There are two kinds of ejectors used
in vacuum blowdown system: atmospheric ejector and water ejector (jet pump).
Mobile vacuum toilet usually uses the high-pressure air supply provided
by vehicles to produce vacuum through atmospheric ejector, which can reach
-0.04mpa ~ -0.05mpa. It has the advantages of simple structure, no moving parts,
low price and high reliability; the disadvantage is that the working efficiency
is not high. It should be noted that in order to avoid affecting the normal
braking of the vehicle when using the atmospheric injector, it is necessary to
strictly calculate the air consumption of the atmospheric injector, and increase
the air storage tank if necessary. However, it is relatively convenient when the
air source of trains and ships is abundant.
The water ejector is mostly
located in the vacuum tank or outdoor water collection unit, which takes the
gas-liquid mixture collected in the vacuum pipeline as the injection fluid, and
the working fluid is the circulating sewage driven by the water pump. This
method has been widely used in early design, but it is rarely used at present.
At the same time, the water ejector design can also be used in the vacuum toilet
system of mobile vehicles.
Water Ring Vacuum Pump
Dry
Scroll Vacuum Pump
industrial vacuum pumps,vacuum furnaces
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