Patent ID: 6540491
Filing Date: 2003-04-01
Classification: F04B

Abstract:
An electromagnetic reciprocating compressor comprising:a casing; and a plurality of fluid compression portions which are arranged in said casing, each of which has a piston, and which are arranged in such a manner that said pistons can move in directions parallel to each other, each of said compression portions having: a cylinder for accommodating said piston so as to be capable of reciprocating; a compression chamber defined by the piston for compressing a fluid; a spring for urging said piston in a direction for compressing said fluid in said compression chamber; one field core having a pair of opposed portions forming magnetic poles oppositely arranged along the diametral direction of said piston; a coil which is wound around said field core and moves said piston against the urging force of said spring when excited; and a discharge chamber for receiving said compressed fluid from said compression chamber when said coil is demagnetized, said compressor further comprising passage means which is provided in said casing and communicates said discharge chambers of said respective compression portions, said field core of said each compression portion being integrally formed so that a boundary portion can be commonly used with a field core of an adjacent compression portion, and at least one of a plurality of said field cores including a power supply device for supplying a half wave of an alternating electric current to said coil in such a manner that an excitation direction is opposed to that of at least a different one of said plurality of said field cores.