CN102740512A - Heating device and liquid level detection system for cryogenic liquid - Google Patents
Heating device and liquid level detection system for cryogenic liquid Download PDFInfo
- Publication number
- CN102740512A CN102740512A CN2011100955381A CN201110095538A CN102740512A CN 102740512 A CN102740512 A CN 102740512A CN 2011100955381 A CN2011100955381 A CN 2011100955381A CN 201110095538 A CN201110095538 A CN 201110095538A CN 102740512 A CN102740512 A CN 102740512A
- Authority
- CN
- China
- Prior art keywords
- superconductor
- liquid level
- buoy
- temperature
- low
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Abstract
The invention discloses a heating device and a liquid level detection system for a cryogenic liquid. The heating device is used to heat a superconductor disposed in a cryogenic vessel to measure a liquid level of the cryogenic liquid, the heating device comprises a resistance heater and a buoy connected with the resistance heater. The buoy floating on a surface of the cryogenic liquid can be raised or lowered with changes of the liquid level in the cryogenic vessel, so that the resistance heater can heat the superconductor which is above the liquid level in the cryogenic vessel. The resistance heater can heat the superconductor. The liquid level detection system comprises the above heating device, the superconductor, and a liquid level determining device connected with the superconductor. The heating device and the liquid level detection system can always heat a part of the superconductor above the liquid level and not heat the part of the superconductor under the liquid level. Therefore, volatilization loss of the cryogenic liquid is minimized and liquid level detection sensitivity is improved.
Description
Technical field
The present invention relates to the Level Detection technology, the liquid level detection system of particularly a kind of heater and a kind of cryogenic liquid.
Background technology
At present, in Level Detection, possibly relate to Level Detection, such as normal temperature liquid, high-temp liquid and cryogenic liquid etc. to various liquid.Usually, cryogenic liquid mainly comprises liquefied gas, such as hydrogen, helium and the neon of liquefaction.These cryogenic liquids are often as fuel and cooling fluid in the various applied environments.For example, liquefaction hydrogen can be used as drive system fuel.The boiling point of these cryogenic liquids is very low, and generally about-200 degree, being heated is prone to evaporation, therefore, need in low-temperature (low temperature) vessel (for example Dewar bottle), store and transport usually.In transportation and storage cryogenic liquid, the liquid level that needs to measure cryogenic liquid in the low-temperature (low temperature) vessel is to guarantee fail safe and economic benefit.Yet under these applied environments, because the inherent characteristic (mass density is low, volatile) of cryogenic liquid, traditional liquid level sensor based on capacitive character, Ultrasonic characteristics or hydrodynamics principle does not have accuracy and linear characteristic.Therefore, proposed to utilize superconductor to detect the liquid level of cryogenic liquid at present.Its principle is: utilize the resistance difference of superconductor between superconducting state (R=0) and normal condition (R＞0).Particularly, superconductor is installed in the low-temperature (low temperature) vessel, maintains more than the inversion temperature, promptly maintain normal conducting state through importing that part of superconductor that certain heat energy will be positioned at gaseous environment.Simultaneously, under the refrigeration of cryogenic liquid, that part of superconductor that is positioned at liquid environment remains on superconducting state.Thereby, can calculate liquid level through the resistance of MEASUREMENT IN SUPERCONDUCTOR.
Utilizing superconductor to detect in the process of cryogenic liquid liquid level, how to maintain more than the inversion temperature that part of superconductor in the gaseous environment most important.Method commonly used at present heats superconductor exactly, so that part of superconductor in the gaseous environment maintains more than the inversion temperature.Yet, in these heating means, do not have not only Fast Heating superconductor but also have less volatilizing loss of a kind of heating means.
Summary of the invention
Because above problem, the embodiment of the invention has proposed a kind of heater, is used for heating the superconductor that the cryogenic liquid liquid level is measured that is installed on low-temperature (low temperature) vessel, to reach the Fast Heating superconductor and to guarantee that cryogenic liquid has less volatilizing loss.Further, the embodiment of the invention has also proposed a kind of liquid level detection system of cryogenic liquid.
A kind of heater that the embodiment of the invention provides comprises: resistance heater and the buoy that links to each other with resistance heater; Wherein, buoy swims in the cryogenic liquid surface, can rise or descend along with the variation of liquid level in the said low-temperature (low temperature) vessel, so that said resistance heater heats the superconductor more than the liquid level in the said low-temperature (low temperature) vessel; Resistance heater can heat superconductor.
In one embodiment of the invention, resistance heater covers on the superconductor.
In one embodiment of the invention, resistance heater is wrapped on the superconductor, and first end of resistance heater is fixed on the superconductor or on the low-temperature (low temperature) vessel, second end of resistance heater links to each other with buoy, and the resistance heater two ends link to each other with power supply respectively; When the liquid level of low-temperature (low temperature) vessel rose, buoy rose and rises and the compression resistance heater along with liquid level, and when the liquid level of low-temperature (low temperature) vessel descended, buoy descended and descends and the stretching resistance heater along with liquid level.
In one embodiment of the invention, heater also comprises fixture, and buoy links to each other with second end of resistance heater through fixture.
In one embodiment of the invention, fixture is made up of steel wire, and an end of steel wire ties up on second end of resistance heater, and the other end of steel wire passes through hinge links on buoy.
In one embodiment of the invention; Resistance heater is close on the superconductor; the first surface of buoy is provided with a metal bridge and takes; first end of resistance heater links to each other with an end of a power supply through lead, and on resistance heater, wherein the first surface of buoy is the surface away from cryogenic liquid to the other end of power supply through the metal bridge overlap joint; When the liquid level of low-temperature (low temperature) vessel rose, buoy rose and rises along with liquid level and drive metal bridge and takes along resistance heater and rise, and when the liquid level of low-temperature (low temperature) vessel descended, buoy descended along with liquid level and descends and drive metal bridge and take along resistance heater and descend.
In one embodiment of the invention, buoy can rise and rise along superconductor along with liquid level, perhaps descends along with liquid level and descends along superconductor.
In one embodiment of the invention, buoy can be processed by water-resistant material, and/or the inside of buoy is hollow.
In one embodiment of the invention, buoy can be cylindricality or sphere, and its axis direction has a perforation, and superconductor passes buoy through perforation
The liquid level detection system of a kind of cryogenic liquid that the embodiment of the invention provides comprises: be installed on the superconductor in the low-temperature (low temperature) vessel, above-mentioned heater and the liquid level that is connected with superconductor is confirmed device; Wherein, heater is used for the superconductor more than the low-temperature (low temperature) vessel liquid level is heated; Liquid level is confirmed device, is used for the resistance of MEASUREMENT IN SUPERCONDUCTOR, and confirms the liquid level in the low-temperature (low temperature) vessel according to the resistance of superconductor.
Can find out from above embodiment; Because the use of buoy; Can adjust the heated length of resistance heater according to the variation self adaptation of liquid level to superconductor; Thereby can always heat the above that part of superconductor of liquid level and not heat that part of superconductor below the liquid level, and then drop to minimum to the volatilizing loss of cryogenic liquid.And,, can the superconductor that be covered be heated simultaneously, so firing rate is fast because resistance heater covers on the superconductor to be heated.This shows that the heater of the embodiment of the invention both can improve firing rate, have minimum volatilizing loss again.Correspondingly, because the use of above-mentioned heater, the liquid level measuring system of the embodiment of the invention both can improve the sensitivity of level gauging, can improve the accuracy of level gauging again.
Description of drawings
Fig. 1 is a kind of cross-sectional side view according to the embodiment of the invention;
Fig. 2 is a kind of cross-sectional side view according to the embodiment of the invention;
Fig. 3 is the vertical view according to a kind of heater of the embodiment of the invention;
Fig. 4 is to be the cross sectional representation according to buoy in the heater of the embodiment of the invention;
Fig. 5 is a kind of cross-sectional side view according to the embodiment of the invention;
Fig. 6 is the cross sectional representation of the buoy in the heater shown in Figure 5;
Fig. 7 is the sketch map according to the liquid level detection system of a kind of cryogenic liquid of the embodiment of the invention;
Fig. 8 is for confirming the structural representation of device according to the liquid level of the embodiment of the invention;
Fig. 9 is to be the sketch map of liquid level detection system under the low situation of liquid level according to the cryogenic liquid of the embodiment of the invention;
Figure 10 is to be the sketch map of liquid level detection system under the high situation of liquid level according to the cryogenic liquid of the embodiment of the invention.
Embodiment
To understand in order technical characterictic of the present invention, purpose and effect being had more clearly, to contrast description of drawings embodiment of the present invention at present.Utilizing superconductor to detect in the process of low temperature liquid level, that part of superconductor that how will be positioned at gaseous environment maintains more than the inversion temperature most important.Method commonly used at present heats superconductor exactly, so that part of superconductor in the gaseous environment is maintained more than the inversion temperature.In a kind of therein heating means, through resistance heater whole superconductor is heated, firing rate is fast, and general needs 1 second.But this heating means can also heat that part of superconductor in the cryogenic liquid, thereby cause the volatilizing loss of cryogenic liquid bigger.This shows, at present not only Fast Heating superconductor but also have less volatilizing loss of heating means.
In view of this, the embodiment of the invention has proposed a kind of heater, is used for heating the superconductor that the cryogenic liquid liquid level is measured that is installed on low-temperature (low temperature) vessel, to realize the Fast Heating superconductor and to guarantee that cryogenic liquid has as far as possible little volatilizing loss.Here, superconductor can install along the axis of low-temperature (low temperature) vessel (promptly vertical the installation) perhaps with the angled installation of the axis of low-temperature (low temperature) vessel, the present invention does not do qualification.But, for convenience, in following examples, be installed as example along the axis of low-temperature (low temperature) vessel and describe with superconductor.
Fig. 1 is the cross-sectional side view according to the embodiment of the invention.As shown in Figure 1,10 pairs of this heaters are installed on the superconductor 100 that being used in the low-temperature (low temperature) vessel measure the cryogenic liquid liquid level and heat, and comprising: resistance heater 101 and the buoy 103 that links to each other with resistance heater 101.Wherein, resistance heater 101 can link to each other with heater 10 outside power supplys 102, and perhaps this power supply 102 can be positioned at the inside of heater 10 and link to each other with resistance heater 101.Wherein, buoy 103 swims in the cryogenic liquid surface, can rise or descend along with the variation of the liquid level in the low-temperature (low temperature) vessel, and the above superconductor of the liquid level in 101 pairs of low-temperature (low temperature) vessels of controlling resistance heater heats; Resistance heater 101 can heat superconductor 100.Preferably, resistance heater 101 is covered on the superconductor 100, and when power supply 102 was opened, resistance heater 101 heated the superconductor more than the liquid level in the low-temperature (low temperature) vessel 100 under the control of buoy 103.When resistance heater 101 covers 100 last times of superconductor, not only can improve firing rate, when resistance heater is elastomeric material, can also guarantee better that resistance heater 101 can offset direction when compression.Those skilled in the art are appreciated that according to foregoing description resistance heater also can be arranged side by side with superconductor.
In heater shown in Figure 1, resistance heater 101 can cover superconductor 100 through being wrapped on the superconductor 100, or covers superconductor 100 on the superconductor 100 through being close to.Preferably, resistance heater 101 can vertically be close on the superconductor 100.
When resistance heater 101 covers superconductor 100 through being wrapped on the superconductor 100; One end of resistance heater 101 also is fixed on the conductor 100 or on the low-temperature (low temperature) vessel; buoy 103 links to each other with the other end end of resistance heater 101, and power supply 102 links to each other with resistance heater 101 two ends.Wherein, when the liquid level of low-temperature (low temperature) vessel rose, buoy 103 rose and rises and compression resistance heater 101 along with liquid level, and when the liquid level of low-temperature (low temperature) vessel descended, buoy 103 descended and descends and stretching resistance heater 101 along with liquid level.In the present invention's one preferred embodiments; When the liquid level of low-temperature (low temperature) vessel rose, buoy 103 rose and compression resistance heater 101 along superconductor 100, when the liquid level of low-temperature (low temperature) vessel descends; When the liquid level of low-temperature (low temperature) vessel rose, buoy 103 descended and stretching resistance heater 101 along superconductor 100.Resistance heater 101 under the control of buoy 103, twine the above superconductor 100 of liquid level in the low-temperature (low temperature) vessel, and when power supply 102 was opened, the superconductor 100 that resistance heater 101 is twined heated.
When resistance heater 101 covers superconductor 100 through being close on the superconductor 100; the buoy 103 first surfaces surface of cryogenic liquid (promptly away from) comprise that a metal bridge takes; the end that metal bridge is taken links to each other with an end of power supply 102 through lead and the other end overlaps on resistance heater 101, the other end of power supply 102 is directly connected to the top of resistance heater 101 through lead.Wherein, When the liquid level of low-temperature (low temperature) vessel rises; buoy 103 rises and rises along with liquid level and drive metal bridge and takes along resistance heater 101 and rise, when the liquid level of low-temperature (low temperature) vessel descended, buoy 103 descended along with liquid level and descends and drive metal bridge and take along resistance heater 101 and descend.In the present invention's one preferred embodiments; When the liquid level of low-temperature (low temperature) vessel rises; buoy 103 rises and drives metal bridge along superconductor 100 and takes along resistance heater 101 and rise; when the liquid level of low-temperature (low temperature) vessel descends, buoy 103 descends and drives metal bridge along superconductor 100 and takes along resistance heater 101 and descend.When power supply 102 was opened, resistance heater 101 was taken above superconductor 100 to metal bridge and is heated under the control of buoy 103.
In above embodiment,, can the superconductor that be covered be heated simultaneously, so firing rate is fast because resistance heater covers on the superconductor to be heated.And; Because the use of buoy; Can adjust the heated length of resistance heater according to the variation self adaptation of liquid level to superconductor; Thereby can always heat the above that part of superconductor of liquid level and not heat that part of superconductor below the liquid level, and then reduce the volatilizing loss of cryogenic liquid as much as possible.This shows that the technical scheme of the embodiment of the invention had both improved firing rate, have less volatilizing loss again.
Below will combine accompanying drawing that heater of the present invention is done more detailed description.
Fig. 2 is the cross-sectional side view according to the embodiment of the invention.As shown in Figure 2; Resistance heater 101 covers superconductor 100 through being wrapped on the superconductor 100; This heater heats vertically being installed on the superconductor 100 that being used in the low-temperature (low temperature) vessel 110 measure the cryogenic liquid liquid level; Comprise: resistance heater 101, the buoy 103 that links to each other with the bottom of resistance heater 101.Further, the two ends of resistance heater 101 can also link to each other with power supply 102.Wherein, resistance heater 101 be wrapped on the superconductor 100 and the top be fixed on the superconductor 100 or low-temperature (low temperature) vessel 110 on.When power supply 102 was opened, resistance heater 101 heated that part of superconductor that it twined.Buoy 103 swims in the cryogenic liquid surface; When the liquid level of low-temperature (low temperature) vessel 110 rises; buoy 103 rises and compression resistance heater 101 along superconductor 100, when the liquid level of low-temperature (low temperature) vessel 110 descended, buoy 103 descended and stretching resistance heater 101 along superconductor 100.
Through above heater, resistance heater 101 is wrapped on the superconductor 100, and therefore after power supply 102 was opened, resistance heater 101 just can heat that part of superconductor 100 that it twined apace.Simultaneously, buoy 103 changes along with liquid level change, thereby makes the length of the resistance heater 101 that links to each other with buoy 103 also change along with liquid level change.And because buoy 103 always swims in the surface of cryogenic liquid, so resistance heater 101 can not immerse in the cryogenic liquid.Thereby resistance heater 101 can not bring too big volatilizing loss to cryogenic liquid.
In the embodiment of the invention, resistance heater 101 has elastic characteristic, so that stretch and compression.Resistance heater 101 can be the thin wire that conducting metal is processed; The resistance heater 101 of thin wire type is wrapped on the superconductor 100; The pitch of twining can be decided according to the length of superconductor 100; And pitch is short more close more then heating time, so pitch can also require to decide according to firing rate.When power supply 102 starts, the electric current resistance heater 101 of flowing through.Because the resistance characteristic of resistance heater 101, the inside of resistance heater 101 can produce Joule heat.The Joule heat that distributes heats that part of superconductor 100 that resistance heater 101 is twined.When the temperature of heated that part of superconductor 100 when its inversion temperature is above, this part superconductor 100 is in normal conducting state, promptly resistance R is greater than 0.And that part of superconductor 100 in the cryogenic liquid is in superconducting state under the cooling effect of cryogenic liquid, and promptly resistance R is almost 0.Because resistance heater 101 heats that part of superconductor 100 that it twined simultaneously, so firing rate is fast.
According to the embodiment of the invention; buoy 103 can be the buoy of being processed by water-resistant material (hydrophobic material) with constant weight; such as polypropylene, polyethylene, polyester fiber, polyvinyl chloride etc.; always swim in the surface of the cryogenic liquid in the low-temperature (low temperature) vessel 110 to guarantee buoy 103, the relative altitude of it and low-temperature (low temperature) vessel 110 changes along with level fluctuation.Preferably, buoy 103 can directly be fixed on the bottom (not illustrating at Fig. 2) of resistance heater 101; Perhaps, heater also comprises fixture 104, is used for buoy 103 is connected to the bottom of resistance heater 101.Like this, resistance heater 101 connects into an integral body with buoy 103.When liquid level reduced, because action of gravity, resistance heater 101 was stretched by buoy 103; On the contrary, when liquid level raise, because the buoyancy that increases gradually, resistance heater 101 was by buoy 103 compressions.Thereby; The length of resistance heater 101 adapts to adjustment with the fluctuation of liquid level; Always twine that part of superconductor 100 on the liquid level and can not twine that part of superconductor 100 below the liquid level; Guarantee resistance heater 101 not to 100 heating of that part of superconductor below the liquid level, thereby avoid increasing the volatilizing loss of cryogenic liquid.
According to the embodiment of the invention, when heater also comprised fixture 104, fixture 104 can comprise one or many steel wires, and an end of steel wire ties up to the bottom of resistance heater 101, and the other end is through the upper surface of hinge links at buoy 103.Preferably, steel wire by hardness big and lightweight material process, such as nylon or fiber-enhanced plastic, resistance heater 101 is tightly linked to each other with buoy 103 and don't apply too big load can for resistance heater 101.The fixture 104 of the embodiment of the invention can also be made up of other materials, and is not limited to steel wire.
The density that it should be noted that some cryogenic liquids is minimum, and for example: the density 0.07g/cm3 of hydrogen, the density 0.146g/cm3 of helium, therefore, the buoyancy of these cryogenic liquids is very little.Therefore, need carry out particular design so that weak buoyancy is compensated to resistance heater 101 and buoy 103.At first, the density of buoy 103 should be very little and its inside be the vacuum structure of hollow, thereby so that buoy 103 enough gently can swim in the surface of cryogenic liquid.The design demand of buoy 103 internal structures is calculated according to the buoy material.Suppose that the density of buoy material is ρ
1, the density of cryogenic liquid is ρ
2, buoy solid section volume is V
1, the vacuum section volume is V
2As long as then satisfy ρ
1V
1＜=ρ
2(V
1+ V
2) just can make buoy 103 swim in the surface of cryogenic liquid.Here; the density of buoy 103 also can also can be greater than the density of the cryogenic liquid in the low-temperature (low temperature) vessel 110 less than the density of the cryogenic liquid in the low-temperature (low temperature) vessel 110;, promptly satisfy ρ as long as guarantee that buoy 103 is immersed in gravity suffered in the cryogenic liquid smaller or equal to its suffered buoyancy
1V
1＜=ρ
2(V
1+ V
2).Secondly; Though the bottom of resistance heater 101 can be stretched by buoy 103; But; Because its top need be fixed on low-temperature (low temperature) vessel 110 or the superconductor 100, so the weight of resistance heater 101 (with fixture 104) can not be applied on the buoy 103, do not swim on the liquid level thereby can not influence buoy 103.At last, resistance heater 101 should have less hardness, so that can be stretched like a cork by lightweight buoy 103.
According to the embodiment of the invention, buoy 103 can have any shape, and such as cylindricality or sphere, and its axis direction has a perforation, and superconductor 100 passes buoy 103 by this perforation.Thereby resistance heater 101 just can elongate or shorten along superconductor 100 directions along with the stretching or the compression of buoy 103.
Compare with existing heating means, the heater of the embodiment of the invention has following advantage:
A) in the embodiment of the invention; Be not resistance heater to be covered on the whole superconductor (comprise the superconductor that is arranged in gaseous environment and liquid environment); But the length through buoy controlling resistance heater makes resistance heater only cover that part of superconductor of gaseous environment in the low-temperature (low temperature) vessel.Like this, no matter how the liquid level in the low-temperature (low temperature) vessel changes that part of superconductor that resistance heater always covers and only covering is arranged in gaseous environment.Therefore, can guarantee that part of superconductor in the gaseous environment by Fast Heating, and get into normal conducting state fast.Simultaneously, because resistance heater has alleviated the influence of joule's heat energy to cryogenic liquid, thereby has reduced the volatilizing loss of cryogenic liquid not directly to being arranged in that part of superconductor heating of liquid environment.
B) embodiment of the invention need not any extra detection and driving mechanism; And only need buoy to realize (preferably also comprising fixture) the self adaptation length adjustment of resistance heater, thereby realize self adaptation heating to that part of superconductor that is arranged in gaseous environment.Particularly, the length of resistance heater will change according to the height and position of buoy in low-temperature (low temperature) vessel.And when buoy swam in cryogenic liquid surperficial, the height of liquid level was depended in its position, so in fact the length of resistance heater can change along with the fluctuation of liquid level automatically, and need not any other detection information or extra energy input.Therefore, the heater of the embodiment of the invention under the prerequisite that guarantees Fast Heating and minimum volatilizing loss, also has cost advantage low, simple in structure and easy to use.
Can find out by above analysis; The heater of the embodiment of the invention can carry out adaptive heating to the superconductor that is used to measure the cryogenic liquid liquid level; Have concurrently and heat fast, the little advantage of volatilizing loss; And cost is low, simple in structure, can be widely used in the superconductor heating in the level gauging of cryogenic liquid.
Fig. 3 is the vertical view according to a kind of heater of the embodiment of the invention.Like Fig. 2, in this embodiment, buoy 103 is a spheroidal, and its axis direction has a perforation, is used to let superconductor 100 pass buoy 103.In the present embodiment, heater comprises fixture 104, and it is made up of 4 steel wires 201,202,203 and 204.One end of these 4 steel wires is linked to respectively on the buoy 103, and the other end is tied to the different parts of resistance heater 101 (not illustrating at Fig. 2).Preferably, 4 steel wires 201,202,203 and 204 are linked to the upper surface of buoy 103 equably, and are even to the active force of buoy to guarantee four steel wires.At steel wire 201,202, under 203 and 204 the effect, buoy 103 links together with resistance heater 101 tightly.
Fig. 4 is to be the cross sectional representation according to the buoy of the embodiment of the invention.As shown in Figure 3, the inside of buoy 103 is hollow (like 1031 among figure), has the minimum and lightweight characteristics of density with assurance buoy 103, thereby can swim on the cryogenic liquid of similar hydrogen and helium.Further, the inside of buoy 103 is vacuum.And buoy 103 axis directions have a perforation 1032, to let superconductor 100 pass buoy 103.The aperture of perforation 1032 is greater than the diameter of superconductor 100.
In the heater that above embodiment describes; Because the length of resistance heater 101 is variable, only covers the above superconductor 100 of liquid level, and the superconductor 100 that it covered is heated; Therefore not only can the Fast Heating superconductor, and can guarantee minimum volatilizing loss.
Fig. 5 is the signal according to a kind of heater of the embodiment of the invention.As shown in Figure 5; Resistance heater 101 covers superconductor 100 through vertically being close on the superconductor 100; This moment, buoy 103 upper surfaces comprised that a metal bridge takes 105; Power supply 102 1 ends are directly connected to the top of resistance heater 101 through lead, and the other end is taken 105 overlap joints on resistance heater 101 through metal bridge.Like this, when the liquid level of low-temperature (low temperature) vessel 110 rose, buoy 103 rose and drives metal bridge along superconductor 100 and takes 105 along resistance heater 101 risings; Otherwise when the liquid level of low-temperature (low temperature) vessel descended, buoy 103 descended and drives metal bridge along superconductor 100 and takes 105 along resistance heater 101 declines.When power supply 102 is opened; Metal bridge take more than 105 that disconnect resistance heater 101 can with power supply 102 formation loops; And that resistance heater 101 of disconnecting that metal bridge is taken below 105 does not have electric current to pass through; So can not generate heat, thereby make resistance heater 101 under the control of buoy 103, heat, and the superconductor 100 of metal bridge not being taken (being in the cryogenic liquid) below 105 heat to the superconductor 100 that metal bridge is taken more than 105.
Fig. 6 is the cross sectional representation of the buoy in the heater shown in Figure 5.As can beappreciated from fig. 6; The buoy design class of the buoy of Fig. 5 and Fig. 2 seemingly; Difference only is: the buoy of Fig. 5 is taken 105 through metal bridge and is connected with resistance heater 101 and power supply 102, controls the heated length to superconductor 100 through the energising length of controlling 102 pairs of resistance heaters 101 of power supply; And the buoy of Fig. 2 links to each other with the bottom of resistance heater 101 through fixture 104, controls the heated length to superconductor 100 through the coiling length of 101 pairs of superconductors 100 of controlling resistance heater.
Compare with existing heating means, the heater shown in the chromosome 5 has following advantage:
A) the energising length through buoy controlling resistance heater makes that resistance heater energising of having only gaseous environment in the low-temperature (low temperature) vessel, thereby only that part of superconductor of gaseous environment in the low-temperature (low temperature) vessel is heated.Like this, no matter how the liquid level in the low-temperature (low temperature) vessel changes, and has only that part of resistance heater energising in the gaseous environment, thereby only to that part of superconductor heating in the gaseous environment.Therefore, can guarantee that part of superconductor in the gaseous environment by Fast Heating, and get into normal conducting state fast.Simultaneously, because resistance heater has alleviated the influence of joule's heat energy to cryogenic liquid, thereby has reduced the volatilizing loss of cryogenic liquid not directly to being arranged in that part of superconductor heating of liquid environment.
B) need not any extra detection and driving mechanism, and only need buoy to realize the self adaptation adjustment of the heated length of resistance heater, thereby realize self adaptation heating that part of superconductor that is arranged in gaseous environment.When buoy swam in cryogenic liquid surperficial, the height of liquid level was depended in its position, so in fact the heated length of resistance heater can change along with the fluctuation of liquid level automatically, and need not any other detection information or extra energy input.Therefore, the heater of the embodiment of the invention under the prerequisite that guarantees Fast Heating and minimum volatilizing loss, also has cost advantage low, simple in structure and easy to use.
In addition; Utilizing superconductor to detect in the process of cryogenic liquid liquid level at present; Need that part of superconductor that be positioned at gaseous environment be heated, and traditional heating means or because can not the Fast Heating superconductor, and cause the response speed of Level Detection slow; Cause bigger volatilizing loss thereby also cryotron liquid is heated simultaneously, and then cause the accuracy of Level Detection low.In order to solve this problem that traditional liquid level detects; And seeing that the advantage of the heater of above embodiment; The embodiment of the invention has proposed a kind of liquid level detection system that utilizes the cryogenic liquid of this heater, and it comprises: vertically be installed on the superconductor in the low-temperature (low temperature) vessel, above-mentioned heater and the liquid level that is connected with superconductor and confirm device.Wherein, heater is used for the superconductor more than the low-temperature (low temperature) vessel liquid level is heated, with the temperature maintenance of the superconductor more than the liquid level more than the inversion temperature of superconductor; Liquid level is confirmed device, is used for the resistance of MEASUREMENT IN SUPERCONDUCTOR, and confirms the liquid level in the low-temperature (low temperature) vessel according to the resistance of superconductor.Because this heater always heats the superconductor more than the liquid level, and the superconductor below the liquid level is not heated when the heating superconductor; Can the Fast Heating superconductor; Make soon, and because the volatilizing loss of cryogenic liquid is very little, the accuracy of Level Detection is high to the liquid level change reaction.
Below will combine accompanying drawing that the liquid level detection system of the cryogenic liquid of the embodiment of the invention is elaborated.
Fig. 7 is the sketch map according to the liquid level detection system of a kind of cryogenic liquid of the embodiment of the invention.As shown in Figure 7; Present embodiment is the liquid level detection system that example is explained this cryogenic liquid with heater shown in Figure 2; The liquid level detection system of this cryogenic liquid comprises: vertically be installed on the superconductor 100 in the low-temperature (low temperature) vessel 110; The heater that links to each other with superconductor 100, and the liquid level that is connected with superconductor 100 is confirmed device 401.Wherein, The connected mode of heater and superconductor 100 is following: the resistance heater 101 of heater twines on the superconductor 100 and the top is fixed on the superconductor 100 or on the low-temperature (low temperature) vessel 110, the buoy 103 that links to each other with the bottom of resistance heater 101 in the heater swims in the cryogenic liquid surface in the low-temperature (low temperature) vessel 110.
Wherein, superconductor 100 is the sensers that are used for measuring the liquid level of low-temperature (low temperature) vessel 110 cryogenic liquids, the thin wire that can be processed by MgB, NbTi or other superconductors.When the liquid level of low-temperature (low temperature) vessel 110 rose, buoy 103 rose and compression resistance heater 101 along superconductor 100, and when the liquid level of low-temperature (low temperature) vessel 110 descended, buoy 103 descended and stretching resistance heater 101 along superconductor 100; Under the effect of the compression of buoy 103 or stretching; Resistance heater 101 covers the above that part of superconductor 100 of liquid level; When coupled power supply 102 is opened; That part of superconductor 100 to it covered heats, with the temperature maintenance of this part superconductor more than the inversion temperature of superconductor 100; Liquid level is confirmed the resistance of device 401 MEASUREMENT IN SUPERCONDUCTOR 100 and is confirmed the liquid level in the low-temperature (low temperature) vessel 110 according to the resistance of superconductor 100.
According to the embodiment of the invention, superconductor 100 is the leads of diameter 10 μ m to 500 μ m, length be 0.2m to 2m, concrete length can confirm according to the height of low-temperature (low temperature) vessel, generally greater than the height of low-temperature (low temperature) vessel.
Be the liquid level detection system that example is explained this cryogenic liquid with heater shown in Figure 2 among Fig. 7, also can be used for the liquid level detection system of cryogenic liquid, and principle and Fig. 7 are similar, repeat no more at this for heater shown in Figure 5.
Fig. 8 is for confirming the structural representation of device according to the liquid level of the embodiment of the invention.As shown in Figure 8, liquid level confirms that device 401 can comprise power supply 4011 and voltage or current measure device 4012, and the two is connected with the top of superconductor 100 respectively.Current source 4011 is used to superconductor 100 power supplies, and voltage or current measure device 4012 are used for the voltage or the electric current of MEASUREMENT IN SUPERCONDUCTOR 100, thereby the resistance of superconductor 100 can be derived from voltage or current measure device 4012 measurement results.When power supply 102 is opened or after opening, power supply 4011 unlatchings, voltage or current measure device 4012 are also opened afterwards.And when power supply 102 is opened, the electric current resistance heater 101 of will flowing through.Since the resistance characteristic of resistance heater 101, its inner Joule heat that therefore produces.That part of superconductor 100 more than the liquid level that the Joule heat that distributes is covered with resistance heater 102 heats, and makes it remain on normal conducting state.Buoy 103 swims in the surface of cryogenic liquid, and the above superconductor 100 of 101 pairs of liquid levels of controlling resistance heater heats.With Fig. 2 heater is example, and when the cryogenic liquid liquid level in the low-temperature (low temperature) vessel 110 reduced, buoyancy descended thereupon, and buoy 103 also just descends, thereby stretching resistance heater 101 is to cover that part of superconductor 100 that newly is exposed in the gaseous environment; And when the cryogenic liquid liquid level in the low-temperature (low temperature) vessel 110 raise, buoy 103 rose along with the rising of liquid level, thereby resistance heater 101 is compressed to new elastic force and buoyant equilibrium point.Simultaneously, because the rising of liquid level, that part of superconductor 100 that is positioned under the gaseous environment that resistance heater 101 covers has also tailed off.Therefore, the covering of 101 pairs of superconductors 100 of resistance heater can be according to the liquid level of cryogenic liquid and adjustment automatically, and without any need for peripheral operation, that is to say, can carry out the self adaptation heating to superconductor 100.
Preferably, wherein power supply 4011 can be current source.Liquid level confirms that device 401 can also comprise liquid level calculating display module 4013; Be used for confirming the liquid level of low-temperature (low temperature) vessel according to the resistance value of superconductor 100; Be specially: R=U/I; Wherein R is the resistance of superconductor 100, and U is the magnitude of voltage that voltage measuring apparatus 4012 is read, and I is the electric current that power supply 4011 provides; Owing to R=resistivity * L/S, wherein L is the length of conductor again, and S is the cross section joint of conductor, then can extrapolate the length L more than the liquid level that is positioned at of superconductor, thereby can extrapolate the liquid level of low-temperature (low temperature) vessel, and the liquid level of confirming is shown to the user.
In the embodiment of the invention, the concrete design of heater is similar with above embodiment, and present embodiment repeats no more.
Fig. 9 is to be the sketch map of liquid level detection system under the low situation of liquid level according to the cryogenic liquid of the embodiment of the invention.As shown in Figure 9, along with liquid level in the low-temperature (low temperature) vessel 110 reduces, the superconductor 100 that is positioned at gaseous environment in the low-temperature (low temperature) vessel 110 is also elongated, and the volume that buoy 103 is positioned at below the liquid level reduces, and buoy 103 suffered buoyancy also reduce as a result.In order to keep the dynamic balance of buoy 103, resistance heater 101 should have the buoyancy that bigger upwards elastic force reduces with compensation to buoy 103, so resistance heater 101 can further prolong downwards, and promptly resistance heater 101 descends with liquid level and by to stretched.Therefore, resistance heater 101 always covers the superconductor 100 in the gaseous environment.Fig. 9 is that example describes with the heater shown in Fig. 2, and heater operation principle and Fig. 9 shown in Figure 5 are similar, repeat no more at this.
Figure 10 is to be the sketch map of liquid level detection system under the high situation of liquid level according to the cryogenic liquid of the embodiment of the invention.Shown in figure 10, along with liquid level in the low-temperature (low temperature) vessel 110 rises, the superconductor 100 that is positioned at gaseous environment in the low-temperature (low temperature) vessel 110 shortens thereupon, and the volume that is immersed in the buoy 103 in the liquid becomes big, this means that the buoyancy that liquid produces becomes big.In order to compensate the buoyancy of increase, the elastic force that resistance heater 101 provides reduces, to keep the dynamic balance of buoy 103.Therefore, resistance heater 101 shortens, thereby only covers that part of superconductor 100 that is arranged in gaseous environment.Figure 10 is that example describes with the heater shown in Fig. 2, and heater operation principle and Figure 10 shown in Figure 5 are similar, repeat no more at this.
Can find out that from above embodiment owing to adopted the heater that can realize the self adaptation heating, the liquid level detection system of cryogenic liquid has following advantage:
(1) response fast; The heated length of the resistance heater in the heater changes along with liquid level change, and resistance heater is covered with superconductor, and can only heat that part of superconductor more than the liquid level.Therefore, the above that part of superconductor of liquid level can be heated by the resistance heater that is covered with simultaneously, thereby can switch to normal conducting state fast.Utilize this characteristic, the liquid level detection system of cryogenic liquid can be made quick response to the quick interpolation and the output of cryogenic liquid.
(2) high accuracy.At first, under the effect of buoy, in the Level Detection process, no matter liquid level rises is still reduced, and resistance heater always heats the superconductor more than the liquid level.Therefore, greatly reduced the influence of the joule's heat energy that resistance heater radiated to cryogenic liquid.Compare with external heat type transducer, volatilizing loss has reduced and accuracy has also improved.Secondly, because response fast, the liquid level detection system of cryogenic liquid of the present invention still can in time react under the extremely low situation of level fluctuation fierceness or liquid level.On the contrary, traditional inside hot type transducer needs the long period just can conduct heat to that part of superconductor in the gaseous environment, begins to detect liquid level then, and therefore detecting output possibly just can reflect liquid level after several seconds.
(3) low cost.The liquid level detection system of cryogenic liquid of the present invention has the simple structure of the liquid level sensor that is similar to existing superconduction cryogenic liquid.Uniquely be not both, for resistance heater has increased a heater with self adaptation length adjustment mechanism.Has a buoy in this self adaptation length adjustment mechanism.Realize the testing mechanism that the heating of this self adaptation need not to add or the extra energy, all functions all are to be accomplished by the gravity of buoy and buoyancy of liquid, so development cost is low.
Another embodiment of the present invention has also proposed a kind of heating means, is used for the superconductor that is used to measure the cryogenic liquid liquid level that vertically is installed on low-temperature (low temperature) vessel is heated.This method comprises:
In advance resistance heater is covered on the superconductor, resistance heater is linked to each other with power supply, and with resistance heater with swim in the lip-deep buoy of cryogenic liquid and link to each other;
The power supply that unlatching links to each other with resistance heater; Buoy is along with the liquid level of low-temperature (low temperature) vessel rises or descends, and the controlling resistance heater heats the superconductor more than the liquid level in the low-temperature (low temperature) vessel.
When utilizing heater shown in Figure 2 to heat; This method is specially: in advance resistance heater is wound in the superconductor surface, is fixed on the superconductor top of resistance heater or on the low-temperature (low temperature) vessel, the bottom of resistance heater is linked to each other with the buoy that swims in the cryogenic liquid surface;
The power supply that unlatching links to each other with the resistance heater two ends; When the liquid level of low-temperature (low temperature) vessel rises; buoy is along superconductor direction compression resistance heater, and resistance heater is in the rising of the compression lower edge of buoy superconductor direction and cover that part of superconductor more than the liquid level, to the superconductor heating that is covered; When the liquid level of low-temperature (low temperature) vessel descended, buoy was along superconductor direction stretching resistance heater, and resistance heater is in the decline of the stretching lower edge of buoy superconductor direction and cover the superconductor more than the liquid level, to the superconductor heating that is covered.
When utilizing heater shown in Figure 5 to heat; This method is specially: in advance that resistance heater is vertical, be close to the superconductor in the low-temperature (low temperature) vessel; the buoy upper surface comprises that a metal bridge takes; power supply one end is directly connected to the top of resistance heater through lead, the other end through the metal bridge overlap joint on resistance heater;
When the liquid level of low-temperature (low temperature) vessel rose, buoy rose and drives metal bridge along superconductor and takes along the resistance heater rising, and metal bridge is taken above resistance heater metal bridge is taken above superconductor heating; When the liquid level of low-temperature (low temperature) vessel descended, buoy descended and drives metal bridge along superconductor and takes along resistance heater decline, and metal bridge is taken above resistance heater metal bridge is taken above superconductor heating.
The heating means of the embodiment of the invention can the Fast Heating superconductor, and has minimum volatilizing loss.
Another embodiment of the present invention has proposed a kind of liquid-level detecting method of cryogenic liquid; In advance resistance heater is covered on the superconductor that vertically is installed in the low-temperature (low temperature) vessel; Resistance heater is linked to each other with power supply, and resistance heater is linked to each other with the buoy that swims in the cryogenic liquid surface;
The power supply that unlatching links to each other with resistance heater; Buoy is along with the liquid level of low-temperature (low temperature) vessel rises or descends, and the controlling resistance heater is heated to more than the inversion temperature of superconductor to the superconductor more than the liquid level in the low-temperature (low temperature) vessel; The liquid level that links to each other with superconductor confirms that device confirms the resistance of superconductor, and confirms the liquid level in the low-temperature (low temperature) vessel according to the resistance of superconductor.
When utilizing heater shown in Figure 2 to heat; This method is specially: in advance resistance heater is covered in the superconductor surface that is vertically mounted in the low-temperature (low temperature) vessel, is fixed on the superconductor top of resistance heater or on the low-temperature (low temperature) vessel, with the bottom of resistance heater with swim in the lip-deep buoy of cryogenic liquid and link to each other; The power supply that unlatching links to each other with the resistance heater two ends; When the liquid level of low-temperature (low temperature) vessel rises; buoy is along superconductor direction compression resistance heater; resistance heater is in the rising of the compression lower edge of buoy superconductor direction and cover that part of superconductor more than the liquid level, the superconductor that is covered is heated to more than the inversion temperature of superconductor; When the liquid level of low-temperature (low temperature) vessel descends; buoy is along superconductor direction stretching resistance heater; resistance heater is in the decline of the stretching lower edge of buoy superconductor direction and cover the superconductor more than the liquid level, the superconductor that is covered is heated to more than the inversion temperature of superconductor; Liquid level confirms that device confirms the resistance of superconductor, and confirms the liquid level in the low-temperature (low temperature) vessel according to the resistance of superconductor.
When utilizing heater shown in Figure 5 to heat; This method is specially: in advance resistance heater is wound in the superconductor surface that is vertically mounted in the low-temperature (low temperature) vessel, the top of resistance heater is fixed on superconductor or the low-temperature (low temperature) vessel, with the bottom of resistance heater with swim in the lip-deep buoy of cryogenic liquid and link to each other; When the liquid level of low-temperature (low temperature) vessel rises; buoy is along superconductor direction compression resistance heater; resistance heater is in the rising of the compression lower edge of buoy superconductor direction and twine that part of superconductor more than the liquid level, and the superconductor that is twined is heated to more than the inversion temperature of superconductor; When the liquid level of low-temperature (low temperature) vessel descends; buoy is along superconductor direction stretching resistance heater; resistance heater is in the decline of the stretching lower edge of buoy superconductor direction and twine the superconductor more than the liquid level, the superconductor that is twined is heated to more than the inversion temperature of superconductor; The liquid level that links to each other with superconductor confirms that device confirms the resistance of superconductor, and confirms the liquid level in the low-temperature (low temperature) vessel according to the resistance of superconductor.
In the liquid-level detecting method of the cryogenic liquid of the embodiment of the invention,, therefore can make quick response to liquid level change owing to can make it get into superconducting state by the Fast Heating superconductor; And owing to have minimum volatilizing loss, cryogenic liquid is not volatile, and is therefore more accurate to the detection of liquid level in the low-temperature (low temperature) vessel.
Embodiments of the invention provide the liquid level detection system of a kind of heater and a kind of cryogenic liquid.This heater is used for heating the superconductor that the cryogenic liquid liquid level is measured that is installed on low-temperature (low temperature) vessel, and comprises: resistance heater and the buoy that links to each other with resistance heater.Wherein, buoy swims in the cryogenic liquid surface, can rise or descend along with the variation of liquid level in the low-temperature (low temperature) vessel, so that resistance heater heats the superconductor more than the liquid level in the low-temperature (low temperature) vessel; Resistance heater can heat superconductor.Liquid level detection system comprises that above-mentioned heater, superconductor and the liquid level that links to each other with superconductor confirm device.Through this heater and liquid level detection system, can always heat the above that part of superconductor of liquid level and do not heat that part of superconductor liquid level below, thereby drop to minimum to the volatilizing loss of cryogenic liquid, the sensitivity of raising Level Detection.
Preceding text have carried out detail and explanation through accompanying drawing and embodiment to the present invention, yet the invention is not restricted to the embodiment that these have disclosed, and other schemes that those skilled in the art therefrom derive out are also within protection scope of the present invention.
Claims (11)
1. heater is used for the superconductor (100) that the cryogenic liquid liquid level is measured that heating is installed on low-temperature (low temperature) vessel (110), and said heater (10) comprising: resistance heater (101) and the buoy (103) that links to each other with said resistance heater (101); Wherein,
Said buoy (103) swims in said cryogenic liquid surface; Can be along with the variation of liquid level in the said low-temperature (low temperature) vessel (110) be risen or is descended, so that said resistance heater (101) only heats the above superconductor of the liquid level in the said low-temperature (low temperature) vessel (110);
Said resistance heater (101) can heat said superconductor (100).
2. heater according to claim 1, wherein, said resistance heater (101) covers on the said superconductor (100).
3. heater according to claim 2, wherein,
Said resistance heater (101) is wrapped on the said superconductor (100); And first end of said resistance heater (101) is fixed on the said superconductor on (100) or the said low-temperature (low temperature) vessel (110); Second end of said resistance heater (101) links to each other with said buoy (103), and first end of said resistance heater (101) links to each other with a power supply (102) respectively with second end;
When the liquid level of said low-temperature (low temperature) vessel (110) rises; Said buoy (103) rises along with the liquid level rising and compresses said resistance heater (101); When the liquid level of low-temperature (low temperature) vessel (110) descended, said buoy (103) descended and descends and the said resistance heater (101) that stretches along with liquid level.
4. heater according to claim 3, wherein, said buoy (103) rises along with liquid level and rises along said superconductor (100), perhaps descends along with liquid level and descends along said superconductor (100).
5. heater according to claim 3, wherein, said heater (10) also comprises fixture (104), said buoy (103) links to each other through second end of said fixture (104) with said resistance heater (101).
6. heater according to claim 5, wherein, said fixture (104) is made up of steel wire, and an end of steel wire ties up on second end of said resistance heater (101), and the other end of said steel wire passes through hinge links on said buoy (103).
7. heater according to claim 2; Wherein, Said resistance heater (101) is close on the said superconductor (100); The first surface of said buoy (103) is provided with a metal bridge and takes (105); First end of said resistance heater (101) links to each other with an end of a power supply (102) through lead, and the other end of said power supply (102) is taken (105) overlap joint on said resistance heater (101) through said metal bridge, and the first surface of wherein said buoy (103) is the surface away from said cryogenic liquid;
When the liquid level of said low-temperature (low temperature) vessel (110) rises; Said buoy (103) rises and rises and drive said metal bridge and take (105) along said resistance heater (101) rising along with liquid level; When the liquid level of low-temperature (low temperature) vessel (110) descended, said buoy (103) descended and drives said metal bridge along with liquid level decline and takes (105) along said resistance heaters (101) decline.
8. heater according to claim 7, wherein, said buoy (103) rises along with liquid level and rises along said superconductor (100), perhaps descends along with liquid level and descends along said superconductor (100).
9. heater according to claim 1, wherein, said buoy (103) is processed by water-resistant material, and/or the inside of said buoy is hollow.
10. heater according to claim 1, wherein, said buoy (103) is cylindricality or sphere, and its axis direction has a perforation, said superconductor (100) passes said buoy through said perforation.
11. the liquid level detection system of a cryogenic liquid, the liquid level detection system of said cryogenic liquid comprises: be installed on superconductor (100) in the low-temperature (low temperature) vessel (110), confirm device (401) according to each described heater (10) among the claim 1-10 and the liquid level that is connected with said superconductor (100);
Said heater (10) is used for the above superconductor (100) of said low-temperature (low temperature) vessel (110) liquid level is heated;
Said liquid level is confirmed device (401), is used to measure the resistance of said superconductor (100), and confirms the liquid level in the said low-temperature (low temperature) vessel (110) according to the resistance of superconductor (100).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100955381A CN102740512A (en) | 2011-04-15 | 2011-04-15 | Heating device and liquid level detection system for cryogenic liquid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100955381A CN102740512A (en) | 2011-04-15 | 2011-04-15 | Heating device and liquid level detection system for cryogenic liquid |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102740512A true CN102740512A (en) | 2012-10-17 |
Family
ID=46995039
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011100955381A Pending CN102740512A (en) | 2011-04-15 | 2011-04-15 | Heating device and liquid level detection system for cryogenic liquid |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102740512A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103090925A (en) * | 2013-01-24 | 2013-05-08 | 中国科学院电工研究所 | Liquid nitrogen liquid level indicator |
| CN105387912A (en) * | 2015-12-11 | 2016-03-09 | 东莞市天倬电器有限公司 | Water level detection system |
| CN106017615A (en) * | 2016-07-20 | 2016-10-12 | 哈尔滨今星微电子科技有限公司 | Absolute level meter |
| CN110132371A (en) * | 2019-04-23 | 2019-08-16 | 天津大学 | A kind of superconduction liquidometer for cryogenic cooling liquid liquid level monitoring |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1989002583A1 (en) * | 1987-09-07 | 1989-03-23 | Institut Für Physik Der Universität Basel | Level indicator for cryogenic fluids |
| JPH01237419A (en) * | 1988-03-17 | 1989-09-21 | Nkk Corp | Method and apparatus for measuring liquid level |
| US5908985A (en) * | 1995-03-31 | 1999-06-01 | Maatuk; Josef | Microprocessor-based liquid sensor and ice detector |
| CN1973190A (en) * | 2004-06-21 | 2007-05-30 | 西门子磁体技术有限公司 | Method for measuring liquid cryogen level using a level probe |
| JP2007139441A (en) * | 2005-11-15 | 2007-06-07 | Kobe Univ | Sensor and liquid level meter for measuring liquid level of ultra cold liquefied gas |
| JP2008532022A (en) * | 2005-03-05 | 2008-08-14 | テヒニッシェ・ウニヴェルジテート・ドレスデン | Superconducting liquid level measuring device for liquefied hydrogen and liquefied neon and measuring method for measuring liquid level |
| CN101438137A (en) * | 2006-03-06 | 2009-05-20 | 马格纳斯泰尔汽车技术两合公司 | Level sensor for cryogenic liquids, and receptacle comprising such a level sensor |
| JP2009186321A (en) * | 2008-02-06 | 2009-08-20 | Hitachi Ltd | Level gage, low-temperature thermostat equipped with level gage, and superconducting magnet equipped with level gage |
-
2011
- 2011-04-15 CN CN2011100955381A patent/CN102740512A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1989002583A1 (en) * | 1987-09-07 | 1989-03-23 | Institut Für Physik Der Universität Basel | Level indicator for cryogenic fluids |
| JPH01237419A (en) * | 1988-03-17 | 1989-09-21 | Nkk Corp | Method and apparatus for measuring liquid level |
| US5908985A (en) * | 1995-03-31 | 1999-06-01 | Maatuk; Josef | Microprocessor-based liquid sensor and ice detector |
| CN1973190A (en) * | 2004-06-21 | 2007-05-30 | 西门子磁体技术有限公司 | Method for measuring liquid cryogen level using a level probe |
| JP2008532022A (en) * | 2005-03-05 | 2008-08-14 | テヒニッシェ・ウニヴェルジテート・ドレスデン | Superconducting liquid level measuring device for liquefied hydrogen and liquefied neon and measuring method for measuring liquid level |
| JP2007139441A (en) * | 2005-11-15 | 2007-06-07 | Kobe Univ | Sensor and liquid level meter for measuring liquid level of ultra cold liquefied gas |
| CN101438137A (en) * | 2006-03-06 | 2009-05-20 | 马格纳斯泰尔汽车技术两合公司 | Level sensor for cryogenic liquids, and receptacle comprising such a level sensor |
| JP2009186321A (en) * | 2008-02-06 | 2009-08-20 | Hitachi Ltd | Level gage, low-temperature thermostat equipped with level gage, and superconducting magnet equipped with level gage |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103090925A (en) * | 2013-01-24 | 2013-05-08 | 中国科学院电工研究所 | Liquid nitrogen liquid level indicator |
| CN105387912A (en) * | 2015-12-11 | 2016-03-09 | 东莞市天倬电器有限公司 | Water level detection system |
| CN105387912B (en) * | 2015-12-11 | 2019-02-22 | 东莞市天倬电器有限公司 | Water level detecting system |
| CN106017615A (en) * | 2016-07-20 | 2016-10-12 | 哈尔滨今星微电子科技有限公司 | Absolute level meter |
| CN110132371A (en) * | 2019-04-23 | 2019-08-16 | 天津大学 | A kind of superconduction liquidometer for cryogenic cooling liquid liquid level monitoring |
| CN110132371B (en) * | 2019-04-23 | 2020-10-30 | 天津大学 | Superconducting liquid level meter for monitoring liquid level of cryogenic liquid |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR101949325B1 (en) | An absolute liquid level measuring equipment with anti-freezing function | |
| CN102740512A (en) | Heating device and liquid level detection system for cryogenic liquid | |
| US7966878B2 (en) | Method for measuring liquid cryogen level using a level probe | |
| Strouse | Variable‐temperature accessory for use with a four‐circle x‐ray diffractometer | |
| CN105403584A (en) | Thermal ageing experiment apparatus for simulating different oil flow velocity and high and low temperature impact of transformer | |
| US9435679B2 (en) | Tethered float liquid level sensor | |
| JP2009222596A (en) | Apparatus for detecting position of liquid level and measuring liquid volume | |
| US6925873B2 (en) | Liquid helium level sensor for use in a cryogenic environment and method for assembling same | |
| US5018387A (en) | Cryogenic liquid level measuring apparatus | |
| JP2008175640A (en) | Refrigerant liquid level measuring device, refrigerant liquid level measuring method, and superconductive magnet device using it | |
| EP0486604B1 (en) | Leakage detection system | |
| CN110879091A (en) | Liquid level meter for liquid helium, calibration method thereof and liquid helium container | |
| US4796471A (en) | Techniques useful in determining liquid levels | |
| CN207502031U (en) | A kind of reference test bar for the calibration of superconducting line liquid level gauge | |
| CN204287093U (en) | Stretch based on super magnetic hysteresis the solid interface thermal contact resistance proving installation of intellectual material | |
| US3111846A (en) | Temperature measurement of stored fluids | |
| KR101797621B1 (en) | Roll-over effect protection apparatus and method for floating offshore structure | |
| US2746293A (en) | Apparatus for determination of average temperature of fluids in storage | |
| Kajikawa et al. | Proposal of a new type of superconducting level sensor for liquidhydrogen with MgB2 wires | |
| US20200333174A1 (en) | Liquid Level Sensor | |
| CN107843317A (en) | A kind of reference test bar and its scaling method for the demarcation of superconducting line liquid level gauge | |
| JPS6133367B2 (en) | ||
| CN113670777A (en) | Imbibition experimental method | |
| CN203534668U (en) | Point mode temperature liquid level meter for low-temperature media | |
| JP2001074200A (en) | Liquid amount sensing device for super low temperature liquefied gas vessel |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20121017 |