CN111947027B - Low-temperature liquefied gas level measuring method - Google Patents
Low-temperature liquefied gas level measuring method Download PDFInfo
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- CN111947027B CN111947027B CN202010762980.4A CN202010762980A CN111947027B CN 111947027 B CN111947027 B CN 111947027B CN 202010762980 A CN202010762980 A CN 202010762980A CN 111947027 B CN111947027 B CN 111947027B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C13/00—Details of vessels or of the filling or discharging of vessels
- F17C13/02—Special adaptations of indicating, measuring, or monitoring equipment
- F17C13/021—Special adaptations of indicating, measuring, or monitoring equipment having the height as the parameter
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C13/00—Details of vessels or of the filling or discharging of vessels
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C13/00—Details of vessels or of the filling or discharging of vessels
- F17C13/06—Closures, e.g. cap, breakable member
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- General Engineering & Computer Science (AREA)
- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
The invention belongs to the technical field of low-temperature liquefied gas, and particularly relates to a low-temperature liquefied gas liquid level measuring method which comprises the following steps: providing a mounting rod and a plurality of temperature sensors, and sequentially mounting the temperature sensors on the outer wall of the mounting rod from bottom to top; holding the upper end of the installation rod, installing the installation rod in the low-temperature liquefied gas in a way that the installation rod is vertical to the liquid level of the low-temperature liquefied gas, and standing for a period of time to keep the installation rod and the liquid level of the low-temperature liquefied gas relatively stable; each temperature sensor transmits the measured temperature value to a display processor, and the display processor calculates the temperature difference value of two adjacent temperature sensors; the temperature difference of the low-temperature liquefied gas in the gas state and the liquid state and the temperature change rule of the temperature in the gas phase space and the liquid phase space respectively are utilized to find out the numerical value of the temperature difference and the numerical value of the temperature change mutation, the liquid level height of the low-temperature liquefied gas is judged according to the height calibrated by the temperature sensor at the temperature change mutation position, and the measurement accuracy is high.
Description
Technical Field
The invention belongs to the technical field of low-temperature liquefied gases, and particularly relates to a low-temperature liquefied gas liquid level measuring method.
Background
The low-temperature liquid level sensor is used for measuring the liquid level height of low-temperature liquid such as liquid nitrogen, plays an important role in low-temperature testing, and is an essential instrument for ensuring normal running of scientific research tests, industrial production and other processes.
At present, there are many methods for measuring the level of cryogenic liquid, mainly including a thermal oscillation method, a super conductor method, a resistance method, a diode method, a capacitance method, and the like. In all the above methods, the purpose of determining the liquid level height is achieved by using the difference between the internal and external electric conductivity or thermal conductivity or resistance and capacitance of the low-temperature liquid, and the defects are as follows: since the above characteristic differences on both sides of the critical liquid surface are limited, it is difficult to make a greater breakthrough in the level measurement accuracy no matter how the sensor itself is changed.
Disclosure of Invention
The invention aims to provide a method for measuring the liquid level of low-temperature liquefied gas, and aims to solve the technical problems that the method for measuring the liquid level of the low-temperature liquid in the prior art has certain limitation and cannot further improve the liquid level measurement precision.
In order to achieve the above object, an embodiment of the present invention provides a method for measuring a liquid level of a cryogenic liquefied gas, including the following steps:
s100: providing an installation rod and a plurality of temperature sensors, and sequentially installing the temperature sensors on the installation rod from bottom to top;
s200: providing a display processor for processing and displaying data transmitted by the plurality of temperature sensors;
s300: holding the upper end of the mounting rod, and mounting the mounting rod in the low-temperature liquefied gas in a manner that the mounting rod is vertical to the liquid level of the low-temperature liquefied gas;
s400: standing for a period of time to keep the installation rod and the liquid level of the low-temperature liquefied gas relatively stable;
s500: switching on a plurality of temperature sensors and the display processor, wherein each temperature sensor transmits the measured temperature value to the display processor to obtain the temperature difference value of two adjacent temperature sensors; the temperature difference of the low-temperature liquefied gas in the gas state and the liquid state and the temperature change rule of the temperature in the gas phase space and the liquid phase space respectively are utilized to find out the numerical value of the temperature difference and the numerical value of the temperature change mutation, and the liquid level height of the low-temperature liquefied gas is judged according to the height calibrated by the temperature sensor at the temperature change mutation position.
Optionally, in the step S300, the mounting rod is placed in the cryogenic liquefied gas in a direction perpendicular to the liquid level of the cryogenic liquefied gas, and the lower end of the mounting rod straightens the bottom of the cryogenic insulation gas cylinder.
Optionally, in the step S300, the standing time is 5S to 20S.
Optionally, in the step S100, the mounting seat of the temperature sensor is provided with a mounting plate, the mounting plates of the temperature sensors are sequentially spirally mounted on the outer wall of the mounting rod from bottom to top, and a longitudinal distance and a radial distance exist between the detection ends of two adjacent temperature sensors.
Optionally, in the step S100, a plurality of adjusting assemblies are further provided, and each adjusting assembly corresponds to one of the temperature sensors; the adjusting assembly comprises a bolt and a nut; the mounting rod is a hollow rod, a plurality of strip-shaped grooves which are longitudinally distributed penetrate through the outer wall of the mounting rod, and each strip-shaped groove corresponds to one temperature sensor; the mounting plate is provided with a mounting hole in a penetrating way;
firstly, the screw rod of the bolt is movably connected with the strip-shaped groove, so that the nut of the bolt is limited in the mounting rod by the strip-shaped groove, then the mounting hole is sleeved on the screw rod of the bolt, then the nut is in threaded connection with the screw rod of the bolt, and finally the nut is screwed up, so that the mounting plate is fixed on the bolt.
Optionally, in the step S100, a notch is formed in the top or the bottom of the strip-shaped groove on the outer wall of the mounting rod, the nut of the bolt penetrates through the notch, and then the screw of the bolt is movably connected to the strip-shaped groove.
Optionally, in the step S100, the longitudinal distance is 0mm to 10 mm.
Optionally, in the step S100, a data interface is further provided; each temperature sensor is provided with a signal transmission line; firstly, a data interface is installed on the top of the installation rod, and then the signal transmission line penetrates through the strip-shaped groove and is electrically connected with the data interface along the inside of the installation rod; in the step S300, the data interface is electrically connected to the display processor through a cable.
Optionally, in step S100, the temperature sensor provided is a platinum resistance temperature sensor.
Optionally, in step S100, a mouth seal is further provided, and the mouth seal is mounted on the upper end of the mounting rod.
Compared with the prior art, the method for measuring the liquid level of the low-temperature liquefied gas provided by the embodiment of the invention has one of the following technical effects: holding the upper end of the mounting rod, mounting the mounting rod in the low-temperature liquefied gas in a manner that the mounting rod is vertical to the liquid level of the low-temperature liquefied gas, and sealing the bottle mouth sealing piece on the bottle mouth of the low-temperature heat-insulation gas cylinder; standing for a period of time to keep the installation rod and the liquid level of the low-temperature liquefied gas relatively stable; switching on a plurality of temperature sensors and the display processor, wherein each temperature sensor transmits the measured temperature value to the display processor to obtain the temperature difference value of two adjacent temperature sensors; the method comprises the steps of finding out a temperature difference value and a temperature change mutation value by utilizing the temperature difference of the low-temperature liquefied gas in a gas state and a liquid state and the temperature change rule of the temperature in a gas phase space and a liquid phase space respectively, and judging the liquid level height of the low-temperature liquefied gas according to the height calibrated by a temperature sensor at the temperature change mutation position, wherein the error is small, the measurement accuracy is high, and the liquid level measurement accuracy of the low-temperature liquefied gas is improved; meanwhile, the structure is simple, and the operation is convenient.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
FIG. 1 is a flow chart of a cryogenic liquefied gas level measurement method of the present invention.
Fig. 2 is a schematic structural diagram of the cryogenic liquefied gas level measurement method of the present invention.
FIG. 3 is a schematic view of the partial structural decomposition of the cryogenic liquefied gas level measurement method of the present invention.
Fig. 4 is a schematic structural view of a temperature sensor of the cryogenic liquefied gas level measurement method of the present invention.
Wherein, in the figures, the respective reference numerals:
the mounting rod 100, the data interface 110, the strip-shaped groove 120, the notch 130, the bottleneck sealing element 140, the temperature sensor 200, the detection end 210, the mounting seat 220, the mounting plate 240, the adjusting assembly 300, the screw 310, the nut 311, the nut 312 and the nut 320.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be illustrative of the embodiments of the present invention, and should not be construed as limiting the invention.
In the description of the embodiments of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the embodiments of the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the embodiments of the present invention, "a plurality" means two or more unless specifically limited otherwise.
In the embodiments of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," "fixed," and the like are to be construed broadly, e.g., as being fixedly connected, detachably connected, or integrated; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. Specific meanings of the above terms in the embodiments of the present invention can be understood by those of ordinary skill in the art according to specific situations.
In the present invention, referring to fig. 1 and 2, there is provided a cryogenic liquefied gas level measurement method comprising the steps of:
s100: providing a mounting rod 100 and a plurality of temperature sensors 200, and sequentially mounting the temperature sensors 200 on the outer wall of the mounting rod 100 from bottom to top;
s200: providing a display processor (not shown) for processing and displaying the data transmitted from the plurality of temperature sensors 200; specifically, a plurality of the temperature sensors 200 are electrically connected to the display processor by cables;
s300: holding the upper end of the installation rod 100, and installing the installation rod 100 in the low-temperature liquefied gas in a way that the installation rod is vertical to the liquid level of the low-temperature liquefied gas;
s400: standing for a period of time to keep the installation rod 100 and the liquid level of the low-temperature liquefied gas relatively stable and ensure that the low-temperature liquefied gas does not shake;
s500: powering on a plurality of temperature sensors 200 and the display processor, and transmitting the measured temperature value to the display processor by each temperature sensor 100 to obtain the temperature difference value between two adjacent temperature sensors 200; the temperature difference of the low-temperature liquefied gas in the gas state and the liquid state and the temperature change rule of the temperature in the gas phase space and the liquid phase space respectively are utilized to find out the numerical value of the temperature difference and the numerical value of the temperature change mutation, the liquid level height of the low-temperature liquefied gas is judged according to the height calibrated by the temperature sensor 200 at the temperature change mutation position, the error is small, the measurement accuracy is high, and the liquid level measurement accuracy of the low-temperature liquefied gas is improved; meanwhile, the structure is simple, and the operation is convenient.
The detailed description is as follows: the liquid level of liquefied gas is in the interval between the detection end 210 of two adjacent temperature sensor 200, and when the liquid level of liquefied gas is in the different positions in this interval, the difference in temperature numerical value between two adjacent temperature sensor 200 also can be different, therefore, the staff can collect the numerical value at the test stage, be about to divide this interval into a plurality of points evenly, then make the liquid level of liquefied gas be in the position when each point respectively and test, obtain this interval each point position and its corresponding adjacent two difference in temperature numerical value distribution table between temperature sensor 200, and every difference in temperature of difference numerical value distribution table is vertical corresponds again the vertical height numerical value of every point of installation pole 100, and above-mentioned data are recorded in the display processor system in advance. Therefore, in one measurement, the temperature difference value of a group of two temperature sensors 200 is obtained firstly, then the value with the maximum temperature difference is obtained, and finally the liquid level height of the liquefied gas can be accurately obtained by contrasting the temperature difference value distribution table.
In the step S300, referring to fig. 1 and 2, the mounting rod 100 is placed in the cryogenic liquefied gas in a direction perpendicular to the liquid level of the cryogenic liquefied gas, and the lower end of the mounting rod 100 straightens the bottom of the cryogenic insulation gas cylinder, ensuring the accuracy of the measurement.
In step S400, referring to fig. 1 and 2, the standing time is 5S to 20S, so as to ensure that the liquid level of the cryogenic liquefied gas in the cryogenic insulation gas cylinder is in a stationary state and ensure that the temperature sensor 200 can measure the ambient temperature.
In the step S100, referring to fig. 1, 3 and 4, the mounting seat 220 of the temperature sensor 200 is provided with a mounting plate 240, the mounting plates 240 of the plurality of temperature sensors 200 are sequentially and spirally mounted on the outer wall of the mounting rod 100 from bottom to top, and a longitudinal distance and a radial distance exist between two adjacent temperature sensors 200. Therefore, the installation of two adjacent temperature sensors 200 in the longitudinal space of the installation rod 100 does not interfere, so that the longitudinal distance between the detection ends 210 of two adjacent temperature sensors 200 can be set within the range of 0mm to 10 mm.
In the step S100, the longitudinal distance is 0mm to 10mm, and a value of a distance between the detection ends 210 of two adjacent temperature sensors 200 is determined according to actually required measurement accuracy or according to different measured low-temperature liquefied gases during application. The smaller the longitudinal distance between the detection ends 210 of two adjacent temperature sensors 200 is, the less the influence of environmental factors is, the smaller the measurement error of the temperature sensor 200 is, and the higher the measurement accuracy is. An operator can set the longitudinal distance between the detection ends 210 of two adjacent temperature sensors 200 to a small value, so that when the temperature difference between one group of two adjacent temperature sensors 200 has a remarkable sudden change, the liquid level height of the liquefied gas can be obtained more accurately, and the smaller the measurement error is, the higher the measurement accuracy is.
Referring to fig. 1, 3 and 4, the temperature sensors 200 are electrically connected to the data interface 110 through signal transmission lines. The data interface 110 is electrically connected with the display processor through a transmission line to realize data transmission, so that the wiring of workers is convenient.
In the step S100, referring to fig. 1, 3 and 4, a plurality of adjusting assemblies 300 are further provided, and each adjusting assembly 300 is disposed corresponding to one of the temperature sensors 200. The adjustment assembly 300 includes a bolt 310 and a nut 320. The mounting rod 100 is a hollow rod, a plurality of strip-shaped grooves 120 longitudinally distributed penetrate through the outer wall of the mounting rod 100, and each strip-shaped groove 120 corresponds to one temperature sensor 200; the mounting plate 140 is provided with a mounting hole.
Referring to fig. 1, 3 and 4, the screw 311 of the bolt 310 is movably connected to the strip-shaped groove 120, so that the nut 312 of the bolt 300 is limited in the mounting rod 100 by the strip-shaped groove 120, the mounting hole of the mounting plate 240 is sleeved on the screw 311 of the bolt 310, the nut 320 is in threaded connection with the screw 311 of the bolt 310, and finally the nut 320 is screwed to fix the mounting plate 240 on the bolt 310. The specific operation steps are as follows: loosen nut 320, portable mounting panel 240 and bolt 310 follow strip groove 120 shifts up or moves down, adjusts adjacent two when longitudinal distance between temperature sensor 200's the sense terminal 210 is for setting for numerical value, screws up nut 320 makes temperature sensor 200's mount pad 220 and the outer wall butt of installation pole 100, and nut 312 of bolt 310 and the inner wall butt of installation pole 100 can be fixed temperature sensor 200, and it is convenient to adjust, connects stably simultaneously.
In the step S100, referring to fig. 1, 3 and 4, the outer wall of the installation rod 100 is provided with a notch 130 at the top or the bottom of the strip-shaped groove 120, the nut 312 of the bolt 310 firstly passes through the notch 130, and then the screw 311 of the bolt 310 is movably connected to the strip-shaped groove 120, so that the nut 312 of the bolt 310 conveniently passes through the notch 130, and the screw 311 of the bolt 310 is installed in the strip-shaped groove 120, and the installation is convenient.
In the step S100, referring to fig. 1, 3 and 4, a data interface 110 is also provided. Each of the temperature sensors 200 is provided with a signal transmission line (not shown); install data interface 110 in the top of installation pole 100 earlier, will again signal transmission line passes strip groove 112 follows the inside of installation pole 100 with data interface 110 electricity is connected, avoids signal transmission line set up in the outer wall of installation pole 100 appears the confusion phenomenon, and signal transmission line sets up inside installation pole 100 simultaneously, makes the compact structure of low temperature liquefied gas liquid level measurement method, succinct. In the step S300, the data interface 110 is electrically connected to the display processor through a cable, so as to facilitate connection.
In the step S100, the temperature sensor 200 is provided as a platinum resistance temperature sensor. The platinum resistance temperature sensor is mature in the prior art, the platinum resistance temperature sensor measures temperature by utilizing the characteristic that the resistance value of metal platinum changes along with the change of the temperature, and a display instrument can indicate the temperature value corresponding to the resistance value of the platinum resistance. Meanwhile, the platinum resistance temperature sensor is the most accurate and stable temperature sensor, and the linearity of the platinum resistance temperature sensor is superior to that of a thermocouple and a thermistor.
Referring to fig. 3 and 4, in the step S100, a mouthpiece seal 140 is further provided, and the mouthpiece seal 140 is mounted to an upper end of the mounting bar 100. In step S300, the upper end of the mounting rod 100 is held, the mounting rod 100 is mounted in the cryogenic liquefied gas perpendicular to the liquid level of the cryogenic liquefied gas, and the mouth seal 140 is sealed against the mouth of a cryogenic insulation gas cylinder (not shown) containing the cryogenic liquefied gas to prevent the cryogenic liquefied gas from diffusing out of the cryogenic liquefied gas. Bottleneck sealing member 140's material is silica gel or rubber, through bottleneck sealing member 140 plugs up the bottleneck of low-temperature liquid, realizes that the bottleneck is sealed, convenient operation.
The display processor (not shown) is a mature prior art, and therefore, the structure and the operation principle of the display processor are not described herein again.
The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the present invention pertains, the architecture form can be flexible and varied without departing from the concept of the present invention, and a series of products can be derived. But rather a number of simple derivations or substitutions are made which are to be considered as falling within the scope of the invention as defined by the appended claims.
Claims (9)
1. A cryogenic liquefied gas level measurement method is characterized by comprising the following steps:
s100: providing an installation rod and a plurality of temperature sensors, and sequentially installing the temperature sensors on the installation rod from bottom to top; a plurality of adjusting components are also provided, and each adjusting component corresponds to one temperature sensor; the adjusting assembly comprises a bolt and a nut; the mounting rod is a hollow rod, a plurality of strip-shaped grooves which are longitudinally distributed penetrate through the outer wall of the mounting rod, and each strip-shaped groove corresponds to one temperature sensor; the mounting seat of the temperature sensor is provided with a mounting plate, and a mounting hole penetrates through the mounting plate; the outer wall of the mounting rod is provided with a notch at the top or the bottom of the strip-shaped groove, a screw cap of the bolt penetrates through the notch, and a screw rod of the bolt is movably connected to the strip-shaped groove;
s200: providing a display processor for processing and displaying data transmitted by the plurality of temperature sensors;
s300: holding the upper end of the mounting rod, and mounting the mounting rod in the low-temperature liquefied gas in a manner that the mounting rod is vertical to the liquid level of the low-temperature liquefied gas;
s400: standing for a period of time to keep the installation rod and the liquid level of the low-temperature liquefied gas relatively stable;
s500: switching on a plurality of temperature sensors and the display processor, wherein each temperature sensor transmits the measured temperature value to the display processor to obtain the temperature difference value of two adjacent temperature sensors; the temperature difference of the low-temperature liquefied gas in the gas state and the liquid state and the temperature change rule of the temperature in the gas phase space and the liquid phase space respectively are utilized to find out the numerical value of the temperature difference and the numerical value of the temperature change mutation, and the liquid level height of the low-temperature liquefied gas is judged according to the height calibrated by the temperature sensor at the temperature change mutation position.
2. A cryogenic liquefied gas level measurement method according to claim 1, wherein: in the step S300, the mounting rod is placed in the cryogenic liquefied gas in a direction perpendicular to the liquid level of the cryogenic liquefied gas, and the lower end of the mounting rod extends the bottom of the cryogenic insulation gas cylinder.
3. A cryogenic liquefied gas level measurement method according to claim 1, wherein: in the step S300, the standing time is 5S-20S.
4. A cryogenic liquefied gas level measurement method according to any one of claims 1-3, characterized in that: in the step S100, the mounting plates of the plurality of temperature sensors are sequentially and spirally mounted on the outer wall of the mounting rod from bottom to top, and a longitudinal distance and a radial distance exist between the detection ends of two adjacent temperature sensors.
5. A cryogenic liquefied gas level measurement method according to claim 4, wherein: in the step S100, the screw rod of the bolt is movably connected to the strip-shaped groove, so that the nut of the bolt is limited in the installation rod by the strip-shaped groove, the installation hole is sleeved on the screw rod of the bolt, the nut is connected to the screw rod of the bolt in a threaded manner, and finally the nut is screwed down to fix the installation plate on the bolt.
6. A cryogenic liquefied gas level measurement method according to claim 4, wherein: in the step S100, the longitudinal pitch is 0mm to 10 mm.
7. A cryogenic liquefied gas level measurement method according to claim 5, wherein: in the step S100, a data interface is further provided; each temperature sensor is provided with a signal transmission line; firstly, a data interface is installed on the top of the installation rod, and then the signal transmission line penetrates through the strip-shaped groove and is electrically connected with the data interface along the inside of the installation rod; in the step S300, the data interface is electrically connected to the display processor through a cable.
8. A cryogenic liquefied gas level measurement method according to any one of claims 1-3, characterized in that: in the step S100, the temperature sensor provided is a platinum resistance temperature sensor.
9. A cryogenic liquefied gas level measurement method according to any one of claims 1-3, characterized in that: in step S100, a mouth seal is further provided, and the mouth seal is mounted on an upper end of the mounting rod.
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