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water turbine blade

A water turbine and blade technology, applied in the field of axial flow turbines, can solve problems such as laborious, falling, unreliable, etc.

Active Publication Date: 2017-04-26
VOITH PATENT GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But this caused other problems: fixing the packing in the groove was laborious and unreliable
It should be noted that there is a risk that, in particular in the release zone of the packing with the smallest layer thickness, the whole or part of the packing falls out of the groove during operation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0021] figure 1 The Kaplan turbine shown in includes an impeller 1 driven by a shaft 2 . The axis 2 is arranged vertically. The impeller comprises adjustable blades 1.1.

[0022] The impeller is surrounded by a flow-carrying wall 3 . In addition, a guide vane shroud 4 is also provided. It is installed in wall 3 . The guide vanes 4.1 are also adjustable.

[0023] The adjustment is carried out by the adjustment unit according to the invention, which adjustment makes it possible to apply an adjustment force proportional to the drop height.

[0024] figure 2 A conventional blade 1.1 of a Kaplan turbine with a blade root 1.2 is shown. The blade 1.1 comprises two unloading grooves 5 in the root region. The unloading tank has not been filled with filler.

[0025] image 3 A known form of embodiment with a rotor blade 1.1, a rotor blade root 1.2 and a filler material 6 is shown. The filler 6 is bonded to the bottom of the relief groove 5 by means of an epoxy layer 7 and th...

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PUM

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Abstract

The invention relates to a blade (1.1) of a water turbine comprising the following features or components: a main body made of steel plate or cast steel, said main body having mutually opposite outer surfaces in contact with water in operation; at least one sheath A charge trough (5) located in the peripheral region of the blade (1.1) and extending across mutually opposite regions of said outer surface; a solidified filler (6) for filling the cavity of the trough (5). The invention is characterized in that a holding body (10) is fixed to the groove surface (5.1), said holding body (10) being embedded in said filler (6) in the installed state; said holding body (10) has A protrusion which prevents the filler (6) from falling by a tight fit once said filler has cured.

Description

technical field [0001] The present invention relates to water turbines, in particular to axial flow turbines such as Kaplan turbines. See, for example, DE 10100963 AI. Background technique [0002] This type of water turbine includes, as basic components, an impeller, a guide wheel, and a casing. The impeller includes a shaft and a plurality of blades, which are driven to rotate by the shaft. The blades are generally adjustable about an axis of rotation perpendicular to the longitudinal axis of the shaft. [0003] The purpose of adjusting the blades is to optimize the degree of efficiency of the turbine and indeed over the entire working area. Furthermore, cavitation can be reduced or avoided based on the adjustment. [0004] Dimples often cause serious problems. It occurs where the static pressure of the fluid decreases as the fluid velocity increases. This is the case, for example, in the root region of the blade, where so-called groove stresses occur. [0005] To a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F03B3/12
CPCF03B3/121F05B2220/32F05B2240/30F05B2280/6015Y02E10/20
Inventor 英格丽·雷京特·霍恩
Owner VOITH PATENT GMBH