SU414489A1 - - Google Patents

Description

one

The known devices for measuring the flow of water in open streams do not allow continuous automatic measurement of the average flow velocity, which makes it difficult to use them in automated systems.

In the proposed device, this drawback is eliminated due to the fact that the float and the speed sensor are located on a straight parallel to the inclined bars of the parallelogram, and the intersection point of this straight line with the line passing through the hinges of the frame to the fixed support is located at the bottom of the channel. The rods of the speed sensor and the float are made the same length equal to the distance from the bottom of the channel to the upper hinge on a fixed support. The speed sensor bar is fixed on the frame at a distance equal to 0.4 bar length from the point of its attachment to the fixed support.

Diagram of the device shown in the drawing.

Water flow is determined automatically by:

Q / -ycp

moreover, the flow Flohaf F is found with the aid of the functional potentiometer 1, and the average speed Ucp is defined as

growth point at a depth of about 0.4 N from the bottom of the sensor 2.

The values of the flow area and its average speed in the form of electrical signals are fed to a multiplying device 3, the output of which is proportional to the water flow.

In the absence of water in the channel, the float 4 is lowered to the bottom of the channel, and the rod 5 converts frames 6 and 7 with a counterweight 8 into a horizontal position, turning them in the hinges of the support post 9. At the same time, the rod 10, pivotally connected to frames 6 and 7, lowers the speed sensor 2 at the bottom of the channel.

At the same time, the electrical signals of the speed sensors and the flow ponidi have zero values.

At 11а..111Ч1 and jKjToica with a depth of Н, the position of the float 4 with the frames 6 and 7 and the content of the rod 10 with the sensor 2 change. The sensor 2 is always located above the bottom at a distance of 4 °.

The signal from the sensor is fed to the first input of the multiplying device 3. Potentiometer

1, mechanically connected to the frame 7, the track P1ei behind the water level by means of the float 4, generates a signal proportional to the flow area on the second input of the multiplying device 3, from where the multiplied signals

arrive at the secondary device 11.

3 Subject of the invention

Device for automatically measuring the water flow in an open channel, comprising a multiplier device, a frame associated with a potentiometer, is pivotally connected to support post, vertical pguapgn with a float sensor and flow rate sharnnrpo zakreple1gnye n frame forming two narallelogrlmmnye communication otlichayuHJ e Since, in order to increase the accuracy of the measurement, the non-floating point and the speed sensor are placed on a straight, parallel

four

inclined parallelogram rods, the intersection point of this straight line with the line passing through the hinges attaching the frame to the fixed support is located at the level of the bed channel; the speed sensor bars and the float are of the same length equal to the distance from the bottom of the channel to the upper link on the fixed support , and the speed sensor staple is fixed to the frame at a point, which is separated by an eppoy, for example, at a distance, with a rapp of 0.4 of the length of HiTanrn from the point of its fastening to the non-strung support.

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