SU823866A1 - Liquid flow rate measuring device - Google Patents

Description

one

 The invention relates to a device, in particular, to a device intended to measure the flow of a fluid by passing it in a continuous flow through a vessel whose volume is known.

A device for measuring the flow rate of a liquid is known, comprising a cylindrical measuring vessel with constrictions, limiting its measuring volume, level gauges and measuring the flow time of the flow rate l.

A disadvantage of this device is low accuracy and reliability.

The closest in technical essence to the present invention is a device for measuring fluid flow, comprising a cylindrical vessel with two constrictions limiting its measured volume, two level gauges installed in the region of constrictions, and a measuring instrument of fluid flow time I.

A disadvantage of this device is the occurrence of additional errors due to oscillations or other disturbances of the surface of the liquid, as well as malfunctions of the device due to the appearance of gas bubbles or

air in the working area of the level sensors.

The purpose of the invention is to improve the accuracy and reliability of measurements.

This goal is achieved by the fact that in the area of each narrowing of a cylindrical vessel at least two additional level gauges are installed symmetrically, and electric pulse extenders by the number of gauge-indicators and two level diagrams are inserted into the device. connected to one extension of the body of electrical pulses, the outputs of which are connected to two circuits AND with the number of inputs corresponding to the number of level sensors-indicators in each narrowing, and the outputs of the AND 0 circuits Nena with meter time of fluid flow.

Claims (2)

FIG. 1 schematically shows a device for measuring the flow rate of a liquid / in fig. 2 is a time chart of the device operation for cases of small disturbances of the liquid surface; in FIG. 3 is a timing diagram of the operation of the device i for cases of disturbances exceeding the permissible value. The device contains a cylindrical vessel 1, in which there are two disks with Jacques and limiting the volume and creating constrictions, c. which fluid level can be most accurately recorded. In the area of narrowing, gauges of level 3, 4, 5, 6, 7, 8, 9, and 10 are installed, the outputs of which are connected to expanders of electric pulses 11, 12, 13, 14, 15, 16, 17. and 18. Expanders related to the upper taper sensors are connected to the same I-19 circuit, and expanders related to the lower compressors are connected to the second and 20 diagrams. Both circuits are connected to the liquid flow time meter 21. The device operates as follows o6 at once. . . (Before the measurement starts, the level of the liquid in the vessel is set by Bbttue of the level sensor sensors-C. During the outflow of the liquid from the measuring vessel, when its level reaches the position of the level 3B sensor sensors, the last expressions are: The place of fluid oscillation or other reasons for its surface, the signals from the sensors are received at the entrance to the expanders by pulses 11–14, made on the rainbow multivibrate or not, simultaneously. The latter produce the same signals of a certain predetermined duration, which are fed to a four-way circuit AND 19 4 Signal flow; through the circuit AND and, accordingly, the inclusion of the liquid flow time meter is determined by the time interval between the leading edges of the first and pre-last pulses / coming from the sensors 3-6, as well as the length of the pulses set by extensions 11-14. . Two cases of device operation are possible. Fluid surface perturbations are absent or they are acceptable. For this case, the time difference between the signals received from the C-B sensor-indicators does not exceed the duration of the pulses produced by the expanders 11-14. The operation of the device is illustrated by the time diagram shown in FIG. 2. On axis x 1-4, it shows the pulses coming from the level sensors located at the upper constriction and determining the origin of the flow time of the fluid. On axis x 5-8, signals are generated / generated by expanders, ymyuls. Axis 9 shows the signal at the output of the four-input circuit AND, supplied to start the flow meter time. The presence of this signal (and a similar end-of-time sigal of liquid) indicates that the perturbations of the liquid surface do not exceed a predetermined value and the additional time error is less than the duration of the pulses produced by the expanders. The perturbations of the surface of the liquid exceed the permissible value, determined by the duration of the pulses produced by the expanders. This case illustrates the time diagram of FIG. 3. The start-up pulse of the liquid flow time meter does not mean that the video demonstrates that in addition, and the error exceeds the allowable one, and the flow time measurement is not carried out. can. . The proposed device virtually eliminates the simple triggers of the time meter for the flow rate of the liquid, SV Izainnye - air bubbles OR gas in the working area of the indicator sensors, since such an operation can occur only if air bubbles get into; The working clearances of all four sensors A are a difference in time not exceeding the duration of the pulse produced by the expander. The probability of such a hit is close to zero. The proposed device allows cjhuecTBeHHo to improve the accuracy of measuring the flow rate of a liquid, eliminating the errors associated with the disturbance of its surface during the outflow of fluid From. volumetric volume., Formula of the invention: A device for measuring fluid flow, comprising a cylindrical vessel with two constrictions, limiting its measured volume, two level gauges installed in the region of the constriction, and a time meter for fluid flow, This is due to the fact that, in order to increase the accuracy and reliability of measurements, at least two additional level gauges are symmetrically installed in the area of each constriction of a cylindrical vessel, and optical signal expanders are inserted into the device according to the number of indicator-indicators and two circuits AND, for this, each level indicator sensor is connected to one extension of electric pulses, output ||; ь1 of which are connected to two circuits AND with the number of inputs corresponding to the number of indicator sensors in each narrowing, and the outputs cxeif And are connected to the meter of the flow rate of the fluid. Sources of information taken into account prm examination 1.Patent of France No. 1398916, cl. G 01 F, 1965. 2. The patent of Germany 1249547, cl. 42 е 22/02, 1967 (prototype). Fi. Fi.Z