SU1434241A1 - Method of checking turbine vane profile - Google Patents

Abstract

The invention allows the non-contact method to determine the twist angle of the blades of a gas turbine engine. The aim of the invention is to control not only the profile of the turbine blades, but also the angle of their twist. Initially, the reference blade is placed in the turning angle device, the shadow images of different sections on screen 2 are successively formed from it, noting their minimum dimensions on it, with which the edges of the image of the respective profiles of the controlled blade are subsequently combined by turning it with the help of a turning device 3, on the limb 4 of which the twist angle of the controlled section is taken. 1 il. with $ (L

Description

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The invention relates to a measurement technique and can be used in determining geometrical parameters of gas turbine blades, engines.

The purpose of the invention is to control not only the profile of turbine blades 5 "о and the angle of their twist,: The drawing shows the principle of |

The diagram shows a slit source 1 of light, a screen 2. Located parallel to the source and a rotary goniometer 3 with a limb 4, as well as a controlled blade 5 - Measurements are carried out as follows.

 Pre-position the reference | nuto blade 5 on the rotary protractor - device 1 3 so that the axis of the paddle lock is located parallel to the screen 2 and the slit light source 1, then project the image of the source on the screen on which the shadow pattern is monitored blades that overlap a part of the light beam from the IT ™ | to the point Turn the blade to those inop, while the linear dimensions of the shadow

| Image projections controlled by iMoro sections will not have a minimum size. On the screen, mark the image edges of the controlled section

I Move the slit source in parallel to oneself sequentially forming images on the screen of different sections of the blade; each time to achieve their minimum sizes by rotating the blade. The linear dimensions of the minimum images of each section are marked with meters and at the same time the limb 4 of the swiveling angle gauge removes the counting angle of twist of the reference blade. The zonalon blade is replaced with a controlled blade, the image of its various sections on the screen is sequentially formed. Combine the edges of the image of each controlled section with

labels from the corresponding section of the reference blade by rotating the l / / around its axis with the aid of a pivoting goniometric device.

If the contour of the image of the controlled section does not correspond to the dimensions between the marks, formed from the corresponding section

the reference blade, the controlled blade is blocked.

If the linear size of the image of the monitored section coincides with the linear size between the corresponding marks, then the angle of rotation 4 of the goniometric device removes the twist angle of the given cross section; no scapula. This angle is compared with the corresponding reference angle.

blades and by their difference judged the validity of the controlled blade.

Claims (1)

Formula isobteni The method of controlling the profile of turbine blades, which consists in sequentially designing images of different sections of the blade on the screen, combines the image of each The sections on the screen with the corresponding theoretical contour applied to it, compare them and judge the blade profile according to the comparison results, in order to control the angle of the turbine blade, pre-place the etalon onion blade on the rotary angle meter, successively design different sections of the reference blade on the screen, rotate each projected section to form its image of a minimum size on the screen, mark its linear dimensions with marks, when measured The controlled blades combine the edges of images of its various sections with their corresponding marks by means of the gate of the blade and the angle of rotation of the blade determines the angle of twist of its controlled section. i V4N