RU2015133696A - DEVICE FOR DETERMINING LEAKAGE PLACES IN PIPES OF URBAN HEAT NETWORKS - Google Patents

Claims (4)

A device for determining the place of a leak in the pipes of urban heating networks, containing the first and second vibration sensors installed at the ends of the diagnosed section of the pipeline, connected in series to the output of the first vibration sensor, a first amplifier, a first filter, a first analog-to-digital converter, a digital correlator, the second input of which connected to the output of the decoder, and the display, connected in series to the output of the second vibration sensor, a second amplifier, a second filter, a second analog-to-digital converter b, an encoder and a transmitter made in the form of a series-connected high-frequency generator, a phase manipulator, the second input of which is connected to the output of the encoder, power amplifier and transmitting antenna, a receiver with a receiving antenna, to the output of which a phase doubler, a first spectral width meter, are connected in series, a comparison unit, the second input of which is connected to the output of the receiver through a second spectral width meter, the first threshold block, the first key, the second input of which is connected to the output of the receiver, the first a multiplier, the second input of which is connected to the output of the first low-pass filter, a narrow-band filter, a second multiplier, the second input of which is connected to the output of the first key, the first low-pass filter and the second subtraction unit, the output of which is connected to the input of the decoder, while to the output of the narrow-band filter connected in series are a + 30 ° phase shifter, a third multiplier, the second input of which is connected to the output of the first key, a second low-pass filter, a first subtraction unit and a + 90 ° phase shifter, the output of which is connected nen with the second input of the second subtraction unit, a phase shifter of -30 °, a fourth multiplier, the second input of which is connected to the output of the first key, and a third low-pass filter, the output of which is connected to the second input of the first subtraction unit, which is connected to the narrowband filter output, are connected in series with a second input of the first subtraction unit, characterized in that the receiver is made in the form of a high-frequency amplifier, a first mixer, the second input of which is connected to the output, connected in series to the receiving antenna ohm of the first local oscillator, the first intermediate frequency amplifier, analog correlator, the second threshold block and the second key, the second input of which is connected to the output of the first intermediate frequency amplifier, and the output is connected to the inputs of the phase doubler, the second spectral width meter and the first key, and to the amplifier output a second mixer, the second input of which is connected to the output of the second local oscillator, and a second intermediate-frequency amplifier, the output of which is connected to the second output a alogovogo correlator frequency W W _{U2 G1} and the first and second local oscillators are separated by twice the value of the intermediate frequency

and are selected symmetrical with respect to the carrier frequency W _{C of the} main receiving channel

.