A cryogenic liquid level monitoring device and method

Abstract

The application discloses a low-temperature liquid liquid level monitoring device and a monitoring method, and relates to the technical field of liquid level monitoring.The application comprises a liquid storage container and a liquid level sensor, the liquid level sensor comprises a superconducting metal body, a connecting rod and a wire, the superconducting metal body is made of superconducting material (such as Tl2Ba2CuO6 (Ti-2201)) with a critical temperature of-196 DEG C plus or minus 5 DEG C; the superconducting metal body is vertically arranged in the liquid storage container, and the superconducting metal body extends from the highest point to the lowest point in the liquid storage container, thereby realizing full-range measurement of the liquid level in the liquid storage container.The application vertically arranges the liquid level sensor in the liquid storage container, the liquid level sensor comprises a superconducting metal body, the low-temperature superconducting characteristics of the superconducting material are utilized, the material for the liquid level sensor in the market is replaced, the superconducting metal body extends from the highest point to the lowest point in the liquid storage container, thereby realizing full-range measurement of the liquid level in the liquid storage container, and the failure rate is greatly reduced.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of liquid level monitoring, in particular to a low-temperature liquid level monitoring device and a monitoring method. BACKGROUND

[0002] Liquid nitrogen container is a container filled with liquid nitrogen, which has various purposes, such as storing liquid nitrogen, transporting liquid nitrogen, and cryopreserving biological tissues. Most of the existing liquid nitrogen storage containers need to monitor the liquid level of the liquid nitrogen in the container. Since the temperature of liquid nitrogen is extremely low, at least minus one hundred degrees Celsius, the liquid nitrogen container is usually made of stainless steel with a thermal insulation layer, so it is difficult to observe the liquid level by setting a transparent plate on the container wall, and it is also difficult to observe the liquid level from the upper opening.

[0003] Currently, there are two types of sensors for liquid nitrogen level monitoring on the market: differential pressure type and capacitance type. The working principle of the differential pressure type liquid level sensor is to use the pressure difference caused by the liquid level to reflect the liquid level height of the liquid nitrogen in the low-temperature storage tank. However, this monitoring method has two open channels, and the particles condensed by water molecules in the low-temperature state can easily block the pressure sensing port, hindering the pressure sensing and causing inaccurate liquid level measurement. The capacitance type liquid level sensor needs to open two liquid level holes on the top and bottom of the sensor, and the distance between the two liquid level holes determines the range of the liquid level that can be sensed. However, the capacitance type liquid level sensor cannot monitor the liquid level when the liquid level is below the bottom hole, resulting in a blind area and making it impossible to monitor the full liquid level height. SUMMARY

[0004] The present application aims to provide a low-temperature liquid level monitoring device that can measure the full range of liquid level in the liquid storage container by vertically arranging a liquid level sensor inside the container, which includes a superconducting metal body that extends from the highest point to the lowest point in the container, solving the problem of inaccurate measurement of the differential pressure type liquid level sensor and the blind area of the capacitance type liquid level sensor, which cannot monitor the full liquid level height. Another purpose of the present application is to provide a monitoring method for a low-temperature liquid level monitoring device.

[0005] To solve the above technical problems, the present application is achieved by the following technical solutions:

[0006] The present application is a low-temperature liquid level monitoring device, which includes a liquid storage container and a liquid level sensor. The liquid level sensor includes a superconducting metal body, a connecting rod, and a wire. The superconducting metal body is made of superconducting material. The superconducting metal body is vertically arranged in the liquid storage container and extends from the highest point to the lowest point in the container, achieving full-range measurement of the liquid level in the container.

[0007] As a preferred technical scheme of the present application, the top of the liquid storage container is provided with a neck pipe, the superconducting metal body is arranged in the liquid storage container through the neck pipe, and the connecting rod is fixedly connected with the neck pipe.

[0008] As a preferred technical scheme of the present application, the superconducting metal body is made of superconducting material with a critical temperature of-196℃±5℃.

[0009] As a preferred technical scheme of the present application, the superconducting metal body is made of Tl2Ba2CuO6 (Ti-2201).

[0010] A monitoring method of a low-temperature liquid level monitoring device, the resistivity calculation formula of the superconducting material is: ρ=ρL(T)+ρR. Wherein, ρL(T) represents the resistivity caused by the scattering of electron by the lattice thermal vibration, which is related to temperature, the lower the temperature, the lower the ρL(T) ; ρR is called residual resistivity, which represents the resistivity caused by the scattering of electron by impurities and defects, which is independent of temperature; with the decrease of temperature, the resistivity of the material tends to be the residual resistivity.

[0011] The calculation formula of the resistivity is: R is the resistance value, S is the cross-sectional area of the material, and L is the length of the material. When the superconducting metal body is placed in the solution, the length of the superconducting metal body in the solution is l1, and the resistance of this part tends to be 0; the length of the superconducting metal body extending out of the solution is l2, at this time, the calculation formula of the resistivity of the superconducting metal body is: That is Get l1 is the liquid level of the liquid.

[0012] The present application has the following beneficial effects:

[0013] The present application vertically arranges a liquid level sensor in the liquid storage container, the liquid level sensor comprises a superconducting metal body, the superconducting metal body is made of superconducting material with a critical temperature of-196℃, such as Tl2Ba2CuO6 (Ti-2201), the low-temperature superconducting characteristics of the superconducting material are used to replace the material for liquid level sensor in the market, the superconducting metal body extends from the highest place to the lowest place in the liquid storage container, full-range measurement of the liquid level in the liquid storage container is realized, and the failure rate is greatly reduced.

[0014] Of course, any product implementing the present application does not necessarily need to achieve all the advantages described above at the same time. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the description of the embodiments will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative effort.

[0016] Fig. 1 A structure diagram of a low-temperature liquid level monitoring device of the present application;

[0017] Fig. 2 A structure diagram of a liquid level sensor;

[0018] In the drawings, the components represented by each number are listed as follows:

[0019] 1-liquid storage container, 101-neck pipe, 2-liquid level sensor, 201-superconducting metal body, 202-connecting rod, 203-wire. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present application.

[0021] In the description of the present application, it should be understood that the terms "opening", "upper", "lower", "thickness", "top", "middle", "length", "inner", "periphery" and the like indicate the orientation or positional relationship, which are only used to facilitate the description of the present application and simplify the description, and do not indicate or imply that the referred components or elements must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0022] Please refer to Figs. 1-2The embodiment shown provides a low-temperature liquid level monitoring device, mainly used for storing liquid nitrogen. The liquid level monitoring device comprises a liquid storage container 1 and a liquid level sensor 2, and the liquid level sensor 2 comprises a superconducting metal body 201, a connecting rod 202 and a wire 203. The superconducting metal body 201 is made of superconducting material (superconducting refers to the phenomenon that the resistance of some objects suddenly tends to zero when the temperature drops to a certain temperature, and the material with this characteristic is called superconducting material). The temperature at which the superconductor changes from the normal state to the superconducting state is called the transition temperature (or critical temperature) of the substance. In this embodiment, the superconducting metal body 201 is made of Tl2Ba2CuO6 (Ti-2201), and its critical temperature is -196℃, while the temperature of liquid nitrogen is also -196℃. When the superconducting metal body 201 is placed in liquid nitrogen, it can be converted into a superconducting state.

[0023] When installed, the superconducting metal body 201 is inserted into the liquid storage container 1 vertically downward through the neck pipe 101 at the top of the liquid storage container 1, so that the superconducting metal body 201 extends from the highest point to the lowest point in the liquid storage container 1, realizing full-range measurement of the liquid level in the liquid storage container 1. Then the connecting rod 202 is fixed at the neck pipe 101 by bolts, and finally the wire 203 is connected with an external processor. By using the low-temperature superconducting characteristics of the superconducting metal body 201, the material for the existing liquid level sensor in the market can be replaced, the full-range measurement of the liquid level in the liquid storage container can be realized, and the failure rate can be greatly reduced.

[0024] The embodiment also provides a monitoring method of the low-temperature liquid level monitoring device, which is specifically as follows.

[0025] The resistivity calculation formula of the superconducting material is: ρ = ρL(T) + ρR;

[0026] Wherein, ρL(T) represents the resistivity caused by the scattering of electron by the thermal vibration of the crystal lattice, which is related to the temperature. The lower the temperature is, the lower ρL(T) is. ρR is called residual resistivity, which represents the resistivity caused by the scattering of electron by impurities and defects, and is independent of temperature. With the decrease of temperature, the resistivity of the material tends to the residual resistivity.

[0027] The calculation formula of the resistivity is: R is the resistance value, S is the cross-sectional area of the material, and L is the length of the material.

[0028] When the superconducting metal body 201 is placed in the solution, the length of the superconducting metal body 201 in the solution is l1, and the resistance of this part tends to 0; the length of the superconducting metal body 201 out of the solution is l2, and at this time, the calculation formula of the resistivity of the superconducting metal body 201 is:

[0029] That is Get

[0030] I1 is the liquid level of the liquid.

[0031] In the description of the present specification, the description referring to the terms "one embodiment", "an example", "a specific example" and the like means that the specific feature, structure, material or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In the present specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Also, the specific feature, structure, material or characteristic described can be combined in any appropriate way in one or more embodiments or examples.

[0032] The preferred embodiments of the application disclosed above are only used to help explain the present application. The preferred embodiments do not describe all of the details of the application and limit the application to the specific embodiments described. Obviously, many modifications and variations of the application can be made in light of the teachings above. The present specification selects and specifically describes these embodiments in order to better explain the principles and practical application of the application, so that those skilled in the art can well understand and utilize the application. The application is limited only by the claims and their full scope and equivalents.

Claims

1. A cryogenic liquid level monitoring device, characterized in that, include: A liquid storage container (1) and a liquid level sensor (2), wherein the liquid level sensor (2) includes a superconducting metal body (201), a connecting rod (202) and a wire (203), wherein the superconducting metal body (201) is made of a superconducting material; the superconducting metal body (201) is made of a superconducting material with a critical temperature of -196℃±5℃; the superconducting material is Tl2Ba2CuO6 (Ti-2201); The superconducting metal body (201) is vertically arranged inside the liquid storage container (1). The superconducting metal body (201) extends from the highest point to the lowest point inside the liquid storage container (1) to realize the full range measurement of the liquid level inside the liquid storage container (1). The top of the liquid storage container (1) is provided with a neck tube (101), the superconducting metal body (201) passes through the neck tube (101) and is disposed inside the liquid storage container (1), and the connecting rod (202) is fixedly connected to the neck tube (101). The formula for calculating the resistivity of the superconducting material is as follows: ; in, Resistivity, representing the resistivity caused by electron scattering due to lattice thermal vibrations, is temperature-dependent; the lower the temperature, the higher the resistivity. The lower; It is called residual resistivity, which represents the resistivity caused by the scattering of electrons by impurities and defects, and is independent of temperature; as the temperature decreases, the resistivity of the material approaches the residual resistivity. The formula for calculating resistivity is: R is the resistance value, S is the cross-sectional area of ​​the material, and L is the length of the material; When the superconducting metal body (201) is placed in the solution, the length of the superconducting metal body (201) in the solution is The resistance of this part approaches 0; the length of the superconducting metal (201) extending out of the solution is... At this point, the formula for calculating the resistivity of the superconducting metal (201) is: , Right now ,have to =L- =L- ; This refers to the liquid level.

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