The Fleuss Pump
المؤلف:
GEORGE A. HOADLEY
المصدر:
ESSENTIALS OF PHYSICS
الجزء والصفحة:
P-160
2025-11-10
21
- One of the most satisfactory mechanical air pumps is the Fleuss or Geryk pump, a diagram of which is shown in Fig. 1, while Fig. 2 shows the pump itsėlf. The cylinder is separated into two compartments by a diaphragm D. There is an opening in this diaphragm, which is closed by a collar C, through which passes the piston rod, forming an airtight joint. The collar is kept down by the pressure of a spring S, and the lower part of each compartment is filled with a heavy oil. When the piston is raised, the valve V
closes, the oil above it is raised and the air compressed, until the shoulder on the piston piston strikes C and raises it, when the air and a part of the oil pass through into the upper chamber. When the piston is lowered, a part of the oil runs back to the lower compartment, but the air, being above the oil, cannot run through. The chamber B is connected to the space from which the air is to be exhausted. The tube T connects B with the cylinder below the piston, thus preventing the formation of a vacuum there when the piston rises. The oil makes the valves air-tight, so that this pump is easy to work and of high efficiency.
FIG.2
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