| 摘要 |
A device for the generation of pressure pulses, includes a cylinder ( 3 ), a piston that is displaceably arranged in the cylinder ( 3 ), a pressure fluid circuit with an inlet ( 6 ) into and an outlet ( 7 ) out of the cylinder ( 3 ) on one side of the piston ( 4 ), a shaft ( 18 ) connected to the piston ( 4 ), and a liquid-filled chamber ( 17 ). The shaft ( 18 ) is arranged to be displaced through said chamber ( 17 ) in connection to a displacement of the piston ( 4 ) in the cylinder ( 3 ). The device includes at least one valve member ( 22, 24, 29, 32 ) for an occasional interruption of a flow of liquid out of the chamber ( 17 ). |
