CN103884519A - Ultralow temperature vacuum heat transfer efficiency test system - Google Patents
Ultralow temperature vacuum heat transfer efficiency test system Download PDFInfo
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- CN103884519A CN103884519A CN201210556888.8A CN201210556888A CN103884519A CN 103884519 A CN103884519 A CN 103884519A CN 201210556888 A CN201210556888 A CN 201210556888A CN 103884519 A CN103884519 A CN 103884519A
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Abstract
The invention pertains to a test system, and specifically relates to an ultralow temperature vacuum heat transfer efficiency test system comprising a liquid nitrogen circulation loop, a vacuum system, and a temperature measuring and recording system. A tested element is placed in the vacuum system. The vacuum system is used to make the tested element be in the vacuum insulation condition. Partial loop of the liquid nitrogen circulation loop is placed in the vacuum system for cooling the tested element. The temperature measuring and recording system is used to measuring the temperature of the tested element and recording related data. The ultralow temperature vacuum heat transfer efficiency test system of the invention has the following significant advantages that the system heat transfer test occurs under the vacuum, insulation and ultralow temperature conditions, so the influences on convection, heat conduction and thermal radiation can be furthest reduced, and the actual working temperature of a superconducting coil supporting portion can be reached, so the ultralow temperature heat transfer efficiency of the tested element can be effectively measured.
Description
Technical field
The invention belongs to test macro, be specifically related to a kind of ultra low temperature vacuum heat transfer efficiency test macro.
Background technology
For guaranteeing the normal work of fusion reactor superconducting coil, the temperature of the support section of close superconducting coil should be not more than 80K (193 ℃), the inner cooling-part that is connected with high pressure low temperature helium flow need be installed on these parts and realize.Being connected between cooling-part and support section must have higher heat transfer efficiency, and helium flow can remain on support section at a lower temperature.If heat transfer efficiency is low, the too high superconducting coil temperature that will cause of support section temperature raises and then quench, causes a serious accident.And adopt different its heat transfer efficiency differences of cooling-part that connect technological parameter, need to test accurately its heat transfer efficiency to determine connection technological parameter.
The heat transfer efficiency result of existing heat exchanger, air conditioner etc. is mostly calculated and is obtained by experience estimation, theoretical model analysis, can not accurately reflect actual conditions, and error is larger.And current done heat transfer efficiency test mostly is under normal temperature and pressure conditions, and external environment is larger on the impact of test result.
Summary of the invention
The present invention is directed to the defect of prior art, the ultra low temperature vacuum heat transfer efficiency that is affected by the external environment little test macro is provided.
The present invention is achieved in that a kind of ultra low temperature vacuum heat transfer efficiency test macro, comprise liquid nitrogen closed circuit, vacuum system and temperature test and register system, wherein, test specimen is placed in vacuum system, vacuum system is used for making test specimen under vacuum insulation condition, the part loop of liquid nitrogen closed circuit is placed in vacuum system for test specimen is lowered the temperature, and temperature test and register system are used for measuring test specimen temperature and record related data.
A kind of ultra low temperature vacuum heat transfer efficiency test macro as above, wherein, described liquid nitrogen closed circuit is by gas-liquid separator, from boost fluid nitrogen cascade, in liquid nitrogen loop and vacuum chamber, test specimen composition, is connected with gas-liquid separator from the output terminal of boost fluid nitrogen cascade, and is controlled by gas-liquid separator, the output terminal of gas-liquid separator be arranged on the test specimen UNICOM in vacuum system, return to gas-liquid separator through the liquid nitrogen of test specimen by liquid nitrogen loop.
A kind of ultra low temperature vacuum heat transfer efficiency test macro as above, wherein, described vacuum system is by vacuum chamber, vacuum meter, Mechanical Driven vacuum pump, Roots vaccum pump composition, vacuum chamber is square box structure, for test specimen provides vacuum insulation environment, Mechanical Driven vacuum pump and Roots vaccum pump make vacuum chamber reach required vacuum tightness, and vacuum meter is for detection of vacuum degree in vacuum chamber, Mechanical Driven vacuum pump, Roots vaccum pump, vacuum chamber is connected successively, and vacuum meter is arranged between Roots vaccum pump and the pipeline of vacuum chamber UNICOM.
A kind of ultra low temperature vacuum heat transfer efficiency test macro as above, wherein, described temperature test and register system are shown and registering instrument by temperature, temperature sensor composition, temperature sensor is A level PT100 thermal resistance temperature sensor, pass to temperature demonstration and registering instrument for detection of test specimen temperature and by signal, registering instrument can show in real time test specimen temperature and record once every 60s, and temperature demonstration is realized and being connected by the sealed interface on vacuum chamber with registering instrument and temperature sensor.
Remarkable result of the present invention is: native system heat transfer testing occurs under vacuum, thermal insulation, condition of ultralow temperature, convection current, heat conduction, thermal-radiating impact are reduced to greatest extent, and reach the actual work temperature of superconducting coil support section, can effectively measure the ultralow temperature heat transfer efficiency of test specimen.
Accompanying drawing explanation
Fig. 1 is the structural representation of a kind of ultra low temperature vacuum heat transfer efficiency test macro provided by the invention;
Fig. 2 is vacuum chamber inner structure schematic diagram.；
In figure: 1 gas-liquid separator; 2 from boost fluid nitrogen cascade; 3 temperature show and registering instrument; 4 vacuum chambers; 5 liquid nitrogen loops; 6 vacuum meters; 7 Mechanical Driven vacuum pumps; 8 Roots vaccum pumps; 9 test specimens; 10 temperature sensors; 11 sensor sealed interfaces; 12 vacuum pump sealed interfaces.
Embodiment
Below with reference to Fig. 1 and Fig. 2 to being introduced according to the first embodiment of the present invention.As shown in Figure 1, a kind of ultra low temperature vacuum heat transfer efficiency test macro, comprises liquid nitrogen closed circuit, vacuum system and temperature test and register system composition.Wherein, test specimen is placed in vacuum system, vacuum system is used for making test specimen under vacuum insulation condition, the part loop of liquid nitrogen closed circuit is placed in vacuum system for test specimen is lowered the temperature, and temperature test and register system are used for measuring test specimen temperature and record related data.
Described liquid nitrogen closed circuit is by gas-liquid separator 1, and from boost fluid nitrogen cascade 2, in liquid nitrogen loop 5 and vacuum chamber, test specimen 9 forms.Gas-liquid separator 1 volume 50L, import arranges pneumatic valve, its unlatching or close by the tank gage control in gas-liquid separator 1.The vacuum multi-layer insulation cool-bag that is 175L from boost fluid nitrogen cascade 2, working pressure 0.27-1.1MPa.Liquid nitrogen loop 5 is vacuum pipe, and pipe design pressure is 1.6MPa, layer vacuum>=1 × 10
-3pa, duct segments is made, every section of independent vacuum, type of attachment is vacuum heat-preserving flange structure.When reaching working pressure from boost fluid nitrogen cascade 2, liquid nitrogen is by liquid nitrogen loop 5 injected gas liquid/gas separators 1, and enters test specimen along liquid nitrogen loop 5.
Described vacuum system is by vacuum chamber 4, vacuum meter 6, and Mechanical Driven vacuum pump 7, Roots vaccum pump 8 forms.Vacuum chamber 4 is square box structure, for test specimen 9 provides vacuum insulation environment.Mechanical Driven vacuum pump 7 and Roots vaccum pump 8 make vacuum chamber 4 reach required vacuum tightness.Vacuum meter 6 is for detection of vacuum degree in vacuum chamber.Mechanical Driven vacuum pump 7, Roots vaccum pump 8, vacuum chamber 4 is connected successively.Pack into after vacuum chamber 4 sealing at test specimen, first Mechanical Driven vacuum pump 7 vacuumizes vacuum chamber 4 by vacuum pump sealed interface 12, after vacuum meter 6 measurement of vacuum reach below 10Pa, opens Roots vaccum pump 8, when vacuum tightness reaches 5 × 10
-2after Pa, open liquid nitrogen injection valve liquid nitrogen closed circuit 5 is injected to liquid nitrogen.
Described temperature test and register system are by temperature demonstration and registering instrument 3, and temperature sensor 10 forms.Temperature sensor 10 is A level PT100 thermal resistance temperature sensor, passes to temperature demonstration and registering instrument 3 for detection of the temperature of test specimen 9 and by signal, and the latter can show in real time the temperature of test specimen 9 and record once every 60s.Temperature shows with registering instrument 3 and is connected by 11 realizations of sensor sealed interface with temperature sensor 10.
The present embodiment for the operating process of actual test is: first test specimen organic solvent is cleaned to reduce venting while vacuumizing, guarantee vacuum tightness, reduce the impact of convection current on heat transfer efficiency test; Mounting temperature sensor on test specimen, and adopt the adiabatic covering parcel of Multilayer radiation-proof, bottom adopts thermal insulation material to support, the impact of the heat conduction of minimizing heat radiation and surrounding enviroment on heat transfer efficiency test; Again clean test specimen, and sent into vacuum chamber, connect liquid nitrogen loop joint, temperature sensor joint; Sealed vacuum chamber, opens Mechanical Driven vacuum pump, in the time that vacuum meter shows that vacuum tightness reaches below 10Pa, opens Roots vaccum pump until vacuum tightness reaches 5 × 10
-2pa; Open liquid flowing valve, liquid nitrogen is injected to test specimen, open temperature simultaneously and show and registering instrument, automatically record test specimen temperature variation.According to the result of the size of test specimen, material, physical property and temperature variation, calculate the heat transfer efficiency that adopts the different test specimens that connect technological parameter.
Claims (4)
1. a ultra low temperature vacuum heat transfer efficiency test macro, it is characterized in that: comprise liquid nitrogen closed circuit, vacuum system and temperature test and register system, wherein, test specimen is placed in vacuum system, vacuum system is used for making test specimen under vacuum insulation condition, the part loop of liquid nitrogen closed circuit is placed in vacuum system for test specimen is lowered the temperature, and temperature test and register system are used for measuring test specimen temperature and record related data.
2. a kind of ultra low temperature vacuum heat transfer efficiency test macro as claimed in claim 1, it is characterized in that: described liquid nitrogen closed circuit is by gas-liquid separator (1), from boost fluid nitrogen cascade (2), test specimen composition in liquid nitrogen loop (5) and vacuum chamber, output terminal from boost fluid nitrogen cascade (2) is connected with gas-liquid separator (1), and be controlled by gas-liquid separator (1), the output terminal of gas-liquid separator (1) be arranged on the test specimen UNICOM in vacuum system, return to gas-liquid separator (1) through the liquid nitrogen of test specimen by liquid nitrogen loop (5).
3. a kind of ultra low temperature vacuum heat transfer efficiency test macro as claimed in claim 1, it is characterized in that: described vacuum system is by vacuum chamber (4), vacuum meter (6), Mechanical Driven vacuum pump (7), Roots vaccum pump (8) composition, vacuum chamber (4) is square box structure, for test specimen provides vacuum insulation environment, Mechanical Driven vacuum pump (7) and Roots vaccum pump (8) make vacuum chamber (4) reach required vacuum tightness, vacuum meter (6) is for detection of vacuum degree in vacuum chamber, Mechanical Driven vacuum pump (7), Roots vaccum pump (8), vacuum chamber (4) is connected successively, vacuum meter (6) arranges between Roots vaccum pump (8) and the pipeline of vacuum chamber (4) UNICOM.
4. a kind of ultra low temperature vacuum heat transfer efficiency test macro as claimed in claim 1, it is characterized in that: described temperature test and register system are shown and registering instrument (3) by temperature, temperature sensor (10) composition, temperature sensor (10) is A level PT100 thermal resistance temperature sensor, pass to temperature demonstration and registering instrument (3) for detection of test specimen temperature and by signal, registering instrument (3) can show in real time test specimen temperature and record once every 60s, temperature shows with registering instrument (3) and is connected by sealed interface (11) realization on vacuum chamber (4) with temperature sensor (10).
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| CN201210556888.8A CN103884519A (en) | 2012-12-20 | 2012-12-20 | Ultralow temperature vacuum heat transfer efficiency test system |
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| CN201210556888.8A CN103884519A (en) | 2012-12-20 | 2012-12-20 | Ultralow temperature vacuum heat transfer efficiency test system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111855736A (en) * | 2020-03-18 | 2020-10-30 | 同济大学 | Electricity card performance test system |
| CN112197818A (en) * | 2020-12-02 | 2021-01-08 | 江西联创光电超导应用有限公司 | Superconducting magnet performance detection equipment and method |
| CN113834848A (en) * | 2020-06-08 | 2021-12-24 | 核工业西南物理研究院 | Heat conduction efficiency test system of heat exchange structure under ultra-low temperature vacuum state |
| CN113885310A (en) * | 2020-07-01 | 2022-01-04 | 东北大学 | Intelligent control system for vacuum dry pump test |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111855736A (en) * | 2020-03-18 | 2020-10-30 | 同济大学 | Electricity card performance test system |
| CN111855736B (en) * | 2020-03-18 | 2022-02-18 | 同济大学 | Electricity card performance test system |
| CN113834848A (en) * | 2020-06-08 | 2021-12-24 | 核工业西南物理研究院 | Heat conduction efficiency test system of heat exchange structure under ultra-low temperature vacuum state |
| CN113885310A (en) * | 2020-07-01 | 2022-01-04 | 东北大学 | Intelligent control system for vacuum dry pump test |
| CN113885310B (en) * | 2020-07-01 | 2023-03-28 | 东北大学 | Intelligent control system for vacuum dry pump test |
| CN112197818A (en) * | 2020-12-02 | 2021-01-08 | 江西联创光电超导应用有限公司 | Superconducting magnet performance detection equipment and method |
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Application publication date: 20140625 |