SU1110943A1 - Air lift - Google Patents

Abstract

ERLPFT containing lifting pipe with a mixer at the bottom. to which the suction pipe and the air duct are connected, characterized in that, in order to increase reliability by reducing the external and external pressure gradient, the riser pipe and the suction pipe are provided with branch pipes with safety valves located in the latter.

Description

B / c

about CO

four

CO The invention relates to pumping, in particular, to the construction of airlift, which has an extended lifting tube and suction pipe, and can be used in the mining industry. Known airlift, containing a lifting pipe with a suction pipe in the lower part and placed at certain intervals mixers 1. The disadvantage of such airlift is low reliability. The closest to the invention to the technical essence is an airlift containing a lifting pipe with a mixer in the lower part, to which the suction pipe and the air duct 2 are connected. The known airlift is characterized by low reliability due to the pressure gradient caused by the clogged pipes : its pressures. The purpose of the invention is to increase reliability by reducing the gradient of the external and internal pressures. The goal is achieved by the fact that in er; 1fte containing a lifting pipe with a mixer in the lower part, to which the suction pipe and the air pipe are connected, the lifting pipe and the suction pipe are provided with branch pipes. flap valves placed in the latter. The drawing schematically shows airlift longitudinal section. Air lift contains lift pipe 1 with a mixer 2 in the lower part, to which the suction pipe 3 and the air pipe 4 are connected. The lifting pipe 1 and the suction pipe 3 are equipped with nozzles 5, 6 and 7 with safety valves 8, 9 and 10 located in the latter . Airlift works as follows. Air is supplied to the mixer 2 via the air duct 4. When it enters the riser pipe 1, air rushes upwards, transporting fluid at this. The liquid, along with the inclusions of solid material, flows into the mixer through the suction pipe 3. When the suction pipe 3 is blocked with solid material, the pulp in the mixer stops. In this case, the lifting pipe 1 is blown out by the BO; with the spirit, in it and the suction pipe 3, it hits to the value determined by the hydraulic losses of air when moving in the lifting pipe 1, which is not significantly different from the atmospheric one. Under the action of the pressure difference inside and in the pipe, safety valves 8, 9 and 10, located on the lifting pipe 1 and the suction pipe 3, open. The surrounding water through the pipes 5, 6 and 7 enters the lifting pipe 1 and the suction pipe 3, fill them and align pressure on the pipe walls from the outside and inside and thus prevents them from squeezing. The number of nozzles 5, 6 and 7 with safety valves 8, 9 and 10 is determined by calculation, depending on the volume of the lifting pipe 1 and the suction pipe 3 and the required speed of filling them. The safety valves 8, 9 and 10 are adjusted to a certain difference and so on. due to the strength of the material, which prevents their operation on the entire field of possible modes of operation of the airlift. When deviating from normal modes, safety valves 1.1. 8 are triggered, passes, when the water is consumed, and are covered only when it reaches k (permissible pressure difference. Tact / giuatzpp can occur, for example, ir :; movement of a large piece of solid material in the suction pipe 3 when pressure drops above a piece of solid material as a result of slowing down its movement. Thus, safety valves can be activated automatically locally, eliminating emergency CHTyjiuiuo; at a particular airlift point and maintaining it thus airlift operation within the allowable, ie. e. ia.shchie pipes 5, 6 and 7 with the safety valves 8, 9 and 10, stabilize the hydraulic Kzhimy airlift operation and prevents the crude from defor.matsii that povplaet reliability airlift.

Claims (1)

Airlift, containing a lifting pipe with a mixer in the lower part, to which a suction pipe and duct are connected, characterized in that. in order to increase reliability by reducing the gradient of external and internal pressures, the riser pipe and the suction pipe are equipped with nozzles with safety valves located in the latter.