Pumps – Three or more cylinders arranged in parallel – radial – or...
Patent
1979-01-23
1981-08-11
Freeh, William L.
Pumps
Three or more cylinders arranged in parallel, radial, or...
F04B 112
Patent
active
042831660
ABSTRACT:
A single metal sheet suction reed valve member having a plurality of radial outwardly extending reeds which is held between a cylinder block having a plurality of axial cylinders in spaced annular relation and a valve plate together with a gasket, is formed with radial outwardly extending fingers between adjacent reeds. The end surface of the cylinder block is formed with a spot faced recess at the central region which connects all cylinders and which receives the suction reed valve member. The spot faced recess is formed with a radius greater than a distance from the center of the cylinder block to a point on an opening edge of one of the cylinders in symmetry with another point on the opening edge intersecting with a side edge of the corresponding reed in relation to an imaginary line connecting between the centers of adjacent cylinders. Each finger extends to the periphery of the spot faced recess and covers the bottom surface region of the recess between adjacent cylinders. Thus, the fluid leakage path between adjacent cylinders along the arcuate edge or the extending end of each finger is relatively long so that fluid leakage may be substantially prevented.
Each finger may be formed sufficiently wide so as to extend to adjacent reeds and to overlap adjacent cylinders. Thus, the reexpanding volume of the fluid in each cylinder is reduced.
REFERENCES:
patent: 3215341 (1965-11-01), Francis
patent: 3552886 (1971-01-01), Olson, Jr.
patent: 3817660 (1974-06-01), Knowles et al.
patent: 4011029 (1977-03-01), Shimizu
Freeh William L.
Sankyo Electric Company Limited
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