A buried water meter and ground backflow preventer set

Abstract

The utility model discloses a kind of buried water meter and ground backflow preventer group, belong to municipal engineering industry pipeline technical field, including gate valve well, water meter well and backflow preventer group;The gate valve well and water meter well are all arranged below ground;The backflow preventer group is arranged on ground;Gate valve well and water meter well are respectively provided with meter front gate valve, water meter;The backflow preventer group includes backflow preventer;Meter front gate valve, water meter and backflow preventer are sequentially communicated by pipeline.The utility model of a kind of buried water meter and ground backflow preventer group can effectively solve the water meter well in prior art in construction site setting Because well room size is not enough, cause water meter before and after straight pipe length is not enough to lead to water meter measurement accuracy is not enough and other problems.

Description

Technical Field

[0001] This utility model belongs to the field of pipeline technology in the municipal engineering industry. Specifically, it relates to a buried water meter and a surface backflow prevention device assembly. Background Technology

[0002] Standard 05SS502, "Outdoor Water Supply Pipeline Ancillary Structures," page 136, specifies reinforced concrete rectangular water meter wells. The well's main equipment includes water meters, butterfly valves, check valves, expansion joints, and necessary connecting pipe fittings. To ensure metering accuracy, sufficiently long straight pipe sections are required before and after the water meter, resulting in a large well size. For example, for a DN200 water meter, the well length in standard 05SS502 is 2750mm, without any straight pipe sections before and after the meter. If this length were maintained, the well would be approximately 5.5 meters long. In actual construction, there is often insufficient space to accommodate such a large well, thus reducing the length of the straight pipe sections before and after the water meter. Utility Model Content

[0003] The purpose of this utility model is to address the aforementioned shortcomings by providing a buried water meter and a surface backflow prevention device assembly. This solves the problem in existing technologies where insufficient well size at construction sites leads to inadequate straight pipe lengths before and after the water meter, resulting in insufficient metering accuracy. To achieve the above objective, this utility model provides the following technical solution:

[0004] A buried water meter and a surface backflow prevention device assembly include a gate valve well, a water meter well, and a backflow prevention device assembly; the gate valve well and the water meter well are both located underground; the backflow prevention device assembly is located on the surface; the gate valve well and the water meter well are respectively equipped with a gate valve before the meter and a water meter; the backflow prevention device assembly includes a backflow prevention device; the gate valve before the meter, the water meter, and the backflow prevention device are connected in sequence through a pipeline.

[0005] Furthermore, both the front and rear ends of the gate valve are connected to short pipes with disc bearings, and the first ductile iron pipes are connected to the short pipes with disc bearings at both ends; the first ductile iron pipe at the front end of the gate valve passes through the gate valve well wall and connects to the water supply pipeline; the first ductile iron pipe at the rear end of the gate valve passes through the gate valve well wall and connects to the water meter.

[0006] Furthermore, the water meter is connected to a first double-disc short pipe at both the front and rear ends; the first double-disc short pipe at the front end of the water meter passes through the water meter well wall and is connected to a disc bearing short pipe, and is connected to the first ductile iron pipe at the rear end of the gate valve at the front end of the meter through the disc bearing short pipe; the first double-disc short pipe at the rear end of the water meter passes through the water meter well wall and extends to the ground through a bend assembly to connect to the backflow preventer.

[0007] Furthermore, a double-flange loose-sleeve force transmission compensation joint is provided between the rear end of the water meter and the first double-disc short pipe; a gate valve is also provided in the water meter well, located on the first double-disc short pipe at the rear end of the water meter.

[0008] Furthermore, the bend assembly sequentially includes a second ductile iron pipe, a first double-disc 90° elbow, a second double-disc short pipe, and a second double-disc 90° elbow; the front and rear ends of the second ductile iron pipe are respectively connected to disc-bearing short pipes, and the disc-bearing short pipes at the front and rear ends are respectively connected to the horizontal section of the first double-disc short pipe and the first double-disc 90° elbow at the rear end of the water meter; the vertical section of the first double-disc 90° elbow is connected to the second double-disc short pipe; the other end of the second double-disc short pipe is connected to the vertical section of the second double-disc 90° elbow; the horizontal section of the second double-disc 90° elbow is connected to the backflow preventer.

[0009] Furthermore, the front and rear ends of the backflow preventer are provided with a third double-disc short pipe, which is connected to the horizontal section of the second double-disc 90° elbow and the water supply pipe, respectively.

[0010] Furthermore, a Y-type filter is provided between the front end of the backflow preventer and the third double-disc short pipe.

[0011] Furthermore, a flexible rubber joint and a soft-seal gate valve are sequentially provided between the rear end of the backflow preventer and the third double-disc short pipe.

[0012] Furthermore, sealing structures are provided at the connection between the first ductile iron pipe and the gate valve well wall, and at the connection between the first double-disc short pipe and the water meter well wall.

[0013] Furthermore, the sealing structure includes polysulfide sealant and cement mortar disposed on both sides of the polysulfide sealant.

[0014] The beneficial effects of this utility model are:

[0015] This application discloses a buried water meter and a ground backflow prevention device assembly. The well is divided into two parts: a gate valve well at the front for valve inspection and maintenance, and a water meter well in the middle for easy inspection and maintenance of the water meter. The backflow prevention device is installed on the ground (indoor or outdoor ground, with a further backflow prevention device well installed on the outdoor ground for protection). This division of the entire well into sections and intervals reduces the volume of each individual well chamber, making it suitable for more construction scenarios. The straight sections before and after the water meter are located in the soil between adjacent wells, ensuring the length of the straight sections before and after the water meter and ensuring the accuracy of water meter measurement. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present utility model;

[0017] Figure 2 This is a schematic diagram of the structure of Embodiment 2 of the present invention;

[0018] Figure 3 This is a schematic diagram of the sealing structure of this utility model;

[0019] In the attached diagram: 1. Gate valve well; 2. Water meter well; 3. Backflow preventer well; 4. Gate valve before meter; 5. Water meter; 6. Backflow preventer; 7. First ductile iron pipe; 8. First double-disc short pipe; 9. Double flange loose-sleeve force transmission compensation joint; 10. Gate valve after meter; 11. Second ductile iron pipe; 12. First double-disc 90° elbow; 13. Second double-disc short pipe; 14. Second double-disc 90° elbow; 15. Third double-disc short pipe; 16. Y-type filter; 17. Flexible rubber joint; 18. Soft-seal gate valve; 19. Polysulfide sealant; 20. Cement mortar; 21. First plastic-lined composite steel pipe; 22. Second plastic-lined composite steel pipe; 23. First steel-plastic 90° elbow; 24. Third plastic-lined composite steel pipe; 25. Second steel-plastic 90° elbow; 26. Fourth plastic-lined composite steel pipe. Detailed Implementation

[0020] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed present invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0021] It should be noted that similar reference numerals and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the figures, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance. In addition, the terms "horizontal," "vertical," etc., do not indicate that the component is required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted. In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0022] Example 1:

[0023] See attached Figures 1-2This embodiment provides a buried water meter and a backflow prevention device assembly, including a gate valve well 1, a water meter well 2, and a backflow prevention device assembly, which are arranged sequentially at intervals. The gate valve well 1 and the water meter well 2 are located underground, while the backflow prevention device assembly is installed on the ground, either indoors or outdoors, to prevent it from being flooded. The gate valve well 1 and the water meter well 2 are respectively used to install a gate valve 4 and a water meter 5 before the meter. The backflow prevention device assembly includes a backflow prevention device 6, and the gate valve 4, the water meter 5, and the backflow prevention device 6 are connected sequentially through a pipeline. In this embodiment, taking a DN100-DN300 water meter well 2 as an example, a first ductile iron pipe 7 is installed at both ends of the gate valve 4 before and after the meter as the water pipe for flow. The ductile iron pipe has excellent mechanical properties, far exceeding those of ordinary cast iron pipes. Its flexible joint design can absorb the stress caused by foundation settlement or thermal expansion and contraction, reducing the risk of pipe rupture; it has strong corrosion resistance, is suitable for most soil environments, and has a long service life. The connection ports at both ends of the gate valve 4 before the meter are flange connections, and a disc bearing short pipe is further provided as an interface conversion with the first ductile iron pipe. The cast iron pipe 7 is connected to the water supply pipeline through the wall of the gate valve 4 at the front end of the meter. The first ductile iron pipe 7 at the rear end of the gate valve 4 passes through the wall of the gate valve well 1 and is connected to the water meter 5. A sealing structure is provided at the connection between the first ductile iron pipe 7 and the wall of the gate valve well 1. Specifically, it includes polysulfide sealant 19, which fills the gap between the first ductile iron pipe 7 and the wall of the gate valve well 1. Cement mortar 20 is then filled on both sides of the polysulfide sealant 19 for sealing, which can prevent the invasion of some insects and groundwater.

[0024] In this embodiment, the water meter 5 in the water meter well 2 is connected to the front and rear ends of a first double-disc short pipe 8. The first double-disc short pipe 8 at the front end of the water meter 5 passes through the wall of the water meter well 2 and connects to the first ductile iron pipe 7 at the rear end of the gate valve 4 via a conversion interface. The first double-disc short pipe 8 at the rear end of the water meter 5 passes through the wall of the water meter well 2 and extends to the ground via a bend assembly to connect to the backflow preventer 6. A double-flange loose-sleeve force transmission compensation joint 9 is provided between the rear end of the water meter 5 and the first double-disc short pipe 8. During installation, the compensation amount can be adjusted to adapt to the pipeline position deviation, ultimately forming a rigid connection to transmit the axial thrust (blind plate force) of the pipeline system and compensate for installation errors. By replacing the connecting bolts with force transmission screws, the equipment and pipeline are connected as a whole, effectively protecting the water meter 5 from damage. A gate valve 10 is also provided in the water meter well 2, located on the first double-disc short pipe 8 at the rear end of the water meter 5, for water shut-off during maintenance at different locations. The connection between the first double-disc short pipe 8 at the front and rear ends of the water meter 5 and the wall of the water meter well 2 is provided with the same sealing structure as that on the gate valve well 1 mentioned above.

[0025] In this embodiment, the bend assembly includes a second ductile iron pipe 11, a first double-disc 90° elbow 12, a second double-disc short pipe 13, and a second double-disc 90° elbow 14. The front and rear ends of the second ductile iron pipe 11 are respectively connected to disc-bearing short pipes, and the disc-bearing short pipes at the front and rear ends are respectively connected to the horizontal section of the first double-disc short pipe 8 and the first double-disc 90° elbow 12 at the rear end of the water meter 5. The vertical section of the first double-disc 90° elbow 12 is connected to the second double-disc short pipe 13. The second double-disc short pipe 13 is composed of multiple double-disc short pipes selected according to the actual height from the ground. The other end of the second double-disc short pipe 13 is connected to the vertical section of the second double-disc 90° elbow 14. The horizontal section of the second double-disc 90° elbow 14 is connected to the backflow preventer 6.

[0026] In this embodiment, the backflow preventer 6 can be installed on the ground indoors or outdoors. On the outdoor ground, a backflow preventer well 3 can be installed depending on the specific situation; this embodiment uses a backflow preventer well 3 as an example. The front and rear ends of the backflow preventer 6 are connected to a third double-disc short pipe 15. The front end of the third double-disc short pipe 15 passes through the wall of the backflow preventer well 3 and connects to the horizontal section of the second double-disc 90° elbow 14. The rear end of the third double-disc short pipe 15 passes through the wall of the backflow preventer well 3 and connects to the water supply pipe to the user. The connection between the third double-disc short pipe 15 and the wall of the backflow preventer well 3 also has the same sealing structure as that on the gate valve well 1. The backflow preventer 6 prevents backflow of water in the pipeline, thus preventing contamination. A Y-type filter 16 is installed between the front end of the backflow preventer 6 and the third double-disc short pipe 15 to filter impurities in the fluid. A flexible rubber joint 17 is installed between the rear end of the backflow preventer 6 and the third double-disc short pipe 15 to compensate for the deformation of the pipeline caused by thermal expansion and contraction or foundation settlement, ensuring system stability and effectively alleviating stress concentration, protecting the pipeline system from damage. A soft-seal gate valve 18 is connected to the rear end of the flexible rubber joint 17 to cut off the water flow, completing the water shut-off function during maintenance of different parts. The soft-seal gate valve 18 utilizes the compensation effect of slight deformation of the elastic gate plate to achieve a good sealing effect. A drain pipe can be installed in the backflow preventer well 3 to prevent water accumulation and submersion of the backflow preventer 6.

[0027] Example 2:

[0028] See attached Figures 1-2In this embodiment, taking a DN40-DN50 water meter well 2 as an example, the front and rear ends of the pre-meter gate valve 4 can be directly connected to the first plastic-lined composite steel pipe 21. The first plastic-lined composite steel pipe 21 at the front end of the pre-meter gate valve 4 passes through the wall of the gate valve well 1 and connects to the water supply pipeline. The first plastic-lined composite steel pipe 21 at the rear end passes through the wall of the gate valve well 1 and the wall of the water meter well 2 and connects to the front end of the water meter 5. The rear end of the water meter 5 passes through the wall of the water meter well 2 via the second plastic-lined composite steel pipe 22 and is connected to the backflow preventer 6 on the ground via a bend assembly. A post-meter gate valve 10 is also provided in the water meter well 2, located on the second plastic-lined composite steel pipe 22 at the rear end of the water meter 5, for water shut-off during maintenance at different locations.

[0029] The pipe bending assembly in this embodiment includes a first steel-plastic 90° elbow 23, a third plastic-lined composite steel pipe 24, and a second steel-plastic 90° elbow 25. The second plastic-lined composite steel pipe 22 at the rear end of the water meter 5 passes through the wall of the water meter well 2 and is connected to the horizontal section of the first steel-plastic 90° elbow 23. The vertical section of the first steel-plastic 90° elbow 23 is connected to the third plastic-lined composite steel pipe 24. The other end of the third plastic-lined composite steel pipe 24 extends to the ground and is connected to the vertical section of the second steel-plastic 90° elbow 25. The horizontal section of the second plastic-lined composite steel pipe 22 is connected to the backflow preventer 6.

[0030] In this embodiment, the backflow preventer 6 can be installed on the ground indoors or outdoors. On the outdoor ground, a backflow preventer well 3 can be installed depending on the specific situation; this embodiment uses a backflow preventer well 3 as an example. The front and rear ends of the backflow preventer 6 are connected to a fourth plastic-lined composite steel pipe 26. The front end of the fourth plastic-lined composite steel pipe 26 passes through the wall of the backflow preventer well 3 and connects to the horizontal section of the second steel-plastic 90° elbow 25. The rear end of the fourth plastic-lined composite steel pipe 26 passes through the wall of the backflow preventer well 3 and connects to the water supply pipeline to the user. The backflow preventer 6 prevents water from flowing back into the pipeline, thus preventing contamination. A Y-type filter 16 is installed between the front end of the backflow preventer 6 and the fourth plastic-lined composite steel pipe 26 to filter impurities in the fluid. A flexible rubber joint 17 is installed between the rear end of the backflow preventer 6 and the fourth plastic-lined composite steel pipe 26 to compensate for deformation of the pipeline caused by thermal expansion and contraction or foundation settlement, ensuring system stability and effectively alleviating stress concentration, protecting the pipeline system from damage. A gate valve is connected to the rear end of the flexible rubber joint 17 to cut off the water flow and provide water shut-off during maintenance of different parts. A drain pipe is installed in the backflow preventer well 3 to prevent water accumulation and submersion of the backflow preventer 6.

[0031] In this embodiment, the connection points of the first plastic-lined composite steel pipe 21 with the gate valve well 1 wall and the water meter well 2 wall, the connection points of the second plastic-lined composite steel pipe 22 with the water meter well 2 wall, and the connection points of the fourth plastic-lined composite steel pipe 26 with the backflow preventer well 3 wall are all provided with sealing structures as in Embodiment 1.

[0032] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural or procedural transformations made based on the content of the present utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present utility model.

Claims

1. A buried water meter and a surface backflow prevention device assembly, characterized in that: It includes a gate valve well (1), a water meter well (2), and a backflow preventer assembly; the gate valve well (1) and the water meter well (2) are both located underground; the backflow preventer assembly is located on the ground; the gate valve well (1) and the water meter well (2) are respectively equipped with a gate valve (4) and a water meter (5); the backflow preventer assembly includes a backflow preventer (6); the gate valve (4), the water meter (5), and the backflow preventer (6) are connected in sequence through a pipeline.

2. The buried water meter and surface backflow prevention device assembly according to claim 1, characterized in that: The front and rear ends of the gate valve (4) are connected to short pipes with disc bearings, and the first ductile iron pipe (7) is connected to the short pipes with disc bearings at both ends; the first ductile iron pipe (7) at the front end of the gate valve (4) passes through the wall of the gate valve well (1) and connects to the water supply pipeline; the first ductile iron pipe (7) at the rear end of the gate valve (4) passes through the wall of the gate valve well (1) and connects to the water meter (5).

3. The buried water meter and surface backflow prevention device assembly according to claim 2, characterized in that: The water meter (5) is connected to a first double-disc short pipe (8) at both the front and rear ends; the first double-disc short pipe (8) at the front end of the water meter (5) passes through the wall of the water meter well (2) and is connected to a disc bearing short pipe, and is connected to the first ductile iron pipe (7) at the rear end of the gate valve (4) in front of the meter through the disc bearing short pipe; the first double-disc short pipe (8) at the rear end of the water meter (5) passes through the wall of the water meter well (2) and extends to the ground through the bend assembly to connect to the backflow preventer (6).

4. The buried water meter and surface backflow prevention device assembly according to claim 3, characterized in that: A double-flange loose-sleeve force transmission compensation joint (9) is provided between the rear end of the water meter (5) and the first double-disc short pipe (8); a gate valve (10) is also provided in the water meter well (2), which is located on the first double-disc short pipe (8) at the rear end of the water meter (5).

5. The buried water meter and surface backflow prevention device assembly according to claim 3, characterized in that: The bend assembly sequentially includes a second ductile iron pipe (11), a first double-disc 90° elbow (12), a second double-disc short pipe (13), and a second double-disc 90° elbow (14); the front and rear ends of the second ductile iron pipe (11) are respectively connected to disc-bearing short pipes, and the disc-bearing short pipes at the front and rear ends are respectively connected to the horizontal section of the first double-disc short pipe (8) and the first double-disc 90° elbow (12) at the rear end of the water meter (5); the vertical section of the first double-disc 90° elbow (12) is connected to the second double-disc short pipe (13); the other end of the second double-disc short pipe (13) is connected to the vertical section of the second double-disc 90° elbow (14); the horizontal section of the second double-disc 90° elbow (14) is connected to the backflow preventer (6).

6. A buried water meter and surface backflow prevention device assembly according to claim 5, characterized in that: The backflow preventer (6) is provided with a third double-disc short pipe (15) at the front and rear ends, which are respectively connected to the horizontal section of the second double-disc 90° elbow (14) and the water supply pipe.

7. A buried water meter and surface backflow prevention device assembly according to claim 6, characterized in that: A Y-type filter (16) is provided between the front end of the backflow preventer (6) and the third double-disc short pipe (15).

8. A buried water meter and a surface backflow prevention device assembly according to claim 6, characterized in that: A flexible rubber joint (17) and a soft-seal gate valve (18) are sequentially provided between the rear end of the backflow preventer (6) and the third double-disc short pipe (15).

9. A buried water meter and a surface backflow prevention device assembly according to claim 3, characterized in that: The connection between the first ductile iron pipe (7) and the wall of the gate valve well (1), and the connection between the first double-disc short pipe (8) and the wall of the water meter well (2) are both provided with sealing structures.

10. A buried water meter and a surface backflow prevention device assembly according to claim 9, characterized in that: The sealing structure includes polysulfide sealant (19) and cement mortar (20) disposed on both sides of the polysulfide sealant (19).

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