KR100384492B1 - Pre-cooling device for cooling water of thermal vacuum chamber using Liquid Nitrogen - Google Patents
Pre-cooling device for cooling water of thermal vacuum chamber using Liquid Nitrogen Download PDFInfo
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- KR100384492B1 KR100384492B1 KR10-2001-0020529A KR20010020529A KR100384492B1 KR 100384492 B1 KR100384492 B1 KR 100384492B1 KR 20010020529 A KR20010020529 A KR 20010020529A KR 100384492 B1 KR100384492 B1 KR 100384492B1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/40—Fluid line arrangements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B9/00—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point
- F25B9/002—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point characterised by the refrigerant
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2600/00—Control issues
- F25B2600/25—Control of valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/21—Temperatures
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Abstract
본 발명은 지상에서 우주환경을 모사하는 장치로 인공위성의 우주 열환경 모사시험에 있어서 유입되는 냉각수의 온도를 조절하여 계절에 관계없이 열진공챔버를 사용할 수 있도록 하는 극저온 냉매를 이용한 열진공챔버용 냉각수 사전 냉각장치에 관한 것이다.The present invention is a device for simulating the space environment on the ground, the cooling water for the thermal vacuum chamber using a cryogenic refrigerant to control the temperature of the cooling water introduced in the space thermal environment simulation test of the satellite to use the thermal vacuum chamber regardless of the season It relates to a pre-cooling device.
종래에는 냉각탑을 이용한 순환방식의 경우 여름철에는 장비의 작동을 시키지 못하게 되거나, 순환시키지 않고 사용된 냉각수를 방류시키는 경우 막대한 수자원의 낭비가 초래되는 결점이 있었다.Conventionally, in the case of a circulation system using a cooling tower, there is a drawback in that the operation of the equipment is prevented in summer, or when the used cooling water is discharged without circulation, a huge waste of water resources is caused.
따라서 본 발명은 전자밸브(15)가 설치된 LN2 공급관(14)과 배기관(13)이 연결되어 극저온 냉매를 공급받는 내부용기(2)의 외측으로 방열판(3)이 설치되어 냉각수 입구(8)로 공급되는 냉각수가 방열판(3)과 열교환되어 냉각수 출구(6)로 배출되도록 하는 외부용기(1)로 구성되어 사전냉각이 가능하도록 하는 것이다.Therefore, in the present invention, the heat sink 3 is installed on the outside of the inner container 2 in which the LN2 supply pipe 14 having the solenoid valve 15 installed therein and the exhaust pipe 13 are supplied with the cryogenic refrigerant to the cooling water inlet 8. The cooling water supplied is composed of an external container 1 for exchanging heat with the heat sink 3 to be discharged to the cooling water outlet 6 to enable pre-cooling.
Description
본 발명은 지상에서 우주환경을 모사하는 장치로 인공위성의 우주 열환경 모사시험에 있어서 유입되는 냉각수의 온도를 조절하여 계절에 관계없이 열진공챔버를 사용할 수 있도록 하는 극저온 냉매를 이용한 열진공챔버용 냉각수 사전 냉각장치에 관한 것이다.The present invention is a device for simulating the space environment on the ground, the cooling water for the thermal vacuum chamber using a cryogenic refrigerant to control the temperature of the cooling water introduced in the space thermal environment simulation test of the satellite to use the thermal vacuum chamber regardless of the season It relates to a pre-cooling device.
열진공챔버는 지상에서 우주환경을 모사하는 장치로 인공위성의 우주 열환경 모사시험에 사용되는 고가의 장비이다.The thermal vacuum chamber is a device that simulates the space environment on the ground and is an expensive equipment used for the simulation of space thermal environment of satellites.
통상 진공환경을 만들고 슈라우드의 온도를 -196℃∼110℃까지 변화시키면서 열환경시험을 하게된다.Normally, a vacuum environment is created and the thermal environment test is performed while changing the temperature of the shroud from -196 ° C to 110 ° C.
그런데 이러한 열진공챔버 및 열주기챔버에 사용되는 저온펌프(Cryo-Pump), 진공펌프(Mechanical Pump)등에는 냉각수의 공급이 필수적이며, 요구되는 냉각수의 온도도 10℃∼20℃ 정도의 냉각수 입구온도를 요구하는 경우가 많다.However, the supply of cooling water is essential for the cryo-pump and the mechanical pump used in the thermal vacuum chamber and the heat cycle chamber, and the required temperature of the cooling water is 10 ° C. to 20 ° C. Often temperatures are required.
통상 사용되는 냉각수는 냉각탑을 이용한 순환식 계를 가지게 되며, 봄, 가을, 겨울 등 대기 온도가 저온일 때에는 문제없이 이러한 온도 조건을 만족시킬 수 있게 되지만 여름철 외부온도가 30도를 육박하는 경우가 되면, 냉각수 입구온도가 너무 높아 장비를 작동할 수 없는 상황이 발생하게 된다.Commonly used cooling water has a circulation system using a cooling tower, and when the temperature of the air is low, such as spring, autumn, and winter, it is possible to satisfy these temperature conditions without problems, but when the external temperature of summer approaches 30 degrees As a result, the cooling water inlet temperature is too high to operate the equipment.
이런 여름에도 장비를 원활히 동작시키기 위해선 냉각수를 사전에 냉각시키는 방법이 유일한 방법일 수 있다.Even in this summer, the only way to keep the equipment running is to cool it.
열진공챔버의 경우는 극저온 냉매인 LN2를 이용하여 챔버 슈라우드의 온도를 낮추는 방법을 사용하고 있기 때문에, 극저온 냉매 LN2는 쉽게 이용할 수 있어, 이를 이용하여 냉각수의 온도를 효율적으로 낮출 수 있는 냉각수 사전 냉각장치를 필요로 하게 된다.In the case of the thermal vacuum chamber, the method of lowering the temperature of the chamber shroud by using the cryogenic refrigerant LN2 is used. Therefore, the cryogenic refrigerant LN2 is easily available, and thus the cooling water pre-cooling can be used to efficiently lower the temperature of the cooling water. You need a device.
종래의 방법은 입구 냉각수 온도에 민감한 열진공챔버용 저온펌프등 장비들을 사용할 경우, 온도가 찬 지하수를 이용하여 순환시키지 않고 사용된 냉각수를 방류시키는 방법등을 사용하거나, 냉각탑 방법의 냉각수 순환방식은 여름철에는 장비를 작동시키지 못하는 것이 통상적이었다.In case of using equipment such as a low temperature pump for a thermal vacuum chamber that is sensitive to the inlet cooling water temperature, the conventional method uses a method of discharging the used cooling water without circulating the groundwater with cold temperature, or the cooling water circulation method of the cooling tower method. In the summer it was not possible to operate the equipment.
온도가 찬 지하수를 이용하여 순환시키지 않고 사용된 냉각수를 방류시키는 경우, 막대한 수자원의 낭비가 초래되었고, 온도가 찬 지하수를 획득할 수 없는 곳에선 여름철에는 이러한 장비를 사용할 수 없었다.Discharging the used cooling water without circulating it with cold groundwater caused a huge waste of water resources, and such equipment could not be used during the summer where cold groundwater could not be obtained.
본 발명은 열진공챔버에서 흔히 사용되는 극저온 냉매를 이용, 장비에 사용되는 냉각수를 사전에 냉각시킬 수 있도록 하여 온도에 민감한 장비들을 여름철에도 사용할 수 있도록 한다.The present invention allows the cooling water used in the equipment to be cooled in advance by using the cryogenic refrigerant which is commonly used in the thermal vacuum chamber, so that temperature-sensitive equipment can be used even in summer.
본 발명은 외부용기의 냉각수 입구에 정전 등으로 냉각수의 순환이 멈췄을 때도 냉각수가 얼어서 동파되지 않도록 한다.The present invention prevents freezing of the cooling water by freezing even when the circulation of the cooling water stops due to power failure or the like at the cooling water inlet of the outer container.
본 발명은 내부용기의 외벽에 핀타입의 방열판을 설치하여 냉각수와의 열교환이 잘 일어날 수 있게 한다.The present invention installs a fin type heat sink on the outer wall of the inner container to facilitate heat exchange with the cooling water.
본 발명은 전자밸브가 설치된 LN2 공급관과 배기관이 연결되어 극저온 냉매를 공급받는 내부용기의 외측으로 방열판이 설치되어 냉각수 입구로 공급되는 냉각수가 방열판과 열교환되어 냉각수 출구로 배출되도록 하는 외부용기로 구성됨을 특징으로 하는 것이다.According to the present invention, a heat sink is installed outside the inner container receiving the cryogenic refrigerant by connecting the LN2 supply pipe having the solenoid valve installed therein, and the coolant supplied to the coolant inlet is heat-exchanged with the heat sink to be discharged to the coolant outlet. It is characterized by.
도 1 은 본 발명의 바람직한 실시예를 나타낸 설치상태도1 is an installation state diagram showing a preferred embodiment of the present invention
[도면의 주요 부분에 대한 부호의 설명][Description of Symbols for Main Parts of Drawing]
1 : 외부용기 2 : 내부용기1: outer container 2: inner container
3 : 방열판 4 : 클램프3: heat sink 4: clamp
5 : 덮개 6 : 냉각수 출구5: cover 6: cooling water outlet
6' : 냉각수 온도센서 7 : 연결관6 ': Coolant temperature sensor 7: Connector
8 : 냉각수 입구 9 : 압축공기 입구8 coolant inlet 9 compressed air inlet
10, 11 : 노멀 크로스 전자밸브 12 : 온 웨이 밸브10, 11: normal cross solenoid valve 12: on-way valve
13 : 배기관 14 : LN2 공급관13 exhaust pipe 14 LN2 supply pipe
15 : 전자밸브 16 : 온도센서15 solenoid valve 16 temperature sensor
20 : 안전밸브20: safety valve
본 발명은 LN2의 소모량을 최소로 하면서 냉각수를 효율적으로 냉각시킬 수 있도록 극저온 냉매를 이용한 열진공챔버용 냉각수 사전 냉각장치를 제공하는 것으로,The present invention is to provide a cooling water pre-cooling device for a thermal vacuum chamber using a cryogenic refrigerant to efficiently cool the cooling water while minimizing the consumption of LN2,
열진공챔버용 냉각수 사전 냉각장치는 냉각원이 배관내에 존재할 수 있도록 외부용기(1)의 내부에 내부용기(2)를 설치하여 2중의 용기구조를 가지고 냉각수 입구(8)와 작동 중에 열리는 노멀 크로스 밸브(10)를 통하여 공급되는 냉각수는 연결관(7)을 통하여 외부용기(1) 내부를 통해 이동하도록 한다.The precooling device for the thermal vacuum chamber has a double container structure in which an inner container (2) is installed inside the outer container (1) so that a cooling source can be present in the pipe. The coolant supplied through the valve 10 moves through the connection tube 7 through the inside of the outer container 1.
연결관(7)을 통하여 유입되는 더운 냉각수는 내부용기(2)의 외벽에 설치된 방열판(3)과 열교환을 통하여 냉각된 후에 냉각수 온도센서(6')에 감지되며 냉각수 출구(6)를 통하여 유출될 수 있도록 하였다.The hot coolant flowing through the connection pipe 7 is cooled by heat exchange with the heat sink 3 installed on the outer wall of the inner container 2, and then detected by the coolant temperature sensor 6 ′ and flows out through the coolant outlet 6. It could be.
연결관(7)의 외측에 설치되는 안전밸브(20)는 본출원인이 선출원한 특허출원 99-66200호(열환경챔버용 동파방지 안전밸브)인 냉각수 입구(8)의 하측으로 압축공기 입구(9)가 설치되며, 압축공기 입구(9)에는 작동 중엔 닫히는 노멀 오픈 전자밸브(11)와 온 웨이 밸브(12)가 설치되어 있어서 정전 등으로 냉각수의 순환이 멈췄을 때도 냉각수가 얼어서 동파가 되지 않도록 한다.The safety valve 20 installed on the outside of the connecting pipe 7 has a compressed air inlet (8) below the cooling water inlet 8, which is the patent application 99-66200 (an anti-freeze safety valve for a thermal environment chamber), which was filed by the present applicant. 9) is installed, and the normal air solenoid valve 11 and the on-way valve 12, which are closed during operation, are installed at the compressed air inlet 9 so that the cooling water freezes even when the circulation of the cooling water stops due to a power failure. Do not
외부용기(1)와 내부용기(2)의 상단에는 덮개(5)가 외측에서 클램프(4)를 통하여 밀폐시킨다.The top of the outer container (1) and the inner container (2) (5) is sealed through the clamp (4) from the outside.
냉각수 출구(6)와 연결관(7)의 내부에는 온도센서(thermocouple)를 설치하여 냉각수의 온도를 측정할 수 있도록 하고, 이를 이용하여 냉각원에 극저온냉매(LN2등)의 공급여부를 판단할 수 있도록 한다.A temperature sensor (thermocouple) is installed inside the cooling water outlet (6) and the connection pipe (7) to measure the temperature of the cooling water, and it is possible to determine whether the cryogenic refrigerant (LN2, etc.) is supplied to the cooling source. To help.
내부용기(2)의 내부에 LN2 공급관(14)에서 냉매를 전자적으로 제어하는 전자밸브(15)를 통하여 극저온냉매를 공급하며, 내부용기(2)에서 기화된 가스가 방출되는 배기관(13)을 덮개(5)에 설치한다.The cryogenic refrigerant is supplied to the inside of the inner container 2 through the solenoid valve 15 which electronically controls the refrigerant in the LN2 supply pipe 14, and the exhaust pipe 13 through which the gas vaporized from the inner container 2 is discharged is provided. Install on the cover (5).
내부용기(2) 내면에는 온도센서(16)를 1/3 위치에 설치하여 내부면의 온도를 측정할 수 있도록 하며, 온도센서(16)를 통하여 내부용기(1)내의 LN2 잔류량을 확인할 수 있도록 한다.On the inner surface of the inner container 2, the temperature sensor 16 is installed at a third position to measure the temperature of the inner surface, and the LN2 remaining amount in the inner container 1 can be checked through the temperature sensor 16. do.
내부용기(2)의 외벽에는 핀(fin)타입의 방열판(3)을 설치하여 냉각수와의 열교환이 잘 일어날 수 있도록 하였다.A fin type heat sink 3 is installed on the outer wall of the inner container 2 so that heat exchange with the coolant can occur.
이러한 구성으로 이루어진 본 발명의 극저온 냉매(LN2)를 이용한 열진공 챔버용 냉각수 사전 냉각장치의 작동방법은 다음과 같다.The operation method of the cooling water pre-cooling device for the thermal vacuum chamber using the cryogenic refrigerant (LN2) of the present invention having such a configuration is as follows.
냉각수는 외부용기(1)에 연결된 냉각수 입구(8)를 통하여 유입되고, 냉각원인 내부용기(1)와의 방열판(3)을 통하여 열교환을 거친 후 냉각수 출구(6)를 통하여 출력된다.The coolant flows through the coolant inlet 8 connected to the outer container 1, undergoes heat exchange with the heat sink 3 with the inner container 1 as a cooling source, and is then output through the coolant outlet 6.
내부용기(2)에 극저온 냉매를 공급하는 LN2 공급관(14)은 노멀 크로스 밸브로서, 냉각수 출구(6)의 냉각수 온도센서(6')가 설정된 온도보다 높으면 열리게 되어 극저온 냉매를 공급하게 되고, 냉각수 출구(6)의 온도가 설정온도 보다 낮거나 냉각원에 설치한 온도센서(16)의 온도가 -150℃ 이하가 되면 닫히게 되어 극저온 냉매의 공급을 차단하게 된다.The LN2 supply pipe 14 for supplying the cryogenic refrigerant to the inner container 2 is a normal cross valve, and is opened when the cooling water temperature sensor 6 'of the cooling water outlet 6 is higher than the set temperature to supply the cryogenic refrigerant. When the temperature of the outlet 6 is lower than the set temperature or the temperature of the temperature sensor 16 installed in the cooling source is -150 ° C or less, it is closed to cut off the supply of the cryogenic refrigerant.
따라서 냉각수 입구(8)를 통하여 공급되는 냉각수는 외부용기(1)의 내부에서 내부용기(2)에 공급된 극저온 냉매와 열교환을 이루면서 원하는 온도의 냉각수를공급할 수 있으며, 방열판(3)을 통하여 열교환이 효과적으로 이루어지도록 하는 것이다.Therefore, the coolant supplied through the coolant inlet 8 may supply coolant having a desired temperature while performing heat exchange with the cryogenic refrigerant supplied to the inner container 2 inside the outer container 1, and heat exchange through the heat sink 3. This is done effectively.
내부용기(2)에 설치한 온도센서(16)의 온도를 측정함으로써 잔류량을 알 수 있으므로 극저온 냉매가 일정량 이하만 내부용기(2)에 존재하도록 하여 극저온 냉매가 액체상태로 외부로 배출되어 낭비되지 않도록 하는 것이다.Since the residual amount can be known by measuring the temperature of the temperature sensor 16 installed in the inner container 2, the cryogenic coolant is kept in the inner container 2 only below a certain amount so that the cryogenic coolant is discharged to the outside and is not wasted. It is to avoid.
LN2 공급관(14)을 통하여 공급되는 극저온 냉매는 좁은 관에서 큰 내부용기(2)로 팽창되고 다시 위쪽에 설치된 좁은 배기관(13)을 통하여 배출되기 때문에 전자밸브(15)의 개폐에 따른 맥동 현상이 제거되므로 순간분출로 인한 극저온 냉매의 배출을 최소화하게 된다.Since the cryogenic refrigerant supplied through the LN2 supply pipe 14 is expanded from the narrow pipe to the large inner container 2 and discharged through the narrow exhaust pipe 13 installed at the upper part, the pulsation phenomenon due to the opening and closing of the solenoid valve 15 is prevented. This eliminates the discharge of cryogenic refrigerants due to instant ejection.
안전밸브(20)는 작동이 중단되거나 정전등의 비상사태가 발생하면, 냉각수 입구(8)의 노멀 크로스 전자밸브(10)는 닫히고 압축공기 입구(9)의 노멀 오픈 전자밸브(11)가 열려 압축공기가 냉각관에 공급되면서 남아있는 냉각수를 모두 제거하여 동파의 위험을 제거하는 것이다.When the safety valve 20 is stopped or an emergency such as a power failure occurs, the normal cross solenoid valve 10 of the coolant inlet 8 is closed and the normal open solenoid valve 11 of the compressed air inlet 9 is opened. As compressed air is supplied to the cooling tube, all remaining coolant is removed to eliminate the risk of freezing.
도면중 미설명 부호 17은 드레인 밸브를 나타낸 것이다.In the figure, reference numeral 17 denotes a drain valve.
본 발명은 열진공챔버에서 흔히 사용되는 극저온 냉매를 이용하여 장비에 사용되는 냉각수를 사전에 냉각시킬 수 있어서, 냉각수 온도에 민감한 장비들을 여름철에도 가동할 수 있는 것이다.The present invention can be used to cool the cooling water used in the equipment in advance by using the cryogenic refrigerant commonly used in the thermal vacuum chamber, it is possible to operate the equipment sensitive to the coolant temperature even in summer.
본 발명은 통상적으로 사용되는 냉각탑을 이용한 순환식 계를 가지는 냉각시스템에도 쉽게 적용하여 사용할 수 있으며, 냉각수 온도를 필요시에만 조절할 수있기 때문에 수자원의 낭비 없이 장비를 가동할 수 있는 것이다.The present invention can be easily applied to a cooling system having a circulation system using a cooling tower that is commonly used, and can operate the equipment without wasting water resources because the cooling water temperature can be adjusted only when necessary.
본 발명은 내부용기가 중력에 의한 분리현상 역할을 하게 되어 요구조건을 만족시키지 못하는 가벼운 극저온 냉매는 윗쪽으로 상승한 후 배기관으로 배출되며, 상대적으로 무겁고 차가운 극저온 냉매는 내부용기에 저장되어 극저온 냉매의 소모량을 절감할 수 있는 것이다.In the present invention, the inner container acts as a separation phenomenon due to gravity, and the light cryogenic refrigerant that does not satisfy the requirements rises upwards and is discharged to the exhaust pipe, and the relatively heavy and cold cryogenic refrigerant is stored in the inner container to consume the cryogenic refrigerant. To reduce the cost.
본 발명은 LN2 공급관을 통하여 내부용기로 공급되는 극저온 냉매가 좁은 관에서 큰 내부용기로 팽창되고 다시 위쪽에 설치된 배기관을 통하여 배출되기 때문에 전자밸브의 개폐에 따른 맥동 현상등이 제거되며 따라서 순간분출로 인한 극저온 냉매의 배출을 최소화 할 수 있으며, 전자밸브의 수명을 연장시킬 수 있는 것이다.In the present invention, since the cryogenic refrigerant supplied to the inner container through the LN2 supply pipe is expanded from the narrow pipe to the large inner container and discharged through the exhaust pipe installed above, the pulsation phenomenon due to the opening and closing of the solenoid valve is eliminated. It is possible to minimize the discharge of the cryogenic refrigerant due to, and to extend the life of the solenoid valve.
본 발명은 냉각수 출구의 온도를 설정 변경하여 실제 장비로 유입되는 냉각수의 온도를 조절할 수 있는 것이다.The present invention can adjust the temperature of the coolant flowing into the actual equipment by changing the setting of the temperature of the coolant outlet.
본 발명은 정전 등으로 인해 냉각수의 흐름이 정지되었을 때도 냉각배관이 동파되지 않고 안전하게 사용할 수 있는 것이다.The present invention can be used safely without freezing the cooling pipe even when the flow of the cooling water is stopped due to power failure.
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| KR10-2001-0020529A KR100384492B1 (en) | 2001-04-17 | 2001-04-17 | Pre-cooling device for cooling water of thermal vacuum chamber using Liquid Nitrogen |
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| KR10-2001-0020529A KR100384492B1 (en) | 2001-04-17 | 2001-04-17 | Pre-cooling device for cooling water of thermal vacuum chamber using Liquid Nitrogen |
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| KR101034823B1 (en) * | 2008-12-18 | 2011-05-16 | 한국항공우주연구원 | Cryogenic Gas Generator |
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| JPH0725902U (en) * | 1993-10-18 | 1995-05-16 | 泰生 橘田 | Centrifugal evaporator cooling trap |
| JPH09209933A (en) * | 1996-01-29 | 1997-08-12 | Nippon Sanso Kk | Condensation trap |
| JPH09209934A (en) * | 1996-01-29 | 1997-08-12 | Nippon Sanso Kk | Condensation trap |
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| JPH0725902U (en) * | 1993-10-18 | 1995-05-16 | 泰生 橘田 | Centrifugal evaporator cooling trap |
| JPH09209933A (en) * | 1996-01-29 | 1997-08-12 | Nippon Sanso Kk | Condensation trap |
| JPH09209934A (en) * | 1996-01-29 | 1997-08-12 | Nippon Sanso Kk | Condensation trap |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR101034823B1 (en) * | 2008-12-18 | 2011-05-16 | 한국항공우주연구원 | Cryogenic Gas Generator |
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