Patent ID: 6864593

Claim:
A device for the generation of pressure pulses, being intended for transmitting signals, in a fluid-carrying channel, in particular a drill string for sinking a deep well, comprising a pulser designed to be placed in the channel and having a housing and an adjustable throttling device by means of which the flow resistance can be varied at least at one point of the channel, an electrical generator having a stator and a rotor, an impeller exposed to the fluid passing through the channel and designed to drive the rotor, a control device by means of which the load of the generator can be varied in response to control signals, and an actuating device that is connected to the throttling element and effects an adjustment of the throttling element responsively to the driving torque of the generator wherein the impeller is axially movably mounted and yieldingly supported against the direction of fluid flow such that the supporting force of the yielding support increases as the axial movement of the impeller increases, and wherein the throttling device includes an adjustable throttling element that is coupled to the impeller in such a way that the throttling element is adjusted in the sense of increasing the throttling effect by an axial movement of the impeller in the direction of fluid flow.