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A kind of supercritical steam turbine pre-twisted guide vane assembly method

An assembly method and guide vane technology, which is applied in the field of supercritical steam turbine pre-twisted guide vane assembly, can solve problems such as shroud shroud and blade deformation, shroud and rivet head stress concentration, and hidden dangers in the safe operation of condensing steam turbines.

Active Publication Date: 2017-10-24
HARBIN TURBINE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that the shroud and the rivet head are prone to stress concentration when riveting shroud blades at present, so that the welded shroud is prone to deformation of the shroud and the blade, which brings serious problems to the safe operation of the condensing steam turbine. To eliminate the hidden dangers, and then provide a supercritical steam turbine pre-twisted guide vane assembly method

Method used

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  • A kind of supercritical steam turbine pre-twisted guide vane assembly method
  • A kind of supercritical steam turbine pre-twisted guide vane assembly method
  • A kind of supercritical steam turbine pre-twisted guide vane assembly method

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specific Embodiment approach 1

[0028] Specific embodiment one: combine 1 to Figure 9 Describe this embodiment, a kind of supercritical steam turbine pre-twisted guide vane assembly method of this embodiment, it comprises the following steps:

[0029] Step 1: Install the stator baffle cover 1 and the body seal 2;

[0030] Put the stator diaphragm sleeve 1 flat on the cushion box, with the horizontal center facing upwards, install the body seal 2 into the stator diaphragm sleeve 1 in the order from bottom to top, and at the same time install the body seal 2 Insert the locking piece 3 on one side;

[0031] Step 2: Machining body seal piece 2;

[0032] Turning the body seal 2 that has been installed on the stator diaphragm sleeve 1;

[0033] Step 3: Clean the stator partition cover 1 and the body seal 2 after the car processing;

[0034] Lay the steam outlet side of the stator baffle set 1 upwards, clean the baffle slots, pre-twisted guide vanes and other parts of the stator baffle set 1 at all levels, deb...

specific Embodiment approach 2

[0047] Specific implementation mode two: combination figure 1 Describe this embodiment, the main body steam seal 2 and the locking plate 3 installed in the leveling step 1 of this embodiment, so that the body steam seal 2 and the locking plate 3 are on the same plane as the horizontal mid-section of the partition cover 1 superior. Other compositions and connections are the same as in the first embodiment.

[0048] The structural design of the pre-twisted guide vane has the following characteristics: the outline of the intermediate body of the blade root and the shroud is a parallelogram, and the pitch of the shroud and the blade root is corrected in the design, so that the actual pitch of the blade shroud is higher than the theoretical one. Increase the pitch by a certain amount. The pre-twisted installation first twists the blade shroud relative to the blade root by an angle, and when the shrouds are separated from each other under the action of centrifugal force and therm...

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Abstract

The invention discloses a pre-twisting type guide vane assembly method for a supercritical steam turbine, and relates to a guide vane assembly method which aims to solve the problem that hidden danger is caused to safe operation of a gas-condensing type steam turbine due to the fact that a welded girdle easily generates a girdle vane deformation phenomenon as a result of a stress concentration phenomenon easily generated by the girdle and rivet heads when the girdle vane is riveted at present. The pre-twisting type guide vane assembly method comprises the following steps: step I, mounting a stator diaphragm carrier ring and a body steam-sealing sheet; step II, turning the body steam-sealing sheet; step III, clearing the turned stator diaphragm carrier ring and the body steam-sealing sheet; step IV: marking out and fitting pre-twisting type guide vanes in a trial mode; step V: normally fitting and fixing the first pre-twisting type guide vane; step VI: normally fitting other pre-twisting type guide vanes and fixing, and reserving wheel slots of to-be-fitted pre-twisting type guide vanes; step VII: fitting the reserved pre-twisting type guide vanes; and step VIII: checking whether the dimensions of the fitted pre-twisting type guide vanes are qualified or not. The pre-twisting type guide vane assembly method is used for fitting the pre-twisting type guide vanes.

Description

technical field [0001] The invention relates to a guide vane assembly method, in particular to a supercritical steam turbine pre-twisted guide vane assembly method. Background technique [0002] The Suizhong reformed unit is a single-shaft five-cylinder unit with an intermediate reheating and impulse condensing steam turbine. The guide vane design of the flow part of the unit widely adopts the structural type of the integral shroud of the pre-twisted T-shaped blade root. This structural type of guide vane design puts forward new technological requirements for the assembly of the blade. The new requirement is: currently, when riveting shroud blades, since the shroud and the rivet head are prone to stress concentration, the welded shroud is prone to deformation of the shroud and the blade, which brings serious problems to the safe operation of the condensing steam turbine. Hidden danger. Contents of the invention [0003] The purpose of the present invention is to solve th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23P15/00B23P21/00F01D9/02
CPCB23P15/006B23P21/00F01D9/02F05D2230/60
Inventor 李大俭于克杜英杰陈佩娟张扬刘俊峰付婷婷张广东赵瑜李逍晗
Owner HARBIN TURBINE
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