SU932281A1 - Surface thermal converter - Google Patents

Description

(54) SURFACE THERMAL TRANSFORMER

one

The invention relates to the field of thermometry and can be used in systems for the automatic control and regulation of the surface temperature of solids, near-wall layers of liquid and gaseous media.

Thermal converters are known that contain additional heaters connected to the power supply and the 1 J emission system.

The disadvantages of these devices are design complexity and low reliability due to the presence of additional heaters.

A thermoconverter containing a series-connected thermistor and a thermocouple is known. The disadvantages of a thermoconverter include its limited use, large static and dynamic error, and low reliability.

The purpose of the invention is to show the accuracy, speed and impairment of the structure of the surface thermal converter.

This goal is achieved by the fact that the mopar is filled with a differential one, and its common electrode is made in the form of a thermistor. At the same time, the parameters of the differential thermocouple and the thermistor are connected by coupling.

iSifto-ctr -,

ten

where 3 is the measuring current of the thermocouple; S - thermocouple sensitivity;

the initial temperature of thermorestans

15 cL is the temperature coefficient of the co-current of the thermistor material.

The drawing consists of: d - the structure of the surface thermal converter;

Claims (2)

B - temperature distribution in the thermal system of the object. Control-thermocouple-environment; B is an electrical diagram of a thermogfeater (c). The superconnect unit consists of # 9 tesh1Oiol 1show of the 1st corpus of one of them, on the one hand, of the two cores of the sensitive element-thermoreeistor 4 and of the differential thermocouple, of the spa, volume 3, the main part of the sensitive thermoreeistor 4, and the differential thermocouple, of the spa, volume 3, the main part of the sensitive thermoreeistor 4, and the differential thermocouple, the peak of the 3, the main part of the sensitive thermoreeistor 4 and the differential thermocouple, the peak of the 3, the main part of the sensitive thermoreeistor 4, and the differential thermocouple, of the spa points (A and B) .. On the traffic illustrating the pacifperal separation of temperatures, the following symbols are used: t | c is the temperature of the co-controlled object; t is the temperature of the external environment surrounding the thermal converter; temperature difference per tonne of seascape; average temperature of thermal resist; At is the error in the thermostat. On the electrical circuit, a thermopile with resistance R is a sensitive element of the monoflower and is connected to a common differential thermocouple thermocouple with a hot junction A and B. A current E flows through the circuit. Surface thermformer works as follows. When the current flows through the thermistor, the voltage drops to L R. At the same time, two opposing thermal electromotions U and E developed by the thermometers A and B act in the electric circuit. Thus, the general propagation of the circuit 1 is the following relation: U JvR4E -Ee: (ottj.p) tSM5. Since, -At and U "3Ro (; 14ctij,; - 3-R dlut + aSut) To make the result of the measurement of the surface temperature not distorted by the error e, we fulfill the condition aRociA-b cLSdt, the current flowing through the circuit is -og" o Thus, the measurement result of the atura rate exactly corresponds to its actual value. Thus, the proposed invention improves the accuracy of measuring the surface temperature of an object in the static and dynamic modes, speed, and simplifies the thermoelectric agent creep. The designer was experimentally tested in the temperature range of 2O-1OO C in a mock-up sample, the thermistor of which was made of p-type crystalline germanium, and the differential thermocouple was formed by thermocouples manufactured by it. , by the appropriate value of the measuring current. Formula of the invention The surface% 1st thermoformed form contains sequentially connected thermfezist (and a thermocouple, about chayuschiys and in that, in order to increase the accuracy, speed and simplicity kc yutruktsii thermocouple vsholnena diff entsialnoy and its common electrode is formed as a thermistor, and the parameters of the differential thermocouple termsfeaistora communication sootnaaeniem Zan (where D - measuring SOK termoprebrazovatel; S - thermocouple sensitivity; RQ is the initial resistance of the seamaster; сС - temperature coefficient of 1TOTE of thermistor material. Sources of information (fmaai, ingi ing into account during the examination 1.N.Yaryshev. Theoretical bases for measuring non-stationary temperatures. L., Energii, 1967, p. 239-241. 2. USSR author's certificate number 284359, cl. q O1 K 7/16, 1968. (y) type). h “A Ls uiMeffumMbffyw scheme 8 measuring circuit