RU101816U1 - DEVICE FOR DETERMINING WATER CONSUMPTION IN WATER SUPPLY AND WATER DISCHARGE SYSTEMS - Google Patents

Abstract

 A device for determining the flow rate of water in water supply and sanitation systems, characterized in that it comprises a shield valve installed in an open channel that divides the channel into upper and lower downstream holes, the valve consists of a fixed shield and a movable control shield having a reflective plate fixed to it, and two level gauges, one of which is installed at a distance of not less than 1.0 m from the shield gate and serves to determine the water level in the upper pool of the channel, the other is mounted on a flat moving hour and a control board, which moves in a plane along the side guides fixed part, wherein between the movable and stationary parts of the regulating board, and also between the movable portion and the side rails mounted elastic seal, wherein the flow rate is determined by the following formula: Q = 2.953Cbh1.5 + Qig + Qig,! where Q is the water flow through the spillway, taking into account leaks; ! C is the flow coefficient; ! b - nominal value of the spillway width equal to 2.3 m; ! h - head, m; ! Qгщ - leakage rate through a horizontal gap between the fixed and movable shutter shields; ! Qvsh - flow rate of leakage through the lateral vertical slots (left and right).

Description

The utility model is designed to determine the flow rate of water when controlling the distribution and use of water in water supply and sanitation systems, during operational monitoring in open channels of various types and purposes. The use of this utility model in the field of wastewater disinfection for determining the flow rate in pressureless channels equipped with ultraviolet disinfection complexes for treated effluents is highly relevant. A known system of ultraviolet disinfection of water, which contains, among other systems, a system for maintaining the water level, including an adjustable electric shutter switch and an ultrasonic level sensor (RU 74908 U1, 07.20.2008). The disadvantage of this system is an approximate, rough estimate of the water flow, as a result of which the necessary degree of disinfection of wastewater is not provided. The technical result achieved by the claimed utility model is to increase the accuracy of determining the flow rate of water, which will allow more efficient implementation of the process of ultraviolet disinfection of wastewater. The essence of the utility model, as a technical solution, lies in the fact that the device for determining the flow rate of water in water supply and sanitation systems includes a shield valve installed in an open channel that divides the channel into upper and lower pools. The shutter consists of a fixed shield and a movable control shield having a reflective plate rigidly fixed on it, and two level gauges, one of which is installed at a distance of not less than 1.0 m from the shield shutter and serves to determine the water level in the upper channel of the channel, the other mounted on a flat movable part of the control panel, which moves in the side rails along the flat stationary part, and between the movable and fixed parts of the control panel, as well as between the movable part and side guides E elastic sealing installed, the water flow rate is determined by the following formula:

Q = 2,953Cbh1,5 + Qsh + Qsh

where: Q - water flow through the spillway, taking into account leaks;

C is the flow coefficient;

b - nominal value of the spillway width equal to 2.3 m;

h - head (m);

Qгщ - leakage rate through a horizontal gap between the fixed and movable shutter shields;

Qvsh - flow rate of leakage through the lateral vertical slots (left and right).

The device is illustrated by the figure of the drawing, which shows a general view of the device, where 1, 2 are level meters, for example, of the type The Probe, 3 is a reflective plate, 4 is a fixed shutter shield, 5 is a movable control shutter shield, 6 is a channel.

The device operates as follows. The shield shutter divides the channel into upper and lower concretes and its function is to stabilize the water level in the upper concourse of the channel, since the pressure on the spillway changes from the flow rate of water entering the upper concourse. To stabilize the water level in the upper bayef of the channel, the shutter has a movable control shield, with the help of which the overflow head changes depending on the flow rate of water entering the upper bayef. To determine the position of the water level in the upper bay there is a level gauge 1 installed at a distance of not less than 1.0 m from the shield shutter (the specified distance depends on the type of level gauge and ensures the accuracy of measurements of each installed level gauge). The position of the movable control shield is determined using a level gauge 2, which measures the level of the reflective plate, rigidly mounted on the movable shield. The values of H1 and H2, which determine the position of the level gauges, are constant and are measured from the same base when mounting the level gauges. The flat movable part of the control panel 5 moves in the side rails along the flat stationary part (not shown in the drawing). Between the movable and fixed parts of the shutter, as well as between the movable part and the side walls, elastic seals are installed to minimize fluid leakage, as the presence of leaks leads to the fact that the actual flow rate through the movable control shield is somewhat larger.

The water flow through the spillway in the channel is determined by the following formula:

Q = 2,953Сbh1,5 + Qгщ + Qвщ

where: Q - water flow through the spillway, taking into account leaks;

C is the flow coefficient;

b - nominal value of the spillway width equal to 2.3 m;

h - head (m);

Qgsh is the leakage rate through the horizontal gap between the fixed and movable shutter shields, which is determined by the formula:

Qmg = 4.43 εφ ab (H0-H3) 0.5

where: ε - the compression ratio of a flat jet (has a value of 0.611),

φ - speed coefficient (has a value of 0.95),

a, b are the values of the transverse and longitudinal dimensions of the horizontal gap (m), respectively

Н0 - is determined by the set point in the system for automatically maintaining the water level in the upper pool,

H3 - the amount of leakage between the fixed and moving shutter shields.

Qvsh - flow rate of leakage through the lateral vertical slots (left and right), is determined by the formula:

Qtw = 2,953 εφ (ad + an) (H0-H3) 1.5

where: ad, an are the values of the transverse dimension of the left and right lateral cracks.

Using the proposed utility model will improve the accuracy of determining water flow in open channels of any type and purpose, as well as use measurement data for technological and commercial water metering.

Claims (1)

A device for determining the flow rate of water in water supply and sanitation systems, characterized in that it comprises a shield valve installed in an open channel that divides the channel into upper and lower downstream holes, the valve consists of a fixed shield and a movable control shield having a reflective plate fixed to it, and two level gauges, one of which is installed at a distance of not less than 1.0 m from the shield gate and serves to determine the water level in the upper pool of the channel, the other is mounted on a flat moving hour and a control board, which moves in a plane along the side guides fixed part, wherein between the movable and stationary parts of the regulating board, and also between the movable portion and the side rails mounted elastic seal, wherein the flow rate is determined by the following formula: Q = 2,953Cbh1,5 + Qshh + Qshh, where Q is the water flow through the spillway, taking into account leaks; C is the flow coefficient; b - nominal value of the spillway width equal to 2.3 m; h - head, m; Qгщ - leakage rate through a horizontal gap between the fixed and movable shutter shields; Qvsh - flow rate of leakage through the lateral vertical slots (left and right).