Patent ID: 8166992

Claim:
An operable fluid-injector, which is operable in combination with a body of ground and an injection-well located in the body of ground, wherein: the injection-well is so arranged as to conduct a flow of fluid down an in-ground pipe of the injection-well, and to inject the fluid therefrom out into the ground formation around the injection-well; the fluid-injector is located at the ground surface; the fluid-injector is effective, when operated, to increase the concentration of the injected fluid in groundwater in the formation around the injection-well; the fluid-injector includes a pulse-generator, for superimposing pulses onto the flow of fluid down the in-ground pipe; the pulse-generator is mounted at ground surface level; the pulse-generator includes a housing, in which is mounted an electric motor, having a rotating drive-shaft; the pulse-generator includes a rotor, which is drive-coupled to the drive-shaft, and a stator; the housing defines an upstream-chamber, which has an inlet-port for receiving fluid from a supply reservoir; the housing defines a downstream-chamber, which has an outlet-port for conveying fluid to the in-ground pipe; the housing includes a pulse-conduit, containing an openable and closable pulse-port; the pulse-conduit is structured for conveying fluid, when open, from the upstream-chamber to the downstream-chamber; the rotor is provided with a rotor-aperture, and the stator is provided with a stator-aperture; the rotor-aperture and the stator-aperture are so arranged that, as the rotor rotates, the rotor-aperture cyclically covers and uncovers the stator-aperture; the pulse-port of the pulse-conduit is fully open when the rotor-aperture fully overlies the stator-aperture, is partially open when a portion of the rotor-aperture overlies a portion of the stator-aperture, and is closed when no portion of the rotor-aperture overlies any portion of the stator-aperture; whereby, insofar as the upstream-chamber at a higher pressure than the downstream-chamber, and insofar as the motor rotates, a pulse comprising a pressurised pulse-volume of liquid passes from the upstream-chamber to the downstream-chamber, through the pulse-conduit, when the pulse-port is open.