Anti-surge valve and control system thereof

Abstract

The utility model relates to valve technical field, concretely is anti-choke valve, including valve body, be equipped with valve cavity on the valve body, be equipped with valve plate in the valve cavity, the back of valve plate is fixedly connected with valve rod, and the valve plate is rotatably arranged in the valve cavity through the valve rod, its characterized in that, the back of valve plate is equipped with multiple annular flow grooves, and multiple annular flow grooves are located close to valve plate outer peripheral wall place. Can solve the problem that the vibration and noise are produced when butterfly valve uses, and the service life is short.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, specifically to an anti-surge valve and its control system. Background Technology

[0002] A butterfly valve typically consists of a valve body and a valve plate, with the valve plate rotatably mounted within the valve body. The butterfly valve controls the flow rate of the medium by rotating the valve plate at different angles. However, the instant the butterfly valve opens, the flow direction of the medium changes abruptly, from a near-parallel state to a non-parallel state. This abrupt change causes strong turbulence as the medium passes through the butterfly valve, resulting in vibration and noise.

[0003] Chinese patent CN101126457A, concerning an anti-surge butterfly valve, includes a valve body and a valve plate installed within the valve body. A guide plate is provided along the edge of the valve plate on its back side, and the guide plate has several drainage holes that direct the medium to the center of the back side of the valve plate. When the valve plate is open, part of the medium flow is guided by the drainage holes to the air chamber at the center of the back side of the valve plate. After filling this air chamber, the medium continues to flow in a direction generally consistent with the original medium flow, thereby reducing turbulence. However, this technical solution still has the following technical problems:

[0004] 1. The guide plate and drainage holes alter the flow state and pressure distribution of the medium around the valve plate, easily leading to localized stress concentration. This causes greater stress at the connection between the valve plate and the valve stem. Prolonged exposure to this uneven stress accelerates mechanical wear at the valve stem-valve plate connection, affecting valve stability, sealing performance, opening and closing accuracy, and shortening valve lifespan. The complex shape and placement requirements of the guide plate and drainage holes also increase manufacturing difficulty and cost.

[0005] 2. The valve stem is usually inserted inside the valve plate and fixedly connected to the valve plate. It is difficult to inspect the relationship between the valve stem and the valve plate by visual inspection. Auxiliary equipment is required for inspection, which makes maintenance difficult, costly and inefficient. Utility Model Content

[0006] This utility model provides an anti-surge valve and its control system, which can solve the problems of vibration and noise during the use of butterfly valves and their short service life.

[0007] This application provides the following technical solution:

[0008] An anti-surge valve includes a valve body with a valve cavity and a valve plate inside the valve cavity. The back of the valve plate is fixedly connected to a valve stem, and the valve plate is rotatably mounted inside the valve cavity via the valve stem. The valve plate is characterized in that the back of the valve plate has multiple annular guide grooves located near the outer peripheral wall of the valve plate.

[0009] The anti-surge valve control system includes an intelligent positioner, a filter pressure reducing valve, a multiplexer, a pneumatic amplifier, a pneumatic actuator, a three-way solenoid valve, a check valve, a quick-release valve, and a two-way solenoid valve. The filter pressure reducing valve's inlet is connected to an air source, its outlet is connected to the intelligent positioner's inlet, its outlet is connected to the multiplexer's inlet via the three-way solenoid valve, and its outlet is connected to the multiplexer's inlet (F port), the pneumatic amplifier's inlet, and the air tank via a check valve. The intelligent positioner's A outlet is connected to the multiplexer's A inlet; the intelligent positioner's B outlet is connected to the multiplexer's D inlet; the multiplexer's B outlet is connected to a quick-exhaust valve; the quick-exhaust valve is connected to the upper chamber of the pneumatic actuator; a two-way solenoid valve is installed between the quick-exhaust valve and the pneumatic actuator; needle valves are connected in parallel on the air supply lines on both sides of the quick-exhaust valve; the multiplexer's E outlet is connected to the control port of the pneumatic amplifier via a pipeline; the pneumatic amplifier's outlet is connected to the lower chamber of the pneumatic actuator; a needle valve is installed between the quick-exhaust valve's outlet and the pneumatic amplifier's outlet. The intelligent positioner is electrically connected to a signal converter, and the signal converter is electrically connected to a DCS / PLC controller.

[0010] Beneficial effects: After the anti-surge valve opens, the fluid medium flows from the open gap to the annular guide groove on the back of the valve plate. The annular guide groove guides the fluid medium to flow along a specific path, making the originally chaotic fluid flow orderly, thus acting as a flow straightener. This reduces internal collisions and vortex formation within the fluid medium, reduces turbulence and eddies, improves the stability of the fluid passing through the valve, and effectively reduces valve vibration and noise. The annular guide groove evenly distributes the fluid medium pressure on the valve plate, avoiding localized stress concentration, reducing wear on the valve stem and valve connection, ensuring valve opening and closing accuracy, and extending valve service life. The number and shape of the annular guide groove can be adjusted according to specific needs to meet the requirements of different application scenarios. The anti-surge valve has a simple structure, is easy to implement, has low processing difficulty, and low production cost.

[0011] The anti-surge valve control system, through the coordinated work of components such as intelligent positioner, multiplexer, and pneumatic amplifier, achieves precise control and rapid response of the anti-surge valve opening. It can achieve fast opening and slow closing to avoid surge, and can also quickly open the anti-surge valve to protect the fan in emergency situations (loss of air or power).

[0012] Furthermore, the cross-section of the annular guide channel has a composite geometry, consisting of a rectangular cross-section at the top and a spherical or conical cross-section at the bottom.

[0013] Beneficial effects: Rectangular cross-sections facilitate the smooth entry of fluid media, while spherical or conical cross-sections help guide the fluid media to change direction smoothly, reducing turbulence and energy loss, and improving flow efficiency. Composite geometric shapes of guide channels can handle different flow velocities and fluid characteristics, making them more widely applicable.

[0014] Furthermore, the ratio of the innermost radius of the annular guide groove to the outer radius of the valve plate is 8.2 to 8.5:10.

[0015] Beneficial effects: The above ratio ensures smooth flow of the fluid medium between the annular guide channel and the valve plate, reducing turbulence and energy loss, and improving flow efficiency.

[0016] Furthermore, the valve plate has an annular flange on its back side, and connecting parts are symmetrically arranged on the annular flange.

[0017] Beneficial effects: The annular flange increases the rigidity of the valve plate, making it better able to withstand fluid pressure and mechanical stress, and reducing the risk of deformation. It also reduces friction between the valve stem and the valve plate, extending the lifespan of both the valve stem and the valve plate.

[0018] Furthermore, the connector is provided with an observation window.

[0019] Beneficial effects: The observation window allows for monitoring of the valve stem and valve plate's operating status, facilitating timely detection of abnormalities. During installation, the window enables visual inspection of the valve stem and valve plate connection, ensuring installation accuracy. In later maintenance, personnel can perform inspections without disassembling the valve plate, reducing maintenance time, workload, and costs.

[0020] Furthermore, the connector and valve stem are provided with corresponding markings.

[0021] Beneficial effects: The markings help observers quickly determine the operating status of the valve stem and valve plate, simplify the observation process, and improve observation efficiency.

[0022] Furthermore, the valve body has a valve seat inside the valve cavity, the valve seat is opposite to the outer peripheral wall of the valve plate, and a sealing ring is provided on the outer peripheral wall of the valve plate.

[0023] Beneficial effects: Effectively prevents fluid leakage and improves the sealing performance of the anti-surge valve.

[0024] Furthermore, the control system includes a sensor for detecting the position of the valve plate.

[0025] Beneficial effects: Existing intelligent positioners typically monitor valve operation by collecting real-time position and movement data of the valve stem. Sensors directly detect the real-time position and movement of the valve plate, providing more accurate valve operation information, avoiding errors caused by deviations between the valve stem and valve plate, improving valve control precision, and meeting the needs of complex operating conditions. Attached Figure Description

[0026] Figure 1 This is a partial cross-sectional view of Embodiment 1 of the anti-surge valve of this utility model.

[0027] Figure 2 This is a rear view of the valve plate of Embodiment 1 of the anti-surge valve of this utility model.

[0028] Figure 3 This is a schematic diagram of the control system structure of Embodiment 1 of the anti-surge valve of this utility model.

[0029] Figure 4 This is a partial cross-sectional view of Embodiment 2 of the anti-surge valve of this utility model. Detailed Implementation

[0030] The following detailed description illustrates the specific implementation method:

[0031] The markings in the accompanying drawings include: valve body 1, valve plate 2, valve stem 3, valve seat 4, annular guide groove 5, connector 6, annular flange 7, observation window 8, marking 9, intelligent positioner 10, filter pressure reducing valve 11, multiplexer 12, pneumatic amplifier 13, pneumatic actuator 14, three-way solenoid valve 15, check valve 16, quick exhaust valve 17, two-way solenoid valve 18, needle valve 19, and air tank 20.

[0032] Example 1

[0033] like Figures 1 to 3 As shown, the anti-surge valve includes a valve body 1 with a valve cavity. A valve plate 2 is located within the valve cavity, and its back side is fixedly connected to a valve stem 3. The valve plate 2 is rotatably mounted within the valve cavity via the valve stem 3. The valve stem 3 passes through the valve body 1 and connects to a pneumatic actuator, which is positioned above the valve body 1. An annular flange 7 is located on the back side of the valve plate 2, and two connecting pieces 6 are symmetrically arranged on the annular flange 7. The valve plate 2 is fixedly connected to the valve stem 3 via the connecting pieces 6. Each connecting piece 6 has a through hole, and the connecting piece 6 is fitted onto the valve stem 3 through the mounting hole and fixed by rivets or pins, thus achieving a fixed connection between the valve stem 3 and the valve plate 2. A valve seat 4 is located within the valve cavity of the valve body 1, facing the outer peripheral wall of the valve plate 2. A sealing ring is located on the outer peripheral wall of the valve plate 2. A sealing component is provided between the valve body 1 and the pneumatic actuator. The valve stem 3 passes through a sealing cavity provided on the sealing component and connects to the pneumatic actuator. The sealing cavity is filled with sealing packing.

[0034] The valve plate 2 has six annular guide grooves 5 on its back side, located near the outer peripheral wall of the valve plate 2. The annular guide grooves 5 are located outside the annular flange 7. The cross-section of the annular guide groove 5 has a composite geometric shape, consisting of a rectangular section at the top (i.e., at the groove opening) and a spherical section at the bottom (i.e., at the groove bottom). The ratio of the radius R1 of the inner circumference of the annular flange 7 to the radius R of the outer circumference of the valve plate 2 is 4–5:10; the ratio of the radius R2 of the outer circumference of the annular flange 7 to the radius R of the outer circumference of the valve plate 2 is 7–8:10; and the ratio of the radius R3 of the innermost inner peripheral wall of the annular guide groove to the radius R of the outer circumference of the valve plate 2 is 8.2–8.5:10.

[0035] After the anti-surge valve is opened, the fluid medium flows from the open gap into the annular guide groove 5. The annular guide groove 5 guides the fluid medium to flow along a certain path, making the originally chaotic fluid medium flow orderly, playing a rectification role, reducing mutual collisions and vortex formation within the fluid medium, thereby mitigating turbulence.

[0036] The anti-surge valve control system includes an intelligent positioner 10, a filter pressure reducing valve 11, a multiplexer 12, a pneumatic amplifier 13, a pneumatic actuator 14, a three-way solenoid valve 15, a one-way valve 16, a quick-release valve 17, and a two-way solenoid valve 18. The air inlet of the filter pressure reducing valve 11 is connected to an air source, and the air outlet of the filter pressure reducing valve 11 is connected to the air inlet of the intelligent positioner 10. The air outlet of the filter pressure reducing valve 11 is connected to the air inlet of the multiplexer 12 via the three-way solenoid valve 15. The air outlet of the filter pressure reducing valve 11 is connected to the F-inlet of the multiplexer 12, the air inlet of the pneumatic amplifier 13, and the air tank 20 via the one-way valve 16. The A outlet of the intelligent positioner 10 is connected to the A inlet of the multiplexer 12. The B outlet of the intelligent positioner 10 is connected to the D inlet of the multiplexer 12. The B outlet of the multiplexer 12 is connected to the quick exhaust valve 17. The quick exhaust valve 17 is connected to the upper chamber of the pneumatic actuator 14. A two-way solenoid valve 18 is provided between the quick exhaust valve 17 and the pneumatic actuator 14. Needle valves 19 are connected in parallel on the air supply pipelines on both sides of the quick exhaust valve 17. The E outlet of the multiplexer 12 is connected to the control port of the pneumatic amplifier 13 via a pipeline. The outlet of the pneumatic amplifier 13 is connected to the lower chamber of the pneumatic actuator 14. A needle valve 19 is provided between the outlet of the quick exhaust valve 17 and the outlet of the pneumatic amplifier 13. The intelligent positioner 10 is used to monitor the working status of the valve and the pneumatic actuator 14 in real time. The intelligent positioner 10 is electrically connected to the signal converter, which is electrically connected to the DCS / PLC controller, facilitating real-time monitoring and adjustment of the valve status and improving the intelligence level of the control system. The air tank 20 is used to store compressed air as a backup air source, providing temporary air supply when the main air source is interrupted, ensuring the continuous operation of the system.

[0037] The usage method is as follows:

[0038] Under normal operating conditions, the two-way solenoid valve 18 and the three-way solenoid valve 15 are energized. Ports A and B of the three-way solenoid valve 15 are connected, while ports A and B of the two-way solenoid valve 18 are disconnected. At this time, the air after passing through the filter pressure reducing valve 11 is divided into three paths. One path goes through the one-way valve 16 to the F port of the multi-way converter 12, the pneumatic amplifier 13, and the air tank 20. Another path goes through the three-way solenoid valve 15 to the SUP inlet of the multi-way converter 12. The air pressure at the SUP inlet compresses the internal spring of the multi-way converter 12. Thus, in the internal air path of the multi-way converter 12, ports A and B are connected, and ports D and E are connected. The third path goes to the air inlet of the intelligent positioner 10, serving as the air source for the intelligent positioner 10. When the control signal output from the PLC controller to the intelligent positioner 10 increases, the output from port A of the intelligent positioner 10 increases, and the output from port B decreases. The increased air pressure at port A, after passing through ports A and B of the multiplexer 12 and the quick-release valve 17, acts on the upper chamber of the pneumatic actuator. The air pressure at port B, after passing through ports D and E of the multiplexer 124, reaches the control port of the pneumatic amplifier 13, serving as the input signal for the pneumatic amplifier 13, controlling the pressure output from the pneumatic amplifier 13 to the lower chamber of the pneumatic actuator. At this time, the pressure in the upper chamber of the pneumatic actuator is greater than the pressure in the lower chamber and the force exerted on the butterfly plate by the pipeline air pressure, pushing the piston downward and reducing the valve opening. Conversely, when the control signal output from the PLC controller to the intelligent positioner 10 decreases, the output from port A of the intelligent positioner 10 decreases, and the intelligent output from port B increases. At this time, due to the action of the quick-release valve 17 and the pneumatic amplifier 13, the piston moves upward rapidly, and the valve opens quickly.

[0039] Example 2

[0040] like Figure 4 As shown, the difference between this embodiment and Embodiment 1 is that the connecting piece 6 of the valve plate 2 is provided with an observation window 8 for observing the connection between the valve stem 3 and the valve plate 2. The connecting piece 6 and the valve stem 3 are provided with corresponding markings 9, including scales and markings. Specifically, the connecting piece 6 of the valve plate 2 has a first marking near the observation window 8, and the valve stem 3 has a second marking that cooperates with the first marking. When the valve plate 2 is precisely fixed to the valve stem 3, the first marking corresponds to the second marking. After prolonged use, wear will occur between the valve stem 3 and the valve plate 2, causing a shift in the relative position of the valve plate 2. Through the observation window 8 and the markings 9, it is possible to visually observe whether the valve plate 2 has shifted, as well as the degree and angle of the shift, thereby quickly determining whether replacement or repair is needed, improving maintenance efficiency.

[0041] Example 3

[0042] The difference between this embodiment and Embodiment 1 is that the anti-surge valve control system also includes a sensor for detecting the valve plate position. The sensor and the intelligent positioner are electrically connected to the DCS / PLC controller via signal converters. Specifically, the sensor can be a Hall sensor. A magnet is mounted on the valve plate, and the Hall sensor is installed at a suitable position on the valve body. When the valve plate rotates, the magnetic field of the magnet changes. The Hall sensor can detect this change in magnetic field and convert it into an electrical signal, which is then transmitted to the controller via the signal converter. Existing intelligent positioners typically monitor the valve's operating status by collecting the real-time position and movement of the valve stem. The controller determines whether there is a relative offset between the valve plate and the valve stem by comparing the data from the intelligent positioner and the sensor.

[0043] The above are merely embodiments of this utility model, and the utility model is not limited to the field covered by this embodiment. Commonly known structures and characteristics in the solutions are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the structure of this utility model, and these should also be considered within the scope of protection of this utility model. These modifications will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. An anti-surge valve, comprising a valve body, a valve cavity on the valve body, a valve plate disposed within the valve cavity, the back of the valve plate being fixedly connected to a valve stem, and the valve plate being rotatably disposed within the valve cavity via the valve stem, characterized in that, The valve plate has multiple annular guide grooves on its back side, and these annular guide grooves are located near the outer peripheral wall of the valve plate.

2. The anti-surge valve according to claim 1, characterized in that: The cross-section of the annular guide channel has a composite geometric shape, consisting of a rectangular section at the top and a spherical or conical section at the bottom.

3. The anti-surge valve according to claim 1, characterized in that: The ratio of the innermost radius of the annular guide groove to the outer radius of the valve plate is 8.2 to 8.5:

10.

4. The anti-surge valve according to claim 1, characterized in that: The valve plate has an annular flange on its back side, and connecting parts are symmetrically arranged on the annular flange.

5. The anti-surge valve according to claim 4, characterized in that: The connector is equipped with an observation window.

6. The anti-surge valve according to claim 5, characterized in that: The connector and valve stem are provided with corresponding markings.

7. The anti-surge valve according to claim 1, characterized in that: The valve body has a valve seat inside the valve cavity, which is opposite to the outer peripheral wall of the valve plate. A sealing ring is provided on the outer peripheral wall of the valve plate.

8. A control system for an anti-surge valve according to any one of claims 1-7, characterized in that: This system includes a smart positioner, a filter pressure reducing valve, a multiplexer, a pneumatic amplifier, a pneumatic actuator, a three-way solenoid valve, a check valve, a quick-exhaust valve, and a two-way solenoid valve. The filter pressure reducing valve's inlet is connected to an air source, and its outlet is connected to the smart positioner's inlet. The filter pressure reducing valve's outlet is connected to the multiplexer's inlet via the three-way solenoid valve. The filter pressure reducing valve's outlet is also connected to the multiplexer's F inlet, the pneumatic amplifier's inlet, and the air tank via a check valve. The smart positioner's A outlet is connected to the multiplexer's A inlet, and its B outlet is connected to... The system is connected to the D inlet of the multiplexer, the B outlet of the multiplexer is connected to the quick exhaust valve, the quick exhaust valve is connected to the upper chamber of the pneumatic actuator, a two-way solenoid valve is provided between the quick exhaust valve and the pneumatic actuator, needle valves are connected in parallel on the air supply lines on both sides of the quick exhaust valve, the E outlet of the multiplexer is connected to the control port of the pneumatic amplifier via a pipeline, the outlet of the pneumatic amplifier is connected to the lower chamber of the pneumatic actuator, a needle valve is provided between the outlet of the quick exhaust valve and the outlet of the pneumatic amplifier, the intelligent positioner is electrically connected to the signal converter, and the signal converter is electrically connected to the DCS / PLC controller.

9. The control system for the anti-surge valve according to claim 8, characterized in that: The control system includes sensors for detecting the position of the valve plate.

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