Improved multistage rinsing module for tunnel dishwashers, and a tunnel dishwasher provided with such a module

Multistage rinsing module (10) for tunnel dishwashers (100) of the type comprising in succession from upstream to downstream following the movement of the dishes three independent zones, respectively: - a draining zone (11) of the dishes full of detergent supplied in said module (10), - a pre-rinsing zone (12) of said drained dishes, - a final rinsing zone (13) of said drained and pre-rinsed dishes; wherein - said final rinsing zone (13) being provided with rinsing nozzles (14) for delivering net water (15); - said pre-rinsing zone (12) being provided with pre-rinsing nozzles (16) for delivering a pre-rinsing solution (17); said pre-rinsing solution (17) consisting exclusively of the net water (15) delivered by said rinsing nozzles (14) and the substances removed from the dishes; - said draining zone (11) being provided with draining nozzles (19) for delivering the draining solution (20); said draining solution (21) consisting exclusively of the pre-rinsing solution (17) delivered by said pre-rinsing nozzles (16) and the substances removed from the dishes; said draining nozzles (19) being configured so as to deliver said draining solution (20) at a flow-rate and a speed that are greater with respect to the pre-rinsing solution (17) and to the net water (15) delivered by said pre-rinsing nozzles (16) and by said rinsing nozzles (14).