SU496465A1

SU496465A1 - Method of measuring fluid flow

Info

Publication number: SU496465A1
Application number: SU742038134D
Authority: SU
Inventors: Вульф Борисович Эткин; Михаил Яковлевич Мотро
Priority date: 1974-06-25
Filing date: 1974-06-25
Publication date: 1975-12-25
Also published as: SU493639A1

Description

1one

Изобретение относитс к измерительной технике и может быть использовано, в частности, пр.и измерении расхода агрессивных , в зких и других жидкостей или газов, нреимущественно содержащих твердые или жидкие взвешенные частицы.The invention relates to a measurement technique and can be used, in particular, to measure the flow rate of aggressive, viscous and other liquids or gases, particularly containing solid or liquid suspended particles.

Известны способы .измерени расхода жидкости или газа, транспортирующего взвешенные частицы, по зменению перепада давлений при отклонении вспомогател ной струи, вводимой в контролируемый поток под углом к нему.There are known methods for measuring the flow rate of a liquid or gas transporting suspended particles to increase the pressure drop when the auxiliary jet deviates in the controlled flow at an angle to it.

Однако известные способы имеют недостаточную точность и стабильность измерени вследствие зависимости выходного сигнала от температуры и давлени в потоке а также от коэффициента сопрот.ивлени линий подвода вспомогательной струи недостаточную надежность и ограниченный диапазон применени поскольку чувствительные элеменаы измерительных устройств подвержены воздействию потока, содержащего абразивные частицы, повышенную сложность измерительных устройств, реализуюш .их эти способы .измерени .However, the known methods have insufficient accuracy and stability of measurement due to the dependence of the output signal on temperature and pressure in the stream, as well as on the resistance coefficient of the auxiliary jet supply lines, insufficient reliability and limited range of application, since the sensitive elements of the measuring devices are exposed to a stream containing abrasive particles, increased the complexity of the measuring devices, realizing them. these methods.

Целью изобретени вл етс повышение точности, надежности, расширение области применени способа и упрощение его конструктивной реализации. ;The aim of the invention is to improve the accuracy, reliability, expand the scope of application of the method and simplify its constructive implementation. ;

Дл этого скоростной напор струи поддерживают посто нным, а о расходе суд т по перепаду давлений, обусловленному потер м .и выхода при непосредственном воздействии измер емого потока на эту струюFor this purpose, the jet head pressure is kept constant, and the flow rate is judged by the pressure drop due to the loss of output and flow when the measured flow directly affects this jet.

На чертеже приведена схема устройства , реализующего предложенный способ измерени .The drawing shows a diagram of a device implementing the proposed measurement method.

Claims

The device contains a tube 1, the outlet of which is placed so that the auxiliary jet of liquid or gas flows out of it at an angle to the controlled-gall flow. The flow meter 2, for example the diaphragm, measures the velocity head (flow) of this flow. Pointer 3 and valve 4 allow you to control and regulate the jet head. Using the pointer 5, for example a differential pressure gauge, the pressure loss at the jet outlet from the tube 1 is monitored. When measuring the flow rate flowing through the pipeline, it is advisable to place the outlet of the tube 1 on its wall 6 longitudinally streamlined by the stream. Narrowing 7 allows, if necessary, to equalize the velocity field of the controlled flow. The device operates as follows. Pipe 1 supplies an auxiliary gas (liquid), the jet of which emanates from its outlet orifice at an angle to the controlled flow. Velocity head (the flow rate is kept constant by means of a valve 4 according to the indicator 3 connected to the flow meter

2. The pressure loss at the outlet of the jet from the tube 1 depends on the velocity head of the flow, the flow rate of which is measured. The higher the velocity head, the stronger its direct effect on the auxiliary jet, which leads to its deformation, and the higher the pressure drop caused by the output loss recorded by the pointer 5. The method of measuring the flow rate is non-contact. It is based solely on the laws of the direct interaction of the auxiliary jet with the flow of the medium. At the same time, the accuracy and reliability of the measurement is improved, the design of measuring devices is greatly simplified, and it becomes possible to measure aggressive, explosive liquid flows, n,: "s1-carrying gases, etc." The velocity of the auxiliary jet ensures that the measurement result is independent of temperature and pressure in the flow . The high sensitivity of the measuring devices in the wide range of flow rates of the medium is achieved by choosing the optimal speed of the auxiliary jet and directing the jet at a blunt or acute angle to the flow. It is especially convenient to apply the proposed method for measuring the flow rate of a medium having special properties when the introduction of a jet of liquid (gas) into a controlled flow is provided by the technology of a particular process. The invention of the method of measuring the flow rate of the medium by changing the pressure drop when the auxiliary jet deviates into the controlled flow at an angle to it, characterized in that, in order to increase accuracy, reliability, expand the field of application of the method and simplify its constructive implementation, the velocity head of the jet they are kept constant, and the flow rate is judged by the pressure differential caused by the output losses under the direct influence of the measured flow on this jet.