Anti-blocking intelligent valve positioner and intelligent valve

Abstract

The invention discloses an anti-blocking intelligent valve positioner and an intelligent valve. The anti-blocking intelligent valve positioner comprises an air source purifying unit which is used for being connected with an air source; an anti-blocking electrical conversion unit which is connected with the air source purifying unit and used for controlling a valve actuator; a circuit control unit which is connected with the anti-blocking electrical conversion unit and used for transmitting a control signal to the anti-blocking electrical conversion unit; and a position feedback unit which is connected with the circuit control unit and used for detecting the actuation position of the valve actuator. The intelligent valve comprises the anti-blocking intelligent valve positioner and the valve actuator which is matched with the anti-blocking intelligent valve positioner. Intelligent valve positioning is realized, and internal blocking caused by pollution of the air source can be effectively avoided so that the anti-blocking intelligent valve positioner and the intelligent valve are particularly suitable for industrial field environment process control.

Description

technical field [0001] The invention relates to the field of valve positioners, in particular to an anti-clogging intelligent valve positioner and an intelligent valve. Background technique [0002] The valve positioner is the main accessory of the control valve. It uses the valve stem displacement signal as the input feedback measurement signal and the controller output signal as the setting signal for comparison. When there is a deviation between the two, it changes its output to the actuator. The signal makes the actuator act, and establishes a one-to-one correspondence between the displacement of the valve stem and the output signal of the controller. Therefore, the valve positioner forms a feedback control system with the valve stem displacement as the measurement signal and the controller output as the setting signal. The manipulated variable of the control system is the output signal of the valve positioner to the actuator. [0003] Valve positioners that work with ...

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Problems solved by technology

[0004] However, due to the use of high-precision electrical conversion components, this type of positioner has a long internal air path and a small hole diameter, which has high requirements on the quality of the air source.

With the increase of smoke and dust generated by heating and combustion in the industrial process, the increase of automobile exhaust emissions and other reasons, the content of particulate matter in the air continues to rise, resulting in the current pneumatic intelligent valve positioner after a period of use. Piezoelectric The phenomenon that the valve inlet or outlet is blocked and the operation is abnormal

[0005] The Chinese invention patent application with publication number CN101650555A (application number 200910101852.9) discloses an intelligent electric valve positioner, which includes a control unit, an I / P conversion unit, a valve position detection feedback unit, and a power supply unit. The power supply unit includes A current sampling circuit and a voltage stabilizing circuit receiving valve control signals, the output end of the voltage stabilizing circuit is connected to a low-dropout linear voltage regulator, which is used to drive the control unit, the I / P conversion unit, and the valve position detection feedback unit to work; the described The current sampling circuit of the current sampling circuit is composed of a resistor connected to the negative terminal of the valve control signal and the ground terminal of the voltage stabilizing circuit, and an amplifier connected to the resistor. However, the smart positioner uses an I / P conversion unit, which does not take into account the adverse effects caused by air source pollution

[0006] The Chinese invention patent application with authorized notification number CN103216664A (application number 201310143943.5) discloses a smart valve positioner, which includes a piezoelectric module. The piezoelectric module includes an air inlet chamber with an air inlet and an air outlet and is used for sealing or Open the sealing ball of the air inlet of the air inlet chamber. The air inlet is a tapered hole whose section diameter gradually increases along the air inlet direction. The sealing ball is supported by a return spring and can move along the axis of the air inlet. Located in the air inlet, the diameter of the sealing ball is greater than or equal to the minimum cross-sectional diameter of the air inlet and smaller than the largest cross-sectional diameter of the air inlet. The sealing ball is made of aluminum alloy material, which has better oil resistance, water resistance and water resistance. Expansion performance, so the service life is longer, and the piezoelectric module will not be damaged due to the problem of oil and water, but there is no good solution to the air source pollution

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