Diaphragm pump device and diaphragm pump having a diaphragm pump device and an actuation device

A membrane pump device for conveying fluids, comprising:

• an actuating device;
• at least one elastic membrane;
• a pump chamber body in which a recess, that is closed by the at least one elastic membrane to form a pump chamber, is constructed;
• an inward flow path that connects an entry connection to an inlet opening of the pump chamber;
• an outward flow path that connects an outlet opening of the pump chamber to an exit connection;
• an inlet valve provided in the inward flow path for influencing a flow of liquid in the inward flow path;
• and
• an outlet valve provided in the outward flow path for influencing a flow of liquid in the outward flow path, wherein
• the outlet valve is a membrane valve that has an outlet valve body in which a recess is constructed that is closed by the at least one elastic membrane to form an outlet valve chamber in which an outlet valve seat is arranged,
• a front face of the outlet valve seat faces the at least one elastic membrane and, in the open position of the outlet valve, is arranged at a distance from the at least one elastic membrane,
• an outlet valve channel passes through the outlet valve seat,
• the outward flow path comprises a first outward flow channel that directly connects the outlet opening of the pump chamber to the outlet valve chamber in a state in which the at least one elastic membrane closes the outlet valve channel and comprises a second outward flow channel that connects the outlet valve channel to the exit connection,
• the second outward flow channel is closable with the at least one elastic membrane,
• a cross-sectional area of the outlet valve seat is smaller than a cross-sectional area of a region of the outlet valve chamber surrounding the outlet valve seat,
• the inlet valve is a membrane valve that has an inlet valve body in which a recess is constructed that is closed by the at least one elastic membrane to form an inlet valve chamber in which an inlet valve seat is arranged,
• a front face of the inlet valve seat faces the at least one elastic membrane and, in the open position of the inlet valve, is arranged at a distance from the at least one elastic membrane,
• an inlet valve channel passes through the inlet valve seat,
• the inward flow path comprises a first inlet flow channel, that directly connects the entry connection to the inlet valve channel, and comprises a second inlet flow channel that connects the inlet valve chamber to the inlet opening of the pump chamber,
• the second inlet flow channel is closable with the at least one elastic membrane,
• the actuating device is constructed such that the membrane of the pump chamber is deformed between a suction configuration and a discharge configuration,
• the inlet and outlet valves are capable of being alternately opened and closed so that fluid can be conveyed by the membrane pump,
• the actuating device has an outlet adjusting device that has an outlet control element for deforming the at least one elastic membrane, which is spring-loaded in a rest position in which the at least one elastic membrane sits on the outlet valve seat so that the outlet valve is closed,
• the outlet control element is configured to move out of the rest position into a functioning position in which the at least one elastic membrane is arranged at a distance from the outlet valve seat so that the outlet valve is open,
• the actuating device has an inlet adjusting device that has an inlet control element for deforming the at least one elastic membrane,
• the inlet control element is spring-loaded in a rest position wherein the at least one elastic membrane sits on the inlet valve seat so that the inlet valve is closed,
• the inlet control element is capable of being moved out of the rest position into a functioning position in which the at least one elastic membrane is arranged at a distance from the inlet valve seat so that the inlet valve is open,
• the actuating device has a first working fluid line for supplying the inlet adjusting device with a working fluid for actuating the inlet control element, and a second working fluid line for supplying the outlet adjusting device with a working fluid for actuating the outlet control element, and
• the inlet adjusting device has a first working fluid valve for influencing a cross-section of the first working fluid line and the outlet adjusting device has a second working fluid valve for influencing a cross-section of the second working fluid line, wherein the first working fluid valve is constructed as a switching valve and the second working fluid valve is constructed as a proportional valve.