Patent ID: 8202027

Claim:
A water treatment pad for a drilling tool, which is installed on a drilling surface of an object to be drilled when a hole is drilled in the object by using the rotating drill tool while machining water is supplied, said water treatment pad comprises: a substantially cylindrical pad body having a drain in a side surface thereof and mounted in a manner that surrounds the drilling tool; and a cylindrical diffuser ring detachably fixed in the pad body in a manner that surrounds the drilling tool to accelerate a fluid therein and release the fluid to the outside, wherein the diffuser ring, which comes into contact with the drilling surface, has on the end surface of convex-shaped blades of which the transverse cross section has an airfoil profile tilting in the rotative direction of the drilling tool are arranged in an aligned fashion, and a plane defined by a distance between the adjacent blades and the heights of blades have a relationship in terms of an area (S 1 ) on an inner surface side of the diffuser ring and an area (S 2 ) on an outer surface side of the diffuser ring is S 1 <S 2 .