Device for flow restriction on a pump and pump device having such a device

Abstract

A device (2) for restricting the throughflow quantity at a pump (3), in particular at a suction-throttled delivery pump for fuel injection systems of air-compressing, self-igniting internal combustion engines, has a feed channel (4) on the suction side of the pump (3), which feed channel (4) is connected on an outlet side (8) to an inlet (9) of a pump (3), a cut-off channel (6) which can be connected on its inlet side (10) at least indirectly to an outlet (12) of the pump (3) and which opens on its outlet side (13) laterally at an opening point (14) into the feed channel (4), and a pressure control valve (7) which is arranged in the cut-off channel (6). Furthermore, a throttle (5) is provided which is arranged in the feed channel (4) between the opening point (14) and the outlet side (8) of the feed channel (4). A transverse flow is caused at the opening point (14) by a cut-off quantity which is discharged via the cut-off channel (6), which transverse flow is superimposed with a main flow through the feed channel (4). As a result, a lateral incident flow of the throttle (5) can be achieved, as a result of which the effective throttle diameter is reduced. A given pressure difference at the pump (3) can therefore be reduced. Furthermore, Furthermore, a pump arrangement (1) with the pump (3) and the device (2) for restricting the throughflow quantity is disclosed.

Description

technical field [0001] The invention relates to a device for flow limitation on pumps, in particular on suction-restricted delivery pumps, and to a pump device having such a device. In particular, the invention relates to the field of fuel injection devices for air-compressed self-ignition internal combustion engines. Background technique [0002] A high-pressure pump for a fuel injection system of an internal combustion engine is known from DE 10 2004 028 999 A1. The known high-pressure pump has at least one pump element with a pump piston that is driven in a stroke movement and is movably guided in a cylinder bore of the pump housing part, in which the pump piston delimits A pump studio. The pump working chamber can be filled with fuel via an inlet valve during the suction stroke of the pump piston. In this case, the pump working chamber is connected to the delivery pump via a fuel inlet channel extending in the pump housing. [0003] It is conceivable for the delivery...

AI Technical Summary

Problems solved by technology

Here, the delivery volume and the pressure build-up via the pressure regulator valve are limited

However, this results in the disadvantage that when a large injection quantity is required, the excess volume at the pressure control valve and thus the pressure for filling the delivery pump is reduced, while when a small injection quantity is required at the pressure control valve The excess volume on the becomes larger and thus the pressure used to fill the delivery pump increases, although in this case no increase is required

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