Electric toothbrush and toothbrush main machine thereof

Abstract

The utility model discloses an electric toothbrush and a toothbrush host thereof, the toothbrush host comprises a first shell and a second shell, the first shell comprises a first section and a second section along the length direction of the first shell, the first section is connected with the second section, or the first section and the second section are integrally formed; the second shell sleeves the outer surface of the second section along the length direction of the second section; wherein at least part of the first shell is made of plastic, at least part of the length of the outer surface of the second shell is made of metal, and the second shell is in sealing contact with at least part of the second section. Compared with the prior art, the toothbrush main machine comprises the first shell and the second shell, at least part of the first shell is made of the plastic material, the first shell is easy to stretch and deform, the production and processing difficulty is lowered, and arrangement of internal electrical components is more flexible; and the outer surface of the second shell is made of metal, so that the holding comfort of a user is improved.

Description

Technical Field

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

[0002] An electric toothbrush is a cleaning tool that uses electricity to generate power to make the brush head vibrate or rotate. It is more efficient than traditional manual toothbrushes and can provide a deeper cleaning effect.

[0003] The handle of the electric toothbrush in the related art is set to be pure metal. Although it can improve the comfort of the user's holding, metal is difficult to shape during production and processing, and has a high shielding effect on the electrical components inside the toothbrush, affecting the normal use function of the electrical components. Utility Model Content

[0004] In view of the deficiencies in the prior art, the utility model provides an electric toothbrush and a toothbrush host thereof, which can reduce the production difficulty and reduce the shielding effect.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the following technical solutions:

[0006] A toothbrush host comprises a first shell and a second shell, wherein the first shell comprises a first section and a second section along its length direction, wherein the first section is connected to the second section, or the first section and the second section are integrally formed; the second shell is sleeved on the outer surface of the second section, and the first section is exposed; wherein at least part of the first shell is made of plastic, and the outer surface of at least part of the length of the second shell is made of metal, and the second shell is in sealing contact with at least part of the second section.

[0007] As one implementation manner, a step portion is provided at one end of the first section close to the second section, and the second shell is sleeved on the outer surface of the second section and abuts against the step portion.

[0008] As one implementation manner, along the radial direction of the first shell, the outer surface of the step portion is higher than the outer surface of the second shell.

[0009] As one implementation manner, along the radial direction of the first shell, the height difference between the outer surface of the step portion and the outer surface of the second shell is Z mm, 0≤Z<0.2.

[0010] As one implementation manner, the wall thickness of the first section is greater than the wall thickness of the second shell.

[0011] As one implementation manner, the first section is provided with an output hole, and the output hole is used to connect the brush head; along the radial direction of the first shell, the outer surface of the first section is higher than the outer surface of the second shell.

[0012] As one implementation manner, the first section is made of plastic, and the second shell is made of metal.

[0013] In one embodiment, the first section is provided with an output hole, the material of the end of the first section close to the output hole is metal, the material of the end of the first section away from the output hole is plastic, and the material of the second section is plastic;

[0014] The material of the second shell is metal, or the material of one end of the second shell close to the first section is metal, and the material of one end of the second shell away from the first section is plastic.

[0015] As one implementation manner, the second shell adopts an integrally formed structure, and the length of the second shell is between 45 mm and 100 mm.

[0016] As one embodiment, a positioning groove is provided on the side of the second section facing the second shell, and a positioning portion is provided on the side of the second shell facing the second section; or, a positioning portion is provided on the side of the second section facing the second shell, and a positioning groove is provided on the side of the second shell facing the second section; the positioning portion is used to be plugged into the positioning groove to limit the rotation of the second shell around the length direction of the second section.

[0017] As one of the embodiments, along the circumferential direction of the second section, a plurality of limit strips are provided at intervals on the side of the second section facing the second shell, the limit strips extend along the length direction of the second section, and the plurality of limit strips abut against the inner side surface of the second shell; or, along the circumferential direction of the second section, a plurality of limit strips are provided at intervals on the side of the second shell facing the second section, the limit strips extend along the length direction of the second section, and the plurality of limit strips abut against the outer side surface of the second section, so that the second shell and the second section are interference connected.

[0018] As one embodiment, one of the first shell and the second shell is provided with an anti-foolproof protrusion, and the other of the first shell and the second shell is provided with an anti-foolproof interface, and the anti-foolproof protrusion is inserted into the anti-foolproof interface along the length direction of the second section.

[0019] As one embodiment, the toothbrush main unit includes a first seal, which is disposed at the end of the second section, and the inner side surface of the second shell presses against the first seal to seal the gap between the second section and the second shell.

[0020] As one embodiment, the first sealing member includes a sealing ring and a limiting convex strip, the sealing ring is sleeved on one end of the second section close to the first section, the limiting convex strip is connected to the outer circumference of the sealing ring and abuts against the second shell.

[0021] As one embodiment, the second section is provided with a glue dispensing groove on at least one side of the first sealing member, the glue dispensing groove is used to accommodate an adhesive, and the adhesive is used to bond and seal the second shell and the second section.

[0022] As one embodiment, the top surface of the second shell facing the first section is not perpendicular to the length direction of the second section to form a first inclined surface, the top surface of the first section facing the second shell is not perpendicular to the length direction of the second section to form a second inclined surface, and the first inclined surface and the second inclined surface abut against each other to limit the rotation of the second shell around the length direction of the second section; or, the top surface of the second shell facing the first section is perpendicular to the length direction of the second section, the top surface of the first section facing the second shell is perpendicular to the length direction of the second section, and the top surface of the second shell abuts against the top surface of the first section.

[0023] As one embodiment, the first section and the second section are connected by threading or nano injection molding; and / or,

[0024] The second section and the second shell are connected by secondary injection molding or nano injection molding.

[0025] As one embodiment, an output hole is formed at one end of the first section away from the second section, and the output hole is used for the output shaft of the movement to extend out. The second section has a central axis, and the center of the output hole deviates from the central axis.

[0026] As one embodiment, the toothbrush main body includes a bottom cover, and the end of the second shell away from the first section is provided with a connecting portion extending beyond the second section, and the connecting portion is connected to the bottom cover to seal the end of the second shell away from the first section.

[0027] As one embodiment, the toothbrush main unit includes a second sealing member, which is connected to the bottom cover and elastically abuts against the inner side surface of the connecting portion, and is used to seal the connection between the bottom cover and the connecting portion.

[0028] As one implementation manner, the wall thickness of the second shell is set to L1 mm, wherein 0.5<L1<1.5.

[0029] As one implementation manner, along the length direction of the second section, the length of the first section is set to L2 mm, and the length of the second shell is set to L3 mm, wherein 1 / 3<L2 / L3<3 / 2.

[0030] As one implementation manner, the wall thickness of the second section is set to L4 mm, wherein 1<L4<2.5.

[0031] As one implementation method, -0.1 mm<L2-L3<0.1 mm.

[0032] As one embodiment, the toothbrush main unit includes a movement, which is installed in the first shell, and a first connecting structure is provided on the side of the movement facing the first shell, and a second connecting structure is provided on the side of at least one of the first section and the second section facing the movement; wherein, one of the first connecting structure and the second connecting structure is a slide groove, and the other of the first connecting structure and the second connecting structure is a slide rail, and the slide rail and the slide groove are slidably matched along the length direction of the second section.

[0033] As one implementation manner, the slide rail is provided with a limiting bag toward the slide slot, and the limiting bag elastically abuts against the slide slot.

[0034] As one embodiment, the toothbrush host includes a communication component, which is located in the first section and connected to the inner side surface of the first section, and is opposite to the functional hole.

[0035] As one embodiment, a material reduction groove is provided on the inner side surface of the first section, the communication component is assembled in the material reduction groove, and the wall thickness of the first section located in the material reduction groove is smaller than the wall thickness of the rest of the first section.

[0036] As one implementation manner, a functional hole is formed in the first section, and the functional hole is used to install at least one of a button portion and a display component.

[0037] As one embodiment, the toothbrush host includes a display component, the display component includes a display component and a display shell, the display component is arranged on the inner side of the first section, the display shell is installed in the functional hole, and the display component and the display shell are arranged opposite to each other.

[0038] Another object of the present invention is to provide an electric toothbrush, comprising a brush head and a toothbrush host according to any one of the above embodiments, wherein the toothbrush host is connected to the brush head.

[0039] The beneficial effect of the utility model is that the application provides an electric toothbrush and a toothbrush host thereof, the toothbrush host comprises a first shell and a second shell, the first shell is connected to the brush head, and the second shell is used for holding; specifically, the first shell comprises a first section and a second section along its length direction, the first section is connected to the second section, or the first section and the second section are integrally formed; the second shell is sleeved on the outer surface of the second section; wherein, at least part of the first shell is made of plastic, the outer surface of at least part of the length of the second shell is made of metal, and at least part of the connection between the second shell and the second section is in sealed contact. Compared with the prior art, the toothbrush host of the present application comprises a first shell and a second shell, the first shell is at least partially made of plastic material, which is easy to stretch and deform, reducing the difficulty of production and processing, and plays a role in isolating the magnetic field, avoiding the metal on the surface of the second shell from shielding the signal of the internal electrical components, making the setting of the internal electrical components more flexible; the outer surface of the second shell is metal, which improves the comfort of the user holding. The electric toothbrush using the above toothbrush host greatly reduces the difficulty of manufacturing, improves production efficiency, and improves the comfort of the user. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 A schematic structural diagram of an electric toothbrush according to an embodiment of the utility model is shown;

[0041] Figure 2 A schematic diagram of the structure decomposition of a toothbrush host according to an embodiment of the utility model is shown;

[0042] Figure 3 A cross-sectional schematic diagram of an electric toothbrush according to an embodiment of the utility model is shown;

[0043] Figure 4 for Figure 3 Enlarged view of point E in the middle;

[0044] Figure 5 A schematic diagram of the structure decomposition of an electric toothbrush according to an embodiment of the utility model is shown;

[0045] Figure 6 Another schematic diagram of the structure decomposition of a toothbrush host according to an embodiment of the utility model is shown;

[0046] Figure 7 Another structural decomposition diagram of a toothbrush host according to an embodiment of the utility model is shown;

[0047] Figure 8 for Figure 7 The enlarged view of point A in the middle;

[0048] Fig. 9 A cross-sectional schematic diagram of a toothbrush host according to an embodiment of the utility model is shown;

[0049] Fig.10 for Fig. 9 The enlarged view of point B in the middle;

[0050] Fig.11 Another cross-sectional schematic diagram of a toothbrush host according to an embodiment of the utility model is shown;

[0051] Fig.12 for Fig.11 Enlarged view of point C in the middle;

[0052] Fig.13 for Fig.11 The enlarged view of point D in the middle;

[0053] Fig.14 A front view schematic diagram of a toothbrush host according to an embodiment of the utility model is shown;

[0054] Fig.15 The figure shows the internal schematic diagram of a toothbrush host according to an embodiment of the utility model.

[0055] Figure numerals: 10, electric toothbrush; X, length direction; Y, radial direction; 1, toothbrush host; 2, brush head; 11, first shell; 12, second shell; 13, first seal; 14, movement; 15, second seal; 16, bottom cover; 17, communication component; 18, display component; 19, button part; 111, first section; 112, second section; 113, function hole; 114, second connection structure; 115, positioning part ; 116, limit strip; 117, fool-proof protrusion; 118, second inclined surface; 119, material reduction groove; 1111, output hole; 1112, step portion; 1121, glue dispensing groove; 121, positioning groove; 122, fool-proof interface; 123, first inclined surface; 124, connecting portion; 131, sealing ring; 132, limit convex strip; 141, first connecting structure; 142, limit package; 181, display component; 182, display shell. DETAILED DESCRIPTION

[0056] In the present invention, the terms "disposed", "provided with", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0057] The orientation or position relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "radial", "circumferential", etc. are based on the orientation or position relationship shown in the drawings and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0058] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0059] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those skilled in the art, the specific meanings of these terms in this utility model can be understood according to specific circumstances.

[0060] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0061] See also Figure 1 The embodiment of the present application provides an electric toothbrush 10, including a brush head 2 and a toothbrush host 1, the brush head 2 is connected to one end of the toothbrush host 1 and is connected to the power output end of the toothbrush host 1, and the toothbrush host 1 is used to drive the brush head 2 to vibrate or rotate to achieve the function of cleaning teeth.

[0062] It should be noted that the toothbrush host 1 includes electrical components inside, such as a motor for providing power, and the output end of the motor is connected to the brush head 2 to provide power for the brush head 2 to vibrate or rotate.

[0063] See also Figure 2 For the sake of clarity, Figure 2X represents the length direction. The toothbrush host 1 includes a first shell 11 and a second shell 12. The first shell 11 is connected to the brush head 2, and the second shell 12 is used for holding. Specifically, the first shell 11 includes a first section 111 and a second section 112 along its length direction X. The first section 111 is connected to the second section 112, or the first section 111 and the second section 112 are integrally formed. The second shell 12 is sleeved on the outer surface of the second section 112 along the length direction of the second section 112, and the first section 111 is exposed. The first shell 11 is at least partially made of plastic, and the outer surface of at least part of the length of the second shell 12 is made of metal, and the second shell 12 is in sealing contact with at least part of the second section 112.

[0064] In actual application, the first shell 11 is divided into a first section 111 and a second section 112 along its length direction X. The first section 111 is connected to the brush head 2, and the second shell 12 is sleeved on the outer peripheral surface of the second section 112 for the user to hold; therefore, at least part of the material of the first shell 11 is plastic. Specifically, the second section 112 can be made of plastic material. Plastic is easy to stretch and deform, and can be matched with the setting of the internal electrical components of the second section 112 to provide a more flexible installation space, thereby reducing the production difficulty of the electric toothbrush 10. At the same time, plastic is used as an insulating material. When the second shell 12 is sleeved on the outer periphery of the second section 112, the second section 112 can isolate the magnetic field, thereby preventing the metal on the surface of the second shell 12 from shielding the signals of the internal electrical components and meeting the normal use function of the electrical components.

[0065] The second shell 12 is a portion for the user to hold, and its outer surface is made of metal. The metal material has good strength and durability, can withstand greater gripping force and will not be damaged after long-term use. The outer surface is smoother, which improves the comfort of the user's holding.

[0066] Compared with the prior art, the toothbrush host 1 of the present application includes a first shell 11 and a second shell 12. The first shell 11 is at least partially made of plastic material, which is easy to stretch and deform, reducing the difficulty of production and processing, and plays a role in isolating the magnetic field, preventing the metal on the surface of the second shell 12 from shielding the signals of the internal electrical components, making the arrangement of the internal electrical components more flexible; the outer surface of the second shell 12 is metal, which improves the comfort of the user holding it. The electric toothbrush 10 using the above toothbrush host 1 greatly reduces the difficulty of manufacturing, improves production efficiency, and improves the comfort of the user.

[0067] See also Figure 3 For the sake of clarity, Figure 3 Y represents the radial direction. A step portion 1112 is provided at one end of the first section 111 close to the second section 112 . The second housing 12 is sleeved on the outer surface of the second section 112 and abuts against the step portion 1112 .

[0068] In actual applications, the diameter of the first section 111 is greater than the diameter of the second section 112, so a step portion 1112 is formed at the intersection of the first section 111 and the second section 112. When the second shell 12 is sleeved on the second section 112, the second shell 12 abuts against the step portion 1112. This arrangement can, on the one hand, improve the aesthetics of the connection between the first shell 11 and the second shell 12, and on the other hand, the step portion 1112 can prevent water from flowing into the interior of the second shell 12.

[0069] Specifically, along the radial direction Y of the first shell 11, the outer surface of the step portion 1112 is higher than the outer surface of the second shell 12. In normal use, when the water flow of the brush head 2 flows along the first section 111 to the second shell 12, since the step portion 1112 is higher than the outer surface of the second shell 12, the water flow will directly slide out after flowing to the step portion 1112, avoiding flowing into the connection between the first section 111 and the second shell 12.

[0070] More specifically, along the radial direction Y of the first housing 11 , the height difference between the outer surface of the step portion 1112 and the outer surface of the second housing 12 is Z mm, 0≤Z<0.2.

[0071] The height difference between the outer surface of the step portion 1112 and the outer surface of the second shell 12 is within 0.2 mm, which can prevent water from flowing into the connection between the second shell 12 and the first section 111, and can make the connection between the first shell 11 and the second shell 12 smoother without large fluctuations, thereby improving the aesthetics of the device. For example, Z can be 0.1 mm, 0.12 mm, 0.13 mm, 0.14 mm, 0.15 mm, etc.

[0072] Of course, as long as the outer surface of the first section 111 at any point along its length direction X is higher than the outer surface of the second shell 12, it can play a role in blocking the water flow. Therefore, the outer surface of the step portion 1112 and the outer surface of the second shell 12 may have no height difference, so that the connection between the first section 111 and the second shell 12 can achieve a smooth transition, further improving the aesthetic appearance of the toothbrush main unit 1.

[0073] In one embodiment, the wall thickness of the first section 111 is greater than the wall thickness of the second shell 12; specifically, since the first section 111 is used to connect the brush head 2, a motor for driving the brush head 2 to rotate is installed inside the first section 111. The thicker thickness of the first section 111 helps to protect the internal motor and isolate the heat generated by the internal motor. At the same time, since the second shell 12 is made of metal and has a large weight, in order to ensure that the overall weight of the electric toothbrush 10 is evenly distributed, setting the thickness of the first section 111 to be greater than the thickness of the second shell 12 can balance the center of gravity, making it more comfortable and easier for users to control when using it.

[0074] More specifically, along the radial direction Y of the first housing 11 , the outer surface of the first segment 111 is higher than the outer surface of the second housing 12 .

[0075] The brush head 2 is connected to the first section 111. When the electric toothbrush 10 is in use, water flows from the brush head 2 to the first section 111, and flows along the first section 111 to the second shell 12, making the outer surface of the first section 111 higher than the outer surface of the second shell 12, that is, there is a height difference between the outer surface of the first section 111 and the outer surface of the second shell 12. This arrangement allows the water to directly slide down from the outer surface of the first section 111 when flowing through the connection between the first section 111 and the second shell 12, thereby preventing the water from flowing into the connection between the two. In addition, during the manufacturing process, there may be slight differences or gaps in size between the parts. This height difference can be "tolerance absorbed" or "tolerance compensated". The outer surface of the second shell 12 is still lower than the outer surface of the first section 111, so that the overall device will not cause water to flow into the second shell 12 due to slight dimensional errors.

[0076] In one embodiment, the first section 111 may be made of plastic, and the second housing 12 may be made of metal.

[0077] In actual applications, the first section 111 is one end close to the brush head 2. Usually, functional components need to be set on the first section 111, such as the button part 19 or the display part 18. The first section 111 is made of plastic material to facilitate its plasticity and it is more convenient to set functional components; the material of the second shell 12 is metal, which is conducive to improving the comfort of user holding. Compared with the outer surface material of the second shell 12 mentioned above being metal, the overall metal solution is simpler in production design and can be made by an integrated molding process.

[0078] In one embodiment, the first section 111 is provided with an output hole 1111 for connecting the brush head 2, the material of the end of the first section 111 close to the output hole 1111 can be metal, the material of the end of the first section 111 away from the output hole 1111 can be plastic, the material of the second section 112 can be plastic, and the material of the second shell 12 can be metal.

[0079] In this embodiment, different from the above embodiment, the first section 111 can adopt a structure of part plastic and part metal. Specifically, the first section 111 includes an upper part and a lower part connected in sequence along its length direction X, and the upper part is provided with an output hole 1111. The material of the upper part is metal, and the material of the lower part is plastic.

[0080] The upper part is close to the brush head 2. The upper part is made of metal to improve the connection strength between the first section 111 and the brush head 2. The lower part can be made of plastic to facilitate the installation of functional components. The second section 112 is externally covered with a second shell 12 made of metal. Therefore, the second section 112 is preferably made of plastic to isolate the metal magnetic field.

[0081] It can be understood that, in some other embodiments, the first section 111 may include multiple parts along its length direction X, not limited to the upper and lower parts described above.

[0082] In one embodiment, the material of the end of the second shell 12 close to the first section 111 is metal, and the material of the end of the second shell 12 away from the first section 111 is plastic; the second shell 12 adopts a solution of partial metal and partial plastic. On the one hand, the metal material can increase the holding feel, and on the other hand, the partial plastic can reduce the weight of the holding end and facilitate stretching and shaping.

[0083] It is understandable that when the lower portion of the first section 111 is made of plastic, the connection between the first section 111 and the second section 112 can be an integrally formed connection or a detachable connection, which is not limited in the present application.

[0084] In one embodiment, the second shell 12 may adopt an integrally formed structure; such a configuration is conducive to reducing the difficulty of production design and improving production efficiency.

[0085] In one embodiment, the length of the second shell 12 is between 45 mm and 100 mm. Specifically, the length of the second shell 12 within this range is greater than a preset value, where the preset value refers to the length of the user's hand covering the electric toothbrush 10 when the user holds it. This setting is conducive to matching the holding habits of different users. Some users hold the lower part, while some users hold the higher part. By setting the length of the second shell 12 to be greater than the preset value, the user's hand is still located on the second shell 12 despite different holding postures, further improving the comfort of holding. For example, the length of the second shell 12 can be 46 mm, 47 mm, 48 mm, 49 mm, 50 mm, and other values.

[0086] See again Figure 2 The first section 111 is provided with a functional hole 113 , and the functional hole 113 is used to install at least one of the button portion 19 and the display component 18 .

[0087] It should be noted that the electric toothbrush 10 includes electrical components arranged inside the toothbrush host 1, such as a motor or a display component 18. The motor is used to provide power, and the display component 18 can be used to display the current working status and power status.

[0088] Based on this, the electric toothbrush 10 needs to be provided with other electrical components such as a button part 19 or a display part 18 for controlling the start and stop of the motor. A functional hole 113 is provided in the first section 111. The functional hole 113 provides an installation position for convenient installation of the button part 19 or the display part 18. Since the first section 111 is made of plastic, the functional hole 113 is provided in the first section 111 for easy processing and shaping. At the same time, when the user holds the second shell 12, the first section 111 is located above the user's palm, and the user's fingers can just touch the functional hole 113, which is convenient for the user to turn on and off the button part 19, and the operation is more convenient. At the same time, the display position will not be blocked by the user's holding, so that the user can observe the displayed information.

[0089] See also Figure 5 In one embodiment, the display component 18 may include a display element 181 and a display shell 182, wherein the display element 181 is connected to the inner side of the first section 111, and the display shell 182 is installed in the functional hole 113, and the display element 181 and the display shell 182 are arranged opposite to each other.

[0090] Specifically, the display component 181 is connected to the inner side of the first section 111 and is arranged opposite to the position of the functional hole 113. The display shell 182 is installed in the functional hole 113 for transmitting light and protecting the internal display component 181. The display component 181 can be a display screen for displaying images, text and other information. The display shell 182 is made of transparent material, which is convenient for users to observe the display information of the display screen through the display shell 182.

[0091] It is understandable that the display shell 182 and the functional hole 113 may be sealed to prevent water from seeping into the interior of the first section 111 through the gap.

[0092] See also Figure 6 In one embodiment, a positioning portion 115 is provided on the side of the second section 112 facing the second shell 12, and a positioning groove 121 is opened on the side of the second shell 12 facing the second section 112; wherein the positioning groove 121 and the positioning portion 115 both extend along the length direction of the second section 112, and the positioning portion 115 is used to be plugged into the positioning groove 121 to limit the second shell 12 from rotating around the length direction of the second section 112.

[0093] In actual application, the positioning portion 115 and the positioning groove 121 both extend along the length direction of the second section 112. When the second shell 12 and the second section 112 are connected, the positioning portion 115 and the positioning groove 121 can play a guiding role, which is convenient for the precise positioning of the second shell 12 and the second section 112. At the same time, the positioning portion 115 is inserted into the positioning groove 121 along the length direction. Through the limiting effect of the positioning portion 115 and the positioning groove 121, the second shell 12 can be prevented from rotating relative to the second section 112, thereby preventing the second shell 12 and the second section 112 from slipping and affecting user use.

[0094] It is understandable that in other embodiments, a positioning groove 121 may be provided on the side of the second section 112 facing the second shell 12, and a positioning portion 115 may be provided on the side of the second shell 12 facing the second section 112, which can also play the above-mentioned role of limiting the rotation of the second shell 12 around the length direction of the second section 112. The present application does not impose any limitation on this.

[0095] See also Figure 7 In one embodiment, along the circumferential direction of the second section 112, a plurality of limiting strips 116 are arranged at intervals on one side of the second section 112 facing the second shell 12. The limiting strips 116 extend along the length direction of the second section 112, and the plurality of limiting strips 116 abut against the inner side surface of the second shell 12, so that the second shell 12 and the second section 112 are connected by interference. Specifically, the limiting strips 116 protrude in a direction away from the second section 112. When the second shell 12 is sleeved on the second section 112, the inner side surface of the second shell 12 abuts against the limiting strips 116, so that the second shell 12 and the second section 112 are interference-fitted, so that the connection between the two is more stable; more specifically, the limiting strips 116 can be arranged evenly at intervals along the circumference of the second section 112, so as to avoid eccentricity when the second shell 12 is sleeved on the outer periphery of the second section 112.

[0096] It can be understood that in other embodiments, along the circumferential direction of the second section 112, a plurality of limit strips 116 may be provided at intervals on one side of the second shell 12 facing the second section 112, and the limit strips 116 extend along the length direction of the second section 112. The plurality of limit strips 116 abut against the outer side surface of the second section 112. Such an arrangement can also make the connection between the second shell 12 and the second section 112 more stable.

[0097] See also Figure 7 and Figure 8 One of the first shell 11 and the second shell 12 is provided with an anti-foolproof protrusion 117, and the other of the first shell 11 and the second shell 12 is provided with an anti-foolproof interface 122, and the anti-foolproof protrusion 117 is inserted into the anti-foolproof interface 122 along the length direction of the second section 112.

[0098] In one embodiment, an anti-foolproof protrusion 117 can be provided on the first shell 11. Specifically, the anti-foolproof protrusion 117 is provided at the end of the first section 111 close to the second section 112, and an anti-foolproof interface 122 is provided at the end of the second shell 12 close to the first section 111. Through the positioning function of the anti-foolproof protrusion 117 and the anti-foolproof interface 122, the second shell 12 can be quickly and accurately installed on the outside of the first shell 11 to avoid operating errors caused by negligence of the installer; at the same time, the anti-foolproof interface 122 can limit the excessive insertion of the second shell 12 to avoid excessive abutment between the second shell 12 and the first section 111, thereby causing deformation and damage to the second shell 12 or the first section 111; and the anti-foolproof interface 122 can also ensure that the second shell 12 is inserted into the correct position to prevent the second shell 12 from being inserted into place, resulting in a gap between the second shell 12 and the first section 111, causing water seepage.

[0099] See again Figure 6 The toothbrush host 1 further includes a first seal 13 , which is disposed at the end of the second section 112 , and the inner side surface of the second shell 12 presses against the first seal 13 to seal the gap between the second section 112 and the second shell 12 .

[0100] Specifically, the first seal 13 can be arranged at the end of the second section 112 close to the first section 111. When water flows downward along the first section 111, that is, flows in the direction of the second shell 12, the water easily flows into the connection position between the first section 111 and the second shell 12. Therefore, the first seal 13 is arranged at the end of the second section 112 close to the first section 111. When the second shell 12 is sleeved on the second section 112, the first seal 13 abuts against the inner side surface of the second shell 12. The first seal 13 blocks the water flowing down from the first section 111 from penetrating into the second shell 12, so as to avoid leakage between the second shell 12 and the second section 112, which affects the service life of the electric toothbrush 10.

[0101] It can be understood that the first seal 13 can be arranged at the end of the second section 112 close to the first section 111, or at the end of the second section 112 away from the first section 111. That is, the first seal 13 can be arranged at both ends where the second section 112 is connected to the second shell 12 to enhance the sealing between the two.

[0102] The first sealing member 13 includes a sealing ring 131 and a limiting convex strip 132 . The sealing ring 131 is sleeved on one end of the second section 112 close to the first section 111 . The limiting convex strip 132 is connected to the outer periphery of the sealing ring 131 and abuts against the second housing 12 .

[0103] In practical applications, the sealing ring 131 is sleeved on the outer periphery of the second section 112, the limiting convex strip 132 is circumferentially connected to the sealing ring 131 and protrudes in a direction away from the sealing ring 131, and the limiting convex strip 132 is used to abut against the inner side surface of the second shell 12, which can increase the friction between the first sealing member 13 and the second shell 12 and prevent the second shell 12 from rotating relative to each other. It can be understood that a plurality of limiting convex strips 132 can be provided along the height direction of the sealing ring 131 to enhance the sealing effect.

[0104] See also Figure 7 and Figure 8 The second section 112 is provided with a glue dispensing groove 1121 on at least one side of the first sealing member 13 , and the glue dispensing groove 1121 is used to contain an adhesive, and the adhesive is used to bond and seal the second shell 12 and the second section 112 .

[0105] In actual application, the second section 112 is on one side of the first sealing member 13, that is, on the outer surface of the second section 112; specifically, the second section 112 is evenly and circumferentially provided with a plurality of glue dispensing grooves 1121, and the glue dispensing grooves 1121 extend along the length direction of the second section 112. The glue dispensing grooves 1121 are mainly used for pasting the second shell 12, and glue is dispensed in the glue dispensing grooves 1121, for example, glue or other adhesives are placed in the glue dispensing grooves 1121. When the second shell 12 is sleeved on the outer periphery of the second section 112, the second shell 12 squeezes the glue in the glue dispensing grooves 1121, and the glue overflows to the outside of the glue dispensing grooves 1121, so that the larger the glue pasting area, the more stable the pasting between the second shell 12 and the second section 112, and at the same time, the gap between the second shell 12 and the second section 112 can be further sealed.

[0106] More specifically, the glue dispensing groove 1121 can also be opened at one end of the second section 112 located at the first sealing member 13. At this time, the glue dispensing groove 1121 is an annular groove opened in an annular direction on the outer surface of the second section 112. Placing glue or other adhesives in the glue dispensing groove 1121 here can enhance the connection sealing between the second shell 12 and the end of the second section 112, thereby greatly improving the sealing effect and preventing water seepage between the second shell 12 and the second section 112.

[0107] See again Figure 7 The top surface of the second shell 12 facing the first section 111 may not be perpendicular to the length direction of the second section 112 to form a first inclined surface 123. The top surface of the first section 111 facing the second shell 12 may not be perpendicular to the length direction of the second section 112 to form a second inclined surface 118. The first inclined surface 123 and the second inclined surface 118 abut against each other to limit the rotation of the second shell 12 around the length direction of the second section 112.

[0108] In actual application, when the second shell 12 is sleeved on the outer periphery of the second section 112, the fool-proof interface 122 on the second shell 12 is docked with the fool-proof protrusion 117 on the first shell 11, and the first inclined surface 123 and the second inclined surface 118 are abutted. This arrangement can prevent the second shell 12 from rotating relative to the first shell 11, further increasing the connection stability between the first shell 11 and the second shell 12.

[0109] It is understandable that the first inclined surface 123 and the second inclined surface 118 have the same inclination angle, so that the two inclined surfaces can completely abut. In addition, the first sealing member 13 is also inclined, and the inclination angle is the same as the inclination angle of the first inclined surface 123 and the second inclined surface 118, so that the abutment between the first sealing member 13 and the second housing 12 can be ensured to be more firmly.

[0110] In one embodiment, the top surface of the second shell 12 facing the first section 111 can be perpendicular to the length direction of the second section 112, and the top surface of the first section 111 facing the second shell 12 can be perpendicular to the length direction of the second section 112, and the top surface of the second shell 12 abuts against the top surface of the first section 111.

[0111] Different from the above-mentioned embodiment, the first inclined surface 123 and the second inclined surface 118 can also be vertical surfaces perpendicular to the length direction of the second section 112. In this way, when the top surface of the second shell 12 is abutted against the top surface of the first section 111, there is no need to align the inclination angle, which makes it easier to match each other and the gap between the two top surfaces can be smaller.

[0112] It is understandable that the first inclined surface 123 and the second inclined surface 118 are not limited to planes, but may also be curved surfaces or concave-convex surfaces, which is not limited in the present application.

[0113] In one embodiment, the first section 111 and the second section 112 can be connected by threads. With this arrangement, the first section 111 and the second section 112 can be disassembled to facilitate installation and replacement, and can be transported separately to reduce the size of the device.

[0114] In one embodiment, the first section 111 and the second section 112 can be connected by nano injection molding. In this way, the first section 111 can be partially plastic and partially metal, thereby enhancing the connection stability between the first section 111 and the second section 112. It should be noted that nano injection molding connection is a technology that combines metal materials and plastic materials together through an injection molding process.

[0115] In one embodiment, the first section 111 and the second section 112 may also be integrally formed; in this way, the first section 111 and the second section 112 may be manufactured and processed at the same time, and the integral forming may prevent water seepage at the connection between the two sections.

[0116] In one embodiment, the second section 112 and the second shell 12 can be connected by secondary injection molding or nano injection molding. In this way, the connection between the second shell 12 and the second section 112 is tighter, which greatly enhances the connection stability between the two, and can eliminate the installation step of the second shell 12, thereby improving the assembly efficiency of the device.

[0117] It is understandable that, in other embodiments, the first section 111 and the second section 112 may be connected in other ways, and the second section 112 and the second shell 12 may be connected in other ways, and the present application does not limit this.

[0118] See also Fig. 9 The toothbrush host 1 also includes a movement 14, which is installed in the first shell 11. A first connecting structure 141 is provided on the side of the movement 14 facing the first shell 11, and a second connecting structure 114 is provided on the side of at least one of the first section 111 and the second section 112 facing the movement 14; wherein, one of the first connecting structure 141 and the second connecting structure 114 is a slide groove, and the other of the first connecting structure 141 and the second connecting structure 114 is a slide rail, and the slide rail and the slide groove are slidably matched along the length direction of the second section 112.

[0119] In actual applications, the first connecting structure 141 can be a slide rail, and the second connecting structure 114 can be a slide groove. Both the slide groove and the slide rail extend along the length direction of the second section 112, and the slide rail and the slide groove are slidably connected to play a guiding and limiting role, which facilitates the installation of the movement 14 and the first shell 11, and limits the relative rotation of the movement 14 and the first shell 11, making the connection between the two more stable.

[0120] It is understandable that the first connection structure 141 may also be a slide groove. Of course, in this case, the second connection structure 114 may be a slide rail, which is not limited in the present application.

[0121] See also Fig.10 The slide rail is provided with a limit bag 142 toward the slide slot, and the limit bag 142 elastically abuts against the slide slot. Specifically, at least a portion of the slide rail may protrude toward the slide slot to form a limit bag 142, and the limit bag 142 is made of an elastic material, such as plastic or rubber. When the movement 14 is installed in the first housing 11, the limit bag 142 elastically abuts against the slide slot, which can increase the connection stability between the movement 14 and the first housing 11 on the one hand, and prevent the first housing 11 from squeezing the movement 14 when it collides with the outside on the other hand. The limit bag 142 plays the role of elastic buffer to prevent the movement 14 from being damaged by the collision.

[0122] It should be noted that the movement 14 can be a motor or other electrical components.

[0123] See also Fig.11An output hole 1111 is formed at one end of the first section 111 away from the second section 112. The output hole 1111 is used for the output shaft of the movement 14 to extend out. The second section 112 has a central axis, and the center of the output hole 1111 deviates from the central axis.

[0124] In actual application, the output shaft of the movement 14 needs to be connected to the brush head 2 to drive the brush head 2 to vibrate or rotate. Therefore, an output hole 1111 is provided at the end of the first section 111 away from the second section 112, that is, an output hole 1111 is provided at the end of the first section 111 close to the brush head 2, and the output shaft of the movement 14 extends out from the output hole 1111 to facilitate connection with the brush head 2; and the output hole 1111 is set away from the central axis of the second section 112, which can adapt to movements 14 of different sizes, so that the output shafts of movements 14 of different sizes can all extend from the output hole 1111, thereby improving the adaptability of the first shell 11 and increasing the practical functions of the toothbrush host 1.

[0125] See also Fig.12 The toothbrush host 1 further includes a bottom cover 16 , and an end of the second shell 12 away from the first section 111 is provided with a connecting portion 124 extending beyond the second section 112 , and the connecting portion 124 is connected to the bottom cover 16 to seal the end of the second shell 12 away from the first section 111 .

[0126] In order to facilitate the second shell 12 to be sleeved on the second section 112 and simplify the production steps of the second shell 12, the second shell 12 is usually made into a structure with both ends open, so that the position of the second shell 12 relative to the second section 112 can be observed, and the second shell 12 is conveniently sleeved on the outer periphery of the second section 112. Based on this, the toothbrush host 1 also includes a bottom cover 16, the first sealing member 13 is used to seal the second section 112 and the end of the second shell 12 close to the first section 111, and the bottom cover 16 is used to seal the second section 112 and the end of the second shell 12 away from the first section 111, so that the overall sealing and stability of the toothbrush host 1 can be improved.

[0127] See again Fig.12 The toothbrush host 1 further includes a second sealing member 15 , which is connected to the bottom cover 16 and elastically abuts against the inner side of the connecting portion 124 . The second sealing member 15 is used to seal the connection between the bottom cover 16 and the connecting portion 124 .

[0128] The second seal 15 can be made of soft rubber. By providing the second seal 15 , the sealing effect between the bottom cover 16 and the connecting portion 124 is further strengthened to prevent water from penetrating from the bottom cover 16 into the interior of the second section 112 and contaminating the internal movement 14 .

[0129] In one embodiment, the wall thickness of the second shell 12 can be set to L1mm, where 0.5<L1<1.5. Specifically, the thickness of the outer metal of the second shell 12 can be set between 0.5mm and 1.5mm. If the thickness of the outer metal of the second shell 12 is less than 0.5mm, the strength of the second shell 12 is insufficient and it is easy to deform. If the thickness of the outer metal of the second shell 12 is greater than 1.5mm, the metal specific gravity is too large, which increases the weight of the toothbrush host 1 and makes it tiring for the user to hold it. Therefore, the thickness of the second shell 12 is set between 0.5mm and 1.5mm. For example, the thickness of the outer metal of the second shell 12 can be 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm and other values, which can meet the structural strength and does not increase the burden on the user to hold it.

[0130] See also Fig.14 In one embodiment, along the length direction of the second section 112, the length of the first section 111 is set to L2 mm, and the length of the second shell 12 is set to L3 mm, wherein 1 / 3<L2 / L3<3 / 2.

[0131] In actual applications, the first section 111 is provided with a display component 18 for displaying information; and the second shell 12 is used for holding. In order to make the ratio of display and holding more appropriate, the ratio of the length of the first section 111 to the length of the second shell 12 can be set between 1:3 and 3:2, for example, L2 / L3 can be 1.5 / 3, 2 / 3 or other values; specifically, L2 can be as small as one-third of L3, at this time, the length of the second shell 12 is longer, which is adapted to the hand size of different users and improves practicality; L2 can be as large as two-thirds of L3, at this time, the length of the first section 111 is longer, which can increase the display area of ​​the display component 18 and make the displayed information clearer and more detailed.

[0132] More specifically, in one embodiment, -0.1mm<L2-L3<0.1mm, for example L2-L3=0.05mm, that is, the length of the first section 111 is substantially the same as the length of the second shell 12, and the design of the electric toothbrush 10 along the length direction X is more balanced, with the display and holding being in a 1:1 ratio, thereby increasing the aesthetics of the electric toothbrush 10.

[0133] In one embodiment, the wall thickness of the second section 112 is set to L4mm, where 1<L4<2.5. Specifically, when L4 is less than 1mm, the thickness of the second section 112 is too thin. When it is connected to the first section 111 or the second shell 12, the connection is easy to break or crack, and it is not easy to form; and when the second section 112 is greater than 2.5mm, the thickness of the second section 112 is too thick, which affects the internal installation space and increases the overall weight, affecting the comfort of the user's holding. Therefore, L4 is set between 1mm and 2.5mm. For example, L4 can be 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm and other values. In this way, the thickness of the second section 112 is more appropriate, not too thin or too thick, easy to form and have sufficient support performance.

[0134] It can be understood that the values ​​of L1, L2, L3 and L4 can be set according to actual needs. When the size of the electric toothbrush 10 is different, the values ​​of L1, L2, L3 and L4 may also change accordingly. This application does not limit their values.

[0135] See also Fig.13 The toothbrush host 1 further includes a communication component 17 , which is located in the first section 111 and connected to the inner side surface of the first section 111 , and is opposite to the functional hole 113 .

[0136] It should be noted that some electric toothbrushes 10 can be connected to smart devices, such as smart phones or tablet computers, and the electric toothbrush 10 can synchronize brushing data to the smart device to facilitate users to track or analyze their brushing habits, or provide intelligent guidance through applications.

[0137] Based on this, the toothbrush host 1 can also include a communication component 17, which can be used to electrically connect to an external smart device and exchange data. The communication component 17 is connected to the inner side of the first section 111. Since the first section 111 is made of plastic, it has almost no shielding effect on the wireless signal. Therefore, the communication component 17 is arranged in the first section 111. This can prevent the wireless signal of the communication component 17 from being electromagnetically shielded, thereby improving the signal transmission efficiency of the communication component 17.

[0138] It is understandable that the communication component 17 may use wireless communication technology, such as NFC (Near Field Communication).

[0139] See also Fig.15 A material reduction groove 119 is provided on the inner side of the first section 111 , and the communication component 17 is assembled in the material reduction groove 119 . The wall thickness of the first section 111 located in the material reduction groove 119 is less than the wall thickness of the rest of the first section 111 .

[0140] Specifically, the material reduction groove 119 and the functional hole 113 are respectively opened on the opposite sides of the first section 111. At the same time, the position of the material reduction groove 119 is higher than the position of the button part 19, that is, the position of the material reduction groove 119 is closer to the brush head 2. This can further prevent the signal of the communication component 17 from being electromagnetically shielded, and facilitate the electrical connection between the communication component 17 and the movement 14.

[0141] Different from the prior art, the embodiment of the present application provides an electric toothbrush 10 and a toothbrush host 1 thereof, wherein the toothbrush host 1 includes a first shell 11 and a second shell 12, wherein the first shell 11 is connected to the brush head 2, and the second shell 12 is used for holding; specifically, the first shell 11 includes a first section 111 and a second section 112 along its length direction X, wherein the first section 111 is connected to the second section 112, or the first section 111 and the second section 112 are integrally formed; the second shell 12 is sleeved on the outer peripheral surface of the second section 112 along the length direction of the second section 112; wherein at least part of the first shell 11 is made of plastic, and the outer surface of at least part of the length of the second shell 12 is made of metal, and the second shell 12 is in sealing contact with at least part of the second section 112. Compared with the prior art, the toothbrush host 1 of the present application includes a first shell 11 and a second shell 12. The first shell 11 is at least partially made of plastic material, which is easy to stretch and deform, reducing the difficulty of production and processing, and plays a role in isolating the magnetic field, preventing the metal on the surface of the second shell 12 from shielding the signals of the internal electrical components, making the arrangement of the internal electrical components more flexible; the outer surface of the second shell 12 is metal, which improves the comfort of the user holding it. The electric toothbrush 10 using the above toothbrush host 1 greatly reduces the difficulty of manufacturing, improves production efficiency, and improves the comfort of the user.

[0142] The above is only a specific implementation of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.

Claims

1. A toothbrush host, characterized in that: include: The first shell includes a first section and a second section along its length direction, wherein the first section is connected to the second section, or the first section and the second section are integrally formed; as well as, A second shell, wherein the second shell is sleeved on the outer surface of the second section, and the first section is exposed; wherein at least part of the first shell is made of plastic, and the outer surface of at least part of the length of the second shell is made of metal, and the second shell is in at least part of sealed contact with the second section.

2. The toothbrush host according to claim 1, characterized in that: A step portion is provided at one end of the first section close to the second section, and the second shell is sleeved on the outer surface of the second section and abuts against the step portion.

3. The toothbrush host according to claim 2, characterized in that: Along the radial direction of the first shell, the outer surface of the step portion is higher than the outer surface of the second shell.

4. The toothbrush host according to claim 3, characterized in that: Along the radial direction of the first shell, a height difference between an outer surface of the step portion and an outer surface of the second shell is Z mm, 0≤Z<0.

2.

5. The toothbrush host according to claim 1, characterized in that: The wall thickness of the first section is greater than the wall thickness of the second shell.

6. The toothbrush host according to claim 1, characterized in that: The first section is provided with an output hole, and the output hole is used to connect the brush head; along the radial direction of the first shell, the outer surface of the first section is higher than the outer surface of the second shell.

7. The toothbrush host according to claim 6, characterized in that: The first section is made of plastic, and the second shell is made of metal.

8. The toothbrush host according to claim 1, characterized in that: The first section is provided with an output hole, the material of the end of the first section close to the output hole is metal, the material of the end of the first section away from the output hole is plastic, and the material of the second section is plastic; The material of the second shell is metal, or the material of one end of the second shell close to the first section is metal, and the material of one end of the second shell away from the first section is plastic.

9. The toothbrush host according to claim 1, characterized in that: The second shell adopts an integrally formed structure, and the length of the second shell is between 45 mm and 100 mm.

10. The toothbrush host according to claim 1, characterized in that: A positioning groove is provided on the side of the second section facing the second shell, and a positioning portion is provided on the side of the second shell facing the second section; or a positioning portion is provided on the side of the second section facing the second shell, and a positioning groove is provided on the side of the second shell facing the second section; the positioning portion is used to be plugged into the positioning groove to limit the rotation of the second shell around the length direction of the second section.

11. The toothbrush host according to claim 1, characterized in that: Along the circumferential direction of the second section, a plurality of limit strips are provided at intervals on the side of the second section facing the second shell, the limit strips extend along the length direction of the second section, and the plurality of limit strips abut against the inner side surface of the second shell; or, along the circumferential direction of the second section, a plurality of limit strips are provided at intervals on the side of the second shell facing the second section, the limit strips extend along the length direction of the second section, and the plurality of limit strips abut against the outer side surface of the second section, so that the second shell and the second section are interference connected.

12. The toothbrush host according to claim 1, characterized in that: One of the first shell and the second shell is provided with an anti-foolproof protrusion, and the other of the first shell and the second shell is provided with an anti-foolproof interface, and the anti-foolproof protrusion is inserted into the anti-foolproof interface along the length direction of the second section.

13. The toothbrush host according to claim 1, characterized in that: The toothbrush main unit comprises a first seal, which is arranged at the end of the second section, and the inner side surface of the second shell presses against the first seal to seal the gap between the second section and the second shell.

14. The toothbrush host according to claim 13, characterized in that: The first sealing member includes a sealing ring and a limiting convex strip. The sealing ring is sleeved on one end of the second section close to the first section. The limiting convex strip is connected to the outer circumference of the sealing ring and abuts against the second shell.

15. The toothbrush host according to claim 13, characterized in that: The second section is provided with a glue dispensing groove on at least one side of the first sealing member, the glue dispensing groove is used to contain an adhesive, and the adhesive is used to bond and seal the second shell and the second section.

16. The toothbrush host according to claim 1, characterized in that: The top surface of the second shell facing the first section is not perpendicular to the length direction of the second section to form a first inclined surface, the top surface of the first section facing the second shell is not perpendicular to the length direction of the second section to form a second inclined surface, the first inclined surface and the second inclined surface abut against each other to limit the rotation of the second shell around the length direction of the second section; or, the top surface of the second shell facing the first section is perpendicular to the length direction of the second section, the top surface of the first section facing the second shell is perpendicular to the length direction of the second section, and the top surface of the second shell abuts against the top surface of the first section.

17. The toothbrush host according to claim 16, characterized in that: The first section and the second section are connected by threading or nano injection molding; and / or, The second section and the second shell are connected by secondary injection molding or nano injection molding.

18. The toothbrush host according to claim 1, characterized in that: An output hole is formed at one end of the first section away from the second section, and the output hole is used for the output shaft of the movement to extend out. The second section has a central axis, and the center of the output hole deviates from the central axis.

19. The toothbrush host according to claim 1, characterized in that: The toothbrush main body comprises a bottom cover, and an end of the second shell away from the first section is provided with a connecting portion extending beyond the second section, and the connecting portion is connected to the bottom cover to seal the end of the second shell away from the first section.

20. The toothbrush host according to claim 19, characterized in that: The toothbrush main unit comprises a second sealing member, which is connected to the bottom cover and elastically abuts against the inner side surface of the connecting portion, and is used to seal the connection between the bottom cover and the connecting portion.

21. The toothbrush host according to claim 1, characterized in that: The wall thickness of the second shell is set to L1 mm, wherein 0.5<L1<1.

5.

22. The toothbrush host according to claim 1, characterized in that: Along the length direction of the second section, the length of the first section is set to L2 mm, and the length of the second shell is set to L3 mm, wherein 1 / 3<L2 / L3<3 / 2.

23. The toothbrush host according to claim 22, characterized in that: The wall thickness of the second section is set to L4 mm, where 1<L4<2.

5.

24. The toothbrush host according to claim 23, characterized in that: -0.1mm<L2-L3<0.1mm.

25. The toothbrush host according to claim 1, characterized in that: The toothbrush host comprises a movement, the movement is installed in the first shell, a first connection structure is provided on a side of the movement facing the first shell, and a second connection structure is provided on a side of at least one of the first section and the second section facing the movement; Among them, one of the first connection structure and the second connection structure is a slide groove, and the other of the first connection structure and the second connection structure is a slide rail, and the slide rail and the slide groove are slidably matched along the length direction of the second section.

26. The toothbrush host according to claim 25, characterized in that: The slide rail is provided with a limit bag toward the slide slot, and the limit bag elastically abuts against the slide slot.

27. The toothbrush host according to claim 1, characterized in that: The toothbrush host comprises a communication component, and the communication component is located in the first section and connected to the inner side surface of the first section.

28. The toothbrush host according to claim 27, characterized in that: The inner side surface of the first section is provided with a material reduction groove, the communication component is assembled in the material reduction groove, and the wall thickness of the first section located in the material reduction groove is smaller than the wall thickness of the remaining part of the first section.

29. The toothbrush host according to claim 1, characterized in that: The first section is provided with a functional hole, and the functional hole is used to install at least one of a button part and a display component.

30. The toothbrush host according to claim 29, characterized in that: The toothbrush host comprises a display component, which comprises a display element and a display shell. The display element is arranged on the inner side of the first section, and the display shell is installed on the functional hole. The display element and the display shell are arranged opposite to each other.

31. An electric toothbrush, characterized in that: It comprises a brush head and a toothbrush host according to any one of claims 1 to 30, wherein the toothbrush host is connected to the brush head.

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