US 11,788,524 B2
Cooling arrangement and method for cooling an at least two-stage compressed air generator
Frank Georg Klaus, Zell-Barl (DE); Ulrich Thomes, Kulz (DE); and Marc Schiel, Heinzenbach (DE)
Assigned to Gardner Denver Deutschland GMBH, Bad Neustadt (DE)
Appl. No. 17/426,875
Filed by Gardner Denver Deutschland GMBH, Bad Neustadt (DE)
PCT Filed Jan. 24, 2020, PCT No. PCT/EP2020/051751
§ 371(c)(1), (2) Date Jul. 29, 2021,
PCT Pub. No. WO2020/156942, PCT Pub. Date Aug. 6, 2020.
Claims priority of application No. 102019102387.4 (DE), filed on Jan. 30, 2019.
Prior Publication US 2022/0106954 A1, Apr. 7, 2022
Int. Cl. F04B 39/06 (2006.01); F04B 41/06 (2006.01); F04B 53/08 (2006.01); F04C 18/16 (2006.01); F04C 23/00 (2006.01); F04C 29/04 (2006.01)
CPC F04B 39/066 (2013.01) [F04B 39/06 (2013.01); F04B 41/06 (2013.01); F04B 53/08 (2013.01); F04C 18/16 (2013.01); F04C 23/001 (2013.01); F04C 29/04 (2013.01); F04C 2210/221 (2013.01)] 10 Claims
OG exemplary drawing
 
1. An at least two-stage compressed air generator, comprising
a liquid-cooled intercooler disposed between a first compressor stage and a second compressor stage for cooling precompressed air discharged from the first compressor stage before the precompressed air enters the second compressor stage;
a liquid-cooled aftercooler disposed after the second compressor stage for cooling air compressed by the second compressor stage;
a liquid-cooled subassembly cooler for absorbing heat from the compressed air generator;
a coolant circuit including a main cooler having a cold side and a hot side, the cold side configured to feed a cooled coolant having a low temperature respectively to a coolant inlet of the liquid-cooled intercooler, to a coolant inlet of the liquid-cooled aftercooler, and to a coolant inlet of the subassembly cooler in parallel, and the hot side configured to receive heated coolant having a high temperature which exits in parallel respectively at a coolant outlet of the liquid-cooled intercooler and at a coolant outlet of the liquid-cooled aftercooler,
wherein a coolant outlet of the subassembly cooler is connected to at least one of a feed inlet of the liquid-cooled intercooler and a feed inlet of the liquid-cooled aftercooler, wherein the feed inlet of the liquid-cooled intercooler is disposed between the coolant inlet of the liquid-cooled intercooler and the coolant outlet of the liquid-cooled intercooler at a point at which an intermediate temperature of the coolant in the liquid-cooled intercooler is within twenty percent (±20%) of an exit temperature of the coolant at the subassembly cooler, and wherein the feed inlet of the liquid-cooled aftercooler is disposed between the coolant inlet of the liquid-cooled aftercooler and the coolant outlet of the liquid-cooled aftercooler at a point at which an intermediate temperature of the coolant in the liquid-cooled aftercooler is within twenty percent (±20%) of the exit temperature of the coolant at the subassembly cooler.