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Refrigeration > Gas Compression, Heat Regeneration And Expansion, E.g., Stirling Cycle Gas Compression, Heat Regeneration And Expansion, E.g., Stirling CycleGas Compression, Heat Regeneration And Expansion, E.g., Stirling Cycle patent applications listed are from June 2005 to current and include Date, Patent Application Number, Patent Title, Patent Abstract summary and are linked to the corresponding patent application page.11/15/07 - 20070261419 - Folded cryocooler design A compact cryocooler includes a gas compression piston (304) supported for reciprocal linear translation along a first longitudinal axis (308) and a gas displacing piston (362) supported for reciprocal linear translation along a second longitudinal axis (366). The first longitudinal axis (308) and second longitudinal axis (366) are substantially orthogonal. ... 11/15/07 - 20070261418 - Miniaturized gas refrigeration device with two or more thermal regenerator sections The size of a miniature cryocooler (100) operating on the Stirling refrigeration cycle is further reduced by shortening a first thermal regenerator module (R) disposed on a cold side of a thermal barrier (T) and providing a second thermal regenerator module (R1) disposed on a warm side of the thermal ... 11/15/07 - 20070261417 - 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 (362) is moved over an expansion stroke range. The device includes a compression spring (622) disposed to bias the ... 11/15/07 - 20070261416 - Hybrid cryocooler with multiple passive stages A multi-stage cryocooler has three or more stages, including an active first stage and passive second and third stages. The active stage may include a Stirling expander, and the passive second and third stages may be pulse tube coolers. The cryocooler may provide cooling at three different temperatures. The coldest ... 11/08/07 - 20070256428 - Vibration control of free piston machines through frequency adjustment A method and apparatus for minimizing the amplitude of mechanical vibrations of a mechanical apparatus including a linear, freely reciprocating, prime mover coupled to and driving a reciprocating mass of a driven machine in reciprocation at a driving frequency. The coupled prime mover and driven machine have a spring applying ... 11/01/07 - 20070251245 - Refrigeration apparatus An outdoor heat exchanger (23), an indoor heat exchanger (24), a compression/expansion unit (30), and other circuit components are connected in a refrigerant circuit (20). The compression/expansion unit (30) includes a compression mechanism (50), an electric motor (45), and an expansion mechanism (60). In addition, the refrigerant circuit (20) has ... 10/25/07 - 20070245747 - Cooling box The controller of a cooling box is configured such that when the temperature of the warm head of a Stirling refrigerating machine exceeds a reference temperature, it maximizes the speed of a heat radiation fan and the output of a circulation pump, and minimizes the output of the Stirling refrigerating ... 10/04/07 - 20070227159 - Regenerator and cryogenics pump The invention has an object to provide a regenerator and cryogenics pump using a regenerator material which fulfils such requirements as specific heat, thermal conductivity, manufacturing easiness, strength, hardness, chemical stabilization and low cost instead of Pb which is environmentally harmful. In a regenerator 14 which contains regenerator material 16 ... 09/27/07 - 20070220903 - 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 3a sandwiched between a first high-temperature-side heat exchanger 4 and a first low-temperature-side heat exchanger 5 and a second stack 3b sandwiched ... 08/23/07 - 20070193281 - Thermoacoustic apparatus and thermoacoustic system In a thermoacoustic apparatus including a loop tube, a standing wave and a traveling wave are generated rapidly and, thereby, heat exchange is performed rapidly and efficiently. The thermoacoustic apparatus includes a first stack 3a sandwiched between a first high-temperature-side heat exchanger 4 and a first low-temperature-side heat exchanger 5 ... 07/19/07 - 20070163272 - 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 the first and second stages provides a good balance between the inefficiencies but compact size of a ... 07/12/07 - 20070157632 - 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 generating device; a pulse tube connected to the regenerator; and a phase control mechanism connected to the pulse tube; wherein a heat exchanger is ... 06/14/07 - 20070130961 - 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 magnetic shield surrounds the magnetic material. ... 05/31/07 - 20070119191 - 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 generating device; a pulse tube connected to the regenerator; a phase control mechanism connected to the pulse tube; and a heat exchanger provided at ... 05/31/07 - 20070119190 - 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 low temperature end of the cold storage device cartridge via a stage member; a phase adjusting mechanism ... 05/31/07 - 20070119189 - 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 high pressure ports to the pulse tubes located on a single track and two ... 05/31/07 - 20070119188 - Reduced torque valve for cryogenic refrigerator A rotary valve unit which reduces the torque required to turn the valve disc, and the amount of wear dust that is blown into the cold head, using differential gas forces to keep the valve disc in contact with the valve seat, and which enables larger diameter valve discs to ... 05/17/07 - 20070107442 - Wearless valve for cryorefrigerator An improved method of reducing wear dust and torque required to turn a multi-port rotary disc valve utilizes a thrust bearing to hold the valve seat and/or valve disc such that they are not in contact with each other, or have light contact each other. ... 05/10/07 - 20070101730 - Cold stocker In a cold stocker according to the present invention, a compartment-cooling heat exchanger is connected to a cold-side heat exchanger mounted to a cold section of a Stirling refrigerating engine so as to form a cold-side refrigerant circulation circuit. To a warm section of the Stirling refrigerating engine, a first ... 05/03/07 - 20070095074 - Acoustic cooling device with coldhead and resonant driver separated An acoustic cooling device is provided. A coldhead and an acoustic power source of the acoustic cooling device are separated by way of a long tube connecting them to enable the cold tip to be installed in a remote location where a traditional unitary system would not fit, would generate ... 05/03/07 - 20070095073 - Linear compressor controller A free-piston linear compressor (1) controlled to achieve high volumetric efficiency by a controller including an algorithm (116) for ramping up input power until piston-cylinder head collisions are detected using a detection algorithm (117/118) which then decrements power input whereupon input power is again ramped up by algorithm (116). Non-damaging ... 04/05/07 - 20070074522 - Cryogenic refrigerator including separating device A cryogenic refrigerator has a separating device provided between a lower temperature portion and a heat exchanger to selectively separate the lower temperature portion and the heat exchanger, and thus to selectively block heat transfer between the lower temperature portion and the heat exchanger. According to the cryogenic refrigerator, it ... 03/29/07 - 20070068175 - Control system for actively cooled cryogenic biological preservation unit A control system for an actively cooled cryogenic biological preservation unit wherein vapor flow into or out of the unit or a proxy thereof is sensed by a flow sensor signaling a controller which modulates cryocooler refrigeration into the unit. ... 03/15/07 - 20070056297 - Low vibration cryocooler Disclosed are a low vibration cryocooler and a method of reducing vibration in a cryocooler. The cryocooler can be a Stirling class cryocooler includes at least one motor that drives a mass, the motor having a main drive winding and a separate trim winding. A motor controller outputs a main ... 03/01/07 - 20070044484 - Pulse tube cooler having 1/4 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 wavelength of an acoustic wave in the working gas within the resonator tube at its operating frequency, temperature ... 02/15/07 - 20070033952 - 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 vessel interior by condensing cryogenic vapor boiled off of the pool of liquid cryogen with a cryocooler ... 02/08/07 - 20070028626 - Loop type thermo siphon, stirling cooling chamber, and cooling apparatus A loop thermosyphon includes a closed circuit configured of an evaporator, a condenser, a feed pope and a return pope, and the evaporator is an assembly including a header pipe associated with the feed pope, a header pipe associated with the return pipe, and a plurality of aligned pipes. Each ... 02/01/07 - 20070022759 - Dynamic system for refrigeration equipment It refers to the special features of this invention, which are a set of mechanisms, electro-mechanisms, and electronic controls that allow a compression chamber for a refrigeration fluid or other kinds of fluids to employ three, six, or even double that number of chambers. The equipment runs at an extremely ... 01/04/07 - 20070000258 - Biological refrigeration sytem A refrigeration system especially useful for refrigerating biological samples wherein a cryocooler, such as one employing a pressure wave from a pressure wave generator, is used to generate refrigeration for cooling liquid coolant or purging fluid, which is employed within hollow structures bordering an enclosed space of a storage unit ... 01/04/07 - 20070000257 - Pulse tube refrigerating machine To provide a pulse tube refrigerator for enhancing refrigeration capacity. A pulse tube refrigerator includes a pressure-waveform generating device 1 for generating a pressure waveform of refrigerant gas, pulse tubes 14, 20 into which refrigerant gas with pressure waveforms flow, one of whose ends is adapted to a low-temperature end, ... 12/28/06 - 20060288710 - 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 temperatures to a magnet assembly, a vacuum vessel surrounding the pressure vessel and a radiation shield spaced from the cryogen pressure vessel, and ... 12/14/06 - 20060277925 - Pulse tube refrigerator A pulse tube refrigerator that is small in size and free from vibration and electric noise. A pulse tube refrigerator (1) has a pulse tube, a cool storage unit connected to the low-temperature side of the pulse tube, a vibration generator connected to the high-temperature side of the cool storage ... 11/30/06 - 20060266052 - Passive thermoacoustic cooling apparatus A passive thermoacoustic cooling apparatus for cooling of components such as miniaturized microelectronics is disclosed. The passive thermoacoustic cooling apparatus includes resonant cavities, a temperature-difference element and a heat conduction element. The temperature-difference element is integrated with the system of resonant cavities for conversion of heat into acoustic power. The ... 11/23/06 - 20060260329 - Cryogenic biological preservation unit with integrated cryocooler and nitrogen supply A system for the cryogenic preservation of biological material having a dedicated cryocooler integrated with an insulated vessel and preferably a membrane separator which processes feed air for supplying gaseous nitrogen into the insulated vessel for condensation by refrigeration provided by the dedicated cryocooler. ... 11/23/06 - 20060260328 - Cryogenic biological preservation unit with active cooling and positive atmospheric seal lid A cryogenic biological preservation unit and method of operation wherein the atmosphere within the unit is sealed from the outside atmosphere by pressure maintenance provided by varying amounts of refrigeration from a cryocooler and by a sealed lid employing pliable polymeric material maintained in compression. ... 11/23/06 - 20060260327 - Apparatus and method for rapidly freezing small objects A desktop gas liquefaction system having a gas generator, a cooling unit having a stirling, pulse-tube or stirling-pulse-tube cooler, and an insulated container to receive the liquefied gas. Alternate embodiments may be used to produce 1-20 liters of liquid nitrogen, oxygen, argon, natural gas, or air per day. This compact ... 11/16/06 - 20060254286 - Solid state cryocooler A cryocooler is disclosed which includes a reservoir (11), an electrochemical cell or proton conductive membrane (PCM) compressor (12) coupled to a source of AC current, and a gas expander in the form of a pulse tube expander module (13). The compressor (12) includes a proton conductive membrane (17) positioned ... 11/02/06 - 20060242968 - Cooling device A cooling apparatus comprises a pulse tube refrigerator (A) having a pressure source (1), a cold reservoir (6), a condenser (7), a pulse tube (9), a radiator (1), and a phase adjuster (12); and a low-temperature container having a liquid reservoir (21) fixed to a vacuum tank (31) through heat-insulating ... 10/12/06 - 20060225435 - Cryocooler with grooved flow straightener A cryocooler system having at least one flow straightener which has a system of grooves on its perforated surface for enhancing gas flow uniformity through the system wherein pulsing gas which does not initially pass through the flow straightener through a perforation flows along the surface of the flow straightener ... 10/12/06 - 20060225434 - Cryocooler assembly with screened regenerator A cryocooler assembly having a regenerator employing a plurality of high heat capacity screens positioned perpendicular to the regenerator longitudinal axis and in a sufficient linear density to serve as heat transfer media and also to serve as buffer structures to keep worm holes within particulate heat transfer media from ... 10/12/06 - 20060225433 - 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 value representative of a second parameter of the cryogenic medium in the cooling system via a predefined physics based model. A ... 09/28/06 - 20060213207 - 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. Two of these processes, adiabatic compression and adiabatic expansion, take place in the same cylinder, within which a piston, driven ... 09/14/06 - 20060201163 - Heat-storing medium Normally granulates of rare earth compounds are used as a heat-storing medium for a low-temperature range below 15 Kelvin. The material costs for rare earths are high. Further, rare earths are magnetic and thus not suitable for all applications. The present heat-storing medium for a very low temperature range is ... 08/24/06 - 20060185370 - 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 respective ends of a stack combining a hot heat exchanger with a cold heat exchanger and a stack combining ... 08/17/06 - 20060179850 - Refrigerating machine using the stirling cycle A cooler machine using the Stirling cycle and comprising: at least one compressor (5) with a compressor piston (6) movable in a compression cylinder (7); a regenerator (8) with a regenerator piston (9) movable in a regeneration cylinder (10) placed at a given angle relative to the compression cylinder (7); ... 08/10/06 - 20060174635 - 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 by providing one or more of thermal bridges, and/or insulating sleeves between one or more pulse tubes and regenerators, ... 07/27/06 - 20060162346 - Stirling cycle beverage cooler The invention provides a heat exchanger operable, for example, with Stirling cooling system. The heat exchanger includes a first member having an inner surface defining a flow path for a working fluid. The first member also includes an outer surface spaced from the inner surface. The heat exchanger also includes ... 07/20/06 - 20060156741 - 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 regenerator also functions as an outer wall of the pulse tube. In another embodiment, there is an annular gap between an ... 07/20/06 - 20060156740 - 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 upper portion of the interior of the unit which also contains a pool of liquid cryogen and at least one ... 07/06/06 - 20060144054 - 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 2nd stage is co-axial but preferably, both stages are co-axial with the second stage pulse tube being central and the first stage pulse tube occupying the annular space between ... 07/06/06 - 20060144053 - 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 compressor for circulating a first refrigerant through a first circulation circuit having a cooling compartment evaporator. The high-temperature heat radiation portion is in ... 06/29/06 - 20060137362 - 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 with a working fluid inside, and a ring type electricity-acoustic energy transducer that is inside the cyclic type resonance tube ... 05/11/06 - 20060096301 - Nmr spectrometer with refrigerator cooling An NMR spectrometer comprising an NMR magnet system (27) disposed in a helium tank of a cryostat and an NMR probe head (11) disposed in a room temperature bore of the cryostat, which contains a cooled RF resonator (9) for receiving NMR signals from a sample to be investigated, and ... 05/04/06 - 20060090478 - Cryocooler operation with getter matrix A method for operating a cryocooler wherein some cryocooler working gas is diverted from the pressure wave pathway before passing to the cold portion of the cryocooler, passed to a getter for adsorptive cleaning of contaminants, and returned to the pressure wave pathway at a warm portion of the pressure ... 05/04/06 - 20060090477 - 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 compressed-gas supply line (18) between a compressed-gas source (20) and the compressed-gas accumulator (34). Further, the compressed-gas supply line (18) comprises an inlet valve ... 04/27/06 - 20060086098 - Pulse tube cooler with internal mems flow controller A regenerative refrigeration system includes one or more control devices that utilize micro electro mechanical systems (MEMS) technology. Such MEMS devices may be small in size, on a scale such that it can be introduced into a refrigeration system, such as a cryocooler, without appreciably affecting the size or mass ... 03/23/06 - 20060059921 - Miniature thermoacoustic cooler A MEMS based thermoacoustic cryo-cooler for thermal management of cryogenic electronic devices and a resonant tube used therein. A vertical comb-drive can provides an acoustic source through a driving plate to the resonant tube. By exciting a standing wave within the resonant tube, a temperature difference develops across a stack ... 03/09/06 - 20060048522 - Method and device for installing refrigerator A partition member partitions off a cooling stage of a refrigerator from a refrigerant container, containing a refrigerant gas condensed by the cooling stage, of a cooling system, and a low melting point metal held in the partition member brings the cooling stage into thermally contact with the refrigerant container. ... 03/09/06 - 20060048521 - 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, either by stamping or by laser beam irradiation. Thereafter, the resin film is stacked. ... 03/02/06 - 20060042272 - Refrigerator comprising a regenerator A refrigerator (1) has a housing (2, 14, 19), a cylindrical working chamber (15, 21), a cylindrical displacing member (11, 17), a gap (36, 38) which is located between the housing and the displacing member, a regenerator which is disposed inside the displacing member, and a device alternatingly supplying the ... 02/23/06 - 20060037327 - Temperature controlling unit and container using the same A temperature controlling subunit, which includes a Stirling refrigerator as a temperature controlling device, is attached to an insulative lid. A heat absorbing sink which constitutes a temperature control effect member of the temperature controlling subunit is thermally exposed at one surface side of the lid. The resultant structure functions ... 02/09/06 - 20060026968 - Cryopump with two-stage pulse tube refrigerator Disclosed is a two-stage pulse tube cryopump cooling system in which the pulse tubes and valves are inline, with the hot ends of the pulse tubes at the top and the valve mechanism is at the bottom and the hot ends and buffer volume are cooled by an inline coolant ... 12/15/05 - 20050274124 - 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 and the cold end of the second stage regenerator. The design of the invention is much simpler than ... 12/15/05 - 20050274123 - Thermoacoustic device A thermocoustic device includes a housing with a thermal core supported in the housing and having a first and a second surface. The thermal core includes a first heat exchanger defining the first surface of the thermal core and a second heat exchanger defining the second surface of the thermal ... 12/01/05 - 20050262851 - Magnetic field generating assembly A magnetic field generating assembly comprises a superconducting magnet located in a cryostat defining a bore accessible from outside the cryostat, and a mechanical refrigerator having at least two cooling stages for at least partly cooling the cryostat. A coolant path extends from the refrigerator into the magnet bore. The ... 11/24/05 - 20050257534 - Method for operating a cryocooler using on line contaminant monitoring A method for operating a cryocooler which provides opportunity for timely intervention prior to failure thus enhancing the reliability of the provision of the refrigeration wherein contaminant concentration downstream of a compressor but upstream of the cryocooler is monitored and the time rate of change of the contaminant concentration is ... 11/17/05 - 20050252219 - Superconductor technology-related device comprising a superconducting magnet and a cooling unit A superconducting magnet with at least one cooling agent-free superconducting coil is provided along with a cooling unit with at least one cold head. A conduit system, thermally coupling the coil to the cold head, includes at least one duct in which a cooling agent circulates according to a thermosyphon ... 10/20/05 - 20050229609 - Cooling apparatus Cooling apparatus comprises a cooling system defining a closed path around which a coolant flows. The system includes a pump for causing coolant flow, a supply line extending from the pump to a cold location, positioned in a cryostat, in order to cool that location, and a return line extending ... 10/20/05 - 20050229608 - Temperature control for free-piston cryocooler with gas bearings A cryocooler having two operating modes so that its operating range is broadened, its gas bearing system is maintained in an operable state and it can utilize piston stroke modulation for energy efficiency. A piston stroke modulator modulates the piston stroke when the commanded piston stroke exceeds the minimum stroke ... 10/13/05 - 20050223715 - Regenerator and cryocooler using the same A regenerator includes a casing including a connection channel for making a high temperature part and a cooling part communicate with each other; and a thermal energy storage material inserted in the connection channel of the casing and made of an aramid fiber which stores/radiates heat of a working fluid ... 10/13/05 - 20050223714 - Cryogenic temperature cool storage device 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 utilizing at least one magnetic material including a rare earth element and sulfur as the regenerator material. ... 10/06/05 - 20050217280 - 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 earth elements and one or more non-rare earth metals. ... 10/06/05 - 20050217279 - 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 is a thermoacoustic based refrigerator. In one embodiment, the refrigerator is a Stirling based refrigerator. ... 09/29/05 - 20050210889 - Method for operating a cryocooler using temperature trending monitoring A method for operating a cryocooler which provides opportunity for timely intervention prior to failure thus enhancing the reliability of the provision of the refrigeration wherein temperature trending of at least one cryocooler component or the refrigeration load is monitored and used to calculate a service time. ... 09/29/05 - 20050210888 - Cooling load enclosed in pulse tube cooler A cooling load 90 is enclosed within the envelope of the pressure vessel that contains the working fluid in a pulse tube cooler in a load space 95 adjacent to a regenerator 58 of that pulse tube cooler. Flow-smoothing means 63, which include stacked screens and perforated plates, or diffuser ... 09/29/05 - 20050210887 - Resonant linear motor driven cryocooler system A resonant linear motor driven cryocooler system, particularly suited for providing refrigeration to a magnetic resonance imaging system, wherein vibrations from the resonant linear motor and noise from pulsed gas are isolated from the cryocooler by work transfer piping comprising connecting tubing and preferably a dashpot, and wherein the connecting ... 09/29/05 - 20050210886 - Method for operating a pulse tube cryocooler system with mean pressure variations A method for operating a pulse tube cryocooler system wherein in the event the mean pressure of the working gas within the fixed volume of the cryocooler undergoes a change, the operation of the system is kept from severe degradation by changing the frequency of the pressure wave generator driving ... 09/29/05 - 20050210885 - Refrigeration system A refrigeration system comprising: a Stirling machine (1); a refrigerating chamber (4); a first thermal energy transfer device (2) operatively associated with a refrigerating portion (1b) of the machine and with the refrigerating chamber (4); a second thermal energy transfer device (3) operatively associated with a heat receiving means, external ... 09/15/05 - 20050198970 - Low frequency pulse tube system with oil-free drive A pulse tube system for generating refrigeration for uses such as in magnetic resonance imaging systems wherein an oil-free compressor operating at a higher frequency generates pulsing gas which undergoes a frequency reduction and drives the pulse tube system at a more efficient lower frequency. ... 08/11/05 - 20050172644 - Loop-type thermosiphon and stirling refrigerator A loop-type thermosiphon capable of stable operation regardless of fluctuation of heat load and a Stirling refrigerator using the same are provided. The loop-type thermosiphon transferring heat from a high-temperature heat source using a working fluid includes a evaporator having a heat absorption portion and evaporating the working fluid by ... 08/04/05 - 20050166604 - Stirling cooler Disclosed is a stirling cooler, in which a cylinder is fixedly installed in a case, a flange is protruded perpendicularly from an outer surface of the cylinder in a radial direction of the cylinder, a stair on which the flange is seated is installed in the case in an axial ... 08/04/05 - 20050166603 - 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 the inner stator is detachably inserted into a ring-shaped groove of the cylinder, thus ... 08/04/05 - 20050166602 - Stirling cooler and heat exchanger thereof Disclosed are a stirling cooler and a heat exchanger thereof. Since the heat exchanger includes an inner heat exchanger, installed in a heat exchange chamber provided between a case and a cylinder, including a main body having a ring shape contacting the case and the cylinder, and a plurality of ... 08/04/05 - 20050166601 - Portable insulated container incorporating stirling cooler refrigeration An insulated container is provided that utilizes Stirling cooler technology. The insulated container and the Stirling cooler may include a self-contained, portable power source. Controls are provided for operating the Stirling cooler. The controls may include a temperature sensor for a compartment of the insulated container, and a speed control ... 08/04/05 - 20050166600 - Superconducting magnet apparatus and maintenance method of refrigerator for the same A superconducting magnet apparatus includes superconducting coils in a vacuum vessel. The vacuum vessel is provided with a refrigerator for cooling the superconducting coils. The refrigerator includes a motor drive, displacers, and a cooling cylinder accommodating the displacers such that the displacers may reciprocate therein. The vacuum vessel has a ... 07/28/05 - 20050160744 - Superconducting device with a cold head of a refrigeration unit with a thermosyphon effect thermally coupled to a rotating superconducting winding The superconducting winding comprises a rotor which may rotate about a rotation axis with a superconducting winding in a thermally conducting winding support. The winding support comprises a central coolant cavity, with a lateral cavity leading out of the winding support connected thereto. A cold head of a refrigeration unit ... 07/21/05 - 20050155356 - Superconductive device comprising a refrigeration unit, equipped with a refrigeration head that is thermally coupled to a rotating superconductive winding The invention relates to a superconductive device containing a rotor that can be rotated about an axis of rotation and that comprises a superconductive winding in a winding support. Said winding support has a central cavity, into which two fixed thermal tubes project axially. One of said tubes forms a ... 06/16/05 - 20050126187 - Cryogenic cooling apparatus A cold head of a refrigerator is secured to a support stage provided separately from a cryostat so that the support stage supports the load of the cold head. On the other hand, a low-vibration stage for supporting a load of an object to be cooled is secured to a ... 06/16/05 - 20050126186 - Axial loaded seal system with a static l-seal A piston includes a circumferential groove having a dynamic split seal ring having a flat axially facing surface, a static seal ring having a flat axially facing surface abutting the flat surface of the dynamic seal ring, and a spring mounted within the groove. The spring exerts an axial force ... 06/09/05 - 20050120722 - Fin structure A fin structure for heat-exchanging, the fin structure being mounted on a heat-dissipating portion of a Stirling cycle cooler, wherein the fin structure is configured by coupling a plurality of unit structures, the plurality of unit structures being split by a plurality of surfaces extending from a inner circumference of ... 06/09/05 - 20050120721 - Cryocooler cold-end assembly apparatus and method A cryocooler cold end assembly is disclosed. The assembly includes a unitary external, outer housing. By constructing the housing from a single unitary metal shell, part count is reduced from prior art assemblies. Additionally, all brazing requirements previously necessary to secure and seal the components are eliminated. Further, due to ... 06/02/05 - 20050115247 - Fast warm up pulse tube This invention provides an improved means of quickly warming a pulse tube (165) by shifting the phase relation of flow to the warm end of the pulse tube relative to flow to the warm end (117) of the pulse tube relative to flow to the warm end of the regenerator ... ### FreshPatents.com Support |