A liquid level measuring instrument for cryogenic storage tanks

Abstract

The present invention relates to the field of liquid level measurement technology, and specifically discloses a liquid level measuring instrument for a cryogenic container, comprising a superconductor float, a magnetic track, a float position measuring device and a display device. The superconductor float is locked by the magnetic flux of the magnetic track, the magnetic track is fixed on the display device, the float position measuring device is respectively installed on the conductor float and the magnetic track, and the float position measuring device is connected to the display device by signal to display the liquid level information. The superconductor in the superconductor float of the present invention is made of superconducting materials in the prior art, and the material can be adjusted according to the temperature in the cryogenic container; in the present invention, the magnetic flux locking effect of the superconductor in the magnetic field is utilized, so that the position of the superconductor float is controllable, while reducing the friction caused by fixation or measurement, and also solving the problem of mechanical failure or measurement failure caused by frost.

Description

Technical Field

[0001] The invention relates to the technical field of liquid level measurement, and in particular to a liquid level measuring instrument for a cryogenic storage tank. Background Art

[0002] The storage temperature of cryogenic medium (cryogenic liquefied gas), such as liquid nitrogen, under normal pressure is about -196°C. Cryogenic storage tanks used to store cryogenic medium under normal pressure generally have an inner tank and an outer tank, with a vacuum interlayer between the inner tank and the outer tank to achieve the effect of thermal insulation.

[0003] In the prior art, the liquid level measuring instruments used for cryogenic storage tanks are mostly liquid level gauges, tank plug direct insertion pressure level gauges, hanging pressure level gauges and float level gauges. Among them, the liquid level gauge and tank plug direct insertion pressure level gauge can only be used when the cryogenic storage tank is opened or closed. During the liquid extraction process, liquid level measurement cannot be achieved. Although the hanging pressure level gauge and float level gauge can achieve dynamic liquid level measurement in any state, they still have the following problems:

[0004] 1. One end of the suspended pressure level gauge is located at the bottom of the tank, and the other end is located outside the tank, which reduces the airtightness and thermal insulation of the low-temperature storage tank, and is prone to frost at the joints inside and outside the tank, resulting in a shorter service life;

[0005] 2. Float level gauges are mostly used in self-pressurizing cryogenic storage tanks. They increase the pressure inside the tank to achieve automatic discharge of the cryogenic medium. However, during the pressurization process, air needs to be injected into the tank. The water vapor in the air will frost on the float, causing the float level gauge to lose accuracy or even fail.

[0006] Therefore, how to accurately measure the dynamic liquid level of the cryogenic storage tank has become an urgent problem to be solved. Summary of the invention

[0007] The object of the present invention is to provide a liquid level measuring instrument for a cryogenic storage tank to solve the above-mentioned problem.

[0008] The present invention is achieved through the following technical solutions:

[0009] A liquid level measuring instrument for a cryogenic storage tank comprises a superconductor float, a magnet track, a float position measuring device and a display device.

[0010] The superconductor float is locked by the magnetic flux of the magnet track, the magnet track is fixed on the display device, the float position measuring device is respectively installed on the conductor float and the magnet track, and the float position measuring device is connected with the display device signal to display the liquid level information.

[0011] The cryogenic storage tank in the present invention refers to a cryogenic storage tank for a medium whose liquid temperature is lower than minus 145 degrees. The superconductor in the superconductor float of the present invention is made of a superconducting material in the prior art, and the material can be adjusted according to the temperature in the cryogenic storage tank;

[0012] In the present invention, the flux locking effect of the superconductor in the magnetic field is utilized to make the position of the superconductor float controllable while reducing the friction effect caused by fixation or measurement, and also solving the problem of mechanical failure or measurement failure caused by frosting.

[0013] Preferably, the float position measuring device includes a float induction coil and a magnetic sensor, wherein the float induction coil is mounted and fixed on the superconductor float, and the magnetic sensor is mounted and fixed on the magnet track. When the position of the superconductor float changes, the magnetic sensor can obtain the position information of the induction coil.

[0014] The present invention measures the position information of the float by using the mutual induction effect by setting a float induction coil and a magnetic sensor. The principle includes: since the magnetic track will generate a continuous and stable magnetic field, when the liquid level changes, the superconductor float will move, and the float induction coil installed on it will cut the magnetic flux lines to generate an induced electromotive force, and the magnetic sensor can detect the induced electromotive force generated by its float induction coil, thereby realizing contactless measurement of the position of the superconductor float.

[0015] Preferably, the float position measuring device further comprises a telescopic wire, wherein a fixed end of the telescopic wire is fixedly connected to the float induction coil, a movable end of the telescopic wire is movably connected to the magnetic sensor, a groove is provided on the magnetic sensor, any magneto-electric induction element is provided with a pin for connecting to the telescopic wire at the groove, the movable end of the telescopic wire is installed in the groove and contacts with the pin, and the counterweight is arranged so that the distance from the float induction coil to the magnetic sensor is closer than the distance from the superconductor to the magnetic sensor.

[0016] For some scenarios that require precise measurement, the accuracy of contactless measurement cannot meet the requirements. Therefore, the present application sets up a telescopic wire. Since the change in the distance of the superconductor float relative to the magnet track is very small, the float induction coil is connected to the magnetic sensor by setting up the telescopic wire. When an induced electromotive force is generated in the float induction coil, an induced current is also generated. The induced current is directly received by the magnetic sensor through the telescopic wire, thereby increasing the accuracy of the liquid level measurement.

[0017] Preferably, the superconductor float includes a superconductor and a counterweight, wherein the superconductor is mounted and fixed on the counterweight, and the counterweight is a hollow sealed body. When the superconductor and the counterweight are installed, the ratio of their mass to volume, that is, their relative density, is less than the density of the medium in the cryogenic storage tank.

[0018] Since the material density of superconductors is usually large, counterweights are required to reduce their relative density. The present application solves this problem by providing a hollow sealing body to adjust the relative density of the superconductor float to be less than the density of the medium in the cryogenic storage tank.

[0019] Preferably, the float induction coil is mounted and fixed on the counterweight, wherein the superconductor is embedded in the counterweight, and the float induction coil is mounted and fixed on the side of the counterweight on which the superconductor is mounted.

[0020] Since the electromotive force generated by the float induction coil is small, the float induction coil is installed on the counterweight in the present application and is closer to the magnetic sensor, thereby increasing the detection accuracy.

[0021] Preferably, the magnet track includes a permanent magnet and a fixed component, the permanent magnet is a cuboid, and the length of the permanent magnet is the vertical distance from the mouth of the low-temperature storage tank to the bottom of the bottle;

[0022] The fixing assembly includes a fixing rod, a base, and a fixing block. The base is installed and fixed on the bottom surface of the low-temperature storage tank. One end of the fixing rod is installed and fixed at the upper position in the low-temperature storage tank, and the other end of the fixing rod is installed and fixed on the base. One end of the fixing block is installed and fixed on the fixing rod, and the other end of the fixing block is used to install a permanent magnet, and the permanent magnet is vertical relative to the bottom of the bottle of the low-temperature storage tank.

[0023] The present application provides a fixing rod, and installs the magnet track on the fixing rod through a fixing block. A base is provided at the bottom of the cryogenic storage tank, and the fixing rod is installed therein, so that the stability of the fixing rod is ensured. Even during transportation or handling, the magnet track can be ensured to be relatively vertical to the bottom of the cryogenic storage tank.

[0024] Preferably, the permanent magnets in the magnet track are detachably mounted on the fixing assembly, the fixing blocks are permanent magnet blocks, and the number of the fixing blocks is at least two.

[0025] Since frost may form on the magnet track during use, when the frost affects the use of the float, it needs to be removed for processing. Therefore, the present application sets the fixed block as a permanent magnet and realizes the detachable connection of the magnet track by magnetic attraction. At least two fixed blocks are set to ensure the accuracy of the position of the magnet track after installation and ensure the verticality of the magnet track.

[0026] Preferably, the magnetic sensor includes a plurality of magneto-electric induction elements and an integrated board. The size of the magneto-electric induction elements corresponds to the accuracy required by the liquid level meter. The magneto-electric induction elements are evenly distributed on the integrated board. A groove for installing the telescopic wire is provided on the integrated board. Any magneto-electric induction element is provided with a pin at the groove for connecting to the telescopic wire.

[0027] In order to increase the measurement accuracy, the present application sets a number of magnetoelectric induction elements on the integrated board. The magnetoelectric induction elements are sensors that can sense changes in the surrounding magnetic field and current. When the float induction coil generates an induced electromotive force or transfers current to the magnetoelectric induction element through a telescopic wire, the position of the superconductor float can be obtained by determining the position of the magnetoelectric induction element that receives the electromotive force or current. Therefore, the size of the existing smaller magnetoelectric induction elements is 0.1mm-0.3mm, which can fully meet the measurement accuracy requirements of cryogenic storage tanks.

[0028] Preferably, the display device includes a sealing ring, a magnetoelectric signal processing module and a display screen, wherein the magnetoelectric signal processing module and the display screen are both installed and fixed in the sealing ring, wherein the upper end of the sealing ring is sealed and connected to the lid of the cryogenic storage tank, and the lower end of the sealing ring is sealed and connected to the tank mouth of the cryogenic storage tank, and a connecting interface is provided at the inner ring of the sealing ring, and the connecting interface is connected to the magnetic sensor for collecting data from the magnetic sensor and sending the collected data to the magnetoelectric signal processing module, and the magnetoelectric signal processing module processes the real-time data and sends it to the display screen to display the liquid level in the cryogenic storage tank in real time.

[0029] In the prior art, a liquid level gauge usually requires a groove at the mouth of the bottle so that the display device can extend from the bottle. However, at the interface of the groove, not only will the thermal insulation performance be reduced, but it will also cause damage during frequent opening and closing of the lid. The present application provides a sealing ring and integrates the magnetoelectric signal processing module and the display screen in the sealing ring, which is equivalent to raising the bottle mouth, and the lid of the low-temperature storage tank can be directly covered on the upper end of the sealing ring.

[0030] Preferably, the counterweight comprises a plurality of splicing blocks, wherein the splicing blocks are hollow and provided with connecting buckles for connecting adjacent connecting blocks;

[0031] The counterweight also includes an induction splicing block for mounting the float induction coil, and each induction splicing block is mounted with a complete float induction coil.

[0032] The present application sets the counterweight in the form of multiple smaller splicing blocks, which solves the problem of difficulty in adjusting relative density. Since the cryogenic storage tank contains more than one liquid, when replacing other liquids, the density can be adjusted by adding or reducing splicing blocks, thereby increasing the usability of the liquid level meter of the present application.

[0033] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0034] The design of this level meter makes full use of the flux locking effect of superconductors in a magnetic field to achieve accurate, contactless measurement of the liquid level. Through the interaction between the superconductor float and the magnetic sensor, the meter can work stably at extremely low temperatures and is not affected by environmental factors such as frost. The application of telescopic wires further improves the measurement accuracy, making it suitable for scenarios that require high-precision measurements. The design of the display device not only ensures the thermal insulation performance of the cryogenic storage tank, but also provides an intuitive liquid level display. The adjustability of the counterweight enables the meter to adapt to different media, increasing its applicability in different application scenarios. In general, the level meter, with its high precision, high stability and high adaptability, provides an innovative solution for liquid level measurement in cryogenic storage tanks. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The drawings described herein are used to provide a further understanding of the embodiments of the present invention, constitute a part of this application, and do not constitute a limitation of the embodiments of the present invention. In the drawings:

[0036] Figure 1 It is a structural schematic diagram of Example 1;

[0037] Figure 2 It is a partial enlarged view of Example 1;

[0038] Figure 3 is a partial enlarged view of the display device of the present invention;

[0039] Figure 4 It is a structural schematic diagram of Example 2;

[0040] Figure 5 This is a partial enlarged view of Example 2.

[0041] Marks and corresponding parts names in the attached drawings:

[0042] 1-superconductor float, 11-superconductor, 12-counterweight, 2-magnet track, 21-permanent magnet, 22-fixed rod, 23-base, 24-fixed block, 3-float position measuring device, 31-float induction coil, 32-magnetic sensor, 321-magnetoelectric induction element, 322-integrated board, 33-telescopic wire, 4-display device, 41-sealing ring, 42-magnetoelectric signal processing module, 43-display screen, 5-cryogenic storage tank. DETAILED DESCRIPTION

[0043] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with the embodiments. The schematic implementation mode of the present invention and its description are only used to explain the present invention and are not intended to limit the present invention. The embodiments described below are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present invention.

[0044] In the following description, a large number of specific details are set forth in order to provide a thorough understanding of the present invention. However, it is apparent to those of ordinary skill in the art that these specific details do not have to be employed to practice the present invention. In other embodiments, in order to avoid confusing the present invention, known structures, materials or methods are not specifically described. The materials, instruments and reagents used in the following examples, unless otherwise specified, can be obtained from commercial sources. The technical means used in the examples, unless otherwise specified, are conventional means well known to those skilled in the art.

[0045] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0046] Embodiment 1:

[0047] like Figure 1-Figure 3 As shown, in order to solve the above problems, this embodiment provides a liquid level measuring instrument for a cryogenic storage tank, including a superconductor float 1, a magnet track 2, a float position measuring device 3 and a display device 4.

[0048] The superconductor float 1 is magnetically locked by the magnetic track 2, which is fixed on the display device 4. The float position measuring device 3 is respectively installed on the conductor float and the magnetic track 2, and the float position measuring device 3 is signal-connected with the display device 4 to display the liquid level information.

[0049] The cryogenic storage tank 5 in this embodiment is a cryogenic storage tank 5 for storing liquid nitrogen. The superconductor 11 in the superconductor float 1 in this embodiment is lead.

[0050] It is understood that the superconductor float 1 is a float made of superconducting material, which can achieve a flux locking effect in a magnetic field. The superconductor 11 exhibits zero resistance and complete anti-magnetism under specific low temperature conditions, namely the Meissner effect. In the liquid level measuring instrument of the present application, the superconductor float 1 measures the liquid level change by interacting with the magnetic track 2, achieving precise control of the float position while reducing the influence of friction;

[0051] In addition, the flux locking effect, also known as the flux pinning effect, refers to the phenomenon that the superconductor 11 can "lock" or "lock" the magnetic flux lines in the magnetic field. When the superconductor 11 is in the superconducting state, any magnetic flux passing through the superconductor 11 will remain constant, even if the external magnetic field changes. This effect makes the position of the superconductor float 1 in the magnetic field controllable and is one of the key technologies for achieving accurate measurement in the liquid level measuring instrument.

[0052] The display device 4 in this embodiment refers to a device for displaying information, which can be an electronic screen or other visual output device. In the liquid level measuring instrument, the display device 4 is used to display the liquid level height in the cryogenic storage tank 5 in real time. The display device 4 processes the data collected by the magnetic sensor 32 and displays the liquid level information to the user in an intuitive manner.

[0053] In this embodiment, the flux locking effect of the superconductor 11 in the magnetic field is utilized to make the position of the superconductor float 1 controllable while reducing the friction caused by fixation or measurement, and also solving the problem of mechanical failure or measurement failure caused by frost.

[0054] In this embodiment, the float position measuring device 3 includes a float induction coil 31 and a magnetic sensor 32, wherein the float induction coil 31 is installed and fixed on the superconductor float 1, and the magnetic sensor 32 is installed and fixed on the magnet track 2. When the position of the superconductor float 1 changes, the magnetic sensor 32 can obtain the position information of the induction coil.

[0055] The present invention measures the position information of the float by using the mutual induction effect by setting a float induction coil 31 and a magnetic sensor 32. The principle is as follows: since the magnetic track 2 will generate a continuous and stable magnetic field, when the liquid level changes, the superconductor float 1 will move, and the float induction coil 31 installed thereon will cut the magnetic flux lines to generate an induced electromotive force, and the magnetic sensor 32 can detect the induced electromotive force generated by the float induction coil 31, thereby realizing contactless measurement of the position of the superconductor float 1.

[0056] In this embodiment, the superconductor float 1 includes a superconductor 11 and a counterweight 12, wherein the superconductor 11 is installed and fixed on the counterweight 12, and the counterweight 12 is a hollow sealed body. When the superconductor 11 and the counterweight 12 are installed, the ratio of their mass to volume, that is, their relative density, is less than the density of the medium in the cryogenic storage tank 5.

[0057] Since the material density of the superconductor 11 is usually large, a counterweight 12 is required to reduce its relative density. The present application solves this problem by providing a hollow sealing body to adjust the relative density of the superconductor float 1 to be less than the density of the medium in the cryogenic storage tank 5.

[0058] In this embodiment, the float induction coil 31 is mounted and fixed on the counterweight 12 , wherein the superconductor 11 is embedded in the counterweight 12 , and the float induction coil 31 is mounted and fixed on the side of the counterweight 12 where the superconductor 11 is mounted.

[0059] Since the electromotive force generated by the float induction coil 31 is relatively small, the present application installs the float induction coil 31 on the counterweight 12 and is closer to the magnetic sensor 32, thereby increasing the detection accuracy.

[0060] In this embodiment, the magnet track 2 includes a permanent magnet 21 and a fixing assembly. The permanent magnet 21 is a rectangular parallelepiped, and the length of the permanent magnet 21 is the vertical distance from the mouth of the low-temperature storage tank 5 to the bottom of the bottle;

[0061] The fixing assembly includes a fixing rod 22, a base 23, and a fixing block 24. The base 23 is installed and fixed on the bottom surface of the low-temperature storage tank 5. One end of the fixing rod 22 is installed and fixed at the upper position inside the low-temperature storage tank 5, and the other end of the fixing rod 22 is installed and fixed on the base 23. One end of the fixing block 24 is installed and fixed on the fixing rod 22, and the other end of the fixing block 24 is used to install the permanent magnet 21, and make the permanent magnet 21 vertical relative to the bottom of the bottle of the low-temperature storage tank 5.

[0062] The present application provides a fixing rod 22, and installs the magnet track 2 on the fixing rod 22 through a fixing block 24, and provides a base 23 at the bottom of the cryogenic storage tank 5 and installs the fixing rod 22 therein, thereby ensuring the stability of the fixing rod 22, and even during transportation or handling, the magnet track 2 can be ensured to be relatively vertical to the bottom of the cryogenic storage tank 5.

[0063] In this embodiment, the permanent magnet 21 in the magnet track 2 is detachably mounted on the fixing assembly, the fixing block 24 is a permanent magnet block, and the number of the fixing blocks 24 is at least two.

[0064] Since frost may form on the magnet track 2 during use, when the frost affects the use of the float, it needs to be removed for processing. Therefore, the present application sets the fixed block 24 as a permanent magnet block and realizes the detachable connection of the magnet track 2 by magnetic attraction. At least two fixed blocks 24 are set to ensure the accuracy of the position of the magnet track 2 after installation and ensure the verticality of the magnet track 2.

[0065] In this embodiment, the display device 4 includes a sealing ring 41, a magnetoelectric signal processing module 42 and a display screen 43, wherein the magnetoelectric signal processing module 42 and the display screen 43 are both installed and fixed in the sealing ring 41, wherein the upper end of the sealing ring 41 is sealed and connected to the lid of the low-temperature storage tank 5, and the lower end of the sealing ring 41 is sealed and connected to the tank mouth of the low-temperature storage tank 5. A connection interface is provided at the inner circle of the sealing ring 41, and the connection interface is connected to the magnetic sensor 32 for collecting data from the magnetic sensor 32 and sending the collected data to the magnetoelectric signal processing module 42. The magnetoelectric signal processing module 42 processes the real-time data and sends it to the display screen 43 to display the liquid level in the low-temperature storage tank 5 in real time.

[0066] In the prior art, a liquid level gauge usually requires a groove to be provided at the mouth of the bottle so that the display device 4 can extend from the bottle. However, at the interface of the groove, not only will the thermal insulation performance be reduced, but it will also be damaged during frequent opening and closing of the lid. The present application provides a sealing ring 41, and integrates the magnetoelectric signal processing module 42 and the display screen 43 in the sealing ring 41, which is equivalent to raising the bottle mouth, and the lid of the low-temperature storage tank 5 can be directly covered on the upper end of the sealing ring 41.

[0067] In this embodiment, the counterweight 12 includes a plurality of splicing blocks, each of which is hollow and has connecting buckles provided on the splicing blocks for connecting adjacent connecting blocks;

[0068] The counterweight 12 also includes an induction splicing block on which the float induction coil 31 is installed, and a complete float induction coil 31 is installed on each induction splicing block.

[0069] The present application sets the counterweight 12 in the form of a plurality of smaller splicing blocks for splicing, thereby solving the problem of difficulty in adjusting relative density. Since the cryogenic storage tank 5 contains more than one liquid, when replacing other liquids, the density can be adjusted by adding or reducing splicing blocks, thereby increasing the usability of the liquid level meter of the present application.

[0070] Embodiment 2;

[0071] according to Figure 4-Figure 5As shown, on the basis of Example 1, the magnetic inductive sensor 32 includes a plurality of magneto-electric inductive elements 321 and an integrated board 322. The size of the magneto-electric inductive elements corresponds to the accuracy required by the liquid level meter. The magneto-electric inductive elements are evenly distributed on the integrated board 322. A groove for installing the telescopic wire 33 is provided on the integrated board 322. Any magneto-electric inductive element 321 is provided with a pin for connecting with the telescopic wire 33 at the groove.

[0072] In order to increase the measurement accuracy, the present application sets a plurality of magnetoelectric induction elements 321 on the integrated board 322. The magnetoelectric induction element 321 is a sensor that can sense changes in the surrounding magnetic field and current. When the float induction coil 31 generates an induced electromotive force or transfers current to the magnetoelectric induction element 321 through the telescopic wire 33, the position of the superconductor float 1 can be obtained by determining the position of the magnetoelectric induction element 321 that receives the electromotive force or current. The size of the existing smaller magnetoelectric induction element 321 is 0.1mm-0.3mm, which can fully meet the measurement accuracy requirements of the cryogenic storage tank 5.

[0073] The float position measuring device 3 also includes a telescopic wire 33, wherein the fixed end of the telescopic wire 33 is fixedly connected to the float induction coil 31, and the movable end of the telescopic wire 33 is movably connected to the magnetic sensor 32. A groove is provided on the magnetic sensor 32, and any magneto-electric induction element 321 is provided with a pin for connecting with the telescopic wire 33 at the groove. The movable end of the telescopic wire 33 is installed in the groove and contacts with the pin, and the counterweight 12 is arranged so that the distance from the float induction coil 31 to the magnetic sensor 32 is closer than the distance from the superconductor 11 to the magnetic sensor 32.

[0074] It is understandable that the telescopic wire 33 is a wire that can be stretched and retracted, which allows a certain degree of free movement while maintaining the connection of the circuit. In the liquid level measuring instrument, the telescopic wire 33 connects the float induction coil 31 and the magnetic sensor 32, so that when the float induction coil 31 generates an induced electromotive force, the induced current can be directly transmitted to the magnetic sensor 32 through the telescopic wire 33, thereby increasing the accuracy of the liquid level measurement. The telescopic wire provides a physical connection so that the induced current can be directly transmitted from the float induction coil to the magnetic sensor, reducing the measurement error caused by the change in the distance between the float induction coil and the magnetic sensor, thereby improving the stability of the signal and the accuracy of the measurement. Since the telescopic wire directly connects the float induction coil and the magnetic sensor, the loss of the induced current during the transmission process is small, and the signal strength is maintained, which helps the magnetic sensor to more accurately detect the induced electromotive force generated by the float induction coil.

[0075] For some scenarios that require precise measurement, the accuracy of contactless measurement cannot meet the requirements. Therefore, the present application sets up a telescopic wire 33. By setting up the telescopic wire 33, the float induction coil 31 is connected to the magnetic sensor 32. When an induced electromotive force is generated in the float induction coil 31, an induced current is also generated. The induced current is directly received by the magnetic sensor 32 through the telescopic wire 33, thereby increasing the accuracy of liquid level measurement.

[0076] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

[0077] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention, so they have no substantial technical significance. Any modification of the structure, change of the proportional relationship or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the effects and purposes that can be achieved by the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and the like cited in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the present invention. The change or adjustment of the relative relationship should also be regarded as the scope of the implementation of the present invention without substantially changing the technical content.

Claims

1. A liquid level measuring instrument for a cryogenic storage tank, characterized in that: It comprises a superconductor float (1), a magnetic track (2), a float position measuring device (3) and a display device (4); The superconductor float (1) is locked by the magnetic flux of the magnetic track (2), the magnetic track (2) is fixedly mounted on the display device (4), the float position measuring device (3) is respectively mounted on the conductor float and the magnetic track (2), and the float position measuring device (3) is signal-connected to the display device (4) to display the liquid level information; The float position measuring device (3) comprises a float induction coil (31) and a magnetic sensor (32), wherein the float induction coil (31) is mounted and fixed on the superconductor float (1), and the magnetic sensor (32) is mounted and fixed on the magnet track (2), and when the position of the superconductor float (1) changes, the magnetic sensor (32) can obtain the position information of the induction coil; The float position measuring device (3) further comprises a telescopic wire (33), wherein a fixed end of the telescopic wire (33) is fixedly connected to the float induction coil (31), a movable end of the telescopic wire (33) is movably connected to the magnetic sensor (32), a groove is provided on the magnetic sensor (32), any magnetic induction element (321) is provided with a pin for connecting to the telescopic wire (33) at the groove, the movable end of the telescopic wire (33) is installed in the groove and contacts the pin, and the counterweight (12) is arranged so that the distance from the float induction coil (31) to the magnetic sensor (32) is closer than the distance from the superconductor (11) to the magnetic sensor (32); The superconductor float (1) comprises a superconductor (11) and a counterweight (12), wherein the superconductor (11) is mounted and fixed on the counterweight (12), and the counterweight (12) is a hollow sealed body. When the superconductor (11) and the counterweight (12) are mounted, the ratio of their mass to volume, that is, their relative density, is less than the density of the medium in the cryogenic storage tank (5); The float induction coil (31) is mounted and fixed on the counterweight (12), wherein the superconductor (11) is embedded in the counterweight (12), and the float induction coil (31) is mounted and fixed on the side of the counterweight (12) on which the superconductor (11) is mounted; The magnet track (2) comprises a permanent magnet (21) and a fixing assembly, wherein the permanent magnet (21) is a rectangular parallelepiped, and the length of the permanent magnet (21) is the vertical distance from the bottle mouth to the bottle bottom of the low-temperature storage tank (5); The fixing assembly comprises a fixing rod (22), a base (23), and a fixing block (24); the base (23) is fixedly mounted on the inner bottom surface of the cryogenic storage tank (5); one end of the fixing rod (22) is fixedly mounted at an upper position in the cryogenic storage tank (5); the other end of the fixing rod (22) is fixedly mounted on the base (23); one end of the fixing block (24) is fixedly mounted on the fixing rod (22); and the other end of the fixing block (24) is used for mounting a permanent magnet (21) so that the permanent magnet (21) is perpendicular to the bottom of the cryogenic storage tank (5).

2. A liquid level measuring instrument for a cryogenic storage tank according to claim 1, characterized in that: The permanent magnet (21) in the magnet track (2) is detachably mounted on the fixing assembly, the fixing block (24) is a permanent magnet block, and the number of the fixing blocks (24) is at least two.

3. A liquid level measuring instrument for a cryogenic storage tank according to claim 2, characterized in that: The magnetic induction sensor (32) comprises a plurality of magnetic induction elements (321) and an integrated board (322). The size of the magnetic induction elements corresponds to the accuracy required by the liquid level meter. The magnetic induction elements are evenly distributed on the integrated board (322). A groove for installing the telescopic wire (33) is provided on the integrated board (322). Any magnetic induction element (321) is provided with a pin at the groove for connecting to the telescopic wire (33).

4. A liquid level measuring instrument for a cryogenic storage tank according to claim 3, characterized in that: The display device (4) comprises a sealing ring (41), a magnetoelectric signal processing module (42) and a display screen (43), wherein the magnetoelectric signal processing module (42) and the display screen (43) are both installed and fixed in the sealing ring (41), wherein the upper end of the sealing ring (41) is sealed and connected to the lid of the low-temperature storage tank (5), and the lower end of the sealing ring (41) is sealed and connected to the tank opening of the low-temperature storage tank (5). A connection interface is provided at the inner ring of the sealing ring (41), and the connection interface is connected to the magnetic sensor (32) for collecting data from the magnetic sensor (32) and sending the collected data to the magnetoelectric signal processing module (42). The magnetoelectric signal processing module (42) processes the real-time data and sends it to the display screen (43), so as to display the liquid level in the low-temperature storage tank (5) in real time.

5. A liquid level measuring instrument for a cryogenic storage tank according to claim 4, characterized in that: The counterweight (12) comprises a plurality of splicing blocks, wherein the splicing blocks are hollow and are provided with connecting buckles for connecting adjacent connecting blocks; The counterweight (12) further comprises an induction splicing block on which the float induction coil (31) is mounted, and each induction splicing block is mounted with a complete float induction coil (31).

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