초록 ▼

The operative within a work cab is protected from a polluted atmosphere by provision on the cab of an air pressurizer/conditioner which comprises an air treatment unit and a turbo-fan assembly. The air treatment unit (12) takes the general form of a parallelepipedic box having on one of its front fa

The operative within a work cab is protected from a polluted atmosphere by provision on the cab of an air pressurizer/conditioner which comprises an air treatment unit and a turbo-fan assembly. The air treatment unit (12) takes the general form of a parallelepipedic box having on one of its front faces a suction orifice 10a extending over the greater part of this face to allow access to the front face of the coarse filter element (15) and to the front face of the fine filter element (16), these said faces being attached mechanically and without a leak to an intermediate leak-proof frame. The turbo-fan assembly (19) is located inside the box downstream of the filter elements (15, 16 and 17) so that the air passes through the said filter elements as a result of suction and is delivered purified into the working cab (11) through a diffuser (24). A pressurizer is provided with a pressurization monitoring device and a toxicity detector (32) for the air forced into the cab.

대표청구항 ▼

Air pressurizer/conditioner for work cabs in a polluted atmosphere, especially the driving cabs of agricultural tractors, this equipment comprising an air treatment unit mounted or built into the roof of a cab, this unit being equipped on the inside with at least one coarsefilter element for elimina

Air pressurizer/conditioner for work cabs in a polluted atmosphere, especially the driving cabs of agricultural tractors, this equipment comprising an air treatment unit mounted or built into the roof of a cab, this unit being equipped on the inside with at least one coarsefilter element for eliminating the solids, such as tree leaves and grit, a fine filter element, for dust removal and an activated-charcoal cell for stopping the harmful gases and vapours by absorption, and finally a turbo-fan assembly for sucking in the outside air and conveying it, filtered and purified, to the working cab, this air pressurizer/conditioner being characterized in that, on the one hand, the air treatment unit takes the form of a box, preferably the general form of a parallelepipedic box, which has, on one of its front faces a suction orifice extending over the greater part of this face to allow access to the front face of the coarse filter element and to the front face of the fine filter element, these said faces being attached mechanically and without a leak to an intermediate leakproof frame, in that, on the other hand, the turbo-fan assembly is located inside the box downstream of the filter elements so that the air passes through the said filter elements as a result of suction and is delivered purified into the working cab through a diffuser, and further in that the pressurizer is provided with a pressurization monitoring device and a toxicity detector for the air forced into the cab, characterized in that the pressurization and toxicity monitoring device comprises, on the one hand, a differential pressure controller having a pressure intake in the cab and a pressure intake outside the cab, this pressure controller feeding a pressurization indicator in the cab, and, on the other hand, a pulse counter associated with a divider bridge having as many ratios as the turbo-fan assembly has flow speeds, this counter displaying, in corrected time, the effective working time of the chemical filter as a function of the flow speeds of the turbo-fan, and further a toxicity detector incorporating, on a replaceable support located in the path of the air forced into the cab, several reagent pellets which by a change of colour reveal, from a certain threshold, the presence of polluting chemical bodies.