A dental flosser

Abstract

The utility model provides a water flosser, comprising: a main unit; a water tank, the water tank is sleeved on the outer peripheral surface of the main unit, the water tank is slidably connected to the main unit along a first direction, when the water tank is in the first position, the water storage space of the water tank has the smallest volume, and when the water tank is in the second position, the water storage space of the water tank has the largest volume; a sealing member, the sealing member is sleeved on the outer peripheral surface of the main unit and clamped between the inner wall surfaces of the main unit and the water tank, the sealing member slides relative to the water tank together with the main unit, the sealing member is arranged on one end of the outer peripheral surface of the main unit close to the water tank, and the sealing member slides between the first position and the second position; a groove is provided on the inner wall surface of the water tank, the groove extends in the longitudinal direction of the water tank, the extension length of the groove is greater than or equal to the sliding length of the seal, an air intake gap exists between the seal and the groove, the interior of the water tank can be connected to the atmosphere during the sliding process of the main unit, and the negative pressure formed inside the water tank to hinder the sliding of the main unit is avoided.

Description

Technical Field

[0001] The utility model relates to the field of oral health, in particular to a dental flosser. Background Art

[0002] The water flosser is an auxiliary tool for cleaning the oral cavity. It uses pulsed water flow to clean teeth and interdental spaces, thereby improving oral health. Due to business trips, travel, vacations, etc., if the water tank is large, the overall size of the water flosser is too large to be stored, and users have higher requirements for the portability of the water flosser.

[0003] In order to reduce the size of the oral irrigator, a more effective way is to reduce the length of the product, such as placing all or part of the main unit into a water tank when not in use. A specific solution is that the water tank is installed on the main unit and can slide relative to the main unit to change the size of the water chamber. When the oral irrigator is in use, the water in the water tank is transported to the nozzle through the main unit and sprayed out, causing the air pressure in the water tank to be lower than the outside air pressure. At this time, it is easy to slide the main unit into the water tank for storage, but when the oral irrigator is used again, it is difficult to slide the main unit to the use state because the air pressure in the water tank is lower than the outside air pressure. When the user uses it, he needs to open the plug of the water inlet of the water tank first, and wait for the internal and external air pressures to balance before the main unit can slide smoothly, which is a bad user experience. Summary of the invention

[0004] The utility model aims to provide a water flosser which is easy to use and can make the main unit slide smoothly, in view of the shortcomings of the prior art.

[0005] The utility model provides a tooth flosser, comprising:

[0006] A main machine, the main machine having a first end face and a second end face opposite to each other, and an outer peripheral surface connecting the first end face and the second end face, and the first end face is provided with a mounting port for mounting a nozzle;

[0007] A water tank, the water tank is sleeved on the outer peripheral surface and the second end surface is located in the water tank, the water tank is slidably connected to the main unit along a first direction, when the water tank is in a first position, the water storage space of the water tank has a minimum volume, and when the water tank is in a second position, the water storage space of the water tank has a maximum volume;

[0008] A sealing member, which is sleeved on the outer peripheral surface of the main unit and clamped between the main unit and the inner wall surface of the water tank, and slides relative to the water tank together with the main unit. The sealing member is arranged at one end close to the second end surface, and slides between a first position and a second position;

[0009] A groove is provided on the inner wall surface of the water tank, the groove extends in the longitudinal direction of the water tank, and the extension length of the groove is greater than or equal to the sliding length of the sealing element.

[0010] In a specific embodiment, a groove is provided on the inner wall surface of the water tank, and the groove extends in the longitudinal direction of the water tank and the extension length is greater than or equal to the sliding length of the seal, that is, the seal is always within the length range of the groove, and there is an air intake gap between the seal and the groove. In addition, with the cooperation of the groove and the seal, the interior of the water tank can always be connected to the atmosphere during the sliding process of the main unit, thereby avoiding the formation of negative pressure inside the water tank to hinder the sliding of the main unit, thereby ensuring that the main unit can slide smoothly relative to the water tank. When in use, the user can directly slide the main unit out without other operations, thereby improving the convenience of operation and providing a good user experience.

[0011] Furthermore, a clamping portion is provided on the inner wall of the water tank, and a first sealing portion is provided between the clamping portion and the groove. The function of the first sealing portion is to ensure the sealing of the water tank. When the water flosser is in the second position, it can not only ensure that the water in the water tank will not leak out in a tilted state, but also prevent the sewage after flushing from flowing back into the water tank and causing pollution of the flushing water.

[0012] Furthermore, the number of the grooves is greater than or equal to 1, and one or more grooves can be provided according to specific needs of the product to increase the air intake efficiency.

[0013] Furthermore, the width of the groove ranges from 2mm to 18mm. When the width of the groove is within this range, on the one hand, the efficiency of air intake can be ensured, and on the other hand, the sealing of the oral irrigator can be prevented from being poor due to the width of the groove being too wide.

[0014] Furthermore, there are two grooves, which are arranged opposite to each other. According to the water flosser of the utility model, two grooves are provided on the inner wall surface of the water tank, which are arranged opposite to each other and extend along the longitudinal direction of the water tank. The setting of the two grooves increases the air intake gap, making the sliding of the main unit more labor-saving.

[0015] Furthermore, a first side surface and a second side surface are provided on the outer circumferential surface of the main unit, a slide groove is provided on the first side surface, the slide groove extends in the longitudinal direction of the main unit, a limiting structure is provided on the slide groove, the limiting structure and the clamping portion are used to cooperate to limit the position of the water tank, and the limiting structure and the clamping portion are used to cooperate to limit the extreme position of the main unit when it moves upward and downward, so that the main unit will not fall off or hit other structures during the up and down movement.

[0016] Furthermore, the limiting structure includes a first limiting portion and a second limiting portion. When the water tank is in the first position, the clamping portion and the first limiting portion cooperate in limiting position. At this time, the volume of the water flosser is the smallest, which is convenient for storage. When the water tank is in the second position, the clamping portion and the second limiting portion cooperate in limiting position. At this time, the volume of the water flosser is the largest, and the water tank is in an open state, which is convenient for users to use.

[0017] Furthermore, the second limiting portion includes a first protrusion and a second protrusion, the first protrusion and the second protrusion are arranged at intervals along the longitudinal direction of the main unit and the second protrusion is closer to the second end face, the seal is located between the second protrusion and the second end face, the water tank and the main unit are sealed and connected through the seal, and the seal is arranged on the second end face close to the main unit. The seal can improve the sealing effect between the water tank and the main unit.

[0018] Furthermore, the longitudinal length of the first sealing portion along the water tank is L1, and the longitudinal length between the second protrusion and the second end face is L2, and L1 is greater than or equal to L2, that is, the length of the first sealing portion along the longitudinal direction of the main unit is greater than or equal to the longitudinal length between the second protrusion and the second end face, that is, the width of the first sealing portion is always greater than the width of the sealing ring, and the cooperation of the two can achieve a better sealing effect.

[0019] Furthermore, the first limiting portion includes a third protrusion and a fourth protrusion, and a second sealing portion is arranged between the fourth protrusion and the first end face. The second sealing portion cooperates with the first sealing portion to prevent dust and other pollutants from entering the interior of the water flosser through the fitting gap between the water tank and the main unit, thereby ensuring the hygiene inside the water tank and reducing the risk of bacteria breeding and dirt harboring in the gap space.

[0020] The utility model provides a water flosser, which effectively increases the air intake gap by providing a groove extending longitudinally of the water tank on the inner wall surface of the water tank, and the length of the groove is greater than or equal to the sliding length of the seal, thereby avoiding difficulty in pulling out the main unit from the water tank due to the negative pressure of the water chamber. After the user gets the water flosser, the main unit can be directly pulled out without opening the water tank cover and waiting for the internal and external air pressures to be balanced before operating. The use is convenient and the user experience is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0022] Figure 1 A schematic diagram of the oral rinser according to an embodiment of the utility model in a first position;

[0023] Figure 2 A schematic diagram of the oral irrigator according to an embodiment of the utility model in the second position;

[0024] Figure 3 This is a schematic diagram of the structure of the main unit of the oral irrigator according to an embodiment of the utility model;

[0025] Figure 4 The cross-sectional structure of the water flosser of the utility model is shown in FIG. Figure 1;

[0026] Figure 5 It is a schematic cross-sectional structure diagram of a water tank of a water flosser according to an embodiment of the utility model;

[0027] Figure 6 yes Figure 3 The enlarged schematic diagram of point A in the middle;

[0028] Figure 7 yes Figure 3 The enlarged schematic diagram of point B in the middle;

[0029] Figure 8 A schematic diagram of a second side surface of the oral irrigator according to an embodiment of the utility model;

[0030] Fig. 9 The cross-sectional structure of the water flosser of the utility model is shown in FIG. Figure 2 ;

[0031] Fig.10 This is a schematic diagram of a first embodiment of a groove in an embodiment of the utility model;

[0032] Fig.11 This is a schematic diagram of a second embodiment of the groove in the embodiment of the utility model;

[0033] Fig.12 This is a schematic diagram of a third embodiment of the groove in the embodiment of the utility model;

[0034] Fig.13 This is a schematic diagram of a fourth embodiment of the groove in the embodiment of the utility model.

[0035] In the figure, the reference numerals are as follows: 1000-water flosser; 100-main unit; 101-first end surface; 102-second end surface; 103-peripheral surface; 104-first side surface; 1041-sliding groove; 105-second side surface; 1051-storage cavity; 106-limiting structure; 1061-first limiting portion; 1062-second limiting portion; 1063-first protrusion; 1064-second protrusion; 1065 -third protrusion; 1066-fourth protrusion; 107-installation port; 108-button; 200-water tank; 201-first position; 202-second position; 203-inner wall; 204-groove; 205-holding portion; 206-first sealing portion; 207-bottom; 208-side wall; 209-water inlet; 210-blocking cover; 211-second sealing portion; 212-spacer; 300-seal. DETAILED DESCRIPTION

[0036] 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.

[0037] The components of the embodiments of the present application generally described and shown in the drawings herein may be arranged and designed in various configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application claimed for protection, but merely represents the selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the present application.

[0038] Hereinafter, the terms "including", "having" and their cognates that can be used in various embodiments of the present application are intended only to indicate specific features, numbers, steps, operations, elements, components or a combination of the foregoing items, and should not be understood as first excluding the existence of one or more other features, numbers, steps, operations, elements, components or a combination of the foregoing items or increasing the possibility of one or more features, numbers, steps, operations, elements, components or a combination of the foregoing items. In this regard, the terms "first", "second", "third" and the like are only used to distinguish descriptions and cannot be understood as indicating or implying relative importance.

[0039] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a rotational connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0040] In conjunction with the accompanying drawings, some embodiments of the invention are described in detail with reference to the example of a dental flosser. In the absence of conflict, the following embodiments and features of the embodiments may be combined with each other.

[0041] like Figure 1 and Figure 2As shown, an embodiment of the utility model provides a water flosser 1000, including a main unit 100 and a water tank 200. The water tank 200 is slidably connected to the main unit 100 along a first direction, that is, the water tank 200 can slide relative to the main unit 100 to switch the water tank 200 between a contracted state and a use state. It should be noted that the first direction is consistent with the central axis direction of the water flosser 1000. In some embodiments, the first direction may be parallel to the direction of gravity, and in other embodiments, the first direction may also be parallel to the horizontal direction.

[0042] It is understandable that when the water tank 200 is in the first position 201, that is, the oral irrigator is in a retracted state, the water storage space of the water tank 200 has the smallest volume, the water tank 200 and the main unit 100 have a large overlap area, and the overall volume of the oral irrigator 1000 is small, which is convenient for storage. When the water tank is in the second position 202, that is, the oral irrigator is in use, the water storage space of the water tank 200 has the largest volume, and the water tank 200 can store more water, which increases the flushing time of the oral irrigator 1000 and avoids the user from adding water to the water tank 200 multiple times during use.

[0043] Combined with Figure 3 The main unit 100 has a first end face 101 and a second end face 102 facing each other, and an outer peripheral surface 103 connecting the first end face 101 and the second end face 102. The first end face 101 is provided with an installation port 107 for installing a nozzle (not shown in the figure). The main unit 100, as a main component of the water flosser 1000, can suck out the liquid in the water tank 200 and spray it outward through the nozzle, thereby washing away the residue on the teeth to achieve the effect of cleaning the oral teeth. A hollow channel is formed inside the nozzle so that the liquid drawn out of the water tank 200 by the main unit 100 can be sprayed out through the hollow channel.

[0044] Specifically, the water tank 200 has an opening on one side facing the main unit 100, and the shape of the opening can be adapted to the cross-sectional shape of the main unit 100, so that the main unit 100 can extend into the water tank 200 from the opening, and the internal shape of the water tank 200 can be adapted to the contour shape of the main unit 100, so that the main unit 100 can be better stored in the water tank 200 to reduce the overall volume when stored. The water tank 200 is sleeved on the outer peripheral surface 103 and the second end surface 102 is located in the water tank 200, that is, the second end surface 102 is not visible during normal use of the oral irrigator 1000. A first side surface 104 and a second side surface 105 are provided on the outer peripheral surface 103, a button 108 is provided on the second side surface 105, a slide groove 1041 is provided on the first side surface 104, the slide groove 1041 extends along the longitudinal direction of the main unit 100, a limiting structure 106 is provided on the slide groove 1041, the limiting structure 106 and the clamping portion 205 are used to limit the position of the water tank 200, and the limiting structure 106 and the clamping portion 205 are used to limit the extreme position of the main unit 100 when it moves upward and downward, so that the main unit 100 will not fall off or hit other structures during the up and down movement. The limiting structure 106 includes a first limiting portion 1061 and a second limiting portion 1062. When the water tank 200 is in the first position 201, the clamping portion 205 and the first limiting portion 1061 are limited and matched. At this time, the volume of the water flosser 1000 is the smallest, which is convenient for storage. When the water tank 200 is in the second position 202, the clamping portion 205 and the second limiting portion 1062 are limited and matched. At this time, the volume of the water flosser is the largest, and the water tank 200 is in an open state, which is convenient for users to use. Figure 3 As shown, the longitudinal direction of the host 100 is the indication direction of the Y axis, and the lateral direction of the host 100 is the indication direction of the X axis.

[0045] like Figure 3 and Figure 4As shown, the sealing member 300 is sleeved on the outer peripheral surface 103 and clamped between the main unit 100 and the inner wall surface of the water tank 200. The sealing member 300 slides relative to the water tank 200 together with the main unit 100. The sealing member 300 is arranged at one end close to the second end surface 102. The sealing member 300 slides between the first position 201 and the second position 202. A groove 204 is provided on the inner wall surface of the water tank 200. The groove 204 extends in the longitudinal direction of the water tank 200. The extension length of the groove 204 is greater than or equal to the sliding length of the sealing member 300, that is, the groove 204 is completely The sliding path of the seal 300 is covered, that is, the seal 300 is always within the length range of the groove 204. During the sliding process, there is always a gap between the seal 300 and the groove 204. During the sliding process of the host 100, the inside of the water tank 200 can always be connected to the atmosphere, avoiding the formation of negative pressure inside the water tank 200 to hinder the sliding of the host 100, thereby ensuring that the host 100 can slide smoothly relative to the water tank 200, that is, when the user is in use, the host 100 can be directly slid out without other operations, thereby improving the convenience of operation and providing a good user experience.

[0046] It is understandable that the number of the grooves 204 is set to be greater than or equal to 1, and one or more grooves 204 can be set according to the specific needs of the product to increase the air intake efficiency. Figure 5 As shown, the width L3 of the groove 204 ranges from 2 mm to 18 mm. Within the width L3 range, on the one hand, the efficiency of air intake can be ensured, and on the other hand, the sealing of the oral irrigator is prevented from being poor due to the width of the groove being too wide. In other embodiments, the width of the groove 204 can also be set to any other value of 2 mm, 3 mm, 3.5 mm, 4.2 mm, 5 mm, 5.8 mm, 6 mm, 6.7 mm, 7 mm, 8 mm, 9 mm, 10 mm, 11 mm, 12 mm, 13 mm, 14.3 mm, 15.6 mm, 17 mm or 18 mm.

[0047] In a specific embodiment, the number of the grooves 204 is set to 2, and the two grooves 204 are arranged opposite to each other. For the convenience of production, the width and length of the two grooves are set to be consistent. Of course, the width and length of the two grooves can also be set to be inconsistent. Fig.10 As shown, the widths of the two grooves 204 are inconsistent, one side is wider and the other side is narrower. Figure 5 and Fig.11 As shown, the lengths of the two grooves 204 are inconsistent, one side is longer and the other side is shorter.

[0048] like Figure 3 , Figure 6 and Figure 7As shown, the main unit 100 further includes an upper cover 109, the first limiting portion 1061 includes a third protrusion 1065 and a fourth protrusion 1066, and a second sealing portion 211 is provided between the fourth protrusion 1066 and the upper cover 109. When the water tank is in the first position 201, the second sealing portion 211 cooperates with the first sealing portion 206 to prevent dust and other pollutants from entering the inside of the water flosser through the matching gap between the water tank 200 and the main unit 100, thereby ensuring the sanitation inside the water tank 200 and reducing the risk of bacteria breeding and dirt in the gap space. The second limiting portion includes a first protrusion 1063 and a second protrusion 1064, the first protrusion 1063 and the second protrusion 1064 are arranged at intervals along the longitudinal direction of the main unit 100, and the second protrusion 1064 is closer to the second end face 102, and the sealing member 300 is located between the second protrusion 1064 and the second end face 102. The longitudinal length between the second protrusion 1064 and the second end face 102 is L2.

[0049] In a specific embodiment, the longitudinal length distance between the second protrusion 1064 and the second end face 102 ranges from 3mm to 25mm. Preferably, the length range of L2 is 4mm to 15mm. The distance between the second protrusion 1064 and the second end face 102 should not be too small. If the distance is too small, the connection stability between the water tank 200 and the host 100 will be weak. The distance between the second protrusion 1064 and the second end face 102 should not be too large. Since the second end face 102 extends into the interior of the water tank 200, a large distance will affect the water storage space inside the water tank 200 and reduce the water storage capacity.

[0050] like Figure 5 As shown, the inner wall surface 203 of the water tank 200 is provided with a clamping portion 205, and a first sealing portion 206 is provided between the clamping portion 205 and the groove 204. The longitudinal length of the first sealing portion 206 along the water tank 200 is L1, and L1 is greater than or equal to L2, that is, the width of the first sealing portion 206 is always greater than the width of the sealing member 300. The function of the first sealing portion 206 is to ensure the sealing of the water tank. When the flushing tooth 1000 is in the second position, it can not only ensure that the water in the water tank 200 will not leak out in the tilted state, but also prevent the sewage after flushing from flowing back into the water tank 200, causing the pollution of the flushing water. Preferably, the ratio range of L1 and L2 is 1:1-3:1. In other embodiments, the ratio range of L1 and L2 can also be set to any other value of 1.2:1, 1.5:1, 1.7:1, 1.9:1, 2:1, 2.3:1, 2.6:1, 2.8:1 or 3:1. It can be understood that the seal 300 is an annular waterproof sealing ring, and an annular groove (not shown in the figure) is provided on the side of the main unit 100 close to the second end face 102. The annular groove and the sealing ring are adapted to each other, which can limit the sealing ring and prevent the sealing ring from being displaced when the main unit 100 slides relative to the water tank 200.

[0051] It is understandable that when the water tank 200 is in the first position 201, the clamping portion 205 and the first limiting portion 1061 are limited and matched, and the volume of the water flosser is the smallest, which is convenient for storage. When the water tank 200 is in the second position 202, the clamping portion 205 and the second limiting portion 1062 are limited and matched, and the volume of the water flosser is the largest, and the water tank is in an open state, which is convenient for users to use. The setting of the slide 1041 can have a certain avoidance effect on the clamping portion 205. During the pulling process, the clamping portion 205 can slide smoothly in the slide 1041, with avoidance space, no obstacles, and low friction. Along the circumferential direction of the host 100, the slide 1041 is connected to other surfaces of the host 100 through a circular arc surface transition. In this way, the slide 1041 connected by the circular arc surface transition will not affect the user's feel when holding the host 100, and enhance the user's experience.

[0052] like Figure 5 and Figure 8 As shown, the third sealing part 213 is between the clamping part 205 and the opening end of the water tank 200, the longitudinal length from the third sealing part 213 to the opening of the water tank 200 is L5, the longitudinal length from the second sealing part 211 to the upper cover 109 is L4, L5 is greater than or equal to L4, that is, the width of the third sealing part 213 is greater than or equal to the width of the second sealing part 211, when the water tank 200 is in the first position 201, the third sealing part 213 and the second sealing part 211 are tightly fitted, which can improve the sealing between the water tank 200 and the host 100 and reduce the risk of bacteria breeding and dirt in the gap space. A storage cavity 1051 is provided on the second side 102 of the host, and the nozzle (not shown in the figure) is stored in the storage cavity 1051, which not only prevents the nozzle from being contaminated, but also prevents the nozzle from being lost alone, and does not occupy space.

[0053] like Figure 8 and Fig. 9 As shown, the water tank 200 has a bottom 207, and a water inlet 209 with a plug cover 210 is also provided on the water tank 200. The water inlet 209 can be provided on the side wall or the bottom 207 of the water tank 200, and the water inlet 209 is located on the side of the sealing member 300 facing the bottom 207. Therefore, the water inlet 209 will not affect the sliding of the water tank 200 relative to the host 100, and the host 100 will not hinder the use of the water inlet 209.

[0054] Figures 10 to 13 are four specific embodiments of the groove 204, Fig.10 In the embodiment, the widths of the two opposite grooves 204 are not consistent. Fig.11 In the embodiment, the lengths of the two opposite grooves 204 are not consistent. Fig.12 In the embodiment, a spacing section 212 is provided in the middle of the groove 204. Fig.13In the embodiment, the groove 204 extends to the bottom of the water tank 200. In addition, the shape of the groove 204 can also be U-shaped, that is, the two opposite grooves 204 extend to the bottom 207 of the water tank and communicate with each other. There are too many other shapes of grooves to list here. Similar schemes or scenarios of providing grooves on the inner wall of the water tank for balancing the internal and external air pressures as proposed by the present invention should be understood to be within the scope of the present application.

[0055] Compared with the prior art, the main unit is difficult to slide to the use state due to the pressure difference between the inside and outside of the water tank. When using it, the user needs to open the plug cover of the water inlet of the water tank first, and wait for the internal and external air pressure to balance before the main unit can slide smoothly. The utility model patent opens a groove on the inner wall surface of the water tank, and the groove extends along the longitudinal direction of the water tank and the extension length is greater than or equal to the sliding length of the seal, that is, the seal is always within the length range of the groove, and there is an air intake gap between the seal and the groove. Under the cooperation of the groove and the seal, the inside of the water tank can always be connected to the atmosphere during the sliding process of the seal, avoiding the formation of negative pressure inside the water tank to hinder the sliding of the main unit, thereby ensuring that the main unit can slide smoothly relative to the water tank, that is, when using it, the user can directly slide the main unit out without other operations, which improves the convenience of operation and provides a good user experience.

[0056] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A water flosser, characterized in that: include: A mainframe, the mainframe having a first end face and a second end face opposite to each other, and an outer peripheral surface connecting the first end face and the second end face, the first end face being provided with a mounting port for mounting a nozzle; a water tank, wherein the water tank is sleeved on the outer peripheral surface and the second end surface is located in the water tank, the water tank is slidably connected to the main unit along a first direction, when the water tank is in a first position, the water storage space of the water tank has a minimum volume, and when the water tank is in a second position, the water storage space of the water tank has a maximum volume; A sealing member, the sealing member is sleeved on the outer peripheral surface of the main unit and clamped between the main unit and the inner wall surface of the water tank, the sealing member slides relative to the water tank together with the main unit, the sealing member is arranged at one end close to the second end surface, and the sealing member slides between the first position and the second position; A groove is provided on the inner wall surface of the water tank, and the groove extends in the longitudinal direction of the water tank. The extension length of the groove is greater than or equal to the sliding length of the sealing member.

2. The oral rinser according to claim 1, characterized in that: A clamping portion is arranged on the inner wall of the water tank, and a first sealing portion is arranged between the clamping portion and the groove.

3. The oral rinser according to claim 1, characterized in that: The number of the grooves is greater than or equal to one.

4. The oral rinser according to claim 1, characterized in that: The width of the groove ranges from 2 mm to 18 mm.

5. The oral rinser according to claim 3, characterized in that: The number of the grooves is two, and the two grooves are arranged opposite to each other.

6. The oral rinser according to claim 2, characterized in that: The main unit is provided with a first side surface and a second side surface on its outer circumferential surface, the first side surface is provided with a slide groove, the slide groove extends in the longitudinal direction of the main unit, a limiting structure is provided on the slide groove, and the limiting structure and the clamping portion are used to limit the position of the water tank.

7. The oral rinser according to claim 6, characterized in that: The limiting structure includes a first limiting portion and a second limiting portion. When the water tank is in the first position, the clamping portion and the first limiting portion cooperate in limiting manner. When the water tank is in the second position, the clamping portion and the second limiting portion cooperate in limiting manner.

8. The oral rinser according to claim 7, characterized in that: The second limiting portion includes a first protrusion and a second protrusion, the first protrusion and the second protrusion are arranged at intervals along the longitudinal direction of the host, and the second protrusion is closer to the second end surface, and the sealing member is located between the second protrusion and the second end surface.

9. The oral rinser according to claim 8, characterized in that: The longitudinal length of the first sealing portion along the water tank is L1, the longitudinal length between the second protrusion and the second end surface is L2, and L1 is greater than or equal to L2.

10. The oral rinser according to claim 7, characterized in that: The first limiting portion includes a third protrusion and a fourth protrusion, and a second sealing portion is arranged between the fourth protrusion and the first end surface.

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