JET DEVICE FOR ABRASIVE WORKING AND DEVICE FOR SUPPLYING POWER CARRIER TO IT Russian patent published in 1996 - IPC

FIELD: oil industry. SUBSTANCE: device consists of a nozzle whose outlet perforated part is received in the cavitation nozzle. Passageways for supplying abrasive and power carrier under high-pressure are connected with the nozzle. The passageway for low- pressure power carrier is connected with the cavitation nozzle for pumping the periphery layers of liquid that decelerates the central part of the jet out from the nozzle. The nozzle has diffuser and perforated cylindrical branch pipe. The branch pipe is mounted inside the diffuser and form a ring space. The space is coupled with the ambient. The space of the perforated cylindrical branch pipe is connected with the passageway for supplying abrasive and passageway for power carrier of high pressure. The device for supplying power carrier to the device has a sleeve with ports. The sleeve is interposed between the stop bushing and spring. The spring presses the stop bushing with respect to the differential piston. The top part of the piston is provided with a hollow for spring and sleeve. The bottom part of the piston is provided with passageways for connection of the space under the large stage of the piston with the high-pressure space through a check valve. The stop bushing form a ring space together with the housing. The ring space is connected to the space, passageway for power carrier, and the ambient. EFFECT: improved design. 3 cl, 2 dwg