Abstract A solenoid drive linear motor actuates bellows which creates pressure pulses traveling in a connecting tube to a cylinder in which a free displacer is located. A pneumatic volume at one end of the cylinder is raised to an average cycle pressure. The pressure pulses propagate through the body of the free displacer to the cold volume end which is to be placed in contact with an element to be cooled and cause the free displacer to be reciprocated in the cylinder resulting in net cooling at the cold volume end. Because the working volume is sealed and the volume changes occur by forces applied to the bellows by the linear drive motor, no contaminants can enter thereby making the instant device a non-contaminating system. The invention described herein may be manufactured, used, and licensed by or for the Government for governmental purposes without the payment to me of any royalty thereon.
A cyrogenic cooler device comprising: a housing having a cooling end and a pneumatic volume end; a free displacer piston means positioned in said housing isolating said cooling end from said pneumatic volume end and capable of recriprocating motion therein; compressor means including bellows means communicating with said housing for producing pressure pulses in a working gas in said housing in response to a motive force reciprocating said bellows means and causing said free displacer piston means to reciprocate in response to said pressure pulses, whereby net work is extracted from said working gas resulting in cooling.
Claim 2
Dependent Claim
97 words
A cyrogenic cooler device comprising: a housing having a cooling end and a pneumatic volume end; a free displacer piston means positioned in said housing isolating said cooling end from said pneumatic volume end and capable of recriprocating motion therein; compressor means including bellows means communicating with said housing for producing pressure pulses in a working gas in said housing in response to a motive force reciprocating said bellows means and causing said free displacer piston means to reciprocate in response to said pressure pulses, whereby net work is extracted from said working gas resulting in cooling.
Claim 3
Dependent Claim
39 words
A cooling device according to claim 1 wherein said free displacer piston means is hollow and open at its end adjacent said cooling end and having passageway means adjacent the pneumatic volume end for communication with said compressor means.
Claim 4
Dependent Claim
47 words
A cooling device according to claim 2 including controlled leakage sealing means between said pneumatic volume and said passageway means whereby an average cycle pressure is created in said pneumatic volume; said leakage being slow in relation to the cycle time of the reciprocating free displacer means.
Claim 5
Dependent Claim
28 words
A cooling device according to claim 3 wherein said hollow free displacer means contains stainless steel mesh therein permitting said free displacer means to function as a regenerator.
Claim 6
Dependent Claim
58 words
A cooling device according to claim 4 wherein said free-displacer piston means and said bellows means are joined by conduit means and form an isolated volume and contain a working gas therein and wherein said motive force is generated by a solenoid drive linear motor reciprocating the bellows means thereby producing the pressure pulses in said working gas.
Claim 7
Dependent Claim
40 words
A cooling device according to claim 5 wherein said bellows means and linear motor aRe sealed in enclosure means and said enclosure means are filled with a gas thereby reducing the pressure differential to which said bellows means are subjected.