SU594432A1 - Device for measuring liquid media viscosity - Google Patents

Description

one

This invention relates to viscometers for liquid media. A known viscometer containing a sampling vessel, a device for introducing an air bubble into the vessel, an optical device for detecting two predetermined positions of the bubble, and a device for automatically measuring the time required to move the air bubble between two positions in the test liquid l. This viscometer does not provide continuous measurement.

The closest technical solution to the invention is a device for continuous measurement of the viscosity of liquids, consisting of a measuring chamber, a measuring transducer with an input and compensation chambers, soy; E; The device does not provide sufficient accuracy of the measured 2 |.

The aim of the invention is to improve the accuracy of the method. “Vyyzs viscosity measurements.

This is achieved by the fact that the 1T ieme {the industry camera is made in the form of a pneumotube connected through a choke with a comisational camera, and a sabzheya device to maintain

section of the gas-test medium, made in the form of a pressure switch connected to the inlet and outlet gas valves.

The drawing is a diagram of the proposed device.

A device for measuring the viscosity of liquid bodies includes a measuring chamber in the form of a pneumatic tube 1 connected to a sensor of pneumatic impulses consisting of an electromagnet 2 and syphon 3, and with a measuring converter consisting of droplets 4, bellows 5 with contacts 6 and 7 and a compensation chamber 8; a device for maintaining the gas-test medium interface formed, for example: measures in the form of the surface of a gas bubble at the plug end of tube 1, consisting of inlet 9 and outlet 10 valves, reservoir. 11, bellows 12 with contact in 13 and 14; the control unit 15 for turning ON and OFF the electromagnet 2 and for the time 16.

In the original region, on the measuring pot calico; Brovai O1 of the PvE tube 1 of the medium immersed in the exploration of the 1st medium, a gas bubble of radius Ikj is formed, the electromagnet 2 is disconnected, the sylph is 3 stretched, and the measuring sylphb

compressed, contacts b are closed and control unit 15 sends a signal to turn on time meter 16. Under the influence of hydrostatic pressure exceeding the gas pressure in the measuring tube, the bubble is compressed, reducing the volume of the device and increasing the gas pressure in it. When the radius of a gas bubble is R, the pressure increases so much that it is strong. background 5, expanded, contacts open 6, ..

As a result, control unit 15 will turn off time meter 16 and turn on electromagnet 2. Bellows 3 will compress and cause gas pressure in the working volume of the device. The measuring BELLOW under the action of this pneumatic tension pulse will close the contacts 7. The control unit 15 will turn on the time meter again. The gas bubble under the action of a pneumo-impulse will begin to expand, increasing from a boom of radius S. to a volume of radius B. –j, thereby increasing the working volume of the device. The gas pressure in the working volume decreases and with a bubble radius equal to 82 s, the measuring BELLOW 5, shrinking, opens the contacts T. After that, the control unit 15 turns off the time meter 16 and the electromagnet 2, the bellows 3 stretches: and the gas pressure in the working volume of the device goes down The measuring BELLOW 5. under the action of this pneumatic impulse will compress and close contact 6. After which the control unit 15 will turn on the time meter. 16 and the viscosity measurement cycle is repeated. During the Cycle, the measurement of a gas bubble at the end of the measuring tube changes in size from radius R to radius Hd back. The rate of deformation of a gas bubble R t depends on the viscosity of the medium under study and / and the pressure difference acting on its surface P. At the same time from the cycle to the cycle of the pressure difference, the time it takes to move the surface of the bubble, and the duration of the cycles is determined by the viscosity of the medium studied 16 To reduce the effect of the statistical variation of cycle durations on the measurement result at the output, an integration unit can be installed in a time meter. . ,

The pressure difference acting on the surface of a gas bubble is achieved by using a device for stabilizing the gas-expansion medium interface. During operation of the device, the gas pressure in the working Volume varies cyclically between the pressure P - DT. and .P. In the compensation volume associated with the working volume iepea throttle 4, a pressure is established approximately equal to the average gas pressure P in the working volume Bellows 12 under the action of the pressure difference P in the compensation volume and Rd Above the surface of the medium under study that contacts 13 and 14 are open and valves 9 and 10 are closed. If you change this difference | for example, a decrease in pressure above the surface of the test medium or an increase in the temperature of the gas in tube 1, and therefore an increase in pressure in the working and compensation volumes of the device, the bellows 12, expanding, closes the contacts 13 and the excess gas is released from the device through the discharge valve 10. With a decrease in pressure ratios, ex. measures due to an increase in the external pressure or a decrease in the internal pressure due to a decrease in the gas temperature in the device volumes or gas leakage through leaks, bellows 12, compressing, closes the contacts 14 and through the valve 9 the gas from the reservoir 11 is injected into the device The difference is between the internal and external pressures, and at a stable level of the test medium, the average volume of the gas bubble at the end of the tube remains constant. .

In the case of using a device for measuring viscosity on objects with a variable liquid level, the adaptation of stabilizing the gas-test medium interface is used, where instead of the bellows an additional tube is connected to the compensation chamber and lowered into the test medium and fitted with a level sensor. In this case, for any changes in gas pressure in the working and compensation volumes of the device (from fluctuations in the level of the test medium, temperature, external pressure), the level of the test medium in the additional tube changes and the level sensor activates which turns on the corresponding valve 9 or 10 for intake or gas release.

Claims (1)

1. The patent of England No. 1210804, cl. GIS 1970. 2, USSR Author's Certificate 493704, cl. G 1 N 11/00, 1972.