1. A fan unit for a ventilator, comprising:
a housing defining a suction channel as part of a suction area;
a motor having a stator and a rotor, with the stator being affixed to the housing;
the suction area extending helically about the motor axis; the suction area being arranged such that the sucked air is accelerated in the direction of rotation of the motor and an impeller affixed to the rotor, the motor being positioned in the suction area of the impeller.
2. The fan unit according to claim 1, wherein the motor defines the inner limitation of a suction ring as part of the suction area and the housing defines the outer limitation of the suction ring.
3. The fan unit according to claim 2, wherein a tissue is fixed in the transition region between the suction channel and the suction ring.
4. The fan unit according to claim 1, wherein the motor partially projects into the suction channel and thus partially defines an inner wall of the suction channel.
5. The fan unit according to claim 1, wherein the suction channel extends about the rotational axis of the motor over an angle sector of 2500 to 3300 in an arc-shaped manner.
6. The fan unit according to claim 1, wherein the housing further comprises a pressure space through which the air flows after its compression by the impeller, wherein the pressure space is separated from the suction channel by a truncated-cone-shaped partition wall so that the cross-sections of the suction channel and the pressure space in a plane comprising the motor axis are approximately equally large.
7. The fan unit according to claim 1, wherein there is no plane perpendicular to the motor axis and simultaneously intersecting the blades of the impeller and the housing opening to a blow-off port.
8. The fan unit according to claim 1, wherein the housing in the proximity of the fixtures of the stator is formed such that it acts as a spring element itself.
9. The fan unit according to claim 8, wherein the spring element surrounds the fixtures in a circular form and the cross-section of the spring element in a plane comprising the motor axis is waved.
10. The fan unit according to claim 1, wherein the stator is affixed to the housing by means of spring and damping elements.
11. The fan unit according to claim 1, wherein a suction port is affixed on the outside of the housing and a tissue is fixed in the transition region between the suction port and the suction channel.
12. The fan unit according to claim 1, further comprising a tissue through which the air flows after its compression by the impeller.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. Apparatus for after-treatment exhaust gas in the exhaust gas train of a lean-burn internal combustion engine, the exhaust gas train having an input and an output, the apparatus comprising:
an NOx storage catalyzer installed in the exhaust gas train, the catalyzer having at least one storage component for storing nitrogen oxides during lean operating phases and at least one active component for reducing stored nitrogen oxides during rich operating phases;
a molecular sieve arranged upstream of the NOx storage catalyzer, the molecular sieve having free passages therethrough with a diameter between 3 \u212b and 6 \u212b, and thereby preventing sulfur dioxide from reaching the catalyzer; and
a catalyzer for the oxidation of hydrocarbons arranged upstream of the molecular sieve.
2. The apparatus of claim 1 wherein the molecular sieve is a molecular sieve layer on the NOx storage catalyzer.
3. An apparatus for after-treatment exhaust gas in the exhaust gas train of a lean-burn internal combustion engine., the exhaust gas train having an input and an output, the apparatus comprising:
an NOX storage catalyzer installed in the exhaust gas train, the catalyzer having at least one storage component for storing nitrogen oxides during lean operating phases and at least one active component for reducing stored nitrogen oxides during rich operating phases;
a molecular sieve arranged upstream of the NOx storage catalyzer the molecular sieve preventing sulfur dioxide from reaching the catalyzer; and
a carrier arranged upstream of the NOx storage catalyzer, the molecular sieve being provided as a molecular sieve layer on the carrier.
4. The apparatus of claim 3 further comprising a catalyzer for the oxidation of hydrocarbons arranged upstream of the molecular sieve.
5. The apparatus of claim 4 wherein the NOx storage catalyzer, the molecular sieve layer, and the catalyzer for the oxidation of hydrocarbons are fixed to each other and cannot be separated without being destroyed.
6. The apparatus of claim 4 further comprising a particulate filter, wherein at least one of the NOx storage catalyzer, the molecular sieve layer, and the catalyzer for the oxidation of hydrocarbons are arranged on the particulate filter.
7. The apparatus of claim 3 wherein the molecular sieve has free passages therethrough with a diameter between 3 \u212b and 6 \u212b.
8. The apparatus of claim 1 wherein the at least one active component contains at least one of platinum, palladium, ruthenium, barium, rhodium, and calcium.
9. The apparatus of claim 1 wherein the at least one storage component and the at least one active componet are embedded in a zeolite.
10. The apparatus of claim 9 wherein the zeolite is at least one of types MFI, BEA, and FAU.
11. The apparatus of claim 1 wherein the molecular sieve comprises at least one of zeolites, silicates, metal silicates, aluminates, metal aluminates, silicophosphates, metal silicophosphates, silicoaluminophosphates, aluminophosphates, metal aluminophosphates, and aluminum silicates.
12. The apparatus of claim 1 wherein the molecular sieve has lattice structures of at least one of types EDI, ABW, AEI, AFR, AWW, BIK, CHA, \u2014CLO, KFI, LTA, NAT, PAU, RHO, \u2014RON, THO, AFT, ATT, ATV, BRE, CAS, \u2014CHI, DAC, DDR, GIS, GOO, HEU, JBW, LEV, MON, PHI, WEN, YUG, APC, EAB, EPI, ERI, EUO, FER, LAU, MEL, MER, MFI, MFS, MTT, MTW, NES, and TON.
13. The apparatus of claim 1 wherein the molecular sieve comprises zeolites of at least one of types edingtonite, Li-A, bikitaite, chapazite, cloverite, ZK-5, zeolite A, natrolite, paulingite, roggianite, thomsonite, brewsterite, chiavennite, dachiardite, gismondine, goosecreekite, heulandite, Na-J, levyne, montesommaite, phillipsite, wenkite, yugawaralite, TMA-E, epistilbite, erionite, EU-1, ferrierite, laumontite, ZSM-11, merlionite, ZSM-5, ZSM-57, ZSM-23, ZSM-12, NU-87, and theta-1.
14. The apparatus of claim 1 wherein the molecular sieve comprises aluminophosphates of at least one of types AIPO-18, AIPO-22, AIPO-52, AIPO-12-TAMU, AIPO-25, and AIPO-C.
15. The apparatus of claim 1 wherein the molecular sieve comprises silicoaluminophosphate SAPO-40.
16. The apparatus of claim 1 wherein the molecular sieve has oxidation activity for hydrocarbons.
17. The apparatus of claim 1 wherein at least one of the molecular sieve and the catalyzer for oxidation of hydrocarbons contain at least one of palladium, ruthenium, iridium, tungsten, titanium, lanthanum, molybdenum, cerium, manganese, vanadium, and rhodium.
18. The apparatus of claim 1 wherein the molecular sieve has a concentration of at least one active component for the oxidation of nitrogen monoxide that is lower than the concentration of said at least one active component in the NOx storage catalyzer.
19. The apparatus of claim 18 wherein the catalyzer has a concentration of platinum that is higher than the concentration of platinum in the molecular sieve layer.
20. The apparatus of claim 1 wherein the molecular sieve layer has a concentration of at least one of palladium, ruthenium, iridium, tungsten, titanium, lanthanum, molybdenum, cerium, manganese, vanadium, and rhodium that is higher than the concentration of at least one of palladium, ruthenium, iridium, tungsten, titanium, lanthanum, molybdenum, cerium, manganese, vanadium, and rhodium in the catalyzer.
21. The apparatus of claim 1 further comprising a particulate filter having an outlet side, wherein the molecular sieve layer is arranged on the outlet side.
22. The apparatus of claim 1 wherein the molecular sieve has a thickness between 3 \u212b and 5 \u03bcm.