Importance

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Abstract

In a hydraulically driven diaphragm pump, which is provided with a diaphragm clamped on the edge which separates a delivery chamber from a hydraulic chamber, the hydraulic chamber being subdivided into a diaphragm work chamber and a piston work chamber connected therewith via at least one connecting duct, a hydraulic diaphragm drive in the form of an oscillating displacement piston which is displaceable in the pump body between a reservoir for the hydraulic fluid and the piston work chamber, and with a diaphragm position-controlled leakage makeup device which comprises a control valve with a control slide displaceably guided in the zone of the connecting duct between diaphragm work chamber and piston work chamber, which slide opens--in the suction stroke end position of the diaphragm--a connection from the reservoir to the piston work chamber, the arrangement is made in such a way that the control slide (19) of the leakage makeup device is provided at its two ends with devices (31; 20) for stroke path limitation of the diaphragm (1) clamped freely swinging. For this purpose the control slide (19) has at its diaphragm-side end a support plate (31 ) which together with the associated pump body face (10) of the diaphragm work chamber (9) forms a virtually gap-free mechanical support face (10, 10', 10') adapted to the natural diaphragm geometry, for the diaphragm in the suction stroke end position thereof. As distinguished therefrom the control slide (19) has at its piston-side end a second control valve (20) with a valve element (21) which in the pressure stroke end position of the diaphragm (1) interrupts the hydraulic connection from the piston work chamber (5) to the diaphragm work chamber (9).

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First Claim