A backflow prevention filter stop valve

Abstract

The utility model discloses a kind of backflow prevention filtering stop valves, belong to valve technical field, including round pipe, connecting pipe, connecting column, rotating column, internal thread, cylinder, screw rod, hand wheel and flow stopping column, connecting pipe sleeve is located in the middle of round pipe, connecting column and rotating column are sequentially fixedly connected in the top of connecting pipe, rotating hand wheel can drive screw rod rotate in the internal thread of rotating column and move along axial direction, to drive cylinder and the flow stopping column of bottom fixedly connected with screw rod realize lifting to open or close the flow passage in round pipe, round pipe inside is also fixedly connected with filter screen for filtering impurities, and by pin shaft rotation connection a baffle under opening in forward water flow, under closing in reverse water flow. The utility model integrates three functions of stop, filtering and backflow prevention in single valve body, solve the problem that multiple independent valves need to be installed in series in the prior art, resulting in complex structure, large space occupation, inconvenience of installation and high risk of leakage.

Description

Technical Field

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

[0002] In fluid pipeline systems, in order to ensure the normal delivery of media and the safe operation of equipment, it is often necessary to achieve multiple control functions simultaneously. For example, shut-off valves are needed to manually open or close the flow channel for maintenance or process control. At the same time, in order to prevent solid particles or impurities in the media from damaging downstream pumps or instruments and other precision equipment, filters need to be installed in the pipeline. Furthermore, under specific operating conditions, such as at the pump outlet or in situations where media contamination is to be prevented, check valves also need to be installed to automatically prevent the fluid from flowing backward.

[0003] In existing technical practices, when a pipeline needs to simultaneously perform the three functions of shut-off, filtration, and backflow prevention, the conventional approach is to install the shut-off valve, filter, and check valve in series within the pipeline.

[0004] While this solution achieves the required functionality, the series installation of three independent valve bodies results in a lengthy overall structure that occupies a significant amount of piping installation space. This is particularly disadvantageous in space-constrained compact equipment or applications. Secondly, purchasing and installing three independent valves significantly increases material costs and installation complexity. Thirdly, the series connection of multiple valves multiplies the number of sealing points in the piping system, with each connection point representing a potential leak point. This greatly increases the risk of fluid leakage and reduces the overall safety and reliability of the system.

[0005] Therefore, this utility model proposes an anti-backflow filter shut-off valve to solve the problems of complex structure, large space occupation, and many leakage points caused by the need to install multiple valves in series in the prior art. Utility Model Content

[0006] In view of the problems that existing pipeline control valves have limited structural functions and require multiple independent valves to be installed in series to achieve simultaneous shut-off, filtration and backflow prevention, resulting in complex overall structure, large space occupation, many leakage points and low reliability, this utility model aims to provide a backflow prevention filter shut-off valve with an improved structure that can effectively solve the above problems.

[0007] This utility model provides an anti-backflow filter shut-off valve, comprising: a round pipe, a connecting pipe, a connecting column, a rotating column, an internal thread, a cylinder, a screw, a handwheel, a flow-stopping column, a filter screen, a baffle, and a pin.

[0008] The connecting tube is sleeved in the middle of the circular tube, the connecting post is fixedly connected to the top of the connecting tube, the rotating post is fixedly connected to the top of the connecting post, the internal thread is fixedly connected to the inside of the rotating post, the cylinder is sleeved inside the rotating post, the screw is fixedly connected to the top of the cylinder, the screw is threaded with the internal thread and rotatably connected to the rotating post, the handwheel is fixedly connected to the top of the screw, and the flow-stopping post is fixedly connected to the bottom of the cylinder. The flow-stopping post is used to move downward under the drive of the handwheel to close or move upward to open the flow channel inside the circular tube.

[0009] Furthermore, the filter screen is fixedly connected inside the circular tube, and the baffle is rotatably connected inside the circular tube via the pin shaft, thus combining the cut-off structure, the filtration structure, and the anti-backflow structure into one unit.

[0010] Preferably, a sealing ring is installed in the middle of the flow-stopping column. When the flow-stopping column moves downward to close the flow channel, the sealing ring fits tightly against the inner wall of the flow channel of the circular tube to achieve a seal.

[0011] Preferably, a sealing column is fixedly connected to the middle of the cylinder, and a second sealing ring is installed in the middle of the sealing column. The second sealing ring is used to ensure the seal between the cylinder and the connecting column.

[0012] In one specific implementation, the sealing ring two is installed on the outer periphery of the sealing column, and the sealing ring two slides and seals against the inner wall of the connecting column.

[0013] Preferably, the filter screen is fixedly connected to the upstream position of the internal flow channel of the circular tube to intercept solid particles and impurities in the water flow.

[0014] Preferably, the baffle is located in the middle of the inner side of the connecting pipe and is located downstream of the fluid in the positive flow direction near the stop column.

[0015] Furthermore, the rear side of the baffle is rotatably connected to the inside of the circular tube via the pin. The baffle opens by rotating around the pin under the action of forward water flow and closes by rotating around the pin under the action of reverse water flow.

[0016] Preferably, the rotating column is fixedly connected to the connecting pipe via the connecting column, and the connecting pipe is annularly sleeved and fixed to the middle of the outer wall of the circular pipe.

[0017] This utility model has the following beneficial effects:

[0018] 1. The utility model solves the problem that the existing technology requires multiple independent valves to be installed in series to achieve the functions of shut-off, filtration and backflow prevention, resulting in complex structure, large space occupation and high cost. It achieves the effects of compact structure, high functional integration, saving installation space and reducing leakage points.

[0019] 2. This utility model achieves manual and precise shut-off by using a handwheel screw to drive the lifting and lowering of the stop column, while using a baffle structure connected by a pin shaft rotating on one side to achieve automatic backflow prevention of fluid. This solves the problem that manual operation and automatic protection functions are difficult to reliably integrate in a single compact valve body, achieving stable operation of shut-off, filtration and backflow prevention without interference between them. Attached Figure Description

[0020] Figure 1 This is a perspective view of an anti-backflow filter shut-off valve proposed in this utility model;

[0021] Figure 2 This is a cross-sectional view of the circular tube in an anti-backflow filter shut-off valve proposed in this utility model.

[0022] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0023] Figure 4 This is a cross-sectional view of the rotating column in an anti-backflow filter shut-off valve proposed in this utility model.

[0024] Legend:

[0025] 1. Round tube; 2. Connecting tube; 3. Connecting column; 4. Rotating column; 5. Handwheel; 6. Internal thread; 7. Screw; 8. Cylindrical column; 9. Sealing column; 10. Flow-stopping column; 11. Sealing ring one; 12. Sealing ring two; 13. Filter screen; 14. Baffle; 15. Pin. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0027] Example:

[0028] Please refer to Figures 1 to 4This utility model provides an anti-backflow filter shut-off valve, which aims to solve the problem that the valves in the prior art have a single function and require multiple valve bodies to be installed in series to achieve the functions of shut-off, filtration and anti-backflow at the same time, resulting in complex structure, large space occupation and high cost.

[0029] Please refer to Figures 1 to 4 A backflow prevention filter shut-off valve includes a circular tube 1, a connecting tube 2, a connecting column 3, and a rotating column 4 forming the basic frame of the valve body. The middle part of the circular tube 1 is sleeved on the connecting tube 2. The connecting column 3 is fixedly connected to the top of the connecting tube 2, and the rotating column 4 is fixedly connected to the top of the connecting column 3. An internal thread 6 is fixedly connected inside the rotating column 4. At the same time, a cylinder 8 is also sleeved inside the rotating column 4. A screw 7 is fixedly connected to the top of the cylinder 8. A handwheel 5 is further fixedly connected to the top of the screw 7. The screw 7 and the internal thread 6 are threaded together, and the screw 7 and the rotating column... 4. Rotary connection: A sealing column 9 is fixedly connected to the middle of the cylinder 8. A second sealing ring 12 is installed in the middle of the sealing column 9. A flow-stopping column 10 is fixedly connected to the bottom of the cylinder 8. A first sealing ring 11 is installed in the middle of the flow-stopping column 10. The handwheel 5, screw 7, cylinder 8, sealing column 9, flow-stopping column 10, internal thread 6, first sealing ring 11 and second sealing ring 12 together constitute a stop assembly for opening or closing the flow channel. A filter screen 13 is fixedly connected inside the circular tube 1, and a baffle 14 is rotatably connected inside the circular tube 1 through a pin 15.

[0030] Please refer to Figure 2 , Figure 3 and Figure 4 When the handwheel 5 is turned, the handwheel 5 drives the screw 7 fixedly connected to the top to rotate synchronously. Since the screw 7 forms a threaded engagement with the internal thread 6 fixed inside the rotating column 4, and the screw 7 itself can rotate relative to the rotating column 4, the screw 7 will move upward or downward in a straight line along the axial direction of the internal thread 6 while rotating. Since the top of the screw 7 is fixedly connected to the cylinder 8, the displacement of the screw 7 will drive the cylinder 8 and the stop column 10 fixed at the bottom of the cylinder 8 to move up and down synchronously. When the stop column 10 moves upward and completely disengages from the flow channel of the circular pipe 1, the valve opens. When the stop column 10 moves downward and enters the flow channel of the circular pipe 1, the valve closes. The sealing ring 11 installed in the middle of the stop column 10 will fit tightly against the inner wall of the flow channel of the circular pipe 1, thereby achieving a tight cut-off of the water flow. This method of controlling the rise and fall of the valve core through threaded transmission ensures the stability of operation and the reliability of sealing.

[0031] To prevent fluid leakage from the operating mechanism, a sealing column 9 is also fixedly connected to the middle of the cylinder 8. Please refer to [reference needed]. Figure 3A second sealing ring 12 is installed on the outer periphery of the sealing column 9. In the assembled state, the sealing column 9 together with the second sealing ring 12 is located in the internal cavity of the connecting column 3. The second sealing ring 12 forms a sliding and sealing fit with the inner wall of the connecting column 3. When the cylinder 8 moves up and down, the second sealing ring 12 can effectively seal the gap between the cylinder 8 and the connecting column 3, prevent the internal fluid from leaking outward, and ensure the overall sealing performance of the entire valve.

[0032] In a preferred embodiment, in order to filter the fluid, a filter screen 13 is fixedly connected inside the circular tube 1. Specifically, the filter screen 13 is fixedly connected at the upstream position of the flow channel inside the circular tube 1. When the fluid flows through the circular tube 1, it will first pass through the filter screen 13. The filter screen 13 can effectively intercept solid particles and impurities in the water flow, thereby purifying the fluid.

[0033] As another preferred embodiment, in order to achieve the function of preventing backflow of fluid, a baffle 14 and a pin 15 are provided inside the circular pipe 1. The baffle 14 is located in the middle of the inner side of the connecting pipe 2 and is located on the downstream side of the fluid in the positive flow direction near the stop column 10. The rear side of the baffle 14 is rotatably connected to the inside of the circular pipe 1 through the pin 15. This unilateral pivoting connection means that the baffle 14 can only be opened in one direction.

[0034] In a more specific implementation, the rotating column 4 is fixedly connected to the connecting pipe 2 via the connecting column 3. The connecting pipe 2 is annularly sleeved and fixed to the middle of the outer wall of the circular pipe 1. This structure ensures the stability and coaxiality of the connection between the upper operating mechanism and the lower pipeline.

[0035] As a further optimization of the sealing structure, a second sealing ring 12 is installed on the outer periphery of the sealing column 9. The second sealing ring 12 forms a sliding and sealing fit with the inner wall of the connecting column 3, ensuring that the effectiveness of the dynamic seal is always maintained during the reciprocating motion of the sealing column 9 driven by the cylinder 8, and preventing any media leakage.

[0036] Working principle:

[0037] When it is necessary to open or close the valve, the handwheel 5 is turned, which drives the screw 7 to rotate inside the rotating column 4. Since the screw 7 is threadedly engaged with the internal thread 6, the screw 7 will drive the fixedly connected cylinder 8 and the flow stop column 10 at the bottom of the cylinder 8 to move upward or downward along the axis while rotating. When the flow stop column 10 moves upward and disengages from the flow channel of the circular pipe 1, the valve opens. When the flow stop column 10 moves downward to close the flow channel, the sealing ring 11 installed on the flow stop column 10 fits tightly against the inner wall of the circular pipe 1, so as to reliably cut off the water flow.

[0038] When the valve is open, the fluid flowing in the circular pipe 1 first passes through the fixed filter screen 13. The filter screen 13 intercepts solid particles and impurities in the fluid, thereby achieving the filtration function. As the fluid continues to flow, it pushes the baffle 14, which is unidirectionally connected by the pin 15, to open the baffle 14. If the water flows in reverse, the pressure of the reverse water flow will act on the front of the baffle 14, causing the baffle 14 to rotate around the pin 15 to close the flow channel, thereby effectively preventing water backflow and achieving the anti-backflow function.

Claims

1. A backflow prevention filter shut-off valve, comprising: A circular tube (1) is fitted into a connecting tube (2) at its middle part, and a connecting column (3) is fixedly connected to the top of the connecting tube (2). The feature is that the top of the connecting column (3) is fixedly connected to the rotating column (4), the inside of the rotating column (4) is fixedly connected to the internal thread (6), the inside of the rotating column (4) is also fitted with a cylinder (8), the top of the cylinder (8) is fixedly connected to the screw (7), the screw (7) is threadedly engaged with the internal thread (6) and rotatably connected to the rotating column (4), the top of the screw (7) is fixedly connected to the handwheel (5), the bottom of the cylinder (8) is fixedly connected to the flow stop column (10), the flow stop column (10) is used to move downward under the drive of the handwheel (5) to close or move upward to open the flow channel inside the round tube (1), the inside of the round tube (1) is fixedly connected to the filter screen (13), the inside of the round tube (1) is provided with a baffle (14), the baffle (14) is rotatably connected inside the round tube (1) through a pin (15).

2. The anti-backflow filter shut-off valve according to claim 1, characterized in that, A sealing ring (11) is installed in the middle of the flow-stopping column (10). When the flow-stopping column (10) moves downward to close the flow channel, the sealing ring (11) fits tightly against the inner wall of the flow channel of the circular tube (1) to achieve a seal.

3. The anti-backflow filter shut-off valve according to claim 2, characterized in that, The cylinder (8) is fixedly connected to the sealing column (9) in the middle, and the sealing ring (12) is installed in the middle of the sealing column (9). The sealing ring (12) is used to ensure the seal between the cylinder (8) and the connecting column (3).

4. The anti-backflow filter shut-off valve according to claim 1, characterized in that, The filter screen (13) is fixedly connected to the upstream position of the internal flow channel of the circular tube (1) to intercept solid particles and impurities in the water flow.

5. The anti-backflow filter shut-off valve according to claim 1, characterized in that, The baffle (14) is located in the middle of the inner side of the connecting pipe (2) and is located on the downstream side of the fluid in the positive flow direction near the stop column (10).

6. The anti-backflow filter shut-off valve according to claim 5, characterized in that, The rear side of the baffle (14) is rotatably connected to the inside of the circular tube (1) via the pin (15). The baffle (14) rotates around the pin (15) to open under the action of forward water flow and rotates around the pin (15) to close under the action of reverse water flow.

7. The anti-backflow filter shut-off valve according to claim 1, characterized in that, The rotating column (4) is fixedly connected to the connecting pipe (2) through the connecting column (3), and the connecting pipe (2) is annularly sleeved and fixed to the middle of the outer wall of the round pipe (1).

8. The anti-backflow filter shut-off valve according to claim 3, characterized in that, The sealing ring 2 (12) is installed on the outer periphery of the sealing column (9), and the sealing ring 2 (12) slides and seals against the inner wall of the connecting column (3).

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