Connecting device additionally arranged in anti-back-overflow pipe
By installing an anti-backflow pipe extension device on ordinary pipelines, and utilizing the reducing section and float limiting ring structure, the problem of existing one-way drain valves being unable to be freely added is solved, achieving convenient installation and effective anti-backflow, and also having an alarm function.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-18
- Publication Date
- 2026-04-07
AI Technical Summary
Existing one-way drain valves require a special connection structure and cannot be freely added to ordinary pipes in old houses, making pipe renovation inconvenient.
An anti-backflow pipe extension device is provided, including a lower connecting ring, a check valve, and an upper receiving assembly. Through the cooperation of the reducing part and lubricating oil, it can be installed on ordinary pipelines without special structures, and the anti-backflow function is achieved through a float and a limit ring.
It improves the convenience of pipeline modification, expands the scope of application, ensures that the float accurately blocks the through hole to prevent backflow, and monitors the status of the check valve through the alarm to provide timely warning.
Smart Images
Figure CN224094060U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to pipeline anti -overflow technical field more specifically, it is an anti -reverse overflow pipe inner adapter. BACKGROUND
[0002] The drainage pipeline system of each floor in the building is connected by the drainage vertical pipe. When the heavy rain or flood comes, if the drainage of the pipeline is not smooth or the vertical pipe is blocked, the pipeline of the low floor is easy to reverse, and the sewage will flow back and overflow from the toilet or floor drain, and even the bathroom will be flooded, which will affect the normal life of the residents and cause property loss.
[0003] A method for preventing sewage overflow and a one-way drainage valve are disclosed in a Chinese patent. A one-way drainage valve is added to the sewage system to block the upward overflow of sewage by closing the drainage channel with the buoyancy of water. When the sewage flows back, the valve core filled with air will generate upward buoyancy, and the valve core will float to block the discharge port of the valve body, or the valve core will block the discharge port of the sealed discharge device to prevent the reverse overflow of sewage. The one-way drainage valve is composed of three parts: a one-way valve, a discharge device and an exhaust device. The one-way valve is connected to the discharge device above and the exhaust device below. However, this one-way drainage valve has a disadvantage, that is, the pipeline needs to have a special connection structure for installation, and cannot be freely added to the original pipeline, which is inconvenient for pipeline renovation of old houses. SUMMARY
[0004] The utility model aims at overcoming the deficiency of the prior art that can only be used for adapting to the pipeline, and provides an anti-reverse overflow pipe inner adapter, which can be freely added to the ordinary pipeline, and improves the convenience of pipeline renovation and upgrading.
[0005] To solve the above technical problems, the utility model adopts the technical scheme of:
[0006] An anti-reverse overflow pipe inner adapter is provided, which comprises a lower connecting ring for embedding in an external pipeline, a check valve, and an upper receiving assembly for locking the external pipeline. The bottom of the check valve is provided with a variable diameter portion for changing the size of the lower connecting ring. The variable diameter portion is threadedly connected with the lower connecting ring. The top of the check valve is provided with a receiving port for inserting into the pipeline. The upper receiving assembly is connected with the receiving port.
[0007] Through the setting mode, when the increaser needs to be installed in the pipeline, the user first saws the pipeline into an upper pipeline and a lower pipeline, both of which are ordinary pipelines, and the names are only for distinction; then applies lubricating oil to the inside of the lower connecting ring, and threadedly connects the lower connecting ring with the variable diameter part, expands the outer diameter of the lower connecting ring through the variable diameter part until the outer diameter of the lower connecting ring is slightly smaller than the outer diameter of the lower pipeline, then inserts the check valve together with the lower connecting ring into the lower pipeline, the outside of the lower connecting ring abuts against the inside of the lower pipeline, because the inside of the lower connecting ring is coated with lubricating oil, the friction between the lower connecting ring and the check valve is smaller than the friction between the lower connecting ring and the lower pipeline, the variable diameter part rotates, continues to expand the diameter of the lower connecting ring, until the lower connecting ring is tightly attached to the lower pipeline and cannot rotate, then inserts the upper receiving assembly into the receiving port, and locks the upper pipeline through the upper receiving assembly, so as to install the increaser in the pipeline. The anti-backflow pipeline increaser can be used on ordinary pipelines, without the pipelines having special installation structures such as grooves or bosses, and does not need to be glued during installation, improving the installation convenience and expanding the application range.
[0008] Preferably, the outer connecting ring is made of rubber or other materials that are easy to deform. Through this setting mode, the variable diameter part is more likely to change the diameter of the outer connecting ring, and the connection between the outer connecting ring and the lower pipeline is more tightly, improving the leakage prevention effect and the stability of installation.
[0009] Preferably, the check valve comprises an upper receiving part, a floating ball and a lower receiving part, the upper receiving part is detachably connected with the lower receiving part, a limiting ring is arranged in the upper receiving part, a through hole with a diameter smaller than that of the floating ball is arranged in the middle of the limiting ring, a bracket is arranged in the lower receiving part, a drainage channel is formed between the middle of the limiting ring and the side of the bracket, the floating ball is movably arranged in the drainage channel, the receiving port is located at the top of the upper receiving part, and the variable diameter part is located at the bottom of the lower receiving part.
[0010] Through this setting mode, when normally draining water, the floating ball falls on the bracket under the action of gravity, the water flow of the upper pipeline passes through the middle of the limiting ring and the bracket beside the floating ball into the lower pipeline, without affecting the drainage; when the sewer pipe is blocked, causing the water level in the pipeline to rise, the floating ball rises with the water level until the through hole in the limiting plate is blocked by the floating ball, so that the water in the sewer cannot enter the upper pipeline through the through hole, thereby achieving the anti-backflow effect.
[0011] Preferably, the upper side of the limiting ring is in a funnel structure.
[0012] Through this setting mode, the deposition of silt and dirt in the sewage on the limiting ring during normal drainage can be effectively avoided, reducing the probability of blockage.
[0013] Preferably, the through hole edge of the limiting ring is provided with an arc structure matched with the floating ball.
[0014] Through the arrangement, when the floating ball floats up, the surface of the floating ball can be fully matched with the arc structure of the through hole edge, improving the sealing performance and preventing water from overflowing.
[0015] Preferably, the upper adapter further comprises an upper clamping ring, the upper clamping ring is located at the bottom of the limiting ring, the lower adapter further comprises a lower clamping ring, the lower clamping ring is arranged at the top of the variable diameter part, and the lower clamping ring is clamped with the upper clamping ring.
[0016] Preferably, the variable diameter part is a circular truncated cone structure with large upper part and small lower part, and the outer side of the variable diameter part is provided with threads.
[0017] Through the arrangement, when the variable diameter part is rotated into the lower connecting ring through the threads, the lower connecting ring is expanded by the variable diameter part, so that the size is changed.
[0018] Preferably, the check valve further comprises a plurality of limiting columns for limiting the movement of the floating ball, both ends of the limiting column are connected with the limiting ring and the bracket respectively, and the floating ball is movably arranged in a space surrounded by the limiting columns, the bracket and the limiting ring.
[0019] Through the arrangement, it is ensured that the floating ball can only move in the limiting space formed between the limiting columns, avoiding the floating ball floating left and right to cause the through hole of the limiting ring to be unable to be blocked.
[0020] Preferably, the limiting column comprises an upper column and a lower column, one end of the upper column is fixedly connected with the limiting ring, and the other end of the upper column is provided with a slot; one end of the lower column is fixedly connected with the bracket, and the other end of the lower column is inserted into the slot.
[0021] Through the arrangement, when the upper column and the lower column are inserted, a rotation stopping structure can be formed, avoiding the rotation between the upper adapter and the lower adapter, which is beneficial to improve the stability of installation.
[0022] Preferably, the upper adapter assembly comprises a locking ring and a sealing ring, the locking ring is threadedly connected with the top of the adapter port, the inner side of the adapter port is provided with a mounting groove, the bottom of the sealing ring is arranged on the mounting groove, and the sealing ring can abut against the locking ring.
[0023] Through the setting mode, when the upper pipeline is installed, the sealing ring is arranged in the installation groove, the locking ring is sleeved into the upper pipeline, then the upper pipeline is inserted into the receiving port, the locking ring is rotated downward, the locking ring is screwed with the receiving port, the sealing ring is extruded in the process of rotating the locking ring downward, the sealing ring is deformed inward and tightly abuts with the upper pipeline, so that the upper pipeline is locked and the sealing is ensured.
[0024] Preferably, the inner side of the sealing ring is further provided with a sealing convex strip, which is arranged downwardly inclined.
[0025] Through the setting mode, the sealing effect between the sealing convex strip and the upper pipeline can be further improved.
[0026] Preferably, the upper receiving assembly further comprises a gasket, which is arranged above the sealing ring, and the locking ring extrudes the sealing ring through the gasket.
[0027] Preferably, an alarm for monitoring water overflow is further included, which is clamped with the outer side of the receiving port.
[0028] Through the setting mode, when the check valve fails, the water level rises along the check valve, and when the water level rises to the alarm position, the alarm will alarm to remind the user.
[0029] Preferably, the alarm comprises a buzzer, a positive electrode circuit, a negative electrode circuit and a power supply, two metal guide sheets are embedded on the outer side of the receiving port, the positive electrode circuit and the negative electrode circuit are respectively abutted with the metal guide sheets, the buzzer is located on the negative electrode circuit or the positive electrode circuit, and the positive electrode circuit and the negative electrode circuit are in communication with the power supply.
[0030] Through the setting mode, under normal circumstances, the positive electrode circuit and the negative electrode circuit are in open circuit relationship, and the buzzer does not work; when the water level rises to the metal guide sheet, the sewage becomes a conductor between the positive electrode circuit and the negative electrode circuit, forming a path, and the buzzer works to remind the user that the waterway is reversed overflow.
[0031] Compared with the prior art, the utility model has the advantages that:
[0032] (1) The anti-reverse overflow pipe inner adapter of the utility model can be used on ordinary pipelines, without special installation structure such as groove or boss, and without adhesive in the installation process, so that the installation convenience is improved and the application range is expanded.
[0033] (2) Through the setting of the limiting column, the floating ball floats in the limiting space, so that the floating ball can accurately block the through hole in the middle of the limiting ring, and good anti-reverse overflow effect is achieved.
[0034] (3) through the setting of the limiting ring, both avoid the blockage caused by silt dirt deposition, and ensure that the floating ball and the hole edge can be fully attached, improve the anti-overflow effect.
[0035] (4) through the setting of the alarm, the working condition of the check valve can be monitored, when the check valve fails, the alarm is sent in time, to prevent further loss of expansion. BRIEF DESCRIPTION OF DRAWINGS
[0036] Fig. 1 It is an external structure schematic view of the anti-overflow pipe inner adapter of the utility model;
[0037] Fig. 2 It is an internal structure schematic view of the anti-overflow pipe inner adapter of the utility model;
[0038] Fig. 3 It is a check valve structure schematic view of the anti-overflow pipe inner adapter of the utility model;
[0039] Fig. 4 It is an installation structure schematic view of the anti-overflow pipe inner adapter of the utility model.
[0040] The illustration mark is explained as follows:
[0041] 1, lower connecting ring; 2, check valve; 21, reducing portion; 22, receiving port; 221, metal guide sheet; 23, upper receiving portion; 231, limiting ring; 232, upper clamping ring; 24, floating ball; 25, lower receiving portion; 251, bracket; 252, lower clamping ring; 26, limiting column; 261, upper column; 262, lower column; 3, upper receiving assembly; 31, locking ring; 32, sealing ring; 321, sealing convex strip; 33, gasket; 4, alarm; 5, upper pipeline; 6, lower pipeline. DETAILED DESCRIPTION
[0042] The utility model will be further explained in combination with specific implementation manners. Among them, the drawings are only used for example explanation, and the representation is only a schematic view, not a real object drawing, and can not be understood as the limitation of the patent; in order to better explain the embodiment of the utility model, some components of the drawings will be omitted, enlarged or reduced, and the size of the actual product is not represented; for those skilled in the art, it is understandable that some known structures and their description in the drawings can be omitted.
[0043] The same or similar reference signs in the drawings of the embodiments of the present application correspond to the same or similar components; in the description of the present application, it should be understood that if the orientations or positional relationships indicated by the terms "upper", "lower", "left", "right" and the like are based on the orientations or positional relationships shown in the drawings, they are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed in a specific orientation and be operated, therefore, the terms describing the positional relationships in the drawings are only used for exemplary illustration, and cannot be understood as a limitation on the present patent, and for those skilled in the art, the specific meanings of the above terms can be understood according to the specific circumstances.
[0044] Embodiment 1
[0045] As Figs. 1 to 4 It is a first embodiment of the anti-backflow pipe inner extension connector of the present application, which comprises a lower connecting ring 1 for embedding in an external pipeline, a check valve 2 and an upper receiving assembly 3 for locking the external pipeline, the bottom of the check valve 2 is provided with a variable diameter part 21 for changing the size of the lower connecting ring 1, the variable diameter part 21 is threadedly connected with the lower connecting ring 1, the top of the check valve 2 is provided with a receiving port 22 for inserting into the pipeline, and the upper receiving assembly 3 is connected with the receiving port 22.
[0046] Through this setting mode, when it is necessary to install the extension connector in the pipeline, the user first saws the pipeline into an upper pipeline 5 and a lower pipeline 6, both of which are ordinary pipelines, and the naming is only for distinction; then, lubricating oil is applied to the inner side of the lower connecting ring 1, and the lower connecting ring 1 is threadedly connected with the variable diameter part 21, the diameter of the lower connecting ring 1 is expanded through the variable diameter part 21 until the outer diameter of the lower connecting ring 1 is slightly smaller than the outer diameter of the lower pipeline 6, then the check valve 2 together with the lower connecting ring 1 is inserted into the lower pipeline 6, the outer side of the lower connecting ring 1 abuts against the inner side of the lower pipeline 6, because the inner side of the lower connecting ring 1 is coated with lubricating oil, the friction between the lower connecting ring 1 and the check valve 2 is smaller than the friction between the lower connecting ring 1 and the lower pipeline 6, the variable diameter part 21 rotates to continue expanding the diameter of the lower connecting ring 1 until the lower connecting ring 1 is tightly attached to the lower pipeline 6 and cannot rotate, then the receiving port 22 is inserted into the upper pipeline 5 and locked by the upper receiving assembly 3, so as to install the extension connector in the pipeline. This anti-backflow pipe inner extension connector can be used on ordinary pipelines, without the need for the pipeline to have special installation structures such as grooves or bosses, and the installation process does not require adhesive, improving the installation convenience and expanding the application range.
[0047] As an embodiment of the present application, the outer connecting ring is made of rubber or other materials that are easy to deform. Through this setting mode, it is easier for the variable diameter part 21 to change the diameter of the outer connecting ring, and it is also beneficial to the connection between the outer connecting ring and the lower pipeline 6 to be more tightly connected, improving the leakage prevention effect and the stability of the installation.
[0048] As an embodiment of the utility model, the check valve 2 includes an upper receiving part 23, a floating ball 24 and a lower receiving part 25, the upper receiving part 23 is detachably connected with the lower receiving part, a limiting ring 231 is arranged in the upper receiving part 23, a through hole with a diameter smaller than that of the floating ball 24 is arranged in the middle of the limiting ring 231, a bracket 251 is arranged in the lower receiving part 25, a drainage channel is formed beside the middle of the limiting ring 231 and the bracket 251, the floating ball 24 is movably arranged in the drainage channel, the receiving port 22 is located at the top of the upper receiving part 23, and the reducing part 21 is located at the bottom of the lower receiving part 25.
[0049] Through the arrangement, when normal drainage is performed, the floating ball 24 falls on the bracket 251 under the action of gravity, the water flow of the upper pipeline 5 passes through the middle of the limiting ring 231 and the bracket 251 beside the floating ball 24 to enter the lower pipeline 6, and the drainage is not affected; when the sewer pipe is blocked to cause the water level in the pipeline to rise, the floating ball 24 rises with the water level until the floating ball 24 blocks the through hole in the limiting plate, so that the water in the sewer pipe cannot pass through the through hole to enter the upper water pipe, thereby realizing the anti-backflow effect.
[0050] As an embodiment of the utility model, the upper side of the limiting ring 231 is in a funnel structure.
[0051] Through the arrangement, the deposition of the silt and dirt in the sewage on the limiting ring 231 during normal drainage can be effectively avoided, and the probability of blockage is reduced.
[0052] As an embodiment of the utility model, the edge of the through hole in the limiting ring 231 is provided with an arc structure matched with the floating ball 24.
[0053] Through the arrangement, when the floating ball 24 floats up, the surface of the floating ball 24 can be fully matched with the arc structure of the edge of the through hole, the sealing property is improved, and the water flow backflow is prevented.
[0054] As an embodiment of the utility model, the upper receiving part 23 is further provided with an upper clamping ring 232, the upper clamping ring 232 is located at the bottom of the limiting ring 231, the lower receiving part 25 is further provided with a lower clamping ring 252, the lower clamping ring 252 is arranged at the top of the reducing part 21, and the lower clamping ring 252 is clamped with the upper clamping ring 232.
[0055] As an embodiment of the utility model, the reducing part 21 is in a circular truncated cone structure with a large upper diameter and a small lower diameter, and the outer side of the reducing part 21 is provided with a thread.
[0056] Through the arrangement, as the reducing part 21 is rotated into the lower connecting ring 1 through the thread, the lower connecting ring 1 is expanded by the reducing part 21, so that the size is changed.
[0057] As an embodiment of the utility model, the check valve 2 further comprises a plurality of limiting columns 26 for limiting the movement of the floating ball 24, both ends of the limiting column 26 are connected with the limiting ring 231 and the bracket 251 respectively, and the floating ball 24 is movably arranged in the space surrounded by the plurality of limiting columns 26, the bracket 251 and the limiting ring 231.
[0058] Through the arrangement, the floating ball 24 can only move in the limiting space formed between the limiting columns 26, avoiding the floating of the floating ball 24 left and right to cause the failure to block the through hole on the limiting ring 231.
[0059] As an embodiment of the utility model, the limiting column 26 comprises an upper column 261 and a lower column 262, one end of the upper column 261 is fixedly connected with the limiting ring 231, and the other end of the upper column 261 is provided with a slot; one end of the lower column 262 is fixedly connected with the bracket 251, and the other end of the lower column 262 is inserted into the slot.
[0060] Through the arrangement, when the upper column 261 and the lower column 262 are inserted, a rotation-stopping structure can be formed, avoiding the rotation between the upper supporting part 23 and the lower supporting part 25, and being beneficial to improving the stability of installation.
[0061] Embodiment 2
[0062] The following is a second embodiment of the anti-reverse overflow pipe inner adapter of the utility model, which is similar to the embodiment 1, and the difference lies in that the upper supporting assembly 3 is further limited.
[0063] As an embodiment of the utility model, the upper supporting assembly 3 comprises a locking ring 31 and a sealing ring 32, the locking ring 31 is threadedly connected with the top of the supporting port 22, the inner side of the supporting port 22 is provided with a mounting groove, the bottom of the sealing ring 32 is arranged on the mounting groove, and the sealing ring 32 can abut against the locking ring 31.
[0064] Through the arrangement, when the upper pipeline 5 is installed, the sealing ring 32 is arranged in the mounting groove first, and the locking ring 31 is sleeved into the upper pipeline 5, then the upper pipeline 5 is inserted into the supporting port 22, the locking ring 31 is rotated downward, the locking ring 31 is threadedly connected with the supporting port 22, the sealing ring 32 is extruded in the process of rotating the locking ring 31 downward, the sealing ring 32 is deformed inwardly and tightly abuts against the upper pipeline 5, so that the upper pipeline 5 is locked and the sealing is ensured.
[0065] As an embodiment of the utility model, the upper supporting assembly 3 further comprises a gasket 33, the gasket 33 is arranged above the sealing ring 32, and the locking ring 31 extrudes the sealing ring 32 through the gasket 33.
[0066] As an embodiment of the utility model, the inner side of the sealing ring 32 is further provided with a sealing convex strip 321, and the sealing convex strip 321 is arranged downwardly.
[0067] Through the setting mode, the sealing effect between the sealing convex strip 321 and the upper pipeline 5 can be further improved.
[0068] Embodiment 3
[0069] The following is a third embodiment of the anti-reverse overflow pipe inner adapter of the utility model, which is similar to the first embodiment, and the difference is that it further comprises an alarm 4.
[0070] As an embodiment of the utility model, the alarm 4 is clamped with the outside of the receiving port 22.
[0071] Through the setting mode, when the check valve 2 fails, the water level rises along the check valve 2, and when it rises to the position of the alarm 4, the alarm 4 will alarm to remind the user.
[0072] As an embodiment of the utility model, the alarm 4 comprises a buzzer, a positive electrode circuit, a negative electrode circuit and a power supply, two metal conductive sheets 221 are embedded on the outside of the receiving port 22, the positive electrode circuit and the negative electrode circuit are respectively abutted with the metal conductive sheets 221, the buzzer is located on the negative electrode circuit or the positive electrode circuit, and the positive electrode circuit and the negative electrode circuit are in communication with the power supply.
[0073] Through the setting mode, under normal circumstances, the positive electrode circuit and the negative electrode circuit are in open circuit relationship, and the buzzer does not work; when the water level rises to the metal conductive sheet 221, the sewage becomes a conductor between the positive electrode circuit and the negative electrode circuit, forming a path, and the buzzer works to remind the user that the waterway has reverse overflow.
[0074] Obviously, the above embodiments of the utility model are only examples for clearly illustrating the utility model, and are not the limitation of the embodiments of the utility model. For ordinary skilled in the art, other different forms of changes or variations can be made on the basis of the above description. Here, all the embodiments are not required to be exhausted. Any modification, equivalent replacement and improvement made within the spirit and principle of the utility model should be included in the protection scope of the utility model claims.
Claims
1. An anti-overflow pipe internal expansion device, characterized in that, It includes a lower connecting ring (1) for embedding in an external pipe, a check valve (2) and an upper receiving assembly (3) for locking the external pipe. The bottom of the check valve (2) is provided with a variable diameter part (21) for changing the size of the lower connecting ring (1). The variable diameter part (21) is threadedly connected to the lower connecting ring (1). The top of the check valve (2) is provided with a receiving interface (22) for inserting into the pipe. The upper receiving assembly (3) is connected to the receiving interface (22).
2. The anti-backflow pipe extension device according to claim 1, characterized in that, The check valve (2) includes an upper receiving part (23), a float (24) and a lower receiving part (25). The upper receiving part (23) and the lower receiving part are detachably connected. The upper receiving part (23) is provided with a limiting ring (231). The middle part of the limiting ring (231) is provided with a through hole with a diameter smaller than that of the float (24). The lower receiving part (25) is provided with a bracket (251). The middle part of the limiting ring (231) and the side of the bracket (251) form a drainage channel. The float (24) is movably installed in the drainage channel. The receiving interface (22) is located at the top of the upper receiving part (23), and the variable diameter part (21) is located at the bottom of the lower receiving part (25).
3. The anti-backflow pipe extension device according to claim 2, characterized in that, The upper receiving part (23) is also provided with an upper snap ring (232), which is located at the bottom of the limiting ring (231). The lower receiving part (25) is also provided with a lower snap ring (252), which is installed on the top of the variable diameter part (21) and snaps with the upper snap ring (232).
4. The anti-backflow pipe extension device according to claim 3, characterized in that, The check valve (2) also includes several limiting posts (26) for limiting the movement of the float (24). The two ends of the limiting posts (26) are respectively connected to the limiting ring (231) and the bracket (251). The float (24) is movably installed in the space enclosed by the limiting posts (26), the bracket (251) and the limiting ring (231).
5. The anti-backflow pipe extension device according to claim 4, characterized in that, The limiting post (26) includes an upper post (261) and a lower post (262). One end of the upper post (261) is fixedly connected to the limiting ring (231), and the other end of the upper post (261) is provided with a slot. One end of the lower post (262) is fixedly connected to the bracket (251), and the other end of the lower post (262) is inserted into the slot.
6. The anti-backflow pipe extension device according to claim 1, characterized in that, The variable diameter section (21) is a frustum structure with a larger upper section and a smaller lower section.
7. The anti-backflow pipe extension device according to claim 1, characterized in that, The upper receiving component (3) includes a locking ring (31) and a sealing ring (32). The locking ring (31) is threaded to the top of the receiving interface (22). The inner side of the receiving interface (22) is provided with an installation groove. The bottom of the sealing ring (32) is installed on the installation groove. The sealing ring (32) can abut against the locking ring (31).
8. The anti-backflow pipe extension device according to claim 7, characterized in that, The inner side of the sealing ring (32) is also provided with a sealing protrusion (321), which is inclined downward.
9. The anti-backflow pipe extension device according to claim 1, characterized in that, It also includes an alarm (4) for monitoring overflow, which is snapped onto the outside of the receiving interface (22).
10. The anti-backflow pipe extension device according to claim 9, characterized in that, The alarm (4) includes a buzzer, a positive circuit, a negative circuit and a power supply. Two metal conductors (221) are embedded on the outside of the receiving interface (22). The positive circuit and the negative circuit are respectively in contact with the metal conductors (221). The buzzer is located on the negative circuit or the positive circuit. The positive circuit and the negative circuit are both connected to the power supply.