摘要:
A heat exchanger comprises a gas casing formed with a gas chamber filled with a refrigerant gas, and a heat exchanging unit received in the gas chamber of the gas casing. The heat exchanging unit has a plurality of regenerative plates each made of a material having a thermal conductivity and a heat capacity. The regenerative plates are positioned in face-to-face and thermally insulated relationships to one another with the surfaces being in substantially perpendicular to the center axis of the heat exchanging unit to define spaces each between the neighboring two regenerative plates. Each of the regenerative plates may be shaped in the symmetrical outline form with respect to its central point and smaller in size than the cross-sections of the gas chamber of the gas casing. Each of the regenerative plates has a plurality of airy holes formed therein. The airy holes of the regenerative plates and part of the spaces define in combination a plurality of inner gas flow passageways extending in substantially perpendicular relationship to the surfaces of the regenerative plates to allow the refrigerant gas to flow therethrough to effect a heat exchange between the regenerative plates and the refrigerant gas therethrough while the refrigerant gas is passing through the gas casing.The heat exchanger can have the loss in the heat conductivity lessened to enhance the efficiency of exchanging the heat energy between the gas and the regenerator as well as can be manufactured by hand without laborious tasks.
摘要:
A two stage Gifford-McMahon cryocooler having a low temperature stage for reaching approximately 10K, wherein the low temperature stage includes a passive magnetic heat regenerator selected from the group consisting of Er.sub.6 Ni.sub.2 Sn, Er.sub.6 Ni.sub.2 Pb, Er.sub.6 Ni.sub.2 (Sn.sub.0.75 Ga.sub.0.25), and Er.sub.9 Ni.sub.3 Sn comprising a mixture of Er.sub.3 Ni and Er.sub.6 Ni.sub.2 Sn in the microstructure.
摘要:
A Gifford-McMahon cryorefrigerator is modified by using opposed sub-displacers which are sinusoidally reciprocated in opposite directions with respect to one another such that the force vectors of inertia created by the movement of the sub-displacers are cancelled out. The cancelling out of the force vectors should substantiallly reduce adverse affects associated with displacer banging.
摘要:
A refrigerator comprises a cold accumulator, an expansion chamber, a movable member which is provided in the expansion chamber, and which can move to change the inside volume of the expansion chamber, a compressed operating gas which is introduced into the expansion chamber through the cold accumulator, the gas being expanded under the action of the movable member to generate cold, and being exhausted from the expansion chamber through the cold accumulator, an auxiliary expansion chamber which communicates with the expansion chamber through a narrow flow passage, and an auxiliary movable member which is associated with the movable member, and which can be provided in the auxiliary chamber to change the inside volume of the auxiliary expansion chamber.
摘要:
In a Stirling refrigerator, a regenerator has a low-temperature end and a high-temperature end. A plurality of protrusions, which thermally contact with the low-temperature end of the regenerator, are formed on a low-temperature heat exchanger. The low-temperature heat exchanger has a recess between the protrusions, and the recess forms a flowing groove through which a working gas flows. The regenerator may contain a mesh regenerator material.
摘要:
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 cylinder with each piston dividing the interior of its cylinder into upper and lower portions. A liquid piston interconnects the upper portions of the two power cylinders. First mechanically powered valves having two states control the flow of the working fluid of a heat transfer loop through the lower portions of each power cylinder. A second mechanically powered valve causes the first mechanically powered valve to change state so that movement of the power pistons in the pair of power cylinders is substantially 180.degree. out of phase.