RU1813139C - Vacuum water-drawdown plant - Google Patents

Abstract

Usage: lowering the level of groundwater in construction. SUMMARY OF THE INVENTION: the apparatus comprises a suction manifold with needle filters, an air separation chamber with a float air valve, kinematically connected centrifugal and vacuum pumps connected to the chamber. An additional float valve is placed in the chamber, the suction nozzle of the centrifugal pump is made in the form of an elbow entering the chamber with a seat located at its end, with which the additional valve contacts. 1 ill.

Description

ate

WITH

The invention relates to a means of vacuum lowering the level of groundwater during the excavation of pits under the building.

The purpose of the invention is to reduce energy consumption and increase reliability.

The drawing shows a diagram of the device.

The vacuum dewatering installation comprises a centrifugal pump 1, a kinematically associated vacuum pump 2, an air separation chamber 3, a float air valve 4, an elbow 5, a float valve 6, a manifold 7, and needle filters 8.

Installation works as follows.

Before starting, the air valve 4 is in the lower position and isolates the air separation chamber from the atmosphere, the additional valve 6 is also in the lower position, blocking the inlet of the elbow 5 and separating the chamber 3 from the centrifugal pump 1. After turning on the drive motor, the vacuum pump starts suck air from the air separation chamber 3, creating a vacuum in it, under the influence of which water from the soil flows into the chamber. The water level in the chamber rises to the position - at which the force pressing the valve 6 against the seat becomes equal to the Archimedean force, with a further increase in the level of the C5 fluid, the float of the valve 6 floats, while the suction port of the elbow 5 opens and water enters the centrifugal pump.

Due to the fact that the capacity of the vacuum pump is greater than the productivity

centrifugal, after opening valve 6, the water level in the chamber will increase for some time until the air valve 4 connecting the air separation chamber to the atmosphere opens, after which the vacuum pump is switched to idle and the centrifugal pump to working. In this case, the water level in the vacuum chamber decreases to position I-I, the air valve 4 sits on the seat, connecting the vacuum pump to work, and after a while. due to the inertia of the system, valve 6 sits on the saddle, switching the centrifugal pump to idle mode.

The installed motor power for driving both pumps is determined based on the power during operation of one of the pumps plus the idle power of the other pump, which is less than the total

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Claims (1)

power of two engines, determined by the working load of each pump. SUMMARY OF THE INVENTION A vacuum water compression unit including a suction manifold with needle filters, an air separation chamber with a float air valve, kinematically connected centrifugal and vacuum pumps connected to the chamber, characterized in that, in order to reduce energy consumption and increase reliability, it is equipped with a size . an additional float valve in the chamber, and the suction nozzle of the centrifugal pump is made in the form of an elbow entering the air separation chamber with a seat located at its end, with which the additional valve contacts.