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Rotor blade for a thermal rotary machine and method for producing such a rotor blade

A technology for rotor blades and rotating machines, applied in the direction of supporting elements of blades, machines/engines, mechanical equipment, etc., can solve problems such as expensive inspection or maintenance work, consumption, power limitations of rotating machines, etc., to achieve stress resistance, Effect of high wall thickness characteristics and centrifugal stress reduction

Pending Publication Date: 2021-10-19
西门子能源全球有限两合公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Due to the existing strength limitations of today's materials, rotor blades can therefore only be constructed in certain dimensions at a predetermined rotational speed
Consequently, the swept area A is limited, whereby the mass flow or volume flow that can pass through the blade ring is also limited
This means that the power of the rotating machine is limited due to the practicable blade size for each surge
[0006] In addition to this power limitation, the high LCF stresses of the rotor blades cited today due to centrifugal forces are generally the limit for the permissible number of load changes of the component
When the permissible number of load changes is reached, complex and costly inspection or repair work or replacement of the rotor blades or rotor is then required

Method used

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  • Rotor blade for a thermal rotary machine and method for producing such a rotor blade
  • Rotor blade for a thermal rotary machine and method for producing such a rotor blade
  • Rotor blade for a thermal rotary machine and method for producing such a rotor blade

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Embodiment Construction

[0033] figure 1A rotor blade 1 according to the prior art is shown. The rotor blade is here produced in one piece, for example from a forging or a semi-finished product. The rotor blade 1 comprises an airfoil region 3 formed in the form of a flow profile 2 and a root region 4 formed for fastening the rotor blade 1 to the rotor. Due to the solid, one-piece construction of the rotor blade 1 , high centrifugal stresses act during operation of the hot rotating machine. Particularly at large blade lengths and / or high rotational speeds, rotor blades can only be produced from high-strength and thus expensive materials or eventually no longer can be produced at all. The most stressed regions of the rotor blade 1 are here the blade root region 4 and the transition into the airfoil region 3 . The airfoil region 3 itself is also subjected to high stresses in the wide part of its extension. The stress on the blade root and airfoil acts as a combination of LCF and HCF stresses generate...

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PUM

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Abstract

The invention relates to a rotor blade (1) for a thermal rotary machine, said rotor blade comprising: at least one blade region (3) forming an airfoil (2); and a blade root region (4) designed to fasten the rotor blade (1) to a rotor. The rotor blade (1) is assembled from at least two prefabricated components (5, 6, 7) and has at least one cavity (8) which is delimited by inner surfaces (9) of at least two components (5, 6, 7) of the rotor blade (1). The invention also relates to a method for manufacturing such a rotor blade (1).

Description

technical field [0001] The invention relates to a rotor blade for a thermally rotating machine according to the preamble of independent claim 1 and a method for manufacturing a rotor blade according to the preamble of independent claim 7 . Background technique [0002] Rotor blades for thermally rotating machines such as steam turbines or gas turbines are often subjected to high centrifugal forces in addition to high thermal stresses and are designed accordingly. Particularly at large blade lengths and / or high rotational speeds, rotor blades can only be produced from high-strength materials or eventually are no longer possible at all. Blades of different rotational speeds can pass through the magnitude A·n 2 Comparing with each other, where A is the swept area, and n is the rotational speed. [0003] Currently, rotor blades are generally produced in one piece, for example from forgings or semi-finished products. The rotor blades here have blade roots, through which the ro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01D5/14F01D5/18F01D5/30
CPCF01D5/147F01D5/18F05D2230/232F05D2260/94F05D2240/30B23P15/04
Inventor 德特勒夫·哈耶
Owner 西门子能源全球有限两合公司
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