FIELD: machine building.
SUBSTANCE: invention relates to a heating, ventilation and air conditioning system. Injection unit comprises housing with wall in form of "volute", motor with output shaft extending in housing, blade wheel located in housing and installed on output shaft, to create air flow along airflow path in housing, air flow outlet and scroll cut-off. Scroll cut-off may turn about its central or center axis and form, in fact, continuous surface with wall in form of "volute" and with release of air flow along air flow path in first position, and forms air gap. Injection unit also comprises actuator to turn cutoff from first position to second position, in which air gap is increased to reduce air flow.
EFFECT: simplified design and reduced turbulence, noise and vibration.
18 cl, 3 dwg
