Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
289 words
Hydraulically driven diaphragm pump with a diaphragm clamped on the edge between a pump body and a pump cover, which diaphragm 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 movable 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 said diaphragm work chamber and said piston work chamber, which slide opens a connection from the reservoir to the piston work chamber in or beyond the suction stroke end position of the diaphragm, characterized in 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, in such a way that at its diaphragm-side end the control slide (19) has a support plate (31) which is designed so that together with the associated pump body face (10) of the diaphragm work chamber (9) it forms a virtually gap-free mechanical support face (10, 10', 10"), adapted to the natural diaphragm geometry, for the diaphragm (1) in the suction stroke end position thereof, and that the control slide (19) has at its piston-side end a second control valve (20) with a valve element (21) which in or beyond 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).
Claim 2
Dependent Claim
289 words
Hydraulically driven diaphragm pump with a diaphragm clamped on the edge between a pump body and a pump cover, which diaphragm 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 movable 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 said diaphragm work chamber and said piston work chamber, which slide opens a connection from the reservoir to the piston work chamber in or beyond the suction stroke end position of the diaphragm, characterized in 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, in such a way that at its diaphragm-side end the control slide (19) has a support plate (31) which is designed so that together with the associated pump body face (10) of the diaphragm work chamber (9) it forms a virtually gap-free mechanical support face (10, 10', 10"), adapted to the natural diaphragm geometry, for the diaphragm (1) in the suction stroke end position thereof, and that the control slide (19) has at its piston-side end a second control valve (20) with a valve element (21) which in or beyond 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).
Claim 3
Dependent Claim
30 words
Diaphragm pump according to claim 1, characterized in that the mechanical support face (10, 10', 10") for the diaphragm (1) is made bore-free in the suction stroke end position thereof.
Claim 4
Dependent Claim
43 words
Diaphragm pump according to claim 1, characterized in that the second control valve (20) is a disk valve whose valve element designed as valve disk (21) closes the connecting duct or ducts (8) in the pressure stroke limit position of the diaphragm (1).
Claim 5
Dependent Claim
70 words
Diaphragm pump according to claim 1, characterized in that the valve element (21) of the second control valve (20) is fastened to one end of a valve stem (22) which is slidably guided in the control slide (19) of the first control valve, coaxially thereto, and by its other end applies against the diaphragm (1) under spring force, so that it senses the diaphragm (1) on the entire diaphragm stroke.
Claim 6
Dependent Claim
49 words
Diaphragm pump according to claim 4, characterized in that the control slide (19) of the first control valve is tensioned in the direction of the diaphragm (1) by a spring (23) which is stronger than the spring (24) tensioning the valve stem (22) of the second control valve (20).
Claim 7
Dependent Claim
30 words
Diaphragm pump according to claim 5, characterized in that the spring (24) tensioning the valve stem (22) of the second control valve (20) is supported on the control slide (19).
Claim 8
Dependent Claim
39 words
Diaphragm pump according to claim 1, characterized in that the control slide (19) has at its piston-side end a stop (29) which limits the displacement path of the control slide (19) in the direction of the diaphragm pressure stroke.