SU721661A1 - Apparatus for determining turbomachine rotor blade runout - Google Patents

Description

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The invention relates to the field of turbine construction.

A device for determining the beating of the rotor blades of a turbomachine is known, which contains supporting elements and a reading device with contact rods and intermediate arms (or 1).

However, with such an implementation of the device, the beat determination technology is rather complicated.

The closest to the proposed technical entity is a device containing a supporting prize Nfcj, and an indicator device 2.

However, the technology of determining the beat and with such an implementation of the device remains quite complex and, moreover, the accuracy of the determination of the beat is not high enough.

The aim of the invention is to improve the accuracy and simplification of the technology.

The goal is achieved by the fact that in the proposed device the device is designed as an indicator clock and the rods of the latter are placed under the blades, and the console parts of the plates are fixed to the rods, equipped with strain gauges connected through an amplifier with an oscilloscope;

FIG. 1 shows the proposed device; in fig. 2 - the same view from the end of the rotor.

The device contains supporting prisms 1 for mounting the rotor 2 with blades 3, mounted on a plate 4, on which an indicator device is also installed in the form of indicator hours 5, the rods 6 of which are placed under the blades 3. On the rods 6 are fixed console parts of the plates 7 on which the load cells are glued 8. The other end of the plate 7 is fixed in the supports 9. The load cells 8 are connected through an amplifier 10 to an oscilloscope 11,

To determine the beating of the blades 3, rotor 1 is rotated on prisms 1.

This blades 3 casgiots players 6 indicator hours 5. The rods 6, moving, bend the plates 7. The signal from the strain gauges B (whose strength increases with increasing deflection

5 plate 7) is fed through amplifier 10 to an oscilloscope 11, where it is recorded onto an oscillographic film. Next, the diameters of the location of the peripheral ends of the batches 3 are determined. These are proportional to

amplitudes of peaks on the oscillogram. The difference between certain diameters corresponds to the magnitude of the beating. Before the start of the determination of the beating, the strain gauges 8 are calibrated according to the indications of the indicator hours 5.

Improving the accuracy of determining the beat is associated with the exception of the error due to the subjectivity and heterogeneity of taking readings from indicator hours 5, and the simplification of the technology is due to the reduction in measurement time.

Claims (2)

1. Author's certificate of the USSR 200188, cl. G 01 B 5/20, 1965. 2. Repair of AI-20 turboprop engine, section 4, g, 5, Vneshtorgizdat, order number 5750, p. 64. wednesday-9 ff