An overflow-proof coupler

Abstract

This utility model belongs to the field of coupler technology, and particularly relates to an overflow-proof coupler. The lower connecting seat is elastically mounted with a water inlet pipe via a first spring, and the lower end is fixedly connected to the internal mounting cavity of the lower connecting seat. The upper connecting seat is equipped with a water outlet pipe that cooperates with the water inlet pipe. The first spring enables the water inlet pipe to have height compensation capability. During the coupling insertion and removal process between the upper and lower connecting seats, this structure effectively solves the suspension problem. A sealing component is provided between the water inlet pipe and the water outlet pipe. The sealing component can prevent water leakage when the upper connecting seat is inserted and removed from the lower connecting seat. A sliding rod slides vertically inside the water inlet pipe, and its top abuts against the sealing component. A leak-proof block is fixedly connected to the side wall of the sliding rod and is adapted to the water outlet port of the water inlet pipe to seal the water outlet port. The leak-proof block can be made of elastic material such as rubber. A second spring is provided on the sliding rod, and its elasticity can drive the sliding rod to move the leak-proof block to seal the water outlet port of the water inlet pipe.

Description

Technical Field

[0001] This utility model belongs to the field of coupler technology, and in particular relates to a coupler that prevents water overflow. Background Technology

[0002] In daily life, small household appliances such as electric kettles and health pots are widely used by consumers because they boil water quickly and conveniently. Automatic water-filling appliances are even more popular with consumers because of their unique water dispensing method. The water filling device is a conduit that passes through the middle of the appliance coupler and is an important component for guiding liquid to the kettle. Existing upper couplers may be misaligned due to being suspended, which will further damage the fitting accuracy of the sealing components. Moreover, the existing water inlet pipe structure is mostly a split structure, which is not only cumbersome to assemble, but also poses a risk of water overflow. Utility Model Content

[0003] The purpose of this invention is to provide an overflow-proof coupler to address the aforementioned technical problems, thereby solving the issues raised in the background section.

[0004] In view of this, the present invention provides a water-proof coupler, including an upper connecting seat and a lower connecting seat;

[0005] The water inlet pipe and the water outlet pipe are connected by a lower connecting seat that is elastically mounted with a first spring, and an upper connecting seat that is fitted with the water inlet pipe.

[0006] A sealing assembly is provided between the inlet pipe and the outlet pipe;

[0007] A sliding rod is vertically slidable inside the water inlet pipe, and its top abuts against the sealing assembly;

[0008] Leak-proof block: A leak-proof block is fixedly connected to the side wall of the slide rod, and it is adapted to the water outlet port of the water inlet pipe to seal the water outlet port.

[0009] The second spring is installed on the slide rod. Its elastic force can drive the slide rod to move the anti-leakage block to seal the water outlet of the water inlet pipe.

[0010] In the above technical solution, a limiting plate is fixedly provided on the side wall of the slide rod, the limiting plate slides inside the water inlet pipe, a limiting cylinder is fixedly provided at the lower end of the inside of the water inlet pipe, the slide rod is slidably connected to the limiting cylinder, and a second spring is provided between the limiting plate and the limiting cylinder.

[0011] In the above technical solution, the sealing component further includes:

[0012] A sealing sleeve is installed at the lower end of the water outlet pipe;

[0013] A sealing element is installed inside the water outlet pipe to seal with the sealing sleeve;

[0014] An opening groove is formed on the inner wall of the sealing sleeve at one end near the lower connecting seat;

[0015] A sealing ring is fixedly connected to the end of the open groove;

[0016] A reducer is fixedly connected to the top of the inlet pipe. The opening groove is used for inserting the reducer, and the side wall of the reducer matches the sealing ring.

[0017] In the above technical solution, the lower surface of the seal is a spherical arc surface, the top of the seal is provided with an installation groove, a third spring is provided inside the water outlet pipe, and one end of the third spring is fixedly connected to the seal, while the other end is fixedly set on the top of the inner wall of the water outlet pipe.

[0018] In the above technical solution, further, the bottom of the seal is integrally formed with a protrusion, and the protrusion extends to the hollow part of the sealing sleeve.

[0019] In the above technical solution, the sealing sleeve further includes:

[0020] The exterior wall is sealed to the inner wall of the water outlet pipe.

[0021] The inner ring wall extends upward from the bottom of the outer wall, and an opening slot is provided at the bottom of the inner ring wall.

[0022] A gap is provided between the outer wall of the inner ring wall and the inner wall of the outer ring wall;

[0023] Under the action of the third spring, the seal has a sealed state and an open state. In the sealed state, the seal forms a sealed barrier with the upper part of the inner ring wall through the third spring. In the open state, the seal separates from the upper part of the inner ring wall to form a water outlet gap.

[0024] In the above technical solution, further, the upper part of the inner ring wall is a bowl-shaped lifting ring, and the upper free inner surface of the lifting ring is a spherical arc surface that matches the lower surface of the seal.

[0025] In the above technical solution, the outer perimeter of the outer wall is further provided with an upward-curving ring wall that rises outward from the bottom of the outer wall, and the lower end of the water outlet pipe has a limiting step that matches the upward-curving ring wall.

[0026] In the above technical solution, furthermore, the inner wall of the inner ring wall is provided with several sets of circular reinforcing bars.

[0027] The beneficial effects of this utility model are as follows:

[0028] 1. The first spring provides the inlet pipe with height compensation capability, and this structure effectively solves the suspension problem during the coupling and insertion / removal process of the upper and lower connecting seats.

[0029] 2. The reducer adopts a stepped structure, with its outer wall fitting against the inner wall of the opening groove and tightly abutting against the sealing ring to form a double seal, effectively preventing water leakage during insertion and removal.

[0030] 3. The inner wall of the inner ring is provided with several sets of circular ribs. The circular ribs can enhance the structural strength of the inner ring wall and prevent the inner ring wall from deforming when the reducer is inserted. At the same time, the circular ribs can form multiple contacts with the outer wall of the reducer, further improving the sealing effect and reducing the risk of liquid leakage. Attached Figure Description

[0031] Figure 1 This is a working effect diagram of this utility model;

[0032] Figure 2 This is a schematic diagram of the structure of this utility model;

[0033] Figure 3 This is an exploded view of this utility model;

[0034] Figure 4 This is a cross-sectional view of the internal structure of this utility model;

[0035] Figure 5 This is the utility model Figure 4 A magnified view of a section at point A in the middle;

[0036] Figure 6 This is a schematic diagram of the sealing sleeve structure of this utility model;

[0037] Figure 7 This is a working effect diagram of another embodiment of the present invention;

[0038] Figure 8 This is a schematic diagram of another embodiment of the present invention;

[0039] The markings in the diagram are as follows: 1-Upper connecting seat, 2-Lower connecting seat, 3-Inlet pipe, 4-Outlet pipe, 5-Sealing sleeve, 6-Sealing element, 7-First spring, 8-Slide rod, 9-Leak-proof block, 10-Second spring, 11-Limiting cylinder, 12-Opening groove, 13-Sealing ring, 14-Reducer, 15-Mounting groove, 16-Third spring, 17-Protrusion, 18-Outer wall, 19-Inner ring wall, 20-Gap, 21-Lifting ring, 22-Upturned ring wall, 23-Limiting step, 24-Limiting disc, 25-Ring rib. Detailed Implementation

[0040] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0041] Example 1:

[0042] This embodiment provides a water-proof coupler, including an upper connecting seat 1 and a lower connecting seat 2;

[0043] Water inlet pipe 3 and water outlet pipe 4 are provided. The water inlet pipe 3 is elastically installed on the lower connecting seat 2 by the first spring 7, and the water outlet pipe 4 that cooperates with the water inlet pipe 3 is installed on the upper connecting seat 1.

[0044] A sealing assembly is provided between the inlet pipe 3 and the outlet pipe 4;

[0045] Slide rod 8 is vertically slidable inside the water inlet pipe 3, and its top abuts against the sealing assembly;

[0046] Leak-proof block 9 is fixedly connected to the side wall of slide rod 8, and it is adapted to the water outlet port of water inlet pipe 3 to seal the water outlet port.

[0047] The second spring 10 is provided on the slide rod 8. Its elastic force can drive the slide rod 8 to move the anti-leakage block 9 to seal the water outlet of the water inlet pipe 3.

[0048] As can be seen in this embodiment, the lower connecting seat 2 is elastically mounted with the inlet pipe 3 via the first spring 7. The first spring 7 is sleeved on the outer periphery of the inlet pipe 3, with its upper end abutting against the annular protrusion on the side wall of the inlet pipe 3, and its lower end fixedly connected to the internal mounting cavity of the lower connecting seat 2. The upper connecting seat 1 is mounted with the outlet pipe 4 that cooperates with the inlet pipe 3. The setting of the first spring 7 enables the inlet pipe 3 to have height compensation capability. During the coupling insertion and removal process of the upper connecting seat 1 and the lower connecting seat 2, this structure effectively solves the suspension problem. In the uncoupled state, although the inlet pipe 3 is in a cantilevered state, the supporting force of the first spring 7 can counteract the downward tendency caused by its own weight, maintaining the axial perpendicularity of the inlet pipe 3. When the coupling operation is performed, even if there is a slight misalignment between the upper connecting seat 1 and the lower connecting seat 2, the first spring 7 can automatically compensate for the installation error through radial micro-deformation, ensuring the inlet pipe 3 is in a stable position. The concentricity of the water pipe 3 and the outlet pipe 4 avoids misalignment during insertion and removal due to suspension, and reduces damage to the sealing structure from hard impacts. It also ensures precise connection between the inlet pipe 3 and the outlet pipe 4. A sealing component is provided between the inlet pipe 3 and the outlet pipe 4 to prevent water leakage when the upper connector 1 is inserted and removed from the lower connector 2. A sliding rod 8 slides vertically inside the inlet pipe 3, and its top abuts against the sealing component. A leak-proof block 9 is fixedly connected to the side wall of the sliding rod 8 and is adapted to the outlet port of the inlet pipe 3 to seal the outlet port. The leak-proof block 9 can be made of elastic material such as rubber. A second spring 10 is provided on the sliding rod 8. Its elasticity can drive the sliding rod 8 to move the leak-proof block 9 to seal the outlet port of the inlet pipe 3. In the natural state, the leak-proof block 9 presses the outlet port of the inlet pipe 3 under the elasticity of the second spring 10 to achieve a sealing effect.

[0049] Example 2:

[0050] This embodiment provides a water-proof coupler, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0051] A limiting plate 24 is fixedly installed on the side wall of the slide rod 8. The limiting plate 24 slides inside the water inlet pipe 3. A limiting cylinder 11 is fixedly installed at the lower end of the inside of the water inlet pipe 3. The slide rod 8 is slidably connected to the limiting cylinder 11. The second spring 10 is installed between the limiting plate 24 and the limiting cylinder 11.

[0052] As can be seen from this embodiment, in order to further optimize the sliding stability of the slide rod 8 and the installation reliability of the second spring 10, a limiting plate 24 is fixedly provided on the side wall of the slide rod 8. The limiting plate 24 slides within the water inlet pipe 3. A limiting cylinder 11 is fixedly provided at the lower end of the inside of the water inlet pipe 3. The slide rod 8 is slidably connected to the limiting cylinder 11. The second spring 10 is located between the limiting plate 24 and the limiting cylinder 11. The limiting plate 24 can prevent the slide rod 8 from deviating during the sliding process, ensuring the precise alignment of the anti-leakage block 9 with the water outlet of the water inlet pipe 3. The limiting cylinder 11 not only provides sliding guidance for the slide rod 8, but also supports the second spring 10, preventing the second spring 10 from bending and deforming during compression and rebound.

[0053] Example 3:

[0054] This embodiment provides a water-proof coupler, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0055] The sealing assembly includes:

[0056] A sealing sleeve 5 is installed at the lower end of the water outlet pipe 4;

[0057] Seal 6: A seal 6 that seals with the sealing sleeve 5 is installed inside the water outlet pipe 4.

[0058] Opening groove 12 is formed on the inner wall of the sealing sleeve 5 near the lower connecting seat 2;

[0059] A sealing ring 13 is fixedly connected to the end of the opening groove 12;

[0060] The reducer 14 is fixedly connected to the top of the water inlet pipe 3. The opening groove 12 is used for the insertion of the reducer 14. The side wall of the reducer 14 cooperates with the sealing ring 13.

[0061] As can be seen in this embodiment, a sealing sleeve 5 is installed at the lower end of the water outlet pipe 4. The sealing sleeve 5 can be made of elastic materials such as rubber and is press-fitted with the inner wall of the water outlet pipe 4 to ensure the installation is airtight. A sealing element 6 is installed inside the water outlet pipe 4 to seal with the sealing sleeve 5. An opening groove 12 is opened on the inner wall of the sealing sleeve 5 near the lower connecting seat 2. A sealing ring 13 is fixedly connected to the end of the opening groove 12. The sealing ring 13 and the sealing sleeve 5 are integrally formed. A reducer 14 is integrally formed on the top of the water inlet pipe 3. Compared with the split water inlet pipe structure, the integrated structure can further prevent water overflow. The opening groove 12 is used for the insertion of the reducer 14. The side wall of the reducer 14 is matched with the sealing ring 13. The reducer 14 adopts a stepped structure. Its outer wall is close to the inner wall of the opening groove 12 and at the same time, it is tightly abutted with the sealing ring 13 to form a double seal, which effectively prevents water leakage during insertion and removal.

[0062] Example 4:

[0063] This embodiment provides a water-proof coupler, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0064] The lower surface of the seal 6 is a spherical arc surface, and the top of the seal 6 is provided with an installation groove 15. A third spring 16 is provided inside the water outlet pipe 4, and one end of the third spring 16 is fixedly connected to the seal 6, while the other end is fixedly set on the top of the inner wall of the water outlet pipe 4.

[0065] As can be seen in this embodiment, the lower surface of the seal 6 is a spherical arc surface, and the top of the seal 6 is provided with an installation groove 15. A third spring 16 is provided inside the water outlet pipe 4, and one end of the third spring 16 is fixedly connected to the seal 6, while the other end is fixedly set on the top of the inner wall of the water outlet pipe 4. The spherical arc surface design makes the contact area between the seal 6 and the sealing sleeve 5 larger, resulting in a better sealing effect. The third spring 16 provides continuous downward pressure to the seal 6, ensuring that the seal 6 and the sealing sleeve 5 fit tightly in the natural state, achieving a sealed isolation. When the reducer 14 pushes the seal 6, the third spring 16 is compressed, and the seal 6 separates from the sealing sleeve 5, forming a water outlet channel.

[0066] Example 5:

[0067] This embodiment provides a water-proof coupler, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0068] The bottom of the seal 6 is integrally formed with a protrusion 17, and the protrusion 17 extends to the hollow part of the sealing sleeve 5.

[0069] As can be seen in this embodiment, the bottom of the sealing element 6 is integrally formed with a protrusion 17, and the protrusion 17 extends to the hollow part of the sealing sleeve 5. During the coupling process of the upper connecting seat 1 and the lower connecting seat 2, the water inlet pipe 3 first seals and connects with the sealing sleeve 5, and then pushes open the protrusion 15. The protrusion 15 drives the sealing element 6 to move upward, and the sealing element 6 separates from the sealing sleeve 5, effectively opening the water injection channel. During the process of the upper connecting seat 1 and the lower connecting seat 2 separating, that is, the water inlet pipe 3 moves downward in the hollow part of the sealing sleeve 5, at this time, the combined force of the third spring 16 enables the sealing element 6 to form a sealing barrier with the sealing sleeve 5 to seal the water, and then the water inlet pipe 3 separates. Compared with the water supply mechanism of the coupler that uses water pressure to push open the steel ball, water is easy to accumulate between the steel ball and the sealing sleeve, which has an adsorption property and affects the water supply efficiency. This structure has no residual water retention. The design of the protrusion 17 does not need to consider the water pressure, has low requirements for the water pump, and has a wide range of applications.

[0070] Example 6:

[0071] This embodiment provides a water-proof coupler, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0072] Sealing sleeve 5 includes:

[0073] The outer wall 18 is sealed to the inner wall of the water outlet pipe 4.

[0074] An inner ring wall 19 is formed inside the outer wall 18, extending upward from the bottom of the outer wall 18. An opening slot 12 is provided at the lower part of the inner ring wall 19.

[0075] A gap 20 is provided between the outer wall of the inner ring wall 19 and the inner wall of the outer wall 18;

[0076] Under the action of the third spring 16, the seal 6 has a sealed state and an open state. In the sealed state, the seal 6 forms a sealed separation with the upper part of the inner ring wall 19 through the third spring 16. In the open state, the seal 6 separates from the upper part of the inner ring wall 19 to form a water outlet gap.

[0077] As can be seen in this embodiment, the outer wall 18 is sealed to the inner wall of the water outlet pipe 4. The outer wall of the outer wall 18 is provided with an annular groove, which cooperates with the protrusion of the inner wall of the water outlet pipe 4 to enhance installation stability and prevent the sealing sleeve 5 from falling off during use. An inner ring wall 19 extends upward from the bottom of the outer wall 18. An opening groove 12 is provided at the lower part of the inner ring wall 19. The height of the inner ring wall 19 is higher than that of the outer wall 18 to ensure the fitting length with the sealing element 6 and improve the sealing reliability. A gap 20 is provided between the outer wall of the inner ring wall 19 and the inner wall of the outer wall 18. The setting of the gap 20 can reduce the overall hardness of the sealing sleeve 5, so that the reducer 14 can be inserted more smoothly and avoid jamming.

[0078] Example 7:

[0079] This embodiment provides a water-proof coupler, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0080] The upper part of the inner ring wall 19 is a bowl-shaped lifting ring 21, and the upper free inner surface of the lifting ring 21 is a spherical arc surface that matches the lower surface of the seal 6.

[0081] As can be seen from this embodiment, the spherical arc surface design of the lifting ring 21 can make the sealing more stable and achieve the desired result without secondary processing. The processing is simple. The lifting ring 21 is set higher than the outer wall 18, which helps to increase the area of ​​the lifting ring 21, effectively ensuring the sealing performance and preventing the problem of excessive drop of the sealing element 6.

[0082] Example 8:

[0083] This embodiment provides a water-proof coupler, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0084] The outer perimeter of the outer wall 18 is also provided with an upturned ring wall 22 that rises outward from the bottom of the outer wall 18, and the lower end of the water outlet pipe 4 has a limiting step 23 that is adapted to the upturned ring wall 22.

[0085] As can be seen from this embodiment, the outer periphery of the outer wall 18 is also provided with an upward-curving ring wall 22 that flips outward from the bottom of the outer wall 18. The lower end of the pipe wall of the water outlet pipe 4 is provided with a limiting step 23 that is adapted to the upward-curving ring wall 22. The cooperation between the upward-curving ring wall 22 and the limiting step 23 can accurately limit the installation position of the sealing sleeve 5, which is convenient for quick positioning during assembly. At the same time, it prevents the sealing sleeve 5 from moving upward during use, ensuring the relative position of the sealing sleeve 5 and the water outlet pipe 4 is stable.

[0086] Example 9:

[0087] This embodiment provides a water-proof coupler, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0088] The inner wall 19 has several sets of circular reinforcing bars 25 on its inner wall.

[0089] As can be seen from this embodiment, the inner wall of the inner ring wall 19 is provided with several sets of circular ribs 25. The circular ribs 25 can enhance the structural strength of the inner ring wall 19 and prevent the inner ring wall 19 from deforming when the reducer 14 is inserted. At the same time, the circular ribs 25 can form multiple contacts with the outer wall of the reducer 14, further improving the sealing effect and reducing the risk of liquid leakage.

[0090] Working principle: In the uncoupled state, under the elastic force of the second spring 10, the slide rod 8 drives the anti-leakage block 9 to seal the water outlet port of the water inlet pipe 3; at the same time, the third spring 16 pushes the sealing element 6 to move downward, and the lower surface of the sealing element 6 is tightly fitted with the lifting ring 21 of the sealing sleeve 5 to form a double seal to prevent liquid leakage.

[0091] During coupling, the upper connecting seat 1 and the lower connecting seat 2 are connected. The reducer 14 at the top of the water inlet pipe 3 is inserted into the opening groove 12 of the sealing sleeve 5. The side wall of the reducer 14 is tightly fitted with the sealing ring 13 to form the first seal. As the connection depth increases, the top of the reducer 14 pushes the protrusion 17 of the sealing element 6. The sealing element 6 overcomes the elastic force of the third spring 16 and moves upward, disengaging from the lifting ring 21 to form a water outlet channel. At the same time, the slide rod 8 moves downward under the pressure of the protrusion 17, and the leak-proof block 9 disengages from the water outlet port of the water inlet pipe 3. Liquid can flow from the water inlet pipe 3 through the reducer 14 and the water outlet channel into the water outlet pipe 4.

[0092] During the decoupling process, the upper connecting seat 1 and the lower connecting seat 2 are separated, the reducer 14 gradually detaches from the sealing sleeve 5, the third spring 16 pushes the sealing element 6 downward to re-fit with the lifting ring 21 and close the water outlet channel. At the same time, the second spring 10 pushes the slide rod 8 upward, and the anti-leakage block 9 re-seals the water outlet port of the inlet pipe 3 to ensure that there is no residual water leakage during the separation process.

[0093] The embodiments of this application have been described above with reference to the accompanying drawings. Unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other. This application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. A water-proof coupler, comprising an upper connecting seat (1) and a lower connecting seat (2), characterized in that, Also includes: Water inlet pipe (3) and water outlet pipe (4), the lower connecting seat (2) is elastically mounted with water inlet pipe (3) by the first spring (7), and the upper connecting seat (1) is mounted with water outlet pipe (4) that cooperates with water inlet pipe (3); A sealing assembly is provided between the water inlet pipe (3) and the water outlet pipe (4); A sliding rod (8) is vertically slidable inside the water inlet pipe (3), and its top abuts against the sealing assembly; Leak-proof block (9), the side wall of the slide rod (8) is fixedly connected to the leak-proof block (9), and it is adapted to the water outlet port of the water inlet pipe (3) to seal the water outlet port; The second spring (10) is provided on the slide rod (8), and its elastic force can drive the slide rod (8) to drive the anti-leakage block (9) to seal the water outlet of the water inlet pipe (3).

2. The overflow-proof coupler according to claim 1, characterized in that, The slide rod (8) is fixedly provided with a limiting plate (24) on its side wall. The limiting plate (24) slides inside the water inlet pipe (3). The lower end of the water inlet pipe (3) is fixedly provided with a limiting cylinder (11). The slide rod (8) is slidably connected to the limiting cylinder (11). The second spring (10) is provided between the limiting plate (24) and the limiting cylinder (11).

3. The overflow-proof coupler according to claim 2, characterized in that, The sealing assembly includes: A sealing sleeve (5) is installed at the lower end of the water outlet pipe (4). The water outlet pipe (4) is equipped with a sealing element (6) that is in sealing cooperation with the sealing sleeve (5). An opening groove (12) is formed on the inner wall of one end of the sealing sleeve (5) near the lower connecting seat (2); A sealing ring (13) is fixedly connected to the end of the opening groove (12). A reducer (14) is fixedly connected to the top of the water inlet pipe (3). An opening groove (12) is used for inserting the reducer (14). The side wall of the reducer (14) cooperates with the sealing ring (13).

4. The overflow-proof coupler according to claim 3, characterized in that, The lower surface of the seal (6) is a spherical arc surface, and the top of the seal (6) is provided with an installation groove (15). A third spring (16) is provided inside the water outlet pipe (4), and one end of the third spring (16) is fixedly connected to the seal (6), and the other end is fixedly set on the top of the inner wall of the water outlet pipe (4).

5. The overflow-proof coupler according to claim 4, characterized in that, The bottom of the seal (6) is integrally formed with a protrusion (17), and the protrusion (17) extends to the hollow part of the sealing sleeve (5).

6. The overflow-proof coupler according to claim 5, characterized in that, The sealing sleeve (5) includes: The outer wall (18) is sealed to the inner wall of the water outlet pipe (4); Inner ring wall (19), the outer wall (18) extends upward from the bottom of the outer wall (18) to form an inner ring wall (19), and an opening groove (12) is provided at the lower part of the inner ring wall (19). A gap (20) is provided between the outer wall of the inner ring wall (19) and the inner wall of the outer wall (18). Under the action of the third spring (16), the sealing member (6) has a sealed state and an open state. In the sealed state, the sealing member (6) forms a sealed partition with the upper part of the inner ring wall (19) through the third spring (16). In the open state, the sealing member (6) separates from the upper part of the inner ring wall (19) to form a water outlet gap.

7. The overflow-proof coupler according to claim 6, characterized in that, The upper part of the inner ring wall (19) is a bowl-shaped lifting ring (21), and the upper free inner surface of the lifting ring (21) is a spherical arc surface that is adapted to the lower surface of the seal (6).

8. The overflow-proof coupler according to claim 7, characterized in that, The outer periphery of the outer wall (18) is also provided with an upturned ring wall (22) that flips outward from the bottom of the outer wall (18), and the lower end of the pipe wall of the water outlet pipe (4) is provided with a limiting step (23) that is compatible with the upturned ring wall (22).

9. The overflow-proof coupler according to claim 8, characterized in that, The inner wall (19) is provided with several sets of circular reinforcing bars (25).

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