Backflow prevention stop valve

Abstract

The utility model provides an anti-backflow stop valve, which relates to the technical field of valves, and comprises a stop valve main body, the top end of the stop valve main body is provided with an extension structure, the extension structure comprises an extension pipe, the inner wall of the extension pipe is fixedly connected with a support ring, the outer surface of the support ring is fixedly connected with a clamping ring, and the clamping ring is fixedly connected with the stop valve main body. A first flange is arranged on one side of the stop valve body, and a second flange is fixedly connected to one side of the first flange. According to the anti-backflow stop valve, the extension structure is arranged, so that a structure for preventing backflow is conveniently arranged, and due to the fact that an inner cavity of the water inlet and outlet position of an original stop valve body is limited, the liquid speed may be affected by excessive structures; by arranging the backflow preventing assembly, the effect of preventing backflow in the extending structure can be achieved, specifically, the inlaid plate is arranged to serve as the supporting end of the backflow preventing assembly, and by arranging the connecting rod, on one hand, stretching and retracting of the spring are protected, and on the other hand, movement of the sliding plate is supported.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, and in particular to a backflow prevention shut-off valve. Background Technology

[0002] As a key component of fluid control systems, gate valves play an irreplaceable role in modern industry and people's lives. In the petrochemical industry, gate valves are used to precisely control the transportation of petroleum, chemical raw materials and products. In water supply and drainage systems, gate valves can effectively control the flow of water, ensuring water safety and rational allocation. In the field of gas transmission, gate valves are an important barrier to ensure the safe transportation and use of gas.

[0003] Currently, most gate valves on the market have basic shut-off functions, but they are insufficient in preventing backflow. Some gate valves use a simple one-way valve structure to prevent backflow. However, this structure has poor sealing performance when the medium pressure fluctuates greatly, and medium backflow is likely to occur, affecting the normal operation of the system and the safety of the equipment. Some gate valves use more complex anti-backflow structures, but the structural design is unreasonable, resulting in greater resistance when the valve is opened and closed. This not only increases the difficulty of operation, but also reduces the service life of the valve. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing technologies, such as inadequacy in preventing backflow, and to provide a backflow-preventing shut-off valve.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a backflow prevention shut-off valve, comprising a shut-off valve body, an extension structure provided at the top of the shut-off valve body, the extension structure comprising an extension tube, a support ring fixedly connected to the inner wall of the extension tube, a locking ring fixedly connected to the outer surface of the support ring, a first flange provided on one side of the shut-off valve body, a second flange fixedly connected to one side of the first flange, an anti-backflow component provided on the outer surface of the second flange, the anti-backflow component comprising an insert plate, a support plate fixedly connected inside the insert plate, a connecting rod fixedly connected to the outer surface of the support plate, a spring provided on the outer surface of the connecting rod, a sliding plate fixedly connected to the top of the spring, an anti-backflow plate fixedly connected to the outer surface of the sliding plate, and a locking outer frame fixedly connected to the top of the anti-backflow plate.

[0006] In a preferred embodiment, the outer surface of the second flange is provided with a locking groove, and a placement groove is provided on one side of the locking groove. A limit block is fixedly connected to the outer surface of the inlay plate.

[0007] In a preferred embodiment, the inner wall of the engaging groove is engaged with the outer surface of the limiting block, and the inner wall of the placement groove is engaged with the outer surface of the inlay plate.

[0008] In a preferred embodiment, one side of the extension pipe is fixedly connected to the outlet end of the shut-off valve body.

[0009] In a preferred embodiment, the outer surface of the support plate is fixedly connected to the top of the spring.

[0010] In a preferred embodiment, the outer surface of the slide plate is movable to the outer surface of the connecting rod through a through hole.

[0011] In a preferred embodiment, the engaging outer frame engages with the outer surface of the engaging ring.

[0012] Compared with the prior art, the advantages and positive effects of this utility model are as follows:

[0013] This invention, by incorporating an extended structure, facilitates the installation of an anti-backflow mechanism. This is because the original shut-off valve body has limited internal space at the inlet and outlet, and excessive structural intervention could affect the liquid velocity. The anti-backflow component, installed within the extended structure, prevents backflow. Specifically, an inlaid plate serves as the support end of the anti-backflow component, and a connecting rod protects the spring's extension and retraction while providing support for the sliding plate's movement. The through-hole inside the sliding plate allows it to move stably on the outer surface of the connecting rod; when the shut-off valve body is open, the liquid pressure pushes the sliding plate across the connecting rod's outer surface. Furthermore, when the shut-off valve body is closed, the spring supports the anti-backflow plate, locking it against the outer surface of the retaining ring, preventing backflow of liquid on the other side. Attached Figure Description

[0014] Figure 1 A schematic diagram of the structure of a backflow prevention shut-off valve provided by this utility model.

[0015] Figure 2 This is a disassembly diagram of the flange structure of a backflow prevention shut-off valve provided by this utility model.

[0016] Figure 3 This is a structural disassembly diagram of the anti-backflow component of an anti-backflow shut-off valve provided by this utility model.

[0017] Figure 4 A schematic diagram of the backflow prevention component of a shut-off valve provided by this utility model.

[0018] Legend:

[0019] 1. Gate valve body; 2. Extension structure; 3. First flange; 4. Second flange; 5. Engagement groove; 6. Anti-backflow assembly;

[0020] 2. Extension structure; 21. Extension tube; 22. Support ring; 23. Engaging ring;

[0021] 6. Anti-backflow assembly; 61. Inlay plate; 62. Limiting block; 63. Support plate; 64. Connecting rod; 65. Spring; 66. Slide plate; 67. Anti-backflow plate; 68. Snap-fit ​​outer frame. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] Example 1

[0024] like Figures 1-4 As shown, this utility model provides a technical solution: a backflow prevention shut-off valve, including a shut-off valve body 1, an extension structure 2 at the top of the shut-off valve body 1, the extension structure 2 including an extension pipe 21, one side of the extension pipe 21 being fixedly connected to the outlet end of the shut-off valve body 1, a support ring 22 being fixedly connected to the inner wall of the extension pipe 21, a locking ring 23 being fixedly connected to the outer surface of the support ring 22, a first flange 3 being provided on one side of the shut-off valve body 1, a second flange 4 being fixedly connected to one side of the first flange 3, and an anti-backflow assembly 6 being provided on the outer surface of the second flange 4. Component 6 includes an inlay plate 61, a support plate 63 is fixedly connected inside the inlay plate 61, the outer surface of the support plate 63 is fixedly connected to the top of the spring 65, a connecting rod 64 is fixedly connected to the outer surface of the support plate 63, a spring 65 is provided on the outer surface of the connecting rod 64, a slide plate 66 is fixedly connected to the top of the spring 65, the outer surface of the slide plate 66 moves through a through hole to the outer surface of the connecting rod 64, an anti-backflow plate 67 is fixedly connected to the outer surface of the slide plate 66, a locking outer frame 68 is fixedly connected to the top of the anti-backflow plate 67, and the locking outer frame 68 locks onto the outer surface of the locking ring 23.

[0025] In this embodiment, the extension structure 2 facilitates the installation of an anti-backflow structure. This is because the internal cavity of the original shut-off valve body 1 at the water inlet and outlet positions is limited, and inserting too many structures may affect the liquid velocity. By setting the anti-backflow component 6, the backflow can be prevented in the extension structure 2. Specifically, the inlay plate 61 is set as the support end of the anti-backflow component 6, and the connecting rod 64 is set to protect the extension and contraction of the spring 65 and provide support for the movement of the slide plate 66. The through hole set inside the slide plate 66 allows the slide plate 66 to be stably mounted on the outer surface of the connecting rod 64. When the valve body 1 is opened, the pressure of the liquid pushes the slide plate 66 to move on the outer surface of the connecting rod 64. When the valve body 1 is closed, the spring 65 supports the anti-backflow plate 67 to be locked on the outer surface of the locking ring 23, and the liquid on the other side will not flow back due to the presence of the anti-backflow plate 67. When the pressure of the liquid pushes the slide plate 66 to move on the outer surface of the connecting rod 64, the spring 65 will be compressed, the slide plate 66 moves on the outer surface of the connecting rod 64, and the locking frame 68 at the top of the anti-backflow plate 67 will disengage from the locking ring 23 at the support ring 22, allowing water to flow through.

[0026] Example 2

[0027] like Figure 2 As shown, the outer surface of the second flange 4 is provided with a locking groove 5, and a placement groove is provided on one side of the locking groove 5. A limiting block 62 is fixedly connected to the outer surface of the inlay plate 61. The inner wall of the locking groove 5 is locked to the outer surface of the limiting block 62, and the inner wall of the placement groove is locked to the outer surface of the inlay plate 61.

[0028] In this embodiment, in order to make the anti-backflow component 6 removable and easy to install, three engaging grooves 5 are provided on the outer surface of the second flange 4. By cooperating with the placement groove, the insert plate 61 and the limiting block 62 are locked between the second flange 4 and the first flange 3, without hindering the connection between the two flanges. The limiting block 62 is provided to prevent the anti-backflow component 6 from rotating in the extension pipe 21.

[0029] Working principle:

[0030] like Figures 1-4As shown, when installing the anti-backflow shut-off valve, the insert plate 61 and the limiting block 62 are engaged in the three engaging grooves 5 and the placement groove between the second flange 4 and the first flange 3, and the second flange 4 and the first flange 3 are then fixed together with bolts. When the shut-off valve body 1 is opened, the pressure of the liquid pushes the slide plate 66 to move on the outer surface of the connecting rod 64, and the spring 65 is compressed. The slide plate 66 moves on the outer surface of the connecting rod 64, and the engaging outer frame 68 at the top of the anti-backflow plate 67 disengages from the engaging ring 23 at the support ring 22, allowing water to flow through. When the shut-off valve body 1 is closed, the spring 65 can support the anti-backflow plate 67 to be engaged on the outer surface of the engaging ring 23, preventing the liquid in the pipe from flowing back.

[0031] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present utility model without departing from the technical solution of the present utility model shall still fall within the protection scope of the technical solution of the present utility model.

Claims

1. A backflow prevention shut-off valve, comprising a shut-off valve body (1), characterized in that: An extension structure (2) is provided at the top of the shut-off valve body (1). The extension structure (2) includes an extension tube (21). A support ring (22) is fixedly connected to the inner wall of the extension tube (21). A retaining ring (23) is fixedly connected to the outer surface of the support ring (22). A first flange (3) is provided on one side of the shut-off valve body (1). A second flange (4) is fixedly connected to one side of the first flange (3). An anti-backflow component (6) is provided on the outer surface of the second flange (4). The anti-backflow assembly (6) includes an insert plate (61), a support plate (63) is fixedly connected inside the insert plate (61), a connecting rod (64) is fixedly connected to the outer surface of the support plate (63), a spring (65) is provided on the outer surface of the connecting rod (64), a sliding plate (66) is fixedly connected to the top of the spring (65), an anti-backflow plate (67) is fixedly connected to the outer surface of the sliding plate (66), and a locking outer frame (68) is fixedly connected to the top of the anti-backflow plate (67).

2. The backflow prevention shut-off valve according to claim 1, characterized in that: The outer surface of the second flange (4) is provided with a locking groove (5), and a placement groove is provided on one side of the locking groove (5). A limit block (62) is fixedly connected to the outer surface of the inlay plate (61).

3. The backflow prevention shut-off valve according to claim 2, characterized in that: The inner wall of the engagement groove (5) and the outer surface of the limiting block (62) are engaged and connected, and the inner wall of the placement groove and the outer surface of the inlay plate (61) are engaged and connected.

4. The backflow prevention shut-off valve according to claim 1, characterized in that: One side of the extension pipe (21) is fixedly connected to the outlet end of the shut-off valve body (1).

5. The backflow prevention shut-off valve according to claim 1, characterized in that: The outer surface of the support plate (63) is fixedly connected to the top of the spring (65).

6. The backflow prevention shut-off valve according to claim 1, characterized in that: The outer surface of the sliding plate (66) is movable to the outer surface of the connecting rod (64) through a through hole.

7. The backflow prevention shut-off valve according to claim 1, characterized in that: The engaging outer frame (68) engages with the outer surface of the engaging ring (23).

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