| 摘要 |
A diaphragm pump wherein the lower portion of an upright housing surrounds an eccentric extending into the annular lower end portion of the one-piece connecting rod the upper end portion of which extends through the central openings of two discs flanking the apertured central portion of a flexible diaphragm whose marginal portion is sealingly clamped between the main housing portion and a cover overlying the diaphragm. The top part of the upper end portion of the connecting rod is deformed to constitute a rivet head which sealingly fills the opening of at least one disc and urges the discs as well as the central portion of the diaphragm against the S-shaped surface of a carrier forming part of the connecting rod and serving to support the underside of the adjacent disc. The cover carries a first valve which opens when the diaphragm is flexed downwardly to admit a fluid into a pump chamber at the upper side of the diaphragm, and a second valve which opens the diaphragm is flexed upwardly to discharge a metered quantity of fluid from the chamber. The lower portion of the housing constitutes an oil sump for the eccentric, for the lower end portion of the connecting rod and for the shaft which drives the eccentric by way of a freewheel. The supply of oil in the sump can be replenished by way of a normally sealed port in the lower portion of the housing.
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