SU1434263A1 - Device for periodic measurement of liquid flow rate - Google Patents

Abstract

This invention relates to the measurement of the flow rates of liquids in chemical engineering. Mountain industry and allows to increase reliability. The liquid from the tank 15 through the pipeline 16 enters the working chambers 2 and 3, which have diaphragms 1 with hard centers 4, which are interconnected by a rod 5 with the transducer 9, Inter, installed on it, and the chambers 6 are connected to each other. valve 7 with the actuator 8 and the control system 10 connected to the transducer of the position 9. The interconnection of the chambers with each other by the valve and then the pipeline 17 through the restriction device 18 makes it possible to increase the reliability of the measurement of the flow rate by ensuring Eren and when. disconnect the power supply to the control system 10 and measurement system 11, as well as ensure the calibration of the converting device. 1 il.

Description

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11434263

The invention relates to gauges for expenditures W; identities, n can be used in the chemical industry, in particular, in the photographic industry.

The purpose of the invention is to increase the reliability of measurement of fluid flow.

The drawing shows a device for measuring fluid flow.

The device for measuring fluid flow contains two diaphragms 1, which form two working chambers 2 and 3 in the instrument case. Diaphragms 1 rest on rigid centers 4 interconnected by a rod 5. Chambers 2 and 3 are connected by pipeline 6 through the locking valve 7 to the actuating mechanism 8 The rod 5 is connected with the converter 9, its position relative to the chambers 2 and 3. The converter 9 is connected with the control system 10.

 a valve 7 and a flow measurement system 11 including a rod 12 moving speed meter 12, a memory unit 13 and a measuring device. 14. A 12 speed meter is output connected to the memory unit 13. Block 13

 liquid on unclosed rigid centers 4 parts of the surface of the diaphragm.

After the device is put into operation, the valve 7 is closed by the system 10.

10 controls the converter 9 signal that the rod 5 is in this MOMeitT in the middle position. After the valve 7 is closed, the pressure in chamber 3 remains unchanged: it is supported by transferring pressure into chamber 3 from chamber 2 through diaphragms 1, rigid centers 4 and rod 5. Therefore, the flow rate through the constriction device 18 does not change. in chamber 3 is reduced, and the rod moves from left to right.

In gauge 12, the speed of movement of the rod is measured, depending on its design, either the time it takes for the rod to travel at a set distance, or the magnitude of the movement of the rod 5 at a set time interval. The output signal of the meter 12 is stored in block 13 and received with the measuring device 14 is not on the measuring device 14.

masks of the memorized signal. After the passage of the rod 5, a device for measuring the flow distance of the fixed fluid is connected to the source of the converter 9, or through a projectile fluid, with a capacity of 15 and a tube of the established interval of time 15, which is fixed In the meter 12, with the chamber 2. From the chamber 3 consumed by the control system 10 is fed a comman-liquid flows through the pipeline 17 and the restriction device 18 from the chamber 3 to the consumer.

A device for measuring fluid flow 40 operates as follows.

In the open state, when the flow measurement device is disconnected, a normally open valve 7 does not prevent the flow of shadness from the tank 15 ДЗ under the action of hydrostatic or additionally generated pressure of compressed gas P through pipeline 16 to chamber 2 and further along pipeline 6 through valve 7, chamber 3, piping .Q water 17 and a constriction device 18 to the consumer. Since the hydraulic resistance of the restriction device 18 is several orders of magnitude greater than i. the remaining hydraulic resistance is terminated. When the circuit is used, the pressure in the chambers 2 of the flow meter as an element in the system and 3 with the valve 7 open is the same as the automatic control. The rod 5 with the open valve 7 flow rate even a temporary shutdown takes a steady average position of the flow meter from the power sources

yes to valve opening, 7. The stem, due to the pressure created by the pressure of the liquid on the parts of the diaphragms 1 that are not closed by rigid centers, returns to the middle position. During the movement of the rod 5 to the middle position, the pressure in the chamber 3 does not change and the flow rate is not suppressed. After the stem 5 has returned to the middle position, the valve 7 is closed and the cycle is repeated.

The main advantages of a device for measuring the flow rate of a liquid compared with the dispensing of its dispensers are shown in reliability when measuring flow rates up to 10 l / h. When the metering unit is out of service, the technological flow of the first object to the object is complete with respect to chambers 2 and 3. The forces that ensure the stability of the average position of the rod 5 are created by the pressure of the liquid on the 4 parts of the diaphragm surface not closed by rigid centers.

After the device is put into operation, the valve 7 is closed by the system 10.

controlling the signal from the converter 9 that the rod 5 is in this MOMeitT is in the middle position. After the valve 7 is closed, the pressure in chamber 3 remains unchanged: it is maintained by transferring pressure into chamber 3 from chamber 2 through diaphragms 1, rigid centers 4 and rod 5. Therefore, the flow rate through the restriction device 18 does not change. chamber 3 is reduced and the stem moves from left to right.

In gauge 12, the speed of movement of the rod is measured, depending on its design, either the time it takes for the rod to travel at a set distance, or the magnitude of the movement of the rod 5 at a fixed time interval. The output signal of the meter 12 is memorized in block 13 and the offset distance recorded by the converter 9, or after a set time interval fixed in meter 12 by the control system 10, is sent to the control panel.

is terminated. When using a flow meter as an element in an automatic flow control system, even a temporary shutdown of the flow meter from power sources

yes to valve opening, 7. The stem, due to the pressure created by the pressure of the liquid on the parts of the diaphragms 1 that are not closed by rigid centers, returns to the middle position. During the movement of the rod 5 to the middle position, the pressure in the chamber 3 does not change and the flow rate is not suppressed. After the stem 5 has returned to the middle position, the valve 7 is closed and the cycle is repeated.

The main advantages of a device for measuring the flow rate of a liquid compared with the dispensing of its dispensers are shown in reliability when measuring flow rates up to 10 l / h. When a metering unit is out of service, the supply of technological liquid to the first object (electricity and compressed air) does not lead to the cessation of liquid supply to the consumer — it continues to flow through the restriction device.

The simplicity of the actuator, consisting of only one valve, distinguishes the proposed flow meter from dispensers.

Claims (1)

Invention Formula A device for periodically measuring fluid flow, containing two diaphragms connected by a brush, about two working chambers, pipelines, valve with an actuator connected to the control system, a stem position transmitter connected to the control system and the flow measurement system, characterized in that, in order to improve the reliability of flow measurement, into it; a tapering device is inserted through which the output of the second working chamber communicates with the consumer, and the output of the first working chamber is connected to the second input through a valve.