Cap assembly and oral irrigator
Patent Information
- Application Number
- CN202522299249.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-10-30
- Publication Date
- 2026-11-03
- Estimated Expiration
- 2035-10-30
AI Technical Summary
The existing water inlet cap of oral irrigators is prone to loosening or falling off, and the sealing ring is easily worn, resulting in unstable sealing performance and frequent replacement.
An elastic sealing body is integrally molded on the outer bottom of the cover to form a radial static sealing pair. Combined with the design of a conical sealing surface and a guide surface, it achieves precise alignment and uniform compression, avoiding scratches and wear.
It improves the stability and durability of the sealing effect, extends the service life of the seals, simplifies operation, and enhances the user experience.
Smart Images
Figure CN224925247U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of oral irrigators, and further to a cover structure and an oral irrigator. Background Technology
[0002] Most mainstream water flossers on the market today use a simple vertical insertion design for their water inlet caps. The housing has a vertical circular hole, and the cap has a sealing ring with an outer diameter slightly larger than the hole. To close the cap, the user inserts it directly into the hole. The seal is achieved through the elastic deformation of the sealing ring and the friction between the ring and the hole wall. The sealing effect relies entirely on the radial expansion of the sealing ring under axial pressure and the static contact pressure generated between it and the vertical hole wall. When the water flosser is accidentally pulled or subjected to bumps and vibrations during travel, the cap can easily loosen or even fall off completely, potentially leading to cap loss or water ingress.
[0003] Furthermore, every time the cover is opened and closed, the sealing ring needs to undergo dry friction or abrasion with the wall of the round hole. Over time, this inevitably leads to wear on the surface of the sealing ring, material fatigue, and decreased elasticity. At the same time, the sealing ring is exposed to the outside for a long time, coming into contact with air, scale, and chemicals, which will accelerate its aging, hardening, and even cracking, eventually causing it to completely lose its sealing function and requiring frequent replacement by the user. Utility Model Content
[0004] To address the aforementioned technical problems, the purpose of this utility model is to provide a cover structure and a water flosser. The elastic sealing body is integrally formed on the outer bottom of the cover. The second conical sealing surface on the outer side of the elastic sealing body and the first conical sealing surface on the inner side of the sealing block form a radial static sealing pair, which can produce a better sealing effect than cylindrical surface mating, thereby more effectively preventing liquid leakage. Moreover, the first conical sealing surface of the second conical sealing surface has a good self-guiding effect, avoiding scratching between the sealing body and the inner wall of the sealing block, greatly delaying the aging and wear rate of the sealing body, and keeping the sealing effect stable for a long time.
[0005] To achieve the above objectives, this utility model provides a cover structure, including a second shell and a sealing cover;
[0006] The second housing is provided with a liquid inlet groove at the top, and a second liquid inlet channel is provided at the bottom of the liquid inlet groove. A sealing block is provided on the inner side wall of the top of the second liquid inlet channel. The inner side wall of the sealing block is a first conical sealing surface that gradually approaches the central axis of the second liquid inlet channel from top to bottom.
[0007] The sealing cap includes a cap body and an elastic sealing body. The elastic sealing body is integrally formed on the outer bottom of the cap body. The cap body is adapted to be accommodated in the liquid inlet groove. The outer wall of the elastic sealing body is provided with an annular sealing groove. The bottom of the annular sealing groove is a second conical sealing surface that gradually approaches the central axis of the second liquid inlet channel from top to bottom. The sealing block is adapted to be snapped into the annular sealing groove, so that the second conical sealing surface and the first conical sealing surface are pressed and adhered to each other by the elastic deformation of the elastic sealing body to form a radial seal.
[0008] In some embodiments, the bottom of the elastic sealing body is provided with a first guide surface, and the top of the sealing block is provided with a second guide surface adapted to the first guide surface. When the cover is closed, the first guide surface is adapted to slide along the second guide surface to guide the elastic sealing body to smoothly align and enter the second liquid inlet channel.
[0009] In some embodiments, the bottom and top walls of the annular sealing groove are both arc-shaped transitions to form an elastic abutment surface and a sealing contact surface. The elastic abutment surface is adapted to abut against the bottom end of the sealing block, and the sealing contact surface is adapted to fit against the second guide surface of the sealing block.
[0010] In some embodiments, the second conical sealing surface is further provided with a radially protruding sealing protrusion, which is adapted to be in interference fit with the second conical sealing surface of the sealing block.
[0011] In some embodiments, the bottom of the liquid inlet tank is a bearing slope that gradually descends radially along the second housing, and a second liquid inlet channel is vertically provided through the center of the bearing slope.
[0012] In some embodiments, the wall of the liquid inlet tank is a first conical guide surface that gradually converges inward from top to bottom, and a gap is left between one side of the first conical guide surface and the outer peripheral surface of the sealing cap to form a cap removal clearance opening.
[0013] In some embodiments, the cover includes a cover portion and a molding portion, the cover portion being located above the molding portion and the outer side wall of the cover portion being a second conical guide surface that gradually converges inward from top to bottom, for fitting with the first conical guide surface of the liquid inlet groove;
[0014] The molding portion extends downward from the bottom surface of the cover portion and is adapted to enter the second liquid inlet channel. The elastic sealing body is formed on the outside of the molding portion and fits against the sealing block.
[0015] In some embodiments, the top surface of the cover portion and the top surface of the second housing are smoothly connected to form a continuous surface;
[0016] The bottom of the cover is provided with an inner groove, and the top of the elastic sealing body is formed and anchored in the inner groove.
[0017] In some embodiments, the elastic sealing body is further provided with an anti-drop portion on one side, and an anti-drop hole is provided on the bearing inclined surface. The anti-drop portion is adapted to extend into the anti-drop hole and abut against and fix the end of the anti-drop hole.
[0018] According to another aspect of this application, a dental flosser is further provided, including any of the capping structures of the above preferred embodiments.
[0019] Compared with the prior art, the capping structure and oral irrigator provided by this utility model have at least one of the following beneficial effects:
[0020] 1. The elastic sealing body is integrally molded on the outer side of the bottom of the cover. The second conical sealing surface on the outer side of the elastic sealing body and the first conical sealing surface on the inner side of the sealing block form a radial static sealing pair, which can produce a better sealing effect than the cylindrical surface fit, thus more effectively preventing liquid leakage. Moreover, the first conical sealing surface of the second conical sealing surface has a good self-guiding effect, avoiding the scratching between the sealing body and the inner wall of the sealing block, greatly delaying the aging and wear rate of the sealing body, and keeping the sealing effect stable for a long time.
[0021] 2. The first guide surface and the second guide surface match each other, which can accurately guide the elastic sealing body to the target position, and finally make the annular sealing groove and the sealing block perfectly aligned. This prepares for the subsequent snap-fit and the fitting of the second conical sealing surface and the first conical sealing surface, greatly simplifying the operation and improving the user experience.
[0022] 3. The arc-shaped transition of the bottom and top walls of the annular sealing groove allows the clamping force applied by the sealing block to be evenly distributed throughout the elastic sealing body along a smooth curve, greatly avoiding excessive local stress, thereby protecting the sealing body and improving the reliability of long-term sealing.
[0023] 4. The sealing protrusion contacts the second conical sealing surface with a very small contact area, thereby producing a stronger sealing effect on both the first and second conical sealing surfaces and effectively preventing leakage. Attached Figure Description
[0024] The preferred embodiments will be described below in a clear and easy-to-understand manner, in conjunction with the accompanying drawings, to further explain the above-mentioned characteristics, technical features, advantages and implementation methods of this utility model.
[0025] Figure 1 This is a cross-sectional view of the capping structure;
[0026] Figure 2 This is a cross-sectional view of the second shell;
[0027] Figure 3 This is a cross-sectional view of the sealing cap.
[0028] Explanation of icon numbers:
[0029] The second housing 12, the second liquid inlet channel 120, the liquid inlet groove 121, the bearing inclined surface 1211, the first conical guide surface 1212, the sealing block 122, the first conical sealing surface 1221, and the second guide surface 1222 are all included.
[0030] Sealing cap 6, cap body 61, cap body portion 611, second conical guide surface 6111, recessed groove 6112, forming portion 612, elastic sealing body 62, annular sealing groove 621, second conical sealing surface 6211, elastic abutment surface 6212, sealing contact surface 6213, sealing protrusion 6214, first guide surface 622, anti-drop portion 623. Detailed Implementation
[0031] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the specific implementation methods of this utility model will be described below with reference to the accompanying drawings. Obviously, the drawings described below are merely some embodiments of this utility model. For those skilled in the art, other drawings and other implementation methods can be obtained based on these drawings without any creative effort.
[0032] To keep the drawings concise, each figure only schematically shows the parts relevant to the utility model, and these do not represent the actual structure of the product. Furthermore, for ease of understanding, in some figures, only one of the components with the same structure or function is schematically depicted, or only one is labeled. In this document, "one" not only means "only one," but can also mean "more than one."
[0033] It should also be further understood that the term “and / or” as used in this application specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.
[0034] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0035] Furthermore, in the description of this application, the terms "first," "second," etc., are used only for distinguishing descriptions and should not be construed as indicating or implying relative importance. It should be noted that the above embodiments can be freely combined as needed. The above are merely preferred embodiments of this utility model. It should be pointed out that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and these improvements and modifications should also be considered within the protection scope of this utility model.
[0036] refer to Figures 1 to 3 This utility model provides a cover structure, including a second housing 12 and a sealing cover 6; the top of the second housing 12 is provided with a liquid inlet groove 121, the bottom of the liquid inlet groove 121 is provided with a second liquid inlet channel 120, and the inner side wall of the top of the second liquid inlet channel 120 is provided with a sealing block 122, the inner side wall of the sealing block 122 being a first conical sealing surface 1221 that gradually approaches the central axis of the second liquid inlet channel 120 from top to bottom; the sealing cover 6 includes a cover body 61 and an elastic sealing body 62, the elastic sealing body 62 being integrally formed on the cover. The outer side of the bottom of the body 61 and the cover 61 are adapted to be accommodated in the liquid inlet groove 121. The outer wall of the elastic sealing body 62 is provided with an annular sealing groove 621. The bottom of the annular sealing groove 621 is a second conical sealing surface 6211 that gradually approaches the central axis of the second liquid inlet channel 120 from top to bottom. The sealing block 122 is adapted to be snapped into the annular sealing groove 621, so that the second conical sealing surface 6211 and the first conical sealing surface 1221 are pressed and adhered to each other by the elastic deformation of the elastic sealing body 62 to form a radial seal.
[0037] In this embodiment, the elastic sealing body 62 is integrally formed on the outer side of the bottom of the cover 61. The second conical sealing surface 6211 on the outer side of the elastic sealing body 62 and the first conical sealing surface 1221 on the inner side of the sealing block 122 form a radial static sealing pair, which can produce a better sealing effect than the cylindrical surface fit, thereby more effectively preventing liquid leakage. Moreover, the first conical sealing surface 1221 of the second conical sealing surface 6211 has a good self-guiding effect, avoiding the scratching between the sealing body and the inner wall of the sealing block 122, greatly delaying the aging and wear rate of the sealing body, and keeping the sealing effect stable for a long time.
[0038] Specifically, the top of the second housing 12 is provided with a liquid inlet groove 121, which serves as a base for accommodating the sealing cover 6. A second liquid inlet channel 120 is provided through the bottom of the liquid inlet groove 121, which is the channel for liquid to flow into the interior of the device. A sealing block 122 is disposed on the inner sidewall of the top of the second liquid inlet channel 120, and the inner sidewall of the sealing block 122 is constructed as a first conical sealing surface 1221. The diameter of the first conical sealing surface 1221 gradually decreases from top to bottom, that is, the first conical sealing surface 1221 converges towards the central axis of the second liquid inlet channel 120 from top to bottom. It can be understood that the longitudinal section of the first conical sealing surface 1221 resembles an inverted V-shape. The sealing cover 6 includes a cover body 61 and an elastic sealing body 62. The cover body 61 serves as the rigid skeleton of the sealing cover 6, and its top shape is precisely accommodated within the liquid inlet groove 121. The elastic sealing body 62 is fixed to the bottom outer side of the cover 61 by an integral molding process, which includes overmolding, two-color molding, etc., and is not further limited here. The integral molding of the elastic sealing body 62 and the cover 61 ensures a firm connection between the cover 61 and the elastic seal, avoiding the problems of detachment and twisting that may exist with separate sealing rings. On the outer wall of the elastic sealing body 62, there is an annular sealing groove 621. The bottom of the groove is also a conical surface, namely the second conical sealing surface 6211, whose inclination direction matches the first conical sealing surface 1221. When the cover is closed, the sealing block 122 on the second housing 12 will be inserted into the annular sealing groove 621 on the elastic sealing body 62. Moreover, when the sealing block 122 is inserted into the annular sealing groove 621, the first conical sealing surface 1221 and the second conical sealing surface 6211 are exactly facing each other. Through the elastic deformation of the elastic sealing body 62 itself, a uniform radial contact pressure is generated between the first conical sealing surface 1221 and the second conical sealing surface 6211, thereby forming the main sealing interface. Under the same axial pressing force, the fit between the first conical sealing surface 1221 and the second conical sealing surface 6211 can effectively convert the force into radial pressure perpendicular to the contact surface. Compared with the traditional cylindrical surface fit, this application can theoretically generate a larger effective sealing force, thereby more effectively preventing liquid leakage under static conditions and ensuring that the filling port has extremely high sealing reliability in any non-working state.
[0039] During the sealing process, the first conical sealing surface 1221 and the second conical sealing surface 6211 automatically guide the sealing cap 6 to align with the center position, achieving smooth alignment. This fundamentally avoids direct and destructive radial scraping between the elastic sealing body 62 and the inner wall of the sealing block 122, greatly reducing the wear of the elastic sealing body 62. Because wear is minimized, the material fatigue and aging rate of the elastic sealing body 62 are slowed down. This allows the sealing effect to remain stable over a long period, significantly improving the service life of the entire sealing structure and the reliability of the product.
[0040] Furthermore, the bottom of the elastic sealing body 62 is provided with a first guide surface 622, and the top of the sealing block 122 is provided with a second guide surface 1222 that is adapted to the first guide surface 622. When the cover is closed, the first guide surface 622 is adapted to slide along the second guide surface 1222 to guide the elastic sealing body 62 to smoothly align and enter the second liquid inlet channel 120.
[0041] In this embodiment, the first guide surface 622 and the second guide surface 1222 are matched with each other, which can accurately guide the elastic sealing body 62 to the target position, and finally make the annular sealing groove 621 and the sealing block 122 perfectly aligned, which prepares for the subsequent snap-fit and the second conical sealing surface 6211 and the first conical sealing surface 1221 to fit together, greatly simplifying the operation and improving the user experience.
[0042] Specifically, the first guide surface 622 is located at the bottom of the elastic sealing body 62, and during the closing process, the first guide surface 622 is the first to contact the sealing block 122. This can be understood as the first guide surface 622 being located at the outer edge of the lowest end of the elastic sealing body 62. The inclination angle and shape of the first guide surface 622 and the second guide surface 1222 are matched to form a funnel or flared inlet structure. When the first guide surface 622 contacts the second guide surface 1222, even if there is a certain initial positional deviation between the sealing cap 6 and the second liquid inlet channel 120, it can be automatically corrected.
[0043] More specifically, the user begins to close the sealing cap 6, and the first guide surface 622 at the bottom of the elastic sealing body 62 first contacts the second guide surface 1222 at the top of the sealing block 122. Under continuous downward pressure, the first guide surface 622 slides downward along the second guide surface 1222. Due to the effect of the inclined surface, any radial deviation is converted into a corrective force that pushes the elastic sealing body 62 toward the central axis of the second liquid inlet channel 120. As the sliding process continues, the elastic sealing body 62 is precisely guided to the target position, ultimately making the annular sealing groove 621 perfectly aligned with the sealing block 122, preparing for subsequent snap-fitting and tapered sealing surface contact. This avoids problems such as uneven contact of the sealing surface, unilateral wear, or excessive local stress caused by insertion misalignment, ensuring the sealing effect of the tapered sealing pair from the root. In use, the user does not need to painstakingly aim precisely; simply place the sealing cap 6 roughly into the liquid inlet groove 121 and press down, and the first guide surface 622 and the second guide surface 1222 will automatically complete the subsequent precise positioning. Moreover, the first guide surface 622 and the second guide surface 1222 provide a smooth transition, transforming potential impacts and friction into guided sliding, greatly reducing damage to the elastic seal 62 and extending its service life.
[0044] Preferably, the bottom and top walls of the annular sealing groove 621 are both arc-shaped transitions to form an elastic abutment surface 6212 and a sealing contact surface 6213. The elastic abutment surface 6212 is adapted to abut against the bottom end of the sealing block 122, and the sealing contact surface 6213 is adapted to fit against the second guide surface 1222 of the sealing block 122.
[0045] In this embodiment, the bottom and top walls of the annular sealing groove 621 are both arc-shaped transitions, which allows the clamping force applied by the sealing block 122 to be evenly distributed along a smooth curve throughout the entire elastic sealing body 62, greatly avoiding excessive local stress, thereby protecting the sealing body and improving the reliability of long-term sealing.
[0046] Specifically, the bottom and top walls of the annular sealing groove 621 both adopt arc-shaped transitions, rather than right angles or simple slopes. This means that the longitudinal section of the sealing groove presents a smooth, U-shaped profile.
[0047] The arc-shaped groove wall on the bottom side of the annular sealing groove 621 forms an elastic abutment surface 6212. When the sealing cover 6 is fully closed and the sealing block 122 is engaged at the bottom of the annular sealing groove 621, the elastic abutment surface 6212 abuts against the bottom end of the sealing block 122. Since the elastic sealing body 62 itself is made of flexible material, this abutment is a flexible contact with a buffering effect, which can absorb vibration and impact energy, prevent the sealing cover 6 from making abnormal noise or loosening when subjected to slight axial disturbance, and make the connection more stable and quieter.
[0048] The arc-shaped groove wall on the top side of the annular sealing groove 621 forms a sealing contact surface 6213. After closing, the sealing contact surface 6213 and the back of the second guide surface 1222 on the sealing block 122 achieve a large-area tight fit, making the contact between the sealing contact surface 6213 and the second guide surface 1222 of the sealing block 122 a broad surface contact rather than a sharp line contact. This not only provides a better sealing effect but also reduces the pressure per unit area and the wear rate is much lower than that of line contact, thus significantly extending the service life of the sealing pair. Moreover, the smooth arc-shaped contour avoids sharp corners, making it difficult for dirt and scale to accumulate. Even if there is residue, it is easier to clean, improving the product's hygiene performance.
[0049] Furthermore, the second conical sealing surface 6211 is also provided with a radially protruding sealing protrusion 6214, which is adapted to be in interference fit with the second conical sealing surface 6211 of the sealing block 122.
[0050] In this embodiment, the sealing protrusion 6214 contacts the second conical sealing surface 6211 with a very small contact area, thereby producing a stronger sealing effect on the first conical sealing surface 1221 and the second conical sealing surface 6211, effectively preventing leakage.
[0051] Specifically, the sealing protrusion 6214 is located at the axial center of the second conical sealing surface 6211. The sealing protrusion 6214 is a radially protruding annular rib, the cross-section of which can be circular, triangular, etc., and this application does not further limit it, as long as the sealing protrusion 6214 protrudes relative to the second conical sealing surface 6211. When the sealing cover 6 is closed, the highest point of the sealing protrusion 6214 will contact the first conical sealing surface 1221 on the sealing block 122 preferentially before the entire second conical sealing surface 6211, forming an interference fit. In the closed state, the sealing protrusion 6214 is elastically pressed against the inner wall of the sealing block 122, thereby forming another radial sealing barrier outside the second conical sealing surface 6211, significantly improving the sealing reliability. In long-term use, even if the second conical sealing surface 6211 has slight wear, the sealing protrusion 6214 can still continuously provide compensating contact pressure, maintain the effectiveness of the auxiliary sealing line, and thus extend the effective life of the sealing system.
[0052] It is worth noting that this application forms a multi-stage sealing structure through the sealing protrusion 6214. Even if the sealing capacity of the second conical sealing surface 6211 and the first conical sealing surface 1221 decreases, the sealing protrusion 6214 on the inner side of the second conical sealing surface 6211 can still act as an independent barrier to effectively prevent leakage, greatly improving the overall reliability, safety and fault tolerance of the sealing system.
[0053] Furthermore, the bottom of the liquid inlet tank 121 is a bearing slope 1211 that gradually descends radially along the second housing 12, and a second liquid inlet channel 120 is vertically provided in the center of the bearing slope 1211.
[0054] In this embodiment, gravity forces the liquid to automatically flow along the bearing slope 1211 to the lowest point and enter the second liquid inlet channel 120, which completely avoids the accumulation of liquid in the liquid inlet tank 121, eliminates the breeding ground for bacteria and scale, and keeps the liquid inlet tank 121 dry and clean.
[0055] Specifically, the bottom of the liquid inlet trough 121 is not a horizontal plane, but a bearing slope 1211 that gradually descends radially along the second housing 12. This can be understood as a smooth downward slope from the edge of the inlet trough 121 to the center of the second liquid inlet channel 120. The bearing slope 1211 can support the cover 61 of the sealing cap 6 and provide a guiding effect for liquid flow. Preferably, the wall of the liquid inlet trough 121 is a first conical guide surface 1212 that gradually converges inward from top to bottom. A gap is left between one side of the first conical guide surface 1212 and the outer peripheral surface of the sealing cap 6, forming a cap removal clearance opening. The first conical guide surface 1212 allows the inlet of the liquid inlet trough 121 to be larger than its bottom, and also facilitates wiping the bottom of the liquid inlet trough 121. Specifically, the side wall of the liquid inlet trough 121 is a first conical guide surface 1212 that gradually converges inward from top to bottom, like a funnel. This is a large-scale guide structure encountered by the sealing cap 6 when it enters the liquid inlet 121, used for initial, rough alignment. As long as the approximate position of the sealing cap 6 is within the groove opening of the liquid inlet 121, the first conical guide surface 1212 can automatically guide it to the center position during the pressing process, completing the initial, large-scale coarse positioning. A gap is intentionally left between one side of the groove wall of the first conical guide surface 1212 and the outer peripheral surface of the sealing cap 6, rather than a complete fit. This deliberately left space is the cap removal clearance. When the sealing ring has strong suction force or there is a slight negative pressure inside, the traditionally vertically inserted sealing cap 6 is extremely difficult to open. The cap removal clearance provides a clear prying space, allowing users to easily apply force with their fingernail or fingertip, saving effort and without damaging the sealing cap 6 or their fingernail.
[0056] Furthermore, the cover 61 includes a cover portion 611 and a molding portion 612. The cover portion 611 is located above the molding portion 612, and the outer wall of the cover portion 611 is a second conical guide surface 6111 that gradually converges inward from top to bottom, for fitting with the first conical guide surface 1212 of the liquid inlet groove 121. The molding portion 612 extends downward from the bottom surface of the cover portion 611 and is adapted to enter the second liquid inlet channel 120. The elastic sealing body 62 is formed on the outer side of the molding portion 612 and fits with the sealing block 122.
[0057] Specifically, the cover portion 611 is located above the entire sealing cover 6, and its outer wall is specially designed as a second conical guide surface 6111. The inclination direction of the second conical guide surface 6111 matches the first conical guide surface 1212 of the liquid inlet groove 121, achieving preliminary radial positioning and guidance. The forming portion 612 extends downward from the bottom surface of the cover portion 611 and can enter the second liquid inlet channel 120. It can be understood as a support, mainly serving as the forming base and rigid support for the elastic sealing body 62, and providing structural strength for the elastic sealing body 62, ensuring that the elastic sealing body 62 will not collapse or deform excessively under pressure. Moreover, the internal rigid forming portion 612 provides a solid support for the elastic sealing body 62, enabling the elastic sealing body 62 to undergo only controllable elastic deformation towards the support center when pressed against the sealing block 122, without being crushed or undergoing unpredictable twisting, ensuring the reliability and consistency of the seal. The elastic seal 62 is firmly bonded to the outside of the molded part 612 through an integral molding process such as overmolding. The cover part 611 and the molded part 612 can be made of rigid materials to ensure overall structural strength and dimensional stability; rigid materials include plastics such as ABS and PP. The elastic seal 62, on the other hand, is made of flexible sealing materials to provide excellent elasticity and sealing performance; flexible sealing materials include silicone and TPE. This effectively avoids the contradiction between strength and sealing performance that is difficult to achieve when using a single material.
[0058] Preferably, the top surface of the cover portion 611 and the top surface of the second housing 12 are smoothly connected to form a continuous surface. That is, the top surface of the cover portion 611 and the top surface of the second housing 12 are connected by a continuous, smooth curved surface, forming a continuous surface in appearance, which enhances aesthetics. The bottom of the cover portion 611 is provided with an indentation groove 6112, and the top of the elastic sealing body 62 is formed and anchored within this indentation groove 6112, increasing the contact area between the elastic sealing body 62 and the cover portion 61, and reducing the risk of the elastic seal falling off, shifting, or rotating. During the manufacturing process, the flexible material constituting the elastic sealing body 62 flows and fills this indentation groove 6112 in a molten state. After the material cools and solidifies, the top of the elastic seal 62 is no longer simply attached to the bottom surface of the cover 611, but is mechanically locked in the recessed groove 6112, forming an anchoring effect. This effectively prevents the elastic seal 62 from detaching, twisting or sliding from the cover 61, ensuring the long-term stability of the geometric position of the sealing pair, thereby guaranteeing the long-lasting and reliable sealing effect.
[0059] It is worth noting that one side of the elastic sealing body 62 is also provided with an anti-drop part 623, and the bearing inclined surface 1211 is provided with an anti-drop hole. The anti-drop part 623 is adapted to extend into the anti-drop hole and abut against and fix the end of the anti-drop hole. The anti-drop part 623 is a flexible strip or rope-like structure. The fixing structure of the anti-drop part 623 is all prior art in this application, and will not be described further here.
[0060] Furthermore, this application provides a water flosser including the capping structure found in any of the above embodiments. It should be noted that the above embodiments can be freely combined as needed. The above are merely preferred embodiments of this utility model. It should be pointed out that those skilled in the art can make several improvements and modifications without departing from the principle of this utility model, and these improvements and modifications should also be considered within the protection scope of this utility model.
Claims
1. A cover structure, characterized in that, Includes a second housing and a sealing cap; The second housing is provided with a liquid inlet groove at the top, and a second liquid inlet channel is provided at the bottom of the liquid inlet groove. A sealing block is provided on the inner side wall of the top of the second liquid inlet channel. The inner side wall of the sealing block is a first conical sealing surface that gradually approaches the central axis of the second liquid inlet channel from top to bottom. The sealing cap includes a cap body and an elastic sealing body. The elastic sealing body is integrally formed on the outer bottom of the cap body. The cap body is adapted to be accommodated in the liquid inlet groove. The outer wall of the elastic sealing body is provided with an annular sealing groove. The bottom of the annular sealing groove is a second conical sealing surface that gradually approaches the central axis of the second liquid inlet channel from top to bottom. The sealing block is adapted to be snapped into the annular sealing groove, so that the second conical sealing surface and the first conical sealing surface are pressed and adhered to each other by the elastic deformation of the elastic sealing body to form a radial seal.
2. The cover structure according to claim 1, characterized in that, The bottom of the elastic sealing body is provided with a first guide surface, and the top of the sealing block is provided with a second guide surface that is adapted to the first guide surface. When the cover is closed, the first guide surface is adapted to slide along the second guide surface to guide the elastic sealing body to smoothly align and enter the second liquid inlet channel.
3. The cover structure according to claim 2, characterized in that, The bottom and top walls of the annular sealing groove are both arc-shaped transitions to form an elastic abutment surface and a sealing contact surface. The elastic abutment surface is adapted to abut against the bottom end of the sealing block, and the sealing contact surface is adapted to fit against the second guide surface of the sealing block.
4. The cover structure according to claim 3, characterized in that, The second conical sealing surface is also provided with a radially protruding sealing protrusion, which is adapted to be in interference fit with the second conical sealing surface of the sealing block.
5. A covering structure according to any one of claims 1-4, characterized in that, The bottom of the liquid inlet tank is a bearing slope that gradually descends radially along the second shell, and a second liquid inlet channel is vertically provided in the center of the bearing slope.
6. A cover structure according to claim 5, characterized in that, The wall of the liquid inlet tank is a first conical guide surface that gradually converges inward from top to bottom. A gap is left between one side of the first conical guide surface and the outer peripheral surface of the sealing cap, forming a cover removal opening.
7. A cover structure according to claim 6, characterized in that, The cover includes a cover portion and a molding portion. The cover portion is located above the molding portion, and the outer wall of the cover portion is a second conical guide surface that gradually converges inward from top to bottom, for fitting with the first conical guide surface of the liquid inlet tank. The molding portion extends downward from the bottom surface of the cover portion and is adapted to enter the second liquid inlet channel. The elastic sealing body is formed on the outside of the molding portion and fits against the sealing block.
8. A cover structure according to claim 7, characterized in that, The top surface of the cover portion and the top surface of the second shell portion are smoothly connected to form a continuous surface; The bottom of the cover is provided with an inner groove, and the top of the elastic sealing body is formed and anchored in the inner groove.
9. A cover structure according to claim 7, characterized in that, The elastic sealing body is also provided with an anti-drop part on one side, and an anti-drop hole is provided on the bearing inclined surface. The anti-drop part is adapted to extend into the anti-drop hole and abut against and fix the end of the anti-drop hole.
10. A dental flosser, characterized in that, Includes a cover structure as described in any one of claims 1-9.