| 摘要 |
PURPOSE: A diaphragm is provided which is capable of smooth liquid supplying as well as preventing deformation, breakage, and the like of the diaphragm due to strong pushing of the diaphragm to a delivery port, when a diaphragm pump is operated. CONSTITUTION: A diaphragm of a diaphragm pump(1) is pushed strongly against a discharge opening during operation to provide smooth fluid transfer of the pumped fluid and to avoid deformation or rupture of the diaphragm(4). At its extreme discharge position, the diaphragm is blocked from entering the discharge opening(20) by a perforated diaphragm protecting device(8) covering the fluid discharge opening. Selection of the size of openings in the diaphragm protecting device, appropriate for the materials being pumped, allows smooth movement of pumped fluid in the pump through the pumped fluid discharge opening. In one embodiment, the diaphragm protecting device is a movable perforated plate which is resiliently urged open, and which is pushed closed when the diaphragm reaches its extreme discharge position.
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