Abstract The invention describes a device for building-up fluid pressure pulses comprising a cylinder with a piston which divides the cylinder cavity into a high-pressure chamber and low-pressure chamber of which the first one has a hole and is filled with fluid while the second one communicates with a vessel containing compressed gas which accelerates the piston and the latter strikes the fluid contained in the first chamber so that said fluid is discharged under pressure through a hole in the chamber. The piston is of a differential design and its step of a larger diameter is located at the side of the first chamber while the step of a smaller diameter is located at the side of the second chamber, the cylinder between the steps being divided by a partition which, together with the piston steps, forms two hydraulic chambers. One of these chambers, located at the side of the step of a smaller diameter is in constant communication with the pressure line while the second one, located at the side of the step of a larger diameter is put periodically in communication with the first hydraulic chamber and simultaneously with the pressure line, and also with the drain line.
A device for building-up fluid pressure pulses comprising a cylinder; a piston of a stepped design reciprocating in said cylinder and dividing its cavity into a high-pressure chamber and low-pressure chamber; a means for the supply of fluid into said high-pressure chamber; a compressed gas vessel communicating with said low-pressure chamber, the gas from which accelerates the piston in the cylinder towards the high-pressure chamber for striking the fluid contained in it, said chamber having a hole for discharging the fluid at the moment of the piston blow; a large-diameter step of said piston located at the side of the high-pressure chamber; a small-diameter step of said piston located at the side of the low-pressure chamber; a partition dividing said cylinder cavity between the steps of said piston and forming, together with these steps, two hydraulic chambers the first one of which at the side of the step of a smaller diameter is in constant communication with the pressure line while the second one located at the side of the step of a larger diameter is put periodically in communication with the first hydraulic chamber and simultaneously with the pressure line, as well as with the drain line.
Claim 2
Independent Claim
198 words
A device for building-up fluid pressure pulses comprising a cylinder; a piston of a stepped design reciprocating in said cylinder and dividing its cavity into a high-pressure chamber and low-pressure chamber; a means for the supply of fluid into said high-pressure chamber; a compressed gas vessel communicating with said low-pressure chamber, the gas from which accelerates the piston in the cylinder towards the high-pressure chamber for striking the fluid contained in it, said chamber having a hole for discharging the fluid at the moment of the piston blow; a large-diameter step of said piston located at the side of the high-pressure chamber; a small-diameter step of said piston located at the side of the low-pressure chamber; a partition dividing said cylinder cavity between the steps of said piston and forming, together with these steps, two hydraulic chambers the first one of which at the side of the step of a smaller diameter is in constant communication with the pressure line while the second one located at the side of the step of a larger diameter is put periodically in communication with the first hydraulic chamber and simultaneously with the pressure line, as well as with the drain line.