CN220495093U - Electric toothbrush handle and electric toothbrush - Google Patents

Abstract

The embodiment of the application discloses an electric toothbrush handle and an electric toothbrush, wherein the electric toothbrush handle comprises a handle shell, a motor and a waterproof structure, and the handle shell is provided with an installation cavity and an extension hole communicated with the installation cavity; the motor comprises a motor body and a motor shaft, the motor body is arranged in the mounting cavity, the lower end of the motor shaft is connected with the motor body, and the upper end of the motor shaft extends out of the handle shell through the extending hole; the waterproof structure is sleeved on the periphery of the motor shaft and positioned at the position of the extending hole so as to be clamped between the handle shell and the motor shaft in a sealing way; the waterproof structure comprises a hard supporting piece and an elastic waterproof piece, and the elastic waterproof piece is provided with a first sealing surface for sealing with the inner wall surface of the handle shell or the outer wall surface of the motor shaft; the elastic waterproof piece is injection-molded and wrapped on the periphery of the hard support piece, so that the hard support piece supports the first sealing surface in the normal direction of the first sealing surface. The motor shaft sealing structure of the electric toothbrush handle is not easy to deform and lose efficacy.

Description

Electric toothbrush handle and electric toothbrush

Technical Field

The application relates to the technical field of oral care implements, in particular to an electric toothbrush handle.

Background

The electric toothbrush is widely used because of the advantages of high cleaning efficiency, comfortable and convenient use, etc. The electric toothbrush is characterized in that the motor is arranged in the handle shell, so that a motor shaft of the motor extends out of the handle shell and is connected with the brush head, and the brush head is driven to vibrate at high frequency, so that cleaning is realized. In order to prevent water from entering the handle from the joint of the motor shaft and the handle shell, a silica gel waterproof ring is usually arranged at the joint of the motor shaft and the handle shell at present to seal and prevent water. However, due to high-speed rotation or vibration of the motor shaft, the silicone waterproof ring can be aged and deformed after long-term use, resulting in sealing failure.

The foregoing is merely provided to facilitate an understanding of the principles of the utility model and is not admitted to be prior art.

Disclosure of Invention

In view of the above problems, the present utility model provides an electric toothbrush handle, which aims to solve the technical problem that a motor shaft sealing structure of an electric toothbrush is easy to deform to cause sealing failure.

In order to achieve the above object, the electric toothbrush handle provided by the present utility model comprises a handle housing, a motor and a waterproof structure; wherein,

the handle shell is provided with an installation cavity and an extension hole communicated with the installation cavity;

the motor comprises a motor body and a motor shaft, the motor body is arranged in the mounting cavity, the lower end of the motor shaft is connected with the motor body, and the upper end of the motor shaft extends out of the handle shell through the extending hole;

the waterproof structure is sleeved on the periphery of the motor shaft and positioned at the position of the extending hole so as to be clamped between the handle shell and the motor shaft in a sealing way; the waterproof structure comprises a hard supporting piece and an elastic waterproof piece, wherein the elastic waterproof piece is provided with a first sealing surface used for sealing with the inner wall surface of the handle shell or the outer wall surface of the motor shaft; the elastic waterproof piece is injection-molded and wrapped on the periphery of the hard support piece, so that the hard support piece supports the first sealing surface in the normal direction of the first sealing surface.

In one embodiment, the first sealing surface is provided with a first waterproof convex rib in a protruding mode, and the first waterproof convex rib extends around the circumference of the motor shaft; the hard support piece is arranged corresponding to the first waterproof convex rib in the normal direction of the first sealing surface.

In one embodiment, the rigid support extends in a ring along the circumference of the motor shaft.

In one embodiment, the elastic waterproof piece comprises a sealing cover, wherein the sealing cover comprises a cylinder body and a sealing ring connected to the periphery of the lower end of the cylinder body;

the cylinder body is sleeved on the periphery of the motor shaft and is clamped between the motor shaft and the inner wall surface of the extending hole; the sealing ring is clamped between the motor body and the handle shell in the up-down direction;

the top surface of the sealing ring forms the first sealing surface, and the hard support piece is embedded in the sealing ring and at least partially arranged corresponding to the cylinder body in the up-down direction.

In an embodiment, the elastic waterproof piece further comprises a sealing sleeve, and the sealing sleeve is positioned in the cylinder body and sleeved on the periphery of the motor shaft; the waterproof structure further comprises a clamping piece, and the clamping piece is arranged on the periphery of the sealing sleeve in a surrounding mode so as to clamp the sealing sleeve and the motor shaft.

In one embodiment, the middle part of the upper end wall of the cylinder body is arranged in a downward concave manner; the upper end of the sealing sleeve is abutted against the upper end wall of the first cylinder.

In an embodiment, the sealing sleeve comprises a sleeve part and an abutting convex ring extending outwards from the periphery of the upper end of the sleeve part, the sleeve part is sleeved on the peripheral wall of the motor shaft, and the clamping piece is sleeved on the periphery of the sleeve part and supports the lower wall surface of the abutting convex ring.

In an embodiment, a lower wall surface of the upper end wall of the cylinder body portion is provided with a second waterproof rib in a protruding manner corresponding to the abutting convex ring and/or the sleeve portion, and the second waterproof rib is arranged around the motor shaft.

In an embodiment, the inner peripheral wall of the sealing sleeve is provided with a plurality of third waterproof ribs which are arranged at intervals in the up-down direction, and the plurality of third waterproof ribs are arranged around the motor shaft; the clamping piece is arranged corresponding to a plurality of third waterproof convex ribs in the radial direction of the motor shaft.

In one embodiment, the upper end face of the sealing sleeve is slidably abutted with the lower wall face of the upper end wall of the cylinder body; the sealing sleeve is fixedly connected with the motor shaft so as to drive the sealing sleeve to rotate relative to the sealing cover when the motor shaft rotates around the axis of the motor shaft.

In an embodiment, the hard support is sheet-shaped, and the thickness direction of the hard support is set up in the up-down direction.

In an embodiment, the hard support member is provided with a plurality of mold positioning holes which are arranged around the circumference of the motor shaft at intervals, and the elastic waterproof member is subjected to secondary injection molding and is filled with a part of the mold positioning holes.

In an embodiment, the lower end surface of the sealing ring is provided with a clamping hole corresponding to the mold positioning hole, and the diameter of the clamping hole is larger than that of the mold positioning hole and smaller than that of the peripheral wall of the hard support piece.

In an embodiment, the elastic waterproof piece is made of silica gel, and the hard support piece is made of metal.

The utility model also provides an electric toothbrush, which comprises a brush head assembly and the electric toothbrush handle according to any embodiment, wherein one end of a motor shaft of the electric toothbrush handle, which extends out of a handle shell, is connected with the brush head assembly.

According to the electric toothbrush handle, the elastic waterproof piece is molded and wrapped on the periphery of the hard supporting piece, so that the hard supporting piece can effectively support the elastic waterproof piece, the rigidity of the whole waterproof structure is improved, and the sealing failure caused by ageing and deformation of the silica gel waterproof ring due to high-speed rotation or high-frequency vibration of a motor shaft is avoided; meanwhile, the first sealing surface of the elastic waterproof piece is tightly attached to the inner wall surface of the handle shell and/or the outer wall surface of the motor shaft through the hard supporting piece, so that the sealing reliability of a sealing interface between the first sealing surface of the elastic waterproof piece and the handle shell or the motor shaft can be improved.

In addition, the elastic waterproof piece is molded and wrapped on the periphery of the hard support piece, compared with the elastic waterproof piece supported by the external clamping piece, the connection between the hard support piece and the elastic waterproof piece is more stable and reliable, the whole waterproof structure is more compact, and the occupied space is smaller. Meanwhile, the hard support piece is embedded in the elastic waterproof piece, so that the effective sealing area is not reduced because the elastic waterproof piece is matched and connected with the external clamping piece, and the available sealing area between the elastic waterproof piece and the inner wall surface of the handle shell and between the elastic waterproof piece and the motor shaft is larger, and the overall sealing effect is better.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly introduced below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic view showing the construction of an embodiment of the handle of the electric toothbrush of the present utility model;

FIG. 2 is an angled cross-sectional view of the handle of the electric toothbrush of FIG. 1;

FIG. 3 is an enlarged view of a portion of FIG. 2 at A;

fig. 4 is an exploded view of an embodiment of the waterproof structure of the present utility model;

fig. 5 is a cross-sectional view of the waterproof structure of fig. 4 at an angle after assembly;

FIG. 6 is a schematic view of the seal housing of FIG. 4 from another angle;

fig. 7 is a schematic view of an embodiment of the electric toothbrush of the present utility model.

Reference numerals illustrate:

the achievement of the objects, functional features and advantages of the present utility model will be further described with reference to the accompanying drawings, in conjunction with the embodiments.

Detailed Description

The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present utility model.

It should be noted that, if a directional indication (such as up, down, left, right, front, and rear … …) is involved in the embodiment of the present utility model, the directional indication is merely used to explain the relative positional relationship, movement condition, etc. between the components in a specific posture, and if the specific posture is changed, the directional indication is correspondingly changed.

In addition, if there is a description of "first", "second", etc. in the embodiments of the present utility model, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and/or" as it appears throughout is meant to include three side-by-side schemes, for example, "A and/or B", including the A scheme, or the B scheme, or the scheme where A and B meet at the same time.

The utility model provides an electric toothbrush handle.

In the embodiment of the present utility model, referring to fig. 1 to 5, the electric toothbrush handle 100 includes a handle housing 110, a motor 120, and a waterproof structure 130; wherein the handle housing 110 has a mounting cavity 111 and an extension hole 112 communicating with the mounting cavity 111. The motor 120 includes a motor body 121 and a motor shaft 122, the motor body 121 is mounted in the mounting cavity 111, the lower end of the motor shaft 122 is connected with the motor body 121, and the upper end extends out of the handle housing 110 through the extending hole 112.

The waterproof structure 130 is sleeved on the periphery of the motor shaft 122 and is positioned at the position of the extending hole 112 so as to be clamped between the handle shell 110 and the motor shaft 122 in a sealing manner; the waterproof structure 130 includes a hard support 131 and an elastic waterproof member 140, the elastic waterproof member 140 having a first sealing surface 141 for sealing with an inner wall surface of the handle housing 110 or an outer wall surface of the motor shaft 122; the elastic waterproof member 140 is injection molded and wrapped around the hard support member 131, so that the hard support member 131 supports the first sealing surface 141 in the normal direction of the first sealing surface 141.

In the present embodiment, the handle housing 110 may have a single-layer housing structure or a double-layer housing structure, and is not particularly limited herein. The handle housing 110 may be made of metal, plastic, or the like, and when the handle housing 110 is a double-layer housing, the outer housing of the handle housing 110 may be made of metal, and the inner housing of the handle housing 110 may be made of plastic. The handle housing 110 is formed in an elongated shape extending vertically as a whole. For the convenience of the user's grip, the cross-sectional shape of the handle housing 110 is generally provided in a circular shape, an oval shape, or the like. The upper end of the motor shaft 122 protrudes out of the handle housing 110 through the protruding hole 112 to be connected with the brush head assembly 200, and the brush head assembly 200 is driven to vibrate at high frequency or rotate around an axis by the motor 120.

So that the waterproof structure 130 is sleeved on the periphery of the motor shaft 122 and is clamped between the handle housing 110 and the motor shaft 122, the waterproof structure 130 can seal and waterproof the connection between the motor shaft 122 and the handle housing 110, so that water is prevented from entering the motor 120 from the connection between the motor shaft 122 and the handle housing 110. The elastic waterproof member 140 may be made of an elastic sealing material such as silicone rubber or rubber. The hardness of the hard support 131 is higher than that of the elastic waterproof member 140, and the hard support 131 may be made of a metal material such as steel, iron, or alloy. Optionally, the elastic waterproof member 140 is made of a silica gel material, and the hard supporting member 131 is made of a metal material. The elastic waterproof member 140 forms a sealing surface with the inner wall surface of the handle housing 110 and/or the outer wall surface of the motor shaft 122. The first sealing surface 141 may be a surface extending in the axial direction of the motor shaft 122 or a surface extending in the radial direction of the motor shaft 122.

According to the electric toothbrush handle 100, the elastic waterproof piece 140 is molded and wrapped on the periphery of the hard supporting piece 131, so that the hard supporting piece 131 can effectively support the elastic waterproof piece 140, the rigidity of the whole waterproof structure 130 is improved, and sealing failure caused by ageing and deformation of a silica gel waterproof ring due to high-speed rotation or high-frequency vibration of the motor shaft 122 is avoided; meanwhile, the first sealing surface 141 of the elastic waterproof member 140 is tightly attached to the inner wall surface of the handle housing 110 and/or the outer wall surface of the motor shaft 122 by the hard support member 131, so that the sealing reliability of the sealing interface between the first sealing surface 141 of the elastic waterproof member 140 and the handle housing 110 or the motor shaft 122 can be improved.

In addition, the elastic waterproof member 140 is molded and wrapped around the hard support member 131, so that the connection between the hard support member 131 and the elastic waterproof member 140 is more stable and reliable, and the entire waterproof structure 130 is more compact and occupies less space than the connection supported by the external clamping member. Meanwhile, since the hard supporting piece 131 is embedded in the elastic waterproof piece 140, the effective sealing area is not reduced because the elastic waterproof piece 140 needs to be matched and connected with the external clamping piece, so that the available sealing area between the elastic waterproof piece 140 and the inner wall surface of the handle shell 110 and between the elastic waterproof piece and the motor shaft 122 is larger, and the overall sealing effect is better.

In one embodiment, as shown in fig. 2 to 5, the first sealing surface 141 is provided with a first waterproof bead 142, and the first waterproof bead 142 extends around the circumference of the motor shaft 122; the hard support 131 is disposed corresponding to the first waterproof bead 142 in the normal direction of the first sealing surface 141.

In this embodiment, the number of the first waterproof beads 142 may be set to one or more concentric circles. To improve sealing reliability, the first waterproof bead 142 may optionally be annular extending around the circumference of the motor shaft 122. Through protruding the first waterproof bead 142 of establishing on first sealed face 141, and make hard support 131 correspond first waterproof bead 142 setting in the normal direction of first sealed face 141, then hard support 131 can upwards support and end to first waterproof bead 142 for the laminating between the outer wall surface of first waterproof bead and handle casing 110 or motor shaft 122 is inseparabler, further promotes the waterproof seal reliability of first sealed face 141.

Further, referring to fig. 4, the rigid support member 131 extends along the circumferential direction of the motor shaft 122 in a ring shape. By making the hard support member 131 annular, the hard support member 131 can effectively support the first sealing surface 141 and the first waterproof bead 142 around the circle of the motor shaft 122, thereby further improving the sealing reliability of the sealing interface between the first sealing surface 141 of the elastic waterproof member 140 and the handle housing 110 or the motor shaft 122.

In one embodiment, as shown in fig. 2 to 6, the elastic waterproof member 140 includes a sealing cap 150, and the sealing cap 150 includes a cylindrical body 151 and a sealing ring 152 connected to the outer periphery of the lower end of the cylindrical body 151;

the cylinder 151 is sleeved on the periphery of the motor shaft 122 and is clamped between the motor shaft 122 and the inner wall surface of the extending hole 112; the seal ring 152 is interposed between the motor body 121 and the handle housing 110 in the up-down direction;

the top surface of the sealing ring 152 forms the first sealing surface 141, and the hard support 131 is embedded in the sealing ring 152 and is at least partially disposed corresponding to the cylinder 151 in the up-down direction.

In the present embodiment, the cylindrical body 151 and the seal ring 152 are integrally formed for improving the structural strength. It is understood that the seal ring 152 is provided protruding from the lower end outer peripheral surface of the cylindrical body 151. The cylindrical body 151 is interposed between the motor shaft 122 and the inner wall surface of the protruding hole 112 to waterproof-seal a gap between the outer peripheral wall of the motor shaft 122 and the inner wall surface of the protruding hole 112; that is, the axial direction of the motor shaft 122 is effectively sealed. By sandwiching the seal ring 152 between the motor body 121 and the handle housing 110 in the up-down direction, the elastic waterproof member 140 also radially seals the gap between the handle housing 110 and the motor body 121, further improving the sealing reliability of the elastic waterproof member 140 between the motor 120 and the handle housing 110. And the top surface of the sealing ring 152 forms the first sealing surface 141, the hard support 131 can support the top surface of the sealing ring 152 upwards and support the bottom surface of the sealing ring 152 downwards at the same time, so that the sealing ring 152 is tightly attached to the motor body 121 and the handle housing 110, and the waterproof sealing interface is more reliable. By arranging the hard support 131 at least partially corresponding to the cylindrical body 151 in the vertical direction, the hard support 131 can also play a certain role in supporting the cylindrical body 151, so that the rigidity of the sealing ring 152 and the cylindrical body 151 is improved at the same time, and the deformation failure of the sealing ring 152 and the cylindrical body 151 in long-term use is avoided.

Specifically, referring to fig. 2 to 5, the hard support 131 is in a sheet shape, and the thickness direction of the hard support 131 is set up along the up-down direction. By making the hard support 131 sheet-like and the thickness direction along the up-down direction, the hard support 131 is more easily embedded in the seal ring 152. And the supporting surface of the hard supporting piece 131 is basically parallel to the first sealing surface 141, so that the effective supporting surface of the hard supporting piece 131 can be maximized, the volume of the hard supporting piece 131 is minimized while the hard supporting piece 131 is ensured to support the first sealing surface 141 and the cylinder 151, and the weight of the whole electric toothbrush handle 100 is prevented from being greatly increased due to overlarge volume of the hard supporting piece 131.

Further, referring to fig. 2 to 5, the elastic waterproof member 140 further includes a sealing sleeve 160, and the sealing sleeve 160 is located in the cylinder 151 and sleeved on the periphery of the motor shaft 122; the waterproof structure 130 further includes a clamping member 170, where the clamping member 170 is disposed around the sealing sleeve 160 to clamp the sealing sleeve 160 and the motor shaft 122.

In this embodiment, the sealing sleeve 160 and the sealing cover 150 may be integrally formed, or may be separately formed. The seal cartridge 160 is interposed between the inner wall surface of the cylindrical body 151 and the outer peripheral wall of the motor shaft 122. The clamping member 170 may be a spring or the like. By arranging the clamping member 170 to be sleeved on the periphery of the sleeve so as to clamp the sealing sleeve 160 and the motor shaft 122, on one hand, the sealing sleeve 160 can be prevented from falling off from the driving shaft, and on the other hand, the sleeve can be extruded and radially supported, so that the sealing between the sleeve and the motor shaft 122 is more reliable. It will be appreciated that since there is sufficient space between the cylindrical body 151 and the sealing sleeve 160 without the need for other connection structures therebetween, the space between the cylindrical body 151 and the sealing sleeve 160 can be fully utilized by providing the external clamping member 170 to clamp the sealing sleeve 160 and the motor shaft 122. The sealing ring 152 is axially supported by the hard supporting piece 131, and the sealing sleeve 160 is radially supported by the clamping piece 170, so that the axial and radial sealing interfaces of the whole waterproof structure 130 can be effectively supported, the overall rigidity of the waterproof structure 130 is greatly improved while the overall structure is compact, the occupied space is small and the available sealing area is large, the sealing reliability between the waterproof structure 130 and the handle shell 110 and the motor shaft 122 can be further ensured, the service life of the waterproof structure 130 is prolonged, and sealing failure caused by aging deformation of the waterproof structure 130 in long-term use is avoided.

In an embodiment, as shown in fig. 3 and 5, the middle part of the upper end wall of the cylinder 151 is concavely disposed; the upper end of the sealing sleeve 160 abuts the upper end wall of the first barrel. It will be appreciated that the barrel 151 is exposed through the aperture 112 of the handle housing 110. When the brush head assembly 200 is mounted on the electric toothbrush handle 100, if the middle portion of the upper end wall of the barrel 151 is protruded, the brush rod bottom wall surface of the brush head assembly 200 is not tightly attached to the upper end surface of the handle housing 110, and dirt and bacteria are easily generated between the brush rod bottom wall surface and the upper end surface of the handle housing 110. By making the middle of the upper end wall of the barrel 151 concave downward, the upper end wall of the barrel 151 can be prevented from interfering with the installation of the brush head assembly 200, so that the brush rod bottom wall surface of the brush head assembly 200 can be tightly attached to the upper end surface of the handle housing 110. And through making the upper end butt of seal cover 160 the upper end wall of first barrel, seal cover 160 can carry out certain support to the upper end wall of first barrel, avoids the middle part of the upper end wall of barrel portion 151 to collapse excessively.

Further, referring to fig. 2, 3 and 5, the sealing sleeve 160 includes a sleeve portion 161 and an abutment collar 163 extending outwardly from an upper end periphery of the sleeve portion 161, the sleeve portion 161 is sleeved on an outer peripheral wall of the motor shaft 122, and the clamping member 170 is sleeved on an outer periphery of the sleeve portion 161 and supports a lower wall surface of the abutment collar 163.

In this embodiment, the clamping member 170 is sleeved on the outer periphery of the sleeve portion 161 and supports the lower wall surface of the abutment convex ring 163 upwards, so that the clamping member 170 is fully utilized to support and push the abutment convex ring 163 upwards, and the middle part of the upper end wall of the cylinder portion 151 can be supported, so that the middle part of the upper end wall of the cylinder portion 151 is prevented from being excessively deformed.

Further, as shown in fig. 2, 3, 5 and 6, a lower wall surface of the upper end wall of the cylinder 151 is provided with a second waterproof rib 154 corresponding to the abutment collar 163 and/or the sleeve portion 161, and the second waterproof rib 154 is disposed around the motor shaft 122.

In this embodiment, the sealing sleeve 160 and the sealing cover 150 are of a split structure. The number of the second waterproof beads 154 may be set to one turn or concentric turns may be set. It can be appreciated that, by supporting the abutting convex ring 163 by the clamping member 170 and/or upwardly pressing the second waterproof convex rib 154 by the upper end surface of the sleeve portion 161, the radial seal between the sealing sleeve 160 and the upper end wall of the barrel 151 can be achieved, the waterproof reliability between the sealing sleeve 160 and the sealing cover 150 can be ensured, and the reliability of the entire waterproof structure 130 can be further improved.

In an embodiment, referring to fig. 3 and 5, the inner circumferential wall of the sealing sleeve 160 is provided with a plurality of third waterproof ribs 162 disposed at intervals in the up-down direction, and the plurality of third waterproof ribs 162 are disposed around the motor shaft 122; the clamping member 170 is disposed corresponding to the plurality of third waterproof beads 162 in the radial direction of the motor shaft 122.

In the present embodiment, it is understood that since the sealing sleeve 160 is sleeved on the outer circumferential wall of the motor shaft 122, it is easily detached under the high-frequency vibration of the driving shaft. By protruding the inner peripheral wall of the sealing sleeve 160 with a plurality of third waterproof ribs 162, the friction between the sealing sleeve 160 and the motor shaft 122 can be increased, so that the two are more tightly and firmly matched. And a plurality of third waterproof ribs 162 arranged at intervals in the axial direction of the motor shaft 122 can perform multiple waterproofing in the axial direction, so that the overall waterproof effect is better. The clamping member 170 is disposed corresponding to the third waterproof ribs 162 in the radial direction of the motor shaft 122, so that the clamping member 170 can press the third waterproof ribs 162 against the peripheral wall of the driving shaft, and the axial sealing reliability of the entire motor shaft 122 can be further improved.

Further, as shown in fig. 1 to 3, an upper end surface of the sealing sleeve 160 slidably abuts against a lower wall surface of the upper end wall of the cylinder 151; the sealing sleeve 160 is fixedly connected with the motor shaft 122, so as to drive the sealing sleeve 160 to rotate relative to the sealing cover 150 when the motor shaft 122 rotates around the axis thereof.

In the present embodiment, the cylindrical body 151 of the seal cap 150 may be fixedly coupled to the inner wall surface of the protruding hole 112 by interference, adhesion, or the like. The sealing sleeve 160 may be fixed around the motor shaft 122 by interference fit, glue bonding, etc., so that the sealing sleeve 160 is fixed and non-rotatable relative to the driving shaft. The sealing sleeve 160 and the sealing cover 150 are of a split structure, the upper end surface of the sealing sleeve 160 is slidably abutted against the lower wall surface of the upper end wall of the cylinder 151, so that the sealing sleeve 160 can rotate around the axis along with the motor shaft 122 relative to the sealing cover 150, and compared with the structure of integrating the sealing sleeve 160 and the sealing cover 150, the waterproof structure 130 is prevented from being twisted off, aged and invalid due to rotation along with the driving shaft, and the service life of the waterproof structure 130 is effectively prolonged.

In combination with the foregoing embodiment in which the hard support 131 is in a sheet shape, as shown in fig. 2 to 6, further, a plurality of mold positioning holes 132 are formed on the hard support 131 and are spaced around the circumference of the motor shaft 122, and the elastic waterproof member 140 is injection molded for two times and fills a part of the mold positioning holes 132. The number of mold locating holes 132 can be selected and designed according to actual requirements. Optionally, the number of the mold positioning holes 132 is four, two holes are used for mold positioning, and the other two holes are used for the flexible material to pass through when the elastic waterproof member 140 is injection molded or sleeved on the periphery of the rigid support member 131, so as to increase the bonding strength with the flexible material.

Further, referring to fig. 3 to 6, a clamping hole 153 is formed on the lower end surface of the sealing ring 152 corresponding to the mold positioning hole 132, and the diameter of the clamping hole 153 is larger than the diameter of the mold positioning hole 132 and smaller than the diameter of the outer peripheral wall of the hard support 131. By providing the clamping hole 153 on the lower end surface of the sealing ring 152 corresponding to the mold positioning hole 132, the clamping positioning assembly of the whole waterproof structure 130 can be realized. And by making the diameter of the clamping hole 153 larger than the diameter of the mold positioning hole 132 and smaller than the diameter of the outer peripheral wall of the hard support 131, the assembly reliability of the entire waterproof structure 130 is improved while ensuring the positioning assembly accuracy of the hard support 131.

The present utility model also proposes an electric toothbrush, referring to fig. 7, which includes a brush head assembly 200 and an electric toothbrush handle 100, wherein the specific structure of the electric toothbrush handle 100 refers to the above embodiment, and one end of a motor shaft 122 of the electric toothbrush handle 100 extending out of the handle housing 110 is connected to the brush head assembly 200. Because the electric toothbrush adopts all the technical schemes of all the embodiments, the electric toothbrush has at least all the beneficial effects brought by the technical schemes of the embodiments, and the description is omitted here. To facilitate replacement of the brush head assembly 200, the brush head assembly 200 is removably coupled to the motor shaft 122. The specific structure and form of the brush head assembly 200 may be referred to in the prior art, and will not be described in detail herein.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and are not limiting thereof; although the present application has been described in detail with reference to the foregoing embodiments, one of ordinary skill in the art will appreciate that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not drive the essence of the corresponding technical solutions to depart from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims (15)

1. An electric toothbrush handle, comprising:

the handle shell is provided with an installation cavity and an extension hole communicated with the installation cavity;

the motor comprises a motor body and a motor shaft, the motor body is arranged in the mounting cavity, the lower end of the motor shaft is connected with the motor body, and the upper end of the motor shaft extends out of the handle shell through the extending hole; and

the waterproof structure is sleeved on the periphery of the motor shaft and positioned at the position of the extending hole so as to be clamped between the handle shell and the motor shaft in a sealing way; the waterproof structure comprises a hard supporting piece and an elastic waterproof piece, wherein the elastic waterproof piece is provided with a first sealing surface used for sealing with the inner wall surface of the handle shell or the outer wall surface of the motor shaft; the elastic waterproof piece is injection-molded and wrapped on the periphery of the hard support piece, so that the hard support piece supports the first sealing surface in the normal direction of the first sealing surface.

2. The electric toothbrush handle according to claim 1, wherein the first sealing surface is provided with a first waterproof rib in a protruding manner, and the first waterproof rib extends around the circumference of the motor shaft; the hard support piece is arranged corresponding to the first waterproof convex rib in the normal direction of the first sealing surface.

3. The electric toothbrush handle according to claim 2, wherein the rigid support member extends in a ring shape along a circumferential direction of the motor shaft.

4. The electric toothbrush handle according to any one of claims 1 to 3, wherein the elastic waterproof member comprises a sealing cover including a cylindrical body portion and a sealing ring attached to an outer periphery of a lower end of the cylindrical body portion;

the cylinder body is sleeved on the periphery of the motor shaft and is clamped between the motor shaft and the inner wall surface of the extending hole; the sealing ring is clamped between the motor body and the handle shell in the up-down direction;

the top surface of the sealing ring forms the first sealing surface, and the hard support piece is embedded in the sealing ring and at least partially arranged corresponding to the cylinder body in the up-down direction.

5. The electric toothbrush handle according to claim 4, wherein the elastic waterproof piece further comprises a sealing sleeve, wherein the sealing sleeve is positioned in the cylinder part and sleeved on the periphery of the motor shaft; the waterproof structure further comprises a clamping piece, and the clamping piece is arranged on the periphery of the sealing sleeve in a surrounding mode so as to clamp the sealing sleeve and the motor shaft.

6. The electric toothbrush handle according to claim 5, wherein the middle part of the upper end wall of the barrel part is provided with a downward depression; the upper end of the sealing sleeve is abutted against the upper end wall of the cylinder body.

7. The electric toothbrush handle according to claim 6, wherein the sealing sleeve comprises a sleeve portion and an abutting convex ring extending outwards from the upper end periphery of the sleeve portion, the sleeve portion is sleeved on the outer peripheral wall of the motor shaft, and the clamping piece is sleeved on the outer periphery of the sleeve portion and supports the lower wall surface of the abutting convex ring.

8. The electric toothbrush handle according to claim 7, wherein a lower wall surface of the upper end wall of the cylinder portion is provided with a second waterproof bead corresponding to the abutment collar and/or the sleeve portion, the second waterproof bead being provided around the motor shaft.

9. The electric toothbrush handle according to claim 5, wherein the inner peripheral wall of the sealing sleeve is provided with a plurality of third waterproof ribs which are arranged at intervals in the up-down direction, and the plurality of third waterproof ribs are arranged around the motor shaft; the clamping piece is arranged corresponding to a plurality of third waterproof convex ribs in the radial direction of the motor shaft.

10. The electric toothbrush handle according to claim 9, wherein an upper end surface of the sealing sleeve slidably abuts a lower wall surface of an upper end wall of the barrel portion; the sealing sleeve is fixedly connected with the motor shaft so as to drive the sealing sleeve to rotate relative to the sealing cover when the motor shaft rotates around the axis of the motor shaft.

11. The electric toothbrush handle according to claim 4, wherein the hard support is in a sheet shape, and a thickness direction of the hard support is arranged in an up-down direction.

12. The electric toothbrush handle according to claim 11, wherein the rigid support member is provided with a plurality of mold positioning holes arranged at intervals around the circumference of the motor shaft, and the elastic waterproof member is provided by injection molding and filling part of the mold positioning holes.

13. The electric toothbrush handle according to claim 12, wherein the lower end surface of the seal ring is provided with a clamping hole corresponding to the mold positioning hole, and the diameter of the clamping hole is larger than the diameter of the mold positioning hole and smaller than the diameter of the outer peripheral wall of the hard support.

14. The electric toothbrush handle according to claim 4, wherein the elastic waterproof member is made of a silica gel material, and the hard support member is made of a metal material.

15. An electric toothbrush comprising a brush head assembly and an electric toothbrush handle as claimed in any one of claims 1 to 14, the electric toothbrush handle having a motor shaft connected to the brush head assembly at an end thereof extending beyond the handle housing.