Device for cooling and silencing of noise of a compressor or vacuum pump

Apparatus for cooling and silencing a pressure fluid device, such as a compressor or a pump, having inlet and outlet ports and which is driven by an electric motor, comprising

• (a) a sealed container (3) containing a chamber in which said pressure fluid device and said motor are arranged, the bottom, side and top walls of said container each including a layer (7) of sound-absorbing material;
• (b) a quantity of cooling and sound-absorbing liquid (4) filling the space in said chamber to a level above that of said device and said motor, whereby the device and motor and completely immersed in the liquid;
• (c) inlet and outlet pipes (15, 16) extending through a wall of said container and connected at one end with the inlet and outlet ports of said device for supplying fluid to, and for removing fluid from, said device, respectively;
• (d) heat exchanger means (9) arranged externally of said container;
• and
• (e) input and outlet conduit means (10, 11) connecting said heat exchanger means with said chamber to permit the flow of liquid between said chamber and said heat exchanger means, thereby to modify the temperature of said liquid.