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6
Functional description
Power end functional description
Functional description of the diaphragm
liquid end
The metering pump MAKRO TZ is an oscillating, continuously adjustable
diaphragm pump. It is driven by an AC standard motor, the power end
rotation of which is stepped down by a worm gear (1), transmitted via an
adjustable cam (2), a connecting rod (3) and the slide rod (4) and hence
converted into an oscillating movement - see . This drive principle ensures
an exact, enforced execution of the prestroke and reciprocal stroke, which
is particularly advantageous when overcoming large suction lifts or when
metering highly viscous media. The adjustment of the stroke length takes
place via a finely adjustable change to the eccentricity of the shift ring (TZ)
(5) which influences the oscillating stroke movement. This drive principle
ensures a harmonic, purely sinusoidal stroke movement for each stroke
length adjustment. The harmony of the power end is expressed acousti‐
cally in the minimum running noise.
The power ends of the version TZMb have a maximum stroke length of 10
mm and are designed for operation with mechanically deflected diaphragm
dosing heads. The power ends are also available for double-head TZMbD
metering pumps.
3
4
2
Fig. 6: Cross-section through the power end
1
Worm gear
2
Cam shaft
3
Connecting rod
4
Slide rod
5
Shift ring
The metering diaphragm (2) hermetically shuts off the pump volume of the
dosing head (3) from the outside. The suction valve (4) closes as soon as
the metering diaphragm (2) is moved in to the dosing head (3) and the
feed chemical flows through the discharge valve (1) out of the dosing
head. The discharge valve (1) closes as soon as the metering diaphragm
(2) is moved in the opposite direction due to the vacuum pressure in the
dosing head and fresh feed chemical flows through the suction valve (4)
into the dosing head. One cycle is thus completed.
Functional description
P_MA_0028_SW
5
1
17
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