A special device for disassembling and assembling a sodium-cooled fast reactor core flowmeter and its use method

Abstract

The present invention discloses a special device for disassembling and assembling a sodium-cooled fast reactor core flowmeter and a method for using the device. The device comprises an outer cylinder, wherein the interior of the outer cylinder is configured to be hollow, an adjusting cylinder is fixedly connected to the bottom of the outer cylinder, a support seat is fixedly connected to the bottom of the adjusting cylinder, and a lifting structure is provided on the top of the outer cylinder. The lifting structures are interconnected by a connecting assembly, and the lifting structure can drive the sodium-cooled fast reactor core flowmeter to vertically rise and fall within the outer cylinder, the adjusting cylinder, and the support seat through the connecting assembly. The present invention lifts and assembles the sodium-cooled fast reactor core flowmeter by automatic lifting, which can greatly improve the safety of the loading and unloading of the sodium-cooled fast reactor core flowmeter, making the installation of the sodium-cooled fast reactor core flowmeter more flexible, and can be adjusted according to the actual situation on site, reducing the difficulty and cost of installation, and using intelligent lifting to make the lifting process safer.

Description

Technical Field

[0001] The invention relates to the technical field of disassembly and assembly of a core flowmeter for a sodium-cooled fast reactor, and in particular to a special device for disassembly and assembly of a core flowmeter for a sodium-cooled fast reactor and a use method thereof. Background Art

[0002] A sodium-cooled fast reactor core flowmeter, especially a permanent magnet type pipeline sodium-cooled fast reactor core flowmeter, is a device specifically used to measure the sodium flow in a pipeline. The permanent magnet type pipeline sodium-cooled fast reactor core flowmeter operates based on Faraday's law of electromagnetic induction. When liquid sodium flows in a sodium pipeline perpendicular to the magnetic field, it cuts the magnetic lines of force, thereby generating an induced electromotive force on two electrodes perpendicular to the direction of sodium movement and the direction of the magnetic lines of force. This induced electromotive force is proportional to the flow rate of sodium and can be used to calculate the volume flow rate of sodium.

[0003] Existing sodium-cooled fast reactor core flowmeters are mainly disassembled and assembled manually. The installation space of the sodium-cooled fast reactor core flowmeter is limited, such as compact pipeline layout and small space. This greatly increases the difficulty and risk of disassembling and assembling the sodium-cooled fast reactor core flowmeter. In addition, liquid sodium at high temperature is prone to form dosed sodium aerosols, which are harmful to human body if inhaled, so sealing operation is required.

[0004] Therefore, it is necessary to design and create a special device for disassembling and assembling a sodium-cooled fast reactor core flowmeter and a method for using the same. Summary of the Invention

[0005] In order to solve the problems raised in the above-mentioned background technology, the purpose of the present invention is to provide a special device for disassembling and assembling a sodium-cooled fast reactor core flowmeter and a method for using the same, which has the advantage of facilitating the disassembly and assembly of the sodium-cooled fast reactor core flowmeter, and solves the problem that the sodium-cooled fast reactor core flowmeter is mainly disassembled by manual disassembly and assembly, and the installation space of the sodium-cooled fast reactor core flowmeter is limited, such as the compact pipeline layout and the small space, which greatly increases the difficulty and risk of disassembling and assembling the sodium-cooled fast reactor core flowmeter. In addition, sodium itself has a certain corrosiveness, which can easily cause personal injury to the operator.

[0006] To achieve the above-mentioned object, the present invention provides the following technical solutions: a special device for disassembling and assembling a core flowmeter for a sodium-cooled fast reactor and a method for using the same, comprising an outer cylinder;

[0007] The interior of the outer tube is configured to be hollow, an adjusting tube is fixedly connected to the bottom of the outer tube, a support seat is fixedly connected to the bottom of the adjusting tube, a hoisting structure is provided at the top of the outer tube, a sodium-cooled fast reactor core flowmeter is provided inside the outer tube, the sodium-cooled fast reactor core flowmeter and the hoisting structure are connected to each other through a connecting assembly, and the hoisting structure can drive the sodium-cooled fast reactor core flowmeter to rise and fall vertically inside the outer tube, the adjusting tube and the support seat through the connecting assembly, an exhaust pipe is connected to the top of the right side of the outer tube, and a pressure maintaining structure surrounding the surface of the sodium-cooled fast reactor core flowmeter is provided inside the outer tube.

[0008] As a preferred embodiment of the present invention, the hoisting structure includes a winch fixedly connected to the top of the outer cylinder, a steel cable is wound around the surface of the winch, the steel cable extends to the inside of the outer cylinder away from the side of the winch and is interconnected with the connecting assembly, the top of the outer cylinder is fixedly connected to a bearing support pressure bracket, the bearing support pressure bracket is sleeved on the surface of the output end of the winch, and a weighing module is provided at the bottom of the bearing support pressure bracket, which can measure the hoisting load-bearing weight of the winch.

[0009] As a preferred embodiment of the present invention, the connecting assembly includes a connecting long tube slidably connected to the inside of the outer tube, the bottom of the connecting long tube is fixedly connected to a connecting flange, the bottom of the connecting flange is interconnected with the top of the sodium-cooled fast reactor core flowmeter, the top of the connecting long tube is fixedly connected to a counterweight chain, the top of the counterweight chain is fixedly connected to a movable pulley group, and the top of the movable pulley group is fixedly connected to the bottom of the steel cable.

[0010] As a preferred embodiment of the present invention, the pressure maintaining structure includes a D-shaped cylinder connected to the surface of the outer cylinder, and the right sides of the two D-shaped cylinders are connected to an inflation valve. The interior of the D-shaped cylinder is fixedly connected to a flip shaft, and the surface of the flip shaft is sleeved with a sealing pressure plate, and the outer surface of the sealing pressure plate can contact the inner wall of the D-shaped cylinder.

[0011] As a preferred embodiment of the present invention, a flange-fixed observation window is provided on the surface of the connecting long cylinder, and a sealing observation window corresponding to the sealing pressure plate is connected to the surface of the outer cylinder.

[0012] As a preferred embodiment of the present invention, the left side of the D-shaped cylinder is threadedly connected to a pressure plate pin, the right end of the pressure plate pin passes through the outer cylinder and extends to the top of the sealing pressure plate, and the surface of the D-shaped cylinder is connected to a spare inflation hole located at the top of the pressure plate pin.

[0013] As a preferred embodiment of the present invention, the surface of the adjusting cylinder is connected to a plurality of sight glasses, the outer surface of the adjusting cylinder is surrounded by an adjusting rod, the end of the adjusting rod close to the adjusting cylinder passes through the adjusting cylinder and extends to the interior of the adjusting cylinder, the adjusting rod is threadedly connected to the adjusting cylinder, and the inner end of the adjusting rod can contact the surface of the sodium-cooled fast reactor core flowmeter.

[0014] A special device for disassembling and assembling a core flowmeter of a sodium-cooled fast reactor and a method for using the same include the following steps:

[0015] S1: Use the hoist to move the outer cylinder to the top of the sodium-cooled fast reactor core flowmeter. The winch releases the steel cable, allowing the steel cable to move downward with the connecting long cylinder using the movable pulley set. When the connecting long cylinder moves to the top of the sodium-cooled fast reactor core flowmeter, the connecting long cylinder and the sodium-cooled fast reactor core flowmeter are connected using the connecting flange. After the connection is completed, the winch is started in the reverse direction. The winch reels the steel cable and uses the connecting long cylinder to pull the sodium-cooled fast reactor core flowmeter vertically upward, so that the sodium-cooled fast reactor core flowmeter is completely moved into the outer cylinder and located on the top of the sealing plate.

[0016] S2: The sealing pressure plate is rotated around the turning axis. When the outer surface of the sealing pressure plate contacts the inner wall of the outer cylinder and the outer cylinder is divided and sealed, gas is injected into the inner part of the outer cylinder through the inflation valve to maintain a certain air pressure inside the outer cylinder.

[0017] S3: When the internal air pressure of the outer cylinder is consistent with the external ambient air pressure, fix the regulating cylinder and the support base to the bottom of the outer cylinder, then hoist the outer cylinder together with the support base to the top of the flow meter installation hole and connect the support base to the device with the threaded assembly;

[0018] S4: When the two are connected, the sealing pressure plate is opened, and part of the argon gas inside the outer cylinder is replaced with the gas inside the device to keep the internal pressure of the outer cylinder consistent with that of the device. When the replacement is completed, the sodium-cooled fast reactor core flowmeter is slowly lowered by a winch. When the sodium-cooled fast reactor core flowmeter is stuck, the weight value of the weighing module decreases and the system stops. The offset condition is observed by adjusting the sight glass on the surface of the cylinder and the adjustment rod on the surface of the cylinder is used to squeeze the sodium-cooled fast reactor core flowmeter for displacement. After adjustment and alignment, the cylinder is lowered again until it is in place.

[0019] S5: Loosen the connection between the adjusting tube and the support seat, continue to lower the steel cable to the set length, and then slowly lift the lifting device so that the user can remove the connecting bolts between the connecting long tube and the sodium-cooled fast reactor core flowmeter. When the connecting long tube and the sodium-cooled fast reactor core flowmeter are disconnected, retract the connecting long tube into the inner part of the outer tube, thereby completing the disassembly and assembly of the sodium-cooled fast reactor core flowmeter.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. The present invention lifts and loads the sodium-cooled fast reactor core flowmeter by automatic lifting, which can greatly improve the loading and unloading safety of the sodium-cooled fast reactor core flowmeter, make the installation of the sodium-cooled fast reactor core flowmeter more flexible, and can be adjusted according to the actual situation on site, reducing the difficulty and cost of installation. The use of vertical lifting helps to make the sensor lining wear evenly and extend the service life.

[0022] 2. When the dedicated device for the sodium-cooled fast reactor core flowmeter of the present invention is removed, the pressure maintaining structures can be opened and closed respectively to reduce the risk of sodium leakage.

[0023] 3. The present invention provides a sealing observation window and a flange fixing observation window on the surface of the outer cylinder, so that the installation status of the sealing pressure plate and the flange can be viewed.

[0024] 4. The present invention provides an adjustment cylinder, which can use special tools to solve the problem of jamming or obstruction during lifting, so that the flow meter can be pushed to correct under the condition of argon pressure maintenance. At the same time, in order to make its operation accurate and fast, a sight glass is installed at the best viewing angle.

[0025] 5. The present invention can ensure that the wire rope is in a stretched state and prevent the wire rope from twisting by providing a movable pulley block and a connecting structure.

[0026] 6. The present invention installs a counterweight chain to keep the movable pulley block and the structural connecting member in a certain state without twisting, and installs a limiting roller to keep the movable pulley block and the structural connecting member in the center of the inner wall of the cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the structure of the present invention;

[0028] Figure 2 This is a schematic cross-sectional view of the main structure of the present invention;

[0029] Figure 3 This is a cross-sectional schematic diagram of the main structure of the present invention in a hoisting state;

[0030] Figure 4 It is a schematic cross-sectional view of the local structure of the present invention.

[0031] In the figure: 1. Outer cylinder; 2. Adjusting cylinder; 3. Support seat; 4. Hoisting structure; 5. Sodium-cooled fast reactor core flowmeter; 6. Exhaust pipe; 7. Pressure maintaining structure a; 8. Winch; 9. Steel cable; 10. Bearing support pressure bracket; 11. Weighing module; 12. Connecting long cylinder; 13. Roller; 14. Connecting flange; 15. Counterweight chain; 16. Movable pulley block; 17. Inflating valve; 18. Turning shaft a; 19. Sealing pressure plate a; 20. Flange-fixed observation window; 21. Sealing observation window; 22. Pressure plate pin; 23. Spare inflation hole; 24. Sight glass; 25. Adjusting rod; 26. D-shaped cylinder a; 27. D-shaped cylinder b; 28. Sealing pressure plate b; 29. ​​Pressure maintaining structure b; 30. Turning shaft b. DETAILED DESCRIPTION

[0032] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0033] like Figures 1 to 4 As shown, the present invention provides a special device for disassembling and assembling a core flowmeter for a sodium-cooled fast reactor and a method for using the same, comprising an outer cylinder 1;

[0034] The interior of the outer tube 1 is configured to be hollow, the bottom of the outer tube 1 is fixedly connected to an adjusting tube 2, the bottom of the adjusting tube 2 is fixedly connected to a support seat 3, the top of the outer tube 1 is provided with a lifting structure 4, and the interior of the outer tube 1 is provided with lifting structures 4 that are interconnected through connecting components. The lifting structure 4 can drive the sodium-cooled fast reactor core flowmeter 5 to rise and fall vertically inside the outer tube 1, the adjusting tube 2 and the support seat 3 through the connecting components. The top of the right side of the outer tube 1 is connected to an exhaust pipe 6, and the interior of the outer tube 1 is provided with a pressure maintaining structure a 7 on a D-shaped tube a 26 surrounding the surface of the sodium-cooled fast reactor core flowmeter 5 and a pressure maintaining structure b 29 on a D-shaped tube b 27.

[0035] refer to Figure 2The hoisting structure 4 includes a winch 8 fixedly connected to the top of the outer cylinder 1, and a steel cable 9 is wound on the surface of the winch 8. The steel cable 9 extends to the inside of the outer cylinder 1 away from the side of the winch 8 and is connected to the connecting assembly. A bearing support pressure bracket 10 is fixedly connected to the top of the outer cylinder 1. The bearing support pressure bracket 10 is arranged on the surface of the output end of the winch 8. A weighing module 11 is arranged at the bottom of the bearing support pressure bracket 10. The weighing module 11 can measure the hoisting load weight of the winch 8. The function of the weighing module 11 is a common measuring device realized by a pressure sensor. It utilizes the fact that under the action of the measured pressure, the deformation of the object is proportional to the pressure. The principle consists of a contact pressure sensor, a turbine flowmeter, a pressure transmitter, a discharge pressure sensor, etc. The pressure is generated by external loading, and the pressure acts on the deformed part of the sensor, causing the deformed part to change. The sensor uses the changed physical parameters to convert the pressure change, thereby generating pressure data and transmitting it to the main control system to stop rising as a protection system device.

[0036] refer to Figure 3 The connecting assembly includes a connecting long tube 12 that is slidably connected to the inside of the outer tube 1. The bottom of the connecting long tube 12 is fixedly connected to a connecting flange 14. The bottom of the connecting flange 14 can be interconnected with the top of the sodium-cooled fast reactor core flowmeter 5. The top of the connecting long tube 12 is fixedly connected to a counterweight chain 15. Six rollers are provided on the upper end of the counterweight chain 15 to ensure that the steel cable is always centered during operation. The top of the counterweight chain 15 is fixedly connected to a movable pulley group 16. The top of the movable pulley group 16 is fixedly connected to the bottom of the steel cable 9.

[0037] refer to Figure 4 After the outer cylinder 1 is removed, the tail cylinder 31 is composed of a D-shaped cylinder b27, an adjustment cylinder 2, and a fixing base 3. A tilting shaft 30 is fixedly connected to the interior of the D-shaped cylinder b27. A sealing pressure plate b28 is sleeved on the surface of the tilting shaft 30. The outer surface of the sealing pressure plate b28 can contact the inner wall of the D-shaped cylinder b27.

[0038] refer to Figure 4 A flange-fixed observation window 20 is provided on the surface of the connecting long cylinder 12, and a sealed observation window 21 corresponding to the sealing pressure plate b 28 is connected to the surface of the outer cylinder 1.

[0039] refer to Figure 4 The left side of the D-shaped cylinder b 27 is threadedly connected to the pressure plate pin 22. The right end of the pressure plate pin 22 passes through the tail cylinder 31 and extends to the top of the sealing pressure plate b 30. The surface of the D-shaped cylinder b 27 is connected to the spare inflation hole 23 located at the top of the pressure plate pin 22. The pressure plate pin 22 locks the sealing pressure plate b 29 by means of tapered locking.

[0040] refer to Figure 4The surface of the adjustment barrel 2 is connected to several sight glasses 24. An adjustment rod 25 surrounds the outer surface of the adjustment barrel 2. The end of the adjustment rod 25 closest to the adjustment barrel 2 extends through the adjustment barrel 2 and into the interior of the adjustment barrel 2. The adjustment rod 25 is threadedly connected to the adjustment barrel 2. The inner end of the adjustment rod 25 can contact the surface of the sodium-cooled fast reactor core flowmeter 5. A searchlight is installed above the sight glasses 24 to facilitate observation of the actual object within the barrel. The adjustment barrel 2 is made of 304 stainless steel, with a maximum outer diameter of 650mm and an inner diameter of 570mm. A hook is installed above the sight glasses 24. The surface of the hook can be hung with a lead plate to reduce the radiation exposure area and reduce the risk of radiation exposure to the operator.

[0041] refer to Figure 1 , a special device for disassembling and assembling a core flowmeter of a sodium-cooled fast reactor and a method for using the same.

[0042] Disassembly includes the following steps:

[0043] S1: Use a sling to move the outer cylinder 1 to just above the sodium-cooled fast reactor core flowmeter 5, and the winch 8 releases the steel cable 9, so that the steel cable 9 carries the connecting long cylinder 12 downward using the movable pulley set 16. When the connecting long cylinder 12 moves to the top of the sodium-cooled fast reactor core flowmeter 5, the connecting long cylinder 12 is connected to the sodium-cooled fast reactor core flowmeter 5 using the connecting flange 14. After the connection between the two is completed, the winch 8 is started in the reverse direction. The winch 8 reels the steel cable 9 and uses the connecting long cylinder 12 to pull the sodium-cooled fast reactor core flowmeter 5 vertically upward, so that the sodium-cooled fast reactor core flowmeter 5 is completely moved to the inside of the outer cylinder 1 and is located on the top of the sealing pressure plate a19;

[0044] S2: The sealing plate a19 is rotated around the turning axis 18. When the outer surface of the sealing plate a19 contacts the inner wall of the outer tube 1 and the outer tube 1 is separated and sealed, gas is injected into the inner part of the outer tube 1 through the inflation valve 17 to maintain a certain air pressure inside the outer tube 1.

[0045] S3: Rotate the sealing pressure plate b 28 with the turning shaft 30 as the axis to ensure that it is sealed with the inner wall of the tail cylinder 31, remove the flange screws connecting the D-shaped cylinder a 26 and the D-shaped cylinder b 27, and use a crane to move the outer cylinder 1 to the maintenance area.

[0046] The installation consists of the following steps:

[0047] S1: Use a crane to lift the outer cylinder 1 of the repaired sodium-cooled fast reactor core flowmeter 5 to the top of the tail cylinder 31 and slowly lower it so that the flanges connecting the D-shaped cylinder a 26 and the D-shaped cylinder b 27 are in contact, and then tighten the flanges with screws.

[0048] S2: Open the sealing plate a19 and b28, rotating them around the turning axis 18 and 30, respectively, until both plates are fully opened. Use the winch 8 to slowly lower the sodium-cooled fast reactor core flowmeter 5. When the sodium-cooled fast reactor core flowmeter 5 becomes stuck, the weight value of the weighing module 11 decreases, and the system stops. Observe the offset through the sight glass 24 on the surface of the adjustment tube 2, and use the adjustment rod 25 on the surface of the adjustment tube 2 to squeeze the sodium-cooled fast reactor core flowmeter 5 for displacement. After adjusting the centering, continue lowering until it reaches its position.

[0049] S3: Loosen the connection between the adjusting tube 2 and the supporting seat 3, continue to lower the steel cable 9 to the set length, and then slowly lift the lifting device so that the user can remove the connecting bolts between the connecting long tube 12 and the sodium-cooled fast reactor core flowmeter 5. When the connecting long tube 12 and the sodium-cooled fast reactor core flowmeter 5 are disconnected, the connecting long tube 12 is recovered into the inner part of the outer tube 1, thereby completing the disassembly and assembly of the sodium-cooled fast reactor core flowmeter 5.

[0050] The working principle and use process of the present invention are as follows: First, ensure that the device is in a safe state, especially when sodium coolant is involved, and strict safety operating procedures must be followed. Check whether the lifting structure 4, connecting components, pressure maintaining structure 7 and pressure maintaining structure 29 are intact and confirm that they are all in an operable state. Close the inflation valve 17 in the pressure maintaining structure 7, and release the pressure in the D-shaped cylinder a 26 through the spare inflation hole 23 or other safe discharge methods to ensure that no pressure shock is caused to the flow meter and the operator during the disassembly process. First, use the external lifting equipment to lift the outer cylinder 1 to the top of the sodium-cooled fast reactor core flow meter 5, start the winch 8, and start it to slowly release the steel cable 9, driving the movable pulley group 16 and the counterweight chain 15 to move downward. When the bottom of the connecting long cylinder 12 contacts the top of the sodium-cooled fast reactor core flow meter 5, the two are connected by connecting bolts. When the two are connected, release the outer cylinder 1 to descend so that the outer cylinder 1 contacts the ground. During the descent of the outer cylinder 1, the winch 8 uses the steel cable 9 to reel in the connecting long tube 12, so that the steel cable 9 remains in a tensioned state. When the continuously descending outer tube 1 is sleeved on the top of the sodium-cooled fast reactor core flowmeter 5, the sodium-cooled fast reactor core flowmeter 5 is connected to the outer tube 1 and the guidance is completed. At the same time, the external hoisting equipment can lift the outer tube 1, so that the outer tube 1 carries the sodium-cooled fast reactor core flowmeter 5 up. When the sodium-cooled fast reactor core flowmeter 5 is completely off the ground, the internal hoist 8 uses the steel cable 9 to reel in the connecting long tube 12, so that the connecting long tube 12 carries the sodium-cooled fast reactor core flowmeter 5 and passes through the D-shaped tube a in sequence. 26 and D-shaped cylinder b 27 and move them to the inside of the outer cylinder 1. During the lifting process, the operator can observe the situation inside the regulating cylinder 2 through the sight glass 24 to ensure that the sodium-cooled fast reactor core flowmeter 5 is unobstructed during the lifting process, and properly adjust the regulating rod 25 to prevent the sodium-cooled fast reactor core flowmeter 5 from colliding with the inner wall of the regulating cylinder 2 or the regulating rod 25. When the sodium-cooled fast reactor core flowmeter 5 moves to the top of the D-shaped cylinder 26, the sealing pressure plate a19 is controlled to swing by the turning shaft 18. When the outer surface of the sealing pressure plate a19 is in close contact with the inner wall of the D-shaped cylinder a 26 and the D-shaped cylinder a 26 is completely sealed, gas is injected into the interior of the upper D-shaped cylinder 26 through the inflation valve 17 to maintain a certain air pressure inside the upper D-shaped cylinder a 26. When the air pressure inside the D-shaped cylinder a 26 is consistent with the external environmental pressure, the D-shaped cylinder a 26 and the D-shaped cylinder b 27 are separated and the outer cylinder 1 and the top D-shaped cylinder a 26 are carried by external lifting equipment. 26 Move to the maintenance area for maintenance operations.

[0051] In summary, the special device for disassembling and assembling the sodium-cooled fast reactor core flowmeter and the method for using the same can greatly improve the safety of loading and unloading the sodium-cooled fast reactor core flowmeter 5 by hoisting, making the installation of the sodium-cooled fast reactor core flowmeter 5 more flexible and adjustable according to actual on-site conditions, thereby reducing installation difficulty and cost.

[0052] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0053] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A special device for disassembling and assembling a core flowmeter of a sodium-cooled fast reactor, comprising an outer cylinder (1), characterized in that: The interior of the outer cylinder (1) is configured to be hollow, the bottom of the outer cylinder (1) is fixedly connected to an adjusting cylinder (2), the bottom of the adjusting cylinder (2) is fixedly connected to a supporting seat (3), the top of the outer cylinder (1) is provided with a hoisting structure (4), the interior of the outer cylinder (1) is provided with a hoisting structure (4) for connecting and lifting a sodium-cooled fast reactor core flowmeter (5), the sodium-cooled fast reactor core flowmeter (5) can be connected to the hoisting structure (4) through a connecting assembly, the hoisting structure (4) can drive the sodium-cooled fast reactor core flowmeter (5) to vertically rise and fall inside the outer cylinder (1), the adjusting cylinder (2) and the supporting seat (3), the top of the right side of the outer cylinder (1) is connected to an exhaust pipe (6), the outer cylinder (1) ) is provided with a pressure maintaining structure (7) surrounding the D-shaped cylinder a (26) on the surface of the sodium-cooled fast reactor core flowmeter (5) and a pressure maintaining mechanism (29) on the D-shaped cylinder b (27), the hoisting structure (4) includes a winch (8) fixedly connected to the top of the outer cylinder (1), a steel cable (9) is wound around the surface of the winch (8), the steel cable (9) extends to the inside of the outer cylinder (1) away from the side of the winch (8) and is connected to the connecting assembly, the top of the outer cylinder (1) is fixedly connected with a bearing support pressure bracket (10), the bearing support pressure bracket (10) is sleeved on the surface of the output end of the winch (8), and a weighing module (11) is provided at the bottom of the bearing support pressure bracket (10), the weighing module (11) It is possible to measure the hoisting load of the winch (8), the connecting assembly includes a connecting long tube (12) slidably connected to the inside of the outer tube (1), the bottom of the connecting long tube (12) is fixedly connected to a connecting flange (14), the bottom of the connecting flange (14) is interconnected with the top of the sodium-cooled fast reactor core flowmeter (5), the top of the connecting long tube (12) is fixedly connected to a counterweight chain (15), the top of the counterweight chain (15) is fixedly connected to a movable pulley group (16), the top of the movable pulley group (16) is fixedly connected to the bottom of the steel cable (9), the pressure maintaining structure (7) includes a D-shaped tube a (26) and a D-shaped tube b (27) connected to the surface of the outer tube (1), the D-shaped tube a (26) is fixedly connected to the bottom of the steel cable (9), and the pressure maintaining structure (7) includes a D-shaped tube a (26) and a D-shaped tube b (27) connected to the surface of the outer tube (1). ) and D-shaped cylinder b (27) are stacked and connected to each other, and the right sides of the D-shaped cylinder a (26) and the D-shaped cylinder b (27) are both connected to the inflation valve (17), and the interior of the D-shaped cylinder a (26) is fixedly connected to the flip shaft (18), and the surface of the flip shaft (18) is provided with a sealing pressure plate a (19), and the outer surface of the sealing pressure plate a (19) can contact the inner wall of the D-shaped cylinder a (26), and the surface of the regulating cylinder (2) is connected to a plurality of sight glasses (24), and the outer surface of the regulating cylinder (2) is surrounded by an regulating rod (25), and the end of the regulating rod (25) close to the regulating cylinder (2) passes through the regulating cylinder (2) and extends to the interior of the regulating cylinder (2), and the regulating rod (25) is threadedly connected to the regulating cylinder (2).The inner end of the regulating rod (25) can contact the surface of the sodium-cooled fast reactor core flow meter (5).

2. The special device for disassembling and assembling a core flowmeter of a sodium-cooled fast reactor according to claim 1, characterized in that: A flange-fixed observation window (20) is provided on the surface of the connecting long cylinder (12), and a sealing observation window (21) corresponding to the sealing pressure plate a (19) is communicated with on the surface of the outer cylinder (1).

3. The special device for disassembling and assembling a core flowmeter of a sodium-cooled fast reactor according to claim 2, characterized in that: The left side of the D-shaped cylinder a (26) is threadedly connected to a pressure plate pin (22), the right end of the pressure plate pin (22) passes through the outer cylinder (1) and extends to the top of the sealing pressure plate a (19), and the surface of the D-shaped cylinder a (26) is connected to a spare inflation hole (23) located at the top of the pressure plate pin (22).

4. The method for using the dedicated device for disassembling and assembling a core flowmeter of a sodium-cooled fast reactor according to claim 3, characterized in that it comprises the following steps: S1: Use a crane to move the outer cylinder (1) to the top of the sodium-cooled fast reactor core flow meter (5) that has not been disassembled, reserve 500mm installation space between the lower flange of the support seat (3) and the mounting flange of the sodium-cooled fast reactor core flow meter (5), release the connecting long cylinder (12) by the winch (8), and make the steel cable (9) move downward with the movable pulley group (16). When the connecting long cylinder (12) moves to the top of the sodium-cooled fast reactor core flow meter (5), use the connecting screws to connect the lower flange of the connecting long cylinder (12) and the mounting flange of the sodium-cooled fast reactor core flow meter (5). When the two are connected, remove the screws on the fixing seat of the sodium-cooled fast reactor core flow meter (5) at the same time, start the winch (8) in the reverse direction, and the winch (8) reels the steel cable (9). And keep it in a slightly tightened state, and read the value of the weighing module (11), use a crane to move the outer tube (1) connection support seat (3) below to the flange of the outer fixed seat of the unassembled sodium-cooled fast reactor core flowmeter (5), and observe the value of the weighing module at the same time. If it is found to be reduced, the winch (8) can be used to slowly pull up the sodium-cooled fast reactor core flowmeter (5) connected to the connecting long tube (12), and wait until the connecting support seat (3) is lowered to the bottom, stop the winch (8) from pulling up the connecting long tube (12). At this time, use screws to connect the flange of the support seat (3) and the docking flange, and the sodium-cooled fast reactor core flowmeter (5) can be pulled vertically by using the connecting long tube (12) to move the sodium-cooled fast reactor core flowmeter (5) completely to the inside of the outer tube (1) and located on the top of the sealing pressure plate a (19); S2: rotating the sealing pressure plate a (19) with the turning shaft (18) as the axis, when the outer surface of the sealing pressure plate a (19) contacts the inner wall of the outer cylinder (1) and the outer cylinder (1) is divided and sealed, rotating the sealing pressure plate b (28) with the turning shaft (30) as the axis, when the outer surface of the sealing pressure plate b (28) contacts the inner wall of the tail cylinder (31) and the tail cylinder (31) is divided and sealed from the outside, injecting gas into the interior of the outer cylinder (1) through the inflation valve (17) to maintain a certain air pressure inside the outer cylinder (1); S3: Remove the flange screws connecting the D-shaped cylinder a (26) and the D-shaped cylinder b (27), and use a crane to move the outer cylinder (1) to the maintenance area; S4: The repaired sodium-cooled fast reactor core flowmeter (5) is hoisted to the top of the tail tube (31). When the two are connected, the sealing pressure plate a (19) and the sealing pressure plate b (28) are opened, and part of the argon gas inside the outer tube (1) is replaced with the gas inside the device, so that the internal pressure of the outer tube (1) is consistent with the internal pressure of the device. When the replacement is completed, the sodium-cooled fast reactor core flowmeter (5) is slowly lowered by the winch (8). When the sodium-cooled fast reactor core flowmeter (5) is stuck, the weight value of the weighing module (11) decreases, and the system stops. The offset condition is observed through the sight glass (24) on the surface of the adjusting tube (2) and the adjusting rod (25) on the surface of the adjusting tube (2) is used to squeeze the sodium-cooled fast reactor core flowmeter (5) for displacement. After adjustment and alignment, it continues to be lowered until it is in place. S5: Loosen the connection between the adjustment tube (2) and the support seat (3), continue to lower the steel cable (9) to the set length, and then slowly lift the lifting device so that the user can remove the connecting bolts between the connecting long tube (12) and the sodium-cooled fast reactor core flow meter (5). When the connecting long tube (12) and the sodium-cooled fast reactor core flow meter (5) are disconnected, the connecting long tube (12) is recovered into the interior of the outer tube (1), thereby completing the disassembly and assembly of the sodium-cooled fast reactor core flow meter (5).

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