Pumps – Motor driven – Fluid motor
Patent
1981-12-29
1984-02-07
Smith, Leonard E.
Pumps
Motor driven
Fluid motor
417389, 417395, 92 86, 92 98R, F04B 4306
Patent
active
044300484
ABSTRACT:
In a diaphragm pump the diaphragm separating the delivery chamber from the working chamber is clamped between a cylinder body and a cylinder cover in pressure-balancing arrangement. For this purpose a pressure-balancing space is provided to be radially outside and to encircle said diaphragm clamping surface, the pressure balancing space communicating with the working chamber through at least one communicating passage. Furthermore, a separate annular seal member is disposed to be radially outside the pressure balancing space chamber between the cylinder cover and the cylinder body to seal-off the pressure balancing space and the working chamber from the outside. This enables the diaphragm pump to be used at discharge pressures far greater than 350 bars and simultaneously permits the use of plastic diaphragms which are reliable in operation and have a large displacement capacity.
REFERENCES:
patent: 2202313 (1940-05-01), Grove
patent: 2348248 (1944-05-01), Elliott
patent: 2575398 (1951-11-01), Schroeder
patent: 2578746 (1951-12-01), Scherger et al.
patent: 2693827 (1954-11-01), Bailey
patent: 2907339 (1959-10-01), Reinecke et al.
patent: 2916255 (1959-12-01), Koehler
patent: 3661060 (1972-05-01), Bowen
LEWA Herbert Ott GmbH & Co.
Smith Leonard E.
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