SU163378A1 - - Google Patents

Description

The known methods of checking and calibrating flow meters consist of passing a constant rate of fluid through a pointless flow meter and measuring its quantity. Devices based on these methods are cumbersome, expensive, and are discrete and have a long calibration time.

The proposed method and device can improve the accuracy of verification, eliminate discreteness, reduce the time spent on calibration, and determine the variation of readings.

FIG. 1 is a diagram illustrating the proposed method; in fig. 2 - the error curve when changing the flow rate of the fluid according to a sinusoidal law.

The proposed method of calibration and calibration of flow meters consists in the fact that the flow rate of a fluid through the flow meter being varied is changed according to a predetermined law, for example, a sinusoidal one. In this case, the flow takes all values from zero to a maximum in one cycle, which ensures the verification of all points of the scale in the shortest time.

The measuring device 1 of a rotating flow meter is connected via a pipeline 2 to a cylinder 3, in which piston 4 is moved with a rod 5. The rod through the connecting rod 6 and liner 7 is connected with the pin 8 to the crank 8, which is rotated from the engine 9 through the gear 10. When the speed wheel rotates piston, and therefore.

the fluid filling the system varies sinusoidally. By selecting the diameter of the cylinder 5 and the speed of rotation of the crank 5 and fixing the position of the liner 7 at a certain distance from the axis of the crank, a change in the flow rate from zero to the upper limit value for a given flow meter is achieved. to zero as shown in FIG. 2.6.

To measure and record the error of the flow meter, the signal from its output device 11 is fed to the input of the device 12. The device 13, connected to the crank 8, produces a signal proportional to the actual value of the flow. This signal is also fed to the input of the device 12, showing and recording the difference between the incoming signals at its input. With an appropriate choice of the scales of the signals and the scale of the device 12, it records the absolute or reduced relative value of the error.

Recorder recording when moving the chart tape to one side has the form shown in FIG. 2, a. If the direction of movement of the chart tape is consistent with C; the direction of change in the rate of flow of fluid, i.e., so that as the speed increases, the diagram moves in one direction, and as it decreases, in another direction,

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