SIPHON FOR DELIVERY OF LIQUID CRYOGEN FROM DEWAR FLASK
First Claim
1. A siphon for feeding liquid cryogen from a Dewar flask, comprising:
- a central feeding conduit;
an external conduit containing said central feeding conduit;
seal means sealing said external conduit to the Dewar flask;
seal means sealing said central feeding conduit with said external conduit; and
capillary means situated between upper sections of said central feeding and external conduits;
wherein the liquid cryogen is fed through said central feeding conduit from the Dewar flask.
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Accused Products
Abstract
A siphon for delivery of a liquid cryogen from a container such as a Dewar flask. The siphon ensures delivery of a liquid cryogen with a lower proportion of the gaseous fraction. The siphon comprises a central feeding conduit, which is largely contained within the Dewar flask. There is an auxiliary conduit surrounding the central feeding conduit; the outer upper section of this auxiliary conduit is provided with an adjustable valve intended to release a gaseous fraction of the cryogen contained in the annular gap between the auxiliary and central feeding conduits. The upper section of the central feeding conduit is provided with an external layer of a porous capillary coating or with a wick; this ensures that the upper section of the central feeding conduit is continuously wetted with the liquid cryogen. This porous capillary coating prevents gasification of the liquid cryogen in the central feeding conduit. Alternatively, the problem of liquid cryogen gasification may be solved through thermal insulation of the central feeding conduit.
102 Citations
37 Claims
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1. A siphon for feeding liquid cryogen from a Dewar flask, comprising:
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a central feeding conduit; an external conduit containing said central feeding conduit; seal means sealing said external conduit to the Dewar flask; seal means sealing said central feeding conduit with said external conduit; and capillary means situated between upper sections of said central feeding and external conduits; wherein the liquid cryogen is fed through said central feeding conduit from the Dewar flask. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 36)
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35. A siphon for feeding liquid cryogen from a Dewar flask, comprising:
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a central feeding conduit; a thermal insulation around the upper section of said central feeding conduit; and seal means for sealing said central feeding conduit to the Dewar flask; wherein the liquid cryogen is fed through said central feeding conduit from the Dewar flask.
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37. A siphon for feeding liquid cryogen from a Dewar flask, comprising:
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a central feeding conduit; an external conduit containing said central feeding conduit; seal means sealing said external conduit to the Dewar flask; seal means sealing said central feeding conduit with said external conduit; and a jacket for surrounding an upper section of said central feeding conduit, wherein an internal space between said jacket and said central feeding conduit is evacuated, and wherein the liquid cryogen is fed through said central feeding conduit from the Dewar flask.
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Specification