Check valve capable of preventing backflow pollution

Abstract

The utility model relates to the field of valve manufacturing, and discloses a check valve capable of preventing backflow pollution, which comprises a valve body, pipelines penetrate through the left end and the right end of the valve body, two fixing blocks are fixedly connected to the inner wall of the pipeline on the left side, a second rotating shaft is rotatably connected to the inner walls of the fixing blocks, and a baffle is connected to the outer wall of the second rotating shaft through a reset assembly. A connecting block is fixedly connected to the bottom end of the baffle, a first rotating shaft is rotatably connected to the inner wall of the connecting block, the outer wall of the first rotating shaft is fixedly connected to the inner wall of the second rotating seat, an upper cavity is formed in the top end of the valve body in a penetrating mode, and a guide rod is connected to the inner wall of the upper cavity through a limiting assembly. According to the utility model, the threaded rod is rotated by rotating the hand wheel, so that the connecting block slides on the guide rod, and when the baffle is opened under the impact of water flow, the baffle touches the limiting rod to limit the opening degree of the limiting rod, so that the flow of the water flow in a pipeline is controlled, and the flow in the valve body can be adjusted by controlling the height of the limiting rod under the condition that the water pressure is not changed.

Description

Technical Field

[0001] The utility model relates to the field of valve manufacturing, in particular to a check valve for preventing backflow pollution. Background Art

[0002] A check valve, also known as a one-way valve or a non-return valve, is an automatic valve whose function is to only allow fluid to flow unidirectionally and prevent fluid backflow. Check valves are widely used in pipeline systems to ensure that the medium (such as water, oil, gas, etc.) can only flow in the designed direction and prevent pressure backflow in the system.

[0003] After retrieval, for the double check valve backflow preventer with the publication number CN210069048U, the upper valve body, the lower valve body and the meter interface are hermetically and fixedly connected and communicated in sequence from top to bottom. There are two check valve assemblies, and the two check valve assemblies are respectively fixedly connected in the upper valve body and the lower valve body. An outer side surface of each of the two check valve assemblies is fixedly connected with a sealing ring, and outer circles of the two sealing rings are respectively fixedly connected to inner walls of the upper valve body and the lower valve body. The utility model has the following advantages: 1. Backflow prevention: Double insurance. When the pressure is less than 1.1MP, the check valve assembly automatically closes, and when it is greater than 1.1MP, the check valve assembly automatically opens. 2. Pollution prevention: Double sealing is realized. After the check valve assembly automatically closes, the fluid will not backflow and overflow from the gap. 3. Standardized module design: Under the condition of ensuring structural strength, the structure is simple and the space is fully utilized. It is connected to the water meter by a flexible joint, and the installation is convenient. 4. It is universal before and after the meter;

[0004] Based on the above patent, when the fluid pressure outside the meter interface is greater than 1.1MP, it will squeeze the inlet valve plate on the lower check valve assembly, the inlet valve plate slides upward, the spring is compressed, and the fluid flows out from the outlet through hole, and then acts on the upper check valve assembly. When the fluid pressure outside the meter interface is less than 1.1MP, under the elastic force of the spring, a downward pressure will be given to the inlet valve plate, so that the inlet valve plate tightly abuts against the retaining ring, thereby cutting off the fluid and making the check valve assembly in a closed state to prevent fluid backflow. However, this valve body cannot adjust the flow rate under a stable fluid pressure, and can only increase the flow rate of the valve body by changing the fluid pressure to increase the flow velocity, which is easy to damage the valve body. Summary of the Utility Model

[0005] The purpose of the utility model is to solve the disadvantages existing in the prior art, and to propose a check valve for preventing backflow pollution, which can control the water flow rate inside under a certain water pressure.

[0006] To achieve the above purpose, the utility model provides the following technical solutions:

[0007] A check valve for preventing backflow pollution, including a valve body. Pipes are penetrated through both the left and right ends of the valve body. Two fixing blocks are fixedly connected to the inner wall of the left pipe. A second rotating shaft is rotatably connected to the inner wall of the fixing block. A baffle is connected to the outer wall of the second rotating shaft through a reset assembly. A connecting block is fixedly connected to the bottom end of the baffle. A first rotating shaft is rotatably connected to the inner wall of the connecting block. The outer wall of the first rotating shaft is fixedly connected to the inner wall of a second rotating seat. An upper cavity is penetrated through the top end of the valve body. A guide rod is connected to the inner wall of the upper cavity through a limiting assembly.

[0008] Through the above technical solution, the backflow of the liquid inside the valve body can be prevented. At the same time, when the water pressure remains unchanged, the height of the limiting rod can be changed by rotating the handwheel to control the flow rate inside the valve body.

[0009] Further, the reset assembly includes a sleeve fixedly connected to the outer wall of the second rotating shaft. A spring is fixedly connected to the inner wall of the sleeve. The other end of the spring is fixedly connected to a sliding rod. A third rotating shaft is rotatably connected to the inner wall of the sliding rod. A first rotating seat is fixedly connected to the outer wall of the third rotating shaft. The right end of the first rotating seat is slidably connected to the left end of the baffle.

[0010] Through the above technical solution, when the pressure on the left side of the baffle is greater than that on the right side, the water flow will push the baffle to rotate on the second rotating seat so that the water flow can enter the valve body. At the same time, when the baffle rotates, it will drive the first rotating seat to slide on its outer wall, pull the sliding rod to slide inside the sleeve and stretch the spring, and cooperate with the fixing block to make the sleeve rotate. When the pressure on the left side of the baffle is less than that on the right side, the spring will contract and reset to drive the sliding rod to retract, so that the baffle will block the left pipe again under the pull of the sliding rod. At this time, the backflow of the water flow on the right side of the pipe can be prevented.

[0011] Further, the limiting assembly includes a threaded rod rotatably connected to the inner wall of the upper cavity. A handwheel is fixedly connected to the top end of the threaded rod. A limiting rod is threadedly connected to the outer wall of the threaded rod. The inner wall of the limiting rod is slidably connected to the outer wall of the guide rod.

[0012] Through the above technical solution, by rotating the handwheel to make the threaded rod rotate, the connecting block slides on the guide rod. When the baffle is opened by the impact of the water flow, it will touch the limiting rod to limit its opening degree, thereby controlling the flow rate of the water flow in the pipe. By controlling the height of the limiting rod, the flow rate inside the valve body can be adjusted when the water pressure remains unchanged.

[0013] Further, the bottom end of the second rotating seat is fixedly connected to the inner wall of the valve body.

[0014] Through the above technical solution, the valve body is used to install the second rotating seat.

[0015] Further, the outer wall of the sliding rod is slidably connected to the inner wall of the sleeve.

[0016] Through the above technical solution, the sliding rod is installed by means of a sleeve.

[0017] Further, the left end of the baffle is arranged at the right end of the left pipeline;

[0018] Through the above technical solution, the baffle is installed by means of a pipeline.

[0019] Further, the bottom end of the threaded rod is rotatably connected to the inner wall of the valve body, and the bottom end of the guide rod is fixedly connected to the inner wall of the valve body;

[0020] Through the above technical solution, the threaded rod and the guide rod are installed by means of the valve body.

[0021] The utility model has the following beneficial effects:

[0022] 1. In the utility model, through the cooperation of the limit rod, the upper cavity, the threaded rod, the handwheel and the guide rod, the check valve can control the water flow rate inside it under a certain water pressure. Description of the Drawings

[0023] Figure 1 It is a perspective view of the check valve for preventing backflow pollution proposed by the utility model;

[0024] Figure 2 It is a sectional view of the valve body in the check valve for preventing backflow pollution proposed by the utility model;

[0025] Figure 3 It is a sectional view of the sleeve in the check valve for preventing backflow pollution proposed by the utility model.

[0026] Legend Explanation:

[0027] 1. Valve body; 2. Pipeline; 3. Upper cavity; 4. Threaded rod; 5. Handwheel; 6. Baffle; 7. Rotating seat one; 8. Sleeve; 9. Fixed block; 10. Connecting block; 11. Rotating seat two; 12. Rotating shaft one; 13. Limit rod; 14. Guide rod; 15. Sliding rod; 16. Spring; 17. Rotating shaft two; 18. Rotating shaft three. Detailed Embodiment

[0028] Next, the technical solutions in the embodiments of the utility model will be clearly and completely described in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only a part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the utility model.

[0029] Refer to Figures 1-3, An embodiment provided by the present utility model: A check valve for preventing backflow pollution, including a valve body 1. Pipes 2 are penetrated through both the left and right ends of the valve body 1. Two fixed blocks 9 are fixedly connected to the inner wall of the left pipe 2. A second rotating shaft 17 is rotatably connected to the inner wall of the fixed block 9. A sleeve 8 is fixedly connected to the outer wall of the second rotating shaft 17. A spring 16 is fixedly connected to the inner wall of the sleeve 8. The other end of the spring 16 is fixedly connected to a sliding rod 15. The outer wall of the sliding rod 15 is slidably connected to the inner wall of the sleeve 8. A third rotating shaft 18 is rotatably connected to the inner wall of the sliding rod 15. A first rotating seat 7 is fixedly connected to the outer wall of the third rotating shaft 18. The right end of the first rotating seat 7 is slidably connected to the left end of a baffle 6. The left end of the baffle 6 is arranged at the right end of the left pipe 2. A connecting block 10 is fixedly connected to the bottom end of the baffle 6. A first rotating shaft 12 is rotatably connected to the inner wall of the connecting block 10. The outer wall of the first rotating shaft 12 is fixedly connected to the inner wall of a second rotating seat 11. The bottom end of the second rotating seat 11 is fixedly connected to the inner wall of the valve body 1;

[0030] Specifically, when the pressure on the left side of the baffle 6 is greater than that on its right side, the water flow will push the baffle 6 to rotate on the second rotating seat 11 so that the water flow can enter the valve body 1. At the same time, when the baffle 6 rotates, it will drive the first rotating seat 7 to slide on its outer wall, pull the sliding rod 15 to slide in the inner wall of the sleeve 8 and stretch the spring 16, and cooperate with the fixed block 9 to make the sleeve 8 rotate. When the pressure on the left side of the baffle 6 is less than that on the right side, the spring 16 will contract and reset to drive the sliding rod 15 to retract, so that the baffle 6 will block the left pipe 2 again under the pull of the sliding rod 15. At this time, the backflow of the water flow on the right side of the pipe 2 can be prevented.

[0031] An upper cavity 3 is penetrated through the top end of the valve body 1. A threaded rod 4 is rotatably connected to the inner wall of the upper cavity 3. A handwheel 5 is fixedly connected to the top end of the threaded rod 4. A limiting rod 13 is threadedly connected to the outer wall of the threaded rod 4. The inner wall of the limiting rod 13 is slidably connected to the outer wall of a guiding rod 14. The bottom end of the threaded rod 4 is rotatably connected to the inner wall of the valve body 1. The bottom end of the guiding rod 14 is fixedly connected to the inner wall of the valve body 1;

[0032] Specifically, by rotating the handwheel 5 to make the threaded rod 4 rotate, the connecting block 10 slides on the guiding rod 14. When the baffle 6 is opened by the impact of the water flow, it will touch the limiting rod 13 to limit its opening degree, thereby controlling the flow rate of the water flow in the pipe 2. By controlling the height of the limiting rod 13, the flow rate inside the valve body 1 can be adjusted under the condition of constant water pressure.

[0033] Working principle: When the pressure on the left side of the baffle 6 is greater than that on the right side, the water flow will push the baffle 6 to rotate on the second rotating seat 11 so that the water flow can enter the valve body 1. At the same time, when the baffle 6 rotates, it will drive the first rotating seat 7 to slide on its outer wall, pull the sliding rod 15 to slide on the inner wall of the sleeve 8 and stretch the spring 16, and cooperate with the fixed block 9 to make the sleeve 8 rotate. When the pressure on the left side of the baffle 6 is less than that on the right side, the spring 16 will contract and reset to drive the sliding rod 15 to retract, so that the baffle 6 will block the left pipeline 2 again under the pull of the sliding rod 15. At this time, the reverse flow of the water flow on the right side of the pipeline 2 can be prevented. By rotating the handwheel 5, the threaded rod 4 rotates, so that the connecting block 10 slides on the guide rod 14. When the baffle 6 is opened by the impact of the water flow, it will touch the limit rod 13 to limit its opening degree, thereby controlling the water flow rate in the pipeline 2. By controlling the height of the limit rod 13, the flow rate inside the valve body 1 can be adjusted under the condition of constant water pressure.

[0034] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A check valve for preventing backflow contamination, comprising a valve body (1), characterized in that: The valve body (1) is provided with pipes (2) at both left and right ends. The inner wall of the left pipe (2) is fixedly connected to two fixed blocks (9). The inner wall of the fixed block (9) is rotatably connected to a second rotating shaft (17). The outer wall of the second rotating shaft (17) is connected to a baffle (6) via a reset assembly. The bottom end of the baffle (6) is fixedly connected to a connecting block (10). The inner wall of the connecting block (10) is rotatably connected to a first rotating shaft (12). The outer wall of the first rotating shaft (12) is fixedly connected to the inner wall of the second rotating seat (11). An upper cavity (3) is provided at the top end of the valve body (1). The inner wall of the upper cavity (3) is connected to a guide rod (14) via a limit assembly.

2. The check valve for preventing backflow pollution according to claim 1, characterized in that: The reset assembly comprises a sleeve (8) fixedly connected to the outer wall of the second rotating shaft (17); the inner wall of the sleeve (8) is fixedly connected to a spring (16); the other end of the spring (16) is fixedly connected to a slide bar (15); the inner wall of the slide bar (15) is rotatably connected to the third rotating shaft (18); the outer wall of the third rotating shaft (18) is fixedly connected to a rotating seat (7); the right end of the rotating seat (7) is slidably connected to the left end of the baffle (6).

3. The check valve for preventing backflow pollution according to claim 1, characterized in that: The limit assembly comprises a threaded rod (4) rotatably connected to the inner wall of the upper cavity (3), a hand wheel (5) fixedly connected to the top of the threaded rod (4), a limit rod (13) threadedly connected to the outer wall of the threaded rod (4), and the inner wall of the limit rod (13) slidably connected to the outer wall of the guide rod (14).

4. The check valve for preventing backflow pollution according to claim 1, characterized in that: The bottom end of the second rotating seat (11) is fixedly connected to the inner wall of the valve body (1).

5. The check valve for preventing backflow pollution according to claim 2, characterized in that: The outer wall of the sliding rod (15) is slidably connected to the inner wall of the sleeve (8).

6. The check valve for preventing backflow pollution according to claim 2, characterized in that: The left end of the baffle (6) is arranged at the right end of the left pipe (2).

7. The check valve for preventing backflow pollution according to claim 3, characterized in that: The bottom end of the threaded rod (4) is rotatably connected to the inner wall of the valve body (1), and the bottom end of the guide rod (14) is fixedly connected to the inner wall of the valve body (1).

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