SU591766A1 - Moving stream device for measuring engine shaft number of revolutions - Google Patents

Description

(54) JET DEVICE FOR MEASURING THE NUMBER OF TURNS OF THE ENGINE SHAFT

one

The invention relates to measuring devices, in particular, to measuring the number of revolutions of an engine shaft, and can be used, for example, to measure the number of revolutions of shafts of gas turbine engines (GTE), as well as in automatic control systems for GTE.,

At present, devices for measuring the rotational speed of a shaft consisting of a pitash nozzle, a power jet breaker disk connected to an engine shaft or other adjustable object, a receiving Canada and a jet i trigger meter {ij.

The disadvantages of these VCTOOUCTBs are the limited sensitivity and accuracy of the measurement at high frequencies.

The closest to the technical essence is an inkjet device for measuring the rotational speed of an engine shaft, which has a first disk with openings coaxially with a supply nozzle connected to the source of air pressure, a receiving channel and a second disk with openings connected to the engine shaft installed between the first disk

and the receiving channel 2. However, such a device lacks the accuracy of measuring the angular rotation of the motor shaft.

The purpose of the invention is to improve the accuracy of measuring the speed of the shaft while maintaining high sensitivity.

This is achieved by the fact that in the inkjet device the second disk is also kinematically connected with the engine shaft, the disks being made with a different number of holes, and the kinematic connection nodes with different gear ratios, the receiving channel is connected to the jet trigger counter,

The drawing shows a block diagram of a device for measuring engine speed.

Claims (2)

The jet device comprises a first disk 2 kinematically connected with the shaft 1 of the engine, with holes coaxially with them. loosening, power supply nozzle 3 communicating with the post 4 before the compressor, receiving channel 5 and sec (A disk 6 with openings installed between the first disk and the receiving channel. The second disk is kinematically connected to the engine shaft and the receiving channel is connected with the jet trigger counter 7, with both disks made with a different number of holes 8, 9, and the kinematic links iO, 11 are made with different gear ratios. The jet device works as follows: The shaft 1 of the engine, the revolutions (h. dv) of which must be measured kinema connected By using a gear ratio .t with disk 2 having NJ holes 9. When the disk 2 crosses the jet coming out of the power nozzle, impulses of yes & levi with frequency proportional to the revolutions of the shaft 1 bdb -N1 shaft 1 are connected also a kinematic link 11. with a gear ratio with a dask 6 having N2 holes 8 (.Ni N4). At the crossing of the jet oscillations are generated J. In the receiving canape 5 pressure pulses occur with a beat frequency f6 carrying information about measured revolutions : „, Ht. i. l g NI- K Nah46 f. - Ts-601g-60, 2 2. (A) - Jk 2-60 vTi7 L, / in general, fj ib.p6 KZ Cl i proportionality coefficients In meter 7, pressure pulses are read out. By selecting a set of 1 fa frequencies of the number of holes of the diodes 2 and 6, as well as the gear ratios i and i of the kinematic links of the disks 2 and 6 with the shaft 1, it is possible to measure large speeds of rotation of the shafts, as well as adjust the measurement zone of the device, maintaining high sensitivity. In this case, due to the fact that the constant speed drive is eliminated, the accuracy of the speed measurement increases. An inkjet device for measuring the rotational speed of an engine shaft comprising kinematically associated with a motor shaft a first disc with openings coaxially with which a pitash nozzle 1 is connected, connected to an air pressure source, a receiving channel and a second disc with openings installed between the first disk and the receiving channel, characterized in that, in order to improve the accuracy and measurements, the second disk is also kinematically connected with the motor shaft, and the disks are filled with a different number of holes, and the nodes connection with different ratios, the receiving channel of the St. zan with the jet trigger counter. Sources of information received during examination: 1. Zapmanzon L. Ai Aerohydrodynamic (methods for measuring the input parameters of automatic systems. M., Nauka, 1973j, p. 281.% 2. For application N 21689О9 / 10, кп. GrOl P 3/22, 06/29/76.