Inner plug structure and water cup

Abstract

The utility model discloses an inner plug structure and a water cup. The inner plug structure comprises a connecting cover body, a bottom support assembly and an opening and closing assembly. A mounting cavity channel is formed in the connecting cover body; the bottom support assembly comprises a water passing ring, a push rod and a bottom cover. The water passing ring is connected to the end of the mounting cavity channel through breakpoint threads, and a plurality of water passing holes are formed in the circumferential direction of the water passing ring, so that a water passing channel allowing liquid to pass through is formed between the water passing ring and the connecting cover body; a guide hole is formed in the water passing ring; the push rod comprises a rod body, a brake end and a pressure relief end are formed at the two ends respectively, and the rod body penetrates through the guide hole. A pressure relief hole is formed in the bottom cover, the rod body can penetrate through the pressure relief hole, and a pressure relief channel is formed between the pressure relief hole and the rod body; the opening and closing assembly is installed at the other end of the installation cavity channel and used for pushing the push rod to horizontally move in the guide hole, and the pressure relief channel and the water passing channel are opened. The water cup can balance internal and external pressure, is convenient to press and discharge water, and is convenient to clean.

Description

Technical Field

[0001] This utility model relates to the field of drinking water equipment technology, specifically to an inner plug structure and a water cup. Background Technology

[0002] Water cups are very common containers for holding drinking water in our daily lives. They have a sealing and heat-insulating function and are convenient for us to carry and drink from. Some water cups are designed with an inner stopper to separate the liquid inside.

[0003] Traditional cup lids with inner stoppers typically have an outer lid screwed onto the cup body, and the opening and closing of the inner stopper is controlled by a pop-up button that moves the lid plate. Current inner stoppers have the following problems in practical applications: First, when there is a significant pressure difference between the inside and outside of the cup, the pop-up button is unlikely to push the lid plate open the inner stopper; second, the part of the inner stopper that is frequently in direct contact with drinking water cannot be disassembled, making thorough cleaning difficult and prone to bacterial growth. Utility Model Content

[0004] In order to overcome the shortcomings of the existing technology, the purpose of this utility model is to provide an inner plug structure and a water cup that can balance the pressure inside and outside the water cup, facilitate water dispensing by pressing, and facilitate cleaning.

[0005] One of the objectives of this utility model is to provide an inner plug structure, which is achieved by the following technical solution:

[0006] An inner plug structure, characterized in that it includes a connecting cover, a base assembly, and an opening / closing assembly;

[0007] The outer side of the connecting cover is used to connect with the body of the water cup, and an installation cavity is formed inside. The installation cavity is used to install the bottom cover assembly and the opening and closing assembly.

[0008] The base support assembly is installed at one end of the mounting cavity. The base support assembly includes a water-passing ring, a push rod, and a bottom cover. The water-passing ring is connected to the end of the mounting cavity via a broken thread. The water-passing ring has several water-passing holes formed circumferentially, thereby forming a water-passing channel between the water-passing ring and the connecting cover for liquid to pass through. A guide hole is formed inside the water-passing ring. The push rod includes a rod body, with a braking end and a pressure relief end formed at both ends of the rod body, and the rod body passes through the guide hole. A pressure relief hole is formed on the bottom cover, through which the rod body passes, thereby forming a pressure relief channel between the pressure relief hole and the rod body.

[0009] The opening and closing assembly is installed at the other end of the installation cavity. The opening and closing assembly is used to push the push rod, thereby causing the push rod to move horizontally in the guide hole, driving the pressure relief end away from the pressure relief hole, opening the pressure relief channel, and driving the bottom cover away from the water ring, opening the water passage channel.

[0010] In one optional embodiment, the braking end of the push rod is provided with a limiting ring; a first limiting groove and a second limiting groove are respectively formed on opposite sides of the water-passing ring; and a third limiting groove is formed on the upper side of the bottom cover.

[0011] The base support assembly also includes a first elastic element, which is sleeved on the body of the push rod. One end of the first elastic element is disposed in the first limiting groove, and the other end abuts against the limiting ring. The first elastic element provides an elastic force that drives the push rod to translate in the direction of the opening and closing assembly.

[0012] The base support assembly also includes a second elastic element, which is sleeved on the body of the push rod. One end of the second elastic element is disposed in the second limiting groove, and the other end is disposed in the third limiting groove. The elastic force provided by the second elastic element presses the bottom cover against the pressure relief end of the push rod, sealing the pressure relief end in the pressure relief hole, so that the pressure relief channel is normally kept closed.

[0013] In one optional embodiment, a protrusion is formed inside the limiting ring;

[0014] The push rod braking end has a circumferentially formed locking groove, and the push rod braking end has a radially opened entry channel and a closing channel. One end of the entry channel is connected to the locking groove, and the other end is an open opening. One end of the closing channel is connected to the locking groove, and the other end is a closed opening. The protrusion in the limiting ring enters the locking groove from the open opening of the entry channel, and then enters the closing channel after passing through the locking groove. The elastic force of the first elastic element restricts the protrusion in the limiting ring to the closing channel, thus fixing the limiting ring to the braking end of the push rod.

[0015] In one optional embodiment, the outer edge of the water-passing ring is formed with a skirt; the push rod has a groove formed circumferentially on its shaft.

[0016] It also includes a sealing assembly, which includes a first sealing ring, a second sealing ring and a third sealing ring;

[0017] The first sealing ring is fitted onto the skirt surface; by screwing the water-passing ring to the connecting cover, one side of the first sealing ring is pressed between the water-passing ring and the connecting cover; when the water-passing channel is closed, the first sealing ring contacts the bottom cover, thereby forming a sealing surface between the first sealing ring and the bottom cover;

[0018] The second sealing ring is fitted onto the pressure relief end. When the pressure relief channel is closed, the second sealing ring contacts the bottom cover to form a sealing surface.

[0019] The third sealing ring is fitted inside the groove of the push rod body, and the outer side of the third sealing ring contacts the guide hole, thereby forming a dynamic seal between the third sealing ring and the inner wall of the guide hole.

[0020] In one optional embodiment, a snap-fit ​​groove is formed on the outer side of the connecting cover;

[0021] It also includes a filter cartridge with several filter holes on its surface and a fastening ring formed on the upper edge of the filter cartridge. The filter cartridge is connected to the connecting cover by the fastening ring engaging with the fastening groove.

[0022] In one optional embodiment, the opening and closing assembly includes an outer top component, an inner top component, a pressing component, and a rotating component;

[0023] The outer top component is screwed to the water-passing ring at its end. The inner top component is embedded inside the outer top component. The rotating component is installed at the lower part of the pressing component. The rotating component and the pressing component are embedded inside the inner top component as a whole. By applying pressure to the pressing component, the rotating component slides inside the inner top component, pushing the push rod to move horizontally in the guide hole, thereby opening the water-passing channel and the pressure relief channel.

[0024] In one optional embodiment, the lower inner side of the inner top component has alternating long and short rotating grooves; the lower outer side of the pressing component has equidistant upper levers, the bottom of the pressing component has teeth, the lower outer side of the rotating component has an annular seat, and the annular seat has equidistant lower levers; the bottom teeth of the pressing component are engaged with the outer side of the rotating component; the tops of the equidistant lower levers on the annular seat, the ends of the upper levers on the lower outer side of the pressing component, and the ends of the upper and lower levers on the annular seat on the outer side of the rotating component are all embedded in the alternating long and short rotating grooves on the lower inner side of the inner top component.

[0025] In one optional embodiment, the upper end of the pressing member also has two pressing caps.

[0026] In one optional embodiment, the outer top component, inner top component, pressing component, rotating component, push rod, bottom cover, and connecting cover are all coaxially arranged.

[0027] The second objective of this utility model is to provide a water cup, including a cup body and a cup lid, wherein the cup body has a cup mouth; the cup lid is fixed with an inner plug structure as described in any one of the objectives of this utility model; the cup lid and the cup body are connected by screwing the connecting cap body to the cup mouth.

[0028] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0029] The inner plug structure of this utility model controls the opening and closing of the inner plug by pressing the opening and closing component, which causes the push rod to move horizontally within the guide hole. When there is a pressure difference between the inside and outside of the water cup, the bottom cover is held against the cup opening by the internal air pressure and is difficult to push open. At this time, the push rod drives the pressure relief end away from the pressure relief hole, opening the pressure relief channel to release pressure, so that the pressure inside and outside the water cup tends to be equal. Then, the bottom cover can be easily moved away from the water passage ring, opening the water passage and allowing the water to be poured out smoothly. The water passage ring and the connecting cover are connected by a break-point thread. The break-point thread provides space for liquid to pass through and is easy to disassemble. The bottom support component, which is frequently in direct contact with drinking water, can be removed for thorough cleaning to prevent the growth of bacteria. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the inner plug structure in Example 1;

[0031] Figure 2 This is a cross-sectional view of the inner plug structure of Example 1;

[0032] Figure 3 This is an exploded view of the inner plug structure of Example 1;

[0033] Figure 4 This is a schematic diagram showing the connection between the connecting cover and the base assembly of the inner plug structure in Embodiment 1;

[0034] Figure 5 This is an exploded view of the opening and closing assembly of the inner plug structure in Example 1;

[0035] Figure 6 This is an exploded view of the base assembly of the inner plug structure in Embodiment 1.

[0036] In the diagram: 10. Connecting cover; 11. Installation cavity; 12. Fastening groove; 20. Base support assembly; 21. Water-passing ring; 211. Water-passing hole; 212. Guide hole; 213. Skirt; 22. Push rod; 221. Braking end; 222. Rod body; 2221. Groove; 2222. Entering channel; 2223. Locking groove; 2224. Sealing channel; 223. Pressure relief end; 224. Limiting ring; 2 3. Bottom cover; 231. Pressure relief hole; 24. First elastic element; 30. Opening and closing assembly; 31. Outer top component; 32. Inner top component; 321. Rotating groove; 33. Pressing component; 331. Upper lever; 34. Rotating component; 341. Annular seat; 342. Lower lever; 35. Pressing cover; 41. First sealing ring; 42. Second sealing ring; 43. Third sealing ring; 50. Filter cartridge; 52. Fastening ring. Detailed Implementation

[0037] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments. Unless otherwise specified, the materials and equipment used in this embodiment are all commercially available. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0038] In the description of this application, it should be understood that the terms "upper," "lower," "front," "rear," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. In the description of this application, "a plurality of" means two or more, unless otherwise precisely specified.

[0039] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "connected," "linked," and "connected" should be interpreted broadly. For example, they can refer to a fixed connection, a connection through an intermediary, or a connection within two elements or an interaction between two elements. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0040] The terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such process, method, product, or apparatus.

[0041] Example 1:

[0042] Please refer to Figure 1-6 This embodiment provides an inner plug structure, including a connecting cover 10, and a bottom support assembly 20 and an opening and closing assembly 30 installed inside the connecting cover 10;

[0043] Specifically, the outer side of the connecting cover 10 is provided with threads for screwing into the body of the water cup, and the interior of the connecting cover 10 forms an installation cavity 11 for installing the bottom cover assembly and the opening and closing assembly 30.

[0044] The base support assembly 20 is installed at one end inside the mounting cavity 11. The base support assembly 20 includes a water-passing ring 21, a push rod 22, and a bottom cover 23. The water-passing ring 21 is connected to the end of the mounting cavity 11 by a discontinuous thread. The discontinuous thread is connected by non-continuous threaded connections at both ends, allowing liquid to pass through the discontinuity, as will be understood by those skilled in the art. The water-passing ring 21 has a plurality of water-passing holes 211 arranged in a circumferential annular array, thereby forming a water-passing channel between the water-passing ring 21 and the connecting cover 10, allowing liquid to pass through. A guide hole 212 is formed inside the water-passing ring 21.

[0045] The push rod 22 includes a rod body 222, with a braking end 221 and a pressure relief end 223 formed at both ends of the rod body 222. The rod body 222 passes through the guide hole 212, with both ends extending out of the guide hole 212. The braking end 221 is positioned above the pressure relief end 223 in the direction of gravity. A pressure relief hole 231 is formed on the bottom cover 23, through which the rod body 222 can pass. The pressure relief hole 231 and the rod body 222 are clearance-fitted, thereby forming a pressure relief channel for gas to pass through between the pressure relief hole 231 and the rod body.

[0046] The opening and closing assembly 30 is installed at the other end of the mounting cavity 11, and the opening and closing assembly 30 is used to push the push rod 22.

[0047] Based on the above structure, during use, pressing the opening and closing component 30 causes the push rod 22 to move horizontally within the guide hole 212. When there is a pressure difference between the inside and outside of the water cup, the bottom cover 23 is held against the cup opening and difficult to push open. At this time, the push rod 22 drives the pressure relief end 223 away from the pressure relief hole 231, opening the pressure relief channel to release pressure and making the pressure inside and outside the water cup more uniform. Then, the bottom cover 23 can be easily moved away from the water passage ring 21, opening the water passage and allowing water to be poured out smoothly. In this embodiment, the water passage ring 21 is connected to the connecting cover 10 by a break-point thread, providing space for liquid to pass through and facilitating disassembly. This allows the bottom support component 20, which is frequently in direct contact with drinking water, to be removed for thorough cleaning, preventing bacterial growth.

[0048] Furthermore, the brake end 221 of the push rod 22 is provided with a limiting ring 224; the water-passing ring 21 has a first limiting groove and a second limiting groove formed on opposite sides; and a third limiting groove is formed on the upper side of the bottom cover 23.

[0049] The base support assembly 20 also includes a first elastic element 24, which is sleeved on the rod body 222 of the push rod 22. One end of the first elastic element 24 is disposed in the first limiting groove, and the other end abuts against the limiting ring 224. The first elastic element 24 provides an elastic force that drives the push rod 22 to translate in the direction of the opening and closing assembly 30. In use, the water passage can be opened by pressing to overcome the elastic force of the first elastic element 24. After use, the first elastic element 24 can make the push rod 22 quickly return to the state of closing the water passage.

[0050] The base support assembly 20 also includes a second elastic element (not shown in the figure). The second elastic element is sleeved on the rod body 222 of the push rod 22. One end of the second elastic element is disposed in the second limiting groove, and the other end is disposed in the third limiting groove. The elastic force provided by the second elastic element presses the bottom cover 23 against the pressure relief end 223 of the push rod 22, sealing the pressure relief end 223 in the pressure relief hole 231, so that the pressure relief channel is normally kept closed. The second elastic element helps the bottom cover 23 to quickly reset after pressure relief is completed.

[0051] Specifically, a protrusion is formed inside the limiting ring 224;

[0052] The push rod 22 has a circumferentially formed locking groove 2223 on its braking end 221, and radially formed an entry channel 2222 and a closing channel 2224 on its braking end 221. One end of the entry channel 2222 is connected to the locking groove 2223, and the other end is an open opening. One end of the closing channel 2224 is connected to the locking groove 2223, and the other end is a closed opening. During installation, the protrusion in the limiting ring 224 is inserted into the locking groove 2223 through the open opening of the entry channel 2222, and after being twisted, it passes through the locking groove 2223 and enters the closing channel 2224. The elastic force of the first elastic element 24 restricts the protrusion in the limiting ring 224 to the closing channel 2224, thus fixing the limiting ring 224 to the braking end 221 of the push rod 22. The reverse operation technique during disassembly allows the limiting ring 224 to be easily removed, thereby disassembling the base assembly 20 into individual small parts for easy deep cleaning.

[0053] In this embodiment, the outer edge of the water-passing ring 21 is formed with a skirt 213; the rod body 222 of the push rod 22 is formed with a groove 2221 around its circumference;

[0054] The inner plug structure of this embodiment also includes a sealing assembly, which includes a first sealing ring 41, a second sealing ring 42, a third sealing ring 43 and a fourth sealing ring;

[0055] The first sealing ring 41 is sleeved on the surface of the skirt 213; by screwing the water-passing ring 21 to the connecting cover 10, one side of the first sealing ring 41 is pressed between the water-passing ring 21 and the connecting cover 10; when the water passage is closed, the first sealing ring 41 contacts the bottom cover 23, thereby forming a sealing surface between the first sealing ring 41 and the bottom cover 23.

[0056] The second sealing ring 42 is sleeved on the pressure relief end 223. When the pressure relief channel is closed, the second sealing ring 42 contacts the bottom cover 23 to form a sealing surface.

[0057] The third sealing ring 43 is sleeved in the groove 2221 of the push rod 22 body 222, and the outer side of the third sealing ring 43 contacts the guide hole 212, thereby forming a dynamic seal between the third sealing ring 43 and the inner wall of the guide hole 212.

[0058] The fourth sealing ring is sleeved on the outside of the connecting cover 10, and forms a sealing surface with the inside of the cup opening through the fourth sealing ring.

[0059] Furthermore, a fastening groove 12 is formed on the outer side of the connecting cover 10; it also includes a filter cartridge 50, the surface of which has a plurality of filter holes, and a fastening ring 52 is formed on the upper edge of the filter cartridge 50. The filter cartridge 50 is connected to the connecting cover 10 by the fastening ring 52 engaging with the fastening groove 12. By setting the filter cartridge 50, a separation function is achieved, thus achieving the effect of solid-liquid separation within the cup.

[0060] The opening and closing assembly 30 in this embodiment includes an outer top component 31, an inner top component 32, a pressing component 33, and a rotating component 34.

[0061] The outer top component 31 is screwed to the water-passing ring 21 at its end. The inner top component 32 is embedded inside the outer top component 31. The rotating component 34 is installed at the lower part of the pressing component 33. The rotating component 34 and the pressing component 33 are embedded inside the inner top component 32 as a whole. By applying pressure to the pressing component 33, the rotating component 34 slides inside the inner top component 32, pushing the push rod 22 to move horizontally in the guide hole 212, thereby opening the water-passing channel and the pressure relief channel.

[0062] The inner top component 32 has alternating long and short rotating grooves 321 on its lower inner side; the pressing component 33 has upper levers 331 equidistantly distributed on its lower outer side, and the pressing component 33 has teeth at its bottom; the rotating component 34 has an annular seat 341 on its lower outer side, and lower levers 342 equidistantly distributed on the annular seat 341; the teeth at the bottom of the pressing component 33 are engaged with the outer side of the rotating component 34; the tops of the lower levers 342 equidistantly distributed on the annular seat 341; the ends of the upper levers 331 on the lower outer side of the pressing component 33; and the ends of the upper and lower levers 342 on the annular seat 341 on the outer side of the rotating component 34 are all embedded in the alternating long and short rotating grooves 321 on the lower inner side of the inner top component 32.

[0063] The upper end of the pressing component 33 also has two pressing caps 35.

[0064] By applying pressure to the pressing cover 35, the pressing member 33 slides downward. The upper lever 331 and the lower lever 342 engage with each other, causing the rotating member 34 to rotate by one tooth angle during the downward translation process. The rotating member 34 then engages with the rotating grooves 321 of alternating lengths on the lower inner side of the inner top member 32, thereby suspending the base support assembly 20 alternately in the open or closed state for easy use.

[0065] In this embodiment, the outer top component 31, inner top component 32, pressing component 33, rotating component 34, push rod 22, bottom cover 23 and connecting cover 10 are all coaxially arranged, saving space and making them aesthetically pleasing and portable.

[0066] Example 2:

[0067] This embodiment provides a water cup based on embodiment 1, including a cup body and a cup lid. The cup body has a cup mouth. The cup lid is fixed with the inner plug structure described in embodiment 1. The cup lid is connected to the cup body by screwing the connecting cover 10 to the cup mouth.

[0068] Although only certain components and embodiments of this application have been illustrated and described, many modifications and alterations (e.g., variations in the size, dimensions, structure, shape and proportion of the various elements, installation arrangement, material use, color, orientation, etc.) will be conceived by those skilled in the art without actually departing from the scope and spirit of the claims.

[0069] Finally, it should be noted that the above embodiments are only preferred embodiments of this utility model and should not be used to limit the scope of protection of this utility model. Any non-substantial changes and substitutions made by those skilled in the art based on this utility model shall fall within the scope of protection claimed by this utility model.

Claims

1. An inner plug structure, characterized in that, Includes the connecting cover, base assembly, and opening / closing assembly; The outer side of the connecting cover is used to connect with the body of the water cup, and an installation cavity is formed inside. The installation cavity is used to install the bottom cover assembly and the opening and closing assembly. The base support assembly is installed at one end of the mounting cavity. The base support assembly includes a water-passing ring, a push rod, and a bottom cover. The water-passing ring is connected to the end of the mounting cavity via a broken thread. The water-passing ring has several water-passing holes formed circumferentially, thereby forming a water-passing channel between the water-passing ring and the connecting cover for liquid to pass through. A guide hole is formed inside the water-passing ring. The push rod includes a rod body, with a braking end and a pressure relief end formed at both ends of the rod body, and the rod body passes through the guide hole. A pressure relief hole is formed on the bottom cover, through which the rod body passes, thereby forming a pressure relief channel between the pressure relief hole and the rod body. The opening and closing assembly is installed at the other end of the installation cavity. The opening and closing assembly is used to push the push rod, thereby causing the push rod to move horizontally in the guide hole, driving the pressure relief end away from the pressure relief hole, opening the pressure relief channel, and driving the bottom cover away from the water ring, opening the water passage channel.

2. The inner plug structure according to claim 1, characterized in that, The brake end of the push rod is provided with a limit ring; the two opposite sides of the water-passing ring are respectively provided with a first limit groove and a second limit groove; a third limit groove is provided on the upper side of the bottom cover; The base support assembly also includes a first elastic element, which is sleeved on the body of the push rod. One end of the first elastic element is disposed in the first limiting groove, and the other end abuts against the limiting ring. The first elastic element provides an elastic force that drives the push rod to translate in the direction of the opening and closing assembly. The base support assembly also includes a second elastic element, which is sleeved on the body of the push rod. One end of the second elastic element is disposed in the second limiting groove, and the other end is disposed in the third limiting groove. The elastic force provided by the second elastic element presses the bottom cover against the pressure relief end of the push rod, sealing the pressure relief end in the pressure relief hole, so that the pressure relief channel is normally kept closed.

3. The inner plug structure according to claim 2, characterized in that, A protrusion is formed inside the limiting ring; The push rod braking end has a circumferentially formed locking groove, and the push rod braking end has a radially opened entry channel and a closing channel. One end of the entry channel is connected to the locking groove, and the other end is an open opening. One end of the closing channel is connected to the locking groove, and the other end is a closed opening. The protrusion in the limiting ring enters the locking groove from the open opening of the entry channel, and then enters the closing channel after passing through the locking groove. The elastic force of the first elastic element restricts the protrusion in the limiting ring to the closing channel, thus fixing the limiting ring to the braking end of the push rod.

4. The inner plug structure according to claim 1, characterized in that, The outer edge of the water-passing ring is formed with a skirt; the push rod has a groove formed around its circumference. It also includes a sealing assembly, which includes a first sealing ring, a second sealing ring and a third sealing ring; The first sealing ring is fitted onto the skirt surface; by screwing the water-passing ring to the connecting cover, one side of the first sealing ring is pressed between the water-passing ring and the connecting cover; when the water-passing channel is closed, the first sealing ring contacts the bottom cover, thereby forming a sealing surface between the first sealing ring and the bottom cover; The second sealing ring is fitted onto the pressure relief end. When the pressure relief channel is closed, the second sealing ring contacts the bottom cover to form a sealing surface. The third sealing ring is fitted inside the groove of the push rod body, and the outer side of the third sealing ring contacts the guide hole, thereby forming a dynamic seal between the third sealing ring and the inner wall of the guide hole.

5. The inner plug structure according to claim 1, characterized in that, A fastening groove is formed on the outer side of the connecting cover; It also includes a filter cartridge with several filter holes on its surface and a fastening ring formed on the upper edge of the filter cartridge. The filter cartridge is connected to the connecting cover by the fastening ring engaging with the fastening groove.

6. The inner plug structure according to claim 1, characterized in that, The opening and closing assembly includes an outer top component, an inner top component, a pressing component, and a rotating component; The outer top component is screwed to the water-passing ring at its end. The inner top component is embedded inside the outer top component. The rotating component is installed at the lower part of the pressing component. The rotating component and the pressing component are embedded inside the inner top component as a whole. By applying pressure to the pressing component, the rotating component slides inside the inner top component, pushing the push rod to move horizontally in the guide hole, thereby opening the water-passing channel and the pressure relief channel.

7. The inner plug structure according to claim 6, characterized in that, The inner top component has alternating long and short rotating grooves on its lower inner side; the pressing component has upper levers evenly distributed on its lower outer side, and the pressing component has teeth at its bottom; the rotating component has an annular seat on its lower outer side, and lower levers are evenly distributed on the annular seat; the teeth at the bottom of the pressing component are engaged with the outer side of the rotating component; the tops of the lower levers evenly distributed on the annular seat, the ends of the upper levers on the lower outer side of the pressing component, and the ends of the upper and lower levers on the annular seat on the outer side of the rotating component are all embedded in the alternating long and short rotating grooves on the lower inner side of the inner top component.

8. The inner plug structure according to claim 7, characterized in that, The upper end of the pressing component also has two pressing caps.

9. The inner plug structure according to claim 7, characterized in that, The outer top component, inner top component, pressing component, rotating component, push rod, bottom cover, and connecting cover are all coaxially arranged.

10. A water cup, characterized in that, The cup includes a cup body and a cup lid, the cup body having a cup mouth; the cup lid is fixed with an inner plug structure as described in any one of claims 1-9; the cup lid and the cup body are connected by screwing the connecting cap body to the cup mouth.

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