ensure the movement stroke of the drive shaft during the swinging process. If the rotation angle of the drive shaft exceeds a preset range, it is easy to affect the sealing effect of the sealing member. Summary of the Utility Model

[0004] The embodiments of the present application provide a brush handle and an electric toothbrush, which can ensure that the output shaft reciprocates only within a preset range, and improve the sealing stability of the sealing member.

[0005] In a first aspect, the embodiments of the present application provide a brush handle, including:

[0006] A handle housing having a receiving cavity and a shaft hole communicating with the receiving cavity;

[0007] A movement mechanism disposed in the receiving cavity. The movement mechanism includes a drive assembly having an output shaft. The drive assembly can drive the output shaft to move. The output shaft passes through the shaft hole and extends out of the handle housing. A first gap is defined between a portion of the output shaft located in the shaft hole and the hole wall of the shaft hole;

[0008] An elastic sealing member, at least a part of the elastic sealing member is located in the first gap. The elastic sealing member includes a sleeved portion, a deformed portion and a sealing portion connected in sequence. The sleeved portion is sleeved on the output shaft. The sealing portion is clamped between the inner wall of the handle housing and the movement mechanism. At least the deformed portion can generate elastic deformation to provide a deformation allowance when the output shaft moves;

[0009] A first limiting member, installed in the receiving cavity and installed on at least one of the handle housing and the movement mechanism; and

[0010] A second limiting member, installed on the output shaft and in limiting cooperation with the first limiting member to define the movement stroke of the output shaft in the axial direction and / or the circumferential direction of the output shaft during the movement of the output shaft.

[0011] In some embodiments, the first limiting member is provided with a limiting groove, and the second limiting member is limited by the limiting groove during the movement following the output shaft.

[0012] In some embodiments, the limiting groove includes two first limiting portions oppositely arranged in the circumferential direction, and the two first limiting portions define a groove body in a sector structure. The second limiting member swings back and forth in the groove body during the circumferential movement following the output shaft;

[0013] And / or, the limiting groove includes two second limiting portions spaced apart in the axial direction, and the second limiting member is limited by the second limiting portion during the axial movement following the output shaft.

[0014] In some embodiments, the driving assembly can drive the output shaft to swing back and forth around its own axis, and the first limiting member and the second limiting member jointly define that the angle of the output shaft swinging back and forth around its own axis is α, where 1.5° ≤ α ≤ 75°.

[0015] In some embodiments, the movement mechanism further includes:

[0016] A mounting bracket, which is disposed in the accommodating cavity. The sealing portion is clamped between the inner wall of the handle housing and the mounting bracket. The driving assembly is connected to the mounting bracket. One end of the mounting bracket close to the shaft hole has a through hole, and the output shaft sequentially passes through the through hole and the shaft hole;

[0017] Wherein, the limiting member is connected to the mounting bracket.

[0018] In some embodiments, a second gap is formed between the outer surface of one end of the mounting bracket close to the shaft hole and the inner wall of the accommodating cavity, and the sealing portion is filled in the second gap.

[0019] In some embodiments, the driving assembly includes a stator and a rotor, and the rotor includes the output shaft;

[0020] Wherein, the limiting member is connected to the stator.

[0021] In some embodiments, the driving assembly further includes:

[0022] A bearing, which is located between the stator and the rotor, and the output shaft passes through the bearing; and

[0023] An elastic member, and the bearing and the stator are connected by the elastic member.

[0024] In some embodiments, the deformation part includes a pleated structure surrounding the output shaft, and the pleated structure can expand and contract axially along the output shaft and can twist around the axis of the output shaft;

[0025] Wherein, the pleated structure is arranged to extend axially along the output shaft, or the pleated structure is arranged to extend radially along the output shaft and the pleated part is located at the orifice of the shaft hole.

[0026] In some embodiments, the pleated structure includes a plurality of pleated parts, and the plurality of pleated parts are sequentially connected axially along the output shaft, or the plurality of pleated parts are sequentially connected radially with respect to the output shaft.

[0027] In some embodiments, the pleated structure includes a bulged part, the bulged part is exposed outside the shaft hole, and the surface of the bulged part exposed outside the shaft hole bulges towards the outside of the shaft hole.

[0028] In some embodiments, the deformation part includes

[0029] a deformation part that extends radially along the output shaft and is connected to the socket part; and

[0030] an extension part that is connected to the deformation part and extends axially along the output shaft, and one side of the extension part away from the deformation part is connected to the sealing part;

[0031] Wherein, the outer wall surface of the extension part abuts against the inner wall of the shaft hole, and the extension part extends into the accommodation cavity from the deformation part.

[0032] In some embodiments, the movement mechanism further includes:

[0033] a mounting bracket disposed in the accommodation cavity, the sealing part is clamped between the inner wall of the handle housing and the mounting bracket, the driving assembly is connected to the mounting bracket, one end of the mounting bracket close to the shaft hole has a through hole, and the output shaft sequentially passes through the through hole and the shaft hole;

[0034] Wherein, the aperture of the through hole is smaller than the outer diameter of the extension part.

[0035] In some embodiments, the radial dimension of the deformation part is greater than 2 mm.

[0036] In some embodiments, the handle housing includes;

[0037] a housing part provided with the accommodation cavity and the shaft hole; and

[0038] An extension plate is connected to one end of the housing part having the shaft hole and extends into the accommodation cavity. The extension plate forms a part of the hole wall of the shaft hole. A stepped structure is provided at the free end of the extension plate, and the sealing part is clamped between the stepped structure and the movement mechanism.

[0039] In some embodiments, the movement mechanism further includes:

[0040] A mounting bracket, which is mounted in the accommodation cavity and is used for mounting the driving assembly; and

[0041] A limiting plate is connected to one end of the mounting bracket close to the shaft hole. The limiting plate extends into the socket part and the extension part. When the elastic seal moves with the output shaft, there is always a gap between the top of the limiting plate and the deformed part. The limiting plate is used to limit the deformation amplitude of the extension part, the deformed part and the first socket part during the movement of the elastic seal with the output shaft.

[0042] In some embodiments, the socket part includes:

[0043] A first socket part, which is connected to the deformed part; and

[0044] A second socket part, which is connected to the side of the deformed part away from the first socket part. The second socket part is in interference fit with the output shaft or is fixedly connected to the output shaft through a restraint to move with the output shaft. During the movement of the second socket part with the output shaft, the first socket part can undergo partial elastic deformation.

[0045] In some embodiments, the first socket part includes:

[0046] A fitting part, which is connected to the deformed part; and

[0047] A connecting part, with the opposite sides of the connecting part respectively connecting the fitting part and the second socket part. The fitting part is in contact with the outer wall of the output shaft, and there is an air gap between the connecting part and the outer wall of the output shaft.

[0048] In some embodiments, the connecting part is provided with folds; or grooves are provided on the outer wall surface of the connecting part; or the connecting part is arched away from the output shaft.

[0049] In a second aspect, an embodiment of the present application provides an electric toothbrush, which includes:

[0050] A toothbrush handle as described above; and

[0051] A toothbrush head, which is detachably connected to the part of the output shaft outside the accommodation cavity.

[0052] For the brush handle and electric toothbrush according to the embodiments of the present application, in the accommodation cavity of the embodiments of the present application, a limiting member is installed, and the limiting member is fixedly connected to at least one of the handle shell and the movement mechanism, so as to be relatively fixed in the accommodation cavity. During the movement of the output shaft, the limiting member limits the movement stroke of the output shaft, and the movement stroke includes the movement stroke of the output shaft in the axial direction; the movement stroke of the output shaft in the circumferential direction; or the movement stroke of the output shaft limited in the axial and circumferential directions, so as to ensure that the output shaft only reciprocates within a preset range, improving the cleaning effect of the toothbrush and the user experience. In the embodiments of the present application, an elastic seal is used to seal the shaft hole, and by providing a deformation part, various movements of the output shaft are supported, and moreover, pulling on the seal part can be avoided, ensuring both the sealing and waterproof effect and the smooth movement of the output shaft, and also extending the service life of the present application. Description of the Drawings

[0053] In order to more clearly illustrate the technical solutions in the embodiments of the present application 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 drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0054] Figure 1 Structural schematic diagram of the electric toothbrush provided by the embodiments of the present application;

[0055] Figure 2 Structural schematic diagram of the brush handle provided by the embodiments of the present application;

[0056] Figure 3 Partial cross-sectional schematic diagram of the brush handle provided by the embodiments of the present application;

[0057] Figure 4 Partial cross-sectional schematic diagram of the brush handle provided by the embodiments of the present application;

[0058] Figure 5 For Figure 4 Enlarged schematic diagram of part A in

[0059] Figure 6 Partial cross-sectional schematic diagram of the brush handle provided by the embodiments of the present application (omitting the handle shell);

[0060] Figure 7 For Figure 6 Enlarged schematic diagram of part B in

[0061] Figure 8 Structural schematic diagram of the elastic seal provided by the embodiments of the present application.

[0062] Explanation of the reference numerals in the drawings:

[0063] 1. Electric toothbrush; 10. Brush handle; 100. Handle shell; 100a. Accommodation cavity; 100b. Shaft hole; 100c. First gap; 100d. Second gap; 110. Housing part; 120. Extension plate; 121. Step structure; 200. Movement; 210. Driving assembly; 211. Motor assembly; 2111. First motor; 2112. Second motor; 212. Output shaft; 220. Mounting bracket; 220a. Through hole; 230. Limiting plate; 250. Battery; 300. Elastic seal; 310. Socket part; 310a. Air gap; 311. First sleeve part; 3111. Fitting part; 3112. Connecting part; 312. Second sleeve part; 320. Deformation part; 321. Deformed part; 322. Extension part; 323. Fold structure; 330. Sealing part; 400. First limiting member; 410. Limiting groove; 411. First limiting part; 412. Second limiting part; 500. Second limiting member; 20. Brush head.

[0064] The realization, functional features and advantages of the purpose of the present utility model will be further described with reference to the embodiments and the accompanying drawings. Specific embodiments

[0065] To make the purpose, technical solutions and advantages of the present utility model clearer, the following will further describe the embodiments of the present application in detail with reference to the accompanying drawings.

[0066] When the following description relates to the accompanying drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present utility model. On the contrary, they are merely examples of devices and methods consistent with some aspects of the present utility model as detailed in the appended claims.

[0067] In the description of the present utility model, it should be understood that the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances. In addition, in the description of the present utility model, unless otherwise specified, "a plurality" means two or more. "And / or" describes the association relationship of associated objects and indicates that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. The character " / " generally represents an "or" relationship between the associated objects before and after.

[0068] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this utility model belongs. The terms used in the description of this specification are only for the purpose of describing specific embodiments and are not intended to limit this utility model. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0069] Please refer to Figure 1 , an embodiment of the present application provides an electric toothbrush 1, and the electric toothbrush 1 includes a brush handle 10 and a brush head 20. Please refer to Figure 2 and Figure 3 , the brush handle 10 includes a handle shell 100 and a movement 200 disposed within the handle shell 100. The movement 200 includes components such as a mounting bracket 220, a circuit board, a battery 250, and a drive assembly 210.

[0070] For the convenience of the user's grip, the handle shell 100 may be optionally in the shape of a slender tube and has a length direction and a width direction that are perpendicular to each other. The main structure of the handle shell 100 may be made of plastic material. For example, suitable exemplary materials that can be used include, but are not limited to, hard plastics such as polyethylene, polypropylene (PP), polyamide, polyester, fibrous, SAN, acrylic resin, ABS, and other thermoplastics suitable for manufacturing the handle shell 100. Of course, the main structure of the handle shell 100 may also be made of metal material, such as aluminum alloy, and the present application does not make any limitation thereto.

[0071] The handle shell 100 is provided with a receiving cavity 100a, and a shaft hole 100b communicating with the receiving cavity 100a is provided at one end of the handle shell 100. Components such as the mounting bracket 220, the circuit board, the battery 250, the drive assembly 210, and the elastic seal 300 are all at least partially disposed within the receiving cavity 100a. Among them, the circuit board is disposed on one surface of the mounting bracket 220. Along the length direction of the handle shell 100, two mounting chambers are formed within the mounting bracket 220. The drive assembly 210 is located in the mounting chamber of the mounting bracket 220 close to the shaft hole 100b, and the battery 250 is located in the mounting chamber of the mounting bracket 220 far from the shaft hole 100b, and the two mounting chambers can communicate with each other.

[0072] The battery 250 may be a rechargeable battery 250 (such as a lithium battery 250) or other forms such as a dry battery 250, and is used to supply power to electrical components such as the circuit board. The circuit board is electrically connected to the drive assembly 210 and is used to control the operation of the drive assembly 210. A through hole 220a communicating with the mounting chamber where the drive assembly 210 is located is provided at one end of the mounting bracket 220 close to the shaft hole 100b. The drive assembly 210 includes a motor assembly 211 and an output shaft 212. The motor assembly 211 is connected to the output shaft 212. The output shaft 212 passes through the through hole 220a and the shaft hole 100b and partially extends outside the handle shell 100.

[0073] The output shaft 212 can be actuated under the drive of the motor assembly 211. Among them, the movement of the output shaft 212 can include one or both of reciprocating rotation about its own axis and telescopic movement along its own axis. In the embodiment of the present application, the motor assembly 211 includes a first motor 2111 and a second motor 2112 arranged along the length direction of the handle housing 100, and both the first motor 2111 and the second motor 2112 are connected to the output shaft 212. Among them, the first motor 2111 can drive the output shaft 212 to reciprocate rotation about its own axis, and the second motor 2112 can drive the output shaft 212 to perform telescopic movement along its own axis. It can be understood that when only one kind of movement is required for the output shaft 212, only one corresponding motor can be provided.

[0074] The brush head 20 is connected to the portion of the output shaft 212 outside the handle housing 100, so that it can vibrate under the drive of the output shaft 212. The brush head 20 is provided with bristles, and the vibration of the brush head 20 enables the bristles to clean the user's oral cavity. During the use of the electric toothbrush 1, only the first motor 2111 can operate to make the brush head 20 reciprocate rotation about the axis of the output shaft 212; or only the second motor 2112 can operate to make the brush head 20 perform telescopic movement along the axis of the output shaft 212; of course, the first motor 2111 and the second motor 2112 can also operate simultaneously, so that the brush head 20 performs the above two kinds of movements at the same time.

[0075] In some embodiments, the brush head 20 is detachably assembled with the output shaft 212. For example, the brush head 20 has a socket hole that is inserted and matched with the output shaft 212. The output shaft 212 is provided with a first positioning structure, and the hole wall of the socket hole is provided with a second positioning structure. The first positioning structure and the second positioning structure cooperate to define the installation direction of the brush head 20. The first positioning structure can be a protrusion, and the second positioning structure can be a groove that cooperates with the protrusion.

[0076] During the use of the electric toothbrush 1, the output shaft 212 will reciprocate rotation about its own axis and / or perform telescopic movement along its own axis. However, it is difficult to ensure its movement stroke during the swinging process of the output shaft 212. Therefore, please refer to Figure 6 and Figure 7, in the present application, a first limiting member 400 and a second limiting member 500 are provided. The first limiting member 400 is installed in the accommodation cavity 100a and is fixedly connected to at least one of the handle housing 100 and the movement mechanism 200 to be relatively fixed in the accommodation cavity 100a. The second limiting member 500 is installed on the output shaft 212. During the movement of the output shaft 212, the second limiting member 500 and the first limiting member 400 are in limiting cooperation to limit the movement stroke of the output shaft 212 in the axial direction of the output shaft 212; or limit the movement stroke of the output shaft 212 in the circumferential direction; or limit the movement stroke of the output shaft 212 in both the axial and circumferential directions, so as to ensure that the output shaft 212 only reciprocates within a preset range, improving the user experience.

[0077] Please refer to Figure 6 and Figure 7 , the first limiting member 400 is provided with a limiting groove 410, and the second limiting member 500 is limited by the limiting groove 410 during the movement following the output shaft 212. In some embodiments, the limiting groove 410 includes two first limiting portions 411 oppositely arranged in the circumferential direction. The two first limiting portions 411 limit a fan-shaped groove body, and the second limiting member 500 reciprocates within the groove body during the circumferential movement following the output shaft 212; in still other embodiments, the limiting groove 410 includes two second limiting portions 412 spaced apart in the axial direction, and the second limiting member 500 is limited by the second limiting portion 412 during the axial movement following the output shaft 212. Of course, the limiting groove 410 can be provided with both the first limiting portion 411 and the second limiting portion 412 to limit the output shaft 212 in both the axial and circumferential directions.

[0078] The first limiting member 400 can be a separate component and then installed on at least one of the handle housing 100 and the movement mechanism 200, or can be integrated on the handle housing 100 or the movement mechanism 200. That is to say, the first limiting member 400 can be integrally formed with the handle housing 100 or the movement mechanism 200. Exemplarily, the first limiting member 400 of the present application is integrally formed with the mounting bracket 220 of the movement mechanism 200. This can simplify the installation, improve the efficiency, and have better integrity.

[0079] In an embodiment where the driving assembly 210 drives the output shaft 212 to reciprocally swing around its own axis, the first limiting member 400 and the second limiting member 500 cooperate to limit the angle of the output shaft 212 to reciprocally swing around its own axis as α, 1.5° ≤ α ≤ 75°. If α < 1.5°, the cleaning strength of the brush head 20 on the teeth is small, and it may be difficult to perform effective cleaning; if α > 75°, when the user uses the electric toothbrush in a fixed posture, the rotation angle of the brush head 20 is too large, and some angles cannot clean the teeth, and it is also difficult to perform effective cleaning.

[0080] The driving assembly 210 includes a stator and a rotor. Among them, the rotor includes the output shaft 212 described above. It can be understood that the driving assembly 210 may have a housing for installing the motor, and the motor also has a housing for fixing the internal power components. The stator includes the housing that does not generate movement, and the first limiting member 400 can be connected to the housing that does not generate movement in the stator, so that the first limiting member 400 can limit the second limiting member 500.

[0081] The driving assembly 210 further includes a bearing and an elastic member. The bearing is located between the stator and the rotor, and the output shaft 212 passes through the bearing; the bearing and the stator are connected by the elastic member. In this way, the rotor can move axially and reset, and the elastic member can be in the form of a shrapnel, a spring, etc.

[0082] During the use of the electric toothbrush 1, water is inevitably contaminated at the shaft hole 100b. In order to ensure both the sealing and waterproof effect and the smooth movement of the output shaft 212, please refer to Figure 4 and Figure 5 , an elastic seal 300 is provided at the shaft hole 100b in the embodiment of the present application. The elastic seal 300 is generally arranged in a cylindrical shape and sleeved on the output shaft 212. A first gap 100c is defined between the part of the output shaft 212 located in the shaft hole 100b and the hole wall of the shaft hole 100b, and at least part of the elastic seal 300 is located in the first gap 100c.

[0083] The elastic seal 300 includes a sleeved portion 310, a deformed portion 320 and a sealing portion 330 connected in sequence. It should be noted that the sequential connection here indicates the connection order of the parts of the elastic seal 300 is the sleeved portion 310, the deformed portion 320 and the sealing portion 330, and is not used to limit the shape of the elastic seal 300. The sleeved portions 310 can be arranged in sequence along the axial direction of the output shaft 212; it can also be as shown in the figure or the figure, the sleeved portion 310 is formed into the inner ring structure of the elastic seal 300, and the deformed portion 320 and the sealing portion 330 are formed into the outer ring structure of the elastic seal 300, so that the elastic seal 300 can effectively fill the first gap 100c, and the length of the elastic seal 300 is not too long, avoiding excessive occupation of the space between the brush head 20 and the end face of the handle shell 100, and the thickness is not too thick, which can have good deformation characteristics while saving materials and space.

[0084] In the embodiment of the present application, please refer to Figure 4 and Figure 5, the socket part 310 is sleeved on the output shaft 212, and the sealing part 330 is clamped between the inner wall of the handle housing 100 and the mounting bracket 220. During the use of the electric toothbrush 1, even if water contaminates the shaft hole 100b, due to the existence of the socket part 310, water cannot enter the accommodation cavity 100a through the gap between the output shaft 212 and the elastic seal 300. And due to the existence of the sealing part 330, water cannot enter the accommodation cavity 100a through the gap between the elastic seal 300 and the inner wall of the accommodation cavity 100a, so the sealing effect is good.

[0085] A second gap 100d is formed between the outer surface of one end of the mounting bracket 220 close to the shaft hole 100b and the inner wall of the accommodation cavity 100a, and the sealing part 330 is filled in the second gap 100d. The outer surface of the sealing part 330 fits the inner wall of the accommodation cavity 100a, so water cannot flow into the accommodation cavity 100a between the sealing part 330 and the inner wall of the accommodation cavity 100a. The inner surface of the sealing part 330 fits the outer surface of the mounting bracket 220, and water also cannot flow into the accommodation cavity 100a between the sealing part 330 and the outer surface of the mounting bracket 220, further enhancing the sealing effect.

[0086] The above-mentioned sealing part 330 is clamped between the inner wall of the handle housing 100 and the mounting bracket 220, and the sealing part 330 is relatively fixed axially. While the elastic seal 300 will move along with the movement of the output shaft 212. The deformation part 320 provided in the present application can generate certain deformations both axially and circumferentially, so as to reduce the influence of the clamping part on the axial and circumferential movements of the output shaft 212, and avoid the situation that the clamping part is damaged and fails or is displaced due to the reciprocating swing of the output shaft 212, affecting the sealing performance, thus improving the service life and sealing effect of the elastic seal 300.

[0087] Further, please refer to Figure 4 and Figure 5 , the handle housing 100 includes a housing part 110 and an extension plate 120. The housing part 110 is provided with an accommodation cavity 100a and a shaft hole 100b. The extension plate 120 is connected to one end of the housing part 110 with the shaft hole 100b and extends into the accommodation cavity 100a. The extension plate 120 forms a part of the hole wall of the shaft hole 100b. A step structure 121 is provided at the free end of the extension plate 120. The sealing part 330 is clamped between the step structure 121 and the movement 200. In this example, the extension plate 120 can make the length of the shaft hole 100b set relatively large, which is convenient for installing the elastic seal 300, and enables the elastic seal 300 to adapt to the increased length to increase the deformation amplitude. The sealing part 330 is clamped by the step structure 121 and the movement 200 both axially and circumferentially, increasing the contact area between the sealing part 330 and the handle housing 100, and further improving the sealing effect.

[0088] In some embodiments, the deformation portion 320 includes a corrugated structure 323 surrounding the output shaft 212. In some of these optional structural forms, the socket portion 310 is formed as an inner ring structure of the elastic seal 300, and the deformation portion 320 and the sealing portion 330 are formed as an outer ring structure of the elastic seal 300. For ease of description, it is defined that the deformation portion 320 has a connected deformation part 321 and an extension part 322. The deformation part 321 extends radially along the output shaft 212 and is connected to the socket portion 310, and the extension part 322 extends axially along the output shaft 212 and is connected to the sealing portion 330.

[0089] Optionally, in the initial position, refer to Figure 4 and Figure 5 , the deformation part 321 is filled at the orifice of the shaft hole 100b. The deformation part 321 can play a certain degree of waterproofing role, blocking most of the moisture at the orifice of the shaft hole 100b outside the accommodation cavity 100a. To strengthen the waterproof effect, the circumferential side surface of the deformation part 321 can be abutted against the wall of the shaft hole 100b, so as to further prevent moisture from entering the shaft hole 100b through the gap between the deformation part 321 and the shaft hole 100b. Of course, even if moisture enters the shaft hole 100b through the gap between the deformation part 321 and the shaft hole 100b, it cannot enter the accommodation cavity 100a through the sealing portion 330. Of course, the circumferential side surface of the deformation part 321 can also be arranged with a gap from the wall of the shaft hole 100b. In this way, there is no frictional effect between the wall of the shaft hole 100b and the circumferential side surface of the deformation part 321, so as to further reduce the constraint effect of the handle housing 100 on the deformation portion 320 of the elastic seal 300, enabling the deformation portion 320 to deform more freely, reducing energy consumption and wear of the deformation portion 320, and being beneficial to the high-speed movement design of the output shaft 212.

[0090] The radial dimension of the deformation part 321 is greater than 2 mm. In this way, when the output shaft 212 sleeved inside the socket portion 310 swings circumferentially, there is always a gap between the outer wall of the output shaft 212 and the inner wall of the shaft hole 100b, and they will not come into direct contact, reducing the noise during use and improving the service life of the output shaft 212 and the handle housing 100.

[0091] In some embodiments, the pleat structure 323 may be disposed in the deformable portion 321 and extend radially along the output shaft 212. The pleat structure 323 includes at least one pleat portion. When the driving assembly 210 drives the output shaft 212 to move away from the initial position along its own axial direction, the socket portion 310 moves with the output shaft 212 and drives at least one pleat portion to tilt and unfold in the moving direction of the output shaft 212, and the pleat structure 323 becomes longer; when the output shaft 212 moves closer to the initial position along its own axial direction, the socket portion 310 moves with the output shaft 212 and drives a plurality of pleat portions to bend or fold, and the pleat structure 323 becomes shorter. When the driving assembly 210 drives the output shaft 212 to rotate reciprocally about its own axis, the socket portion 310 rotates with the output shaft 212, and the pleat structure 323 moves with the socket portion 310 and can twist about the axis of the output shaft 212. Thus, the elastic seal 300 can provide a deformation margin for the telescopic and rotational movements of the output shaft 212 relative to the handle housing 100, and further reduce the influence on the traction of the clamping portion.

[0092] Optionally, the pleat structure 323 includes a raised portion disposed in the deformable portion 321, and the raised portion is exposed outside the shaft hole 100b. The raised portion is arc-shaped. Compared with a plane, the raised portion has greater deformation ability and can provide a deformation margin for the telescopic and / or rotational movements of the output shaft 212 relative to the handle housing 100, reduce the traction influence of the reciprocating swing of the output shaft 212 on the sealing portion 330, and extend the service life of the elastic seal 300.

[0093] Further, the surface of the raised portion exposed outside the shaft hole 100b arches towards the outside of the shaft hole 100b, and the arc-shaped surface can drain the water at the gap between the handle housing 100 and the brush head 20, preventing the formation of a water film between the handle housing 100 and the brush head 20, thereby ensuring the smooth movement of the brush head 20 and improving the efficiency.

[0094] In still other embodiments, please refer to Figure 8, the corrugated structure 323 can also be provided on the extension portion 322 and arranged along the axial direction of the output shaft 212. The corrugated structure 323 includes at least one corrugated portion. The corrugated portion can be an arc-shaped structure arched towards the hole wall of the shaft hole 100b or the output shaft 212, and can be bent or unfolded, having good elasticity; the corrugated portion can also be a folded surface structure with an opening facing the hole wall of the shaft hole 100b or the output shaft 212, that is, it is bent to form two surfaces with an included angle, and can be bent or unfolded, with a large deformation degree. It can be understood that when undergoing the same degree of telescopic deformation, the fewer the number of corrugated portions, the greater the change in the radial dimension of the corrugated portion along the output shaft 212 before and after deformation, which is likely to cause the width of the handle shell 100 to increase and a large gap to exist between the extension portion 322 and the hole wall of the shaft hole 100b, making it easy to hide water. Therefore, in one embodiment, to make the structure of the brush handle 10 more compact, the corrugated structure 323 includes a plurality of successively connected corrugated portions. In this way, the elastic seal 300 can provide a deformation margin for the telescopic movement and rotational movement of the output shaft 212 relative to the handle shell 100, further reducing the influence on the clamping portion.

[0095] In this embodiment, a plurality of corrugated portions are sequentially connected along the axial direction of the output shaft 212. When the output shaft 212 undergoes telescopic movement along its own axial direction, it drives the socket portion 310 to move accordingly. The deformation portion 321 plays a linkage role here, driving each corrugated portion located in the extension portion 322 to be able to bend or fold so that the two ends of the corrugated portion approach each other, thereby shortening the length of the corrugated structure 323; or the deformation portion 321 drives each corrugated portion to unfold so that the two ends of the corrugated portion move away from each other, and the length of the corrugated structure 323 increases; in this way, the corrugated structure 323 realizes telescopic deformation, and the elastic seal 300 can provide a deformation margin for the telescopic movement of the output shaft 212 relative to the handle shell 100.

[0096] Since the deformation portion 320 is made of an elastic material, when the driving assembly 210 drives the output shaft 212 to rotate reciprocally around its own axis, the socket portion 310 rotates with the output shaft 212, and the corrugated structure 323 moves with the socket portion 310 and can twist around the axial direction of the output shaft 212. In this way, the elastic seal 300 can provide a deformation margin for the rotational movement of the output shaft 212 relative to the handle shell 100.

[0097] Of course, when the output shaft 212 simultaneously performs rotational movement and telescopic movement relative to the handle shell 100, the corrugated structure 323 can twist while changing in length to simultaneously support the two movements of the output shaft 212.

[0098] Of course, in other embodiments of the present application, corrugated structures 323 can be provided on both the deformation portion 321 and the extension portion 322 of the deformation portion 321, and the embodiments of the present application do not limit this.

[0099] In the embodiments of the present application, please refer to Figure 4 and Figure 5 , the extension portion 322 extends from the deformation portion 321 into the accommodation cavity 100a. In this way, the extension portion 322 has a longer length in the axial direction. Even when a part of the extension portion 322 is axially pulled during the movement of the output shaft 212, it will not affect the clamping portion, which can effectively improve the sealing performance of the elastic seal 300.

[0100] In some embodiments, the aperture of the through hole 220a is smaller than the outer diameter of the extension portion 322. This means that in the circumferential direction, the through hole 220a is located inside the extension portion 322. Even if some water vapor seeps into the accommodation cavity 100a between the outer surface of the sealing portion 330 and the inner wall of the handle housing 100, it will not enter the mounting bracket 220 through the through hole 220a, further effectively avoiding the risk of damage to the electrical components in the mounting bracket 220 caused by water vapor.

[0101] The movement mechanism 200 further includes a limiting plate 230. The limiting plate 230 is connected to one end of the mounting bracket 220 close to the shaft hole 100b. The limiting plate 230 extends into the space between the socket portion 310 and the extension portion 322. And when the elastic seal 300 moves with the output shaft 212, there is always a gap between the top of the limiting plate 230 and the deformation portion 321. Since the limiting plate 230 is inserted between the socket portion 310 and the extension portion 322, during the movement of the elastic seal 300 with the output shaft 212, the limiting plate 230 can limit the deformation amplitude of the extension portion 322, the deformation portion 321, and the socket portion 310, avoiding the situation where the extension portion 322 completely disengages from the hole wall of the shaft hole 100b and the socket portion 310 completely disengages from the outer wall of the output shaft 212, and can also prevent the deformation portion 321 from being recessed into the accommodation cavity 100a. Moreover, there is always a gap between the top of the limiting plate 230 and the deformation portion 321, and the extension portion 322, the deformation portion 321, and the socket portion 310 can still generate a certain amount of deformation. That is to say, the limiting plate 230 of the present application allows the extension portion 322, the deformation portion 321, and the socket portion 310 to generate deformation, but also limits the deformation amplitude of the extension portion 322, the deformation portion 321, and the socket portion 310, avoiding excessive deformation of the extension portion 322, the deformation portion 321, and the socket portion 310 to ensure the sealing effect.

[0102] In some embodiments of the present application, please refer to Figure 5, the socket part 310 includes a first socket part 311 and a second socket part 312. The first socket part 311 is connected to the deformation part 320; the second socket part 312 is connected to the side of the deformation part 320 away from the first socket part 311. The second socket part 312 is in interference fit with the output shaft 212 or fixedly connected to the output shaft 212 through a restraint member to move with the output shaft 212. During the movement of the second socket part 312 with the output shaft 212, the first socket part 311 can undergo partial elastic deformation. The aperture of the second socket part 312 can be smaller than the outer diameter of the output hole to achieve an interference fit. The restraint member can be sleeved on the second socket part 312 and press the second socket part 312 against the output shaft 212. Both of the above two embodiments can reduce the gap between the second socket part 312 and the output shaft 212 and ensure the sealing effect.

[0103] The first socket part 311 includes a fitting part 3111 and a connecting part 3112. The fitting part 3111 is connected to the deformation part 320; the two opposite sides of the connecting part 3112 are respectively connected to the fitting part 3111 and the second socket part 312. The fitting part 3111 is in contact with the outer wall of the output shaft 212, and there is an air gap 310a between the connecting part 3112 and the outer wall of the output shaft 212. With such a setting, the fitting part 3111 is in contact with the surface of the output shaft 212, playing a certain waterproof role; the space gap separates the connecting part 3112 from the surface of the output shaft 212, enabling the connecting part 3112 to have a certain deformation range, so as to reduce the pulling on the second socket part 312 during the swinging of the output shaft 212, improve the sealing effect between the second socket part 312 and the output shaft 212, and extend the service life of the elastic seal 300.

[0104] Among them, the above-mentioned limiting plate 230 is located between the first socket part 311 and the extension part 322 to prevent the first socket part 311 from completely detaching from the outer wall of the output shaft 212.

[0105] Regarding how to form the air gap 310a, the connecting part 3112 can be set in a folded shape, and there will be a deformation space between the folds, and this part of the space forms the space gap; grooves can also be provided on the outer wall surface of the connecting part 3112. In this example, the connecting part 3112 can be designed with a reduced thickness, so that grooves can be formed on the outer wall surface of the connecting part 3112, and the grooves can form the space gap; the connecting part 3112 can also be arched away from the output shaft 212. With such a setting, the present application can improve the deformation ability of the connecting part 3112, which can not only improve the sealing effect but also extend the service life.

[0106] In the accompanying drawings of this embodiment, the same or similar reference numerals correspond to the same or similar components; in the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "left", "right", etc. indicating the orientation or positional relationship, they are based on the orientation or positional relationship shown in the accompanying drawings. This is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the positional relationship in the accompanying drawings are only for illustrative purposes and cannot be construed as a limitation on the present invention. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0107] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. A brush handle, characterized in that, Comprising: A handle housing having a receiving cavity and a shaft hole communicating with the receiving cavity; A movement mechanism disposed in the receiving cavity. The movement mechanism includes a driving assembly having an output shaft. The driving assembly is capable of driving the output shaft to move. The output shaft passes out of the handle housing through the shaft hole. A first gap is defined between a portion of the output shaft located within the shaft hole and the hole wall of the shaft hole; An elastic seal, at least a portion of the elastic seal is located within the first gap. The elastic seal includes a socket portion, a deformation portion, and a sealing portion connected in sequence. The socket portion is sleeved on the output shaft. The sealing portion is clamped between the inner wall of the handle housing and the movement mechanism. At least the deformation portion is capable of elastic deformation to provide a deformation allowance when the output shaft moves; And A first limiting member disposed in the receiving cavity and mounted on at least one of the handle housing and the movement mechanism, A second limiting member disposed on the output shaft and in limiting cooperation with the first limiting member to define the movement stroke of the output shaft in the axial direction and / or the circumferential direction of the output shaft during the movement of the output shaft.

2. The brush handle according to claim 1, wherein The first limiting member is provided with a limiting groove, and the second limiting member is limited by the limiting groove during the movement of the output shaft.

3. The brush handle according to claim 2, wherein, The limiting groove includes two first limiting portions oppositely disposed in the circumferential direction. The two first limiting portions define a fan-shaped groove body. The second limiting member reciprocally swings within the groove body during the circumferential movement of the output shaft; And / or, the limiting groove includes two second limiting portions spaced apart in the axial direction. The second limiting member is limited by the second limiting portion during the axial movement of the output shaft.

4. The brush handle according to claim 1, characterized in that, The driving assembly is capable of driving the output shaft to reciprocally swing about its own axis. The first limiting member and the second limiting member jointly define the angle α of the reciprocating swing of the output shaft about its own axis, where 1.5° ≤ α ≤ 75°.

5. The brush handle according to claim 1, wherein The movement mechanism further includes: A mounting bracket disposed in the receiving cavity. The sealing portion is clamped between the inner wall of the handle housing and the mounting bracket. The driving assembly is connected to the mounting bracket. One end of the mounting bracket close to the shaft hole has a through hole, and the output shaft sequentially passes through the through hole and the shaft hole; Wherein, the first limiting member is connected to the mounting bracket.

6. The brush handle according to claim 5, characterized in that, A second gap is formed between the outer surface of one end of the mounting bracket close to the shaft hole and the inner wall of the receiving cavity, and the sealing portion is filled in the second gap.

7. The brush handle according to claim 1, wherein The driving assembly includes a stator and a rotor, and the rotor includes the output shaft; Wherein, the limiting member is connected to the stator.

8. The brush handle according to claim 7, characterized in that, The driving assembly further includes: A bearing, the bearing is located between the stator and the rotor, and the output shaft passes through the bearing; and An elastic member, the bearing and the stator are connected by the elastic member.

9. The brush handle according to claim 1, characterized in that, The deformation portion includes a corrugated structure surrounding the output shaft. The corrugated structure can expand and contract in the axial direction of the output shaft and can twist about the axial direction of the output shaft; Wherein, the corrugated structure extends along the axial direction of the output shaft, or the corrugated structure extends along the radial direction of the output shaft and the corrugated part is located at the orifice of the shaft hole.

10. The brush handle according to claim 9, wherein The corrugated structure includes a plurality of corrugated parts, and the plurality of corrugated parts are sequentially connected along the axial direction of the output shaft, or the plurality of corrugated parts are sequentially connected along the radial direction of the output shaft.

11. The brush handle according to claim 9, characterized in that, The corrugated structure includes a bulging part, the bulging part is exposed outside the shaft hole, and the surface of the bulging part exposed outside the shaft hole bulges towards the outside of the shaft hole.

12. The brush handle according to any one of claims 1 to 11, characterized in that The deformation part includes a deformed part, which extends along the radial direction of the output shaft and is connected to the socket part; and an extension part, which is connected to the deformed part and extends along the axial direction of the output shaft, and one side of the extension part away from the deformed part is connected to the sealing part; Wherein, the outer wall surface of the extension part abuts against the inner wall of the shaft hole, and the extension part extends from the deformed part into the accommodation cavity.

13. The brush handle according to claim 12, wherein The movement mechanism further includes: a mounting bracket, which is arranged in the accommodation cavity, the sealing part is clamped between the inner wall of the handle shell and the mounting bracket, the driving assembly is connected to the mounting bracket, one end of the mounting bracket close to the shaft hole has a through hole, and the output shaft sequentially passes through the through hole and the shaft hole; Wherein, the aperture of the through hole is smaller than the outer diameter of the extension part.

14. The brush handle according to claim 12, wherein, The radial dimension of the deformed part is greater than 2 mm.

15. The brush handle according to claim 12, characterized in that, The handle shell includes; a shell part, which is provided with the accommodation cavity and the shaft hole; and an extension plate, which is connected to one end of the shell part having the shaft hole and extends into the accommodation cavity, the extension plate forms a part of the hole wall of the shaft hole, a step structure is arranged at the free end of the extension plate, and the sealing part is clamped between the step structure and the movement mechanism.

16. The brush handle according to claim 15, characterized in that, The movement mechanism further includes: a mounting bracket, which is installed in the accommodation cavity and is used for installing the driving assembly; and a limiting plate, which is connected to one end of the mounting bracket close to the shaft hole, the limiting plate extends into the space between the socket part and the extension part, and when the elastic sealing part moves along with the output shaft, there is always a gap between the top of the limiting plate and the deformed part, and the limiting plate is used to limit the deformation amplitude of the extension part, the deformed part and the first socket part during the movement of the elastic sealing part along with the output shaft.

17. The brush handle according to claim 12, wherein, The socket part includes: a first socket part, which is connected to the deformation part; and a second socket part, which is connected to the side of the deformation part away from the first socket part, the second socket part is in interference fit with the output shaft or is fixedly connected to the output shaft through a restraint to move along with the output shaft, and the first socket part can undergo partial elastic deformation during the movement of the second socket part along with the output shaft.

18. The brush handle according to claim 17, wherein, The first socket part includes: a fitting part, which is connected to the deformation part; and a connecting part, two opposite sides of the connecting part are respectively connected to the fitting part and the second socket part, the fitting part fits against the outer wall of the output shaft, and there is an air gap between the connecting part and the outer wall of the output shaft.

19. The brush handle according to claim 18, characterized in that, The connecting portion is provided with folds; or the outer wall surface of the connecting portion is provided with grooves; or the connecting portion is arched away from the output shaft.

20. An electric toothbrush, characterized in that, The electric toothbrush includes: a brush handle as described in any one of claims 1 to 19; and a brush head, the brush head is detachably connected to the portion of the output shaft outside the accommodation cavity.

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