Pre-tightening force compensation control device for conical sealing rotary valve

Abstract

The invention relates to the technical field of conical sealing rotary valve production, in particular to a pretightening force compensation control device for a conical sealing rotary valve. The device comprises a pre-tightening body, a cylinder, a piston, a ball, a displacement sensor, a pressure sensor and a controller for control, the cylinder, the piston, the ball, the displacement sensor, the pressure sensor and the controller are arranged in the pre-tightening body, in the device, after the conical surface of the rotor is abraded or thermally displaced, the ball descends, and the piston also descends under the action of a wave spring and air pressure; the displacement sensor detects the displacement of the piston in real time, the pressure sensor detects the air pressure in the air cylinder in real time and transmits signals to the controller, the controller immediately calculates the needed air pressure and controls the proportional valve pressure regulator to complete pressure regulation and recover the conical surface sealing force, manual intervention is not needed, and closed-loop control ensures that the sealing force is constant.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of cone sealing rotary valve production, in particular to a pre-tightening force compensation control device for a cone sealing rotary valve. BACKGROUND

[0002] The cone sealing rotary valve is a common type of valve, which mainly features fluid control and cutoff through the rotation of the valve core and the conical surface of the valve body. The valve has simple structure, long service life and good sealing performance, and is widely used in the fields of petroleum, chemical industry, power and metallurgy.

[0003] The cone sealing rotary valve mainly consists of a valve body, a valve cover and a valve core. The conical surface of the valve core and the valve body cooperates to form a seal and cut off the fluid. The valve cover is generally a pre-tightening force device that provides the conical surface sealing force for the valve core and the valve body. The valve is usually driven manually, electrically or pneumatically to control and operate the valve.

[0004] In the traditional cone sealing rotary valve, a set of disc springs, bellows or cylindrical compression springs are arranged at the end of the rotor shaft. The initial compression amount is set by adjusting the gasket, thereby converting the spring force into the conical sealing force. However, the spring force changes with the compression amount, and the conical wear can cause the spring compression amount to decrease and the sealing force to decrease. Moreover, to delay failure, the spring force is over-adjusted when leaving the factory, the wear rate increases exponentially, and the over-adjusted spring force when leaving the factory increases the valve rotation resistance, thereby increasing the driving cost. If hydraulic pressure is used instead of springs, there is a high risk of leakage, and the leaked oil can cause serious pollution. Moreover, in low temperature environments, the oil viscosity increases, the response lags, and pressure relief occurs during opening and closing. SUMMARY

[0005] To overcome the above-mentioned deficiencies, the present application provides a pre-tightening force compensation control device for a cone sealing rotary valve. The inner displacement sensor detects the piston displacement and the pressure sensor detects the gas pressure in the cylinder in real time, and both transmit signals to the controller. The controller calculates the required gas pressure and controls the proportional valve pressure regulator to complete pressure regulation, thereby restoring the conical sealing force.

[0006] The technical solution of the present application to solve the technical problem is: The application discloses a pre-tightening force compensation control device for a conical sealing rotary valve, which is connected with the conical sealing rotary valve, and the conical sealing rotary valve is internally provided with a valve body, a rotary valve core and a valve cover; wherein the pre-tightening force compensation control device comprises a pre-tightening body communicated with the valve body, a cylinder, a piston, a ball, a displacement sensor, a pressure sensor and a controller for control which are arranged in the pre-tightening body, the ball is arranged at the communicating position of the pre-tightening body and the cylinder, the piston is attached to the ball, the controller is connected with a proportional valve pressure regulator, the proportional valve pressure regulator is communicated with the pre-tightening body, the displacement sensor is used for detecting the displacement of the piston in real time and transmitting the detected information into the controller, the pressure sensor is used for detecting the gas pressure in the cylinder in real time and transmitting the detected information into the controller, and the controller calculates the gas pressure pressure value to be supplemented by the valve body according to the received information and controls the proportional valve pressure regulator to adjust the pressure of the valve body.

[0007] As an improvement of the application, the controller comprises a control unit for collecting the cylinder pressure and piston displacement data in real time and calculating the adjusting pressure data according to the data.

[0008] As a further improvement of the application, the pre-tightening body is internally provided with a wave spring and a boss.

[0009] As a further improvement of the application, the pre-tightening body is internally provided with a limiting copper sleeve on both sides of the ball.

[0010] As a further improvement of the application, the pre-tightening body is connected with a quick connector.

[0011] As a further improvement of the application, the pre-tightening body is provided with an O-ring.

[0012] As a further improvement of the application, the proportional valve pressure regulator is communicated with the pre-tightening body through an air pipe, and the air pipe is connected in the quick connector.

[0013] In the application, when the rotor cone surface is worn or is subjected to thermal displacement, the ball will descend, the piston will also descend under the action of the wave spring and the gas pressure, the displacement sensor detects the displacement of the piston in real time and the pressure sensor detects the gas pressure in the cylinder in real time, and both of them transmit signals to the controller, the controller calculates the required gas pressure pressure and controls the proportional valve pressure regulator to complete the pressure adjustment, so that the sealing force of the cone surface is recovered, manual intervention is not needed, and the closed-loop control ensures that the sealing force is constant. BRIEF DESCRIPTION OF DRAWINGS

[0014] In order to facilitate the description, the application is described in detail by the preferred embodiments and the drawings.

[0015] Figure 1This is a schematic diagram of the connection structure between the preload compensation control device for a conical sealing rotary valve and the valve body according to the present invention; Figure 2 This is an exploded view of the connection between the preload compensation control device for a conical sealing rotary valve and the valve body according to the present invention; Figure 3 This is a schematic diagram of a preload compensation control device for a conical sealing rotary valve according to the present invention; Figure 4 This is a side view of a preload compensation control device for a conical sealing rotary valve according to the present invention; Figure 5 This is a top view of a preload compensation control device for a conical sealing rotary valve according to the present invention; Figure 6 This is a cross-sectional view of a preload compensation control device for a conical sealing rotary valve according to the present invention; Reference numerals: 1-valve body, 11-rotary valve core, 2-preload body, 21-cylinder, 22-piston, 23-ball bearing, 24-displacement sensor, 25-pressure sensor, 26-wave spring, 27-limiting copper sleeve, 28-quick connector, 29-O-ring. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0018] like Figures 1 to 6 As shown, the present invention provides a preload compensation control device for a conical sealing rotary valve, which is connected to the conical sealing rotary valve.

[0019] In this invention, the conical sealing rotary valve is provided with a valve body 1, a rotating valve core 11, and a valve cover.

[0020] The present invention provides a preload compensation control device for a conical sealing rotary valve, comprising a preload body 2 connected to a valve body 1, and a cylinder 21, a piston 22, a ball bearing 23, a displacement sensor 24, a pressure sensor 25, and a controller disposed within the preload body 2.

[0021] In this invention, the ball bearing 23 is disposed at the communication point between the preload body 2 and the cylinder 21, and the piston 22 is attached to the ball bearing 23.

[0022] In this invention, the controller is connected to the proportional valve pressure regulator, the proportional valve pressure regulator is connected to the pre-tightening body 2, the displacement sensor 24 is used to detect the displacement of the piston 22 in real time and transmit the detected information to the controller, the pressure sensor 25 is used to detect the gas pressure in the cylinder in real time and transmit the detected information to the controller, the controller calculates the gas pressure value to be added to the valve body 1 according to the received information and controls the proportional valve pressure regulator to adjust the pressure of the valve body.

[0023] In this invention, after the rotor cone surface is worn or thermally displaced, the ball bearing 23 will descend accordingly. Under the action of the wave spring 26 and air pressure, the piston 22 will also descend. The displacement sensor 24 detects the piston displacement in real time, and the pressure sensor 25 detects the gas pressure in the cylinder in real time, and both transmit the signals to the controller. The controller then calculates the required air pressure and controls the proportional valve pressure regulator to complete the pressure regulation, restoring the cone surface sealing force. No manual intervention is required, and the closed-loop control ensures that the sealing force is constant.

[0024] In this invention, the controller includes a control unit for acquiring cylinder pressure and piston displacement data in real time and calculating adjustment pressure data based on the data.

[0025] In this invention, pneumatic control is used to generate conical sealing force, ball bearings are used to transmit the conical sealing force to prevent the lateral force of the cylinder from being transmitted to the sealing surface, a proportional valve pressure regulator is used to control the cylinder pressure, a control unit is used to collect cylinder pressure and piston displacement data in real time and calculate and control the proportional valve pressure regulator to adjust the pressure; the control unit outputs the working status in real time and can provide real-time warnings to prevent abnormal displacement and pressure.

[0026] Specifically, the pressure calculation formula for the control unit is: Pset=(F0–F1) / (A•10); where: F0: User-defined target conical sealing force (N); F1: Initial preload of the wave spring (N), measured and written by a spring force measuring machine; A: Effective area of ​​the cylinder (mm²), calculated based on the cylinder diameter; k: Measured stiffness of the wave spring (N / mm), written by the supplier's report; ΔLw: Cumulative wear (mm), from the displacement sensor; Pset: Required cylinder setting pressure (MPa).

[0027] Within this invention, the following parameters are set: pressure sensor: range 0–1 MPa, accuracy ±0.2 % FS; displacement sensor: range ±0.63 mm, linearity 0.1%, resolution < 0.5 µm; target cone sealing force: 200N; cylinder effective area: 615.75mm²; initial preload of wave spring: 50N; wave spring stiffness: 50N / mm, cumulative wear (assumed): 0.1mm; then the factory pressure: Pset=(F0–F1′) / (A•10⁻³) =(200-50) / (615.75)=0.243066MPa.

[0028] Within this invention, the steps for preload compensation control are as follows: Step 1: The control unit reads data from the pressure sensor and displacement sensor. If the displacement does not change but the pressure drops, the control unit directly controls the proportional valve pressure regulator to complete the pressure regulation. Step 2: If the rotor wears down, the control unit receives a pressure reading of 0.24 MPa, and the displacement sensor receives a displacement reading of 0.1 mm, then the new air pressure should be: F1 = 50 - 50 × 0.1 = 45 N; Pset=(F0–F1′) / (A·10⁻³) = (200-45) / (615.75)=0.24306MPa=0.251725MPa; Step 3: The control unit sends a command to the proportional valve pressure regulator to adjust the pressure to 0.251725MPa, ensuring that the cone sealing force remains at 200N; Step 4: The control unit repeats this process every 50ms without moving, reads the data, calculates the target pressure, and sets the target pressure.

[0029] In this invention, a wave spring 26 and a boss are provided inside the pre-tightening body 2. The wave spring and the boss are used for limiting to ensure that there is a basic conical sealing force when the air pressure is zero.

[0030] In this invention, the pre-tightening body 2 is provided with limiting copper sleeves 27 located on both sides of the ball 23.

[0031] In this invention, a quick-connect fitting 28 is connected to the pretensioner 2. Furthermore, the proportional valve pressure regulator is connected to the pretensioner 2 via an air pipe, which is connected inside the quick-connect fitting 28.

[0032] In this invention, an O-ring is provided on the pre-tightening body 2.

[0033] This invention provides an embodiment of its application in the field of gas chromatography, specifically: a two-position rotary valve for a gas chromatograph (0-180℃, corrosive gas, P≥0.6 MPa); valve body material: Ni60; rotor material: PEEK and PTFE composite material; cylinder Ø28 mm, effective area A=615.75mm²; target air tightness of the rotary valve is better than 5E-8 Pa•m³ / s, target cone surface sealing force is 300N; factory instrument gas pressure is 0.7 MPa; displacement sensor range ±0.63 mm; after 12 months of operation, cumulative wear is 0.15. mm, the control unit automatically controls the pressure to maintain the cone surface sealing force at 300N, the monitored pressure data fluctuation is within 2%, the measured valve leakage rate is always better than 5E-8Pa•m³ / s, meeting the technical requirements of the project, the cone surface wear is uniform and there is no uneven wear after disassembly inspection, and it was used for another 24 months, for a total of 36 months, with a total of 800,000 switching times. The measured valve leakage rate is still better than 5E-8Pa•m³ / s, far exceeding the existing one-year warranty requirement.

[0034] Advantages of this invention: 1. Even after wear, the rotor cone surface can still accurately maintain the cone surface sealing force; 2. The initial conical sealing force can be precisely set, avoiding premature wear caused by overpressure adjustment and greatly improving valve life; 3. Simple structure, no hydraulic oil required, suitable for high and low temperature, dusty, flammable and explosive environments; 4. It has real-time monitoring and remote alarm functions, enabling remote early warning and maintenance; 5. Seamless replacement with traditional preload devices without adding new valve body models; 6. Even after the rotor undergoes dimensional changes due to creep in a high-temperature environment, it can still accurately maintain the sealing force of the conical surface; 7. It achieves a similar smooth effect to hydraulic control, but at a lower cost and with less pollution.

[0035] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A preload compensation control device for a conical sealing rotary valve, which is connected to the conical sealing rotary valve, wherein the conical sealing rotary valve contains a valve body, a rotating valve core, and a valve cover, characterized in that, The device includes a pre-tightening body connected to the valve body, and a cylinder, piston, ball bearing, displacement sensor, pressure sensor, and controller disposed within the pre-tightening body. The ball bearing is disposed at the connection point between the pre-tightening body and the cylinder, and the piston is attached to the ball bearing. The controller is connected to a proportional valve pressure regulator, which is connected to the pre-tightening body. The displacement sensor is used to detect the displacement of the piston in real time and transmit the detected information to the controller. The pressure sensor is used to detect the gas pressure in the cylinder in real time and transmit the detected information to the controller. The controller calculates the required gas pressure to be replenished to the valve body based on the received information and controls the proportional valve pressure regulator to adjust the pressure of the valve body.

2. The preload compensation control device for a conical sealing rotary valve according to claim 1, characterized in that, The controller includes a control unit for real-time acquisition of cylinder pressure and piston displacement data and for calculating adjustment pressure data based on the data.

3. The preload compensation control device for a conical sealing rotary valve according to claim 1, characterized in that, The pretensioner body is equipped with a wave spring and a boss.

4. The preload compensation control device for a conical sealing rotary valve according to claim 1, characterized in that, The preload body is provided with limiting copper sleeves on both sides of the ball.

5. The preload compensation control device for a conical sealing rotary valve according to claim 1, characterized in that, The pre-tightening body is connected to a quick-connect fitting.

6. The preload compensation control device for a conical sealing rotary valve according to claim 1, characterized in that, An O-ring is provided on the pre-tightening body.

7. The preload compensation control device for a conical sealing rotary valve according to claim 5, characterized in that, The proportional valve pressure regulator is connected to the pre-tightening body via an air pipe, which is connected inside the quick-connect fitting.

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