[특허]Cryogenic liquid tank

AeroVironment, Inc.

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특허 상세정보

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Cryogenic liquid tank

특허상세정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	F17C-001/12
출원번호	US-0533442 (2012-06-26)
등록번호	US-9829155 (2017-11-28)
발명자 / 주소	Brooks, Alexander Nelson Hibbs, Bart Dean Thompson, David Robert
출원인 / 주소	AeroVironment, Inc.
대리인 / 주소	Aagaard, Esq., Eric J.
인용정보	피인용 횟수 : 0 인용 특허 : 32

초록
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A hydrogen storage tank for a hydrogen fueled aircraft. The tank has a wall made of layers of aerogel sections around a hard shell layer, sealed within a flexible outer layer, and having the air removed to form a vacuum. The periphery of each layer section abuts other sections of that layer, but only overlies the periphery of the sections of other layers at individual points. The wall is characterized by a thermal conductivity that is lower near its gravitational top than its gravitational bottom. The tank has two exit passageways, one being direct, and ...

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1. A storage tank configured to store a cryogenic liquid, the storage tank being characterized by a gravitational bottom and a gravitational top, comprising: a lateral wall that defines and substantially surrounds a fluid storage space, the lateral wall forming an inner shell characterized by a direct-lateral-contact surface area that is configured to be in direct lateral contact with the cryogenic liquid, wherein the direct-lateral-contact surface area of the inner shell is laterally surrounded by an insulator characterized by a thermal conductivity that is different near the gravitational top of the direct-lateral-contact surface area than it is near the gravitational bottom of the direct-lateral-contact surface area. 2. The storage tank of claim 1, wherein the insulator surrounding the direct-lateral-contact surface area of the inner shell is characterized by a thermal conductivity that is lower near the gravitational top than it is near the gravitational bottom. 3. The storage tank of claim 2, wherein: the insulator surrounding the direct-lateral-contact surface area comprises a plurality of portions including a bottom portion that surrounds the gravitational bottom and a top portion that surrounds the gravitational top;throughout each portion of the plurality of portions, the insulator surrounding the direct-lateral-contact surface area is characterized by a constant thermal conductivity; andthe thermal conductivity of the top portion is lower than the thermal conductivity of the bottom portion. 4. The storage tank of claim 3, wherein the plurality of portions consists of two portions. 5. The storage tank of claim 2, wherein substantially throughout the insulator surrounding the direct-lateral-contact surface area, the thermal conductivity varies continuously from the gravitational top to the gravitational bottom. 6. The storage tank of claim 2, wherein the insulator surrounding the direct-lateral-contact surface area near the gravitational top is thicker than the insulator surrounding the direct-lateral-contact surface area near the gravitational bottom. 7. The storage tank of claim 1, wherein the insulator surrounding the direct-lateral-contact surface area is composed of an aerogel, and wherein a density of the aerogel near the gravitational top is different from a density of the aerogel near the gravitational bottom. 8. A method of forming a tank for storing a cryogenic liquid, the tank being characterized by a gravitational bottom and a gravitational top, comprising: forming a tank lateral wall that defines and substantially surrounds a fluid storage space, the lateral wall forming an inner shell characterized by a direct-lateral-contact surface area that is configured to be in direct lateral contact with the cryogenic liquid, wherein the direct-lateral-contact surface area of the inner shell is laterally surrounded by an insulator characterized by a thermal conductivity that is different near the gravitational top of the direct-lateral-contact surface area than it is near the gravitational bottom of the direct-lateral-contact surface area. 9. A storage tank configured to store a cryogenic liquid, the storage tank being characterized by a gravitational bottom and a gravitational top, comprising: a lateral wall that defines and substantially surrounds a fluid storage space, the lateral wall being characterized by a direct-lateral-contact surface area that is configured to be in direct lateral contact with the cryogenic liquid, wherein the direct-lateral-contact surface area of the wall is characterized by a thermal conductivity that is different near the gravitational top of the direct-lateral-contact surface area of the wall than it is near the gravitational bottom of the direct-lateral-contact surface area of the wall; andwherein the direct-lateral-contact surface area of the wall is composed of an aerogel, and wherein a density of the aerogel near the gravitational top of the direct-lateral-contact surface area of the wall is different from a density of the aerogel near the gravitational bottom of the direct-lateral-contact surface area of the wall. 10. The storage tank of claim 9, wherein the direct-lateral-contact surface area of the wall is characterized by a thermal conductivity that is lower near the gravitational top than it is near the gravitational bottom. 11. The storage tank of claim 10, wherein: the direct-lateral-contact surface area of the wall comprises a plurality of portions including a bottom portion that laterally contains the gravitational bottom of the direct-lateral-contact surface area of the wall and a top portion that contains the gravitational top of the direct-lateral-contact surface area of the wall;throughout each portion of the plurality of portions, the direct-lateral-contact surface area of the wall is characterized by a constant thermal conductivity; andthe thermal conductivity of the top portion is lower than the thermal conductivity of the bottom portion. 12. The storage tank of claim 11, wherein the plurality of portions consists of two portions. 13. The storage tank of claim 10, wherein substantially throughout the direct-lateral-contact surface area of the wall, the thermal conductivity varies continuously from the gravitational top to the gravitational bottom. 14. The storage tank of claim 10, wherein the direct-lateral-contact surface area of the wall near the gravitational top is thicker than the direct-lateral-contact surface area of the wall near the gravitational bottom. 15. The storage tank of claim 9, wherein the direct-lateral-contact surface area of the wall is composed of an aerogel, and wherein a density of the aerogel near the gravitational top is different from a density of the aerogel near the gravitational bottom. 16. The method of claim 8, wherein the insulator surrounding the direct-lateral-contact surface area of the inner shell is characterized by a thermal conductivity that is lower near the gravitational top than it is near the gravitational bottom. 17. The method of claim 16, wherein: the insulator surrounding the direct-lateral-contact surface area comprises a plurality of portions including a bottom portion that surrounds the gravitational bottom and a top portion that surrounds the gravitational top;throughout each portion of the plurality of portions, the insulator surrounding the direct-lateral-contact surface area is characterized by a constant thermal conductivity; andthe thermal conductivity of the top portion is lower than the thermal conductivity of the bottom portion. 18. The method of claim 17, wherein the plurality of portions consists of two portions. 19. The method of claim 16, wherein substantially throughout the insulator surrounding the direct-lateral-contact surface area, the thermal conductivity varies continuously from the gravitational top to the gravitational bottom. 20. The method of claim 16, wherein the insulator surrounding the direct-lateral-contact surface area near the gravitational top is thicker than the insulator surrounding the direct-lateral-contact surface area near the gravitational bottom. 21. The storage tank of claim 8, wherein the insulator surrounding the direct-lateral-contact surface area is composed of an aerogel, and wherein a density of the aerogel near the gravitational top is different from a density of the aerogel near the gravitational bottom.

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Cryogenic liquid tank

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Cryogenic liquid tank

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