Electric toothbrush

Abstract

The utility model discloses an electric toothbrush. The electric toothbrush comprises a handle shell, a motor assembly and a sealing piece, the handle shell is provided with a containing cavity, and one end of the handle shell is provided with a first through hole communicated with the containing cavity; the motor assembly is contained in the containing cavity and comprises a machine core shell and a motor shaft, and the motor shaft extends out of the machine core shell and penetrates through the first through hole. And the sealing element comprises a first sealing part and a second sealing part which are integrally formed, the first sealing part and the second sealing part are elastic bodies, the first sealing part is clamped between the motor shaft and the hole wall of the first through hole, and the second sealing part is clamped between the inner wall of the movement shell and the inner wall of the handle shell. According to the electric toothbrush, the sealing element can realize sealing when the motor shaft moves, and meanwhile, the sealing element cannot move along with the motor shaft, so that the sealing element is effectively prevented from being damaged by twisting.

Description

Technical Field

[0001] The utility model relates to the technical field of toothbrushes, in particular to an electric toothbrush. Background Art

[0002] Electric toothbrushes have good cleaning effects and are easy to use, and are becoming more and more popular. Electric toothbrushes are used in a watery and humid environment, which places high demands on waterproof technology.

[0003] In the related art, the motor shaft of the electric toothbrush passes through the handle and is connected to the brush head, and a seal needs to be provided between the motor shaft and the handle hole. Usually, a seal is sleeved on the motor shaft, and a spring is hooped outside the seal to achieve a waterproof seal.

[0004] However, as the movement modes of electric toothbrushes become more and more diversified, servo motors that can rotate 360° or bidirectional motors that can swing back and forth and extend and retract have appeared, causing the seal to rotate, swing back and forth or retract along with the motor shaft, which can easily cause the seal to be twisted, causing water to enter the interior of the electric toothbrush, causing the internal electronic components to short-circuit due to the water ingress, and ultimately causing damage to the electric toothbrush. Utility Model Content

[0005] The embodiment of the present application discloses an electric toothbrush, which enables the seal to achieve sealing when the motor shaft moves, and also prevents the seal from moving with the motor shaft, effectively preventing the seal from being twisted.

[0006] In order to achieve the above-mentioned object, the embodiment of the present application discloses an electric toothbrush, comprising:

[0007] A handle housing, wherein the handle housing has a receiving cavity, and one end of the handle housing is provided with a first through hole communicating with the receiving cavity;

[0008] a motor assembly, the motor assembly being accommodated in the accommodating cavity, the motor assembly comprising a movement housing and a motor shaft, the motor shaft extending out of the movement housing and passing through the first through hole; and,

[0009] The sealing member includes a first sealing portion and a second sealing portion which are integrally formed, the first sealing portion and the second sealing portion are both elastomers, the first sealing portion is clamped between the motor shaft and the hole wall of the first through hole, and the second sealing portion is clamped between the movement housing and the inner wall of the handle housing.

[0010] In some possible implementations, the first sealing portion has a second through hole, the motor shaft passes through the second through hole, and the motor shaft is interference fit with the first sealing portion in the second through hole at least in a circumferential direction of the motor shaft.

[0011] In some possible implementations, the first sealing portion is configured to form a dynamic seal with the motor shaft, and the second sealing portion is configured to form a static seal with the movement housing.

[0012] In some possible implementations, a first contact portion is protruding from a hole wall of the second through hole, and the first contact portion is interference fit with the motor shaft.

[0013] In some possible implementations, the first contact portion includes a convex ring arranged along the circumference of the second through hole; and / or,

[0014] There are multiple first contact portions, and the multiple first contact portions are arranged at intervals in the axial direction of the second through hole.

[0015] In some possible implementations, a protruding direction of the first contact portion and a radial cross section of the second through hole form an angle.

[0016] In some possible implementations, the first contact portion has a first end close to the hole wall of the second through hole and a second end away from the hole wall of the second through hole, and the second end is arranged closer to the outer end of the motor shaft along the axial direction of the second through hole than the first end.

[0017] In some possible implementations, a first air-avoiding groove is disposed on a hole wall of the second through hole, and the first air-avoiding groove is disposed adjacent to the first contact portion.

[0018] In some possible implementations, there are a plurality of the first contact portions, there are a plurality of the first air-avoiding grooves, and the plurality of the first contact portions and the plurality of the first air-avoiding grooves are alternately arranged along the axial direction of the second through hole.

[0019] In some possible implementations, the outer side wall of the first sealing portion is provided with a second avoidance groove, the second avoidance groove is provided corresponding to the first contact portion, and the second avoidance groove provides space for the first contact portion to deform toward the outer side surface of the first sealing portion.

[0020] In some possible implementations, the outer wall of the first sealing portion and the first through hole have a clearance fit at least in the circumferential direction of the motor shaft, and a second contact portion is protrudingly provided on the outer wall of the first sealing portion, and the second contact portion and the first through hole have an interference fit.

[0021] In some possible implementations, the second contact portion includes a protruding ring disposed along a circumference of the second through hole.

[0022] In some possible implementations, the first sealing portion includes a first sealing segment and a second sealing segment arranged along the axial direction of the first through hole, the first sealing segment is located on the side of the second sealing segment facing the outer end of the motor shaft, the first sealing segment has an interference fit with the first through hole and the motor shaft, and the second sealing segment has a clearance fit with the first through hole.

[0023] In some possible implementations, an outer end surface of the first sealing portion is flush with an outer end surface of the handle housing.

[0024] In some possible implementations, the first through hole includes a first hole segment and a second hole segment arranged in sequence, the second hole segment is located on the side of the first hole segment facing the movement housing, the first sealing portion is clamped between the hole wall of the first hole segment and the motor shaft, and the second sealing portion is clamped between the hole wall of the second hole segment and the movement housing.

[0025] In some possible implementations, the diameter of the second hole segment is larger than the diameter of the first hole segment, so that a step surface is formed between the first hole segment and the second hole segment;

[0026] The second sealing portion includes a third sealing segment and a fourth sealing segment which are connected to each other, the third sealing segment being clamped between the step surface and the end surface of the movement housing, and / or the fourth sealing segment being clamped between the side wall of the second hole segment and the side surface of the movement housing.

[0027] In some possible implementations, the third sealing segment has a third contact portion protruding from one side facing the step surface and / or one side facing the end surface of the movement housing, and the fourth sealing segment has a third contact portion protruding from one side facing the side wall of the second hole segment and / or one side facing the side surface of the movement housing.

[0028] In some possible implementations, the third contact portion includes a convex ring disposed along the circumference of the second sealing portion.

[0029] In some possible implementations, there are multiple third contact portions, a portion of the multiple third contact portions are located on the third sealing segment, and another portion is located on the fourth sealing segment, and the multiple third contact portions located on the third sealing segment are arranged at radial intervals along the first through hole, and the multiple third contact portions located on the fourth sealing segment are arranged at axial intervals along the first through hole.

[0030] Compared with the prior art, this application has at least the following beneficial effects:

[0031] In the present application, the first sealing portion in the seal is clamped between the motor shaft and the hole wall of the first through hole. The first sealing portion is an elastomer, so that the first sealing portion can be sealed between the motor shaft and the hole wall of the first through hole, effectively preventing external water from entering the accommodating cavity through the gap between the motor shaft and the hole wall of the first through hole, avoiding the short circuit of electronic components such as the motor assembly located in the accommodating cavity due to water entering the accommodating cavity, thereby enabling the electric toothbrush to have better waterproof performance.

[0032] The second sealing part is clamped between the inner wall of the movement housing and the handle housing. The second sealing part is an elastomer, so that the second sealing part can be clamped and sealed between the inner wall of the movement housing and the handle housing, and the second sealing part is integrally formed with the first sealing part, which can prevent the first sealing part from moving with the motor shaft when the motor shaft rotates, swings back and forth, or telescopes, thereby preventing the first sealing part from being twisted due to the movement of the motor shaft. After the electric toothbrush has been used many times or the motor has been turned on many times, the first sealing part can still make the electric toothbrush have good sealing after the motor shaft has rotated many times, thereby effectively improving the service life of the electric toothbrush.

[0033] Furthermore, the second sealing portion is sandwiched between the inner walls of the movement housing and the handle housing, so that the second sealing portion can be sealed between the inner walls of the movement housing and the handle housing, and can also effectively prevent external water from entering the accommodating cavity through the gap between the inner walls of the movement housing and the handle housing, so that the accommodating cavity can form a sealed space, effectively avoiding the situation where electronic components such as motor components located in the accommodating cavity are short-circuited due to water entering the accommodating cavity, thereby enabling the electric toothbrush to have better waterproof performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0035] Figure 1 is a three-dimensional diagram of an electric toothbrush provided in an embodiment of the present application;

[0036] Figure 2 is a cross-sectional view of an electric toothbrush without a toothbrush head installed provided by an embodiment of the present application;

[0037] Figure 3 yes Figure 2 The first enlarged view at position A in the middle;

[0038] Figure 4 yes Figure 2 The second enlarged view at position A in the middle;

[0039] Figure 5 is a cross-sectional view of a first sealing member provided in an embodiment of the present application;

[0040] Figure 6 is a cross-sectional view of a second sealing member provided in an embodiment of the present application;

[0041] Figure 7 is a three-dimensional diagram of a first sealing member provided in an embodiment of the present application;

[0042] Figure 8 It is a stereoscopic diagram of the second sealing member provided in the embodiment of the present application.

[0043] Description of reference numerals:

[0044] 1-handle housing; 11-first through hole; 111-first hole section; 112-second hole section; 113-step surface; 12-accommodating chamber; 2-motor assembly; 21-motor shaft; 22-movement housing; 3-seal; 3a-first sealing portion; 31-second through hole; 32-first contact portion; 33-first air avoidance groove; 34-second air avoidance groove; 35-second contact portion; 36a-first sealing section; 36b-second sealing section; 3b-second sealing portion; 37a-third sealing section; 37b-fourth sealing section; 38-third contact portion;

[0045] 10-Electric toothbrush; 110-Toothbrush head. DETAILED DESCRIPTION

[0046] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0047] In the present invention, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inside", "outside", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings. These terms are mainly used to better describe the present invention and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0048] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those skilled in the art, the specific meanings of these terms in this utility model can be understood according to specific circumstances.

[0049] In addition, the terms "installed", "set", "provided with", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0050] In addition, the terms "first", "second", etc. are mainly used to distinguish different devices, elements or components (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance and quantity of the indicated devices, elements or components. Unless otherwise specified, "plurality" means two or more.

[0051] An embodiment of the present application discloses an electric toothbrush, which enables the seal to achieve sealing when the motor shaft moves, and also prevents the seal from moving along with the motor shaft, thereby effectively preventing the seal from being twisted.

[0052] The technical solution of the present application will be described in detail below with reference to specific embodiments and drawings.

[0053] The present application embodiment provides an electric toothbrush, such as Figure 1-Figure 4 As shown, the electric toothbrush 10 includes a handle housing 1, a motor assembly 2 and a sealing member 3. The handle housing 1 has a receiving cavity 12, and one end of the handle housing 1 is provided with a first through hole 11 communicating with the receiving cavity 12; the motor assembly 2 is accommodated in the receiving cavity 12, and the motor assembly 2 includes a core housing 22 and a motor shaft 21, and the motor shaft 21 extends out of the core housing 22 and passes through the first through hole 11; and the sealing member 3 includes an integrally formed first sealing portion 3a and a second sealing portion 3b, both of which are elastic bodies, the first sealing portion 3a is sandwiched between the motor shaft 21 and the hole wall of the first through hole 11, and the second sealing portion 3b is sandwiched between the core housing 22 and the inner wall of the handle housing 1.

[0054] In this embodiment, the first sealing portion 3a in the sealing member 3 is clamped between the motor shaft 21 and the hole wall of the first through hole 11. The first sealing portion 3a is an elastomer, so that the first sealing portion 3a can be sealed between the motor shaft 21 and the hole wall of the first through hole 11, effectively preventing external water from entering the accommodating cavity 12 through the gap between the motor shaft 21 and the hole wall of the first through hole 11, and avoiding the short circuit of electronic components such as the motor assembly 2 located in the accommodating cavity 12 due to water entering the accommodating cavity 12, thereby enabling the electric toothbrush 10 to have better waterproof performance.

[0055] The second sealing portion 3b is clamped between the inner wall of the movement housing 22 and the handle housing 1. The second sealing portion 3b is an elastomer, so that the second sealing portion 3b can be clamped and sealed between the inner wall of the movement housing 22 and the handle housing 1, and the second sealing portion 3b is integrally formed with the first sealing portion 3a, which can prevent the first sealing portion 3a from moving with the motor shaft 21 when the motor shaft 21 rotates, swings back and forth, or telescopes, thereby preventing the first sealing portion 3a from being twisted due to the movement of the motor shaft 21. After the electric toothbrush 10 has been used many times or the motor has been turned on many times, the first sealing portion 3a can still make the electric toothbrush 10 have good sealing performance after the motor shaft 21 has rotated many times, thereby effectively improving the service life of the electric toothbrush 10.

[0056] In addition, the second sealing portion 3b is sandwiched between the inner wall of the movement housing 22 and the handle housing 1, so that the second sealing portion 3b can be sealed between the inner wall of the movement housing 22 and the handle housing 1, and can also effectively prevent external water from entering the accommodating cavity 12 through the gap between the inner wall of the movement housing 22 and the handle housing 1, so that the accommodating cavity 12 can form a sealed space, and effectively avoid the situation where the electronic components such as the motor assembly 2 located in the accommodating cavity 12 are short-circuited due to water entering the accommodating cavity 12, thereby enabling the electric toothbrush 10 to have better waterproof performance.

[0057] The material of the first sealing portion 3a in the sealing member 3 can be silicone, rubber, etc., so that the first sealing portion 3a can produce elastic deformation, so that the first sealing portion 3a can be easily sleeved on the motor shaft 21, which is convenient for installation. Similarly, the material of the second sealing portion 3b can also be silicone, rubber, etc., which is not limited here.

[0058] The portion of the motor shaft 21 located outside the handle housing 1 is used to connect to the toothbrush head 110 .

[0059] Alternatively, if Figure 3 and Figure 4As shown, the first sealing portion 3 a has a second through hole 31 , the motor shaft 21 passes through the second through hole 31 , and the motor shaft 21 is interference fit with the first sealing portion 3 a in the second through hole 31 at least in the circumferential direction of the motor shaft 21 .

[0060] In this way, the first sealing portion 3a can seal the portion of the motor shaft 21 located in the second through hole 31, and when the motor shaft 21 moves, the first sealing portion 3a can still seal the motor shaft 21, thereby effectively preventing external water from entering the accommodating chamber 12 through the gap between the first sealing portion 3a and the motor shaft 21.

[0061] It should be explained that the interference fit between the motor shaft 21 and the first sealing portion 3a in the second through hole 31 means that the aperture of the second through hole 31 is slightly smaller than the shaft diameter of the motor shaft 21 in the second through hole 31. For example, the aperture of the second through hole 31 may be 1 mm, 1.5 mm, 2 mm, 3 mm, etc. smaller than the shaft diameter of the motor shaft 21 in the second through hole 31.

[0062] As mentioned above, when the first sealing portion 3a and the motor shaft 21 are partially interference fit in the second through hole 31, the fitting relationship between the first sealing portion 3a and the first through hole 11 can be at least one of a normal fit, an interference fit or a clearance fit, and is not limited here. As long as the first sealing portion 3a can be clamped between the motor shaft 21 and the hole wall of the first through hole 11 when assembled between the motor shaft 21 and the hole wall of the first through hole 11, it will be sufficient.

[0063] In addition, the motor shaft 21 has an interference fit with the first sealing portion 3a in the second through hole 31 at least in the circumferential direction of the motor shaft 21. The second through hole 31 may have a circle of protrusions arranged around the hole wall, and the first sealing portion 3a has an interference fit with the motor shaft 21 through the circle of protrusions arranged around the hole wall. Alternatively, a plurality of protrusions may be rotatably arranged on the hole wall of the second through hole 31, and the plurality of protrusions at least partially overlap with each other in the radial cross-section of the second through hole 31, and the first sealing portion 3a has an interference fit with the motor shaft 21 through the plurality of rotatably arranged protrusions. Of course, the interference fit of the motor shaft 21 in the second through hole 31 with the first sealing portion 3a at least in the circumferential direction of the motor shaft 21 may also be implemented in other ways, which are not limited here.

[0064] Optionally, the first sealing portion 3 a is configured to form a dynamic seal with the motor shaft 21 , and the second sealing portion 3 b is configured to form a static seal with the movement housing 22 .

[0065] In this way, the first sealing portion 3a can not only provide waterproof sealing for the stationary motor shaft 21, but also provide waterproof sealing for the moving motor shaft 21, and the second sealing portion 3b can be statically sealed between the movement housing 22 and the handle housing 1, so that the first sealing portion 3a can still be stationary relative to the handle housing 1 when the motor shaft 21 moves, further preventing the first sealing portion 3a from being twisted, and effectively improving the waterproof effect of the electric toothbrush 10.

[0066] It should be explained that the above-mentioned dynamic seal means that when the motor shaft 21 and the first seal part 3a are in relative motion, the first seal part 3a can also provide a waterproof seal to the motor shaft 21. The above-mentioned static seal means that the second seal part 3b and the movement housing 22 are stationary relative to each other, and the second seal part 3b can provide a waterproof seal to the movement housing 22.

[0067] Alternatively, if Figure 3-Figure 6 As shown, a first contact portion 32 is protruding from the hole wall of the second through hole 31 , and the first contact portion 32 is interference fit with the motor shaft 21 .

[0068] Therefore, the motor shaft 21 can be waterproofly sealed through the first contact portion 32, and the structure is simple and easy to implement.

[0069] Among them, the first contact portion 32 can have multiple implementation methods. In one possible implementation method, the first contact portion 32 may include a plurality of protrusions, and the plurality of protrusions are arranged on the hole wall of the second through hole 31 around the central axis of the second through hole 31, and the plurality of protrusions are interference fit with the motor shaft 21.

[0070] In another possible implementation, the first contact portion 32 includes a protruding ring disposed along the circumference of the second through hole 31 .

[0071] Therefore, the motor shaft 21 can be sealed by a first contact portion 32 , which reduces the structural complexity of the first contact portion 32 and makes the first contact portion 32 easy to implement.

[0072] The cross-sectional shape of the convex ring may be any one of semicircular, trapezoidal, rectangular, square, etc., which is not limited here.

[0073] In addition, the number of the first contact portions 32 may be plural, and the plurality of first contact portions 32 are arranged at intervals in the axial direction of the second through hole 31 .

[0074] Therefore, the motor shaft 21 can be waterproofly sealed by the multiple first contact portions 32, further improving the waterproof sealing effect of the motor shaft 21.

[0075] It can be understood that the plurality of first contact portions 32 are arranged at intervals along the axial direction of the second through hole 31, wherein the spacing between each two adjacent first contact portions 32 is the same, or the spacing between each two adjacent first contact portions 32 is not equal, or the spacing between two adjacent first contact portions 32 in some parts is the same, and the spacing between two adjacent first contact portions 32 in other parts is different. This is not limited here and can be set specifically according to actual conditions.

[0076] The number of the first contact portions 32 may be two, three or more, which is not limited here.

[0077] In addition, the first contact portion 32 may extend in a variety of directions. In one possible extending direction, Figure 5 As shown, the first contact portion 32 can extend along the radial direction of the second through hole 31, so that when the first contact portion 32 is squeezed by the motor shaft 21, it can only produce extrusion deformation along the radial direction of the second through hole 31, so that the portion of the hole wall of the second through hole 31 corresponding to the first contact portion 32 can also only produce extrusion deformation radially outward of the second through hole 31, that is, the position where the first contact portion 32 is connected to the hole wall of the second through hole 31 is only subjected to extrusion force, so that the position where the first contact portion 32 is connected to the hole wall of the second through hole 31 is not prone to tearing, twisting, etc.

[0078] In another possible extension direction of the first contact portion 32, such as Figure 6 As shown, the protruding direction of the first contact portion 32 and the radial cross section of the second through hole 31 form an angle.

[0079] It should be explained that the radial cross section of the second through hole 31 mentioned above refers to a plane parallel to the radial direction of the second through hole 31 and perpendicular to the axial direction of the second through hole 31 .

[0080] Therefore, the first contact portion 32 can be deformed radially along the second through hole 31 and axially along the second through hole 31 when squeezed by the motor shaft 21, so that when the motor shaft 21 rotates at a larger angle or makes telescopic movements, the first contact portion 32 can have a better sealing effect on the motor shaft 21, thereby enabling the first contact portion 32 to have a better dynamic sealing effect on the motor shaft 21.

[0081] The angle between the protruding direction of the first contact portion 32 and the radial cross section of the second through hole 31 can be any angle of 30°, 45°, 50°, etc., which is not limited here.

[0082] In addition, the end surface of the first contact portion 32 close to the motor shaft 21 can be an arc surface to reduce the contact area between the first contact portion 32, reduce the friction resistance between the first contact portion 32 and the motor shaft 21, and thus reduce the wear of the first contact portion 32; it can also be a plane, so that the first contact portion 32 has a larger sealing area for the motor shaft 21, effectively improving the sealing effect on the motor shaft 21; of course, the end surface of the first contact portion 32 close to the motor shaft 21 can also be other shapes, which are not limited here.

[0083] Optionally, the first contact portion 32 has a first end close to the hole wall of the second through hole 31 and a second end away from the hole wall of the second through hole 31 , and the second end is arranged closer to the outer end of the motor shaft 21 along the axial direction of the second through hole 31 than the first end.

[0084] Thus, the first contact portion 32 can be easily deformed toward the outer end of the motor shaft 21, so that it can be more labor-saving when the first sealing portion 3a is sleeved on the motor shaft 21, and the sealing position of the first contact portion 32 to the motor shaft 21 can be closer to the outer end of the motor shaft 21, so that the first contact portion 32 can have a better sealing effect on the motor shaft 21.

[0085] Among them, the cross-sectional area of ​​the first end can be larger than the cross-sectional area of ​​the second end. Furthermore, the first end and the hole wall of the second through hole 31 can be smoothly transitioned to each other, so that the first contact portion 32 and the hole wall of the second through hole 31 can have a larger connection area, thereby making the connection between the first contact portion 32 and the hole wall of the second through hole 31 can be more firm.

[0086] Of course, in other embodiments, the second end may be arranged farther away from the outer end of the motor shaft 21 along the axial direction of the second through hole 31 than the first end, which is not limited here.

[0087] Alternatively, if Figure 3-Figure 6 As shown, a first avoidance groove 33 is disposed on the hole wall of the second through hole 31 , and the first avoidance groove 33 is disposed adjacent to the first contact portion 32 .

[0088] Thus, the second avoidance groove 34 can provide the first contact portion 32 with a deformation space along the axial direction of the second through hole 31, so that the first sealing portion 3a can be sleeved on the motor shaft 21 with less effort, and when the motor shaft 21 makes a telescopic movement, the first contact portion 32 can be effectively prevented from moving together with the motor shaft 21, so that the effect of preventing the seal 3 from moving together with the motor shaft 21 is better; at the same time, the axial area of ​​the first contact portion 32 along the second through hole 31 can be effectively reduced, and the contact area between the first contact portion 32 and the motor shaft 21 is reduced, so that the friction resistance between the motor shaft 21 and the first contact portion 32 can be reduced, and then the wear of the first contact portion 32 can be effectively reduced.

[0089] The first avoidance groove 33 may be an annular groove arranged along the axial direction of the second through hole 31 , or may be a plurality of grooves arranged around the central axis of the second through hole 31 , which is not limited here.

[0090] like Figure 5 and Figure 6 As shown, there are multiple first contact portions 32 and multiple first avoidance grooves 33 , and the multiple first contact portions 32 and the multiple first avoidance grooves 33 are alternately arranged along the axial direction of the second through hole 31 .

[0091] Thus, each first contact portion 32 can have a deformation space along the axial direction of the second through hole 31 , and the first sealing portion 3 a can also have a better dynamic sealing effect on the motor shaft 21 .

[0092] The number of the first contact portions 32 may be two, three or more, which is not limited here. The number of the first avoidance grooves 33 may be the same as the number of the first contact portions 32, or the number of the first avoidance grooves 33 may be one more than the number of the first contact portions 32, so that the first avoidance grooves 33 are adjacently arranged on both sides of each first contact portion 32, so that each first contact portion 32 has deformation space on both sides along the axial direction of the second through hole 31, so that when the motor shaft 21 is telescopic, each first contact portion 32 is not easy to move with the motor shaft 21.

[0093] Alternatively, if Figure 3-Figure 5 As shown, the outer wall of the first sealing portion 3a is provided with a second avoidance groove 34, and the second avoidance groove 34 is arranged corresponding to the first contact portion 32, and the second avoidance groove 34 provides space for the first contact portion 32 to deform toward the outer side of the first sealing portion 3a.

[0094] Therefore, the second avoidance groove 34 can provide the first contact portion 32 with deformation space in the radial direction of the second through hole 31, thereby reducing the squeezing force between the motor shaft 21 and the first contact portion 32, thereby reducing the friction resistance between the motor shaft 21 and the first contact portion 32, so that the first contact portion 32 can effectively reduce the wear of the first contact portion 32 while having a better dynamic seal with the motor shaft 21; and, it can also make it easier to save effort when the first sealing portion 3a is sleeved on the motor shaft 21, thereby facilitating the installation of the seal 3.

[0095] Among them, the second avoidance groove 34 can be an annular groove arranged along the axial direction of the second through hole 31, or it can be a plurality of grooves arranged around the central axis of the second through hole 31. As long as it can be arranged corresponding to the first contact part 32 to provide deformation space for the first contact part 32, it is not limited here.

[0096] In some embodiments, Figure 3-Figure 6 As shown, the outer wall of the first sealing portion 3a is clearance-matched with the first through hole 11 at least in the circumferential direction of the motor shaft 21 , and a second contact portion 35 is protrudingly provided on the outer wall of the first sealing portion 3a , and the second contact portion 35 is interference-fitted with the first through hole 11 .

[0097] Therefore, by the clearance fit between the outer wall of the first sealing portion 3a and the first through hole 11 at least in the circumferential direction of the motor shaft 21, a deformation space can be provided for the first sealing portion 3a when squeezed by the motor shaft 21, thereby reducing the friction resistance between the first sealing portion 3a and the motor shaft 21. Therefore, the first sealing portion 3a not only has a better dynamic seal for the motor shaft 21, but also effectively reduces the resistance encountered by the motor shaft 21 during rotation or telescopic movement.

[0098] Furthermore, through the interference fit between the second contact portion 35 and the first through hole 11, the first sealing portion 3a can seal the first through hole 11, effectively preventing external water from entering the accommodating cavity 12 through the gap between the first sealing portion 3a and the first through hole 11, and avoiding short circuits of components such as the motor assembly 2 in the accommodating cavity 12 caused by water entering the accommodating cavity 12, thereby enabling the electric toothbrush 10 to have better waterproof performance.

[0099] Alternatively, if Figure 5 and Figure 8 As shown, the second contact portion 35 includes a protruding ring disposed along the circumference of the second through hole 31 .

[0100] Therefore, the motor shaft 21 can be sealed by only one second contact portion 35 , which reduces the structural complexity of the second contact portion 35 and makes the second contact portion 35 easy to implement.

[0101] The cross-sectional shape of the second contact portion 35 can be any one of semicircular, trapezoidal, rectangular, square, etc., which is not limited here.

[0102] There may be a plurality of second contact portions 35 , which are spaced apart in the axial direction of the second through hole 31 , so as to waterproofly seal the motor shaft 21 through the plurality of first contact portions 32 , thereby further improving the waterproof sealing effect of the motor shaft 21 .

[0103] In addition, the second contact portion 35 may also be implemented in other ways. For example, the second contact portion 35 may also include a plurality of protrusions arranged around the circumference of the second through hole 31 , which is not limited here.

[0104] In other embodiments, Figure 3-Figure 6 As shown, the first sealing portion 3a includes a first sealing section (such as Figure 5The second sealing section (shown in the dashed box) 36a and the second sealing section (shown in the dashed box) Figure 5 As shown in the dotted box) 36b, the first sealing section 36a is located on the side of the outer end of the second sealing section 36b facing the motor shaft 21, the first sealing section 36a has an interference fit with the first through hole 11 and an interference fit with the motor shaft 21, and the second sealing section 36b has a clearance fit with the first through hole 11.

[0105] In this way, the portion of the first sealing portion 3a close to the outer end of the motor shaft 21 can seal the first through hole 11 and the motor shaft 21, effectively preventing external water from entering the accommodating cavity 12 through the gap between the first sealing portion 3a and the first through hole 11, and the gap between the first sealing portion 3a and the motor shaft 21, thereby avoiding short circuits of components such as the motor assembly 2 in the accommodating cavity 12 caused by water entering the accommodating cavity 12, thereby enabling the electric toothbrush 10 to have better waterproof performance.

[0106] Among them, when the first contact portion 32 is provided on the first sealing portion 3a, the first contact portion 32 can be provided on the second sealing segment 36b, so that the gap between the second sealing segment 36b and the first through hole 11 can provide a certain space for the radial deformation of the first contact portion 32 along the second through hole 31, so that the first contact portion 32 can have a better dynamic seal for the motor shaft 21 while effectively preventing the rotation of the motor shaft 21 from being affected due to the large friction resistance between the first contact portion 32 and the motor shaft 21.

[0107] In some embodiments, Figure 3 and Figure 4 As shown, the outer end surface of the first sealing portion 3 a is flush with the outer end surface of the handle housing 1 .

[0108] Thus, dirt accumulation due to unevenness between the outer end surface of the first sealing portion 3a and the outer end surface of the handle housing 1 can be effectively prevented, so that the electric toothbrush 10 is easy to clean.

[0109] It should be explained that the outer end surface of the first sealing portion 3a is the end surface of the first sealing portion 3a facing the outer end of the motor shaft 21. The outer end surface of the handle housing 1 is the end surface of the handle housing 1 facing the outer end of the motor shaft 21.

[0110] It is also explained that the outer end face of the first sealing portion 3a mentioned above is flush with the outer end face of the handle shell 1, which means that the outer end face of the first sealing portion 3a and the outer end face of the handle shell 1 are approximately located in the same plane, that is, the outer end face of the first sealing portion 3a and the outer end face of the handle shell 1 can be located in the same plane, or the outer end face of the first sealing portion 3a is slightly lower than the outer end face of the handle shell 1, such as the outer end face of the first sealing portion 3a can be 2 mm lower than the outer end face of the handle shell 1, or the outer end face of the first sealing portion 3a is slightly higher than the outer end face of the handle shell 1, such as the outer end face of the first sealing portion 3a can be 2 mm higher than the outer end face of the handle shell 1, and this is not limited here.

[0111] The above-mentioned second sealing portion 3b is clamped between the movement housing 22 and the inner wall of the handle housing 1. The second sealing portion 3b can be clamped between the movement housing 22 and the cavity wall of the accommodating cavity 12, or the second sealing portion 3b can be clamped between the movement housing 22 and the hole wall of the first through hole 11, which is not limited here.

[0112] Alternatively, if Figure 3 and Figure 4 As shown, the first through hole 11 includes a first hole segment 111 and a second hole segment 112 arranged in sequence, the second hole segment 112 is located on the side of the first hole segment 111 facing the movement housing 22, the first sealing portion 3a is clamped between the hole wall of the first hole segment 111 and the motor shaft 21, and the second sealing portion 3b is clamped between the hole wall of the second hole segment 112 and the movement housing 22.

[0113] In this way, the second sealing portion 3b can form a static seal with the movement housing 22 and the hole wall of the second hole section 112, so that the electric toothbrush 10 can have a better sealing effect. At the same time, the second seal will not move with the motor shaft 21 when the motor shaft 21 moves, so that the first sealing portion 3a integrally formed with the second sealing portion 3b is not easy to move with the motor shaft 21, further preventing the seal 3 from being twisted.

[0114] Among them, the apertures of the first hole segment 111 and the second hole segment 112 can be the same, so that the structure of the first through hole 11 is simple and easy to implement, or they can be different, so that the first hole segment 111 and the second hole segment 112 with different apertures can play a certain limiting role in the installation of the seal 3, thereby facilitating the installation of the seal 3. The specific setting can be made according to actual conditions and is not limited here.

[0115] Alternatively, if Figure 3-Figure 6As shown, the aperture of the second hole section 112 is larger than that of the first hole section 111, so that a step surface 113 is formed between the first hole section 111 and the second hole section 112; the second sealing portion 3b includes a third sealing section 37a and a fourth sealing section 37b connected to each other. The third sealing section 37a is sandwiched between the step surface 113 and the end surface of the movement housing 22; or the fourth sealing section 37b is sandwiched between the side wall of the second hole section 112 and the side surface of the movement housing 22; or the third sealing section 37a is sandwiched between the step surface 113 and the end surface of the movement housing 22, and the fourth sealing section 37b is sandwiched between the side wall of the second hole section 112 and the side surface of the movement housing 22.

[0116] In this way, the second sealing portion 3b can form an end face seal between the step surface 113 and the end face of the movement housing 22, and form a cylindrical seal between the side wall of the second hole section 112 and the side face of the movement housing 22, so that the sealing effect of the second sealing portion 3b can be better. At the same time, the second sealing portion 3b can be clamped more firmly, further preventing the seal 3 from moving with the movement of the motor shaft 21.

[0117] The step surface 113 may be a horizontal surface parallel to the radial direction of the first through hole 11 , or may be an inclined surface having a certain angle with the radial direction of the first through hole 11 , which is not limited here.

[0118] like Figure 3-Figure 6 As shown, a third contact portion 38 is protruding from the third sealing segment 37a on one side facing the step surface 113 and / or on one side facing the end surface of the movement housing 22, and a third contact portion 38 is protruding from the fourth sealing segment 37b on one side facing the side wall of the second hole segment 112 and / or on one side facing the side of the movement housing 22.

[0119] Thus, the clamping deformation of the second sealing portion 3b can be effectively increased, the sealing effect of the second sealing portion 3b is further improved, and the second sealing portion 3b can be clamped more firmly, further preventing the seal 3 from moving with the movement of the motor shaft 21.

[0120] Among them, the third sealing segment 37a has a third contact portion 38 protruding from the side facing the step surface 113; or, the third sealing segment 37a has a third contact portion 38 protruding from the side facing the end surface of the movement housing 22; or, the third sealing segment 37a has a third contact portion 38 protruding from both the side facing the step surface 113 and the side facing the end surface of the movement housing 22, which is not limited here.

[0121] A third contact portion 38 is protrudingly provided on a surface of the side wall of the fourth sealing segment 37b facing the second hole segment 112; or, a third contact portion 38 is protrudingly provided on a surface of the fourth sealing segment 37b facing the side surface of the movement housing 22; or, a third contact portion 38 is protrudingly provided on both a surface of the side wall of the fourth sealing segment 37b facing the second hole segment 112 and a surface of the side surface of the movement housing 22.

[0122] Alternatively, if Figure 5-Figure 8 As shown, the third contact portion 38 includes a protruding ring provided along the circumference of the second sealing portion 3b.

[0123] Therefore, the structure of the third contact portion 38 can be relatively simple and easy to implement, thereby reducing the difficulty of manufacturing the second sealing portion 3b.

[0124] The cross-sectional shape of the third contact portion 38 may be substantially the same as the cross-sectional shape of the first contact portion 32 . For details, please refer to the above description, which will not be described in detail here.

[0125] Of course, in other embodiments, the third contact portion 38 may also include a plurality of protrusions arranged along the circumference of the second sealing portion 3b, which is not limited here.

[0126] In addition, if Figure 5-Figure 8 As shown, there are multiple third contact portions 38, a portion of the multiple third contact portions 38 are located on the third sealing segment 37a, and another portion is located on the fourth sealing segment 37b, and the multiple third contact portions 38 located on the third sealing segment 37a are arranged at radial intervals along the first through hole 11, and the multiple third contact portions 38 located on the fourth sealing segment 37b are arranged at axial intervals along the first through hole 11.

[0127] Thus, the third sealing segment 37a and the fourth sealing segment 37b can both have a larger clamping deformation, so that the third sealing segment 37a and the fourth seal can both have a better sealing effect. At the same time, the third sealing segment 37a and the fourth sealing segment 37b can both be clamped more firmly, further preventing the seal 3 from moving with the movement of the motor shaft 21.

[0128] The number of the third contact portions 38 may be two, three or more, which is not limited here.

[0129] The cross-sectional areas of the plurality of third contact portions 38 may be the same or different, which is not limited here.

[0130] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. An electric toothbrush, characterized in that: include: A handle housing, wherein the handle housing has a receiving cavity, and one end of the handle housing is provided with a first through hole communicating with the receiving cavity; a motor assembly, the motor assembly being accommodated in the accommodating cavity, the motor assembly comprising a movement housing and a motor shaft, the motor shaft extending out of the movement housing and passing through the first through hole; and, The sealing member includes a first sealing portion and a second sealing portion which are integrally formed, the first sealing portion and the second sealing portion are both elastomers, the first sealing portion is clamped between the motor shaft and the hole wall of the first through hole, and the second sealing portion is clamped between the movement housing and the inner wall of the handle housing.

2. The electric toothbrush according to claim 1, characterized in that: The first sealing portion has a second through hole, the motor shaft is inserted into the second through hole, and the motor shaft is interference-fitted with the first sealing portion in the second through hole at least in a circumferential direction of the motor shaft.

3. The electric toothbrush according to claim 2, characterized in that: The first sealing portion is configured to form a dynamic seal with the motor shaft, and the second sealing portion is configured to form a static seal with the movement housing.

4. The electric toothbrush according to claim 3, characterized in that: A first contact portion is protruding from the hole wall of the second through hole, and the first contact portion is interference fit with the motor shaft.

5. The electric toothbrush according to claim 4, characterized in that: The first contact portion includes a convex ring arranged along the circumference of the second through hole; and / or, There are multiple first contact portions, and the multiple first contact portions are arranged at intervals in the axial direction of the second through hole.

6. The electric toothbrush according to claim 4, characterized in that: The protruding direction of the first contact portion and the radial cross section of the second through hole form an included angle.

7. The electric toothbrush according to claim 6, characterized in that: The first contact portion has a first end close to the hole wall of the second through hole and a second end away from the hole wall of the second through hole. The second end is arranged closer to the outer end of the motor shaft along the axial direction of the second through hole than the first end.

8. The electric toothbrush according to claim 4, characterized in that: A first avoidance groove is disposed on the hole wall of the second through hole, and the first avoidance groove is disposed adjacent to the first contact portion.

9. The electric toothbrush according to claim 8, characterized in that: There are a plurality of the first contact portions, a plurality of the first air-avoiding grooves, and the plurality of the first contact portions and the plurality of the first air-avoiding grooves are alternately arranged along the axial direction of the second through hole.

10. The electric toothbrush according to claim 4, characterized in that: The outer side wall of the first sealing portion is provided with a second avoidance groove, the second avoidance groove is provided corresponding to the first contact portion, and the second avoidance groove provides a space for the first contact portion to deform toward the outer side surface of the first sealing portion.

11. The electric toothbrush according to claim 2, characterized in that: The outer side wall of the first sealing portion and the first through hole are clearance-matched at least in the circumferential direction of the motor shaft. A second contact portion is protruded on the outer side wall of the first sealing portion, and the second contact portion and the first through hole are interference-fitted.

12. The electric toothbrush according to claim 11, characterized in that: The second contact portion includes a protruding ring disposed along a circumference of the second through hole.

13. The electric toothbrush according to claim 2, characterized in that: The first sealing portion includes a first sealing section and a second sealing section arranged along the axial direction of the first through hole, the first sealing section is located on the side of the second sealing section facing the outer end of the motor shaft, the first sealing section has an interference fit with the first through hole and the motor shaft, and the second sealing section has a clearance fit with the first through hole.

14. The electric toothbrush according to any one of claims 1 to 13, characterized in that: The outer end surface of the first sealing portion is flush with the outer end surface of the handle housing.

15. The electric toothbrush according to any one of claims 1 to 13, characterized in that: The first through hole includes a first hole segment and a second hole segment arranged in sequence, the second hole segment is located on the side of the first hole segment facing the movement housing, the first sealing portion is clamped between the hole wall of the first hole segment and the motor shaft, and the second sealing portion is clamped between the hole wall of the second hole segment and the movement housing.

16. The electric toothbrush according to claim 15, characterized in that The aperture of the second hole segment is larger than the aperture of the first hole segment, so that a step surface is formed between the first hole segment and the second hole segment; The second sealing portion includes a third sealing segment and a fourth sealing segment which are connected to each other, the third sealing segment being clamped between the step surface and the end surface of the movement housing, and / or the fourth sealing segment being clamped between the side wall of the second hole segment and the side surface of the movement housing.

17. The electric toothbrush according to claim 16, characterized in that: The third sealing section has a third contact portion protruding from one side facing the step surface and / or one side facing the end surface of the movement housing, and the fourth sealing section has a third contact portion protruding from one side facing the side wall of the second hole section and / or one side facing the side surface of the movement housing.

18. The electric toothbrush according to claim 17, characterized in that The third contact portion includes a protruding ring disposed along a circumference of the second sealing portion.

19. The electric toothbrush according to claim 17, characterized in that There are multiple third contact portions, a portion of which are located on the third sealing segment, and another portion of which are located on the fourth sealing segment. The multiple third contact portions located on the third sealing segment are spaced apart along the radial direction of the first through hole, and the multiple third contact portions located on the fourth sealing segment are spaced apart along the axial direction of the first through hole.

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