SU798548A1

SU798548A1 - Viscosimeter

Info

Publication number: SU798548A1
Application number: SU792758498A
Authority: SU
Inventors: Михаил Васильевич Кулаков; Алексей Николаевич Дубовец; Бенгард Григорьевич Лях
Original assignee: Украинский Заочный Политехническийинститут
Priority date: 1979-04-26
Filing date: 1979-04-26
Publication date: 1981-01-23

Description

1one

Изобретение относитс к области исследовани физико-химических характеристик жидких сред и может быть использовано дл в зкости как ньютоновских , так и неньютоновских жидких сред, в том числе жидких сред с твердыми включени ми, содержащих частички различных размеров и формы, S химической , производства строительных материалов, -пищевой, горнообогатительной и других отрасл х промышленности .The invention relates to the field of studying the physicochemical characteristics of liquid media and can be used for the viscosity of both Newtonian and non-Newtonian liquids, including liquids with solid inclusions, containing particles of various sizes and shapes, S chemical, construction materials production. , food, mining and other industries of the industry.

Известен способ определени в зкости аномально-в зких веществ, осно .ванный на нанесении на пластинку исследуемого вещества в виде капли и накладывании на нее второй пластины, под действием веса которой отпечаток (п тно) исследуемого вещества на стек ле приобретает форму окружности, и по размерам отпечатка суд т о в зкости 1 .The known method for determining the viscosity of anomalous-viscous substances, is based on applying a droplet on the plate of the test substance and applying a second plate on it, under the weight of which the imprint (spot) of the test substance on the glass takes the form of a circle, and print sizes are judged by viscosity 1.

Недостатком указанного способа определени в зкости вл ютс периодичность измерени (на пластину нанос т три капли и определ ют диаметр каждой а значение в зкости или текучести вычисл ют как среднее арифметическое, причем с , точностью плюс, минус единица текучести).The disadvantage of this method of determining viscosity is the measurement frequency (three drops are applied to the plate and the diameter of each is determined and the value of viscosity or yield is calculated as the arithmetic average, and with, accuracy plus, minus the unit of yield).

Кроме того, этот способ непригоден дл испытани жидких сред с твердыми включени ми, так как частицы твердого преп тствуют прижатию пластин и растеканию капель в соответствии с в зкостью.In addition, this method is unsuitable for testing liquid media with solid inclusions, since solid particles prevent the plates from being pressed and the droplets flow in accordance with the viscosity.

Наиболее близким к предлагаемому по технической сущности вл етс вискозиметр , основанный на определении Closest to the proposed technical essence is a viscometer, based on the definition

0 параметров свободно падающей на круглую пластину из емкости с посто нным уровнем слива струи по величине диаметра купола, образующегос в результате стекани исследуемой среды с го5 ризонтально расположенной пластины.0 parameters freely falling onto a circular plate from a tank with a constant level of jet discharge according to the diameter of the dome, which is formed as a result of the flow of the test medium from a horizontal plate.

Измерение в зкости известным способом требует измерени диаметра тонкослойного купола образованного сход щей с горизонтально расположенной Measuring viscosity in a known manner requires measuring the diameter of a thin-layer dome formed by converging with a horizontally disposed

0 пластины среды 2.0 medium plates 2.

Недостатком вискозиметра, основанного на известном способе измерени в зкости, вл етс низка работоспособность и точность измерени при ра5 боте его на жидких средах с твердыми включени ми, имеющими различную форму , особенно пластинчатую.A disadvantage of a viscometer, based on a known method of measuring viscosity, is the low efficiency and accuracy of measurement when it is run on liquid media with solid inclusions having various shapes, especially plate ones.

Claims

The purpose of the invention is to expand the functional capabilities in the direction of the study of liquid media with solid inclusions of various shapes, especially lamellar. This goal is achieved by the fact that in a known viscometer containing a sensing element, feeding a pipe and a tracking system, the sensing element is made in the form of a spherical substrate mounted above the feeding pipe downward at a distance equal to its double radius, and Xf is the radius of the sphere, and R, is the radius of the feeding pipe. Installing a spherical substrate above the supply nozzle eliminates the fixation of particles of the solid phase on the surface of the sensing organ (particles are easily knocked off and removed with their own weight and the flow forming the dome). The drawing shows a diagram of a proposed device for measuring viscosity. The viscosity measuring device consists of a disc-shaped sphere 1, a supply nozzle 2, with a constant pressure of the medium under investigation, a resistance bridge 3, an amplifier 4, a reversing motor 5, on the shaft 6 of which a probe 7 is fixed, and a indicating device 8, scale which is graded in units of viscosity. The device for determining viscoete works as follows. The flow of the test medium from the nozzle 2 with a constant pressure is directed to the dish-shaped sphere 1, converging with which, forming a dome, the curvature of the dome is tracked by the tracking system 3-7. The bridge 3 of the tracking system is configured in such a way that if there is no contact between the probe 7 and the dome, an unbalance signal arises at the output of the bridge, causing (after amplification) rotation of the shaft 6 of the engine 5 and the approach of the probe 7 to the dome of the test medium. When the probe 7 is in contact with the dome at the output of the bridge (due to parallel connection to the shoulder P of the resistance of the dome section), the phase of the output signal changes, which leads to a change in the direction of engine shaft insertion and removal of the probe from the dome. As a result, a continuous measurement of the curvature of the dome by the tracking system, which depends on the viscosity of the medium under investigation, is carried out. The viscosity of the medium is fixed by the arrow of the indicating device 8, which is connected to the engine shaft. Experiments show that at a flow rate of 1.5 to 3 m / s outflow from the supply nozzle, the sensitive organ is characterized by the following design parameters J Aus 5-7 dn, XF 10 Rn, h 2R. Claims A device for measuring viscosity, containing a sensing element, a nipple nozzle and a tracking system, characterized in that in order to extend its functionality, the sensitive element is designed as a spherical substrate mounted above the feed nozzle convexity down to a distance equal to double radius, with XF 10H | y, where is the radius of the sphere, and Rr, is the radius of the supply nozzle. Sources of information taken into account in the examination 1. The author's certificate of the USSR 158725, cl. G 01 N 11/00, 1962.

2. Authors certificate of the USSR 269578, cl. G 01 N 11/00, 1968 (prototype).

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