RU2646922C2 - Surface sampling device - Google Patents

Abstract

FIELD: measuring equipment.

SUBSTANCE: device comprises the body with the tangential intake manifold and the lance pipe, the cyclone collector, the outlet fitting and the drain port in the body. The tangential intake manifold and the lance pipe are coupled by virtue of the tube with the sampling probe with the grid. Upon that, the cyclone collector cylinder is gapped accomplished towards the lower main body. The device is equipped with the central manifold, at the bottom of which there is a gate valve, made exposed through the body bottom. The lance pipe is introduced into the central manifold and the whirler is located on the top part.

EFFECT: fine fraction capture efficiency upgrading and possibility of the surface sampling.

1 dwg

Description

The invention relates to sampling systems and is intended, in particular, for sampling from the soil surface and various surfaces of industrial premises (floor, walls ...) for subsequent biological or chemical analysis. It can be used in agriculture, medicine, at the enterprises of the microbiological and chemical industries, as well as for determining the concentration of pollution in the environment (air, soil).

To obtain representative samples when sampling from the surface, it is advisable to aspirate significant volumes of air and, accordingly, examine a sufficiently large area. High performance samplers must be used. When sampling from various surfaces, cotton swabs (indoors) are mainly used or taken at specific points in natural conditions. Nowadays, technical means are used, for example, washing vacuum cleaners for washing off contaminants from the surface [1]. It can also be used for sampling from the surfaces of an air sampler after their appropriate adaptation.

The closest in technical essence to the proposed device is an aerosol biological sampler [2]. It includes a housing, an intake intake pipe with an ejector, a vortex chamber, a conical cyclone, a reservoir for the sorbing liquid. This liquid sampler does not provide high efficiency in the capture of fine fractions, as contains only one delay stage. In addition, when sampling from the surface, clogging of the device elements with solid particles is not excluded.

The aim of the invention is to increase the efficiency of capture of finely dispersed fractions and to enable sampling from the surface.

This goal is achieved by the fact that in the device the cyclone cylinder is made with a gap with respect to the lower part of the housing, while the device is equipped with a central nozzle extending outward through the bottom, and an ejector tube is introduced into this nozzle, a swirler is located on the upper part of the nozzle, and an inlet is installed damper.

In FIG. 1 shows a device for sampling from a surface. It contains a housing 1 with a tangential intake pipe 2, a cyclone cylinder 3, ejector tubes 4 and 13, a central pipe 5, a swirler 6, an outlet pipe 7, a drain hole 8, a fine mesh 9, a pipe 10, a sampling probe 11 with a mesh 12, a flap 14 is installed at the bottom of the central pipe 5.

A device for sampling from the surface works as follows. When connecting an aspirator through a sampling probe 11 located and moving along the surface to be examined, soil fragments and other solid particles are sucked in with the air; the flow passes through the pipe 10 into the intake pipe 2, in which a vacuum is created. Under the action of rarefaction, liquid flows through the ejector tube 4, which is dispersed by a high-speed flow, particles in the flow are intensively adsorbed on the surface of the liquid droplets. Next, the flow enters the cylinder of the cyclone 3, where it acquires a rotational motion, solid particles and liquid droplets are thrown onto the wall of the cylinder 3 due to centrifugal force to form a liquid film. Sufficiently large fragments are separated from the flow and, under the influence of gravity, are lowered down to the net 9. The liquid film with the remaining solid fraction swirls upward, when it reaches the edge of the cylinder 3, it is thrown onto the wall of the casing, flowing down, washing off particles as well, and the cleaned air stream leaves through pipe 7. Simultaneously with the main stream passing into the intake pipe 2, clean air enters through the central pipe 5. In this case, under the influence of rarefaction, a liquid is dispersed into the pipe 5 by means of an ejector tube 13. The gas-liquid flow rises and passes through the swirl 6, acquiring a rotational motion, while the droplets form a liquid curtain moving to the wall of the housing 1. This liquid curtain contributes to the additional adsorption of solid particles and reduces splashing. The damper 14 allows you to adjust the air flow into the device and, accordingly, the intensity of the liquid curtain formed in the gap between the swirl 6 and the housing 1. For example, when capturing hydrophobic dust, it is advisable to fully open the damper in order to create a saturated curtain and increase the delay coefficient.

A device for sampling from the surface can be used in environmental monitoring, in assessing the quality of disinfection, etc.

Information sources

1. Patent for the invention of the Russian Federation No. 2371203, class. A61L 2/18, G01N 33/02, 2008.

2. Patent for the invention of the Russian Federation No. 2353914, class., G01N 1/22, C12M 1/26, 2007.

Claims (1)

A device for sampling from a surface, characterized in that it comprises a housing with a tangential intake pipe and an ejector tube connected by a tube to a sampling probe with a mesh, a cyclone, an outlet pipe and a drain hole in the housing, while the cyclone cylinder is made with a gap with respect to to the lower part of the housing, the device is equipped with a central nozzle, at the bottom of which a shutter is installed, which exits through the bottom of the housing, and an ejector tube is introduced into this nozzle and a head is located on the upper part hritel.

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