IPC분류정보
국가/구분 |
United States(US) Patent
등록
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국제특허분류(IPC7판) |
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출원번호 |
US-0694469
(1985-01-24)
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발명자
/ 주소 |
- Brodbeck, Howard D.
- Krongold, Martin A.
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출원인 / 주소 |
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대리인 / 주소 |
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인용정보 |
피인용 횟수 :
11 인용 특허 :
3 |
초록
▼
A system for delivering cryogenic liquids at controlled low pressures is disclosed, wherein the liquid is withdrawn from the bottom of a container, and allowed to flow by gravity to the point of use. The system comprises an inlet conduit which directs a liquid cryogen into the container. The inlet c
A system for delivering cryogenic liquids at controlled low pressures is disclosed, wherein the liquid is withdrawn from the bottom of a container, and allowed to flow by gravity to the point of use. The system comprises an inlet conduit which directs a liquid cryogen into the container. The inlet conduit is connected to a float valve assembly which regulates the height of the liquid in the container. The vertical position of the float valve assembly is adjustable. The liquid cryogen is withdrawn from the bottom of the container, through an insulated outlet conduit. The pressure of the output liquid is determined by the vertical distance between the lower end of the outlet conduit and the liquid level in the container. Adjustment of the position of the float valve assembly therefore controls the output pressure. Gas bubbles that may form in the liquid tend to rise to the top of the container, so that the output is of a single phase, that is, an essentially pure liquid.
대표청구항
▼
1. Apparatus for delivering cryogenic liquids at controlled low pressures, comprising: (a) container means, adapted for storing a cryogenic liquid, the container means having an insulated wall, (b) inlet conduit means for introducing cryogenic liquids into the container means, the inlet conduit
1. Apparatus for delivering cryogenic liquids at controlled low pressures, comprising: (a) container means, adapted for storing a cryogenic liquid, the container means having an insulated wall, (b) inlet conduit means for introducing cryogenic liquids into the container means, the inlet conduit means having an interior portion and a flexible exterior portion, the inlet conduit means extending through an adjustable sleeve means mounted in the wall of the container means, wherein the length of the interior portion of the inlet conduit means can be adjusted by varying the position of the sleeve means, (c) a float ball and float valve assembly, disposed within the container means, for regulating the height of the liquid within the container means, the float ball and valve being connected to the inlet conduit means, and (d) outlet conduit means, the outlet conduit means being disposed at the bottom of the container means, wherein liquid can flow by gravity out of the container means. 2. The apparatus of claim 1, wherein the float valve assembly includes a proportional valve adapted to allow liquid to enter the container means at varying rates of flow. 3. The apparatus of claim 2, further comprising a vent means communicating with the region above the liquid, within the container means. 4. The apparatus of claim 1, wherein the sleeve comprises an evacuated cylindrical member, the sleeve being slidable through an opening in the container means. 5. The apparatus of claim 1, wherein the inlet conduit means is directly connected to the sleeve, the diameter of the inlet conduit means being substantially equal to the diameter of the sleeve. 6. Apparatus for delivering a stream of cryogenic liquid from a high-pressure source to a point of use, at a precisely-controlled low pressure, comprising: (a) an insulated container having a lid, (b) an inlet conduit adapted to conduct the cryogenic liquid from the source into the container, the inlet conduit having a pressure reducing valve, at least a portion of the conduit between the pressure reducing valve and the container being flexible, the inlet conduit extending into the container through an adjustable sleeve mounted in the lid of the container, (c) a float ball and valve assembly for regulating the liquid level within the container, the float ball and valve assembly being connected to the portion of the conduit extending into the container, the vertical position of the float ball and valve being variable according to the vertical position of the adjustable sleeve, the float ball and valve being adapted to control the flow of liquid from the conduit into the container, and (d) outlet conduit means disposed near the bottom of the container. 7. The apparatus of claim 6, wherein the sleeve comprises an evacuated cylindrical member, the sleeve being slidable through an opening in the lid of the container. 8. The apparatus of claim 6, wherein the inlet conduit is directly connected to the sleeve. 9. The apparatus of claim 8, wherein the float valve is a proportional valve. 10. The apparatus of claim 9 further comprising bypass valve means, adapted to provide a path for cryogenic liquid around the pressure reducing valve. 11. A method for delivering a cryogenic liquid from a high-pressure source, at a controlled low pressure, comprising the steps of: (a) directing a stream of cryogenic liquid through a conduit and into a container, the conduit being attached to a float ball and valve assembly, (b) adjusting the level of the liquid in the container by varying the length of the portion of the conduit extending into the container, thereby varying the vertical position of the float ball and valve assembly, and (c) withdrawing liquid, by gravity, from the bottom of the container. 12. The method of claim 11, wherein the directing step is preceded by the step of passing the liquid through a pressure reduction means.
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