Method for detecting sealing surface of nuclear main pump mechanical seal

Abstract

The invention discloses a method for detecting a sealing surface of a nuclear main pump mechanical seal, and relates to the technical field of nuclear main pump mechanical seals, a limiting mechanism comprises two transparent semicircular plates, elastic arc-shaped plates are fixedly connected to the positions, close to the tops and the bottoms, of the side walls of inner cavities of the two transparent semicircular plates, and fixing plates are fixedly connected to the front sides and the rear sides of the transparent semicircular plates. The two transparent semicircular plates are arranged on the surface of the nuclear main pump in a sleeving mode, the elastic arc-shaped plates make contact with the surface of the nuclear main pump, the transparent semicircular plates are limited through bolts, the connecting rod is moved, the connecting rod drives the inserting plate to move, the inserting plate can be inserted into the connecting position of the nuclear main pump, the inserting plate is rotated, and the fixing column abuts against the connecting position of the nuclear main pump. When the nuclear main pump is used, a certain distance is generated, the adjusting plate is moved, the adjusting plate drives the limiting plate to move, the camera at the limiting plate observes the sealing surface in the nuclear main pump, and the measuring instrument detects the flatness and roughness of the surface of the sealing surface.

Description

Technical Field

[0001] The invention relates to the technical field of nuclear main pump mechanical seals, and in particular to a sealing surface detection method for a nuclear main pump mechanical seal. Background Art

[0002] The nuclear main pump is a pump in the primary loop system of the nuclear island, used to drive the coolant to circulate in the RCP system. The main pump is located in the heart of the nuclear island and is used to pump hot water into the evaporator to convert heat energy. It is the key to controlling the water circulation in nuclear power operation. Each steam generator has a main pump. At present, the sealing surface of the mechanical seal of the nuclear main pump needs to be inspected regularly to facilitate subsequent normal use.

[0003] However, there are some problems in the detection process of the sealing surface of the existing nuclear main pump mechanical seal. The existing sealing surface detection device is not convenient for detecting multiple sealing surfaces during use, and is not convenient for detecting nuclear main pumps of different sizes, which will reduce the use range of the device. At the same time, it is not convenient to install multiple detection devices and observe the detection process inside the device. Moreover, the device occupies more space when not in use, which reduces the practicality of the device. Summary of the invention

[0004] In view of the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a sealing surface detection method for the mechanical seal of a nuclear main pump, so that multiple detection devices can be installed in a stacked manner, multiple sealing surfaces can be detected, the detection process can be observed conveniently, and nuclear main pumps of different sizes can be used for detection. The device occupies a smaller space when not in use.

[0005] To achieve the above object, the present invention provides the following technical solution: A method for detecting the sealing surface of a nuclear main pump mechanical seal, comprising the following steps:

[0006] Step 1: Put the limit mechanism on the surface of the nuclear main pump and install the limit mechanism;

[0007] Step 2: Draw a certain rectangle between the nuclear main pumps, move the detection mechanism to the inside of the nuclear main pump, and the detection mechanism detects the sealing surface inside the nuclear main pump;

[0008] Step 3: Multiple limit mechanisms are connected through the installation mechanism, and multiple sealing surfaces can be detected.

[0009] Preferably, the limiting mechanism includes two transparent semicircular plates, and elastic arc plates are fixedly connected to the side walls of the inner cavities of the two transparent semicircular plates near the top and the bottom, and fixed plates are fixedly connected to the front and back sides of the transparent semicircular plates. A first threaded hole is opened in the inner cavity of the fixing plate, and two adjacent inner cavities of the first threaded holes are threadedly connected with bolts.

[0010] Preferably, the detection mechanism includes a limit plate, the outer edge of the transparent semicircular plate is provided with three through grooves, the inner cavity of the through groove located in the middle is penetrated by a limit rod, the two limit plates are respectively located between two adjacent elastic arc plates, one end of the limit rod is fixedly connected to one side of the adjacent limit plate, the top and bottom of the limit plate are provided with grooves, the inner cavity of the groove is fixedly connected to a camera, the top and bottom of the limit plate are fixedly connected to a fixed arc plate, the outer edge of the fixed arc plate is provided with a through hole, the end of the limit rod away from the limit plate is fixedly connected to an adjustment plate, and the outer edge of the transparent semicircular plate is provided with a through hole near the top and the bottom. Connecting groove, the top and bottom of the limit plate are provided with U-shaped plates, one side of the U-shaped plate passes through the adjacent connecting groove, the front and rear sides of the inner cavity side wall of the U-shaped plate are provided with sliding grooves, the inner cavity of the U-shaped plate is provided with a measuring instrument, the front and rear sides of the measuring instrument are fixedly connected with sliders, the sliders are movably connected to the adjacent sliding groove inner cavity, the side of the measuring instrument close to the adjusting plate is fixedly connected with a movable rod, the end of the movable rod away from the measuring instrument passes through one side of the adjacent U-shaped plate and is fixedly connected with the movable plate, the side of the U-shaped plate close to the adjusting plate is fixedly connected with two L-shaped elastic plates, and the side of the L-shaped elastic plate away from the movable rod is fixedly connected to the outer edge of the transparent semicircular plate.

[0011] Preferably, connecting rods are provided through the inner cavities of the through grooves on the front and rear sides, one end of the connecting rods is fixedly connected to a fixed disk, the end of the connecting rods away from the fixed disk is fixedly connected to an insert plate, the insert plate is located between two adjacent elastic arc plates, and the front and rear sides of the insert plate are fixedly connected to fixing columns.

[0012] Preferably, the mounting mechanism comprises a plurality of connecting plates, which are respectively fixedly connected to the outer edges of adjacent transparent semicircular plates, a second threaded hole is provided on the side of the connecting plate away from the transparent semicircular plate, a limiting threaded rod is threadedly connected to the inner cavity of the second threaded hole, an L-shaped plate is inserted into the end of the limiting threaded rod away from the transparent semicircular plate, a third threaded hole is provided on the outer edge of the L-shaped plate, a connecting threaded rod is threadedly connected to the inner cavity of the third threaded hole, a turntable is fixedly connected to the end of the connecting threaded rod close to the connecting plate, and a cross plate is fixedly connected to the end of the connecting threaded rod away from the turntable.

[0013] Preferably, the side of the horizontal plate away from the transparent semicircular plate is fixedly connected with a universal wheel, the side of the horizontal plate close to the transparent semicircular plate is fixedly connected with a threaded barrel, and the inner cavity of the threaded barrel is threadedly connected with a double-threaded rod.

[0014] Preferably, a connecting elastic plate is commonly sleeved on the outer edges of the two adjustment plates, a movable plate is commonly provided on the front sides of the two transparent semicircular plates, four limiting grooves are opened in the inner cavity of the movable plate, and one side of the connecting elastic plate passes through the adjacent limiting grooves.

[0015] Preferably, the outer edges of the limiting threaded rods are fixedly connected to a plurality of rotating rods, and the outer edges of the rotating rods are sleeved with anti-slip sleeves.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] The present invention can achieve the mutual cooperation between transparent semicircular plates, measuring instruments, cameras, connecting elastic plates and other structures, so that two transparent semicircular plates can be sleeved on the surface of the nuclear main pump, the elastic arc plate will contact the surface of the nuclear main pump, the transparent semicircular plates are limited by bolts, the connecting rod is moved, the connecting rod drives the plug plate to move, the plug plate can be inserted into the connection of the nuclear main pump, the plug plate is rotated, the fixed column is pressed against the connection between the nuclear main pumps, a certain distance is generated between them, and the adjustment plate is moved, the adjustment plate drives the limit plate to move, the camera at the limit plate observes the sealing surface inside the nuclear main pump, and the measuring instrument detects the flatness and roughness of the sealing surface;

[0018] Through the mutual cooperation between the L-shaped plate, the limiting threaded rod, the universal wheel, the double-threaded rod and other structures, the limiting threaded rod can be rotated, and the limiting threaded rod drives the L-shaped plate to move. The device can be used as an independent device, and multiple devices can be assembled together for use. When used as an independent device, the universal wheel on the device is convenient for moving on the ground. When used as a combination, multiple devices are stacked together, and the distance between the devices is controlled and adjusted by the length of the double-threaded rod, ensuring that the device can detect multiple sealing surfaces. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a stereogram of the present invention;

[0020] Figure 2 This is a schematic diagram of the structure of the transparent semicircular plate component of the present invention;

[0021] Figure 3 This is a schematic diagram of the U-shaped plate structure of the component of the present invention;

[0022] Figure 4 This is a schematic diagram of the component plug-in structure of the present invention;

[0023] Figure 5 This is a schematic diagram of the structure of the limiting plate component of the present invention;

[0024] Figure 6 This is a schematic diagram of the L-shaped plate structure of the component of the present invention;

[0025] Figure 7 This is a schematic diagram of the cross plate structure of the component of the present invention;

[0026] Figure 8 This is a schematic diagram of the structure of the elastic plate connecting the components of the present invention;

[0027] Fig. 9 It is a diagram of the use of the superposition state of the device of the present invention;

[0028] Fig.10 for Figure 5 Enlarged view of point A in the middle;

[0029] Fig.11 for Figure 6 Enlarged view of point B in the middle.

[0030] Numbers in the figure: 1. transparent semicircular plate; 2. elastic arc plate; 3. bolt; 4. fixed plate; 5. connecting elastic plate; 6. movable plate; 7. U-shaped plate; 8. L-shaped elastic plate; 9. measuring instrument; 10. slider; 11. movable rod; 12. movable plate; 13. connecting rod; 14. fixed plate; 15. plug plate; 16. fixed column; 17. adjustment plate; 18. limit rod; 19. limit plate; 20. connecting plate; 21. L-shaped plate; 22. horizontal plate; 23. threaded cylinder; 24. double-threaded rod; 25. connecting threaded rod; 26. turntable; 27. universal wheel; 28. camera; 29. ​​fixed arc plate; 30. limit threaded rod; 31. rotating rod. DETAILED DESCRIPTION

[0031] See also Figure 1-5 , Figure 8 , Fig.10 The present invention provides a technical solution: a method for detecting the sealing surface of a nuclear main pump mechanical seal, comprising the following steps:

[0032] Step 1: Put the limit mechanism on the surface of the nuclear main pump and install the limit mechanism;

[0033] Step 2: Draw a certain rectangle between the nuclear main pumps, move the detection mechanism to the inside of the nuclear main pump, and the detection mechanism detects the sealing surface inside the nuclear main pump;

[0034] Step 3: Multiple limit mechanisms are connected through the installation mechanism, and multiple sealing surfaces can be detected.

[0035] The limiting mechanism includes two transparent semicircular plates 1, and the inner cavity side walls of the two transparent semicircular plates 1 are fixedly connected with elastic arc plates 2 near the top and bottom. The front and rear sides of the transparent semicircular plates 1 are fixedly connected with fixing plates 4. The inner cavity of the fixing plates 4 is provided with a first threaded hole, and the inner cavities of two adjacent first threaded holes are threadedly connected with bolts 3.

[0036] The detection mechanism includes a limit plate 19. Three through grooves are provided on the outer edge of the transparent semicircular plate 1. A limit rod 18 is penetrated through the inner cavity of the middle through groove. The two limit plates 19 are respectively located between two adjacent elastic arc plates 2. One end of the limit rod 18 is fixedly connected to one side of the adjacent limit plate 19. The top and bottom of the limit plate 19 are provided with grooves. The inner cavity of the groove is fixedly connected with a camera 28. The top and bottom of the limit plate 19 are fixedly connected with a fixed arc plate 29. The outer edge of the fixed arc plate 29 is provided with through holes. The end of the limit rod 18 away from the limit plate 19 is fixedly connected with an adjusting plate 17. The outer edge of the transparent semicircular plate 1 is provided with connecting grooves near the top and bottom. The top and bottom of the limit plate 19 are provided with U-shaped plates 7. One side of the U-shaped plate 7 penetrates the adjacent connecting grooves. The U-shaped plate 7 Slide grooves are provided on both the front and rear sides of the inner cavity side wall, a measuring instrument 9 is provided in the inner cavity of the U-shaped plate 7, and sliders 10 are fixedly connected on both the front and rear sides of the measuring instrument 9, and the sliders 10 are movably connected to the adjacent slide groove inner cavities, and the measuring instrument 9 is fixedly connected to a movable rod 11 on one side close to the adjusting plate 17, and the end of the movable rod 11 away from the measuring instrument 9 passes through one side of the adjacent U-shaped plate 7 and is fixedly connected to a movable plate 12, and the U-shaped plate 7 is fixedly connected to two L-shaped elastic plates 8 on one side close to the adjusting plate 17, and the side of the L-shaped elastic plate 8 away from the movable rod 11 is fixedly connected to the outer edge of the transparent semicircular plate 1, and the outer edges of the two adjusting plates 17 are jointly sleeved with a connecting elastic plate 5, and the front sides of the two transparent semicircular plates 1 are jointly provided with a movable plate 6, and the inner cavity of the movable plate 6 is provided with four limiting grooves, and one side of the connecting elastic plate 5 passes through the adjacent limiting grooves;

[0037] Connecting rods 13 are provided through the inner cavities of the through grooves on both sides, one end of the connecting rods 13 is fixedly connected to a fixing plate 14, and one end of the connecting rods 13 away from the fixing plate 14 is fixedly connected to an inserting plate 15, the inserting plate 15 is located between two adjacent elastic arc-shaped plates 2, and the front and rear sides of the inserting plate 15 are fixedly connected to fixing columns 16;

[0038] Put two transparent semicircular plates 1 on the surface of the nuclear main pump, the elastic arc plate 2 will contact the surface of the nuclear main pump, limit the transparent semicircular plate 1 by the bolt 3, move the connecting rod 13, the connecting rod 13 drives the plug plate 15 to move, the plug plate 15 can be inserted into the connection of the nuclear main pump, rotate the plug plate 15, press the fixed column 16 against the connection between the nuclear main pumps, create a certain distance between them, and move the adjustment plate 17, the adjustment plate 17 drives the limit plate 19 to move, the camera 28 at the limit plate 19 observes the sealing surface inside the nuclear main pump, and the measuring instrument 9 detects the flatness and roughness of the sealing surface.

[0039] For further information, please refer to Figure 1 , Figure 6-7 , Fig. 9 , Fig.11The mounting mechanism includes a plurality of connecting plates 20, which are respectively fixedly connected to the outer edges of the adjacent transparent semicircular plates 1. The connecting plates 20 are each provided with a second threaded hole on the side away from the transparent semicircular plate 1. The inner cavities of the second threaded holes are threadedly connected to the limiting threaded rods 30. The ends of the limiting threaded rods 30 away from the transparent semicircular plate 1 are each plugged with L-shaped plates 21. The outer edges of the L-shaped plates 21 are each provided with a third threaded hole. The inner cavities of the third threaded holes are each threadedly connected to the connecting threaded rods 25. The connecting threaded rods 2 The end close to the connecting plate 20 is fixedly connected with a rotating disk 26, the end of the connecting threaded rod 25 away from the rotating disk 26 is fixedly connected with the horizontal plate 22, the outer edge of the limiting threaded rod 30 is fixedly connected with a plurality of rotating rods 31, the outer edge of the rotating rod 31 is sleeved with an anti-slip sleeve, the side of the horizontal plate 22 away from the transparent semicircular plate 1 is fixedly connected with a universal wheel 27, the side of the horizontal plate 22 close to the transparent semicircular plate 1 is fixedly connected with a threaded cylinder 23, and the inner cavity of the threaded cylinder 23 is threadedly connected with a double-threaded rod 24;

[0040] By rotating the limiting threaded rod 30, the limiting threaded rod 30 drives the L-shaped plate 21 to move. The device can be used as an independent device, and multiple devices can be assembled together for use. When used as an independent device, the universal wheel 27 on the device is convenient for moving on the ground. When used as a combination, multiple devices are stacked together, and the distance between the devices is controlled and adjusted by the length of the double-threaded rod 24, ensuring that the device can detect multiple sealing surfaces.

[0041] Working principle: The device can be used as an independent device or multiple devices can be stacked together. When the device is used as an independent device, it can only detect the upper and lower sealing surfaces inside the nuclear main pump. When multiple devices are stacked together, turn the turntable 26, the turntable 26 drives the connecting threaded rod 25 to rotate, the connecting threaded rod 25 drives the cross plate 22 to rotate 180 degrees, the cross plate 22 drives the universal wheel 27 and the threaded barrel 23 to rotate respectively, and a double-threaded rod 24 is installed between two adjacent threaded barrels 23. Multiple devices are connected and used through the double-threaded rod 24. The distance between multiple devices is controlled by the length of the double-threaded rod 24, which improves the practicality of the device.

[0042] When the device is in use, the transparent semicircular plates 1 are placed on the surface of the nuclear main pump respectively, the elastic arc plate 2 contacts the surface of the nuclear main pump, the bolts 3 are taken out, the bolts 3 pass through the adjacent fixing plates 4, and the two adjacent transparent semicircular plates 1 are connected, and then the surface of the nuclear main pump is disassembled at the position of the flange connection, the upper nuclear main pump is moved upward by the lifting equipment, and the fixed plate 14 is pushed by the external equipment. The fixed plate 14 drives the plug plate 15 to move through the connecting rod 13, and the plug plate 15 will move to the gap between the nuclear main pumps, and the fixed plate 14 is rotated. The fixed plate 14 drives the plug plate 15 to rotate through the connecting rod 13, and the plug plate 15 drives the fixed column 16 to rotate. The fixed column 16 rotates 90 degrees, and one side of the fixed column 16 is pressed against the gap between the nuclear main pumps, and then the connection is pulled. The elastic plate 5 is connected to the elastic plate 5 and drives the adjustment plate 17 to move through the movable plate 6. The adjustment plate 17 drives the limit rod 18 to move. The limit rod 18 drives the limit plate 19 to move. The limit plate 19 drives the camera 28 to move. The upper and lower cameras 28 observe the sealing surface inside the nuclear main pump to observe whether there are scratches, cracks or pits on the sealing surface. When the adjustment plate 17 continues to move, the adjustment plate 17 drives the movable plate 12 to move. The movable plate 12 drives the movable rod 11 to move. The movable rod 11 drives the measuring instrument 9 to move. The measuring instrument 9 drives the slider 10 to move inside the U-shaped plate 7. The measuring instrument 9 can be replaced with an ultrasonic measuring instrument or a roughness measuring instrument according to actual needs. The measuring instrument 9 detects the surface of the sealing surface;

[0043] When the device is not needed, multiple devices can be stacked together and placed on the ground, with the universal wheels 27 touching the ground, which is convenient for moving the device and reduces the floor space of the device.

Claims

1. A method for detecting the sealing surface of a nuclear main pump mechanical seal, characterized in that: The following steps are involved: Step 1: Put the limit mechanism on the surface of the nuclear main pump and install the limit mechanism; Step 2: Draw a certain rectangle between the nuclear main pumps, move the detection mechanism to the inside of the nuclear main pump, and the detection mechanism detects the sealing surface inside the nuclear main pump; Step 3: Multiple limit mechanisms are connected through the installation mechanism, and multiple sealing surfaces can be detected.

2. The sealing surface detection method of the nuclear main pump mechanical seal according to claim 1 is characterized in that: The limiting mechanism comprises two transparent semicircular plates (1), the inner cavity side walls of the two transparent semicircular plates (1) are fixedly connected with elastic arc plates (2) near the top and the bottom, the front and rear sides of the transparent semicircular plates (1) are fixedly connected with fixing plates (4), the inner cavities of the fixing plates (4) are each provided with a first threaded hole, and the inner cavities of two adjacent first threaded holes are commonly threadedly connected with bolts (3).

3. The sealing surface detection method of the nuclear main pump mechanical seal according to claim 1 is characterized in that: The detection mechanism comprises a limit plate (19), the outer edge of the transparent semicircular plate (1) is provided with three through grooves, the inner cavity of the through groove located in the middle is penetrated by a limit rod (18), the two limit plates (19) are respectively located between two adjacent elastic arc plates (2), one end of the limit rod (18) is fixedly connected to one side of the adjacent limit plate (19), the top and bottom of the limit plate (19) are provided with grooves, the inner cavity of the groove is fixedly connected to a camera (28), the top and bottom of the limit plate (19) are fixedly connected to a fixed arc plate (29), the outer edge of the fixed arc plate (29) is provided with a through hole, the end of the limit rod (18) away from the limit plate (19) is fixedly connected to an adjustment plate (17), the outer edge of the transparent semicircular plate (1) is provided with a connecting groove near the top and the bottom, the limit plate (19) A U-shaped plate (7) is provided at the top and the bottom, one side of the U-shaped plate (7) passes through an adjacent connecting groove, and sliding grooves are provided on the front and rear sides of the inner cavity side wall of the U-shaped plate (7). A measuring instrument (9) is provided in the inner cavity of the U-shaped plate (7), and sliders (10) are fixedly connected to the front and rear sides of the measuring instrument (9), and the sliders (10) are movably connected to the adjacent sliding groove inner cavity. A movable rod (11) is fixedly connected to the side of the measuring instrument (9) close to the adjustment plate (17), and the end of the movable rod (11) away from the measuring instrument (9) passes through the adjacent side of the U-shaped plate (7) and is fixedly connected to the movable plate (12). Two L-shaped elastic plates (8) are fixedly connected to the side of the U-shaped plate (7) close to the adjustment plate (17), and the side of the L-shaped elastic plate (8) away from the movable rod (11) is fixedly connected to the outer edge of the transparent semicircular plate (1).

4. The sealing surface detection method of the nuclear main pump mechanical seal according to claim 3 is characterized in that: Connecting rods (13) are provided through the inner cavities of the through grooves at the front and rear sides, one end of the connecting rods (13) is fixedly connected to a fixing plate (14), one end of the connecting rods (13) away from the fixing plate (14) is fixedly connected to an inserting plate (15), the inserting plate (15) is located between two adjacent elastic arc plates (2), and the front and rear sides of the inserting plate (15) are fixedly connected to fixing columns (16).

5. The sealing surface detection method of the nuclear main pump mechanical seal according to claim 1 is characterized in that: The mounting mechanism comprises a plurality of connecting plates (20), wherein the plurality of connecting plates (20) are respectively fixedly connected to the outer edges of adjacent transparent semicircular plates (1); a second threaded hole is provided on a side of the connecting plate (20) away from the transparent semicircular plate (1); a limiting threaded rod (30) is threadedly connected to the inner cavity of the second threaded hole; an L-shaped plate (21) is inserted into the end of the limiting threaded rod (30) away from the transparent semicircular plate (1); a third threaded hole is provided on the outer edge of the L-shaped plate (21); a connecting threaded rod (25) is threadedly connected to the inner cavity of the third threaded hole; an end of the connecting threaded rod (25) close to the connecting plate (20) is fixedly connected to a rotating disk (26); and an end of the connecting threaded rod (25) away from the rotating disk (26) is fixedly connected to a transverse plate (22).

6. The sealing surface detection method of the nuclear main pump mechanical seal according to claim 5 is characterized in that: The side of the transverse plate (22) away from the transparent semicircular plate (1) is fixedly connected to a universal wheel (27), the side of the transverse plate (22) close to the transparent semicircular plate (1) is fixedly connected to a threaded cylinder (23), and the inner cavity of the threaded cylinder (23) is threadedly connected to a double-threaded rod (24).

7. The sealing surface detection method of the nuclear main pump mechanical seal according to claim 3 is characterized in that: The outer edges of the two adjustment plates (17) are jointly sleeved with a connecting elastic plate (5), the front sides of the two transparent semicircular plates (1) are jointly provided with a moving plate (6), the inner cavity of the moving plate (6) is provided with four limiting grooves, and one side of the connecting elastic plate (5) passes through the adjacent limiting grooves.

8. The sealing surface detection method of the nuclear main pump mechanical seal according to claim 5 is characterized in that: The outer edges of the limiting threaded rods (30) are fixedly connected to a plurality of rotating rods (31), and the outer edges of the rotating rods (31) are sleeved with anti-slip sleeves.

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