A backflow prevention control valve

Abstract

The utility model relates to fluid control technical field discloses a kind of backflow prevention control valves, including flange plate, the flange plate outer wall is fixedly connected with connecting pipe, the connecting pipe outer wall is fixedly connected with shell one, the shell one inner wall is provided with ball valve core, the ball valve core inner wall is provided with backflow prevention assembly, the shell one top is provided with sealing assembly, the shell one top is provided with rotating rod, the backflow prevention assembly includes baffle, the baffle outer wall is arranged in ball valve core inner wall, the ball valve core inner wall is fixedly connected with limit plate. In the utility model, fluid moves baffle inward by baffle, compresses spring one, fluid passes from the gap between baffle and ball valve core, when pressure reduces, spring one rebounds, promotes baffle to move outward to adhere to limit plate, prevents fluid backflow, solve the problem that traditional equipment is easy to system pressure imbalance, damage to equipment, reach the effect of protection and prolong equipment life.

Description

Technical Field

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

[0002] In numerous fields such as industrial production, municipal water supply, and HVAC, the stable operation of fluid transport systems is crucial. Control valves, as core components regulating fluid flow, pressure, and other parameters, directly impact the safety and efficiency of the entire system. Preventing fluid backflow is one of the key functions of control valves. A control valve capable of reliably preventing backflow can effectively avoid various system problems caused by reverse fluid flow, thus having wide application demand and significant practical value in the field of fluid control.

[0003] In existing technologies, there are many types of common control valves. For example, gate valves open and close the passage by raising and lowering a gate, which moves perpendicular to the fluid flow direction and relies on the tight fit between the gate and the valve seat to achieve a seal. Butterfly valves control flow by rotating a butterfly plate around an axis within the valve body, and the rotation angle of the butterfly plate determines the flow area of ​​the passage. Gate valves regulate fluid flow by raising and lowering the valve disc along the axial direction, changing the gap between the valve disc and the valve seat; the sealing surfaces of the valve disc and valve seat are mostly conical. The working principle of these valves is based on the mechanical drive of the opening and closing elements, and by changing the relative position between the opening and closing elements and the valve seat, the fluid flow state is controlled.

[0004] However, some traditional control valves lack effective anti-backflow design in practical applications. When the fluid pressure in the system fluctuates or suddenly decreases, the fluid is prone to reverse flow. This backflow not only disrupts the original pressure balance of the system, but also easily causes reverse impact on upstream equipment such as pumps and compressors, leading to wear, performance degradation or even damage to equipment components, affecting the normal operation of the entire system. Utility Model Content

[0005] To overcome the above shortcomings, this utility model provides an anti-backflow control valve, which aims to improve the problem of system pressure imbalance and equipment damage caused by the inability of traditional equipment to prevent backflow.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a backflow prevention control valve, comprising a flange, a connecting pipe fixedly connected to the outer wall of the flange, an outer shell fixedly connected to the outer wall of the connecting pipe, a ball valve core disposed on the inner wall of the outer shell, an anti-backflow component disposed on the inner wall of the ball valve core, a sealing component disposed above the outer shell, and a rotating rod disposed above the outer shell;

[0007] The anti-backflow assembly includes a baffle, the outer wall of which is disposed on the inner wall of the ball valve core. A limit plate is fixedly connected to the inner wall of the ball valve core. A support seat is fixedly connected to the inner wall of the ball valve core. A hollow rod is fixedly connected to the outer wall of the support seat. A round rod is fixedly connected to the outer wall of the baffle, and a spring is sleeved on the outer wall of the round rod.

[0008] Furthermore, the sealing assembly includes a gasket 1, the outer wall of which is disposed above a housing 1, a housing 2 is fixedly connected to the inner wall of the housing 1, a groove 2 is formed in the inner wall of the housing 2, the inner wall of the housing 2 is slidably connected to the outer wall of the gasket 1, a waterproof filler is slidably connected to the inner wall of the housing 2, a gasket 2 is slidably connected to the inner wall of the housing 2, a spring 2 is fixedly connected to the upper surface of the gasket 2, a pressure ring is fixedly connected to one end of the spring 2, a valve cover is fixedly connected to the upper surface of the pressure ring, a groove 3 is formed in the inner wall of the valve cover, a screw is rotatably connected to the inner wall of the valve cover, and a valve stem is slidably connected to the inner wall of the housing 2.

[0009] Furthermore, the inner wall of the baffle is attached to the outer wall of the limiting plate, and the limiting plate is used to axially limit the baffle.

[0010] Furthermore, a slot is formed on the upper surface of the outer casing, and the outer wall of the valve stem is slidably connected inside the slot.

[0011] Furthermore, one end of the spring is fixedly connected to the outer wall of the baffle, and the other end of the spring is fixedly connected to the outer wall of the support.

[0012] Furthermore, the outer wall of the round rod is slidably connected to the inner wall of the hollow rod, and the hollow rod is used to provide axial limiting for the movement of the round rod.

[0013] Furthermore, the outer wall of the screw is threaded into the inside of the second hole, and the outer wall of the screw is threaded into the inside of the third hole.

[0014] Furthermore, the outer wall of the valve stem is slidably connected to the inner wall of gasket one, the outer wall of the valve stem is slidably connected to the inner wall of the waterproof packing, and the outer wall of the valve stem is slidably connected to the inner wall of gasket two. The waterproof packing is made of flexible graphite material, and gasket one and gasket two are made of rubber material.

[0015] This utility model has the following beneficial effects:

[0016] 1. In this utility model, the fluid passes through the baffle, and the fluid pressure causes the baffle to move inward, compressing the spring. At the same time, the round rod moves inward, and the fluid passes through the gap between the baffle and the ball valve core. When the pressure decreases, the spring rebounds, pushing the baffle to move outward to fit the limiting plate, closing the internal channel of the ball valve core and preventing fluid backflow. This solves the problem of system pressure imbalance caused by the inability to prevent backflow in traditional equipment, which damages the equipment. It achieves the effect of protecting and extending the service life of the equipment and maintaining the efficient and stable operation of the system.

[0017] 2. In this utility model, by tightening the bolts, the valve cover is made to fit with the outer shell 2, and at the same time, the pressure ring is squeezed to compress the spring 2, so that the gasket 1, waterproof packing, gasket 2, valve stem and outer shell 2 are tightly fitted, so that the fluid does not leak out from the gap between the outer shell 2 and the valve stem, thereby improving the sealing performance of the valve and achieving the effect of preventing fluid leakage and reducing maintenance costs. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of an anti-backflow control valve proposed in this utility model;

[0019] Figure 2 This is a schematic diagram of a cross-sectional view of the outer shell of an anti-backflow control valve proposed in this utility model.

[0020] Figure 3 This is a schematic diagram of the ball valve core structure of an anti-backflow control valve proposed in this utility model;

[0021] Figure 4 This is a schematic diagram of the two cross-sectional sections of the outer shell of the anti-backflow control valve proposed in this utility model;

[0022] Figure 5 This is a schematic diagram of the waterproof packing part of an anti-backflow control valve proposed in this utility model.

[0023] Legend:

[0024] 1. Flange; 2. Connecting pipe; 3. Outer shell 1; 4. Rotating rod; 5. Groove 1; 6. Ball valve core; 7. Limiting plate; 8. Baffle; 9. Round rod; 10. Hollow rod; 11. Spring 1; 12. Support seat; 13. Outer shell 2; 14. Groove 2; 15. Gasket 1; 16. Waterproof packing; 17. Gasket 2; 18. Spring 2; 19. Pressure ring; 20. Valve cover; 21. Groove 3; 22. Screw; 23. Valve stem. Detailed Implementation

[0025] 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.

[0026] Reference Figures 1-3The present invention provides an embodiment of an anti-backflow control valve, comprising a flange 1, which is used to fix and connect to an external pipeline to achieve a sealed connection between the valve and the pipeline. A connecting pipe 2 is fixedly connected to the outer wall of the flange 1, and an outer shell 3 is fixedly connected to the outer wall of the connecting pipe 2. The connecting pipe 2 is used to connect the flange 1 and the outer shell 3. A ball valve core 6 is provided on the inner wall of the outer shell 3. The ball valve core 6 can change the on / off state of the internal channel by rotating itself. An anti-backflow component is provided on the inner wall of the ball valve core 6. A sealing component is provided on the top of the outer shell 3. A rotating rod 4 is provided on the top of the outer shell 3. The rotating rod 4 is used to drive the ball valve core 6 to rotate, thereby controlling the valve's on / off state.

[0027] The anti-backflow assembly includes a baffle 8, which is used to block the channel when the fluid flows in the opposite direction. The outer wall of the baffle 8 is set on the inner wall of the ball valve core 6. A limit plate 7 is fixedly connected to the inner wall of the ball valve core 6. A support seat 12 is fixedly connected to the inner wall of the ball valve core 6. A hollow rod 10 is fixedly connected to the outer wall of the support seat 12. The support seat 12 is used to provide stable support for the hollow rod 10. A round rod 9 is fixedly connected to the outer wall of the baffle 8. A spring 11 is sleeved on the outer wall of the round rod 9.

[0028] Reference Figures 1-5The sealing assembly includes a gasket 15, the outer wall of which is positioned above the outer casing 3. An outer casing 23 is fixedly connected to the inner wall of the outer casing 3. The gasket 15 enhances the initial seal between the valve stem 23 and the outer casing 3. The inner wall of the outer casing 23 has a slot 14 for engaging with a screw 22 to achieve a fixed connection between the outer casing 23 and the valve cover 20. The inner wall of the outer casing 23 is slidably connected to the outer wall of the gasket 15. A waterproof packing 16 is slidably connected to the inner wall of the outer casing 23. The waterproof packing 16 fills the gap through its own compression, further enhancing the seal between the valve stem 23 and the outer casing 3. The sealing performance between the outer shell 2 and 13 is achieved by a gasket 2 17 slidingly connected to the inner wall of the outer shell 2 13. Gasket 2 17 separates the waterproof filler 16 from the spring 2 18. Spring 2 18 is fixedly connected to the upper surface of gasket 2 17. Spring 2 18 continuously applies pressure to gasket 2 17 through its own elastic force, keeping the waterproof filler 16 in a compressed state to ensure the durability of the seal. A pressure ring 19 is fixedly connected to one end of spring 2 18. Pressure ring 19 evenly transmits the elastic force of spring 2 18 to gasket 2 17, preventing uneven local pressure from affecting the seal. The upper surface of pressure ring 19 is fixedly connected to... A valve cover 20 has a groove 21 on its inner wall. A screw 22 is rotatably connected to the inner wall of the valve cover 20. The screw 22 fixes the valve cover 20 to the outer shell 13 through threaded engagement with the grooves 14 and 21. It can also adjust the pressure on the pressure ring 19. A valve stem 23 is slidably connected to the inner wall of the outer shell 13. The inner wall of the baffle 8 is attached to the outer wall of the limiting plate 7. The limiting plate 7 is used to axially limit the baffle 8. A groove 5 is opened on the upper surface of the outer shell 13. The outer wall of the valve stem 23 is slidably connected to the inside of the groove 5. One end of the spring 11 is fixedly connected to the outer wall of the baffle 8. The other end of spring 11 is fixedly connected to the outer wall of support base 12. The outer wall of round rod 9 is slidably connected to the inner wall of hollow rod 10. Hollow rod 10 is used to provide axial limit for the movement of round rod 9. The outer wall of screw 22 is threadedly connected to the inside of slot 24. The outer wall of screw 22 is threadedly connected to the inside of slot 31. The outer wall of valve stem 23 is slidably connected to the inner wall of gasket 15. The outer wall of valve stem 23 is slidably connected to the inner wall of waterproof packing 16. The outer wall of valve stem 23 is slidably connected to the inner wall of gasket 27. Waterproof packing 16 is made of flexible graphite material. Gasket 15 and gasket 27 are made of rubber material.

[0029] Working principle: When a backflow prevention control valve is needed, when fluid passes through, the pressure acts on the baffle 8, pushing the baffle 8 to move inward, causing the round rod 9 to slide inward, and at the same time compressing the spring 11. The fluid flows through the gap between the baffle 8 and the ball valve core 6. When the fluid pressure decreases and backflow may occur, the spring 11 rebounds and pushes the baffle 8 to move outward, while the round rod 9 slides outward. The baffle 8 moves to fit against the limit plate 7, closing the inner channel of the ball valve core 6 and preventing fluid backflow. When manual control of closing the valve is required, rotate the rotating rod 4, causing the valve stem 23 to rotate, making the ball valve core 6 rotate and closing the valve.

[0030] Furthermore, by passing the screw 22 through the three slots 21 and the two slots 14 and tightening the screw 22, the pressure ring 19 moves downward, compressing the spring 18. When the fluid passes through the outer casing 3, the fluid enters the outer casing 13, squeezing the gasket 15. The gasket 15 squeezes the waterproof packing 16, and the waterproof packing 16 squeezes the gasket 17, making the gasket 15, the waterproof packing 16, and the gasket 17 fit tightly together, sealing the valve stem 23 and the outer casing 13, and preventing the fluid from leaking directly from the valve stem 23 and the outer casing 13.

[0031] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. 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.

Claims

1. A backflow prevention control valve, comprising a flange (1), characterized in that: The flange (1) is fixedly connected to the outer wall of the connecting pipe (2), and the outer wall of the connecting pipe (2) is fixedly connected to the outer wall of the outer shell (3). The inner wall of the outer shell (3) is provided with a ball valve core (6), the inner wall of the ball valve core (6) is provided with an anti-backflow component, the upper part of the outer shell (3) is provided with a sealing component, and the upper part of the outer shell (3) is provided with a rotating rod (4). The anti-backflow assembly includes a baffle (8), the outer wall of which is disposed on the inner wall of the ball valve core (6), a limit plate (7) is fixedly connected to the inner wall of the ball valve core (6), a support seat (12) is fixedly connected to the inner wall of the ball valve core (6), a hollow rod (10) is fixedly connected to the outer wall of the support seat (12), a round rod (9) is fixedly connected to the outer wall of the baffle (8), and a spring (11) is sleeved on the outer wall of the round rod (9).

2. The anti-backflow control valve according to claim 1, characterized in that: The sealing assembly includes a gasket (15), the outer wall of which is disposed above the outer shell (3). The inner wall of the outer shell (3) is fixedly connected to the outer shell (2) (13). The inner wall of the outer shell (2) (13) is provided with a slot (14). The inner wall of the outer shell (2) (13) is slidably connected to the outer wall of the gasket (15). The inner wall of the outer shell (2) (13) (13) (16) (16) (16) (16) (16) (17) (17) (17) (18) (18) (18) (19) (19) (19) (20) (20) (21) (21) (21) (21)) (22) (22) (23) (23) (23) (23) (24) (25) (26)) (27) (28) (28) (29) (20) (20) (21) (21) (21)) (22) (23) (24) (25) (26) (27) (28) (28) (27 ...

3. The anti-backflow control valve according to claim 1, characterized in that: The inner wall of the baffle (8) is attached to the outer wall of the limiting plate (7), and the limiting plate (7) is used to axially limit the baffle (8).

4. The anti-backflow control valve according to claim 2, characterized in that: The upper surface of the outer shell (3) is provided with a slot (5), and the outer wall of the valve stem (23) is slidably connected to the inside of the slot (5).

5. The anti-backflow control valve according to claim 1, characterized in that: One end of the spring (11) is fixedly connected to the outer wall of the baffle (8), and the other end of the spring (11) is fixedly connected to the outer wall of the support (12).

6. The anti-backflow control valve according to claim 1, characterized in that: The outer wall of the round rod (9) is slidably connected to the inner wall of the hollow rod (10), and the hollow rod (10) is used to provide axial limit for the movement of the round rod (9).

7. The anti-backflow control valve according to claim 2, characterized in that: The screw (22) is threaded on the outer wall inside the second hole (14), and the screw (22) is threaded on the outer wall inside the third hole (21).

8. A backflow prevention control valve according to claim 2, characterized in that: The outer wall of the valve stem (23) is slidably connected to the inner wall of the first gasket (15), the outer wall of the valve stem (23) is slidably connected to the inner wall of the waterproof filler (16), the outer wall of the valve stem (23) is slidably connected to the inner wall of the second gasket (17), the waterproof filler (16) is made of flexible graphite, and the first gasket (15) and the second gasket (17) are made of rubber.

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