Nuclear power unit main steam isolation valve blue oil test device and method

Abstract

The invention belongs to the technical field of blue oil tests, and aims to solve the problem of difficulty in centering depending on a manual or manual device in the gate movement process, reduce the labor intensity, improve the operation efficiency and ensure the authenticity of blue oil test results. The invention provides a blue oil test device and method for a main steam isolation valve of a nuclear power unit. The device comprises a rack, a clamping assembly and a driving assembly, and the rack is used for providing a supporting and fixing site; the clamping assemblies are arranged at the two ends of the rack and provided with clamping jaws used for clamping the inwards-concave annular surface of the top end of the valve body. The driving assembly vertically penetrates through the rack, and the bottom of the driving assembly is connected with the flashboard and used for driving the flashboard to do forward / reverse motion. The device is reliable in clamping and has guiding and centering adjusting functions.

Description

Technical Field

[0001] The present application belongs to the technical field of blue oil testing, and in particular, relates to a blue oil testing device and method for a main steam isolation valve of a nuclear power unit. Background Art

[0002] The main steam isolation valve body type of most domestic nuclear power plants is a wedge-type gate valve. The sealing of this type of valve is achieved by the contact between the gate and the valve seat. After dismantling and maintenance, the sealing performance between the gate and the valve seat is generally tested through a blue oil test.

[0003] When conducting a blue oil test, first apply blue oil to the gate sealing surface, then use a certain pressure to make the gate and the valve seat sealing surface fit completely, and finally move the gate out of the valve body and observe the distribution of blue oil on the gate sealing surface to judge the valve sealing performance. If the above-mentioned movement process of fitting and separating the gate and the valve seat is carried out by manpower, hoisting or manual devices, it is easy to cause unstable clamping, inaccurate alignment of the gate and the valve seat, insufficient test driving force, and other problems. The test is difficult to succeed in one time and the operation is laborious. At the same time, there may be a situation where the gate and the valve seat are difficult to separate after fitting due to insufficient reverse driving force. In addition, if the blue oil test is carried out after the actuator is reinstalled, the actuator needs to be disassembled and the valve disassembled again, which will consume a lot of manpower and time, and will cause a large delay in the overhaul period of the nuclear power plant. Summary of the invention

[0004] The purpose of the present application is to provide a blue oil test device and method for the main steam isolation valve of a nuclear power unit, so as to solve the problem of difficulty in centering the gate by manpower or manual devices during movement, reduce labor intensity, improve work efficiency, and ensure the authenticity of the blue oil test results.

[0005] In order to achieve the above objectives, this application provides the following technical solutions:

[0006] In a first aspect, the present application provides a blue oil test device for a main steam isolation valve of a nuclear power unit, comprising:

[0007] A rack to provide a support and fixing point;

[0008] A clamping assembly is arranged at both ends of the frame, and the clamping assembly has a clamping claw for clamping the concave annular surface of the top end of the valve body;

[0009] The driving component is vertically arranged through the frame, and the bottom of the driving component is connected to the gate plate to drive the gate plate to perform forward / reverse movement.

[0010] In some embodiments, the frame is composed of two parallel beams fixedly connected by bolts, and the two beams are symmetrically arranged.

[0011] In some embodiments, a slide groove is provided on the inner side of the crossbeam, and the clamp is slidably mounted on the slide groove.

[0012] In some embodiments, the rack is arranged horizontally.

[0013] In some embodiments, the clamp has a top, a middle and a bottom, the top is installed in a slide slot of the frame and is connected by a clamp locking bolt.

[0014] In some embodiments, the clamping assembly further includes a centering adjustment bolt, which is arranged perpendicular to the clamping jaw locking bolt and is mounted on the frame.

[0015] In some embodiments, the drive assembly includes a double-acting hydraulic cylinder, a piston rod, and a gate connecting rod connected in sequence from top to bottom.

[0016] In some embodiments, the piston rod and the gate connecting rod are connected by a quick-release locating pin.

[0017] In some embodiments, a groove-shaped connecting portion is provided at the bottom of the piston rod to adapt to the top of the gate connecting rod.

[0018] In a second aspect, the present application provides a blue oil test method for a main steam isolation valve of a nuclear power unit, comprising:

[0019] Step 1: The blue oil test device for the main steam isolation valve of the nuclear power unit is fixedly connected to the gate;

[0020] Step 2: Apply blue oil on the gate sealing surface;

[0021] Step 3: Loosen the centering adjustment bolt and the clamping jaw locking bolt, and adjust the clamping jaw to the specified position;

[0022] Step 4: After completing the centering adjustment and installation and fixing of the device on the valve body, tighten the centering adjustment bolt and the clamping jaw locking bolt;

[0023] Step 5: Connect the two interfaces on the side of the hydraulic cylinder to the manual pump or electric pump;

[0024] Step 6: driving the piston rod to move forward, so that the gate plate fits the valve seat;

[0025] Step 7: driving the piston rod to move in the opposite direction to separate the gate plate from the valve seat;

[0026] Step 8: Move the gate out of the valve body and observe the distribution of blue oil on the gate sealing surface to judge the valve sealing performance.

[0027] Compared with the prior art, the blue oil test device and method for the main steam isolation valve of a nuclear power unit provided in this application have the following beneficial effects:

[0028] The device adopts modular design and uses hydraulic drive instead of manpower. The device has reliable clamping and has guiding and centering adjustment functions.

[0029] The device of the present application has reliable clamping and has guiding and centering adjustment functions, which solves the problem of difficulty in centering the gate by relying on manpower or manual devices during movement.

[0030] Furthermore, the device adopts a modular design, and can be equipped with clamps and connectors of different specifications according to the size of the valve and gate interface to adapt to valves of different specifications. The device adopts a modular design, and can be equipped with clamps and gate connecting rods of different specifications to adapt to valves of different calibers / strokes / gate sizes, and it is easy to disassemble and replace.

[0031] Furthermore, the present application adopts hydraulic drive instead of manual drive, which reduces labor intensity, improves work efficiency, reduces radiation dose to personnel, and saves overhaul period of nuclear power plants.

[0032] Furthermore, the present application adopts hydraulic drive instead of manual drive, which reduces the labor intensity during the test process, improves the quality of the blue oil test, and prevents the situation where the gate and the valve seat are difficult to separate due to insufficient driving force. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solution of the present application, the following is a brief introduction to the drawings required for the technical description.

[0034] Figure 1 A schematic diagram of the structure of the blue oil test device for the main steam isolation valve of a nuclear power unit provided for this application;

[0035] Figure 2 A schematic diagram of the connection between the clamping assembly and the frame provided for this application;

[0036] Figure 3 A schematic diagram of the connection between the piston rod and the gate connecting rod provided in this application;

[0037] Figure 4 Schematic diagram of the blue oil test device and valve connection of the main steam isolation valve of the nuclear power unit provided for this application;

[0038] Figure 5 A flow chart of the blue oil test method for the main steam isolation valve of a nuclear power unit provided for this application.

[0039] Description of reference numerals:

[0040] 1-Double-acting hydraulic cylinder; 2-Frame; 3-Piston rod; 4-Quick-release positioning pin; 5-Centering adjustment bolt; 6-Clamp; 7-Gate connecting rod; 8-Clamp locking bolt; 9-Gate; 10-Valve body. DETAILED DESCRIPTION

[0041] The following is further explained in detail through specific implementation methods.

[0042] like Figures 1 to 3 As shown, the present application provides a blue oil test device for the main steam isolation valve of a nuclear power unit, including a frame 2, a clamping assembly, and a driving assembly.

[0043] like Figure 1 As shown, the frame 2 adopts a beam structure, which is used to support and fix other functional modules (components) of the device. The frame 2 is arranged horizontally (horizontally), and the frame 2 is two parallel beams connected together by bolts, and the two beams are symmetrically arranged. A clamping claw 6 is installed between the two beams, and the clamping claws 6 are respectively installed at both ends of the frame 2, and the two clamping claws 6 are symmetrically arranged.

[0044] Slide grooves are provided at the connection points between the two ends of the frame 2 and the clamping jaws 6, allowing the clamping jaws 6 to slide along the slide groove direction to adapt to different valve calibers and to be used for centering adjustment. Slide grooves are provided on the inner sides of the two beams and are symmetrically arranged, with a total of 4 slide grooves.

[0045] Optionally, the beam is higher in the middle and lower at both ends.

[0046] Optionally, the two cross beams are fixed with eight symmetrically arranged bolts, with four bolts being arranged near the middle.

[0047] like Figure 2 As shown, the clamping assembly includes a clamping jaw 6, a clamping jaw locking bolt 8, and a centering adjustment bolt 5. The clamping assembly is used to achieve a fixed connection between the device and the valve, and also has a centering adjustment function.

[0048] Optionally, the jaws can be replaced to accommodate valves of different diameters.

[0049] Optionally, the clamping jaw 6 is a J-shaped structure as a whole, having a top, a middle and a bottom. The top of the clamping jaw 6 is installed in the slide groove of the frame 2, and is fixed and loosened by the clamping jaw locking bolt 8. The length of the slide groove is greater than the length of the top of the clamping jaw 6. The middle of the clamping jaw 6 serves as a transition structure. The clamping jaw 6 has a clamping portion (bottom) facing the middle of the frame 2 for clamping the concave annular surface at the top of the valve body.

[0050] The centering adjustment bolt 5 is perpendicular to the clamping jaw locking bolt 8 and is installed on the crossbeam of the frame 2, for example, arranged along the axis of the crossbeam, or arranged perpendicular to the axis of the crossbeam. Each crossbeam is provided with a centering adjustment bolt 5, and the centering adjustment bolt 5 presses against the screw of the clamping jaw locking bolt 8, so that the clamping jaw 6 can be locked when clamping the concave annular surface at the top of the valve body.

[0051] like Figure 4 As shown, the device is clamped on the concave annular surface of the top of the valve body by the clamping jaw 6, and the relative position of the clamping jaw 6 and the frame 2 is locked by the centering adjustment bolt 5 and the clamping jaw locking bolt 8. The clamping jaw 6 can slide along the slide groove on the frame 2 to adjust the position. Before adjusting the position of the clamping jaw 6, loosen the centering adjustment bolt 5 and the clamping jaw locking bolt 8. After the position adjustment is completed, tighten the centering adjustment bolt 5 and the clamping jaw locking bolt 8.

[0052] The drive assembly is connected to the gate to drive the gate to move up / down along the piston rod to achieve the fitting / separation process of the gate and the valve seat during the blue oil experiment. The gate connecting rod can be replaced to adapt to valves with different strokes / different gate specifications.

[0053] The driving assembly is connected to the gate plate 9 and is used to drive the gate plate 9 to move forward / reversely along the piston rod 3 to achieve the fitting / separation process of the gate plate 9 and the valve seat during the blue oil experiment. The driving assembly includes a double-acting hydraulic cylinder 1, a piston rod 3, a quick-release positioning pin 4, and a gate plate connecting rod 7. The hydraulic cylinder 1 is arranged above the frame 2, and the piston rod 3 is connected to the bottom of the hydraulic cylinder 1 and passes through the frame 2 to connect the gate plate connecting rod 7 below.

[0054] like Figure 3 As shown, the piston rod 3 and the gate connecting rod 7 are detachably connected by a quick-release positioning pin 4. The piston rod 3 has a groove-shaped connecting portion for receiving and matching the top of the gate connecting rod 7, that is, the top of the gate connecting rod 7 is clamped in the groove at the bottom of the piston rod 3, and the quick-release positioning pin 4 passes through the connection between the piston rod 3 and the gate connecting rod 7 and fixes them.

[0055] The driving assembly is connected to the gate through the gate connecting rod 7 (the end size structure of which is compatible with the connection interface of the gate), and the device drives the piston rod 3 to move forward / reverse through the double-acting hydraulic cylinder 1, thereby driving the gate connecting rod 7 and the gate to move.

[0056] In addition, if Figure 5 As shown, the present application provides a blue oil test method for the main steam isolation valve of a nuclear power unit, and the specific steps are as follows:

[0057] Step 1: Complete the connection and fixation between the device and the gate plate 9;

[0058] Step 2: Apply blue oil on the gate sealing surface;

[0059] Step 3: Loosen the centering adjustment bolt 5 and the clamping jaw locking bolt 8, and adjust the clamping jaw 6 to a suitable position;

[0060] Step 4: Complete the centering adjustment and installation of the device on the valve body (such as Figure 4 After that, tighten the centering adjustment bolt 5 and the clamping jaw locking bolt 8;

[0061] Step 5: Connect the two interfaces on the side of the hydraulic cylinder to the manual pump or electric pump;

[0062] Step 6: Drive the piston rod 3 to move forward, so that the gate plate 9 fits against the valve seat;

[0063] Step 7: drive the piston rod 3 to move in the opposite direction to separate the gate plate 9 from the valve seat;

[0064] Step 8: Move the gate 9 out of the valve body and observe the distribution of blue oil at the gate sealing surface to judge the valve sealing performance.

[0065] The above description is only a specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by any technician familiar with the technical field within the technical scope disclosed in the present application should be covered within the protection scope of the present application.

Claims

1. A blue oil test device for the main steam isolation valve of a nuclear power unit, characterized in that: include: A frame (2) for providing a support and fixing point; A clamping assembly is arranged at both ends of the frame (2), and the clamping assembly has a clamping claw (6) for clamping the concave annular surface at the top end of the valve body; The driving component is vertically arranged to penetrate the frame (2), and its bottom is connected to the gate plate (9) to drive the gate plate (9) to perform forward / reverse movement.

2. The blue oil test device for the main steam isolation valve of a nuclear power unit according to claim 1 is characterized in that: The frame (2) is composed of two parallel beams fixedly connected by bolts, and the two beams are symmetrically arranged.

3. The blue oil test device for the main steam isolation valve of a nuclear power unit according to claim 2 is characterized in that: A sliding groove is provided on the inner side of the crossbeam, and the clamping claw (6) is slidably mounted on the sliding groove.

4. The blue oil test device for the main steam isolation valve of a nuclear power unit according to claim 1 is characterized in that: The frame (2) is arranged horizontally.

5. The blue oil test device for the main steam isolation valve of a nuclear power unit according to claim 1 is characterized in that: The clamping jaw (6) has a top, a middle and a bottom, and the top is installed in the slide groove of the frame (2) and is connected via a clamping jaw locking bolt (8).

6. The blue oil test device for the main steam isolation valve of a nuclear power unit according to claim 5 is characterized in that: The clamping assembly further comprises a centering adjustment bolt (5), which is arranged perpendicular to the clamping jaw locking bolt (8) and is mounted on the frame (2).

7. The blue oil test device for the main steam isolation valve of a nuclear power unit according to claim 1 is characterized in that: The driving assembly comprises a double-acting hydraulic cylinder (1), a piston rod (3), and a gate connecting rod (7) which are connected in sequence from top to bottom.

8. The blue oil test device for the main steam isolation valve of a nuclear power unit according to claim 7 is characterized in that: The piston rod (3) and the gate connecting rod (7) are connected via a quick-release positioning pin (4).

9. The blue oil test device for the main steam isolation valve of a nuclear power unit according to claim 7 or 8, characterized in that: The bottom of the piston rod (3) is provided with a groove-shaped connecting portion for fitting the top of the gate connecting rod (7).

10. A method for testing the blue oil of the main steam isolation valve of a nuclear power unit, characterized in that: include: Step 1: fixedly connecting the blue oil test device for the main steam isolation valve of a nuclear power unit according to any one of claims 1 to 9 to a gate plate (9); Step 2: Apply blue oil on the gate sealing surface; Step 3: Loosen the centering adjustment bolt (5) and the clamping jaw locking bolt (8), and adjust the clamping jaw (6) to the specified position; Step 4: After completing the centering adjustment and installation and fixing of the device on the valve body, tighten the centering adjustment bolt (5) and the clamping jaw locking bolt (8); Step 5: Connect the two interfaces on the side of the hydraulic cylinder to the manual pump or electric pump; Step 6: driving the piston rod (3) to move forward, so that the gate plate (9) fits against the valve seat; Step 7: driving the piston rod (3) to move in the reverse direction, so that the gate plate (9) is separated from the valve seat; Step 8: Move the gate plate (9) out of the valve body and observe the distribution of blue oil on the gate plate sealing surface to judge the valve sealing performance.

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