Abstract:
A vibration-reducing structure for compressing diaphragm pump features a pump head body and a diaphragm membrane. The pump head body includes four operating holes, a first curved vibration-reducing positioning structure circumferentially disposed around the upper side of each operating hole, and or a linked four-curve positioning structure that collectively extends around all of the operating holes. The diaphragm membrane includes four equivalent piston acting zones and second curved vibration-reducing position structures situated at positions corresponding to the positions of the first curved vibration-reducing positioning structures. The first positioning structures in the pump head body, which may be grooves, slots, perforations, or protrusions, mate with the corresponding second positioning structures in the diaphragm membrane to reduce the moment arm generated during pumping by movement of the diaphragm membrane, which may be protrusions, grooves, slots, or perforations, thereby generating less torque to decrease the strength of vibrations and vibration noise.

Description:
[0001]    This application claims the benefit of provisional U.S. Patent Application No. 61/000,622, filed May 20, 2014, and incorporated herein by reference. 
     
    
     FIELD OF THE PRESENT INVENTION 
       [0002]    The present invention relates to a vibration-reducing structure for a four-compression-chamber diaphragm pump, and particularly to a structure that can reduce the vibration strength of the pump so that the annoying noise incurred by the consonant vibration with the housing of an RO purification system is eliminated when the vibration-reducing structure is installed on the water supplying apparatus in either a house, recreational vehicle, or mobile home. 
       BACKGROUND OF THE INVENTION 
       [0003]    Conventional compressing diaphragm pumps of the type used with a RO (Reverse Osmosis) purifier or RO water purification system, and which are popularly installed on the water supplying apparatus of houses, recreational vehicles or mobile homes, come in various types. Other than the specific type disclosed in U.S. Pat. No. 6,840,745, the majority of conventional four-compression-chamber diaphragm pumps can be categorized as similar in design to the one shown in  FIGS. 1 through 9 . The conventional four-compressing-chamber diaphragm pump shown therein essentially comprises a motor  10  with an output shaft  11 , an motor upper chassis  30 , a wobble plate with an integral protruding cam-lobed shaft  40 , an eccentric roundel mount  50 , a pump head body  60 , a diaphragm membrane  70 , four pumping pistons  80 , a piston valvular assembly  90  and a pump head cover  20 . 
         [0004]    The motor upper chassis  30  includes a bearing  31  through which an output shaft  11  of the motor  10  extends. The motor upper chassis  30  also includes an upper annular rib ring  32  with several fastening bores  33  evenly and circumferentially disposed in a rim of the upper annular rib ring  32 . 
         [0005]    The wobble plate  40  includes a shaft coupling hole  41  through which the corresponding motor output shaft  11  of the motor  10  extends. 
         [0006]    The eccentric roundel mount  50  includes a central bearing  51  at the bottom thereof for receiving the corresponding wobble plate  40 . Four eccentric roundels  52  even and circumferentially disposed on the eccentric roundel mount  50 . Each eccentric roundel  52  has a screw-threaded bore  54  and an annular positioning groove  55  formed in the top face thereof respectively. 
         [0007]    The pump head body  60  covers the upper annular rib ring  32  of the motor upper chassis  30  to encompass the wobble plate  40  with integral protruding cam-lobed shaft and eccentric roundel mount  50  therein, and includes four operating holes  61  evenly and circumferentially disposed therein. Each operating hole  61  has an inner diameter that is slightly bigger than the outer diameter of each corresponding eccentric roundel  52  in the eccentric roundel mount  50  for receiving each corresponding eccentric roundel  52  respectively, a lower annular flange  62  formed thereunder for mating with corresponding upper annular rib ring  32  of the motor upper chassis  30 , and several fastening bores  63  evenly disposed around a circumference of the pump head body  60 . 
         [0008]    The diaphragm membrane  70 , which is extrusion-molded from a semi-rigid elastic material and placed on the pump head body  60 , includes a pair of parallel rims, including outer raised rim  71  and inner raised rim  72 , as well as four evenly spaced radial raised partition ribs  73 . Each end of respective radial raised partition ribs  73  connect with the inner raised rim  72 , thereby forming four equivalent piston acting zones  74  within the radial raised partition ribs  73 , wherein each piston acting zone  74  has an acting zone hole  75  created therein in correspondence with a respective screw-threaded bore  54  in the screw-threaded bore  53  of the eccentric roundel mount  50 , and an annular positioning protrusion  76  for each acting zone hole  75  is formed at the bottom side of the diaphragm membrane  70  (as shown in  FIGS. 7 and 8 ). 
         [0009]    Each pumping piston  80 , which is respectively disposed in each corresponding piston acting zones  74  of the diaphragm membrane  70 , has a tiered hole  81  extending therethrough. After each of the annular positioning protrusions  76  in the diaphragm membrane  70  has been inserted into each corresponding annular positioning groove  55  in the eccentric roundel  52  of the eccentric roundel mount  50 , respective fastening screws  1  are inserted through the tiered hole  81  of each pumping piston  80  and the acting zone hole  75  of each corresponding piston acting zone  74  in the diaphragm membrane  70 , so that the diaphragm membrane  70  and four pumping pistons  80  can be securely screwed into screw-threaded bores  54  of the corresponding four eccentric roundels  52  in the eccentric roundel mount  50  (as can be seen in the enlarged portion of  FIG. 9 ). 
         [0010]    Piston valvular assembly  90 , which suitably covers the diaphragm membrane  70 , includes a downwardly extending raised rim  91  for insertion between the outer raised rim  71  and inner raised rim  72  of the diaphragm membrane  70 , a central round outlet mount  92  having a central positioning bore  93  with four equivalent sectors, each of which contains a group of multiple evenly circumferentially-located outlet ports  95 , a T-shaped plastic anti-backflow valve  94  with a central positioning shank, and four circumferentially-adjacent inlet mounts  96 . Each of the inlet mounts  96  includes a group of multiple evenly circumferentially-located inlet ports  97  and an inverted central piston disk  98  respectively so that each piston disk  98  serves as a valve for each corresponding group of multiple inlet ports  97 , wherein the central positioning shank of the plastic anti-backflow valve  94  mates with the central positioning bore  93  of the central outlet mount  92  and the group of multiple outlet ports  95  in the central round outlet mount  92  are communicable with the four inlet mounts  96 . A hermetically-sealed preliminary-compression chamber  26  is formed in each inlet mount  96  and corresponding piston acting zone  74  in the diaphragm membrane  70  when downwardly extending rim  91  is inserted between the outer raised rim  71  and inner raised rim  72  of the diaphragm membrane  70 , such that one end of each preliminary-compression chamber  26  is communicable with each corresponding group of multiple inlet ports  97  (as shown in the enlarged portion of  FIG. 9 ). 
         [0011]    The pump head cover  20 , which covers the pump head body  60  to encompass the piston valvular assembly  90 , pumping piston  80  and diaphragm membrane  70  therein, includes a water inlet orifice  21 , a water outlet orifice  22 , and several fastening bores  23 . A tiered rim  24  and an annular rib ring  25  are disposed in the bottom inside of the pump head cover  20  such that the outer rim for the assembly of diaphragm membrane  70  and piston valvular assembly  90  can be hermetically attached to the tiered rim  24  (as shown in the enlarged portion of  FIG. 9 ). A high-compression chamber  27  is configured between the cavity formed by the inside wall of the annular rib ring  25  and the central outlet mount  92  of the piston valvular assembly  90  by means of matching the bottom of the annular rib ring  25  and the rim of the central outlet mount  92  (as shown in  FIG. 9 ). 
         [0012]    By running each fastening bolt  2  through each corresponding fastening bore  23  of pump head cover  20  and each corresponding fastening bore  63  in the pump head body  60 , and then putting a nut  3  onto each fastening bolt  2  to securely screw the pump head cover  20  to the pump head body  60 , the whole assembly of the four-compression-chamber diaphragm pump is finished (as shown in  FIGS. 1 and 9 ). 
         [0013]      FIGS. 10 and 11  are illustrative figures showing a practical operation mode for the conventional four-compression-chamber diaphragm pump of  FIGS. 1-9 . 
         [0014]    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 four eccentric roundels  52  on the eccentric roundel mount  50  sequentially and constantly move in an up-and-down reciprocal stroke. 
         [0015]    Secondly, in the meantime, the four pumping pistons  80  and four piston acting zones  73  in the diaphragm membrane  70  are sequentially driven by the up-and-down reciprocal stroke of the four eccentric roundels  52  to move in an up-and-down displacement. 
         [0016]    Thirdly, when the eccentric roundel  52  moves in a down stroke, causing pumping piston  80  and piston acting zone  74  to be displaced downwardly, the piston disk  98  in the piston valvular assembly  90  is pushed into an open status so that tap water W can flow into the preliminary-compression chamber  26  via water inlet orifice  21  in the pump head cover  20  and inlet ports  97  in the piston valvular assembly  90  (as indicated by the arrowhead extending from W in the enlarged view of  FIG. 10 ). 
         [0017]    Fourthly, when the eccentric roundel  52  moves in an up stroke, causing pumping piston  80  and piston acting zone  74  to be 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 preliminary-compression chamber  26  and increase the water pressure therein up to a range of 80 psi-100 psi. The resulting pressurized water Wp causes the plastic anti-backflow valve  94  in the piston valvular assembly  90  to be pushed to an open status. 
         [0018]    Fifthly, when the plastic anti-backflow valve  94  in the piston valvular assembly  90  is pushed to an open status, the pressurized water Wp in the preliminary-compression chamber  26  is directed into high-compression chamber  27  via the group of outlet ports  95  for the corresponding sector in the central outlet mount  92 , and then expelled out of the water outlet orifice  22  in the pump head cover  20  (as shown in  FIG. 11  and indicated by arrowhead Wp). 
         [0019]    Finally, orderly iterative action for each group of outlet ports  95  for the four sectors in central outlet mount  92  causes the pressurized water Wp to be constantly discharged out of the conventional four-compression-chamber diaphragm pump to be further RO-filtered by the RO-cartridge so that the final filtered pressurized water Wp can be used in a reverse osmosis water purification system. 
         [0020]    Referring to  FIGS. 12 through 13 , a serious vibration-related drawback has long existed in the above-described conventional four-compression-chamber 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 four eccentric roundels  52  on the eccentric roundel mount  50  constantly and sequentially move in an up-and-down reciprocal stroke, and in the meantime four pumping pistons  80  and four piston acting zones  74  in the diaphragm membrane  70  are sequentially driven by the up-and-down reciprocal stroke of four eccentric roundels  52  to move in an up-and-down displacement so that an equivalent force F constantly acts on the four piston acting zones  74  with a length of moment arm L 1  measured from the outer raised rim  71  to the periphery of the annular positioning protrusion  76  (as shown in  FIG. 13 ). Thereby, a resultant torque is created by the acting force F, multiplying the length of moment arm L 1  as shown by the formula “torque=acting force F×length of moment arm L 1 .” The resultant torque causes the whole conventional four-compressing-chamber diaphragm pump to vibrate directly. With a high rotational speed of the motor output shaft  11  in the motor  10  up to a range of 800-1200 rpm, the vibrating strength caused by alternate acting of the four eccentric roundels  52  can reach a persistently unacceptable condition. 
         [0021]    To address the direct-vibration drawbacks of the conventional four-compression-chamber diaphragm pump, as shown in  FIG. 14 , a cushion base  100  with a pair of wing plates  101  is always provided as a supplemental support. Each wing plate  101  is further sleeved by a rubber shock absorber  102  for vibration suppressing enhancement. Upon installation of the conventional four-compression-chamber diaphragm pump in the water supplying apparatus of a house, recreational vehicle or mobile home, 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 . However, the practical vibration suppressing efficiency of the foregoing cushion base  100  with wing plates  101  and rubber shock absorber  102  only affects the primary direct vibration, while reducing overall vibration only to a limited degree because the primary direct vibration causes a secondary vibration to occur as a result of resonant shaking of the housing C. The resonant shaking causes the overall vibration noise of the housing C of the reverse osmosis purification unit to become stronger. 
         [0022]    In addition to the drawback of increasing overall vibration noise of the housing C, a further drawback occurs in that the water pipe P connected to the water outlet orifice  22  of the pump head cover  20  will synchronously shake in resonance with the primary vibration described above (as indicated by the broken-line depictions of water pipe P in  FIGS. 14 and 14   a ). This synchronous shaking of the water pipe P will result in still further drawbacks by causing other rest parts of the conventional compressing diaphragm pump to simultaneously shake. As a result, after a certain period, water leakage of the conventional compressing diaphragm pump will occur due to gradual loosening of the connection between water pipe P and water outlet orifice  22 , as well as gradual loosening of the fit between other parts affected by the shaking 
         [0023]    The additional drawbacks of overall resonant shaking and water leakage in the conventional four-compression-chamber diaphragm pump cannot be solved by the conventional way of addressing the foregoing primary vibration drawback. How to substantially reduce all the drawbacks associated with the operating vibration of the four-compression-chamber diaphragm pump has become an urgent and critical issue. 
       SUMMARY OF THE INVENTION 
       [0024]    An objective of the present invention is to provide a vibration-reducing structure for four-compressing-chamber diaphragm pump features of a pump head body and a diaphragm membrane, in which the pump head body includes four operating holes and at least one basic curved groove, slot, or perforated segment, or a curved protrusion or set of protrusions, circumferentially disposed around at least a portion of the upper side of each operating hole, and in which the diaphragm membrane includes four equivalent piston acting zones each of which has an acting zone hole, an annular positioning protrusion for each acting zone hole, and at least one basic curved protrusion or set of protrusions, or a groove, slot, or perforated segment, at least partially circumferentially disposed around each concentric annular positioning protrusion at a position corresponding to the position of each mating basic curved groove, slot, perforated segment, protrusions, or sets of protrusions in the pump head body, so that the four basic curved protrusions, sets of protrusions, grooves, slots, or perforated segments are completely inserted into or received by the corresponding four basic curved grooves, slots, perforated segments, protrusions, or sets of protrusions in the pump head body with a short length of moment arm to generate less torque, the torque being obtained by multiplying the length of the moment arm by a constant acting force. With less torque, the vibration strength of the compressing diaphragm pump is substantially reduced. 
         [0025]    Another objective is to provide a vibration-reducing structure for four-compressing-chamber diaphragm pump features of a pump head body with at least four basic curved grooves, slots or perforated segments, or curved protrusions, and a diaphragm membrane with four basic curved protrusions, or curved grooves, slots, or perforated segments, such that the four basic curved protrusions, grooves, slots, or perforated segments are completely inserted into the corresponding four basic curved grooves, slots, perforated segments, or protrusions with a short length of moment arm that generates less torque, the torque being obtained by multiplying the length of the moment arm with a constant acting force. With less torque, the vibration strength of the compressing diaphragm pump is substantially reduced. By having the present invention installed on the housing of the reverse osmosis purification unit of a water supplying apparatus in either a house, recreational vehicle or mobile home, the housing being further cushioned by a conventional cushion base with a rubber shock absorber, the annoying noise caused by resonant shaking in the conventional compressing diaphragm pump can be completely eliminated. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0026]      FIG. 1  is a perspective assembled view of a conventional four-compression-chamber diaphragm pump. 
           [0027]      FIG. 2  is a perspective exploded view of a conventional four-compression-chamber diaphragm pump. 
           [0028]      FIG. 3  is a perspective view of a pump head body for the conventional four-compression-chamber diaphragm pump. 
           [0029]      FIG. 4  is a cross sectional view taken against the section line  4 - 4  from previous  FIG. 3 . 
           [0030]      FIG. 5  is a top view of a pump head body for the conventional four-compression-chamber diaphragm pump. 
           [0031]      FIG. 6  is a perspective view of a diaphragm membrane for the conventional four-compression-chamber diaphragm pump. 
           [0032]      FIG. 7  is a cross sectional view taken against the section line  7 - 7  from previous  FIG. 6 . 
           [0033]      FIG. 8  is a bottom view of a diaphragm membrane for the conventional four-compression-chamber diaphragm pump. 
           [0034]      FIG. 9  is a cross sectional view taken against the section line  9 - 9  from previous  FIG. 1 . 
           [0035]      FIG. 10  is the first operation illustrative view of a conventional four-compression-chamber diaphragm pump. 
           [0036]      FIG. 11  is the second operation illustrative view of a conventional four-compression-chamber diaphragm pump. 
           [0037]      FIG. 12  is the third operation illustrative view of a conventional four-compression-chamber diaphragm pump. 
           [0038]      FIG. 13  is a partially enlarged view taken from circled-portion “a” in the enlarged view of  FIG. 12 . 
           [0039]      FIG. 14  is a schematic side view showing a conventional four-compression-chamber diaphragm pump installed on a mounting base in a reverse osmosis purification system. 
           [0040]      FIG. 14(   a ) is a schematic end view of the conventional four-compression-chamber diaphragm pump installed on a mounting base, as illustrated in  FIG. 14 . 
           [0041]      FIG. 15  is a perspective exploded view of a the first exemplary embodiment of the present invention. 
           [0042]      FIG. 16  is a perspective view of a pump head body in the first exemplary embodiment of the present invention. 
           [0043]      FIG. 17  is a cross sectional view taken against the section line  17 - 17  from previous  FIG. 16 . 
           [0044]      FIG. 18  is a top view of a pump head body in the first exemplary embodiment of the present invention. 
           [0045]      FIG. 19  is a perspective view of a diaphragm membrane in the first exemplary embodiment of the present invention. 
           [0046]      FIG. 20  is a cross sectional view taken against the section line  20 - 20  from previous  FIG. 19 . 
           [0047]      FIG. 21  is a bottom view of a diaphragm membrane in the first exemplary embodiment of the present invention. 
           [0048]      FIG. 22  is an assembled cross sectional view of the first exemplary embodiment of the present invention. 
           [0049]      FIG. 23  is an operation illustrative view of the first exemplary embodiment of the present invention. 
           [0050]      FIG. 24  is a partially enlarged view taken from circled-portion “a” of previous  FIG. 23 . 
           [0051]      FIG. 25  is a perspective view of another pump head body in the first exemplary embodiment of the present invention. 
           [0052]      FIG. 26  is a cross sectional view taken against the section line  26 - 26  from previous  FIG. 25 . 
           [0053]      FIG. 27  is a cross sectional view of another pump head body and separated diaphragm membrane in the first exemplary embodiment of the present invention. 
           [0054]      FIG. 28  is a cross sectional view of another combination of the pump head body and diaphragm membrane of  FIG. 27 . 
           [0055]      FIG. 29  is a perspective view of a pump head body in the second exemplary embodiment of the present invention. 
           [0056]      FIG. 30  is a cross sectional view taken against the section line  30 - 30  from previous  FIG. 29 . 
           [0057]      FIG. 31  is a top view of a pump head body in the second exemplary embodiment of the present invention. 
           [0058]      FIG. 32  is a perspective view of a diaphragm membrane in the second exemplary embodiment of the present invention. 
           [0059]      FIG. 33  is a cross sectional view taken against the section line  33 - 33  from previous  FIG. 32 . 
           [0060]      FIG. 34  is a bottom view of a diaphragm membrane in the second exemplary embodiment of the present invention. 
           [0061]      FIG. 35  is a cross sectional view of a combination of the pump head body and diaphragm membrane in the second exemplary embodiment of the present invention. 
           [0062]      FIG. 36  is a perspective view of a another pump head body in the second exemplary embodiment of the present invention. 
           [0063]      FIG. 37  is a cross sectional view taken against the section line  37 - 37  from previous  FIG. 36 . 
           [0064]      FIG. 38  is a cross sectional view of another pump head body and separated diaphragm membrane in the second exemplary embodiment of the present invention. 
           [0065]      FIG. 39  is a cross sectional view a combination of pump head body and diaphragm membrane of  FIG.28 . 
           [0066]      FIG. 40  is a perspective view of a pump head body in the third exemplary embodiment of the present invention. 
           [0067]      FIG. 41  is a cross sectional view taken against the section line  41 - 41  from previous  FIG. 40 . 
           [0068]      FIG. 42  is a top view of a pump head body in the third exemplary embodiment of the present invention. 
           [0069]      FIG. 43  is a perspective view of a diaphragm membrane in the third exemplary embodiment of the present invention. 
           [0070]      FIG. 44  is a cross sectional view taken against the section line  44 - 44  from previous  FIG. 43 . 
           [0071]      FIG. 45  is a bottom view of a diaphragm membrane in the third exemplary embodiment of the present invention. 
           [0072]      FIG. 46  is a cross sectional view of a combination of the pump head body and diaphragm membrane in the third exemplary embodiment of the present invention. 
           [0073]      FIG. 47  is a perspective view of another pump head body in the third exemplary embodiment of the present invention. 
           [0074]      FIG. 48  is a cross sectional view taken against the section line  48 - 48  from previous  FIG. 47 . 
           [0075]      FIG. 49  is a cross sectional view of another pump head body and separated diaphragm membrane in the third exemplary embodiment of the present invention. 
           [0076]      FIG. 50  is a cross sectional view of a combination of the pump head body and diaphragm membrane of  FIG. 49 . 
           [0077]      FIG. 51  is a perspective view of a pump head body in the fourth exemplary embodiment of the present invention. 
           [0078]      FIG. 52  is a cross sectional view taken against the section line  52 - 52  from previous  FIG. 51 . 
           [0079]      FIG. 53  is a top view of a pump head body in the fourth exemplary embodiment of the present invention. 
           [0080]      FIG. 54  is a perspective view of a diaphragm membrane in the fourth exemplary embodiment of the present invention. 
           [0081]      FIG. 55  is a cross sectional view taken against the section line of  55 - 55  from previous  FIG. 54 . 
           [0082]      FIG. 56  is a bottom view of a diaphragm membrane in the fourth exemplary embodiment of the present invention. 
           [0083]      FIG. 57  is a cross sectional view of a combination of the pump head body and diaphragm membrane in the fourth exemplary embodiment of the present invention. 
           [0084]      FIG. 58  is a perspective view of another pump head body in the fourth exemplary embodiment of the present invention. 
           [0085]      FIG. 59  is a cross sectional view taken against the section line of  59 - 59  from previous  FIG. 58 . 
           [0086]      FIG. 60  is a cross sectional view of another pump head body and separated diaphragm membrane in the fourth exemplary embodiment of the present invention. 
           [0087]      FIG. 61  is a cross sectional view of a combination of the pump head body and diaphragm membrane of  FIG. 60 . 
           [0088]      FIG. 62  is a perspective view of a pump head body in the fifth exemplary embodiment of the present invention. 
           [0089]      FIG. 63  is a cross sectional view taken against the section line  63 - 63  from previous  FIG. 62 . 
           [0090]      FIG. 64  is a top view of a pump head body in the fifth exemplary embodiment of the present invention. 
           [0091]      FIG. 65  is a perspective view of a diaphragm membrane in the fifth exemplary embodiment of the present invention. 
           [0092]      FIG. 66  is a cross sectional view taken against the section line  66 - 66  from previous  FIG. 65 . 
           [0093]      FIG. 67  is a bottom view of a diaphragm membrane in the fifth exemplary embodiment of the present invention. 
           [0094]      FIG. 68  is a cross sectional view of a combination of the pump head body and diaphragm membrane in the fifth exemplary embodiment of the present invention. 
           [0095]      FIG. 69  is a perspective view of another pump head body in the fifth exemplary embodiment of the present invention. 
           [0096]      FIG. 70  is a cross sectional view taken against the section line  70 - 70  from previous  FIG. 69 . 
           [0097]      FIG. 71  is a cross sectional view of another pump head body and separated diaphragm membrane in the fifth exemplary embodiment of the present invention. 
           [0098]      FIG. 72  is a cross sectional view of a combination of the pump head body and diaphragm membrane of  FIG. 71 . 
           [0099]      FIG. 73  is a perspective view of a pump head body in the sixth exemplary embodiment of the present invention. 
           [0100]      FIG. 74  is a cross sectional view taken against the section line  74 - 74  from previous  FIG. 73 . 
           [0101]      FIG. 75  is a top view of a pump head body in the sixth exemplary embodiment of the present invention. 
           [0102]      FIG. 76  is a perspective view of a diaphragm membrane in the sixth exemplary embodiment of the present invention. 
           [0103]      FIG. 77  is a cross sectional view taken against the section line  77 - 77  from previous  FIG. 76 . 
           [0104]      FIG. 78  is a bottom view of a diaphragm membrane in the sixth exemplary embodiment of the present invention. 
           [0105]      FIG. 79  is a cross sectional view of a combination of the pump head body and diaphragm membrane in the sixth exemplary embodiment of the present invention. 
           [0106]      FIG. 80  is a perspective view of another pump head body in the sixth exemplary embodiment of the present invention. 
           [0107]      FIG. 81  is a cross sectional view taken against the section line  81 - 81  from previous  FIG. 80 . 
           [0108]      FIG. 82  is a cross sectional view of another pump head body and separated diaphragm membrane in the sixth exemplary embodiment of the present invention. 
           [0109]      FIG. 83  is a cross sectional view of a combination of the pump head body and diaphragm membrane of  FIG. 82 . 
           [0110]      FIG. 84  is a perspective view of a pump head body in the seventh exemplary embodiment of the present invention. 
           [0111]      FIG. 85  is a cross sectional view taken against the section line  85 - 85  from previous  FIG. 84 . 
           [0112]      FIG. 86  is a top view of a pump head body in the seventh exemplary embodiment of the present invention. 
           [0113]      FIG. 87  is a perspective view of a diaphragm membrane in the seventh exemplary embodiment of the present invention. 
           [0114]      FIG. 88  is a cross sectional view taken against the section line  88 - 88  from previous  FIG. 87 . 
           [0115]      FIG. 89  is a bottom view of a diaphragm membrane in the seventh exemplary embodiment of the present invention. 
           [0116]      FIG. 90  is a cross sectional view of a combination of the pump head body and diaphragm membrane of  FIG. 89 . 
           [0117]      FIG. 91  is a perspective view of a pump head body in the seventh exemplary embodiment of the present invention. 
           [0118]      FIG. 92  is a cross sectional view taken against the section line  92 - 92  from previous  FIG. 91 . 
           [0119]      FIG. 93  is a cross sectional view of another pump head body and separated diaphragm membrane in the seventh exemplary embodiment of the present invention. 
           [0120]      FIG. 94  is a cross sectional view of a combination of the pump head body and diaphragm membrane of  FIG. 93 . 
           [0121]      FIG. 95  is a top view of a pump head body in the eighth exemplary embodiment of the present invention. 
           [0122]      FIG. 96  is a cross sectional view taken against the section line  96 - 96  from previous  FIG. 95 . 
           [0123]      FIG. 97  is a bottom view of a diaphragm membrane in the eighth exemplary embodiment of the present invention. 
           [0124]      FIG. 98  is a cross sectional view taken against the section line  98 - 98  from previous  FIG. 97 . 
           [0125]      FIG. 99  is a cross sectional view of a combination of the pump head body and diaphragm membrane in the eighth exemplary embodiment of the present invention. 
           [0126]      FIG. 100  is a perspective view of another pump head body in the eighth exemplary embodiment of the present invention. 
           [0127]      FIG. 101  is a cross sectional view taken against the section line  101 - 101  from previous  FIG. 100 . 
           [0128]      FIG. 102  is a cross sectional view of another pump head body and separated diaphragm membrane in the eighth exemplary embodiment of the present invention. 
           [0129]      FIG. 103  is a cross sectional view of the combination of pump head body and diaphragm membrane of  FIG. 102 . 
       
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
       [0130]      FIGS. 15 through 22  are illustrative figures of a first exemplary embodiment of a vibration-reducing structure for a four-compression-chamber diaphragm pump. 
         [0131]    A basic curved groove  65  is circumferentially disposed around a portion of the upper side of each operating hole  61  in the pump head body  60  while a basic curved protrusion  77  is circumferentially disposed around a portion of each concentric annular positioning protrusion  76  at the bottom side of the diaphragm membrane  70  at positions corresponding to the positions of the mating basic curved grooves  65  in the pump head body  60  (as shown in  FIGS. 20 and 21 ) so that each of the basic curved protrusions  77  at the bottom side of the diaphragm membrane  70  is completely inserted into each corresponding basic curved groove  65  in the upper side of the pump head body  60  upon assembly of the pump head body  60  and the diaphragm membrane  70 , resulting in a shortened length of moment arm L 2  from the basic curved protrusion  77  to the periphery of the annular positioning protrusion  76  in the diaphragm membrane  70  during operation of the present invention (as shown in  FIG. 22  and associated enlarged view). 
         [0132]    A comparison of  FIGS. 23 ,  24 ,  13 ,  14 , and  14 ( a ), reveals practical operation results for the first exemplary embodiment, which are typical of those obtained for the various exemplary embodiments of the vibration-reducing structure of the present invention). 
         [0133]    Comparing the operation of the conventional four-compression-chamber diaphragm pump shown in  FIG. 13  to the operation of the four-compression-chamber diaphragm pump shown in  FIG. 24 , a length of moment arm L 1  from the outer raised rim  71  to the periphery of the annular positioning protruding block  76  of the diaphragm membrane  70 , as shown in  FIG. 13 , is shorter than a length of moment arm L 2  from the basic curved protrusions  77  to the periphery of the annular positioning protruding block  76  of the diaphragm membrane  70 , shown in  FIG. 24 . 
         [0134]    When the resultant torque is calculated by multiplying the same acting force F by the length of moment arm, the resultant torque of the present invention represented by the embodiment illustrated in  FIG. 24  is smaller than that of the conventional four-compression-chamber diaphragm pump shown in  FIG. 13  since the length of moment arm L 2  is shorter than the length of moment arm L 1 . 
         [0135]    Because of the smaller resultant torque of the present invention, the related vibration strength is substantially reduced. 
         [0136]    In a practical test of a prototype of the present invention, the vibration strength was reduced to less than one tenth (10%) of the vibration strength in the conventional four-compression-chamber diaphragm pump. 
         [0137]    If the present invention is installed on the housing C of a reverse osmosis purification unit of a water supplying apparatus for a house, recreational vehicle or mobile home, such that it is also cushioned by a conventional cushion base  100  with a rubber shock absorber  102  (as shown in  FIG. 14 ), the undesirable noise caused by resonant shaking that occurs in the conventional four-compression-chamber diaphragm pump can be completely eliminated. 
         [0138]    As shown in  FIGS. 25 and 26 , in the first exemplary embodiment, each basic curved groove  65  of the pump head body  60  can be replaced by a basic curved slot  64  that extends through the pump head body  60 . 
         [0139]    As shown in  FIGS. 27 and 28 , in the first exemplary embodiment, each basic curved groove  65  in the pump head body  60  (shown in detail in  FIGS. 16 and 17 ) and each corresponding basic curved protrusion  77  in the diaphragm membrane  70  (shown in detail in  FIGS. 20 and 21 ) can be respectively replaced by a basic curved protrusion  651  in the pump head body  60  (as shown in  FIG. 27 ) and a corresponding basic curved groove  771  in the diaphragm membrane  70  (as shown in  FIG. 28 ) without affecting their mating condition. 
         [0140]    Each basic curved protrusion  651  at the upper side of the pump head body  60  is completely inserted into each corresponding basic curved groove  771  at the bottom side of the diaphragm membrane  70  upon assembly of the pump head body  60  and the diaphragm membrane  70  (as shown in  FIG. 28 ), with the result that a shortened length of moment arm L 3  from the basic curved groove  771  to the peripheral of the annular positioning protrusion  76  in the diaphragm membrane  70  is also obtained in the operation of the present invention (as shown in  FIG. 28  and the associated enlarged view), so that the newly devised contrivances of pump head body  60  and diaphragm membrane  70  have a significant effect in reducing vibration as well. 
         [0141]    Referring to  FIGS. 29 through 35 , which are illustrative figures for the second exemplary embodiment of the vibration-reducing structure for a four-compression-chamber diaphragm pump of the present invention. 
         [0142]    The four basic curved grooves  65  in the pump head body  60  shown in  FIGS. 16 and 17  can be replaced by a single linked four-curve groove  68  that encompasses all four operating holes  61 , as shown in  FIGS. 29 through 31 , while each of the four corresponding basic curved protrusions  77  in the diaphragm membrane  70  shown in  FIGS. 20 through 21  can be replaced by a single linked four-curve protrusion  79  at a position corresponding to the position linked four-curved groove  68  in the pump head body  60 , to encompass all four annular positioning protrusions  76  as shown in  FIGS. 33 and 34 . 
         [0143]    The linked four-curve protrusion  79  at the bottom side of the diaphragm membrane  70  may be completely inserted into the corresponding linked four-curve groove  68  in the upper side of the pump head body  60  upon assembly of the pump head body  60  and the diaphragm membrane  70  (as shown in  FIG. 35  and the associated enlarged view), resulting in a relatively short length of moment arm L 2  from the linked four-curve protrusion  79  to the periphery of the annular positioning protrusion  76  in the diaphragm membrane  70  during operation of the present invention (as shown in  FIG. 35  and the associated enlarged view). The shortened length of the moment arm L 2  has a significant effect in reducing vibration. 
         [0144]    As shown in  FIGS. 36 and 37 , in the second exemplary embodiment, each linked four-curve groove  68  in the pump head body  60  can be replaced by a linked four-curve slot  641 . 
         [0145]    Alternatively, as shown in  FIGS. 38 and 39 , the linked four-curve groove  68  in the pump head body  60  of the second exemplary embodiment (as shown in  FIGS. 29 to 31 ) and the corresponding linked four-curve protrusion  79  in the diaphragm membrane  70  (as shown in  FIGS. 33 and 34 ) can be replaced by a linked four-curve protrusion  681  in the pump head body  60  (as shown in  FIG. 38 ) and a linked four-curve groove  791  in the diaphragm membrane  70  (as shown in  FIG. 38 ) without affecting their mating condition. 
         [0146]    Thereby, the linked four-curve protrusion  681  at the upper side of the pump head body  60  may be completely inserted into the linked four-curve groove  791  in the bottom side of the diaphragm membrane  70  upon assembly of the pump head body  60  and the diaphragm membrane  70  (as shown in  FIG. 39 ) to achieve a short length of moment arm 
         [0147]    L 3  from the linking four-curve groove  791  to the periphery of the annular positioning protrusion  76  in the diaphragm membrane  70  during operation of the present invention (as shown in  FIG. 39  and enlarged view of association), with a resultant significant reduction in vibrations. 
         [0148]      FIGS. 40 through 46  are illustrative figures showing a third exemplary embodiment of a vibration-reducing structure for a four-compression-chamber diaphragm pump in the present invention. 
         [0149]    A second outer curved groove  66  is further circumferentially disposed around each basic curved groove  65  in the pump head body  60  (as shown in  FIGS. 40 through 42 ) while a second outer curved protrusion  78  is further circumferentially disposed around each basic curved protrusion  77  in the diaphragm membrane  70  at a position corresponding to a position of each mating second outer curved groove  66  in the pump head body  60  (as shown in  FIGS. 44 and 45 ). 
         [0150]    Thereby, each pair of basic curved protrusion  77  and second outer curved protrusion  78  at the bottom side of the diaphragm membrane  70  is able to be completely inserted into each pair of corresponding basic curved groove  65  and second outer curved groove  66  at the upper side of the pump head body  60  upon assembly of the pump head body  60  and the diaphragm membrane  70  (as shown in  FIG. 46  and the associated enlarged view), with the result that a short length of moment arm L 2  from the basic curved protrusion  77  to the periphery of the annular positioning protrusion  76  in the diaphragm membrane  70  is obtained during the operation of the present invention (as shown in  FIG. 46  and the associated enlarged view), thereby achieving significantly reduced vibration as well as enhanced stability in preventing displacement and maintaining the length of moment arm L 2  for resisting the acting force F on the eccentric roundel  52 . 
         [0151]    As shown in  FIGS. 47 and 48 , in the third exemplary embodiment, each pair of basic curved groove  65  and second outer curved groove  66  of the pump head body  60  can be replaced by a pair of bores including a basic curved bore  64  and second outer curved bore  67 . 
         [0152]    Alternatively, as shown in  FIGS. 49 and 50 , in the third exemplary embodiment, each pair of basic curved groove  65  and second outer curved groove  66  in the pump head body  60  (as shown in  FIGS. 40 to 42 ) and each corresponding pair of basic curved protrusion  77  and second outer curved protrusion  78  in the diaphragm membrane  70  (as shown in  FIGS. 44 and 45 ) can be respectively exchanged for a pair of basic curved protrusion  651  and second outer curved protrusion  661  in the pump head body  60  (as shown in  FIG. 49 ) and a pair of corresponding basic curved groove  771  and second outer curved groove  781  in the diaphragm membrane  70  (as shown in  FIG. 49 ) without affecting their mating condition. 
         [0153]    Thereby, each pair of basic curved protrusion  651  and second outer curved protrusion  661  at the upper side of the pump head body  60  is completely inserted into each corresponding pair of basic curved groove  771  and second outer curved groove  781  at the bottom side of the diaphragm membrane  70  upon assembly of the pump head body  60  and the diaphragm membrane  70  (as shown in  FIG. 50 ), resulting in a shortened length of moment arm L 3  from the basic curved groove  771  to the periphery of the annular positioning protrusion  76  in the diaphragm membrane  70  during operation of the present invention (as shown in  FIG. 50  and the associated enlarged view) in order to significantly reduce vibration and provide enhanced stability in maintaining the length of moment arm L 3 . 
         [0154]      FIGS. 51 through 57  are illustrative figures showing a fourth exemplary embodiment of a vibration-reducing structure for a four-compression-chamber diaphragm pump. 
         [0155]    An integral annular groove  601  is circumferentially disposed around each said operating hole  61  in the pump head body  60  (as shown in  FIGS. 51 through 53 ) while an integral protruding ring or annular protrusion  701  is circumferentially disposed around each annular positioning protrusion  76  in the diaphragm membrane  70  at a position corresponding to a position of each mating integral annular groove  601  in the pump head body  60  (as shown in  FIGS. 55 and 56 ). 
         [0156]    Each integral annular protrusion  701  at the bottom side of the diaphragm membrane  70  is completely inserted into each corresponding integral annular groove  601  at the upper side of the pump head body  60  upon assembly of the pump head body  60  and the diaphragm membrane  70  (as shown in  FIG. 57 ), 
         [0157]    thereby shortening a length of moment arm L 2  from the integral annular protrusion  701  to the periphery of the annular positioning protrusion  76  in the diaphragm membrane  70  during operation of the present invention (as shown in  FIG. 57  and the associated enlarged view), 
         [0158]    and consequently reducing vibration while enhancing the stability of the moment arm L 2  against the acting force F on the eccentric roundel  52 . 
         [0159]    As shown in  FIGS. 58 and 59 , in the fourth exemplary embodiment, each integral annular groove  601  of the pump head body  60  may be replaced by an integral perforated ring  600 . 
         [0160]    Also, as shown in  FIGS. 60 and 61 , in the fourth exemplary embodiment, each integral annular groove  601  in the pump head body  60  (as shown in  FIGS. 51 to 53 ) and each corresponding integral annular protrusion  701  in the diaphragm membrane  70  (as shown in  FIGS. 55 and 56 ) may be replaced by an integral protruding ring or annular protrusion  610  in the pump head body  60  (as shown in  FIG. 60 ) and a corresponding integral annular groove  710  in the diaphragm membrane  70  (as shown in  FIG. 60 ) without affecting their mating condition. 
         [0161]    Each integral annular protrusion  610  at the upper side of the pump head body  60  is completely inserted into each corresponding integral annular groove  710  at the bottom side of the diaphragm membrane  70  upon assembly of the pump head body  60  and the diaphragm membrane  70  (as shown in  FIG. 61 ). As a result, a shortened length of moment arm L 3  from the integral annular groove  710  to the periphery of the annular positioning protrusion  76  in the diaphragm membrane  70  is obtained during operation of the present invention (as shown in  FIG. 61  and the associated enlarged view) and vibrations are consequently reduced. 
         [0162]      FIGS. 62 through 68  are illustrative figures for the fifth exemplary embodiment of a vibration-reducing structure for a four-compression-chamber diaphragm pump of the present invention. 
         [0163]    A group of curved grooves  602  are circumferentially disposed around each operating hole  61  in the pump head body  60  (as shown in  FIGS. 62 through 64 ) while a group of curved protrusions  702  are circumferentially disposed around each annular positioning protrusion  76  in the diaphragm membrane  70  at a position corresponding to a position of a respective group of mating curved grooves  602  in the pump head body  60  (as shown in  FIGS. 66 and 67 ). 
         [0164]    Each group of curved protrusions  702  at the bottom side of the diaphragm membrane  70  is completely inserted into each corresponding group of curved dents  602  at the upper side of the pump head body  60  upon assembly of the pump head body  60  and the diaphragm membrane  70  (as shown in  FIG. 68 ), with the result that a short length of moment arm L 2  from the curved protrusion  702  to the periphery of the annular positioning protrusion  76  in the diaphragm membrane  70  is obtained during operation of the present invention (as also shown in  FIG. 68  and the associated enlarged view), resulting insignificantly reduced vibration. 
         [0165]    As shown in  FIGS. 69 and 70 , in the fifth exemplary embodiment, each group of curved grooves  602  of the pump head body  60  can be replaced by a group of curved slits  611 . 
         [0166]    As shown in  FIGS. 71 and 72 , in the fifth exemplary embodiment, each group of curved grooves  602  in the pump head body  60  (as shown in  FIGS. 62 to 64 ) and each corresponding group of curved protrusions  702  in the diaphragm membrane  70  (as shown in  FIGS. 66 and 67 ) can be respectively exchanged for a group of curved protrusions  620  in the pump head body  60  (as shown in  FIG. 71 ) and a group of corresponding curved grooves  720  in the diaphragm membrane  70  (as shown in  FIG. 71 ) without affecting their mating condition. 
         [0167]    Each group of curved protrusions  620  at the upper side of the pump head body  60  is completely inserted into each group of corresponding curved grooves  720  at the bottom side of the diaphragm membrane  70  upon assembly of the pump head body  60  and the diaphragm membrane  70  (as shown in  FIG. 72 ), with the result that a short length of moment arm L 3  from the curved dents  720  to the periphery of the annular positioning protrusion  76  in the diaphragm membrane  70  is also obtained in the operation of the present invention (as shown in  FIG. 72  and the associated enlarged view) so that the newly devised contrivances of pump head body  60  and diaphragm membrane  70  have a significant effect in reducing vibration. 
         [0168]      FIGS. 73 through 79  are illustrative figures for the sixth exemplary embodiment of a vibration-reducing structure for a four-compression-chamber diaphragm pump according to the present invention. 
         [0169]    A group of round indents  603  are circumferentially disposed around each operating hole  61  in the pump head body  60  (as shown in  FIGS. 73 through 75 ) while a group of round protrusions  703  are circumferentially disposed around each annular positioning protrusion  76  in the diaphragm membrane  70  at a position corresponding to a position each group of mating round indents  603  in the pump head body  60  (as shown in  FIGS. 77 and 78 ). 
         [0170]    Each group of round protrusions  703  at the bottom side of the diaphragm membrane  70  is completely inserted into each corresponding group of round indents  603  at the upper side of the pump head body  60  upon assembly of the pump head body  60  and the diaphragm membrane  70  (as shown in  FIG. 79 ), resulting in a moment arm L 2  of decreased length that extends from the round protrusion  703  to the periphery of the annular positioning protrusion  76  in the diaphragm membrane  70  during operation of the present invention (as shown in  FIG. 79  and the associated enlarged view), the decrease in length of the moment arm L 2  having a significant effect in reducing vibration as well as preventing displacement of, and maintaining stability in the length of, moment arm L 2 . 
         [0171]    As shown in  FIGS. 69 and 70 , in the sixth exemplary embodiment, each group of round indents  603  in the pump head body  60  may be replaced by a group of round through-holes or bores  612 . 
         [0172]    As shown in  FIGS. 82 and 83 , in the sixth exemplary embodiment, each group of round indents  603  in the pump head body  60  (as shown in  FIGS. 73 to 75 ) and each corresponding group of round protrusions  703  in the diaphragm membrane  70  (as shown in  FIGS. 77 and 78 ) may also be replaced by a group of round protrusions  630  in the pump head body  60  (as shown in  FIG. 82 ) and a group of corresponding round indents  730  in the diaphragm membrane  70  (as shown in  FIG. 82 ) without affecting their mating condition. 
         [0173]    Each group of round protrusions  630  at the upper side of the pump head body  60  is completely inserted into each group of corresponding round indents  730  at the bottom side of the diaphragm membrane  70  upon assembly of the pump head body  60  and the diaphragm membrane  70  (as shown in  FIG. 83 ), thereby obtaining a short length of moment arm L 3  from the round dents  730  to the periphery of the annular positioning protrusion  76  in the diaphragm membrane  70  during operation of the present invention (as shown in  FIG. 83  and the associated enlarged view) and consequently reducing vibration. 
         [0174]      FIGS. 84 through 90  are illustrative figures for the seventh exemplary embodiment of a vibration-reducing structure for a four-compression-chamber diaphragm pump according to the present invention. 
         [0175]    A group of square indents  604  are circumferentially disposed around each operating hole  61  in the pump head body  60  (as shown in  FIGS. 84 through 86 ) while a group of square protrusions  704  are circumferentially disposed around each annular positioning protrusion  76  in the diaphragm membrane  70  at a position corresponding to a position of each mating group of square indents  604  in the pump head body  60  (as shown in  FIGS. 88 and 89 ). 
         [0176]    Each group of square protrusions  704  at the bottom side of the diaphragm membrane  70  is completely inserted into each corresponding group of square indents  604  at the upper side of the pump head body  60  upon assembly of the pump head body  60  and the diaphragm membrane  70  (as shown in  FIG. 90 ) to obtain a short length of moment arm L 2  from the square protrusions  704  to the periphery of the annular positioning protrusion  76  in the diaphragm membrane  70  during operation of the present invention (as shown in  FIG. 60  and the associated enlarged view), the steadily maintained, displacement resistant, shortened length of the moment art L 2  having a significant effect in reducing vibration. 
         [0177]    As shown in  FIGS. 91   and    92 , in the seventh exemplary embodiment, each group of square indents  604  in the pump head body  60  can be replaced by a group of square holes  613 . 
         [0178]    As shown in  FIGS. 93   and    94  in the seventh exemplary embodiment, each group of square indents  604  in the pump head body  60  (as shown in  FIGS. 84 to 86 ) and each corresponding group of square protrusions  704  in the diaphragm membrane  70  (as shown in  FIGS. 88 and 89 ) can be exchanged for a group of square protrusions  640  in the pump head body  60  (as shown in  FIG. 93 ) and a group of corresponding square indents  740  in the diaphragm membrane  70  (as shown in  FIG. 93 ) without affecting their mating condition. 
         [0179]    Each group of square protrusions  640  at the upper side of the pump head body  60  is completely inserted into each group of corresponding square indents  740  at the bottom side of the diaphragm membrane  70  upon assembly of the pump head body  60  and the diaphragm membrane  70  (as shown in  FIG. 94 ) thereby obtaining a short length of moment arm L 3  from the square indents  740  to the periphery of the annular positioning protrusion  76  in the diaphragm membrane  70  during operation of the present invention (as shown in  FIG. 94  and the associated enlarged view) and a significant reduction in vibrations. 
         [0180]      FIGS. 95 through 99  are illustrative figures for the eighth exemplary embodiment of a vibration-reducing structure for a four-compression-chamber diaphragm pump according to the present invention. 
         [0181]    An integral annular groove  601  is circumferentially disposed around the upper side of each operating hole  61  and a linked four-curve indent  68  is disposed to encompass all four integral indented rings  601  in the pump head body  60  (as shown in  FIGS. 95 and 96 ) while an integral protruding ring  701  is circumferentially disposed around each concentric annular positioning protrusion  76  and a linked four-curve protrusion  79  is disposed to encompass all four integral protruding rings  701  at the bottom side of the diaphragm membrane  70  at a position corresponding to a position of the mating linked four-curve indent  68  and four integral indented rings  601  in the pump head body  60  (as shown in  FIGS. 97 and 98 ). 
         [0182]    The linked four-curve protrusion  79  and four integral protruding rings  701  at the bottom side of the diaphragm membrane  70  are completely inserted into the corresponding linked four-curve indent  68  and four integral indented rings  601  at the upper side of the pump head body  60  upon assembly of the pump head body  60  and the diaphragm membrane  70  (as shown in  FIG. 99  and the associated enlarged view) such that a shortened length of moment arm L 2  from the integral protruding ring  701  to the periphery of the annular positioning protrusion  76  in the diaphragm membrane  70  is obtained during operation of the present invention (as shown in  FIG. 99  and the associated enlarged view) to reduce vibrations by enhancing stability in the length of moment arm L 2  and resistance against the acting force F on the eccentric roundel  52 . 
         [0183]    As shown in  FIGS. 100 and 101 , in the eighth exemplary embodiment, the linked four-curve indent  68  and four integral indented rings  601  in the pump head body  60  can be replaced by a linked four-curve slit  641  and four integral perforated rings  600 . 
         [0184]    As shown in  FIGS. 102 and 103 , in the eighth exemplary embodiment, the linked four-curve indent  68  and four integral indented rings  601  in the pump head body  60  (as shown in  FIGS. 95 and 96 ), and the corresponding linked four-curve protrusion  79  and four integral protruding rings  701  in the diaphragm membrane  70  (as shown in  FIGS. 97 and 98 ), can be exchanged for a linked four-curve protrusion  681  and four integral protruding rings  610  in the pump head body  60  (as shown in  FIG. 102 ) and a corresponding linked four-curve indent  791  and four integral indented rings  710  in the diaphragm membrane  70  (as shown in  FIG. 102 ) without affecting their mating condition. 
         [0185]    The linking four-curve protrusion  681  and four integral protruding rings  610  at the upper side of the pump head body  60  are completely inserted into the corresponding linked four-curve indent  791  and four integral indented rings  710  at the bottom side of the diaphragm membrane  70  upon assembly of the pump head body  60  and the diaphragm membrane  70  (as shown in  FIG. 103 ) to obtain a shortened length of moment arm L 3  from the integral annular groove  710  to the periphery of the annular positioning protrusion  76  in the diaphragm membrane  70  during operation of the present invention (as shown in  FIG. 103  and the associated enlarged view) and thereby significantly reduce vibrations. 
         [0186]    Based on the foregoing disclosure, the present invention substantially achieves a vibration reducing effect in the four-compression-chamber diaphragm pump by means of simple newly devised pump head body  60  and diaphragm membrane  70  without increasing overall cost. The present invention surely resolves all issues of undesired noise and resonant shaking that result from vibrations in the conventional four-compression-chamber diaphragm pump, which has valuable industrial applicability.