Cup cover of straw water cup

Abstract

The utility model provides a straw water cup cover which comprises an upper cover body and a lower cover body, and a water outlet pipeline is arranged in the upper cover body. The lower cover body is detachably connected with the upper cover body, a straw sleeve is arranged on the lower cover body, the straw sleeve is provided with a near end communicated with the water outlet pipeline and a far end extending into the water cup, the straw sleeve is provided with a cavity, and a filtering piece used for filtering and purifying water is arranged in the cavity; the filter part comprises a permeable wall and a central pipeline, the central pipeline is communicated with the water outlet pipeline, a sealing assembly is arranged at the bottom end of the central pipeline, the sealing assembly is provided with a sealing column, the sealing column is used for sealing the central pipeline, the sealing assembly further comprises a plurality of flow guide channels distributed around the sealing column, and the flow guide channels are communicated with the cavity; liquid flows into the suction pipe sleeve from the far end, then flows into the cavity through the flow guide channel, is filtered through the permeable wall and then is output from the central pipeline to the water outlet pipeline.

Description

Technical Field

[0001] This utility model relates to the field of cup lids, and in particular to a straw cup lid. Background Technology

[0002] As people become increasingly health-conscious, their demands for drinking water safety and quality are also becoming more stringent. Traditional drinking utensils, such as ordinary water cups and straw cups, are primarily designed for convenience and aesthetics, while neglecting water filtration and purification. In particular, water cups with straws have simple internal structures, making them prone to allowing impurities, suspended particles, or microorganisms from the water to enter the cup, thus affecting the health and safety of drinking water.

[0003] Therefore, it is necessary to propose a new type of cup lid that is simple in structure, easy to operate, and has efficient filtration performance and reliable sealing function. Utility Model Content

[0004] In order to overcome the shortcomings of the existing technology, this utility model provides a straw cup lid, which has a simple structure, is easy to operate, and has efficient filtration performance and reliable sealing function.

[0005] The technical solution adopted by this utility model to solve its technical problem is:

[0006] This utility model provides a straw cup lid, including an upper cover body, in which a water outlet pipe is provided;

[0007] The lower cover is detachably connected to the upper cover, and a straw sleeve is provided on the lower cover. The straw sleeve has a proximal end that communicates with the water outlet pipe and a distal end that extends into the interior of the water cup. The straw sleeve has a cavity, and a filter element for filtering and purifying water is provided in the cavity.

[0008] The filter element includes a permeable wall and a central pipe, the central pipe being connected to the outlet pipe, and a sealing assembly being provided at the bottom end of the central pipe. The sealing assembly has a sealing column for sealing the central pipe, and the sealing assembly also includes a plurality of flow guiding channels distributed around the sealing column, the flow guiding channels being connected to the cavity.

[0009] The liquid flows from the distal end into the suction tube sleeve, then through the guide channel into the cavity, and after being filtered by the permeable wall, it is output from the central pipe to the outlet pipe.

[0010] As an improvement of this utility model, the sealing column is a hollow sealing column, and a plurality of sealing strips are provided on the outer side wall of the sealing column. The sealing column is disposed inside the central pipe and is sealed and clamped by the sealing strips.

[0011] As an improvement of this utility model, the sealing assembly includes an annular cover, the outer wall of the annular cover abutting against the inner wall of the cavity, the sealing post being fixedly disposed at the axial center of the annular cover, and the sealing assembly further includes a plurality of partition strips, the partition strips being circumferentially spaced between the annular cover and the sealing post, and the two ends of the partition strips being fixedly connected to the inner circumferential wall of the annular cover and the outer circumferential wall of the sealing post, respectively, and the flow guiding channel being formed between two adjacent radial partition strips.

[0012] As an improvement to this utility model, the sealing component is a soft rubber sealing component.

[0013] As an improvement of this utility model, a number of snap-fit ​​strips are provided on the bottom end of the inner wall of the water outlet pipe, and the filter element is connected to the bottom of the water outlet pipe through the snap-fit ​​strips.

[0014] As an improvement to this utility model, the filter element is a carbon rod filter element, a ceramic filter element, an ion exchange resin filter element, or a silver ion filter element.

[0015] As an improvement of this utility model, the straw sleeve has a water inlet pipe that communicates with the cavity. A first mounting base is provided at the connection between the water inlet pipe and the cavity. A first one-way air valve is provided on the first mounting base to prevent backflow of liquid in the cavity.

[0016] As an improvement of this utility model, the lower cover has a mounting cavity, a second mounting base is provided in the mounting cavity, and a second one-way air valve is provided on the second mounting base to prevent the liquid in the water cup from flowing back.

[0017] As an improvement of this utility model, the lower cover is a plastic lower cover and the upper cover is a plastic upper cover. The inner wall of the upper cover is provided with a first connecting part, and the outer wall of the lower cover is provided with a second connecting part. The first connecting part is connected to the second connecting part, so that the upper cover and the lower cover are detachably connected.

[0018] As an improvement of this utility model, a straw cap is detachably connected to the water outlet pipe. The straw cap includes a fixing ring, a cap body, and a connector connecting the fixing ring and the cap body. An installation groove is provided on the outer wall of the water outlet pipe, and the fixing ring is disposed in the installation groove to connect the straw cap to the water outlet pipe. The cap body covers the top of the water outlet pipe to seal the water outlet pipe. A protrusion is provided on the inner wall of the water outlet pipe, and the cap body has a sealing plug. A groove is provided on the outer side of the sealing plug, and the protrusion and the groove cooperate to seal the water outlet pipe.

[0019] The beneficial effects of this utility model are as follows: A straw cup lid includes an upper lid and a lower lid. The upper lid has a water outlet pipe. The lower lid is detachably connected to the upper lid and has a straw sleeve. The straw sleeve has a proximal end communicating with the water outlet pipe and a distal end extending into the cup. The straw sleeve has a cavity, within which a filter element for filtering and purifying water is installed. The filter element includes a permeable wall and a central pipe communicating with the water outlet pipe. A sealing component is located at the bottom of the central pipe. The sealing component has a sealing post for sealing the central pipe. The sealing component also includes several guide channels distributed around the sealing post, which communicate with the cavity. Liquid flows from the distal end into the straw sleeve and then into the cavity through the guide channels. After being filtered by the permeable wall, it is output from the central pipe to the water outlet pipe. The detachable connection between the lower and upper lid facilitates assembly, disassembly, and cleaning. Furthermore, the liquid in the cup flows out through a predetermined path, ensuring efficient purification of the fluid during transmission. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the following description of the embodiments will be briefly introduced. The drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0022] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0023] Figure 2 This is a cross-sectional structural schematic diagram of the present invention;

[0024] Figure 3 This is a schematic diagram of the sealing component in this utility model;

[0025] Figure 4 This is a schematic diagram of the cross-sectional structure of the upper cover;

[0026] Figure 5 This is a structural schematic diagram of the first mounting base;

[0027] Figure 6 This is a schematic diagram of the structure of the first one-way air valve;

[0028] Figure 7 This is a schematic diagram of the structure of the second mounting base;

[0029] Figure 8 This is a schematic diagram of the second one-way valve.

[0030] In the picture:

[0031] 100. Cup lid;

[0032] 1000, Top cover; 1001, Water outlet pipe; 1002, Clip-on strip; 1003, First connecting part; 1004, Mounting groove; 1005, Protrusion;

[0033] 2000, Lower cover; 2001, Straw sleeve; 2002, Proximal end; 2003, Distal end; 2004, Cavity; 2005, Water inlet pipe; 2101, First mounting base; 2102, First one-way air valve; 2103, First mounting hole; 2104, Connecting port; 2105, First mounting shaft; 2106, First elastic valve plate; 2107, First stop part; 2006, Mounting cavity; 2201, Second mounting base; 2202, Second one-way air valve; 2203, Second mounting hole; 2204, Vent; 2205, Second mounting shaft; 2206, Second elastic valve plate; 2207, Second stop part; 2207, Second connecting part;

[0034] 3000, Filter element; 3001, Permeable wall; 3002, Central conduit; 3003, Sealing assembly; 3101, Sealing column; 3102, Flow guide channel; 3103, Sealing strip; 3104, Annular cover; 3105, Separator strip;

[0035] 4000, straw cap; 4001, retaining ring; 4002, cap body; 4003, connector; 4004, sealing plug; 4005, groove. Detailed Implementation

[0036] refer to Figures 1 to 8This utility model provides a straw cup lid 100, including an upper lid 1000 and a lower lid 2000. The upper lid 1000 has a water outlet pipe 1001. The lower lid 2000 is detachably connected to the upper lid 1000 and has a straw sleeve 2001. The straw sleeve 2001 has a proximal end 2002 communicating with the water outlet pipe 1001 and a distal end 2003 extending into the cup. The straw sleeve 2001 has a cavity 2004, within which a filter element 3000 for filtering and purifying water is disposed. The filter element 3000 includes a permeable wall 3001 and a central pipe 3000. 02. The central pipe 3002 is connected to the outlet pipe 1001. A sealing assembly 3003 is provided at the bottom end of the central pipe 3002. The sealing assembly 3003 has a sealing column 3101, which is used to seal the central pipe 3002. The sealing assembly 3003 also includes several guide channels 3102 distributed around the sealing column 3101. The guide channels 3102 are connected to the cavity 2004. Liquid flows from the distal end 2003 into the straw sleeve 2001 and then flows into the cavity 2004 through the guide channels 3102. After being filtered by the permeation wall 3001, it is output from the central pipe 3002 to the outlet pipe 1001. The permeation wall 3001 performs preliminary filtration on the liquid entering the cavity 2004 of the straw sleeve 2001, effectively intercepting impurities and pollutants in the water. Furthermore, the sealing column 3101 effectively prevents unfiltered water from flowing out of the central pipe 3002 to the outlet pipe 1001.

[0037] In other embodiments, a straw may be connected to the bottom of the straw sleeve 2001 for the convenience of the user to drink water.

[0038] In this embodiment, refer to Figure 3 As shown, the sealing column 3101 is a hollow sealing column, and several sealing strips 3103 are provided on the outer wall of the sealing column 3101. The sealing column 3101 is placed inside the central pipe 3002 and is sealed and secured by the sealing strips 3103. The hollow sealing column 3101 not only effectively reduces material usage and weight, but also allows the multiple sealing strips 3103 on the outer wall of the sealing column 3101 to achieve multi-point and multi-layer contact sealing, giving it a better sealing effect and effectively preventing the phenomenon of unfiltered liquid flowing directly out of the central pipe 3002.

[0039] In this embodiment, the sealing assembly 3003 includes an annular cover 3104, the outer wall of which abuts against the inner wall of the cavity 2004. A sealing post 3101 is fixedly disposed at the axial center of the annular cover 3104. The sealing assembly 3003 also includes several partition strips 3105, which are circumferentially spaced between the annular cover 3104 and the sealing post 3101. The two ends of each partition strip 3105 are fixedly connected to the inner circumferential wall of the annular cover 3104 and the outer circumferential wall of the sealing post 3101, respectively. A flow channel 3102 is formed between two adjacent radial partition strips 3105. This structure provides a clear flow path for the fluid, effectively guiding the medium through the assembly and preventing turbulence. Furthermore, the fixed connection between the partition strips 3105 and the annular cover 3104 and the sealing post 3101 provides lateral and longitudinal mechanical support, ensuring the entire assembly remains stable during operation and is not easily affected by vibration or external impact.

[0040] In this embodiment, the sealing component 3003 is a soft rubber sealing component 3003. The soft rubber material has good flexibility and elasticity, which can achieve a tight fit, thereby effectively filling any tiny gaps that may exist at the connection point, improving the overall sealing effect. Furthermore, the soft rubber can adaptively adjust under pressure, further enhancing the sealing capability in dynamic environments and helping to prevent liquid leakage.

[0041] In this embodiment, a plurality of snap-fit ​​strips 1002 are provided on the bottom end of the inner wall of the water outlet pipe 1001, and the filter element 3000 is connected to the bottom of the water outlet pipe 1001 through the snap-fit ​​strips 1002. Through the above structure, a stable connection between the filter element 3000 and the inner wall of the water outlet pipe 1001 is achieved, effectively preventing the filter element 3000 from being displaced due to vibration or fluid impact, and ensuring the long-term stability of the filter element 3000.

[0042] In this embodiment, the filter element 3000 is a carbon rod filter element 3000. The carbon rod filter element 3000 uses activated carbon as the main material, which has an extremely high specific surface area and adsorption capacity. It can effectively remove impurities such as residual chlorine, odors, and organic pollutants from the water, improving the taste and safety of the water. Furthermore, the microporous structure of activated carbon can trap smaller particles while avoiding obstructing the flow of water, thus balancing filtration efficiency and flow rate. In addition, the carbon rod filter element 3000 has a relatively small size, making it very suitable for use in portable devices such as water cups without adding extra space.

[0043] In other embodiments, the filter element 3000 is a ceramic filter element 3000, whose microporous structure effectively filters suspended particles and bacteria in water, and is suitable for high-temperature or corrosive environments. The ceramic filter element 3000 has a long service life and can be reused after cleaning. Alternatively, the filter element 3000 can also be an ion exchange resin filter element 3000, used to remove hardness ions such as calcium and magnesium ions from water, reducing water hardness and preventing scale formation. The filter element 3000 can also be a silver ion filter element 3000, which has significant antibacterial and bacteriostatic functions, keeping filtered water from easily breeding bacteria for extended periods. This type of filter element 3000 is suitable for drinking water devices with long-term storage, ensuring water quality hygiene.

[0044] In this embodiment, refer to Figures 5-6 The straw sleeve 2001 has a water inlet pipe 2005, which is connected to the cavity 2004. A first mounting base 2101 is provided at the connection between the water inlet pipe 2005 and the cavity 2004. A first one-way valve 2102 is provided on the first mounting base 2101. The first one-way valve 2102 is used to prevent the liquid in the cavity 2004 from flowing back, thereby avoiding internal contamination or system damage caused by backflow. The first one-way valve 2102 is a soft rubber one-way valve.

[0045] Specifically, the first mounting base 2101 includes a first mounting hole 2103 and a plurality of connecting ports 2104 circumferentially distributed in the mounting hole. The first one-way valve 2102 includes a first mounting shaft 2105 and a first elastic valve plate 2106 fixedly connected to the first mounting shaft 2105. The first mounting shaft 2105 is installed in the first mounting hole 2103, and the first elastic valve plate 2106 is used to open or close the connecting ports 2104. Specifically, when the user sucks water, a pressure difference is generated inside the cavity 2004 and outside. At this time, the first elastic valve plate 2106 deforms, opening the connection port 2104, allowing the liquid in the cup to enter the cavity 2004 through the water inlet pipe 2005. When the user stops sucking water, the first elastic valve plate 2106 returns to its original position, closing the connection port 2104 to prevent the filtered liquid from flowing back into the cup. At the same time, the liquid that has not been sucked out is stored in the straw sleeve 2001, thereby reducing the amount of air that needs to be sucked out of the mouthpiece when drinking water, so as to make it easy to drink water with the mouthpiece.

[0046] In this embodiment, a first stop 2107 is also provided on the first mounting shaft 2105. The first stop 2107 is used to fix the first mounting shaft 2105 in the first mounting hole 2103 and seal the first mounting hole 2103 to prevent liquid from leaking from the first mounting hole 2103 and damaging the first one-way valve 2102.

[0047] In this embodiment, refer to Figures 7-8The lower cover 2000 has a mounting cavity 2006, and a second mounting base 2201 is provided in the mounting cavity 2006. A second one-way valve 2202 is installed on the second mounting base 2201. The second one-way valve 2202 is used to prevent the liquid in the water cup from flowing back. The second one-way valve 2202 is a soft rubber one-way valve.

[0048] Specifically, the second mounting base 2201 includes a second mounting hole 2203 and a plurality of vents 2204 circumferentially distributed in the mounting hole. The second one-way valve 2202 includes a second mounting shaft 2205 and a second elastic valve plate 2206 fixedly connected to the second mounting shaft 2205. The second mounting shaft 2205 is installed in the second mounting hole 2203, and the second elastic valve plate 2206 covers the vents 2204, keeping the vents 2204 in a closed state.

[0049] In this embodiment, the first one-way valve 2102 and the second one-way valve 2202 are arranged in opposite directions, and the elastic valve plates 2106 and 2206 have opposite deformation directions. When the second one-way valve 2202 is stationary and not drawing water, the second elastic valve plate 2206 covers the vent 2204, keeping the vent 2204 closed to prevent backflow of liquid in the cup. When the user draws water, the pressure inside the cup decreases, and the second elastic valve plate 2206 still closes the vent 2204, ensuring that liquid only enters the cavity 2004 through the first valve, thus avoiding backflow of liquid in the cup.

[0050] In this embodiment, a second stop 2207 is also provided on the second mounting shaft 2205. The second stop 2207 is used to fix the second mounting shaft 2205 in the second mounting hole 2203 and seal the second mounting hole 2203 to prevent liquid from leaking from the second mounting hole 2203 and damaging the second one-way valve 2202.

[0051] With the above structure, the liquid can only enter the cavity 2004 from the inlet pipe 2005. After being evenly distributed in the cavity 2004 through the guide channel 3102, it comes into full contact with the permeable wall 3001 of the filter element 3000. The filtered liquid is then transported to the outlet pipe 1001 through the central pipe 3002, thus isolating the filtered liquid from the unfiltered liquid. This not only ensures the hygiene of the filtration process but also optimizes the user experience.

[0052] In this embodiment, the lower cover 2000 is a plastic lower cover 2000, and the upper cover 1000 is a plastic upper cover 1000. Plastic material is lightweight and high-strength, reducing the overall weight of the component and making it easier for users to carry. At the same time, plastic material has relatively low cost, making it suitable for mass production and further reducing manufacturing costs.

[0053] In this embodiment, refer to Figure 2 As shown, the inner wall of the upper cover 1000 is provided with a first connecting part 1003, and the outer wall of the lower cover 2000 is provided with a second connecting part 2007. The first connecting part 1003 and the second connecting part 2007 are connected, allowing the upper cover 1000 and the lower cover 2000 to be detachably connected. Specifically, the first connecting part 1003 has an internal thread, and the second connecting part 2007 has an external thread. The first connecting part 1003 and the second connecting part 2007 are connected by threads, allowing the upper cover 1000 and the lower cover 2000 to be detachably connected. After the internal and external threads are engaged, the upper cover 1000 and the lower cover 2000 can achieve precise and firm positioning, ensuring stability even during long-term use or when subjected to external impact. In addition, the tight fit of the threaded connection helps to form a good sealing surface, reducing the risk of liquid leakage and intrusion of external contaminants, thereby improving the overall sealing performance of the system.

[0054] In this embodiment, refer to Figure 4 A straw cap 4000 is detachably connected to the water outlet pipe 1001. The straw cap 4000 includes a retaining ring 4001, a cap body 4002, and a connector 4003 connecting the retaining ring 4001 and the cap body 4002. An installation groove 1004 is provided on the outer wall of the water outlet pipe 1001. The retaining ring 4001 is disposed in the installation groove 1004 to connect the straw cap 4000 to the water outlet pipe 1001. The cap body 4002 is placed on the top of the water outlet pipe 1001 to seal the water outlet pipe 1001. The retaining ring 4001 in the installation groove 1004 ensures a firm connection of the straw cap 4000 to the water outlet pipe 1001, preventing accidental loosening or detachment due to collisions or vibrations during daily use.

[0055] In this embodiment, a protrusion 1005 is provided on the inner wall surface of the water outlet pipe 1001, and the cap body 4002 has a sealing plug 4004. A groove 4005 is provided on the outer side of the sealing plug 4004. The protrusion 1005 and the groove 4005 cooperate to seal the water outlet pipe 1001. Through the above structure, efficient sealing is achieved, avoiding liquid leakage during the water inlet and outlet process, and ensuring the hygiene of the product water quality.

[0056] The above description provides one or more embodiments in conjunction with specific content, but it is not intended that the specific implementation of this utility model is limited to these descriptions. Any methods or structures that are similar to or identical to those of this utility model, or any technical deductions or substitutions made based on the concept of this utility model, should be considered within the scope of protection of this utility model.

Claims

1. A straw cup lid (100), characterized in that, The utility model relates to a drinking cup, including Upper cover body (1000), be provided with outlet water pipeline (1001) in the upper cover body (1000); Lower cover body (2000), the lower cover body (2000) with upper cover body (1000) is detachable connection, and the lower cover body (2000) is provided with suction tube cover (2001), the suction tube cover (2001) has proximal end (2002) with outlet water pipeline (1001) intercommunication and the distal end (2003) extending to the inside of water cup, the suction tube cover (2001) has cavity (2004), is provided with filter piece (3000) for filtering water quality in the cavity (2004); The filter piece (3000) includes permeable wall (3001) and center pipeline (3002), the center pipeline (3002) with outlet water pipeline (1001) intercommunication, the bottom end of center pipeline (3002) is provided with sealing assembly (3003), the sealing assembly (3003) has sealing column (3101), the sealing column (3101) is used to seal center pipeline (3002), the sealing assembly (3003) still includes several flow guide channels (3102) around sealing column (3101) distribution, the flow guide channels (3102) with cavity (2004) intercommunication; Wherein, liquid flows into suction tube cover (2001) from the distal end (2003), and then via flow guide channels (3102) into cavity (2004), filters after permeable wall (3001), and exports from center pipeline (3002) to outlet water pipeline (1001).

2. The straw cup lid (100) according to claim 1, characterized in that The sealing column (3101) is hollow sealing column (3101), and the outer side wall of sealing column (3101) is provided with several sealing strips (3103), the sealing column (3101) is arranged in center pipeline (3002), and is sealed clamped by sealing strip (3103).

3. The straw cup lid (100) of claim 2, wherein, The sealing assembly (3003) includes annular cover body (3104), the outer wall surface of annular cover body (3104) is in abutment with the inner wall surface of cavity (2004), the sealing column (3101) is fixedly arranged at the axial position of annular cover body (3104), the sealing assembly (3003) still includes several partition strips (3105), the partition strips (3105) are spaced apart distribution between annular cover body (3104) and sealing column (3101) along the circumference, and the two ends of partition strip (3105) are respectively fixedly connected with the inner peripheral wall of annular cover body (3104) and the outer peripheral wall of sealing column (3101), and the flow guide channel (3102) is formed between adjacent two partition strips (3105).

4. The straw cup lid (100) of claim 3, wherein, The sealing assembly (3003) is soft rubber sealing assembly (3003).

5. The straw cup lid (100) of claim 1, wherein, The bottom end of the inner wall surface of outlet water pipeline (1001) is provided with several clamping strips (1002), and the filter piece (3000) is connected at the bottom of outlet water pipeline (1001) by clamping strip (1002).

6. The straw cup lid (100) of claim 1, wherein, The filter (3000) is a carbon rod filter, a ceramic filter, an ion exchange resin filter or a silver ion filter.

7. The straw cup lid (100) of claim 1, wherein, The straw sleeve (2001) has a water inlet pipe (2005) in communication with the cavity (2004), and a first mounting base (2101) is arranged at the position where the water inlet pipe (2005) is in communication with the cavity (2004), and a first one-way air valve (2102) is arranged on the first mounting base (2101), which prevents the liquid in the cavity (2004) from flowing backward.

8. The straw cup lid (100) of claim 1, wherein, The lower cover body (2000) has a mounting cavity (2006) on it, and a second mounting base (2201) is arranged in the mounting cavity (2006), and a second one-way air valve (2202) is arranged on the second mounting base (2201), which prevents the liquid in the water cup from flowing backward.

9. The straw cup lid (100) of claim 1, wherein, The lower cover body (2000) is a plastic lower cover body (2000), and the upper cover body (1000) is a plastic upper cover body (1000), wherein the inner wall surface of the upper cover body (1000) is provided with a first connecting part (1003), the outer wall surface of the lower cover body (2000) is provided with a second connecting part (2007), and the first connecting part (1003) and the second connecting part (2007) are connected, so that the upper cover body (1000) and the lower cover body (2000) can be detachably connected.

10. The straw cup lid (100) of claim 1, wherein, The water outlet pipe (1001) is detachably connected with a straw cap (4000), the straw cap (4000) comprises a fixing ring (4001), a cap body (4002) and a connecting piece (4003) connecting the fixing ring (4001) and the cap body (4002), an installation groove (1004) is arranged on the outer side wall of the water outlet pipe (1001), the fixing ring (4001) is arranged in the installation groove (1004), so that the straw cap (4000) is connected with the water outlet pipe (1001), the cap body (4002) is arranged on the top end of the water outlet pipe (1001) to seal the water outlet pipe (1001), a protrusion (1005) is arranged on the inner wall surface of the water outlet pipe (1001), the cap body (4002) has a sealing plug (4004), the outer side of the sealing plug (4004) is provided with a groove (4005), and the protrusion (1005) and the groove (4005) cooperate to seal the water outlet pipe (1001).

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