GAS AND GAS-LIQUID INJECTION UNIT Russian patent published in 2010 - IPC F04B23/00 

FIELD: engines and pumps.

SUBSTANCE: proposed unit consists of several pump sections each incorporating work chamber with piston and rod articulated with con rod gear. Piston divides work chamber into head end and rod end. Note here that head end communicates with additional chamber furnished with delivery valve and inlet gas valve communicated via gas tube with self-contained gas source. Rod end communicates continuously with the same gas source that, in suction stroke, allows force brought about by gas pressure in said additional chamber and acting on piston to be balanced by force in rod end caused by identical pressure. For more complete pressure equalisation, check valve opening towards rod end and receiver are built in the line that communicates rod end with self-contained source. Receiver volume is selected so that rod end pressure at the end of suction stroke exceeds the pressure in self-contained gas source with relationship between active areas of head end rod ends. The conditions wherein, in suction stroke, catches up con rod gear, are eliminated.

EFFECT: ruling out of negative moment that causes extra dynamic loads and reduces life of pump parts.

3 dwg, 2 cl