Water backflow prevention device for gas pipeline

Abstract

The application provides a waterproof backflow prevention device for a gas pipeline. The waterproof backflow prevention device comprises a pipeline body, a water collecting tank and an annular float. The input end of the pipeline body is connected with a gas main pipe, and the output end of the pipeline body is connected with a gas vertical pipe. The pipeline body is of a tubular structure, and a through hole is formed in the center of the bottom end of the pipeline body. The top of the water collecting tank is open and connected with the through hole. The water collecting tank and the pipeline body form a water collecting chamber. The annular float is arranged in the water collecting chamber. An up-down flow channel is formed in the annular float. The annular float is arranged in the through hole. The top end of the annular float is symmetrically provided with clamping blocks. The inner wall of the top of the pipeline body is provided with clamping grooves corresponding to the positions of the clamping blocks. The top end of the flow channel is connected with the inside of the pipeline body, and the bottom end is connected with the water collecting chamber. The waterproof backflow prevention device can seal and block the pipeline body, has quick response, is safe and reliable, has compact structure, and is convenient to install and maintain.

Description

Technical Field

[0001] This invention belongs to the field of gas pipeline safety technology, and more specifically, relates to a waterproof backflow device for gas pipelines. Background Technology

[0002] Natural gas, as a clean energy source, has been widely used in residential life and industrial production. In the gas transmission system, the gas riser connects the main gas pipeline to each user unit, delivering the gas to the end user.

[0003] However, in actual use, the following safety hazards exist: Water pipes, drainage pipes, and gas pipes are densely packed in the kitchen and balcony areas, with similar pipe routes and diameters. Coupled with aging and missing markings, they are easily confused, making it easy for renovation workers and residents to mistakenly connect pipes. Homeowners, in order to optimize water systems, install water heaters, washing machines, water purifiers, and separate water supply in kitchens and bathrooms, often fail to report to the gas company and dismantle and connect the pipes themselves. They lack understanding of pipe routes and the differences between gas sources, mistakenly connecting domestic water pipes and drainage hoses directly to gas branch pipes, gas meter interfaces, and stove inlets, directly causing water backflow into the gas pipeline system. Home renovation plumbers without gas installation qualifications rely solely on experience to lay and connect pipes, failing to verify gas source interfaces or distinguish between gas supply points, directly connecting them for convenience, becoming a high-risk group for incorrect connections leading to water ingress. Gas water heaters, wall-mounted boilers, and other integrated water and gas equipment often have unclear water and gas interface markings, are installed incorrectly, or have hoses that are haphazardly connected and mixed. If a misconnection occurs, tap water can backflow into the main gas pipe through the gas riser, causing gas outages in a single building or even the entire community. Restoring gas supply is costly and poses serious safety risks.

[0004] Currently, several gas pipeline backflow prevention devices have been proposed. For example, one solution involves installing a float valve between the inlet and outlet pipes to seal the pipe inlet; another solution involves creating a side cavity in the pipe wall with a sealing ball inside, using buoyancy to push the sealing ball to the inlet end for sealing. However, these existing devices have the following shortcomings: First, the movement trajectory of the float or sealing ball is not stable enough and is prone to deviation, resulting in insufficient sealing reliability; second, the structure is relatively complex, making installation, maintenance, and repair inconvenient; third, some devices only have an alarm function and lack physical blocking function, thus failing to truly prevent water backflow.

[0005] Therefore, there is an urgent need for a device that can automatically and reliably block water from entering the gas main when water backflow occurs in a user unit; and that is compact in structure, easy to install and maintain; and a reusable waterproof backflow device. Summary of the Invention

[0006] Therefore, to solve the above-mentioned technical problems, the present invention proposes a waterproof backflow device for gas pipelines, including a gas riser 10, a gas main 20, and a waterproof backflow device 30. The waterproof backflow device 30 includes a pipe body 301, a water collection tank 302, and an annular float 303. The pipe body 301 and the water collection tank 302 are integrally formed. The input end of the pipe body 301 is connected to the gas main 20, and the output end of the pipe body 301 is connected to the gas riser 10. The pipe body 301 has a tubular structure with a through hole 40 at the center of its bottom end. The top of the water collection tank 302 is open and connected to the through hole 40. The water collection tank 302 and the pipe body 301 enclose a water collection chamber 50. The annular float 303 is disposed in the water collection chamber 50. The density of the annular float 303 is less than that of water. The annular float 303 has a vertically penetrating flow channel 60. The annular float 303 is inserted into the through hole 40. Symmetrical locking blocks 70 are provided on both sides of the top of the annular float 303. A slot 80 corresponding to the position of the locking blocks 70 is provided on the inner wall of the top of the pipe body 301. The top of the flow channel 60 communicates with the interior of the pipe body 301, and the bottom communicates with the water collection chamber 50. With the waterproof backflow device 30, when water flows back, as the water level in the water collection chamber 50 rises, the annular float 303 rises synchronously until the locking blocks 70 engage with the slots 80, thus sealing and blocking the pipe body 301. This method is rapid, safe, reliable, and has a compact overall structure. The through hole 40 guides the floating of the annular float 303, ensuring reliable sealing. Simultaneously, when the water level in the water collection chamber 50 drops, the annular float 303 automatically falls back to its normal position under gravity, restoring the device to its ventilated state. No manual reset is required, it is reusable, and installation and maintenance are convenient.

[0007] A waterproof backflow prevention device for gas pipelines includes a gas riser 10, a gas main 20, and a waterproof backflow prevention device 30. The waterproof backflow prevention device 30 includes a pipe body 301, a water collection tank 302, and an annular float 303. The pipe body 301 and the water collection tank 302 are integrally formed. The input end of the pipe body 301 is connected to the gas main 20, and the output end of the pipe body 301 is connected to the gas riser 10. The pipe body 301 has a tubular structure with a through hole 40 at the center of its bottom end. The top of the water collection tank 302 is open and connected to the through hole 40. The water collection tank 302 and the pipe body 301 form a water collection chamber 50. The annular float 303 is provided in the water collection chamber 50. The density of the annular float 303 is less than that of water. The annular float 303 has a vertically penetrating flow channel 60. The annular float 303 passes through the through hole 40. The top of the annular float 303 has symmetrically arranged locking blocks 70 on both sides. The top inner wall of the pipe body 301 has a locking groove 80 corresponding to the position of the locking blocks 70. The top of the flow channel 60 is connected to the inside of the pipe body 301, and the bottom is connected to the water collection chamber 50.

[0008] Furthermore, the diameter of the annular float 303 is smaller than the diameter of the through hole 40, and the diameter of the annular float 303 is equal to the diameter of the inner wall of the pipe body 301. The sum of the height of the annular float 303 and the height of the locking block 70 is greater than the diameter of the inner wall of the pipe body 301. When the locking block 70 is engaged with the locking groove 80, the lower part of the annular float 303 passes through the through hole 40, and the bottom end of the annular float 303 is flush with the bottom outer wall of the pipe body 301.

[0009] Furthermore, the annular float 303 is integrally formed with the locking block 70, the top of the locking block 70 is flush with the bottom inner wall of the pipe body 301, and the lower two sides of the annular float 303 are symmetrically provided with outwardly extending protrusions 170, which are integrally formed with the annular float 303.

[0010] Furthermore, the annular float 303 has a hollow internal structure, and the annular float 303, the locking block 70, and the protrusion 170 are all made of PE or PP.

[0011] Furthermore, both the protrusion 170 and the locking block 70 are connected to a sealing gasket 90, which is made of silicone or rubber.

[0012] Furthermore, there is a first gap 100 between the protrusion 170 and the inner wall of the water collection tank 302, and a second gap 110 between the annular float 303 and the side wall of the through hole 40.

[0013] Furthermore, the slot 80 is provided with an inclined first guide surface 120, and the block 70 is provided with a second guide surface 130 that is adapted to the first guide surface 120.

[0014] Furthermore, the bottom of the water collection tank 302 is provided with an inspection cap 140, which is threadedly connected to the water collection tank 302.

[0015] Furthermore, drainage holes 150 are provided on both sides of the pipe body 301 near the water collection tank 302.

[0016] Furthermore, the top of the pipe body 301 is provided with an observation window 160.

[0017] Beneficial effects of the present invention: The present invention proposes a waterproof backflow device for gas pipelines, including a gas riser 10, a gas main 20, and a waterproof backflow device 30. The waterproof backflow device 30 includes a pipe body 301, a water collection tank 302, and an annular float 303. The pipe body 301 and the water collection tank 302 are integrally formed. The input end of the pipe body 301 is connected to the gas main 20, and the output end of the pipe body 301 is connected to the gas riser 10. The pipe body 301 has a tubular structure with a through hole 40 at the center of its bottom end. The top of the water collection tank 302 is open and connected to the through hole 40. The water collection tank 302 and the pipe body 301 enclose a water collection chamber 50. The annular float 303 is disposed in the water collection chamber 50. The density of the annular float 303 is less than that of water. The annular float 303 has a vertically penetrating flow channel 60. 3. The annular float 303 is symmetrically provided with locking blocks 70 on both sides of its top end, and the inner wall of the top of the pipe body 301 is provided with a locking groove 80 corresponding to the position of the locking blocks 70. The top end of the flow channel 60 is connected to the inside of the pipe body 301, and the bottom end is connected to the water collection chamber 50. With the provision of a waterproof backflow device 30, when water flows backflow, as the water level in the water collection chamber 50 rises, the annular float 303 rises synchronously until the locking blocks 70 engage with the locking grooves 80, thereby sealing and blocking the pipe body 301. The response is rapid, safe and reliable, and the overall structure is compact. The through hole 40 guides the floating of the annular float 303, ensuring a reliable seal. At the same time, when the water level in the water collection chamber 50 drops, the annular float 303 automatically falls back to its normal position under the action of gravity, and the device returns to the air-permeable state. No manual reset is required, it can be reused, and installation and maintenance are convenient. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the installation structure of a waterproof backflow device for gas pipelines according to the present invention.

[0019] Figure 2 This is a schematic diagram of the structure of a waterproof backflow device for a gas pipeline according to the present invention.

[0020] Figure 3 This is a partially enlarged view of a waterproof backflow device for gas pipelines according to the present invention.

[0021] Figure 4 This is a schematic diagram of the structure of a waterproof backflow device for a gas pipeline according to the present invention.

[0022] Figure 5 This is a partial structural schematic diagram of a waterproof backflow device for gas pipelines according to the present invention.

[0023] Explanation of key component symbols:

[0024] Gas riser 10, gas main pipe 20, waterproof backflow device 30, pipe body 301, water collection tank 302, annular float 303, through hole 40, water collection chamber 50, flow channel 60, locking block 70, locking groove 80, sealing gasket 90, first gap 100, second gap 110, first guide surface 120, second guide surface 130, inspection cap 140, drain hole 150, observation window 160, protrusion 170.

[0025] The following detailed description, in conjunction with the accompanying drawings, will further illustrate the present invention. Detailed Implementation

[0026] The following embodiments are described to aid in understanding this application. These embodiments are not, and should not be construed as, limiting the scope of protection of this application.

[0027] In the following description, those skilled in the art will recognize that, throughout this discussion, various components or portions thereof may be divided into individual components or may be integrated together (including integration within a single system or component).

[0028] Furthermore, the connection between components or systems is not intended to be limited to a direct connection; on the contrary, data between these components may be modified, reformatted, or otherwise altered by intermediate components. Additionally, other or fewer connections may be used. It should also be noted that the terms "connection," "link," or "input" should be understood to include direct connections, indirect connections via one or more intermediate devices, and wireless connections.

[0029] Example 1

[0030] like Figure 1 The diagram shown is a schematic representation of the installation structure of a waterproof backflow device for gas pipelines according to the present invention; Figure 2 The diagram shown is a structural schematic of a waterproof backflow device for a gas pipeline according to the present invention; as shown... Figure 3 The image shown is a partially enlarged view of a waterproof backflow device for gas pipelines according to the present invention; as shown... Figure 4 The diagram shown is a structural schematic of a waterproof backflow device for a gas pipeline according to the present invention; as shown... Figure 5 The diagram shown is a partial structural schematic of a waterproof backflow device for gas pipelines according to the present invention.

[0031] A backflow prevention device for gas pipelines includes a gas riser 10, a gas main 20, and a backflow prevention device 30. The input end of the backflow prevention device 30 is connected to the output end of the gas main 20, and the output end of the backflow prevention device 30 is connected to the input end of the gas riser 10. The output end of the gas riser 10 is connected to a user unit. The backflow prevention device 30 is used to prevent water from flowing back into the gas main 20 from the user unit via the gas riser 10. The backflow prevention device 30 includes a pipe. The system comprises a pipe body 301, a water collection tank 302, and an annular float 303. The pipe body 301 and the water collection tank 302 are integrally formed. The input end of the pipe body 301 is connected to the main gas pipe 20, and the output end of the pipe body 301 is connected to the gas riser 10. The pipe body 301 has a tubular structure with a through hole 40 at the center of its bottom end. The top of the water collection tank 302 is open and connected to the through hole 40. The water collection tank 302 and the pipe body 301 form a collection system. A water chamber 50 is provided, and an annular float 303 is provided inside the water collection chamber 50. The density of the annular float 303 is less than that of water. A vertically penetrating flow channel 60 is opened on the annular float 303. The annular float 303 passes through the through hole 40. The top of the annular float 303 is symmetrically provided with locking blocks 70 on both sides. The top inner wall of the pipe body 301 is provided with a locking groove 80 corresponding to the position of the locking blocks 70. The top of the flow channel 60 is connected to the interior of the pipe body 301, and the bottom is connected to the... The water collection chamber 50 is connected. Under normal conditions, the annular float 303 is stationary in the water collection chamber 50. When water from the user unit flows back into the gas riser 10, the water flows through the gas riser 10 and the flow channel 60 in sequence into the water collection chamber 50. As the water level in the water collection chamber 50 rises, the annular float 303 rises synchronously until the locking block 70 engages with the locking groove 80, thus preventing the water from the user unit from flowing back into the gas main pipe 20 through the gas riser 10.

[0032] The diameter of the annular float 303 is smaller than the diameter of the through hole 40, and the diameter of the annular float 303 is equal to the diameter of the inner wall of the pipe body 301. The sum of the height of the annular float 303 and the height of the locking block 70 is greater than the diameter of the inner wall of the pipe body 301. When the locking block 70 is engaged with the locking groove 80, the lower part of the annular float 303 passes through the through hole 40, and the bottom end of the annular float 303 is flush with the bottom outer wall of the pipe body 301.

[0033] The annular float 303 is integrally formed with the locking block 70. The top of the locking block 70 is flush with the bottom inner wall of the pipe body 301. The lower two sides of the annular float 303 are symmetrically provided with outwardly extending protrusions 170. The protrusions 170 are integrally formed with the annular float 303. The protrusions 170 are used to abut against the outer wall of the pipe body 301 when the annular float 303 floats upward, so as to prevent the annular float 303 from disengaging from the through hole 40.

[0034] The annular float 303 has a hollow structure inside, which reduces weight. The annular float 303, the locking block 70 and the protrusion 170 are all made of PE or PP.

[0035] Both the protrusion 170 and the locking block 70 are connected to a sealing gasket 90. When the annular float 303 floats upward and the locking block 70 engages with the locking groove 80, the sealing effect is better under the sealing gasket 90, and the water flow will not flow back into the gas main pipe 20 along the gas riser 10. The sealing gasket 90 is made of silicone or rubber.

[0036] There is a first gap 100 between the protrusion 170 and the inner wall of the water collection tank 302, and there is a second gap 110 between the annular float 303 and the side wall of the through hole 40. The first gap 100 is used to prevent the protrusion 170 from interfering with the inner wall of the water collection tank 302 when it rises or resets, and the second gap 110 is used to prevent the annular float 303 from interfering with the side wall of the through hole 40 when it rises or resets.

[0037] The slot 80 is provided with an inclined first guide surface 120, and the block 70 is provided with a second guide surface 130 that is adapted to the first guide surface 120, so that the block 70 can be engaged with the slot 80.

[0038] The bottom of the water collection tank 302 is provided with a maintenance cap 140, which is threadedly connected to the water collection tank 302, making it convenient to clean the water inside the water collection tank 302 and to repair or replace the annular float 303.

[0039] Drainage holes 150 are provided on both sides of the pipe body 301 near the water collection tank 302 for cleaning the water remaining in the pipe body 301.

[0040] The top of the pipe body 301 is provided with an observation window 160, which is used by maintenance personnel to observe whether there is water accumulation in the water collection tank 302 or whether the annular float 303 is stuck, so as to facilitate timely maintenance.

[0041] Beneficial effects of the present invention: The present invention proposes a waterproof backflow device for gas pipelines, including a gas riser 10, a gas main 20, and a waterproof backflow device 30. The waterproof backflow device 30 includes a pipe body 301, a water collection tank 302, and an annular float 303. The pipe body 301 and the water collection tank 302 are integrally formed. The input end of the pipe body 301 is connected to the gas main 20, and the output end of the pipe body 301 is connected to the gas riser 10. The pipe body 301 has a tubular structure with a through hole 40 at the center of its bottom end. The top of the water collection tank 302 is open and connected to the through hole 40. The water collection tank 302 and the pipe body 301 enclose a water collection chamber 50. The annular float 303 is disposed in the water collection chamber 50. The density of the annular float 303 is less than that of water. The annular float 303 has a vertically penetrating flow channel 60. 3. The annular float 303 is symmetrically provided with locking blocks 70 on both sides of its top end, and the inner wall of the top of the pipe body 301 is provided with a locking groove 80 corresponding to the position of the locking blocks 70. The top end of the flow channel 60 is connected to the inside of the pipe body 301, and the bottom end is connected to the water collection chamber 50. With the provision of a waterproof backflow device 30, when water flows backflow, as the water level in the water collection chamber 50 rises, the annular float 303 rises synchronously until the locking blocks 70 engage with the locking grooves 80, thereby sealing and blocking the pipe body 301. The response is rapid, safe and reliable, and the overall structure is compact. The through hole 40 guides the floating of the annular float 303, ensuring a reliable seal. At the same time, when the water level in the water collection chamber 50 drops, the annular float 303 automatically falls back to its normal position under the action of gravity, and the device returns to the air-permeable state. No manual reset is required, it can be reused, and installation and maintenance are convenient.

[0042] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. A waterproof backflow device for gas pipelines, characterized in that: The system includes a gas riser (10), a gas main (20), and a waterproof backflow device (30). The waterproof backflow device (30) includes a pipe body (301), a water collection tank (302), and an annular float (303). The pipe body (301) and the water collection tank (302) are integrally formed. The input end of the pipe body (301) is connected to the gas main (20), and the output end of the pipe body (301) is connected to the gas riser (10). The pipe body (301) is a tubular structure with a through hole (40) at the center of its bottom end. The top of the water collection tank (302) is open and connected to the through hole (40). A water collection chamber (50) is formed by the pipe body (301). The annular float (303) is provided in the water collection chamber (50). The density of the annular float (303) is less than that of water. A vertically penetrating flow channel (60) is provided on the annular float (303). The annular float (303) passes through the through hole (40). The top of the annular float (303) is symmetrically provided with locking blocks (70) on both sides. The top inner wall of the pipe body (301) is provided with a locking groove (80) corresponding to the position of the locking block (70). The top of the flow channel (60) is connected to the inside of the pipe body (301), and the bottom is connected to the water collection chamber (50).

2. The waterproof backflow device for gas pipelines according to claim 1, characterized in that: The diameter of the annular float (303) is smaller than the diameter of the through hole (40), and the diameter of the annular float (303) is equal to the diameter of the inner wall of the pipe body (301). The sum of the height of the annular float (303) and the height of the locking block (70) is greater than the diameter of the inner wall of the pipe body (301). When the locking block (70) engages with the locking groove (80), the lower part of the annular float (303) passes through the through hole (40), and the bottom end of the annular float (303) is flush with the bottom outer wall of the pipe body (301).

3. The waterproof backflow device for gas pipelines according to claim 1, characterized in that: The annular float (303) and the locking block (70) are integrally formed. The top of the locking block (70) is flush with the bottom inner wall of the pipe body (301). The lower two sides of the annular float (303) are symmetrically provided with outwardly extending protrusions (170), and the protrusions (170) are integrally formed with the annular float (303).

4. The waterproof backflow device for gas pipelines according to claim 3, characterized in that: The annular float (303) has a hollow structure inside. The annular float (303), the locking block (70) and the protrusion (170) are all made of PE or PP.

5. The waterproof backflow device for gas pipelines according to claim 4, characterized in that: Both the protrusion (170) and the locking block (70) are connected to a sealing gasket (90), which is made of silicone or rubber.

6. The waterproof backflow device for gas pipelines according to claim 5, characterized in that: There is a first gap (100) between the protrusion (170) and the inner wall of the water collection tank (302), and there is a second gap (110) between the annular float (303) and the side wall of the through hole (40).

7. The waterproof backflow device for gas pipelines according to claim 1, characterized in that: The slot (80) is provided with an inclined first guide surface (120), and the block (70) is provided with a second guide surface (130) that is adapted to the first guide surface (120).

8. The waterproof backflow device for gas pipelines according to claim 7, characterized in that: The bottom of the water collection tank (302) is provided with a maintenance cap (140), which is threadedly connected to the water collection tank (302).

9. The waterproof backflow device for gas pipelines according to claim 8, characterized in that: Drainage holes (150) are provided on both sides of the pipe body (301) near the water collection tank (302).

10. The waterproof backflow device for gas pipelines according to claim 9, characterized in that: The top of the pipe body (301) is provided with an observation window (160).

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