IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0813864
(2010-06-11)
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등록번호 |
US-8628238
(2014-01-14)
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발명자
/ 주소 |
- Fesmire, James E.
- Dokos, Adam G.
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출원인 / 주소 |
- The United States of America as represented by the Administrator of the National Aeronautics and Space Administration
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대리인 / 주소 |
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인용정보 |
피인용 횟수 :
2 인용 특허 :
8 |
초록
▼
A multi-purpose, cylindrical thermal insulation test apparatus is used for testing insulation materials and systems of materials using a liquid boil-off calorimeter system for absolute measurement of the effective thermal conductivity (k-value) and heat flux of a specimen material at a fixed environ
A multi-purpose, cylindrical thermal insulation test apparatus is used for testing insulation materials and systems of materials using a liquid boil-off calorimeter system for absolute measurement of the effective thermal conductivity (k-value) and heat flux of a specimen material at a fixed environmental condition (cold-side temperature, warm-side temperature, vacuum pressure level, and residual gas composition). The apparatus includes an inner vessel for receiving a liquid with a normal boiling point below ambient temperature, such as liquid nitrogen, enclosed within a vacuum chamber. A cold mass assembly, including the upper and lower guard chambers and a middle test vessel, is suspended from a lid of the vacuum canister. Each of the three chambers is filled and vented through a single feedthrough. All fluid and instrumentation feedthroughs are mounted and suspended from a top domed lid to allow easy removal of the cold mass. A lift mechanism allows manipulation of the cold mass assembly and insulation test article.
대표청구항
▼
1. An apparatus for use as an evaporation or boil-off flow measuring device for determining thermal performance of a testing material, comprising: a cold mass assembly comprising: an inner vessel having a top, a bottom, a sidewall defining a testing chamber, and a sidewall for receiving a testing ma
1. An apparatus for use as an evaporation or boil-off flow measuring device for determining thermal performance of a testing material, comprising: a cold mass assembly comprising: an inner vessel having a top, a bottom, a sidewall defining a testing chamber, and a sidewall for receiving a testing material,an upper guard chamber positioned at the top of the inner vessel, anda lower guard chamber positioned at the bottom of the inner vessel;an outer vacuum chamber enclosing the inner vessel and the testing material;a plurality of liquid conduits for receiving a liquid refrigerant having a normal boiling point below ambient temperature and for venting gas, each of the plurality of liquid conduits communicating through the outer vacuum chamber to a respective one of the testing chamber, the upper guard chamber, and the lower guard chamber; anda system of heater elements mounted on a sleeve mounted inside the outer vacuum chamber to provide warm temperature control. 2. The apparatus of claim 1, wherein each of the plurality of liquid conduits comprises a pair of elongate feedthroughs on an upper side of each chamber sized to receive a respective filling tube that is concentric to the elongate feedthrough and extending into the respective chamber, the feedthrough and filling tube sized for a sufficient vent path between the filling tube and the conduit. 3. The apparatus of claim 2, wherein each filling tube comprises a plurality of holes sized to balance cold gas spray effect and rate of filling. 4. The apparatus of claim 1, wherein each of the plurality of liquid conduits comprises an elongate feedthrough on an upper side of each chamber sized to receive a respective filling tube that is concentric to the elongate feedthrough and extending into the respective chamber, the feedthrough and filling tube sized for a sufficient vent path. 5. The apparatus of claim 4, wherein the vacuum chamber comprises a top lid that is detachable from an outer vacuum can, each of the elongate feedthroughs comprising an upper portion that passes through the top lid and connected by a connector to a lower portion that is attached to a cold mass assembly comprised of the testing chamber, the upper guard chamber, and the lower guard chamber. 6. The apparatus of claim 5, further comprising a vacuum port and a vacuum instrumentation feedthrough mounted on the vacuum chamber. 7. The apparatus of claim 5, wherein each of the elongate feedthroughs comprises a respective bellows of sufficiently thin-wall construction for low thermal conduction and mechanical compliance, each bellows comprising an upper bellows connection and a lower bellows connection. 8. The apparatus of claim 7, wherein the upper and lower bellows connection is dimensioned to enable full cryogenic temperature and high vacuum pressure compatibility with minimal leakage and enable removal of the cold mass assembly from the top lid. 9. The apparatus of claim 8, wherein the upper and lower bellows connection further comprises a spherical face seal metal-gasketed fittings. 10. The apparatus of claim 5, further comprising a plurality of handling tools attached to the cold mass assembly for manipulating during installation on a horizontal wrapping machine for test article preparations. 11. The apparatus of claim 5, further comprising a lifting mechanism attachable to the top lid for raising the cold mass assembly from the outer vacuum can. 12. The apparatus of claim 11, further comprising a temperature instrumentation feedthrough provided in the top lid for facilitating removal of the cold mass assembly using the lifting mechanism. 13. The apparatus of claim 11, wherein the lifting mechanism further comprises: a lifting frame;a vertical jack screw supported by the lifting frame; anda lift arm assembly that is received for movement on the vertical jack screw. 14. The apparatus of claim 13, further comprising an elevator frame that is attached for vertical movement to the lifting frame and that is attached to the lift arm assembly to form a carriage, wherein the lift arm assembly further comprises a pair of breakaway arms proximally, pivotally attached and pinned to the elevator frame for breakaway vertical rotation and distally engageable to the outer vacuum chamber. 15. The apparatus of claim 13, further comprising a bellows that receives for rotation the vertical jack screw. 16. The apparatus of claim 1, further comprising a plurality of threads or wires for suspending the cold mass assembly within the outer vacuum chamber. 17. The apparatus of claim 16, wherein the plurality of threads are aromatic polyamide fiber threads. 18. The apparatus of claim 16, wherein the plurality of threads are stainless steel wire. 19. The apparatus of claim 1, further comprising at least one warm boundary temperature sensor located on the testing material or the inside of the vacuum chamber, with the warm boundary temperature sensor being spaced a given distance from the sidewall of the inner vessel. 20. The apparatus of claim 19, further comprising at least one cold boundary temperature sensor located on the testing material at a location nearest the inner vessel. 21. The apparatus of claim 20, wherein the warm boundary temperature sensor and the cold boundary temperature sensors are selected from a group consisting of thermocouples, resistance temperature detectors, and silicon diodes. 22. The apparatus of claim 1, further comprising at least one temperature sensor feed-through port in the outer vacuum chamber. 23. The apparatus of claim 1, further comprising: at least one vacuum port in the outer vacuum chamber; anda baffle plate installed over an entrance to the at least one vacuum port. 24. The apparatus of claim 1, wherein the outer vacuum chamber operates in a pressure range between 1×10-6 torr to 760 torr, or 1×10-9 torr to 1000 torr, or higher. 25. The apparatus of claim 1, further comprising wherein each of the plurality of liquid conduits comprises an elongate feedthrough on an upper side of each chamber sized to receive an insertable filling tube that is concentric to the elongate feedthrough and extending into the respective chamber, the elongate feedthrough and insertable filling tube sized for a sufficient vent path between the filling tube and the conduit, the insertable filling tube comprising a funnel that is exposed outside of the elongate feedthrough for vertical filling. 26. An apparatus for use as an evaporation or boil-off flow measuring device for determining thermal performance of testing material, comprising: a cold mass assembly comprising: an inner vessel having a top, a bottom, a sidewall defining a testing chamber, and a sidewall for receiving a testing material,an upper guard chamber positioned at the top of the inner vessel, anda lower guard chamber positioned at the bottom of the inner vessel;an outer vacuum chamber comprising an outer vacuum can sized to enclose the cold mass assembly and the testing material and comprising a top lid that is detachable from the outer vacuum can and comprising at least one lifting support;a plurality of elongate feedthroughs for receiving a liquid refrigerant having a normal boiling point below ambient temperature and for venting gas, each of the plurality of elongate feedthroughs communicating through the outer vacuum chamber to a respective one of the testing chamber, the upper guard chamber, and the lower guard chamber, each of the elongate feedthroughs comprising an upper portion that passes through the top lid and connected by a connector to a lower portion that is attached to the cold mass assembly comprised of the testing chamber, the upper guard chamber, and the lower guard chamber; andsuspension strings attaching the cold mass assembly to an underside of the top lid;wherein detaching the top lid from the outer vacuum can allows lifting of the cold mass assembly and the plurality of elongated feedthroughs at the at least one lifting support to install the testing material, andwherein the outer vacuum can further comprises a sleeve support and guide positioned to support a lower surface of the cold mass assembly. 27. The apparatus of claim 24, further comprising a lifting mechanism attachable to the top lid for raising the cold mass assembly, rotating the cold mass assembly over the outer vacuum chamber, and lowering cold mass assembly into the outer vacuum can. 28. The apparatus of claim 27, wherein the lifting mechanism is laterally rotatable. 29. The apparatus of claim 28, further comprising a turntable that supports the lifting mechanism for lateral rotation.
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