A ventilator unit for ventilating the inside of a garment such as a pressure suit or the like with an ambient fluid, the unit being characterized by the fact that it comprises:
- a first leaktight case (1) having at least one inlet opening (2) suitable for sucking in said fluid, and an outlet opening (3), and also a first electrical connection passage (4);
- a filter cartridge (5);
- means (6) for mounting the filter cartridge (5) in association with the inlet opening (2) of the first case (1);
- an impeller (7) having at least one inlet port (8) for sucking in said fluid contained in said first case (1), and an outlet orifice (9) for delivering said sucked-in fluid, said impeller (7) having a drive motor (10) controllable via a power supply input (11);
- means (12) for mounting said impeller (7) in the inside (13) of the first case (1);
- a duct (14) for connecting the outlet orifice (9) of the impeller (7) to the outside (15) of the first case (1), said duct (14) passing in leaktight manner through the outlet opening (3) of the first case (1);
- a second case (20);
- a second electrical connection passage (21) made through the wall (49) of said second case (20);
- a source (23) suitable for delivering electrical energy to an output terminal (24), said source (23) being disposed in the inside (25) of the second case (20);
- an electronic control circuit (26);
- means (27) for associating the first and second cases (1, 20) in such a manner that the first and second electrical connection passages (4, 21) form a single leakproof third electrical connection passage (28);
- a flow meter (29) disposed inside the duct (14), said flow meter having an outlet (30) suitable for delivering an electrical signal representative of the flow rate of fluid passing along the duct (14);
- a first electrical connector (31) for connecting the output (30) of the flow meter (29) to a first input (32) of the electronic control circuit (26);
- a second electrical connector (33) for connecting a first control output (34) of the electronic control circuit (26) to the control input (11) of the motor (10) for driving the impeller;
- and
- a third electrical connector (35) for connecting the electrical energy source (23) to a power supply input (36) of the electronic control circuit (26);
- said electronic control circuit (26) further including an output (37) suitable for delivering a first alarm signal when the level of electrical energy delivered by said source (23) drops below a determined threshold value, a converter controllable from a control input (51), said converter being adapted to transform an electrical signal into a sound signal;
- and a fifth electrical connector (52) for connecting the control terminal (51) of the converter (50) to that output (37) of the electronic control circuit that is adapted to deliver said first alarm signal, said converter (50) being situated in said duct (14) so that the converter (50) is directly inside the fluid flowing in the duct.