SU715973A1 - Screw conveyer-type viscosimeter - Google Patents

Description

(54) PIEKOV VISKOSIMETER

The invention relates to devices for the study of fluid properties and can be used to determine the viscosity of liquid media, in particular in the production of polyester, polyamide fibers in the chemical industry,

A well-known flow capillary viscometer of non-aggressive action, with a constant flow rate applied by means of a pumping device, which measures the viscosity of the flow pressure at the inlet and outlet of the capillary tube 11.

Also known is a flow capillary viscometer (2, comprising a housing in which there are capillaries with inlet and outlet, a bleed device, pressure and temperature sensors, a compensation and recording device.

The principle of operation of known viscometers is that the measured substance is supplied through the capillary by a pumping device. The differential pressure signal, which is proportional to the viscosity, is measured by pressure transducers.

A disadvantage of the known flow capillary viscometers is the need to select the test liquid with its subsequent pumping through a capillary tube at a constant flow rate. This is due to the presence of additional equipment, for example, the flow rate: vessels, heating valves,

0 high precision metering pumps, etc. In addition, the disadvantage of the known viscometers is the presence of capillaries in the viscometer housing, which often become idle due to crystallization of, for example, polymers as they pass through the capillary orifice. At temperatures below about 150 ° C, synthetic polymers are transferred to the solid phase, therefore, for capillary viscometers, heating is necessary for the entire system of flow of the analyte.

The closest technical

Claims (3)

5, the proposed invention is a screw viscometer 31, comprising a housing forming a chamber with inlet and outlet openings and with a pumping screw device placed in it &m; A sensor with a pressure sensor of the thermal circuit, and a retreat device. The principle of operation of the screw meter is based on balancing the flow rate of the flow meter by creating a single screw device 1 in the chambers with the pressure of the liquid in the measuring device. Such a viscometer is more reliable in operation as compared with the known flow-capillary viscometers, but it is inferior in measurement accuracy because part of the flow energy of the test liquid passes into heat, as a result of which the viscosity of the test liquid decreases. Moreover, a common drawback of the known viscometers is the need to thermofacten the whole measuring system. The aim of the invention is to improve the measurement accuracy. (:) It is detected that the screw viscometer contains a body forming a chamber with inlets and outlets and with a pumping screw placed in it, equipped with a drive, a pressure sensor and a pet-HCTPHpyraisee device additionally equipped with a camera that communicates with the main the camera, and the date dicky pressure; . The drawing shows the proposed / viscometer. - --- Auger viscometer Contains case 1, on tOTOpc are located chamber 2 with inlet 3 and outlet 4, and an additional chamber 5 with outlet fe. Chamber 2 is equipped with a pumping device 7 in the form of a screw, connected to a synchronous drive 8. Camera 2 is connected to an additional camera 5 via nozzle 9. Pressure sensor 10 is installed in chamber 5, and an additional pressure compensation sensor 11 is installed on the core 1 . To measure the temperature of the test medium, the viscometer is equipped with a temperature sensor 12. - The screw viscometer operates as follows. The liquid flows through the inlet 3 into the chamber 2.0 by means of the screw device 7 and the pipe 9 is pumped into the executive caravan 5 and out through the hole 6. Since the rotational speed of the screw device 7 is constant, the change in the speed of the screw is created. additional chamber 5, depends on: Changes in the viscosity of the investigated liquid. The pressure change signal in the additional chamber 5 from the pressure sensor 10, the pressure change directly in the process stream of the test liquid (from changes in the level and other disturbing WHO actions) from the additional compensation sensor 11 and the temperature change of the test liquid from the sensor 12 are converted by the appropriate compensation algorithm into a unified signal proportional to the viscosity of the liquid under study in a measuring unit (not shown in the drawing) and recorded by special devices ohm (not shown). The advanced screw viscometer improves measurement accuracy by using it to continuously measure the viscosity of the test liquid directly in the melt process flow in industrial plants, and the addition of an additional compensation pressure sensor, additional chamber and temperature sensor allows you to take into account the pressure change, temperature and level inside technological apparatus. In addition, the installation of the proposed viscometer can be carried out in any; place height technological equipment. The proposed screw-viscometer design is simple and reliable in operation, since there is no need for thermostatic control, which also improves the measurement accuracy and allows the viscometer to be used to measure viscosity up to 10,000 P and at a temperature of 350 in process apparatus heights. up to 25 m. Formula of the invention: Screw viscometer, comprising a housing forming a chamber with inlet and outlet openings and with a pumping screw device placed therein, a CTSOM associated with the drive, a pressure sensor and a recording device, about l and h In order to improve the accuracy of measurement, it is equipped with an additional camera, which communicates with the main camera, and a pressure compensation sensor. Sources of information taken into account during the examination 1. Kurase K. Keisho, 1969, 4 46-51. 2. US patent number 3277694, CL.73-55, 1965. 3.Uessen und Regeln in derchemischen Technik, iCransgeben von I engstenberg (B.Sturm) O.Winkur, Zweite Aurlage, Springer-rVeiMag. Herein (Gottingen), Ileiduberg, 1964, 8.863 (prototype).