Oral cleaning appliance

Abstract

The utility model provides an oral cavity cleaning tool, which comprises a handle shell, a handle, a handle, a handle, a handle and a handle, the driving assembly is arranged in the containing cavity, the driving assembly is provided with an output shaft, the output shaft can rotate around the axis of the output shaft in a reciprocating mode and stretch out and draw back in the axis direction of the output shaft, and the output shaft penetrates through the shaft hole; the sealing piece comprises a sleeving part and a sealing part, the sleeving part is arranged on the output shaft in a sleeving mode, the sleeving part comprises a first sleeving part and a second sleeving part, the second sleeving part is connected with the first sleeving part, the sealing part is connected with the first sleeving part, and at least part of the sealing part is located between the hole wall of the shaft hole and the output shaft so as to seal a gap between the output shaft and the hole wall; and the restraining piece is arranged on the second sleeve part, so that the restraining force between the second sleeve part and the output shaft is larger than that between the first sleeve part and the output shaft, and under the restraining action of the restraining piece, the second sleeve part can move along with the output shaft in the stretching and retracting process of the output shaft.

Description

Technical Field

[0001] This application relates to the technical field of oral cleaning, and particularly relates to an oral cleaning appliance. Background Art

[0002] An oral cleaning appliance in the related art includes a handle housing and a movement mechanism assembly disposed within the handle housing. Among them, the movement mechanism assembly includes a drive assembly having an output shaft, and the output shaft passes through a shaft hole provided at one end of the handle housing. Taking an electric toothbrush as an example, a partial structure of the output shaft passes through the shaft hole of the handle housing and is used to connect with a brush head, so as to drive the brush head to move.

[0003] Generally, an oral cleaning appliance is provided with a seal to seal the gap between the output shaft and the hole wall of the shaft hole, so as to prevent external liquid from entering the handle housing and further protect the movement mechanism assembly. However, when the output shaft moves along its own axis, the seal is prone to camming relative to the output shaft, resulting in a poor fit between the seal and the output shaft, thereby affecting the sealing performance of the seal. Summary of the Utility Model

[0004] This application provides an oral cleaning appliance, aiming to improve the problem that the fit between the seal and the output shaft deteriorates when the output shaft moves.

[0005] The specific technical solution is as follows:

[0006] An embodiment of this application provides an oral cleaning appliance, which includes: a handle housing having a receiving cavity and a shaft hole communicating with the receiving cavity; a drive assembly disposed in the receiving cavity, the drive assembly having an output shaft that can reciprocally rotate about its own axis and telescopically move along its own axis, and the output shaft passes through the shaft hole; a seal, the seal includes a sleeved portion and a sealing portion, the sleeved portion is sleeved on the output shaft, the sleeved portion includes a first sleeve portion and a second sleeve portion, the second sleeve portion is connected to the first sleeve portion, the sealing portion is connected to the first sleeve portion, and at least a part of the sealing portion is located between the hole wall of the shaft hole and the output shaft to seal the gap between the output shaft and the hole wall; and a restraint member, the restraint member is disposed on the second sleeve portion so that the binding force between the second sleeve portion and the output shaft is greater than the binding force between the first sleeve portion and the output shaft. Under the restraint of the restraint member, the second sleeve portion can move along with the output shaft during the telescopic movement of the output shaft.

[0007] In the oral cleaning appliance according to the embodiments of the present application, a seal is provided. The seal includes a socket portion and a sealing portion that are connected to each other. The sealing portion is used to seal the gap between the output shaft and the hole wall of the shaft hole, thereby preventing external liquid from entering the handle housing. Among them, the socket portion includes a first socket portion and a second socket portion that are connected to each other. The second socket portion is provided with a constraint member. Under the constraint of the constraint member, when the output shaft moves along its own axis, the second socket portion can better follow the movement of the output shaft. Thus, the second socket portion can always maintain good conformity with the output shaft, and further, the seal has good sealing performance with the output shaft.

[0008] In some embodiments, a limiting protrusion is provided on one of the second socket portion and the output shaft, and a limiting groove that cooperates with the limiting protrusion is provided on the other.

[0009] In some embodiments, the oral cleaning appliance further includes a mounting bracket. The mounting bracket is located in the accommodation cavity and fixed to the handle housing, and the drive assembly is fixed to the mounting bracket; there is a gap between one end of the mounting bracket close to the shaft hole and the socket portion, and the gap is greater than the movement amplitude of the output shaft along its own axis.

[0010] In some embodiments, the oral cleaning appliance further includes a mounting bracket. The mounting bracket is located in the accommodation cavity and fixed to the handle housing, and the drive assembly is fixed to the mounting bracket; the mounting bracket is formed with a through hole, the output shaft passes through the through hole, and the diameter of the through hole is greater than the outer diameter of the socket portion.

[0011] In some embodiments, the first socket portion includes a first fitting portion and a first deformable portion that are connected to each other. The first fitting portion is connected to the sealing portion, the first deformable portion is connected to the second socket portion, and the first fitting portion is in contact with the output shaft; there is a gap between the first deformable portion and the output shaft, or the first deformable portion is formed with a plurality of wrinkles arranged along the axis of the output shaft, or the thickness of the first deformable portion is less than the thickness of the first fitting portion.

[0012] In some embodiments, the inner diameter of the first fitting portion in the natural state is less than or equal to the diameter of the output shaft, so that the first fitting portion is in interference fit with the output shaft when sleeved on the output shaft.

[0013] In some embodiments, a protrusion is provided on the surface of the first fitting portion close to the output shaft, and the first fitting portion abuts against the output shaft through the protrusion, so that the first fitting portion is in close contact with the output shaft.

[0014] In some embodiments, the sealing portion includes a second deformable portion and a second fitting portion that are connected to each other. The second deformable portion is connected to the first sleeve portion, and the second fitting portion abuts against the hole wall of the shaft hole.

[0015] In some embodiments, the depth of the shaft hole is greater than or equal to 3 mm and less than or equal to 10 mm.

[0016] In some embodiments, the oral cleaning appliance further includes a mounting bracket and a limiting plate. The mounting bracket is located in the accommodating cavity and fixed to the handle housing, and the driving assembly is fixed to the mounting bracket. The limiting plate is connected to the mounting bracket, and at least a part of the limiting plate extends into the shaft hole and is located between the second fitting portion and the socket portion. There is a gap between the end of the limiting plate away from the mounting bracket and the second deformable portion, and the gap provides a moving space for the second deformable portion so that the second deformable portion can deform.

[0017] In some embodiments, there is a gap between the limiting plate and the socket portion, and the size of the gap between the limiting plate and the socket portion is greater than or equal to 0.2 mm and less than or equal to 1 mm. There is a gap between the limiting plate and the second fitting portion, and the size of the gap between the limiting plate and the socket portion is greater than or equal to 0.2 mm and less than or equal to 1 mm.

[0018] In some embodiments, there is a gap between the limiting plate and the socket portion, the limiting plate abuts against the second fitting portion, and a part of the second fitting portion is clamped between the limiting plate and the hole wall of the shaft hole.

[0019] In some embodiments, the length of the part of the limiting plate extending into the shaft hole is greater than half of the depth of the shaft hole.

[0020] In some embodiments, the oral cleaning appliance further includes a limiting structure for restricting the output shaft from reciprocally rotating about its own axis between a first position and a second position.

[0021] In some embodiments, during the process of the output shaft rotating from the first position to the second position, the rotated angle is greater than or equal to 3° and less than or equal to 70°.

[0022] In some embodiments, the driving assembly is a motor, the motor includes a stator and a rotor, and the output shaft is connected to the rotor. The limiting structure is installed between the rotor and the stator, or the limiting structure is installed between the rotor and the handle housing.

[0023] In some embodiments, the motor further includes a bearing and an elastic sheet. The bearing and the stator are connected by the elastic sheet, and the output shaft is rotatably fitted in the bearing.

[0024] In some embodiments, the clearance size between the output shaft and the hole wall of the shaft hole is greater than or equal to 2 mm. Description of the Drawings

[0025] Figure 1 Schematic structural diagram of an oral cleaning appliance provided in an embodiment of the present application when a brush head is installed;

[0026] Figure 2 Schematic structural diagram of an oral cleaning appliance provided in an embodiment of the present application when the brush head is not installed;

[0027] Figure 3 Front view of an oral cleaning appliance provided in an embodiment of the present application;

[0028] Figure 4 is Figure 3 Schematic diagram of the A-A cross section in

[0029] Figure 5 is Figure 4 Enlarged schematic diagram of part B in

[0030] Figure 6 Schematic structural diagram of a first seal provided in an embodiment of the present application;

[0031] Figure 7 Cross-sectional schematic diagram of a first seal provided in an embodiment of the present application;

[0032] Figure 8 Schematic structural diagram of a limiting plate and a mounting bracket provided in an embodiment of the present application;

[0033] Figure 9 Cross-sectional schematic diagram of a limiting plate and a mounting bracket provided in an embodiment of the present application;

[0034] Figure 10 Schematic diagram of a drive assembly provided in an embodiment of the present application.

[0035] Description of the Reference Numerals:

[0036] 10. Oral cleaning appliance;

[0037] 100. Handle housing; 101. Accommodating cavity; 102. Shaft hole;

[0038] 210. Mounting bracket; 213. Through hole;

[0039] 220. Driving component; 221. Output shaft; 223. Stator; 224. Rotor; 225. Bearing; 226. Elastic piece;

[0040] 300. Seal;

[0041] 310. Socket part; 311. First socket part; 3111. First fitting part; 3112. First deformation part; 312. Second socket part;

[0042] 320. Sealing part; 321. Second deformation part; 322. Second fitting part;

[0043] 500. Restraint;

[0044] 600. Limit plate;

[0045] 700. Brush head. Detailed implementation manners

[0046] In order to make the objectives, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0047] In the description of the present application, it should be understood that if there are terms such as "upper", "lower", "left", "right", etc. indicating the orientation or positional relationship, they are based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the positional relationship in the drawings are only for illustrative purposes and cannot be understood as a limitation of this patent. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0048] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as implying or indicating relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0049] In the description of the present application, unless otherwise clearly defined and limited, terms such as "installed", "connected", "joined", "fixed", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two components or the interaction relationship between two components, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0050] It should be noted that when an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are only for the purpose of illustration and do not represent the only implementation.

[0051] An oral cleaning appliance in the related art includes a handle housing and a movement assembly disposed inside the handle housing. Among them, the movement assembly includes a drive assembly having an output shaft, and the output shaft passes through a shaft hole provided at one end of the handle housing. Taking an electric toothbrush as an example, a part of the structure of the output shaft passes through the shaft hole of the handle housing and is used to connect to the toothbrush head, so as to drive the toothbrush head to move.

[0052] Generally, an oral cleaning appliance is provided with a seal to seal the gap between the output shaft and the hole wall of the shaft hole, so as to prevent external liquid from entering the handle housing and further protect the movement assembly. However, when the output shaft moves along its own axis direction, the seal is prone to camming relative to the output shaft, making the fit between the seal and the output shaft worse, thereby affecting the sealing performance of the seal.

[0053] Based on the above situation, the present application provides an oral cleaning appliance, aiming to improve the problem that the fit between the seal and the output shaft becomes worse when the output shaft moves.

[0054] Such as Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 and Figure 5As shown in the figure, the oral cleaning appliance 10 provided by the embodiment of the present application includes a handle housing 100, a drive assembly 220, a seal 300, and a restraint member 500. The handle housing 100 has a receiving cavity 101 and a shaft hole 102 communicating with the receiving cavity 101. The drive assembly 220 is disposed in the receiving cavity 101. The drive assembly 220 has an output shaft 221. The output shaft 221 can reciprocally rotate about its own axis and telescopically move along its own axis direction. The output shaft 221 passes through the shaft hole 102. The seal 300 includes a socket portion 310 and a sealing portion 320. The socket portion 310 is sleeved on the output shaft 221. The socket portion 310 includes a first sleeve portion 311 and a second sleeve portion 312. The second sleeve portion 312 is connected to the first sleeve portion 311. The sealing portion 320 is connected to the first sleeve portion 311. The sealing portion 320 is at least partially located between the hole wall of the shaft hole 102 and the output shaft 221 to seal the gap between the output shaft 221 and the hole wall of the shaft hole 102. The restraint member 500 is disposed on the second sleeve portion 312 so that the binding force between the second sleeve portion 312 and the output shaft 221 is greater than the binding force between the first sleeve portion 311 and the output shaft 221. Under the restraint of the restraint member 500, the second sleeve portion 312 can move along with the output shaft 221 during the telescopic movement of the output shaft 221.

[0055] Specifically, the handle housing 100 can be held by a user. That is to say, the user can hold the handle housing 100 during the process of oral cleaning. Therefore, the handle housing 100 can be set as a cylindrical structure with a certain length, so that the handle housing 100 can be more easily grasped by the user.

[0056] The handle housing 100 has a receiving cavity 101 and a shaft hole 102 communicating with the receiving cavity 101. The receiving cavity 101 can be understood as the device cavity of the oral cleaning appliance 10, which is used to accommodate various functional devices of the oral cleaning appliance 10, such as a movement assembly 200, a circuit board, a battery assembly, etc. The shaft hole 102 is used to enable the output shaft 221 of the drive assembly 220 to extend out of the receiving cavity 101.

[0057] In the oral cleaning appliance 10 of the embodiment of the present application, a seal 300 is provided. The seal 300 includes a socket portion 310 and a sealing portion 320 that are connected to each other. The sealing portion 320 is used to seal the gap between the output shaft 221 and the hole wall of the shaft hole 102, thereby preventing external liquid from entering the handle housing 100. Among them, the socket portion 310 includes a first sleeve portion 311 and a second sleeve portion 312 that are connected to each other. The second sleeve portion 312 is provided with a restraint member 500. Under the restraint of the restraint member 500, when the output shaft 221 moves along its own axis direction, the second sleeve portion 312 can better move along with the output shaft 221. Thus, the second sleeve portion 312 can always maintain good fit with the output shaft 221, and further, the seal 300 and the output shaft 221 have good sealing performance.

[0058] In addition, the binding force between the first set of parts 311 and the output shaft 221 is less than the binding force between the second set of parts 312 and the output shaft 221. Thus, during the movement of the output shaft 221 in the axial direction of itself, the first set of parts 311 can be deformed to reduce the dragging of the first set of parts 311 on the second set of parts 312, so that the second set of parts 312 can better maintain the position stability relative to the output shaft 221.

[0059] Specifically, the restraint 500 can be a tightening structure, such as a cable tie, a strap, etc.

[0060] In some embodiments, a limiting protrusion is provided on one of the second set of parts 312 and the output shaft 221, and a limiting groove matching with the limiting protrusion is provided on the other. Through the cooperation of the limiting protrusion and the limiting groove, the followability between the second set of parts 312 and the output shaft 221 can be further improved, so that when the output shaft 221 moves in the axial direction of itself, the second set of parts 312 can better follow the movement of the output shaft 221, thereby further ensuring the sealing performance between the second set of parts 312 and the output shaft 221.

[0061] In some embodiments, as Figure 4 、 Figure 5 shown, the oral cleaning appliance 10 further includes a mounting bracket 210. The mounting bracket 210 is located in the accommodation cavity 101 and fixed to the handle housing 100. The drive assembly 220 is fixed to the mounting bracket 210. One end of the mounting bracket 210 close to the shaft hole 102 forms a distance from the socket part 310, and the distance is greater than the movement amplitude of the output shaft 221 in the axial direction of itself.

[0062] The mounting bracket 210 is mainly used for the installation and fixation of the drive assembly 220 in the accommodation cavity 101. The drive assembly 220 is fixedly connected to the mounting bracket 210, and the mounting bracket 210 is fixedly connected to the handle housing 100, so that a stable connection between the drive assembly 220 and the handle housing 100 can be realized. In addition, the mounting bracket 210 can also be used for the installation and fixation of other functional devices. For example, a battery assembly, a circuit board, etc. can also be fixedly connected to the mounting bracket 210.

[0063] During the movement of the output shaft 221 along its own axis, the socket part 310 will move along with the output shaft 221. If the socket part 310 interferes with the mounting bracket 210 during the movement, it is likely to cause the socket part 310 to axially move relative to the output shaft 221, thereby affecting the sealing performance between the socket part 310 and the output shaft 221. To avoid the above problems, a gap can be maintained between the mounting bracket 210 and the socket part 310, and this gap should be greater than the movement amplitude of the output shaft 221 along its own axis. In this way, the problem that the socket part 310 interferes with the mounting bracket 210 during movement can be avoided.

[0064] In some other embodiments, the oral cleaning appliance 10 further includes a mounting bracket 210. The mounting bracket 210 is located in the accommodation cavity 101 and fixed to the handle housing 100, and the driving assembly 220 is fixed to the mounting bracket 210. The mounting bracket 210 is formed with a through hole 213, and the output shaft 221 passes through the through hole 213. The aperture of the through hole 213 is larger than the outer diameter of the socket part 310.

[0065] With such a setting, even if the socket part 310 moves to the position where the mounting bracket 210 is located, it will enter the through hole 213 and avoid contacting the mounting bracket 210. In this way, the problem that the socket part 310 interferes with the mounting bracket 210 during movement can also be avoided.

[0066] In some embodiments, such as Figure 4 、 Figure 5 、 Figure 6 and Figure 7 shown, the first socket part 311 includes a first fitting part 3111 and a first deformation part 3112 which are connected to each other. The first fitting part 3111 is connected to the sealing part 320, the first deformation part 3112 is connected to the second socket part 312, and the first fitting part 3111 is in contact with the output shaft 221.

[0067] The first fitting part 3111 is mainly used to keep in contact with the output shaft 221, and the first deformation part 3112 is mainly used to generate deformation to reduce the pulling of the second socket part 312 by the first socket part 311 during the movement of the output shaft 221. Therefore, the first deformation part 3112 needs to be constructed into a structure or form that is easy to deform. Exemplarily, a gap can be left between the first deformation part 3112 and the output shaft 221 so that there is no direct constraint between the first deformation part 3112 and the output shaft 221. Or, the first deformation part 3112 is formed with a plurality of folds arranged along the axis of the output shaft 221. Or, the thickness of the first deformation part 3112 is less than the thickness of the first fitting part 3111. The above setting methods can all make the first deformation part 3112 more likely to deform than the first fitting part 3111, thus meeting the setting requirements of the first deformation part 3112.

[0068] In addition, since the first fitting portion 3111 is in contact with the output shaft 221, there is also a certain degree of sealing between the first fitting portion 3111 and the output shaft 221. Since the second sleeve portion 312, the first fitting portion 3111 and the output shaft 221 all have a sealing effect, a double-sealing structure is formed between the socket portion 310 and the output shaft 221. Thus, the sealing performance between the socket portion 310 and the output shaft 221 can be improved.

[0069] In one embodiment, the inner diameter of the first fitting portion 3111 in its natural state is less than or equal to the diameter of the output shaft 221, so that the first fitting portion 3111 has an interference fit with the output shaft 221 when sleeved on the output shaft 221.

[0070] That is to say, in the state where the seal 300 has not been assembled with the output shaft 221, the inner diameter of the first fitting portion 3111 is less than or equal to the diameter of the output shaft 221. Therefore, when the seal 300 is assembled with the output shaft 221, the first fitting portion 3111 and the output shaft 221 must be in an interference fit state. In this way, a better sealing performance can be achieved between the first fitting portion 3111 and the output shaft 221.

[0071] In one embodiment, a protrusion (not shown in the figure) is provided on the surface of the first fitting portion 3111 close to the output shaft 221. The first fitting portion 3111 abuts against the output shaft 221 through the protrusion, so that the first fitting portion 3111 is in close contact with the output shaft 221. The protrusion can be more closely in contact with the output shaft 221, thereby improving the sealing performance between the first fitting portion 3111 and the output shaft 221.

[0072] In some embodiments, as Figure 4 、 Figure 5 、 Figure 6 and Figure 7 shown, the sealing portion 320 includes a second deformation portion 321 and a second fitting portion 322 that are connected to each other. The second deformation portion 321 is connected to the first sleeve portion 311, and the second fitting portion 322 abuts against the hole wall of the shaft hole 102.

[0073] The second fitting portion 322 is mainly used to fit with the hole wall of the shaft hole 102. The second deformation portion 321 is connected between the second fitting portion 322 and the socket portion 310. During the movement of the output shaft 221 in its own axial direction, the second deformation portion 321 can be deformed to adapt to the position change of the socket portion 310. In this way, it is beneficial to keep the second fitting portion 322 in a fitting state with the hole wall of the shaft hole 102 during the movement of the output shaft 221 in its own axial direction.

[0074] Of course, it should be noted that during the movement of the output shaft 221 in its axial direction, due to the pulling effect of the second deformation part 321, the second fitting part 322 may also undergo a certain degree of deformation.

[0075] In one of the embodiments, the hole depth of the shaft hole 102 is greater than or equal to 3 mm and less than or equal to 10 mm. If the hole depth of the shaft hole 102 is too small, the fitting degree between the second fitting part 322 and the hole wall of the shaft hole 102 will be affected under the pulling effect of the second deformation part 321, thereby affecting the sealing performance between the second fitting part 322 and the hole wall. If the hole depth of the shaft hole 102 is too large, with the volume of the accommodation cavity 101 remaining unchanged, it will cause a significant increase in the length of the handle housing 100, thereby increasing the manufacturing cost. After a large number of tests and verifications by the applicant, it is found that when the hole depth of the shaft hole 102 is greater than or equal to 3 mm and less than or equal to 10 mm, it can not only ensure good sealing performance between the second fitting part 322 and the hole wall, but also will not cause a significant increase in the length of the handle housing 100, which is beneficial to controlling the manufacturing cost.

[0076] In some embodiments, as Figure 5 , Figure 8 and Figure 9 shown, the oral cleaning appliance 10 further includes a mounting bracket 210 and a limiting plate 600. The mounting bracket 210 is located in the accommodation cavity 101 and fixed to the handle housing 100, and the driving assembly 220 is fixed to the mounting bracket 210. The limiting plate 600 is connected to the mounting bracket 210. At least part of the limiting plate 600 extends into the shaft hole 102 and is located between the second fitting part 322 and the socket part 310. There is a gap between the end of the limiting plate 600 away from the mounting bracket 210 and the second deformation part 321, and the gap provides a moving space for the second deformation part 321 so that the second deformation part 321 can generate deformation.

[0077] At least part of the limiting plate 600 extends into the shaft hole 102 and there is a gap between the end of the limiting plate 600 and the second deformation part, and this gap can provide a moving space for the second deformation part 321, thus not affecting the deformation of the second deformation part 321. In addition, the limiting plate 600 can play a limiting role on the second deformation part 321 to prevent the second deformation part 321 from indenting into the direction of the accommodation cavity 101.

[0078] In addition, the limiting plate 600 is located between the second fitting part 322 and the socket part 310, and also has a limiting effect on the second fitting part 322 and the socket part 310, which is beneficial to avoiding the second fitting part 322 from approaching the output shaft 221 and affecting the sealing performance between the second fitting part 322 and the hole wall of the shaft hole 102, and is also beneficial to avoiding the socket part 310 from expanding away from the output shaft 221 and affecting the sealing performance between the socket part 310 and the output shaft 221.

[0079] In one of the embodiments, as Figure 5 shown, there is a gap between the limit plate 600 and the socket part 310, and the size of the gap between the limit plate 600 and the socket part 310 is greater than or equal to 0.2 mm and less than or equal to 1 mm; there is a gap between the limit plate 600 and the second fitting part 322, and the size of the gap between the limit plate 600 and the socket part 310 is greater than or equal to 0.2 mm and less than or equal to 1 mm.

[0080] There is a gap between the limit plate 600 and the socket part 310. In this way, friction between the socket part 310 and the limit plate 600 can be avoided. If the above gap is too small, it is still difficult to avoid the situation of mutual friction. If the above gap is too large, it is difficult for the limit plate 600 to effectively play a limiting role on the socket part 310. In this embodiment, the size of the gap between the limit plate 600 and the socket part 310 is greater than or equal to 0.2 mm and less than or equal to 1 mm, which can not only avoid friction between the socket part 310 and the limit plate 600, but also enable the limit plate 600 to effectively play a limiting role on the socket part 310 to ensure the sealing performance between the second fitting part 322 and the pore wall of the shaft hole 102.

[0081] Similarly, there is a gap between the limit plate 600 and the second fitting part 322. In this way, friction between the second fitting part 322 and the limit plate 600 can be avoided. If the above gap is too small, it is still difficult to avoid the situation of mutual friction. If the above gap is too large, it is difficult for the limit plate 600 to effectively play a limiting role on the second fitting part 322. In this embodiment, the size of the gap between the limit plate 600 and the second fitting part 322 is greater than or equal to 0.2 mm and less than or equal to 1 mm, which can not only avoid friction between the second fitting part 322 and the limit plate 600, but also enable the limit plate 600 to effectively play a limiting role on the second fitting part 322 to ensure the sealing performance between the second fitting part 322 and the pore wall of the shaft hole 102.

[0082] In another embodiment, there is a gap between the limit plate 600 and the socket part 310, the limit plate 600 abuts against the second fitting part 322, and a part of the second fitting part 322 is clamped between the limit plate 600 and the pore wall of the shaft hole 102. That is to say, the second fitting part 322 can also be clamped by the limit plate 600. In this case, it can be ensured that the second fitting part 322 is always in contact with the pore wall of the shaft hole 102, and further, good sealing performance is always maintained between the second fitting part 322 and the pore wall.

[0083] In one embodiment, the length of the part of the limiting plate 600 extending into the shaft hole 102 is greater than half of the hole depth of the shaft hole 102. This facilitates the limiting plate 600 to effectively restrict the second fitting portion 322 and the socket portion 310.

[0084] In some embodiments, the oral cleaning appliance 10 further includes a limiting structure for restricting the output shaft 221 from reciprocally rotating about its own axis between a first position and a second position. By providing the limiting structure, it is beneficial to prevent the output shaft 221 from rotating at too large an angle and excessively pulling the seal 300, so as to avoid structural damage to the seal 300 and affecting the sealing performance.

[0085] Further, during the process of the output shaft 221 rotating from the first position to the second position, the rotated angle is greater than or equal to 3° and less than or equal to 70°. That is to say, under the restriction of the limiting structure, the angle rotated by the output shaft 221 during the process of rotating from the first position to the second position is between 3° and 70°. Such a setting is beneficial to prevent the output shaft 221 from rotating at too large an angle and excessively pulling the seal 300, thereby avoiding structural damage to the seal 300 and affecting the sealing performance.

[0086] It can be understood that during the process of the output shaft 221 rotating from the second position to the first position, the rotated angle is also greater than or equal to 3° and less than or equal to 70°.

[0087] Further, as Figure 10 shown, the driving assembly 220 is a motor, the motor includes a stator 223 and a rotor 224, and the output shaft 221 is connected to the rotor 224. There are various choices for the installation position of the limiting structure. For example, the limiting structure is installed between the rotor 224 and the stator 223, or the limiting structure is installed between the rotor 224 and the handle housing 100.

[0088] Exemplarily, the limiting structure can be a positioning protrusion provided on the stator 223. Correspondingly, an abutting portion for cooperating with the positioning protrusion can be provided on the output shaft 221. When the output shaft 221 rotates to the first position and the second position, the abutting portion will abut against the positioning protrusion, so that the output shaft 221 cannot continue to rotate.

[0089] In one embodiment, as Figure 10 shown, the motor further includes a bearing 225 and an elastic sheet 226. The bearing 225 and the stator 223 are connected by the elastic sheet 226, and the output shaft 221 is rotatably fitted in the bearing 225.

[0090] With such a setting, by utilizing the elasticity provided by the elastic sheet 226, the output shaft 221 can move in its own axial direction and be reset during the movement process.

[0091] Furthermore, the clearance dimension between the output shaft 221 and the hole wall of the shaft hole 102 is greater than or equal to 2 mm.

[0092] Since the elastic piece 226 has elasticity, which makes it possible for the output shaft 221 to wobble. When the clearance dimension between the output shaft 221 and the hole wall of the shaft hole 102 is greater than or equal to 2 mm, it can be ensured that the output shaft 221 will not contact the hole wall of the shaft hole 102 during wobbling, thereby reducing the generation of noise.

[0093] The above content is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present application can easily think of changes or substitutions, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. An oral cleaning appliance, characterized in that, Comprising: A handle housing having a receiving cavity and a shaft hole communicating with the receiving cavity; A driving assembly disposed in the receiving cavity, the driving assembly having an output shaft that can reciprocally rotate about its own axis and telescopically move along its own axis, and the output shaft passes through the shaft hole; A seal, the seal includes a sleeved portion and a sealing portion, the sleeved portion is sleeved on the output shaft, the sleeved portion includes a first sleeve portion and a second sleeve portion, the second sleeve portion is connected to the first sleeve portion, the sealing portion is connected to the first sleeve portion, and at least a part of the sealing portion is located between the hole wall of the shaft hole and the output shaft to seal the gap between the output shaft and the hole wall; And A constraint member disposed on the second sleeve portion to make the binding force between the second sleeve portion and the output shaft greater than the binding force between the first sleeve portion and the output shaft. Under the constraint of the constraint member, the second sleeve portion can move along with the output shaft during the telescopic movement of the output shaft.

2. The oral cleaning appliance according to claim 1, characterized in that, A limiting protrusion is provided on one of the second sleeve portion and the output shaft, and a limiting groove cooperating with the limiting protrusion is provided on the other.

3. The oral cleaning appliance according to claim 1, wherein, The oral cleaning appliance further includes a mounting bracket located in the receiving cavity and fixed to the handle housing, and the driving assembly is fixed to the mounting bracket; A spacing is formed between one end of the mounting bracket close to the shaft hole and the sleeved portion, and the spacing is greater than the movement amplitude of the output shaft along its own axis.

4. The oral cleaning appliance according to claim 1, wherein The oral cleaning appliance further includes a mounting bracket located in the receiving cavity and fixed to the handle housing, and the driving assembly is fixed to the mounting bracket; The mounting bracket is formed with a through hole, the output shaft passes through the through hole, and the diameter of the through hole is greater than the outer diameter of the sleeved portion.

5. The oral cleaning appliance according to claim 1, wherein, The first sleeve portion includes a first fitting portion and a first deformable portion connected to each other, the first fitting portion is connected to the sealing portion, the first deformable portion is connected to the second sleeve portion, and the first fitting portion is in contact with the output shaft; A gap is left between the first deformable portion and the output shaft, or the first deformable portion is formed with a plurality of wrinkles arranged along the axis of the output shaft, or the thickness of the first deformable portion is less than the thickness of the first fitting portion.

6. The oral cleaning appliance according to claim 5, characterized in that, The inner diameter of the first fitting portion in the natural state is less than or equal to the diameter of the output shaft, so that the first fitting portion is in interference fit with the output shaft when sleeved on the output shaft.

7. The oral cleaning appliance according to claim 5, characterized in that, A protrusion is provided on the surface of the first fitting portion close to the output shaft, and the first fitting portion abuts against the output shaft through the protrusion to make the first fitting portion in close contact with the output shaft.

8. The oral cleaning appliance according to claim 1, wherein The sealing portion includes a second deformable portion and a second fitting portion connected to each other, the second deformable portion is connected to the first sleeve portion, and the second fitting portion abuts against the hole wall of the shaft hole.

9. The oral cleaning appliance according to claim 8, wherein The depth of the shaft hole is greater than or equal to 3 mm and less than or equal to 10 mm.

10. The oral cleaning appliance according to claim 8, characterized in that, The oral cleaning appliance further includes a mounting bracket and a limiting plate. The mounting bracket is located in the accommodation cavity and fixed to the handle housing, and the drive assembly is fixed to the mounting bracket. The limiting plate is connected to the mounting bracket, and at least a part of the limiting plate extends into the shaft hole and is located between the second fitting portion and the socket portion. A gap is left between one end of the limiting plate away from the mounting bracket and the second deformable portion. The gap provides a moving space for the second deformable portion so that the second deformable portion can deform.

11. The oral cleaning appliance according to claim 10, wherein, A gap exists between the limiting plate and the socket portion, and the size of the gap between the limiting plate and the socket portion is greater than or equal to 0.2 mm and less than or equal to 1 mm; a gap exists between the limiting plate and the second fitting portion, and the size of the gap between the limiting plate and the socket portion is greater than or equal to 0.2 mm and less than or equal to 1 mm.

12. The oral cleaning implement according to claim 10, wherein, A gap exists between the limiting plate and the socket portion, the limiting plate abuts against the second fitting portion, and a part of the second fitting portion is clamped between the limiting plate and the wall of the shaft hole.

13. The oral cleaning appliance according to claim 10, wherein, The length of the part of the limiting plate extending into the shaft hole is greater than half of the depth of the shaft hole.

14. The oral cleaning appliance according to claim 1, characterized in that, The oral cleaning appliance further includes a limiting structure for restricting the output shaft from reciprocally rotating about its own axis between a first position and a second position.

15. The oral cleaning appliance according to claim 14, wherein, During the process of the output shaft rotating from the first position to the second position, the rotated angle is greater than or equal to 3° and less than or equal to 70°.

16. The oral cleaning implement according to claim 14, characterized in that, The drive assembly is a motor, the motor includes a stator and a rotor, and the output shaft is connected to the rotor. The limiting structure is installed between the rotor and the stator, or the limiting structure is installed between the rotor and the handle housing.

17. The oral cleaning appliance according to claim 16, wherein, The motor further includes a bearing and an elastic sheet. The bearing and the stator are connected by the elastic sheet, and the output shaft is rotatably fitted in the bearing.

18. The oral cleaning appliance according to claim 17, wherein, The size of the gap between the output shaft and the wall of the shaft hole is greater than or equal to 2 mm.

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