CN101813505A - Liquid helium level gauge and use method thereof - Google Patents
Liquid helium level gauge and use method thereof Download PDFInfo
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- CN101813505A CN101813505A CN 201010173158 CN201010173158A CN101813505A CN 101813505 A CN101813505 A CN 101813505A CN 201010173158 CN201010173158 CN 201010173158 CN 201010173158 A CN201010173158 A CN 201010173158A CN 101813505 A CN101813505 A CN 101813505A
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Abstract
The invention relates to a liquid helium level gauge, comprising a holding member, a slender member and a special temperature sensing color-varying coating; the holding member is installed at the first end of the slender member; the special temperature sensing color-varying coating is coated on the side surface of the slender member along the length direction of the slender member; the color of the special temperature sensing color-varying coating when at normal temperature is different from that in liquid helium; preferably, the special temperature sensing color-varying coating is stratified silicate coating; the cross section of the slender member is arc-shaped, L-shaped, H-shaped, round, elliptic, semicircular, rectangular, and the like; the special temperature sensing color-varying coating is coated on at least one side surface of the slender member; the side surface of the slender member is provided with a scale label extended from the second end of the slender member to the first end axially. The invention further provides a method for measuring liquid helium level using the liquid helium level gauge. The liquid helium level gauge has smart design, simple structure and convenient use, and is capable of quickly and accurately measuring the liquid helium level; and the liquid helium level gauge is applied to large-scale popularization and application.
Description
Technical field
The present invention relates to the measurement mechanism technical field, particularly the liquid level emasuring device technical field specifically is a kind of liquid helium level gauge and using method thereof.
Background technology
As common practise, liquid helium is a kind of liquid gas of extreme cold on the earth.It is the colorless and odorless liquid gas of a kind of 4.2k (-269 ℃ approximately), seems just as common pure water.
Because the huge temperature gradient of its temperature and room temperature, liquid helium must be stored in invisible (promptly can not a have an X-rayed) liquid helium vessel, liquid helium vessel has at least one floor height vacuum (10
-6More than) barrier layer is with the restriction heat interchange, in some cases, also needs one deck liquid nitrogen barrier layer, therefore two-layer high vacuum separation layer places container.Because liquid helium evaporates very easily, even in liquid helium vessel, under extremely limited heat interchange situation, the liquid helium rate of evaporation can reach 1% liquid helium general assembly (TW) in one day sometimes.Therefore, often check the liquid level of liquid helium, this is very important, and is in time ready-to-fill in container according to liquid level.Liquid helium vessel heating else if needs a large amount of liquid heliums so that container is cooled to 4.2K, to store liquid helium once more so.
See also shown in Figure 1ly, in the general measure container in the liquid helium liquid level, the alloy long tube 11 of very long very thin-walled that is to use 2～3 millimeters of diameter of phi is as main body.An about long tube of 1.6 meters 11 can be used in measurement 50-150 and rises liquid helium vessel.Being about of 15～20 millimeters of diameter of phi that must weld other at an end of long tube 11 is 15 millimeters short tube 12, and these short tube 12 ends should cover with rubber diaphragm 13.In order to finish the measurement of liquid helium in the container, the thin end of long tube 11 moves up from the bottom of container, and a finger (usually using forefinger) should touch the rubber diaphragm surface gently, when the end of long tube 11 reaches liquid level, refers to and will experience vibration peak.Calculate long tube 11 slowly moves to vibration peak from the bottom length, it is exactly the liquid level of liquid helium in the container.But, there are many people to dislike this measuring method, because a people's finger is difficult to experience vibration peak sometimes, in other words, measuring is not very easy realization.
Therefore, need urgently provide a kind of liquid helium liquid level emasuring device, it can realize the measurement of liquid helium liquid level rapidly and accurately, and easy to use.
Summary of the invention
The objective of the invention is to have overcome above-mentioned shortcoming of the prior art, a kind of liquid helium level gauge and using method thereof are provided, this liquid helium level gauge design is ingenious, simple in structure, easy to use, can realize the measurement of liquid helium liquid level rapidly and accurately, is suitable for large-scale promotion application.
To achieve these goals, in a first aspect of the present invention, a kind of liquid helium level gauge is provided, be characterized in, comprise gripping member, elongate articles and extraordinary responsive to temperature discoloration coating, described elongate articles comprises first end and the second end, described gripping member is installed in described first end, described extraordinary responsive to temperature discoloration coating is coated on the side of described elongate articles along the length direction of described elongate articles, and described extraordinary responsive to temperature discoloration coating color at normal temperatures is variant with the color in liquid helium.
Preferably, described responsive to temperature discoloration coating is the phyllosilicate coating.
More preferably, the granularity of layered silicate coating is 60～120 orders.
Preferably, the responsive to temperature color change interval of described responsive to temperature discoloration coating can reach liquid helium four .2K (269 degree) considerably beyond existing scope (40 degree) on the market.
Preferably, the xsect of described elongate articles is circular arc, L shaped, I-shaped, circular, oval, semicircle, rectangle or triangle, and described extraordinary responsive to temperature discoloration coating is coated at least one side of described elongate articles.
Preferably, described elongate articles hollow.
More preferably, described side is the medial surface of described elongate articles.
Preferably, described elongate articles adopts the material of heat-transfer capability difference to make.
More preferably, the material of described heat-transfer capability difference is quartz, alloy or timber.
Preferably, described gripping member is a handle, and described handle extends along the axis direction of described elongate articles.
Preferably, the side of described elongate articles is provided with from described the second end initial to the axially extended yardstick coding of described first end.
More preferably, described yardstick coding and described extraordinary responsive to temperature discoloration coating do not overlap each other.
Preferably, described elongate articles is elongate rod or alloy elongated tubular.
Preferably, described elongate articles is provided with groove along its length in the side, and described extraordinary responsive to temperature discoloration coating is positioned at described groove and is coated on the bottom surface of described groove.
Preferably, described elongate articles comprises that elongated cotton cord bar, low temperature contain epoxy layer and compo pipe, described compo pipe is provided with opening along its length, described low temperature contains on the side that epoxy layer is coated on described elongated cotton cord bar, described compo pipe is coated on described low temperature and contains on the side of epoxy layer, and described extraordinary responsive to temperature discoloration coating is positioned at described opening and is coated in exposed described low temperature and contains on the side of epoxy layer.
In a second aspect of the present invention, a kind of method of using above-mentioned liquid helium level gauge to measure the liquid helium liquid level also is provided, be characterized in, may further comprise the steps:
(1) holds described gripping member, described elongate articles vertically is inserted into the bottom of the container that holds described liquid helium from the liquid level of liquid helium;
(2) hold described gripping member, and keep described elongate articles not rock, become calmness from fluidized state until described liquid helium;
(3) hold described gripping member, described elongate articles is vertically extracted in described container;
(4) length of variable color part on described elongate rod length direction of the described extraordinary responsive to temperature discoloration coating of measurement, it is the level value of described liquid helium.
Preferably, the side of described elongate articles is provided with from described the second end initial to the axially extended yardstick coding of described first end, measures described length by described yardstick coding in the described step (4).
Preferably, in described step (2), keep described elongate articles not rock, and the time that continues is less than 5 seconds.
Beneficial effect of the present invention is specific as follows:
1, the present invention applies described extraordinary responsive to temperature discoloration coating by the length direction at the described elongate articles in the upper edge, side of described elongate articles, utilize the difference of described extraordinary responsive to temperature discoloration coating color at normal temperatures and the color in liquid helium then, measure the liquid level of liquid helium, design ingenious, simple in structure, easy to use, can realize the measurement of liquid helium liquid level rapidly and accurately, be suitable for large-scale promotion application.
2, the side of described elongate articles of the present invention is provided with from described the second end initial to the axially extended yardstick coding of described first end, thereby make the measurement of length of variable color part on described elongate rod length direction of described extraordinary responsive to temperature discoloration coating become simple and reliable, design ingenious, simple in structure, easy to use, can realize the measurement of liquid helium liquid level rapidly and accurately, be suitable for large-scale promotion application.
Description of drawings
Fig. 1 is that the master of the level gauging utensil of the liquid helium that uses in the prior art looks synoptic diagram.
Fig. 2 is that the master of a specific embodiment of the present invention looks synoptic diagram.
Fig. 3 is the cross sectional representation of the elongate articles of specific embodiment shown in Figure 2.
Fig. 4 a～4d is respectively the cross sectional representation of four specific embodiments of elongate articles of the present invention.
Fig. 5 is that specific embodiment shown in Figure 2 master when using looks (perspective) synoptic diagram.
Embodiment
In order more to be expressly understood technology contents of the present invention, describe in detail especially exemplified by following examples.Wherein identical parts adopt identical Reference numeral.
See also shown in Fig. 2～3, liquid helium level gauge 10 of the present invention comprises gripping member 1, elongate articles 2 and extraordinary responsive to temperature discoloration coating 3, described elongate articles 2 comprises first end (not marking) and the second end (not marking), described gripping member 1 is installed in described first end, described extraordinary responsive to temperature discoloration coating 3 is coated on the side of described elongate articles 2 along the length direction of described elongate articles 2, and described extraordinary responsive to temperature discoloration coating 3 color at normal temperatures is variant with the color in liquid helium.
Preferably, described elongate articles 2 is elongate rod or elongated tubular.In specific embodiments of the invention, described elongate articles 2 is elongated tubulars.
The described extraordinary responsive to temperature discoloration coating 3 essential extraordinary responsive to temperature discoloration coatings of suitable 4.2K (269 degree) that adopt for example can adopt U.S. Pat 6,712, the extraordinary responsive to temperature discoloration coating that discloses among the 996B2.Preferably, described extraordinary responsive to temperature discoloration coating 3 is phyllosilicate coatings.More preferably, the granularity of layered silicate coating is 60～120 orders.In specific embodiments of the invention, the responsive to temperature color change interval of described extraordinary responsive to temperature discoloration coating 3 can reach liquid helium four .2K (269 degree) considerably beyond existing scope (40 degree) on the market.It at room temperature is a grey, and at-270 ℃, color fades to viridian look from grey.
The xsect of described elongate articles 2 can be any.Preferably, the xsect of described elongate articles 2 is circular arc, L shaped, I-shaped, circular, oval, semicircle, rectangle or triangle, and described extraordinary responsive to temperature discoloration coating 3 is coated at least one side of described elongate articles 2.That is to say, described extraordinary responsive to temperature discoloration coating 3 needs only along the length direction of described elongate articles 2 and applies, can apply whole sides of described elongate articles 2, also can only apply a certain or certain several side, for circular and oval, can apply the local side of described elongate articles 2.See also shown in Fig. 4 a, in a specific embodiment of the present invention, the xsect of described elongate articles 2 is a circular arc, and described extraordinary responsive to temperature discoloration coating 3 is coated on the side of described elongate articles 2; See also shown in Fig. 4 b, in another specific embodiment of the present invention, the xsect of described elongate articles 2 is L shaped, and described extraordinary responsive to temperature discoloration coating 3 is coated on the side of described elongate articles 2; See also shown in Fig. 4 c, in another specific embodiment of the present invention, the xsect of described elongate articles 2 is I-shaped, and described extraordinary responsive to temperature discoloration coating 3 is coated on two sides, centre of described elongate articles 2.
Preferably, described elongate articles 2 hollows.More preferably, described side is the medial surface of described elongate articles 2.See also shown in Figure 3ly, in specific embodiments of the invention, the xsect of described elongate articles 2 is a rectangular ring, and described extraordinary responsive to temperature discoloration coating 3 is coated in the medial surface of described elongate articles 2.The hole (joint) of container 20 when the benefit that described extraordinary responsive to temperature discoloration coating 3 is coated in the medial surface of described elongate articles 2 is to avoid using thus metal directly the described extraordinary responsive to temperature discoloration coating 3 of contact damage described extraordinary responsive to temperature discoloration coating 3.
Preferably, another kind is avoided being designed to of metal of the hole (joint) of described extraordinary responsive to temperature discoloration coating 3 direct contacting containers 20: described elongate articles 2 is provided with groove along its length in the side, described extraordinary responsive to temperature discoloration coating 3 is positioned at described groove and is coated on the bottom surface of described groove.See also shown in Fig. 4 d, in another specific embodiment of the present invention, described elongate articles 2 comprises that elongated cotton cord bar 14, low temperature contain epoxy layer 15 and compo pipe 16, described compo pipe 16 is provided with opening 17 along its length, described low temperature contains on the side that epoxy layer 15 is coated on described elongated cotton cord bar 14, described compo pipe 16 is coated on described low temperature and contains on the side of epoxy layer 15, and described extraordinary responsive to temperature discoloration coating 3 is positioned at described opening 17 and is coated in exposed described low temperature and contains on the side of epoxy layer 15.The angle that the line at the center of the both sides of opening 17 and elongated cotton cord bar 14 forms can be at 60 °～90 °.Above-mentioned elongate rod 1 is half flexibility, and 1.6 meters long can be used for 150 liters of liquid helium vessels, and 1.8 meters long can be used for 250 liters of liquid helium vessels.
After making that described elongate articles 2 immerses liquid helium, the surface of liquid helium is replied tranquil as soon as possible from fluidized state, and preferably, described elongate articles 2 adopts the material of heat-transfer capability difference to make.In specific embodiments of the invention, the material of described heat-transfer capability difference is quartz, alloy or timber.
Described gripping member 1 can be any suitable shape, grips as long as can be used for.In specific embodiments of the invention, described gripping member 1 is a handle, and described handle extends along the axis direction of described elongate articles 2.
Preferably, the side of described elongate articles 2 is provided with from described the second end initial to the axially extended yardstick coding of described first end (not shown).In specific embodiments of the invention, described yardstick coding and described extraordinary responsive to temperature discoloration coating 3 do not overlap each other.Thereby can more be clear that the length of variable color part on described elongate rod 2 length directions of described extraordinary responsive to temperature discoloration coating 3.
See also shown in Figure 5, be contained with liquid helium in the container 20, wherein Reference numeral 4 is represented the liquid level of liquid heliums, the variable color part that the described extraordinary responsive to temperature discoloration coating 3 of liquid helium is immersed in Reference numeral 5 expressions, the pedestal of Reference numeral 21 expression containers 20, the main body of Reference numeral 22 expression containers 20, the annular high vacuum barrier layer of Reference numeral 23 expression containers 20, the relief valve of Reference numeral 24 expression containers 20, the liquid of Reference numeral 25 expression containers 20 enters valve, the relief valve that is used for fluid passage of Reference numeral 26 expression containers 20, the gas gauge of Reference numeral 27 expression containers 20, use the method for the liquid level 4 of the liquid helium in above-mentioned liquid helium level gauge 10 measuring vessels 20, may further comprise the steps:
(1) holds described gripping member 1, described elongate articles 2 vertically is inserted into the bottom of the container 20 that holds described liquid helium from the liquid level of liquid helium;
(2) hold described gripping member 1, and keep described elongate articles 2 not rock and the lasting several seconds (approximately less than 5 seconds), wait for that described liquid helium becomes calmness from fluidized state;
(3) hold described gripping member 1, described elongate articles 2 is vertically extracted in described container 20;
(4) measure the length of variable color part 5 (becoming viridian look) on described elongate rod 2 length directions of described extraordinary responsive to temperature discoloration coating 3 by described yardstick coding, it is the level value of described liquid helium.
Liquid helium level gauge 10 of the present invention is reusable, only need (room temperature) wait for about 100 seconds in air, and described extraordinary responsive to temperature discoloration coating 3 becomes normal grey again and gets final product.Can immerse this moment and carry out the measurement of another time liquid level in the container 20 that holds liquid helium.According to the liquid level of liquid helium in the direct visible change color measuring vessel 20 of described extraordinary responsive to temperature discoloration coating 3, this is the best way.
Obviously, liquid helium level gauge 10 of the present invention is not only applicable to measure liquid helium, also is applicable to measure other cryogenic liquid, as long as described extraordinary responsive to temperature discoloration coating 3 color at normal temperatures is variant with the color in this cryogenic liquid.
In order to make liquid helium level gauge 10 of the present invention have longer serviceable life, the something that must conscientiously note is, when the elongate articles 2 with liquid helium level gauge 10 immerses and pulls out container 20, must avoid the metal of the hole (joint) of container 20 directly to contact described extraordinary responsive to temperature discoloration coating 3.Because the internal diameter of the hole of container 20 (joint) normally is 12～20 millimeters of diameter of phi, and the elongate rod 2 of liquid helium level gauge of the present invention 10 can reach 2 meters to be used for 100～250 liters the container that holds liquid helium 20.
The design of liquid helium level gauge 10 of the present invention must be considered three main points: the heat-transfer capability that (1) is littler will shorten the tranquil stand-by period of liquid helium surface; (2) special Machine Design is with the extraordinary responsive to temperature discoloration coating 3 on the protection elongate articles 2, to avoid any coating infringement when elongate articles 2 immerses and pulls out container 20.(3) temperature of extraordinary responsive to temperature discoloration coating 3 in the processing and manufacturing process must not be higher than 220 degree, disappears forever with the characteristic of avoiding at high temperature extraordinary responsive to temperature variable color.
Liquid helium level gauge 10 of the present invention has carried out surpassing the reliability testing of 100,000 color reversible cycle variations in the university research laboratory of the U.S..Liquid helium level gauge 10 of the present invention may be in the near future becomes a kind of popular tool in the whole world in gas liquefaction industry and many scientific research teams relevant with liquid helium and laboratory in colleges and universities.
To sum up, liquid helium level gauge design of the present invention is ingenious, simple in structure, easy to use, can realize the measurement of liquid helium liquid level rapidly and accurately, is suitable for large-scale promotion application.
In this instructions, the present invention is described with reference to its certain embodiments.But, still can make various modifications and conversion obviously and not deviate from the spirit and scope of the present invention.Therefore, instructions and accompanying drawing are regarded in an illustrative, rather than a restrictive.
Claims (18)
1. liquid helium level gauge, it is characterized in that, comprise gripping member, elongate articles and extraordinary responsive to temperature discoloration coating, described elongate articles comprises first end and the second end, described gripping member is installed in described first end, described extraordinary responsive to temperature discoloration coating is coated on the side of described elongate articles along the length direction of described elongate articles, and described extraordinary responsive to temperature discoloration coating color at normal temperatures is variant with the color in liquid helium.
2. liquid helium level gauge according to claim 1 is characterized in that, described extraordinary responsive to temperature discoloration coating is the phyllosilicate coating.
3. liquid helium level gauge according to claim 2 is characterized in that, the granularity of layered silicate coating is 60～120 orders.
4. liquid helium level gauge according to claim 1 is characterized in that, responsive to temperature color change interval minimum reaching-269 degree of described extraordinary responsive to temperature discoloration coating.
5. liquid helium level gauge according to claim 1, it is characterized in that, the xsect of described elongate articles is circular arc, L shaped, I-shaped, circular, oval, semicircle, rectangle or triangle, and described extraordinary responsive to temperature discoloration coating is coated at least one side of described elongate articles.
6. liquid helium level gauge according to claim 1 is characterized in that, described elongate articles hollow.
7. liquid helium level gauge according to claim 6 is characterized in that, described side is the medial surface of described elongate articles.
8. liquid helium level gauge according to claim 1 is characterized in that, described elongate articles adopts the material of heat-transfer capability difference to make.
9. liquid helium level gauge according to claim 8 is characterized in that, the material of described heat-transfer capability difference is quartz, alloy or timber.
10. liquid helium level gauge according to claim 1 is characterized in that described gripping member is a handle, and described handle extends along the axis direction of described elongate articles.
11. liquid helium level gauge according to claim 1 is characterized in that, the side of described elongate articles is provided with from described the second end initial to the axially extended yardstick coding of described first end.
12. liquid helium level gauge according to claim 11 is characterized in that, described yardstick coding and described extraordinary responsive to temperature discoloration coating do not overlap each other.
13. liquid helium level gauge according to claim 1 is characterized in that, described elongate articles is elongate rod or alloy elongated tubular.
14. liquid helium level gauge according to claim 1 is characterized in that, described elongate articles is provided with groove along its length in the side, and described extraordinary responsive to temperature discoloration coating is positioned at described groove and is coated on the bottom surface of described groove.
15. liquid helium level gauge according to claim 1, it is characterized in that, described elongate articles comprises that elongated cotton cord bar, low temperature contain epoxy layer and compo pipe, described compo pipe is provided with opening along its length, described low temperature contains on the side that epoxy layer is coated on described elongated cotton cord bar, described compo pipe is coated on described low temperature and contains on the side of epoxy layer, and described extraordinary responsive to temperature discoloration coating is positioned at described opening and is coated in exposed described low temperature and contains on the side of epoxy layer.
16. a method of using liquid helium level gauge according to claim 1 to measure the liquid helium liquid level is characterized in that, may further comprise the steps:
(1) holds described gripping member, described elongate articles vertically is inserted into the bottom of the container that holds described liquid helium from the liquid level of liquid helium;
(2) hold described gripping member, and keep described elongate articles not rock, become calmness from fluidized state until described liquid helium;
(3) hold described gripping member, described elongate articles is vertically extracted in described container;
(4) length of variable color part on described elongate rod length direction of the described extraordinary responsive to temperature discoloration coating of measurement, it is the level value of described liquid helium.
17. method according to claim 16, it is characterized in that, the side of described elongate articles is provided with from described the second end initial to the axially extended yardstick coding of described first end, measures described length by described yardstick coding in the described step (4).
18. method according to claim 16 is characterized in that, in described step (2), keeps described elongate articles not rock, and the time that continues is less than 5 seconds.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201010173158 CN101813505A (en) | 2010-04-28 | 2010-04-28 | Liquid helium level gauge and use method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010173158 CN101813505A (en) | 2010-04-28 | 2010-04-28 | Liquid helium level gauge and use method thereof |
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| CN101813505A true CN101813505A (en) | 2010-08-25 |
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| CN 201010173158 Pending CN101813505A (en) | 2010-04-28 | 2010-04-28 | Liquid helium level gauge and use method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103376143A (en) * | 2012-04-13 | 2013-10-30 | 上海联影医疗科技有限公司 | Liquid helium level measurement method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2341533Y (en) * | 1998-08-15 | 1999-10-06 | 应旭昶 | Multifunctional temperature display transparent thermal insulation cup |
| US6712996B2 (en) * | 2000-06-20 | 2004-03-30 | Joseph W. Stucki | Color temperature indicator |
| CN101586976A (en) * | 2009-07-03 | 2009-11-25 | 夏耀民 | The level measurement mechanism of ultralow temperature liquid and level measuring method thereof |
-
2010
- 2010-04-28 CN CN 201010173158 patent/CN101813505A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2341533Y (en) * | 1998-08-15 | 1999-10-06 | 应旭昶 | Multifunctional temperature display transparent thermal insulation cup |
| US6712996B2 (en) * | 2000-06-20 | 2004-03-30 | Joseph W. Stucki | Color temperature indicator |
| CN101586976A (en) * | 2009-07-03 | 2009-11-25 | 夏耀民 | The level measurement mechanism of ultralow temperature liquid and level measuring method thereof |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103376143A (en) * | 2012-04-13 | 2013-10-30 | 上海联影医疗科技有限公司 | Liquid helium level measurement method |
| CN103376143B (en) * | 2012-04-13 | 2015-05-20 | 上海联影医疗科技有限公司 | Liquid helium level measurement method |
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Application publication date: 20100825 |