CN204881769U - Low temperature liquid nitrogen liquid level detection device - Google Patents
Low temperature liquid nitrogen liquid level detection device Download PDFInfo
- Publication number
- CN204881769U CN204881769U CN201520282171.8U CN201520282171U CN204881769U CN 204881769 U CN204881769 U CN 204881769U CN 201520282171 U CN201520282171 U CN 201520282171U CN 204881769 U CN204881769 U CN 204881769U
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- capacitive transducer
- liquid level
- low temperature
- liquid nitrogen
- detection device
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Abstract
The utility model discloses a low temperature liquid nitrogen liquid level detection device, include: cylinder jar, capacitive sensor, shielded cable and electric capacity treatment circuit, capacitive sensor is cylindrically, and capacitive sensor is perpendicular to be set up in the cylinder jar, the electric capacity treatment circuit with shielded cable connects, shielded cable connects capacitive sensor's upper end, capacitive sensor's lower extreme is opened has the round hole. In this way, the utility model discloses the size of electric capacity in the condenser can be surveyed out, the information that reachs low temperature liquid nitrogen liquid level is calculated according to the size of electric capacity, low temperature liquid nitrogen liquid level detection device simple structure, convenient to use, it is with low costs, small, can detect cryogenic liquids's liquid level.
Description
Technical field
The utility model relates to liquid level detection device field, particularly relates to a kind of low temperature liquid nitrogen liquid level detection device.
Background technology
Tracer liquid liquid level is usually needed in commercial Application or experiment test, conventional liquid-level detecting method by the effect of float in main body by the perble range outside liquid nitrogen liquid level gauge main body turnover panel is stirred and shows red and white, and indicate different liquid levels with the mobile of float; On the left of indicator, be furnished with eye-catching graduated scale, the liquid level of liquid can be obtained according to the red and white contrast graduated scale of display.Also have a kind of method, at least two pressure transducers are set in the liquid that liquid measure cylinder holds, and calculate liquid pressure difference and gas pressure difference according to the value that sensor records; Again poor according to the liquid pressure that calculates, gas pressure intensity is poor and the height value of vertical range calculating liquid level between sensor.But these methods all accurately cannot measure the liquid level of low temperature liquid nitrogen (-196 ° of C), more difficult application in limited installing space.
Utility model content
The technical matters that the utility model mainly solves is to provide a kind of low temperature liquid nitrogen liquid level detection device, can detect the size of electric capacity in capacitor, calculates the information of low temperature liquid nitrogen liquid level according to the size of electric capacity; Low temperature liquid nitrogen liquid level detection device structure is simple, and easy to use, cost is low, and volume is little, can detect the liquid level of cryogenic liquid.
For solving the problems of the technologies described above, the technical scheme that the utility model adopts is: provide a kind of low temperature liquid nitrogen liquid level detection device, comprising: cylindrical tank, capacitive transducer, shielded cable and electric capacity treatment circuit; Described capacitive transducer is cylindrical, and capacitive transducer is vertically set in described cylindrical tank; Described electric capacity treatment circuit is connected with described shielded cable; Described shielded cable is connected to the upper end of described capacitive transducer, and the lower end of capacitive transducer has circular hole.
Preferably, described capacitive transducer comprises electrode and capacitive transducer external electrode in capacitive transducer; Described capacitive transducer dispatch from foreign news agency very stainless steel cylindrical hollow configuration; In described capacitive transducer, electrode is solid stainless steel bar.
Preferably, the height of described capacitive transducer is far longer than the diameter of capacitive transducer.
The beneficial effects of the utility model are: the utility model can detect the size of electric capacity in capacitor, calculate the information of low temperature liquid nitrogen liquid level according to the size of electric capacity.
Accompanying drawing explanation
Fig. 1 is the perspective view of a kind of low temperature liquid nitrogen liquid level detection device one of the utility model preferred embodiment;
In accompanying drawing, the mark of each parts is as follows: 1, electrode in capacitive transducer; 2, capacitive transducer external electrode; 3, circular hole; 4, wire; 5, cylindrical tank; 6, electric capacity treatment circuit.
Embodiment
Below in conjunction with accompanying drawing, preferred embodiment of the present utility model is described in detail, to make advantage of the present utility model and feature can be easier to be readily appreciated by one skilled in the art, thus more explicit defining is made to protection domain of the present utility model.
Refer to Fig. 1, the utility model embodiment comprises:
A kind of low temperature liquid nitrogen liquid level detection device, comprising: cylindrical tank 5, capacitive transducer, shielded cable 4 and electric capacity treatment circuit 6; Described capacitive transducer is cylindrical, and electric capacity can be avoided to be subject to ectocine.Described capacitive transducer is vertically set in described cylindrical tank 5, fills liquid nitrogen in cylindrical tank 5.Described electric capacity treatment circuit 6 is connected with described shielded cable 4, shielded cable 4 is connected to the upper end of described capacitive transducer, linearization process can be completed, the interface that the Detection Information for liquid level is provided convenience to the electric capacity occurred in testing process and the nonlinear problem of liquid level.The lower end of described capacitive transducer has circular hole 3, and circular hole 3 can make the liquid nitrogen liquid level of capacitive transducer inside and outside maintenance phase co-altitude, is convenient to calculate liquid nitrogen liquid level accurately.Described capacitive transducer comprises electrode 1 and capacitive transducer external electrode 2 in capacitive transducer; Described capacitive transducer external electrode 2 is stainless steel cylindrical hollow configuration, and stainless steel cylindrical hollow configuration solves the shielding problem of electromagnetic field, avoids measured electric capacity by ectocine, and low temperature resistant, is convenient to use in cryogenic liquid; In described capacitive transducer, electrode 1 is solid stainless steel bar, and solid stainless steel bar has good low temperature tolerance characteristics, can use in cryogenic liquid.The height of capacitive transducer is far longer than the diameter of capacitive transducer, can be convenient to install capacitive transducer in limited space.
A kind of low temperature liquid nitrogen liquid-level detecting method: capacitive transducer is vertically placed on and is equipped with in the cylindrical tank of liquid nitrogen, and liquid nitrogen is from the circular hole flows into capacitor sensor internal of capacitive transducer lower end, until the liquid nitrogen in flows into capacitor sensor is concordant with the liquid nitrogen in cylindrical tank; The nonlinear problem of electric capacity processing circuit processes electric capacity and liquid level; The height calculating the inner liquid nitrogen of capacitive transducer just can obtain the liquid level of liquid nitrogen in cylindrical tank; The liquid level of liquid nitrogen in cylindrical tank can be calculated by following formula:
In formula, R is the diameter of the external electrode of capacitive transducer; R is the diameter of the interior electrode of capacitive transducer;
for permittivity of vacuum;
for fluid to be measured specific inductive capacity; L is the height of capacitive transducer; H is the height of the inner liquid nitrogen of capacitive transducer.
The utility model can detect the size of electric capacity in capacitor, calculates the information of low temperature liquid nitrogen liquid level according to the size of electric capacity; Low temperature liquid nitrogen liquid level detection device structure is simple, and easy to use, cost is low, and volume is little, can detect the liquid level of cryogenic liquid.
The foregoing is only embodiment of the present utility model; not thereby the scope of the claims of the present utility model is limited; every utilize the utility model instructions and accompanying drawing content to do equivalent structure or equivalent flow process conversion; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present utility model.
Claims (3)
1. a low temperature liquid nitrogen liquid level detection device, is characterized in that, comprising: cylindrical tank, capacitive transducer, shielded cable and electric capacity treatment circuit; Described capacitive transducer is cylindrical, and capacitive transducer is vertically set in described cylindrical tank; Described electric capacity treatment circuit is connected with described shielded cable; Described shielded cable is connected to the upper end of described capacitive transducer, and the lower end of capacitive transducer has circular hole.
2. a kind of low temperature liquid nitrogen liquid level detection device according to claim 1, is characterized in that: described capacitive transducer comprises electrode and capacitive transducer external electrode in capacitive transducer; Described capacitive transducer dispatch from foreign news agency very stainless steel cylindrical hollow configuration; In described capacitive transducer, electrode is solid stainless steel bar.
3. a kind of low temperature liquid nitrogen liquid level detection device according to claim 1, is characterized in that: the height of described capacitive transducer is much larger than the diameter of capacitive transducer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520282171.8U CN204881769U (en) | 2015-05-05 | 2015-05-05 | Low temperature liquid nitrogen liquid level detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520282171.8U CN204881769U (en) | 2015-05-05 | 2015-05-05 | Low temperature liquid nitrogen liquid level detection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204881769U true CN204881769U (en) | 2015-12-16 |
Family
ID=54826131
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520282171.8U Expired - Fee Related CN204881769U (en) | 2015-05-05 | 2015-05-05 | Low temperature liquid nitrogen liquid level detection device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204881769U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105043501A (en) * | 2015-05-05 | 2015-11-11 | 苏州市职业大学 | Liquid level detecting device for low-temperature liquid nitrogen and detecting method thereof |
-
2015
- 2015-05-05 CN CN201520282171.8U patent/CN204881769U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105043501A (en) * | 2015-05-05 | 2015-11-11 | 苏州市职业大学 | Liquid level detecting device for low-temperature liquid nitrogen and detecting method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20151216 Termination date: 20160505 |