SU1582031A1 - Heat meter - Google Patents

Abstract

The invention relates to thermometry and allows for improved measurement accuracy at low heat consumption. A unified signal from the output of the flow meter 1, proportional to the flow rate of the coolant, enters one of the diagonals of the bridge circuit. If the resistance of the thermometer 2 of the forward flow resistance is greater than the resistance of the thermometer 3 of the reverse flow resistance, a null organ is triggered, which opens the key 9. A signal from the output of the amplifier 7 to the counting device 10 passes through the open key 9. 1 sludge.

Description

The invention relates to a device ™ structure, namely, devices for measuring the flow rate and amount of heat.

| The purpose of the invention is to increase the measurement dimension with MalgH heat consumption.

The drawing shows a functional diagram of the heat meter.

The heat meter contains a flow meter 1, a bridge circuit, the shoulders of which include thermometers 2 and 3 of forward and reverse flow resistances, RESISTOR A to eliminate the technological spread of the resistance of thermometers 2 and 3, main resistors 5 and 6J amplifier 7, zero-organ 8, key 9, estimated device 10.

: Heat meter works as follows.

j Unified signal from the output of the flow meter 1 (direct current), about p | rational flow of coolant enters the diagonal b-d pavement jcx my.

The voltage on the shoulder with a resistance-flow thermometer 2 is equal to

„(Re Rb) Rft

i-d in -

Ra + Rft + R4 + RS + Rfe

G,

Voltage in the shoulder with a resistance 3 thermometer of the reverse flow is equal

VdT 1 "s + FC

XR4 + RSL

R7 + R, + R4 + R5 + Rfe When the condition Ub-a VQ-d is fulfilled (O

five

0

five

0

five

0

and it is satisfied if the resistance of the thermometer 2 of the forward flow resistance is greater than the resistance of the thermometer 3 of the reverse flow resistance, the potential in m. b (negative) with respect to the earth (m. a) is greater than the potential in m. d (positive) with respect to the ground (m. a) At the same time, these potentials are compared at the zero-body inverting input, which, when the condition (1) is fulfilled, opens the key that passes the signal from the amplifier output to the counting device. When satisfied

Ub-aЈU0 (2)

the positive potential in m. d with respect to m. and greater than or equal to the negative potential in m. b with respect to m. and the null organ closes the key, which disconnects the amplifier output from the input of the counting device.

Formula and. acquisitions

The heat meter containing the flow meter, the outputs of which are connected to the supply diagonal of the bridge circuit, with forward and return flow resistance thermometers in the adjacent arms, the output diagonal of which through the amplifier and the key is connected to the counter, and the zero-body output connected to the control input of the key This is due to the fact that, in order to improve the measurement accuracy, two resistors were inserted into it, connected by one pin to the supply diagonal of the bridge circuit, and the other to the input of the zero-organ.

Editor T. Parfenova

Compiled by V. Yarych

Tehred L. Serdkzhova Proofreader T. Malets

Order 2081

Circulation 500

VNIIPI State Committee for Inventions and Discoveries at the State Committee on Science and Technology of the USSR. 113035, Moscow, Zh-35, Raushsk nab. 4/5

Subscription

Claims (1)

Claim A heat meter containing a flow meter, the outputs of which are connected to the supply diagonal of the bridge circuit, with forward and reverse flow resistance thermometers in adjacent shoulders, the output diagonal of which is connected to the meter through an amplifier and a key, and a zero-organ output connected to the key control input characterized in that, in order to increase the measurement accuracy, two resistors are introduced into it, connected by one of the leads to the supply diagonal of the bridge circuit, and others to the input of the zero-organ. Compiled by V. Yarych Editor T. Parfenova Tehred L. Serdyukova Corrector T. Malets Order 2081 Circulation 500 Subscribed VNIIIPI State 113035, Committee on inventions and discoveries at the SCST USSR. Moscow, Zh-35, Raushskaya nab., D. 4/5 Production and Publishing Plant Patent, Uzhgorod, st. Gagarina, 101