Nuclear power station split type intelligent electric actuating mechanism and splitting method thereof

Abstract

The invention relates to the field of nuclear power electric actuating mechanisms, in particular to a nuclear power station split type intelligent electric actuating mechanism and a splitting method thereof.The nuclear power station split type intelligent electric actuating mechanism comprises an actuating mechanism end cover, an actuating mechanism actuating unit, an actuating mechanism control unit, an electric cabinet and an electric cabinet mounting support; the execution mechanism execution unit is arranged on a nuclear power plant pipeline valve, the execution mechanism control unit is arranged in an electric cabinet, the execution mechanism control unit is connected with the execution mechanism execution unit through a cable, and an end cover is arranged on the execution mechanism control unit; and the electric control box is arranged on the electric control box mounting bracket. Control elements and related circuits in the electric actuating mechanism are separated from the body and installed in the electric control box with good accessory working conditions, and are not influenced by field vibration and pipeline vibration, so that the problems that control element wiring is easy to loosen, circuit board welding spots are easy to loosen, elements are easy to fall off and the like are solved, and the fault occurrence rate of the electric actuating mechanism is reduced.

Description

Technical Field

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

[0002] Due to the special operating conditions of radioactive, high-temperature, and high-pressure media, nuclear power plant units utilize numerous integrated intelligent electric actuators in their conventional island processes. These are installed on on-site pipeline valves to remotely open, close, or control the valve's degree of opening. A key feature of integrated intelligent electric actuators is their integration: the actuator's mechanical transmission and control components are integrated and installed on the pipeline valve.

[0003] In the existing technology, this type of integrated intelligent electric actuator has the following drawbacks when used on-site. On the one hand, the on-site operating conditions of most process systems in nuclear power plants are relatively harsh, and many pipelines vibrate significantly, especially when starting and stopping pumps. The integrated intelligent electric actuator is affected by pipeline vibration for a long time, which can easily lead to problems such as loose wiring of internal control components of the actuator, desoldering of control board solder joints, and even component shedding, resulting in frequent fault alarms. In serious cases, it can even affect the safe and reliable operation of the system and even the entire power plant. On the other hand, the medium temperature in some pipelines is very high. Since the electric actuator is close to the pipeline, it has to withstand the test of high temperature for a long time. In particular, the electrical components in the actuator control unit are more sensitive to temperature, and long-term high temperature will also accelerate the aging of electrical components. Summary of the Invention

[0004] The present invention provides a split-type intelligent electric actuator for a nuclear power plant and a splitting method thereof, which are used to solve the problems in the prior art of easy failure of components due to pipeline vibration and reduced component life due to high temperature environment.

[0005] The technical solutions of the present invention are as follows:

[0006] The present invention proposes a split-type intelligent electric actuator for a nuclear power plant, which includes an actuator end cover, an actuator executing unit, an actuator control unit, an electric control box and an electric control box mounting bracket. The actuator executing unit is arranged on a pipeline valve of the nuclear power plant, the actuator control unit is arranged in the electric control box, the actuator control unit is connected to the actuator executing unit through a cable, and an end cover is provided on the actuator control unit; the electric control box is arranged on the electric control box mounting bracket.

[0007] In some embodiments, the actuator 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 arranged on the end cover. The liquid crystal display and the magnetic control knob are electrically connected to the control circuit board respectively. The magnetic control knob transmits control instructions to the control circuit board; the control circuit board is electrically connected to the motor drive module and the relay circuit board respectively. The control circuit board transmits control instructions to the motor drive module and the relay circuit board. The motor drive module and the relay circuit board operate the actuator execution unit to control the valve.

[0008] In some embodiments, the electric control box and the electric control box mounting bracket are arranged in an area not affected by pipeline vibration and pipeline temperature; the actuator control unit is connected to the actuator control unit through a flexible shielded cable.

[0009] In some embodiments, the electric control box is made of aluminum alloy and the surface is anodized; the electric control box includes an end cover mounting interface, a cavity and a wire outlet hole, an end cover mounting interface is provided on one side of the cavity, and a wire outlet hole is provided on the other side of the cavity; the actuator control unit is arranged inside the cavity, the end cover is installed on the outside of the end cover mounting interface, the end cover mounting interface and the end cover are sealed, the wire outlet hole is connected to the flexible shielded cable, and the flexible shielded cable is connected to the actuator control unit through a sealed gland or an aviation plug.

[0010] In some embodiments, the electric control box mounting bracket is provided with multiple mounting holes of different heights, which are used to fix the electric control box, and the height of the electric control box is adjusted by installing different mounting holes; a base plate is provided at the bottom of the electric control box bracket, and the base plate is fixed to the ground by bolts.

[0011] In some embodiments, the bottom plate is a flat plate with a length of 40 mm, a width of 40 mm, and a height of 20 mm, and the bottom plate is fixed to the ground by four bolts.

[0012] The present invention proposes a method for separating a split-type intelligent electric actuator of a nuclear power plant, the method comprising:

[0013] Step 1: Disassemble the integrated intelligent electric actuator into the end cover, actuator control unit and actuator execution unit;

[0014] Step 2: Install the sealing end cover at the position where the end cover of the actuator unit was removed;

[0015] Step 3: Install the actuator control unit in the electric control box, install the end cover on the electric control box, and install the electric control box on the electric control box mounting bracket;

[0016] Step 4: Install the actuator unit on the pipeline valve;

[0017] Step 5: Install the electric control box and the electric control box mounting bracket in a location that is not affected by pipeline vibration and high temperature;

[0018] Step 6: Use a flexible shielded connecting cable to connect the actuator control unit and the actuator actuating unit in the electric control box.

[0019] In some embodiments, the sealing end cover in step 2 adopts a blind cover structure, is made of aluminum alloy, and is anodized on the surface; a sealing groove is opened at the sealing end cover, and the sealing groove cooperates with the end cover sealing surface and sealing ring of the integrated intelligent electric actuator, thereby sealing the actuator execution unit.

[0020] In some embodiments, in step three, the actuator control unit is installed in the electric control box, the end cover is installed on the electric control box, and the electric control box is installed on the electric control box mounting bracket, specifically including: installing the actuator control unit in the electric control box cavity; installing the end cover on the outside of the end cover mounting interface of the electric control box, and sealing the end cover mounting interface and the end cover; connecting the actuator control unit to the aviation plug, and setting the aviation plug at the wire outlet hole position of the electric control box.

[0021] The implementation of the present invention has the following beneficial effects:

[0022] The present invention proposes a split-type intelligent electric actuator for a nuclear power plant and a splitting method thereof. By adopting a splitting technical solution, the fragile components in the integrated intelligent electric actuator are separated and installed in a remote dedicated electric control box. Compared with the pre-split modification, it has the following advantages:

[0023] 1. Reduce the failure rate of electric actuators. The control components and related circuits in the electric actuator are separated from the main body and installed in a nearby electric control box with good working conditions. They are not affected by site vibration and pipeline vibration. This solves the problems of loose control component wiring, easy desoldering of circuit board solder joints, and easy component shedding, thus reducing the failure rate of electric actuators.

[0024] 2. Extend the life of the electric actuator. Before the modification, the electrical components of the electric actuator control unit were exposed to high temperatures for a long time, which accelerated their aging process. After the split modification of the present invention, these electrical components are protected from the effects of high temperatures, thereby extending the life of the electric actuator. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A schematic diagram of a split-type intelligent electric actuator for a nuclear power plant proposed in an embodiment of the present invention;

[0026] Figure 2 A diagram showing a sealing end cover of a split-type intelligent electric actuator for a nuclear power plant proposed in an embodiment of the present invention;

[0027] Figure 3 A schematic diagram of an electric control box for a split-type intelligent electric actuator for a nuclear power plant proposed in an embodiment of the present invention;

[0028] Figure 4 A schematic diagram of an electric actuator before disassembly, according to a method for disassembling a split-type intelligent electric actuator for a nuclear power plant proposed in an embodiment of the present invention;

[0029] Description of the drawings: 1. Actuator unit; 2. Cable; 3. Electric control box; 4. Electric control box mounting bracket; 5. Valve; 6. Pipeline; 7. Handwheel; 8. End cover; 9. LCD display; 10. Magnetic control knob; 11. Sealing end cover; 31. End cover mounting interface; 32. Cavity; 33. Wire outlet hole; 41. Mounting hole; 42. Base plate. DETAILED DESCRIPTION

[0030] 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.

[0031] like Figures 1 to 4 As shown, the present invention proposes a split-type intelligent electric actuator for a nuclear power plant, comprising an end cover 8, an actuator unit 1, an actuator control unit, an electric control box 3, and an electric control box mounting bracket 4. The actuator unit 1 is arranged on a valve 5 on a pipeline 6 of a nuclear power plant. The actuator unit 1 is connected to the actuator control unit via a flexible shielded cable 2. The actuator control unit is provided with an end cover 8.

[0032] The actuator control unit is housed within the electrical control box 3, which is mounted on the electrical control box mounting bracket 4. The electrical control box 3 and the electrical control box mounting bracket 4 are located in an area unaffected by the vibration and temperature of the pipeline 6. The actuator control unit includes an LCD 9, a magnetic control knob 10, a control circuit board, a motor drive module, and a relay circuit board. The LCD 9 and magnetic control knob 10 are mounted on the end cap 8. The LCD 9 and magnetic control knob 10 are each electrically connected to the control circuit board, which transmits control commands to the control circuit board. The control circuit board is also electrically connected to the motor drive module and the relay circuit board, which transmit control commands to the motor drive module and the relay circuit board. The motor drive module and the relay circuit board operate the actuator unit to control the valve 5.

[0033] The electric control box 3 is made of aluminum alloy and its surface is anodized. The electric control box 3 includes an end cover mounting interface 31, a cavity 32 and a wire outlet 33. An end cover mounting interface 31 is provided on one side of the cavity 32, and a wire outlet 33 is provided on the other side of the cavity 32. The cavity 32 of the electric control box 3 can accommodate components with a diameter of less than 200 mm and a weight not exceeding 10 kg. The actuator control unit components are installed in this cavity 32. The end cover 8 is installed on the outside of the end cover mounting interface 31, and the end cover mounting interface 31 and the end cover 8 are sealed. The wire outlet 33 is connected to the flexible shielded cable 2, and the flexible shielded cable 2 is connected to the actuator control unit through a sealed gland or an aviation plug to ensure that the protection level of the actuator control unit remains unchanged. At the same time, the actuator control unit is connected to the shielded cable 2 with the aviation plug.

[0034] The bracket of the electric control box 3 is provided with multiple mounting holes 41 of different heights. The mounting holes 41 are used to fix the electric control box 3. The height of the electric control box 3 is adjusted by installing different mounting holes 41. The bottom of the bracket of the electric control box 3 is provided with a base plate 42. The base plate 42 is a flat plate with a length of 40 mm, a width of 40 mm, and a height of 20 mm. The base plate 42 is fixed to the ground by 4 bolts of size M12, thereby enhancing the structural stability.

[0035] The present invention proposes a method for splitting a split-type intelligent electric actuator in a nuclear power plant. Many integrated intelligent electric actuators are used in conventional island processes of nuclear power plant units. This method takes the BERNARD-ST14 integrated intelligent electric actuator as an example and splits it to reduce the damage of the electric actuator to the pipeline 6. Figure 4 As shown, the BERNARD-ST14 integrated intelligent electric actuator includes a handwheel 7, an end cap 8, an actuator unit 1, and an actuator control unit. The actuator unit 1 is provided with the actuator control unit at its rear end, and the end cap 8 is mounted on the actuator control unit. The handwheel 7 is mounted on the upper end of the actuator unit 1. The actuator control unit includes an LCD 9 and a magnetic control knob 10 mounted on the end cap 8, a control circuit board connected to the LCD 9 and magnetic control knob 10, and a motor drive module and relay circuit board connected to the control circuit board. Manual operation of the magnetic control knob 10 causes the actuator control unit to operate the actuator control unit, thereby controlling the valve 5.

[0036] The method specifically includes:

[0037] Step 1: Disassemble the integrated intelligent electric actuator into the end cover 8, the actuator control unit and the actuator execution unit 1;

[0038] Step 2: Install the sealing end cover 11 at the position where the end cover 8 is removed from the actuator execution unit 1; in step 2, the sealing end cover 11 adopts a blind cover structure, is made of aluminum alloy, and has an anodized surface; a sealing groove is provided at the sealing end of the sealing end cover 11, and the sealing groove cooperates with the sealing surface and sealing ring of the end cover 8 of the integrated intelligent electric actuator, thereby sealing the actuator execution unit 1.

[0039] Step 3: The actuator control unit is installed in the electric control box 3, and the electric control box 3 is installed on the electric control box mounting bracket 4, specifically including: installing the actuator control unit in the cavity 32 of the electric control box 3; installing the end cover 8 on the outside of the end cover mounting interface 31 of the electric control box 3, and sealing the end cover mounting interface 31 and the end cover 8; connecting the actuator control unit to the aviation plug, and setting the aviation plug at the wire outlet hole 33 of the electric control box 3.

[0040] Step 4: Install the actuator unit 1 on the pipe 6 valve 5;

[0041] Step 5: Install the electric control box 3 and the electric control box mounting bracket 4 in a good working condition near the pipe 6;

[0042] Step 6: Use the flexible shielded connecting cable 2 to connect the actuator control unit and the actuator execution unit 1 in the electric control box 3.

[0043] The control components and related circuits in the electric actuator are separated from the main body and installed in an electric control box with good accessory working conditions. They are not affected by site vibration and pipeline vibration. This solves the problems of loose control component wiring, easy desoldering of circuit board solder joints, and easy falling off of components, thereby reducing the failure rate of the electric actuator.

[0044] 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. A split-type intelligent electric actuator for a nuclear power plant, characterized in that: The actuator comprises an actuator bracket end cover (8), an actuator actuating unit (1), an actuator control unit, an electric control box (3) and an electric control box mounting bracket (4); the actuator actuating unit (1) is arranged on a valve (5) of a nuclear power plant pipeline (6); the actuator control unit is arranged in the electric control box (3); the actuator control unit is connected to the actuator bracket actuating unit via a cable (2); the actuator control unit is provided with an end cover (8); and the electric control box (3) is arranged on the electric control box mounting bracket (4).

2. A split-type intelligent electric actuator for a nuclear power plant according to claim 1, characterized in that: The actuator control unit includes a liquid crystal display (9), a magnetic control knob (10), a control circuit board, a motor drive module and a relay circuit board. The liquid crystal display (9) and the magnetic control knob (10) are arranged on the end cover (8). The liquid crystal display (9) and the magnetic control knob (10) are electrically connected to the control circuit board respectively. The magnetic control knob (10) transmits control instructions to the control circuit board; the control circuit board is electrically connected to the motor drive module and the relay circuit board respectively. The control circuit board transmits control instructions to the motor drive module and the relay circuit board. The motor drive module and the relay circuit board operate the actuator execution unit to control the valve (5).

3. A split-type intelligent electric actuator for a nuclear power plant according to claim 2, characterized in that: The electric control box (3) and the electric control box mounting bracket (4) are arranged in an area not affected by the vibration of the pipeline (6) and the temperature of the pipeline (6); the actuator control unit is connected to the actuator control unit via a flexible shielded cable (2).

4. A split-type intelligent electric actuator for a nuclear power plant according to claim 3, characterized in that: The electric control box (3) is made of aluminum alloy, and its surface is anodized; the electric control box (3) comprises an end cover mounting interface (31), a cavity (32) and a wire outlet (33); the end cover mounting interface (31) is provided on one side of the cavity (32), and the wire outlet (33) is provided on the other side of the cavity (32); the actuator control unit is arranged inside the cavity (32), the end cover (8) is mounted on the outside of the end cover mounting interface (31), the end cover mounting interface (31) and the end cover (8) are sealed, and the wire outlet (33) is connected to the flexible shielded cable (2), and the flexible shielded cable (2) is connected to the actuator control unit through a sealing gland or an aviation plug.

5. A split-type intelligent electric actuator for a nuclear power plant according to claim 4, characterized in that: The electric control box mounting bracket (4) is provided with a plurality of mounting holes (41) at different heights, the mounting holes (41) being used for fixedly connecting the electric control box (3), and the height of the electric control box (3) is adjusted by installing different mounting holes (41); a base plate (42) is provided at the bottom of the electric control box (3) bracket, and the base plate (42) is fixed to the ground by bolts.

6. A split-type intelligent electric actuator for a nuclear power plant according to claim 5, characterized in that: The bottom plate (42) is a flat plate with a length of 40 mm, a width of 40 mm, and a height of 20 mm. The bottom plate (42) is fixed to the ground by four bolts.

7. A method for separating a split-type intelligent electric actuator for a nuclear power plant according to claims 1-6, characterized in that: The method comprises: Step 1: disassembling the integrated intelligent electric actuator into an end cover (8), an actuator control unit, and an actuator execution unit (1); Step 2: Installing a sealing end cover (11) at the position where the end cover (8) of the actuator execution unit (1) was removed; Step 3: The actuator control unit is installed in the electric control box (3), the end cover (8) is installed on the electric control box (3), and the electric control box (3) is installed on the electric control box mounting bracket (4); Step 4: Install the actuator unit (1) on the valve (5) of the pipeline (6); Step 5: Install the electric control box (3) and the electric control box mounting bracket (4) in a position that is not affected by the vibration and high temperature of the pipeline (6); Step 6: Use a flexible shielded connecting cable (2) to connect the actuator control unit in the electric control box (3) and the actuator execution unit (1).

8. The method for separating a split-type intelligent electric actuator for a nuclear power plant according to claim 7, characterized in that: In the second step, the sealing end cover (11) adopts a blind cover structure, is made of aluminum alloy, and has an anodized surface. A sealing groove is provided at the sealing end of the sealing end cover (11), and the sealing groove cooperates with the sealing surface and sealing ring of the end cover (8) of the integrated intelligent electric actuator, thereby sealing the actuator execution unit (1).

9. The method for separating a split-type intelligent electric actuator for a nuclear power plant according to claim 7, characterized in that: In the step 3, the actuator control unit is installed in the electric control box (3), the end cover (8) is installed on the electric control box (3), and the electric control box (3) is installed on the electric control box mounting bracket (4), specifically comprising: installing the actuator control unit in the cavity (32) of the electric control box (3); installing the end cover (8) on the outside of the end cover mounting interface (31) of the electric control box (3), and sealing the end cover mounting interface (31) and the end cover (8); connecting the actuator control unit to an aviation plug, and arranging the aviation plug at the outlet hole (33) of the electric control box (3).

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