The structure of the ejector drill bit is basically the same as that of the deep hole drill with internal chip removal. The difference is that the drill rod connected to the drill bit 

uses a double-layer tube, as shown in the figure. When working, the cutting fluid is input between the inner and outer drill tubes at a certain pressure, of which 2/3 of the 

cutting fluid flows to the cutting area through several small holes on the drill bit to cool and lubricate the cutting part and guide part of the drill bit, and then discharges 

from the inner tube with the chips. The other 1/3 of the cutting fluid is sprayed backward into the inner drill tube through the nozzle (crescent-shaped small groove) on the 

inner drill tube. Due to the increase in flow rate, a low-pressure area is formed by the jet effect, which extends to the chip removal channel of the drill bit. In this way, the 

chips are sucked into the inner drill tube along with the cutting fluid and are quickly discharged.

The ejector drill is very similar to the general deep hole drill with internal chip removal in appearance. The main difference is that there is an inner drill tube. The function of 

the inner drill tube is mainly to use the crescent-shaped nozzle at the end of the drill tube to form a low-pressure area in the inner drill tube, produce an ejector effect, and 

promote the smooth discharge of chips.