阅读说明：本技术 一种开关型阀门状态检测及判别控制方法 (Switch type valve state detection and discrimination control method ) 是由 汪引红 柳雷 于 2020-07-29 设计创作，主要内容包括：本发明公开了一种开关型阀门状态检测及判别控制方法。将开关型阀门的开和关2个阀门位置信号合并为1个DI检测信号,或将开关型阀门的开和关2个阀门位置信号和阀门开关过程中的过力矩故障信号合并为1个DI检测信号,通过电子设备部件将该DI检测信号和控制驱动阀门开关的DO驱动信号进行逻辑运算,由电子设备部件来判别阀门的开、关和非正常(故障)状态,同时对阀门进行开和关的操作,所述DI信号通过接线端子进入电子设备部件,所述电子设备部件包括判别阀门的开、关和正常/故障状态及对阀门进行开和关的操作各逻辑单元。本发明减少使用电子设备部件的DI检测点,实现电子设备部件规模的降低,减少电子设备部件和现场设备的连接电缆芯数,以达到降低成本节约费用的目的。(The invention discloses a method for detecting and judging and controlling the state of a switch type valve. The method comprises the steps of combining 2 opening and closing valve position signals of a switch type valve into 1 DI detection signal, or combining 2 opening and closing valve position signals of the switch type valve and an over-moment fault signal in the valve opening and closing process into 1 DI detection signal, carrying out logic operation on the DI detection signal and a DO driving signal for controlling and driving the valve opening and closing through an electronic equipment component, judging the opening, closing and abnormal (fault) states of the valve through the electronic equipment component, and simultaneously carrying out opening and closing operation on the valve, wherein the DI signal enters the electronic equipment component through a connecting terminal, and the electronic equipment component comprises logic units for judging the opening, closing and normal/fault states of the valve and carrying out opening and closing operation on the valve. The invention reduces DI detection points of electronic equipment components, realizes the reduction of the scale of the electronic equipment components, and reduces the number of connecting cable cores of the electronic equipment components and field equipment, thereby achieving the purposes of reducing cost and saving expense.)

1. A method for detecting and discriminating the state of switch-type valve features that 2 signals of the position of switch-type valve are combined to obtain 1 DI detection signal, or 2 signals of the position of switch-type valve and 1 DI detection signal are combined to obtain 1 DI detection signal, which is logically operated by electronic device to determine the open, close and abnormal (failure) states of valve and to operate the valve.

2. The method as claimed in claim 1, wherein the means for opening and closing the on-off valve is a pneumatically or electrically driven on-off valve actuator.

3. The method as claimed in claim 1, wherein the electronic device is a PLC/DCS device or a valve control device with logic operation capability dedicated to control of the on-off valve.

4. The method according to claim 2 or 3, wherein in the driving mechanism, the SVO and the SVC are actuators for driving the valve to open and close respectively, and when the valve needs to be opened or closed, the electronic device outputs a DO signal for opening the DO-SVO or closing the DO-SVC to drive the valve to open or close; the LSO and the LSC are position switches of a valve opening position and a valve closing position respectively; when the valve is in an open state, the position switch LSO is switched on, and the valve driving mechanism outputs a valve open state signal for the electronic equipment part; when the valve is in the closed state, the position switch LSC is switched on, and the valve driving mechanism outputs a valve closed state signal for the electronic equipment component.

5. The method of claim 4, wherein 2 opening and closing signals of the on-off valve are combined to form 1 DI detection signal, and the method comprises connecting the valve opening/closing state signals LSO and LSC outputted from the valve driving mechanism in parallel, combining and outputting the opening/closing state signal DI-LSOC of the valve for the electronic device component, and using the DI-LSOC as the DI signal to enter the electronic device component as the input DI signal for the electronic device component to determine the valve state.

6. The method of claim 4, wherein the open-over-torque signal STO and the close-over-torque signal STC of the switch-type valve are added to the signal loop of the valve position of the open LSO and the close LSC of the switch-type valve; the opening over-torque signal STO and the closing over-torque signal STC of the switch type valve and the valve position signals of the opening LSO and the closing LSC of the switch type valve are combined together into 1 DI detection signal DI-LSOC, and the DI-LSOC is connected with the electronic equipment part through a wire and cable to be used as a DI signal to enter the electronic equipment part for the electronic equipment part to judge the input DI signal of the valve state.

Technical Field

The invention relates to a method for merging, detecting, controlling and distinguishing the opening, closing and fault state information of a valve in the opening and closing operation process of a switch type valve.

Background

As is known at present, when an electronic device component or a PLC/DCS device controls an on-off valve, 2 DI channels configured by the electronic device component or the PLC/DCS device detect 2 position switching signals of a gate position of the on-off valve to obtain on-off state information of the on-off valve; when the valve needs to perform over-moment fault detection, 1 or 2 DI channels are required to be added to complete over-moment fault monitoring of the switch type valve; the opening and closing operations of the on-off type valve are performed by 2 DO channels configured by the electronic device parts or the PLC/DCS device.

Thus, the electronic device components or PLC/DCS devices need to be configured with multiple DI channels and 2 DO channels to complete the monitoring of the on-off type valve.

The conventional method has the characteristic that a plurality of DI channels (2 (or 3) and the like) are required to complete the state information detection of the switch type valve. Therefore, firstly, more electronic equipment parts or DI channels of PLC/DCS equipment need to be occupied, the scale of the electronic equipment parts or the PLC/DCS equipment is larger, and the cost is higher; and secondly, the number of cable cores of the switch-type valve and the electronic equipment component or the control interface of the PLC/DCS equipment on the site is large, and the cable cost and the site construction cost are high.

Disclosure of Invention

The invention provides a method for detecting and judging and controlling the state of a switch type valve, which aims to solve the problems in the prior art, reduce the scale of electronic equipment parts or PLC/DCS equipment, reduce the cost of control equipment and reduce the cost of control interface cables and engineering construction cost.

The solution of the invention is based on the principle that a valve position switch is always in a connected state, namely the valve is in a closed state instead of an open state, no matter whether the valve is in the open position or the closed position.

The technical solution of the invention is as follows: a method for detecting and discriminating the state of switch-type valve includes such steps as combining 2 signals of opening and closing valve position of switch-type valve to obtain 1 DI detection signal, or combining the signal of over-torque (STO) and over-torque (STC) of switch-type valve and the signals of LSO and LSC of switch-type valve to obtain 1 DI detection signal, and performing logic operation on the DI detection signal and the drive signal of DO for driving the valve to open or close by electronic device.

According to an embodiment of the invention, the drive mechanism for opening and closing the on-off valve is a pneumatically or electrically driven on-off valve actuator.

According to the embodiment of the invention, the electronic equipment component is a PLC/DCS device or a valve control device which is specially used for open-close type valve control and has logic operation capability.

According to the embodiment of the invention, in the driving mechanism, SVO and SVC are actuating elements for driving the valve to open and close respectively, when the valve needs to be opened or closed, the electronic equipment part outputs a DO signal for opening the DO-SVO or closing the DO-SVC to drive the valve to open or close; the LSO and the LSC are position switches of a valve opening position and a valve closing position respectively; when the valve is in an open state, the position switch LSO is switched on, and the valve driving mechanism outputs a valve open state signal for the electronic equipment part; when the valve is in the closed state, the position switch LSC is switched on, and the valve driving mechanism outputs a valve closed state signal for the electronic equipment component.

According to the embodiment of the invention, the valve position signal loops of the opening LSO and the closing LSC of the switch type valve are added with the opening over-torque signal STO and the closing over-torque signal STC of the switch type valve; the opening over-torque signal STO and the closing over-torque signal STC of the switch type valve and the valve position signals of the opening LSO and the closing LSC of the switch type valve are combined together into 1 DI detection signal DI-LSOC, and the DI-LSOC is connected with the electronic equipment part through a wire and cable to be used as a DI signal to enter the electronic equipment part for the electronic equipment part to judge the input DI signal of the valve state.

According to the embodiment of the invention, the connecting terminal DC-COM is a power supply terminal for providing power for collecting a valve driving signal and a valve state signal; the DO-SVO and DO-SVC terminals are DO signals output by the electronic device components, and the DO-SVO and DO-SVC are used for driving the opening and closing operations of the valves.

According to the embodiment of the invention, an opening over-torque signal STO and an closing over-torque signal STC are added to 2 opening and closing valve position signals of the switch type valve, an electronic equipment component judges the state of the valve, namely the switching state and the fault state, the opening and closing over-torque switches STO and STC of a valve actuating mechanism, a valve opening position switch LSO and a valve closing position switch LSC are connected in parallel, the signals are used as DI signals through a connecting terminal DI-LSOC and enter the electronic equipment component, and the electronic equipment component judges the person DI signals in the valve state.

The beneficial technical effects of the invention are as follows: the method can obviously reduce DI detection points of electronic equipment components or PLC/DCS equipment, realize the reduction of the scale of the electronic equipment components or the PLC/DCS equipment, reduce the core number of connecting cables of the low electronic equipment components or the PLC/DCS equipment and field equipment, simplify the wiring between the electronic equipment components or the PLC/DCS equipment and a field valve, and achieve the purposes of reducing cost and saving cost.