SU1651162A1 - Photoelectric device for determining the size and concentration of particles in liquid flow - Google Patents

Abstract

The invention relates to a measurement technique, in particular to the optical control of particles suspended in a liquid, and can be used to control the quality of process fluids and environmental pollution. The aim of the invention is to improve the accuracy of determination by providing the isokineticity of liquid withdrawal and stabilization of its flow rate in the measuring channel. The test fluid flow through the pipeline 1 and then through the sampling tube 3 enters the measuring channel 2, in which the liquid is sensed by the light beam of the emitter 6. The weakening of the light beam caused by the liquid particles is recorded by the photodetector 7, which signals the concentration and particle sizes. The device uses the first 9 and second 10 diffusers, which have the possibility of axial movement, limited. 11. A change in the flow area in the area of the inlet 4 and outlet 5 of the slices of the sampling tube 3 when changing (L to SP in

Description

liquid head and the corresponding flow to stabilize the flow through the movement of diffusers 9 and -10 to the sampling tube 3. 1 sludge.

The invention relates to a measurement technique, in particular, to devices for the optical control of particles suspended in a liquid, and can be used to control the quality of process liquids and to monitor environmental pollution. The aim of the invention is to improve the accuracy by ensuring the isokineticity of liquid withdrawal and stabilization of its flow rate in a measuring canape.

The drawing shows a diagram of a photovoltaic device for determining the size and number concentration of Particles in a fluid flow.

The device contains pipeline 1, measuring channel 2, sampling tube 3 with input 4 and output 5 sections, radiator 6, photodetector 7, fairing 8, first 9 and second 10 diffusers, coil spring 11, stop 12, also shows the profile 13 of the velocity of the fluid along pipe section - Wires 1.u

The inlet section 4 of the sampling tube Ki 3 is installed inside the diffuser 9, and the output slice 5 is inside the diffuser 10.

The device works as follows.

The studied fluid flow, through a pipeline 1 and further through the sampling tube 3, whose inlet 4 and outlet 5, are brought into the unvoiced disturbed fluid flow inside the diffusers 9 and 10, enters the measuring channel 2.

At the nominal flow rate in the pipeline 1, the coil spring 11 compensates for the force resulting from the velocity head flow to the diffusers 9 and 10. The diffusers 9 and 10 are in a position where the cross section of the pipeline in the planes of the inlet 4 and outlet 5 of the sampling tube 3 is em respectively Sgy and SjЈx.

In the event of an increase in the flow rate of the fluid in the pipeline 1, the force of the velocity head of the flow increases by di

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the fuzors 9 and 10, they are shifted along the axis in the direction of flow. At the same time, the dimensions of the sections and the pipeline 1 in the planes of the input 4 and output 5, respectively, of the slices of the sampling tube 3 are increased in such a way that

By increasing the cross section of the pipeline 1 in the plane of the output slice 5 of the sampling tube 3, the pressure differential over the pipeline section 1, in which the sampling tube 3 is located, is stabilized, whereby the flow rate (and hence the velocity) of the liquid through the sampling tube 3 remains unchanged, although the flow rate in line 1 increases. Thus, the flow rate through the sampling tube 3 is stabilized by the diffuser 10.

The increase in the cross section of the pipeline 1 in the plane of the inlet section 4 of the sampling tube 3 with an increase in the flow rate in the pipeline 1 leads to the fact that the linear flow rate of fluid in this plane remains constant and equal to the velocity inside the sampling tube 3, i.e. the change in the flow rate in the pipeline 1, the conditions of isokineticity of the liquid withdrawal due to the presence of the diffuser 9 are not disturbed.

Claims (1)

Invention Formula A photoelectric device for determining the size and counting concentration of particles in a fluid flow, containing a pipeline with the test fluid, inside which the measuring channel provided with a sampling tube, intersected by the common optical axis of the emitter and the associated receiver, is placed coaxially with it that, in order to increase the accuracy by ensuring the isokineticity of liquid extraction and stabilization of its flow rate in the measuring channel, the first vi second diffuser is introduced into the device and a cylindrical 516511626 the spring, while connected mechanically with the second diffuser, the input and First and second diffusers of the raz-output cuts of the sampling tube put their openings inwardly located inside respectively fluid flow and are made with possible first and second diffusers, with the simultaneous axial variable displacement of the profiles of the surfaces of the first and profiles bounded by cylindrical second diffusers spring, one end of which is fixed-distribution of the velocity of the fluid on flax in the pipeline, and the other is the connection section of the pipeline.