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(11) | EP 3 012 461 A1 |
(12) | EUROPEAN PATENT APPLICATION |
published in accordance with Art. 153(4) EPC |
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(54) | CENTRIFUGAL COMPRESSOR |
(57) Provided is a centrifugal compressor in which a malfunction such as shaft vibration
due to rotating stall is suppressed, and degradation of performance due to friction
losses or the like is suppressed. In a centrifugal compressor (10) including a diffuser
section (15) for circulating fluid discharged from an impeller (13), a flow path width
W2 of the diffuser section (15) at an inflow position where the fluid flows in the
diffuser section (15) is narrower than a flow path width W1 of the impeller (13) at
a discharge position where the fluid is discharged from the impeller (13), and a flow
path width enlarged section (15c) wider than the flow path width W1 of diffuser section
(15) at the inflow position is provided on a downstream side with respect to the inflow
position of the diffuser section (15). |
{Technical Field}
{Background Art}
{Citation List}
{Patent Literature}
{PTL 1} Japanese Unexamined Patent Application, Publication No. 2003-120594
{PTL 2} Japanese Unexamined Patent Application, Publication No. 2010-144698
{Summary of Invention}
{Technical Problem}
{Solution to Problem}
{Advantageous Effects of Invention}
{Brief Description of Drawings}
[FIG. 1] FIG. 1 is a longitudinal sectional view of a centrifugal compressor of a first embodiment.
[FIG. 2] FIG. 2 is a front view of the centrifugal compressor of the first embodiment.
[FIG. 3] FIG. 3 is a longitudinal sectional view of a centrifugal compressor of a second embodiment.
[FIG. 4] FIG. 4 is a longitudinal sectional view of a centrifugal compressor of a third embodiment.
[FIG. 5] FIG. 5 is a longitudinal sectional view of a centrifugal compressor of a fourth embodiment.
[FIG. 6] FIG. 6 is a longitudinal sectional view of a centrifugal compressor of a fifth embodiment.
{Brief Description of Drawings}
First Embodiment
SECOND EMBODIMENT
THIRD EMBODIMENT
FOURTH EMBODIMENT
FIFTH EMBODIMENT
{Reference Signs List}
1: Hub
2: Shroud
3: Blade
10: Centrifugal compressor
11: Casing section
13: Impeller
15: Diffuser section
15a: Hub side wall
15b: Shroud side wall
15c: Flow path width enlarged section
16: Volute section
A: Axis
W1: Flow path width of impeller at discharge position
W2: Flow path width of diffuser section at inflow position
W3: Flow path width of diffuser section at flow path width
enlarged section
an impeller that is rotatable around an axis, and discharges fluid, which flows in an axial direction along the axis, in a direction inclined from the axial direction;
a casing section that houses the impeller; and
a diffuser section that circulates the fluid discharged from the impeller, wherein
the impeller includes a hub and a shroud that are arranged along the axial direction side by side, and a plurality of blades that are arranged between the hub and the shroud,
a flow path width of the diffuser section at an inflow position where the fluid flows in the diffuser section is narrower than a flow path width of the impeller at a discharge position where the fluid discharges from the impeller, and
a flow path width enlarged section wider than the flow path width of the diffuser section at the inflow position is provided on a downstream side with respect to the inflow position of the diffuser section.
REFERENCES CITED IN THE DESCRIPTION
Patent documents cited in the description