Furthermore, the injection port should be located as closely
as possible to the scroll wrap of the fixed scroll. A detailed
analysis can find that the injection port located in the first
compression pocket (Fig. 12) will lead to an injection to the
suction pocket, which will largely decrease the system
performance. The only possible location of the injection port
to avoid injection into the suction chamber is between injection
port A and injection port B (possible location of injection
port in Fig. 12). But the injection ports between injection port A
and injection port B, for example the injection port C, will
inject refrigerant into two symmetric compression pockets
sequentially, which will lead to unbalanced injection. Therefore,
the injection port positions must be close to the wrap of
the static scroll, such as ports A and B shown in Fig. 12.