RU32606U1 - Device for measuring the flow rate - Google Patents

Description

DEVICE FOR MEASURING FLOW SPEED

The technical solution relates to measuring equipment and can be used for operational speed control and metering of fluid flow in open channels and gravity gravity pipelines.

A device for determining the flow rate in the form of a deep float containing two parts connected by a thread: the upper (surface) supporting the float and the lower (deep) float, which controls the immersion depth using the connecting thread 1.

The disadvantage of a deep float is that its use requires large distances, and in narrow streams (trays and pipes) the measurement of speed by the float is complicated by the fact that the float touches the walls of the pipe, as a result of which the speeds are underestimated.

Closest to the proposed technical solution is a hydrometric pinwheel containing a blade screw, a housing equipped with a running gear, a counting-contact mechanism, connected via a terminal to a wire leading to a power source, an audio or light signal and a shorting wire to the mass terminal, forming, thus Thus, the electric circuit, in addition, the body of the turntable is equipped with a rod with a sighting device 2.

However, at shallow depths (less than 130 mm) it is impossible to use hydrometric turntables to determine the speed, since the rotor diameter of the turntable type RG is 120 mm. In addition, a significant drawback is the increased sensitivity to shock. It is practically impossible to use a spinner in a stream of industrial stormwater drainage, as well as in waters containing oil products, since each measurement requires increased attention to the readings of the instruments: stopwatch, sound signal, visual control, and position of the spinner

 ° ° ° G01 rZ / 50

especially in the lower dark part of the well, and in winter visibility is difficult or completely absent due to strong vaporization.

The objective of the proposed device is to increase the efficiency of the production of hydraulic measurements in the stream, industrial storm water drainage systems and drainage at any time of the year.

This goal is achieved by the fact that in the device comprising a housing with a running gear, a counting-contact mechanism, a tubular rod, the housing is equipped with a tube made of a material that freely transmits a magnetic field, rigidly fixed by means of plates, inside of which reed switches are installed at a distance of at least 45 mm from each other moreover, a float with a magnet is installed on the tube with the possibility of longitudinal movement, the tubular rod is equipped with a trigger mechanism containing a frame with limit stops, which is rigidly connected by a rod with g with a thrust freely moving in the guide, fixed in the housing, equipped with a protective casing, and an electronic millisecond meter connected to the electric circuit by wires coming from the reed switches is used as a fixing device.

In FIG. 1 (general view) and FIG. 2 (rear view with the protective cover removed) shows a schematic diagram of a device for measuring flow rate. On Fig.3 shows a diagram of the trigger mechanism.

The device consists of a housing (1), a tubular rod (2), a removable protective cover (3), a tube (4), a float with a magnet (5), plates (6), two reed switches (7), wires (8), a trigger mechanism (9), containing a frame (10) with limit stops (11), a rod with a flexible rod (12), a guide (13), a fixing device - milliseconds (14).

The device operates as follows.

The device with the help of a tubular rod (2) is lowered into the stream and set in its direction. A removable protective cover (3) protects the tube (4) from impacts, and serves as a stop for the device when measuring bottom velocities. The trigger mechanism (9) with the help of a rod (12) connected to a flexible rod and with stop bolts (11) rises upward in the guide (13) and releases the float with a magnet (5), which starts to move with the flow velocity. At the very beginning of its movement, a float with a magnet (5) includes the first reed switch (7), and the last closes the millisecond meter switching network (14).

At the end of its movement, the float closes the contacts of the second reed switch, which turns off the millisecond. The time of movement of the float t is displayed on the board. The distance between the reed switches L, called the basis, is accurately measured (at least 45 mm to increase the accuracy of the measured characteristics). When the distance between the reed switches is less than 45 mm, errors in the measurement of speed increase significantly.

The ratio of the path length L to time t gives the local speed V m / s.

It takes 3 ... 4 s to produce one measurement with the indication taken. For subsequent measurement (recharging), it is necessary to rotate the device 180 degrees and repeat the measurement operations indicated above. For optimal averaging of local speeds, 3 ... 6 measurements are made and the arithmetic average is determined.

The fixing device - millisecond is powered by the built-in power supply.

The introduction of reed switches controlled by a magnetic field in electrical circuits made it possible to close on-off circuits with the speed that the float with a magnet develops, and also automatically record the transit time of the basis by the float, which is displayed on the millisecond display.

Thus, the device implements the idea of using electronic stopwatch, which allows you to turn the time counter on and off with an interval of up to hundredths of a second.

The device was tested in the hydraulic laboratory of Omsk State Agrarian University for calibration and production tests at the pilot production hydrological and hydrogeological hospital of the Department of Hydrogeology, Hydraulics and Engineering Hydrology.

A device for measuring flow rates is simple in design, contains few dynamic elements, is reliable in operation, has high reliability of results, and can be used in land reclamation, water supply, sewage and drainage systems, including in harsh environmental conditions and in winter.

Sources used in the application process.

1.Zheleznyakov G.V. Hydrometry, M., Kolos, 1972, (pp. 76 ... 91).

2.Zheleznyakov G.V., Negovskaya T.A., Ovcharov E.E. Hydrology, hydrometry

and runoff regulation. M., Kolos, 1984, (pp. 57 ... 63), (prototype).

Claims (1)

A device for measuring the flow velocity, comprising a housing with a running gear, a counting-contact mechanism, a tubular rod, characterized in that the housing is equipped with a tube made of a material that freely transmits a magnetic field, rigidly fixed by means of plates, inside of which reed switches are installed at a distance of at least 45 mm from each other from a friend, moreover, a magnet float is installed on the tube with the possibility of longitudinal movement, the tubular rod is equipped with a trigger mechanism, and an electronic millis is used as a fixing device kundomer.