| 摘要 |
<p>The invention relates to plate freezers constituted by a pile of horizontal plates positioned inside an insulating chamber comprising on two opposite faces slots for loading products to be deep-frozen and unloading deep-frozen products, and screw jacks for displacing the pile of plates vertically and bringing each plate to the level of said slots successively. …<??>To ensure good lubrication of the jacks at low temperatures, each jack is constituted by a screw (40) connected to the framework of the freezer, this connection being designed to permit the rotation of the screw, a nut (46) fixed to one end of a tube (48) which is concentric with the screw and a tubular, fixed casing (54) which is concentric with the screw and with the tube and the bottom of which is traversed in a sealed manner by said tube, and the other end of said tube, from which there is suspended a platform bearing the plates, is closed, and said tube and said casing delimit a closed volume which forms an oil reserve and is connected in its upper part to an air expansion reservoir which is also closed. …<IMAGE>… </p> |
