| 摘要 |
A breast pump for pumping milk from a woman's breast comprises a breast hood to be applied onto the woman's breast. A suction chamber communicates with said breast hood, and a suction pump communicates with the suction chamber. A milk collecting vessel or other space receives the milk that is pumped from the woman's breast. Between said suction chamber and the milk collecting means is a check valve. In communication with the suction chamber and the suction pump is an overflow protection for protecting the suction pump from being flooded by an excess of milk. The overflow protection comprises an valve housing elongated along a longitudinal axis. The housing has two opposing end walls, a first one of which including an entrance opening nearer to the suction chamber, the second end wall defining an outlet opening nearer to the suction pump. Within the valve housing is an elongated valve body movable along the longitudinal axis of the housing and is provided with an impact surface opposite the entrance opening. The impact surface extends substantially transversely to the direction of entrance flow through the entrance opening so that is impacted by any milk on the way to flood the suction pump. A shutter surface of the valve body is arranged in the region of the outlet opening in order to be able to obturate it. The overflow protection has an elongated by-passing space which extends from the region of the entrance opening to the outlet opening and communicates with them, thus by-passing the valve body over an elongated pathway as long as the latter is not impacted by milk and does not obturate the outlet opening. |
