Evaporator primary side high water level blocking plate device

Abstract

The application relates to the technical field of steam generator primary side overhauling equipment, in particular to a steam generator primary side high water level blocking plate equipment which comprises a center plate and two side plates, rotating shafts are arranged on the two sides of the center plate, the two side plates are fixed on the rotating shafts respectively, a connecting assembly for fixing the side plates on the center plate is arranged on the side plates, the connecting assembly comprises a mounting sleeve fixed on the side plate, a connecting rod rotating and sliding on the mounting sleeve, a rotating rod arranged on the connecting rod and a connecting block fixed on the rotating rod, an installation assembly for installing the rotating rod on the connecting rod is arranged in the connecting rod, a connecting groove is arranged on the side surface of the center plate, a pushing spring is arranged in the mounting sleeve, one end of the pushing spring is fixed on the connecting block, and the other end of the pushing spring is fixed on the mounting sleeve. The application has the effect of improving the blocking plate splicing speed.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of steam generator primary side maintenance equipment, and particularly relates to a steam generator primary side high water level blocking plate equipment. BACKGROUND

[0002] The steam generator is a pivotal device connecting the primary loop and the secondary loop in a nuclear power device, and is one of the devices with more faults in the operation of the nuclear power device. The faults of the steam generator are mostly caused by complex mechanical vibration and corrosion, etc., and lead to rupture of heat transfer pipes or leakage at the joint of the heat transfer pipe and the tube plate. Once the heat transfer pipe has faults such as rupture or leakage, the nuclear power plant will be forced to shut down, causing huge economic losses and serious safety hazards. Therefore, periodic in-service inspection, evaluation and preventive maintenance on the primary side of the steam generator are necessary requirements for the safe and stable operation of the entire nuclear power system.

[0003] During the shutdown maintenance of the pressurized water reactor nuclear power plant, the related maintenance items on the primary side of the steam generator, such as the corrosion inspection of the inner wall of the primary side water chamber and the eddy current flaw detection of the "U" shaped pipe, all need to be performed in the water chamber under the SG head. In order to successfully complete the maintenance of the SG, the installation and removal of the blocking plate of the inlet and outlet pipes on the primary side of the SG under the head are key steps. The blocking plate mainly blocks and bears the water pressure, prevents unnecessary harm to the maintenance personnel caused by radioactive gas or liquid, ensures that the SG is not affected by the water level during the maintenance, enables the primary side maintenance and refueling of the SG to be performed simultaneously, shortens the maintenance time, and prevents the workers or foreign matters in the water chamber from falling into the primary side main pipe.

[0004] For example, the Chinese patent document with publication number CN103542225B discloses a steam generator primary side main connection pipe high water level blocking plate, which comprises two side plates and a center plate. The center plate is installed between the two side plates, and the center plate and the two side plates cooperate to form a whole circle structure. Each side plate is provided with a detection assembly. The side plate is a whole fan-shaped cavity structure. The side plate is provided with a bottom middle spoke, two bottom side spokes, two upper spokes, a flange and a baffle. The bottom middle spoke is located at the center of the bottom of the side plate. The two bottom side spokes are symmetrically located on both sides of the bottom middle spoke. The upper spoke is located at the top of the side plate. The upper spoke is located between the bottom side spoke and the bottom middle spoke. The flange is provided on the outer edge of the top of the side plate. The baffle is embedded in the sidewall of the center plate. The center plate is a long rectangular cavity structure with two arc ends. Two threaded holes, a flange, two bottom side spokes, two upper spokes, four large square holes, two bottom middle spokes, four small square holes and four clamping grooves are provided on the outer edges of the two sides of the center plate. The bottom middle spoke is located at the center of the bottom of the center plate. The two bottom side spokes are located on both sides of the bottom middle spoke. The upper spoke is located in the top of the center plate and between the bottom middle spoke and the bottom side spoke. The flange is provided on the outer edges of the two sides of the center plate. The threaded holes and the clamping grooves are provided on the flange. The small square holes are located outside the large square holes. The four small square holes and the four large square holes are symmetrically distributed on both sides of the non-circular arc along the center line of the center plate. When the device is installed, an operator enters the primary side water chamber of the steam generator. Another operator bends the sealing assembly. The center plate and the two side plates cooperate to form a whole circle structure and are embedded in the sealing assembly. The sealing assembly is composed of a sealing gasket, an air bag and a rectangular glue pressing part. The center plate is embedded in the sealing gasket. The center plate, the two side plates and the sealing assembly are embedded in the main pipe of the primary side water chamber, thereby achieving the blocking of the main pipe.

[0005] In the above related technology, when installing the blocking plate, an operator needs to enter the steam generator, then splice the center plate and the two side plates in the steam generator, fix the two side plates to the side of the steam generator with bolts after splicing, and finally embed the center plate, the two side plates and the sealing assembly into the main pipe of the primary side water chamber. However, in the splicing process, the center plate and the two side plates need to be spliced by the operator, and then the side plates are fixed to the center plate with bolts, thereby reducing the splicing efficiency of the whole blocking plate and exposing the operator to the unblocked environment for too long. SUMMARY

[0006] The present application provides a steam generator primary side high water level blocking plate device, which aims to solve the problem of long splicing time of the whole blocking plate in the related technology.

[0007] The evaporator primary side high water level blocking plate equipment provided by the application adopts the following technical scheme:

[0008] An evaporator primary side high water level blocking plate equipment comprises a center plate and two side plates, both sides of the center plate are provided with rotating shafts, the two side plates are fixed on the rotating shafts respectively, a connecting assembly for fixing the side plates on the center plate is arranged on the side plates, the connecting assembly comprises a mounting sleeve fixed on the side plate, a connecting rod rotating and sliding on the mounting sleeve, a rotating rod arranged on the connecting rod, and a connecting block fixed on the rotating rod, an installation assembly for installing the rotating rod on the connecting rod is arranged in the connecting rod, a connecting groove is arranged on the side surface of the center plate, a pushing spring is arranged in the mounting sleeve, one end of the pushing spring is fixed on the connecting block, and the other end is fixed on the mounting sleeve, the pushing spring pushes the connecting block to insert into the connecting groove, the connecting block in the connecting groove abuts against the inner wall of the connecting groove, when the connecting block is in the connecting groove, the side plate is fixed on the center plate, and when the connecting block is separated from the connecting groove, the blocking plate is in a folded state.

[0009] By adopting the above technical scheme, when the inside of the steam generator needs to be overhauled, the operator first separates the connecting block from the connecting groove, then rotates the two side plates to make the side plates rotate around the rotating shafts, the two side plates are arranged at an angle with the center plate, the whole blocking plate is folded, the operator carries the folded blocking plate into the steam generator through the inlet of the steam generator, the operator rotates the side plates, the side plates rotate reversely around the rotating shafts, the side plates are rotated to be parallel to the center plate, the connecting block corresponds to the connecting groove, the pushing spring pushes the connecting block to move into the connecting groove, the side plates are fixed on the center plate through the connecting block and the connecting groove, then the spliced blocking plate is installed on the flange ring seat on the main pipeline, thereby improving the splicing speed of the blocking plate and reducing the long exposure time of the operator in the unblocked environment.

[0010] Optionally, an abutting surface is arranged on the end surface of the mounting sleeve, the abutting surface forms a highest surface and a lowest surface on the end surface of the mounting sleeve, the highest surface and the lowest surface are connected through the inclined abutting surface, an operating rod is fixedly installed on the end of the connecting rod extending out of the mounting sleeve, the operating rod is arranged perpendicularly to the axis of the connecting rod, and the operating rod is used for abutting against the end surface of the mounting sleeve.

[0011] By adopting the above technical scheme, in the process of splicing the blocking plate, the operating rod is directly rotated, the operating rod moves from the highest surface to the lowest surface of the mounting sleeve, at this time, the pushing spring directly pushes the connecting block to move into the connecting groove, the side plate is fixed on the center plate, and the splicing process is more convenient and fast.

[0012] Optionally, the mounting assembly comprises a mounting block rotatably connected in the connecting rod and a mounting screw rod arranged on the mounting block, and a threaded groove is arranged on the end of the rotating rod away from the connecting block, and the mounting screw rod is screwed with the threaded groove on the rotating rod.

[0013] By using the above technical scheme, the threaded groove on the rotating rod is directly screwed with the mounting screw rod during the mounting process, which is more convenient and fast during assembly, and also more convenient during production.

[0014] Optionally, a torsional spring is arranged in the mounting sleeve, one end of the torsional spring is fixed on the mounting block, the other end is fixed with a sliding block, the sliding block is hexagonal, and the sliding block is slidingly connected on the connecting rod.

[0015] By using the above technical scheme, the connecting rod is driven to rotate during the rotation of the operating rod, and since the rotating rod is rotatably connected on the connecting rod, the rotating rod will not be driven to rotate during the rotation of the connecting rod, and when the operating rod moves from the lowest surface to the highest surface, the connecting rod moves outward, and simultaneously drives the mounting block, the sliding block and the rotating rod to move away from the connecting groove, and during the subsequent rotation of the side plate downward, the connecting block is facilitated to move away from the connecting groove, and after the connecting block moves away from the connecting groove, the connecting block rotates by 180 degrees, and the side surface of the connecting block abuts on the side surface of the center plate.

[0016] Optionally, a first limiting surface is arranged on the side surface of the center plate, a second limiting surface is arranged on the side surface of the side plate, and when the side plate is arranged perpendicularly to the center plate, the first abutting surface on the connecting block abuts on the side surface of the center plate, and the first limiting surface abuts on the second limiting surface.

[0017] By using the above technical scheme, since the connecting block abuts on the side surface of the center plate and the first limiting surface abuts on the second limiting surface, the position of the side plate can be limited, and in the folded state of the blocking plate, the side plate cannot swing around the rotating shaft, and the shaking of the side plate is reduced, so that the carrying process of the operator is more convenient.

[0018] Optionally, a mounting groove is arranged on the operating rod, a limiting assembly for limiting the position of the operating rod is arranged in the mounting groove, the limiting assembly comprises a limiting spring fixed in the mounting groove and a limiting block fixed on the limiting spring, and two limiting grooves are arranged on the end surface of the mounting sleeve, one limiting groove is arranged on the lowest surface, and the other limiting groove is arranged on the highest surface.

[0019] Optionally, mounting holes are arranged on the center plate and the two side plates, and fixing bolts are arranged in the mounting holes, and the fixing bolts are used to fix the center plate and the two side plates on the main pipeline.

[0020] Optionally, the blocking plate is provided with a sealing assembly for abutting with the inner wall of the flange ring seat on the main pipeline, the sealing assembly comprises a rubber ring pressed on the flange ring seat, a dry capsule and a wet capsule arranged on the rubber ring, and a lip seal ring arranged on the lower side of the rubber ring, and the side plate is provided with a blocking plate control system for inflating the dry capsule and the wet capsule.

[0021] Optionally, the fixing bolt is provided as a light bolt, a convex round washer is arranged on the light bolt, a screw is threadedly connected to the convex round washer, the convex round washer is connected to the center plate and the side plate through the screw, a sleeve is connected to the outside of the screw, the sleeve is threadedly matched with the screw, and the sleeve protrudes from the upper surface of the convex round washer.

[0022] Optionally, the upper surface of the rubber ring is adhered to the lower surfaces of the center plate and the side plate by adhesion, so that the mounting holes on the rubber ring correspond to the mounting holes on the center plate and the side plate.

[0023] In summary, the present application has at least one of the following beneficial technical effects:

[0024] 1. The operator rotates the side plate, the side plate rotates reversely around the rotating shaft, the side plate is rotated to be parallel to the center plate, the connecting block is corresponded to the connecting groove, the spring pushes the connecting block to move into the connecting groove, the side plate is fixed on the center plate through the connecting block and the connecting groove, and then the spliced blocking plate is installed on the flange ring seat on the main pipeline, so that the splicing speed of the blocking plate is improved.

[0025] 2. In the installation process of the connecting block, the threaded groove on the rotating rod is directly threadedly connected with the installation screw, so that the assembly process is more convenient and fast. SUMMARY

[0026] Figure 1 is a top view of an embodiment of the present application.

[0027] Figure 2 is a structure schematic view of a folded state of an embodiment of the present application.

[0028] Figure 3 is a sectional view of a connecting assembly of an embodiment of the present application.

[0029] Figure 4 is Figure 3 is an enlarged view of B in FIG. 8.

[0030] Figure 5 is a whole structure view of a connecting assembly of an embodiment of the present application.

[0031] Figure 6 is a structure schematic view of an installation assembly of an embodiment of the present application.

[0032] Figure 7is a first limiting surface and a second limiting surface structure diagram of the embodiment of the application.

[0033] Figure 8 is a sealing assembly sectional view of the embodiment of the application.

[0034] Figure 9 is Figure 8 is an enlarged view at A in FIG. 1.

[0035] Reference signs: 1, center plate; 11, side plate; 12, rotating shaft; 2, connecting assembly; 21, mounting sleeve; 22, connecting rod; 23, rotating rod; 24, connecting block; 25, connecting groove; 3, abutting surface; 31, highest surface; 32, lowest surface; 33, pushing spring; 34, limiting ring; 35, first limiting surface; 36, second limiting surface; 4, mounting assembly; 41, mounting block; 42, mounting screw; 43, threaded groove; 5, operating rod; 51, torsion spring; 52, sliding block; 6, limiting assembly; 61, limiting spring; 62, limiting block; 63, limiting groove; 7, fixing bolt; 71, convex round washer; 72, screw; 73, sleeve; 8, sealing assembly; 81, rubber ring; 82, dry capsule; 83, wet capsule; 84, lip seal ring. DETAILED DESCRIPTION

[0036] The following Figures 1-9 The application is further described in detail.

[0037] The embodiment of the application discloses a high water level blocking plate equipment on a primary side of an evaporator. Referring to Figures 1 to 3 The high water level blocking plate equipment on the primary side of the evaporator comprises a center plate 1 and two side plates 11, the two side plates 11 are arranged in an arc structure, rotating shafts 12 are arranged on both sides of the center plate 1, the two side plates 11 are fixed on the rotating shafts 12 and are rotationally connected to the center plate 1 through the rotating shafts 12, a connecting assembly 2 is arranged on the side plate 11 and is used for fixing the side plate 11 on the center plate 1, when an operator enters the steam generator through a narrow entrance, the side plate 11 rotates around the rotating shaft 12, the center plate 1 and the two side plates 11 are arranged at an angle, at this time, the cross section of the blocking plate is reduced, and it is convenient for the operator to take the folded blocking plate into the steam generator through the entrance of the steam generator.

[0038] Referring to Figures 1 to 3 Chambers are arranged on the center plate 1 and the side plate 11, the arrangement of the chambers can reduce the weight of the whole blocking plate, and it is convenient for the operator to take the blocking plate into the steam generator for installation. In order to improve the strength of the center plate 1 and the side plate 11, a plurality of rib plates are arranged in the chamber of the center plate 1 and the chamber of the side plate 11, and the rib plates are fixed to the center plate 1 and the side plate 11 in a welding mode.

[0039] Referring toFigures 2 to 6 The connecting assembly 2 comprises a mounting sleeve 21 fixed on the side plate 11, a connecting rod 22 rotating and sliding on the mounting sleeve 21, a rotating rod 23 arranged on the connecting rod 22, and a connecting block 24 fixed on the rotating rod 23. An abutting surface 3 is arranged on the end surface of the mounting sleeve 21. Under the action of the abutting surface 3, a highest surface 31 and a lowest surface 32 are formed on the end surface of the mounting sleeve 21. The highest surface 31 and the lowest surface 32 are connected by the inclined abutting surface 3. At this time, the highest surface 31, the lowest surface 32 and the two abutting surfaces 3 are arranged along the mounting sleeve 21. A connecting groove 25 is arranged on the side surface of the center plate 1. When the connecting block 24 is in the connecting groove 25, the side plate 11 is fixed on the center plate 1.

[0040] In the embodiment, the connecting block 24 is arranged in a rectangular structure, and the rotating rod 23 is arranged at a non-central position of the connecting block 24. The distance between one side surface of the connecting block 24 and the axis of the rotating rod 23 is greater than the distance between the other side surface of the connecting block 24 and the axis of the rotating rod 23. In this case, the side surface of the connecting block 24 far from the axis of the rotating rod 23 is defined as the first abutting surface, and the side surface of the connecting block 24 close to the axis of the rotating rod 23 is defined as the second abutting surface. When the connecting block 24 is in the connecting groove 25, the first abutting surface on the connecting block 24 is above, and the second abutting surface is below.

[0041] Referring to Figures 2 to 6 A pushing spring 33 is arranged in the mounting sleeve 21. One end of the pushing spring 33 is fixed on the connecting block 24, and the other end is fixed on the mounting sleeve 21. The pushing spring 33 pushes the connecting block 24 to insert into the connecting groove 25, so that the connecting block 24 in the connecting groove 25 abuts against the inner wall of the connecting groove 25. Under the action of the pushing spring 33, the connecting strength of the center plate 1 and the side plate 11 is improved. In the embodiment, two connecting assemblies 2 are arranged on each side plate 11, and two connecting grooves 25 are arranged on the same side of the center plate 1. Through the arrangement of the two connecting assemblies 2, the connection between the center plate 1 and the side plate 11 is more stable.

[0042] The connecting rod 22 is arranged in a hollow structure, and both ends of the connecting rod 22 are arranged as openings. A limiting ring 34 is arranged on the side of the connecting rod 22 close to the center plate 1. An installation assembly 4 is arranged in the connecting rod 22. The installation assembly 4 is used to install the rotating rod 23 on the connecting rod 22. Then the rotating rod 23 can be moved in the moving process of the connecting rod 22, and the rotating rod 23 cannot be rotated in the rotating process of the connecting rod 22.

[0043] Referring to Figures 2 to 6The mounting assembly 4 comprises a mounting block 41 arranged in the connecting rod 22 and a mounting screw 42 arranged on the mounting block 41, and a threaded groove 43 is arranged at the end of the rotating rod 23 away from the connecting block 24, the mounting screw 42 extends out of the limiting ring 34, and when the mounting screw 42 is completely screwed with the threaded groove 43, the rotating rod 23 is arranged on both sides of the limiting ring 34 with the mounting block 41, and the rotating rod 23 and the mounting block 41 rotate on the mounting sleeve 21, and the threaded groove 43 and the mounting screw 42 can facilitate the mounting of the rotating rod 23 on the mounting sleeve 21.

[0044] With reference to Figures 2 to 6 The end of the connecting rod 22 extending out of the mounting sleeve 21 is fixedly mounted with an operating rod 5, the operating rod 5 is arranged perpendicularly to the axis of the connecting rod 22, and when the push spring 33 pushes the connecting block 24 to be completely in the connecting groove 25, the operating rod 5 abuts against the lowest face 32 on the mounting sleeve 21, and when the side plate 11 is arranged at an angle to the center plate 1, the operating rod 5 abuts against the highest face 31, at this time, the connecting block 24 is separated from the connecting groove 25, and the push spring 33 is in a compressed state.

[0045] With reference to Figures 2 to 6 A torsion spring 51 is arranged in the mounting sleeve 21, one end of the torsion spring 51 is fixed to the mounting block 41, the other end is fixed with a sliding block 52, the sliding block 52 is hexagonal, the sliding block 52 is slidingly connected in the connecting rod 22, then in the mounting process, the sliding block 52, the mounting block 41 and the torsion spring 51 are put into the connecting rod 22 from the opening of the connecting rod 22 away from the rotating rod 23, the mounting screw 42 extends out of the limiting ring 34, finally the threaded groove 43 on the rotating rod 23 corresponds to the mounting screw 42, and the rotating rod 23 is screwed on the mounting screw 42, at this time, the mounting block 41 and the rotating rod 23 are arranged on both sides of the limiting ring 34, and the rotating rod 23 and the mounting block 41 rotate on the mounting sleeve 21.

[0046] In the process of rotating the operating rod 5 from the lowest face 32 to the highest face 31, under the action of the abutting face 3, the connecting block 24 is driven to move away from the connecting groove 25, in the process of rotating the mounting sleeve 21, the connecting block 24 slides in the connecting groove 25, at this time, the torsion spring 51 is charged, then after the connecting block 24 is separated from the connecting groove 25, under the action of the torsion spring 51, the rotating rod 23 and the connecting block 24 are rotated by 180 degrees, the side plate 11 rotates by 180 degrees around the rotating shaft 12, at this time, the side plate 11 and the center plate 1 are in a folded structure, and the first abutting face on the connecting block 24 abuts against the side face of the center plate 1.

[0047] With reference to Figures 2 to 7The first limiting surface 35 is arranged on the side of the center plate 1, and the second limiting surface 36 is arranged on the side of the side plate 11; when the side plate 11 is arranged perpendicularly to the center plate 1, the first abutting surface on the connecting block 24 abuts against the side of the center plate 1, and the first limiting surface 35 abuts against the second limiting surface 36; since the first abutting surface on the connecting block 24 abuts against the side of the center plate 1, the side plate 11 cannot be rotated upward, and since the first limiting surface 35 abuts against the second limiting surface 36, the side plate 11 cannot be rotated downward, thereby limiting the side plate 11, reducing the shaking of the side plate 11 on the center plate 1 during the process that the operator carries the blocking plate into the steam generator, and facilitating the operator to carry the blocking plate into the steam generator.

[0048] With reference to Figures 2 to 7 A mounting groove is formed in the operating rod 5, and a limiting assembly 6 is arranged in the mounting groove; the limiting assembly 6 is used for limiting the position of the operating rod 5, and comprises a limiting spring 61 fixed in the mounting groove and a limiting block 62 fixed on the limiting spring 61; meanwhile, two limiting grooves 63 are arranged on the end face of the mounting sleeve 21; one limiting groove 63 is arranged on the lowest face 32, and the other limiting groove 63 is arranged on the highest face 31; when the operating rod 5 is rotated, the limiting block 62 is separated from the limiting groove 63, and then moves into the limiting groove 63 under the action of the limiting spring 61 when corresponding to the other limiting groove 63, thereby fixing the position of the operating rod 5; in the embodiment, the end of the limiting block 62 away from the limiting spring 61 is arranged as an arc face, thereby facilitating the operating rod 5 to separate the limiting block 62 from the limiting groove 63.

[0049] With reference to Figure 3 , Figure 8 and Figure 9 Mounting holes are arranged on the center plate 1 and the two side plates 11, and fixing bolts 7 are arranged in the mounting holes; the fixing bolts 7 are used for fixing the center plate 1 and the two side plates 11 on the main pipeline; in order to improve the sealing performance of the blocking plate on the opening of the main pipeline, a sealing assembly 8 is arranged on the blocking plate; the sealing assembly 8 is used for abutting against the inner wall of the flange ring seat of the main pipeline; the sealing assembly 8 comprises a rubber ring 81 pressed on the flange ring seat, a dry capsule 82 and a wet capsule 83 arranged on the rubber ring 81, and a lip seal ring 84 arranged on the lower side face of the rubber ring 81; a blocking plate control system is arranged on the side plate 11 and is used for inflating the dry capsule 82 and the wet capsule 83.

[0050] Since the side plate 11 is rotationally connected to the center plate 1, and the sealing assembly 8 is also made of flexible material, the upper surface of the rubber ring 81 can be adhered to the lower surface of the side plate 11 and the center plate 1 by adhesion, so that the mounting holes on the rubber ring 81 correspond to the mounting holes on the center plate 1 and the side plate 11. Then, when the two side plates 11 are fixed to the center plate 1, the rubber ring 81, the dry capsule 82 and the wet capsule 83 can be unfolded, and the position of the mounting holes on the rubber ring 81 does not need to be adjusted. Then, the fixing bolt 7 is directly inserted into the mounting holes and is screwed with the threaded holes on the flange ring seat, so that the fixing of the blanking plate is realized. After the blanking plate is completed, the blanking plate control system fills air into the dry capsule 82 and the wet capsule 83, so that the outer sides of the dry capsule 82 and the wet capsule 83 abut against the inner wall of the flange ring seat.

[0051] After the dry capsule 82 and the wet capsule 83 are installed in place, the lower edge of the lip seal ring 84 abuts against the surface of the flange ring seat. If the dry capsule 82 and the wet capsule 83 fail and water leaks into the lip seal cavity, the water pressure will press the lower edge of the lip seal ring 84 towards the surface of the flange ring seat. The greater the water pressure, the tighter the abutment, so as to reduce the leakage.

[0052] After the equipment is installed, the blanking plate control system fills air into the dry capsule 82 and the wet capsule 83 after adjusting the pressure through the pressure regulating valve (the currently designed working pressure is 0.42Mpa-0.45Mpa, and the actual working pressure needs to be finally confirmed through test). After being filled with air, the inner sides of the dry capsule 82 and the wet capsule 83 are supported by the blanking plate, and the outer sides are deformed to tightly abut against the inner wall of the flange ring seat to form double sealing. At the same time, the area between the dry capsule 82 and the wet capsule 83 forms a separate closed cavity under the pressure of the air capsule. The closed cavity is provided with a certain pressure (the currently designed working pressure is 0.1Mpa-0.12Mpa, and the actual working pressure needs to be finally confirmed through test) through the air supply system. If the lower dry capsule 82 and the wet capsule 83 are broken by water pressure, the closed cavity on the ring surface will be damaged. At this time, the pressure and flow of the air supply pipeline will change, and the changes of the pressure and flow of the pipeline are converted into electric signals to produce sound and light alarm, so as to achieve the purpose of leakage alarm.

[0053] In the embodiment, the fixing bolt 7 is provided as a lighted bolt, a convex round washer 71 is provided on the lighted bolt, a screw 72 is threadedly connected to the convex round washer 71, the convex round washer 71 is connected to the blanking plate through the screw 72, a sleeve 73 is connected to the outer side of the screw 72, and the sleeve 73 threadedly cooperates with the screw 72. The sleeve 73 protrudes from the upper surface of the convex round washer 71, so that the convex round washer 71 still has a certain movement allowance under the condition that the screw 72 is tightened, and the convex round washer 71 will not be fixed on the blanking plate, so as to facilitate the position adjustment of the lighted bolt.

[0054] The bolt with light is provided with an indicating assembly (belonging to the prior art), the indicating light assembly comprising an LED light, an O-ring, a battery, a spring, a housing and a button; the button is located at the bottom of the housing and interacts with the housing through the spring, the button can slide in the housing under pressure, the spring is on the top of the battery, the button slides upward after being pressed, and the spring is squeezed, when the pressure of the spring is greater than the weight of the battery, the battery is pushed to move upward and contact with the LED, so as to trigger the LED to emit light. Therefore, during the screwing-in process of the bolt with light, the bottom surface of the bolt head contacts the surface of the convex round gasket 71 and squeezes the button to move upward, the button drives the battery to move upward, and when the bolt is installed in place, the LED light is connected and emits light to prompt the operator that the bolt with light is installed.

[0055] The bolt head is left with a standard external hexagonal interface in the form of a form to facilitate the operator to use the torque wrench to tighten and remove the bolt. Whether to use the torque wrench to tighten and the specific tightening torque need to be determined according to the test situation.

[0056] The blanking plate control system takes the gas source on the site of the nuclear power plant as the main working gas source, and takes a small air compressor as a backup gas source; compressed air is filtered and pressure-regulated in the main gas path, and reaches 6 gas path branches. Each 3 branches correspond to a set of gas chambers of the blanking plate equipment, which are respectively dry chamber, annular chamber and wet chamber.

[0057] The compressed air is pressure-regulated through each branch and reaches the dry capsule 82 and the wet capsule 83 on the blanking plate through the air pipe, so that the dry capsule 82 and the wet capsule 83 are inflated and deformed, and are tightly attached to the inner wall surface of the main pipeline, thereby realizing sealing. The wet capsule 83 of the wet chamber is used for sealing, the dry capsule 82 of the dry chamber is a backup seal, and the annular chamber is mainly used for monitoring the equipment. The monitoring of the equipment mainly includes monitoring of the pressure of the main gas path, monitoring of the pressure and flow of each branch.

[0058] Main gas path pressure monitoring: a pressure switch is arranged on the main gas path to monitor the pressure of the gas supply pipeline. When the blanking plate equipment is working, if the pressure value is lower than the pre-set range, the pressure switch changes the initial state, triggers the alarm device, and generates an alarm.

[0059] Each branch pressure monitoring: pressure switches and flow switches are arranged on each branch to monitor the pressure and flow changes of each branch in real time, and an alarm will be generated when the branch pressure or flow exceeds or is lower than the set range. Among them, the pressure switches and flow switches arranged on the dry chamber and wet chamber branches are used for checking the alarm of large flow and low pressure; and the flow switches and pressure switches arranged on the annular branch are used for the alarm of large flow and high pressure of the branch. The pressure and flow data of each gas supply pipeline can be displayed on the blanking plate control terminal, which provides a basis for checking the reasons for system failure for the staff after the alarm.

[0060] In order to ensure that each gas chamber of the blocking plate can reach the required working pressure, a pressure regulating valve is arranged on each gas supply branch; in order to ensure that the blocking plate equipment can still be normally sealed in a short time after the external air source and power supply are powered off, the compressed air flow direction is limited in the blocking plate system, which can effectively prevent accidents.

[0061] The implementation principle of the high water level blocking plate equipment of the evaporator primary side in the embodiment of the application is as follows: when the opening of the main pipe in the steam generator is blocked, the operator needs to rotate the operating rod 5 in the direction from the lowest surface 32 to the highest surface 31 of the mounting sleeve 21, and the rotating rod 23 and the mounting block 41 rotate on the mounting sleeve 21; in the process of rotating the operating rod 5 from the lowest surface 32 to the highest surface 31, the connecting block 24 is driven to move away from the connecting groove 25 under the action of the abutting surface 3; in the process of rotating the mounting sleeve 21, the connecting block 24 slides in the connecting groove 25, at this time, the torsional spring 51 is charged; after the connecting block 24 is separated from the connecting groove 25, the connecting block 24 and the rotating rod 23 are rotated by 180 degrees under the action of the torsional spring 51; the side plate 11 rotates by 90 degrees around the rotating shaft 12, at this time, the side plate 11 and the center form a folded structure, the first abutting surface on the connecting block 24 abuts on the side surface of the center plate 1, the side plate 11 cannot be rotated downward due to the abutment of the first limiting surface 35 and the second limiting surface 36, and the side plate 11 is limited, and then the center plate 1 and the side plate 11 form a folded structure, which is convenient for the operator to bring the folded blocking plate into the steam generator.

[0062] After the folded blocking plate is brought into the steam generator by the operator, the operator rotates the operating rod 5 in the direction from the highest surface 31 to the lowest surface 32, the connecting block 24 is reset under the action of the torsional spring 51, and then the two side plates 11 are rotated, the connecting block 24 is pushed into the connecting groove 25 under the action of the pushing spring 33, and then the folded sealing assembly 8 is also unfolded and sleeved on the assembled blocking plate, so that the assembly efficiency of the blocking plate can be improved and the exposure time of personnel in the unblocked environment can be reduced.

[0063] After the blocking plate is assembled, the lighted bolt corresponds to the threaded hole on the flange ring seat, the lighted bolt is directly rotated, the button is slid upward after being pressed, and the spring is extruded, when the spring pressure is greater than the weight of the battery, the battery is pushed upward and contacts the LED, so that the LED is triggered to emit light, and the installation of the corresponding lighted bolt is prompted, after all the lighted bolts are installed, the blocking plate control system adjusts the pressure through the pressure regulating valve, and then the dry capsule 82 and the wet capsule 83 are filled with pressure air, after being inflated, the inside of the dry capsule 82 and the wet capsule 83 is supported by the blocking plate, the outside is deformed and tightly attached to the inner wall of the flange ring seat to form a double seal, and the blocking plate and the inner wall of the flange ring seat are sealed.

[0064] The above are all preferred embodiments of the present application, and do not limit the protection scope of the present application, so that: all equivalent changes made according to the structure, shape, principle of the present application should be covered in the protection scope of the present application.

Claims

1. A high water level baffle device for the primary side of an evaporator comprising a center plate and two side plates, characterized in that: Both sides of the center plate are provided with rotating shafts, two side plates are fixed on the rotating shafts respectively, the side plates are provided with connecting assemblies for fixing the side plates on the center plate, the connecting assembly comprises a mounting sleeve fixed on the side plate, a connecting rod rotating and sliding on the mounting sleeve and a rotating rod provided on the connecting rod and a connecting block fixed on the rotating rod, the connecting rod is provided with a mounting assembly for mounting the rotating rod on the connecting rod, the side surface of the center plate is provided with a connecting groove, the mounting sleeve is provided with a pushing spring, one end of the pushing spring is fixed on the connecting block and the other end is fixed on the mounting sleeve, the pushing spring pushes the connecting block to insert into the connecting groove, the connecting block in the connecting groove abuts against the inner wall of the connecting groove, when the connecting block is in the connecting groove, the side plate is fixed on the center plate, when the connecting block is separated from the connecting groove, the side plate is in the folded state; The mounting sleeve is provided with a torsion spring, one end of the torsion spring is fixed on the mounting block and the other end is fixed with a sliding block, the sliding block is hexagonal, and the sliding block is slidingly connected to the connecting rod. The side surface of the center plate is provided with a first limiting surface, the side surface of the side plate is provided with a second limiting surface, when the side plate is perpendicular to the center plate, the first abutting surface on the connecting block abuts against the side surface of the center plate, and the first limiting surface abuts against the second limiting surface.

2. The high water level blocking plate equipment for primary side of an evaporator according to claim 1, characterized in that: The end surface of the mounting sleeve is provided with an abutting surface, the abutting surface forms a highest surface and a lowest surface on the end surface of the mounting sleeve, the highest surface and the lowest surface are connected by the inclined abutting surface, one end of the connecting rod extending out of the mounting sleeve is fixedly provided with an operating rod, the operating rod is perpendicular to the axis of the connecting rod, and the operating rod is used for abutting against the end surface of the mounting sleeve.

3. The high water level blocking plate apparatus for primary side of an evaporator according to claim 1, characterized in that: The mounting assembly comprises a mounting block rotatingly connected in the connecting rod and a mounting screw provided on the mounting block, and a threaded groove is formed on the end of the rotating rod away from the connecting block, and the mounting screw is threadedly connected with the threaded groove on the rotating rod.

4. The high water level blocking plate apparatus for primary side of an evaporator according to claim 2, characterized in that: An installation groove is formed in the operating rod, a limiting assembly for limiting the position of the operating rod is arranged in the installation groove, the limiting assembly comprises a limiting spring fixed in the installation groove and a limiting block fixed on the limiting spring, and two limiting grooves are formed on the end surface of the mounting sleeve, one limiting groove is formed on the lowest surface, and the other limiting groove is formed on the highest surface.

5. The high water level blocking plate apparatus for primary side of an evaporator according to claim 1, characterized in that: Mounting holes are formed in the center plate and the two side plates, and fixing bolts are arranged in the mounting holes, and the fixing bolts are used for fixing the center plate and the two side plates on the flange ring seat of the main pipeline.

6. The high water level blocking plate apparatus for primary side of an evaporator according to claim 1, characterized in that: A sealing assembly for abutting against the inner wall of the flange ring seat of the main pipeline is arranged on the center plate, the sealing assembly comprises a rubber ring tightly arranged on the flange ring seat, a dry capsule and a wet capsule arranged on the rubber ring, and a lip seal ring arranged on the lower side surface of the rubber ring, and a blocking plate control system for inflating the dry capsule and the wet capsule is arranged on the side plate.

7. A high water level baffle apparatus for the primary side of an evaporator as defined in claim 5, wherein: The fixing bolt is provided with a lamp bolt, a convex round washer is arranged on the lamp bolt, a screw is threadedly connected to the convex round washer, the convex round washer is connected to the center plate and the side plate through the screw, a sleeve is connected to the outside of the screw, the sleeve is threadedly matched with the screw, and the sleeve protrudes from the upper surface of the convex round washer.

8. A high water level baffle apparatus for the primary side of an evaporator as defined in claim 6, wherein: The upper surface of the rubber ring is adhered to the lower surfaces of the center plate and the side plate by adhesion, so that the mounting hole on the rubber ring corresponds to the mounting holes on the center plate and the side plate.

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