SU127831A1 - Measuring instrument of speed, parameters of pulsations and direction of flow - Google Patents

Description

The invention relates to devices for measuring the speed and parameters of pulsations, as well as determining the direction of flow of a fluid flow, based on measuring the potential between electrodes, one of which changes its position relative to the other under the action of the velocity head of the fluid flow.

The known electrolytic baths for electrically modeled and measuring the electrical parameters of a particular medium are complex and cumbersome, requiring careful measurements and adjustments. The described device consists of a three-electrode sensor and a supply measuring instrument. The device provides fast measurements in laboratory and field conditions and allows determining with a high accuracy the main parameters of the fluid flow with their registration on the switch instrument or with their observation on the screen of the electron-beam tube.

Schematically described the device shown in the drawing.

The device sensor is a tube, at the lower end of which two fixed electrodes / and 2 and one movable electrode 3, made in the form of a blade and located with two fixed electrodes, are fixed. The sub electrode may be with different stiffness of its suspension on the axis of rotation, depending on the magnitude of the flow velocity.

The sensor is included in the electrical circuit of the power-measuring unit with the formation of a liquid potentiometer, similar to a simulating electrolytic bath, in which the movable electrode plays the role of a probe or motor. The power supply metering box contains a step-down transformer 4, a voltage divider 5 with resistance to resistance 6, a polarized relay 7 (working as a rectifier), a null-galvanometer 8 with a pull 9. As follows from the circuit diagram of the device, tension 1e from transformer 4 Post No. 127831-2 falls on a voltage divider, which is connected to the sensor. The coil of the neutralized relay is also connected in parallel, and the null-alvanometer is included in the diagonal of the circuit to compare the potentials between the electrodes.

The operation of the device is as follows. A three-electrode cable is placed in a liquid. In a stationary fluid, the movable electrode is strictly midway between the stationary electrodes, and when the sensor is turned on in an electrical circuit, the galvanometer indicates 0. The sensor is immersed in a stream of moving fluid so that the movable electrode is at the desired measurement point, and until the count by the voltage divider and the reichord is maximum. This will indicate that the movable electrode is set perpendicular to the direction of flow of the fluid. This determines the movement of the fluid flow, which can be located on the rotary base of the sensor with the help of a limb and an arrow.

The moving electrode 3 of the sensor, moving between the stationary electrodes 1 and 2 under the action of the velocity head of the fluid flow, changes its electric potential. The latter is changed by the voltage divider and the reocord is proportional to the deviation of the electrode 3 and is observed in the grades graduated in units of speed (for the voltage divider in meters, and for the rheochord in centimeters and millimeters).

Since the operation of the device is based on measuring the potential in percentage terms, neither the temperature nor the electrical conductivity of the liquid makes an error in the measurement.W / does not contribute.

By including a device sensor in an electrical circuit with an oscilloscope, you can monitor or record the frequency and amplitude of the pulsations of the fluid flow with greater accuracy.

Subject invention

A speed meter, parameters of pulsations and flow direction, containing two sliding and one movable electrodes, which is characterized by the fact that, in order to record the speed, direction and magnitude of the pulsations of the water flow, the movable electrode, made in the form of a blade, is located between two stationary, which is energized, and when deflected by the flow, is at a potential varying in proportion to the magnitude of this deviation.