SU813485A2 - Device for registering turbo-unit rotor run-down time - Google Patents

Description

The invention relates to an electronic rotation speed signaling device operated by a rotational speed sensor and lower and upper level adjusters, and is intended to measure time separately when the speed is set or reset. given limits. According to the main auth. 729611, a device is known for measuring the run-out time of a rotor consisting of a frequency-pulse speed sensor and a meter. In the case of a vraatsen and a shaft, helix modulation with a modulating frequency proportional to the speed of rotation occurs. The number of pulses per unit time is proportional to the speed of rotation and is counted by a meter counter. Information is recorded on paper tape continuously or start-stop on the digital printing mechanism {i. A disadvantage of this device is the electrical and expensiveness of the ovizia. This is due to the fact that the pulse counting is performed by a digital frequency meter. In addition, the device does not allow selection of frequency levels for units of the beginning and end of reference. In the device, the end of reference is determined by a complete stop of the engine. Closest to the present invention is a device for recording a rundown of the rotor of a turbine unit; containing a converter of rotational speed of the rotor into an electrical proportional voltage, setting and zero-level controllers of the lower and upper levels, a two-input matching circuit and time recorder I. The disadvantage of this device is that the device registers the time of rotation frequency change in the set levels as when recruiting, and when resetting speed. Measurements usually take place on the flush speed from the upper level to the stop. If you do not provide for turning off the recorder when you set the revolutions, the recorder will measure the total time. Practically it is enough to turn off the recorder with the help of the toggle switch while typing turns. When the turbine unit is running in, it is necessary to use the switch several hundred times, which leads to unnecessary labor costs, operator fatigue and the occurrence of measurement errors.

The purpose of the invention is a separate measurement of time when you set or reset the rotor revolutions.

The goal is achieved by the fact that differentiating chains and sequentially connected polarity encoders, a switch and a pulse shaper are entered into the device, the outputs of the zero-organs are connected through the corresponding differential chains to the polarity encoder inputs, the output of the pulse shaper is connected to the third input of element I.

FIG. 1 shows a structural diagram) in FIG. 2 - stress diagrams.

The device contains a rotor 1 with magnet M. At its end, an electromagnetic sensor 2 turns, a converter 3 speeds of rotation into proportional voltage, a loaded voltage divider 4. The output of the divider 4 is connected to the input input and the zero-organ 5 of the upper level and the in-phase input and the zero-organ 6 of the lower level.

The in-phase zero-oragan input 5 and the low-level sensor 7 are connected to the output of the upper level setter 8 The zero-body inverting input of 6 is connected to the output of the setting device 7. The outputs of the zero-organs are connected to the two inputs of the element 9 and 11 and to the capacitors of the differentiating chains 10 and 11. To: differentiating chains yoks are connected via polarity encoders 12, and 12e, switch 13 to the input of the pulse former 14, the output of which is connected to the third input of the element 9, to the output of which the time recorder 15 is connected.

The device works as follows.

When the rotor 1 rotates, the magnet M induces an electromagnetic induction in the winding of the sensor 2, forming voltage pulses at the sensor output, the frequency of which corresponds to the speed of rotation. The output voltage from the speed sensor 2 is fed to the input of the converter 3 to convert the rotational speed to a proportional voltage. The output of the converter 3 is loaded on the voltage divider 4 to conduct the output voltage to the normalized level and increase the measurement accuracy.

The output voltage of the divider (Fig. 2a) is fed to the inputs of the null-bodies 5 and 6. The trigger threshold of the Udnul-organ 5 of the upper level is set by the adjuster 8, and the threshold for triggering And, the null-organ 6 of the lower level is set by the adjuster 7. To prevent the overlap of the threshold actuation of the setting device 7 is produced from the output of the setting device 8.

When the voltage at the output of the divider 4 is below the trigger thresholds, the null organ 5 outputs a logical 1, (Fig. 26), and the null organ 6 produces a logical O (Fig. 2c). , With the voltage values at the output of the divider 4 above the thresholds triggered, NIN, the null organ 5 gives a logical O, and the null organ b yields a logical 1 (Fig. 26, 2c).

Q The output voltage of the null organ 5 (Fig. 26) is differentiated by the first string 10 (Fig. 2d) and through the first encoder 12, the polarities and the switch 13 are fed to the two inputs of the pulse former.

 The output voltage of the zero-organ 6 (Fig. 2c) is diffracted by the second chain 11 (Fig. 2e) and through the second polarity encoder 12 and the switch 13 also goes to two inputs

0 pulse generator 14.

If the switch 13 is in the H position, (set of revolutions), then the pulse shaper 14 is activated by a positive pulse.

5 (Fig. 2e) formed by differentiating the leading edge of the output voltage of the second null organ 6. (Fig. 2c) and turned off from the negative pulse (Fig. 2d). Formed by differentiating the leading edge of the output voltage of the first null organ 5 (Fig. 26) -. An output pulse of the pulse driver 14 is formed (Fig. 2c).

When a pulse (Fig. 2e) coincides with a logical 1 output voltage (Fig. 26, 2c) of the null organs 5 and b, a pulse is formed at the output of the element And, with a duration corresponding to the pulse (Fig. 2e) and equal to the time of rotational speed change. a rotor at a set of turns in the set limits.

If switch 13 is in the O (rotor stop) position, then

5, the pulse shaper 14 is switched on from a positive pulse (Fig. 2d) formed by differentiating the rear edge of the output voltage of the first null organ 5 (Fig. 26) and is turned off from the negative pulse (Fig. 2e) formed by differentiating the back edge of the output the voltage of the second zero-organ 6 (Fig. 2c). Pulse output pulse pulse pulse 14

(Fig. 2g).

When a pulse (Fig. 2g) coincides with a logical 1 output voltage (Fig. 26, 2c) of the zero-organs 5 and b, an output impulse I 9 forms with a duration corresponding to the pulse (Fig. 2g) and equal to the time change rate rotation When the rotor stops.

Thus, without intervention

5 operators produced separate

Claims (1)

Claim A device for recording the time- 15 no run-out of the rotor of the turbine unit according to autosw. No. 729611, I distinguish it further by the fact that, in order to separately measure the time when typing or resetting the rotor speed, differentiating chains are introduced into it, polarity encoders are connected in series, a switch and a pulse shaper, the outputs of null organs are connected through the corresponding differentiating chains to the inputs of the polarity encoders, the output of the pulse shaper is connected to the third input of the element I.