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7614240 |
Control method for pulse tube cryocooler
Method of controlling a pulse tube cryocooler in which the power input to the acoustic source is varied to maintain temperature of a refrigeration load or a temperature that is at least referable...
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7603866 |
Thermoacoustic apparatus
In order to reduce the time until an acoustic wave is generated and perform heat exchange smoothly in a stack, a thermoacoustic apparatus 1 includes a first stack 3 a sandwiched between a first...
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7600386 |
Pulse tube cryogenic cooler
A pulse tube cryogenic cooler, includes: a pressure vibration generating device configured to generate pressure vibration in operation gas; a regenerator connected to the pressure vibration...
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7600385 |
Pulse tube cryogenic cooler
A pulse tube cryogenic cooler, includes a cold storage device cartridge whose high temperature end is connected to a pressure change source; a pulse tube whose low temperature end is connected to a...
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7594406 |
Regenerator and cryogenics pump
The invention has an object to provide a regenerator and cryogenics pump using a regenerator material which fulfills such requirements as specific heat, thermal conductivity, manufacturing...
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7587896 |
Cooled infrared sensor assembly with compact configuration
An integrated sensor assembly ( 10 ) includes a gas compression unit ( 104 ) having a first longitudinal axis ( 308 ) and a gas expansion unit ( 112 ) having a second longitudinal axis ( 366 ) and...
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7568521 |
Wellbore formation evaluation system and method
A formation evaluation tool positionable in a wellbore penetrating a subterranean formation is provided. The formation evaluation tool includes a cooling system adapted to pass a cooling fluid...
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7568353 |
Method of storing biological samples
A method of storing biological samples in which the biological samples are stored in a stack within a vessel interior of an insulated vessel. A pool of liquid cryogen is maintained within the...
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7568351 |
Multi-stage pulse tube with matched temperature profiles
Convection losses associated with different temperature profiles in the pulse tubes and regenerators of multi-stage pulse tubes mounted in helium gas in the neck tube of a MRI cryostat are reduced...
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7555908 |
Cable drive mechanism for self tuning refrigeration gas expander
A refrigeration device includes a gas displacing piston ( 362 ) movable within a gas expander cylinder ( 364 ). The volume of a gas expansion space ( 362 ) is varied as the gas displacing piston (...
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7549296 |
Low temperature cryocooler regenerator of ductile intermetallic compounds
A multi-stage cryocooler having a relatively low temperature stage to cool to less than about 15K and having a regenerator including a ductile intermetallic compound including one or more rare...
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7549295 |
Three track valve for cryogenic refrigerator
A multi valve two-stage pulse tube type GM refrigerator having a rotary valve that comprises one track for flow to the regenerator and two tracks for flow to the pulse tubes where the valve has two...
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7509814 |
Compact integrated buffer for pulse tube refrigerator
A range of buffer volume/pulse tube volume ratios for two-stage hybrid GM type pulse tube cold-heads that are designed to produce refrigeration at 4 K are provided. The ranges of volume ratios for...
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7500367 |
Cooled cryostat device
A cooled cryostat device comprising: a cold finger having infrared detector means secured to the end thereof; an outer casing surrounding the cold finger; and stiffener means for stiffening the...
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7500366 |
Refrigerator with magnetic shield
A magnetic shield is mounted in its own vacuum enclosure in a regenerative type expander comprising a vacuum enclosure, magnetic material in a cold regenerator, and a magnetic shield, where the...
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7497085 |
Refrigerating machine using the stirling cycle
A cooler machine using the Stirling cycle and comprising: at least one compressor with a compressor piston movable in a compression cyclinder; a regenerator with a regenerator piston movable in a...
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7497084 |
Co-axial multi-stage pulse tube for helium recondensation
A two-stage pulse tube refrigerator having a compact design, low vibration and low heat loss is provided where at least the 2 nd stage is co-axial but preferably, both stages are co-axial with the...
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7490473 |
System and method for predicting component failures in magnetic resonance imaging machine
The method includes obtaining input data representative of a first parameter of a cryogenic medium in a cryogenic cooling system is provided. The method further includes calculating an expected...
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7487643 |
Loop type thermo syphone, heat radiation system, heat exchange system, and stirling cooling chamber
A natural circulation circuit includes an evaporator surrounding a heat radiating portion of a Stirling refrigerating machine to absorb heat of the heat radiating portion through evaporation of a...
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7464556 |
Magnetic resonance apparatus with phase-aligned coupling-in of working gas pressure pulses
A magnetic resonance apparatus comprising a superconducting magnet coil disposed in a cryostat, and a refrigerator for cooling same comprising a compressor ( 1 ) for compressing a working gas, and...
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7444826 |
Fault current limiter
A fault current limiter comprising: an input node; an output node; a variable impedance element coupled between the input node and the output node; a multi-cycle refrigeration system, comprising a...
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7437878 |
Multi-stage pulse tube cryocooler with acoustic impedance constructed to reduce transient cool down time and thermal loss
The cool down time for a multi-stage, pulse tube cryocooler is reduced by configuring at least a portion of the acoustic impedance of a selected stage, higher than the first stage, so that it...
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7434409 |
Pulse tube cooler having ¼ wavelength resonator tube instead of reservoir
An improved pulse tube cooler having a resonator tube connected in place of a compliance volume or reservoir. The resonator tube has a length substantially equal to an integer multiple of ¼...
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7434408 |
Method for cooling an article using a cryocooler and cryocooler
A stationary point is set on a cold end of a cryocooler. An article is mounted on the stationary point to be cooled via the stationary point. In this case, the article can be cooled up to an...
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7434407 |
No-vent liquid hydrogen storage and delivery system
A hydrogen storage and delivery system is provided having an orifice pulse tube refrigerator and a liquid hydrogen storage vessel. A cooling system, coupled to the orifice pulse tube refrigerator,...
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7415830 |
Method and system for cryogenic cooling
According to one embodiment, a method for improving heat transfer between a cold finger of a cryogenic cooler and a Dewar includes forming an annulus between the cold finger of the cryogenic cooler...
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7415829 |
Piston compressor
A piston compressor comprises a piston ( 12 ) which oscillates in a cylinder ( 14 ). A compressed-gas supply arrangement is provided which comprises a compressed-gas accumulator ( 34 ), a...
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7412835 |
Apparatus and method for controlling a cryocooler by adjusting cooler gas flow oscillating frequency
Systems and methods are provided for a variable cooling capacity cryocooler for a superconducting magnetic resonance imaging device having a liquid cryogen pressure vessel to provide cryogenic...
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7404296 |
Cooling device
The present invention is a cooling device, wherein cooling is effected by enclosing a working fluid in a conduit, which is formed by providing a looped tube formed by interconnecting both...
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7404295 |
Ultra-low temperature regenerator and refrigerator
The refrigeration performance in a range from 3 to 10 K can be improved in comparison with conventional metal based magnetic regenerator materials. The refrigerator is provided with a regenerator...
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7395671 |
Cryogenic system
A cryogenic system includes a containment vessel in which a body to be cooled is housed in such a manner that the body is immersed in a liquid coolant; a tubular refrigerator sleeve; and a...
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7386984 |
Refrigerator
A refrigerator includes a Stirling refrigerating machine having a high-temperature heat radiation portion and a low-temperature heat absorption portion and for cooling a freezing compartment, and a...
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7383687 |
Regenerator method for manufacturing regenerator, system for manufacturing regenerator and stirling refrigerating machine
In a regenerator to be formed by winding a resin film into a cylindrical shape, a projection is formed on a surface of the resin film by subjecting the resin film in itself to plastic deformation,...
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7363767 |
Multi-stage pulse tube cryocooler
A three-stage pulse-tube cryocooler, in which the third stage pulse tube is arranged below the second stage pulse tube, with a gas flow conduit between the second stage pulse tube heat exchanger...
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7350363 |
Pulse tube refrigerator sleeve
The present invention relates to pulse tube refrigerators for recondensing cryogenic liquids. In particular, the present invention relates to the same for magnetic resonance imaging systems. In...
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7347210 |
Surgical drape with conductor and method of detecting fluid and leaks in thermal treatment system Basins
A drape according to the present invention includes a sensing device and is disposed over a thermal treatment system having a basin recessed therein. A drape portion is pushed down into, and...
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7347053 |
Densifier for simultaneous conditioning of two cryogenic liquids
A densifier is provided which in one embodiment can simultaneously densify two cryogenic liquids at different temperatures. The densifier has an oscillatory power source for generating oscillatory...
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RE40049 |
Precooled cryogenic ablation system
A method and apparatus for using a secondary refrigerant to precool and liquefy a primary refrigerant, then vaporizing and expanding the primary refrigerant to cool a cold tip of a cryosurgical...
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7322199 |
Stirling cooler
Disclosed is a Stirling cooler, in which a partition contacting a front surface of an inner stator is formed on a cylinder and a second stopper serving as a snap ring contacting a rear surface of...
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7318327 |
Liquefying and storing a gas
Apparatus and methods for improving the safety and efficiency and decreasing the cost of producing liquid oxygen with a small-scale use liquefaction device, according to various embodiments of the...
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7318318 |
Superconducting magnet system with refrigerator
A cryostat ( 1 ) with a first helium tank ( 4 ) which contains helium at an operating temperature T 1 <3K, and a second helium tank ( 2 ) which is connected to the first helium tank ( 4 ) and...
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7308797 |
Cryogenic refrigerator
A cryogenic refrigerator includes a first refrigerant tube and a second refrigerant tube each comprising two tubes that are arranged on a cooling stage substantially parallel to each other and...
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7305835 |
Pulse tube cooling by circulation of buffer gas
The present invention applies to single or two stage pulse tube refrigerators that have one or more passive orifices at the hot end(s) of the pulse tube(s) through which gas flows to achieve phase...
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7299640 |
Refrigeration system which compensates for heat leakage
A refrigeration system/cycle includes two or more refrigeration stages, in which one or more of the warmer stages provide(s) cooling to partially compensate for heat leakage that would otherwise...
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7296418 |
Multi-stage cryocooler with concentric second stage
A multi-stage cryocooler includes a concentric second-stage pulse tube expander in which a pulse tube is located within a second-stage regenerator. In one embodiment, an inner wall of the...
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7290396 |
Cryogenic biological preservation unit
A cryogenic biological preservation unit having a removable lid and an integrated cryocooler positioned apart from, or within a fixed portion of, the lid and which provides refrigeration to the...
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7287387 |
Cooling apparatus
Cooling apparatus comprises a vacuum chamber, an inner chamber positioned within the vacuum chamber adapted to contain a coolant for cooling target apparatus, and a mechanical refrigerator for...
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7281388 |
Apparatus to use a refrigerator in mobile computing device
An apparatus to use a refrigerator in a mobile computing device is described. In one embodiment, the refrigerator includes a cold reservoir to absorb heat generated by a heat generating unit of the...
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7281383 |
Reciprocating four-stroke Brayton refrigerator or heat engine
A thermal machine that can function as either a refrigerator or an external combustion heat engine is disclosed. A working gas undergoes four thermodynamic processes that comprise a Brayton cycle....
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7278271 |
Radial high energy acoustic device and the applied thermoacoutic device
A radial acoustic driver uses to generate higher amplitude of pressure fluctuation with radial type standing wave. The radial acoustic driver includes a cyclic type resonance tube which is filled...
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