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.

Description:
[0001]    This application claims the benefit of provisional U.S. Patent Application No. 61/928,162, filed Jan. 16, 2014, and incorporated herein by reference. 
     
    
     FIELD OF THE PRESENT INVENTION 
       [0002]    The present invention relates to a vibration-reducing method for compressing diaphragm pump used in a reverse osmosis purification system, and particularly to a method that utilizes a vibration-reducing unit to reduce the vibration strength of the pump so that the annoying noise incurred by consonance with the housing of the reverse osmosis purification system is eliminated when the vibration-reducing unit is installed thereon. 
       BACKGROUND OF THE INVENTION 
       [0003]    Conventional compressing diaphragm pumps, which have been exclusively used with RO (Reverse Osmosis) purifier or RO water purification systems, are disclosed in U.S. Pat. Nos. 4,396,357, 4,610,605, 5,476,367, 5,571,000, 5,615,597, 5,626,464, 5,649,812, 5,706,715, 5,791,882, 5,816,133, 6,048,183, 6,089,838, 6,299,414, 6,604,909, 6,840,745 and 6,892,624. 
         [0004]    The conventional compressing diaphragm pump, as shown in  FIGS. 1 through 9 , essentially comprises a brushed or brushless motor  10  with an output shaft  11 , a motor upper chassis  30 , a wobble plate  40  with integral protruding cam-lobed shaft, an eccentric roundel mount  50 , a pump head body  60 , a diaphragm membrane  70 , three pumping pistons  80 , a piston valvular assembly  90  and a pump head cover  20 . The motor upper chassis  30  includes components of a bearing  31  through which an output shaft  11  of the motor  10  extends, an upper annular rib ring  32  with three positioning seats  33  disposed therein in an even and circumferentially-located manner. Each positioning seat  33  has a respective screw-threaded bore  34  created therein. The wobble plate  40  with integral protruding cam-lobed shaft includes a shaft coupling hole  41  through which the corresponding motor output shaft  11  of the motor  10  extends, and the eccentric roundel mount  50  includes bearing  51  for the corresponding wobble plate  40 , and three eccentric roundels  52  disposed thereon in an even and circumferentially-located manner such that each eccentric roundel  52  has a screw-threaded bore  53  and an annular positioning dent  54  formed therein respectively. The pump head body  60  covers the upper annular rib ring  32  of the motor upper chassis  30  and encompasses the wobble plate  40  and eccentric roundel mount  50  therein. Pump head body  60  includes three through holes  61  evenly disposed therein in a circumferentially-located manner, and arranged such that each through hole  61  has an inner diameter slightly bigger than an outer diameter of the eccentric roundel  52  in the eccentric roundel mount  50  for respectively receiving each corresponding eccentric roundel  52 . The pump head body  60  further includes a lower annular flange  62  formed thereunder for mating with corresponding motor upper chassis  30  in a peripherally flush manner, three inner peripheral fastening through bores  63  and three outer peripheral fastening through bores  64  evenly disposed in a circumferentially-located manner such that each inner peripheral fastening through bore  63  mates with the positioning seat  33  in the motor upper chassis  30 . The diaphragm membrane  70 , which is plastic extrusion molded and placed on the pump head body  60 , includes a sealing raised rim  71  and three evenly spaced radial raised partition ribs  72 , such that each sealing raised rim  71  ends and connects with the sealing raised rim  71 . Three equivalent piston acting zones  73  are formed and partitioned by the radial raised partition ribs  72  such that each piston acting zone  73  has a central through hole  74  created therein in correspondence with respective screw-threaded bores  53  in the eccentric roundel mount  50 , and an annular positioning protrusion  75  for each central through hole  74  is formed at the bottom side thereof (as shown in  FIGS. 7 and 8 ). The pumping pistons  80  are respectively disposed in each corresponding piston acting zones  73  of the diaphragm membrane  70 , and each pumping piston  80  includes a tiered hole  81  running therethrough By running fastening screw  1  through the tiered hole  81  of each pumping piston  80  and the central through hole  74  of each corresponding piston acting zone  73  in the diaphragm membrane  70 , the diaphragm membrane  70  and three pumping pistons  80  can be securely screwed into each screw-threaded bore  53  of the corresponding three annular positioning indents  54  in the eccentric roundel mount  50  (as shown in  FIG. 9 . The piston valvular assembly  90  includes a central outlet mount  91  having a central positioning bore  92  with three equivalent sectors, each of which contains multiple evenly circumferentially-located outlet ports  94 , a plastic anti-backflow valve  93  with a central positioning shank, and three circumjacent inlet mounts with multiple evenly circumferentially-located inlet ports  95  and a respective inverted central piston disk  96 . The central positioning shank of the plastic anti-backflow valve  93  mates with the central positioning bore  92  of the central outlet mount  91 , and each piston disk  96  serves as a valve for each corresponding group of multiple evenly circumferentially-located inlet ports  95 . The pump head cover  20  includes a water inlet orifice  21 , a water outlet orifice  22 , three outer peripheral fastening through bores  23  and three inner peripheral fastening through bores  23  disposed on the outside thereof as well as a tiered rim  24  and an annular rib ring  25  disposed in the bottom inside thereof such that the outer rim for the assembly of diaphragm membrane  70  and piston valvular assembly  90  can be attached to tiered rim  24  in a water tight manner. A water inlet chamber  26  is configured between each pumping piston  80  of the diaphragm membrane  70  and a corresponding group of outlet ports  94  in each corresponding sector of the central outlet mount  91 , such that passage of water at one end of the water inlet chamber  26  is controlled by the plastic anti-backflow valve  93  while the other end communicates with corresponding inlet port  95  (as shown in  FIG. 9 ), and a high-pressure water chamber  27  is configured between the cavity formed by the inside wall of the annular rib ring  25  and the central outlet mount  91  of the piston valvular assembly  90  by pressing the bottom of the annular rib ring  25  onto the rim for the central outlet mount  91  of the piston valvular assembly  90  (as shown in  FIG. 9 ). 
         [0005]      FIGS. 1 and 9  illustrate the manner in which the conventional compressing diaphragm pump is assembled. Firstly, the three annular positioning protrusions  75  are inserted at the bottom side of the diaphragm membrane  70  into the corresponding three annular positioning indents  54  in the eccentric roundels  52  of the eccentric roundel mount  50 . Secondly, fastening screw  1  is inserted through the tiered hole  81  of each pumping piston  80  and the central through hole  74  of each corresponding piston acting zone  73  in the diaphragm membrane  70 . Thirdly, each fastening screw  1  is driven until tight to securely screw the diaphragm membrane  70  and three pumping pistons  80  into each screw-threaded bore  53  of corresponding the three annular positioning indents  54  in the eccentric roundel mount  50  (as shown in  FIG. 9 ); Fourthly, three fastening bolts  2  are inserted through the three outer peripheral fastening through bores  23  of pump head cover  20  and each corresponding outer peripheral fastening through bore  64  in the pump head body  60 . 
         [0006]    Fifthly, a nut  3  (shown in  FIG. 9 ) is placed onto each fastening bolt  2  to securely screw the pump head cover  20  and the pump head body  60  (as shown in  FIG. 1 ); Sixthly, three self-threading screws or self-drilling screws  4  are inserted through the other three inner peripheral fastening through bores  23  of pump head cover  20  and each corresponding inner peripheral fastening through bore  63  in the pump head body  60 . Finally, each self-threading screw or self-drilling screw  4  is driven until tight to securely screw the pump head cover  20  and the pump head body  60  so that the whole assembly of the conventional compressing diaphragm pump is finished (as shown in  FIGS. 1 and 9 ). 
         [0007]      FIGS. 10 and 11  are illustrative figures for the practical operation mode of the conventional compressing diaphragm pump. 
         [0008]    Firstly, when the motor  10  is powered on, the wobble plate  40  is driven to rotate by the motor output shaft  11  so that the three eccentric roundels  52  on the eccentric roundel mount  50  move sequentially up-and-down in a constant reciprocal stroke. Secondly, in the meantime, the three pumping pistons  80  and three piston acting zones  73  in the diaphragm membrane  70  are driven by the up-and-down reciprocal stroke of the three eccentric roundels  52  to move in a sequential up-and-down displacement. Thirdly, when the eccentric roundel  52  moves in a down stroke with pumping piston  80  and piston acting zone  73  being downwardly displaced, the piston disk  96  in the piston valvular assembly  90  is pushed into an open status so that the tap water W can flow into the water inlet chamber  26  via water inlet orifice  21  in the pump head cover  20  and sequentially via inlet ports  95  in the piston valvular assembly  90  (as indicated by the arrow in the enlarged portion of  FIG. 10 ). Fourthly, when the eccentric roundel  52  moves in up stroke with pumping piston  80  and piston acting zone  73  being displaced upwardly, the piston disk  96  in the piston valvular assembly  90  is pulled into a closed status to compress the tap water W in the water inlet chamber  26  and increase the water pressure therein up to range of 80 psi-100 psi to obtain pressurized water Wp, with the result that the plastic anti-backflow valve  93  in the piston valvular assembly  90  is pushed to open status. Fifthly, when the plastic anti-backflow valve  93  in the piston valvular assembly  90  is pushed to open status, the pressurized water Wp in the water inlet chamber  26  is directed into high-pressure water chamber  27  via a group of outlet ports  94  for the corresponding sector in central outlet mount  91 , and then expelled out of the water outlet orifice  22  in the pump head cover  20  (as indicated by the arrows in the enlarged portion of  FIG. 11 ). Finally, as a result of iterative sequential action for each group of outlet ports  94  of the three sectors in central outlet mount  91 , the pressurized water Wp is constantly discharged out of the conventional compressing diaphragm pump to be further RO-filtered by the RO-cartridge so that the final filtered pressurized water Wp can be used in the reverse osmosis water purification system. 
         [0009]    Referring to  FIGS. 12 through 14 , a primary serious drawback has long existed in the foregoing conventional compressing diaphragm pump. As described previously, when the motor  10  is powered on, the wobble plate  40  is driven to rotate by the motor output shaft  11  so that the three eccentric roundels  52  on the eccentric roundel mount  50  sequentially move in a constant up-and-down reciprocal stroke, while the three pumping pistons  80  and three piston acting zones  73  in the diaphragm membrane  70  are driven by the sequential up-and-down reciprocal stroke of the three eccentric roundels  52  to move in up-and-down displacement so that a corresponding acting force F constantly acts on the three piston acting zones  73  with a length of moment arm L 1  measured from the sealing raised rim  71  to the periphery of the annular positioning protrusion  75  (as shown in FIG.  13 ). Thereby, a resultant torque is created by the acting force F multiplying the length of moment arm L 1  according to the formula “torque=acting force F×length of moment arm L 1 .”. However, the resultant torque causes the whole conventional compressing diaphragm pump to vibrate directly. With a high rotational speed of the motor output shaft  11  in the motor  10  of up to 700-1200 rpm, the vibrating strength caused by alternately acting of three eccentric roundels  52  can reach a persistently unacceptable level. Furthermore, in addition to the primary direct vibration drawback, the water pipe P connected on the water outlet orifice  22  of the pump head cover  20  will also synchronously shake in resonance with the vibration of the pump (as indicated by arrow “a” in  FIG. 14(   a )). This synchronous shaking” of the water pipe P will further cause other parts of the conventional compressing diaphragm pump to also simultaneously shake. Consequently, the overall resonant shaking aforesaid will cause vibration of the housing C of the reverse osmosis purification unit to become stronger, increasing vibration noise and, after a certain period, causing water leakage of the conventional compressing diaphragm pump due to a gradually loosened connection between water pipe P and water outlet orifice  22 , as well as gradual loosening of other parts affected by the shaking. 
         [0010]    To address the above-described drawbacks of the conventional compressing diaphragm pump, a cushion base  100  with a pair of wing plates  101  is added to provide supplementary support for the pump (as shown in  FIG. 14 ) such that each wing plate  101  is further sleeved by a rubber shock absorber  102  for vibration suppressing enhancement. Upon installation of the conventional compressing diaphragm pump, the cushion base  100  is firmly screwed onto the housing C of the reverse osmosis purification unit by means of suitable fastening screws  103  and corresponding nuts  104 . 
         [0011]    However, the practical vibration suppressing efficiency of using foregoing cushion base  100  with wing plates  101  and rubber shock absorber  102  only affects the primary vibrating drawback to a limited degree, and does not solve the drawbacks of overall resonant shaking or water leakage for the conventional compressing diaphragm pump. The problem of substantially reducing all of the drawbacks associated with the operating vibration of the compressing diaphragm pump has become an urgent and critical issue. 
       SUMMARY OF THE INVENTION 
       [0012]    An objective is to provide a vibration-reducing method for a compressing diaphragm pump that features of a vibration-reducing unit. The compressing diaphragm pump includes a brushed or brushless motor with an output shaft, a pump head cover, a motor upper chassis, a wobble plate with integral protruding cam-lobed shaft, an eccentric roundel mount with three eccentric roundels, a pump head body, a diaphragm membrane with three piston acting zones, three pumping pistons and a piston valvular assembly. The vibration-reducing unit is disposed between the pump head body and diaphragm membrane. The vibration-reducing unit functions for diminishing torque by shortening the length of the moment arm for the circumnutating action of the eccentric roundel mount in each piston acting zone. Since the torque is the equal to the length of moment arm multiplied by a constant acting force, a lower torque is generated by the shortened length of moment arm. Consequently, with less torque for the compressing diaphragm pump, the strength of vibration is substantially reduced, with a consequent lowering of annoying vibration noise. 
         [0013]    Another objective is to provide a vibration-reducing method for a compressing diaphragm pump that features a vibration-reducing unit disposed between a pump head body with three basic curved indents and a diaphragm membrane with three basic curved protrusions, in which the three basic curved protrusions are completely inserted into the corresponding three basic curved indents. The vibration-reducing unit functions to diminish torque by shortening the length of the moment arm for each piston acting zone upon circumnutating action of the eccentric roundel mount. Because the torque is obtained by multiplying the length of the moment arm by a constant acting force, is reduced due to the shortened length of moment arm, the strength of vibration and the resulting vibration noise is also substantially reduced. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0014]      FIG. 1  is a perspective assembled view of a conventional compressing diaphragm pump. 
           [0015]      FIG. 2  is a perspective exploded view of a conventional compressing diaphragm pump. 
           [0016]      FIG. 3  is a perspective view of a pump head body for the conventional compressing diaphragm pump. 
           [0017]      FIG. 4  is a cross sectional view taken against the section line  3 - 3  from previous  FIG. 3 . 
           [0018]      FIG. 5  is a top view of a pump head body of the conventional compressing diaphragm pump. 
           [0019]      FIG. 6  is a perspective view of a diaphragm membrane of the conventional compressing diaphragm pump. 
           [0020]      FIG. 7  is a cross sectional view taken against the section line  7 - 7  from previous  FIG. 6 . 
           [0021]      FIG. 8  is a bottom view of a diaphragm membrane of conventional compressing diaphragm pump. 
           [0022]      FIG. 9  is a cross sectional view taken against the section line  9 - 9  from previous  FIG. 1 . 
           [0023]      FIG. 10  is the first operation illustrative view of a conventional compressing diaphragm pump. 
           [0024]      FIG. 11  is the second operation illustrative view of a conventional compressing diaphragm pump. 
           [0025]      FIG. 12  is the third operation illustrative view of the conventional compressing diaphragm pump with a partially enlarged view of a circled-portion. 
           [0026]      FIG. 13  is a partially enlarged view taken from the circled-portion “a” in the enlarged view of previous  FIG. 12 . 
           [0027]      FIG. 14  is a schematic side view showing a conventional compressing diaphragm pump installed on a mounting base in a reverse osmosis purification system. 
           [0028]      FIG. 14(   a ) is a schematic end view of the conventional compressing diaphragm pump installed on a mounting base, as illustrated in  FIG. 14 . 
           [0029]      FIG. 15  is a perspective exploded view of the first exemplary embodiment of the present invention. 
           [0030]      FIG. 16  is a perspective view of a pump head body in the first exemplary embodiment of the present invention. 
           [0031]      FIG. 17  is a cross sectional view taken against the section line  17 - 17  from previous  FIG. 16 . 
           [0032]      FIG. 18  is a top view of a pump head body in the first exemplary embodiment of the present invention. 
           [0033]      FIG. 19  is a perspective view of a diaphragm membrane in the first exemplary embodiment of the present invention. 
           [0034]      FIG. 20  is a cross sectional view taken against the section line  20 - 20  from previous  FIG. 19 . 
           [0035]      FIG. 21  is a bottom view of a diaphragm membrane in the first exemplary embodiment of the present invention. 
           [0036]      FIG. 22  is an assembled cross sectional view for the first exemplary embodiment of the present invention. 
           [0037]      FIG. 23  is an operation illustrative view for the first exemplary embodiment of the present invention with a partially enlarged view of the circled-portion. 
           [0038]      FIG. 24  is a partially enlarged view taken from the circled-portion “a” of previous  FIG. 23 . 
           [0039]      FIG. 25  is a perspective view of a pump head body in the second exemplary embodiment of the present invention. 
           [0040]      FIG. 26  is a cross sectional view taken against the section line  26 - 26  from previous  FIG. 25 . 
           [0041]      FIG. 27  is a top view of a pump head body in the second exemplary embodiment of the present invention. 
           [0042]      FIG. 28  is a perspective view of a diaphragm membrane in the second exemplary embodiment of the present invention. 
           [0043]      FIG. 29  is a cross sectional view taken against the section line  29 - 29  from previous  FIG. 28 . 
           [0044]      FIG. 30  is a perspective view of a diaphragm membrane in the second exemplary embodiment of the present invention. 
           [0045]      FIG. 31  is a cross section assembled view of a diaphragm membrane and a pump head body in the second exemplary embodiment of the present invention. 
           [0046]      FIG. 32  is a perspective view of a pump head body in the third exemplary embodiment of the present invention. 
           [0047]      FIG. 33  is a cross sectional view taken against the section line  33 - 33  from previous  FIG. 32 . 
           [0048]      FIG. 34  is a top view of a pump head body in the third exemplary embodiment of the present invention. 
           [0049]      FIG. 35  is a perspective view of a diaphragm membrane in the third exemplary embodiment of the present invention. 
           [0050]      FIG. 36  is a cross sectional view taken against the section line  36 - 36  from previous  FIG. 35 . 
           [0051]      FIG. 37  is a bottom view of a pump head body in the third exemplary embodiment of the present invention. 
           [0052]      FIG. 38  is a cross section assembled view for a diaphragm membrane and a pump head body in the third exemplary embodiment of the present invention. 
           [0053]      FIG. 39  is a perspective view for pump head body in the fourth exemplary embodiment of the present invention. 
           [0054]      FIG. 40  is a cross sectional view taken against the section line  40 - 40  from previous  FIG. 39 . 
           [0055]      FIG. 41  is a top view of a pump head body in the fourth exemplary embodiment of the present invention. 
           [0056]      FIG. 42  is a perspective view of a diaphragm membrane in the fourth exemplary embodiment of the present invention. 
           [0057]      FIG. 43  is a cross sectional view taken against the section line  43 - 43  from previous  FIG. 42 . 
           [0058]      FIG. 44  is a bottom view of a diaphragm membrane in the fourth exemplary embodiment of the present invention. 
           [0059]      FIG. 45  is a perspective view of a pump head body in a variation of the fourth exemplary embodiment of the present invention. 
           [0060]      FIG. 46  is a cross sectional view taken against the section line  45 - 45  from previous  FIG. 45 . 
           [0061]      FIG. 47  is a top view of a pump head body in the variation of the fourth exemplary embodiment of the present invention. 
           [0062]      FIG. 48  is a perspective view of a diaphragm membrane in the variation of the fourth exemplary embodiment of the present invention. 
           [0063]      FIG. 49  is a cross sectional view taken against the section line  49 - 49  from previous  FIG. 48 . 
           [0064]      FIG. 50  is a bottom view of a diaphragm membrane in the variation of the fourth exemplary embodiment of the present invention. 
           [0065]      FIG. 51  is a perspective view of a pump head body in the variation of the fourth exemplary embodiment of the present invention. 
           [0066]      FIG. 52  is a cross sectional view taken against the section line  52 - 52  from previous  FIG. 51 . 
           [0067]      FIG. 53  is a top view of a pump head body in the variation of the fourth exemplary embodiment of the present invention. 
           [0068]      FIG. 54  is a perspective view of a pump head body in the variation of the fourth exemplary embodiment of the present invention. 
           [0069]      FIG. 55  is a cross sectional view taken against the section line  55 - 55  from previous  FIG. 54 . 
           [0070]      FIG. 56  is a bottom view of a diaphragm membrane in the variation of the fourth exemplary embodiment of the present invention. 
           [0071]      FIG. 57  is a top view of a pump head body in the fifth exemplary embodiment of the present invention. 
           [0072]      FIG. 58  is a bottom view of a diaphragm membrane in the fifth exemplary embodiment of the present invention. 
           [0073]      FIG. 59  is a cross section assembled view for a diaphragm membrane and a pump head body in the fifth exemplary embodiment of the present invention. 
       
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
       [0074]      FIGS. 15 through 59  are illustrative figures for the vibration-reducing method for compressing diaphragm pump of the present invention. The compressing diaphragm pump comprises a motor  10  with an output shaft  11 , a pump head cover  20 , a motor upper chassis  30 , a wobble plate  40  with integral protruding cam-lobed shaft, an eccentric roundel mount  50 , a pump head body  60 , a diaphragm membrane  70 , three pumping pistons  80  and a piston valvular assembly  90 , wherein, except as described below, components included in each part may be the same as those in the conventional compressing diaphragm pump as described above. 
         [0075]    The basic operation mode of the compressing diaphragm pump is as follows: When the motor  10  is powered on, the wobble plate  40  is driven to rotate by the motor output shaft  11  so that three eccentric roundels  52  on the eccentric roundel mount  50  sequentially and constantly move in up-and-down reciprocal stroke. Meanwhile, three pumping pistons  80  and three piston acting zones  73  in the diaphragm membrane  70  are driven by the sequential up-and-down reciprocal stroke of the three eccentric roundels  52  to move in an up-and-down displacement. Thereby, the tap water W, which flows into the piston valvular assembly  90 , is compressed to obtain pressurized water Wp, which is constantly discharged out of the compressing diaphragm pump for being further RO-filtered by the RO-cartridge and used in the reverse osmosis water purification system. 
         [0076]    A vibration-reducing unit is further disposed between the pump head body  60  and diaphragm membrane  70  to reduce the torque of each piston acting zone  73  in the diaphragm membrane  70  by shortening the length of the moment arm that occurs upon the circumnutating action of each eccentric roundels  52  in the eccentric roundel mount  50 , so that the vibration strength of the compressing diaphragm pump is effectively reduced. The vibration-reducing unit includes a pair of mated acting fasteners, which are composed of a pump head body acting fastener  600  (as indicated by the reference number  600  shown in  FIGS. 16 and 18 ) and a mating diaphragm membrane acting fastener  700  (as indicated by the reference number  700  shown in  FIG. 21 ). The pump head body acting fastener  600  is disposed on the upper side of the pump head body  60  while the diaphragm membrane acting fastener  700  is disposed on the bottom side of the diaphragm membrane  70  at a position corresponding to a position of the pump head body acting fastener  600  on the pump head body  60 . By means of the vibration-reducing unit, a length of moment arm L 1  from the sealing raised rim  71  to the periphery of the annular positioning protrusion  75  of the conventional compressing diaphragm pump is shortened into a new length of moment arm L 2  from the basic curved protrusions  76  to the periphery of the annular positioning protrusion  75  for the circumnutating action of each eccentric roundels  52  in the eccentric roundel mount  50  (as indicated by the length of moment arms L 1  and L 2  shown in  FIG. 24 ). 
         [0077]      FIGS. 15 through 22  are illustrative figures for the first exemplary embodiment of the vibration-reducing method for a compressing diaphragm pump utilizing the newly devised vibration-reducing unit in the present invention, wherein the pump head body acting fastener  600  and mating diaphragm membrane acting fastener  700  of the vibration-reducing unit include three basic curved indents  65  (as indicated by the reference number  65  corresponding to reference number  600  shown in  FIGS. 16 and 18 ) and three corresponding basic curved protrusions  76  (as indicated by the reference number  76  corresponding to reference number  700  shown in  FIG. 21 ) respectively. Each basic curved groove  65  is circumferentially disposed around the upper side of each through hole  61  in the pump head body  60  while each basic curved protrusion  76  is circumferentially disposed around each concentric annular positioning protrusion  75  at the bottom side of the mating diaphragm membrane  70  at a position corresponding to a position of each mating basic curved groove  65  in the pump head body  60 . The three basic curved protrusions  76  at the bottom side of the mating diaphragm membrane  70  are completely insert into the corresponding three basic curved grooves  65  at the upper side of the pump head body  60  upon assembly of the pump head body  60  and the mating diaphragm membrane  70  (as shown in  FIG. 22 ). 
         [0078]      FIGS. 23 ,  24  and  13  are illustrative figures for the practical operation result in the first exemplary embodiment of the vibration-reducing method for compressing diaphragm pump with a newly devised vibration-reducing unit according to the present invention. Compared to the operation of conventional compressing diaphragm pump, in which the moment arm L 1  extends from the sealing raised rim  71  to the periphery of the annular positioning protrusion  75  (as shown in  FIGS. 13 and 24 ), the moment arm L 2  of the illustrated embodiment extends from the basic curved protrusions  76  to the periphery of the annular positioning protrusion  75  (as shown in  FIG. 24 ). As a result, the length of moment arm L 2  is shorter than the length of moment arm L 1 , and the resultant torque, calculated by multiplying the acting force F by the length of moment arm, is less than that of the conventional compressing diaphragm pump. As a result of the reduced torque of the present invention, the vibration strength is substantially reduced. According to a pilot test on a sample of the present invention, the vibration strength was only one tenth (10%) of the vibration strength in the conventional compressing diaphragm pump. If the present invention is installed on the housing C of the reverse osmosis purification unit pillowed by a conventional cushion base  100  with a rubber shock absorber  102  (as shown in  FIG. 14 ), the annoying noise caused by resonant shaking in the conventional compressing diaphragm pump can be completely eliminated. 
         [0079]    Each basic curved groove  65  in the first exemplary embodiment can be replaced by a curved slot (not shown in figures). Moreover, the basic curved groove  65  in the pump head body  60  and corresponding basic curved protrusion  76  in the diaphragm membrane  70  can also be exchanged with a basic curved protrusion  65  in the pump head body  60  and corresponding basic curved groove  76  in the diaphragm membrane  70  without affecting their mating condition. 
         [0080]      FIGS. 25 through 31  are illustrative figures for the second exemplary embodiment of the vibration-reducing method for a compressing diaphragm pump with the newly devised vibration-reducing unit of the present invention, wherein the pump head body acting fastener  600  and mating diaphragm membrane acting fastener  700  of the vibration-reducing unit include the basic curved groove  65  paired with an outer second curved groove  66  and corresponding basic curved protrusion  76  paired with an outer second curved protrusion  77  respectively. The outer second curved groove  66  is further circumferentially disposed around each existing basic curved groove  65  in the pump head body  60  (as shown in  FIGS. 25 through 27 ) while the outer second curved protrusion  77  is further circumferentially disposed around each existing curved protrusion  76  in the mating diaphragm membrane  70  at a position corresponding to a position of each mating outer second curved groove  66  in the pump head body  60  (as shown in  FIGS. 29 and 30 ). The paired basic curved protrusions  76  and outer second curved protrusions  77  at the bottom side of the mating diaphragm membrane  70  are completely inserted into corresponding the paired basic curved grooves  65  and outer second curved grooves  66  at the upper side of the pump head body  60  upon assembly of the pump head body  60  and the mating diaphragm membrane  70  (as shown in  FIG. 31 ). The newly devised vibration-reducing unit not only has significant effect in reducing vibration but also enhances the resistance of the eccentric roundel  52  against displacement by the acting force F. 
         [0081]    Each basic curved groove  65  and outer second curved groove  66  in the second exemplary embodiment can also be replaced by curved slots (not shown in figures). Moreover, the paired basic curved groove  65  with outer second curved groove  66  in the pump head body  60  and corresponding paired basic curved protrusion  76  with outer second curved protrusion  77  in the mating diaphragm membrane  70  can be exchanged for a paired basic curved protrusion  65  with outer second curved protrusion  66  in the pump head body  60  and corresponding paired basic curved groove  76  with outer second curved groove  77  in the mating diaphragm membrane  70  without affecting their mating condition. 
         [0082]      FIGS. 32 through 38  are illustrative figures for the third exemplary embodiment of the vibration-reducing method for a compressing diaphragm pump with newly devised vibration-reducing unit according to the present invention, wherein the pump head body acting fastener  600  and mating diaphragm membrane acting fastener  700  of the vibration-reducing unit are a basic indented ring  601  and a corresponding basic protruding ring  701 , respectively. The basic indented ring  601  is circumferentially disposed around the upper side of each through hole  61  in the pump head body  60  (as shown in  FIGS. 32 and 34 ) while the basic protruding ring  701  is circumferentially disposed at the bottom side of each concentric annular positioning protrusion  75  in the mating diaphragm membrane  70  at a position corresponding to a position of each mating basic indented ring  601  in the pump head body  60  (as shown in  FIGS. 36 and 37 ). The three basic protruded rings  701  at the bottom side of the mating diaphragm membrane  70  are completely inserted into the corresponding three basic dented rings  601  at the upper side of the pump head body  60  (as shown in  FIG. 38 ) upon assembly of the pump head body  60  and the mating diaphragm membrane  70 . By means of the vibration-reducing unit in reinforcing steadiness between the basic indented ring  601  and mating basic protruded ring  701 , the effect in reducing vibration is substantially enhanced. 
         [0083]    Each basic indented ring  601  in the third exemplary embodiment can be replaced by a slot ring (not shown in figures). Moreover, the basic indented ring  601  in the pump head body  60  and corresponding basic protruded ring  701  in the mating diaphragm membrane  70  can be exchanged with a basic protruded ring  601  in the pump head body  60  and corresponding basic indented ring  701  in the mating diaphragm membrane  70  without affecting their mating condition. 
         [0084]      FIGS. 39 through 44  are illustrative figures for the fourth exemplary embodiment of the vibration-reducing method for a compressing diaphragm pump with newly devised vibration-reducing unit according to the present invention, wherein the pump head body acting fastener  600  and mating diaphragm membrane acting fastener  700  of the vibration-reducing unit are a plurality of circumferentially located curved indented segments  602  and a plurality of circumferentially located curved protruding segments  702 . The plural circumferentially located curved indented segments  602  are circumferentially disposed around the upper side of each through hole  61  in the pump head body  60  (as shown in  FIGS. 39 and 41 ) while the plural circumferentially located curved protruding segments  702  are circumferentially disposed at the bottom side of each concentric annular positioning protrusion  75  in the mating diaphragm membrane  70  at a position corresponding to a position of each of the mating plural circumferentially located curved indented segments  602  in the pump head body  60  (as shown in  FIGS. 43 and 44 ). The circumferentially located curved protruding segments  702  at the bottom side of the mating diaphragm membrane  70  are completely inserted into the corresponding circumferentially located curved indented segments  602  at the upper side of the pump head body  60  upon assembly of the pump head body  60  and the mating diaphragm membrane  70  so that the effect in reducing vibration is substantially enhanced. The circumferentially located curved in dented segments  602  can be replaced by circumferentially located round holes  603  (as shown in  FIGS. 45 and 47 ) or circumferentially located square holes  604  (as shown in  FIGS. 51 and 53 ) while corresponding circumferentially located curved protruding segments  702  can be adapted into circumferentially located round protrusions  703  (as shown in  FIG. 50 ) or circumferentially located square protrusions  704  (as shown in  FIG. 56 ) such that all these foregoing counterparts have the same effect in reducing vibration. 
         [0085]    Besides, each group of circumferentially located curved indented segments  602  in the fourth exemplary embodiment can be replaced by a group of circumferentially located curved slot segments (not shown in figures). Moreover, the curved indented segments  602  in the pump head body  60  and corresponding curved protruding segments  702  in the mating diaphragm membrane  70  can be exchanged with curved protruding segments  602  in the pump head body  60  and corresponding curved indented segments  702  in the mating diaphragm membrane  70  without affecting their mating condition. Similarly, each group of circumferentially located round holes  603  and square holes  604  can also be replaced by a group of circumferentially located round holes and square holes (not shown in figures). Moreover, the round holes  603  in the pump head body  60  and corresponding round protrusions  703  in the mating diaphragm membrane  70  can be exchanged with the round protrusions  603  in the pump head body  60  and corresponding round holes  703  in the mating diaphragm membrane  70  without affecting their mating condition, while the square holes  604  in the pump head body  60  and corresponding square protrusions  704  in the mating diaphragm membrane  70  can also be exchanged with square protrusions  604  in the pump head body  60  and corresponding square holes  704  in the mating diaphragm membrane  70  without affecting their mating condition as well. 
         [0086]      FIGS. 57 through 59  are illustrative figures for the fifth exemplary embodiment of the vibration-reducing method for a compressing diaphragm pump with newly devised vibration-reducing unit according to the present invention, wherein the pump head body acting fastener  600  and mating diaphragm membrane acting fastener  700  of the vibration-reducing unit are a basic indented ring  601  paired with an outer second indented ring  605  and a corresponding basic protruding ring  701  paired with an outer second protruding ring  705 , respectively. The outer second in dented ring  605  is circumferentially disposed around each basic indented ring  601  in the pump head body  60  (as shown in  FIG. 57 ) while the outer second protruding ring  705  is circumferentially disposed around each basic protruding ring  701  in the mating diaphragm membrane  70  at a position corresponding to a position of each mating outer second indented ring  605  in the pump head body  60  (as shown in  FIG. 58 ). The paired basic protruding ring  701  and outer second protruding ring  705  at the bottom side of the mating diaphragm membrane  70  are completely inserted into the corresponding paired basic indented ring  601  and outer second indented ring  605  at the upper side of the pump head body  60  upon assembly of the pump head body  60  and the mating diaphragm membrane  70  (as shown in  FIG. 59 ). The newly devised vibration-reducing unit not only has a significant effect in reducing vibration but also enhances the resistance of the eccentric roundel  52  against displacement by the acting force F. 
         [0087]    Each basic indented ring  601  and outer second indented ring  605  in the fifth exemplary embodiment can also be replaced by slot rings (not shown in figures). Moreover, the paired basic indented ring  601  with outer second indented ring  605  in the pump head body  60  and corresponding paired basic protruding ring  701  with outer second protruding ring  705  in the mating diaphragm membrane  70  can be exchanged with pair of basic protruding ring  601  with outer second protruding ring  605  in the pump head body  60  and corresponding paired basic indented ring  701  with outer second indented ring  705  in the mating diaphragm membrane  70  without affecting their mating condition. 
         [0088]    Basing on the foregoing disclosure, it is apparent that the present invention substantially achieves a vibration reducing effect in compressing diaphragm pump by means of simple vibration-reducing unit without increasing overall cost. The present invention surely solves all issues of annoying noise and resonant shaking resulting from vibration in the conventional compressing diaphragm pump, thereby providing valuable industrial applicability.