CN219533661U

CN219533661U - ESD emergency shutdown control circuit

Info

Publication number: CN219533661U
Application number: CN202320381228.4U
Authority: CN
Inventors: 杨慎军; 尚飞跃; 郑启超; 杨露; 沐杨杨; 董珊珊; 黄桂锋; 朱鑫垚
Original assignee: China Petroleum and Chemical Corp; Xian Aerospace Propulsion Institute
Current assignee: China Petroleum and Chemical Corp; Xian Aerospace Propulsion Institute
Priority date: 2023-03-03
Filing date: 2023-03-03
Publication date: 2023-08-15
Anticipated expiration: 2033-03-03

Abstract

The embodiment of the utility model provides an ESD emergency shutdown control circuit, which comprises an ESD emergency shutdown valve, wherein the ESD emergency shutdown valve is powered by a central control system, a detection unit, a control unit and a normally closed valve are arranged between the ESD emergency shutdown valve and the central control system, and the detection unit, the control unit and the normally closed valve are connected in series. The ESD emergency shutdown control circuit provided by the utility model can timely and accurately sense and control the power on and off of the ESD, and a normally closed valve is reserved for manual control on site, so that the accuracy of remote control and automatic control is ensured, the remote control can be realized in the whole process through an automatic reset structure, the control efficiency is ensured, and convenience is provided for site overhaul and the like.

Description

ESD emergency shutdown control circuit

Technical Field

The utility model relates to the technical field of electrohydraulic actuators, in particular to an ESD emergency shutdown control circuit.

Background

The electrohydraulic actuator comprises a control module and a hydraulic power module, and is divided into a straight stroke and an angular stroke. The control module sends out instructions to the intelligent controllable motor or the servo valve, controls the hydraulic power module to output force (or moment) in a linear displacement (or angular displacement) mode, drives a controlled object, and completes the adjustment process through displacement feedback to realize various functional control.

The electrohydraulic actuator is often used for safety control in a plurality of flammable and explosive fields such as petroleum refining, coal chemical industry, natural gas storage and use and the like due to the characteristics of large stroke, large thrust or moment, high intelligent degree, quick response time, high sensitivity, compact mechanism, fire prevention and the like. However, the electrohydraulic actuator sometimes cannot realize field control, such as gas leakage or difficult closing of a valve when a fire disaster occurs, so that loss is enlarged, an emergency shutdown effect is not achieved, if remote control is adopted, communication interruption and power interruption control are difficult to carry out after large explosion occurs, and in addition, even if no accident occurs, power failure detection may be needed, and field on-site control is needed.

An ESD emergency shutdown valve control circuit of the prior art 202111327198.0 also improves upon the ESD emergency shutdown valve control. The control circuit is considered to have single control power supply and more intermediate links of the control circuit, the situation of remote misoperation of a remote personnel DCS can possibly occur, the ESD valve only has one relay which is turned on or off in a remote control instruction of the DCS system, and when the DCS system and a control system of the voltage regulating station are far away, if the control instruction is lost due to disconnection of a control cable or failure of the relay or other reasons, the control operation failure of the electromagnetic valve can cause the misoperation of the ESD valve and the interruption of air supply, so that the potential safety hazard of tripping of an operation unit is caused. The prior art just builds two-way control to realize mutual complementation, but the problem of control failure can be caused, and the short-distance detection control of personnel is inconvenient.

Disclosure of Invention

The embodiment of the utility model provides an ESD emergency shutdown control circuit which feeds back to a control module through the power-off detection of an ESD emergency shutdown valve, and then the control module is used for controlling whether the power is turned on or off, and when the maintenance is needed, a normally closed valve is opened, so that the ESD emergency shutdown is successful.

The embodiment of the utility model provides an ESD emergency shutdown control circuit, which comprises an ESD emergency shutdown valve, wherein the ESD emergency shutdown valve is powered by a central control system, a detection unit, a control unit and a normally closed valve are arranged between the ESD emergency shutdown valve and the central control system, and the detection unit, the control unit and the normally closed valve are connected in series.

Preferably, the detection unit is arranged in parallel with the ESD emergency cut-off valve, the ESD emergency cut-off valve is an ESD electromagnetic valve, the detection unit comprises a second electromagnet and a one-position double-control switch, the second electromagnet is arranged close to the ESD emergency cut-off valve, and the one-position double-control switch is electrically connected with the PLC control module.

Specifically, the second electromagnet is a magnetic element shared by the detection unit and the ESD electromagnetic valve.

Specifically, the normally closed valve adopts a normally closed electromagnetic valve.

Specifically, the central control system provides 24V power.

Specifically, the control unit comprises a first electromagnet and a one-position double-control switch.

Specifically, the first electromagnet is controlled by the PLC control module, and the one-position double-control switch is connected between the ESD emergency cut-off valve and the central control system.

Specifically, the detection unit and the control unit are electrically connected with the PLC control module.

The ESD emergency shutdown control circuit provided by the utility model has the following advantages:

the ESD emergency shutdown control circuit provided by the utility model can timely and accurately sense and control the power on and off of the ESD, and a normally closed valve is reserved for manual control on site, so that the accuracy of remote control is ensured, the remote control can be realized in the whole process through an automatic reset structure, the control efficiency is ensured, and convenience is provided for site overhaul and the like.

Drawings

In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic diagram of an ESD emergency shutdown control circuit according to an embodiment of the present utility model;

fig. 2 is a schematic block diagram of ESD emergency shutdown control according to an embodiment of the present utility model;

fig. 3 is a schematic diagram of an ESD emergency shutdown control PLC according to an embodiment of the present utility model.

In FIGS. 1-3, 11-switch site one, 12-switch site two, 14-switch site three, K5-first electromagnet, K6-second electromagnet, ST-normally closed valve, GC2: eighth pin of 8-PLC second module, GC4: and a fifth pin of the fourth module of the 5-PLC.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

Referring to fig. 1-3, an ESD emergency shutdown control circuit provided by an embodiment of the present utility model sequentially forms a series circuit of an ESD emergency shutdown valve, a control unit, and a normally closed valve to connect with a central control system.

The detection unit and the ESD emergency cut-off valve are arranged in parallel, the ESD emergency cut-off valve is an ESD electromagnetic valve, a second electromagnet K6 is arranged in the ESD electromagnetic valve, a magnetic control one-position double-control switch is arranged near the second electromagnet K6 and is electrically connected with the PLC control module, and the on-off of the ESD electromagnetic valve can be judged through the on-off position of the magnetic control one-position double-control switch.

The normally closed valve ST of the present embodiment adopts a normally closed electromagnetic valve, and the central control system supplies power 24V.

The control unit of this embodiment includes first electro-magnet K5 and magnetic control one-bit double control switch, and first electro-magnet K5 is controlled by PLC control module, and magnetic control one-bit double control switch inserts between ESD emergency cut-off valve and the well accuse system.

In the use process, a 24V power supply is provided for a circuit where the ESD electromagnetic valve is located through the central control system, a normally closed valve, a detection unit and a control unit are connected into the circuit, the position of the ESD electromagnetic valve is obtained through the detection unit, a basis is provided for remote control and automatic control, and a terminal of the remote control and the automatic control sends a control signal to a first electromagnet of the control unit according to a signal fed back by the detection unit and on-off to be realized, which are obtained by a PLC control module, so that the control unit is controlled to open or close a switch.

When wiring, the first switch site 11 and the second switch site 12 on the magnetic control one-position double-control switch are connected into a circuit, and the third switch site 13 on the magnetic control one-position double-control switch is virtually connected to form a collection end for obtaining disconnection information later. The PLC control module adopted in the embodiment is GCAN-PLC-400, and the detection unit and the connection point GC2 thereof are as follows: the eighth pin of the 8-PLC second module is connected with the control module by GC4: fifth pin of fourth module of 5-PLC

It will be apparent to those skilled in the art that various modifications and variations can be made to the present utility model without departing from the spirit or scope of the utility model. Thus, it is intended that the present utility model also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.

Claims

1. The ESD emergency shutdown control circuit comprises an ESD emergency shutdown valve, and is characterized in that the ESD emergency shutdown valve is powered by a central control system, a detection unit, a control unit and a normally closed valve are arranged between the ESD emergency shutdown valve and the central control system, and the detection unit, the control unit and the normally closed valve are connected in series.

2. The ESD emergency shutdown control circuit of claim 1, wherein the detection unit is arranged in parallel with an ESD emergency shutdown valve, the ESD emergency shutdown valve is an ESD solenoid valve, the detection unit comprises a second electromagnet and a one-position double-control switch, the second electromagnet is arranged close to the ESD emergency shutdown valve, and the one-position double-control switch is electrically connected with the PLC control module.

3. The ESD emergency shutdown control circuit of claim 2, wherein the second electromagnet is a magnetic element shared by the detection unit and the ESD solenoid.

4. The ESD emergency shutdown control circuit of claim 1, wherein the normally closed valve is a normally closed solenoid valve.

5. The ESD emergency shutdown control circuit of claim 1, wherein the central control system provides 24V power.

6. The ESD emergency shutdown control circuit of claim 1, wherein the control unit comprises a first electromagnet and a one-bit double-control switch.

7. The ESD emergency shutdown control circuit of claim 6, wherein the first electromagnet is controlled by a PLC control module and the one-position double-control switch is connected between the ESD emergency shutdown valve and the central control system.

8. The ESD emergency shutdown control circuit of claim 1, wherein the detection unit and the control unit are both electrically connected to the PLC control module.