Leaf valve hydraulic pulse drill bit short section

The utility model discloses a leaf valve hydraulic pulse drill bit short section, comprising a converting connector, a sliding valve, a sliding valve cylinder sleeve, a sliding valve spring, a piston cylinder sleeve, a piston, a piston spring, a positioning ring and a shell. The positioning ring, the piston spring, the piston, the piston cylinder sleeve, the sliding valve cylinder sleeve, the sliding valve spring and the sliding valve are orderly arranged in the inner part of the shell from bottom to top. The flow channel of the center of the sliding valve is closed by a bulkhead provided at the upper end of the piston, the converting connector is connected with the shell, the lower end surface of the converting connector is connected with the upper end surface of the sliding valve, and the lower end of the shell is connected with a drill head. Through the feedback of the differential pressure displacement of the piston and the sliding valve, the sliding valve and the piston are moved to and fro under the combined action of the inertial force of the surge pressure and the elastic force of the spring. The flow of the drilling fluid is blocked periodically. A high surge pressure which is downward transmitted into the well bottom is generated in the flow channel, and a hydraulic pulse with high amplitude and high peak value is formed. The hydraulic pulse can strength the clean-up effect of the well bottom, and the efficiencies of the jet rock-breaking drilling and the auxiliary rock-breaking drilling are improved.