SU1548798A1 - Device for modelling sagging of turbine casing - Google Patents

Abstract

The invention relates to the field of analog-digital computing and is intended to effectively control the radial clearances between the rotor and the turbine housing, as well as to prevent an emergency situation during its operation. The purpose of the invention is to improve the accuracy - it is achieved by the fact that blocks are inserted into the device that allow the signals from the sensors (thermocouples) to be passed through successively through one amplifier, memorize these signals in digital form and process them at the end of each work cycle. 1 il.

Description

The invention relates to analog-digital computing and is intended to effectively control the radial clearances between the rotor and the turbine housing, as well as to prevent an emergency situation during its operation.

The purpose of the invention is to improve the accuracy of modeling.

The drawing shows a diagram of the device.

The device comprises a processing, transformation and storage unit 1, a decision unit 2, a registration unit 3, a voltage divider 4 and a control unit 5.

The information processing, conversion and storage unit 1 consists of sensors 6 for the turbine housing temperature, switch 7, lower filter 8, amplifier 9, analog-to-digital converter (ADC) 10 and digital-to-analog converters (DAL) 11.% Block 2 of the solution consists of subtractors 12 , adders 13 and comparators 14.

The control unit 5 consists of a generator of 15 pulses, counters 16 and 17, decoders 18 and 19, a trigger of 20 groups, And 21-22 elements and a first 23 and second 24 elements I. Thermocouples are used as sensors 6 to determine the temperature of the top and bottom controlled by the turbine hull sah.

The device works as follows.

The initial state of the counters 16 and 17 is zero, the first outputs of the decoder 18 and 19 are in the unit state, the rest are zero, in the output of the trigger 20 and in the output of the first element And 21 the unit state. Switch 7 to the low pass filter 8 connect the first sensor 6, the signal from it,

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amplified by amplifier 9, is fed to the input of the ADC 10. With the arrival of the first pulse to the counting input of the counter 16, its state changes by one, 1 appears at the second output of the decoder 18 and is fed to the enable input of the ADC 10, allowing the conversion to start, With the arrival the next pulse 1 appears at the third output of the decoder 18, this signal is converted to A / D converter 0 and the trigger 20 goes to the zero state, disconnecting the first sensor 6 from the input of the low-pass filter 8. At the next pulse 1, it appears at the fourth output of the decoder 18 and at the output of the first element II 22, which is given permission to write to the first register of the first CCL 11, with the arrival of the next pulse 1 appears at the fifth output of the decoder 18 and changes the state of the counter 17, 1 also appears on the second output of the decoder 19.

With the arrival of the next pulse, the counter 16 is again set to the zero state, the trigger 20 is set to one, the second sensor b is connected to the input of the lower filter 8 and the device continues to work according to the described algorithm until the first registers of all DAC 11 are written to voltage codes proportional to the EMF values of all thermocouples. With the arrival of the next pulse at the fifth output of the decoder 18, the signal 1 transfers the counter 17 to the next state and the signal 1 appears at the last output of the decoder 19, and hence at the second inputs of the elements 23 and 24. At the same time, the next pulse At the first output of the decoder 8 and through the element 23, it enters the DAC resolution inputs And, as a result, simultaneous overwriting of information from the first registers to the second registers occurs, analog signals proportional to the EMF values of the thermocouples appear at the output of the DAC 11 which are fed to the corresponding inputs of the subtractors 12, at the outputs of which potentials are formed, proportional to the temperature differences of the respective pockets, and fed to the corresponding inputs of the adders 13. At the outputs of the adders 13, the potentials $ corresponding to the deflections of the hull are formed

The bins in the measuring cells that go to the corresponding inputs of the registration unit 3 and the first inputs of the corresponding comparators 14, the second inputs of which are supplied with the potential equivalent of the allowable deflection, are formed by the voltage divider 4. If the value of the deflection signal exceeds the value of the potential of the analogue of the allowable value of the deflection, then from the output of the comparator 14 the alarm signal goes to block 3 of registration.

Claims (1)

Invention Formula 0 five 0 five 40 50 55 A device for simulating a deflection of a turbine housing containing an amplifier, 2p temperature sensors of the turbine housing, n adders, a switch, an amplifier, a pulse generator, a voltage divider and n exhausters, the outputs of which are connected to the corresponding inputs n of the adders, the output of each comparator is connected to the corresponding input first groups of the registration unit, the temperature sensor outputs of the turbine housing are connected to the corresponding information inputs of the switch, characterized in that, in order to increase the accuracy of the mod a low-pass filter, an analog-to-digital converter, 2 n digital-to-analog converters, first and second counters, first and second decoders, two AND elements, a trigger and two groups of 2p AND elements, switch output through a low-pass filter connected in series and the amplifier is connected to the information input of the analog-to-digital converter, the output of which is connected to the information inputs of the digital-to-analog converters, the outputs of each pair of which are connected to the inputs of the corresponding the subtractor, each output of the adder is connected to the corresponding input of the second group of the registration unit and to the first input of the corresponding comparator, the second input of which is connected to the output of the voltage divider, the output of the pulse generator is connected to the counting input of the first counter, the outputs of which are connected to the inputs of the first decoder, the first output which is connected to the first input of the first element And and with a single input