초록 ▼

A displacement pump with a pump housing containing a pump chamber of varying volume, the limiting walls of which includes a moveable portion or diaphragm, the movement and/or deformation of which varies the pump chamber volume. The pump chamber has a fluid inlet on the suction side of the pump and a

A displacement pump with a pump housing containing a pump chamber of varying volume, the limiting walls of which includes a moveable portion or diaphragm, the movement and/or deformation of which varies the pump chamber volume. The pump chamber has a fluid inlet on the suction side of the pump and a fluid outlet on the pressure side. Both the fluid inlet and the fluid outlet, or possibly only one of them, includes a flow controlling element having one diffuser and one diffuser inlet which, for the same flow, has a larger pressure drop in one flow direction (the nozzle direction) than in the opposite flow direction (the diffuser direction). A drive element is coupled to the diaphragm, whereby the diaphragm can be caused to oscillate, so that the fluid volume in the pump chamber is caused to pulsate and thereby produce a net flow of fluid through the pump.

대표청구항 ▼

[We claim:] [1.]a pump housing with a pumping chamber having a variable volume for providing pumping action, said pumping chamber having an inlet and an outlet for a fluid to be pumped wherein a flow passage from the inlet to the outlet is substantially open during the pumping cycle;a flow control a

[We claim:] [1.]a pump housing with a pumping chamber having a variable volume for providing pumping action, said pumping chamber having an inlet and an outlet for a fluid to be pumped wherein a flow passage from the inlet to the outlet is substantially open during the pumping cycle;a flow control arrangement for controlling the direction of flow through the pump, said flow arrangement comprising in at least one of said inlet and said outlet a flow controlling means;said flow controlling means having one diffuser inlet portion and one diffuser portion as seen in a direction of flow through the pump, said flow controlling means includes a rounded shape at an inlet region forming a smooth transition from a surrounding wall;said diffuser inlet portion having walls admitting a converging flow creating a pressure drop from a pressure maximum at an entrance of the flow controlling means, to an entrance of the diffuser portion;said diffuser portion having diverging walls causing a substantially diverging flow and a pressure increase; andsaid flow controlling means being adapted, for a given flow, to effect a smaller pressure drop in the direction of flow through the pump than in an opposite direction of flow.