Ventilation system providing nbc protection

• US 20070017510A1
• Filed: 05/19/2004
• Published: 01/25/2007
• Est. Priority Date: 05/22/2003
• Status: Active Grant

• Current Assignee: Andair AG
• Original Assignee: Andair AG
• Inventors: Riedo, Hans
• Granted Patent: US 7,527,663 B2
• Time in Patent Office: Days
• US Class Current: 128/201.250
• CPC Class Codes: A62B 13/00 Special devices for ventilating gasproof shelters ventilating in general F24F
• CPC Class Codes: A62C 4/00 Flame traps allowing passage of gas but not of flame or explosion wave
• CPC Class Codes: Y10S 454/902 Air raid shelter ventilation

Abstract

A ventilation system providing NBC protection for at least one closed security space and/or protection space with constant slight excess pressure, the ventilation system substantially having an air inlet and air outlet, an explosion protection valve, a prefilter, a filter for suspended matter, an activated carbon filter and an air conveying device for sucking in the air to be purified and for distributing the purified air, and wherein the ventilation system has at least one of the three following built-in elements: an explosion protection valve which is combined with and cooperates with the prefilter; a combined activated carbon filter made of activated carbon which is specifically effective against biological and/or chemical toxic substances, on the one hand and, on the other hand, against radionuclides; and an air pump configured as a double bellows.

Claims

1. Ventilation system (10) providing NBC protection for at least one closed security space and/or protection space (12) with constant slight excess pressure, which ventilation system (10) substantially comprises an air inlet (16) and air outlet (18), an explosion protection valve (28), a prefilter (26), a filter (38) for suspended matter, an activated carbon filter (40) and an air conveying device for sucking in the air to be purified and for distributing the purified air, characterised in that the ventilation system (10) comprises at least one of the three following built-in elements:

an explosion protection valve (28) which is combined with and cooperates with the prefilter (26);

a combined activated carbon filter (40) made of activated carbon which is specifically effective against biological and/or chemical toxic substances, on the one hand and, on the other hand, against radionuclides;

an air pump configured as a double bellows (52).

2. Ventilation system (10) according to claim 1, characterised in that the explosion protection valve (28) combined with the prefilter (26) comprises an impact-resistant plate (30) having a first perforation (32), rigidly mounted prior to the filter (38) for suspended matter, a prefilter pad (26) which can be elastically compressed and is held upstream from this stationary plate (30) and a moveable plate (34) having a second perforation (36), which can be displaced in the direction (L) of the stationary plate (30), wherein the first and second perforation (32, 36) are not congruent in the event of striking together due to an explosion and form an air closure.

3. Ventilation system (10) according to claim 1, characterised in that the explosion protection valve (28) combined with the prefilter (26) is held in a housing cover (17) which is reinforced relative to the remaining housing (14).

4. Ventilation system (10) according to claim 1, characterised in that the explosion protection valve (28) combined with the prefilter (26) is integrated in a housing (14) of an autonomous built-in unit in the interior of the space.

5. Ventilation system (10) according to claim 1, characterised in that the activated carbon filter (40) comprises a first layer (42) as a C filter and a second layer (44) as an N filter, each layer (42, 44) being effective in any sequence specifically against chemical warfare agents or against radionuclides.

6. Ventilation system (10) according to claim 1, characterised in that the activated carbon filter (40) comprises a multifunctional layer made of activated carbon which is effective specifically against chemical gaseous toxic substances and an activated carbon which is effective specifically against radionuclides ejected into the atmosphere.

7. Ventilation system (10) according to claim 5, characterised in that the layers (40, 42, 44) are granule-like, powder-like or configured as an open-pored structure.

8. Ventilation system (10) according to claim 1, characterised in that the filter (38) for suspended matter and the activated carbon filter (40) are disc-shaped with an axial through-flow direction or annular with a radial through-flow direction.

9. Ventilation system (10) according to claim 1, characterised in that a power-driven ventilator (46), also fitted with a silencer (50) is used for conveying air in normal operation and the double bellows (52) can be flanged on in the event of a power failure or defect.

10. Ventilation system (10) according to claim 1, characterised in that the double bellows (52) comprises a suction chamber (56) mounted on the housing (14) and having an air inlet connection piece (62) for filtered air, two variable air chambers (58, 60) arranged on the end face, each having a suction valve (66, 68) and an outlet valve (74, 76) for alternating actuation, and an operating handle (54) for the double bellows (52).