CN220306951U - Protection system of electric regulating valve - Google Patents
Protection system of electric regulating valve Download PDFInfo
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- CN220306951U CN220306951U CN202321827180.1U CN202321827180U CN220306951U CN 220306951 U CN220306951 U CN 220306951U CN 202321827180 U CN202321827180 U CN 202321827180U CN 220306951 U CN220306951 U CN 220306951U
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- 238000004519 manufacturing process Methods 0.000 abstract description 7
- 238000011065 in-situ storage Methods 0.000 description 6
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- 230000002159 abnormal effect Effects 0.000 description 1
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Abstract
The utility model discloses an electric control valve protection system, wherein an alternating current contactor KM is arranged on a power supply main loop of an electric control valve M, and a main contact inlet end of the alternating current contactor KM is connected with a phase failure and phase sequence protection relay XJ; the control loop of the alternating current contactor KM comprises an air-break QF3, a button switch SB1, a phase-failure and phase-sequence protection relay XJ, a direct current intermediate relay KA and a button switch SB2 which are sequentially connected in series, wherein the button switch SB2 is connected with an on-site PLC system switching value output auxiliary contact, and the direct current intermediate relay KA is connected to an on-site PLC system power supply inlet end. When the on-site PLC system power supply inlet wire end is in a sudden stop state and phase interruption occurs, the phase interruption and phase sequence protection relay XJ cuts off a self-locking control loop of an alternating current contactor KM coil, and the alternating current contactor KM cuts off the inlet wire power supply of an electric control valve M, so that the electric control valve M keeps the original opening value and does not work any more; the damage and misoperation of the electric regulating valve are effectively prevented, and the safety production is ensured.
Description
Technical Field
The utility model relates to the technical field of electric automation control, in particular to an electric control valve protection system.
Background
The electric regulating valve has the characteristics of small volume, light weight, simple connection, large flow, high regulating precision and the like, and is widely applied to an industrial process automatic control system in the industries of electric power, petroleum, chemical industry, metallurgy, environmental protection, light industry, teaching and scientific research equipment and the like. The electric regulating valve mostly adopts the control circuit shown in fig. 1, the electric regulating valve M of the open-close QF2 is powered on, the output of the switch power supply DV24V of the open-close QF1 is powered on by an on-site PLC system, the pressure quantity is fed back to the on-site PLC system through the front pressure transmitter PT1 and the rear pressure transmitter PT2 of the electric regulating valve M, the on-site PLC system is communicated to a remote DCS control center upper computer, and the DCS control center upper computer feeds back data and actual requirements through the pressure transmitter PT1 and the pressure transmitter PT2, so that the opening value of the electric regulating valve M is given, the electric regulating valve M is automatically regulated, and the requirements of the pressure and the flow of a production pipe network are met.
In the working engineering of the electric control valve M, when the DC24V of the power inlet end of the on-site PLC system is in flash stop and phase failure is abnormal, the on-site PLC system is in flash stop and power failure, the analog output in the restarting process of the on-site PLC system is 0mA, and at the moment, the input analog received by the electric control valve M is 0mA, so that the electric control valve M is automatically closed; when the local PLC system is restarted normally after power is on, the analog quantity is output as an opening value given by the remote DCS control center upper computer, at the moment, the input analog quantity received by the electric regulating valve M is automatically regulated as the opening value given by the remote DCS control center upper computer, and the electric regulating valve M is automatically regulated and opened to the opening value given by the remote DCS control center upper computer. The electric regulating valve M is suddenly closed and opened, so that devices are damaged, misoperation is caused or normal work cannot be performed, particularly when the power supply of the suburb on-site PLC system and the electric regulating valve M is taken from the power supply managed by municipal or other people, the power supply is subjected to sudden stop, phase interruption, phase failure and phase sequence change, and great potential safety hazards and losses are easily caused for production.
Disclosure of Invention
The utility model aims to provide an electric control valve protection system which is used for preventing the electric control valve from being automatically closed, opened or misoperation when a local PLC system is in a sudden stop, power-off or restarting state, so that the electric control valve is damaged, and the problem of potential production safety hazard is solved.
In order to solve the problems, the utility model adopts the following technical scheme:
the protection system of the electric regulating valve comprises an idle QF1 connected with a DC24V of a switching power supply, an idle QF2 connected with an incoming line end of the electric regulating valve M and an in-situ PLC system, wherein the in-situ PLC system is connected with a remote DCS control center upper computer, a power incoming line end of the in-situ PLC system is connected with the DC24V of the switching power supply, the idle QF2 is installed on a power main loop of the electric regulating valve M, an outgoing line end of the idle QF2 is connected with a main contact of an alternating current contactor KM, an outgoing line end of the main contact of the alternating current contactor KM is connected with an incoming line end of the electric regulating valve M, and the incoming line end of the main contact of the alternating current contactor KM is connected with a phase failure and phase sequence protection relay XJ; the control loop of the alternating current contactor KM comprises an air-break QF3, a push button switch SB1, a phase-failure and phase-sequence protection relay XJ, a direct current intermediate relay KA and a push button switch SB2 which are sequentially connected in series, wherein a normally open contact of the push button switch SB2 is connected with an A2 end of a coil of the alternating current contactor KM in series, an auxiliary normally open contact of the alternating current contactor KM and an on-site PLC system switching value output auxiliary contact in series, an A1 end of the coil of the alternating current contactor KM is connected with a neutral line N, the air-break QF3 is connected with an alternating current power supply L11 phase, and the direct current intermediate relay KA is connected with an on-site PLC system power supply inlet end; when the power inlet end of the local PLC system is normally powered, the coil of the direct-current intermediate relay KA and the phase-failure and phase-sequence protection relay XJ work normally, the auxiliary normally-open contacts of the direct-current intermediate relay KA and the phase-failure and phase-sequence protection relay XJ are closed, and the auxiliary normally-closed contacts are opened; when the on-site PLC system power supply inlet wire end is in a sudden stop and phase failure, the on-site PLC system is in a sudden stop and power failure, the direct current intermediate relay KA coil and the phase failure and phase sequence protection relay XJ are in a sudden stop and power failure, the auxiliary normally open contacts of the direct current intermediate relay KA and the phase failure and phase sequence protection relay XJ are all disconnected, the phase failure and phase sequence protection relay XJ is disconnected with a self-locking control loop of an alternating current contactor KM coil, and the alternating current contactor KM is disconnected with an inlet wire power supply of an electric control valve M, so that the electric control valve M keeps an original opening value and does not work; after the power is turned on, the on-site PLC system is restarted, the direct-current intermediate relay KA coil and the phase-failure and phase-sequence protection relay XJ are powered on, the auxiliary normally-open contacts of the direct-current intermediate relay KA and the phase-failure and phase-sequence protection relay XJ are closed, the auxiliary normally-closed contacts are opened, the electric regulating valve M has working conditions, and the electric regulating valve can work normally by pressing the torsion switch SB2 or the on-site PLC system opening point.
Preferably, a safety FU3 is further connected in series between the hollow switch QF3 and the push button switch SB1 in the control circuit of the ac contactor KM.
Preferably, the power indicator lamp HW of the electric regulating valve M is connected in parallel with the ends A1 and A2 of the coil A1 of the ac contactor KM.
In the utility model, an alternating current contactor KM is connected to a power supply main loop of an electric regulating valve M, a control loop of the alternating current contactor KM is provided with a phase interruption and phase sequence protection relay XJ and a direct current intermediate relay KA which are connected in series, an auxiliary normally open contact of the alternating current contactor KM is connected with an on-site PLC system switching value output auxiliary contact, and an on-site PLC system collects feedback signals of the direct current intermediate relay KA, the phase interruption and phase sequence protection relay XJ and the alternating current contactor KM and transmits the feedback signals to a remote DCS control system upper computer. When the on-site PLC system power supply inlet wire end is in a sudden stop state and phase interruption occurs, the phase interruption and phase sequence protection relay XJ cuts off a self-locking control loop of an alternating current contactor KM coil, and the alternating current contactor KM cuts off the inlet wire power supply of an electric control valve M, so that the electric control valve M keeps the original opening value and does not work any more; after the power is turned on, the on-site PLC system is restarted, the direct-current intermediate relay KA coil and the phase-failure and phase-sequence protection relay XJ are powered on, and the electric regulating valve M works normally. When the local PLC is powered off, restarted or downloaded in a program cold start mode and the electric control valve M needs to be powered off, an operator operates the button switch SB1 on site, the alternating current contactor KM can be disconnected in advance, and misoperation of the electric control valve M is prevented. In the process, the opening value of the electric regulating valve M is kept unchanged, misoperation can not occur, damage to components of the electric regulating valve can not be caused, safe production is guaranteed, and production efficiency is improved.
Drawings
FIG. 1 is a schematic circuit diagram of a prior art electrically operated regulator valve;
FIG. 2 is a schematic circuit diagram of the present utility model
Detailed Description
The utility model is described in further detail below with reference to the accompanying drawings.
The protection system of the electric regulating valve shown in fig. 2 comprises an idle QF1 connected with a DC24V of a switching power supply, an idle QF2 connected with an inlet wire end of the electric regulating valve M and an in-situ PLC system, wherein the in-situ PLC system is connected with a remote DCS control center upper computer, a power inlet wire end of the in-situ PLC system is connected with the DC24V of the switching power supply, the idle QF2 is installed on a power main loop of the electric regulating valve M, an outlet wire end of the idle QF2 is connected with a main contact of an alternating current contactor KM, an outlet wire end of the main contact of the alternating current contactor KM is connected with an inlet wire end of the electric regulating valve M, and an inlet wire end of the main contact of the alternating current contactor KM is connected with a phase failure and phase sequence protection relay XJ; the control loop of the alternating current contactor KM comprises an air-break QF3, a safety FU3, a button switch SB1, a phase-failure and phase-sequence protection relay XJ, a direct current intermediate relay KA and a button switch SB2 which are sequentially connected in series, wherein a normally open contact of the button switch SB2 is connected with an A2 end of a coil of the alternating current contactor KM in series, an auxiliary normally open contact of the alternating current contactor KM and an on-site PLC system switching value output auxiliary contact in series, an A1 end of the coil of the alternating current contactor KM is connected with a neutral line N, the air-break QF3 is connected with an alternating current power supply L11 phase, and the direct current intermediate relay KA is connected with an on-site PLC system power supply inlet end; the power indicator lamp HW of the electric regulating valve M is connected in parallel with the A1 end and the A2 end of the coil A1 of the alternating current contactor KM.
The button switch SB1 realizes the on-site breaking of the alternating-current contactor KM, the button switch SB2 realizes the on-site closing of the alternating-current contactor KM and self-locking, the remote DCS control center upper computer controls the on-site PLC system to enable the alternating-current contactor KM to be closed and self-locking, the main loop of the alternating-current contactor KM is closed to switch on the power supply of the electric regulating valve M, and the indicator lamp HW is used for displaying whether the power supply of the electric regulating valve M is normal on site.
When the power inlet end of the local PLC system is normally powered, the coil of the direct-current intermediate relay KA and the phase-failure and phase-sequence protection relay XJ work normally, the auxiliary normally-open contacts of the direct-current intermediate relay KA and the phase-failure and phase-sequence protection relay XJ are closed, and the auxiliary normally-closed contacts are opened; when the on-site PLC system power supply inlet wire end is in a sudden stop and phase failure, the on-site PLC system is in a sudden stop and power failure, the direct current intermediate relay KA coil and the phase failure and phase sequence protection relay XJ are in a sudden stop and power failure, the auxiliary normally open contacts of the direct current intermediate relay KA and the phase failure and phase sequence protection relay XJ are all disconnected, the phase failure and phase sequence protection relay XJ is disconnected with a self-locking control loop of an alternating current contactor KM coil, and the alternating current contactor KM is disconnected with an inlet wire power supply of an electric control valve M, so that the electric control valve M keeps an original opening value and does not work; after the power is turned on, the on-site PLC system is restarted, the direct-current intermediate relay KA coil and the phase-failure and phase-sequence protection relay XJ are powered on, the auxiliary normally-open contacts of the direct-current intermediate relay KA and the phase-failure and phase-sequence protection relay XJ are closed, the auxiliary normally-closed contacts are opened, the electric regulating valve M has working conditions, and the electric regulating valve can work normally by pressing the torsion switch SB2 or the on-site PLC system opening point.
When the local PLC is powered off, restarted or downloaded in a program cold start mode and the electric control valve M needs to be powered off, an operator operates the button switch SB1 on site, the alternating current contactor KM can be disconnected in advance, and misoperation of the electric control valve M is prevented.
The above are only preferred examples of the present utility model. It should be noted that other equivalent modifications and improvements will occur to those skilled in the art, and are also to be considered as the scope of the present utility model, given the technical teaching provided by the present utility model.
Claims (3)
1. The utility model provides an electric control valve protection system, includes the sky QF1 that opens that is connected with switching power supply DC24V, the sky QF2 that opens that is connected with electric control valve M inlet wire end and local PLC system, and local PLC system is connected with long-range DCS control center host computer, and the power inlet wire end of local PLC system is connected with switching power supply DC24V, its characterized in that: the power supply main loop of the electric regulating valve M is provided with an idle QF2, the outlet end of the idle QF2 is connected with the main contact of an alternating current contactor KM, the outlet end of the main contact of the alternating current contactor KM is connected with the inlet end of the electric regulating valve M, and the inlet end of the main contact of the alternating current contactor KM is connected with a phase failure and phase sequence protection relay XJ; the control loop of the alternating current contactor KM comprises an air-break QF3, a push button switch SB1, a phase-failure and phase-sequence protection relay XJ, a direct current intermediate relay KA and a push button switch SB2 which are sequentially connected in series, wherein a normally open contact of the push button switch SB2 is connected with an A2 end of a coil of the alternating current contactor KM in series, an auxiliary normally open contact of the alternating current contactor KM and an on-site PLC system switching value output auxiliary contact in series, an A1 end of the coil of the alternating current contactor KM is connected with a neutral line N, the air-break QF3 is connected with an alternating current power supply L11 phase, and the direct current intermediate relay KA is connected with an on-site PLC system power supply inlet end; when the power inlet end of the local PLC system is normally powered, the coil of the direct-current intermediate relay KA and the phase-failure and phase-sequence protection relay XJ work normally, the auxiliary normally-open contacts of the direct-current intermediate relay KA and the phase-failure and phase-sequence protection relay XJ are closed, and the auxiliary normally-closed contacts are opened; when the on-site PLC system power supply inlet wire end is in a sudden stop and phase failure, the on-site PLC system is in a sudden stop and power failure, the direct current intermediate relay KA coil and the phase failure and phase sequence protection relay XJ are in a sudden stop and power failure, the auxiliary normally open contacts of the direct current intermediate relay KA and the phase failure and phase sequence protection relay XJ are all disconnected, the phase failure and phase sequence protection relay XJ is disconnected with a self-locking control loop of an alternating current contactor KM coil, and the alternating current contactor KM is disconnected with an inlet wire power supply of an electric control valve M, so that the electric control valve M keeps an original opening value and does not work; after the power is turned on, the on-site PLC system is restarted, the direct-current intermediate relay KA coil and the phase-failure and phase-sequence protection relay XJ are powered on, the auxiliary normally-open contacts of the direct-current intermediate relay KA and the phase-failure and phase-sequence protection relay XJ are closed, the auxiliary normally-closed contacts are opened, the electric regulating valve M has working conditions, and the electric regulating valve can work normally by pressing the torsion switch SB2 or the on-site PLC system opening point.
2. The electrically operated valve protection system of claim 1, wherein: a safety FU3 is connected in series between the hollow switch QF3 and the push button switch SB1 in the control loop of the alternating current contactor KM.
3. The electrically operated valve protection system according to claim 1 or 2, characterized in that: the power indicator HW of the electric regulating valve M is connected in parallel with the end A1 and the end A2 of the coil A1 of the alternating current contactor KM.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321827180.1U CN220306951U (en) | 2023-07-12 | 2023-07-12 | Protection system of electric regulating valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321827180.1U CN220306951U (en) | 2023-07-12 | 2023-07-12 | Protection system of electric regulating valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220306951U true CN220306951U (en) | 2024-01-05 |
Family
ID=89376272
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321827180.1U Active CN220306951U (en) | 2023-07-12 | 2023-07-12 | Protection system of electric regulating valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220306951U (en) |
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2023
- 2023-07-12 CN CN202321827180.1U patent/CN220306951U/en active Active
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