RU136161U1 - DEVICE FOR MEASURING SOLID SURFACE TEMPERATURE - Google Patents

Abstract

A device for measuring the temperature of a solid surface, containing a measuring circuit connected via an analog-to-digital converter with an electronic computer, characterized in that it is equipped with a block of thermocouples with electrical leads, a heat-conducting plate, a radiator with a fan, while the block of thermocouples has an upper and lower surfaces that contact respectively with a radiator blown by a fan, and with a heat-conducting plate in contact with a solid surface, and electric The thermal terminals of the thermocouple block are connected to the measuring circuit.

Description

The utility model relates to measuring technique and can be used to measure the temperature of a solid surface.

Known thermoelectric transducer for measuring the surface temperature of solids containing a cable thermocouple as a thermosensitive element placed in the case so that the working and free ends of the thermocouple are outside the case, while the thermocouple is located in the case with axial movement relative to the latter and from the free side the end is kinematically connected to it by means of a spring, and on the side of the working end the thermocouple is equipped with a stop for attaching the thermocouple inside the case and the value of the output of the working end of the thermocouple from the cover (patent RU No. 72757, IPC G01K 7/00, 04/07/2008).

The closest technical solution is a device for measuring the temperature of the working fluid containing a measuring circuit connected via an analog-to-digital converter with an electronic computer, as well as a contact temperature sensor (patent RU No. 119877, IPC G01K 7/00, 08/22/2011).

The disadvantages of the known device are low accuracy and low measurement sensitivity.

The objective of the utility model is to increase the accuracy and sensitivity of measurements.

The technical result is achieved by the fact that the device for measuring the temperature of a solid surface, containing a measuring circuit connected via an analog-to-digital converter with an electronic computer, according to this utility model, is equipped with a thermocouple block with electrical leads, a radiator with a fan, a heat-conducting plate, while the thermocouple block has upper and lower surfaces that contact, respectively, with a radiator, a fan blown over, and with a heat-conducting plastic mud in contact with a solid surface, and the electrical terminals of the thermocouple block are connected to the measurement circuit.

The essence of the utility model is illustrated in the drawing, where figure 1 shows a functional diagram of the proposed device for measuring the temperature of a solid surface.

In figure 1, the numbers denote:

1 - measuring circuit,

2 - analog-to-digital Converter,

3 - electronic computer

4 - printer

5 - block thermocouples,

6 - radiator,

7 - fan

8 is a heat-conducting plate,

9 - fan power supply.

A device for measuring the temperature of a solid surface comprises a measuring circuit 1 connected through an analog-to-digital converter 2 with an electronic computer 3 having a printer 4.

The difference of the proposed device for measuring the temperature of a solid surface is that it is equipped with a block 5 of thermocouples with electrical leads, a radiator 6 with a fan 7, a heat-conducting plate 8. The fan 7 is connected to a power source 9.

Block 5 thermocouples has upper and lower surfaces, which are in contact, respectively, with a radiator 6, blown by a fan 7, and with a heat-conducting plate 8 in contact with a solid surface.

The electrical terminals of the block 5 thermocouples are connected to the measuring circuit 1.

The proposed device improves the accuracy and sensitivity of measuring the temperature of a solid surface by converting the temperature difference into electrical energy using block 5 thermocouples.

Block 5 thermocouples has an upper and lower surface with electrical leads.

The block 5 of the thermocouples is fixed by the lower surface to a heat-conducting plate 8 in contact with the investigated solid surface.

The upper surface of the block 5 thermocouples is connected to a radiator 6 located in the surrounding space and blown by a fan 7.

Block 5 thermocouples attached to the surface of a solid object with a heat-conducting plate 8 using hot melt adhesive.

In the device, one junction (electrical terminal) of block 5 of thermoelements is connected to a heat-conducting plate 8 in contact with the studied solid surface, and the second junction (electric terminal) of block 5 of thermoelements is cooled by a radiator 6, blown by a fan 7, powered by a power supply (IP) 9.

The ammeter A _T and the voltmeter V _T connected to the electrical terminals (junctions) of the thermocouple unit 7 measure the current and voltage of the thermoelectromotive force EMF, the values of which are transmitted to the analog-to-digital converter (ADC) 2, then to the computer 3 and printed by printer 4.

Thus, the proposed device improves the accuracy and sensitivity of measuring the temperature of a solid surface by converting the temperature difference on the block 5 of the thermocouples into electrical thermoEMF with a larger surface area of the solid.

Indeed, for one of the most sensitive chromel-kopel thermocouples at a temperature difference ΔT = 50 K, the thermoEMF is E = 3.11 mV, which corresponds to a relative error of δ = 0.062 mV / 3.11 mV (0.02, or 2%) and the slope of the characteristic (sensitivity) k = 0.062 mV / °. This is consistent with existing industrial hard surface temperature meters, both domestic and foreign.

According to the proposed utility model, for the same temperature difference ΔT = 50 K, thermoelectric power E is on a thermocouple of the TEC-12706 type E = 750 mV at T = 50 ° C. This corresponds to a relative error of δ = 0.8 mV / 750 mV (0.001, or 0.1%) and a slope of the characteristic k = 0.8 mV / °.

Thus, the use of the claimed device can provide a temperature measurement of the investigated solid surface with higher accuracy and sensitivity.

Claims (1)

A device for measuring the temperature of a solid surface containing a measuring circuit connected via an analog-to-digital converter with an electronic computer, characterized in that it is equipped with a block of thermocouples with electrical leads, a heat-conducting plate, a radiator with a fan, while the block of thermocouples has an upper and lower surfaces that contact respectively with a radiator blown by a fan, and with a heat-conducting plate in contact with a solid surface, and electric The thermal terminals of the thermocouple block are connected to the measuring circuit.

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