Anti-surge valve

Abstract

The invention relates to the technical field of valves, in particular to an anti-surge valve which comprises a valve body, a valve cavity is formed in the valve body, a valve plate is arranged in the valve cavity, the back face of the valve plate is fixedly connected with a valve rod, and the valve plate is rotatably arranged in the valve cavity through the valve rod. The multiple annular flow guide grooves are located in the position close to the outer circumferential wall of the valve plate. The problems that vibration and noise are generated when the butterfly valve is used, and the service life is short can be solved.

Description

Technical Field

[0001] The invention relates to the technical field of valves, in particular to an anti-surge valve. Background Art

[0002] A butterfly valve usually includes a valve body and a valve plate, which is rotatably installed in the valve body. The butterfly valve controls the flow of the medium by rotating the valve plate. When the butterfly valve is opened, the flow direction of the medium changes suddenly from the original approximately parallel state to a non-parallel state. This sudden change will cause strong turbulence when the medium passes through the butterfly valve, which will generate vibration and noise.

[0003] The Chinese patented anti-surge butterfly valve with publication number CN101126457A includes a valve body and a valve plate installed in the valve body. A guide plate is provided on the back of the valve plate along the edge of the valve plate. The guide plate is provided with a plurality of drainage holes to guide the medium to the center of the back of the valve plate. When the valve plate is opened, the medium flow will be partially guided to the air chamber at the center of the back of the valve plate under the guidance of the drainage holes. After filling the air chamber, it will continue to move forward in the same direction as the original medium flow, thereby reducing the turbulence phenomenon. However, this technical solution still has the following technical problems:

[0004] 1. The guide plate and drainage holes change the flow state and pressure distribution of the medium around the valve plate, which is prone to local force concentration, causing greater stress on the connection between the valve plate and the valve stem. Long-term uneven force will accelerate the mechanical wear of the connection between the valve stem and the valve plate, affecting the stability and sealing of the valve, affecting the opening and closing accuracy of the valve, and shortening the service life of the valve. The complex shape and position requirements of the guide plate and drainage holes will also increase the difficulty and cost of processing.

[0005] 2. The valve stem is usually inserted into the inner side of the valve plate and fixedly connected to the valve plate. It is difficult to detect the situation between the valve stem and the valve plate by appearance. Auxiliary equipment is required for detection, which makes maintenance difficult, costly and efficient. Summary of the invention

[0006] The invention provides an anti-surge valve, which can solve the problems of vibration and noise generated when the butterfly valve is used and short service life.

[0007] This application provides the following technical solutions:

[0008] An anti-surge valve comprises a valve body, a valve cavity is provided on the valve body, a valve plate is provided in the valve cavity, the back of the valve plate is fixedly connected to the valve stem, and the valve plate is rotatably arranged in the valve cavity through the valve stem. It is characterized in that a plurality of annular guide grooves are provided on the back of the valve plate, and the plurality of annular guide grooves are located near the outer peripheral wall of the valve plate.

[0009] The control system of the anti-surge valve 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 exhaust valve, and a two-way solenoid valve. The air inlet of the filter pressure reducing valve is connected to the air source, the air outlet of the filter pressure reducing valve is connected to the air inlet of the intelligent positioner, the air outlet of the filter pressure reducing valve is connected to the air inlet of the multiplexer via a three-way solenoid valve, and the air outlet of the filter pressure reducing valve is connected to the F air inlet of the multiplexer, the air inlet of the pneumatic amplifier, and the air storage tank via a check valve. The A outlet of the intelligent positioner is connected to the A inlet of the multiplexer, the B outlet of the intelligent positioner 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 gas pipelines on both sides of the quick exhaust valve, the E outlet of the multiplexer is connected to the control port of the pneumatic amplifier through the pipeline, the outlet of the pneumatic amplifier is connected to the lower chamber of the pneumatic actuator, and 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.

[0010] Beneficial effects: After the anti-surge valve is opened, the fluid medium flows from the open gap to the annular guide groove on the back of the valve plate. The annular guide groove will guide the fluid medium to flow along a certain path, making the originally chaotic flow of the fluid medium orderly, playing a role of rectification, reducing the mutual collision and vortex formation inside the fluid medium, reducing the generation of turbulence and eddy currents, improving the stability of the fluid when passing through the valve, and effectively reducing the vibration and noise generated by the valve. The annular guide groove evenly distributes the pressure of the fluid medium on the valve plate, avoids local stress concentration, reduces wear on the connection between the valve stem and the valve, ensures the opening and closing accuracy of the valve, and extends the service life of the valve. 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 has low production costs.

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

[0012] Furthermore, the cross section of the annular guide groove presents a composite geometric shape, which is composed of a rectangular cross section at the top and a spherical or conical cross section at the bottom.

[0013] Beneficial effects: The rectangular cross section facilitates the smooth entry of the fluid medium, while the spherical or conical cross section helps guide the fluid medium to turn smoothly, reduce turbulence and energy loss, and improve flow efficiency. The composite geometric guide groove can cope with different flow rates and fluid characteristics and has a wider applicability.

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

[0015] Beneficial effects: The above ratio ensures that the fluid medium flows smoothly between the annular guide groove and the valve plate, reduces turbulence and energy loss, and improves flow efficiency.

[0016] Furthermore, an annular flange is provided on the back side of the valve plate, and connecting pieces are symmetrically provided on the annular flange.

[0017] Beneficial effects: The annular flange increases the rigidity of the valve plate, making it more able to withstand fluid pressure and mechanical stress, reducing the risk of deformation. At the same time, it reduces the friction between the valve stem and the valve plate, extending the life of the valve stem and valve plate.

[0018] Furthermore, an observation window is provided on the connecting piece.

[0019] Beneficial effects: The operating status of the valve stem and valve plate can be observed through the observation window, which is convenient for timely detection of abnormalities. During the installation process, the connection between the valve stem and the valve plate can be visually observed through the observation window to ensure the installation accuracy of the valve plate and the valve stem; in the later maintenance process, maintenance personnel can check without disassembling the valve plate, reducing maintenance time and workload, and reducing maintenance costs.

[0020] Furthermore, corresponding markings are provided on the connecting piece and the valve stem.

[0021] Beneficial effect: The marking helps observers quickly determine the operating status of the valve stem and valve plate, simplifies the observation steps, and improves the observation efficiency.

[0022] Furthermore, a valve seat is provided in the valve cavity of the valve body, 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 prevent fluid leakage and improve the sealing performance of the anti-surge valve.

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

[0025] Beneficial effects: Existing intelligent positioners usually monitor the working status of valves by collecting the real-time position and movement status of valve stems. The sensor directly detects the real-time position and movement status of valve plates, provides more accurate valve working status information, avoids errors caused by deviations between valve stems and valve plates, improves valve control accuracy, and can meet complex working conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a partial cross-sectional view of the first embodiment of the anti-surge valve of the present invention.

[0027] Figure 2 This is a back view of the valve plate of the first embodiment of the anti-surge valve of the present invention.

[0028] Figure 3 It is a schematic diagram of the control system structure of the first embodiment of the anti-surge valve of the present invention.

[0029] Figure 4 It is a partial cross-sectional view of the second embodiment of the anti-surge valve of the present invention. DETAILED DESCRIPTION

[0030] The following is further described in detail through specific implementation methods:

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

[0032] Embodiment 1

[0033] like Figures 1 to 3 As shown, the anti-surge valve comprises a valve body 1, a valve cavity is provided on the valve body 1, a valve plate 2 is provided in the valve cavity, the back of the valve plate 2 is fixedly connected to the valve stem 3, and the valve plate 2 is rotatably arranged in the valve cavity through the valve stem 3. The valve stem 3 passes through the valve body 1 and is connected to the pneumatic actuator, and the pneumatic actuator is arranged above the valve body 1. An annular flange 7 is provided on the back of the valve plate 2, and two connecting members 6 are symmetrically provided on the annular flange 7, and the valve plate 2 is fixedly connected to the valve stem 3 through the connecting members 6. Through holes are provided on the connecting members 6, and the connecting members 6 are sleeved on the valve stem 3 through the mounting holes and fixed by rivets or pins to achieve fixed connection between the valve stem 3 and the valve plate 2. A valve seat 4 is provided in the valve cavity of the valve body 1, and the valve seat 4 is opposite to the outer peripheral wall of the valve plate 2, and a sealing ring is provided on the outer peripheral wall of the valve plate 2. A sealing component is provided between the valve body 1 and the pneumatic actuator, and the valve stem 3 passes through the sealing cavity provided on the sealing component and is connected to the pneumatic actuator, and the sealing cavity is filled with sealing filler.

[0034] Six annular flow guide grooves 5 are provided on the back of the valve plate 2, and the annular flow guide grooves 5 are located near the outer peripheral wall of the valve plate 2. The annular flow guide grooves 5 are located outside the annular flange 7. The cross section of the annular flow guide groove 5 presents a composite geometric shape, which is composed of a rectangular cross section at the upper part (i.e., at the notch) and a spherical cross section at the lower part (i.e., at the bottom of the groove). 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 to 5:10, and 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 to 8:10; the ratio of the radius R3 of the inner peripheral wall of the annular flow guide groove located at the innermost side to the radius R of the outer circumference of the valve plate 2 is 8.2 to 8.5:10.

[0035] After the anti-surge valve is opened, the fluid medium flows from the opened gap to the annular guide groove 5. The annular guide groove 5 will guide the fluid medium to flow along a certain path, making the originally chaotic flow of the fluid medium orderly, playing a rectifying role, reducing the mutual collision and vortex formation inside the fluid medium, thereby alleviating turbulence.

[0036] The control system of the anti-surge valve 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 check valve 16, a quick exhaust valve 17, and a two-way solenoid valve 18. The air inlet of the filter pressure reducing valve 11 is connected to the air source, 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, and the air outlet of the filter pressure reducing valve 11 is connected to the F air inlet of the multiplexer 12, the air inlet of the pneumatic amplifier 13, and the air storage tank 20 via the check valve 16. The A air outlet of the intelligent positioner 10 is connected to the A air inlet of the multiplexer 12, the B air outlet of the intelligent positioner 10 is connected to the D air inlet of the multiplexer 12, the B air outlet of the multiplexer 12 is connected to the quick exhaust valve 17, the quick exhaust valve 17 is communicated with the upper cavity of the pneumatic actuator 14, a two-way solenoid valve 18 is arranged between the quick exhaust valve 17 and the pneumatic actuator 14, needle valves 19 are connected in parallel on the gas supply pipelines on both sides of the quick exhaust valve 17, the E air outlet of the multiplexer 12 is connected to the control port of the pneumatic amplifier 13 through the pipeline, the air outlet of the pneumatic amplifier 13 is linked to the lower cavity of the pneumatic actuator 14, and a needle valve 19 is arranged between the air outlet of the quick exhaust valve 17 and the air 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, and the signal converter is electrically connected to the DCS / PLC controller, which is convenient for 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 to ensure the continuous operation of the system.

[0037] Here’s how to use it:

[0038] When the anti-surge valve is working normally, the two-way solenoid valve 18 and the three-way solenoid valve 15 are energized, the A port and the B port of the three-way solenoid valve 15 are connected, and the A port and the B port 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 passes through the one-way valve 16 and goes to the F port of the multiplexer 12, the pneumatic amplifier 13, and the air storage tank 20 respectively; one path passes through the three-way solenoid valve 15 and goes to the SUP air inlet of the multiplexer 12. The air pressure at the SUP air inlet compresses the internal spring of the multiplexer 12. In this way, in the internal air circuit of the multiplexer 12, the A port and the B port are connected, and the D port and the E port are connected; the other path goes to the air inlet of the intelligent positioner 10 as the air source of the intelligent positioner 10. When the control signal output by the PLC controller to the intelligent positioner 10 increases, the output of the A port of the intelligent positioner 10 increases, and the output of the B port decreases. The increased air pressure of the A port acts on the upper chamber of the pneumatic actuator through the A port, B port, and quick exhaust valve 17 of the multiplexer 12; the air pressure of the B port passes through the D port and E port of the multiplexer 124 to the control port of the pneumatic amplifier 13, and serves as the input signal of the pneumatic amplifier 13 to control the pressure of the pneumatic amplifier 13 output to the lower chamber of the pneumatic actuator; at this time, the pressure of the upper chamber of the pneumatic actuator is greater than the pressure of the lower chamber and the force of the pipeline wind pressure on the butterfly plate, pushing the piston downward and reducing the valve opening. Conversely, when the control signal output by the PLC controller to the intelligent positioner 10 decreases, the output of the A port of the intelligent positioner 10 decreases, and the B intelligent output increases. At this time, due to the action of the quick exhaust valve 17 and the pneumatic amplifier 13, the piston moves upward quickly and the valve is opened quickly.

[0039] Embodiment 2

[0040] like Figure 4 As shown, the difference between this embodiment and the first embodiment is that an observation window 8 is provided on the connecting member 6 of the valve plate 2 for observing the connection between the valve stem 3 and the valve plate 2. Corresponding markings 9 are provided on the connecting member 6 and the valve stem 3, and the markings 9 include scales, marks, etc. Specifically, a first marking is provided on the connecting member 6 of the valve plate 2 near the observation window 8, and a second marking matching the first marking is provided on the valve stem 3. When the valve plate 2 is precisely fixed on the valve stem 3, the first marking corresponds to the second marking. After the valve body 1 is used for a long time, wear will occur between the valve stem 3 and the valve plate 2, causing the relative position of the valve plate 2 to shift. Through the observation window 8 and the marking 9, it is possible to visually observe whether the valve plate 2 is shifted, as well as the degree and angle of the shift, so that it is possible to quickly determine whether it needs to be replaced or repaired, thereby improving the maintenance efficiency.

[0041] Embodiment 3

[0042] The difference between this embodiment and the first embodiment is that the control system of the anti-surge valve also includes a sensor for detecting the position of the valve plate, and the sensor and the intelligent positioner are electrically connected to the DCS / PLC controller through a signal converter. Specifically, the sensor can adopt a Hall sensor, a magnet is installed 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, and the Hall sensor can detect this magnetic field change and convert it into an electrical signal, and send the information of the valve plate to the controller through the signal converter. Existing intelligent positioners usually monitor the working state of the valve by collecting the real-time position and movement state of the valve stem. The controller determines whether the valve plate and the valve stem are relatively offset by comparing the data of the intelligent positioner and the sensor.

[0043] The above are only embodiments of the present invention. The invention is not limited to the field involved in this implementation case. The common knowledge such as the known specific structure and characteristics in the scheme is not described in detail here. It should be pointed out that for those skilled in the art, several deformations and improvements can be made without departing from the structure of the present invention, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records 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 being provided on the valve body, a valve plate being provided in the valve cavity, the back of the valve plate being fixedly connected to a valve stem, the valve plate being rotatably arranged in the valve cavity through the valve stem, characterized in that: A plurality of annular guide grooves are arranged on the back side of the valve plate, and the plurality of 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 groove presents a composite geometric shape, which is composed of a rectangular cross section at the top and a spherical or conical cross section at the bottom.

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

10.

4. The anti-surge valve according to claim 1, characterized in that: An annular flange is arranged on the back of the valve plate, and connecting pieces are symmetrically arranged on the annular flange.

5. The anti-surge valve according to claim 4, characterized in that: An observation window is provided on the connecting piece.

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

7. The anti-surge valve according to claim 1, characterized in that: A valve seat is arranged in the valve cavity of the valve body, the valve seat is opposite to the outer peripheral wall of the valve plate, and a sealing ring is arranged 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 to 7, characterized in that: It includes an intelligent positioner, a filter pressure reducing valve, a multiplexer, a pneumatic amplifier, a pneumatic actuator, a three-way solenoid valve, a one-way valve, a quick exhaust valve, and a two-way solenoid valve. The air inlet of the filter pressure reducing valve is connected to the air source, the air outlet of the filter pressure reducing valve is connected to the air inlet of the intelligent positioner, the air outlet of the filter pressure reducing valve is connected to the air inlet of the multiplexer through the three-way solenoid valve, and the air outlet of the filter pressure reducing valve is connected to the F air inlet of the multiplexer, the air inlet of the pneumatic amplifier, and the air storage tank through the one-way valve. The A outlet of the intelligent positioner is connected to the A inlet of the multiplexer, the B outlet of the intelligent positioner 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 gas pipelines on both sides of the quick exhaust valve, the E outlet of the multiplexer is connected to the control port of the pneumatic amplifier through the pipeline, the outlet of the pneumatic amplifier is connected to the lower chamber of the pneumatic actuator, and 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 anti-surge valve according to claim 8, characterized in that: The control system includes a sensor for detecting a position of the valve plate.

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