摘要:
A lightweight, partially evacuated load-supporting insulation panel (1) comprising an outer gas-impermeable envelope (2) and an inner gas-permeable envelope (3). The inner envelope is filled with a mixture of coarse gas-permeable granules (4) and fine gas-permeable particles (5), void spaces formed within and between said granules and particles containing a gas of low thermal conductivity. An intermediate gas-impermeable envelope (7) may also be used.
摘要:
Process for evacuating the thermally insulating jacket (5) of a dewar (1) having an inner wall (2) and an outer wall (4), with the inner space between said walls completely partially filled with an insulating material (9), containing also a moisture sorbing material (10) and a getter material (11), in which said moisture sorbing material is a chemical drying agent, and said getter material is a Ba-Li alloy.
摘要:
A vertically-oriented cryogenic fluid cylinder includes an inner vessel for holding cryogenic fluid, an outer vessel surrounding the inner vessel, and a liquid level gauge for indicating a liquid level within the inner vessel. The liquid level gage includes a level indicator located outside of the outer vessel, a support arm extending down into the inner vessel, a swing arm pivotably secured to the support arm and connected to the level indicator so that angular position of the swing arm provides an indication of liquid level within the inner vessel on the level indicator, and a float on the swing arm that pivots the swing arm as the liquid level rises and lowers. The support arm forms an acute angle with the central longitudinal axis of the inner vessel so that the swing arm can be longer to move over a larger portion of the length of the inner vessel.
摘要:
Apparatus and methods for improving the safety and efficiency and decreasing the cost of producing liquid gas, such as liquid oxygen, with a small-scale use liquefaction device, according to various embodiments of the present invention. In one embodiment, liquid oxygen barrier (118) may be added to interface between a cryocooler (102) and a dewar (120) to control a rate of liquid oxygen escape upon a tipping of the dewar (120). A boiloff vessel (560) in fluid communication with dewar (120) allows expanding gas from a tipped dewar (120) to escape while allowing the liquid to safely settle in the boiloff vessel (560). A temperature sensor (299, 297), in proximity with a heat dissipator or cold finger of the cryocooler (102), is operable to break an electrical power circuit of the cryocooler or cooling fan when a sensed temperature exceeds a predetermined temperature. Oxygen purity of a feed stream of gas may be sensed and/or displayed.
摘要:
An improved dewar design that accelerates the manufacturing process of a dewar. In a preferred embodiment, the dewar includes an evacution port that may be larger in size by a factor of ten over the size of evacuation ports of conventional dewars. The oversized evacuation port, however, does not result in an increase in the overall size or profile of the dewar. The dewar is evacuated and hermetically sealed using an re-usable evacuation tool.
摘要:
A sensor apparatus is described that detects and indicates the quantity of cryogenic liquid in a Dewar container (10), independent of the spatial orientation and the physical motions acting on the container.
摘要:
A flexible multi-layer getter with a gas-permeable layer covering a gas reservoir layer. In an embodiment, the gas-permeable layer covers part of the gas reservoir layer. In another embodiment, a barrier covers part of the gas reservoir layer. The barrier may include a foil substrate, a passivation layer, or a gas-permeable layer.
摘要:
A lightweight, cryogenic-compatible pressure vessel for flexibly storing cryogenic liquid fuels or compressed gas fuels at cryogenic or ambient temperatures. The pressure vessel has an inner pressure container enclosing a fuel storage volume, an outer container surrounding the inner pressure container to form an evacuated space therebetween, and a thermal insulator surrounding the inner pressure container in the evacuated space to inhibit heat transfer. Additionally, vacuum loss from fuel permeation is substantially inhibited in the evacuated space by, for example, lining the container liner with a layer of fuel-impermeable material, capturing the permeated fuel in the evacuated space, or purging the permeated fuel from the evacuated space.
摘要:
A radiation detector having an evacuated envelope (35), a radiation detector (34) on a cold finger support in the evacuated space, a closed cycle gas cooling system (3, 45) to cool the cold finger to provide cryogenic operation of the radiation detector, and a getter (5, 16) in the evacuated space to maintain an evacuated condition. The evacuated envelope includes a radiation window (25). The radiation detector is preferably an X-ray detector employed in an energy dispersive spectrometry system. The evacuated space is preferably held at a pressure of less than about 1 mTorr to achieve molecular flow of remaining gas molecules, minimizing parasitic heat input. The closed cycle gas cooling system employs compressed refrigerant, which is precooled in a counterflow heat exchanger (103) and allowed to expand in proximity to the cold finger, thus absorbing heat and maintaining cryogenic temperatures. A getter material, preferably activated carbon, is provided to absorb gasses and maintain the low pressure during operation. A vibration effect attenuation system (8) is provided to reduce effect of cooler induced reduction in detector resolution.