RU28639U1 - Laboratory cabinet for sterile work - Google Patents

Description

 about 2

at 08 at 15/02

Laboratory cabinet for sterile work.

The utility model relates to means for protecting the test product, operator and the environment from aerosols, dust and volatile substances and can be used when working with cell cultures, pathogenic microorganisms and cytostatics, for sterile work in healthcare, veterinary medicine, in chemical and pharmacological industries.

Currently, a large number of laminar cabinets operating on the principle of air recirculation are known, in which the laminar flow purified by filters enters the working chamber and is removed into the air ducts through openings in the surface of the table (see U.S. Patent Nos. 4,908,174 and 3,926,597).

The closest in technical essence to the proposed device is a laboratory cabinet (US Patent N 5700190), containing a housing in which the filter chamber is made, at the output of which there is a table made with perforations, and an air duct connecting the output of the working chamber with the input of the filter chamber, and a fan installed at the entrance to the filter chamber, while the working chamber is made with a working opening on the vertical wall of the housing.

A disadvantage of known laboratory cabinets is the low degree of purification of polluted air.

The technical result of the utility model is to increase the degree of air purification.

The specified technical result is achieved by the fact that the laboratory cabinet containing the filter chamber, the output of which through the first filter is connected to the input of the working chamber, at the output of which there is a table made with perforations, and an air duct connecting the output of the working chamber with the chamber inlet filters, and a fan installed at the entrance to the filter chamber, while the working chamber is made with a working opening on the vertical wall of the housing, contains a bactericidal lamp located in the working chamber and at the extreme it has at least one second filter mounted in the filter chamber on the vertical wall of the housing, while on the outside of the second filter there is a grill configured to change its flow area, and the fan contains a rotational speed controller. Sui; the utility model is illustrated by the drawings, FIG. 1 shows two front and side views of the cabinet, FIG. 2 shows a diagram of the air flows in the cabinet.

The cabinet contains a housing 7, in the upper part of which a fan chamber 1 is made, which is connected to the filter chamber 2 and the working chamber 3 by means of air vents 4, and supports 5. In the fan chamber 1, a fan 6 is installed having a speed controller. In the filter chamber 2, a first, preferably large, filter 8 is installed, communicating with the working chamber 3, and communicating with the environment, one or more second filters 9, which are smaller in size of the filter 8. The filters 9 on the outside of the cabinet are closed by gratings 10 made with the possibility of changing their bore. The veterinary chamber 1 and the filter chamber 2 on the front side of the cabinet are closed by one or two removable panels 11 and 12., providing free access to the fan 6 and filters 8 and 9 for maintenance.

In the working chamber 3 there are one or two lamps 13 and one lamp with a fluorescent bactericidal lamp 14. The working chamber has a working opening 17 and is equipped with a lifting glass 15. The working surface of the table 18 in the working chamber 3 is perforated and formed, for example, from 2-3 perforated adjacent pallets 16 mounted.

Air purification in a laminar cabinet operating on the principle of recirculation of air is as follows (see figure 2).

When you turn on the fan 6, the air is pumped into the filter chamber 2, which is a static pressure chamber, and passing through the filters 8 and 9, it is cleaned. The bulk of the air passes through the filter 8 and laminar vertical flow enters the working chamber 3. The rest of the air through the filters 9 is discharged into the environment, due to which air is sucked through the working opening 17 into the working chamber 3. The air entering the working chamber 3 is sucked fan 6 through the perforation of pallets 16 of the working table 18, the air passing through the perforation enters the ducts 4. By adjusting the speed of rotation of the fan 6 and changing the bore of the lattice 10, the necessary flow rate in the working chamber 3 and the working opening 17.

Most of the air passes through the filter 8 and circulates inside the cabinet, and part (20-25%) enters the room through the filters 9. The removed volume is replaced by air from the room, which enters through the front working opening 17.

The air coming from the room creates a reliable curtain that prevents the discharge of contaminated air from the working

chambers 3. At the same time, the downward flow of filtered air protects the working chamber 3 from the ingress of contaminated air particles from the room.

Claims (2)

1. A laboratory cabinet comprising a housing in which a filter chamber is made, the output of which through the first filter is connected to the inlet of the working chamber, at the output of which there is a table made with perforations, and an air duct connecting the output of the working chamber with the inlet of the filter chamber, and a fan, installed at the entrance to the filter chamber, while the working chamber is made with a working opening on the vertical wall of the housing, characterized in that it contains a bactericidal lamp located in the working chamber and at least one second filter, mounted in the filter chamber on the vertical wall of the housing, while on the outside of the second filter there is a grill configured to change its flow area, and the fan contains a speed controller. 2. Laminar cabinet according to claim 1, characterized in that the housing is mounted on a support.