4
Section II – Description
A. General 3.
The single intra-vane pump with a 282/283 suffix is designed
to operate at reduced noise levels, but still maintain the
same reliability, operating characteristics, and service
advantages of previous models.
All sound reduction in the 282/283 series pump is
accomplished within the cartridge kit. The ring, vanes, rotor
and support plates have been redesigned. The pump
housing remains unchanged. Thus, existing systems may be
upgraded by simply replacing the cartridge kit. Figure 1
shows the basic 282/283 cartridge kit. Note that 12 vanes
are assembled into the machined rotor slots. Previous
designed models use 10 vanes.
Figure 1. -282/-283 Basic Cartridge Kit Parts
Section III – Principles of Operation 4.
A. General
The operating principle of a vane pump is illustrated in
Figure 2. A slotted rotor is splined to the drive shaft and
turns inside a cam ring. Vanes are fitted to the rotor slots and
follow the inner surface of the cam ring as the rotor turns.
Centrifugal force and pressure under the vanes hold them
out against the cam ring. Pumping chambers are formed
between the vanes and the cam ring and are enclosed by
the two support plates.
The 282/283 series pumps are of a balanced intra-vane
design (see Figure 2.). Outlet pressure is constantly applied
to the small intra-vane area of the vane. As the pump vane
rotates through the high and low quadrants, outlet pressure
is alternately applied to the rest of the under vane area. This
varying pressure under the vane reduces wear and
increases pump efficiency.
Pump delivery can be changed by changing the ring or
installing a new cartridge kit. Table 2 shows available
delivery options. Cartridge kit part numbers are tabulated in
the parts and service drawings (see Table 1.).
Figure 2. Vane Pump Operation
Outlet
Low
Pressure
Quadrant
High
Pressure
Quadrant
System
Pressure
Rotation
Inlet
Rotation
Inlet or
Outlet
Pressure
Continuous
Outlet
Pressure
Outlet support plate
feeds full load
pressure to
intra-vane area at
all times.
Holes in rotor segments
feed load pressure under
full vane area in pressure
quadrant and inlet pressure
under vane area in inlet
quadrants.
