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 The
basic construction of a diaphragm pump is simple (see Figure
1). An elastic diaphragm (1), clamped, pressure-tight, between
the pump head (2) and the housing (3), separates the transfer
compartment (7) from the interior of the housing. The diaphragm
is connected, pressure tight, to the connecting rod (4) with
the diaphragm-fixing screw (6). A drive in the interior of the
housing sets the connecting rod in oscillation and causes the
diaphragm to move up and down. In the downward thrust, the diaphragm
sucks in the medium via the suction valve (8). In the upward
thrust, it forces out the medium via the pressure valve (9).
Three different techniques are used for driving the diaphragm
pumps for gases: drive via an eccentric drives; drive using
a magnetic vibrator system; and, as a special constructional
design for higher pressures, hydraulic drive. The type of drive
to a large extent determines the capacity of the diaphragm pump
flow rate - working pressure and maximum vacuum.
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