SU681443A2

SU681443A2 - Shaft speed indicator

Info

Publication number: SU681443A2
Application number: SU782585167A
Authority: SU
Inventors: Анатолий Георгиевич Павлов
Priority date: 1978-03-01
Filing date: 1978-03-01
Publication date: 1979-08-25

Description

;54) СИГНАЛИЗАТОР СКОРОСТИ ВРАЩЕНИЯ ВАЛА; 54) SPARING ROTATION ALARM SIGNAL

II

Изобретение относитс к автоматической сигнализации и может быть использовано , например, дл сигнализации скорости враше и вала в газотурбинных агрегатах магистральных газопроводов.The invention relates to automatic signaling and can be used, for example, for signaling speed and shaft speed in gas turbine units of main gas pipelines.

Из основного авт. св. К 486339 известен сигнализатор скорости вращени вала, содержащий датчик, формирователь и частотное сигнализирующее устройство Недостатком этого сигнализатора вл етс возможность выдачи ложных сигналов при значени х скорости вращени вала, не равных заданному значению, например при трогании, а также от суммарного сигнала датчика и помех при достижении им порога чувствительности формировател .From the main auth. St. By 486339, a shaft speed indicator is known that contains a sensor, a driver, and a frequency signaling device. The disadvantage of this indicator is the possibility of producing spurious signals at shaft rotation speeds that are not equal to a specified value, for example, when starting, as well as from the total sensor signal and interference it reaches the threshold of shaper sensitivity.

Цель изобретени - исключение ложно вьщачи сигнала.The purpose of the invention is the elimination of a false signal.

Поставленна цель дост1п: аетс тем, что в сигнал-изатор скорости вращени вала дополнительно введен вьтр митель, фильтр нижних частот и управл емый по- 10СОВОЙ фильтр, причем выход датчикаThe goal of access is: the fact that a rotary filter, a low-pass filter and a controlled 10SOVA filter are additionally introduced into the signal-isator of the shaft rotation speed, and the sensor output

соединен с ин4х5рмац 1онным входом управл емого полосового ф.ильтра и входом вылр мител , выход которого через фильтр нижних частот соединен с управл ющим входом управл емого полосового фильтра, при этом выход управл емого полосового фильтра соединен с входом форм1фовател .connected to an inlet with a single input of a controlled bandwidth filter and an input switch, the output of which is connected to the control input of a controlled bandpass filter through a low-pass filter, and the output of the controlled band filter.

На чертеже изображена структурна схема предлагаемого устройства.The drawing shows a structural diagram of the proposed device.

Сигнализатор корости вращени вала содержит датчик 1, форм1фователь 2, частотное С1тгнализируюшее устройство 3, вьтр митель 4, фильтр шгжних частот 5 и управл емый полосовой фильтр 6.The indicator of speed of rotation of the shaft contains a sensor 1, a formatter 2, a frequency C1-signaling device 3, an attenuator 4, a frequency filter 5 and a controlled band-pass filter 6.

Сигнализатор работает следующим образом .The detector works as follows.

Claims

The signal from sensor 1, whose frequency is proportional to the speed of the shaft's rotation, and the amplitude increases with increasing speed, together with the noise signal and the electromagnetic interference signal goes to the information input of the tunable band-pass filter 6 and simultaneously to the input of the miter 4. The output of the miter is connected low pass filter 5, the highest function of the smoothing filter and having a time constant corresponding to the time constant of the accelerated shaft. From the filter's output, the signal goes to the control input of the controlled band-pass filter. The voltage-frequency characteristic of the bandpass filter is selected so that an increase in the voltage on the control to the cement input corresponds to an increase in the resonant frequency of the filter. At the same time, each sensor frequency corresponds to its filter resonance frequency, and the passband is chosen from the condition of reducing the noise and noise level at the filter output to values below the sensitivity threshold of the former. Thus, the use of a tunable bandpass filter at the input of the sigpalizator of the rotation speed of the shaft and the exclusion of spurious signals, and, consequently, false stops and. Yuvtornye units starts. Claims: Shaft speed indicator according to ed. St. No. 486339, which means that, in order to exclude a false signal, a rectifier, a low-pass filter and a controllable band-pass filter are additionally added to it, with the output of the sensor connected to the information input of the controlled band-pass filter and rectifier input, the output of which through a low-pass filter is connected to the control input of the controlled bandpass filter, while the output of the controlled band-pass filter is connected to the input of the former.