KR940003540Y1 - Rapid Cooling System Using Insulation Low Pressure Tank - Google Patents
Rapid Cooling System Using Insulation Low Pressure Tank Download PDFInfo
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- KR940003540Y1 KR940003540Y1 KR2019900021756U KR900021756U KR940003540Y1 KR 940003540 Y1 KR940003540 Y1 KR 940003540Y1 KR 2019900021756 U KR2019900021756 U KR 2019900021756U KR 900021756 U KR900021756 U KR 900021756U KR 940003540 Y1 KR940003540 Y1 KR 940003540Y1
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- liquid nitrogen
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- tank
- low pressure
- compressed air
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- 238000001816 cooling Methods 0.000 title claims description 22
- 238000009413 insulation Methods 0.000 title 1
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 162
- 239000007788 liquid Substances 0.000 claims description 81
- 229910052757 nitrogen Inorganic materials 0.000 claims description 81
- 238000002347 injection Methods 0.000 claims description 15
- 239000007924 injection Substances 0.000 claims description 15
- 239000000110 cooling liquid Substances 0.000 claims description 10
- 238000002474 experimental method Methods 0.000 claims description 9
- 238000007599 discharging Methods 0.000 claims description 2
- 238000005507 spraying Methods 0.000 claims description 2
- 238000013019 agitation Methods 0.000 claims 1
- 238000012360 testing method Methods 0.000 description 12
- 239000002826 coolant Substances 0.000 description 9
- 238000007710 freezing Methods 0.000 description 4
- 230000008014 freezing Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000003756 stirring Methods 0.000 description 3
- 238000009423 ventilation Methods 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 230000005587 bubbling Effects 0.000 description 2
- 238000012937 correction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- QWTDNUCVQCZILF-UHFFFAOYSA-N isopentane Chemical compound CCC(C)C QWTDNUCVQCZILF-UHFFFAOYSA-N 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000001273 butane Substances 0.000 description 1
- BDJOPCBWIOGONH-UHFFFAOYSA-N butane;2-methylbutane Chemical compound CCCC.CCC(C)C BDJOPCBWIOGONH-UHFFFAOYSA-N 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- AFABGHUZZDYHJO-UHFFFAOYSA-N dimethyl butane Natural products CCCC(C)C AFABGHUZZDYHJO-UHFFFAOYSA-N 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- IJDNQMDRQITEOD-UHFFFAOYSA-N n-butane Chemical compound CCCC IJDNQMDRQITEOD-UHFFFAOYSA-N 0.000 description 1
- OFBQJSOFQDEBGM-UHFFFAOYSA-N n-pentane Natural products CCCCC OFBQJSOFQDEBGM-UHFFFAOYSA-N 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 239000003507 refrigerant Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000006200 vaporizer Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/60—Investigating resistance of materials, e.g. refractory materials, to rapid heat changes
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/022—Environment of the test
- G01N2203/0222—Temperature
- G01N2203/0228—Low temperature; Cooling means
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- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
Abstract
내용 없음.No content.
Description
제1도는 본 고안에 의한 급속냉각장치의 계통도.1 is a system diagram of a rapid cooling apparatus according to the present invention.
제2도는 본 고안에 의한 급속냉각장치에 사용되는 저압조의 단면도.2 is a cross-sectional view of a low pressure vessel used in the rapid cooling apparatus according to the present invention.
제3도는 본 고안에 의한 급속냉각장치에 사용되는 극저온 시험도의 일부절개사시도.3 is a partial cutaway perspective view of the cryogenic test diagram used in the rapid cooling apparatus according to the present invention.
* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings
1,1' : 액체질소탱크 10 : 단열저압조1,1 ': liquid nitrogen tank 10: adiabatic low pressure tank
11 : 다공노즐 15 : 극저온 실험조11: porous nozzle 15: cryogenic experiment tank
16 : 냉각액 17 : 시편16: coolant 17: specimen
22 : 저압 액화질소 분사기 13 : 고압 액체질소 분사관22: low pressure liquid nitrogen injector 13: high pressure liquid nitrogen injector
29 : 저압 액체질소 노즐구 30 : 압축공기 저장탱크29: low pressure liquid nitrogen nozzle port 30: compressed air storage tank
31 : 시험편 파지구31: test piece holding
본 고안은 저온 파괴 시험용 급속냉각장치에 관한 것이며, 보다 상세히는 단열저압조를 이용한 급속냉각장치에 관한 것이다.The present invention relates to a rapid cooling apparatus for low temperature destruction test, and more particularly to a rapid cooling apparatus using an adiabatic low pressure tank.
시편의 저온파괴시험은 시편을 냉각시켜주는 냉각액의 급속한 냉각을 통해 임의의 실험온도에 신속히 도달시켜 시편을 파단케한다.The cold fracture test of the specimen breaks the specimen by rapidly reaching a certain experimental temperature through rapid cooling of the cooling liquid that cools the specimen.
일반적인 냉각액의 냉각방식은 냉각실험조에 상온의 냉각액을 채우고, 충전된 액체질소 탱크로부터 액체질소를 실험조 바닥에 포설된 분사노즐의 액체질소분사를 통해 냉각시키는 노즐냉각방식과, 액체질소 혹은 액체 이산화탄소 라인과 연결되어 공급되는 냉매를 기화기가 기화시킨 뒤 강제 통풍팬(FAN)의 회전으로 분위기 온도를 하강시 는 강제통풍 방식이 있다. 노즐냉각방식은 분사압력이 높아서 상온내지 -20℃이내에서는 냉각액의 버블링(Bubbling)이 발생되어 냉각능이 저하되며 극저온(-60℃ ∼-150℃)에 도달하는 시간이 길며, 또한 이 온도대에서의 냉각능 저하가 문제된다. 강재통풍방식은 기화된 냉각질소를 사용하기 때문에 도달온도의 한계가 있다.(-125℃까지).The general cooling method of the cooling liquid is a nozzle cooling method of filling a cooling experiment tank with a normal temperature, cooling liquid nitrogen from a filled liquid nitrogen tank through a liquid nitrogen injection of a spray nozzle installed at the bottom of the experiment tank, and liquid nitrogen or liquid carbon dioxide. There is a forced ventilation method in which the vaporizer vaporizes the refrigerant supplied in connection with the line and then drops the atmosphere temperature by the rotation of the forced ventilation fan (FAN). The nozzle cooling method has a high injection pressure, causing bubbling of the coolant within room temperature to -20 ° C, resulting in a decrease in cooling capacity and a long time to reach cryogenic temperatures (-60 ° C to -150 ° C). Deterioration in cooling capacity is a problem. The steel ventilation system uses vaporized cooling nitrogen, which limits the temperature reached (up to -125 ° C).
이에 본 고안의 목적은 상기와 같은 종래기술의 단점을 보완하여, 극저온 범위까지 신속히 급냉시킴과 동시에 극저온에서의 온도를 일정하게 유지 시킬 수 있는 급속냉각 장치를 제공하는데 있다.Accordingly, an object of the present invention is to compensate for the disadvantages of the prior art as described above, to provide a rapid cooling device capable of rapidly cooling to a cryogenic range and maintaining a constant temperature at a cryogenic temperature.
본 고안에 의한 급속냉각장치는, 액체질소탱크 ; 압축공기저장탱크 ; 상기 액체질소탱크 및 압축공기 저장탱크와 각각 연결되며, 상기 액체질소탱크로부터의 액체질소를 방출하는 액체질소방출구, 상기 압축공기 저장탱크와 연결되어 압축공기를 분사시키는 다공노즐, 저압으로 조절된 공기 솔레노이드 밸브와 연결되어 일정압의 공기를 유입하게 하는 압력계, 내부의 전체압력이 일정압이상이되면 열려서 저압조의 내압을 일정하게 유지시키는 안전밸브, 및 액체유출구로 이루어지며, 상기 솔레노이드 밸브, 다공질노즐, 압력계 및 안전밸브의 작용에 의해 내압이 일정하게 유지되어 그 압력으로 저압의 액직을 유출시키게 되어 있는 단열밀폐 저압조 ; 상기 단열밀폐 저압조의 액체질소 유출된 저압의 액체질소를 유입분사하는 액체질소분사기, 후술하는 고압충전 액체질소 탱크로부터의 액체질소를 고압분사하는 고압책체질소 분사구가 달린 고압액체질소분사관, 온도계 시편파지구를 포함하여 이루어지며 내부에 냉각액이 충전된 극저온 실험조 ; 및 상기 고압액체질소 분사관과 연결된 고압충전 액체질소 탱크:로 이루어진다.Rapid cooling apparatus according to the present invention, the liquid nitrogen tank; Compressed air storage tank; Connected to the liquid nitrogen tank and the compressed air storage tank, respectively, a liquid nitrogen outlet for discharging liquid nitrogen from the liquid nitrogen tank, a porous nozzle connected to the compressed air storage tank and spraying compressed air, and controlled at a low pressure The pressure gauge is connected to the air solenoid valve to induce air of a constant pressure, and when the entire pressure inside the pressure exceeds a certain pressure, the pressure relief valve is opened and maintains the internal pressure of the low pressure tank, and the liquid outlet port comprises the solenoid valve and the porous nozzle. Heat-insulated low pressure tank which maintains constant internal pressure by the action of pressure gauge and safety valve, and discharges low pressure liquid at the pressure; Liquid nitrogen injector for injecting and injecting low-pressure liquid nitrogen into the liquid nitrogen of the adiabatic sealed low pressure tank, a high pressure liquid nitrogen injection tube having a high pressure shield nitrogen injection port for high-pressure injection of liquid nitrogen from a high-pressure-filled liquid nitrogen tank described below. Cryogenic experiment tank including gripping and filled with coolant inside; And a high pressure charged liquid nitrogen tank connected to the high pressure liquid nitrogen injection tube.
이하 본 고안의 일실시예를 첨도면을 참조하여 설명한다.Hereinafter, an embodiment of the present invention will be described with reference to kurtosis.
제1도는 본 고안에 의한 급속냉각장치의 계통도로써, 이에의하면 본 고안의 급속냉각장치는 ; 액체질소탱크(1) ; 압축공기저장탱크(30) ; 액체질소탱크(1) 및 압축공기 저장탱크(30)과 각각 연결되고 방출밸브(21)을 갖는 단열밀폐저압조(10) ; 단열밀폐저압조(10)와 연결된 극저온 실험조 ; 및 고압충전액체질소탱크(1') ; 이루어져 있으며, 상기 단열밀폐저압조(10)의 방출부와 상기 고압충전액체질소탱크(1')의 방출부는 밸브(28)을 통해 연결되어있다.1 is a system diagram of a rapid cooling device according to the present invention, whereby the rapid cooling device of the present invention; Liquid nitrogen tank 1; Compressed air storage tank (30); An adiabatic sealed low pressure tank 10 connected to the liquid nitrogen tank 1 and the compressed air storage tank 30 and having a discharge valve 21; Cryogenic experimental tank connected to the adiabatic sealed low pressure tank (10); And high pressure filling liquid nitrogen tank 1 '; It consists of, the discharge portion of the adiabatic sealed low pressure tank 10 and the discharge portion of the high-pressure filling liquid nitrogen tank (1 ') is connected through a valve (28).
상기 단열밀폐 저압조(10)는 제 2도에 자세히 도시되어 있는 바와같이, 호리병모양의 길고 좁은 주둥이가 형성되어 보냉효과를 높이게 되어 있으며, 그 상단에 밀폐를 위해 패킹재(9) 및 단열재뚜껑(9')가 설치되어 있고 이들은 체결용너크(8)로써 체결 및 해체가 가능하게 되어있다.As shown in detail in FIG. 2, the thermally sealed low pressure tank 10 is formed of a long bottle-shaped spout which is shaped like a bottle to increase the cooling effect, and a packing material 9 and an insulating material lid for sealing at the top thereof. 9 'are provided, and these can be fastened and disassembled by the fastening knuckle 8.
6은 압축공기 저장탱크(30)과 연결되는 연결관으로써 유연한 재질로 되어 있다.6 is a connecting pipe connected to the compressed air storage tank 30 is made of a flexible material.
연결관의 끝에는 다공노즐(11)이 설치되어 압축공기 저장탱크(30)으로부터 필터(2), 밸브(3)를 거쳐유입된 압축공기가 단열밀폐저압조(10)내부로 균압유입되게 한다.At the end of the connecting pipe, a porous nozzle 11 is installed to allow the compressed air introduced from the compressed air storage tank 30 to pass through the filter 2 and the valve 3 into the adiabatic sealed low pressure tank 10.
압력계(9)은 압축공기유입관에 연결된 공기 솔레노이드 밸브(5)와 연계되어 저압(본 실시예에서는 1.0-1.5㎏/㎠)로 조절된 일정압의 공기를 보내주게 한다.The pressure gauge 9 is connected to the air solenoid valve 5 connected to the compressed air inlet pipe so as to send a constant pressure air adjusted to low pressure (1.0-1.5 kg / cm 2 in this embodiment).
안전밸브(12)는 저압조내의 전체압력이 일정압(본실시예에서는 2㎏/㎠) 이상이 되면 열려서 저압조의 내압을 일정하게 유지시킨다.The safety valve 12 is opened when the total pressure in the low pressure tank is equal to or higher than a constant pressure (2 kg / cm 2 in this embodiment) to keep the internal pressure of the low pressure tank constant.
상기 공기 솔레노이드밸브(5), 다공질 노즐(11), 압력계(7) 및 안전밸브(12)는 일정공기압 공급장치를 이루어 단열밀폐저압조(10)내의 압력을 일정하게 유지하게 된다.The air solenoid valve 5, the porous nozzle 11, the pressure gauge 7 and the safety valve 12 form a constant air pressure supply device to maintain a constant pressure in the adiabatic sealed low pressure vessel 10.
단열밀폐저압조(10)으로부터 유출된 저압액체질소는 제 3도에 상세히 도시된 극저온 실험조(15)로 유입하게 된다.The low pressure liquid nitrogen flowing out of the adiabatic sealed low pressure tank 10 is introduced into the cryogenic experiment tank 15 shown in detail in FIG.
극저온 실험조(15)내부에는 시험편(17)을 파지하는 시험편 파지구(31)가 축고정되어 있으며, 그 하부에는 단열밀폐저압조(10)에서 유출되는 액체질소를 극저온 실험조 내부로 서서히 유입되는 저압액체질소 분사기(22)가 설치되어 있다.Inside the cryogenic test tank 15, a test piece holding hole 31 for holding the test piece 17 is axially fixed, and a liquid nitrogen flowing out of the adiabatic sealed low pressure tank 10 is gradually introduced into the cryogenic test tank. A low pressure liquid nitrogen injector 22 is provided.
한편 저압액체질소 분사기 하부에는, 고압충전액체질소 탱크(1')와 밸브(24)(25)를 지나 유입되는 고압의 액체질소를 분사시키는 고압액화질소분사구(29)가 형성된 고압액체질소분사관(23)이 원형으로 장착되어 있어, 저압액체질소 분사기(22)주위에 결빙된 냉각액을 해빙시키게 된다.On the other hand, the high pressure liquid nitrogen injection pipe formed with a high pressure liquid nitrogen injection port 29 for injecting high pressure liquid nitrogen flowing through the high pressure filling liquid nitrogen tank 1 'and the valves 24 and 25 under the low pressure liquid nitrogen injector ( 23) is mounted in a circular shape to thaw the cooling liquid frozen around the low pressure liquid nitrogen injector 22.
극저온 실험조(15)내부는 주성분이 액화부탄(2-methyl buthane)인 냉각액(16)으로 충전되어 있으며 이는 급격이 기화되는 대신 극저온에서 결빙되지 않는 성질을 갖는다.The cryogenic experimental tank 15 is filled with a cooling liquid 16 whose main component is liquefied butane (2-methyl buthane), which has a property of not freezing at cryogenic temperature instead of rapidly evaporating.
한편 본실시예에서는 제 2도에 도시된 바와같이 고압충전액체질소탱크(1')의 유출관과 단열밀폐저압조(10)의 유출관은 밸브(28)을 통해 연결되어 있다.Meanwhile, in the present embodiment, as shown in FIG. 2, the outlet pipe of the high-pressure filling liquid nitrogen tank 1 ′ and the outlet pipe of the adiabatic sealed low pressure tank 10 are connected through a valve 28.
상기와같이 구성된 본 고안의 장치는 실험시, 시편(17)을 극저온 실험조(15)의 냉각액(16)에 잠지게 한 후, 단열밀폐저압조(10의 뚜껑(9')을 열고 고압(14㎏/㎠)으로 충전된 액체질소탱크(1)의 방출밸브를 열면 밸브(20) 및 액체질소 방출구(31)을 통해 고압의 액체질소가 단열 및 폐저압조(10)내로 방출됨과 동시에 다량의 고압기화 질소가 발생, 대기로 뿜어지면서 액체질소가 고이게되며 액 수위계(13)가 만수위를 가르키면 밸브(20)을 닫고 뚜껑(9')를 밀봉한다.In the apparatus of the present invention configured as described above, after the specimen 17 is immersed in the cooling liquid 16 of the cryogenic experiment tank 15, the high pressure ( When the discharge valve of the liquid nitrogen tank 1 filled with 14 kg / cm 2 is opened, the high pressure liquid nitrogen is released into the adiabatic and waste low pressure tank 10 through the valve 20 and the liquid nitrogen discharge port 31. A large amount of high-pressure vaporized nitrogen is generated, and the liquid nitrogen is accumulated as it is pumped into the atmosphere. When the liquid level gauge 13 points to the full water level, the valve 20 is closed and the lid 9 'is sealed.
압축공기 밸브(3)를 열면 필터(2)를 통과하며 수분, 유분이 제거된 공기가 다공노즐(11)을 통해 저압조로 균압유입된다. 이때 영하 -196℃의 액체질소표면과 상온의 공기가 접촉되어 급속히 기화된 질소가 발생되며, 저압(1.0-1.5㎏/㎠)으로 조절된 공기 솔레노이드 밸브(5)와 연결된 압력계(7)가 작동되어 일정압의 공기를 보내준다. 기화된 질소의 혼합된 공기는 일정한 압력을 갖게 된다.When the compressed air valve 3 is opened, the air passing through the filter 2 and the water and oil removed therefrom are uniformly introduced into the low pressure tank through the porous nozzle 11. At this time, the liquid nitrogen surface at minus -196 ℃ and the air at room temperature are rapidly contacted to generate the vaporized nitrogen, the pressure gauge (7) connected to the air solenoid valve (5) adjusted to low pressure (1.0-1.5㎏ / ㎠) is operated It sends air of constant pressure. The mixed air of vaporized nitrogen has a constant pressure.
안전밸브(12)는 저압조내의 전체압력이 일정압(2㎏/㎠)이상이되면 열려서 저압조내의 내압은 일정압을 유지하게 된다.The safety valve 12 is opened when the total pressure in the low pressure tank is equal to or higher than a constant pressure (2 kg / cm 2) so that the internal pressure in the low pressure tank maintains a constant pressure.
극저온 실험조(15)내의 냉각액(-이액은 급격히 기화되는 대신 극저온에서 결빙되지 않는 장점이 있어서 극저온 〔-80℃ ∼-190℃〕시험의 냉각액으로 사용되면 주성분이 액화부탄 〔-2Methyl Butane〕인 이소펜탄액은〔IsO-Pentane〕)은 온상태이므로 다량의 액체질소가 순식간에 유입되면 급격히 작용하여 폭발하듯 심한 버블링(Bubbling)을 일으키므로, 밸브(21)의 열림량을 조절하여, 저압으로 유지된 저압조의 액체질소를 저압액화질소 분사기(22)를 통해 실험조(15)내로 흘괴듯 유입시킨다.Cooling liquid in the cryogenic experiment tank 15 (-liquid has the advantage that it does not freeze at the cryogenic temperature instead of rapidly evaporating, so when used as a cooling liquid for cryogenic [-80 ℃ ~ -190 ℃] test, the main component is liquefied butane [-2Methyl Butane]). Isopentane liquid is [IsO-Pentane]) is on, so when a large amount of liquid nitrogen flows in a moment, it suddenly acts and causes severe bubbling. As a result, the opening amount of the valve 21 is controlled to control the low pressure. The liquid nitrogen of the low pressure tank maintained as is flowing into the test tank 15 through the low pressure liquid nitrogen injector 22.
이때 냉각액은 급속히 액화질소분사기(22) 주위에 결빙되므로 실험조 바닥에 원형으로 깔린 액체질소가 분사파이프(23)의 중심에 방사형으로 뚫린 고압액체질소 분사구(29)를 통해 15㎏/㎠의 고압으로 충전된 액체질소 탱크(1')의 액체질소를 밸브(24,25)를 통해 고압분사 시켜서, 냉각과동시에 강한 교반력으로 결빙부를 해빙시킨다.At this time, since the coolant rapidly freezes around the liquefied nitrogen injector 22, a high pressure of 15 kg / cm 2 through the high pressure liquid nitrogen injection port 29 in which the liquid nitrogen, which is circularly deposited on the bottom of the test tank, is radially drilled in the center of the injection pipe 23. The liquid nitrogen of the liquid nitrogen tank 1 'filled with high pressure is sprayed through the valves 24 and 25 to thaw the frozen portion with strong stirring force at the same time as cooling.
냉각액이 -50℃로 되면 결빙현상은 줄어들므로 이때는 액체질소의 유입량을 늘린다. 임의의 온도는 온도계(19)로 체크하고, 목표온도에 도달되면, 일정온도 유지를 위해 고. 저액체질소 노즐을 모두 낮게 조절하여 분사한다.When the coolant reaches -50 ° C, freezing is reduced, which increases the flow of liquid nitrogen. The arbitrary temperature is checked with a thermometer 19, and when the target temperature is reached, it is kept to maintain a constant temperature. Adjust all low liquid nitrogen nozzles to low
이때 고압충전액체질소 노즐구(29)를 통해 분사되는 액체질소는 교반용으로, 저압구(22)를 통해 서서히 흘러주는 액체질소는 온도보정용으로 작용하게 된다. 이때 밸브(28)은 닫힌 상태이다. 실험조(15)내의 온도가 과냉되었을때는 밸브(21)을 닫아 액체질소의 유입을 차단하고, 밸브(24)만을 열어, 교반을 통해 온도교정을 한다. 이때 분사가 정지된 저압액체질소 분사구(22) 내부에는 냉각액이 스며들어 파이프내에 잔류된 액질로인해 부분적인 결빙이 될 우려가 있으므로, 다시 액화질소를 유입시킬시에는 밸브(21)을 틀기전에 밸브(24,28)을 모두열어 고압으로 불어서 결빙부를 제거한후 밸브(21)을 열고 밸브(28)를 잠근다.At this time, the liquid nitrogen injected through the high-pressure filling liquid nitrogen nozzle port 29 is for stirring, and the liquid nitrogen flowing slowly through the low pressure port 22 serves as a temperature correction. At this time, the valve 28 is closed. When the temperature in the experiment tank 15 is overcooled, the valve 21 is closed to block the inflow of liquid nitrogen, only the valve 24 is opened, and the temperature is corrected by stirring. At this time, since the cooling liquid may penetrate into the low pressure liquid nitrogen injection port 22 in which the injection is stopped, there is a possibility of partial freezing due to the remaining liquid in the pipe. Therefore, when the liquid nitrogen is introduced again, the valve is turned off before turning on the valve 21. Open all of (24, 28) and blow it at high pressure to remove the freezing section, open the valve (21) and close the valve (28).
이상의 과정으로 임의의 온도에 급격히 도달되면 일정시간 경과후 파괴시험에 들어가며, 시편파단후 밸브(26)으로 냉각된 냉각액은 보온병(27)로 회수되며, 다음시편이 장착되면 밸브(29)을 닫고 회수된 냉각액은 다시 부어져서 재실험에 들어간다. 상기와 같은 과정을 거쳐서, 냉각액은 저압조의 액체질소 저압유입으로 인해 급속히 냉각되고, 온도계에서 읽히는 냉각액의 온도동정을 살피며 저압조의 액체질소 유입량을 조절함으로서 극저온에서의 온도보정효과를 기대할 수 있는 효과가 있다.In the above process, if a certain temperature is suddenly reached, the fracture test is started after a certain time. After the specimen is broken, the coolant cooled by the valve 26 is recovered into the thermos 27. When the next specimen is installed, the valve 29 is closed. The recovered coolant is poured again and retested. Through the above process, the coolant is cooled rapidly due to the low pressure inlet of liquid nitrogen in the low pressure tank, and by checking the temperature identification of the coolant read from the thermometer, and controlling the inflow of liquid nitrogen in the low pressure bath, the temperature correction effect can be expected at cryogenic temperatures. have.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101471184B1 (en) * | 2013-02-07 | 2014-12-11 | 한국기계연구원 | Method for reducing the ultralow temperature test and Device for reducing the cost of ultralow temperature test |
| KR20160025269A (en) * | 2014-08-27 | 2016-03-08 | 부산대학교 산학협력단 | Apparatus and Method for Measuring Thermal Insulation Performance of Pipe |
| KR101694731B1 (en) * | 2015-12-08 | 2017-01-11 | 주식회사 포스코 | Specimen heat treament apparatus |
| KR20190072975A (en) * | 2017-12-18 | 2019-06-26 | 주식회사 포스코 | Low Temperature Tester |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109682412B (en) * | 2019-01-16 | 2023-11-07 | 南京航空航天大学 | How to use the low-temperature spray cooling experimental device |
| CN110343658A (en) * | 2019-07-31 | 2019-10-18 | 西安鲲创科技发展有限公司 | A kind of medical cell experiment process liquid configuration method and products thereof |
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1990
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101471184B1 (en) * | 2013-02-07 | 2014-12-11 | 한국기계연구원 | Method for reducing the ultralow temperature test and Device for reducing the cost of ultralow temperature test |
| KR20160025269A (en) * | 2014-08-27 | 2016-03-08 | 부산대학교 산학협력단 | Apparatus and Method for Measuring Thermal Insulation Performance of Pipe |
| KR101694731B1 (en) * | 2015-12-08 | 2017-01-11 | 주식회사 포스코 | Specimen heat treament apparatus |
| KR20190072975A (en) * | 2017-12-18 | 2019-06-26 | 주식회사 포스코 | Low Temperature Tester |
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