SU903735A1 - Automatic liquid sampler - Google Patents

Description

(54) AUTOMATIC SAMPLER FOR LIQUID

I

The invention relates to liquid sampling devices and can be used in sewage treatment plants where automatic sampling for a physicochemical analysis is required.

Known sampler with periodic sampling of liquids l J.

However, this device does not ensure the accuracy of the sample dosing, since its volume in this case is determined only by the specified time of fluid supply to the sampler, and not by a fixed volume.

Closest to the proposed technical entity is an automatic fluid sampler containing a pump, an automation system, a sampler, a dispenser with nozzles for entering liquid, draining excess liquid and a sample draining and a valve for closing the sample drain nozzle 2.

A disadvantage of the design of the sampler is the presence of valves, which limits its field of application and reduces the reliability of the sampler because of the need to pump a pre-filtered liquid, since the ingress of small inclusions in the valve into the valve leads to the outflow of the liquid to the mash and As a result, the sampler is out of order.

In addition, the design of the sampler is complicated by the presence of additional mechanical devices.

IS in the form of air valves.

The purpose of the invention is to increase reliability and simplify the design of the sampler.

Claims (2)

The goal is achieved by the fact that the dispenser is provided with a vertical re-liner, which divides it into chambers, one of which is made with a hole in its upper part and is equipped with an additional well pipe with the discharge of excess liquid, while the pipe for discharge of excess liquid is provided with a tube installed inside the dispenser the vertical partition is made with a hole in its upper part, having a cross section of not more than 1% of the cross section of each of the nozzles for draining excess liquid. The drawing shows an automatic sampler, a general view. The sampler contains the pump 1, the dispenser 2, block 3 automation, valve 4, the sampler; 5. The dispenser 2 is divided by a partition 6 into a chamber dbe of the dosing chamber 7 and an auxiliary 8. The dispenser chamber 7 has three patches: inlet 9, for draining excess liquid 10 and for draining sample 11; The auxiliary chamber 3 has an additional drainage nozzle for draining excess fluid, opening A / connecting its internal cavity with the atmosphere and opening B in the partition 6. The operation of the sampler is carried out in the following way. By pump 1, fluid is supplied through pipe 9 to chamber 7 of dispenser 2. In the initial period of the sampling cycle, pipe 1 1 is blocked by K1Pan 4 and liquid passed through chamber 7, pipe 10 and, partially, port B and pipe 12, is directed back to the same container from which the sample is taken. Since the cross section of the hole was small compared to the cross section of the drain pipes 10 and 2, the auxiliary chamber 8 does not have time to fill with liquid during the time of its pumping through the metering device. Therefore, pouring fluid through port A was eliminated. After the time specified by the program, the pump I automatically shuts off, after which the excess amount of liquid in chamber 7 is discharged through the lO nozzle to its upper edge, the level of which corresponds to the specified sample volume. The excess fluid is drained almost instantly after the pump 1 is turned off, as chamber 7 communicates with the atmosphere through openings A and B. Then, B according to a predetermined program, valve 4 opens. AND LIQUID from chamber 7 is discharged into sampler 5. Pump I and valve 4 are controlled by an automation unit 3, by means of which time intervals are set between sampling, the sampler has a simpler design, which reduces its cost. By reducing the number of mechanical assemblies and replacing them with a static device, the reliability of the sampler is improved, and its maintenance is simplified. The economic efficiency of the sampler, determined by comparing the automatic sampler with the sampler for manual sampling, is 85% of the working time spent on sampling, while the remaining time is used to perform other work. Claims of the Invention An autosampler for a fluid comprising a pump, an automation system, a sampler, a dispenser with nozzles for inlet of a liquid, draining excess liquid and draining a sample and a valve for shutting off the nozzle of a sample, in order to increase reliability and simplify the design, the dispenser is equipped with a vertical partition dividing it into chambers, one of which is made with a hole in its upper part and is equipped with an additional branch pipe to drain excess liquid, and a branch pipe for va excess liquid is provided with a tube mounted inside the dispenser, the vertical partition wall provided with an opening at the top of its partial, cross section having no more than 1% of the sectional area of each of the pipes for -sliva excess liquid. Sources of information taken into account during the examination 1. Edmund Buhler prospectus at the 2nd International Exhibition Interbytmash-76. . 2. Wood L.B., Stanbridqe N.N. Automatic Samplers-Water Pollution Control, 1968, vol. 67., No. 5, p. 495-518.