Backflow preventer of pipe network pressure-superposed water supply equipment

Abstract

The utility model relates to the technical field of water supply equipment, and discloses a backflow preventer of pipe network pressure-superposed water supply equipment, which comprises a valve body, the left end of the valve body is a water inlet end, the right end of the valve body is a water outlet end, a water inlet check valve is arranged in the water inlet end, and a water outlet check valve is arranged in the water outlet end. A first spring can rapidly drive a plugging block to move, a first piston and a second piston are tightly attached to the inner wall of a sealing pipe and the inner wall of an oil bin tank, so that the first piston and the second piston are low in reaction speed, and within a period of time when backflow water is drained, hydraulic oil continuously pushes a first piston to move rightwards, and then a push rod is driven to move rightwards; the push rod pushes the first guide rod to move rightwards, and then the plugging block is driven to move rightwards, so that the plugging block gradually plugs the communication position of the water drainage pipe and the communication pipe till the plugging block is tightly attached to the first sealing ring, the water drainage process is completely interrupted, and a large amount of backflow water is prevented from being drained.

Description

Technical Field

[0001] This utility model relates to the field of water supply equipment technology, specifically to a backflow preventer for a pipeline superimposed pressure water supply system. Background Technology

[0002] Pipeline booster pumps are water supply systems that pressurize the existing water pressure in a pipeline network. Existing pipeline booster pumps often include a backflow preventer at the input end to prevent backflow. The backflow preventer was developed to address the serious backflow contamination issues in tap water supply systems, especially drinking water pipelines, where effective backflow prevention devices are lacking. It is a hydraulic control device that strictly limits the flow of water in the pipeline to one direction only. Its function is to prevent backflow of the medium in the pipeline under any operating condition, thereby avoiding backflow contamination. Currently, backflow preventers are mainly divided into two categories: low-resistance backflow preventers and pressure-reducing backflow preventers.

[0003] The existing low-resistance backflow preventer consists of two independent spring-assisted elastic seal check valves and an independent hydraulic differential drain valve in the intermediate pressure reducing chamber. When the water pressure at the inlet is lower than that at the outlet, both the spring-assisted elastic seal check valves at the inlet and outlet close, and the hydraulic differential drain valve discharges the water flowing back into the valve chamber. However, when the spring-assisted elastic seal check valve at the outlet is blocked by backflow debris, the water flowing back from the outlet will continue to enter the valve chamber and then be discharged by the hydraulic differential drain valve, resulting in a large amount of backflow water being discharged, thus wasting resources. Utility Model Content

[0004] The purpose of this utility model is to provide a backflow preventer for a pipeline superimposed pressure water supply system to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a backflow preventer for a pipeline superimposed water supply equipment, comprising a valve body, the left end of the valve body being the inlet end and the right end of the valve body being the outlet end, an inlet check valve being provided inside the inlet end and an outlet check valve being provided inside the outlet end, and a drain valve structure being connected to the lower part of the valve body;

[0006] The drain valve structure includes an inlet pipe, a drain pipe, a drain outlet pipe, a connecting pipe, and a movable cavity pipe. The top end of the inlet pipe is connected to the interior of the inlet end, the bottom end of the inlet pipe is connected to the movable cavity pipe, the left end of the connecting pipe is connected to the movable cavity pipe, the top end of the drain pipe is connected to the valve cavity of the valve body, the bottom end of the drain pipe is connected to the connecting pipe, the left end of the drain pipe is connected to the connecting pipe, a sealing ring is fixedly installed inside the connecting pipe, a blocking block is slidably installed inside the connecting pipe, the sealing ring is located between the drain pipe and the drain outlet pipe, a guide rod is fixedly installed on the left end of the blocking block, a spring is fixedly installed on the left end of the blocking block, the left end of the spring is fixedly connected to the inner wall of the movable cavity pipe, and a drain interruption mechanism is connected to the left end of the movable cavity pipe.

[0007] The water discharge interruption mechanism includes an oil tank, with a hydraulic oil pipe connected to the bottom of the oil tank. A sealing pipe is connected to the right end of the hydraulic oil pipe. The outer wall of the sealing pipe is fixedly connected to the inner wall of the movable cavity pipe, and the right end of the sealing pipe is located inside the movable cavity pipe. Hydraulic oil is provided inside the hydraulic oil pipe. A piston is slidably arranged inside the sealing pipe. A push rod is fixedly installed on the right outer wall of the piston. A second piston is slidably arranged on the inner wall of the oil tank. A counterweight is placed on the top of the second piston.

[0008] Furthermore, the inlet check valve and the outlet check valve have the same structure, and both the inlet check valve and the outlet check valve are configured with left inlet and right outlet.

[0009] Furthermore, the top of the oil tank is provided with a ventilation port, and the piston two is thickened.

[0010] Furthermore, the length of the push rod is greater than the distance between the sealing ring and the sealing block.

[0011] Furthermore, a flow meter is installed at the connection point between the drain pipe and the connecting pipe.

[0012] Furthermore, the inlet check valve includes a fixing frame, which is fixedly installed on the inner wall of the inlet end. A second sealing ring is fixedly installed on the right side of the fixing frame. A second guide rod is slidably arranged on the inner wall of the fixing frame. A valve plate is fixedly installed on the right end of the second guide rod, and the valve plate presses on the second sealing ring. An installation plate is fixedly installed on the left end of the second guide rod. A second spring is fixedly installed on the outer right side of the installation plate, and the right end of the second spring is fixedly connected to the outer wall of the fixing frame.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] 1. Spring 1 can quickly move the sealing block, while pistons 1 and 2 react more slowly because they are tightly fitted to the sealing pipe and the inner wall of the oil tank. During the period of draining the backflow water, the hydraulic oil continuously pushes piston 1 to the right, which in turn drives the push rod to the right. The push rod pushes guide rod 1 to the right, which in turn drives the sealing block to the right. This causes the sealing block to gradually seal the connection between the drain pipe and the connecting pipe until the sealing block is tightly fitted to the sealing ring 1, thus completely stopping the draining process and preventing a large amount of backflow water from being discharged. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model;

[0016] Figure 2 This utility model Figure 1 A structural diagram of the left side view;

[0017] Figure 3 This utility model Figure 1 A structural schematic diagram of the front sectional view;

[0018] Figure 4 This is a structural schematic diagram of the front sectional view of the oil tank of this utility model;

[0019] Figure 5 This is a schematic diagram of the structure of the inlet check valve of this utility model.

[0020] In the diagram: 1. Valve body; 2. Inlet; 3. Outlet; 4. Drain valve structure; 401. Inlet pipe; 402. Drain pipe; 403. Drain pipe; 404. Blocking block; 405. Guide rod one; 406. Spring one; 407. Sealing ring one; 408. Connecting pipe; 409. Movable cavity pipe; 5. Inlet check valve; 501. Fixing frame; 502. Sealing ring two; 503. Valve plate; 504. Guide rod two; 505. Mounting plate; 506. Spring two; 6. Outlet check valve; 7. Drain interruption mechanism; 701. Oil tank; 702. Hydraulic oil pipe; 703. Push rod; 704. Piston one; 705. Sealing pipe; 706. Piston two; 707. Counterweight; 8. Air vent; 9. Flow meter. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0022] Please see Figures 1-5This utility model provides a technical solution: a backflow preventer for a pipeline superimposed water supply equipment, including a valve body 1, the left end of the valve body 1 is the water inlet 2, the right end of the valve body 1 is the water outlet 3, a water inlet check valve 5 is provided in the water inlet 2, a water outlet check valve 6 is provided in the water outlet 3, and a drain valve structure 4 is connected to the bottom of the valve body 1.

[0023] The drain valve structure 4 includes an inlet pipe 401, a drain pipe 402, a drain pipe 403, a connecting pipe 408, and a movable cavity pipe 409. The top end of the inlet pipe 401 is connected to the interior of the inlet end 2, and the bottom end of the inlet pipe 401 is connected to the movable cavity pipe 409. The left end of the connecting pipe 408 is connected to the movable cavity pipe 409. The top end of the drain pipe 402 is connected to the valve cavity of the valve body 1, and the bottom end of the drain pipe 402 is connected to the connecting pipe 408. The drain pipe... The left end of 403 is connected to the connecting pipe 408. A sealing ring 407 is fixedly installed inside the connecting pipe 408. A blocking block 404 is slidably installed inside the connecting pipe 408. The sealing ring 407 is located between the drain pipe 402 and the drain pipe 403. A guide rod 405 is fixedly installed on the left end of the blocking block 404. A spring 406 is fixedly installed on the left end of the blocking block 404. The left end of the spring 406 is fixedly connected to the inner wall of the movable cavity pipe 409. Next, a drain interruption mechanism 7 is connected to the left end of the movable cavity tube 409. After water enters the inlet end 2 and the water pressure is sufficient, the water flows from the inlet pipe 401 into the movable cavity tube 409, and then pushes the sealing block 404 to move to the right until the right end of the sealing block 404 presses on the sealing ring 407, sealing the connection between the connecting pipe 408 and the drain pipe 402, ensuring that the water can enter the valve cavity of the valve body 1 after passing through the inlet check valve 5. Then, after passing through the outlet check valve 6, the water flows out from the outlet end 3. At this time, the spring 406 is stretched. When the water pressure in the inlet end 2 drops to the point where it cannot overcome the elastic force of the spring 406, the spring 406 restores its deformation and drives the sealing block 404 to move to the left, causing the drain pipe 402 to leak out at the connection between the connecting pipe 408 and the drain pipe 402. This allows the water in the valve cavity of the valve body 1 to enter the connecting pipe 408 and then be discharged from the drain pipe 403, thus achieving the purpose of draining water.

[0024] The water discharge interruption mechanism 7 includes an oil tank 701. A hydraulic oil pipe 702 is connected to the bottom of the oil tank 701. A sealing pipe 705 is connected to the right end of the hydraulic oil pipe 702. The outer wall of the sealing pipe 705 is fixedly connected to the inner wall of the movable cavity pipe 409, and the right end of the sealing pipe 705 is located inside the movable cavity pipe 409. Hydraulic oil is contained in the hydraulic oil pipe 702. A piston 704 is slidably mounted inside the sealing pipe 705. The right outer wall of the piston 704... A push rod 703 is fixedly installed, and a piston 706 is slidably mounted on the inner wall of the oil tank 701. A counterweight 707 is placed on top of the piston 706. Because the sealing pipe 705 is connected to the movable cavity pipe 409, when the water pressure in the movable cavity pipe 409 is sufficient, it can not only push the sealing block 404 to move to the right, but also push the piston 704 to move to the left, squeezing the hydraulic oil out of the sealing pipe 705. The water pressure in the movable cavity pipe 409 is reduced to a level that is insufficient to overcome the hydraulic pressure. When the spring 406 is subjected to its elastic force, it can quickly move the sealing block 404. However, because pistons 704 and 706 are in close contact with the inner wall of the sealing pipe 705 and the oil tank 701, their response speed is slower. This results in the hydraulic oil continuously pushing piston 704 to the right during the period of draining the return water, which in turn drives push rod 703 to the right. Push rod 703 then pushes guide rod 405. Move to the right, which in turn moves the sealing block 404 to the right, thereby gradually sealing the connection between the drain pipe 402 and the connecting pipe 408 until the sealing block 404 and the sealing ring 407 are tightly fitted together, thus interrupting the entire draining process and preventing a large amount of backflow water from being discharged. A counterweight 707 is set to push the piston 706 down, thereby squeezing the hydraulic oil in the oil tank 701 into the hydraulic oil pipe 702, and then into the sealing pipe 705.

[0025] The inlet check valve 5 and the outlet check valve 6 have the same structure, and both the inlet check valve 5 and the outlet check valve 6 are set to enter from the left and exit from the right to ensure that the backflow water will not flow back into the inlet end 2 and thus pollute the pre-filter water source.

[0026] The top of the oil tank 701 is provided with a vent 8. The piston 706 is thickened. The vent 8 is provided to ensure that the air pressure inside the oil tank 701 is balanced when the piston 706 moves up and down. Thickening the piston 706 can further reduce the rate at which the piston 706 moves down, and prevent the piston 704 from being pushed to the right quickly due to the excessive rate at which the piston 706 moves down.

[0027] The length of push rod 703 is greater than the distance between sealing ring 407 and sealing block 404, ensuring that piston 704 will not detach from sealing tube 705 during the process of push rod 703 pushing guide rod 405;

[0028] A flow meter 9 is installed at the connection between the drain pipe 403 and the connecting pipe 408 to monitor the amount of discharged return water;

[0029] The inlet check valve 5 includes a mounting bracket 501, which is fixedly installed on the inner wall of the inlet end 2. A second sealing ring 502 is fixedly installed on the right side of the mounting bracket 501. A second guide rod 504 is slidably arranged on the inner wall of the mounting bracket 501. A valve plate 503 is fixedly installed on the right end of the second guide rod 504, and the valve plate 503 presses against the second sealing ring 502. A mounting plate 505 is fixedly installed on the left end of the second guide rod 504. The right outer wall of the mounting plate 505 is fixedly... A second spring 506 is fixedly installed, with its right end fixedly connected to the outer wall of the fixed frame 501. When the water flows from left to right, it can push the valve plate 503 to move to the right, causing the valve plate 503 to separate from the sealing ring 502, ensuring that the water can flow through the inlet check valve 5. When the water pressure is insufficient, the second spring 506 pushes the mounting plate 505 to the left, which in turn drives the guide rod 504 to move to the left, causing the valve plate 503 to reset, thus realizing the check function.

[0030] Working principle: During use, water is introduced from the inlet end 2. When the water pressure is high enough, it can push the valve plate 503 to separate from the sealing ring 502, and push the blocking block 404 to the right to fit with the sealing ring 407. At this time, normal water flow can be allowed. When the water pressure drops to the point where it cannot overcome the elastic force of the spring 406 and the second spring 506, the second spring 506 pushes the mounting plate 505 to the left, which in turn drives the guide rod 504 to the left, causing the valve plate 503 to reset, thus achieving the check function. The first spring 406 quickly drives the blocking block 404 to move, causing the blocking block 404 to separate from the sealing ring 407, draining the water in the valve chamber of the valve body 1. Because piston 704 and piston 706 are tightly fitted to the inner wall of sealing pipe 705 and oil tank 701, their reaction speed is relatively slow. This results in the hydraulic oil continuously pushing piston 704 to the right during the drainage of backflow water, which in turn drives push rod 703 to the right. Push rod 703 pushes guide rod 405 to the right, which in turn drives sealing block 404 to the right. As a result, sealing block 404 gradually seals the connection between drain pipe 402 and connecting pipe 408 until sealing block 404 is tightly fitted with sealing ring 407, thus completely interrupting the drainage process and preventing a large amount of backflow water from being discharged.

[0031] Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

Claims

1. A backflow preventer for a pipeline booster water supply system, comprising a valve body (1), wherein the left end of the valve body (1) is an inlet (2) and the right end of the valve body (1) is an outlet (3), characterized in that: An inlet check valve (5) is provided in the inlet end (2), an outlet check valve (6) is provided in the outlet end (3), and a drain valve structure (4) is connected to the bottom of the valve body (1). The drain valve structure (4) includes an inlet pipe (401), a drain pipe (402), a drain pipe (403), a connecting pipe (408), and a movable cavity pipe (409). The top end of the inlet pipe (401) is connected to the interior of the inlet end (2), and the bottom end of the inlet pipe (401) is connected to the movable cavity pipe (409). The left end of the connecting pipe (408) is connected to the movable cavity pipe (409). The top end of the drain pipe (402) is connected to the valve cavity of the valve body (1), and the bottom end of the drain pipe (402) is connected to the connecting pipe (408). The left end of the drain pipe (403) is connected to the connecting pipe (409). 408) Connecting, a sealing ring (407) is fixedly installed inside the connecting pipe (408), a blocking block (404) is slidably arranged inside the connecting pipe (408), the sealing ring (407) is located between the drain pipe (402) and the drain pipe (403), a guide rod (405) is fixedly installed at the left end of the blocking block (404), a spring (406) is fixedly installed at the left end of the blocking block (404), the left end of the spring (406) is fixedly connected to the inner wall of the movable cavity pipe (409), and a drain interruption mechanism (7) is connected to the left end of the movable cavity pipe (409); The water discharge interruption mechanism (7) includes an oil tank (701), a hydraulic oil pipe (702) is connected to the bottom of the oil tank (701), a sealing pipe (705) is connected to the right end of the hydraulic oil pipe (702), the outer wall of the sealing pipe (705) is fixedly connected to the inner wall of the movable cavity pipe (409), and the right end of the sealing pipe (705) is located inside the movable cavity pipe (409). The hydraulic oil pipe (702) is filled with hydraulic oil. A piston (704) is slidably arranged inside the sealing pipe (705). A push rod (703) is fixedly installed on the right outer wall of the piston (704). A piston (706) is slidably arranged on the inner wall of the oil tank (701), and a counterweight (707) is placed on the top of the piston (706).

2. The backflow preventer for a pipeline superimposed pressure water supply system according to claim 1, characterized in that: The inlet check valve (5) and outlet check valve (6) have the same structure, and both the inlet check valve (5) and outlet check valve (6) are configured to be left inlet and right outlet.

3. The backflow preventer for a pipeline superimposed pressure water supply system according to claim 1, characterized in that: The top of the oil tank (701) is provided with a ventilation port (8), and the piston (706) is thickened.

4. The backflow preventer for a pipeline superimposed pressure water supply system according to claim 1, characterized in that: The length of the push rod (703) is greater than the distance between the sealing ring (407) and the sealing block (404).

5. The backflow preventer for a pipeline superimposed pressure water supply system according to claim 1, characterized in that: A flow meter (9) is installed at the connection between the drain pipe (403) and the connecting pipe (408).

6. The backflow preventer for a pipeline superimposed pressure water supply system according to claim 1, characterized in that: The inlet check valve (5) includes a fixing frame (501), which is fixedly installed on the inner wall of the inlet end (2). A sealing ring (502) is fixedly installed on the right side of the fixing frame (501). A guide rod (504) is slidably arranged on the inner wall of the fixing frame (501). A valve plate (503) is fixedly installed on the right end of the guide rod (504). The valve plate (503) presses on the sealing ring (502). An installation plate (505) is fixedly installed on the left end of the guide rod (504). A spring (506) is fixedly installed on the outer right side of the installation plate (505). The right end of the spring (506) is fixedly connected to the outer wall of the fixing frame (501).

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