Online maintenance device and method for electric control valve

Abstract

The invention belongs to the field of maintenance application of isotope separation factories, and particularly relates to an online maintenance device and method for an electric regulating valve. The on-line maintenance device of the electric control valve is matched with a main water supply electric control valve of a nuclear power plant and comprises a supporting rod, a supporting seat, a connecting rod, an adjusting rod, a locking nut, a pin and a clamping groove, according to the on-line maintenance method for the electric control valve, the opening degree of the electric control valve is controlled by dismounting the electric control valve, assembling and maintaining the electric control valve, calibrating the opening degree of the electric control valve, and installing and pilot running the electric control valve. According to the online maintenance device and method for the electric control valve, the system pressure and flow can be kept stable, the safety of a process system in the fault maintenance and disposal process is ensured, and conditions are provided for autonomous maintenance of the electric control valve.

Description

Technical Field

[0001] The invention belongs to the field of isotope separation plant maintenance application, and in particular relates to an online maintenance device and method for an electric control valve. Background Art

[0002] Isotope separation plants generally use electric control valves as pressure and flow control equipment for the main process system. During the use of electric control valves, the motor reducer mechanism is connected to reduce speed and worm drive through gears. If the maintenance cycle of the mechanical transmission structure exceeds half a year, mechanical failure will occur, causing the valve to fail to operate normally and pressure control to fail, seriously affecting the safe and stable operation of the system; the electric control valve is installed in a special position and is not disconnected from the process system and cannot be dismantled for maintenance. Therefore, the valve opening should be strictly controlled during maintenance to ensure the stability of the system pressure.

[0003] The original maintenance operation mode requires that the valve rocker arm be simply supported and fixed through system bypass or using temporary struts, and then the reducer is dismantled and disassembled, and reinstalled and debugged after the fault is eliminated. However, through system bypass, the process needs to be adjusted frequently. In the case of a high frequency of daily maintenance, there is a greater risk of misoperation by process personnel; using struts for simple support and fixation can easily cause vibration during the removal and installation of the reducer, affecting the valve opening, causing system pressure fluctuations, affecting the safe and stable operation of the system, and limiting the space for disassembly and assembly of the reducer, affecting maintenance operations. Therefore, it is necessary to develop a special device for online maintenance of electric control valves to create feasible conditions for online maintenance of electric control valves in isotope separation plants and avoid the consequences of failures. Summary of the invention

[0004] In order to solve the problems existing in the above-mentioned technology, the present invention provides an online maintenance device for an electric control valve, which aims to quickly, safely and standardizedly position and support the rocker arm and improve the inherent safety of the disassembly and assembly of the reducer.

[0005] The technical solution of the present invention is as follows:

[0006] An online maintenance device for an electric regulating valve comprises a supporting rod, a supporting seat, a connecting rod, an adjusting rod, a locking nut a, a locking nut b and a locking nut c;

[0007] The support seat is placed at the bottom of the online maintenance device for the electric regulating valve, sleeved on the connecting rod and the regulating rod, and used to support the online maintenance device for the electric regulating valve;

[0008] The support rod is at the top of the online maintenance device of the electric regulating valve; the locking nut a is sleeved on the connecting rod to adjust the height of the support rod; the locking nut b and the locking nut c are sleeved on the adjusting rod to adjust the angle of the support rod.

[0009] The online maintenance device for the electric regulating valve also includes a pin and a clamping groove. The pin passes through a through hole on the supporting rod and is fixed at two ends of the clamping groove.

[0010] There are two pins and two slots. The two pins pass through the end and proximal end of the support rod respectively to form a hinge connection with the support rod. The lower ends of the two slots are fixedly connected to the connecting rod and the adjusting rod respectively.

[0011] The support seat has a rod-shaped structure, from which a wing-shaped plate-shaped structure extends.

[0012] The support seat rod-shaped structure is sleeved on the connecting rod and fixedly connected to the connecting rod through a locking nut a.

[0013] The wing-shaped plate structure of the support seat is sleeved on the adjusting rod and is fixedly connected to the adjusting rod through a locking nut b and a locking nut c.

[0014] An online maintenance method for an electric regulating valve comprises the following steps:

[0015] Step 1, open the cylinder of the electric regulating valve and remove the connector on the flat plate of the electric regulating valve;

[0016] Step 2: Place the online maintenance device of the electric regulating valve flat on a flat plate, adjust the height and angle of the support rod, use the support rod as a lever to lift the rocker arm upward, so that the driven wheel on the rocker arm is out of contact with the cam on the electric actuator;

[0017] Step 3: After the system pressure is stabilized within the allowable range, remove the electric actuator;

[0018] Step 4: inspect and maintain the electric actuator, and install and fix it after completion;

[0019] Step 5, perform a zero test and calibration of the mechanical position and the electric instrument position of the electric control valve after inspection and maintenance;

[0020] Step 6, control the opening of the electric regulating valve: the electric actuator drives the cam and the driven wheel to rotate, pushes the rocker arm to rotate, thereby driving the valve stem to swing, and the valve body moves along the axis of the cylinder to open and close the valve; through computer control, the "full close-full open-full close" state of the valve is repeatedly displayed, and the opening of the faulty electric regulating valve is corrected and calibrated;

[0021] Step 7, lower the rocker arm so that the driven wheel contacts the cam, and after the pressure stabilizes, install the connector on the electric regulating valve plate;

[0022] Step 8: Test run and continue to observe until the electric control valve operates normally.

[0023] In step 2, the method for adjusting the height and angle of the support rod is specifically as follows: adjust the locking nut a to change the extension length of the connecting rod to adjust the height of the support rod; adjust the position of the adjustment rod by adjusting the locking nut b and the locking nut c to adjust the angle of the support rod.

[0024] In step 2, the driven wheel on the rocker arm is out of contact with the cam on the electric actuator, with a gap of 0.1 mm.

[0025] In step 3, the system pressure is less than 5200Pa and the pressure change does not exceed 133Pa.

[0026] The remarkable effect of the present invention is that it provides an online maintenance device for an electric regulating valve, including a supporting rod, a supporting seat, a connecting rod and an adjusting rod, the supporting rod is hingedly connected with a pin, the pin is fixed at both ends of a slot, the lower ends of the two slots are respectively fixedly connected with the connecting rod and the adjusting rod, the extension length of the connecting rod is changed by adjusting the locking nut a to adjust the height of the supporting rod, the position of the adjusting rod is adjusted by the locking nut b and the locking nut c to adjust the angle of the supporting rod, thereby realizing the control of the opening of the electric regulating valve; the system pressure flow can be stabilized at a certain value, ensuring the safety and stability of the process system during the fault maintenance and disposal process; it provides a prerequisite for the autonomous maintenance of the electric regulating valve, helps to achieve a breakthrough in the autonomous maintenance of the electric regulating valve, reduces the maintenance cost, and reduces the cost of fault handling. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0028] Figure 1 This is the structural diagram of the electric control valve maintenance device;

[0029] Figure 2 It is a schematic diagram of the structure of the electric regulating valve;

[0030] Figure 3 This is a schematic diagram of the use of the electric control valve maintenance device;

[0031] Figure markings: 1-support rod; 2-support seat; 3-connecting rod; 4-adjusting rod; 5-locking nut a; 6-locking nut b; 7-locking nut c; 8-slot; 9-pin; 10-cylinder; 11-valve stem; 12-electric actuator; 13-rocker arm; 14-cam; 15-driven wheel; 16-valve body; 17-plate. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0033] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0035] In the description of the embodiments of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] An online maintenance device for an electric regulating valve provided in an embodiment of the present application includes: Figure 1 , used for Figure 2 The main feed water electric regulating valve of the nuclear power plant shown is being repaired.

[0037] The online maintenance device of an electric regulating valve comprises a supporting rod 1, a supporting seat 2, a connecting rod 3, an adjusting rod 4, a locking nut a5, a locking nut b6, a locking nut c7, a slot 8 and a pin 9.

[0038] The support rod 1 is located at the top of the online maintenance device of the electric regulating valve, and the pin 9 passes through the through hole on the support rod 1 and is fixed at both ends of the slot 8;

[0039] In some possible implementations of the embodiments of the present application, there are two groups of pins 9 and slots 8, and the two pins 9 pass through the end and proximal end of the support rod 1 respectively to form a hinge connection with the support rod 1.

[0040] The lower ends of the two clamping slots 8 are respectively welded and fixed to the connecting rod 3 and the adjusting rod 4 .

[0041] The support seat 2 is placed at the bottom of the electric regulating valve online maintenance device, and is sleeved on the connecting rod 3 and the regulating rod 4, and is used to support the electric regulating valve online maintenance device;

[0042] The bottom of the support seat 2 has a flat plate for fixing the online maintenance device of the electric regulating valve, which includes a rod-shaped structure, and a plate-shaped structure extends from the rod-shaped structure;

[0043] In this embodiment, the rod-shaped structure is cylindrical, and the plate-shaped structure is wing-shaped.

[0044] The connecting rod 3 is connected to the rod-shaped structure of the supporting seat 2, and the position of the connecting rod 3 is adjusted by adjusting the locking nut a5; the adjusting rod 4 is connected to the wing-shaped plate-shaped structure of the supporting seat 2, and the position of the adjusting rod 4 is adjusted by adjusting the locking nut b6 and the locking nut c7, thereby adjusting the angle of the supporting rod 1 and limiting and fixing the rocker arm 13 of the electric regulating valve.

[0045] The present invention provides an online maintenance method for an electric control valve. Figure 1 , Figure 2 , Figure 3 , including the following steps,

[0046] Step 1, open the electric regulating valve cylinder 10, and remove the electrical and instrument connectors on the electric regulating valve plate 17;

[0047] Step 2, place the electric regulating valve online maintenance device flat on the flat plate 17, use a 19mm open-end wrench to rotate the locking nut a5 on the supporting seat 2, and adjust the height of the supporting rod 1 by changing the extension length of the connecting rod 3 to facilitate assembly with the rocker arm 13; use a 19mm open-end wrench to rotate the locking nut b6 and the locking nut c7 to adjust the position of the adjusting rod 4 and the angle of the supporting rod 1;

[0048] Using the lever principle, the support rod 1 acts as a lever to lift the rocker arm 13 upward, so that the driven wheel 15 on the rocker arm 13 and the cam 14 on the electric actuator 12 are out of contact with a gap of 0.1 mm;

[0049] Step 3, the process operator observes the display of the local pressure instrument and confirms the pressure change with the control room in real time by phone to ensure that the system pressure is stable and within the allowable range of process operation, that is, the pressure is about 5100Pa and the pressure change does not exceed 133Pa. After the system pressure is stable within the allowable range, the electric actuator 12 is removed;

[0050] Step 4, inspect and maintain the electric actuator 12, and install and fix it after completion;

[0051] Step 5, perform a zero test and calibration of the mechanical position and the electric instrument position of the electric control valve after inspection and maintenance;

[0052] Step 6, the instrument personnel controls the opening of the electric regulating valve: the electric actuator 12 drives the cam 14 and the driven wheel 15 to rotate, pushing the rocker arm 13 to rotate, thereby driving the valve stem 11 to swing, and the valve body 16 moves along the axis direction of the cylinder 10 to open and close the valve; through computer control, the "full close-full open-full close" state of the valve is repeatedly displayed, and the opening of the faulty electric regulating valve is corrected and calibrated to restore the faulty electric regulating valve to a normal state;

[0053] Step 7, adjust the locking nut b6 and the locking nut c7 to adjust the adjusting rod 4 to lower the rocker arm 13, so that the driven wheel 15 contacts the cam 14, and after the pressure stabilizes, install the electrical and instrument connectors on the electric regulating valve plate 17;

[0054] Step 8: Test run and continue to observe until the electric control valve operates normally.

[0055] The above description is only a preferred embodiment of this patent and is not intended to limit this patent. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of this patent should be included in the scope of protection of this patent.

[0056] It should be noted that, for the above-mentioned method embodiments, for the sake of simplicity of description, they are all expressed as a series of action combinations, but those skilled in the art should be aware that the present application is not limited by the described action sequence, because according to the present application, certain steps can be performed in other sequences or simultaneously. Secondly, those skilled in the art should also be aware that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily required by the present application.

[0057] The preferred embodiments of the present application disclosed above are only used to help explain the present application. The optional embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of the present application. The present application selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present application, so that those skilled in the art can understand and use the present application well.

Claims

1. An online maintenance device for an electric regulating valve, characterized in that: It comprises a supporting rod (1), a supporting seat (2), a connecting rod (3), an adjusting rod (4), a locking nut a (5), a locking nut b (6) and a locking nut c (7); The support seat (2) is placed at the bottom of the electric regulating valve online maintenance device, sleeved on the connecting rod (3) and the regulating rod (4), and is used to support the electric regulating valve online maintenance device; The support rod (1) is at the top of the online maintenance device of the electric regulating valve; the locking nut a (5) is sleeved on the connecting rod (3) and is used to adjust the height of the support rod (1); the locking nut b (6) and the locking nut c (7) are sleeved on the adjusting rod (4) and are used to adjust the angle of the support rod (1).

2. The online maintenance device for an electric regulating valve according to claim 1 is characterized in that: It also comprises a pin (9) and a slot (8), wherein the pin (9) passes through a through hole on the support rod (1) and is fixed at both ends of the slot (8).

3. The online maintenance device for an electric regulating valve according to claim 2 is characterized in that: The number of the pins (9) and the number of the slots (8) are both two. The two pins (9) respectively pass through the end and proximal end of the support rod (1) to form a hinge connection with the support rod (1); the lower ends of the two slots (8) are respectively fixedly connected to the connecting rod (3) and the adjusting rod (4).

4. The online maintenance device for an electric regulating valve according to claim 1 is characterized in that: The support seat (2) has a rod-shaped structure, from which a wing-shaped plate-shaped structure extends.

5. The online maintenance device for an electric regulating valve according to claim 4 is characterized in that: The rod-shaped structure of the support seat (2) is sleeved on the connecting rod (3) and is fixedly connected to the connecting rod (3) via a locking nut a (5).

6. The online maintenance device for an electric regulating valve according to claim 4 is characterized in that: The wing-shaped plate-like structure of the support seat (2) is sleeved on the adjusting rod (4) and is fixedly connected to the adjusting rod (4) via a locking nut b (6) and a locking nut c (7).

7. An online maintenance method for an electric regulating valve, characterized in that: The following steps are involved: Step 1, open the electric regulating valve cylinder (10) and remove the connecting piece on the electric regulating valve plate (17); Step 2, placing the electric regulating valve online maintenance device flat on the flat plate (17), adjusting the height and angle of the support rod (1), using the support rod (1) as a lever to lift the rocker arm (13) upward, so that the driven wheel (15) on the rocker arm (13) is out of contact with the cam (14) on the electric actuator (12); Step 3, after the system pressure is stabilized within the allowable range, the electric actuator (12) is removed; Step 4, inspect and maintain the electric actuator (12), and install and fix it after completion; Step 5, perform a zero test and calibration of the mechanical position and the electric instrument position of the electric control valve after inspection and maintenance; Step 6, controlling the opening of the electric regulating valve: the electric actuator (12) drives the cam (14) and the driven wheel (15) to rotate, pushing the rocker arm (13) to rotate, thereby driving the valve stem (11) to swing, and the valve body (16) moves along the axis direction of the cylinder (10) to open and close the valve; through computer control, the "fully closed-fully open-fully closed" state of the valve is repeatedly displayed multiple times, and the opening of the faulty electric regulating valve is corrected and calibrated; Step 7, lower the rocker arm (13) to make the driven wheel (15) contact the cam (14), and after the pressure is stabilized, install the connector on the electric regulating valve plate (17); Step 8: Test run and continue to observe until the electric control valve operates normally.

8. The online maintenance method of an electric regulating valve according to claim 7 is characterized in that: In step 2, the method for adjusting the height and angle of the support rod (1) is specifically as follows: adjusting the locking nut a (5) to change the extension length of the connecting rod (3) and adjust the height of the support rod (1); adjusting the position of the adjustment rod (4) by means of the locking nut b (6) and the locking nut c (7) and adjust the angle of the support rod (1).

9. The method for online maintenance of an electric regulating valve according to claim 7, characterized in that: In step 2, the driven wheel (15) on the rocker arm (13) is out of contact with the cam (14) on the electric actuator (12) with a gap of 0.1 mm.

10. The online maintenance method of an electric regulating valve according to claim 7, characterized in that: In step 3, the system pressure is less than 5200Pa and the pressure change does not exceed 133Pa.

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