Electric toothbrush

Abstract

The utility model discloses an electric toothbrush. The electric toothbrush comprises a handle shell, a motor and a sealing sleeve. The handle shell is provided with a through hole. The motor comprises a motor shell and a motor shaft which are connected, the motor shell is arranged in the handle shell, and at least part of the motor shaft penetrates through the through hole. The sealing sleeve comprises a first sleeve body, a second sleeve body and a connecting wall, the first sleeve body is located in a cavity of the second sleeve body, and the connecting wall is connected with the end faces, facing the same direction, of the first sleeve body and the second sleeve body. The first sleeve body comprises an inner side wall facing the motor shaft, the inner side wall of the first sleeve body is uneven, at least part of the motor shaft penetrates through the first sleeve body and partially abuts against the inner side wall of the first sleeve body, the second sleeve body is arranged in the through hole and abuts against the inner side wall of the handle shell, and the sealing sleeve is at least used for sealing a gap between the motor shaft and the inner wall of the through hole. The first sleeve body can directly abut against at least part of the motor shaft, the first sleeve body does not need to be fixed to the motor shaft through a fixing structure, and the rotating angle of the motor shaft can not be limited.

Description

Technical Field

[0001] The present application relates to the field of cleaning technology, and more specifically, to an electric toothbrush. Background Art

[0002] An electric toothbrush is an electronic device that can clean the oral cavity. The motor in the brush handle drives the toothbrush head to vibrate so that the bristles on the toothbrush head can clean the surface and gaps of the teeth. During the use of the electric toothbrush, the seal mounted on the motor shaft can prevent liquid or foam from entering the brush handle. Currently, an additional fixing structure is required between the motor shaft and the seal to make the motor shaft and the seal fit tightly. However, when the fixing structure is used to fix the relative position between the seal and the motor shaft, the rotation angle of the motor shaft is relatively limited, and the free rotation of the motor shaft cannot be satisfied. Utility Model Content

[0003] The embodiments of the present application provide an electric toothbrush, which is at least used to solve the problem that the sealing member easily moves along with the motor shaft, resulting in poor sealing effect.

[0004] The electric toothbrush of the embodiment of the present application includes a handle shell, a motor and a sealing sleeve. The handle shell is provided with a through hole. The motor includes a motor shell and a motor shaft connected to each other, the motor shell is arranged in the handle shell, and at least a part of the motor shaft is passed through the through hole. The sealing sleeve includes a first sleeve, a second sleeve and a connecting wall, the first sleeve is located in the cavity of the second sleeve, and the connecting wall connects the end faces of the first sleeve and the second sleeve facing the same direction respectively. The first sleeve includes an inner side wall facing the motor shaft, the inner side wall of the first sleeve is uneven, at least a part of the motor shaft is passed through the first sleeve and partially contacts with the inner side wall of the first sleeve, the second sleeve is arranged in the through hole and contacts with the inner side wall of the handle shell, and the sealing sleeve is at least used to seal the gap between the motor shaft and the inner wall of the through hole.

[0005] The motor shaft can be provided with a through hole to drive the toothbrush head to vibrate, and at least part of the structure of the seal is provided in the through hole, so that the seal can seal the gap between the outer wall of the motor shaft and the inner wall of the through hole, and the gap between the outer wall of the motor shaft and the inner wall of the handle shell. Among them, the first sleeve can directly contact with at least part of the motor shaft, and the second sleeve can directly contact with the inner wall of the handle shell. The connecting wall is used to connect the two. At this time, the first sleeve does not need to be fixed to the motor shaft through a fixing structure, and the first sleeve will not affect the rotation of the motor shaft, and the rotation of the motor shaft will not affect the sealing performance of the seal. The rotation angle of the motor shaft can be unrestricted, so that the electric toothbrush can achieve more functions.

[0006] In some embodiments, the motor shaft is used to rotate relative to the motor housing around the length direction of the handle shell. When the rotation angle of the motor shaft is within the range of a first rotation angle, the first sleeve rotates together with the motor shaft, and the outer wall of the second sleeve conflicts with the inner wall of the handle shell.

[0007] Since only a part of the structure of the first sleeve body contacts the motor shaft, the friction between the motor shaft and the first sleeve body is smaller than that of the scheme in which the first sleeve body contacts the motor shaft completely. Therefore, when the rotation angle of the motor shaft is within the range of the preset first rotation angle, the first sleeve body can rotate with the motor shaft around the length direction of the handle shell by a certain angle under the action of friction force, and at this time, the connecting wall will be partially deformed so that the outer wall of the second sleeve body will not fall off the handle shell, thereby ensuring the sealing effect of the sealing sleeve.

[0008] In some embodiments, the inner side wall of the first sleeve includes at least one annular protrusion, at least one of the protrusions abuts against the motor shaft, and at least a portion of the inner side wall of the first sleeve is spaced apart from the motor shaft.

[0009] When the first sleeve is sleeved on the motor shaft, the protrusion can contact the motor shaft to form a seal. The inner side wall of the first sleeve can be spaced from the motor shaft to reduce the contact area between the first sleeve and the motor shaft. When the external pressure remains unchanged, the friction between the first sleeve and the motor shaft is smaller than when the first sleeve is not provided with the protrusion, so that the first sleeve can achieve a sealing effect without restricting the rotation of the motor shaft.

[0010] In some embodiments, the inner side wall of the first sleeve includes a first portion and a second portion spaced apart from each other, the first portion is disposed between any two adjacent protrusions and spaced apart from the motor shaft, and the second portion abuts against the motor shaft.

[0011] When the first sleeve is sleeved on the motor shaft, at least two protrusions can contact the motor shaft, so that the first part between two adjacent protrusions is separated from the motor shaft, reducing the contact area between the first sleeve and the motor shaft, and reducing the friction between the first sleeve and the motor shaft. The second part outside the area where the protrusions are located can contact the motor shaft to improve the sealing effect of the sealing sleeve and prevent external liquid or foam from flowing in through the gap between the first part and the motor shaft.

[0012] In some embodiments, the inner side wall of the first sleeve includes a corrugated surface, and at least a portion of the corrugated surface is configured to interfere with the motor shaft.

[0013] The corrugated surface is roughly a continuously bent curved surface structure formed on the inner wall of the first sleeve. The protruding part of the corrugated surface outside the first sleeve can contact with the motor shaft, and the recessed part of the corrugated surface outside the first sleeve can be separated from the motor shaft. At this time, only the protruding part of the corrugated surface can form friction with the rotating motor shaft. Therefore, compared with the solution in which the contact surface between the sealing sleeve and the motor shaft is a smooth surface, the corrugated surface can reduce the contact area between the first sleeve and the motor shaft, thereby reducing the friction between the two, avoiding the motor shaft from driving the first sleeve to twist and affecting the sealing effect of the sealing sleeve.

[0014] In some embodiments, the inner side wall of the first sleeve includes a yield surface and a concave-convex surface connected to each other, at least a portion of the concave-convex surface is used to abut against the motor shaft, and the yield surface is separated from the motor shaft.

[0015] The clearance surface is generally a curved surface structure with a depression extending in the direction of the outer side wall of the first sleeve, and the concavoconvex surface is generally a curved surface structure with discontinuous protrusions formed on the inner side wall of the first sleeve. When the first sleeve is sleeved on the motor shaft, the depression on the clearance surface can be separated from the motor shaft, and the discontinuous protrusions on the concavoconvex surface can collide with the motor shaft. The portion between any two adjacent protrusions on the concavoconvex surface can be either a plane or a depression, and the portion between any two adjacent protrusions can also be separated from the motor shaft to further reduce the contact area between the first sleeve and the motor shaft, thereby reducing the friction between the two, and preventing the motor shaft from driving the first sleeve to twist and affecting the sealing effect of the sealing sleeve.

[0016] In some embodiments, along the length direction of the handle shell, the connecting wall includes a top surface and a bottom surface facing each other, the top surface of the connecting wall is flush with the end surface of one end of the handle shell provided with a through hole in the length direction of the handle shell, and the bottom surface of the connecting wall faces the side where the first sleeve and the second sleeve are located.

[0017] The connecting wall is a structure for connecting the first sleeve and the second sleeve. When the motor shaft rotates, at least part of the structure of the first sleeve and the first sleeve can rotate a certain angle around the length direction of the handle shell together with the motor shaft under the action of friction. At this time, the connecting wall will be partially deformed so that the outer wall of the second sleeve will not fall off the handle shell, thereby ensuring the sealing effect of the sealing sleeve.

[0018] In some embodiments, the second sleeve includes a sleeve and a flange. One end of the sleeve is connected to the first sleeve via the connecting wall, and the outer wall of the sleeve contacts the inner wall of the through hole. Along the length direction of the handle shell, the flange is provided at the other end of the sleeve and is arranged opposite to the connecting wall, the outer wall of the flange contacts the inner wall of the handle shell, and at least part of the structure of the motor shell contacts the inner wall of the flange to clamp the flange together with the handle shell.

[0019] The sleeve and the flange can be either an integrally formed structure or a separately formed structure. The sleeve and the flange can contact the inner wall of the handle shell to prevent external liquid, water vapor or foam from entering the handle shell. Part of the structure of the motor shell can clamp the flange together with the handle shell to make the flange contact closely with the handle shell, thereby improving the sealing performance of the second sleeve.

[0020] In some embodiments, the outer contour diameter of the flange is larger than the contour diameter of the second sleeve, so that a sealing wall is formed at the connection between the flange and the sleeve, at least a portion of the outer wall of the sealing wall is in contact with the handle shell, and the inner wall of the sealing wall is in contact with at least a portion of the structure of the motor shell, and the sealing wall is used to seal the gap between the handle shell and the motor shell.

[0021] The outer contour of the second sleeve can match the inner contour of part of the handle shell, at this time, the sleeve of the second sleeve can contact the inner wall of the through hole, and the sealing wall and the flange both contact the inner wall of the handle shell outside the through hole. In the case of external liquid or foam flowing down, the liquid or foam may partially enter between the sleeve and the inner wall of the through hole, and then be blocked by the sealing structure formed between the sealing wall and the handle shell. If the sealing structure formed between the sealing wall and the handle shell is also difficult to block the liquid, the sealing structure formed between the outer wall of the flange and the inner wall of the handle shell can also prevent the liquid or foam from contacting the structure inside the handle shell, thereby improving the sealing effect.

[0022] In some embodiments, a plurality of sealing portions are provided on the outer wall of the flange and / or the outer wall of the sealing wall, and the sealing portions are annular protrusions, and the sealing portions are in contact with the inner wall of the handle shell.

[0023] When at least part of the structure of the sealing sleeve is installed in the through hole, the sealing portion can come into contact with the inner wall of the handle shell and deform, so that the flange and / or the sealing wall are completely sealed with the inner wall of the handle shell, thereby improving the sealing performance of the sealing sleeve and preventing external liquids, water vapor or foam from entering the handle shell.

[0024] In some embodiments, the electric toothbrush further includes a limit member, which is disposed at one end of the motor housing facing the through hole and extends into the sealing sleeve, and the limit member and the motor shaft jointly clamp the first sleeve to limit the movement of the sealing sleeve relative to the motor shaft and / or the limit member and the handle shell jointly clamp the second sleeve to limit the movement of the sealing sleeve relative to the handle shell.

[0025] The stopper can fix the relative position between the sealing sleeve and the motor shaft or the relative position between the sealing sleeve and the handle shell. When the stopper and the motor shaft clamp the first sleeve, the first sleeve will not fall off the motor shaft, causing a large deformation of the sealing sleeve as a whole, thereby preventing liquid or foam from entering the motor. When the stopper and the handle shell clamp the second sleeve, the second sleeve is more tightly combined with the inner wall of the handle shell, and the second sleeve will not fall off the handle shell, thereby preventing liquid or foam from entering the handle shell and causing damage to the electrical structure.

[0026] In some embodiments, the limiting member and the motor housing are formed separately or the limiting member is an integrated structure formed by extending the motor housing in a direction close to the through hole.

[0027] In the case of different specifications of electric toothbrushes, the sizes of the matching sealing sleeves and motor housings will also be different. In the case where the limiter and the motor housing are separately formed, the limiters of different specifications can be installed and adapted to the motor housing respectively. In the case where the limiter and the motor housing are an integrated structure, when installing the sealing sleeve, the limiter can be directly extended into the sealing sleeve to limit the position of the sealing sleeve, without the need for secondary installation, and the structure of the electric toothbrush is simpler.

[0028] In some embodiments, the outer wall of the first sleeve is spaced apart from the inner wall of the second sleeve, and the position limiting member includes a supporting portion and a connecting portion. At least a portion of the supporting portion is disposed in the space between the outer wall of the first sleeve and the inner wall of the second sleeve, and the supporting portion is used to limit the position of the sealing sleeve relative to the motor and / or the handle housing. The supporting portion includes a first end and a second end facing each other, the first end of the supporting portion is a free end, and the connecting portion is used to connect the second end of the supporting portion and the motor housing.

[0029] The support part and the connection part are structures connected in sequence along the length direction of the handle shell, and the support part can extend into the gap between the first sleeve and the second sleeve to simultaneously fix the positions of the first sleeve, the second sleeve and the connection wall. The connection part can carry the support part and fix the support part on the motor shell, thereby improving the overall strength of the limiter and preventing the limiter from breaking and damaging.

[0030] In some embodiments, the support portion contacts the outer side wall of the first sleeve to clamp the first sleeve together with the motor shaft and / or the support portion contacts the inner side wall of the second sleeve to clamp the second sleeve together with the handle shell.

[0031] When the support part is in contact with the outer wall of the first sleeve, the support part and the motor shaft can clamp the first sleeve so that the first sleeve is in close contact with the motor shaft, and the first sleeve will not fall off the motor shaft, causing a large deformation of the sealing sleeve as a whole, thereby preventing liquid or foam from entering the motor. When the support part is in contact with the inner wall of the second sleeve, the support part and the handle shell can clamp the second sleeve so that the second sleeve is in close contact with the handle shell, and the second sleeve is more tightly combined with the inner wall of the handle shell, and the second sleeve will not fall off the handle shell, thereby preventing liquid or foam from entering the handle shell and causing damage to the electrical structure.

[0032] In some embodiments, along the length direction of the handle shell, the connecting wall includes a top surface and a bottom surface facing each other, and at least a portion of the supporting portion is disposed in a gap between the outer side wall of the first sleeve body and the inner side wall of the second sleeve body to support the connecting wall. There is a gap between the first end of the supporting portion and the first surface of the connecting wall, or the first end of the supporting portion contacts the first surface of the connecting wall.

[0033] When the first sleeve body rotates a certain angle around the length direction of the handle shell together with the motor shaft under the action of friction, the connecting wall will be partially deformed, and the support part can support the connecting wall in the length direction of the handle shell to prevent the top surface of the connecting wall from moving toward the side close to the motor, causing the second sleeve body to be pulled away from the handle shell. When the free end of the support part contacts the connecting wall, the support part and the connecting wall are rigidly supported, and the connecting wall cannot move relative to the handle shell. When there is a gap between the free end of the support part and the connecting wall, the connecting wall has a certain amount of space for movement, but when the connecting wall moves to a position in contact with the free end of the support part, the second sleeve body still contacts the inner wall of the handle shell to avoid affecting the sealing performance of the sealing sleeve.

[0034] In some embodiments, an outer side wall of the first sleeve is provided with an abutment portion, which is used to abut against the support portion and / or an inner side wall of the second sleeve is provided with an abutment portion, which is used to abut against the support portion.

[0035] When the abutment on the first sleeve body contacts the support part, the support part can clamp the first sleeve body together with the motor shaft, and the contact area between the support part and the first sleeve body is small, so when the support part is affected by the motor shaft and vibrates, it is not easy to affect the sealing performance of the first sleeve body. When the abutment on the second sleeve body contacts the support part, the support part can clamp the second sleeve body together with the handle shell, and the protruding abutment can reduce the gap between the support part and the first sleeve body, preventing the support part from shaking relative to the second sleeve body in a direction perpendicular to the length direction of the handle shell, affecting the clamping effect.

[0036] Additional aspects and advantages of the embodiments of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the embodiments of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0038] Figure 1 is a three-dimensional schematic diagram of an electric toothbrush according to certain embodiments of the present application;

[0039] Figure 2 yes Figure 1 An exploded schematic diagram of an electric toothbrush shown;

[0040] Figure 3 yes Figure 1 A schematic cross-sectional view of an electric toothbrush shown;

[0041] Figure 4 yes Figure 3 A magnified schematic diagram of position IV in the middle;

[0042] Figure 5 is a cross-sectional schematic diagram of a seal of an electric toothbrush according to some embodiments of the present application;

[0043] Figure 6 is a cross-sectional schematic diagram of a seal of an electric toothbrush according to other embodiments of the present application;

[0044] Figure 7 It is a cross-sectional schematic diagram of the seal of the electric toothbrush according to some embodiments of the present application.

[0045] Description of main component symbols:

[0046] 100, electric toothbrush; X, length direction; 10, handle shell; 11, through hole; 101, first end of handle shell; 103, second end of handle shell; 30, motor; 31, motor shell; 33, motor shaft; 50, sealing sleeve; 51, first sleeve; 5101, first end of first sleeve; 5103, second end of first sleeve; 511, raised portion; 5111, first portion; 5113, second portion; 513, folded surface; 515 , a yield surface; 517, a concave and convex surface; 53, a second sleeve; 5301, a first end of the second sleeve; 5303, a second end of the second sleeve; 531, a sleeve; 533, a flange; 535, a sealing wall; 55, a connecting wall; 551, a top surface; 553, a bottom surface; 571, a sealing portion; 573, abutting portion; 70, a limiting member; 71, a supporting portion; 711, a first end of the supporting portion; 713, a second end of the supporting portion; 73, a connecting portion. DETAILED DESCRIPTION

[0047] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions from beginning to end. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the embodiments of the present application, and cannot be understood as limiting the embodiments of the present application.

[0048] In the description of the present application, it should be understood that the terms "upper", "inside", "outside", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0049] In the description of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "installation" and "connection" should be understood in a broad sense. In an example, it can be a fixed connection, or a detachable connection, or an integral connection; it can be a mechanical connection, or an electrical connection, or they can communicate with each other; it can be a direct connection, or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements.

[0050] See also Figure 1 and Figure 2The electric toothbrush 100 of the present application includes a handle shell 10, a motor 30 and a sealing sleeve 50. The handle shell 10 is provided with a through hole 11. The motor 30 includes a motor shell 31 and a motor shaft 33 connected to each other. The motor shell 31 is arranged in the handle shell 10, and at least part of the motor shaft 33 is passed through the through hole 11. The sealing sleeve 50 includes a first sleeve body 51, a second sleeve body 53 and a connecting wall 55. The first sleeve body 51 is located in the cavity of the second sleeve body 53, and the connecting wall 55 connects the end faces of the first sleeve body 51 and the second sleeve body 53 facing the same direction. The first sleeve 51 includes an inner wall facing the motor shaft 33, the inner wall of the first sleeve 51 is uneven, at least part of the motor shaft 33 is inserted into the first sleeve 51 and contacts with the inner wall part of the first sleeve 51, the second sleeve 53 is arranged in the through hole 11 and contacts with the inner wall of the handle shell 10, and the sealing sleeve 50 is at least used to seal the gap between the motor shaft 33 and the inner wall of the through hole 11.

[0051] The electric toothbrush 100 includes a brush handle and a toothbrush head connected to each other, and the brush handle includes a handle shell 10, a sealing sleeve 50 and a motor 30 connected to each other, and the sealing sleeve 50 and at least part of the structure of the motor 30 are arranged in the handle shell 10. The extension direction of the motor 30 is the same as the extension direction of the brush handle. When the motor shaft 33 drives the toothbrush head to vibrate, the relative position between the motor shell 31 of the motor 30 and the handle shell 10 will not change, and the motor shaft 33 of the motor 30 can rotate relative to the motor shell 31 around the length direction X of the handle shell 10 as the axis.

[0052] In the electric toothbrush 100 of the present application, the motor shaft 33 can pass through the through hole 11 to drive the toothbrush head to vibrate, and at least part of the structure of the seal is arranged in the through hole 11, so that the seal can seal the gap between the outer wall of the motor shaft 33 and the inner wall of the through hole 11, and the gap between the outer wall of the motor shaft 33 and the inner wall of the handle shell 10. Among them, the first sleeve 51 can directly contact at least part of the motor shaft 33, and the second sleeve 53 can directly contact the inner wall of the handle shell 10, and the connecting wall 55 is used to connect the two. At this time, the first sleeve 51 does not need to be fixed to the motor shaft 33 through a fixing structure, and the first sleeve 51 will not affect the rotation of the motor shaft 33, and the rotation of the motor shaft 33 will not affect the sealing performance of the seal. The rotation angle of the motor shaft 33 can be unrestricted, so that the electric toothbrush 100 can achieve more functions.

[0053] The electric toothbrush 100 is further described below with reference to the accompanying drawings.

[0054] See also Figure 2 and Figure 3In some embodiments, the handle shell 10 is a shell structure whose length is greater than the width or diameter, and the material of the handle shell 10 includes but is not limited to metal, plastic or plastic. Along the length direction X of the handle shell 10, the handle shell 10 includes a first end 101 and a second end 103 that are arranged opposite to each other. The width or diameter of the first end 101 of the handle shell 10 on a cross section perpendicular to the length direction X of the handle shell 10 can be the same as or different from the width or diameter of the second end 103 of the handle shell 10 on a cross section perpendicular to the length direction X of the handle shell 10, and there is no restriction here. In the case where the widths or diameters of the two ends of the handle shell 10 are different, the width of the first end 101 of the handle shell 10 is closer to the width of one end of the toothbrush head close to the handle shell 10, and the outer contour curve formed by the two after being installed with each other is softer, and there will be no platform that can accumulate stains such as liquid or foam. The first end 101 of the handle shell 10 is provided with a through hole 11 for the motor shaft 33 of the power supply 30 to extend out, and the motor shaft 33 of the handle shell 10 extending out of the handle shell 10 can be connected to the toothbrush head. The sealing sleeve 50 can be disposed in the through hole 11 and make at least part of the outer wall of the second sleeve 53 contact the inner wall of the through hole 11, and at least part of the outer wall of the second sleeve 53 can contact the inner wall of the handle shell 10. The second end 103 of the handle shell 10 is sealed to protect the internal structure and prevent the internal structure of the handle shell 10 from being corroded and damaged in a humid environment.

[0055] See also Figure 2 and Figure 3 In some embodiments, the motor 30 is a component that is partially installed in the handle shell 10 and can drive the toothbrush head to vibrate. The motor 30 includes a motor shell 31 and a motor shaft 33 that are connected to each other. The motor shaft 33 can rotate relative to the motor shell 31 around the length direction X of the handle shell 10. The sealing sleeve 50 can be sleeved on the motor shaft 33 so that at least part of the inner wall of the first sleeve 51 is in contact with the motor shaft 33. The motor shell 31 and the handle shell 10 can be directly connected, or indirectly connected through other structures in the handle shell 10, or separated from each other, which is not limited here. Along the length direction X of the handle shell 10, in some embodiments, the motor shaft 33 extends from the end face of the motor shell 31 close to the first end 101 of the handle shell 10. In other embodiments, the motor shaft 33 passes through the motor shell 31.

[0056] Further, in certain embodiments, when the angle of rotation of the motor shaft 33 is within the range of the first rotation angle, since the sealing sleeve 50 is made of a flexible material, the sealing sleeve 50 will partially deform so that the first sleeve 51 can rotate around the length direction X of the handle shell 10 with the motor shaft 33 under the action of friction force. At this time, the connecting wall 55 connecting the first sleeve 51 and the second sleeve 53 will partially deform so that the outer wall of the second sleeve 53 will not fall off the handle shell 10, thereby ensuring the sealing effect of the sealing sleeve 50. When the angle of rotation of the motor shaft 33 exceeds the range of the first rotation angle, the friction between the first sleeve 51 and the motor shaft 33 is greater than the torsional force generated when the motor shaft 33 rotates, so the first sleeve 51 and the motor shaft 33 will separate from each other, and at this time, the sealing sleeve 50 partially recovers its deformation, and the motor shaft 33 can rotate relative to the first sleeve 51. In the embodiment of the present application, only a partial structure of the first sleeve 51 is in contact with the motor shaft 33. Compared with a solution in which the first sleeve 51 is in full contact with the motor shaft 33, the friction between the motor shaft 33 and the first sleeve 51 is smaller.

[0057] See also Figure 3 and Figure 4 In some embodiments, the sealing sleeve 50 is a flexible component that can seal the gap between the handle shell 10 and the motor 30 to prevent external liquid, water vapor or foam from entering the handle shell 10 or the motor shell 31. The material of the sealing sleeve 50 includes but is not limited to plastic, silicone or rubber. The first sleeve 51 and the second sleeve 53 are both cylindrical structures, and the connecting wall 55 is an annular wall that connects the first sleeve 51 and the second sleeve 53 respectively. The two ends of the first sleeve 51 are through, one end of the second sleeve 53 is open, and the other end is blocked by the connecting wall 55. The outer contour size of the cross section of the first sleeve 51 in the longitudinal direction X perpendicular to the handle shell 10 is smaller than the outer contour size of the cross section of the second sleeve 53 in the longitudinal direction X perpendicular to the handle shell 10, so that the first sleeve 51 can be coaxially and / or concentrically arranged with the second sleeve 53 after being nested with each other. In some embodiments, the first sleeve 51, the second sleeve 53 and the connecting wall 55 are integrally formed soft rubber parts. When the first sleeve 51 is sleeved on the motor shaft 33 and moved to the installation position, the outer wall of the second sleeve 53 can contact the inner wall of the handle shell 10, and along the length direction X of the handle shell 10, the side of the connecting wall 55 facing the outside of the seal can contact the outside. In some embodiments, the outer wall of the first sleeve 51 and the inner wall of the second sleeve 53 are spaced apart. That is, there is a gap between the first sleeve 51 and the second sleeve 53. In other embodiments, the outer wall of the first sleeve 51 and the inner wall of the second sleeve 53 are at least partially connected.

[0058] Further, in some embodiments, please combine Figure 5The inner side wall of the first sleeve 51 includes at least one annular protrusion 511, at least one protrusion 511 contacts the motor shaft 33, and at least part of the inner side wall of the first sleeve 51 is spaced from the motor shaft 33. When the first sleeve 51 is sleeved on the motor shaft 33, the protrusion 511 can contact the motor shaft 33 to form a seal. The inner side wall of the first sleeve 51 can be spaced from the motor shaft 33 to reduce the contact area between the first sleeve 51 and the motor shaft 33. When the external pressure remains unchanged, compared with the case where the first sleeve 51 is not provided with the protrusion 511, the friction between the first sleeve 51 and the motor shaft 33 is smaller, so that the first sleeve 51 will not restrict the rotation of the motor shaft 33 while achieving a sealing effect.

[0059] Specifically, in some embodiments, the inner side wall of the first sleeve 51 includes a first portion 5111 and a second portion 5113 spaced apart from each other, the first portion 5111 is disposed between any two adjacent protrusions 511 and spaced apart from the motor shaft 33, and the second portion 5113 contacts the motor shaft 33. When the first sleeve 51 is sleeved on the motor shaft 33, at least two protrusions 511 can contact the motor shaft 33, so that the first portion 5111 disposed between two adjacent protrusions 511 is separated from the motor shaft 33, reducing the contact area between the first sleeve 51 and the motor shaft 33, and reducing the friction between the first sleeve 51 and the motor shaft 33. The second portion 5113 located outside the area where the protrusions 511 are located can contact the motor shaft 33 to improve the sealing effect of the sealing sleeve 50, and prevent external liquid or foam from flowing in through the gap between the first portion 5111 and the motor shaft 33.

[0060] In other embodiments, please combine Figure 6 The inner side wall of the first sleeve 51 includes a corrugated surface 513, which is generally a continuously bent curved surface structure formed on the inner side wall of the first sleeve 51, and at least part of the corrugated surface 513 is used to contact the motor shaft 33. Specifically, the part of the corrugated surface 513 protruding into the first sleeve 51 can contact the motor shaft 33, and the part of the corrugated surface 513 recessed outside the first sleeve 51 can be separated from the motor shaft 33. At this time, only the protruding part of the corrugated surface 513 can form friction with the rotating motor shaft 33. Therefore, compared with the solution in which the contact surface between the sealing sleeve 50 and the motor shaft 33 is a smooth surface, the corrugated surface 513 can reduce the contact area between the first sleeve 51 and the motor shaft 33, thereby reducing the friction between the two, and preventing the motor shaft 33 from driving the first sleeve 51 to twist and affecting the sealing effect of the sealing sleeve 50.

[0061] In some other embodiments, please combine Figure 7The inner side wall of the first sleeve 51 includes a gap-forming surface 515 and a concavo-convex surface 517 connected to each other. The gap-forming surface 515 is generally a curved surface structure with a concave extending in the direction of the outer side wall of the first sleeve 51. The concavo-convex surface 517 is generally a curved surface structure with discontinuous protrusions formed on the inner side wall of the first sleeve 51. At least part of the concavo-convex surface 517 is used to contact the motor shaft 33, and the gap-forming surface 515 is separated from the motor shaft 33. Specifically, when the first sleeve 51 is sleeved on the motor shaft 33, the concave on the gap-forming surface 515 can be separated from the motor shaft 33, and the discontinuous protrusion on the concavo-convex surface 517 can contact the motor shaft 33. The portion between any two adjacent protrusions on the concave-convex surface 517 can be either a plane or a depression, and the portion between any two adjacent protrusions can also be separated from the motor shaft 33 to further reduce the contact area between the first sleeve 51 and the motor shaft 33, thereby reducing the friction between the two, and preventing the motor shaft 33 from driving the first sleeve 51 to twist and affecting the sealing effect of the sealing sleeve 50.

[0062] Furthermore, in some embodiments, the connecting wall 55 is a structure for connecting the first sleeve 51 and the second sleeve 53. Along the length direction X of the handle shell 10, the connecting wall 55 includes a top surface 551 and a bottom surface 553 opposite to each other. The top surface 551 of the connecting wall 55 is located outside the handle shell 10 and is flush with the end surface of the handle shell 10 at one end provided with the through hole 11 in the length direction X of the handle shell 10. The bottom surface 553 of the connecting wall 55 faces the side where the first sleeve 51 and the second sleeve 53 are located. When the motor shaft 33 rotates, since at least part of the structure of the first sleeve 51 and the first sleeve 51 can rotate with the motor shaft 33 around the length direction X of the handle shell 10 at a certain angle under the action of friction, the connecting wall 55 will be partially deformed at this time, so that the outer wall of the second sleeve 53 will not fall off from the handle shell 10, thereby ensuring the sealing effect of the sealing sleeve 50.

[0063] Furthermore, please combine Figure 5In some embodiments, the second sleeve 53 includes a sleeve 531 and a flange 533. The sleeve 531 is generally a cylindrical structure with one end sealed by a connecting wall 55 and the other end open. One end of the flange 533 is connected to the sleeve 531, and the other end of the flange 533 is a free end. The motor housing 31 is located at the other end of the flange 533 and can contact the flange 533. The sleeve 531 and the flange 533 can be either an integrally formed structure or a separately formed structure. One end of the sleeve 531 is connected to the first sleeve 51 via the connecting wall 55, and the outer wall of the sleeve 531 is in contact with the inner wall of the through hole 11. Along the length direction X of the handle housing 10, the flange 533 is arranged at the other end of the sleeve 531 and is arranged opposite to the connecting wall 55. The outer wall of the flange 533 contacts the inner wall of the handle housing 10, and at least part of the structure of the motor housing 31 contacts the inner wall of the flange 533 to clamp the flange 533 together with the handle housing 10. The sleeve 531 and the flange 533 can contact the inner wall of the handle housing 10 to prevent external liquid, water vapor or foam from entering the handle housing 10. Part of the structure of the motor housing 31 can clamp the flange 533 together with the handle housing 10, so that the flange 533 and the handle housing 10 are tightly in contact, thereby improving the sealing performance of the second sleeve 53.

[0064] Specifically, in some embodiments, the outer contour of the second sleeve 53 can match the inner contour of part of the handle housing 10, and the sleeve 531 of the second sleeve 53 can collide with the inner wall of the through hole 11, and the sealing wall 535 and the flange 533 both collide with the inner wall of the handle housing 10 outside the through hole 11. The outer contour diameter of the flange 533 is larger than the contour diameter of the second sleeve 53, so that the sealing wall 535 is formed at the connection between the flange 533 and the sleeve 531, at least part of the outer wall of the sealing wall 535 is in conflict with the handle housing 10, and the inner wall of the sealing wall 535 is in conflict with at least part of the structure of the motor housing 31, and the sealing wall 535 can seal the gap between the handle housing 10 and the motor housing 31. When external liquid or foam flows down, the liquid or foam may partially enter between the sleeve 531 and the inner wall of the through hole 11, and then be blocked by the sealing structure formed between the sealing wall 535 and the handle shell 10. If the sealing structure formed between the sealing wall 535 and the handle shell 10 also cannot block the liquid, the sealing structure formed between the outer wall of the flange 533 and the inner wall of the handle shell 10 can also block the liquid or foam from contacting the structure inside the handle shell 10, thereby improving the sealing effect.

[0065] More specifically, in some embodiments, a plurality of sealing portions 571 are provided on the outer wall of the flange 533 and / or the outer wall of the sealing wall 535. The sealing portions 571 are annular protrusions, and the sealing portions 571 are in contact with the inner wall of the handle shell 10. When at least part of the structure of the sealing sleeve 50 is installed in the through hole 11, the sealing portions 571 can be in contact with the inner wall of the handle shell 10 and deformed, so that the flange 533 and / or the sealing wall 535 are completely sealed with the inner wall of the handle shell 10, thereby improving the sealing performance of the sealing sleeve 50 and preventing external liquid, water vapor or foam from entering the handle shell 10.

[0066] See also Figure 2 and Figure 4 In some embodiments, the electric toothbrush 100 may further include a stopper 70, which can fix the relative position between the sealing sleeve 50 and the motor shaft 33 or the relative position between the sealing sleeve 50 and the handle shell 10. In some embodiments, the stopper 70 is disposed at one end of the motor shell 31 facing the through hole 11 and extends into the sealing sleeve 50. The stopper 70 and the motor shaft 33 jointly clamp the first sleeve 51 to limit the movement of the sealing sleeve 50 relative to the motor shaft 33. When the stopper 70 and the motor shaft 33 clamp the first sleeve 51, the first sleeve 51 will not fall off the motor shaft 33, causing a large deformation of the sealing sleeve 50 as a whole, thereby preventing liquid or foam from entering the motor 30. In other embodiments, the stopper 70 and the handle shell 10 jointly clamp the second sleeve 53 to limit the movement of the sealing sleeve 50 relative to the handle shell 10. When the limiting member 70 and the handle shell 10 clamp the second sleeve 53, the second sleeve 53 and the inner wall of the handle shell 10 are more tightly combined, and the second sleeve 53 will not fall off the handle shell 10, thereby preventing liquid or foam from entering the handle shell 10 and causing damage to the electrical structure.

[0067] Specifically, in some embodiments, the limit member 70 is formed separately from the motor housing 31. When the specifications of the electric toothbrush 100 are different, the sizes of the adapted sealing sleeve 50 and the motor housing 31 will also be different. When the limit member 70 and the motor housing 31 are formed separately, the limit members 70 of different specifications can be installed and adapted to the motor housing 31 respectively. In other embodiments, the limit member 70 is an integrated structure formed by extending the motor housing 31 in a direction close to the through hole 11. When the limit member 70 and the motor housing 31 are an integrated structure, when installing the sealing sleeve 50, the limit member 70 can directly extend into the sealing sleeve 50 to limit the position of the sealing sleeve 50, without the need for secondary installation, and the structure of the electric toothbrush 100 is simpler.

[0068] More specifically, in some embodiments, the position-limiting member 70 includes a supporting portion 71 and a connecting portion 73. The supporting portion 71 and the connecting portion 73 are structures that are sequentially connected along the length direction X of the handle housing 10, and the supporting portion 71 can extend into the gap between the first sleeve 51 and the second sleeve 53 to simultaneously fix the positions of the first sleeve 51, the second sleeve 53 and the connecting wall 55. The connecting portion 73 can carry the supporting portion 71 and fix the supporting portion 71 on the motor housing 31, thereby improving the overall strength of the position-limiting member 70 and preventing the position-limiting member 70 from being broken or damaged. In the case where the outer wall of the first sleeve 51 and the inner wall of the second sleeve 53 are at least partially spaced apart, at least a portion of the supporting portion 71 is disposed in the space between the outer wall of the first sleeve 51 and the inner wall of the second sleeve 53, and the supporting portion 71 can both limit the position of the sealing sleeve 50 relative to the motor 30 and / or the handle housing 10 and support the connecting wall 55. The connecting portion 73 is used to connect the supporting portion 71 and the motor housing 31. In some embodiments, the support portion 71 contacts the outer side wall of the first sleeve 51 to clamp the first sleeve 51 together with the motor shaft 33. When the support portion 71 contacts the outer side wall of the first sleeve 51, the support portion 71 and the motor shaft 33 can clamp the first sleeve 51 so that the first sleeve 51 and the motor shaft 33 are in close contact, and the first sleeve 51 will not fall off the motor shaft 33, causing a large deformation of the sealing sleeve 50 as a whole, thereby preventing liquid or foam from entering the motor 30. In other embodiments, the support portion 71 contacts the inner side wall of the second sleeve 53 to clamp the second sleeve 53 together with the handle shell 10. When the support portion 71 contacts the inner wall of the second sleeve 53, the support portion 71 and the handle shell 10 can clamp the second sleeve 53 so that the second sleeve 53 is in close contact with the handle shell 10. The second sleeve 53 and the inner wall of the handle shell 10 are more tightly combined, and the second sleeve 53 will not fall off the handle shell 10, thereby preventing liquid or foam from entering the handle shell 10 and causing damage to the electrical structure.

[0069] More specifically, in some embodiments, along the length direction X of the handle shell 10, the support portion 71 includes a first end 711 and a second end 713 opposite to each other, the first end 711 of the support portion 71 is a free end, and the second end 713 of the support portion 71 is connected to the connection portion 73. When the first sleeve 51 rotates a certain angle around the length direction X of the handle shell 10 together with the motor shaft 33 under the action of friction, the connection wall 55 will be partially deformed, and the support portion 71 can support the connection wall 55 in the length direction X of the handle shell 10 to prevent the top surface 551 of the connection wall 55 from moving toward the side close to the motor 30, causing the second sleeve 53 to be pulled away from the handle shell 10. In some embodiments, there is a gap between the first end 711 of the support portion 71 and the first surface of the connection wall 55. The connection wall 55 has a certain movable space, but when the connection wall 55 moves to a position in contact with the free end of the support portion 71, the second sleeve 53 still conflicts with the inner wall of the handle shell 10 to avoid affecting the sealing performance of the sealing sleeve 50. In other embodiments, the first end 711 of the support portion 71 contacts the first surface of the connecting wall 55. The support portion 71 and the connecting wall 55 are rigidly supported, and the connecting wall 55 cannot move relative to the handle housing 10.

[0070] Specifically, please combine Figure 5 In some embodiments, the outer side wall of the first sleeve 51 is provided with an abutting portion 573, and the abutting portion 573 is used to abut against the support portion 71. When the abutting portion 573 on the first sleeve 51 abuts against the support portion 71, the support portion 71 can clamp the first sleeve 51 together with the motor shaft 33, and the contact area between the support portion 71 and the first sleeve 51 is small, so that when the support portion 71 is affected by the motor shaft 33 and vibrates, it is not easy to affect the sealing performance of the first sleeve 51. In other embodiments, the inner side wall of the second sleeve 53 is provided with an abutting portion 573, and the abutting portion 573 is used to abut against the support portion 71. When the abutment portion 573 on the second sleeve 53 abuts against the support portion 71, the support portion 71 can clamp the second sleeve 53 together with the handle shell 10. The protruding abutment portion 573 can reduce the gap between the support portion 71 and the first sleeve 51, thereby preventing the support portion 71 from shaking relative to the second sleeve 53 in a direction perpendicular to the length direction X of the handle shell 10, thereby affecting the clamping effect.

[0071] In the description of this specification, the description with reference to the terms "certain embodiments", "in an example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiments or examples are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

[0072] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. An electric toothbrush, characterized in that: include: A handle shell, wherein the handle shell is provided with a through hole; A motor, the motor comprising a motor housing and a motor shaft connected to each other, the motor housing being disposed in the handle housing, and at least a portion of the motor shaft being passed through the through hole; A sealing sleeve, the sealing sleeve comprises a first sleeve body, a second sleeve body and a connecting wall, the first sleeve body is located in the cavity of the second sleeve body, the connecting wall respectively connects the end faces of the first sleeve body and the second sleeve body facing the same direction; the first sleeve body comprises an inner side wall facing the motor shaft, the inner side wall of the first sleeve body is uneven, at least part of the motor shaft is passed through the first sleeve body and partially contacts with the inner side wall of the first sleeve body, the second sleeve body is arranged in the through hole and contacts with the inner side wall of the handle shell, and the sealing sleeve is at least used to seal the gap between the motor shaft and the inner wall of the through hole.

2. The electric toothbrush according to claim 1, characterized in that: The motor shaft is used to rotate relative to the motor shell around the length direction of the handle shell. When the rotation angle of the motor shaft is within the range of a first rotation angle, the first sleeve rotates together with the motor shaft, and the outer wall of the second sleeve abuts against the inner wall of the handle shell.

3. The electric toothbrush according to claim 1, characterized in that: The inner side wall of the first sleeve body includes at least one annular protrusion, at least one of the protrusions is in contact with the motor shaft, and at least a portion of the inner side wall of the first sleeve body is spaced apart from the motor shaft.

4. The electric toothbrush according to claim 3, characterized in that: The inner side wall of the first sleeve body includes a first portion and a second portion spaced apart from each other, the first portion is disposed between any two adjacent protrusions and spaced apart from the motor shaft, and the second portion abuts against the motor shaft.

5. The electric toothbrush according to claim 1, characterized in that: The inner side wall of the first sleeve body comprises a corrugated surface, at least a portion of which is used to abut against the motor shaft.

6. The electric toothbrush according to claim 1, characterized in that: The inner side wall of the first sleeve body comprises a make-away surface and a concave-convex surface connected to each other, at least a part of the concave-convex surface is used to abut against the motor shaft, and the make-away surface is separated from the motor shaft.

7. The electric toothbrush according to claim 1, characterized in that: Along the length direction of the handle shell, the connecting wall includes a top surface and a bottom surface facing each other, the top surface of the connecting wall is flush with the end surface of one end of the handle shell provided with a through hole in the length direction of the handle shell, and the bottom surface of the connecting wall faces the side where the first sleeve and the second sleeve are located.

8. The electric toothbrush according to claim 1, characterized in that: The second housing comprises: a sleeve, one end of which is connected to the first sleeve body via the connecting wall, and an outer side wall of the sleeve abuts against an inner side wall of the through hole; and A flange is arranged along the length direction of the handle shell, the flange is arranged at the other end of the sleeve and is arranged opposite to the connecting wall, the outer wall of the flange is in conflict with the inner wall of the handle shell, and at least part of the structure of the motor shell is in contact with the inner wall of the flange to clamp the flange together with the handle shell.

9. The electric toothbrush according to claim 8, characterized in that: The outer contour diameter of the flange is larger than the contour diameter of the second sleeve, so that a sealing wall is formed at the connection between the flange and the sleeve, at least part of the outer wall of the sealing wall is in conflict with the handle shell, and the inner wall of the sealing wall is in conflict with at least part of the structure of the motor shell, and the sealing wall is used to seal the gap between the handle shell and the motor shell.

10. The electric toothbrush according to claim 9, characterized in that: A plurality of sealing parts are arranged on the outer wall of the flange and / or the outer wall of the sealing wall. The sealing parts are annular protrusions, and the sealing parts are in contact with the inner wall of the handle shell.

11. The electric toothbrush according to claim 1, characterized in that: The electric toothbrush also includes: A limiting member, wherein the limiting member is disposed at one end of the motor housing facing the through hole and extends into the sealing sleeve, and the limiting member and the motor shaft jointly clamp the first sleeve to limit the movement of the sealing sleeve relative to the motor shaft; and / or The limiting member and the handle shell jointly clamp the second sleeve to limit the movement of the sealing sleeve relative to the handle shell.

12. The electric toothbrush according to claim 11, characterized in that: The limiting member and the motor housing are formed separately; or The limiting member is an integrated structure formed by extending the motor housing toward the direction close to the through hole.

13. The electric toothbrush according to claim 11, characterized in that The outer side wall of the first sleeve body is spaced apart from the inner side wall of the second sleeve body, and the limiting member comprises: a support portion, at least a portion of which is disposed in a space between an outer side wall of the first sleeve and an inner side wall of the second sleeve, the support portion being used to limit a position of the sealing sleeve relative to the motor and / or the handle housing; and The connecting portion includes a first end and a second end opposite to each other, the first end of the supporting portion is a free end, and the connecting portion is used to connect the second end of the supporting portion and the motor housing.

14. The electric toothbrush according to claim 13, characterized in that: The support portion contacts the outer side wall of the first sleeve to clamp the first sleeve together with the motor shaft; and / or The support portion contacts the inner side wall of the second sleeve body to clamp the second sleeve body together with the handle shell.

15. The electric toothbrush according to claim 13, characterized in that: Along the length direction of the handle shell, the connecting wall includes a top surface and a bottom surface facing each other, at least a part of the supporting portion is arranged in the interval between the outer wall of the first sleeve body and the inner wall of the second sleeve body for supporting the connecting wall; there is a gap between the first end of the supporting portion and the first surface of the connecting wall; or The first end of the supporting portion contacts the first surface of the connecting wall.

16. The electric toothbrush according to claim 13, characterized in that: The outer side wall of the first sleeve is provided with an abutment portion, and the abutment portion is used to abut against the support portion; and / or An abutment portion is disposed on the inner side wall of the second sleeve body, and the abutment portion is used to abut against the support portion.

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