A flow control valve with anti-backflow structure

Abstract

This utility model relates to the technical field of flow control valves, and in particular to a flow control valve with an anti-backflow structure. It includes a valve body one, with a valve body two installed at one external end. When the ball moves under fluid pressure, it drives the guide tube to move as well. During the movement of the guide tube, it compresses the telescopic rod and the compression spring. When the fluid pressure decreases or backflow occurs, the spring force of the compression spring pushes the guide tube and the ball back to their original positions, thus controlling the opening and closing of the through-hole by the ball. The annular frame and sealing ring enhance the sealing between the through-hole and the ball. The ball and sealing ring are in close contact, allowing the ball to better block the through-hole during anti-backflow. When the filter or sealing ring needs to be replaced, simply unscrew the bolts to remove the limiting block from the limiting groove, and then use the connecting rod to remove the circular plate from the annular seat, facilitating the replacement of the filter and sealing ring. After replacement, the circular plate is reinstalled in its original position and the bolts are tightened, improving practicality.

Description

Technical Field

[0001] This utility model relates to the technical field of flow control valves, and in particular to a flow control valve with an anti-backflow structure. Background Technology

[0002] A flow control valve is a key control element used in hydraulic or pneumatic systems to precisely regulate and control the flow rate of fluid. It adjusts the flow rate through the valve port by changing the cross-sectional area of ​​the throttling orifice or changing the flow length of the fluid in the channel, thereby controlling the speed of the actuator.

[0003] A flow control valve with an anti-backflow structure is disclosed on the Chinese patent website, publication number CN222085185U. It includes a valve body and a filter screen. The valve body has an inlet and an outlet on both sides, with a water flow perforation between them. A filter groove is located below the water flow perforation, and a guide groove is located above the valve body. A guide post is installed in the guide groove, and a connecting block is fixed to the end of the guide post. A plug is installed on the outside of the connecting block. The filter screen is placed in the filter groove, and a connecting rod is fixed above the filter screen. A valve cover is located above the guide groove, with a movable groove on its inner side. A positioning groove is located on the inner side of the guide post, and a positioning block is slidably connected in the positioning groove. A positioning rod is fixed on the positioning block, and a spring is sleeved on the outside of the positioning rod. In use, water flows in from the inlet and out from the outlet. Before passing through the water flow perforation, it first passes through the filter screen in the filter groove, which filters out impurities in the water, preventing impurities from adhering to the water flow perforation or the plug and affecting the subsequent anti-backflow sealing.

[0004] The following problems exist with this solution: Before the water flows through the perforation, it first passes through the filter screen of the filter tank to remove impurities from the water, preventing impurities from adhering to the perforation or the plug and affecting the sealing performance of the backflow prevention system. However, after long-term use, if the filter screen or the sealing gasket in contact with the plug is damaged, it is inconvenient to repair or replace it. The parts cannot be replaced quickly, resulting in low practicality and certain drawbacks.

[0005] Therefore, in order to solve the above problems, this utility model provides a flow control valve with an anti-backflow structure. Utility Model Content

[0006] The purpose of this invention is to provide a flow control valve with an anti-backflow structure to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a flow control valve with an anti-backflow structure, comprising a valve body one, a valve body two installed at one external end of the valve body one, an annular seat installed at one internal end of the valve body one, a through hole opened on the outside of the annular seat, a circular plate installed on the inner side of one end of the annular seat, a filter screen embedded at the outer center of the circular plate, a fixed seat installed at the internal end of the valve body one away from the annular seat, a support frame installed between the inner sidewalls of the fixed seat, a fixed tube installed on the outside of the support frame, a telescopic rod installed at one internal end of the fixed tube, a compression spring installed on the outer ring surface of the telescopic rod, a guide tube installed at one end of the telescopic rod and inside the fixed tube, and a ball installed at the end of the guide tube away from the telescopic rod and close to the through hole.

[0008] Preferably, the outer ring size of the circular plate is adapted to the inner size of one end of the annular seat, and the filter screen fits into the through hole when the circular plate is located inside one end of the annular seat.

[0009] Preferably, connecting rods are installed at both ends of the circular plate, and limit grooves are opened on both sides of one end of the valve body. A limit block is installed at the end of the connecting rod away from the circular plate and inside the limit groove.

[0010] Preferably, a bolt is embedded in the outside of the limiting block, and one end of the bolt passes through the limiting block and enters the interior of the valve body.

[0011] Preferably, an annular frame is installed on the outside of the circular plate, located outside the filter screen. A sealing ring is installed at one end of the annular frame. When the circular plate is located inside one end of the annular seat, the annular frame and the sealing ring are located inside the through hole and are in contact with its inner wall. The side of the sphere away from the guide tube is in contact with the sealing ring.

[0012] Preferably, the outer ring surface of the guide tube is slidably connected to the inner sidewall of the fixed tube, and the movement of the ball will drive the guide tube to move and squeeze the telescopic rod and compress the spring.

[0013] In summary, this utility model has the following beneficial technical effects: This flow control valve features an anti-backflow structure. When the ball moves under fluid pressure, it moves the guide tube along with it. During the movement of the guide tube, it compresses the telescopic rod and the compression spring. When the fluid pressure decreases or backflow occurs, the spring force of the compression spring pushes the guide tube and the ball back to their original positions, thus controlling the opening and closing of the through-hole with the ball. This ensures normal flow control and anti-backflow function of the valve. The side of the ball away from the guide tube is in contact with the sealing ring. The ring frame and sealing ring enhance the sealing between the through-hole and the ball. When the ball and the sealing ring are in contact, the ball can better block the through-hole during anti-backflow, improving the anti-backflow effect. When it is necessary to replace the filter screen or the sealing ring, simply unscrew the bolts to remove the limit block from the limit groove, and then remove the circular plate from the ring seat through the connecting rod. This facilitates the replacement of the filter screen and the sealing ring. After replacement, the circular plate is reinstalled in its original position and the bolts are tightened, making it more practical. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a utility model Figure 1 Partial internal structural diagram; Figure 3 This is a utility model Figure 2 Partial structural layering diagram; Figure 4 This is a utility model Figure 3 Partial structural layering diagram; Figure 5 This is a utility model Figure 4 Schematic diagram on the right side of the structure.

[0015] Explanation of reference numerals in the attached drawings: 1. Valve body one; 101. Limiting groove; 2. Valve body two; 3. Annular seat; 301. Through hole; 4. Circular plate; 5. Filter screen; 6. Fixed seat; 7. Support frame; 8. Fixed pipe; 9. Telescopic rod; 10. Compression spring; 11. Guide tube; 12. Ball; 13. Connecting rod; 14. Limiting block; 15. Bolt; 16. Annular frame; 17. Sealing ring. Detailed Implementation

[0016] The following is in conjunction with the appendix Figure 1 - Figure 5 The present invention will be described in further detail below.

[0017] A flow control valve with an anti-backflow structure, as shown in the reference. Figure 1 - Figure 5The system includes a valve body 1, a valve body 2 mounted on one external end of the valve body 1, an annular seat 3 mounted on one internal end of the valve body 1, a through hole 301 on the external side of the annular seat 3, a circular plate 4 mounted on the inner side of one end of the annular seat 3, a filter screen 5 embedded in the center of the outer side of the circular plate 4, a fixed seat 6 mounted on the internal end of the valve body 1 away from the annular seat 3, a support frame 7 mounted between the inner side walls of the fixed seat 6, a fixed tube 8 mounted on the external side of the support frame 7, a telescopic rod 9 mounted on one internal end of the fixed tube 8, a compression spring 10 mounted on the outer ring surface of the telescopic rod 9, and one end of the telescopic rod 9 located inside the fixed tube 8. A guide tube 11 is installed, and a ball 12 is installed at the end of the guide tube 11 away from the telescopic rod 9 and close to the through hole 301. When fluid flows from valve body 1 into valve body 2, the fluid is first filtered by the filter screen 5 to remove impurities, and then the ball 12 is pushed. The ball 12 drives the guide tube 11 to move. The guide tube 11 squeezes the telescopic rod 9 and the compression spring 10 to make the ball 12 leave the through hole 301, and the fluid can continue to flow through the through hole 301. When backflow occurs, the pressure of the backflowing fluid will push the ball 12 to reset and move towards the through hole 301 until the ball 12 blocks the through hole 301, preventing the fluid from continuing to flow back, thus realizing the anti-backflow function.

[0018] Reference Figure 1 - Figure 5 The outer ring size of the circular plate 4 is adapted to the inner size of one end of the annular seat 3. When the circular plate 4 is located inside one end of the annular seat 3, the filter screen 5 fits into the through hole 301, so that the circular plate 4 can be accurately installed inside one end of the annular seat 3. When the circular plate 4 is installed in place, the filter screen 5 fits into the through hole 301, ensuring that the fluid flowing through the through hole 301 can be filtered by the filter screen 5, effectively intercepting impurities in the fluid and preventing impurities from entering subsequent pipes and equipment and affecting their normal operation.

[0019] Reference Figure 1 - Figure 4Connecting rods 13 are installed at both ends of the circular plate 4. Limiting grooves 101 are opened on both sides of one end of the valve body 1. A limiting block 14 is installed at the end of the connecting rod 13 away from the circular plate 4 and inside the limiting groove 101. The connecting rod 13 connects the circular plate 4 to the limiting block 14. The limiting block 14 is located in the limiting groove 101 and limits the circular plate 4 to prevent the circular plate 4 from shifting position during fluid impact or installation. This ensures that the circular plate 4 can be stably installed on the inner side of one end of the annular seat 3, and ensures that the filter screen 5 and the through hole 301 are properly fitted. For filtration efficiency, the limiting block 14 is externally embedded with a bolt 15, one end of which passes through the limiting block 14 and connects to the inside of the valve body 1. The bolt 15 fixes the limiting block 14 to the valve body 1. When the filter screen 5 or the sealing ring 17 needs to be replaced, simply unscrew the bolt 15 to remove the limiting block 14 from the limiting groove 101. Then, the circular plate 4 can be removed from the annular seat 3 via the connecting rod 13, making it convenient to replace the filter screen 5 and the sealing ring 17. After replacement, the circular plate 4 can be reinstalled in its original position and the bolt 15 can be tightened.

[0020] Reference Figure 1 - Figure 5 An annular frame 16 is installed on the outside of the circular plate 4, located outside the filter screen 5. A sealing ring 17 is installed at one end of the annular frame 16. When the circular plate 4 is located inside one end of the annular seat 3, the annular frame 16 and the sealing ring 17 are located inside the through hole 301 and are in contact with its inner wall. The side of the ball 12 away from the guide tube 11 is in contact with the sealing ring 17. The arrangement of the annular frame 16 and the sealing ring 17 enhances the sealing between the through hole 301 and the ball 12. When the ball 12 is in contact with the sealing ring 17, it can better block the through hole 301 during backflow prevention, thus improving the backflow prevention effect. The outer ring surface of the guide tube 11 is in contact with the inner side of the fixed tube 8. The walls are slidably connected, and when the ball 12 moves, it will drive the guide tube 11 to move and squeeze the telescopic rod 9 and the compression spring 10. The sliding connection between the guide tube 11 and the inner wall of the fixed tube 8 allows the guide tube 11 to move smoothly in the fixed tube 8. When the ball 12 is moved by fluid pressure, it will drive the guide tube 11 to move together. During the movement of the guide tube 11, it squeezes the telescopic rod 9 and the compression spring 10. When the fluid pressure decreases or backflow occurs, the elastic force of the compression spring 10 will push the guide tube 11 and the ball 12 to reset, so as to realize the opening and closing control of the ball 12 on the through hole 301, and ensure the normal flow control and backflow prevention function of the valve.

[0021] The implementation principle of a flow control valve with an anti-backflow structure according to this utility model embodiment is as follows: When the flow control valve is used, when the fluid flows from valve body 1 into valve body 2, the fluid first passes through the filter screen 5 to remove impurities and then pushes the ball 12. The ball 12 drives the guide tube 11 to move. The sliding connection between the guide tube 11 and the inner wall of the fixed tube 8 allows the guide tube 11 to move smoothly within the fixed tube 8. When the ball 12 moves under fluid pressure, it will drive the guide tube 11 to move together. During the movement of the guide tube 11, it squeezes the telescopic rod 9 and the compression spring 10. When the fluid pressure decreases or backflow occurs, the elastic force of the compression spring 10 will push the guide tube 11 and the ball 12 to reset, realizing the opening and closing control of the through hole 301 by the ball 12, ensuring the normal flow control and anti-backflow function of the valve. The side of the ball 12 away from the guide tube 11 is in contact with the sealing ring 17. The setting of the ring frame 16 and the sealing ring 17 enhances the connection between the through hole 301 and the ball. The sealing between the body 12 and the sealing ring 17 is well-sealed. When preventing backflow, the ball 12 can better block the through hole 301, improving the backflow prevention effect. The connecting rod 13 connects the circular plate 4 and the limiting block 14. The limiting block 14 is located in the limiting groove 101 and plays a limiting role for the circular plate 4, preventing the circular plate 4 from shifting position during fluid impact or installation. This ensures that the circular plate 4 can be stably installed on the inner side of one end of the annular seat 3, ensuring the normal fit between the filter screen 5 and the through hole 301 and the filtration effect. The bolt 15 fixes the limiting block 14 to the valve body 1. When it is necessary to replace the filter screen 5 or the sealing ring 17, simply unscrew the bolt 15 to remove the limiting block 14 from the limiting groove 101, and then remove the circular plate 4 from the annular seat 3 through the connecting rod 13. This facilitates the replacement of the filter screen 5 and the sealing ring 17. After replacement, the circular plate 4 is installed back in its original position and the bolt 15 is tightened. This improves practicality.

[0022] Finally, the following points should be noted: First, in the description of this utility model, it should be noted that, unless otherwise specified and limited, the terms "installation", "connection" and "connection" should be interpreted broadly, and can be mechanical connection or electrical connection, or internal connection between two components, or direct connection. "Up", "down", "left", "right", etc. are only used to indicate relative positional relationship. When the absolute position of the described object changes, the relative positional relationship may change. Secondly: The accompanying drawings of the embodiments disclosed in this utility model only involve the structures involved in the embodiments disclosed in this utility model. Other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of this utility model can be combined with each other. Finally: The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

[0023] The above are all preferred embodiments of this utility model, and are not intended to limit the scope of protection of this utility model. Therefore, all equivalent changes made to the structure, shape and principle of this utility model should be covered within the scope of protection of this utility model.

Claims

1. A flow control valve with an anti-backflow structure, comprising a valve body (1), characterized in that: A valve body 2 (2) is installed on the outer end of the valve body 1 (1). An annular seat (3) is installed on the inner end of the valve body 1 (1). A through hole (301) is opened on the outer side of the annular seat (3). A circular plate (4) is installed on the inner side of one end of the annular seat (3). A filter screen (5) is embedded in the outer center of the circular plate (4). A fixed seat (6) is installed on the inner end of the valve body 1 (1) away from the annular seat (3). A support frame (7) is installed between the inner side walls of the fixed seat (6). A fixed tube (8) is installed on the outer side of the support frame (7). A telescopic rod (9) is installed on the inner end of the fixed tube (8). A compression spring (10) is installed on the outer ring surface of the telescopic rod (9). A guide tube (11) is installed on one end of the telescopic rod (9) and inside the fixed tube (8). A ball (12) is installed on the end of the guide tube (11) away from the telescopic rod (9) and close to the through hole (301).

2. A flow control valve with an anti-backflow structure according to claim 1, characterized in that: The outer ring size of the circular plate (4) is adapted to the inner size of one end of the ring seat (3). When the circular plate (4) is located inside one end of the ring seat (3), the filter screen (5) fits into the through hole (301).

3. A flow control valve with an anti-backflow structure according to claim 2, characterized in that: Connecting rods (13) are installed at both ends of the circular plate (4). Limiting grooves (101) are opened on both sides of one end of the valve body (1). A limiting block (14) is installed at the end of the connecting rod (13) away from the circular plate (4) and inside the limiting groove (101).

4. A flow control valve with an anti-backflow structure according to claim 3, characterized in that: The limiting block (14) is externally embedded with a bolt (15), and one end of the bolt (15) passes through the limiting block (14) and is connected to the interior of the valve body (1).

5. A flow control valve with an anti-backflow structure according to claim 3, characterized in that: An annular frame (16) is installed on the outside of the circular plate (4) and outside the filter screen (5). A sealing ring (17) is installed at one end of the annular frame (16). When the circular plate (4) is located inside one end of the annular seat (3), the annular frame (16) and the sealing ring (17) are located inside the through hole (301) and are in contact with its inner wall. The side of the sphere (12) away from the guide tube (11) is in contact with the sealing ring (17).

6. A flow control valve with an anti-backflow structure according to claim 1, characterized in that: The outer ring surface of the guide tube (11) is slidably connected to the inner wall of the fixed tube (8), and the ball (12) can drive the guide tube (11) to move and squeeze the telescopic rod (9) and the compression spring (10) when it moves.

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