초록

In a vane pump, a bottom surface of a suction side low pressure passage is set to be below a bottom surface of a return passage of a flow control valve in a cross portion between the return passage and the low pressure passage.

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In a vane pump, a bottom surface of a suction side low pressure passage is set to be below a bottom surface of a return passage of a flow control valve in a cross portion between the return passage and the low pressure passage. argement angle (n) of the scroll chamber (4a) is set at substantially 3.

In a vane pump, a bottom surface of a suction side low pressure passage is set to be below a bottom surface of a return passage of a flow control valve in a cross portion between the return passage and the low pressure passage. argement angle (n) of the scroll chamber (4a) is set at substantially 3.3 degrees. 6. The centrifugal multiblade blower as claimed in claim 5, wherein the scroll chamber (4a) is gradually uniformly enlarged in opposite axial directions of the motor shaft (3a) at the axial enlargement angle (α) of substantially 6 degrees from the tongue portion (4k) toward the discharge port (4c). 7. The centrifugal multiblade blower as claimed in claim 2, wherein: the first counter-flow prevention means (10) comprises: (i) a first fan rib (11) provided on the multiblade fan (2) so that the first fan rib (11) is protruded from the multiblade fan (2) to the first apert