SU1112193A1 - Dust protection chamber for work table - Google Patents

Abstract

M. DUST RELEASE CAMERA FOR WORK TABLE, containing a casing with an opening open on one side, a fan with air ducts for supplying air to the chamber in two streams, one of which, horizontal, is located above the plane of the working table, and the other is vertical. openings, air distributors with filters and exhaust grids installed respectively at the air inlet and outlet places and placed in the walls of the casing, the exhaust chamber connected to the exhaust grilles and dampers for adjusting the amount of air supplied and exhausted, characterized in that, in order to increase the reliability of the working volume of the chamber from the penetration of dust particles from the ambient air into it and to protect the worker from the effects of toxic substances used or excreted in the chamber Operations, the casing is equipped with a cellular spraying grille connecting the working volume with the external environment and placed in the plane of the open projection of the eBZSjD КТНЯ and along its entire height on the side of the exhaust grid horizontal th stream, the honeycomb lattice axis perpendicular to the plane of the open aperture.

Description

2. Chamber of pop, 1, characterized in that the flaps are made in the form of a perforated gate installed with the possibility of moving along a perforated base,

equipped with a cellular air distribution grille, with the perforation holes of the coaxial base of the honeycomb air distribution grid.

The invention relates to ventilation, in particular to means for creating a process microclimate. The known working chamber for a working table, comprising a casing with an opening open on one side, a fan with air ducts for supplying air to the chamber in two streams, one of which is horizontal, is located above the plane of the working table, and the other is vertical. air distributors with filters and exhaust grids, installed respectively at the points of entry and oiBO and located in the walls of the casing, a drawing chamber connected to the exhaust grids, and dampers for adjusting the amount of supplying f-joro and exhaust air L, the disadvantage of this pshitriochnogo camera is the low reliability of protection of the working volume of the chamber from penetration into it; particles from the air and safety of working from exposure to toxic substances used or separated in the chamber when performing technological operations, as it cannot eliminate the negative impact on the operation of the protective air curtain of such random factors as through the workplace where the table is located, barometric pressure changes, etc. The aim of the invention is to increase the reliability of protection of the working volume of the chamber from the penetration of dust particles from the surrounding air into it and to protect the worker from the effects of toxic substances studied or released in the chamber during the technological operations. that in a dustproof chamber for a working table containing a casing with an opening open on one side, a fan with air ducts for supplying air to the chamber in two streams, one of which is horizontal located above the plane of the working table and the other is vertical in the plane of working opening air diffusers with filters and shutter grids installed respectively at the air inlet and outlet places and placed on the walls of the case, a draft chamber, connected to the General grilles, and a slab for adjusting supply amount and exhaust air are provided with cellular spun mL casing guide bars connecting the working volume with vkeshney medium and placed in the open opening 1loskosti across vglsote its sides with an exhaust grille horizontal flow, the axes of the cells of the lattice perpendicular to the plane of the open aperture. At the same time, the dampers are made in the form of a perforated gate installed with the possibility of moving along a perforated base, equipped with a cellular one in the health distribution grid, the perforation holes of the base being coaxial with the honeycomb of the air distribution grid, Figure 1 shows the dust-proof chamber, general view in Figure 2 - section A- And figure 1 °; Fig. 3 is a section bb in Fig. 1, fig. 4 is a section B-B in Fig. 2, Fig. 5 is a flap, section. A desktop working chamber contains a case 1 with one side open. opening 2, fan 3 with air ducts 4 and 5 for supplying air to the chamber in two streams, one of which is horizontal is located “hell with the plane of the working table 6, and the other vertical is located in the plane of the working stage two of opening 2, air distributors 7 and 8 s filters 9 and 10 and exhaust grids 11 and 12, installed respectively at the air intake and exhaust points and placed in the walls of the casing 1, the exhaust chamber 13 connected to the exhaust grids 11 and 12 and the dampers 14-18 for controlling the amount of air supplied and exhausted. At the same time, the casing 1 is provided with a honeycomb spraying grille 19 connecting the working volume with the external medium and placed in the plane of the open aperture 2 along its entire height from the side of the extracting grill 11 of the horizontal flow, and the axes of the honeycomb of the grille 19 are perpendicular to the plane of the open aperture 2 The flaps 14-18 are made in the form of a perforated gate 20 mounted for movement along a perforated base 21 provided with a cellular air distribution grill 22, and the perforations of the base 21 are coaxial with the honeycomb duhoraspredelitelnoy grating 22. The table 6 mounted on supports 23. In front of the suction fan 3, a filter 24 GRU bout purification. The fan 3 communicates with the duct 4 of the horizontal flow and with the duct 5 of the vertical flow through the pressure chamber 25 Under the working surface of the table 6 there is a branch pipe 26 of the outlet, communicating with the exhaust chamber 13. At the entrance to the ducts 5 and 4, regulating passageways are fixed flap sections 14 and 15. The air inlet duct 12 is equipped with an adjusting flap 18, and an exhaust chamber 13 with flaps 16 and 17, the flap 16 being installed in the place of the horizontal and vertical flows and the flap 17 - at the inlet of the mixed flow in the outlet pipe 26. The coarse filter 24 is made of polyurethane foam, and the 9 and 1 fine filters are combined with air distributors 7 and 8 and are made of OP fabric. The camera operates in the following way. To bring the camera into working condition, the fan of the fan 3 is activated and the system is switched off from 1 34 and air from the chamber (not shown). The air supplied by the fan 3 under some overpressure enters the pressure chamber 25. Part of the air through the air duct 4 through the filter 9 and the air distributor 7 enters the cavity of the casing 1. Under the influence of the vacuum generated by the air exhaust system, the air supplied to the cavity of the casing 1 passes through The working part (remote from the open opening 2) of the cavity of the casing 1 is in the form of a laminar horizontal flow and exits through the exhaust grate 11 to the exhaust chamber 13, from where it is sucked into the system through the outlet pipe 26 to drain and air. The remaining part of the air in the pressure chamber 25 through the duct 5 enters the upper filter 10 and the air distributor 8, is distributed over the entire width of the open opening 2, forming in this opening an air flow moving from top to bottom towards the exhaust grate 12 located in the lower part open aperture 2. Under water: sg, by the action of the vacuum created by the air exhaust system, the dial; The air flow enters the air outlet grate 12 into the exhaust air through the chamber 13 and then through the branch pipe 26 to the air exhaust system. Thus, in the open opening 2 of the casing 1, an overhead of air is created, forming a curtain of this opening, preventing the movement of both air from inside the cavity of the casing 1 and air of the cavity of the casing 1 to the room. In the course of the camera operation, through the honeycomb junction of the lattice 19, which is located in the plane of the open opening 2 directly at the starting grid 11, air is introduced into the cavity of the housing 1 from the room. Air enters under the influence of rarefaction 1i, which is present in this chamber zone. The volume of air discharged through the exhaust grille 11 is controlled in such a way that all the air supplied through the honeycomb spraying grille 19 is discharged into the grill 11 without mixing in the cavity 1 with the horizontal air flow between the air spreader divider 7 and the exhaust grille 11.

The design of the dust-proof chamber allows for balancing the pressures of the surrounding air chamber and the air flow 5 being located in the cavity of the casing. When random changes in barometric conditions in the room where the camera is installed, change accordingly to one or the other side, the amount of air drawn into the cavity of the casing 1 through the sieve 19, without adversely affecting the performance of the air curtain in the open casing opening.

Placing the cellular spraying grating in the plane of the open opening from the B & THEN horizontal grid flow ensures that air flows from the room directly to the exhaust grating, i.e. to the place of the housing cavity, from which it is immediately removed from the chamber. what

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eliminates the possibility of dust particles entering the zone of the chamber where technological operations are carried out. In addition to the jet-luminal character of the flow of air drawn in, it prevents the oncoming movement of harmful impurities from the chamber into the room.

The implementation of the dampers with base axes coaxially with the honeycomb air distribution grilles provides a high stability of the laminar nature of the air flow around the housing casing with a wide range of flow throttling in the control dampers.

The proposed dust-proof chamber ensures that the objects in the chamber and the worker performing the technological operations are protected from dust from exposure to toxic substances in the chamber.

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Claims (2)

'1. DUST PROTECTION CAMERA FOR THE DESK, containing a casing with an opening open on one side, a fan with air ducts for supplying air into the chamber in two streams, one of which is horizontal, located above the plane of the work table, and the other, vertical, is located in the plane of the working opening, air distributors with filters and exhaust grilles installed respectively in the places of air inlet and outlet and placed in the walls of the casing, an exhaust chamber connected to the exhaust grilles, and dampers for controlling the amount of air supply and exhaust, characterized in that, in order to increase the reliability of protecting the working volume of the chamber from dust particles from the ambient air and protecting the worker from exposure to toxic substances used or released in the chamber during technological operations, the casing is equipped with a cellular a straightening grating 'connecting the working volume to the external environment and placed in the plane of the open opening along its entire height from the exhaust side of the horizontal flow, and The grids are perpendicular to the plane of the open opening. 2. The chamber according to claim 1, characterized in that the shutters are made in the form of a perforated gate installed to move along a perforated base equipped with a honeycomb air distribution grill, the perforation holes of the base being aligned with the honeycomb air distribution box.