| 摘要 |
<p>The invention relates to a duplex pump with no friction between the pistons and the cylinders, with a rolling driving mechanism, having enhanced tightness and reliability, which can replace the disc-type piston pumps for conveying liquids of low and medium flow rates without lubricating properties. According to the invention, the pump comprises a driving mechanism consisting of a body (), an actuation and guiding system comprising two cylindrical rolling bars () resting on two guiding bearings (), a rectangular driving recess (), an eccentric rotor () with two plane-parallel rolling tracks (), a piston sealing device consisting of a set of two self-centering rings, a ring () having the role of a piston and a ring () having the role of a cylinder, a device for draining and sealing the pistons inside the casing, having the role of retaining the liquid needed for the hydraulic sealing of the interstice () between the piston and the cylinder, consisting of a draining chamber () which contains a plate-like sealing membrane () made of rubberized cloth, located on the back part of the pistons bodies (), a draining valve consisting of a portion of the sealing membrane () covering the end () of a draining orifice () and a resting device having some resting surfaces () which support the sealing membranes ().</p> |
