Double pressure compressed air electric apparatus having an air drying device

Claim 2

A closed cycle double pressure compressed-air electric apparatus disposed in atmospheric air, comprising a high-pressure compressed-air enclosure, a low-pressure compressed-air enclosure carrying compressed air having a pressure greater than the atmospheric pressure, conduit means connecting said high-pressure compressed-air enclosure to the atmosphere, air-drying means inserted in said conduit means, compressor means in said conduit means, and pressure responsive three-way valve means inserted in said conduit means between said compressor means and the atmosphere and also connected to said low-pressure compressed air enclosure, said three-way valve means being responsive to the pressure of said low-pressure compressed air enclosure and adapted to connect said compressor means selectively to said lowpressure compressed air enclosure and to the atmosphere in a manner such that said compressor means is normally connected to said low-pressure compressed air enclosure whereby an abnormal pressure drop in said low-pressure enclosure causes said valve means to connect said compressor means to the atmosphere.

Claim 3

A closed cycle double pressure compressed air electric apparatus disposed in atmospheric air, comprising a high-pressure compressed air enclosure, a low-pressure compressed air enclosure, a compressor having a high pressure outlet connected to said high-pressure enclosure and an inlet, valve means connected to said inlet and adapted to connect said inlet selectively to said low-pressure enclosure and to the atmosphere, said valve means comprising pressure sensitive control means responsive to the pressure in said low-pressure enclosure to control the position of said valve means in a manner such that said valve means connect said inlet to said low-pressure enclosure under normal pressurized condition of said low-pressure enclosure and to the atmosphere upon an abnormal drop of pressure therein below a predetermined pressure greater than the atmospheric pressure, and air-drying means to dry the air taken by said compressor from the atmosphere.

Claim 4

A closed cycle double pressure compressed air electric apparatus disposed in atmospheric air, comprising a high-pressure compressed air enclosure, a low-pressure compressed air enclosure, a compressor having a high pressure outlet connected to said high-pressure enclosure and an inlet, valve means connected to said inlet and adapted to connect said inlet selectively to said low-pressure enclosure and to the atmosphere, said valve means comprising pressure sensitive control means responsive to the pressure in said low-pressure enclosure to control the position of said valve means in a manner such that said valve means connect said inlet to said low-pressure enclosure under normal pressurized condition of said low-pressure enclosure and to the atmosphere upon an abnormal drop of pressure therein below a predetermined pressure greater than the atmospheric pressure, and air-drying means to dry the air taken by said compressor from the atmosphere.

Claim 5

A substantially closed-cycle air blast circuit interrupted comprising arc-extinguishing means, a high-pressure tank supplying high-pressurized compressed air to said arc-extinguishing means, a low-pressure tank collecting exhaust air from said arc-extinguishing means, a compressor adapted to supply high-pressurized air to said high-pressure tank and to maintain the pressure therein at a predetermined value, said compressor having an inlet, valve means connected to said inlet and also to said low-pressure tank and to the atmosphere to cause said inlet to communicate selectively with said low pressure tank and with the atmosphere, said valve means comprising pressure-sensitive control means for controlling the position of said valve means responsive to the value of the pressure in said low-pressure tank so that said inlet is connected to said low-pressure tank under normal pressurized condition thereof and to atmosphere upon a drop of said value of the pressure in said low pressure tank below a predetermined pressure value greater than the atmospheric pressure to cause said compressor to take air from the atmosphere until said normal pressurized condition is restored, and air-drying means to dry the air taken by said compressor from the atmosphere.

Claim 6

A substantially closed-cycle air blast circuit interrupted comprising arc-extinguishing means, a high-pressure tank supplying high-pressurized compressed air to said arc-extinguishing means, a low-pressure tank collecting exhaust air from said arc-extinguishing means, a compressor adapted to supply high-pressurized air to said high-pressure tank and to maintain the pressure therein at a predetermined value, said compressor having an inlet, valve means connected to said inlet and also to said low-pressure tank and to the atmosphere to cause said inlet to communicate selectively with said low pressure tank and with the atmosphere, said valve means comprising pressure-sensitive control means for controlling the position of said valve means responsive to the value of the pressure in said low-pressure tank so that said inlet is connected to said low-pressure tank under normal pressurized condition thereof and to atmosphere upon a drop of said value of the pressure in said low pressure tank below a predetermined pressure value greater than the atmospheric pressure to cause said compressor to take air from the atmosphere until said normal pressurized condition is restored, and air-drying means to dry the air taken by said compressor from the atmosphere.