Outer sleeve for safety shell type injector

The utility model discloses an outer sleeve for a safety shell type injector. The outer sleeve comprises an outer sleeve body and a screw seat at the front end of the outer sleeve body, wherein 6-8 bulges are uniformly distributed on the outer circumferential surface of the screw seat; a clamping slot is formed between two adjacent bulges. A safety shell is separated from a needle pipe seat and is directly arranged on the screw seat of the injector outer sleeve, so that the uniformity of mounting positions of safety needles can be guaranteed, and the subsequent packaging of the injector is facilitated. According to the injector outer sleeve, the clamping slots are formed in the outer circumferential surface of the screw seat, so that the safety shell can be conveniently arranged on the screw seat, and the safety shell can be directly assembled with the injector outer sleeve; the uniformity of the mounting positions of the safety needles can be guaranteed; the whole mounting process is very simple; the probabi