CN1123748C - Low-loss low-temp enclosure with liquefied nitrogen - Google Patents
Low-loss low-temp enclosure with liquefied nitrogen Download PDFInfo
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- CN1123748C CN1123748C CN 00127813 CN00127813A CN1123748C CN 1123748 C CN1123748 C CN 1123748C CN 00127813 CN00127813 CN 00127813 CN 00127813 A CN00127813 A CN 00127813A CN 1123748 C CN1123748 C CN 1123748C
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Abstract
The present invention is composed of a liquid nitrogen storage tank, a heat transferring cavity with adjustable distance, a specimen cavity, glass fiber reinforced plastic screws for adjusting distance, a high vacuum multilayer insulating material, a glass fiber reinforced plastic support, a liquid level meter, a temperature measurer, etc. A temperature in the specimen cavity is changed by the adjustment of heat transferring distance, namely distance between the lower surface of the specimen cavity and the liquid nitrogen storage tank, of the heat transferring cavity; additionally, low temperature nitrogen in the liquid nitrogen storage tank is sprayed into the specimen cavity or completely exhausted accordingly to a rate of temperature reduction and temperature distribution in the specimen cavity. The present invention has the characteristics that a temperature in the specimen cavity can be adjusted between 150 DEG C below zero and 190 DEG C, and the temperature control effects are good; the high vacuum multilayer insulating material is filled in a low temperature tank, and the consumption of liquid nitrogen is low.
Description
The present invention relates to be a kind of temperature at-150 ℃--190 ℃ of low-loss low-temp enclosure with liquefied nitrogen that scope is adjustable.Be particularly suitable for aspects such as biological medicine, electronics, engineering material.This low-loss low-temp enclosure with liquefied nitrogen belongs to the cryogenic engineering technical field.
In existing technology, realize-150 ℃--190 ℃ temperature range, the easiest, the most economic method are to utilize the low temperature and the latent heat of vaporization of normal pressure liquid nitrogen.For example: by small type stepping motor, regulate sample position in the low temperature nitrogen space above liquid nitrogen container, make sample meet the requirements of low temperature.This method is regulated more flexible, and its shortcoming is that liquid nitrogen container opens wide, and the consumption liquid measure is bigger, and the sample quality that can bear is little, can not realize for a long time the preservation of samples and experiment etc. in a large number.In addition, can regulate the amount of liquid nitrogen that spraying in the sample cavity by the value of feedback of cavity temperature measurement.This method can realize the fast cooling in the chamber, but that subject matter is the low-temperature solenoid valve price of control liquid nitrogen spray is more expensive, and malfunctioning easily in using; Temperature survey lags behind more serious; By spraying this pulse action, in a period of time, keep comparatively difficulty of a certain steady temperature interval; The liquid nitrogen consumption is big etc.Along with improving constantly of medical science and scientific and technological level, the temperature regulating range and the thermostatic control required precision of cryostat are also more increased.Said method is difficult to satisfy requirements such as sample size is big, temperature stability good, the constant time is long.The patent No. is that 97221547.6 utility model patent " the liquid nitrogen gas is bathed low-temperature treatment plant " is to utilize the cryogenic nitrogen gas bath cool metal part that liquid nitrogen vaporization goes out in the K cryogenic treatment case.This treating apparatus, temperature can reach near-196 ℃.Major defect is that the temperature in the treatment box can not be regulated, and adopts the conventional insulation material layer, and liquid nitrogen loss is bigger.
The objective of the invention is deficiency and defective, and a kind of energy of exploitation satisfies the multipurpose low-loss low-temp enclosure with liquefied nitrogen that biology, medical science, electronic instrument test and testing of materials require in order to overcome above-mentioned prior art.The present invention utilizes heat transfer theory, by regulating the heat transfer chamber spacing, regulates the sample cavity temperature, and reduces liquid nitrogen loss by the high vacuum multiple layer heat insulation material, stablizes the sample cavity temperature.
Technical scheme of the present invention is: but low-loss low-temp enclosure with liquefied nitrogen mainly comprises compositions such as liquid nitrogen storage roll adjustment heat transfer chamber, sample cavity, fiberglass adjusting screw, three-way change-over valve door, high vacuum multiple layer heat insulation material, liquid level gauge, fiberglass supporting, adjusting screw, temperature survey Displaying Meter, low temperature nitrogen evacuated tube, low temperature nitrogen playpipe, compressible bellows, wheel, feed tube, temperature thermocouple, bellows, roll adjustment knob.Wherein, but cryogenic box shell, sample cavity roll adjustment heat transfer chamber are all made cylindrical.Sample cavity is placed in the cryogenic box shell.But the roll adjustment heat transfer chamber is installed below the sample cavity, but the upper and lower surface of roll adjustment heat transfer chamber adopts the copper material of good heat conductivity to make, wall adopts compressible bellows, fill helium in the heat transfer chamber, temperature thermocouple is installed in the sample cavity, and temperature thermocouple joins with the temperature survey Displaying Meter that is installed on the cryogenic box shell.Have steam vent at the sample cavity loam cake.Bellows is installed on sample cavity top, but the roll adjustment screw rod is housed in the bellows, but debugs apart from knob on the roll adjustment screw rod.But in the bottom of sample cavity and roll adjustment heat transfer chamber with liquid nitrogen storage is set on every side.Liquid level gauge is housed in the liquid nitrogen storage, in the bottom of liquid nitrogen storage the fiberglass supporting is installed, the fiberglass supporting is installed on the cryogenic box housing bottom inner surface.At cryogenic box outer casing bottom outer surface wheel is housed.Insert feed tube in the cryogenic box shell upper.Feed tube communicates with liquid nitrogen storage.Low temperature nitrogen evacuated tube and low temperature nitrogen playpipe also are installed on liquid nitrogen storage top.One end of low temperature nitrogen evacuated tube and low temperature nitrogen playpipe joins by the three-way change-over valve door.The low temperature nitrogen playpipe other end communicates with sample cavity.Filling high vacuum multiple layer heat insulation material in the cryogenic box shell inner surface is had living space to the institute between the sample cavity outer surface.
This cryogenic box by feed tube in liquid nitrogen storage towards fluid injection nitrogen, by the liquid level in the liquid level gauge observation storage tank.Can regulate distance between the heat transfer chamber upper and lower surface by the fiberglass adjusting screw, can change the thickness of gas blanket in the heat transfer chamber, thereby change heat output, the temperature of regulating the heat transfer chamber upper surface.Because the heat transfer chamber upper surface is the lower surface of sample cavity, the temperature that can regulate sample cavity by said method.Low temperature nitrogen in the liquid nitrogen storage is by low temperature nitrogen evacuated tube, low temperature nitrogen playpipe and three-way change-over valve door, and rate of temperature fall and Temperature Distribution need spray into low temperature nitrogen sample cavity or emptying in the chamber per sample.When low temperature nitrogen sprays in sample cavity, can shorten the temperature fall time of initial temperature-fall period in the sample cavity greatly, and help the homogenising in temperature field in the sample cavity.Temperature thermocouple in the sample cavity and temperature survey Displaying Meter can realize that the temperature in the sample cavity monitors in real time.All adopt the high vacuum multiple layer heat insulation material in this cryogenic box, liquid nitrogen storage, feed tube, low temperature nitrogen evacuated tube, low temperature nitrogen playpipe and three-way change-over valve door etc. all are embedded in the high vacuum multiple layer heat insulation material, greatly reduce liquid nitrogen loss, and help the stable of sample cavity temperature.The fiberglass supporting of liquid nitrogen storage bottom has also increased heat transfer distances, has reduced loss of refrigeration capacity.Therefore, except regulating the sample cavity temperature by heat transfer chamber, another main feature of the present invention is the thermal insulation design.
Beneficial effect: the present invention realizes that the temperature in the sample cavity reduces fast, and reaches-150 ℃ by specific device--190 ℃ temperature range.Simultaneously can be as requested, regulate in the sample cavity temperature and in certain temperature range the long period keep constant.The liquid nitrogen consumption of this cryogenic box is extremely low, easy to adjust, temperature control effect is good.Have wide practical use in preservation, instrument and the electronic device test of bio-pharmaceuticals, animals and plants species conservation, important tissue or organ, the fields such as cryogenic property test of engineering material.
Below in conjunction with accompanying drawing the present invention is further described:
Fig. 1 is the structure principle chart of low-loss low-temp enclosure with liquefied nitrogen.
As shown in Figure 1, the concrete enforcement of this invention is: low-loss low-temp enclosure with liquefied nitrogen comprises adjusting screw 1, temperature survey Displaying Meter 2, low temperature nitrogen evacuated tube 3, low temperature nitrogen playpipe 4, three-way change-over valve door 5, sample cavity 6, compressible bellows 7, cryogenic box shell 8, liquid nitrogen storage 9, but roll adjustment heat transfer chamber 10, fiberglass supporting 11, wheel 12, high vacuum multiple layer heat insulation material 13, feed tube 14, temperature thermocouple 15, bellows 16, roll adjustment knob 17, liquid level gauge 18 compositions such as grade.Wherein, but cryogenic box shell 8, sample cavity 6 roll adjustment heat transfer chamber 10 are all made cylindrical.
Sample cavity 6 is placed in centre in the cryogenic box shell 8.But roll adjustment heat transfer chamber 10 is installed below the sample cavity 6, but the upper and lower surface of roll adjustment heat transfer chamber 10 adopts the copper material of good heat conductivity to make, wall adopts compressible bellows 7.Temperature thermocouple 15 is installed in the sample cavity 6, and temperature thermocouple 15 joins with the temperature survey Displaying Meter 2 that is installed on the cryogenic box shell 8.Have steam vent 19 at sample cavity 6 loam cakes.Bellows 16 is installed above the sample cavity 6, but roll adjustment screw rod 1 is housed in the bellows 16, but debug apart from knob 17 on the roll adjustment screw rod 1.But in the bottom of sample cavity 6 and roll adjustment heat transfer chamber 10 with liquid nitrogen storage 9 is set on every side.Liquid level gauge 18 is housed in the liquid nitrogen storage 9, in the bottom of liquid nitrogen storage 9 fiberglass supporting 11 is installed, fiberglass supporting 11 is bearing on cryogenic box shell 8 bottom interior surfaces.At cryogenic box shell 8 bottom outer surfaces wheel 12 is housed.Insert feed tube 14 on cryogenic box shell 8 tops.Feed tube 14 communicates with liquid nitrogen storage 9.Low temperature nitrogen evacuated tube 3 and low temperature nitrogen playpipe 4 are installed on liquid nitrogen storage 9 tops.One end of low temperature nitrogen evacuated tube 3 and low temperature nitrogen playpipe 4 joins by three-way change-over valve door 5.The other end of low temperature nitrogen playpipe 4 communicates with sample cavity 6.In having living space, the institute between sample cavity 6 outer surfaces fills high vacuum multiple layer heat insulation material 13 at cryogenic box shell 8 inner surfaces.
This cryogenic box by feed tube 14 to liquid nitrogen storage 9 in towards fluid injection nitrogen, by the interior liquid level of liquid level gauge 18 observation liquid nitrogen storages 9.Can regulate distance between heat transfer chamber 10 upper and lower surfaces by roll adjustment knob 17 and fiberglass adjusting screw 1, can change the thickness of gas blankets in the heat transfer chamber 10, thereby change heat output, the temperature of regulating heat transfer chamber 10 upper surfaces.Because heat transfer chamber 10 upper surfaces are the lower surface of sample cavity 6, the temperature that can regulate sample cavity 6 by said method.Low temperature nitrogen in the liquid nitrogen storage 9 is by low temperature nitrogen evacuated tube 3, low temperature nitrogen playpipe 4 and three-way change-over valve door 5, and rate of temperature fall and Temperature Distribution need spray into low temperature nitrogen sample cavity 6 or emptying in the chamber 6 per sample.When low temperature nitrogen sprays in sample cavity 6, can shorten the temperature fall time of initial temperature-fall period in the sample cavity 6 greatly, and help the homogenising in temperature field in the sample cavity 6.Temperature thermocouple 15 in the sample cavity 6 and temperature survey Displaying Meter 2 can realize that the temperature in the sample cavity 6 monitor in real time.Liquid nitrogen storage 9, feed tube 14, low temperature nitrogen evacuated tube 3, low temperature nitrogen playpipe 4 and three-way change-over valve door 5 etc. all are embedded in the high vacuum multiple layer heat insulation material 13, greatly reduce liquid nitrogen loss, and help the stable of sample cavity 6 interior temperature.The fiberglass supporting 11 of liquid nitrogen storage 9 bottoms has also increased heat transfer distances, has reduced loss of refrigeration capacity.Therefore, except regulating sample cavity 6 temperature by heat transfer chamber 10, another main feature of the present invention is the thermal insulation design.
Claims (2)
1. a low-loss low-temp enclosure with liquefied nitrogen mainly comprises sample cavity (6), cryogenic box shell (8), liquid nitrogen storage (9), heat insulation layer (13), feed tube (14), liquid level gauge (18), temperature thermocouple (15), temperature survey Displaying Meter (2), wheel compositions such as (12), it is characterized in that also comprising bellows (16), roll adjustment knob (17), adjusting screw (1), low temperature nitrogen evacuated tube (3), low temperature nitrogen playpipe (4), three-way change-over valve door (5), compressible bellows (7), but roll adjustment heat transfer chamber (10), fiberglass supporting (11) etc., wherein, cryogenic box shell (8), sample cavity (6), but roll adjustment heat transfer chamber (10) is all made cylindrical, sample cavity (6) is placed in the interior centre of cryogenic box shell (8), sample cavity (6) but below roll adjustment heat transfer chamber (10) is installed, temperature thermocouple (15) is installed in the sample cavity (6), temperature thermocouple (15) joins with the temperature survey Displaying Meter (2) that is installed on the cryogenic box shell (8), have steam vent (19) at sample cavity (6) loam cake, bellows (16) is installed above the sample cavity (6), bellows (16) but in roll adjustment screw rod (1) is housed, but debug on the roll adjustment screw rod (1) apart from knob (17), can regulate distance between heat transfer chamber (10) upper and lower surface by roll adjustment knob (17) and fiberglass adjusting screw (1), can change the thickness of the interior gas blanket of heat transfer chamber (10), thereby change heat output, regulate the temperature of heat transfer chamber (10) upper surface, at sample cavity (6) but and the bottom of roll adjustment heat transfer chamber (10) and liquid nitrogen storage (9) is set on every side, liquid level gauge (18) is housed in the liquid nitrogen storage (9), fiberglass supporting (11) is installed in bottom at liquid nitrogen storage (9), fiberglass supporting (11) is installed on cryogenic box shell (8) bottom interior surface, on cryogenic box shell (8) bottom outer surface, wheel (12) is housed, low temperature nitrogen evacuated tube (3) and low temperature nitrogen playpipe (4) are installed on cryogenic box shell (9) top, one end of low temperature nitrogen evacuated tube (3) and low temperature nitrogen playpipe (4) joins by three-way change-over valve door (5), and low temperature nitrogen playpipe (4) other end communicates with sample cavity (6).
2. by the described a kind of low-loss low-temp enclosure with liquefied nitrogen of claim 1, its feature also be by liquid nitrogen feed tube (14) in liquid nitrogen storage (9) towards fluid injection nitrogen, but in roll adjustment heat transfer chamber (10), dash the helium of annotating certain pressure, but roll adjustment heat transfer chamber (10) upper and lower surface all adopts copper material, wall adopts compressible bellows (7), fill high vacuum multiple layer heat insulation material (13) at cryogenic box shell (8) inner surface in the institute between the sample cavity outer surface has living space, adjusting screw (1) is made with fiberglass.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00127813 CN1123748C (en) | 2000-12-07 | 2000-12-07 | Low-loss low-temp enclosure with liquefied nitrogen |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00127813 CN1123748C (en) | 2000-12-07 | 2000-12-07 | Low-loss low-temp enclosure with liquefied nitrogen |
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| Publication Number | Publication Date |
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| CN1305083A CN1305083A (en) | 2001-07-25 |
| CN1123748C true CN1123748C (en) | 2003-10-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 00127813 Expired - Fee Related CN1123748C (en) | 2000-12-07 | 2000-12-07 | Low-loss low-temp enclosure with liquefied nitrogen |
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Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100633223B1 (en) * | 2005-09-30 | 2006-10-11 | 엘에스전선 주식회사 | Cryogenic refrigerators having dividing means |
| CN101469930B (en) * | 2007-12-28 | 2011-12-07 | 中国航天科技集团公司第五研究院第五一〇研究所 | Composite temperature-variable refrigeration temperature coupling mechanism of liquid nitrogen refrigerating apparatus |
| CN101852703B (en) * | 2010-05-26 | 2013-04-10 | 北京航空航天大学 | Ultra-low temperature constant temperature grabbing bar device |
| CN102818731B (en) * | 2011-06-10 | 2014-08-06 | 中国石油天然气集团公司 | Low temperature test system of low temperature stretching tests |
| CN102616472B (en) * | 2012-03-07 | 2013-12-18 | 上海交通大学 | Integrated device for fumigating, freezing, storing and transporting gametes based on liquid nitrogen |
| CN103884602A (en) * | 2012-12-20 | 2014-06-25 | 核工业西南物理研究院 | Low-temperature stretching testing system and testing method |
| CN106829202B (en) * | 2017-01-13 | 2019-05-31 | 北京华晨世纪生物技术有限公司 | Constant low temperature storage system and the method for removing Dewar fog |
| CN107975993B (en) * | 2017-11-14 | 2020-10-27 | 中国科学院理化技术研究所 | Cold storage type storage tank at minus 40 ℃ to minus 190 DEG C |
| CN108645087A (en) * | 2018-05-17 | 2018-10-12 | 宜昌市汇宜兴新能源科技有限公司 | A kind of biological agent equipment |
| CN110132925A (en) * | 2019-06-03 | 2019-08-16 | 河海大学 | A kind of pumping-detection time-resolved fluorescence system sample environment temperature regulating device |
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2000
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