Water tank and oral irrigator having the same

Abstract

The water tank (20) for oral irrigator has a main body (21) and a bottom cover (22) connected to the lower end of the main body (21) in a detachable manner. The oral irrigator can be switched among a first state, a second state and a third state. When the oral irrigator is in the first state, the bottom cover is connected to the main body in a manner that water cannot leak out of the water tank through the bottom cover. When the oral irrigator is in the second state, a drainage and ventilation path is formed between the bottom cover and the main body for air to flow between the inside and outside of the water tank to remove water. When the oral irrigator is in the third state, the bottom cover is not connected to the main body.

Description

Technical Field

[0001] This disclosure relates to the field of dental cleaning technology, and more particularly to a water tank and a dental flosser having the water tank. Background Technology

[0002] A water flosser is an auxiliary tool for cleaning the oral cavity. It uses the force of water jets to clean teeth and between teeth. A water flosser generally consists of a main body formed by integrating a circuit board and a water pump assembly into a housing, a nozzle connected to the main body that sprays water for cleaning the oral cavity, and a water tank that is detachably connected to the main body and stores water for cleaning the oral cavity.

[0003] In existing water flossers, some have a water inlet on the side wall of the tank. After use, residual water can be drained using the nozzle or poured out through the inlet. However, this doesn't completely remove the water, and some droplets usually remain inside. Since the tank is sealed for extended periods, these droplets can cause unpleasant odors and, over time, lead to the accumulation of scale and bacteria. To quickly remove these droplets and achieve drying, a bottom cover is known to be installed at the bottom of the tank. After use, the bottom cover is completely removed, allowing the device to lie horizontally and expose the entire tank interior. However, this horizontal placement can lead to instability and the device falling, contamination of the tank interior, and also requires more storage space and affects the aesthetics of the washing area. Therefore, there is room for improvement in the drainage and ventilation structure of existing water flosser tanks. Utility Model Content

[0004] This disclosure was made in consideration of the above circumstances, and its purpose is to provide a water tank that can facilitate the drainage of accumulated water from the bottom of the tank when placed vertically, accelerate the evaporation rate of residual water droplets in the tank, thereby achieving effective drainage and ventilation, as well as a water flosser equipped with the water tank.

[0005] The water tank disclosed herein is used for a water flosser. The water tank includes: a main body; and a bottom cover, which is detachably connected to the lower end of the main body. The water flosser can switch between a first state, a second state, and a third state. When the water flosser is in the first state, the bottom cover is connected to the main body in a manner that prevents water from leaking out of the water tank through the bottom cover. When the water flosser is in the second state, a drainage and ventilation path is formed between the bottom cover and the main body to allow air to circulate inside and outside the water tank and to drain water. When the water flosser is in the third state, the bottom cover is not connected to the main body.

[0006] According to one embodiment of the present disclosure, a water tank has ventilation holes at the bottom edge of the bottom cover.

[0007] According to one embodiment of the water tank disclosed herein, the main body is formed as a cylinder with openings at both the top and bottom. A protrusion protruding towards the main body and capable of sealing the lower opening of the main body is formed at the center of the bottom of the bottom cover. A main body side connecting portion with external threads is formed on the lower side of the main body. A bottom cover side connecting portion with internal threads is formed on the side wall of the bottom cover. When the water flosser is in the first state, the internal threads and external threads are fully engaged, and the protrusion of the bottom cover liquid-tightly seals the lower opening of the main body. When the water flosser is in the second state, the internal threads and external threads are partially engaged, and the protrusion of the bottom cover separates from the lower opening of the main body to form a gap. This gap, together with the vent hole, constitutes part of the drainage and ventilation path. When the water flosser is in the third state, the internal threads and external threads are not engaged, so the bottom cover is not connected to the main body.

[0008] According to one embodiment of the water tank of this disclosure, when the water flosser is in the first state, the protrusion contacts the lower opening of the main body in such a way that its top surface liquid-tightly seals the lower opening of the main body via an elastic waterproof layer; or, when the water flosser is in the first state, the protrusion contacts the lower opening of the main body in such a way that its side surface liquid-tightly seals the lower opening of the main body via an elastic waterproof ring.

[0009] According to one embodiment of the water tank disclosed herein, the main body is formed as a cylindrical shape with an open upper end and a bottom. The bottom of the main body is formed as a hollow portion that bulges upward. Ventilation holes are provided circumferentially on the side wall of the hollow portion. A locking protrusion is provided on the side wall of the hollow portion above the ventilation holes. The bottom cover is formed as a column that can be embedded in the hollow portion. A guide groove is provided on the side wall of the bottom cover for guiding the locking protrusion.

[0010] According to one embodiment of the water tank disclosed herein, the guide groove includes a guide groove opening into which the engaging protrusion slides, a first engaging portion for the engaging protrusion to engage and achieve positioning, and a second engaging portion located above the first engaging portion for the engaging protrusion to engage and achieve positioning. When the water flosser is in the first state, the bottom cover is fully embedded in the hollow portion, the engaging protrusion engages with the first engaging portion, and the bottom cover liquid-tightly seals the ventilation hole of the hollow portion. When the water flosser is in the second state, the bottom cover is partially embedded in the hollow portion, the engaging protrusion engages with the second engaging portion, and the ventilation hole of the hollow portion communicates with the guide groove of the bottom cover to jointly form part of the drainage and ventilation path. When the water flosser is in the third state, the bottom cover is not embedded in the hollow portion, thereby the bottom cover is not connected to the main body.

[0011] According to one embodiment of the present disclosure, the first engaging portion and the second engaging portion are located on the same side or on both sides of the guide groove opening relative to the guide groove opening.

[0012] According to one embodiment of the present disclosure, the main body is formed with openings at both the top and bottom ends. The main body includes an annular flat bottom portion and a cylindrical portion extending downward from the inner edge of the flat bottom portion. An elastic portion capable of elastic deformation along the radial direction of the bottom cover portion is formed in the bottom cover portion. The elastic portion can abut against the inner circumferential surface of the cylindrical portion. The main body and the bottom cover portion can switch between a first state, a second state, and a third state by changing the abutment state between the cylindrical portion and the elastic portion.

[0013] According to one embodiment of the water tank disclosed herein, the inner circumferential surface of the cylindrical portion includes a lower circumferential surface formed by gradually expanding downwards, an upper circumferential surface formed by gradually expanding upwards, and a boundary portion located between the lower circumferential surface and the upper circumferential surface. The elastic portion includes a plurality of elastic walls erected from the bottom of the bottom cover portion upwards, and each elastic wall has a flange portion formed at its top end. The plurality of elastic walls are arranged along the same circumference and formed at a position closer to the center of the bottom of the bottom cover portion than the vent hole, and form a predetermined gap between them. When the water flosser is in the first state, the flange of the elastic wall abuts against the circumferential surface of the cylindrical part, and the bottom of the bottom cover liquid-tightly seals the lower opening of the cylindrical part. When the water flosser is in the second state, the flange of the elastic wall abuts against the lower circumferential surface of the cylindrical part, and the gap between the elastic walls communicates with the ventilation hole of the bottom cover to jointly form part of the drainage and ventilation path. When the water flosser is in the third state, the flange of the elastic wall does not abut against the cylindrical part, so the bottom cover is not connected to the main body.

[0014] According to one embodiment of the water tank disclosed herein, the main body is formed with openings at both the top and bottom ends. The main body includes: an annular narrowed portion; and a cylindrical portion extending downward from the inner edge of the narrowed portion. A hollow portion is formed in the bottom cover, which bulges upward from the bottom of the bottom cover. A ventilation hole is provided on the side wall of the hollow portion, and the hollow portion can be embedded in the cylindrical portion. An elastic portion is disposed at the bottom of the bottom cover at a position not opposite to the ventilation hole of the hollow portion, and can abut against the outer peripheral surface of the cylindrical portion in a radially elastically deformable manner. The main body and the bottom cover can switch between a first state, a second state, and a third state by changing the contact state between the cylindrical portion and the elastic portion and the hollow portion.

[0015] According to one embodiment of the water tank disclosed herein, the elastic portion includes a plurality of elastic walls erected from the bottom of the bottom cover portion upwards, and each elastic wall has a flange portion formed at its top. The plurality of elastic walls are arranged along the same circumference and form a predetermined gap between them. The outer circumferential surface of the cylindrical portion has a first positioning portion for positioning by abutting the flange portion, and a second positioning portion for positioning by abutting the flange portion and located below the first positioning portion. When the water flosser is in the first state, the hollow portion is embedded in the cylindrical portion, and the flange portion of the elastic wall and the... The first positioning part of the cylinder abuts against the elastic wall and the hollow part to liquid-tightly seal the lower opening of the cylinder. When the water flosser is in the second state, the hollow part is not embedded in the cylinder, the flange of the elastic wall abuts against the second positioning part of the cylinder, and the gap between the elastic walls communicates with the ventilation hole of the hollow part to jointly form part of the drainage and ventilation path. When the water flosser is in the third state, the hollow part is not embedded in the cylinder, the flange of the elastic wall does not abut against the cylinder, and thus the bottom cover is not connected to the main body.

[0016] The oral irrigator disclosed herein includes a body and the aforementioned water tank, wherein the upper end of the main body portion of the water tank is detachably connected to the body.

[0017] Utility Model Effect

[0018] According to the water tank disclosed herein and the water flosser equipped with the water tank, water can be easily drained from the bottom of the water tank when placed vertically, and the evaporation rate of residual water droplets in the water tank can be accelerated, thereby achieving effective drainage and ventilation. Attached Figure Description

[0019] Figure 1 This is a front view of a water flosser including a water tank according to the first embodiment of this disclosure;

[0020] Figure 2 This is a longitudinal sectional view of a water tank comprising the first embodiment of the present disclosure for a water flosser;

[0021] Figure 3 This is a longitudinal sectional view of a water tank comprising the first embodiment of the present disclosure for a water flosser;

[0022] Figure 4 This is a perspective view of a water flosser including the water tank of the first embodiment of this disclosure;

[0023] Figure 5A This is a top view of the bottom cover of the water tank according to the first embodiment of this disclosure;

[0024] Figure 5B This is a longitudinal sectional view of the bottom cover of the water tank according to the first embodiment of this disclosure;

[0025] Figure 6A This is a partial longitudinal sectional view of the water tank according to the first embodiment of this disclosure;

[0026] Figure 6B This is a partial longitudinal sectional view of the water tank according to the first embodiment of this disclosure;

[0027] Figure 7A This is a partial longitudinal sectional view of the water tank according to the first embodiment of this disclosure;

[0028] Figure 7B This is a partial longitudinal sectional view of the water tank according to the first embodiment of this disclosure;

[0029] Figure 8 This is a longitudinal sectional view of a water tank irrigator including the second embodiment of the present disclosure;

[0030] Figure 9 This is a longitudinal sectional view of a water tank irrigator including the second embodiment of the present disclosure;

[0031] Figure 10 This is a perspective view of a water flosser including the water tank of the second embodiment of this disclosure;

[0032] Figure 11 This is a partial perspective view of the water tank according to the second embodiment of this disclosure;

[0033] Figure 12A This is a partial perspective view of the main body of the water tank according to the second embodiment of this disclosure;

[0034] Figure 12B This is a perspective view of the bottom cover of the water tank according to the second embodiment of this disclosure;

[0035] Figure 13AThis is a partial longitudinal sectional view of the water tank according to the second embodiment of this disclosure;

[0036] Figure 13B This is a partial longitudinal sectional view of the water tank according to the second embodiment of this disclosure;

[0037] Figure 14 This is a longitudinal sectional view of the water tank according to the third embodiment of this disclosure;

[0038] Figure 15 This is a longitudinal sectional view of the water tank according to the third embodiment of this disclosure;

[0039] Figure 16 This is a perspective view of the water tank according to the third embodiment of this disclosure;

[0040] Figure 17 This is a partial sectional perspective view of the water tank according to the third embodiment of this disclosure;

[0041] Figure 18 This is a longitudinal sectional view of the water tank according to the third embodiment of this disclosure;

[0042] Figure 19 This is a partial longitudinal sectional view of the water tank according to the fourth embodiment of this disclosure;

[0043] Figure 20 This is a partial longitudinal sectional view of the water tank according to the fourth embodiment of this disclosure;

[0044] Figure 21 This is a partial cross-sectional perspective view of the water tank according to the fourth embodiment of this disclosure;

[0045] Figure 22 This is a partial longitudinal sectional view of the water tank according to the fourth embodiment of this disclosure.

[0046] Explanation of reference numerals in the attached figures

[0047] 1.1A Water Flosser;

[0048] 10 body;

[0049] 20 water tanks;

[0050] 21, 21A, 21B, 21C Main body sections;

[0051] 22, 22A, 22B, 22C Bottom cover;

[0052] Ventilation holes 221, 211A, 221B, and 223C. Detailed Implementation

[0053] The embodiments of this disclosure will now be described with reference to the accompanying drawings. However, it should be understood that these descriptions are exemplary only and are not intended to limit the scope of this disclosure. In the following detailed description, numerous specific details are set forth to provide a comprehensive understanding of the embodiments of this disclosure for ease of explanation. However, it will be apparent that one or more embodiments may be implemented without these specific details. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concepts of this disclosure.

[0054] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit this disclosure. The terms “comprising”, “features”, etc., as used herein indicate the presence of the described features, operations, and / or components, but do not exclude the presence or addition of one or more other features, operations, or components.

[0055] All terms used herein (including technical and scientific terms) have the meanings commonly understood by those skilled in the art, unless otherwise defined. It should be noted that the terms used herein are to be interpreted in a manner consistent with the context of this specification, and not in an idealized or overly rigid way.

[0056] When using expressions such as "at least one of A, B, and C," they should generally be interpreted in accordance with the meaning commonly understood by a person skilled in the art (e.g., "an apparatus having at least one of A, B, and C" should include, but is not limited to, having A alone, having B alone, having C alone, having A and B, having A and C, having B and C, and / or having A, B, and C, etc.). A person skilled in the art should also understand that any conjunction and / or phrase that substantially arbitrarily represents two or more alternative items, whether in the specification, claims, or drawings, should be understood to give the possibility of including one of these items, either of these items, or both items. For example, the phrase "A or B" should be understood to include the possibility of "A" or "B," or "A and B."

[0057] Furthermore, in the following description, the same reference numerals are used for the same components or structures, and repeated descriptions are omitted. Also, for ease of understanding, the scale and aspect ratios of the actual objects may be appropriately altered or exaggerated in the accompanying drawings.

[0058] For ease of explanation, this disclosure uses terms such as "upper end," "lower end," "upper side," "lower side," "above," and "below" to indicate the orientation of the water flosser in its vertical position. When the water flosser is not in its vertical position, the above terms can be equivalently replaced by terms such as "one end," "the other end," "one side," "the other side," "one side," and "the other side."

[0059] In particular, the nozzle connected to the body and spraying water for cleaning the mouth in this disclosure can use a nozzle of a known structure, so its description is omitted and the corresponding illustration is omitted in the accompanying drawings.

[0060] This disclosure provides a water tank and a water flosser equipped with the water tank. The water flosser has a body and a water tank detachably connected to the body. The water tank has a main body portion and a bottom cover portion. The upper end of the main body portion is detachably connected to the main body. The bottom cover portion is detachably connected to the lower end of the main body portion. The water flosser can switch between a first state, a second state, and a third state. When the water flosser is in the first state, the bottom cover portion is connected to the main body portion in a manner that prevents water from leaking out of the water tank through the bottom cover portion. When the water flosser is in the second state, a drainage ventilation path is formed between the bottom cover portion and the main body portion to allow air to circulate inside and outside the water tank and to drain water. When the water flosser is in the third state, the bottom cover portion is not connected to the main body portion.

[0061] [First Implementation Method]

[0062] The following is for reference Figures 1 to 7B The oral irrigator 1 and the water tank 20, which include the water tank 20 of the first embodiment of the present disclosure, will be described.

[0063] Figure 1 This is a front view of the oral irrigator 1 according to the first embodiment of this disclosure. Figure 2 and Figure 3 This is a longitudinal sectional view of the water flosser 1. Figure 4 This is a 3D view of the water flosser 1.

[0064] like Figures 1 to 4 As shown, the oral irrigator 1 includes a body 10 and a water tank 20 detachably connected to the body 10. The water tank 20 includes a main body 21 and a bottom cover 22. The upper end of the main body 21 is detachably connected to the body 10. The bottom cover 22 is detachably connected to the lower end of the main body 21.

[0065] Depending on the connection state between the bottom cover 22 and the main body 21, the oral irrigator 1 can... Figure 1 and Figure 2 The first state shown Figure 3 The second state shown and Figure 4The device switches between the three states shown. In the first state, the bottom cover 22 is connected to the main body 21 in a manner that prevents water from leaking out of the water tank 20. This first state is the normal operating state for cleaning the mouth with the water flosser. In the second state, a drainage ventilation path is formed between the bottom cover 22 and the main body 21, allowing air to circulate inside and outside the water tank 20 and draining water. This second state is a drainage ventilation state that allows residual water droplets in the water tank to be quickly drained or evaporated after using the water flosser. In the third state, the bottom cover 22 is not connected to the main body 21. This third state is a deep cleaning state that allows for thorough cleaning of both the bottom cover 22 and the main body 21.

[0066] In this way, because the water flosser can switch between three states, it allows water to drain easily from the bottom of the tank when placed vertically, accelerating the evaporation of any remaining water droplets and achieving effective drainage and ventilation. In other words, after using the water flosser, there's no need to completely remove the tank cover; maintaining the water flosser's vertical position ensures effective drainage and ventilation. This solves the cleaning problem of water accumulation inside the tank, keeping the water flosser aesthetically pleasing and clean when stored.

[0067] Figure 5A This is a top view of the bottom cover 22. (See attached image.) Figure 4 and Figure 5A As shown, a ventilation hole 221 is provided at the bottom of the bottom cover portion 22. In this embodiment, a pair of ventilation holes 221 are provided at the bottom edge of the bottom of the bottom cover portion 22. However, the ventilation holes 221 are not limited to a pair, and there may be one or more than two. From the viewpoint of better realizing convection, the number of ventilation holes 221 is preferably two or more.

[0068] Figure 5B This is a longitudinal sectional view of the bottom cover 22. (See image.) Figures 2 to 5B As shown, the main body 21 of the water flosser 1 is formed as a cylindrical shape with openings at both the top and bottom. A protrusion 222 is formed at the center of the bottom of the bottom cover 22, protruding towards the main body 21 to seal the lower opening of the main body 21. A main body-side connecting portion 213 is formed on the lower side of the main body 21, and this main body-side connecting portion 213 has an external thread 213S. A bottom cover-side connecting portion 223 is formed on the side wall of the bottom cover 22, and this bottom cover-side connecting portion has an internal thread 223S. Figures 2 to 4As shown, the main body side connecting portion 213 and the bottom cover side connecting portion 223 can switch between a first state, a second state, and a third state by changing the engagement state between the external thread 213S and the internal thread 223S. That is, when the water flosser 1 is in the first state, the internal thread 223S and the external thread 213S are fully engaged, and the protrusion 222 of the bottom cover portion 22 liquid-tightly seals the lower end opening of the main body portion 21. When the water flosser is in the second state, the internal thread 223S and the external thread 213S are partially engaged, and the protrusion 222 of the bottom cover portion 22 separates from the lower end opening of the main body portion 21 to form a gap, which, together with the vent hole 221, constitutes part of the drainage and ventilation path. When the water flosser 1 is in the third state, the internal thread 223S and the external thread 213S are not engaged, so the bottom cover portion 22 is not connected to the main body portion 21.

[0069] Furthermore, the engagement of the internal thread 223S and the external thread 213S is achieved by rotating the bottom cover 22 relative to the main body 21. That is, in the first state where the internal thread 223S and the external thread 213S are fully engaged, rotating the bottom cover 22 in the loosening direction achieves the second state when it is not fully unscrewed, and the third state when it is fully unscrewed. Conversely, in the third state where the internal thread 223S and the external thread 213S are completely separated, rotating the bottom cover 22 in the tightening direction achieves the second state when it is not fully engaged, and the first state when it is fully engaged.

[0070] Figures 6A to 6B This is a partial longitudinal sectional view showing water tank 20. Figure 6A The connection method between the main body 21 and the bottom cover 22 in the first state is shown in detail. Figure 6B The airflow method based on this connection method is shown in detail in the second state.

[0071] like Figure 6A As shown, when the water flosser 1 is in the first state, the external thread of the main body side connector is fully engaged with the internal thread of the bottom cover side connector, and the protrusion 222 of the bottom cover 22 liquid-tightly seals the lower end opening 212 of the main body 21. To better achieve this seal, the top of the protrusion 222 is formed, for example, as an elastic waterproof layer L. Thus, the protrusion 222 contacts the lower end opening 212 of the main body 21 in such a way that the top surface liquid-tightly seals the lower end opening 212 of the main body 21 via the elastic waterproof layer L. The contact between the elastic waterproof layer L and the lower end opening 212 of the main body 21 is a seamless abutment, so that water cannot leak out to the outside of the water tank 20 through the contact point between the two. In addition, for aesthetics and comfort during use, it is preferable that when the water flosser 1 is in the first state, the outer surface of the bottom cover 22 is in smooth contact with the outer surface of the main body 21.

[0072] like Figure 6BAs shown, when the water flosser 1 is in the second state, the internal thread 223S and the external thread 213S are partially screwed together, and the protrusion 222 of the bottom cover 22 separates from the lower end opening of the main body 21 to form a gap G. Air enters the water tank 20 through the vent 221 and this gap G, causing air convection inside the water tank 20, and then flows out to the outside through the vent 221 through the gap G. In other words, a drainage and ventilation path is formed between the bottom cover 22 and the main body 21 to allow air to circulate inside and outside the water tank 20 and drain water. This gap G and the vent 221 together constitute part of the drainage and ventilation path, accelerating the discharge or evaporation of residual water droplets in the water tank. When there are multiple vents 221, the drainage and ventilation effect is better, facilitating the discharge of accumulated water from the bottom of the water tank and accelerating the evaporation of residual water droplets in the water tank.

[0073] Figures 7A to 7B This is a partial longitudinal sectional view showing water tank 20. Figure 7A Another connection method between the main body 21 and the bottom cover 22 in the first state is shown in detail. Figure 7B The airflow pattern based on this connection method in the second state is shown in detail. Besides the connection method between the main body 21 and the bottom cover 22, Figures 7A to 7B The water tank shown is Figures 6A to 6B The water tanks shown are largely the same in terms of specific structure and drainage and ventilation principles.

[0074] like Figure 7A As shown, when the oral irrigator 1 is in the first state, the external thread of the main body side connector is fully engaged with the internal thread of the bottom cover side connector, and the protrusion 222 of the bottom cover 22 liquid-tightly seals the lower opening of the main body 21. To better achieve this seal, an elastic waterproof ring O is provided, for example, on the outer periphery of the side of the protrusion 222. Thus, the protrusion 222 contacts the lower opening 212 of the main body 21 in such a way that the side of the protrusion 222 liquid-tightly seals the lower opening 212 of the main body 21 via the elastic waterproof ring O. The contact between the elastic waterproof ring O and the lower opening 212 of the main body 21 is a seamless abutment, so that water cannot leak out to the outside of the water tank 20 through the contact point between the two. In addition, for aesthetics and comfort during use, it is preferable that when the oral irrigator 1 is in the first state, the outer surface of the bottom cover 22 is smoothly in contact with the outer surface of the main body 21.

[0075] like Figure 7BAs shown, when the water flosser 1 is in the second state, the internal thread 223S and the external thread 213S are partially screwed together, and the protrusion 222 of the bottom cover 22 separates from the lower end opening of the main body 21 to form a gap G. Air enters the water tank 20 through the vent 221 and this gap G, causing air convection inside the water tank 20, and then flows out to the outside through the vent 221 through the gap G. In other words, a drainage and ventilation path is formed between the bottom cover 22 and the main body 21 to allow air to circulate inside and outside the water tank 20 and drain water. This gap G and the vent 221 together constitute part of the drainage and ventilation path, accelerating the discharge or evaporation of residual water droplets in the water tank. When there are multiple vents 221, the drainage and ventilation effect is better, facilitating the discharge of accumulated water from the bottom of the water tank and accelerating the evaporation of residual water droplets in the water tank.

[0076] [Second Implementation Method]

[0077] The following is for reference Figures 8 to 13B The oral irrigator 1A, which includes the water tank 20 of the second embodiment of the present disclosure, and the water tank 20 will be described.

[0078] Figure 8 and Figure 9 This is a longitudinal sectional view of the water flosser 1A. Figure 10 This is a 3D diagram of the water flosser 1A. (See diagram below.) Figures 8 to 10 As shown, the oral irrigator 1A includes a body 10 and a water tank 20 detachably connected to the body 10. The water tank 20 includes a main body portion 21A and a bottom cover portion 22A. The upper end of the main body portion 21A is connected to the body 10. The bottom cover portion 22A is detachably connected to the lower end of the main body portion 21A.

[0079] Depending on the connection state between the bottom cover 22A and the main body 21A, the oral irrigator 1A can... Figure 8 The first state shown Figure 9 The second state shown and Figure 10 The device switches between the shown three states. In the first state, the bottom cover 22A is connected to the main body 21A in a manner that prevents water from leaking out of the water tank 20. This first state is the normal operating state for cleaning the mouth with the water flosser. In the second state, a drainage ventilation path is formed between the bottom cover 22A and the main body 21A to allow air to circulate inside and outside the water tank 20 and drain water. This second state is a drainage ventilation state that allows residual water droplets in the water tank to be quickly drained or evaporated after using the water flosser. In the third state, the bottom cover 22A is not connected to the main body 21A. This third state is a deep cleaning state that allows for thorough cleaning of both the bottom cover 22A and the main body 21A.

[0080] Figure 11 This is a partial 3D view of the water tank 20 of the water flosser 1A. Figure 12A This is a partial perspective view of the main body 21A of the water tank 20. Figure 12B This is a three-dimensional view of the bottom cover 22A of water tank 20.

[0081] like Figures 11 to 12B As shown, the main body 21A is formed as a cylinder with an open top and a bottom. The bottom of the main body 21A is formed as a hollow portion 212A that bulges upward. Ventilation holes 211A are formed on the side wall of the hollow portion 212A. Multiple ventilation holes 211A are formed and are formed circumferentially on the side wall of the hollow portion 212A. Engaging protrusions 213A are provided on the side wall of the hollow portion 212A above the ventilation holes 211A. In this embodiment, a pair of engaging protrusions 213A are provided in a centrally symmetrical manner. The bottom cover 22A is formed as a column that can be inserted into the hollow portion 212A, and a guide groove 223A is provided on the side wall of the bottom cover 22A for guiding the engaging protrusions 213A. The shape and position of the guide groove 223A correspond to the engaging protrusions 213A.

[0082] More specifically, the guide groove 223A includes a guide groove opening 2230 into which the engagement protrusion 213A slides, a first engagement portion 2231 for positioning by engaging the engagement protrusion 213A, and a second engagement portion 2232 for positioning by engaging the engagement protrusion 213A and located above the first engagement portion 2231.

[0083] Reference Figures 11 to 12B And the previous ones Figures 8 to 10 It can be seen that the bottom cover 22A and the main body 21A can switch between a first state, a second state, and a third state by changing the engagement state between the engaging protrusion 213A and the engaging portion of the guide groove 223A. That is, when the oral irrigator 1A is in the first state, the bottom cover 22A is fully embedded in the hollow part 212A, the engaging protrusion 213A is engaged in the first engaging portion 2231, and the bottom cover 22A liquid-tightly seals the ventilation hole 211A of the hollow part 212A. When the oral irrigator 1A is in the second state, the bottom cover 22A is partially embedded in the hollow part 212A, the engaging protrusion 213A is engaged in the second engaging portion 2232, and the ventilation hole 211A of the hollow part 212A communicates with the guide groove 223A of the bottom cover 22A to jointly form part of the drainage and ventilation path. When the water flosser is in the third state, the bottom cover 22A is not embedded in the hollow part 212A, so the bottom cover 22A is not connected to the main body 21A.

[0084] Furthermore, the engagement between the engaging protrusion 213A and the engaging portion of the guide groove 223A is achieved by rotating the bottom cover portion 22A relative to the main body portion 21A. That is, in the first state where the engaging protrusion 213A is engaged with the first engaging portion 2231, rotating the bottom cover portion 22A in the direction of the guide groove opening 2230, after the engaging protrusion 213A leaves the first engaging portion 2231, slightly pulling down the bottom cover portion 22A, and then rotating the bottom cover portion 22A to engage the engaging protrusion 213A with the second engaging portion 2232 can achieve the second state. From the first state or the second state, rotating the engaging protrusion 213A out of the guide groove opening 2230 can achieve the third state. Conversely, in the third state where the engaging protrusion 213A and the guide groove 223A are completely separated, rotating the bottom cover 22A to engage the engaging protrusion 213A with the first engaging portion 2231 achieves the first state, and engaging the engaging protrusion 213A with the second engaging portion 2232 achieves the second state. To facilitate rotating the bottom cover 22A, a recess for receiving fingers is preferably provided on the outer side of the bottom cover 22A. Additionally, a locking structure can be provided to enhance the engagement stability between the engaging protrusion 213A and the guide groove 223A. This locking structure may be, for example, a recess or protrusion provided at the front end of the engaging protrusion 213A, and a protrusion or recess provided at the first engaging portion 2231 and / or the second engaging portion 2232, with a shape and position corresponding to the recess or protrusion at the front end of the engaging protrusion 213A.

[0085] In this embodiment, such as Figure 12B As shown, the first engaging portion 2231 and the second engaging portion 2232 are located on the same side of the guide groove opening 2230 relative to the guide groove opening 2230. However, this is not a limitation; if necessary, the first engaging portion 2231 and the second engaging portion 2232 may also be located on opposite sides of the guide groove opening 2230 relative to the guide groove opening 2230.

[0086] Figures 13A to 13B This is a partial longitudinal sectional view showing water tank 20. Figure 13A The connection method between the main body 21A and the bottom cover 22A in the first state is shown in detail. Figure 13B The airflow method based on this connection method is shown in detail in the second state.

[0087] like Figures 13A to 13BAs shown, when the water flosser 1A switches from the first state to the second state, the engaging protrusion switches from engaging with the lower first engaging part to engaging with the upper second engaging part. Air enters the water tank 20 from the guide groove 223A through the ventilation hole 211A, causing air convection within the water tank 20, and then flows out to the outside through the ventilation hole 211A and the guide groove 223A. In other words, a drainage and ventilation path is formed between the bottom cover 22A and the main body 21A, allowing air to circulate inside and outside the water tank 20 and drain water. This guide groove 223A and the ventilation hole 211A together constitute part of the drainage and ventilation path, accelerating the evaporation rate of residual water droplets in the water tank. Multiple ventilation holes 211A are formed, thus facilitating the drainage of accumulated water from the bottom of the water tank and improving the drainage and ventilation effect of accelerating the evaporation rate of residual water droplets in the water tank.

[0088] [Third Implementation Method]

[0089] The following is for reference Figures 14 to 18 The oral irrigator including the water tank 20 of the third embodiment of this disclosure and the water tank 20 will be described.

[0090] Figure 14 and Figure 15 This is a longitudinal sectional view of the water tank of the oral irrigator. Figure 16 This is a 3D view of the water tank of the oral irrigator. (For example...) Figures 14 to 16 As shown, the water tank 20 includes a main body 21B and a bottom cover 22B. The upper end of the main body 21B is connected to the main body 10. The bottom cover 22B is detachably connected to the lower end of the main body 21B.

[0091] Depending on the connection state between the bottom cover 22B and the main body 21B, the oral irrigator can... Figure 14 The first state shown Figure 15 The second state shown and Figure 16 The device switches between the shown three states. In the first state, the bottom cover 22B is connected to the main body 21B in a manner that prevents water from leaking out of the water tank 20. This first state is the normal operating state for cleaning the mouth with the water flosser. In the second state, a drainage ventilation path is formed between the bottom cover 22B and the main body 21B, allowing air to circulate inside and outside the water tank 20 and drain water. This second state is a drainage ventilation state that allows residual water droplets in the water tank to be quickly drained or evaporated after using the water flosser. In the third state, the bottom cover 22B is not connected to the main body 21B. This third state is a deep cleaning state that allows for thorough cleaning of both the bottom cover 22B and the main body 21B.

[0092] Figure 17 This is a partial sectional perspective view of water tank 20. (See attached image.) Figures 14 to 17As shown, the main body 21B is formed with openings at both the top and bottom. The main body 21B includes a flat bottom portion 211B and a cylindrical portion 212B. The flat bottom portion 211B is formed in an annular shape. The cylindrical portion 212B is preferably formed at the center of the bottom of the main body 21B and extends downward from the inner edge of the flat bottom portion 211B. An elastic portion 222B is formed in the bottom cover portion 22B, which is capable of elastic deformation along the radial direction of the bottom cover portion 22B, and the elastic portion 222B can abut against the inner circumferential surface of the cylindrical portion 212B.

[0093] More specifically, the inner circumferential surface of the cylindrical portion 212B includes a lower circumferential surface 2122 formed in a manner that gradually expands downward, an upper circumferential surface 2121 formed in a manner that gradually expands upward, and a boundary portion 2120 located between the lower circumferential surface 2122 and the upper circumferential surface 2121. The elastic portion 222B includes a plurality of elastic walls 22BW erected from the bottom of the bottom cover portion 22B upward, and a flange portion 22BF is formed at the top of each elastic wall 22BW. The plurality of elastic walls 22BW are arranged along the same circumference and formed at a position closer to the center of the bottom of the bottom cover portion 22B than the ventilation hole, and a predetermined gap 22BS is formed between them.

[0094] like Figures 14 to 17 As shown, the main body 21B and the bottom cover 22B can switch between a first state, a second state, and a third state by changing the contact state between the cylindrical part 212B and the elastic part 222B. That is, when the water flosser is in the first state, the flange 22BF of the elastic wall 22BW abuts against the circumferential surface 2121 of the cylindrical part 212B, and the bottom of the bottom cover 22B liquid-tightly seals the lower opening of the cylindrical part 212B. At this time, the flange 22BF of the elastic wall 22BW is compressed by the circumferential surface 2121 and is in a radially inward converging state, and the gap 22BS between the elastic walls 22BW becomes smaller. When the water flosser is in the second state, the force of the flange portion 22BF extending radially outward causes the flange portion 22BF of the elastic wall 22BW to stably abut against the lower circumferential surface 2122 of the cylindrical portion 212B. The gap 22BS between the elastic walls 22BW communicates with the ventilation hole 221B of the bottom cover portion 22B, together forming part of the drainage and ventilation path. When the water flosser is in the third state, the flange portion 22BF of the elastic wall 22BW does not abut against the cylindrical portion 212B, and thus the bottom cover portion 22B is not connected to the main body portion 21B.

[0095] Furthermore, the contact between the cylindrical portion 212B and the elastic portion 222B is achieved by inserting and pulling the bottom cover portion 22B relative to the main body portion 21B. That is, in the first state where the flange portion 22BF of the elastic wall 22BW is in contact with the upper circumferential surface 2121 of the cylindrical portion 212B, pulling the bottom cover portion 22B downward so that the flange portion 22BF crosses the dividing portion 2120 and contacts the lower circumferential surface 2122 can achieve the second state. In this second state, continuing to pull the bottom cover portion 22B downward so that the flange portion 22BF separates from the lower circumferential surface 2122 can achieve the third state. Conversely, in the third state where the cylindrical portion 212B and the elastic portion 222B are completely separated, inserting the elastic portion 222B upward into the cylindrical portion 212B so that the flange portion 22BF abuts against the lower circumferential surface 2122 achieves the second state. In this second state, inserting the elastic portion 222B further upward into the cylindrical portion 212B so that the flange portion 22BF crosses the dividing portion 2120 and abuts against the upper circumferential surface 2121 achieves the first state.

[0096] Figure 18 This is a longitudinal sectional view of the water tank 20, which shows in detail the airflow between the water tank 20 and the outside in the second state.

[0097] like Figure 18 As shown, when the water flosser is in the second state, the flange 22BF of the elastic wall 22BW abuts against the lower circumferential surface 2122 of the cylindrical part 212B. Air enters the water tank 20 through the vent 221B at the bottom of the bottom cover 22B via the gap 22BS between the elastic walls 22BW, causing air convection within the water tank 20, and then flows out through the vent 221B to the outside via the gap 22BS. In other words, a drainage and ventilation path is formed between the bottom cover 22B and the main body 21B, allowing air to circulate inside and outside the water tank 20 and drain water. This gap 22BS and the vent 221B together constitute part of the drainage and ventilation path, accelerating the evaporation rate of residual water droplets in the water tank. Multiple gaps 22BS are formed, thus improving the drainage and ventilation effect, facilitating the drainage of accumulated water from the bottom of the water tank and accelerating the evaporation rate of residual water droplets in the water tank.

[0098] [Fourth Implementation Method]

[0099] The following is for reference Figures 19 to 22 The oral irrigator including the water tank 20 of the fourth embodiment of this disclosure and the water tank 20 will be described.

[0100] Figure 19 and Figure 20 This is a partial longitudinal sectional view of water tank 20. Figure 21 This is a partial sectional perspective view of the water tank 20, mainly showing the three-dimensional structure of the main body 21C and the bottom cover 22C of the water tank 20.

[0101] Depending on the connection state between the bottom cover 22C and the main body 21C, the oral irrigator can... Figure 19 The first state shown Figure 20 The second state shown and Figure 21 The device switches between the shown three states. In the first state, the bottom cover 22C is connected to the main body 21C in a manner that prevents water from leaking out of the water tank 20. This first state is the normal operating state for cleaning the mouth with the water flosser. In the second state, a drainage ventilation path is formed between the bottom cover 22C and the main body 21C to allow air to circulate inside and outside the water tank 20 and drain water. This second state is a drainage ventilation state that allows residual water droplets in the water tank to be quickly drained or evaporated after using the water flosser. In the third state, the bottom cover 22C is not connected to the main body 21C. This third state is a deep cleaning state that allows for thorough cleaning of both the bottom cover 22C and the main body 21C.

[0102] like Figures 19 to 21 As shown, the main body 21C is shaped with openings at both the top and bottom. The main body 21C includes a narrowed diameter portion 211C and a cylindrical portion 212C. The narrowed diameter portion 211C is annular. The cylindrical portion 212C is preferably formed at the center of the bottom of the main body 21C, extending downwards from the inner edge of the narrowed diameter portion 211C. A hollow portion 221C and an elastic portion 222C are formed in the bottom cover portion 22C. The hollow portion 221C is formed by bulging upwards from the bottom of the bottom cover portion 22C, and a ventilation hole 223C is provided on its side wall. The hollow portion 221C can be inserted into the cylindrical portion 212C. The elastic portion 222C is located at the bottom of the bottom cover portion 22C at a position not opposite to the ventilation hole 223C of the hollow portion 221C, and can abut against the outer peripheral surface of the cylindrical portion 212C by elastically deforming along the radial direction of the bottom cover portion 22C. More specifically, the elastic portion 222C includes a plurality of elastic walls 22CW erected from the bottom of the bottom cover portion 22C upwards, and each elastic wall 22CW has a flange portion 22CF formed at its top. The plurality of elastic walls 22CW are arranged along the same circumference and have a predetermined gap between them. The outer peripheral surface of the cylindrical portion 212C has a first positioning portion 212C1 for positioning by abutting the flange portion 22CF, and a second positioning portion 212C2 for positioning by abutting the flange portion 22CF and located below the first positioning portion 212C1.

[0103] like Figures 19 to 21As shown, the main body 21C and the bottom cover 22C can switch between a first state, a second state, and a third state by changing the contact state between the cylindrical part 212C, the elastic part 222C, and the hollow part 221C. That is, when the oral irrigator is in the first state, the hollow part 221C is embedded in the cylindrical part 212C, the flange 22CF of the elastic wall 22CW abuts against the first positioning part 212C1 of the cylindrical part 212C, and the elastic wall 22CW and the hollow part 221C liquid-tightly seal the lower end opening of the cylindrical part 212C. At this time, the hollow part 221C abuts against the inner circumferential surface of the cylindrical part 212C, for example, with its side surface, and preferably, an elastic waterproof layer that can abut against the lower end of the cylindrical part 212C is provided between the inner side surface of the elastic wall 22CW and the outer side surface of the hollow part 221C. When the distance between the inner surface of the elastic wall 22CW and the outer surface of the hollow portion 221C is approximately equal to the thickness of the cylindrical portion 212C, the sealing effect is better. In the second state of the water flosser, the hollow portion 221C is not embedded in the cylindrical portion 212C, the flange portion 22CF of the elastic wall 22CW abuts against the second positioning portion 212C2 of the cylindrical portion 212C, and the gap between the elastic walls 22CW communicates with the ventilation hole 223C of the hollow portion 221C, together forming part of the drainage and ventilation path. In the third state of the water flosser, the hollow portion 221C is not embedded in the cylindrical portion 212C, the flange portion 22CF of the elastic wall 22CW does not abut against the cylindrical portion 212C, and thus the bottom cover portion 22C is not connected to the main body portion 21C.

[0104] Furthermore, the contact between the cylindrical portion 212C and the elastic portion 222C is achieved by inserting or pulling the bottom cover portion 22C relative to the main body portion 21C. That is, in the first state where the flange portion 22CF of the elastic wall 22CW abuts against the first positioning portion 212C1 of the cylindrical portion 212C, pulling the bottom cover portion 22C downwards to make the flange portion 22CF abut against the second positioning portion 212C2 of the cylindrical portion 212C achieves the second state. In this second state, continuing to pull the bottom cover portion 22C downwards to separate the flange portion 22CF from the cylindrical portion 212C achieves the third state. Conversely, in the third state where the cylindrical portion 212C and the elastic portion 222C are completely separated, inserting the elastic portion 222C upward into the cylindrical portion 212C so that the flange portion 22CF abuts against the second positioning portion 212C2 of the cylindrical portion 212C can achieve the second state. In this second state, inserting the elastic portion 222C further upward into the cylindrical portion 212C so that the flange portion 22CF abuts against the first positioning portion 212C1 of the cylindrical portion 212C can achieve the first state.

[0105] Figure 22 This is a partial longitudinal sectional view of the water tank 20, which shows in detail the air circulation between the water tank 20 and the outside in the second state.

[0106] like Figure 22As shown, when the water flosser is in the second state, the flange 22CF of the elastic wall 22CW abuts against the second positioning part 212C2 of the cylindrical part 212C. Air enters the water tank 20 through the vent 223C of the hollow part 221C via the gap between the elastic walls 22CW, causing air convection inside the water tank 20, and then flows out to the outside through the vent 223C via the gap between the elastic walls 22CW. In other words, a drainage and ventilation path is formed between the bottom cover 22C and the main body 21C to allow air to circulate inside and outside the water tank 20 and drain water. The gap between the elastic walls 22CW and the vent 223C of the hollow part 221C together constitute part of the drainage and ventilation path, accelerating the evaporation rate of residual water droplets inside the water tank.

[0107] As can be seen from the first to fourth embodiments of the present disclosure described above, the water tank and the oral irrigator equipped with the water tank of the present disclosure can facilitate the drainage of accumulated water from the bottom of the water tank when placed in a vertical position, and accelerate the evaporation rate of residual water droplets in the water tank, thereby achieving effective drainage and ventilation.

[0108] Those skilled in the art will understand that the features described in the various embodiments and / or technical solutions of this disclosure can be combined or combined in various ways, even if such combinations or combinations are not explicitly described in this disclosure. In particular, the features described in the various embodiments and / or technical solutions of this disclosure can be combined or combined in various ways without departing from the spirit and teachings of this disclosure. All such combinations and / or combinations fall within the scope of this disclosure.

[0109] The embodiments of this disclosure have been described above. However, these embodiments are for illustrative purposes only and are not intended to limit the scope of this disclosure. Although various embodiments have been described above, this does not mean that the measures in the various embodiments cannot be used advantageously in combination. The scope of this disclosure is defined by the appended technical solutions and their equivalents. Without departing from the scope of this disclosure, those skilled in the art can make various substitutions and modifications, all of which should fall within the scope of this disclosure.

Claims

1. A water tank for use in a water flosser, characterized in that, The water tank has the following features: Main body; and The bottom cover is detachably connected to the lower end of the main body. The oral irrigator can switch between a first state, a second state, and a third state. When the water flosser is in the first state, the bottom cover is connected to the main body in a manner that prevents water from leaking out of the water tank. When the water flosser is in the second state, a drainage and ventilation path is formed between the bottom cover and the main body to allow air to circulate inside and outside the water tank and to remove water. When the water flosser is in the third state, the bottom cover is not connected to the main body.

2. The water tank according to claim 1, characterized in that, Ventilation holes are provided at the bottom edge of the bottom cover.

3. The water tank according to claim 1 or 2, characterized in that, The main body is formed into a cylindrical shape with openings at both the top and bottom. A protrusion is formed at the center of the bottom of the bottom cover portion, which protrudes toward the main body portion and can seal the lower end opening of the main body portion. A body-side connecting portion is formed on the lower side of the main body, and this body-side connecting portion has external threads. A bottom cover side connection portion is formed on the side wall of the bottom cover portion, and the bottom cover side connection portion has an internal thread. When the water flosser is in the first state, the internal thread and the external thread are fully engaged, and the protrusion on the bottom cover liquid-tightly seals the lower opening of the main body. When the water flosser is in the second state, the internal thread and the external thread are partially engaged, and the protrusion of the bottom cover separates from the lower end opening of the main body to form a gap. This gap, together with the ventilation hole, constitutes part of the drainage and ventilation path. When the water flosser is in the third state, the internal thread and the external thread are not engaged, so the bottom cover is not connected to the main body.

4. The water tank according to claim 3, characterized in that, When the oral irrigator is in the first state, the protrusion contacts the lower opening of the main body in such a way that its top surface, through an elastic waterproof layer, liquid-tightly seals the lower opening of the main body. When the water flosser is in the first state, the protrusion contacts the lower opening of the main body in such a way that the lower opening of the main body is liquid-tightly sealed by an elastic waterproof ring.

5. The water tank according to claim 1, characterized in that, The main body is formed as a cylinder with an opening at the top and a bottom at the bottom. The bottom of the main body is formed as a hollow part that bulges upward. Ventilation holes are provided circumferentially on the sidewall of the hollow section. A locking protrusion is provided on the side wall of the hollow part, positioned above the ventilation hole. The bottom cover is formed into a column shape that can be embedded in the hollow part. A guide groove is provided on the side wall of the bottom cover to guide the engaging protrusion.

6. The water tank according to claim 5, characterized in that, The guide groove includes a guide groove opening into which the engaging protrusion slides, a first engaging portion for the engaging protrusion to engage and achieve positioning, and a second engaging portion located above the first engaging portion for the engaging protrusion to engage and achieve positioning. When the water flosser is in the first state, the bottom cover is fully embedded in the hollow portion, the engaging protrusion engages with the first engaging portion, and the bottom cover liquid-tightly seals the ventilation holes of the hollow portion. When the water flosser is in the second state, the bottom cover is partially embedded in the hollow portion, the engaging protrusion engages with the second engaging portion, and the ventilation hole of the hollow portion communicates with the guide groove of the bottom cover to jointly form part of the drainage and ventilation path. When the water flosser is in the third state, the bottom cover is not embedded in the hollow part, so that the bottom cover is not connected to the main body.

7. The water tank according to claim 6, characterized in that, The first engaging portion and the second engaging portion are located on the same side or on both sides of the guide groove opening relative to the guide groove opening.

8. The water tank according to claim 2, characterized in that, The main body is shaped with openings at both the top and bottom. The main body includes: The annular flat bottom portion; and The cylindrical portion extends downward from the inner edge of the flat bottom portion. An elastic portion capable of elastic deformation along the radial direction of the bottom cover portion is formed therein, and the elastic portion can abut against the inner circumferential surface of the cylindrical portion. The main body and the bottom cover can switch between the first state, the second state, and the third state by changing the contact state between the cylindrical part and the elastic part.

9. The water tank according to claim 8, characterized in that, The inner circumferential surface of the cylindrical portion includes a lower circumferential surface formed by gradually expanding its diameter downwards, an upper circumferential surface formed by gradually expanding its diameter upwards, and a dividing portion located between the lower circumferential surface and the upper circumferential surface. The elastic portion includes a plurality of elastic walls that rise upwards from the bottom of the bottom cover portion, and each elastic wall has a flange at its top. The plurality of elastic walls are arranged along the same circumference and formed at the center of the bottom of the bottom cover, closer to the center than the ventilation holes, and are spaced apart by a predetermined gap. When the water flosser is in the first state, the flange of the elastic wall abuts against the circumferential surface of the cylindrical part, and the bottom of the bottom cover liquid-tightly seals the lower opening of the cylindrical part. When the water flosser is in the second state, the flange of the elastic wall abuts against the lower circumferential surface of the cylindrical part, and the gap between the elastic walls communicates with the ventilation hole of the bottom cover to jointly form part of the drainage and ventilation path. When the water flosser is in the third state, the flange of the elastic wall does not abut against the cylindrical part, so the bottom cover is not connected to the main body.

10. The water tank according to claim 1, characterized in that, The main body is shaped with openings at both the top and bottom. The main body includes: The annular narrowing section; and The cylindrical portion extends downward from the inner edge of the reduced-diameter portion. The bottom cover portion has the following: A hollow section, formed by bulging upwards from the bottom of the bottom cover, has ventilation holes on its sidewalls and is capable of being embedded in the cylindrical section; and An elastic portion is provided at the bottom of the bottom cover portion at a position not opposite to the ventilation hole of the hollow portion, and is capable of elastically deforming along the radial direction of the bottom cover portion to abut against the outer peripheral surface of the cylindrical portion. The main body and the bottom cover can switch between the first state, the second state, and the third state by changing the contact state between the cylindrical part, the elastic part, and the hollow part.

11. The water tank according to claim 10, characterized in that, The elastic portion includes a plurality of elastic walls that rise upwards from the bottom of the bottom cover portion, and each elastic wall has a flange at its top. The plurality of elastic walls are arranged along the same circumference and form a predetermined gap between them. The outer peripheral surface of the cylindrical portion is formed with a first positioning portion for the flange portion to abut and be positioned, and a second positioning portion located below the first positioning portion for the flange portion to abut and be positioned. When the water flosser is in the first state, the hollow portion is embedded in the cylindrical portion, the flange portion of the elastic wall abuts against the first positioning portion of the cylindrical portion, and the elastic wall and the hollow portion liquid-tightly seal the lower opening of the cylindrical portion. When the water flosser is in the second state, the hollow portion is not embedded in the cylindrical portion, the flange portion of the elastic wall abuts against the second positioning portion of the cylindrical portion, and the gap between the elastic walls communicates with the ventilation hole of the hollow portion to jointly form part of the drainage and ventilation path. When the water flosser is in the third state, the hollow part is not embedded in the cylindrical part, the flange of the elastic wall does not abut against the cylindrical part, and thus the bottom cover is not connected to the main body.

12. A dental flosser, characterized in that, The oral irrigator includes: The subject; and The water tank according to any one of claims 1 to 11, The upper end of the main body of the water tank is detachably connected to the body.

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