Intelligent electric actuating mechanism of nuclear power plant and transformation method of intelligent electric actuating mechanism

Abstract

The invention relates to the field of nuclear power executing mechanisms, in particular to a nuclear power plant intelligent electric executing mechanism and a transformation method thereof.The executing mechanism comprises an executing unit and a control unit, the executing unit comprises a mechanical and transmission mechanism, and the mechanical and transmission mechanism is connected with a torque sensor, a position sensor and a motor; the motor is sequentially connected with the temperature sensor, the temperature sensor is connected with the terminal strip, the torque sensor is sequentially connected with the voltage-to-current module and the terminal strip, and the position sensor is connected with the terminal strip; the control unit comprises a control module, an aviation plug and a current-to-voltage module, the control module is respectively connected with the aviation plug and the current-to-voltage module, the current-to-voltage module is connected with the aviation plug, and the aviation plug is connected with a terminal strip of the execution unit through a cable; the control module transmits a control signal to the execution module through the aviation plug. Through the arrangement of the circuit enhancement module, the communication distance is greatly prolonged, and the signal reliability is also greatly enhanced.

Description

Technical Field

[0001] The present invention relates to the field of nuclear power actuators, and in particular to an intelligent electric actuator for a nuclear power plant and a modification method thereof. Background Art

[0002] Many integrated intelligent electric actuators are used in the conventional island technology of nuclear power plant units. These integrated intelligent electric actuators are installed on on-site pipeline valves to complete the remote opening, closing or opening control of the pipeline valves.

[0003] At present, in order to prevent the harsh operating conditions such as pipeline vibration and high temperature from damaging the control unit components inside the integrated intelligent electric actuator, it is generally chosen to perform a split-type transformation of the integrated intelligent electric actuator. The transformation plan usually removes the control unit components and installs them in the surrounding electrical box, and directly extends the control signal.

[0004] The existing solution of simply extending the control signal has drawbacks. First, there's the issue of signal attenuation. After the electric actuator is modified, the control signals from the control unit components cannot be transmitted over long distances due to the influence of distributed parameters and signal reflections, limiting the separation distance. If the separation distance is large, the control signal is weak. Second, the split modification solution suffers from poor reliability. After the split, the control signals directly transmitted by the control components are susceptible to electromagnetic interference, which affects the reliability of the actuator and increases the risk of failure. Summary of the Invention

[0005] The present invention provides an intelligent electric actuator for a nuclear power plant and a modification method thereof, which are used to solve the problems in the prior art of large signal attenuation and electromagnetic interference in the signal after split modification of the intelligent electric actuator for a nuclear power plant.

[0006] The technical solutions of the present invention are as follows:

[0007] The present invention proposes an intelligent electric actuator for a nuclear power plant, which includes an actuator unit and a control unit. The actuator unit includes a mechanical and transmission mechanism, a motor, a torque sensor, a position sensor, a temperature sensor, a voltage-to-current module and a terminal block. The mechanical and transmission mechanism are respectively connected to the torque sensor, the position sensor and the motor, the motor is connected to the temperature sensor, the temperature sensor is connected to the terminal block, the torque sensor is sequentially connected to the voltage-to-current module and the terminal block, and the position sensor is connected to the terminal block; the control unit includes a control module, an aviation plug and a current-to-voltage module, the control module is respectively connected to the aviation plug and the current-to-voltage module, the current-to-voltage module is connected to the aviation plug, and the aviation plug is connected to the terminal block of the actuator unit through a cable; the control module transmits the control signal to the actuator module through the aviation plug.

[0008] In some embodiments, the terminal block of the execution unit and the aviation plug of the control unit are connected by a flexible shielded cable; the execution unit is arranged on the pipeline valve, and the control unit is arranged in the electrical control box, which is placed in an area not affected by pipeline vibration and temperature.

[0009] In some embodiments, the control module of the control unit includes a control circuit board, a relay circuit board, a motor drive module, a liquid crystal display and a magnetic control knob. The control circuit board is respectively connected to the relay circuit board, the motor drive module, the liquid crystal display and the magnetic control knob. The relay circuit board and the motor drive module are respectively connected to aviation plugs; the magnetic control knob transmits the control signal to the control circuit board, and the control circuit board transmits the control signal to the relay circuit board and the motor drive module.

[0010] In some embodiments, the 0-10V torque voltage signal of the torque sensor of the execution unit is converted into a 4-20mA current signal by the voltage-to-current module and transmitted to the control unit, and the current-to-voltage module of the control unit converts the 4-20mA current signal into a 0-10V torque voltage signal.

[0011] In some embodiments, the actuator is further provided with a single-ended to differential module and a differential to single-ended module. The single-ended to differential module is arranged in the circuit connection between the position sensor and the terminal block. The position sensor is connected to the single-ended to differential module, and the single-ended to differential module is connected to the terminal block; the differential to single-ended module is respectively connected to the aviation plug and the control circuit board; the position signal of the position sensor is converted into a differential signal through the single-ended to differential module and transmitted to the control unit, and the control unit restores the differential position signal to a position signal through the differential to single-ended module.

[0012] In some embodiments, the voltage-to-current module, the current-to-voltage module, the single-ended-to-differential module, and the differential-to-single-ended module are respectively connected to a power supply module, the power supply module is 24V, and the power supply module supplies power to the voltage-to-current module, the current-to-voltage module, the single-ended-to-differential module, and the differential-to-single-ended module.

[0013] The present invention proposes a method for modifying an intelligent electric actuator of a nuclear power plant, the method comprising:

[0014] Step 1: Disassemble the integrated intelligent electric actuator into a control unit and an execution unit;

[0015] Step 2: Connect the execution unit to the voltage-to-current module, the single-ended-to-differential module, and the terminal block;

[0016] Step 3: Connect the control unit to the current-to-voltage module, the differential-to-single-ended module, and the aviation plug;

[0017] Step 4: Install the control unit in the electric control box;

[0018] Step 5: Install the actuator unit on the pipeline valve;

[0019] Step 6: Install the electric control box and the electric control box mounting bracket in a good working position near the pipeline;

[0020] Step 7: Connect the terminal block of the actuator unit to the aviation plug of the control unit through a flexible shielded cable;

[0021] Step 8: Connect the voltage-to-current module, single-ended-to-differential module, current-to-voltage module, and differential-to-single-ended module to the power module respectively.

[0022] In some embodiments, the execution unit in step one includes a mechanical and transmission mechanism, a motor, a torque sensor, a position sensor and a temperature sensor, the motor is connected to the mechanical and transmission mechanism, the torque sensor and the position sensor are connected to the mechanical and transmission mechanism, and the temperature sensor is connected to the motor; the control unit includes a liquid crystal display, a magnetic control knob, a control circuit board, a motor drive module and a relay circuit board, the liquid crystal display and the magnetic control knob are respectively connected to the control circuit board, and the control circuit board is electrically connected to the motor drive module and the relay circuit board respectively.

[0023] In some embodiments, step two includes:

[0024] Step 2.1: Connect the voltage-to-current module to the torque sensor;

[0025] Step 2.2: Connect the single-ended to differential converter module to the position sensor;

[0026] Step 2.3: Connect the voltage-to-current converter, single-ended-to-differential converter, and temperature sensor to the terminal blocks.

[0027] In some embodiments, step three includes:

[0028] Step 3.1: Connect the current-to-voltage module to the control circuit board;

[0029] Step 3.2: Connect the differential to single-ended converter to the control circuit board;

[0030] Step 3.3: Connect the current-to-voltage module, differential-to-single-ended module, relay circuit board, and motor driver module to the aviation plugs respectively.

[0031] The implementation of the present invention has the following beneficial effects

[0032] This invention proposes an intelligent electric actuator for nuclear power plants and its modification method. By installing four circuit enhancement modules—a voltage-to-current module, a single-ended-to-differential module, a current-to-voltage module, and a differential-to-single-ended module—the communication distance is significantly extended, theoretically from 2 meters to 30 meters. This allows the control unit to be located in areas with good operating conditions. Furthermore, the signal is less susceptible to interference, significantly enhancing signal reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 A schematic diagram of an execution unit of an intelligent electric actuator for a nuclear power plant proposed in an embodiment of the present invention;

[0034] Figure 2 A schematic diagram of a control unit of an intelligent electric actuator for a nuclear power plant proposed in an embodiment of the present invention; DETAILED DESCRIPTION

[0035] The technical solution of the present invention is clearly and completely described below in conjunction with the accompanying drawings and specific embodiments. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0036] like Figures 1 to 2 As shown, the present invention proposes an intelligent electric actuator for nuclear power plants. The actuator comprises an actuator unit and a control unit, connected by a shielded flexible cable. The actuator unit is mounted on a pipeline valve, and the control unit is housed in an electrical control box, which is placed in an area unaffected by pipeline vibration and temperature.

[0037] The actuator unit includes a mechanical and transmission mechanism, a motor, a torque sensor, a position sensor, a temperature sensor, a voltage-to-current module, a single-ended-to-differential module, and a terminal block. The mechanical and transmission mechanism is connected to the torque sensor, position sensor, and motor via wires. The torque sensor is connected to the voltage-to-current module via wires, and the voltage-to-current module is connected to the terminal block via wires. The position sensor is connected to the single-ended-to-differential module via wires, and the single-ended-to-differential module is connected to the terminal block via wires. The motor is connected to the temperature sensor via wires, and the temperature sensor is connected to the terminal block via wires. The mechanical and transmission mechanism is used to control the valve. The torque sensor and position sensor measure the torque and position signals of the mechanical and transmission mechanism, respectively, and the temperature sensor measures the temperature signal of the motor.

[0038] The control unit includes a control circuit board, a relay circuit board, a motor drive module, a current-to-voltage module, a differential-to-single-ended module, an aviation plug, an LCD display, and a magnetic control knob. The control circuit board is connected to the relay circuit board, motor drive module, current-to-voltage module, differential-to-single-ended module, LCD display, and magnetic control knob via wires. The relay circuit board, motor drive module, current-to-voltage module, and differential-to-single-ended module are each connected to the aviation plug via wires. The aviation plug is connected to the terminal block of the actuator via a shielded flexible cable, enabling signal transmission from the control unit to the actuator. The LCD displays relevant information collected by the actuator. The magnetic control knob transmits control signals to the control circuit board. The control circuit board receives the control signals and transmits them to the relay circuit board and motor drive module, respectively. The relay circuit board and motor drive module control the actuator, thereby enabling the actuator to operate.

[0039] In this actuator, the actuator's torque sensor's 0-10V torque voltage signal is converted into a 4-20mA current signal by a voltage-to-current module and transmitted to the control unit. The control unit's current-to-voltage module then converts the 4-20mA current signal into a 0-10V torque voltage signal. The position sensor's position signal is converted into a differential signal by a single-ended-to-differential module and transmitted to the control unit. The control unit then converts the differential position signal back into a position signal using a differential-to-single-ended module. This signal conversion significantly enhances signal transmission strength and interference resistance, significantly extending the communication distance, theoretically extending it from 2m to 30m.

[0040] The actuator is also provided with a 24V power supply module, which is connected to the above-mentioned voltage-to-current module, current-to-voltage module, single-ended-to-differential module and differential-to-single-ended module. The 24V power supply module is used to power the above-mentioned four circuit enhancement modules.

[0041] This invention proposes a method for retrofitting an intelligent electric actuator in a nuclear power plant. Many integrated intelligent electric actuators are used in conventional island processes for nuclear power plant units. This method uses the SND-Z20 integrated intelligent electric actuator as an example to perform a separate retrofit. The SND-Z20 integrated intelligent electric actuator consists of an actuator unit and a control unit. The control unit is manually operated, and the actuator control unit manipulates the actuator control unit to achieve valve control.

[0042] The method specifically includes:

[0043] Step 1: Disassemble the integrated intelligent electric actuator and decompose it into an actuator control unit and an actuator execution unit; wherein, the execution unit includes a mechanical and transmission mechanism, a motor, a torque sensor, a position sensor and a temperature sensor, the motor is connected to the mechanical and transmission mechanism, the torque sensor and the position sensor are connected to the mechanical and transmission mechanism, and the temperature sensor is connected to the motor; the control unit includes a liquid crystal display, a magnetic control knob, a control circuit board, a motor drive module and a relay circuit board, the liquid crystal display and the magnetic control knob are respectively connected to the control circuit board, and the control circuit board is electrically connected to the motor drive module and the relay circuit board.

[0044] Step 2: Connect the execution unit to the voltage-to-current converter, the single-ended-to-differential converter, and the terminal block.

[0045] Step 2.1: Connect the voltage-to-current module to the torque sensor;

[0046] Step 2.2: Connect the single-ended to differential converter module to the position sensor;

[0047] Step 2.3: Connect the voltage-to-current converter, single-ended-to-differential converter, and temperature sensor to the terminal blocks.

[0048] Step 3: Connect the control unit to the current-to-voltage module, the differential-to-single-ended module, and the aviation plug.

[0049] Step 3.1: Connect the current-to-voltage module to the control circuit board;

[0050] Step 3.2: Connect the differential to single-ended converter to the control circuit board;

[0051] Step 3.3: Connect the current-to-voltage module, differential-to-single-ended module, relay circuit board, and motor driver module to the aviation plugs respectively.

[0052] Step 4: Install the control unit in the electrical control box.

[0053] Step 5: Install the actuator unit on the pipeline valve.

[0054] Step 6: Install the electric control box and the electric control box mounting bracket in a good working position near the pipeline.

[0055] Step 7: Connect the terminal block of the actuator unit to the aviation plug of the control unit through a flexible shielded cable.

[0056] Step 8: Connect the voltage-to-current module, single-ended-to-differential module, current-to-voltage module, and differential-to-single-ended module to the power module. The power module is used to power the four circuit enhancement modules.

[0057] The above embodiments merely illustrate several implementations of the present invention, and while their descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make numerous modifications and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. An intelligent electric actuator for a nuclear power plant, characterized in that: The actuator includes an actuator unit and a control unit. The actuator unit includes a mechanical and transmission mechanism, a motor, a torque sensor, a position sensor, a temperature sensor, a voltage-to-current module and a terminal block. The mechanical and transmission mechanism are respectively connected to the torque sensor, the position sensor and the motor, the motor is connected to the temperature sensor, the temperature sensor is connected to the terminal block, the torque sensor is sequentially connected to the voltage-to-current module and the terminal block, and the position sensor is connected to the terminal block; the control unit includes a control module, an aviation plug and a current-to-voltage module, the control module is respectively connected to the aviation plug and the current-to-voltage module, the current-to-voltage module is connected to the aviation plug, and the aviation plug is connected to the terminal block of the actuator unit through a cable; the control module transmits the control signal to the actuator module through the aviation plug.

2. The intelligent electric actuator for a nuclear power plant according to claim 1, characterized in that: The terminal block of the execution unit and the aviation plug of the control unit are connected through a flexible shielded cable; the execution unit is arranged on the pipeline valve, and the control unit is arranged in an electric control box, and the electric control box is placed in an area not affected by pipeline vibration and temperature.

3. The intelligent electric actuator for a nuclear power plant according to claim 2, characterized in that: The control module of the control unit includes a control circuit board, a relay circuit board, a motor drive module, a liquid crystal display and a magnetic control knob. The control circuit board is respectively connected to the relay circuit board, the motor drive module, the liquid crystal display and the magnetic control knob. The relay circuit board and the motor drive module are respectively connected to the aviation plug; the magnetic control knob transmits the control signal to the control circuit board, and the control circuit board transmits the control signal to the relay circuit board and the motor drive module.

4. The intelligent electric actuator for a nuclear power plant according to claim 3, characterized in that: The 0-10V torque voltage signal of the torque sensor of the execution unit is converted into a 4-20mA current signal by the voltage-to-current module and transmitted to the control unit. The current-to-voltage module of the control unit converts the 4-20mA current signal into a 0-10V torque voltage signal.

5. The intelligent electric actuator for a nuclear power plant according to claim 4, characterized in that: The actuator is also provided with a single-ended to differential module and a differential to single-ended module. The single-ended to differential module is arranged in the circuit connection between the position sensor and the terminal block. The position sensor is connected to the single-ended to differential module, and the single-ended to differential module is connected to the terminal block; the differential to single-ended module is respectively connected to the aviation plug and the control circuit board; the position signal of the position sensor is converted into a differential signal by the single-ended to differential module and transmitted to the control unit, and the control unit restores the differential position signal to a position signal through the differential to single-ended module.

6. The intelligent electric actuator for a nuclear power plant according to claim 5, characterized in that: The voltage-to-current module, current-to-voltage module, single-ended-to-differential module and differential-to-single-ended module are respectively connected to a power supply module, the power supply module is 24V, and the power supply module supplies power to the voltage-to-current module, current-to-voltage module, single-ended-to-differential module and differential-to-single-ended module.

7. A method for modifying an intelligent electric actuator in a nuclear power plant according to any one of claims 1 to 6, characterized in that: The method comprises: Step 1: Disassemble the integrated intelligent electric actuator into a control unit and an execution unit; Step 2: Connect the execution unit to the voltage-to-current module, the single-ended-to-differential module, and the terminal block; Step 3: Connect the control unit to the current-to-voltage module, the differential-to-single-ended module, and the aviation plug; Step 4: Install the control unit in the electric control box; Step 5: Install the actuator unit on the pipeline valve; Step 6: Place the electrical control box and the electrical control box mounting bracket in an area that is not affected by pipeline vibration and temperature; Step 7: Connect the terminal block of the execution unit to the aviation plug of the control unit through a flexible shielded cable; Step 8: Connect the voltage-to-current module, single-ended-to-differential module, current-to-voltage module, and differential-to-single-ended module to the power module respectively.

8. The method for modifying an intelligent electric actuator of a nuclear power plant according to claim 7, characterized in that: The execution unit in step one includes a mechanical and transmission mechanism, a motor, a torque sensor, a position sensor and a temperature sensor, the motor is connected to the mechanical and transmission mechanism, the torque sensor and the position sensor are connected to the mechanical and transmission mechanism, and the temperature sensor is connected to the motor; the control unit includes a liquid crystal display, a magnetic control knob, a control circuit board, a motor drive module and a relay circuit board, the liquid crystal display and the magnetic control knob are respectively connected to the control circuit board, and the control circuit board is electrically connected to the motor drive module and the relay circuit board.

9. The method for modifying an intelligent electric actuator of a nuclear power plant according to claim 8, characterized in that: The second step includes: Step 2.1: Connect the voltage-to-current module to the torque sensor; Step 2.2: Connect the single-ended to differential converter module to the position sensor; Step 2.3: Connect the voltage-to-current module, the single-ended-to-differential module, and the temperature sensor to the terminal block respectively.

10. The method for modifying an intelligent electric actuator of a nuclear power plant according to claim 8, characterized in that: The step three includes: Step 3.1: Connect the current-to-voltage module to the control circuit board; Step 3.2: Connect the differential to single-ended converter to the control circuit board; Step 3.3: Connect the current-to-voltage module, the differential-to-single-ended module, the relay circuit board, and the motor drive module to the aviation plug respectively.

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