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CN-224214747-U - Corrosive medium transportation pneumatic ball valve

CN224214747UCN 224214747 UCN224214747 UCN 224214747UCN-224214747-U

Abstract

The utility model discloses a pneumatic ball valve for transporting corrosive media, belongs to the technical field of transportation of corrosive media, and solves the problem that when corrosive media obstruct a pneumatic actuator in the pneumatic ball valve for driving the valve ball, the conventional pneumatic ball valve often adopts a hard pull mode to adjust the angle of the valve ball, so that the pneumatic ball valve is further damaged. The pneumatic actuator is coupled with a transmission fault detection circuit, and the output end of the transmission fault detection circuit is coupled with the input end of the buzzer. When the utility model works, the transmission fault detection circuit detects the current of the pneumatic actuator, the current is converted, filtered, amplified and denoised, the differentiator extracts the change rate to generate a differential signal, the double peak detection is converted into the holding voltage, the alarm is triggered when the voltage exceeds the threshold value, the alarm circuit outputs the signal and controls the buzzer to alarm, the torque time curve can be monitored in real time, and the fault is identified according to the current distortion.

Inventors

  • XIA YANLING
  • XIA HAIPENG
  • Ji Chunqin
  • XIA YI
  • MENG TAO
  • HE QIANWEN
  • ZONG XUXING
  • ZHANG HAO

Assignees

  • 智鹏阀门集团有限公司

Dates

Publication Date
20260508
Application Date
20250628

Claims (8)

  1. 1. The utility model provides a pneumatic ball valve for corrosive medium transportation, its characterized in that includes valve body (1), pneumatic actuator (2) of setting on valve body (1) and the buzzer of setting on valve body (1), pneumatic actuator (2) are coupled with transmission fault detection circuit, transmission fault detection circuit's output and buzzer's input coupling, transmission fault detection circuit real-time supervision pneumatic actuator (2) drive current and draw current change rate characteristic after keeping circuit accumulation voltage signal and control buzzer work when discernment the double-peak distortion wave form that leads to because of the corruption jamming.
  2. 2. The pneumatic ball valve for corrosive medium transportation according to claim 1, wherein the transmission fault detection circuit comprises a current detection circuit (3), a waveform shaping circuit (4), a differentiator circuit (5), a double-peak detection circuit (6), a threshold comparison circuit (7) and an alarm output circuit (8), wherein the output end of the current detection circuit (3) is connected with the input end of the waveform shaping circuit (4), the output end of the waveform shaping circuit (4) is connected with the input end of the differentiator circuit (5), the output end of the differentiator circuit (5) is connected with the input end of the double-peak detection circuit (6), the output end of the double-peak detection circuit (6) is connected with the in-phase input end of the threshold comparison circuit (7), the output end of the threshold comparison circuit (7) is connected with the control end of the alarm output circuit (8), and the execution end of the alarm output circuit (8) is connected with the buzzer.
  3. 3. The pneumatic ball valve for corrosive medium transportation according to claim 2, wherein the current detection circuit (3) comprises a current transformer, a first resistor and a first capacitor, a primary coil of the current transformer is connected in series in a positive power line of the pneumatic actuator (2), one end of a secondary coil of the current transformer is grounded, the other end of the secondary coil of the current transformer is connected with one end of the first resistor, the other end of the first resistor is connected with one end of the first capacitor and an input end of the waveform shaping circuit (4), and the other end of the first capacitor is grounded.
  4. 4. A corrosive medium transporting pneumatic ball valve according to claim 2, wherein said waveform shaping circuit (4) comprises a first operational amplifier, a second resistor, and a third resistor, said first operational amplifier having its non-inverting input connected to the output of the current detecting circuit (3), said first operational amplifier having its inverting input connected to ground through the second resistor, said first operational amplifier having its inverting input connected to its output through the third resistor, said first operational amplifier having its power supply electrically connected.
  5. 5. A corrosive medium transporting pneumatic ball valve according to claim 2, wherein said differentiator circuit (5) comprises a second operational amplifier, a second capacitor, a fourth resistor, a fifth resistor, and a first potentiometer, wherein the inverting input of said second operational amplifier is connected to the output of said waveform shaping circuit (4) through the second capacitor, the inverting input of said second operational amplifier is connected to the output of said second operational amplifier through the fourth resistor, the non-inverting input of said second operational amplifier is grounded through the fifth resistor, the first fixed terminal of said first potentiometer is electrically connected to the ground, the sliding terminal of said first potentiometer is connected to the end of said fourth resistor remote from the inverting input of said second operational amplifier.
  6. 6. The pneumatic ball valve for corrosive medium transportation according to claim 2, wherein the bimodal detection circuit (6) comprises a first diode, a third capacitor, a second diode and a sixth resistor, wherein the anode of the first diode is connected with the output end of the differentiator circuit (5), the cathode of the first diode is connected with the anode of the third capacitor, the cathode of the third capacitor is grounded, the sixth resistor is connected in parallel with two ends of the third capacitor, the anode of the second diode is connected with the anode of the third capacitor, and the cathode of the second diode is used as the output end of the bimodal detection circuit (6).
  7. 7. The pneumatic ball valve for corrosive medium transportation according to claim 2, wherein the threshold comparison circuit (7) comprises an LM393 voltage comparator, a second potentiometer, a seventh resistor, and an eighth resistor, wherein the non-inverting input terminal of the LM393 voltage comparator is connected to the output terminal of the bimodal detection circuit (6) through the seventh resistor, the inverting input terminal of the LM393 voltage comparator is connected to the sliding terminal of the second potentiometer, the first fixed terminal of the second potentiometer is electrically connected, the second fixed terminal of the second potentiometer is grounded, and the output terminal of the LM393 voltage comparator is connected to the power supply through the eighth resistor.
  8. 8. The pneumatic ball valve for corrosive medium transportation according to claim 2, wherein the alarm output circuit (8) comprises an NPN triode, a ninth resistor and a fourth capacitor, wherein a base electrode of the NPN triode is connected to an output end of the threshold comparison circuit (7) through the ninth resistor, an emitter electrode of the NPN triode is grounded, a collector electrode of the NPN triode is connected with an anode of a buzzer, a cathode of the buzzer is grounded, an anode of the fourth capacitor is connected with a collector electrode of the NPN triode, and a cathode of the fourth capacitor is grounded.

Description

Corrosive medium transportation pneumatic ball valve Technical Field The utility model relates to the technical field of corrosive medium transportation, in particular to a pneumatic ball valve for corrosive medium transportation. Background Pneumatic ball valves are needed for transporting corrosive media. The pneumatic ball valve consists of a ball body, a valve rod, a pneumatic actuator and the like, and when in transportation, the pneumatic actuator receives a signal to enable the ball body to rotate, and the flow direction and the flow rate of a medium are controlled. The sealing device has good sealing performance, can resist corrosion and quickly switch, can be remotely controlled, can effectively prevent medium leakage, ensures transportation safety, and is commonly used for corrosive medium pipeline conveying systems in the industries of chemical engineering, petroleum and the like. When the pneumatic ball valve is used for conveying corrosive media, the corrosive media can directly erode the valve rod and the transmission part, so that pitting or stress corrosion cracks are generated on the surface of the valve rod, corrosion products are accumulated in a movement gap to increase friction resistance, meanwhile, the media destroy sealing filler and then invade a bearing cavity, so that lubrication is invalid, key transmission parts such as gears and bearings are corroded, mechanical interference and torque transmission efficiency are suddenly reduced, and finally, the pneumatic actuator is caused to output torque insufficient to drive the valve ball, and the valve ball is characterized by valve action clamping stagnation, response delay and even complete locking. However, when corrosive media hinder the pneumatic actuator in the pneumatic ball valve from driving the valve ball, the conventional pneumatic ball valve often adopts a hard-pull mode to adjust the angle of the valve ball, so that further damage to the pneumatic ball valve can be caused. So a pneumatic ball valve for transporting corrosive medium is provided to solve or alleviate the problems. Disclosure of utility model The utility model aims to solve the defects in the prior art, and provides a pneumatic ball valve for transporting corrosive media. In order to achieve the above purpose, the present utility model adopts the following technical scheme: the utility model provides a pneumatic ball valve for corrosive medium transportation, includes the valve body, sets up the pneumatic actuator on the valve body and set up the buzzer on the valve body, pneumatic actuator is coupled and is had transmission fault detection circuit, transmission fault detection circuit's output and buzzer's input coupling, transmission fault detection circuit monitors pneumatic actuator's drive current in real time and draws current change rate characteristic after, keeps circuit accumulation voltage signal and control buzzer work when discernment because of corrosion clamping stagnation leads to the double-peak distortion wave form. Preferably, the transmission fault detection circuit comprises a current detection circuit, a waveform shaping circuit, a differentiator circuit, a double-peak detection circuit, a threshold comparison circuit and an alarm output circuit, wherein the output end of the current detection circuit is connected with the input end of the waveform shaping circuit, the output end of the waveform shaping circuit is connected with the input end of the differentiator circuit, the output end of the differentiator circuit is connected with the input end of the double-peak detection circuit, the output end of the double-peak detection circuit is connected with the in-phase input end of the threshold comparison circuit, the output end of the threshold comparison circuit is connected with the control end of the alarm output circuit, and the execution end of the alarm output circuit is connected with the buzzer. Preferably, the current detection circuit comprises a current transformer, a first resistor and a first capacitor, wherein a primary coil of the current transformer is connected in series in a power positive line of the pneumatic actuator, one end of a secondary coil of the current transformer is grounded, the other end of the secondary coil of the current transformer is connected with one end of the first resistor, the other end of the first resistor is connected with one end of the first capacitor and the input end of the waveform shaping circuit, and the other end of the first capacitor is grounded. Preferably, the waveform shaping circuit comprises a first operational amplifier, a second resistor and a third resistor, wherein the non-inverting input end of the first operational amplifier is connected with the output end of the current detection circuit, the inverting input end of the first operational amplifier is grounded through the second resistor, the inverting input end of the first operational amplifier is connected with the outp