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Impeller top surrounding band and turbine

A technology of turbines and top enclosures, applied in mechanical equipment, engine components, machines/engines, etc., can solve problems such as complex sealing forms, reduce gas bearing effects, reduce spiral flow effects, and reduce excitation force. Effect

Inactive Publication Date: 2015-08-19
UNIV OF SHANGHAI FOR SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The general trend is: the number of sealing teeth is increasing, and the sealing form is becoming more and more complex

Method used

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  • Impeller top surrounding band and turbine
  • Impeller top surrounding band and turbine

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Embodiment Construction

[0018] The present invention will be further described below in conjunction with the embodiments and accompanying drawings. Those skilled in the art should understand that the embodiments and accompanying drawings are only for better understanding of the present invention, and are not used to make any limitation. see figure 1 , the turbine according to the present invention includes a cylinder (not shown in the figure) and an impeller (not shown in the figure) arranged in the cylinder and capable of rotating relative to the cylinder, and the tip shroud 2 is arranged around the tip of the impeller. The blade tip shroud 2 and the impeller can be separate parts, and the two are fixed together by welding or other means. A supporting shell 1 is fixedly arranged on the inner surface of the cylinder, and a tip gap is formed between the supporting shell 1 and the tip shroud 2 , and a part of the total airflow flowing through the impeller will flow through the tip gap. A row of cascad...

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Abstract

The invention discloses an impeller top surrounding band and a turbine. The turbine comprises an air cylinder and an impeller which is arranged in the air cylinder and can rotate relative to the air cylinder. The impeller top surrounding band is arranged around the top end of the impeller and comprises a plurality of blade grids, wherein the blade grids are evenly arranged at intervals along the outer circumference face in the circumferential direction. The multiple blade grids are multiple protrusions on the outer circumference face of the impeller top surrounding band. By means of the impeller top surrounding band and the turbine, the energy of leaked fluid can be effectively used, the exciting force of the fluid can be restrained, and the stage internal efficiency can be improved.

Description

technical field [0001] The present invention relates generally to turbomachinery, and more particularly to a tip shroud for a turbine wheel. Background technique [0002] At present, it is generally accepted at home and abroad that fluid excitation at the blade tip of turbomachinery is one of the key factors affecting the safe, stable and reliable operation of the unit. With the development of units towards large capacity and high parameters and the continuous improvement of modern society's requirements for energy saving and emission reduction of large equipment, it is becoming more and more important to suppress fluid excitation at the blade tip of turbomachinery. [0003] At present, the main measures to suppress the fluid excitation of the tip of the blade at home and abroad include four aspects: (1) Improved design of the shape of the tip of the blade. For blades with shrouds, change the shape of the outer surface of the shrouds from smooth to non-smooth, such as openi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01D5/14
Inventor 张万福
Owner UNIV OF SHANGHAI FOR SCI & TECH
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