SU507355A1 - Laboratory box - Google Patents

Description

(54) LABORATORY BOX

The invention relates to the construction of laboratory boxes and can be used in laboratory practice when working with dusty granular substances.

Known laboratory box containing a sealed enclosure with a lid, elastic gloves and fittings input and output of compressed gas.

: At the moment the operator’s hands are put into the box or when they are removed from it inside the box, pressure or vacuum occurs, which causes powdered substances to dissolve. Boxes made of polyethylene film allow a more stable internal pressure to be obtained, but wear out quickly, cracks appear, and leak tightness is disturbed. To enter gas in such boxes, as in organic glass boxes, only one shuper is used, which leads to the formation of stagnant zones and a slow renewal of the atmosphere inside the box.

Thus, the main disadvantages of the known devices are: the change in pressure in the box during the input and output of hands

operator, the formation of stagnant zones and the slow updating of the atmosphere inside the box.

In order to maintain a constant pressure in the absence of a supply of compressed gas and the elimination of stagnant zones, supply the box with buffer containers made of plastic material and installed on the lid. In addition, in the lower part of the housing, a horizontal perforated partition is installed, and the gas inlet fittings are located along the periphery of the housing.

FIG. 1 shows the proposed box, a longitudinal section; in fig. 2 - section

JA-A in FIG. one.

; The laboratory box consists of a body: 1, a cover 2, made of a solid transparent material, such as organic glass. To ensure leaktightness, the cover is attached to the body through the procap. The cover 2 has fittings 3. The central one is designed to exit the gaea during purging and is closed with a stopper. At the total fittings 3, buffer cavities 4 made of elastic material, for example rubber balls, are fitted. Inside the housing 1 (in its lower part) a perforated partition 5 is installed, which is a gas distributor and a working table at the same time. Under the partition 5 on the side walls of the case there are a number of fittings 6 connected by a collector 7 for gas inlet. Elastic gloves 8 for the hands of the operator are hermetically sealed on the side walls of the case.

The described laboratory box works as follows. To create the desired atmosphere inside the box, through the collectors

7 and fittings 6, an inert gas is supplied, which, passing through a perforated partition 5, is evenly distributed over the entire cross section of the box, rises up and, gradually forced out, the air in the box goes out through the central fitting 3. Parameters of the atmosphere in the box are constant controlled by a barothermohygrometer located inside the box. After obtaining the atmosphere of the required parameters, the central nozzle 3 closes and the gas supply stops.

All operations with loose powder products in the box are performed by the operator through elastic gloves 8. When

the introduction into the box and the removal of the operator’s hands from it, the pressure inside the box is kept constant due to the corresponding expansion or contraction of the buffer cavities 4 and the dispersion of the powdered product does not occur.

Formula

the invention

Claims (1)

1. Laboratory box for handling bulk materials, containing a sealed housing with a lid, elastic gloves and gas inlet and outlet nozzles, characterized in that, in order to maintain a constant pressure when there is no supply of compressed gas, it is equipped with buffer tanks fulfilled from elastic material and installed on a cover. 2, The box of claim 1, wherein, in order to eliminate stagnant zones, a horizontal perforated partition is installed in the lower part of the body, and the gas inlet fittings are located along the periphery of the body. eight b- 7-7 f FIG. 2