Device for supplying air to a suction side of a pump, component unit having such a device and wiper system

A wiper system for cleaning a vehicle window, comprising:

• a supply container for a washer fluid;
• a pump for suctioning the washer fluid from the supply container;
• and
• at least one duct for supplying a cleaning medium from a pressure side of the pump to a spraying nozzle which is realized for spraying the cleaning medium onto the vehicle window in a wiping area of at least one wiper blade, and
• a suction side of the pump being at least indirectly connected to a device to supply air, in addition to the washer fluid, so that the air is suctioned from the pump via the suction side of the pump to produce a foam-like cleaning medium from the washer fluid and the air at the pressure side,
• wherein the device for supplying the air comprises:
• a suction channel for suctioning the air, the suction channel being able to be fluidly connected to the suction side of the pump,
• wherein the suction channel comprises a first section and a second section;
• wherein the device is realized as a component separate from the pump;
• a connection area for connecting the device with the supply container for the washer fluid;
• an additional connection area for a suction nozzle of the pump,
• wherein the second section radially surrounds the suction nozzle to form a supply gap fluidly connected to the suction side of the pump;
• and
• a check valve disposed in the suction channel, the check valve being realized for opening and closing as a function of a negative pressure on the suction nozzle of the pump,
• whereby when the check valve is opened, the air enters an area of the suction nozzle of the pump, and when the check valve is closed, no air is sucked.