SU1242768A1 - Device for sampling aerosol - Google Patents

Abstract

This invention relates to instrumentation engineering and can be used in microbiology and medicine. The aim of the invention is to enhance the functionality of the device by providing for sampling from cavities with a pressure below atmospheric. The device consists of an impactor, in the input channel of which a filter is placed. A disk is placed above the filter, along the perimeter of which a ring groove is made. There are holes at the bottom of the groove. Above the holes there is an elastic torus fitted with a pressure ring. In the inlet channel of the impactor there is also a supply pipe for the test sample. The hole in the disk and the cavity in the housing, communicated with the input channel of the impactor, form a channel for supplying sterile air. 4 il. (L

Description

The invention relates to a measurement and control technique for microbiological research, is intended for the study of aerosol particles by size distribution, and can be used in microbiology and medicine, especially for performing sanitary-hygienic and technological control in microbiological industry.

The purpose of the invention is to expand the functional capabilities of the device for sampling aerosol deposition by providing samples from cavities with a pressure below atmospheric.

FIG. 1 shows a general view of the device in section; FIG. 2 is a section A-A in FIG. 1 (annular groove of the upper disc); in fig. 3 is a view B in FIG. 1 (cam clamp and feed channel of the sample being tested aerosol); in fig. 4 is a cross-section bb and FIG. 1 (cam clamp to shut off the sample feed channel). I

The device includes a cascade impactor 1, containing accelerating nozzles 2, with substrates 3 located under them, a removable body 4 in which a channel 6 supplying a test air sample, coaxial with the input channel of the impactor 5, is installed in a pressure screw 7 screwed into the body 4. In the latter - there is a sterile air inlet channel formed by an annular cavity

8, inclined radial passages

9 connecting the annular cavity 8 with the input channel of the impactor 5, the holes 10 in the disk 12, the holes 11 in the disk 13 located at the bottom of the ring groove and the annular gap between the wall of the ring groove and the elastic torus 15 of annular section located in this groove deformed by the gland ring 16 screwed into the disk 13

On the clamping screw 7 is a cam clip 17 for. clamping the elastic hose 18 for supplying the test aerosol attached to the channel 6. On the body 4 a pressure gauge 19 is mounted, connected by hoses 20 and 21 to the inlet channel of the impactor. 5 and hose 18.

42768, 2

Before operation, the devices are filled with sterile air during assembly.

The supply hose 18 of the test aerosol is connected to the container from which the sample is taken. Impactor 1 is connected to the source of discharge (not shown). Air passes through the gap between the wall of the annular groove of the disk 13 and the torus 15 of the opening 11 of the filter 14 and is sterilized, then it passes through the opening 10, the annular cavity 8 and the inclined radial passages 9

t5 impactor 1, a sterile return flow is established in the impactor. After that, at time 19, the pressure drop between the input channel 5 of the impactor and the cavity from which the sample is taken is determined. The differential pressure necessary for suction of the test sample of aerosol into the impactor 1 is established, for which the pressure in the input channel of the impactor is changed,

25 by turning the nut 16, deforming the torus 15. The pressure in the inlet channel is changed by changing the resistance of the gap between the wall of the annular groove of the disk 13 and the torus 15,

30, accompanied by a change in the pressure on it, passing as a result of a change in the gap width during deformation of the torus 15 by the pressure ring 16.

35 After the stationary workers have set the flow rate through the sterile flow and the necessary pressure drop is established between the inlet channel of the impactor and the cavity,

40 from which a sample is taken, the lever 22 is shifted from a horizontal position to a vertical position, the channel 6 introducing the test air is opened and the test air is introduced into the sterile stream. I

Entering the required volume of air sample under investigation through channel 6 into the device, lever 22 is shifted to a horizontal position, hose 18, through which the test air is fed, presses the strap 23. Thereafter, sterile air through the device continues to pass through the device and 11, a filter 4, an annular cavity 8 and inclined radial passages 9. If the supply is stopped after the passage of the entire test air, enter

via channel 6, through the impac- tor.

With the passage of the investigated air through the impactor occurs inertial separation and deposition of particles on the substrate 3.

After the sampling is completed, the substrates 3 are removed and analyzed in a known manner, for example, the cultivated visible colonies of microorganisms are counted.

Claims (1)

Invention Formula An airborne sampling device containing an impactor, on the inlet channel of which a filter is placed, a supply pipe for the test sample. 2427684 installed coaxially in the inlet channel of the impactor, and the sterile air supply channel formed by the hole in the discs and the cavity in the housing connected by passages to the impactor inlet channel, and the sample supply pipe of the test sample is placed in the pressure screw, characterized in that 10 expansion of functionality by providing sampling from cavities with a pressure below atmospheric, along the perimeter of the disk placed above the filter, is made 15 there is an annular groove, at the bottom of which there are holes, and above the holes there is an elastic torus equipped with a pressure ring. 22 in the spike Order 3694/39 Random polygons pr-tie, Uzhgorod, st. Project, 4 FIG L Circulation 778 Subscription