Pump particularly useful in respirator apparatus

Details Pump particularly useful in respirator apparatus Pump particularly useful in respirator apparatus

F - Mech Eng,Light,Heat,Weapons

04

B

F04B 35/01 (2006.01) A61M 16/00 (2006.01) A61M 16/20 (2006.01) F04B 9/02 (2006.01)

Patent

CA 2143161

A reciprocating pump particularly useful in ventilator apparatus includes a piston reciprocatable axially within a cylinder and dividing its interior into an inlet chamber and an outlet chamber, a wall fixed within the inlet chamber, and a drive housing fixed to the wall. The drive housing includes a motor, a rotor rotatable by the motor, a nut rotatable within the drive housing, and a screw threadedly coupled atone end to the nut and fixed at its opposite end to the piston. The piston is substantially unrestrained for axial and rotary movement such that forward and reverse rotation of the nut by the motor reciprocates the screw and the piston axially of the cylinder, and also permits the screw and the piston to rotate with respect to the cylinder to thereby even out wear between the piston and cylinder.

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