SU832358A1 - Heat meter - Google Patents

Description

one

The invention relates to devices for measuring the heat consumption generated or consumed by heat and power plants with equal flow rates of the heat-transfer fluid in the forward and return pipelines.

A heat meter is known that contains a pulse flow sensor, two temperature sensors installed in the forward and reverse pipelines, a temperature difference converter. To current, a current-frequency converter, the output of which is connected to a counter l through a frequency divider.

The disadvantages of the heat meter are lower measurement accuracy, the complexity of the electronic circuit.

The closest to the invention to the technical nature is a heat meter, which contains temperature sensors with frequency output, installed in the heat transfer direct and return pipelines, heat flow rate sensor with frequency output, latitude H9-pulse modulator, measuring counter p.

A disadvantage of the known heat meter is the low accuracy of measuring the amount of heat, since it does not take into account the change in the density of the coolant depending on its temperature at the location of the coolant flow sensor.

The purpose of the invention is to improve the accuracy of measuring the amount of heat.

The goal is achieved by the introduction of two circuits in the heat meter. we AND, the OR circuit, a binary counter, a frequency divider whose input is connected to the output of the first AND circuit, and the output is connected to a measuring counter, the outputs of the flow and temperature sensors located in the pipeline are connected to the inputs of a pulse-width modulator, the output of which is connected to the first input of the first circuit And, the output of the second temperature sensor is connected to the second inputs of the circuits And, and the outputs of the circuits

0 And connected to the inputs of the OR circuit, the output of which is connected via a binary counter to the second trigger input.

The drawing shows the block diagram of the heat meter.

five

The heat meter contains a heat carrier flow sensor 1 with a frequency output, temperature sensors 2 and 3 with a frequency output installed in the forward and reverse pipelines 4 and 5, a pulse-width modulator b, including trigger 7, circuit 8, and binary the pulse counter 9, the trigger 10, the first circuit AND 11, the second circuit AND 12, the circuit OR 13, the binary counter 14, the frequency divider 15 and the measuring counter 16. The heat meter works as follows. The sensor of the coolant flow rate expresses, the pulses are bouncing, the frequency of which is proportional to the coolant flow rate. These pulses trigger trigger 7 of a pulse width modulator b. The output signal from the trigger 7 is supplied to the inputs of the circuits 8 and 12, the second inputs of which are connected to the sensors 2 and 3 of the temperature. At the same time, through the circuit AND 8, the pulses from the temperature sensor 2 arrive at the input of the binary pulse counter 9, and the sender 3 of the temperature through the circuit 11 and OR 13 to the input of the binary counter 14 pulses. After a period of 2 and XT-: - ./1. - - 1) where K is the number of bits in binary counters 9 and 14, f. - the frequency of the pulses at the output of the sensor 2 temperature. The counter 9 of the pulse-width modulator b is filled and the signal that appears at its output returns the trigger 7 to the initial state, thereby removing the enable signal from the inputs of the circuits 8 and 12, and stopping the flow of pulses from the temperature sensor 2 and 3 to binary counters 9 and 14 pulses. Thus, during the action of the pulse C, formed by the pulse-width modulator, n pulses go to the pulse counter 14 —–, Y.

f output pulse frequency

Where

temperature sensor 3. The falling edge of the pulse formed by the pulse-width modulator b triggers trigger 10. The signal from its output enters the input of the And 11 circuit, the second input of which is connected to the temperature sensor 3. As a result, the pulses from the temperature sensor 3 flow through cxeji y And 11 and through the frequency divider 15 to the measuring counter 16, and through the circuit 12 and OR 13 to the binary counter 14.

This will continue until binary counter 14 is filled and the signal that emerges at its output flips trigger 10 to its original state, thereby removing the enable signal from the input of the AND 11 circuit and stopping the flow of pulse C0 from the output of temperature sensor 3 to counter 14 and frequency divider 15. per hour from V pulsed rds. p shi ed che gd then that for those no er

Claims (2)

1. The patent of France 2308095, cl. G 01 K 17/10, published. 1976. 2. USSR author's certificate 5 №465563, cl. G 01 K 17/16, 1973 (prototype).