Figure 5-16.--Window wiper schematic.
during the cleaning process, prolonging its life as a
cleaning items with a mixture of dust, dirt, and grease,
such as vent filters.
useful cleaning agent.
Ultrasonic cleaners use high-frequency vibrations
Single-phase, 450-volt, ac power is filtered and fed
in an aqueous solution to agitate and "scrub" particles
into a 2 to 1 step-down transformer. In addition to the
from an item to be cleaned.
generator cabinet blower, the cleaning solution
circulating pump, and the heat exchanger, the secondary
The tank of some ultrasonic cleaners is divided into
voltage of 220 volts is used to control the operation of
two sections, allowing cleaning in one side and rinsing
a trigger circuit. The trigger causes pulses to be fed to
and drying in the other. Besides a tank for holding the
an SCR in both generator circuits. The pulses to the
cleaning solution and the part to be cleaned, the cleaner
SCRs cause the generators to develop a signal that is fed
may also be fitted with a spray gun consisting of a hose
to the transducers. A frequency adjusting control on the
and nozzle fitting to blast clean hard spots. The cleaning
trigger circuit permits adjusting the signal to the
solution can be heated using a 5-Kilowatt electric heater
for extra cleaning power. The cleaning solution is
generators approximately 1000 cycles on either side of
circulated through a filter to remove small impurities