Spiral alloy drill bit

The invention discloses a spiral alloy drill bit which comprises a spiral rod body and a drill bit body arranged at one end of the spiral rod body, wherein a hard alloy layer is arranged on the edge part of the drill bit body; a joint for connecting drill rods is arranged at the other end of the screw rod body; a water through passage is arranged in the middle of the spiral rod body; the spiral rod body comprises a first rod body and a second rod body; and a flow blocking element is arranged in the water through passage. By arranging the flow blocking element, the response speed of the flow blocking element is high when water is cut off during drilling, and drilling slag and the like can be effectively prevented from entering a water through hole, and the situation that the water through passage is blocked due to drilling slag deposition can be avoided. 本发明公开了一种螺旋合金钻头，本发明包括螺旋杆体和设置在螺旋杆体一端的钻头本体，所述的钻头本体的刃部设置有硬质合金层，螺杆杆体的另一端设置有用于连接钻杆的接头，所述的螺旋杆体的中部设置有过水通道，且所述的螺旋杆体包括第一杆体和第二杆体，所述的过水通道内设置有阻流元件。本发明通过设置阻流元件，在钻探停水时，阻流元件的