Flow-through arrangement

Patent metadata

Field	Value
Publication number	US-11225977-B2
Application number	US-201816645090-A
Country	US
Kind code	B2
Filing date	Aug 20, 2018
Priority date	Sep 20, 2017
Publication date	Jan 18, 2022
Grant date	Jan 18, 2022

Abstract

An arrangement having an impeller that rotates about an axis and a stationary diffuser located downstream with guide vanes. The impeller has an inlet for an axial supply flow and an outlet for a radial out-flow, wherein radially and axially extending rotor blades are arranged between a wheel disc and a cover disc of the impeller. The impeller channels are separated from one another in a circumferential direction. The diffuser extends substantially radially along a main flow direction and has an axial channel width. The diffuser has a diffuser inlet and outlet, wherein guide vanes extending axially along a blade vertical direction and radially along a through-flow direction are arranged between the wheel disc side and the cover disc side of the diffuser, which separate the guide vane channels from one another. An inlet edge angle is smaller on the cover disc side than on the wheel disc side.

First claim

The invention claimed is:

1. An arrangement through which a process fluid is able to flow along a main flow direction, comprising:
an impeller which is rotatable about an axis in a direction of rotation, and an upright diffuser which is situated downstream of the impeller and is equipped with guide vanes,
wherein the impeller has an inlet for axial inflow and has an outlet for radial outflow,
wherein radially and axially extending rotor blades are arranged between a wheel disk and a cover disk of the impeller and delimit impeller channels with respect to one another in a circumferential direction,
wherein the diffuser extends radially along a main flow direction, wherein the diffuser has an axial cover disk side and an axial wheel disk side, which delimit between them an axial channel width of the diffuser,
wherein the diffuser has a diffuser inlet for a radial inflow and has a diffuser outlet,
wherein guide vanes extending axially along a vane height direction and radially along a throughflow direction are arranged between the wheel disk side and the cover disk side of the diffuser and delimit guide vane channels with respect to one another in a circumferential direction,
wherein a profile angle of curvature, an angle between a tangent to a mean line in an inlet edge region and a tangent to the mean line in an outlet edge region is smaller on the cover disk side than on the wheel disk side, wherein the profile angle of curvature is measured in the mathematically positive sense, proceeding from the tangent to the mean line in the inlet edge region, wherein the diffuser has a three-dimensional configuration such that, in a furthest upstream diffuser third, where the extent of the guide vanes is divided into three diffuser thirds along the main flow direction, an axial projection of a cover disk-side guide vane track and a wheel disk-side guide vane track has, from the cover disk-side guide vane track to the wheel disk-side guide vane track, a surface area 5% larger in relation to the cover disk-side guide vane track surface.

2. The arrangement as claimed in claim 1 , wherein the guide vanes are designed such that, for each axial vane height, an inlet edge angle is defined as the angle between an inlet edge tangent to a mean line at an inlet edge of the respective guide vane and a circumferential tangent through the inlet edge,
wherein the inlet edge angle is smaller on the cover disk side than on the wheel disk side, wherein the inlet edge angle is in this case the mathematically positively covered angle from the circumferential tangent to the inlet edge tangent.

3. The arrangement as claimed in claim 2 , wherein a magnitude of a difference between cover disk-side and wheel disk-side inlet edge angles is at least 5°.

4. The arrangement as claimed in claim 1 , wherein an angle of attack of the guide vanes is smaller on the cover disk side than on the wheel disk side, wherein, proceeding from the circumferential tangent, the angle of attack is a mathematically positively measured angle to the profile chord.

5. The arrangement as claimed in claim 4 , wherein a magnitude of a difference between cover disk-side and wheel disk-side angles of attack of the guide vanes is at least 5°.

6. The arrangement as claimed in claim 1 , wherein a quotient of axial channel width of the diffuser equipped with vanes and maximum impeller outlet diameter is greater than 0.04.

7. The arrangement as claimed in claim 1 , wherein a quotient of axial channel width of the diffuser equipped with vanes and axial channel width of the impeller at the maximum impeller outlet diameter is less than 0.95.

8. The arrangement as claimed in claim 1 , wherein the guide vanes are designed such that an inlet angle of attack is defined as a mathematically positive angle between a tangent to the mean line in the inlet edge region and a profile chord, and the inlet angle of attack is smaller on the cover disk side than on the wheel disk side.

9. The arrangement as claimed in claim 1 , wherein the guide vanes have an inclination such that, on the cover disk side, an inlet edge, in relation to a wheel disk-side inlet edge, is offset counter to the direction of rotation of the impeller by at least 10% of the axial channel width of the diffuser.

10. The arrangement as claimed in claim 1 , wherein the guide vanes are designed such that an offset counter to the direction of rotation of the impeller at an outlet edge from the cover disk side in relation to the wheel disk side is smaller than at an inlet edge.

11. The arrangement as claimed in claim 1 , wherein an axial profile of the guide vanes of the diffuser from the cover disk side to the wheel disk side is of continuously curved form.

Assignees

• Siemens Energy Global Gmbh & Co Kg

Inventors

• Martens Uwe
• Petry Nico

Classifications

• F04D29/444 Primary

  Bladed diffusers · CPC title