Figure 23 - Compression Process - Daikin EWYD-BZ Series Installation, Maintenance & Operation Manual

Figure 23 - Compression process

1. and 2. Suction
Main rotor flutes 'a', 'b' and 'c' are in
communication at one end with the suction
chamber via the bevelled rotor end face,
and are sealed at the other end by the star
rotor teeth. As the main rotor turns, the
effective length of the flutes increases with
a corresponding increase in the volume
open to the suction chamber: Diagram 1
clearly shows this process. As flute 'a'
assumes the position of flutes 'b' and 'c' its
volume increases, inducing suction vapour
to enter the flute.
Upon further rotation of the main rotor , the
flutes which have been open to the suction
chamber engage with the star teeth. This
coincides with
progressively sealed by the main rotor.
Once the flute volume is closed off from the
suction chamber, the suction stage of the
compression cycle is complete.
A Suction gas
3. Compression
As the main rotor turns, the volume of gas
trapped within the flute is reduced as the
length of the
compression occurs.
4. Discharge
As the star rotor tooth approaches the end
of a flute, the pressure of the trapped
vapour reaches
occurring when the leading edge of the
flute begins to overlap the triangular
shaped discharge port.
Compression immediately ceases as the
gas is delivered
manifold. The star rotor tooth continues to
scavenge the flute until the flute volume is
reduced to zero. This compression process
is repeated for each flute/star tooth in turn.
A Discharge gas
D-EIMHP00508-16EN - 40/64
each flute being
flute shortens and
a maximum value
into the discharge
c
b
a
c
c
b b
a
a
c
b
a
c
b
a
A
b
a
b
a
Oil separator not shown
1.
2.
3.
4.
A