Patent ID: 9127659
Filing Date: 2015-09-08
Classification: B29C,B29K,F04B

Abstract:
1. A multistage reciprocating piston air compressor for compressing atmospheric pressure air to an elevated pressure level, the air compressor comprising: a first reciprocating piston stage comprising a first cylinder, a second reciprocating piston stage comprising a second cylinder, and a third reciprocating piston stage comprising a third cylinder, wherein a first solenoid operable in response to a sensed discharge pressure level from a discharge of the first reciprocating piston stage to mechanically hold open the at least one first inlet valve of the first reciprocating piston stage; a second solenoid operable in response to a sensed discharge pressure level from a discharge of the second reciprocating piston stage to mechanically hold open the second inlet valve of the second reciprocating piston stage; a third solenoid operable in response to a sensed discharge pressure level from the third reciprocating piston stage to mechanically hold open the third inlet valve of the third reciprocating piston stage; a first pressurized air discharge at the elevated pressure level from the third reciprocating piston stage; and at least one selected from (i) a first intermediate pressure air discharge line configured to selectably extract first lower pressure compressed air from a first interstage region between the first and second reciprocating piston stages for first lower pressure uses and (ii) a second intermediate pressure air discharge line configured to selectably extract second lower pressure compressed air from a second interstage region between the second and third reciprocating piston stages for second lower pressure uses.