CN201828333U - Steam turbine generator set vibration key phase signal preprocessing circuit - Google Patents

Abstract

The utility model provides a steam turbine generator set vibration key phase signal preprocessing circuit. The circuit further comprises a voltage trigger circuit, a photoelectric isolation circuit and a squaring circuit. Due to the preprocessing circuit, various types of burr interference can be effectively eliminated, accurate square-wave key phase signals can be obtained, the purpose of processing the key phase signals of different sensors in different electric power plants can be achieved, and more accurate, convenient-to-analyze key phase signals can be provided for sites.

Description

Turbo-generator Set Vibration key signal pre-process circuit

Technical field

The utility model relates in the electric system fuel-burning power plant Turbo-generator Set or huge revolving machinery is carried out the field that oscillating bond is measured mutually.

Background technology

Since 20th century, Turbo-generator Set in commercial production and science and technology development, the effect that play more and more is important.Steam Turbine is a large rotating machinery, and it sends electric energy with high temperature, high pressure steam had the interior mechanical energy that can convert the rotation of machine group rotor to thereby drive other machineries or drive generator.Steam Turbine is the visual plant of industrial circle, and particularly in power industry, Steam Turbine is crucial equipment.Because the Steam Turbine structure and the complicacy of system, the singularity of running environment, the failure rate of Steam Turbine is higher, and the harmfulness of fault is also very big.Therefore, the fault diagnosis of Steam Turbine is the importance that the fault diagnostic techniques is used always.

Development along with China's electric utility, thermal power plant's installed capacity of country's construction in recent years constantly increases, shaft system of unit length increases, and makes the possibility of Turbo-generator Set generation vibration fault increase, and the reliability, availability, and maintainability of equipment and the problem of security become increasingly conspicuous, in case have an accident, just may cause the fracture of axle system, collapse, its consequence is catastrophic, and loss also will be very heavy, therefore, the Turbo-generator Set Vibration on-line monitoring is had higher requirement.In the unit vibration signal sampling, in order to improve the precision of vibration signal analysis of spectrum, the general method of sampling that adopts synchronous complete cycle, for this reason, in the unit rotating shaft, open a key phase groove, load onto a vibration signal sensor, pulse of revolution output when axle rotates, the pulse signal of output is key signal, this signal is to realize integer-period sampled prerequisite synchronously, therefore, key is as a signal of interest of unit vibration on-line monitoring, and it is particularly important that the method for its pre-service and measurement and order of accuarcy just seem.

Summary of the invention

The technical problems to be solved in the utility model is the accurate handling problem of Turbo-generator Set Vibration key signal, its fundamental purpose is the pre-process circuit that proposes a kind of Turbo-generator Set Vibration key signal, start with from the front end signal processing circuits, in signal processing circuit, add voltage triggering circuit, utilize the 2/3Vcc of NE555 to trigger function, reaching key triggers mutually, eliminate the purpose that burr disturbs, use the 6N137 integrated circuit to play the photoelectricity buffer action simultaneously, further the burr in the pulse of cancel key phase disturbs, the last circuit of being made up of NE555 carries out the square wave shaping, by adjusting resistance sizes, adjust key phase pulsating wave dutycycle, obtain the standard square wave.

A kind of Turbo-generator Set Vibration key signal pre-process circuit is characterized in that, described circuit comprises voltage triggering circuit part, photoelectric isolating circuit part and squaring circuit part successively by signal processing sequence;

The input of described voltage triggering circuit part links to each other with the preprocessor of vibration signal sensor on being installed in the Turbo-generator Set main shaft, and the output of described voltage triggering circuit part links to each other with the input partly of described photoelectric isolating circuit;

The output of described photoelectric isolating circuit part links to each other with the input of described squaring circuit part.

Described voltage triggering circuit partly comprises the NE555 module, and its main pin configuration is: Pin1 is a grounding leg; Pin2 is for triggering input pin; Pin3 is an output pin; Pin4 is the input pin that resets; Pin5 passes through capacity earth; Pin6 is the threshold value input pin, with the Pin2 short circuit together, as the input end of trigger, constitute Schmidt trigger; Pin8 is a supply pin, all is connected to high level Vcc with Pin4.

Described photoelectric isolating circuit partly is the 6N137 integrated circuit.

Described squaring circuit partly comprises the NE555 module, wherein, Pin2 is an input pin, Pin3 is an output pin, if Pin2 imports less than 1/3Vcc, then Pin3 exports high level, if the Pin2 input is greater than 2/3Vcc, Pin3 output low level then, its Pin6 and pin7 short circuit are provided with variohm between this short circuit point and the power supply.

Described circuit comprises the signal inversion circuit part, and this circuit part comprises 7414 modules, first wire jumper and second wire jumper between described photoelectric isolating circuit part and described squaring circuit part;

The Pin14 of described 7414 modules connects power supply, Pin7 ground connection, and signal enters from Pin1, exports from Pin2;

First connection jaws of described first wire jumper links to each other with the Pin1 of described 7414 modules, and second connection jaws links to each other with the output of described photoelectric isolating circuit part, and the 3rd connection jaws links to each other with the 3rd connection jaws of described second wire jumper;

First connection jaws of described second wire jumper links to each other with the Pin2 of described 7414 modules, and second connection jaws links to each other with the input of described squaring circuit part.

The beneficial effects of the utility model are by above-mentioned circuit link reasonable in design, eliminate various burrs effectively and disturb, and obtain accurate key-phase square-wave signals, and this circuit can realize handling the purpose of different power plant, dissimilar sensor key signal.

Description of drawings

Below in conjunction with accompanying drawing the utility model is elaborated:

Fig. 1 measures key signal device synoptic diagram for Turbo-generator Set;

Fig. 2 is the original key signal output waveform figure of sensor;

Fig. 3 is for through every directly, key signal output waveform figure after the NE555 module 2/3Vcc voltage triggered;

Fig. 4 is the 2/3Vcc voltage triggering circuit synoptic diagram of signal processing circuit;

Fig. 5 is for pulse signal photoelectricity is isolated, the squaring circuit synoptic diagram;

Fig. 6 is through the key signal output waveform figure after above-mentioned all processing links.

Embodiment

In one embodiment of the invention, on the main shaft 1 of Turbo-generator Set, drive a keyway, vibration signal sensor 2 (being current vortex sensor) is installed, as shown in Figure 1, measure original key signal.Key phase/the tach signal of main frame and crucial subsidiary engine generally comes from spot sensor or introduces (TSI system outputs such as BENTLY3300/3500, ENTEK, PHILIP) from secondary instrument.

The waveform of original key signal process current vortex sensor preprocessor output as shown in Figure 2, be negative bias pulsating volage signal with respect to preprocessor GND end, this key signal is used for to the rotating machinery reference signal integer-period sampled with vibration signal that test the speed.Therefore, become the Signal Pretreatment of preprocessor output the square-wave signal of standard to handle for follow-up circuit or computing machine again, tool has very important significance.Adopt the vibration eddy current signal sensor 2 and the preprocessor thereof of U.S. BENTLY company in the present embodiment.

The key signal pre-process circuit by stopping direct current, voltage triggered, photoelectricity isolate, anti-phase, square wave shaping 5 parts form, as Fig. 4, shown in Figure 5.The GND of the current vortex sensor 2 preprocessor output signals common port of circuit therewith links to each other, and the signal end INPUT end of circuit therewith links to each other.

Capacitor C j1 plays the stopping direct current effect, makes negative bias signal as shown in Figure 2 become zero inclined to one side negative pulse; NE555 among Fig. 4 plays the voltage triggered effect of key signal, and its main pin configuration is: Pin1 is a grounding leg, links to each other with the GND end of preprocessor output signal; Pin2 is for triggering input pin, when trigger pip upper limb voltage greater than 2/3Vcc, lower edge triggers Pin3 (output pin) output high level during greater than 1/3Vcc, key signal end pin therewith links to each other; Pin4 is the input pin that resets, and when a low level was delivered to this pin, output pin Pin3 was a low level, and Pin4 and supply pin Pin8 are connected to the Vcc high level; Pin6 is the threshold value input pin, and it and Pin2 pin short circuit as the input end of trigger, constitute Schmidt trigger together.

The characteristics of NE555 are among Fig. 4, when the signal of input pin Pin2 during greater than 2/3VCC, output pin Pin3 can export stable high level, utilize this triggering function of NE555, adjust the size of Vcc according to the peak value of pulse size of on-the-spot key phase sensor signal, make key phase pulse upper edge voltage greater than 2/3Vcc, and the burr crest voltage is tried one's best less than 2/3Vcc, when the pulse of key phase arrives, and the high level that the output of Pin3 pin is stable, after the pulse of key phase disappears, the low level that Pin3 pin output is stable, and when burr disturbs arrival, because of its crest voltage less than 2/3Vcc, can not trigger NE555, the output of Pin3 pin still is stable low level.By this link, reach the pulse of key phase and pass through, and the effect of burr voltage conductively-closed, realize eliminating the purpose that burr disturbs, result as shown in Figure 3, the burr in visible Fig. 2 input signal is filtered at the output pin of NE555.

The 6N137 photo-coupler is a single pass high-speed light coupling device that is used among Fig. 5, it is kept apart input and output from electric, by reasonable disposition Rj4 resistance parameter, can stop most of the interference, comprise that burr disturbs, and, this integrated circuit used, can guarantee that not only security of system works reliably, also can reduce engineering cost.

In another embodiment of the present invention, key signal is provided by key phase piece that protrude rather than indent, at this moment, the output pulse of current vortex sensor is anti-phase, for reaching circuit two kinds of all applicable purposes of situation, needing increases anti-phase link, as 7414 modules among Fig. 5.This module Pin14 pin connection+5V power supply, signal enters the Pin1 pin, from the output of Pin2 pin, realizes the effect of signal inversion.Whether signal is anti-phase, can realize by wire jumper Jjianx1, Jjianx2, anti-phase when 1,2 pin short circuits, during 2,3 short circuits, not anti-phase.

Treated key signal enters that NE555 carries out the square wave shaping among Fig. 5, circuit rigidly connects when leading to, the Cj5 capacitance voltage is zero, the Pin2 of NE555 time-base integrated circuit and Pin6 pin are less than 1/3Vcc, its Pin3 pin output high level is to the Cj5 charging, when the voltage linear on the Cj5 rises to 2/3Vcc, the Pin6 pin of NE555 triggers, and makes Pin3 pin output low level.Electric charge on the capacitor Cj5 begins discharge at this moment, and when the voltage linear on the Cj5 dropped to 1/3Vcc, the Pin2 pin of NE555 triggered, and makes the set of Pin3 pin, and the output high level so goes round and begins again, and just can obtain square wave at the Pin3 of NE555 pin.By changing the resistance of resistance R JVR, can change the dutycycle of output square wave, obtain the standard square wave.Last output waveform as shown in Figure 6.

By above-mentioned key signal pre-process circuit, can effectively eliminate various burrs interference in the Turbo-generator Set Vibration key signal, obtain accurate key-phase square-wave signals, and this circuit can be handled different power plant, dissimilar sensor key signal, and the scene be convenient to is analyzed accurately and effectively to key signal.

Claims (5)

1. a Turbo-generator Set Vibration key signal pre-process circuit is characterized in that, described circuit comprises voltage triggering circuit part, photoelectric isolating circuit part and squaring circuit part successively by signal processing sequence;

The input of described voltage triggering circuit part links to each other with the preprocessor of vibration signal sensor on being installed in the Turbo-generator Set main shaft, and the output of described voltage triggering circuit part links to each other with the input partly of described photoelectric isolating circuit;

The output of described photoelectric isolating circuit part links to each other with the input of described squaring circuit part.

2. circuit as claimed in claim 1 is characterized in that described voltage triggering circuit partly comprises the NE555 module, and its main pin configuration is: Pin1 is a grounding leg; Pin2 is for triggering input pin; Pin3 is an output pin; Pin4 is the input pin that resets; Pin5 passes through capacity earth; Pin6 is the threshold value input pin, with the Pin2 short circuit together, as the input end of trigger, constitute Schmidt trigger; Pin8 is a supply pin, all is connected to high level Vcc with Pin4.

3. circuit as claimed in claim 1 is characterized in that, described photoelectric isolating circuit partly is the 6N137 integrated circuit.

4. circuit as claimed in claim 1, it is characterized in that described squaring circuit partly comprises the NE555 module, wherein, Pin2 is an input pin, Pin3 is an output pin, if Pin2 imports less than 1/3Vcc, then Pin3 exports high level, if the Pin2 input is greater than 2/3Vcc, Pin3 output low level then, its Pin6 and pin7 short circuit are provided with variohm between this short circuit point and the power supply.

5. as each described circuit in the claim 1～4, it is characterized in that, described circuit comprises the signal inversion circuit part, and this circuit part comprises 7414 modules, first wire jumper and second wire jumper between described photoelectric isolating circuit part and described squaring circuit part;

The Pin14 of described 7414 modules connects power supply, Pin7 ground connection, and signal enters from Pin1, exports from Pin2;

First connection jaws of described first wire jumper links to each other with the Pin1 of described 7414 modules, and second connection jaws links to each other with the output of described photoelectric isolating circuit part, and the 3rd connection jaws links to each other with the 3rd connection jaws of described second wire jumper;

First connection jaws of described second wire jumper links to each other with the Pin2 of described 7414 modules, and second connection jaws links to each other with the input of described squaring circuit part.

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