本文报导由该大学研制成的一台小冷量活塞式无阀膨胀机型低温制冷机。膨胀机借助于通气口来运转,因而就删掉了必备的阀门。借助于一只能升、降压的贮器去掉了一组通常用来驱动活塞的曲柄连杆机构。膨胀机也可以借助于贮器中维持适当的压力来自行运转。使用10大气压的中压空气就可获得低温。同时还陈述了该低温制冷机与低温热泵循环制冷机的性能比较。 This paper reports the development of a small cold piston-type valveless expander-type cryogenic refrigerator developed by the university. The expander is operated by means of a vent, thus eliminating the need for an essential valve. A set of crank-and-rod mechanisms, usually used to drive pistons, is removed by means of an ascending and descending reservoir. The expander can also run by itself with the proper pressure in the reservoir. Use 10 atmospheres of medium pressure air for low temperatures. The performance comparison between the cryogenic refrigerator and the cryogenic heat pump cycle refrigerator is also described.