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4727722 |
Rotary magnetic heat pump
A rotary magnetic heat pump constructed without flow seals or segmented rotor accomplishes recuperation and regeneration by using split flow paths. Heat exchange fluid pumped through heat...
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4724676 |
Heat exchange matrix for refrigeration apparatus
A cryogenic refrigeration apparatus comprises an electrically actuated compressor which supplies a working fluid to a free moving displacer which includes a regenerator matrix, so that a container...
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4722201 |
Acoustic cooling engine
An acoustic cooling engine with improved thermal performance and reduced internal losses comprises a compressible fluid contained in a resonant pressure vessel. The fluid has a substantial thermal...
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4717405 |
Stirling machine
A Stirling-cycle assembly comprises an engine with a displacer piston mounted in a cylinder and defining a compression compartment and an expansion compartment respectively of a gaseous working...
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4713939 |
Linear drive motor with symmetric magnetic fields for a cooling system
A cooling system has a compressor for producing cyclic pressure conditions within a refrigerator's system's volume. The compressor alternately increases and decreases the working volume, thus...
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4711650 |
Seal-less cryogenic expander
A cryogenic refrigerator operating on the Split-Sterling cycle principle is disclosed. The refrigerator has a seal-less expander and achieves efficient operation without the use of external control...
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4708165 |
High pressure stepped clearance seal valve in a cryogenic refrigeration system
In an expansion engine used in cryogenic refrigeration, a stepped inlet valve 10 and a stepped exhaust valve 11 are fluid activated to control high pressure gas such as helium into and out of the...
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4700545 |
Refrigerating system
A refrigerating system for generating low temperatures has one high-temperature region refrigerator sub-system and one low-temperature region refrigerator sub-system. The low-temperature region...
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4694650 |
Externally tuned vibration absorber
A vibration absorber unit or units are mounted on the exterior housing of a hydraulic drive system of the type that is powered from a pressure wave generated, e.g., by a Stirling engine. The...
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4693090 |
Thermally powered engine utilizing thermally powered valves
A thermally powered engine has a pair of power cylinders with each power cylinder defining a closed interior space. A power pistin is reciprocally mounted in the interior space of each power...
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4693736 |
Oil cooled hermetic compressor used for helium service
In a cryogenic refrigeration system, a hermetic refrigerant compressor pump is used to compress helium. The compressor pump 10 is oil cooled by a heat exchange jacket 46 surrounding a compressor...
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4683723 |
Heat activated heat pump
A heat pump has a hot displacer and a cold displacer disposed opposite to each other in a state wherein the two displacers are guided by two guide projections so as to form two gas springs,...
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4664685 |
Linear drive motor control in a cryogenic refrigerator
In a Stirling cryogenic refrigerator, the movement of the displacer is monitored by sensing the back EMF in the displacer drive coil throughout displacer stroke. The back EMF signal is applied...
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4642994 |
Magnetic refrigeration apparatus with heat pipes
A magnetic refrigerator operating in the 4 to 20 K range utilizes heat pipes to transfer heat to and from the magnetic material at the appropriate points during the material's movement. In one...
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4642995 |
Damped displacer refrigerating machine
A refrigerating machine having a displacer reciprocable in a hollow space having a substantially-closed end for the refrigerating operation has a spring between the displacer and the...
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4622823 |
Gas refrigerator
A refrigerator comprising a piston which is driven in a reciprocating fashion within a cylinder by the difference in pressure of working gas alternately supplied to first and second variable-volume...
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4620418 |
Stirling engine
A Stirling engine wherein a pressure variation is provided by a reciprocative movement of a displacer and is effected upon a power piston to obtain an output motive force. A first elastic film is...
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4619112 |
Stirling cycle machine
The design of a cryogenic regenerator for an isothermal Stirling cycle is based upon separately minimizing the losses due to the static heat mass regenerator material and the thermodynamic losses...
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4610143 |
Long life vibration canceller having a gas spring
A vibration balancing arrangement utilizing a counterbalance mass oscillating at a frequency near its resonant frequency. Resonance is obtained by a gas spring, in which the length of the...
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4606194 |
Cryocooler having low magnetic signature
A cryocooler 8 is described which has a low magnetic signature in which a ceramic displacer 10 reciprocates within a helium impenetrable cold finger cylinder 12. A cyrogenic refrigerator formed by...
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4584839 |
Multi-stage cryogenic refrigerators
First and second multi-stage cryogenic refrigerators each have a displacer driven by a common motor so that the displacers are substantially 180° out of phase. The final stage of each refrigerator...
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4584840 |
Cooling machine or heat pump
The cooling machine or heat pump has a thermoacoustic work system having a heat source and a heat sink coupled with at least one thermoacoustic drive system of like construction. The heat source of...
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4578956 |
Cryogenic refrigeration system with linear drive motors
In a cryogenic split Stirling refrigerator, the compressor and displacer are driven by linear drive motors. Each compressor linear drive motor has a plurality of radial permanent magnets 44, 46...
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4574591 |
Clearance seals and piston for cryogenic refrigerator compressors
A cermet piston 36 is positioned to reciprocate within a ceramic sleeve 58 of a cryogenic refrigerator 12. The sleeve 58 forms a very tight clearance seal 67 with the piston 36 yet is allowed to...
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4570445 |
Method of absorbing thermal energy at low temperature
The maximum pressure of a working medium is reduced to or below the critical pressure of the working medium, or the critical pressure of the working medium is selected to lie between the maximum...
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4569203 |
Cryogenic cooler
A thermal energy detecting system includes a closed cycle cooler (refrigerator) having a piston assembly including a piston, a piston housing and a preloaded spring mounted in the piston housing...
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4567726 |
Externally excited resonant free piston Stirling engine thermal amplifier system and method of operation and control therefor
An externally excited resonant free piston Stirling engine thermal amplifier system which is over damped at all load levels and will not freely oscillate and wherein the displacer/piston system of...
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4558570 |
Compressor unit in split cycle cryogenic coolers
A split cycle cryogenic cooler system of the Stirling split type comprises a compressor which is positioned in a sealed casing, the drive for the compressor being constituted by an electro-motor...
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4553398 |
Linear motor compressor with pressure stabilization ports for use in refrigeration systems
A pressure stabilization system for a linear compressor 20 piston 24 in which a check valve 68 and passages 72, 64 within the piston permit communication between a compressor work space and a...
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4550571 |
Balanced integral Stirling cryogenic refrigerator
In an integral Stirling cryogenic refrigerator the compressor piston is several times heavier than the displacer. In order to counterbalance both the displacer and compressor piston with a rotating...
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4546663 |
Drive linkage for Stirling cycle and other machines
An improved linkage which is advantageously used in linking the crank of a Stirling machine to its coaxially reciprocating pistons. A swing lever having at least three spaced pivot axes is...
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4543792 |
Refrigeration system with clearance seals
In a split Stirling refrigerator, the dynamic seals about the displacer are virtually dragless clearance seals. The displacer is driven by pressure differential between a working gas and a gas in a...
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4543793 |
Electronic control of cryogenic refrigerators
In a cryogenics refrigerator having a piston or piston-like displacer reciprocating in a cylinder, the position of the piston or displacer, the temperature at the cold end of the cylinder and/or a...
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4539818 |
Refrigerator with a clearance seal compressor
In a Stirling refrigeration system in which a displacer is driven in a reciprocating motion within a cold finger by a pressure differential between helium gas in the cold finger and helium gas in a...
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4538416 |
Method and apparatus for valve motor actuation of a displacer-expander refrigerator
A method and apparatus for producing refrigeration without loss of refrigeration or introduction of magnetic disturbance when using a displacer-expander type cryogenic refrigerator pneumatically...
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4534176 |
Linear resonance cryogenic cooler
The disclosure is a dual controlled linear resonance cryogenic cooler and comprised of a remote cold finger and a compressor, both driven by linear motors. A motor control means is used with the...
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4532771 |
Cooler made of aluminum for stirling engines
A cooler made of aluminum for use in Stirling engines comprises a multiplicity of cooling tubes, a pair of headers joined to opposite ends of the cooling tubes, inner fins provided in the interior...
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4532766 |
Stirling engine or heat pump having an improved seal
A Stirling Engine or Heat Pump having two relatively movable machine elements for power transmission purposes includes a hermetic seal bellows interposed between the elements for separating a...
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4528818 |
Sequencing means for Stirling cycle, Ericsson cycle or like apparatus
In Stirling Cycle or similar apparatus having a compressor (15, 15a), a cold finger (1) and a displacer (4) within the cold finger, sequencing between the compressor and the displacer is effected...
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4526008 |
Pneumatically controlled split cycle cooler
A pneumatically controlled split cycle cooler utilizes a dual piston compressor in conjunction with a remotely positioned head, the dual pistons are angularly spaced to provide in phase and out of...
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4524586 |
Cryogenic refrigerator
The cryogenic refrigerator includes a movable displacer within an enclosure having first and second chambers of variable volume. A refrigerant fluid is circulated in a fluid path between said...
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4522032 |
Stirling-cycle refrigerator
A Stirling-cycle refrigerator comprises a plurality of Stirling-cycle refrigerator units each having a displacer defining an expansion chamber, a piston defining a compression chamber, and a...
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4522033 |
Cryogenic refrigerator with gas spring loaded valve
In a cryogenic refrigerator, a valve member reciprocates to control fluid to and from chambers of variable volume. The valve member is moved in one direction by a cam and in the opposite direction...
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4520629 |
Drive mechanism for a refrigerator with clearance seals
An improved cryogenic refrigerator having a drive mechanism suitable for use with gap or clearance seals is disclosed. The drive mechanism includes two reciprocating members, e.g. piston and...
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4520630 |
Cryogenic refrigerator and heat source
The cryogenic refrigerator includes a movable displacer within an enclosure having first and second chambers of variable volume. A refrigerant fluid is circulated in a fluid path between said...
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4514979 |
Hot-gas piston type engine
An intermediate circuit is connected between the compression space acting as a first heat exchanger of the cylinder of a heat pump or a working machine and the water for industrial use or the...
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4514987 |
Passive automatic phase delay control of the displacer motion in pneumatically driven split cycle type cryocoolers
In order to control the passive motion of the pneumatically driven displacer in a cryogenic cooler system of the split cycle type, the refrigerant gas is forced to flow through a narrow passage...
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4512150 |
Constant temperature element
A constant temperature element for heating or cooling a working gas to the temperature of a control fluid is disclosed. The element includes a plurality of hollow concentric tapered rings of...
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4507927 |
Low-temperature magnetic refrigerator
The disclosure is directed to a low temperature 4 to 20 K. refrigeration apparatus and method utilizing a ring of magnetic material moving through a magnetic field. Heat exchange is accomplished in...
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4505119 |
Flexible linkage for the displacer assembly in cryogenic coolers
In split cycle cryogenic coolers the compression and the expansion stage are distinct from one another and are connected by gas conduits. The change of volume of the expansion chamber is obtained...
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