PURPOSE: To reduce the discharge pulsation and reduce noises by discharging the fluid sucked from the center position of a fixed scroll section and pressurized by the tuning motion of a rotary scroll from the outer periphery of the fixed scroll.
CONSTITUTION: When a drive motor 25 is rotated and the rotation of a motor shaft 26 is transmitted to a crank shaft 15 via the magnetic coupling between a magnet 28 and a magnet 24, a rotary scroll 13 having a double-wound lap tooth profile starts rotating. The liquid sucked from a liquid suction pipe 30 provided at the center of a fixed scroll 12 is pressurized and moved to the outer periphery side of the fixed scroll 12 and discharged from a discharge pipe 31 by the pump action in cooperation with the fixed scroll 12 having the double-wound lap tooth profile. The discharge pressure of the rotary scroll 13 is applied to the back face of the rotary scroll 13 via back pressure passage holes 33, 34, and the tip of the rotary scroll 13 is prevented from being separated from the fixed scroll 12.
KOKUNI KENSAKU
SHIIBAYASHI MASAO
