Electric toothbrush head and electric toothbrush

Abstract

The utility model discloses an electric toothbrush head and an electric toothbrush. The electric toothbrush head comprises a brush body, a rod body, a connecting piece and a first sealing piece. And bristles are arranged on the brush body. One end of the rod body is connected with the brush body, and the rod body is provided with a containing cavity penetrating through the other end. The connecting piece is installed in the containing cavity. The connecting piece comprises a top and a bottom which are opposite, a mounting cavity penetrating through the bottom and a through hole communicated with the mounting cavity are formed in the connecting piece, and the top is closer to the brush body than the bottom in the length direction of the connecting piece. The first sealing piece is arranged in the through hole and blocks communication between the installation cavity and the containing cavity, and therefore liquid entering the installation cavity from the bottom of the connecting piece is prevented from entering the containing cavity through the through hole.

Description

Technical Field

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

[0002] As people's living standards improve, they pay more and more attention to oral health. Compared with traditional manual toothbrushes, electric toothbrushes have significant advantages in cleaning efficiency, ease of use and comfort, so they are becoming more and more popular among the public, and the functions and appearance designs of electric toothbrushes are constantly enriched.

[0003] Usually, an electric toothbrush includes a body and an electric toothbrush head. The body includes a brush handle and a motor installed in the brush handle. The electric toothbrush head includes a rod body and a connecting piece installed in the rod body. The output shaft of the motor is connected to the connecting piece. The motor drives the rod body to vibrate to drive the brush body connected to the rod body to vibrate, and then drives the bristles to vibrate to the part to be cleaned in the oral cavity. Since the electric toothbrush head is an external part of the electric toothbrush and will not affect the corrosion of the body, there is basically no liquid-proof design for the electric toothbrush head at present. However, once liquid enters the interior of the electric toothbrush head, on the one hand, it will increase the weight of the electric toothbrush head, reduce the amplitude of the vibration of the electric toothbrush head, and affect the cleaning effect of the electric toothbrush; on the other hand, the liquid will corrode the interior of the electric toothbrush head and affect the service life of the electric toothbrush head; on the other hand, the liquid will also cause bacteria to grow inside the electric toothbrush head, which will seriously affect oral health. Utility Model Content

[0004] The embodiments of the present application provide an electric toothbrush head and an electric toothbrush, which are at least used to solve the problem that the electric toothbrush head of the electric toothbrush is not waterproof.

[0005] The electric toothbrush head provided in the embodiment of the present application includes a brush body, a rod body, a connecting piece and a first sealing piece. The brush body is provided with bristles. One end of the rod body is connected to the brush body, and the rod body is provided with a receiving cavity penetrating the other end. The connecting piece is installed in the receiving cavity. The connecting piece includes a top and a bottom relative to each other, and is provided with a mounting cavity penetrating the bottom and a through hole communicating with the mounting cavity, and in the length direction of the connecting piece, the top is closer to the brush body than the bottom. The first sealing piece is arranged in the through hole, and blocks the communication between the mounting cavity and the receiving cavity. The connecting piece in the electric toothbrush head is provided with a through hole due to its own positioning and forming. The first sealing piece is installed in the through hole, which can block the connection between the installation cavity and the accommodating cavity, and prevent the liquid that enters the installation cavity from the bottom of the connecting piece from entering the accommodating cavity through the through hole. On the one hand, it can avoid the increase of the weight of the electric toothbrush head and ensure that the amplitude of the vibration of the electric toothbrush head is not affected, thereby ensuring the cleaning effect of the electric toothbrush; on the other hand, it can keep the inside of the electric toothbrush head dry and fresh, avoid liquid corrosion inside the electric toothbrush head, and extend the service life of the electric toothbrush head; on another hand, the dryness and freshness of the inside of the electric toothbrush head can avoid the breeding of bacteria and ensure the health of the oral cavity to be cleaned.

[0006] In some embodiments, the through hole is disposed at the top, which can facilitate the positioning of the connecting member and the rod body during molding.

[0007] In some embodiments, the connector further comprises a side portion connecting the top portion and the bottom portion. The through hole is arranged on the side portion, which can facilitate the positioning of the connector with the rod body during molding.

[0008] In some embodiments, through holes can be provided on the top and the side, which can provide dual positioning for the connector and increase the positioning accuracy of the connector and the rod. At the same time, the two through holes can provide redundant matching for the connector. When one through hole loses its positioning function due to wear or other reasons, the other through hole can still maintain its positioning function, thereby improving the molding yield of the connector.

[0009] In certain embodiments, when the through hole is disposed on the side, the number of the through holes includes two, and the two through holes penetrate in one direction, which can not only provide redundant cooperation for the connecting piece, but also simplify the production process by molding the two through holes in the same direction.

[0010] In one embodiment, the first seal is molded in the through hole of the connector by a secondary injection molding process, so that the molding of the first seal and the connection between the first seal and the connector can be completed together, thereby improving the sealing performance of the first seal.

[0011] In certain embodiments, the first sealing member is interference-fitted into the through hole of the connecting member, which can make the molding of the first sealing member simpler and more convenient.

[0012] In some embodiments, the connector is an integral structure, and the area on the connector except the through hole is a closed structure that blocks the connection between the installation cavity and the accommodating cavity. The integrally formed connector has no gaps between the components that may exist when multiple components are spliced ​​together, which can make the connector have a better sealing effect.

[0013] In some embodiments, the portion of the rod from the top of the connecting piece to the brush body is an integrated solid structure so that liquid can no longer flow toward the brush body, further improving the waterproof effect of the electric toothbrush head.

[0014] In some embodiments, the electric toothbrush head further includes a second seal, which is connected to both the rod body and the connector. The second seal is located between the inner side of the side wall of the rod body and the outer side of the side of the connector, and is used to seal the gap between the inner side of the side wall of the rod body and the outer side of the side of the connector, which can prevent external fluid from entering the accommodating cavity through the gap between the inner side of the side wall of the rod body and the outer side of the side of the connector. On the one hand, the increase in the weight of the electric toothbrush head can be avoided, ensuring that the amplitude of the vibration of the electric toothbrush head is not affected, thereby ensuring the cleaning effect of the electric toothbrush. On the other hand, the interior of the electric toothbrush head can be kept dry and fresh, liquid corrosion to the interior of the electric toothbrush head can be avoided, and the service life of the electric toothbrush head can be extended. On the other hand, the dryness and freshness of the interior of the electric toothbrush head can avoid the growth of bacteria and ensure the health of the oral cavity to be cleaned.

[0015] In some embodiments, the second seal is located between the inner side of the side wall of the rod body and the outer side of the side portion, and blocks the gap between the inner side of the side wall of the rod body and the outer side of the side portion, which helps to maintain the structural stability between the connecting piece and the rod body while blocking the gap, and reduce looseness or displacement during the use of the electric toothbrush.

[0016] In some embodiments, the second sealing member is a rubber sealing ring, which can not only seal the gap between the inner side of the side wall of the rod body and the outer side of the side portion of the connecting member, but also has simple molding.

[0017] In some embodiments, the second sealing member is a sealant, which can be directly filled and cured in the gap between the inner side of the side wall of the rod body and the outer side of the side portion, thereby simplifying the sealing process.

[0018] In some embodiments, the electric toothbrush head also includes a covering, which covers at least the inner side of the side wall of the rod body. The covering located on the inner side of the side wall of the rod body forms a second seal. The molding of the second seal in the form of the covering is completed together with the connection between the second seal and the connecting member, which not only saves time and cost, but also improves the sealing performance of the second seal.

[0019] In some embodiments, the covering member at least covers the outer side of the side portion of the coupling member, and the covering member located on the outer side of the side portion forms a second sealing member. The second sealing member can provide a more secure sealing effect for the coupling member to prevent dirt from being deposited on the outer side of the side portion of the coupling member.

[0020] In some embodiments, the second seal is located on the bottom wall of the rod body and blocks the gap between the side wall and the side portion of the rod body. The second seal can provide a more secure sealing effect for the connecting member and the rod body to prevent dirt from accumulating in the gap between the side wall and the side portion of the rod body. The second seal disposed on the bottom wall of the rod body can also enhance the connection stability between the connecting member and the rod body and reduce looseness when the electric toothbrush head vibrates.

[0021] In some embodiments, the second sealing member is a rubber sealing ring, which can not only seal the gap between the side wall and the side portion of the rod body, but also has simple molding.

[0022] In some embodiments, the second sealing member is a sealant, which can be directly filled and cured in the gap between the side wall and the side portion of the rod body, and the sealant simplifies the sealing process.

[0023] In some embodiments, the covering at least covers the bottom wall of the rod body and the bottom of the connecting member, and the covering forms a second seal, forming a continuous sealing area for the bottom wall of the rod body and the bottom of the connecting member, thereby enhancing the overall sealing effect of the electric toothbrush head and providing a cushioning effect when the electric toothbrush head falls, reducing damage.

[0024] In certain embodiments, when the covering member forms the second sealing member, the first sealing member and the second sealing member are an integral structure, and the integral molding can provide a more continuous sealing method for the electric toothbrush head and reduce potential gaps.

[0025] In some embodiments, when the covering member forms the second sealing member, the covering member also covers the outer side of the side wall of the rod body, which can provide a shock absorbing effect for the side wall of the rod body and prevent the side wall of the rod body from breaking when the electric toothbrush head falls.

[0026] In certain embodiments, when the covering forms a second seal, the covering also covers all areas of the outer side of the side wall of the rod body, all areas of the bottom wall of the rod body, and all areas of the brush body except the bristles. The covering in multiple positions is integrally formed, which can make it easier to form a second seal.

[0027] In some embodiments, the covering member covers the outer side of the side wall of the rod body, the bottom wall of the rod body and the brush body, and both the rod body and the covering member are light-permeable, which can provide a shock-absorbing effect for the rod body to prevent the rod body from breaking when the electric toothbrush head falls. The covering member can produce elastic deformation on the brush body to prevent the brush body from colliding with the oral cavity and damaging the oral cavity. Both the rod body and the covering member are light-permeable, allowing the user to clearly see the internal structure of the electric toothbrush head.

[0028] In some embodiments, a first fixing portion is provided on the inner side of the side portion of the connecting member. The first fixing portion is used to be fixedly connected to the output shaft of the motor. The first fixing portion is a convex block protruding from the inner side of the side portion in the axial direction of the mounting cavity, and the convex block is detachably connected to the output shaft. The convex block includes a supporting surface, and the output shaft includes a surface to be supported, and the supporting surface is in contact with the surface to be supported, and the supporting surface and the surface to be supported are both planes. There are at least two convex blocks, and at least two convex blocks are evenly distributed around the axis of the mounting cavity. The first fixing portion is fixedly connected to the output shaft of the motor, transmits vibration to the rod body, and can also prevent the electric toothbrush head from rotating relative to the output shaft of the motor, ensuring that the electric toothbrush head can only rotate synchronously with the output shaft of the motor. The detachable design also makes it easy to remove the output shaft of the motor from the first fixing portion.

[0029] In some embodiments, a deformable second fixing portion is further provided on the inner side of the side portion. The second fixing portion is closer to the bottom than the first fixing portion. The second fixing portion is used to be elastically connected to the output shaft. The first end of the second fixing portion is connected to the inner side of the side portion. The second end of the second fixing portion is a free end. The second end of the second fixing portion can be deformed with the first end of the second fixing portion as a fulcrum, and when the output shaft of the motor is inserted into the mounting cavity of the connecting piece, the second fixing portion can avoid an installation path for the output shaft of the motor. After the output shaft of the motor is inserted into the mounting cavity of the connecting piece, the second fixing portion can also prevent the electric toothbrush head from rotating relative to the output shaft of the motor, ensuring that the electric toothbrush head can only rotate synchronously with the output shaft of the motor.

[0030] In some embodiments, the length of the connector is less than or equal to half the length of the rod, which can prevent the connector from being too long and compressing the air in the hollow portion of the rod, thereby preventing poor sealing of the rod or expansion and damage to the rod.

[0031] The electric toothbrush in the embodiments of the present application includes the electric toothbrush head and the brush handle in any one of the embodiments. The electric toothbrush head is connected to the brush handle through the mounting cavity. The connecting piece in the electric toothbrush head is provided with a through hole due to its own positioning molding. The first sealing piece is installed in the through hole, which can block the connection between the mounting cavity and the accommodating cavity, and can prevent the liquid entering the mounting cavity from the bottom of the connecting piece and then entering the accommodating cavity through the through hole. On the one hand, it can avoid the increase of the weight of the electric toothbrush head, ensure that the amplitude of the vibration of the electric toothbrush head is not affected, thereby ensuring the cleaning effect of the electric toothbrush; on the other hand, it can keep the inside of the electric toothbrush head dry and fresh, avoid liquid corrosion inside the electric toothbrush head, and extend the service life of the electric toothbrush head; on the other hand, the dryness and freshness inside the electric toothbrush head can avoid the breeding of bacteria and ensure the health of the oral cavity to be cleaned.

[0032] Additional aspects and advantages of the embodiments of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the embodiments of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0034] Figure 1 A schematic diagram of the three-dimensional structure of an electric toothbrush head according to some embodiments of the present application;

[0035] Figure 2 yes Figure 1 The three-dimensional exploded schematic diagram of the electric toothbrush head shown;

[0036] Figure 3 yes Figure 1 A schematic cross-sectional view of an electric toothbrush head shown;

[0037] Figure 4 yes Figure 3 The enlarged schematic diagram shown at VII in the middle;

[0038] Figure 5 yes Figure 1 A cross-sectional schematic diagram of a connecting member and a first sealing member of an electric toothbrush head shown;

[0039] Figure 6 yes Figure 1 A cross-sectional schematic diagram of a connecting member and a first sealing member of an electric toothbrush head shown;

[0040] Figure 7 yes Figure 1 A schematic diagram of the three-dimensional structure of the connecting member and the first sealing member of the electric toothbrush head shown;

[0041] Figure 8It is a schematic diagram of the three-dimensional structure of an electric toothbrush according to certain embodiments of the present application.

[0042] Description of main component symbols:

[0043] Electric toothbrush 1000;

[0044] An electric toothbrush head 100 and a brush handle 300;

[0045] Brush body 10;

[0046] Bristles 20;

[0047] Rod body 30, accommodating cavity 31, side wall 33, inner side 331, outer side 333, bottom wall 35;

[0048] Connecting member 50, top 51, bottom 52, side 53, outer side 531, inner side 533, mounting cavity 54, through hole 55, first fixing portion 57, protrusion 571, abutting surface 5711, second fixing portion 59, first end 591, second end 592;

[0049] A first sealing member 60;

[0050] A second sealing member 70;

[0051] The covering member 90. DETAILED DESCRIPTION

[0052] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions from beginning to end. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the embodiments of the present application, and cannot be understood as limiting the embodiments of the present application.

[0053] In the description of the present application, it should be understood that the terms "thickness", "upper", "top", "bottom", "inside", "outside", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. The terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0054] In the description of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. In an example, it can be a fixed connection, or a detachable connection, or an integral connection; it can be a mechanical connection, or an electrical connection, or they can communicate with each other; it can be a direct connection, or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements.

[0055] See also Figure 1 and Figure 2 The electric toothbrush head 100 of the embodiment of the present application includes a brush body 10, a rod body 30, a connector 50 and a first seal 60. The brush body 10 is provided with bristles 20. One end of the rod body 30 is connected to the brush body 10, and the rod body 30 is provided with a receiving cavity 31 that passes through the other end. The connector 50 is installed in the receiving cavity 31. The connector 50 includes a top 51 and a bottom 52 opposite to each other, and is provided with a mounting cavity 54 that passes through the bottom 52 and a through hole 55 that communicates with the mounting cavity 54. In the length direction of the connector 50, the top 51 is closer to the brush body 10 than the bottom 52. The first seal 60 is arranged in the through hole 55, and blocks the communication between the mounting cavity 54 and the receiving cavity 31.

[0056] Specifically, the brush body 10 is a component on the electric toothbrush head 100 for mounting the bristles 20. The bristles 20 can be arranged on the brush body 10 by a copper-based bristle implantation process or a copper-free bristle implantation process. In some embodiments, the brush body 10 can be integrally formed or segmented. The brush body 10 can be made of a hard material, such as plastics such as PP, ABS or PBT, or a flexible material, or a part of the brush body can be made of a hard material and the other part of the brush body can be made of a flexible material.

[0057] The bristles 20 are components of the electric toothbrush head 100 for cleaning and / or caring for the teeth, gums or the inner wall of the oral cavity waiting for care. The surface of the brush body 10 on which the bristles 20 are installed is a hair-planting surface. One end of the bristles 20 extends into the brush body 10 from the hair-planting surface and is installed on the brush body 10, and the other end of the bristles 20 is a free end that is not located on the side where the hair-planting surface is located. The bristles 20 include a plurality of brush filaments. The material of the brush filaments includes but is not limited to nylon, polyamide or silicone. In the case where the material of the brush filaments is a hard material such as nylon or polyamide, the free end of the bristles 20 can contact the tooth surface and clean the teeth and the gaps between the teeth. In the case where the material of the brush filaments is a flexible material such as silicone, the free end of the bristles 20 can contact the tooth surface to perform a polishing-like care on the tooth surface, and the free end of the bristles 20 can also be used to clean the gums or the inner wall of the oral cavity, which are easily damaged, so that the cleaning effect of the electric toothbrush head 100 is better without causing damage to the user. In some embodiments, the brush body 10 and the bristles 20 are integrally formed. In other embodiments, the brush body 10 and the bristles 20 are separately formed.

[0058] The rod body 30 is a component on the electric toothbrush head 100 that is connected to the motor output shaft (not shown) and transmits the vibration of the motor to the brush body 10. One end of the rod body 30 is detachably connected to the output shaft of the motor, and the other end is connected to the brush body 10. At the end connected to the output shaft of the motor, the rod body 30 is provided with a receiving cavity 31 that runs through the end connected to the output shaft of the motor. The receiving cavity 31 is used to accommodate the output shaft of the motor. The rod body 30 is roughly a columnar structure, and the columnar structure can facilitate the rod body 30 to extend into the oral cavity so that the bristles 20 on the brush body 10 can touch the part to be cared for, thereby ensuring the cleaning effect of the electric toothbrush head 100. When the motor is running, the rod body 30 can transmit the vibration of the motor to the brush body 10, and the brush body 10 then transmits the vibration to the bristles 20, and the bristles 20 can clean the part to be cared for in the oral cavity during the vibration process. The shape of the cross section of the rod body 30 includes but is not limited to a perfect circle, an ellipse or a polygon. In some embodiments, the rod body 30 may be made of a hard material, such as plastics such as PP, ABS or PBT.

[0059] In some embodiments, the brush body 10 and the rod body 30 are an integrated structure, that is, the brush body 10 and the rod body 30 are an integral structure. The integrated structure can improve the bonding strength between the brush body 10 and the rod body 30, prevent the brush body 10 and the rod body 30 from being separated during the operation of the electric toothbrush head 100, thereby ensuring the stability and reliability of the operation of the electric toothbrush head 100. In other embodiments, the rod body 30 and the brush body 10 are formed separately, and the rod body 30 and the brush body 10 can be connected by non-detachable means such as gluing, hot melting or interference connection, or by detachable means such as snap connection, threaded connection or bolt connection, which is not limited here. The material of the brush body 10 can be the same as that of the rod body 30, for example, the material of the brush body 10 and the material of the rod body 30 are both PP plastic; or, the material of the brush body 10 and the material of the rod body 30 can also be different, for example, the material of the brush body 10 is PP plastic, and the material of the rod body 30 is ABS plastic, which is not limited here.

[0060] The length direction X of the electric toothbrush head 100 may be the direction from the brush body 10 to the rod body 30 , or the direction from the rod body 30 to the brush body 10 .

[0061] See also Figure 1 and Figure 2 , the connecting member 50 is a component installed in the accommodating cavity 31, and is used to connect the output shaft of the motor and the rod body 30. In some embodiments, the connecting member 50 and the rod body 30 can be combined together by a non-detachable connection method, and the non-detachable connection method includes but is not limited to bonding, welding or interference connection. The connecting member 50 can be made of metal material or non-metallic material. The metal material includes but is not limited to aluminum alloy or steel; the non-metallic material includes but is not limited to plastic. In the case where the connecting member 50 is made of metal material, the structural strength of the connecting member 50 is relatively high, thereby reducing the possibility of collision damage to the connecting member 50 and ensuring the normal connection between the electric toothbrush head 100 and the brush handle 300. In the case where the connecting member 50 is made of non-metallic material, the weight of the connecting member 50 is relatively light, which is conducive to the realization of the electric toothbrush head 100 and the electric toothbrush 1000 ( Figure 8 Lightweight.

[0062] In the length direction of the connecting member 50 (i.e., the length direction X of the electric toothbrush head 100), the connecting member 50 includes a top 51 and a bottom 52. The top 51 is closer to the brush body 10 than the bottom 52. The top 51 of the connecting member 50 can collide with the end of the rod body 30, or keep a certain distance from the end of the rod body 30. The bottom 52 of the connecting member 50 is provided with a mounting cavity 54 that runs through the bottom 52, for mounting the output shaft of the motor. The vibration of the output shaft of the motor can be transmitted to the rod body 30 through the connecting member 50, and the rod body 30 transmits the vibration to the brush body 10, thereby driving the bristles 20 to vibrate to clean the part to be cleaned in the oral cavity.

[0063] The connecting member 50 is also provided with a through hole 55 communicating with the mounting cavity 54, which is used for positioning and forming the connecting member 50. The number of the through hole 55 is at least one.

[0064] The first sealing member 60 is disposed in the through hole 55, and the first sealing member 60 is used to block the communication between the installation cavity 54 and the accommodating cavity 31. The first sealing member 60 can be integrally formed with the connecting member 50, or can be separately formed with the connecting member 50. In some embodiments, the connecting member 50 and the first sealing member 60 can be combined together in a non-detachable connection manner, and the non-detachable connection manner includes but is not limited to bonding, welding or interference connection.

[0065] In the electric toothbrush head 100 of the present application, the connecting member 50 is provided with a through hole 55 due to its own positioning molding, and the first sealing member 60 is installed in the through hole 55, which can block the connection between the installation cavity 54 and the accommodating cavity 31, and prevent the liquid from entering the installation cavity 54 from the bottom 52 of the connecting member 50 and then entering the accommodating cavity 31 through the through hole 55. On the one hand, it can avoid the increase in the weight of the electric toothbrush head 100 and ensure that the amplitude of the vibration of the electric toothbrush head 100 is not affected, thereby ensuring the cleaning effect of the electric toothbrush; on the other hand, it can keep the inside of the electric toothbrush head 100 dry and fresh, avoid liquid corrosion inside the electric toothbrush head 100, and extend the service life of the electric toothbrush head 100; on another hand, the dryness and freshness of the inside of the electric toothbrush head 100 can avoid the breeding of bacteria and ensure the health of the oral cavity to be cleaned.

[0066] See also Figure 2 In some embodiments, the through hole 55 is disposed at the top 51 .

[0067] Specifically, when the through hole 55 is provided at the top 51 , it is convenient to position the connecting member 50 during molding.

[0068] Please continue reading Figure 2 In some other embodiments, the connecting member 50 further includes a side portion 53 connecting the top portion 51 and the bottom portion 52 . A through hole 55 is disposed in the side portion 53 .

[0069] Specifically, the side portion 53 of the connector 50 is a portion connecting the top portion 51 and the bottom portion 52. In the present application, the connector 50 contacts and fits with the inner wall of the rod body 30. When the through hole 55 is provided on the side portion 53 (not shown), it is also convenient to position the connector 50 during molding.

[0070] Please continue reading Figure 2 In some other embodiments, the through holes 55 may be provided on the top 51 and the side 53 .

[0071] Specifically, the number of through holes 55 may be two. In other embodiments, the number of through holes 55 may be multiple. When the through holes 55 are provided at the top 51 and the side 53, dual positioning can be provided for the molding of the connector 50, thereby increasing the accuracy of positioning during molding of the connector 50. At the same time, the two through holes 55 can provide a redundant design for the connector 50. When one through hole 55 loses its positioning function due to wear or the like, the other through hole 55 can still maintain its positioning function, thereby increasing the molding yield of the connector 50.

[0072] Please continue reading Figure 2 In some other embodiments, when the through hole 55 is disposed on the side portion 53, the number of the through holes 55 includes two, and the two through holes 55 penetrate in one direction.

[0073] Specifically, the two through holes 55 may penetrate in any direction except the length direction X. The two through holes 55 penetrating in one direction can not only provide dual positioning and redundant design, but also the molding in the same direction can simplify the production process.

[0074] See also Figure 2 In some embodiments, the first seal 60 is molded in the through hole 55 of the connector 50 by a secondary injection molding process.

[0075] Specifically, the secondary injection molding process (overmolding process) forms the first seal 60 by injecting the material used for the first seal 60 again on the first injection molded connector 50. The secondary injection molding process can realize the molding of the first seal 60 and the connection of the first seal 60 and the connector 50 in one production cycle, which can not only save time and cost, but also improve the sealing performance of the first seal 60.

[0076] Please continue reading Figure 2 In some embodiments, the first sealing member 60 is interference-fitted into the through hole 55 of the coupling member 50 .

[0077] Specifically, when the first seal 60 and the connector 50 are separately molded, the first seal 60 is installed in the through hole 55 of the connector 50 in an interference fit. The first seal 60 is molded separately, which makes the molding of the first seal 60 simpler and more convenient. The first seal 60 can be made of a flexible material with a certain elasticity such as silicone, polyurethane, or rubber, so that the first seal 60 can produce a certain elastic deformation when inserted into the through hole 55, thereby facilitating installation into the through hole 55. The first seal 60 can also be made of a hard material, such as plastics such as PP, ABS, or PBT. The first seal 60 can also be made of a variety of materials, for example, the first seal 60 is made of a hard material and a layer of elastic material is wrapped on the outer surface of the hard material. The material of the connecting component 50 and the material of the first sealing component 60 may be the same, for example, both the material of the connecting component 50 and the material of the first sealing component 60 are PP plastic; or, the material of the connecting component 50 and the material of the first sealing component 60 may be different, for example, the material of the connecting component 50 is PP plastic and the material of the first sealing component 60 is silicone.

[0078] See also Figure 2 and Figure 3 In some embodiments, the connecting member 50 is an integral structure, and the area on the connecting member 50 except the through hole 55 is a closed structure that blocks the connection between the installation cavity 54 and the accommodating cavity 31.

[0079] Specifically, the integrated structure refers to a structure in which the connector 50 is formed in one piece, without the need for multiple parts to be spliced ​​together. The closed structure means that, except for the through hole 55, the other areas of the connector 50 are seamless and non-hollow.

[0080] The integrally formed connector 50, on the one hand, does not have the gaps between components that may exist when multiple components are spliced ​​together, thereby preventing liquid from entering the accommodating cavity 31 and improving the waterproof effect of the electric toothbrush head 100. On the other hand, the integrally formed connector 50 simplifies the number of components in the connector 50, thereby simplifying the structure of the connector 50. On the other hand, the integrally formed connector 50 does not have obvious visual breakpoints, and has a good visual effect.

[0081] See also Figure 2 and Figure 3 In some embodiments, the portion of the rod body 30 from the top 51 of the connecting member 50 to the brush body 10 is an integral solid structure.

[0082] Specifically, the portion of the rod body 30 from the top 51 of the connecting piece 50 to the brush body 10 refers to the area starting from the top 51 of the connecting piece 50 and extending along the length direction X of the rod body 30 toward the brush body 10 until it is connected to the brush body 10. The portion of the rod body 30 from the top 51 of the connecting piece 50 to the brush body 10 is an integrated solid structure, which means that the portion of the rod body 30 from the top 51 of the connecting piece 50 to the brush body 10 is filled with a solid structure, and liquid can no longer flow in the direction of the brush body 10, further improving the waterproof effect of the electric toothbrush head 100.

[0083] See also Figure 2 , Figure 3 and Figure 4 Further, in some embodiments, the electric toothbrush head 100 may further include a second sealing member 70 connected to both the rod body 30 and the connecting member 50. The second sealing member 70 is located between the inner side 331 of the side wall 33 of the rod body 30 and the outer side 531 of the side portion 53 of the connecting member 50, and is used to seal the gap between the inner side 331 of the side wall 33 of the rod body 30 and the outer side 531 of the side portion 53 of the connecting member 50.

[0084] Specifically, during the use of the electric toothbrush head 100, external fluid may enter the accommodating chamber 31 through the gap between the inner side 331 of the side wall 33 of the rod body 30 and the outer side 531 of the side portion 53 of the connecting member 50, thereby contaminating the electric toothbrush head 100. In addition, the external fluid entering the accommodating chamber 31 will also increase the weight of the electric toothbrush head 100, thereby reducing the amplitude of the electric toothbrush head 100 and affecting the cleaning effect. The second seal 70 is located between the inner side 331 of the side wall 33 of the rod body 30 and the outer side 531 of the side portion 53 of the connecting member 50, and can prevent the external fluid from entering the accommodating chamber 31 through the gap between the inner side 331 of the side wall 33 of the rod body 30 and the outer side 531 of the side portion 53 of the connecting member 50. On the one hand, it can avoid the increase of the weight of the electric toothbrush head 100, ensure that the amplitude of the vibration of the electric toothbrush head 100 is not affected, thereby ensuring the cleaning effect of the electric toothbrush; on the other hand, it can keep the inside of the electric toothbrush head 100 dry and fresh, avoid liquid corrosion inside the electric toothbrush head 100, and extend the service life of the electric toothbrush head 100; on the other hand, the dryness and freshness inside the electric toothbrush head 100 can avoid the breeding of bacteria and ensure the health of the oral cavity to be cleaned. In addition, in the process of the vibration of the motor being transmitted to the rod body 30 through the connecting member 50, the second seal 70 can buffer the vibration, thereby making the vibration of the rod body 30 softer, thereby achieving a protective effect on the oral cavity. In addition, the second sealing member 70 can also achieve an interference connection with the connecting member 50, thereby improving the connection strength of the connecting member 50 on the rod body 30, preventing the connecting member 50 from falling off from the rod body 30 during the operation of the electric toothbrush, thereby improving the electric toothbrush 1000 ( Figure 8The stability and reliability of the work.

[0085] See also Figure 2 , Figure 3 and Figure 4 In some embodiments, the second seal 70 is located between the inner side 331 of the side wall 33 of the rod body 30 and the outer side 531 of the side portion 53 , and blocks the gap between the inner side 331 of the side wall 33 of the rod body 30 and the outer side 531 of the side portion 53 .

[0086] Specifically, the second sealing member may be connected to the inner side 331 of the side wall 33 of the rod body 30, may be connected to the outer side 531 of the side portion 53, may be connected to both the inner side 331 of the side wall 33 of the rod body 30 and the outer side 531 of the side portion 53, or may not be connected to either (just in close contact with) the inner side 331 of the side wall 33 of the rod body 30 or the outer side 531 of the side portion 53. The second sealing member 70 may be placed in the gap in a non-detachable connection manner, and the non-detachable connection manner includes but is not limited to bonding, etc.

[0087] The second seal 70 is located between the inner side 331 of the side wall 33 of the rod body 30 and the outer side 531 of the side portion 53, which can directly seal the gap there and help maintain the structural stability between the connecting member 50 and the rod body 30, reducing looseness or displacement during the use of the electric toothbrush 1000.

[0088] See also Figure 3 and Figure 4 In some embodiments, the second sealing member 70 is a rubber sealing ring.

[0089] Specifically, the second seal 70 can be a separately formed seal ring, which can fill and close the gap between the inner side 331 of the side wall 33 of the rod body 30 and the outer side 531 of the side portion 53 of the connector 50. The second seal 70 can be placed in the gap in a non-detachable connection manner, and the non-detachable connection manner includes but is not limited to bonding. The second seal 70 can also be placed in the gap in a detachable connection manner, and the detachable connection manner includes but is not limited to interference fit. When interference fit is adopted, the outer diameter of the second seal 70 is slightly larger than the maximum outer contour dimension of the gap. During installation, the second seal 70 is compressed and pushed into the gap between the inner side 331 of the side wall 33 of the rod body 30 and the outer side 531 of the side portion 53 of the connector 50 along the length direction X of the rod body 30, and the gap is closed by the elasticity of the rubber. The seal ring can not only seal the gap between the inner side 331 of the side wall 33 of the rod body 30 and the outer side 531 of the side portion 53 of the connector 50, but also has simple molding.

[0090] See also Figure 3 and Figure 4 In some embodiments, the second sealing member 70 is a sealant.

[0091] Specifically, the second sealing member 70 can be directly filled and cured at the gap between the inner side 331 of the side wall 33 of the rod body 30 and the outer side 531 of the side portion 53, and the filling and curing methods include but are not limited to direct injection and coating. The sealant simplifies the sealing process and has a more comprehensive sealing for the irregular gap between the inner side 331 of the side wall 33 of the rod body 30 and the outer side 531 of the side portion 53.

[0092] See also Figure 2 , Figure 3 and Figure 4 In some embodiments, the electric toothbrush head 100 may further include a covering member 90 , which covers at least the inner side 331 of the side wall 33 of the rod body 30 , and the covering member 90 located on the inner side 331 of the side wall 33 of the rod body 30 forms a second sealing member 70 .

[0093] Specifically, the second seal 70 can be formed by injecting the material used for the second seal 70 again on the first injection-molded connector 50 through a process such as secondary injection molding, so as to form the second seal 70 in the form of coating the surface of the connector 50. The coating 90 can be a soft rubber or other elastic materials. The molding of the second seal 70 formed by the coating 90 and the connection of the second seal 70 with the connector 50 are completed within one production cycle, which can not only save time and cost, but also improve the sealing performance of the second seal 70.

[0094] See also Figure 2 , Figure 3 and Figure 4 In some embodiments, the covering member 90 covers at least the outer side 531 of the side portion 53 of the connecting member 50 , and the covering member 90 located on the outer side 531 of the side portion 53 forms the second sealing member 70 .

[0095] Specifically, the second sealing member 70 can be connected to the outer side 531 of the side portion 53 of the connecting member 50 in a non-detachable manner, and the non-detachable connection manner includes but is not limited to bonding, etc. The second sealing member 70 covers the outer side 531 of the side portion 53 of the connecting member 50, which can provide a more secure sealing effect for the connecting member 50 and prevent dirt (such as sewage or tartar, etc.) from being deposited on the outer side 531 of the side portion 53 of the connecting member 50.

[0096] See also Figure 2 , Figure 3 and Figure 4 In some embodiments, the second sealing member 70 is located on the bottom wall 35 of the rod body 30 and blocks the gap between the side wall 33 and the side portion 53 of the rod body 30 .

[0097] Specifically, the second sealing member 70 can be connected to the bottom wall 35 of the rod body 30 in a non-detachable manner, and the non-detachable connection manner includes but is not limited to bonding, etc. The second sealing member 70 covering the bottom wall 35 of the rod body 30 can provide a more secure sealing effect for the connecting member 50 and the rod body 30, and prevent dirt from accumulating in the gap between the side wall 33 and the side portion 53 of the rod body 30. The second sealing member 70 disposed on the bottom wall 35 of the rod body 30 can also enhance the connection stability between the connecting member 50 and the rod body 30, and reduce looseness when the electric toothbrush head 100 vibrates.

[0098] See also Figure 3 and Figure 4 In some embodiments, the second sealing member 70 is a rubber sealing ring.

[0099] Specifically, the second seal 70 can be a separately formed seal ring, which can fill and close the gap between the side wall 33 and the side portion 53 of the rod body 30. The second seal 70 can be placed in the gap in a non-detachable connection manner, and the non-detachable connection manner includes but is not limited to bonding. The second seal 70 can also be placed in the gap in a detachable connection manner, and the detachable connection manner includes but is not limited to interference fit. When using interference fit, the outer diameter of the second seal 70 is slightly larger than the maximum outer contour dimension of the gap. During installation, the second seal 70 is compressed and pushed into the gap between the side wall 33 and the side portion 53 of the rod body 30 along the length direction X of the rod body 30, and the gap is closed by the elasticity of the rubber. The seal ring can not only seal the gap between the side wall 33 and the side portion 53 of the rod body 30, but also has simple molding.

[0100] See also Figure 3 and Figure 4 In some embodiments, the second sealing member 70 is a sealant.

[0101] Specifically, the second sealing member 70 can be directly filled and cured at the gap between the side wall 33 and the side portion 53 of the rod body 30, and the filling and curing methods include but are not limited to direct injection and coating. The sealant simplifies the sealing process and has a more comprehensive sealing for the irregular gap between the side wall 33 and the side portion 53 of the rod body 30.

[0102] See also Figure 2 , Figure 3 and Figure 4 In some embodiments, the covering member 90 at least covers the bottom wall 35 of the rod body 30 and the bottom 52 of the connecting member 50 , and the covering member 90 forms the second sealing member 70 .

[0103] Specifically, the second seal 70 is integrally formed in a covering form on the bottom wall 35 of the rod body 30 and the bottom 52 of the connecting piece 50, which can simplify the production process and form a continuous sealing area for the bottom wall 35 of the rod body 30 and the bottom 52 of the connecting piece 50, thereby enhancing the overall sealing effect of the electric toothbrush head 100 and providing a cushioning effect when the electric toothbrush head 100 falls, thereby reducing damage.

[0104] See also Figure 2 , Figure 3 and Figure 4 In some embodiments, when the covering member 90 forms the second sealing member 70 , the first sealing member 60 and the second sealing member 70 are an integral structure.

[0105] Specifically, the integrally formed first seal 60 and second seal 70 can provide a more continuous sealing method for the electric toothbrush head 100, reducing potential gaps. In addition, the integrally formed first seal 60 and second seal 70 can make it easier to replace.

[0106] See also Figure 2 , Figure 3 and Figure 4 In some embodiments, when the covering member 90 forms the second sealing member 70 , the covering member 90 also covers the outer side 333 of the side wall 33 of the rod body 30 .

[0107] Specifically, the covering member 90 wrapped around the outer side 333 of the side wall 33 of the rod body 30 can provide a shock absorbing effect for the side wall 33 of the rod body 30, thereby preventing the side wall 33 of the rod body 30 from breaking when the electric toothbrush head 100 falls.

[0108] See also Figure 2 , Figure 3 and Figure 4 In some embodiments, when the covering member 90 forms the second seal 70 , the covering member 90 also covers all areas of the outer side 333 of the side wall 33 of the rod body 30 , all areas of the bottom wall 35 of the rod body 30 , and all areas of the brush body 10 except the bristles 20 .

[0109] Specifically, the covering member 90 not only covers the inner side 331 of the side wall 33 of the rod body 30 to form the second sealing member 70, but also covers all areas of the outer side 333 of the side wall 33 of the rod body 30, all areas of the bottom wall 35 of the rod body 30, and all areas of the brush body 10 except the bristles. The covering member 90 wrapped in all areas of the outer side 333 of the side wall 33 of the rod body 30 and all areas of the bottom wall 35 of the rod body 30 can provide a shock absorbing effect for the side wall 33 of the rod body 30, thereby preventing the side wall 33 of the rod body 30 from breaking when the electric toothbrush head 100 falls. The covering member 90 wrapped in all areas of the bottom wall 35 of the rod body 30 can fill the gap between the motor and the bottom wall 35 of the rod body 30 when the input shaft of the motor is installed in the installation cavity 54, thereby preventing dirt from being deposited in the gap. The covering member 90 covering all areas of the brush body 10 except the bristles 20 can produce elastic deformation to prevent the brush body 10 from damaging the oral cavity due to collision. When forming the covering member 90, the covering member 90 at multiple positions can be integrally formed, so that the second sealing member 70 is more easily formed.

[0110] See also Figure 2 and Figure 3 In some embodiments, the covering member 90 covers the outer side 333 of the side wall 33 of the rod body 30 , the bottom wall 35 of the rod body 30 , and the brush body 10 , and both the rod body 30 and the covering member 90 are light-transmissive.

[0111] Specifically, the covering member 90 wrapped around the outer side 333 of the side wall 33 of the rod body 30 and the bottom wall 35 of the rod body 30 can provide a shock-absorbing effect for the rod body 30, thereby preventing the rod body 30 from breaking when the electric toothbrush head 100 falls. The covering member 90 wrapped around the brush body 10 can produce elastic deformation, thereby preventing the brush body 10 from damaging the oral cavity due to collision with the oral cavity. The rod body 30 and the covering member 90 can be made of light-transmitting materials such as PC, PET or acrylic. Both the rod body 30 and the covering member 90 are light-transmitting, allowing the user to clearly see the internal structure of the electric toothbrush head 100, thereby enhancing the aesthetics and product credibility, and making the entire electric toothbrush head 100 more technological.

[0112] See also Figures 5 to 7 In some embodiments, the inner side 533 of the side portion 53 of the coupling 50 is provided with a first fixing portion 57. The first fixing portion 57 is used to be fixedly connected to the output shaft of the motor. The first fixing portion 57 is a protrusion 571 protruding from the inner side 533 of the side portion 53 in the direction of the axis P of the mounting cavity 54, and the protrusion 571 is detachably connected to the output shaft. The protrusion 571 can be one, two, or more. At least one protrusion 571 includes a supporting surface 5711, and the output shaft includes a surface to be supported (not shown), and the supporting surface 5711 is in contact with the surface to be supported, and the supporting surface 5711 and the surface to be supported are both planes. The protrusions 571 are evenly distributed around the axis P of the mounting cavity 54.

[0113] In some embodiments, the first fixing portion 57 and the connecting member 50 may be an integral structure, that is, the first fixing portion 57 and the connecting member 50 are an integral structure. In other embodiments, the first fixing portion 57 and the connecting member 50 are split structures, that is, the first fixing portion 57 and the connecting member 50 are two different structures. When the first fixing portion 57 and the connecting member 50 are split structures, the first fixing portion 57 and the connecting member 50 may be combined together in a non-detachable connection manner, and the non-detachable connection manner includes but is not limited to bonding or welding. The axis P of the mounting cavity 54 is located in the length direction X of the rod body 30. The abutting surface 5711 of the protrusion 571 is the surface of the protrusion 571 closest to the bottom 52 of the connecting member 50. After the output shaft is inserted into the mounting cavity 54, the abutting surface of the output shaft abuts against the abutting surface 5711. The abutting surface 5711 can provide fixation for the output shaft in the length direction X on the one hand, and can prevent the output shaft from being excessively inserted into the mounting cavity 54 and damaging the structure of the connecting member 50 on the other hand. The first fixing portion 57 is fixedly connected to the output shaft of the motor, and can transmit vibration to the rod body 30. The output shaft of the motor and the first fixing portion are detachably connected, and the detachable design also makes it easy to remove the output shaft of the motor from the first fixing portion. The first fixing portion 57 can also prevent the electric toothbrush head 100 from rotating relative to the output shaft of the motor, ensuring that the electric toothbrush head 100 can only rotate synchronously with the output shaft of the motor.

[0114] See also Figure 6 and Figure 7 In some embodiments, the inner side 533 of the side portion 53 of the coupling 50 is further provided with a deformable second fixing portion 59. The second fixing portion 59 is closer to the bottom portion 52 than the first fixing portion 57. The second fixing portion 59 is used to be elastically connected to the output shaft. The first end 591 of the second fixing portion 59 is connected to the inner side 533 of the side portion 53. The second end 592 of the second fixing portion 59 is a free end. The second end 592 of the second fixing portion 59 can be deformed with the first end 591 of the second fixing portion 59 as a fulcrum.

[0115] In some embodiments, the second fixing portion 59 and the connecting member 50 may be an integral structure, that is, the second fixing portion 59 and the connecting member 50 are an integral structure. In other embodiments, the second fixing portion 59 and the connecting member 50 are split structures, that is, the second fixing portion 59 and the connecting member 50 are two different structures. When the second fixing portion 59 and the connecting member 50 are split structures, the second fixing portion 59 and the connecting member 50 may be combined together in a non-detachable connection manner, and the non-detachable connection manner includes but is not limited to bonding or welding. When the output shaft of the motor is inserted into the mounting cavity 54 of the connecting member 50, the second end 592 of the second fixing portion 59 can be deformed toward the axis P away from the mounting cavity 54 with the first end 591 of the second fixing portion 59 as a fulcrum, so as to avoid an installation path for the output shaft of the motor. After the output shaft of the motor is inserted into the mounting cavity 54 of the connecting member 50, the second end 592 of the second fixing portion 59 can be deformed toward the axis P close to the mounting cavity 54 with the first end 591 of the second fixing portion 59 as a fulcrum, thereby fixing the output shaft of the motor and preventing the electric toothbrush head 100 from rotating relative to the output shaft of the motor, ensuring that the electric toothbrush head 100 can only rotate synchronously with the output shaft of the motor.

[0116] See also Figure 3 In some embodiments, the length of the connecting member 50 is less than or equal to half the length of the rod body 30 .

[0117] Specifically, the length of the connector 50 can be 1 / 11, 1 / 10, 1 / 9, 1 / 8, 1 / 7, 1 / 6, 1 / 5, 1 / 4, 1 / 3 or 1 / 2 of the length of the rod body 30. When the length of the connector 50 is greater than or equal to half of the length of the rod body 30, the connector 50 will compress the air in the accommodating cavity 31, resulting in poor sealing effect of the rod body 30 or expansion and damage of the rod body 30. When the length of the connector 50 is less than or equal to half of the length of the rod body 30, it can be prevented that the connector 50 is too long to compress the air in the hollow part of the rod body 30, thereby preventing poor sealing effect of the rod body 30 or expansion and damage of the rod body 30.

[0118] See also Figure 2 and Figure 8 The electric toothbrush 1000 in the embodiment of the present application includes the electric toothbrush head 100 and the brush handle 300 in any one of the embodiments. The electric toothbrush head 100 is connected to the brush handle 300 through the mounting cavity 54.

[0119] Specifically, the connecting piece 50 in the electric toothbrush head 100 is provided with a through hole 55 due to its own positioning molding. The first sealing piece 60 is installed in the through hole 55, which can block the connection between the installation cavity 54 and the accommodating cavity 31, and prevent the liquid from entering the installation cavity 54 from the bottom 52 of the connecting piece 50 and then entering the accommodating cavity 31 through the through hole 55. On the one hand, it can avoid the increase of the weight of the electric toothbrush head 100 and ensure that the amplitude of the vibration of the electric toothbrush head 100 is not affected, thereby ensuring the cleaning effect of the electric toothbrush; on the other hand, it can keep the inside of the electric toothbrush head 100 dry and fresh, avoid liquid corrosion inside the electric toothbrush head 100, and extend the service life of the electric toothbrush head 100; on another hand, the dryness and freshness of the inside of the electric toothbrush head 100 can avoid the breeding of bacteria and ensure the health of the oral cavity to be cleaned.

[0120] In the description of this specification, the descriptions with reference to the terms "certain embodiments", "in an example", "exemplarily", etc., mean that the specific features, structures, materials or characteristics described in conjunction with the embodiments or examples are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

[0121] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. An electric toothbrush head, characterized in that: include: A brush body, wherein bristles are provided on the brush body; A rod body, one end of which is connected to the brush body, and the rod body is provided with a receiving cavity penetrating the other end; A connecting piece installed in the accommodating cavity, the connecting piece comprising a top and a bottom opposite to each other, and being provided with a mounting cavity penetrating the bottom and a through hole communicating with the mounting cavity, wherein in the length direction of the connecting piece, the top is closer to the brush body than the bottom; and A first sealing member is disposed in the through hole and blocks the communication between the installation cavity and the accommodating cavity.

2. The electric toothbrush head according to claim 1, characterized in that: The through hole is arranged at the top; and / or The coupling member further includes a side portion connecting the top portion and the bottom portion, and the through hole is disposed in the side portion.

3. The electric toothbrush head according to claim 2, characterized in that: When the through holes are arranged on the side, the number of the through holes includes two, and the two through holes penetrate in one direction.

4. The electric toothbrush head according to claim 1, characterized in that: The first sealing component is formed in the through hole of the connecting component by a secondary injection molding process; or, the first sealing component is interference-fitted in the through hole of the connecting component.

5. The electric toothbrush head according to claim 1, characterized in that: The connecting piece is an integral structure, and the area on the connecting piece except the through hole is a closed structure that blocks the communication between the installation cavity and the accommodating cavity.

6. The electric toothbrush head according to claim 1, characterized in that: The portion of the rod body from the top of the connecting piece to the brush body is an integral solid structure.

7. The electric toothbrush head according to claim 1, characterized in that: The coupling member further comprises a side portion connecting the top portion and the bottom portion; the electric toothbrush head further comprises: A second sealing member is connected to both the rod body and the connecting member and is used to seal a gap between an inner side of the side wall of the rod body and an outer side of the side portion.

8. The electric toothbrush head according to claim 7, characterized in that: The second sealing member is located between the inner side of the side wall of the rod body and the outer side of the side portion, and blocks the gap between the inner side of the side wall of the rod body and the outer side of the side portion.

9. The electric toothbrush head according to claim 8, characterized in that: The second sealing member is a rubber sealing ring; or The second sealing member is a sealant; or The electric toothbrush head further comprises a covering member, wherein the covering member at least covers the inner side of the side wall of the rod body, and the covering member located on the inner side of the side wall of the rod body forms the second sealing member; or The electric toothbrush head further comprises a covering member, wherein the covering member at least covers the outer side of the side portion of the connecting member, and the covering member located on the outer side of the side portion forms the second sealing member.

10. The electric toothbrush head according to claim 7, characterized in that: The second sealing member is located on the bottom wall of the rod body and blocks the gap between the side wall of the rod body and the side portion.

11. The electric toothbrush head according to claim 10, characterized in that: The second sealing member is a rubber sealing ring; or The second sealing member is a sealant; or The electric toothbrush head further comprises a covering member, wherein the covering member at least covers the bottom wall of the rod body and the bottom of the connecting member, and the covering member forms the second sealing member.

12. The electric toothbrush head according to claim 11, characterized in that: In the case where the covering member forms the second sealing member, the first sealing member and the second sealing member are an integral structure.

13. The electric toothbrush head according to claim 9 or 11, characterized in that: In the case where the covering member forms the second sealing member, the covering member also covers the outer side of the side wall of the rod body.

14. The electric toothbrush head according to claim 13, characterized in that: In the case where the covering member forms the second sealing member, the covering member covers all areas of the outer side of the side wall of the rod body, all areas of the bottom wall of the rod body, and all areas of the brush body except the bristles.

15. The electric toothbrush head according to claim 1, characterized in that: The electric toothbrush head also includes a covering member, which covers the outer side of the side wall of the rod body, the bottom wall of the rod body and the brush body, and both the rod body and the covering member are light-transmissive.

16. The electric toothbrush head according to claim 1, characterized in that: The connecting member also includes a side portion connecting the top and the bottom, and a first fixing portion is provided on the inner side of the side portion, and the first fixing portion is used to be fixedly connected to the output shaft of the motor; the first fixing portion is a protrusion protruding from the inner side of the side portion toward the axial direction of the installation cavity, and the protrusion is detachably connected to the output shaft; the protrusion includes a supporting surface, and the output shaft includes a surface to be supported, and the supporting surface is in contact with the surface to be supported, and both the supporting surface and the surface to be supported are planes; there are at least two protrusions, and at least two of the protrusions are evenly distributed around the axis of the installation cavity.

17. The electric toothbrush head according to claim 16, characterized in that: A deformable second fixing portion is also provided on the inner side of the side portion, wherein the second fixing portion is closer to the bottom than the first fixing portion, and the second fixing portion is used to be elastically connected to the output shaft; a first end of the second fixing portion is connected to the inner side of the side portion, and a second end of the second fixing portion is a free end, and the second end of the second fixing portion can be deformed with the first end of the second fixing portion as a fulcrum.

18. The electric toothbrush head according to claim 1, characterized in that: The length of the connecting piece is less than or equal to half the length of the rod body.

19. An electric toothbrush, characterized in that: include: The electric toothbrush head according to any one of claims 1 to 18, and A brush handle, wherein the electric toothbrush head is connected to the brush handle through the mounting cavity.

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