Tail-pipe-free high-air-pressure high-speed down-hole hammer sleeve assembly and spring applied by same

The utility model provides a tail-pipe-free high-air-pressure high-speed down-hole hammer sleeve assembly which comprises an outer cylinder and a spring installed in the outer cylinder. The diameter of the spring is gradually increased from the middle to the two ends, the outer diameter of the transition ring is 2-5 mm larger than that of the middle ring, the gap between the transition ring and the inner wall of the outer barrel is smaller than or equal to 0.2 mm, and the gap between the middle ring and the inner wall of the outer barrel is larger than or equal to 1.5 mm. By reducing the outer diameter of the middle ring of the spring and controlling the assembly clearances between the two ends of the spring and the outer cylinder, the spring cannot interfere with the inner wall of the outer cylinder of the impactor after being bent, so that spring breakage caused by friction is avoided, the wear resistance of the spring is improved, and the service life is prolonged to the maximum extent. 本发明创造提供了无尾管高风压高速潜孔冲