Centrifugal compressor
Abstract
A circulation flow path of a centrifugal compressor includes a downstream slit, an upstream slit, and an intermediate flow path connecting the downstream slit to the upstream slit. An outer peripheral surface of the intermediate flow path is inclined radially outward as it moves from the downstream slit toward the upstream slit at least in a part continuous with the downstream slit. An inner peripheral surface of the intermediate flow path is inclined radially inward as it moves from the downstream slit toward the upstream slit at least in a part continuous with the downstream slit. An angle of the inner circumferential surface with respect to a straight line passing through the intermediate flow path and parallel to a central axis is greater than an angle of the outer circumferential surface with respect to the straight line.
Claims
exact text as granted — not AI-modifiedWhat is claimed is:
1 . A centrifugal compressor comprising:
a compressor impeller; and a compressor housing that accommodates the compressor impeller, the compressor housing including:
a main flow path that accommodates the compressor impeller; and
a circulation flow path that is positioned outside the main flow path in a radial direction of the compressor impeller and that is connected to the main flow path, the circulation flow path including:
a downstream slit that is connected to the main flow path at a position facing the compressor impeller in the radial direction;
an upstream slit that is connected to the main flow path at a position upstream of the downstream slit in the main flow path; and
an intermediate flow path that extends along an axial direction of the compressor impeller and that connects the downstream slit to the upstream slit,
the intermediate flow path being expanded as the intermediate flow path moves from the downstream slit toward the upstream slit at least in a part continuous with the downstream slit, an outer peripheral surface of the intermediate flow path being inclined radially outward as the outer peripheral surface moves from the downstream slit toward the upstream slit at least in a part continuous with the downstream slit, and an inner peripheral surface of the intermediate flow path being inclined radially inward as the inner peripheral surface moves from the downstream slit toward the upstream slit at least in a part continuous with the downstream slit, an angle of the inner peripheral surface with respect to a straight line passing through the intermediate flow path and parallel to a central axis of the compressor impeller is greater than an angle of the outer peripheral surface with respect to the straight line.
2 . The centrifugal compressor according to claim 1 , wherein a spread angle 2 θ expressed by the following Equation (3) is greater than 20°.
D
us
=
2
A
us
/
π
(
1
)
D
ds
=
2
A
ds
/
π
(
2
)
2
θ
=
2
tan
-
1
{
(
D
u
s
-
D
ds
)
/
2
L
}
(
3
)
where:
A ds : cross-sectional area of the intermediate flow path at a first end connected to the downstream slit
A us : cross-sectional area of the intermediate flow path at a second end connected to the upstream slit
D ds : equivalent diameter of the intermediate flow path at the first end
D us : equivalent diameter of the intermediate flow path the second end
L: distance between the first end and the second end in the axial direction.
3 . The centrifugal compressor according to claim 2 , wherein the spread angle 2 θ is greater than 30°.Join the waitlist — get patent alerts
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