FR3066931A1 - SORBONNEL FRONT FACADE AUTOMATIC CLOSURE SYSTEM AND LABORATORY ENCLOSURES - Google Patents

Abstract

System and method for automatically closing the mobile facades of extraction air equipment, in particular hoods and laboratory enclosures, associated with a device for reducing the flow of extracted air.

Description

AUTOMATIC CLOSING SYSTEM OF SORBONNE FRONT FACADE AND LABORATORY ENCLOSURES ASSOCIATED WITH A DEVICE FOR REDUCING THE EXTRACTED AIR FLOW.

Applicant: Bertaux Claude Société ABC.

Inventor: Bertaux Claude

System and method for automatically closing the movable facades of air extraction equipment, in particular hoods and laboratory enclosures, which can be combined with a device for reducing the flow of extracted air.

The present invention relates to a system for automatically closing the movable facades of aeraulic extraction equipment called fume cupboards Hoods or enclosures, used to protect laboratory workers against clearances and splashes due to handling of toxic and corrosive products. Fig -1

The protection conferred by a fume cupboard or enclosure is obtained by the suction of stale air from chemical reactions and the products used, these enclosures serve to confine the pollutants and to reject them towards the outside of the laboratory.

Fume cupboards are made up of a table or bench top with 2 side panels, a collection roof and a movable front in transparent material moving vertically according to handling needs.

For Normative and safety reasons the fume cupboards must be used to the maximum in operation with the front window down. Most fume cupboards have Variable flow with a reduction in the flow of extract air from the moving ice.

The energy consumption of fume cupboards is important, they reject heated or cooled air extracted in the laboratory outside. The amount of air necessary for the protection of the user can be reduced by 3 when the facade is lowered to the minimum opening. Users frequently forget to lower the movable facades.

The automatic closing systems of the Sorbonne exist, they use electric motors with up and down installed also on roller shutters of windows, blinds, pool covers ...

These systems are very expensive, difficult to implement and require periodic adjustments. They are also complicated to install on the existing Sorbonne fleet, which must be modernized to reduce toxic discharges, energy consumption and user safety.

Pagel

The above-mentioned objectives are obtained by releasing the descent of the movable glass within a given time after the user has moved away by liberating the action of the electromagnet.

The system includes a presence detector connected to a magnetic balancer installed on the counterweight system of the movable facade. Fig-2

The counterweight of the facade is less than the weight of the latter so as to allow the free descent of the latter. The balance of maintenance of the facade is achieved by a fixed electromagnet which exerts a force on a disc fixed on one of the pulleys or around the counterweight.

The electronic circuit located on the front of the Sorbonne comprises the presence detector (ll), a regulating member of the magnetic system to which it is connected, and an electronic pusher to block the movable glass in position (13).

It includes a voltage regulator to adjust the value of the counterweight (12), and a time delay

Adjustable counterweight release electronics.

The system allows by the addition of a cell to detect an object in the passage of the movable glass and allows to block it in position (15).

The addition of a position sensor on the glass makes it possible to reduce the flow of air extracted in the Sorbonne according to the opening height of the movable facade (16). The air flow will be reduced by action on a frequency converter for adjusting a fan motor or a motorized shutter for adjusting the air flow.

The addition of a motion sensor on the disc (17) of the electromagnetic compensator makes it possible to trigger the magnetic balancer only after a movement of the movable front in order to optimize the energy consumption of the system in the event of accidental presence user.

Claims (4)

CLAIMS. 1-Automatic closing system of the front of Sorbonne or laboratory hood, by electromagnetic compensation of the counterweight characterized in that this system comprises: -An electromagnetic compensation of the counterweight by adjustable electromagnet (10) -A presence detector in front panel that detects user presence (11) -a voltage regulator to adjust the value of the counterweight (12) -Adjustable electronic timing for counterweight release - an electronic push button on the circuit to lock the movable front in position. (13) 2-System according to the preceding claim characterized in that it allows by the addition of a cell to detect an object in the passage of the movable glass and allows to block it. in position (15) 3-System according to claim 1 characterized in that it allows by the addition of a position sensor on the ice to reduce the flow of air extracted in the Sorbonne depending on the height of the movable facade. The air flow will be reduced by action on a frequency variator for adjusting a fan motor or a motorized shutter for adjusting the air flow. (16) 4-System according to the preceding claims characterized by the addition of a motion sensor on the disc (17) in order to trigger the magnetic balancer only after a movement of the movable front in order to optimize the energy consumption of the system in case of accidental user presence.