Description
3.1.2 Diaphragm
pump
Design:
The diaphragm pump consists of a pump body and a drive motor.
The pump body consists of a drive shaft and two pump heads. Both pump head contains a
diaphragm and the work valves. The two pump heads are arranged opposite each other. In
the two-stage (Z) diaphragm pump, both pump heads are connected in series.
The pump heads are driven via an eccentric shaft with a connecting rod.
Function:
Motor, eccentric shaft and connecting rod set the diaphragms in stroke movement. This
changes the size of the space between the diaphragms and pump head (pump chamber).
Increasing the size of the pump chamber opens the inlet valve while the outlet valve is clo-
sed (intake process). Decreasing the size of the pump chamber ejects the gas through the
outlet valve.
The valves are actuated by the gas being pumped. A large proportion of fluid in the dia-
phragm pump minimizes the pumping efficiency.
Component
Materials
Connection- / pump head
PTFE with carbon-fibre reinforcing
Seal EPDM
Screw fitting
PVDF / PP
Valves PEEK
Diaphragm
fabric reinforced with a PTFE layer
Connecting elements
PP
PTFE with carbon-fibre reinforcement, electrically conductive (with manufacturer's certificate
of electrical conductivity).
Material resistance to aggressive media see: “Kunststoff Kautschuk Produkte“, Jahreshand-
buch der Verarbeiter 2000/2001 ("Plastic, Rubber Products“, Annual Handbook of the Proc-
essor 2000/2001), Publisher Hoppenstedt Darmstadt, Vienna, Zurich.
Gas ballast :
Opening the gas ballast valve
(17)
in the
suction line of the last pump stage allows
air to flow into the pump chamber. This
prevents condensation and flushes the
pump clear.
Operation leads to:
- Increasing the ultimate pressure and
- Increasing the operating temperature.
Fig. 2 Diaphragm pump MPC 101 Z
115022 Ilmvac
GmbH
11