Shaft seal assembly, front end waterproof assembly, and main body device for handheld instruments

Abstract

To provide a shaft sealing assembly, a front-end waterproof assembly and a host device of a handheld device.SOLUTION: A shaft sealing assembly of a handheld device includes: a center shaft; and a movable sealing assembly, including a fixation seat and a movable sealing member. The fixation seat defines a sleeving hole, an inner circumferential surface of the sleeving hole defines an annular sealing slot, the sealing slot has a front wall surface and a rear wall surface opposite to the front wall surface in an axial direction. The movable sealing member is made of flexible material, the movable sealing member is received in the sleeving hole and extends into the sealing slot, the movable sealing member defines a fixation shaft hole which is sealed to and fixedly sleeves the center shaft, the movable sealing member is sealed to and rotatably mated to the front wall surface and the rear wall surface. No wear occurs between the movable seal member and the central shaft of the present application, and the sealing effect is improved.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] This application relates to the field of waterproof technology for handheld appliances, and particularly to the shaft seal assembly, front-end waterproof assembly and body device of handheld appliances.

Background Art

[0002] Due to the relatively small size of handheld appliances, it is technically difficult to deal with the waterproofing of moving members. An electric toothbrush is a typical handheld appliance. The central axis of its movement constantly wears the waterproof sealing material, and ultimately the seal fails and water leaks. When the seal fails, external dirt such as toothpaste foam fills the gap around the central axis and enters the internal hollow cavity of the handle, causing the product function to fail.

[0003] Conventionally, an electric toothbrush rotates forward and backward at a small angle to fit the brush head to the vibration, or is driven by a magnetic levitation motor to realize the vibration of the brush head. Such an operating method has a small movement width, so the wear of the sealing material is also relatively small.

[0004] Currently, handheld appliances need to drive the operating head to switch with a larger rotation stroke and a higher frequency of forward and reverse rotation. For example, an electric toothbrush needs to move the driving brush head more largely to enhance the toothbrushing effect, or needs to rotate 360 degrees to clean the tongue coating. However, the conventional technology is difficult to meet the above newly developed technical requirements, leading to the technical problems of a short waterproof life of the central axis and a high after-sales service rate of the product.

Prior Art Documents

Patent Documents

[0006] The main objective of this application is to propose a front-end waterproof assembly for a handheld device and a main body device for a handheld device to solve the technical problem of the short waterproof life of the shaft seal assembly of conventional handheld devices and the difficulty in adapting the central shaft to operation with larger rotational strokes and higher forward / reverse switching frequencies. [Means for solving the problem]

[0007] To achieve the above objective, the axial seal assembly of the handheld device according to this application is: The central axis and A movable seal assembly including a fixed seat and a movable seal material, wherein, The aforementioned fixed seat is provided with a through-hole for fitting, and an annular seal groove is provided on the inner circumferential surface of the through-hole for fitting, and the seal groove has a front wall surface and a rear wall surface that are opposite to each other in the axial direction. The movable sealing material is made of a flexible material, and is provided in the fitting through hole and protruding into the sealing groove. The movable sealing material is provided with a fixed shaft hole that is sealed to and fixedly fitted to the central axis, and the movable sealing material is sealed to and rotatably fitted to the front wall surface and the rear wall surface, respectively.

[0008] Preferably, a pitch is formed between the outer circumferential surface of the movable sealing material and the inner circumferential surface of the seal groove, and the movable sealing material and the fixed seat surround each other to form a seal chamber located in the cavity within the seal groove.

[0009] Preferably, the movable seal assembly further includes an oily sealing material filled in the seal chamber, the oily sealing material forming an oil seal interface between the movable seal material and the front wall surface, and between the movable seal material and the rear wall surface.

[0010] Preferably, the front end surface of the movable sealing material is provided with a front annular projection around the fixed shaft hole, the front annular projection being sealed and rotatably fitted to the front wall surface, and the rear end surface of the movable sealing material is provided with a rear annular projection around the fixed shaft hole, the rear annular projection being sealed and rotatably fitted to the rear wall surface.

[0011] Preferably, the front wall surface and / or rear wall surface are high-gloss surfaces, and their coefficient of friction is smaller than that of the outer surface of the fixed seat.

[0012] Preferably, the movable sealing material is pre-fitted axially to the front wall surface and the rear wall surface, respectively.

[0013] Preferably, the movable seal assembly further includes an annular locking clip, the annular locking clip is fitted onto the outer circumferential surface of the movable seal material, and the annular locking clip and the movable seal material are interlocked radially.

[0014] Preferably, an annular stopper groove is provided on the outer circumferential surface of the movable sealing material, and the annular locking clip is provided within the stopper groove.

[0015] Preferably, the ring-shaped locking clip is a coil spring, and both the front and rear ends of the ring-shaped locking clip elastically contact the axially opposing side walls of the stopper groove.

[0016] Preferably, the fixed seat includes a base and a front cover fixedly connected to the base, the base and the front cover enclose the fitting through hole and seal groove, the fitting through hole includes a rear opening provided in the base and a front opening provided in the front cover, the front wall surface of the seal groove is formed in the front cover and the rear wall surface of the seal groove is formed in the base.

[0017] Preferably, the axial overlap between the movable sealing material and the fixed seat is [0.1%, 0.5%].

[0018] Preferably, the base includes a seal cylinder, an inner peripheral surface of the seal groove is formed on the seal cylinder, an annular concave groove is provided on an inner wall surface of a front end of the seal cylinder, the front cover includes a cover plate and an inner stopper, the cover plate covers an open front side of the seal cylinder, the inner stopper is annular and protrudes from a rear side surface of the cover plate, and the inner stopper is fitted in the annular concave groove in a conforming manner.

[0019] Preferably, the movable sealing material is made of rubber or silica gel, the base and the front cover are both made of plastic material, and a rear end surface of the inner stopper is fixed by ultrasonic welding to an inner wall surface of the annular concave groove.

[0020] Preferably, an outer stopper plane is provided on an outer peripheral surface of the inner stopper, and an inner stopper plane that conforms to and is bonded to the outer stopper plane is provided on an inner peripheral surface of the annular concave groove.

[0021] Preferably, the base further includes a positioning protrusion provided on a front end surface of the seal cylinder, and a positioning concave groove that conforms to the positioning protrusion is provided on an outer edge of the front cover.

[0022] Preferably, the positioning protrusion extends along an axial direction and protrudes from an outer peripheral surface of the seal cylinder, and an insertion groove that conforms to the positioning protrusion is provided on an inner wall surface of the stationary sealing material.

[0023] This application further proposes a front-end waterproof assembly of a handheld device, and the front-end waterproof assembly of the handheld device includes a case in which an accommodation cavity is formed inside and a seal through-hole communicating with the accommodation cavity is provided on a front end surface, and a stationary sealing material provided in the seal through-hole and seal-fitted to the seal through-hole, and a movable shaft hole communicating with the accommodation cavity is provided, and the shaft seal assembly of the handheld device described above, where The central axis is drilled in the movable shaft hole and extends outward from the case. The central axis is sealed in the movable shaft hole and is fitted rotatably. The movable seal assembly is provided in the accommodation cavity and is located behind the stationary sealing material. The fixed seat is fixedly installed with respect to the case.

[0024] Preferably, the stationary sealing material has an annular sealing surface installed backward. The annular sealing surface is formed around the movable shaft hole. The front surface of the fixed seat is sealed by being bonded to the annular sealing surface.

[0025] Preferably, the fixed seat and the stationary sealing material are interference-fitted in the axial direction.

[0026] Preferably, positioning protrusions extending along the axial direction are provided on the outer peripheral surface of the fixed seat, and insertion grooves adapted to the positioning protrusions are provided on the inner wall surface of the stationary sealing material.

[0027] This application further proposes a main body device of a handheld instrument including a handle and a motor. The main body device of the handheld instrument further includes the shaft seal assembly of the handheld instrument described above. The central axis is part of the rotor of the motor. The fixed seat is fixedly installed with respect to the handle, or The main body device of the handheld instrument further includes the front-end waterproof assembly of the handheld instrument described above. The handle is the case. The motor is provided in the accommodation cavity of the case. The central axis is part of the rotor of the motor.

Advantages of the Invention

[0028] The shaft seal assembly for a handheld device of the present invention forms two seals on the front and rear walls of the seal groove by a movable seal material and a fixed seat, respectively. Since the movable seal material rotates along the central axis, wear does not occur between the movable seal material and the central axis. Furthermore, by shifting the movable seal interface to the movable seal material, the sealing area is increased, improving the sealing effect, further extending the waterproof life of the shaft seal assembly for the handheld device, and reducing the after-sales maintenance rate of the product. [Brief explanation of the drawing]

[0029] To more clearly illustrate the technical concepts in the embodiments of this application, the following is a brief introduction to the drawings that may be used in the description of the embodiments. It is obvious that the drawings in the following description are only a few embodiments of this application, and those skilled in the art can obtain other drawings based on these without expending any creative effort. [Figure 1] This is a schematic front view of the local structure of one embodiment of the front end waterproof assembly of a handheld device according to the present invention. [Figure 2] This is a schematic diagram of the cross-sectional structure along line II-II in Figure 1. [Figure 3] Figure 1 shows an exploded view of the local structure and a schematic diagram of the composite cross-sectional structure along line II-II. [Figure 4] Figure 3 is a schematic diagram of the enlarged structure of the movable sealing material. [Figure 5] Figure 1 is a schematic diagram of the decomposed local structure. [Figure 6] Figure 5 is a schematic diagram of the enlarged structure of the movable seal assembly. [Figure 7] This is a schematic diagram of the exploded structure of the local structure in Figure 1, viewed from a different angle. [Figure 8] Figure 7 is a schematic diagram of the enlarged structure of the movable seal assembly shown in Figure 7. [Figure 9] This is a schematic perspective view of one embodiment of the main body of the handheld device of the present invention. [Modes for carrying out the invention]

[0030] The following describes the technical concepts in the embodiments of this application clearly and completely, linking them to the drawings of the embodiments. It is clear that the described embodiments are only a subset of the embodiments of this application, not all of them. All other embodiments derived from the embodiments of this application, without requiring any creative effort by a person skilled in the art, fall within the scope of protection of this application.

[0031] Referring to Figures 1 to 8, in one embodiment, the shaft seal assembly of the handheld device is applied to the front end waterproof assembly 200 of the handheld device, and this shaft seal assembly of the handheld device is The central axis 30 and It includes a movable seal assembly 40 which includes a fixed seat 50 and a movable seal material 60, wherein, The fixed seat 50 is provided with a through-hole 51, and an annular seal groove 52 is provided on the inner circumferential surface of the through-hole 51, and the seal groove 52 has a front wall surface 521 and a rear wall surface 522 that are opposite to each other in the axial direction. The movable seal material 60 is made of a flexible material and is provided in the fitting through hole 51 and protrudes into the seal groove 52. The movable seal material 60 is provided with a fixed shaft hole 61 that is sealed to and fixedly fitted to the central shaft 30, and the movable seal material 60 is sealed to and rotatably fitted to the front wall surface 521 and the rear wall surface 522, respectively.

[0032] In this embodiment, the movable sealing material 60 is generally made of a flexible material, such as rubber or silica gel.

[0033] The central shaft 30 is used for connection and transmission. For example, in an embodiment applied to an electric toothbrush, the front end of the central shaft 30 is used to attach the brush head, and the rear end forms part of the motor rotor. As can be understood, the central shaft 30 and the motor rotor can be installed separately, and a transmission mechanism can be added between them, for example.

[0034] Since the fixed seat 50 needs to perform both support and stopper functions, it is generally manufactured from a hard material such as hard rubber, and the specific manufacturing process can be an injection molding process.

[0035] The seal groove 52 and the movable seal material 60 are fitted together, forming a sealed space that ensures a sealing effect. The movable seal material 60 also needs to be rotatably fitted to the front wall surface 521 and the rear wall surface 522 of the seal groove 52.

[0036] The front end waterproof assembly 200 of the handheld device of the present invention forms two seals on the front wall surface 521 and rear wall surface 522 of the seal groove 52 by a movable seal material 60 and a fixed seat 50, respectively. Since the movable seal material 60 rotates according to the central axis 30, no wear occurs between the movable seal material 60 and the central axis 30. Furthermore, by shifting the movable seal interface to the movable seal material 60, the sealing area is increased, improving the sealing effect, further extending the waterproof life of the axial seal assembly of the handheld device, and reducing the after-sales maintenance rate of the product.

[0037] Furthermore, a pitch is formed between the outer surface of the movable seal material 60 and the inner surface of the seal groove 52, thereby reducing the frictional force between the movable seal material 60 and the fixed seat 50. The movable seal material 60 and the fixed seat 50 surround and form a seal chamber 70 located in the inner cavity of the seal groove 52, and in this way, existing substances within the seal chamber 70, such as air and oil, can also act as a barrier against invading contaminants.

[0038] Furthermore, the movable seal assembly 40 further includes an oily sealing material that is filled into the seal chamber 70, and the oily sealing material forms an oily sealing interface between the movable seal material 60 and the front wall surface 521, and between the movable seal material 60 and the rear wall surface 522. In this embodiment, by filling the seal chamber 70 with an oily sealing material, frictional force can be further reduced, wear can be further reduced, and an additional oily sealing interface can be formed to enhance the sealing effect.

[0039] Furthermore, the front end surface of the movable sealing material 60 is provided with a front annular projection 62 around the fixed shaft hole 61, and the front annular projection 62 is sealed and rotatably fitted to the front wall surface 521. The rear end surface of the movable sealing material 60 is provided with a rear annular projection 63 around the fixed shaft hole 61, and the rear annular projection 63 is sealed and rotatably fitted to the rear wall surface 522.

[0040] In this embodiment, after forming the oil seal interface, the contact area between the movable seal material 60 and the inner wall surface of the seal groove 52 is changed to annular protrusions, for example, a front annular protrusion 62 and a rear annular protrusion 63. In this way, frictional force is reduced by locally reducing the contact area without reducing the sealing effect, and further wear is reduced.

[0041] Furthermore, in order to reduce friction, both the front wall surface 521 and the rear wall surface 522 of the seal groove 52 are high-gloss surfaces, and their coefficient of friction is smaller than that of the outer surface of the fixed seat 50. For example, the front wall surface 521 and the rear wall surface 522 of the seal groove 52 are smoother than the outer surface of the fixed seat 50, and specifically, the coefficients of friction of the front wall surface 521 and the rear wall surface 522 are both [0.05, 0.1].

[0042] Furthermore, the movable sealing material 60 is pre-fitted axially to the front wall surface 521 and the rear wall surface 522, respectively. In this embodiment, the elastic deformation of the movable sealing material 60 can be used to compensate for axial gaps due to filling vibrations, and it is also ensured that the positive pressure required for sealing is greater than a preset threshold. Preferably, the axial overlap between the movable sealing material 60 and the fixed seat 50 is [0.1%, 0.5%], thereby achieving a preset sealing effect and reducing the rotational resistance of the central shaft 30.

[0043] Furthermore, the movable seal assembly 40 further includes an annular locking clip 80, the annular locking clip 80 is fitted onto the outer circumferential surface of the movable seal material 60, and the annular locking clip 80 and the movable seal material 60 are interlocked radially.

[0044] In this embodiment, the installation of the ring-shaped locking clip 80 enhances the fixing and sealing effect between the movable sealing material 60 and the central shaft 30. Furthermore, the radial biasing of the ring-shaped locking clip 80 deforms the movable sealing material 60 in the axial direction, thereby better ensuring axial pre-pressure fitting between the movable sealing material 60 and the front wall surface 521 and the rear wall surface 522, respectively.

[0045] Furthermore, an annular stopper groove 64 is provided on the outer surface of the movable sealing material 60, and the annular locking clip 80 is placed inside the stopper groove 64. In this way, the annular locking clip 80 is less likely to fall off the movable sealing material 60, thereby facilitating integrated assembly and improving assembly efficiency.

[0046] Furthermore, the ring-shaped locking clip 80 is a coil spring, and both the front and rear ends of the ring-shaped locking clip 80 elastically contact the axially opposing side walls of the stopper groove 64.

[0047] In this embodiment, the coil spring is a standard part, readily available and inexpensive. The ring-shaped locking clip 80 is less likely to loosen when it contacts the axially opposing side walls of the stopper groove 64, while the side walls of the stopper groove 64 are bent outward, which is advantageous for axial pre-pressure fitting between the movable sealing material 60 and the front wall surface 521 and the rear wall surface 522, respectively.

[0048] Furthermore, the fixed seat 50 includes a base 53 and a front cover 57 fixedly connected to the base 53, the base 53 and the front cover 57 enclose a fitting through hole 51 and a seal groove 52, the fitting through hole 51 includes a rear opening 54 provided in the base 53 and a front opening 581 provided in the front cover 57, the front wall surface 521 of the seal groove 52 is formed in the front cover 57 and the rear wall surface 522 of the seal groove 52 is formed in the base 53.

[0049] In this embodiment, the overall size of the fixed seat 50 is relatively small, and the shape of the seal groove 52 is not suitable for direct die-cutting, i.e., it cannot be molded in one direction. Therefore, the fixed seat 50 is formed by connecting a separate base 53 and a front cover 57. In this way, the process cost of forming the internal cavity of the fixed seat 50 can be reduced. For example, the base 53 and the front cover 57 may each be die-cast from metal and connected by screws or welding, or the base 53 and the front cover 57 may both be made of plastic and both may be fixed by ultrasonic welding or a dispenser.

[0050] Furthermore, the base 53 includes a seal cylinder 55, the inner circumferential surface of the seal groove 52 is formed in the seal cylinder 55, and an annular groove 551 is provided on the inner wall surface of the front end of the seal cylinder 55. The front cover 57 includes a cover plate 58 and an inner stopper opening 59, the cover plate 58 is placed over the front opening of the seal cylinder 55, the inner stopper opening 59 is annular in shape and protrudes from the rear side surface of the cover plate 58, and the inner stopper opening 59 is fitted into the annular groove 551. In this way, the base 53 and the front cover 57 are less likely to shift laterally. Preferably, the movable seal material 60 is made of rubber or silica gel, and both the base 53 and the front cover 57 are made of plastic. The rear end surface of the inner stopper 59 is ultrasonically welded to the inner wall surface of the annular groove 551. In this way, even if the movable seal material 60, base 55 and front cover 57 come into contact, the material of the seal material 60 is different from that of the base 55 and front cover 57, so even if they come into contact, the seal material 60 will not adhere to the base 55 and front cover 57 during the ultrasonic welding process.

[0051] Furthermore, an outer stopper plane 591 is provided on the outer circumferential surface of the inner stopper opening 59, and an inner stopper plane 552 is provided on the inner circumferential surface of the annular groove 551 that conforms to and is bonded to the outer stopper plane. In this way, the front cover 57 is prevented from rotating relative to the base 53, and specifically in the ultrasonic welding process, a stopper structure that prevents rotation between the front cover 57 and the base 53 is advantageous in improving the efficiency of bonding.

[0052] Furthermore, the base 53 further includes a positioning projection 56 provided on the front end surface of the seal cylinder 55, and the outer edge of the front cover 57 is provided with a positioning groove 582 that fits the positioning projection 56.

[0053] In this embodiment, the fitting of the positioning projection 56 and the positioning groove 582 can form a multi-layered circumferential stopper, thereby making the stopper fitting between the base 53 and the front cover 57 stronger. Furthermore, since the positioning projection 56 and the positioning groove 582 are located in easily observable areas, the fitting of the positioning projection 56 and the positioning groove 582 can guide the fitting of the outer stopper surface 591 and the inner stopper surface 552.

[0054] Furthermore, the positioning projection 56 extends axially and protrudes from the outer circumferential surface of the seal cylinder 55, and an insertion groove 22 that fits the positioning projection 56 is provided on the inner wall surface of the stationary seal material 20. This circumferential stopper for the base 53 not only simplifies the associated assembly structure but also improves the structural strength of the positioning projection 56 itself, and the front end of the positioning projection 56 can be located further outward in the radial direction, thus increasing the bonding area between the cover plate 58 and the front end surface of the seal cylinder 55.

[0055] Furthermore, the stationary sealing material 20 has a rearward-facing annular sealing surface, which is formed around the movable shaft hole 21, and the front surface of the fixed seat 50 is sealed by bonding with the annular sealing surface, thereby improving sealing performance, for example, in the lateral path. Preferably, the fixed seat 50 and the stationary sealing material 20 are interference-fitted in the axial direction, thereby filling any gaps that may occur during vibration due to elastic deformation.

[0056] Please refer again to Figures 1 to 8. This application further proposes a front end waterproof assembly 200 for a handheld device, which is a front end waterproof assembly 200 for a handheld device. A case 10 having an internal housing cavity 11 and a seal through hole 12 communicating with the housing cavity 11 provided on its front end surface, A stationary sealing material 20 is provided in the sealing through hole 12 and is sealed and fitted into the sealing through hole 12, and has a movable shaft hole 21 that communicates with the housing cavity 11, The above-described handheld device includes an axial seal assembly, wherein The central shaft 30 is drilled in the movable shaft hole 21 and extends outward from the case 10, and the central shaft 30 is sealed and rotatably fitted into the movable shaft hole 21. The movable seal assembly 40 is provided in the housing cavity and is located behind the stationary seal material 20, and the fixed seat 50 is fixedly installed relative to the case 10.

[0057] In this embodiment, the case 10 is used to provide support and protection to its internal components, and the case 10 can be used solely for mounting the seal assembly and the transmission assembly, and can also provide a gripping function.

[0058] The stationary sealing material 20 and the movable sealing material 60 are generally made of flexible material, such as rubber or silica gel. To enhance the sealing effect, multiple annular protrusions for forming wrinkles may be provided on the inner wall surface of the movable shaft hole 21.

[0059] The specific structure of the shaft seal assembly of the handheld instrument is described with reference to the above embodiments, and since this electric toothbrush employs all the technical proposals of all the above embodiments, it similarly has all the beneficial effects of the technical proposals of the above embodiments, which will not be described in general terms here.

[0060] The central shaft 30 is used for connection and transmission. For example, in an embodiment applied to an electric toothbrush, the front end of the central shaft 30 is used to attach the brush head, and the rear end forms part of the motor rotor. As can be understood, the central shaft 30 and the motor rotor can be installed separately, and a transmission mechanism can be added between them, for example.

[0061] The fixed seat 50 may be directly fixedly connected to the case 10, or it may be fixed to the case 10 by means of a nip or other method between the case 10 and other components. Since the fixed seat 50 needs to perform the functions of support and stopper, it is generally manufactured from a rigid material, such as hard rubber, and the specific manufacturing process can be an injection molding process.

[0062] The fitting of the seal groove 52 and the movable seal material 60 can form a sealed space and guarantee a sealing effect. Since the movable seal material 60 needs to be rotatably fitted to the front wall surface 521 and the rear wall surface 522 of the seal groove 52, both the front wall surface 521 and the rear wall surface 522 of the seal groove 52 are smooth surfaces, also known as high-gloss surfaces, in order to reduce frictional force.

[0063] The front end waterproof assembly 200 of the handheld device of the present invention can form an outer seal by installing a stationary seal material 20 and an inner seal by adding a movable seal assembly 40. Specifically, the movable seal material 60 and the fixed seat 50 form two seals on the front wall surface 521 and rear wall surface 522 of the seal groove 52, respectively. Since the movable seal material 60 rotates according to the central axis 30, no wear occurs between the movable seal material 60 and the central axis 30. Furthermore, by shifting the movable seal interface to the movable seal material 60, the sealing area is increased, improving the sealing effect, further extending the waterproof life of the front end of the handheld device, and reducing the after-sales maintenance rate of the product.

[0064] Please also refer to Figure 9. This application further proposes a main body device 100 of a handheld device (not shown) including a handle and a motor. The main body of the handheld device further includes the shaft seal assembly of the handheld device described above, wherein the central shaft is part of the rotor of the motor, and the fixed seat is fixedly mounted to the handle, or The main body of the handheld device further includes the front end waterproof assembly of the handheld device described above, the handle being a case, the motor being housed in a cavity of the case, and the central shaft being part of the rotor of the motor.

[0065] In this embodiment, the main body of the handheld device may be the main body of an electric toothbrush shown in Figure 9, or it may be a handheld device with the same function, such as an electric hair iron. The handle can provide support and protection to its internal components and provide a gripping action to the user. The motor is used to provide a power source for the movement of the central shaft 30. The specific structure of the shaft seal assembly of the handheld device and the front end waterproof assembly 200 of the handheld device will be described with reference to the above embodiment, and since this electric toothbrush adopts all the technical ideas of all the above embodiments, it similarly has all the beneficial effects of the technical ideas of the above embodiments and will not be described in general terms here.

[0066] Finally, it should be noted that the above embodiments are merely for illustrative purposes and not limiting purposes. Although the present application has been described in detail with reference to the above embodiments, it is still possible to modify the inventions described in the above embodiments or to replace some of the technical features with equivalent ones, as will be understood by those skilled in the art. Such modifications or replacements will not cause the essence of the invention to deviate from the spirit and scope of the inventions described in the embodiments of this application.

Claims

1. A shaft seal assembly for a handheld device, The central axis (30) and, It includes a fixed seat (50) and a movable seal assembly (40) including a movable seal material (60), wherein, The side of the central axis (30) to which the brush head is attached is considered the front, and the side away from the brush head is considered the rear. The fixed seat (50) is provided with a sheathing through hole (51), and an annular seal groove (52) is provided on the inner circumferential surface of the sheathing through hole (51), and the seal groove (52) has a front wall surface (521) and a rear wall surface (522) that are opposite to each other in the axial direction. The movable sealing material (60) is made of a flexible material, and the movable sealing material (60) is provided in the fitting through hole (51) and protrudes into the sealing groove (52), and the movable sealing material (60) is provided with a fixed shaft hole (61) that is sealed and fixedly fitted to the central shaft (30), and the movable sealing material (60) is sealed and rotatably fitted to the front wall surface (521) and the rear wall surface (522), respectively. The movable sealing material (60) is pre-fitted axially to the front wall surface (521) and the rear wall surface (522), The movable seal assembly (40) further includes an annular locking clip (80), the annular locking clip (80) is fitted onto the outer circumferential surface of the movable seal material (60), and the annular locking clip (80) and the movable seal material (60) are interlocked radially. An annular stopper groove (64) is provided on the outer circumferential surface of the movable sealing material (60), and the annular locking clip (80) is provided within the stopper groove (64). The axial seal assembly for a handheld device is characterized in that the ring-shaped locking clip (80) is a coil spring, and the front and rear ends of the ring-shaped locking clip (80) elastically contact the front and rear wall surfaces of the stopper groove (64), which are opposite to each other in the axial direction.

2. The axial seal assembly for a handheld device according to claim 1, characterized in that a pitch is formed between the outer circumferential surface of the movable seal material (60) and the inner circumferential surface of the seal groove (52), and the movable seal material (60) and the fixed seat (50) surround and form a seal chamber (70) located in the cavity within the seal groove (52).

3. The axial seal assembly for a handheld device according to claim 2, wherein the movable seal assembly (40) further comprises an oily sealing material filled in the seal chamber (70), the oily sealing material forming an oily sealing interface between the movable seal material (60) and the front wall surface (521), and between the movable seal material (60) and the rear wall surface (522).

4. The shaft seal assembly for a handheld device according to claim 3, characterized in that the front end surface of the movable seal material (60) is provided with a front ring-shaped projection (62) around the fixed shaft hole (61), the front ring-shaped projection (62) is sealed and rotatably fitted to the front wall surface (521), and the rear end surface of the movable seal material (60) is provided with a rear ring-shaped projection (63) around the fixed shaft hole (61), the rear ring-shaped projection (63) is sealed and rotatably fitted to the rear wall surface (522).

5. The shaft seal assembly for a handheld device according to claim 3, characterized in that the front wall surface (521) and / or the rear wall surface (522) are high-gloss surfaces and their coefficient of friction is smaller than that of the outer surface of the fixed seat (50).

6. The shaft seal assembly for a handheld device according to claim 2, characterized in that the front wall surface (521) and / or the rear wall surface (522) are high-gloss surfaces and their coefficient of friction is smaller than that of the outer surface of the fixed seat (50).

7. The shaft seal assembly for a handheld device according to claim 1, characterized in that the front wall surface (521) and / or the rear wall surface (522) are high-gloss surfaces and their coefficient of friction is smaller than that of the outer surface of the fixed seat (50).

8. The axial seal assembly for a handheld device according to claim 1, characterized in that the axial overlap between the movable seal material (60) and the fixed seat (50) is [0.1%, 0.5%].

9. The axial seal assembly for a handheld device according to claim 1, characterized in that the fixed seat (50) includes a base (53) and a front cover (57) fixedly connected to the base (53), the base (53) and the front cover (57) surround and form the fitting through hole (51) and the seal groove (52), the fitting through hole (51) includes a rear opening (54) provided in the base (53) and a front opening (581) provided in the front cover (57), the front wall surface (521) of the seal groove (52) is formed in the front cover (57), and the rear wall surface (522) of the seal groove (52) is formed in the base (53).

10. The axial seal assembly for a handheld device according to claim 9, characterized in that the base (53) includes a seal cylinder (55), the inner circumferential surface of the seal groove (52) is formed in the seal cylinder (55), an annular groove (551) is provided on the inner wall surface of the front end of the seal cylinder (55), the front cover (57) includes a cover plate (58) and an inner stopper (59), the cover plate (58) is placed over the front opening of the seal cylinder (55), the inner stopper (59) is annular in shape and protrudes from the rear side surface of the cover plate (58), and is fitted into the inner stopper (59) and the annular groove (551).

11. The axial seal assembly for a handheld device according to claim 10, characterized in that the movable seal material (60) is made of rubber or silica gel, the base (53) and the front cover (57) are both made of plastic, and the rear end surface of the inner stopper (59) is fixed to the inner wall surface of the annular groove (551) by ultrasonic welding.

12. The shaft seal assembly for a handheld device according to claim 11, characterized in that an outer stopper plane (591) is provided on the outer circumferential surface of the inner stopper opening (59), and an inner stopper plane (552) is provided on the inner circumferential surface of the annular groove (551) that conforms to and is bonded to the outer stopper plane.

13. The shaft seal assembly for a handheld device according to claim 10, characterized in that an outer stopper plane (591) is provided on the outer circumferential surface of the inner stopper opening (59), and an inner stopper plane (552) is provided on the inner circumferential surface of the annular groove (551) that conforms to and is bonded to the outer stopper plane.

14. The axial seal assembly for a handheld device according to claim 10, characterized in that the base (53) further includes a positioning projection (56) provided on the front end surface of the seal cylinder (55), and the outer edge of the front cover (57) is provided with a positioning groove (582) that fits the positioning projection (56).

15. The positioning projection (56) extends along the axial direction and protrudes from the outer circumferential surface of the seal cylinder (55), and an insertion groove (22) that fits the positioning projection (56) is provided on the inner wall surface of the stationary seal material (20). The axial seal assembly for a handheld device according to feature 14.

16. A front end waterproof assembly (200) of a handheld device, A case (10) having an internal housing cavity (11) and a seal through hole (12) communicating with the housing cavity (11) provided on its front end surface, A stationary sealing material (20) is provided in the seal through hole (12) and is sealed and fitted into the seal through hole (12), and has a movable shaft hole (21) that communicates with the housing cavity (11), The handheld device shaft seal assembly according to any one of claims 1 to 15, wherein, The central shaft (30) is drilled in the movable shaft hole (21) and extends outward from the case (10), and the central shaft (30) is sealed and rotatably fitted into the movable shaft hole (21). A front-end waterproof assembly for a handheld device, characterized in that the movable seal assembly (40) is provided in the housing cavity (11) and is located behind the stationary seal material (20), and the fixed seat (50) is fixedly installed relative to the case (10).

17. The front end waterproof assembly of a handheld device according to claim 16, characterized in that the stationary sealing material (20) has a rearward-facing annular sealing surface, the annular sealing surface is formed around the movable shaft hole (21), and the front surface of the fixed seat (50) is sealed by being bonded to the annular sealing surface.

18. The front end waterproof assembly of a handheld device according to claim 17, characterized in that the fixed seat (50) and the static sealing material (20) are interlocked in the axial direction.

19. The front end waterproof assembly of a handheld device according to claim 16, characterized in that a positioning projection (56) extending along the axial direction is provided on the outer circumferential surface of the fixed seat (50), and an insertion groove (22) that fits the positioning projection (56) is provided on the inner wall surface of the stationary sealing material (20).

20. The front end waterproof assembly of a handheld device according to claim 17, characterized in that a positioning projection (56) extending in the axial direction is provided on the outer circumferential surface of the fixed seat (50), and an insertion groove (22) that fits the positioning projection (56) is provided on the inner wall surface of the stationary sealing material (20).

21. The front end waterproof assembly of a handheld device according to claim 18, characterized in that a positioning projection (56) extending along the axial direction is provided on the outer circumferential surface of the fixed seat (50), and an insertion groove (22) that fits the positioning projection (56) is provided on the inner wall surface of the stationary sealing material (20).

22. A main body device of a handheld device including a handle and a motor, A handheld device body comprising an axial seal assembly for a handheld device according to any one of claims 1 to 15, wherein the central shaft (30) is part of the rotor of the motor, and the fixed seat (50) is fixedly installed with respect to the handle.

23. A main body device of a handheld device including a handle and a motor, A handheld device body comprising a front end waterproof assembly (200) of a handheld device according to claim 16, wherein the handle is a case (10), the motor is provided in a housing cavity (11) of the case (10), and the central axis (30) is part of the rotor of the motor.

24. A main body device of a handheld device including a handle and a motor, A handheld device body comprising a front end waterproof assembly (200) of a handheld device according to claim 17, wherein the handle is a case (10), the motor is provided in a housing cavity (11) of the case (10), and the central axis (30) is part of the rotor of the motor.

25. A main body device of a handheld device including a handle and a motor, The main body of a handheld device further comprises a front end waterproof assembly (200) of a handheld device according to claim 18, wherein the handle is a case (10), the motor is provided in a housing cavity (11) of the case (10), and the central axis (30) is part of the rotor of the motor.

26. A main body device of a handheld device including a handle and a motor, A handheld device body comprising a front end waterproof assembly (200) of a handheld device according to claim 19, wherein the handle is a case (10), the motor is provided in a housing cavity (11) of the case (10), and the central axis (30) is part of the rotor of the motor.

27. A main body device of a handheld device including a handle and a motor, A handheld device body comprising a front end waterproof assembly (200) of a handheld device according to claim 20, wherein the handle is a case (10), the motor is provided in a housing cavity (11) of the case (10), and the central axis (30) is part of the rotor of the motor.

28. A main body device of a handheld device including a handle and a motor, A handheld device body comprising a front end waterproof assembly (200) of a handheld device according to claim 21, wherein the handle is a case (10), the motor is provided in a housing cavity (11) of the case (10), and the central axis (30) is part of the rotor of the motor.

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