SU565231A1

SU565231A1 - Automatic density meter

Info

Publication number: SU565231A1
Application number: SU7502104475A
Authority: SU
Inventors: Борис Борисович Булгаков; Ростислав Яковлевич Ладиев; Юрий Александрович Остапенко; Леонид Иванович Пищенко
Priority date: 1975-02-13
Filing date: 1975-02-13
Publication date: 1977-07-15

Description

1one

Изобретение относитс к технике измерени плотности, ,в част.ности к автоматическим плотномерам, служащим дл .измерени ллотности жидких сред, например, приборов с пневматическим выходом.The invention relates to a technique for measuring density, in particular, to automatic density meters, which serve to measure the density of liquids, for example, instruments with pneumatic output.

Известен -плотномер, состо щий из мембранных приемников давлений, залолиенных эталонной жидкостью 1.The known is a density meter consisting of membrane pressure receivers, salted with a reference liquid 1.

Недостатками такого плотномера вл етс низка точность и неста бильность его -показаний во времени.The disadvantages of such a densitometer are the low accuracy and instability of its indications in time.

Наиболее |близким по техинческой судшости К предлатаемому изобретению вл етс автоматический плотномер с темлературной кО:Мпе«сацией, содержащий измерительную схему, выполненную в виде мембранных измерителей , св занных с коромыслом пневматического преобразовател , (блока обратной св зи , управл ющего элемента типа сопло-заслонка , блока компенсации температурной погрешности , и вторичный лрибор.The closest in technicality to the proposed invention is an automatic density meter with a temperature measurement: CO. Meter, containing a measuring circuit made in the form of membrane meters connected to the pneumatic converter rocker arm (feedback unit, control element of the nozzle type). damper, temperature error compensation block, and secondary device.

В этом автоматическом плотномере устройство температурной (Поправки выполнено так, что измерители мембранного тнпа заполнены жидкостью и часть подвижной системы находитс непосредственно в жидкости, -плотнасть которой измер етс , что приводит к громоздкости конструкции, понижению точности из-за сложности вывода сигнала и усложн ет обслуживание (2).In this automatic densitometer, a temperature device (Corrections made so that the meters of membrane diaphragm are filled with liquid and part of the moving system is directly in the liquid, the density of which is measured, which leads to cumbersome design, reduced accuracy due to the complexity of the signal output and difficult maintenance (2).

Цель изобретени - упрощение конструкции и повышение томности.The purpose of the invention is to simplify the construction and increase the languor.

Это достигаетс тем, что предлагаемый плот1Номер снабжен дросселем и блоком поддержани посто нного перепада на этом дросселе , причем выход блока компенсации температурной погрешност1и соединен со входом блока поддержани посто нного перепада давлени , а дроссель соединен с управл ющим элементом типа сопло-засло1нка.This is achieved by the fact that the proposed Density is equipped with a throttle and a unit for maintaining a constant differential on this throttle, the output of the temperature error compensation unit 1 is connected to the input of the unit for maintaining a constant pressure differential, and the throttle is connected to a control element of the nozzle type.

На чертеже изображен предлагаемый плотномер , состо щий из проточной камеры 1 с измерител ми мембранного типа 2 св занными с рычагом 3, который закреплен на опоре 4, управл ющего элемента типа сопло-заслонка 5, св занного с блоком обратной св зи б, и блока компенсации температурной погрешности , состо щего из турбулентного 7 и ламинарного 8 дросселей и св занного с блоком поддержани посто нного перепада давлени , выполненного в виде п тимембранпого элемента сравнени 9, на дросселе 10. Пружина 11 .служит дл установки 1нул .The figure shows the proposed densitometer consisting of a flow chamber 1 with diaphragm type meters 2 connected with a lever 3, which is fixed on a support 4, a control element of the nozzle-valve type 5 connected with feedback block b, and a block compensation of the temperature error, consisting of a turbulent 7 and a laminar 8 throttles and connected to the unit for maintaining a constant pressure differential, made in the form of a five-membrane element of comparison 9, on the throttle 10. The spring 11 serves to install 1nul.

Claims

Densitometer works: as follows. The measured liquid is pumped through the flow chamber 1. As a result of the change in the density of the liquid, the hydrostatic pressure on the meters of the membrane pump 2 changes, and the force on the lever 3 changes, which under the action of these forces rotates relative to the support 4, resulting in A gap in the flat-element element of the type. Salt flap 5. The PI pressure after throttles 10 lays on the feedback block 6 and | Pa the output of the automatic. | density meter. The power to the throttle 10 is supplied from the unit. It maintains a constant pressure differential, which consists of 5 membrane elements 9 pressure comparisons, into one of which, the pressure PI formed between the throttle 10 and the control element of the nozzle-damper type 5 is shock. When the pressure PI increases, the memembrane block of the element moves downwards, the pressure PZ increases at the output of P2 Pl + (Pt - Rzad), where Pf is the correction pressure; ass - set pressure. Thus, the throttle 10 is maintained at a constant pressure drop P. P P2-Pi Pi-P,.,. (2) which depends on the pressure of the Rzad reference, and the corrective pressure P t. The corrective pressure I / forms a pneumatic thermometer, which consists of a laminar 8: And a turbulent 7 chokes. When the temperature of the measured fluid changes, the resistance of laminar throttle 8 changes, i.e., P ;. , as a result of which the constant pressure drop across the throttle 10 is changed. Thus, the error of the change in temperature of the measured liquid is compensated. The use of the proposed measuring circuit reduces its cumbersomeness and rigidity, as a result of which (Measurement accuracy is increased by 25-30% compared with known Structures. Invention for example, a membrane, control element such as a nozzle-flap, a temperature error compensation unit, characterized in that, in order to improve accuracy and simplify the design, it removes ; a bang choke and a constant differential block on this throttle; the output of the Temperature Error Compensation block is connected to the inputs of the constant block (differential pressure, and the drosel is connected to a nozzle-transponder control element. Sources of information taken into account during examination 1.Glybin I.P. Automatic density meters, Kiev, Technique, 1965, pp. 99.

2. The author's certificate number 157544, cl. G 01N 9/26, 1963.