Patent GB-1474538-A (GB)
Title: Silencing housing for a machine plant
IPC: F02B77/13
Filed: 1974-08-19
Abstract: 1474538 Machine casings ATLAS COPCO AB 19 Aug 1974 [27 Aug 1973] 36348/74  Heading F1B The invention relates to a silencing housing for a machine plant comprising at least one external cooler, the housing comprising two side walls 12, 13 a floor 11 and a roof 10 so as to completely surround the plant. The housing is divided by a partition 17 into a primary chamber 18, in which the machine plant 20 is mounted, and a secondary chamber 19 which communicates with the primary chamber 18 through an opening 31 in the partition, and within which the cooler 21 is disposed. The primary chamber 18 is formed with an air inlet opening 15 in the end-wall 13 having a wall 25 disposed adjacent thereto to form a sound trap. Similarly the secondary chamber 19 is formed with an air inlet opening 14 in the end-wall 12 having a wall 24 disposed adjacent thereto to form a sound trap. An air outlet opening 23 is formed in the roof 10 to extend from the secondary chamber 19, the opening 23 being so associated with the partition wall 17 to form a sound trap. A double-sided fan is located in the secondary chamber 19 being driven by the machine 20 through a shaft 30 which extends through the opening 31. The fan draws air in through inlet 14, the air flowing through the cooler 21, through the fan and thence out of the chamber 19 through outlet 23, as shown by solid arrows. The fan also draws air in through inlet 15, the air flowing through opening 27 in the wall 25, through the primary chamber 18, through the opening 31 in the partition 17, through the fan 22 thence through the secondary chamber 19 and out through the outlet 23. The machine 20 is connected to the cooler 21 by pipes 28, 29 which pass through the partition 17. In Fig. 2 a single sided fan 22 is utilized and an opening 40 is formed in the partition 17 for passage of the cooling pipes 28, 29, also for flow of air from the primary chamber 18 to the secondary chamber 19. The air passing from the primary chamber to the secondary chamber unites with air passed through the cooler 21 to flow through the fan 22 thence through secondary chamber 19 to outlet 23. In Fig. 3 the machine comprises an engine driven compressor, the engine being indicated at 39a and being provided with a cooler 51, and the compressor 40 having a cooler 41 again disposed in the secondary chamber 19. The engine cooler 51 is disposed in a tertiary chamber 50 formed by a further wall 54; a fan 22 is again located in the secondary chamber 19, while a further fan 57 is located in the tertiary chamber 50. The fan 57 draws air through openings 15 and 27 and discharges it through the cooler 51 and then through a second outlet 56 to atmosphere. The fan 22 also draws air through openings 15 and 27 and opening 55 in the further wall 54, into the primary chamber 18, the air then passing through opening 31 in the partition 17 into the secondary chamber 19, both this air and the air drawn in through inlet 14 passing through the cooler 41 and thence through outlet 23. In a further embodiment the engine is air-cooled, air passing through inlet 15, through an opening (62) in the wall 25 to the air cooling system of the engine, the air then discharging through the tertiary chamber 50 and outlet 56 to atmosphere. Further air from the inlet 15 passes through the opening 27 in the wall 25 into the primary chamber 18 thence through an opening 31  in the partition 17 to the secondary chamber 19 as in Fig. 3.