An anti-crystallization pressure-introducing type liquid level measuring device applicable to seismic loads

Abstract

The present invention relates to an anti-crystallization pressure-introducing type liquid level measuring device applicable to seismic loads. By using the anti-crystallization pressure-introducing type liquid level measuring device provided by the present invention, the medium led out from the container is isolated from the medium in the capillary through a capillary single remote transmission flange detection device. A full-length heat preservation coating design is carried out on the instrument pressure guide pipe for the boron-containing medium to reduce its heat loss. Considering the crystallization characteristics of the boron-containing medium, the blockage of the instrument pressure guide pipe is prevented, ensuring that the pressure can be transmitted to the pressure transmitter and effectively improving the reliability of liquid level detection. At the same time, the present invention conducts seismic design on the main support, component layout frame, pressure transmitter support, capillary single remote transmission flange detection device support, support members of the instrument pressure guide pipe heat preservation device and their accessories, etc. The stress under the action of the corresponding seismic acceleration meets the relevant requirements of the RCC-M code, effectively improving the seismic resistance and stability of the installation of the measuring device.

Description

Technical Field

[0001] The present invention belongs to the technical field of liquid level measuring devices for boric acid solutions, and relates to an anti-crystallization pressure-introducing type liquid level measuring device applicable to seismic loads. Background Art

[0002] The emergency boron injection system is provided with a boric acid injection tank for storing boric acid solution. The boric acid injection tank is a cylindrical stainless steel atmospheric pressure container filled with boron-containing water of a certain concentration. The boric acid injection tank is also provided with redundant electric heaters and a heat preservation layer on the tank body to ensure that the boric acid solution in the boric acid injection tank does not crystallize. The function of the emergency boron injection system is to inject boric acid solution into the reactor coolant system during specific accident transients to achieve core boronization and ensure the subcritical state of the core.

[0003] The boric acid injection tank should be provided with a liquid level measuring device for continuously monitoring the liquid level signal in the tank and alarming for low-value liquid level signals to ensure that there is sufficient boric acid solution in the boric acid injection tank. For the setting of the liquid level measuring device for the boric acid injection tank, the following 3 points usually need to be satisfied: 1) Prevent boron crystallization from causing errors in instrument measurement; 2) Facilitate maintenance and instrument calibration; 3) Meet seismic performance.

[0004] Currently, the commonly used methods for measuring the liquid level in a container are: float level gauge, inserted magnetic float level gauge, magnetic flap level gauge, guided wave radar level gauge, ultrasonic level gauge, gas blowing method, pressure transmitter, etc. These different measuring methods have their own advantages under different measuring conditions, such as being convenient for use, maintenance, and operation, having good operability, being resistant to high pressure, and having high precision, so they are widely used in container liquid level measurement, remote transmission, or indication. However, for specific working conditions, each of the above measuring methods also has different disadvantages.

[0005] If a float level gauge is used, its measurement principle is that the buoyancy of the float is transmitted to the working rod of the sensor through the float rod and torque tube, and then acts on the free end of the sensor element. The float rod needs to be perpendicular to the liquid surface to ensure that the float can smoothly follow the liquid level movement. Based on this measurement principle, a special interface for liquid level gauge measurement needs to be reserved on the tank top, and the liquid level gauge is installed on the tank top, which is not conducive to instrument adjustment and maintenance. Similarly, the guided wave radar level gauge and ultrasonic level gauge also have the same problem and are not suitable for the liquid level measurement of the boric acid injection tank.

[0006] Although the inserted magnetic float level gauge has the advantages of being resistant to high pressure, easy to maintain, reliable and convenient to install, and having a small maintenance amount, after long-term use, liquid impurities will cause the float to move up and down inflexibly and need to be cleaned in time. Moreover, when the density of the measured medium changes, it will affect the measurement accuracy, resulting in general accuracy and being not suitable for the liquid level measurement of the boric acid injection tank.

[0007] The magnetic flap level gauge has a simple structure, clear on-site display, prominent markings and intuitive readings. However, a liquid level measurement opening needs to be reserved on the side of the boric acid injection tank. After installing the level gauge, the insulation range of the boric acid injection tank needs to be re-evaluated. In addition, the functional grade of the boric acid injection tank is F-SC2, and the seismic grade is 1I. After installing the magnetic flap level gauge, its self-weight and the seismic displacement under the working condition acceleration need to be re-evaluated for their impact on the seismic grade of the boric acid injection tank. It is not suitable for the liquid level measurement of the boric acid injection tank.

[0008] The air-blowing method for liquid level measurement requires a lot of auxiliary equipment, and the actual on-site installation space cannot meet the requirements. It is mainly used in negative pressure environments. This method has a high operating cost and great maintenance difficulty, and is also not suitable for the liquid level measurement of the boric acid injection tank. Summary of the Invention

[0009] Aiming at the defects existing in the prior art, the purpose of the present invention is to provide an anti-crystallization pressure-introducing type liquid level measurement device applicable to seismic loads, which is used to cope with the expected transient accident conditions without an emergency reactor shutdown. On the basis of preventing the crystallization of the medium in the pressure guide pipe, its seismic resistance can still be ensured, the problems existing in the prior art solutions are solved, and it has a reliable liquid level measurement function for the boron injection tank to ensure the normal process requirements.

[0010] To achieve this purpose, the present invention provides an anti-crystallization pressure-introducing type liquid level measurement device applicable to seismic loads, including a main support, a component layout frame, a signal conversion unit, a capillary single remote flange detection unit, an instrument pressure guide pipe, and an instrument pressure guide pipe insulation device, wherein:

[0011] The main support mainly includes a portal support and an anchor plate. The portal support includes two legs, a cross beam, and a cross bar. The upper ends of the two legs are fixedly connected by the cross beam, the middle parts of the two legs are fixedly connected by the cross bar, and the lower end of each leg is fixedly connected to an anchor plate respectively;

[0012] The component layout frame is fixedly installed on the portal support and is used for installing and arranging the capillary single remote flange detection unit, the instrument pressure guide pipe, and the instrument pressure guide pipe insulation device;

[0013] The signal conversion unit includes a pressure transmitter and a pressure transmitter support;

[0014] The capillary single remote flange detection unit includes a capillary single remote flange detection device and a capillary single remote flange detection device support;

[0015] The instrument pressure guide pipe is connected to the first end of the capillary single remote flange detection device, and the capillary at the second end of the capillary single remote flange detection device is connected to the pressure transmitter.

[0016] Further, the portal bracket is mainly welded by square steel, and continuous welding is used for fixed connection between the square steels. The welding form of T-shaped joint I-groove is adopted between the square steels;

[0017] Each of the legs is fixedly connected to one of the anchor plates by continuous welding;

[0018] The anchor plate is fixedly installed beside the container through expansion bolts.

[0019] Further, two gusset plates are arranged between each portal leg and the anchor plate, and the leg and the anchor plate are reinforced and connected through the gusset plates.

[0020] Further, the pressure transmitter adopts a nuclear-grade pressure transmitter;

[0021] The capillary single remote transmission flange detection device is a nuclear safety-class capillary single remote transmission flange detection device.

[0022] Further, the first end of the instrument pressure guiding pipe is connected to the extraction root valve to extract the medium in the container;

[0023] The second end of the instrument pressure guiding pipe transmits the pressure signal to the first end of the capillary single remote transmission flange detection device, and further transmits the pressure signal to the capillary at the second end of the capillary single remote transmission flange detection device. The capillary transmits the pressure signal to the pressure transmitter;

[0024] The capillary single remote transmission flange detection device isolates the medium extracted from the container from the medium in the capillary.

[0025] Further, a plurality of steel plates and angle steels are fixedly installed on the component layout frame.

[0026] Further, the measuring device further includes a heat insulation plate;

[0027] The bracket of the capillary single remote transmission flange detection device is fixedly installed on the steel plate through bolt assemblies. The heat insulation plate is fixedly installed on the bracket of the capillary single remote transmission flange detection device through bolt assemblies. The detection device of the capillary single remote transmission flange is fixedly installed on the heat insulation plate through bolt assemblies.

[0028] Further, the measuring device further includes U-shaped pipe clamps and an instrument pressure guiding pipe heat insulation plate;

[0029] The instrument pressure guiding pipe heat insulation plate is fixed on the steel plate through bolt assemblies. The instrument pressure guiding pipe passes through between the U-shaped pipe clamps and the instrument pressure guiding pipe heat insulation plate. The instrument pressure guiding pipe heat insulation plate and the U-shaped pipe clamps are fixedly connected through bolt assemblies. The instrument pressure guiding pipe is fixedly installed on the instrument pressure guiding pipe heat insulation plate through the U-shaped pipe clamps;

[0030] Except for the contact portion with the instrument pressure pipe insulation board, the instrument pressure pipe and the outer periphery of the U-shaped pipe clamp are fully covered by the instrument pressure pipe insulation device.

[0031] Furthermore, the instrument pressure pipe insulation device includes an insulation layer and a steel plate layer;

[0032] Except for the contact portion with the instrument pressure pipe insulation board, the insulation layer completely covers the periphery of the instrument pressure pipe and the U-shaped pipe clamp along the length direction of the instrument pressure pipe, and the steel plate layer covers and is fixed on the periphery of the insulation layer.

[0033] Furthermore, the pressure transmitter bracket includes an arched plate, the arched plate is fixedly mounted on the crossbar via a long threaded rod bolt assembly, and the arched plate is connected and fixed to the pressure transmitter via a bolt assembly.

[0034] The beneficial effect of the present invention is that the anti-crystallization pressure-drawing type liquid level measuring device suitable for earthquake load provided by the present invention is used to isolate the medium drawn from the container from the medium in the capillary through the capillary single remote transmission flange detection device, and the instrument pressure pipe containing boron medium is designed with full insulation coating to reduce its heat loss, taking into account the crystallization characteristics of the boron-containing medium, preventing the instrument pressure pipe from being blocked, ensuring that the pressure can be transmitted to the pressure transmitter, and effectively improving the reliability of liquid level detection. At the same time, the present invention performs earthquake-resistant design on the main bracket, component layout frame, pressure transmitter bracket, capillary single remote transmission flange detection device bracket, instrument pressure pipe insulation device support, etc. and its accessories, and the stress under the corresponding earthquake acceleration meets the relevant requirements of the RCC-M specification, effectively improving its installation seismic resistance and stability. Moreover, the measuring device provided by the present invention can still maintain the integrity and sealing of the measuring device under earthquake conditions, has a stable liquid level measurement function, meets the process requirements, and has a signal remote transmission alarm function. In addition, the steel materials used in the present invention are all national standard parts, which are convenient to purchase; the provided measuring device is easy to install and disassemble, the instrument maintenance and repair are convenient, and the maintenance cost is low. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 A schematic diagram of the main support structure of an anti-crystallization pressure-induced liquid level measuring device suitable for earthquake loads provided by an embodiment of the present invention;

[0036] Figure 2 A schematic diagram of a component arrangement framework of a measuring device provided in an embodiment of the present invention;

[0037] Figure 3 A schematic diagram of the installation structure of a detection device for a capillary single remote transmission flange of a measuring device provided in an embodiment of the present invention;

[0038] Figure 4Schematic structural diagram of the instrument pressure guiding pipe heat preservation device of the measuring device provided by the embodiment of the present invention;

[0039] Figure 5 Schematic structural diagram of the installation of the instrument pressure guiding pipe of the measuring device provided by the embodiment of the present invention;

[0040] Figure 6 Schematic structural diagram of the installation of the pressure transmitter of the measuring device provided by the embodiment of the present invention.

[0041] Wherein, 1 - square steel; 2 - angle plate for square steel 150; 3 - anchor plate; 4 - component layout frame; 5 - steel plate; 6 - heat insulation plate of instrument pressure guiding pipe; 7 - bracket of capillary single remote transmission flange detection device; 8 - instrument pressure guiding pipe heat preservation device; 9 - bow-shaped plate; 10 - heat insulation plate; 11 - heat preservation layer; 12 - angle steel. Specific embodiments

[0042] In order to make the above objects, features and advantages of the present invention more obvious and understandable, the technical solutions of the present invention will be further clearly and completely described below in conjunction with the accompanying drawings and specific embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0043] As Figure 1-6 shown, a crystallization-proof pressure guiding type liquid level measuring device applicable to seismic loads provided by the embodiment of the present invention includes a main bracket, a component layout frame 4, a signal conversion unit, a capillary single remote transmission flange detection unit, an instrument pressure guiding pipe, an instrument pressure guiding pipe heat preservation device 8, and a heat insulation plate 10;

[0044] As Figure 1 shown, the main bracket mainly includes a portal bracket and an anchor plate 3 fixedly connected; the portal bracket includes two legs, a cross beam, and a cross bar, and the upper ends of the two legs are fixedly connected by the cross beam, and the middle parts of the two legs are fixedly connected by the cross bar. The portal bracket is mainly welded by square steel 1, the specification of the square steel 1 is 150mm×150mm×12mm, the grade is Q355B, and its execution standard is GB / T1591-2008 "Low alloy high strength structural steel"; the square steels 1 are fixedly connected by continuous welding, and the welding form between the square steels 1 is the welding form of T-shaped joint I-shaped groove. The lower end of each leg is fixedly connected to an anchor plate 3 by continuous welding. The anchor plate 3 is fixedly installed on the open space beside the container (boric acid injection tank) through expansion bolts.

[0045] Two through holes are respectively arranged on each leg for fixed installationFigure 2 The component layout frame 4 shown in the figure; the component layout frame 4 is fixedly installed on the portal bracket by a bolt assembly passing through the penetration holes, and is used for installing and arranging the capillary single remote transmission flange detection unit, the instrument pressure guide pipe, the instrument pressure guide pipe heat preservation device 8, the heat insulation board 10, and the corresponding instrument valves and fittings.

[0046] The signal conversion unit includes a pressure transmitter, a pressure transmitter bracket and accessories; the pressure transmitter adopts a K3 nuclear-grade pressure transmitter, which is an anti-seismic signal conversion instrument, and is used for converting the collected pressure signal into an electric current signal. The pressure transmitter outputs the electric current signal (4-20 mA) to the terminal through a cable, and the level in the container (boric acid injection tank) can be judged through the electric current signal received by the terminal.

[0047] The capillary single remote transmission flange detection unit includes a capillary single remote transmission flange detection device, a capillary single remote transmission flange detection device bracket and accessories; the capillary single remote transmission flange detection device is a nuclear safety-grade capillary single remote transmission flange detection device.

[0048] The first end of the instrument pressure guide pipe is connected to the lead root valve to lead out the medium in the container (boric acid injection tank). The second end of the instrument pressure guide pipe is connected to the first end of the capillary single remote transmission flange detection device and transmits the pressure signal to the first end of the capillary single remote transmission flange detection device, and then transmits the pressure signal to the capillary in the second end of the capillary single remote transmission flange detection device. The capillary is connected to the pressure transmitter and transmits the pressure signal to the pressure transmitter. The capillary single remote transmission flange detection device can isolate the medium led out from the container from the medium in the capillary.

[0049] To enhance the anti-seismic stability of the measuring device, 2 angle plates are arranged between each leg and the anchor plate 3, and the leg and the anchor plate are reinforced and connected through the angle plates. The angle plates are square steel 150 angle plates 2, and each square steel 150 angle plate 2 is fixedly connected to the anchor plate 3 and the leg respectively. There are 8 penetration holes on the portal bracket. Among them, 4 penetration holes are arranged on the side frame of the portal bracket, and two penetration holes are respectively arranged on each leg for fixedly installing Figure 2 the component layout frame 4 shown in the figure; the remaining 4 penetration holes are arranged on the crossbar for fixedly installing Figure 2 and Figure 6 the bow-shaped plate 9 shown in the figure.

[0050] Optionally, the thickness of the square steel 150 angle plate 2 is 20 mm.

[0051] Optionally, the fixed connection methods of the square steel 150 angle plate 2 with the anchor plate 3 and the square steel 150 angle plate 2 with the portal bracket are both continuous welding.

[0052] As shown Figure 2 in FIG. 1, the component layout frame 4 includes a rectangular frame body, a plurality of steel plates 5, and angle steels 12, and is used for fixedly installing a capillary single remote transmission flange detection unit, an instrument pressure guide pipe, an instrument pressure guide pipe heat preservation device 8, a heat insulation plate 10, and corresponding instrument valves and fittings.

[0053] Optionally, the plurality of steel plates 5 are arranged side by side along the length direction of the rectangular frame body within the rectangular frame body, and both ends of the steel plate 5 are fixedly connected to the two long sides of the rectangular frame body respectively. Two angle steels 12 are fixedly installed on each short side of the rectangular frame body, and each angle steel 12 is provided with a reserved hole. The component layout frame 4 is fixedly installed on the gantry bracket by a bolt assembly passing through the reserved hole and the through hole, and the component layout frame 4 is located above the crossbar.

[0054] Optionally, the angle steels 12 and the steel plates 5 are fixedly installed on the component layout frame 4 by a bolt assembly.

[0055] As shown Figure 3 in FIG. 2, the capillary single remote transmission flange detection device bracket 7 is fixedly installed on the steel plate 5 by 2 bolt assemblies, the heat insulation plate 10 is connected and fixed to the capillary single remote transmission flange detection device bracket 7 by 4 bolt assemblies, and the detection device of the capillary single remote transmission flange is fixedly installed on the heat insulation plate 10 by 8 bolt assemblies provided thereon.

[0056] As shown Figure 5 in FIG. 3, the U-shaped pipe clamp is a support for the instrument pressure guide pipe. The instrument pressure guide pipe heat insulation plate 6 is fixedly installed on the steel plate 5 by a bolt assembly. The instrument pressure guide pipe passes through between the U-shaped pipe clamp and the instrument pressure guide pipe heat insulation plate 6. The instrument pressure guide pipe heat insulation plate 6 and the U-shaped pipe clamp are fixedly connected by a bolt assembly. The instrument pressure guide pipe is fixedly installed on the instrument pressure guide pipe heat insulation plate 6 by the U-shaped pipe clamp. At the contact part between the instrument pressure guide pipe and the instrument pressure guide pipe heat insulation plate 6, the instrument pressure guide pipe is heat-insulated by the instrument pressure guide pipe heat insulation plate 6; except for the contact part with the instrument pressure guide pipe heat insulation plate 6, the outer periphery of the instrument pressure guide pipe and the U-shaped pipe clamp is completely coated by the instrument pressure guide pipe heat preservation device 8; the instrument pressure guide pipe heat preservation device 8 and the instrument pressure guide pipe heat insulation plate 6 are combined to completely seal and wrap the instrument pressure guide pipe along the direction of the instrument pressure guide pipe. Thus, the instrument pressure guide pipe heat preservation device 8 and the instrument pressure guide pipe heat insulation plate 6 are used to achieve full-course heat insulation of the instrument pressure guide pipe to ensure that the instrument pressure guide pipe will not cause crystallization of the medium solution due to contact heat release.

[0057] As shown Figure 4As shown in the figure, the instrument pressure guide pipe heat preservation device 8 includes a heat preservation layer 11 and a steel plate layer. Except for the part in contact with the instrument pressure guide pipe heat insulation board 6, the heat preservation layer 11 is wrapped around the outer circumference of the instrument pressure guide pipe and the U-shaped pipe clamp along the length direction of the instrument pressure guide pipe, and the steel plate layer is wrapped and fixed on the outer circumference of the heat preservation layer. The installation method of the instrument pressure guide pipe heat preservation device 8 is as follows: along the length direction of the instrument pressure guide pipe, except for the part in contact with the instrument pressure guide pipe heat insulation board 6, a 40-mm-thick heat preservation layer 11 is wrapped around the outer circumference of the instrument pressure guide pipe and the U-shaped pipe clamp. The heat preservation layer 11 should be compacted and pressed tightly, and closely attached to the outer wall of the instrument pressure guide pipe. The outer circumference of the heat preservation layer 11 is tightly wrapped with a 0.5-mm-thick steel plate layer. After wrapping around for one week, the overlapping part of the steel plate layer along the circumference of the heat preservation layer is set to 30 mm, and then self-tapping screws are tightened at the overlapping part of the steel plate layer, and the spacing of the self-tapping screws is 200 mm.

[0058] Optionally, for the instrument pressure guide pipe section that does not contact the instrument pressure guide pipe heat insulation board 6, the 40-mm-thick heat preservation layer 11 is wrapped around the outer wall of the instrument pressure guide pipe along the length direction of the instrument pressure guide pipe, and the 0.5-mm-thick steel plate layer is wrapped and fixed on the outer circumference of the heat preservation layer. For the instrument pressure guide pipe section corresponding to the part where the instrument pressure guide pipe contacts the instrument pressure guide pipe heat insulation board 6, the laying method of the instrument pressure guide pipe heat preservation device 8 along the length direction of the instrument pressure guide pipe is as follows: except for the part in contact with the instrument pressure guide pipe heat insulation board 6, a 40-mm-thick heat preservation layer 11 is wrapped around the outer circumference of the instrument pressure guide pipe and the U-shaped pipe clamp, and the heat preservation layer 11 is filled and compacted at the boundary gap where the instrument pressure guide pipe contacts the instrument pressure guide pipe heat insulation board 6; then, the outer circumference of the heat preservation layer 11 is tightly wrapped with a 0.5-mm-thick first steel plate layer. The length of the first steel plate layer along the length direction of the instrument pressure guide pipe is greater than the length of the part where the instrument pressure guide pipe contacts the instrument pressure guide pipe heat insulation board 6, so as to ensure that both ends of the first steel plate layer can overlap with the steel plate layer wrapped around the outer circumference of the instrument pressure guide pipe section that does not contact the instrument pressure guide pipe heat insulation board 6, and the overlapping part of the steel plate layer and the first steel plate layer is tightened with self-tapping screws. Thus, it is ensured that the instrument pressure guide pipe heat preservation device 8 and the instrument pressure guide pipe heat insulation board 6 provide full heat preservation for the instrument pressure guide pipe, and it is ensured that the medium solution will not crystallize due to contact heat release of the instrument pressure guide pipe.

[0059] As Figure 6 shown in the figure, the pressure transmitter support and accessories include an arcuate plate 9 and a screw rod assembly. The arcuate plate 9 is made of a 5-mm-thick steel plate. The arcuate plate 9 is fixedly installed on the crossbar through a 200-mm-long threaded rod bolt assembly passing through 4 through holes, and the arcuate plate 9 is fixedly connected to the pressure transmitter through a bolt assembly.

[0060] Optionally, the arcuate plate 9 is fixedly connected to the pressure transmitter by using a threaded rod of specification M10×200 (L = 200) in cooperation with corresponding nuts and washers.

[0061] A crystallization-proof pressure-introducing type liquid level measuring device applicable to seismic loads provided by an embodiment of the present invention, by setting a K3 nuclear-grade pressure transmitter, a nuclear safety-grade capillary single-remote transmission flange detection device, a main support, a component layout frame, an instrument pressure guide pipe, an instrument pressure guide pipe heat preservation device, and a heat insulation plate, a full-process heat preservation coating design is carried out on the instrument pressure guide pipe for the boron-containing medium to reduce its heat loss; the main support, the component layout frame, the pressure transmitter support, the capillary single-remote transmission flange detection device support, the support members of the instrument pressure guide pipe heat preservation device, etc. and their accessories are subjected to mechanical analysis using the general finite element program ANSYS, and the stress under the corresponding seismic acceleration meets the relevant requirements of the RCC-M code. The integrity of the mechanical properties of the measuring device under various working conditions required by the RCC-M code has been proven.

[0062] The measuring device uses the general finite element program ANSYS in the United States for mechanical analysis, and finally the analysis report shows that the stresses all meet the relevant requirements of the GB-T 16702 code, indicating that this set of measuring devices can maintain the liquid level measurement function under seismic conditions.

[0063] The measuring device described in this embodiment can still maintain the integrity and tightness of the measuring device under seismic conditions, has a stable liquid level measurement function, meets the process requirements, and has a signal remote transmission alarm function. The measuring device can be used for liquid level measurement in situations similar to the above embodiments, and is particularly suitable for liquid level measurement under working conditions such as seismic conditions and low temperature conditions.

[0064] The above embodiments only illustrate the structural form, installation and use methods of the device described in the present invention. Those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and its equivalent technologies, the present invention also intends to include these changes and modifications.

Claims

1. A crystallization-preventing and pressure-introducing type liquid level measuring device applicable to seismic loads, characterized in that, it includes a main bracket, a component layout frame, a signal conversion unit, a capillary single remote transmission flange detection unit, an instrument pressure guide pipe, and an instrument pressure guide pipe heat preservation device, wherein: The main bracket includes a portal bracket and an anchoring plate. The portal bracket includes two legs, a cross beam, and a cross bar. The upper ends of the two legs are fixedly connected by the cross beam, and the middle parts of the two legs are fixedly connected by the cross bar. The lower end of each leg is respectively fixedly connected to an anchoring plate; The component layout frame is fixedly installed on the portal bracket and is used for installing and arranging the capillary single remote transmission flange detection unit, the instrument pressure guide pipe, and the instrument pressure guide pipe heat preservation device; The signal conversion unit includes a pressure transmitter and a pressure transmitter bracket; The capillary single remote transmission flange detection unit includes a capillary single remote transmission flange detection device and a capillary single remote transmission flange detection device bracket; The instrument pressure guide pipe is connected to the first end of the capillary single remote transmission flange detection device, and the capillary at the second end of the capillary single remote transmission flange detection device is connected to the pressure transmitter; The measuring device further includes a U-shaped pipe clamp and an instrument pressure guide pipe heat insulation plate; at the contact part between the instrument pressure guide pipe and the instrument pressure guide pipe heat insulation plate, the instrument pressure guide pipe is heat-insulated through the instrument pressure guide pipe heat insulation plate; except for the contact part with the instrument pressure guide pipe heat insulation plate, the outer periphery of the instrument pressure guide pipe and the U-shaped pipe clamp is entirely covered by the instrument pressure guide pipe heat preservation device; the instrument pressure guide pipe heat preservation device and the instrument pressure guide pipe heat insulation plate are combined to hermetically wrap the instrument pressure guide pipe along the direction of the instrument pressure guide pipe.

2. The crystallization-preventing and pressure-introducing type liquid level measuring device applicable to seismic loads according to claim 1, characterized in that, The portal bracket is welded by square steel, and continuous welding is used for fixed connection between the square steels, and the welding form of T-shaped joint I-shaped groove is adopted between the square steels; Each leg is fixedly connected to one of the anchoring plates by continuous welding; The anchoring plate is fixedly installed beside the container through expansion bolts.

3. The crystallization-preventing and pressure-introducing type liquid level measuring device applicable to seismic loads according to claim 2, characterized in that, Two gusset plates are arranged between each leg and the anchoring plate, and the leg and the anchoring plate are reinforced and connected through the gusset plates.

4. The crystallization-preventing and pressure-introducing type liquid level measuring device applicable to seismic loads according to claim 1, characterized in that, The pressure transmitter adopts a nuclear-grade pressure transmitter; The capillary single remote transmission flange detection device is a nuclear safety-grade capillary single remote transmission flange detection device.

5. The crystallization-preventing and pressure-introducing type liquid level measuring device applicable to seismic loads according to claim 1, characterized in that, The first end of the instrument pressure guide pipe is connected to a root valve for introducing the medium in the container; The second end of the instrument pressure guide pipe transmits the pressure signal to the first end of the capillary single remote transmission flange detection device, and further transmits the pressure signal to the capillary at the second end of the capillary single remote transmission flange detection device, and the capillary transmits the pressure signal to the pressure transmitter; The capillary single remote transmission flange detection device isolates the medium led out from the container from the medium in the capillary.

6. A crystallization-preventing pressure-introducing type liquid level measuring device applicable to seismic loads according to claim 1, characterized in that, a plurality of steel plates and angle steels are fixedly installed on the component arrangement frame.

7. A crystallization-preventing pressure-introducing type liquid level measuring device applicable to seismic loads according to claim 6, characterized in that, the measuring device further includes a heat insulation plate; the support of the capillary single remote transmission flange detection device is fixedly installed on the steel plate through a bolt assembly, the heat insulation plate is fixedly installed on the support of the capillary single remote transmission flange detection device through a bolt assembly, and the detection device of the capillary single remote transmission flange is fixedly installed on the heat insulation plate through a bolt assembly.

8. A crystallization-preventing pressure-introducing type liquid level measuring device applicable to seismic loads according to claim 6, characterized in that, the instrument pressure guiding pipe heat insulation plate is fixedly installed on the steel plate through a bolt assembly, the instrument pressure guiding pipe passes through between the U-shaped pipe clamp and the instrument pressure guiding pipe heat insulation plate, the instrument pressure guiding pipe heat insulation plate and the U-shaped pipe clamp are fixedly connected through a bolt assembly, and the instrument pressure guiding pipe is fixedly installed on the instrument pressure guiding pipe heat insulation plate through the U-shaped pipe clamp.

9. A crystallization-preventing pressure-introducing type liquid level measuring device applicable to seismic loads according to claim 8, characterized in that, the instrument pressure guiding pipe heat preservation device includes a heat preservation layer and a steel plate layer; except for the part in contact with the instrument pressure guiding pipe heat insulation plate, the heat preservation layer is entirely wrapped around the periphery of the instrument pressure guiding pipe and the U-shaped pipe clamp along the length direction of the instrument pressure guiding pipe, and the steel plate layer is wrapped and fixed on the outer periphery of the heat preservation layer.

10. A crystallization-preventing pressure-introducing type liquid level measuring device applicable to seismic loads according to any one of claims 1-9, characterized in that, the pressure transmitter support includes an arcuate plate, the arcuate plate is fixedly installed on the cross bar through a long threaded rod bolt assembly, and the arcuate plate is fixedly connected with the pressure transmitter through a bolt assembly.

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