Roundel structure for four-compression-chamber diaphragm pump with multiple effects

Abstract

A cylindrical or inverted frustoconical eccentric roundel structure for a four-compression-chamber diaphragm pump includes an annular positioning groove, a vertical or inverted frustoconical flank, and a sloped top ring extending between the annular positioning groove and the vertical or inverted frustoconical flank. By providing the sloped top ring, the oblique high frequency pulling and squeezing phenomenon that occurs in a conventional tubular eccentric roundel is completely eliminated.

What is claimed is: 
     
         1 . A roundel structure for a four-compression-chamber diaphragm pump, said roundel structure including a roundel mount situated on a lower side of a pump head body and four eccentric roundels mounted on the roundel mount to extend through four operating holes in the pump head body, said four-compression-chamber diaphragm pump having a motor with a motor housing to which the pump head body is fixed, a diaphragm membrane fixed to the four eccentric roundels through the four operating holes and situated on an upper side of the pump head body, and four pumping pistons arranged to be moved in a pumping action upon movement of the diaphragm membrane, the roundel mount engaging a wobble plate such that rotation of the wobble plate by the motor causes the roundel mount to wobble, resulting in sequential up and down movement of the four eccentric roundels, the sequential up and down movement of the eccentric roundels causing sequential, reciprocating movement of four piston acting zones in the diaphragm member and the four pumping pistons, and the diaphragm membrane further including four annular downwardly-projecting positioning protrusions each arranged to be inserted into a respective annular positioning groove in a top surface of each of said eccentric roundels, wherein:
 a section of the top surface of each eccentric roundel is inclined relative to horizontal to form a sloped top ring between a respective said annular positioning groove and a vertical or inverted frustoconical flank of the respective eccentric roundel.   
     
     
         2 . A roundel structure for a four-compression-chamber diaphragm pump as claimed in  claim 1 , wherein said eccentric roundel mount includes a central bearing for receiving an integral cam-lobed shaft of the wobble plate to enable said sequential up and down movement of the four eccentric roundels in response to rotation of the wobble plate by the motor. 
     
     
         3 . A roundel structure for a four-compression-chamber diaphragm pump as claimed in  claim 1 , wherein:
 said pump head body is secured to the motor housing to encompass the wobble plate and eccentric roundel mount therein;   said diaphragm membrane is made of a semi-rigid elastic material and placed on the pump head body, said diaphragm membrane including at least one raised rim as well as a plurality of evenly spaced radial raised partition ribs connected with the at least one raised brim to form said four piston acting zones, and   each piston acting zone has an acting zone hole formed therein at a position corresponding to a position of a fastening bore in a respective one of the eccentric roundels, and each pumping piston has a tiered hole such that a fastening member extends through the tiered hole, through the acting zone hole of each corresponding piston acting zone in the diaphragm membrane, and into a respective fastening hole in a respective one of the eccentric roundels to secure the diaphragm membrane and each of the pumping pistons to the corresponding eccentric roundels in the eccentric roundel mount.   
     
     
         4 . A roundel structure for a four-compression-chamber diaphragm pump as claimed in  claim 3 , wherein said four-compression-chamber diaphragm pump further includes:
 a piston valvular assembly that covers the diaphragm membrane and is peripherally secured to the diaphragm membrane by sealing engagement, the piston valvular assembly including a central outlet mount having a central positioning bore and a plurality of equivalent sectors, each of which contains multiple evenly circumferentially-located outlet ports, a T-shaped plastic anti-backflow valve with a central positioning shank, and a plurality of circumferential inlet mounts, each of each of the inlet mounts including multiple evenly circumferentially-located inlet ports and an inverted central piston disk mounted to the respective inlet mount so that each piston disk serves as a valve for each corresponding group of multiple inlet ports, wherein the central positioning shank of the plastic anti-backflow valve mates with the central positioning bore of the central outlet mount such that said multiple outlet ports in the central round outlet mount communicate with the plurality of inlet mounts, and a hermetic preliminary water-pressurizing chamber is formed in each inlet mount and corresponding piston acting zone in the diaphragm membrane upon the diaphragm membrane being peripherally secured to the piston valvular assembly such that one end of each of the preliminary water-pressuring chamber is communicable with each corresponding one of said inlet ports; and   a pump head cover, which covers the pump head body to encompass the piston valvular assembly, pumping pistons and diaphragm membrane therein, includes a water inlet orifice, and a water outlet orifice, said pump head cover being hermetically attached to the assembly of diaphragm membrane and piston valvular assembly to form a high-pressured water chamber between a cavity formed by an inside wall of an annular rib ring and the central outlet mount of the piston valvular assembly.   
     
     
         5 . A roundel structure for a four-compression-chamber diaphragm pump as claimed in  claim 1 , wherein each said eccentric roundel is a cylindrical eccentric roundel. 
     
     
         6 . A roundel structure for a four-compression-chamber diaphragm pump as claimed in  claim 1 , wherein each said eccentric roundel is an inverted frustoconical eccentric roundel, and wherein a largest diameter of the inverted frustoconical eccentric roundel is smaller than an inner diameter of a corresponding one of said operating holes in the pump head body. 
     
     
         7 . A roundel structure for a four-compression-chamber diaphragm pump as claimed in  claim 6 , wherein said inverted frustoconical eccentric roundels each includes a mounting portion fixed to the roundel mount and a separable inverted frustoconical roundel yoke mounted on the roundel mount to form a two-layered eccentric roundel structure. 
     
     
         8 . A roundel structure for a four-compression-chamber diaphragm pump as claimed in  claim 7 , wherein the mounting portion of each of the inverted frustoconical eccentric roundels is integrally fabricated with the roundel mount, and the inverted frustoconical roundel yokes are separately fabricated. 
     
     
         9 . A roundel structure for a four-compression-chamber diaphragm pump as claimed in  claim 6 , wherein a mounting portion of each of the inverted frustoconical eccentric roundels includes a base with an inwardly-facing positioning surface and a cylinder with a central female-threaded bore extending upwardly from the base, and wherein each of the inverted frustoconical yokes includes an upper bore, a middle bore, and a lower bore, wherein a diameter of the middle bore is approximately equal to a diameter of the mounting portion cylinder, a diameter of the upper bore is larger than the diameter of the mounting portion cylinder, and a diameter of the lower bore is approximately equal to a diameter of the mounting portion base, said lower bore being fitted over the base, said middle bore being sleeved over the cylinder, and said annular positioning groove being defined by a space between said cylinder and an inner wall of said upper bore. 
     
     
         10 . A roundel structure for a four-compression-chamber diaphragm pump as claimed in  claim 1 , wherein said motor is a brushed motor. 
     
     
         11 . A roundel structure for a four-compression-chamber diaphragm pump as claimed in  claim 1 , wherein said motor is a brushless motor.