SU1244175A1 - Device for microbiological analysis of air - Google Patents

Description

one

The invention relates to phobic withdrawal devices for trapping bacteria and viruses from air and can be used to separate the dispersed phase in microbiological air analysis.

The aim of the invention is to improve the accuracy of the analysis by increasing the degree of trapping the dispersed phase from the air.

The drawing shows the device, General view. .

The device comprises a cylindrical body 1 with co-axial inlet 2 and outlet 3 nozzles. A silo 4 with a sorption liquid 5 is fixed to the housing 1. The cylindrical inlet 2 is made in the form of a cup, the base of which is housed in the housing 1, on the side surface adjacent to the base has a perforated section 6, the distance to the inner surface of the housing 1 is 0,5 - 5 diameters of perforation hole. A screw-turbulent plate 7 and a nozzle 8 are connected in series to the inlet branch pipe, connected to the bunker 4 by a tube 9 immersed in a sorption liquid 5.

The diameter of the perforation holes is constant and equal to 1 mm, which corresponds to the maximum diameter of the coarse g-aerosols.

The device works as follows.

560

0, 6

33, 6

560 560 560 560 560 550

0.8 0.9 0.95 0.95 0.95 0.96

44.8 50.4 53.2 53.2 53.2 52,

55

Table 2 presents the results of the PS in various nodes of the device according to the degree of trapping of the dispersed phase, compared with the prototype.

five

0

five

0

five

75 .2

The air under the action of the discharge created by the aspirator, connected to the outlet nozzle 3 of the device, enters the inlet nozzle 2, passes through a spiral plate 7 swirling the air flow past the nozzle 8, which disperses the sorption liquid, which disperses the dispersed phase from the air. Rotation of the air flow in the inlet pipe leads to the opening of the flare and more complete capture of particles suspended in the sorption liquid suspended in the air. The sorption liquid with the air flow passes through the holes 6, inertially deposits on the inner surface of the housing 1 and flows into the hopper 4. Tube 9 carries recirculation of the sorption fluid, ensuring the concentration of the captured dispersed phase in the bunker. After the end of the air sampling, the bunker 4 with the dispersed phase detached in it is sent for analysis, and a replaceable bunker with sterile sorption liquid is installed in its place in the housing 1.

The dependence of the degree and speed of trapping the dispersed phase from the air in the device on the distance between the perforated part of the inlet nozzle and the side surface of the body with a hole diameter of 1 mm, a particle size of 10 µm and the concentration of the last 0.1 mg-l are presented in Table. one.

Table 1

490,350 0.96 0.96 19.0 35.5

table 2

Devices Volumetric Distribution of sediment dispersed phase,% speed

Air Bunker Housing Filter (overshoot) l / min

The proposed device 56093 25

Prototype 56073,5 1,5 25

In Table 3, the efficiency of the device for sample microbial cells in comparison is illustrated by the number of cells captured in the prototype.

Table 3

Volume Devices Selected

samples, l Number of microbial cells

in the sample

The proposed device112072

Prototype 1120 57

The results indicate 35 concentrations of the dispersed phase in to improve the accuracy of the determined air.

Editor N.Gorvat

Compiled by E.R1lyin

Tehred L.Oleynik Proof-reader I.Erdeyi

Order 3773/27 Circulation A90 Subscription

. VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nabo, 4/5

Production and printing company, Uzhgorod, Projecto st., 4

Claims (1)

DEVICE FOR MICROBIOLOGICAL ANALYSIS OF AIR, containing a cylindrical body with a hopper for sorption liquid and the dispersed phase trapped in it from the air, a cylindrical inlet pipe with a screw plate and nozzle installed in it, connected to the hopper by a tube immersed in the sorption liquid, and an outlet pipe a source of vacuum, characterized in that, in order to increase the accuracy of the analysis by increasing the degree of capture of the dispersed phase from the air, the nozzles are installed inside to of the housing is coaxial with it, and the inlet pipe is made in the form of a cup, the base of which is placed in the housing, and on the side of the cylindrical surface adjacent to the base there is a perforated section, the distance of which to the inner surface of the housing is 0.5 - 5 diameters of the perforation hole. SU. „1244175