Axial-flow blower arrangement

Abstract

An axial-flow blower arrangement for the condenser ( 28 ) of a roof-mounted air conditioning installation including two evaporator units ( 3, 4 ) and a condenser unit ( 2 ) arranged between them comprises at least two blower modules ( 1 ), each of which has a box-shaped downwardly open hood ( 10 ) which has a cover wall ( 12 ) and walls ( 14, 15, 16, 17 ) which in the mounted condition extend downwardly from the cover wall and which together with the cover wall enclose an air suction chamber ( 26 ), out of which an axial-flow blower ( 23 ) mounted under the cover wall sucks air and discharges it into the atmosphere through an air outlet opening ( 20 ). The walls of the air suction chamber of each blower module extend in the mounted condition so far downwardly to the horizontally lying condenser ( 28 ) which completely covers over the open underside of the hood ( 10 ) and so terminate with the condenser that under the action of the axial-flow blower only air which has previously passed through the condenser can pass into the air suction chamber of the blower module.

1 . An axial-flow blower arrangement for the condenser unit ( 2 ) of an air conditioning installation to be mounted on a vehicle roof ( 8 ), which includes two evaporator units ( 3 ,  4 ) which in the mounted condition are arranged to the left and the right of the condenser unit ( 2 ) in the direction of travel, wherein the axial-flow blower arrangement comprises at least two blower modules ( 1 ) which are arranged in succession in the direction of travel and each of which has a carrier plate which extends horizontally in the mounted condition and at the underside of which is mounted a respective axial-flow blower ( 23 ) which discharges air sucked in from below into the atmosphere through an air outlet opening ( 20 ) in the carrier plate,
 characterized in that   the carrier plate of each blower module ( 1 ) is the cover wall ( 12 ) of a box-shaped downwardly open hood ( 10 ) which has walls ( 14 ,  15 ,  16 ,  17 ) which extend from the cover wall ( 12 ) and which extend downwardly in the mounted condition and which together with the cover wall ( 12 ) respectively enclose an air suction chamber ( 26 ) of the blower module ( 1 ) in question, out of which the associated axial-flow blower ( 23 ) sucks air, and   the walls ( 14 ,  15 ,  16 ,  17 ) which delimit the air suction chamber ( 26 ) of each blower module ( 1 ) extend in the mounted condition so far downwardly to a horizontally lying condenser ( 28 ) completely covering the open underside of the hood ( 10 ) and so terminate with the condenser that under the action of the axial-flow blower ( 23 ) only air which has previously passed through the condenser ( 28 ) can pass into the air suction chamber ( 26 ) of the blower module ( 1 ).   
     
     
         2 . An axial-flow blower arrangement as set forth in  claim 1  characterized in that the at least two blower modules ( 1 ,  1 ) at the lower end regions of the walls ( 14 ,  15 ,  16 ,  17 ) of the air suction chamber ( 26 ) have holders for the common condenser ( 28 ) extending in the direction of travel. 
     
     
         3 . An axial-flow blower arrangement as set forth in  claim 1  characterized in that the cover wall ( 12 ) of each hood ( 10 ) is of a substantially rectangular shape and that a front and a rear wall ( 16 ,  17 ) and two side walls ( 14 ,  15 ) of the air suction chamber ( 26 ) extend downwardly from said cover wall ( 12 ) in the mounted condition as viewed in the direction of travel. 
     
     
         4 . An axial-flow blower arrangement as set forth in  claim 3  characterized in that the cover wall ( 12 ) of the hood of each blower module ( 1 ) has shoulders ( 34 ,  35 ) which project beyond the two side walls ( 14 ,  15 ) of the air suction chamber ( 26 ) and each of which adjoins in the mounted condition one of the outside walls ( 37 ,  38 ) of the evaporator units ( 3 ,  4 ) and with same and the outside of the associated side wall ( 14 ,  15 ) of the air suction chamber ( 26 ) encloses an air flow passage ( 40 ,  41 ) leading from an air intake opening in the shoulder ( 34 ,  35 ) to a downwardly disposed air outlet which opens into an air collecting chamber ( 32 ) beneath the horizontally lying condenser ( 28 ). 
     
     
         5 . An axial-flow blower arrangement as set forth in  claim 4  characterized in that the lower boundary of the air collecting chamber ( 32 ) is formed by the top side of the vehicle roof ( 8 ). 
     
     
         6 . An axial-flow blower arrangement as set forth in  claim 4  characterized in that each of the air intake openings is covered by a grill ( 42 ,  43 ) integrated into the cover wall ( 12 ) of the hood ( 10 ). 
     
     
         7 . An axial-flow blower arrangement as set forth in  claim 1  characterized in that the hood ( 10 ) of each blower module ( 1 ) includes a plurality of stiffening means ( 45 ) which are provided integrally in the air suction chamber ( 26 ) and connect the cover wall ( 12 ) of the hood ( 10 ) to the walls ( 14 ,  15 ,  16 ,  17 ) of the air suction chamber ( 26 ). 
     
     
         8 . An axial-flow blower arrangement as set forth in  claim 1  characterized in that the hood ( 10 ) of each blower module ( 1 ) includes a plurality of connecting carrier elements ( 46 ) provided integrally in the air flow passages ( 40 ,  41 ). 
     
     
         9 . An axial-flow blower arrangement as set forth in  claim 1  characterized in that in the mounted condition the lateral outside walls ( 37 ,  38 ) of the respective hood ( 10 ) of the blower modules ( 1 ) are connected to the evaporator units ( 3 ,  4 ) for self-supportingly holding the axial-flow blower arrangement so that the air collecting chamber ( 32 ) under the condenser ( 28 ) is free from structural elements which could reduce its cross-section. 
     
     
         10 . An axial-flow blower arrangement as set forth in  claim 1  characterized in that the condenser ( 28 ) is a thin aluminum multi-port condenser.