CN212842374U - Cryostat with liquid level is reported to police and prediction function - Google Patents
Cryostat with liquid level is reported to police and prediction function Download PDFInfo
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- CN212842374U CN212842374U CN202020825835.1U CN202020825835U CN212842374U CN 212842374 U CN212842374 U CN 212842374U CN 202020825835 U CN202020825835 U CN 202020825835U CN 212842374 U CN212842374 U CN 212842374U
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Abstract
The utility model discloses a cryostat with liquid level warning and prediction function, including cryostat, liquid nitrogen liquid level sensing mechanism, signal acquisition processing equipment and warning and prediction equipment, cryostat's liquid nitrogen chamber wall top-down is equidistant to be provided with a plurality of horizontal trompils, is provided with the blind pipe in the horizontal trompil, be provided with the mounting hole on cryostat's vacuum cavity outer wall, liquid nitrogen liquid level sensing mechanism passes through the mounting hole to be installed in the vacuum cavity, liquid nitrogen liquid level sensing mechanism still with signal acquisition equipment is connected, signal acquisition equipment connect in warning and prediction equipment; the liquid nitrogen liquid level sensing mechanism comprises a top thermocouple, a bottom thermocouple and a plurality of middle thermocouples which are respectively arranged in a blind pipe on the wall surface of the liquid nitrogen chamber. The utility model discloses but the liquid level in the real time monitoring liquid nitrogen chamber does not influence cryostat's vacuum simultaneously, and possesses higher use reliability.
Description
Technical Field
The utility model relates to a cryostat technical field especially relates to a cryostat with liquid level is reported to police and prediction function.
Background
The cryostat is an accurate temperature control device and is widely applied to various scientific research scenes, such as thermoelectric material testing, optical testing, mechanical testing and the like. The main function of the device is to provide a stable environment with variable temperature, such as a liquid nitrogen cryostat (as shown in figure 1), which can control the temperature of the sample stage at any value of 77K-600K after being matched with an accurate temperature control device.
Taking a liquid nitrogen cryostat as an example, the main components of the cryostat are a sample stage, a vacuum cavity and a liquid nitrogen chamber. The liquid feeding rod is inserted into the liquid nitrogen chamber, liquid nitrogen is poured into the liquid feeding rod through the funnel, an opening is formed in the liquid feeding rod, and the liquid nitrogen flows into the liquid nitrogen chamber from the opening. Since liquid nitrogen is a very low temperature liquid and cannot be tolerated by general materials, the liquid nitrogen chamber is made of non-transparent stainless steel. The vacuum cavity has the functions of providing a vacuum environment for a sample experiment, weakening a heat transfer process and reducing heat transferred from the environment to the liquid nitrogen chamber. In order to ensure the vacuum degree of the vacuum chamber, the shell at the periphery of the vacuum chamber is also made of stainless steel alloy generally. However, this situation causes a problem that the user cannot know the specific liquid level of the liquid nitrogen chamber, which causes inconvenience to the experiment. For example, when the liquid nitrogen is consumed soon, the liquid nitrogen is not filled timely, which may cause the temperature fluctuation of the sample stage; it may also lead to failure of the experiment for several hours. For example, when the liquid nitrogen is filled up quickly, the liquid nitrogen is continuously filled, which can cause the liquid nitrogen to be sprayed out from the exhaust port and the filling port, and the danger exists. Therefore, a liquid level alarm function needs to be added to the cryostat, and a user needs to know the approximate real-time liquid level in the liquid nitrogen chamber to arrange the next work conveniently. To the problem that this type of cryostat exists, combine the demand of cryostat in the aspect of liquid nitrogen liquid level, this patent provides a cryostat with prediction of liquid nitrogen liquid level and alarming function.
At present, a common mode for measuring the liquid level of the liquid nitrogen is continuous measurement, such as ultrasonic measurement and differential pressure transducer measurement. For liquid nitrogen cryostats used in laboratories, neither method is applicable. As in the patent "ultrasonic liquid level measurement display device for liquid nitrogen tank" (patent No. 200820173045.9), a method of testing a liquid level using ultrasonic waves is described. The device comprises a transmitting probe, a liquid level display control system, a liquid crystal display, an ultrasonic probe and a liquid nitrogen tank. The length, width and height of a general experimental cryostat are about 80mm x 380mm, the liquid nitrogen chamber is phi 60mm x 170mm, the space of the liquid nitrogen chamber is narrow, a large amount of steam and wall reflection generated during working can interfere with an ultrasonic signal, and measurement failure can be caused.
In the patent "a high precision liquid nitrogen level measurement system" (patent application No. 201520955228.6), a method of measuring the liquid nitrogen level using a differential pressure transducer is described. In the method, a hole needs to be formed in a liquid nitrogen chamber and a plurality of low-temperature pipelines need to be led out, and a vacuum cavity in a low-temperature thermostat of a laboratory is very narrow and difficult to arrange; meanwhile, the cryogenic pipeline contains liquid nitrogen/nitrogen gas and simultaneously passes through the vacuum cavity, so that the vacuum degree can be influenced, and the reliability of the product is reduced.
Another common measurement mode of liquid nitrogen liquid level is position measurement, which utilizes the difference between the temperatures above and below the liquid level of liquid nitrogen to judge the position of liquid nitrogen. In the patent "a built-in liquid nitrogen level monitoring device" (patent No. 201821421540.7), a device for determining the liquid nitrogen level based on the principle of level measurement is described. This patent uses stainless steel tubes to be threaded through the foam plugs to remain vertical, and platinum resistor arrays are arranged vertically by extending down through the stainless steel tubes. However, the device related to the patent adopts a structure of combining foam and a steel pipe, and is not suitable for welding occasions; nor to structures requiring vacuum. And therefore not applicable to the cryostat to which this patent relates.
Based on the above problem, combine the demand of cryostat in the aspect of the liquid nitrogen liquid level, this patent provides a cryostat with prediction of liquid nitrogen liquid level and alarming function. The cryostat is based on the basic principle of position measurement, a transverse blind pipe is arranged in an inner cavity, and a temperature measuring device is placed in the blind pipe. The liquid level of the liquid nitrogen can be effectively monitored, the vacuum degree of the cryostat is not influenced, and the use reliability is higher.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model lies in providing a liquid level warning and prediction function's cryostat to the defect among the prior art.
The utility model provides a technical scheme that its technical problem adopted is:
the cryostat with liquid level alarming and predicting functions comprises a cryostat body, a liquid nitrogen liquid level sensing mechanism, signal acquisition and processing equipment and alarming and predicting equipment, wherein a plurality of transverse openings are formed in the wall surface of a liquid nitrogen chamber of the cryostat body at equal intervals from top to bottom;
the liquid nitrogen liquid level sensing mechanism comprises a top thermocouple, a bottom thermocouple and a plurality of middle thermocouples which are respectively arranged in a blind pipe on the wall surface of the liquid nitrogen chamber.
According to the technical scheme, the low-temperature constant-temperature mechanism further comprises a liquid nitrogen chamber, an exhaust port is formed in the top of the liquid nitrogen chamber, a sample table is arranged at the bottom of the liquid nitrogen chamber, a liquid feeding rod is arranged at the center of the liquid nitrogen chamber, and a vacuum cavity is formed outside the liquid nitrogen chamber.
According to the technical scheme, the blind pipe extends into the liquid nitrogen chamber and is welded and sealed with the wall surface of the liquid nitrogen chamber.
According to the technical scheme, the low-temperature constant-temperature mechanism is made of non-transparent stainless steel.
According to the technical scheme, the distance between the top thermocouple of the liquid nitrogen liquid level sensing mechanism and the top of the liquid nitrogen chamber is 8-10 mm, and the distance between the bottom thermocouple and the bottom of the liquid nitrogen chamber is 8-10 mm.
According to the technical scheme, the signal acquisition equipment is used for converting the signal of the liquid nitrogen liquid level sensing mechanism into liquid nitrogen liquid level information.
According to the technical scheme, the alarm and prediction equipment is used for liquid nitrogen liquid level display, alarm and prediction.
The utility model discloses the beneficial effect who produces is: the utility model provides a pair of cryostat of liquid level warning and prediction function, the mounting hole through offering on cryostat's vacuum cavity is with liquid nitrogen liquid level sensing mechanism installation vacuum cavity, cryostat's liquid nitrogen wall surface top-down is equidistant to be provided with a plurality of horizontal trompils, be provided with the blind pipe in the horizontal trompil, set up in the blind pipe a plurality of thermocouples of liquid nitrogen liquid level sensing mechanism, liquid nitrogen liquid level sensing mechanism still is connected with signal acquisition equipment, and signal acquisition equipment connects in warning and prediction equipment. The utility model discloses but the liquid level in the real time monitoring liquid nitrogen chamber does not influence cryostat's vacuum simultaneously, and possesses higher use reliability.
Drawings
The invention will be further explained with reference to the drawings and examples, wherein:
fig. 1 is a schematic structural diagram of an embodiment of the present invention;
FIG. 2 is a partial cross-sectional view of the wall surface of the blind tube and liquid nitrogen chamber in region A;
fig. 3 is a graph of actual measurement data of the thermocouple in the liquid nitrogen chamber according to the embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.
The basic principle of the utility model is as follows:
the liquid nitrogen temperature is generally about-196 ℃ under normal pressure. When liquid nitrogen is in a conventional stable container, the temperature below the liquid level of the liquid nitrogen is about-196 ℃; above the liquid level of the liquid nitrogen, a gradually rising temperature gradient is generated in the vertical direction. For a stably operating cryostat, the temperature gradient can be predicted by heat exchange calculation, i.e. at any time, if the position of the liquid level is known, the temperature gradient above the liquid level (i.e. the temperature values at each position in the vertical direction) can be calculated by heat exchange. Adopt reverse thinking method in this patent, through the real-time temperature that records a certain position above the liquid level, combine the heat transfer to calculate to can reverse the approximate real-time position of calculating liquid nitrogen liquid level, and show in real time in the display, provide the concrete quantized value of liquid level for the user.
As shown in fig. 1, the utility model provides a cryostat with liquid level warning and prediction function, including cryostat structure 1, liquid nitrogen liquid level sensing mechanism 2, signal acquisition processing apparatus 3 and warning and prediction equipment 4, 11 wall top-down equidistant a plurality of horizontal trompils in cryostat structure's 1 liquid nitrogen room, be provided with the blind pipe in the horizontal trompil, be provided with mounting hole 16 on cryostat structure's 1 vacuum cavity 12 outer wall, liquid nitrogen liquid level sensing mechanism 2 passes through mounting hole 16 to be installed in vacuum cavity 12, and liquid nitrogen liquid level sensing mechanism 2 still is connected with signal acquisition equipment 3, and signal acquisition equipment 3 is connected in warning and prediction equipment 4.
The liquid nitrogen liquid level sensing mechanism 2 comprises a top thermocouple 21, a bottom thermocouple 23 and a plurality of middle thermocouples 22 which are respectively arranged in blind pipes on the wall surface of the liquid nitrogen chamber 11. This patent can effectively monitor the liquid nitrogen liquid level, does not influence cryostat's vacuum simultaneously, and possesses higher use reliability.
Further, the cryostat 1 further comprises a liquid nitrogen chamber 11, an exhaust port 13 is arranged at the top of the liquid nitrogen chamber 11, a sample stage 15 is arranged at the bottom of the liquid nitrogen chamber 11, a liquid adding rod 14 is arranged at the center of the liquid nitrogen chamber 11, and a vacuum cavity 12 is arranged outside the liquid nitrogen chamber 11.
Further, the blind pipe extends into the liquid nitrogen chamber 11 and is welded and sealed with the wall surface of the liquid nitrogen chamber 11. As shown in fig. 2, wherein B is a vertical wall surface of the liquid nitrogen chamber 11, and is provided with a horizontal opening; c is a blind pipe, penetrates through the transverse horizontal opening, extends into the liquid nitrogen chamber 11, and is welded and sealed with the wall surface of the liquid nitrogen chamber 11; the inner diameter of the blind pipe is the same as the diameter of the thermocouple; the thermocouple probe is inserted into the blind pipe and extends into the liquid nitrogen chamber together with the blind pipe to measure the temperature.
Further, the material of the low-temperature constant-temperature mechanism 1 is non-transparent stainless steel.
Further, a top thermocouple 21 of the liquid nitrogen liquid level sensing mechanism 2 is 8-10 mm away from the top of the liquid nitrogen chamber 11, and a bottom thermocouple 23 is 8-10 mm away from the bottom of the liquid nitrogen chamber 11.
Further, the signal acquisition device 3 is used for converting the signal of the liquid nitrogen liquid level sensing mechanism 2 into liquid nitrogen liquid level information.
Further, the alarm and prediction device 4 is used for liquid nitrogen level display, alarm and prediction.
In practical application, as the liquid nitrogen is continuously consumed and the nitrogen is discharged, the temperature changes at different positions in the liquid nitrogen chamber 11 are shown in fig. 3, wherein the liquid level relationship in the liquid nitrogen chamber is as follows:
liquid level A of liquid nitrogen: high liquid level alarm;
liquid nitrogen level B: the liquid level is between the top thermocouple 21 and the middle thermocouple 22;
liquid level C of liquid nitrogen: the liquid level is between the middle thermocouple 22 and the bottom thermocouple 23;
liquid nitrogen level D: and (5) alarming at low liquid level.
It will be understood that modifications and variations can be made by persons skilled in the art in light of the above teachings and all such modifications and variations are considered to be within the scope of the invention as defined by the following claims.
Claims (7)
1. A cryostat with liquid level alarming and predicting functions is characterized by comprising a cryostat mechanism, a liquid nitrogen liquid level sensing mechanism, a signal acquisition processing device and an alarming and predicting device, wherein a plurality of transverse openings are formed in the wall surface of a liquid nitrogen chamber of the cryostat mechanism at equal intervals from top to bottom, blind pipes are arranged in the transverse openings, mounting holes are formed in the outer wall of a vacuum chamber of the cryostat mechanism, the liquid nitrogen liquid level sensing mechanism is mounted in the vacuum chamber through the mounting holes, the liquid nitrogen liquid level sensing mechanism is further connected with the signal acquisition device, and the signal acquisition device is connected with the alarming and predicting device;
the liquid nitrogen liquid level sensing mechanism comprises a top thermocouple, a bottom thermocouple and a plurality of middle thermocouples which are respectively arranged in a blind pipe on the wall surface of the liquid nitrogen chamber.
2. The cryostat with liquid level alarm and prediction function as claimed in claim 1, wherein the cryostat further comprises a liquid nitrogen chamber, the top of the liquid nitrogen chamber is provided with an exhaust port, the bottom is provided with a sample stage, the center part is provided with a liquid feeding rod, and the outside of the liquid nitrogen chamber is a vacuum chamber.
3. The cryostat having the function of alarming and predicting the liquid level according to claim 1, wherein the blind pipe extends into the liquid nitrogen chamber and is welded and sealed with the wall surface of the liquid nitrogen chamber.
4. The cryostat having the function of liquid level alarm and prediction according to claim 1, wherein the material of said cryostat body is non-transparent stainless steel.
5. The cryostat with liquid level alarm and prediction function as claimed in claim 1, wherein the top thermocouple of the liquid nitrogen level sensing mechanism is 8-10 mm away from the top of the liquid nitrogen chamber, and the bottom thermocouple is 8-10 mm away from the bottom of the liquid nitrogen chamber.
6. The cryostat with liquid level alarming and predicting functions as recited in claim 1, wherein said signal collecting device is used for converting the signal of said liquid nitrogen level sensing mechanism into liquid nitrogen level information.
7. The cryostat with liquid level alarming and predicting function according to claim 1, wherein said alarming and predicting device is used for liquid nitrogen level display, alarming and predicting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020825835.1U CN212842374U (en) | 2020-05-18 | 2020-05-18 | Cryostat with liquid level is reported to police and prediction function |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020825835.1U CN212842374U (en) | 2020-05-18 | 2020-05-18 | Cryostat with liquid level is reported to police and prediction function |
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| CN212842374U true CN212842374U (en) | 2021-03-30 |
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| CN202020825835.1U Active CN212842374U (en) | 2020-05-18 | 2020-05-18 | Cryostat with liquid level is reported to police and prediction function |
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