The invention discloses an integrated slit cold head of a U-shaped pulse tube refrigerating
machine and a manufacturing method. The cold head comprises two parts of a top cover and a lower
flange, wherein two cylindrical lug bosses protrude below a big lug boss of the top cover, outer diameters of the two cylindrical lug bosses are respectively equal to inner diameters of a cold regenerator and a pulse tube; the two lug bosses integrally
cut and penetrate through a slit in parallel horizontally and uniformly; through
insertion holes matched with the cylindrical lug bosses of the top cover are arranged on the lower
flange, a sealing groove and a location groove matched with the big lug boss of the top cover are
cut on the upper surface of the lower
flange, the lower flange, the cold regenerator and the pulse tube are hermetically welded to form an
assembly; the top cover and the lower flange not only can be connected by bolts to form a detachable split cold head, but also can be hermetically welded to form an integrated cold head. In the invention, the main functions of three parts of an efficient cold end
heat exchanger, a pulse tube cold end gas director and a cold regenerator cold end gas
distributor can be intensively realized in an integrated slit cold head structure, the overall performance of the U-shaped pulse tube refrigerating
machine is enhanced.