Patent ID: 8007256

Claim:
An electromagnetic reciprocating fluid device comprising: a stationary housing having a first end and a second end: a movable member disposed in said stationary housing and having a first end and a second end, said movable member comprising a permanent magnet and being reciprocable along a predetermined axis extending through said first end and said second end of said stationary housing; a support device configured to support said movable member reciprocally along the predetermined axis, said support device comprising a first support unit disposed on said first end of said stationary housing to support said first end of said movable member and a second support unit disposed on said second end of said stationary housing to support said second end of said movable member; and an electromagnetic drive unit securely disposed in said stationary housing and being configured to drive said movable member along the predetermined axis by generating an alternating magnetic field acting on said permanent magnet of said movable member; wherein said first support unit comprises a first cylinder, said first cylinder being a sole cylinder securely connected to said first end of said housing, and a first piston, said first piston being a sole piston securely connected to said first end of said movable member and reciprocally received in said first cylinder, and being slidable relative to said first cylinder along a longitudinal axis of said first cylinder that is parallel to or coaxial with the predetermined axis; and said second support unit comprises a second cylinder, said second cylinder being a sole cylinder securely connected to said second end of said housing, and a second piston, said second piston being a sole piston securely connected to said second end of said movable member and reciprocally received in said second cylinder, said second piston being slidable relative to said second cylinder along a longitudinal axis of said second cylinder that is spaced apart from and parallel to the longitudinal axis of said first cylinder.