JP2013204550A5

JP2013204550A5 -

Info

Publication number: JP2013204550A5
Application number: JP2012076293A
Authority: JP
Filing date: 2012-03-29
Publication date: 2015-04-09
Anticipated expiration: 2032-03-29

Description

上記目的を達成するため、本発明は、以下の手段を採用する。
本発明に係る遠心圧縮機は、軸線周りに回転可能であり、該軸線に沿った軸線方向に沿って流入する流体を該軸線方向から傾斜した方向に吐出する羽根車と、該羽根車を収容するケーシング部と、前記羽根車から吐出した前記流体を流通させるディフューザ流路を形成するディフューザ部と、を備え、前記羽根車が、前記軸線方向に沿って並ぶハブおよびシュラウドと、該ハブおよび該シュラウドの間に配置されるとともに前記ハブの内壁と前記シュラウドの内壁とにより画定される空間を仕切って複数の吐出流路を形成する複数のブレードを有し、前記ディフューザ部に前記流体が流入する流入位置における該ディフューザ部の流路幅が、前記羽根車から前記流体が吐出する吐出位置における前記羽根車の流路幅よりも狭く、前記流入位置における前記ディフューザ部のハブ側壁を前記吐出位置における前記ハブの内壁の前記ディフューザ部に向かう延長線よりも前記ディフューザ流路の中心側に配置し、前記流入位置における前記ディフューザ部のシュラウド側壁を前記吐出位置における前記シュラウドの内壁の前記ディフューザ部に向かう延長線よりも前記ディフューザ流路の中心側に配置し、前記ディフューザ部の前記流入位置よりも下流側には、該流入位置における前記ディフューザ部の流路幅よりも広い流路幅拡大部が設けられていることを特徴とする。 In order to achieve the above object, the present invention employs the following means.
A centrifugal compressor according to the present invention is capable of rotating around an axis, and includes an impeller that discharges fluid flowing in an axial direction along the axis in a direction inclined from the axial direction, and the impeller And a diffuser part that forms a diffuser flow path through which the fluid discharged from the impeller is circulated, the hub and shroud arranged along the axial direction, the hub and the hub a plurality of blades partitions the space defined that form a plurality of discharge flow path by the inner wall and the inner wall of said shroud is disposed between the shroud Rutotomoni said hub, said fluid flows into the diffuser portion channel width of the diffuser section in the inflow position is narrower than the channel width of the impeller at the discharge position where the fluid is discharged from said impeller, said inlet position A hub side wall of the diffuser part in the discharge position is arranged closer to a center side of the diffuser flow path than an extension line of the inner wall of the hub at the discharge position toward the diffuser part, and a shroud side wall of the diffuser part at the inflow position is The inner wall of the shroud at the position is arranged on the center side of the diffuser flow path from the extension line toward the diffuser part, and the flow of the diffuser part at the inflow position is downstream of the inflow position of the diffuser part. The present invention is characterized in that a channel width expanding portion wider than the channel width is provided.

本発明に係る遠心圧縮機によれば、軸線方向に沿って流入する流体を軸線方向から傾斜した方向に吐出する羽根車と、羽根車を収容するケーシング部と、羽根車から吐出した流体を流通させるディフューザ流路を形成するディフューザ部と、を備え、羽根車が、軸線方向に沿って並ぶハブおよびシュラウドと、ハブおよびシュラウドの間に配置されるとともに前記ハブの内壁と前記シュラウドの内壁とにより画定される空間を仕切って複数の吐出流路を形成する複数のブレードを有する。 According to the centrifugal compressor of the present invention, the impeller that discharges the fluid flowing in along the axial direction in a direction inclined from the axial direction, the casing portion that houses the impeller, and the fluid discharged from the impeller are circulated. It includes a diffuser portion forming a diffuser flow path which causes the impeller has a hub and shroud arranged along the axial direction by the inner wall and the inner wall of the shroud of Rutotomoni said hub is disposed between the hub and the shroud partitions the space defined having a plurality of blades that form a plurality of discharge flow paths.

本発明の第１態様の遠心圧縮機は、前記流路幅拡大部における前記ハブ側壁が、前記流入位置における前記ハブ側壁よりも前記ディフューザ部の流路幅を拡大する方向に配置されており、前記流路幅拡大部における前記シュラウド側壁が、前記流入位置における前記シュラウド側壁よりも前記ディフューザ部の流路幅を拡大する方向に配置されていることを特徴とする。 Centrifugal compressor of the first aspect of the present invention, the hub side wall before SL channel width expansion section, being arranged in a direction to enlarge the channel width of the diffuser portion than the hub side wall at said inlet position The shroud side wall in the flow path width expanding portion is arranged in a direction in which the flow path width of the diffuser portion is larger than the shroud side wall in the inflow position.

本発明の第２態様の遠心圧縮機は、前記流路幅拡大部における前記ハブ側壁が、前記流入位置における前記ハブ側壁よりも前記ディフューザ部の流路幅を拡大する方向に配置されていることを特徴とする。 Centrifugal compressor of the second aspect of the present invention, the hub side wall before SL channel width expansion section is arranged in a direction to enlarge the channel width of the diffuser portion than the hub side wall at said inlet position It is characterized by that.

本発明の第３態様の遠心圧縮機は、前記流路幅拡大部における前記シュラウド側壁が、前記流入位置における前記シュラウド側壁よりも前記ディフューザ部の流路幅を拡大する方向に配置されていることを特徴とする。 Centrifugal compressor of the third aspect of the present invention, the shroud-side wall before SL channel width expansion section is arranged in a direction to enlarge the channel width of the diffuser than said shroud side wall at said inlet position It is characterized by that.

Claims

An impeller that is rotatable about an axis and discharges fluid flowing in the axial direction along the axis in a direction inclined from the axial direction;
A casing portion for housing the impeller;
A diffuser section that forms a diffuser flow path for circulating the fluid discharged from the impeller, and
The impeller comprises a hub and a shroud arranged along the axial direction, a plurality of discharge partitions the space defined by the said hub and the inner wall and the inner wall of said shroud disposed Rutotomoni the hub between the shroud a plurality of blades that form a flow path,
The flow passage width of the diffuser portion at the inflow position where the fluid flows into the diffuser portion is narrower than the flow passage width of the impeller at the discharge position where the fluid is discharged from the impeller,
The diffuser portion is defined by a hub side wall provided on the hub side and a shroud side wall provided on the shroud side;
The hub side wall of the diffuser portion at the inflow position is disposed closer to the center of the diffuser flow path than the extension line toward the diffuser portion of the inner wall of the hub at the discharge position,
The shroud side wall of the diffuser portion at the inflow position is disposed closer to the center of the diffuser flow path than the extension line toward the diffuser portion of the inner wall of the shroud at the discharge position,
A centrifugal compressor characterized in that, on the downstream side of the inflow position of the diffuser part, a flow path width expanding part wider than the flow path width of the diffuser part at the inflow position is provided.

Said hub sidewall before SL channel width expansion section, being arranged in a direction to enlarge the channel width of the diffuser portion than the hub side wall at said inlet position,
2. The centrifugal compression according to claim 1, wherein the shroud side wall in the flow path width enlarged portion is arranged in a direction in which the flow path width of the diffuser portion is larger than the shroud side wall at the inflow position. Machine.

Centrifuge of claim 1, wherein the hub side wall before SL channel width expansion section, characterized in that it is arranged in a direction to enlarge the channel width of the diffuser portion than the hub side wall at said inlet position Compressor.

Centrifuge of claim 1, wherein the shroud side wall before SL channel width expansion section, characterized in that it is arranged in a direction to enlarge the channel width of the diffuser than said shroud side wall at said inlet position Compressor.

The shape of the hub side wall is a tapered shape in which the flow path width gradually increases along the flow direction of the fluid at an intermediate position between the inflow position of the diffuser part and the flow path width expansion part,
3. The centrifugal compressor according to claim 2, wherein the shroud side wall has a tapered shape in which a flow path width gradually increases along a flow direction of the fluid at the intermediate position of the diffuser portion.

The shape of the hub side wall is a tapered shape in which the channel width gradually increases along the fluid flow direction at an intermediate position between the inflow position of the diffuser portion and the channel width expanding portion. The centrifugal compressor according to claim 3.

The shape of the shroud side wall is a tapered shape in which the flow passage width gradually increases along the fluid flow direction at an intermediate position between the inflow position of the diffuser portion and the flow passage width enlargement portion. The centrifugal compressor according to claim 4.

The shape of the hub side wall is a step shape in which the flow path width is gradually increased along the flow direction of the fluid at an intermediate position between the inflow position of the diffuser part and the flow path width expansion part,
The centrifugal compressor according to claim 2, wherein the shape of the shroud side wall is a step shape in which the flow path width is gradually increased along the flow direction of the fluid at the intermediate position of the diffuser portion. .

The shape of the hub side wall is a step shape in which the channel width gradually increases along the fluid flow direction at an intermediate position between the inflow position of the diffuser portion and the channel width expanding portion. The centrifugal compressor according to claim 3, wherein

The shape of the side wall of the shroud is a step shape in which the flow path width gradually increases along the flow direction of the fluid at an intermediate position between the inflow position of the diffuser section and the flow path width expansion section. The centrifugal compressor according to claim 4, characterized in that:

The ratio of the flow path width of the diffuser portion at the inflow position to the flow path width of the impeller at the discharge position is 0.5 or more and less than 0.8. Item 11. The centrifugal compressor according to any one of Items 10.

The ratio of the flow path width of the diffuser part in the flow path width enlarged part to the flow path width of the impeller at the discharge position is 0.8 or more and 1.0 or less. The centrifugal compressor according to any one of claims 1 to 11.

The centrifugal compressor according to any one of claims 1 to 12, wherein the impeller discharges the fluid flowing in along the axial direction in a direction orthogonal to the axial direction.

The flow rate coefficient is 0.01 or more and 0.05 or less, The centrifugal compressor given in any 1 paragraph of Claims 1-13 characterized by things.