Patent ID: 8360758
Filing Date: 2013-01-29
Classification: F04B

Abstract:
1. A peristaltic pump, comprising an outer casing, at least a flexible pump tube adapted for allowing a liquid flowing therethrough, two or more pressuring rollers, and a center driving mechanism, said outer casing having a circular guiding channel formed along an inner side of a peripheral wall of said outer casing to define a circular path therealong, said flexible pump tube having a circular operating portion installed in said circular guiding channel, said circular operating portion of said flexible pump tube circulating and extending around said guiding channel for at least one full circle forming a full circle operating portion along said circular path for said peristaltic pump, said center driving mechanism comprising a driving shaft and a transmission unit, said driving shaft being capable of being driven to rotate at a center portion of said outer casing, said transmission unit being connected to said driving shaft, said pressuring rollers being spacedly, eccentrically, symmetrically, and planetary supported between said operating portion of said flexible pump tube and said center driving mechanism in a radially movable manner, wherein said pressuring rollers are retained and supported to evenly distribute all around and to rolling about an outer circular edge of said center driving mechanism and are driven by said transmission unit of said center driving mechanism to rotate and exert pressure on said operating portion of said flexible pump tube when said driving shaft is driven to rotate in an operating direction, wherein said operating portion of said flexible pump tube is a full circle and said pressuring rollers are evenly distributed all around and rolling about said center driving mechanism in a planetary manner, and thus said full circle operating portion of said flexible pump tube provides a full complete circle of propelling path for said flexible pump tube so as to enable said pressuring rollers to provide continuous pressure on said operating portion of said flexible pump tube respectively by said center driving mechanism for propelling said liquid flowing through said flexible pump tube, thereby said center driving mechanism is adapted to be driven by said driving shaft to switch between an operation state and a pressure release state automatically with respect to a rotating direction of said driving shaft, wherein in said operation state, said center driving mechanism is driven by said driving shaft to rotate in said operating direction to provide a pressure against said operating portion of said flexible pump tube, and that in said release state, said center driving mechanism is able to be driven by said driving shaft in a reverse direction to release said pressure against said operating portion of said flexible pump tube, wherein said driving shaft has a pedal protruded out from an outer surface thereof and said transmission unit comprises two or more driving plates in an overlapped manner, wherein one of said driving plates is a starting plate and each of said driving plates has one or more peripheral indentions, which are evenly formed at a circumferential edge thereof and shaped adapted for said pressuring rollers to be received thereat, and a pedal slot provided at a center portion thereof, wherein said pedal slot of said starting plate is sized and shaped with respect to said pedal of said driving shaft, and said pedal slot of each of said other driving plates has an arc length longer than that of said pedal slot of said starting plate, wherein said pedal slots of said other driving plates extend along said arc lengths thereof at said operating direction of rotation of said driving shaft and are adapted to be driven by said pedal of said driving shaft in a predetermined order of said driving plates, wherein, in said release state, when said driving shaft is not rotating, said peripheral indentions of all of said driving plates are aligned with each other for receiving said pressuring rollers respectively, wherein when said driving shaft keeps rotating in said operating direction, said peripheral indentions of all of said driving plates would never be aligned with each other and thus said pressuring rollers are always be exerting pressure onto said operating portion of said flexible pump tube respectively and continuously.