When the working surface water inflow exceeds the capacity of the submersible pump, the sewage pump and the ordinary horizontal pump relay must be used in order to reduce the number of the movement of the horizontal pump, jet pump becomes an ideal intermediate drainage equipment.
Jet pump working principle, is the main drainage pump horizontal supply high-pressure water into the nozzle jet pump in, to negative pressure caused by high speed injection of the mixing chamber, the water can be in the working face with the atmospheric pressure and the mixing chamber of the pressure difference, along the suction pipe into the mixing chamber, the ceiling mixed flow with high velocity flow gained a lot of momentum, by extending device make the most of the kinetic energy dependent potential energy can be water discharged to a certain height of the water storage in, by the main drainage pump drained away.
Jet pump structure is more simple than the submersible pump, the general use of the yuan to weld steel pipe can be welded. According to the determination, roughly the same amount of drainage in the case of double nozzle head Yuekebi single nozzle of the pump is increased by L times.
Due to a jet pump structure is simple, easy fabrication; also accounts for the small size, easy maintenance, when shooting with iron cover suction hose and faucet can, also work reliable, inhalation of air and mud and sand, work as usual has been drained. Its disadvantage is to play a part of the recycling of water, so the efficiency of drainage is not high, the power consumption is also large. According to the statistical in inclined shaft, down the mountain construction due to the widespread use of jet pump drainage, a year can be driving less 2000 ~ 2500m auxiliary tunnel, the construction speed was increased by an average of about 25%; in high methane mine, on the waste processing of the auxiliary tunnel to a corresponding reduction in; similarly, by a reduction in the number of temporary water sump, in the future to reduce the hidden trouble of mine water also has the advantage. Therefore, in the construction of large water down the mountain, the jet pump with drainage, drainage is a kind of ideal.
