Device for detecting the instantaneous speed of rotation of a machine

Claim 2

A detector device for detecting the instantaneous speed of rotation of a rotating machine comprising: a first element and a second element each rotated by the machine at a speed proportional to the machine speed and designed respectively for the scanning of a low-speed range and a high-speed range of said machine; a first signal generator adapted to emit a first signal when said first rotating element occupies a predetermined angular position; a second signal generator adapted to receive the signals coming from the first signal generator and, upon receipt of such a signal, to emit a second signal; a first timer device interposed between the first and the second signal generators and adapted to delay the transmission of the first signal between said generators; a device for detecting the angular position occupied, at the instant at which the second signal is emitted, by said first rotating element, a third signal generator adapted to emit a third signal when said second rotating element occupies a predetermined angular position; a fourth signal generator adapted to receive the signals coming from the third signal generator and, upon receipt of such a signal, to emit a fourth signal; a second timer device inteRposed between the third and the fourth signal generators and adapted to delay the transmission of the third signal; and a device for detecting the angular position occupied, at the instant at which the fourth signal is emitted, by said second rotating element; said first signal generator being designed to produce, with each revolution of the rotating machine, a greater number of signals than the third signal generator; and said first timer device being designed to impose upon the first signal a delay which is shorter than the delay imposed upon the third signal by the second timer device.

Claim 3

In a turbomachine adapted to pass a gas flow and including a rotor, a fluidic detector device for detecting the instantaneous corrected speed N/ Square Root T of the rotor, wherein N is the instantaneous speed of rotation of the rotor and T the absolute temperature prevailing in a predetermined zone in the gas flow, said detector device comprising: at least one element rotated at a speed proportional to the rotor speed, said element being divided into a plurality of sectors each corresponding to a coded quantity with successive sectors subtending at the center dissimilar angles corresponding to dissimilar corrected speed ranges separated from one another by predetermined critical corrected speeds, a first fluidic signal generator adapted to emit a first fluidic signal when said element occupies a predetermined angular position; a second signal generator adapted to receive the fluidic signals coming from the first generator and, upon receipt of such a signal, to emit a second signal; an acoustic delay line interposed between the first and the second signal generators and adapted to delay the transmission of the first signal between said generators, said delay line being exposed to the gas flow in said zone; and fixed receiver means disposed behind said rotated element so that the element sectors pass successively before said receiver means, said receiver means including means sensitive to said coded quantity corresponding to the sector which, at the instant of emission of the second signal, is in position aligned with said receiver means.

Claim 4

In a turbomachine adapted to pass a gas flow and including a rotor, a fluidic detector device for detecting the instantaneous corrected speed N/ Square Root T of the rotor, wherein N is the instantaneous speed of rotation of the rotor and T the absolute temperature prevailing in a predetermined zone in the gas flow, said detector device comprising: at least one element rotated at a speed proportional to the rotor speed, said element being divided into a plurality of sectors each corresponding to a coded quantity with successive sectors subtending at the center dissimilar angles corresponding to dissimilar corrected speed ranges separated from one another by predetermined critical corrected speeds, a first fluidic signal generator adapted to emit a first fluidic signal when said element occupies a predetermined angular position; a second signal generator adapted to receive the fluidic signals coming from the first generator and, upon receipt of such a signal, to emit a second signal; an acoustic delay line interposed between the first and the second signal generators and adapted to delay the transmission of the first signal between said generators, said delay line being exposed to the gas flow in said zone; and fixed receiver means disposed behind said rotated element so that the element sectors pass successively before said receiver means, said receiver means including means sensitive to said coded quantity corresponding to the sector which, at the instant of emission of the second signal, is in position aligned with said receiver means.

Claim 5

A detector device as claimed in claim 2 wherein said receiver means supply a sequential decoding logic circuit producing, for each corrected speed range, a determinate output signal.

Claim 6

In a turbomachine adapted to pass a gas flow and including a rotor, a fluidic detector device for detecting the instantaneous corrected speed N/ Square Root T of the rotor, where N is the instantaneous speed of rotation of the rotor and T the absolute temperature prevailing in a predetermined zone in the gas flow, said detector device comprising: at least one element rotated at a speed proportional to the rotor speed; a first fluidic signal generator adapted to emit a first signal when said element occupies a predetermined angular position; a second signal generator adapted to receive the fluidic signals coming from the first generator and, upon receipt of such a signal, to emit a second signal; an acoustic delay line interposed between the first and the second signal generators and adapted to delay the transmission of the first signal between said generators, said delay line being exposed to the gas flow in said zone; said rotated element being angularly divided into a plurality of sectors and comprising, distributed thereon in accordance with a binary code and in a manner which varies from one sector to the next, portions which are respectively transparent and opaque to said second signal, said transparent and opaque portions being distributed over several separate circumferential and concentric tracks within which they form alternately transparent and opaque arcs; and a fixed receiver element associated with each of said tracks, said fixed receiver element being located in alignment with said second signal generator on the opposite side of said rotated element in order that signals produced by said second signal generator have to pass the thickness of said Rotated element before reaching the corresponding receiver element, whereby the second signal is subjected to a modulation which is a function of the coding of that sector in alignment at the time of emission of such signal with said receiver elements, said receiver elements including means sensitive to the thus coded signal.

Claim 7

In a turbomachine adapted to pass a gas flow and including a rotor, a fluidic detector device for detecting the instantaneous corrected speed N/ Square Root T of the rotor, where N is the instantaneous speed of rotation of the rotor and T the absolute temperature prevailing in a predetermined zone in the gas flow, said detector device comprising: at least one element rotated at a speed proportional to the rotor speed; a first fluidic signal generator adapted to emit a first signal when said element occupies a predetermined angular position; a second signal generator adapted to receive the fluidic signals coming from the first generator and, upon receipt of such a signal, to emit a second signal; an acoustic delay line interposed between the first and the second signal generators and adapted to delay the transmission of the first signal between said generators, said delay line being exposed to the gas flow in said zone; said rotated element being angularly divided into a plurality of sectors and comprising, distributed thereon in accordance with a binary code and in a manner which varies from one sector to the next, portions which are respectively transparent and opaque to said second signal, said transparent and opaque portions being distributed over several separate circumferential and concentric tracks within which they form alternately transparent and opaque arcs; and a fixed receiver element associated with each of said tracks, said fixed receiver element being located in alignment with said second signal generator on the opposite side of said rotated element in order that signals produced by said second signal generator have to pass the thickness of said Rotated element before reaching the corresponding receiver element, whereby the second signal is subjected to a modulation which is a function of the coding of that sector in alignment at the time of emission of such signal with said receiver elements, said receiver elements including means sensitive to the thus coded signal.