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Return stage of a multi-stage turbocompressor or turboexpander having rough wall surfaces

A turbo compressor and turbine technology, which is applied to machines/engines, components of pumping devices for elastic fluids, mechanical equipment, etc., can solve the problems of high processing costs and other problems, and achieve the effect of reducing pressure loss

Inactive Publication Date: 2017-08-18
SIEMENS AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This treatment method, which is also proposed in EP 1 433 960 B1, is associated with additional processing effort and leads to significantly more costs

Method used

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  • Return stage of a multi-stage turbocompressor or turboexpander having rough wall surfaces

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Experimental program
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Embodiment Construction

[0030] figure 1 A schematic longitudinal section through the return stage RS of the turbocompressor TCO from the first impeller IMP1 to the second impeller IMP2 is shown.

[0031] The two impellers IMP1 , IMP2 are integral parts of the rotor R, wherein the impellers IMP1 , IMP2 are mounted on a shaft SH extending along the axis X in a non-positive manner. The rotor R is surrounded by flow-guiding, stationary components, of which the return stage RS is shown here. A multi-stage turbine generally comprises a plurality of return stages RS, viewed in the flow direction from the first impeller IMP1, which turn the process fluid PF by 180° immediately after the radial diffuser section and towards the radially inward back-directed and then diverted in the axial direction in order to feed the process fluid PF to the second downstream impeller IMP2, which in the case of the turbocompressor TCO draws the process fluid PF axially and radially output it.

[0032] The return stage gener...

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Abstract

The invention relates to a return stage (RS) of a radial turbohydrodynamic machine, in particular a radial turbocompressor (TCO), having an axis of rotation (X), the return stage (RS ) comprises an annular flow channel (CH) for conveying the flowing process fluid (PF) from the flow opening of the first impeller (IMP1) to the flow opening of the second impeller (IMP2) arranged downstream. In order to increase efficiency it is proposed that the flow channel (CH) is delimited by bounding surface areas (SFA), of which at least one specific roughened area extending in the circumferential direction has an increased relative to the other areas Surface Roughness (RZ).

Description

Background technique [0001] In radial turbo fluid energy machines, in particular radial turbo compressors, the process fluid is drawn axially from the impeller or impeller and output radially accelerated. In a multi-stage configuration, a so-called return stage is used to convey the process fluid output from the impeller upstream to another working wheel further downstream. In this case, the return stage not only has the function of diverting the process fluid radially outwards from the flow direction into the axial flow direction and feeding it to the other rotor, but also at least partially decelerating the flow of the process fluid and in this way The way increases the pressure according to Bernoulli's principle. In this case, when the process fluid is fed to the other rotor, the return stage is usually formed simultaneously as a diffuser in the radially outwardly oriented flow path and as a nozzle in the radially inwardly oriented flow path. The return stage is stationar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04D17/12F04D29/44F04D29/68
CPCF04D29/681F01D9/045F04D17/122F04D29/444F05D2220/40F05D2250/63F05D2300/516
Inventor 斯文·柯尼希
Owner SIEMENS AG