Vibration-reducing structure for compressing diaphragm pump

Abstract

A vibration-reducing method for reducing vibrations and vibration noise in a compressing diaphragm pump includes the step of disposing a vibration-reducing unit between the pump head body and a diaphragm membrane to reduce a length of the moment arm, and therefore of the torque, generated upon up and down movement of the diaphragm membrane during pumping.

What is claimed is: 
     
         1 . A vibration-reducing method for a compressing diaphragm pump having a motor, a pump head body fixed to a motor housing, a roundel mount situated on a lower side of the pump head body and a plurality of eccentric roundels that extend through operating holes in the pump head body, a diaphragm membrane fixed to the eccentric roundels through the operating holes and situated on an upper side of the pump head body, and a plurality of pumping pistons arranged to be moved in a pumping action upon movement of the diaphragm membrane, comprising the step of:
 disposing a vibration-reducing unit between the pump head body and diaphragm membrane to lessen the torque of each piston acting zone in the diaphragm membrane by shortening a length of a moment arm generated as a result of circumnutating action of the eccentric roundels in the eccentric roundel mount, so that the vibration strength of the compressing diaphragm pump is effectively reduced, the vibration-reducing unit including a pair of mated vibration-reducing structures, said pair of mated vibration-reducing structures including a pump head body vibration-reducing structure, which is disposed on the upper side of the pump head body, and a mating diaphragm membrane vibration-reducing structure, which is disposed on the bottom side of the diaphragm membrane at a position corresponding to a position of the pump head body vibration-reducing structure on the pump head body, said pump head body vibration-reducing structure and said diaphragm membrane vibration-reducing structure being mated to each other to establish a position of one end of the moment arm at the position of said mating vibration-reducing structures.   
     
     
         2 . A vibration-reducing method for a compressing diaphragm pump with a vibration-reducing structure as claimed in  claim 1 , wherein the motor includes an output shaft, a wobble plate with an integral protruding cam-lobed shaft, and a piston valvular assembly, wherein said eccentric roundel mount includes a bearing for rotatably receiving the integral protruding cam-lobed shaft of the wobble plate, a plurality of eccentric roundels are evenly and circumferentially located on each eccentric roundel, the plurality of eccentric roundels each including a fastening bore formed therein respectively; said pump head body includes a plurality of evenly and circumferentially located through holes, each through hole having an inner diameter slightly bigger than an outer diameter of a respective eccentric roundel on the eccentric roundel mount for receiving the respective eccentric roundel, and said diaphragm membrane includes a plurality of evenly spaced radial raised partition ribs such that when the diaphragm membrane is peripherally attached in a sealing manner to the piston valvular assembly, a plurality of equivalent piston acting zones are formed and partitioned by the radial raised partition ribs such that each piston acting zone has a central through hole therein at a position corresponding to a position of each fastening bore in the eccentric roundel mount respectively; wherein when the motor is powered on, the wobble plate is driven to rotate by the motor output shaft so that the plurality of eccentric roundels on the eccentric roundel mount sequentially move in a constant up-and-down reciprocal stroke while the plurality of pumping pistons and piston acting zones in the diaphragm membrane are driven by the up-and-down reciprocal stroke of the eccentric roundels to move in up-and-down displacement to thereby cause tap water, which flows into the piston valvular assembly, to be compressed to become pressurized water, the pressurized water being constantly discharged out of the compressing diaphragm pump to be further reverse osmosis (RO)-filtered by an RO-cartridge and used in the reverse osmosis water purification system. 
     
     
         3 . The vibration-reducing method as claimed in  claim 2 , wherein each said pump head body vibration-reducing structure is a curved groove in the pump head body and each said diaphragm membrane vibration-reducing structure is a curved protrusion extending from the diaphragm membrane. 
     
     
         4 . The vibration-reducing method as claimed in  claim 2 , wherein each said pump head body vibration-reducing structure is a curved slot in the pump head body and each said diaphragm membrane vibration-reducing structure is a curved protrusion extending from the diaphragm membrane. 
     
     
         5 . The vibration-reducing method as claimed in  claim 2 , wherein each said pump head body vibration-reducing structure is a curved set of openings in the pump head body and each said diaphragm membrane vibration-reducing structure is a curved set of protrusions extending from the diaphragm membrane. 
     
     
         6 . The vibration-reducing method as claimed in  claim 2 , wherein each said pump head body vibration-reducing structure is a curved protrusion extending from the pump head body and each said diaphragm membrane vibration-reducing structure is a curved groove in the diaphragm membrane. 
     
     
         7 . The vibration-reducing method as claimed in  claim 2 , wherein each said pump head body vibration-reducing structure is a curved protrusion extending from the pump head body and each said diaphragm membrane vibration-reducing structure is a curved slot in the diaphragm membrane. 
     
     
         8 . The vibration-reducing method as claimed in  claim 2 , wherein each said pump head body vibration-reducing structure is a curved set of protrusions extending from the pump head body and each said diaphragm membrane vibration-reducing structure is a curved set of openings in the diaphragm membrane. 
     
     
         9 . The vibration-reducing method as claimed in  claim 8 , wherein said protrusions are round protrusions. 
     
     
         10 . The vibration-reducing method as claimed in  claim 8 , wherein said protrusions are square protrusions. 
     
     
         11 . The vibration-reducing method as claimed in  claim 1 , wherein each said pump head body vibration-reducing structure is a pair of curved grooves or slots in the pump head body and each said diaphragm membrane vibration-reducing structure is a pair of curved protrusions extending from the diaphragm membrane. 
     
     
         12 . The vibration-reducing method as claimed in  claim 1 , wherein each said pump head body vibration-reducing structure is a curved protrusions extending from the pump head body and each said diaphragm membrane vibration-reducing structure is a pair of curved grooves or slots in the diaphragm membrane. 
     
     
         13 . The vibration-reducing method as claimed in  claim 12 , wherein said protrusions are round protrusions. 
     
     
         14 . The vibration-reducing method as claimed in  claim 12 , wherein said protrusions are round protrusions. 
     
     
         15 . The vibration-reducing method as claimed in  claim 2 , wherein each said pump head body vibration-reducing structure is an indented ring in the pump head body and each said diaphragm membrane vibration-reducing structure is a ring structure projecting from the diaphragm membrane. 
     
     
         16 . The vibration-reducing method as claimed in  claim 2 , wherein each said pump head body vibration-reducing structure is a pair of indented rings in the pump head body and each said diaphragm membrane vibration-reducing structure is a pair of ring structures projecting from the diaphragm membrane. 
     
     
         17 . The vibration-reducing method as claimed in  claim 2 , wherein each said eccentric roundel further includes an annular groove extending around said fastening bore, and said pump head body further includes a plurality of lower annular flanges extending into respective said annular grooves when said pump head body is fastened to said eccentric roundel. 
     
     
         18 . The vibration-reducing method as claimed in  claim 2 , wherein said at least one raised rim of said diaphragm membrane is an inner raised rim, said diaphragm membrane includes a parallel outer raised rim, said piston valvular assembly includes a downwardly extending raised rim, and said to downwardly extending raised rim of said piston valvular assembly extends between said inner and outer raised rims of said diaphragm membrane to provide a peripheral seal when said diaphragm membrane is peripherally secured to said piston valvular assembly. 
     
     
         19 . The vibration-reducing method as claimed in  claim 2 , wherein a respective number of said eccentric roundels, said operating holes in said pump head body, said piston acting zones, and said pumping pistons is three. 
     
     
         20 . The vibration-reducing method as claimed in  claim 2 , wherein a number of said circumferential inlet mounts is three. 
     
     
         21 . The vibration-reducing method as claimed in  claim 2 , wherein said fastening bores in said eccentric roundels are threaded bores and said fastening members are screws. 
     
     
         22 . The vibration-reducing method as claimed in  claim 2 , wherein said cavity is formed by a bottom of an annular rib ring of the pump head cover being pressed onto a rim of the central outlet mount of the piston valvular assembly. 
     
     
         23 . The vibration-reducing method as claimed in  claim 1 , wherein said motor is a brushed motor. 
     
     
         24 . The vibration-reducing method as claimed in  claim 1 , wherein said motor is a brushless motor.