KR19980016273U - Optical pyrometer and thermocouple combined calibration tube - Google Patents

Abstract

This design makes it possible to calibrate, inspect, and measure thermocouples, resistance thermometers, and optical pyrometers in a wide temperature range of 250 ° C to 1,550 ° C, eliminating the need for furnaces, and minimizing temperature deviations to ensure accurate operation. The present invention relates to an optical pyrometer and a thermocouple combined calibration tube which can be made and improved to enable a large amount of work in a short time.

The present invention has a cylindrical body positioned inwardly of the heating means, and both sides of the body are formed with a cylindrical hole forming a straight line in the opposite direction to each other, the inside of the hole is a conical curved surface, A bidirectional calibration tube in which a hole into which a reference thermometer is inserted is formed at the central upper side of the body; The heat dissipation tube has a cylindrical shape in which both holes of the straight pipe are fitted, and includes a heat dissipating tube in which the thermometers to be calibrated are inserted in opposite directions. It is formed inside to form a black body furnace, and provides an optical pyrometer and thermocouple combined calibration tube that minimizes the temperature deviation in the longitudinal direction by symmetrically arranging the heat dissipation tube.

Description

Calibration plate for both optical pyrometer and thermocouple.

The present invention relates to a device used to calibrate, inspect, and measure a thermometer that can be measured from room temperature to high temperature, and more specifically, to calibrate all thermocouples, resistance thermometers, and optical pyrometers in a wide temperature range of 250 ° C to 1,550 ° C. It is possible to inspect, measure, and eliminate the need for several furnaces, and to minimize the temperature deviation, accurate work can be achieved, and it is related to an improved optical pyrometer and thermocouple calibrated tube to enable a large amount of work in a short time.

In general, at each site of the steel mill, various thermometers are used to measure the temperature of the hot body. These thermometers include thermocouples used at relatively low and medium temperatures (−100 ° C. to 650 ° C.), and optical pyrometers (radiation thermometers, infrared thermometers, etc.) used at high temperatures (above 650 ° C.). However, if these thermometers are intended to be used in the field, the products have been inspected in advance to ensure that they are correctly calibrated, and the preliminary inspection was the same as those shown in FIGS.

The conventional thermometer inspection, calibration, and measurement shown in FIG. 1 is intended for thermocouples and resistance thermometers of low and medium temperature distributions, which include an electric resistance coil 110 in a case 100 made of a refractory brick. Is mounted to form an electric furnace, the inner side of the electrical resistance coil 110 is provided with a cylindrical tube 120, the tube 120 is a standard thermocouple 122, which is a reference for temperature measurement, and actually in the field The calibration thermocouples 125 to be used are inserted together and connected to the recorder 130 via respective wires. In this conventional device, the electric resistance coil 110 generates heat to heat the inside of the tube 120, and the two thermocouples 122 and 125 detect temperature rises, respectively. The determination is to calibrate the calibration thermocouple 125 in accordance with the standard thermocouple 122.

In addition, the black body furnace calibration and inspection apparatus 150 shown in FIG. 2 is equipped with a heating coil 110 inside the case 100 made of a refractory brick, and a cylinder inside the heating coil 110. Tube 120 is mounted to form a black body furnace, which forms a vertex black body and a continuous black body path, and toward the inside of the black body, the reference light pyrometer 152 and the calibration light The pyrometer 155 is disposed horizontally, and in the case of a vertex black body, a metal with a very high purity is filled therein to melt the metal and then rapidly cool the metal to reach a solidified state. Since the phase transformation is performed at the same temperature, for example, silver (Ag): 961.92 ° C, gold: 1064,43 ° C, aluminum: 660.46 ° C, antimony: 630.75 ° C, etc. The inspection work is done.

On the contrary, the continuous black body uses graphite or heat resistant steel and has a wide temperature range, and is mainly used in radiation thermometers and infrared thermometers, and the accuracy is inferior to that of the vertex black body furnace. However, due to the wide temperature range and the economics of cost, the industry uses this method a lot.

However, in the conventional method as described above, the electric furnace is highly accurate and stable temperature measurement is possible, but the heat resistance of the material used is only available in a limited temperature, when measuring a thermometer with a wide temperature range by temperature You have to have an electric furnace with a different temperature distribution. In addition, when using a black body furnace, the temperature range is wide, it is convenient to use, but the accuracy is inferior, and depending on the characteristics of the thermometer, there are inconveniences of using various types of black body furnaces having different emissivity, temperature range, and accuracy. will be.

In addition, electric furnace and black body furnace are divided into low temperature, middle temperature, and high temperature according to the temperature range, and many industrial furnaces such as steelmaking processes that require the use of various thermometers have many kinds of furnaces, which make management difficult. will be. In addition, the conventional method as shown in FIG. 1 and FIG. 2 is limited to one or two quantities that can be calibrated and inspected at a time, so that a long time is required when a large amount of thermometer is to be inspected. Work productivity was also deteriorated.

The present invention is to solve the conventional problems as described above, the purpose is to calibrate, inspect, and measure all of the thermocouple, resistance thermometer, and optical pyrometer in a wide temperature range of 250 ℃ to 1,550 ℃ The purpose of the present invention is to provide an improved optical pyrometer and thermocouple calibration tube that can be accurately operated by minimizing a furnace and minimizing temperature deviation.

1 is a state diagram of the use of the calibration tube according to the prior art for the calibration of the thermocouple on the electric furnace,

Figure 2 is a state diagram for use of another calibration tube according to the prior art for calibrating the radiation thermometer on the black body furnace,

Figure 3 is a block diagram showing an optical pyrometer and thermocouple combined calibration tube according to the present invention,

Figure 4 is a cross-sectional view showing the state of use of the optical pyrometer and thermocouple combined calibration tube according to the present invention when a plurality of thermocouples to be corrected,

5 is a cross-sectional view showing a state of use of the optical pyrometer and thermocouple combined calibration tube according to the present invention, when a plurality of optical pyrometers are calibrated,

Figure 6 is a block diagram for explaining the temperature distribution state of the optical pyrometer and thermocouple combined calibration tube according to the present invention.

Explanation of symbols on the main parts of the drawings

5 .... heating means

14 .... Holes 16 .... Surfaces

20,20 '.... heat dissipation tube 30 .... calibration thermocouple

32 .... Reference thermocouple p1, p2 .... Point of emissivity of 1

100 ... case

In order to achieve the above object, the present invention is equipped with a case made of refractory bricks, provided with a heating means therein, by positioning a thermometer that can be measured from room temperature to high temperature inside the heating means to correct and check the temperature In the apparatus used for measuring, having a cylindrical body located inward of the heating means, both sides of the body is formed with a cylindrical hole in a straight line in the opposite direction to each other, the inner side of the hole is conical A curved surface of the bidirectional calibration tube formed with a hole into which the reference thermometer is inserted into the central upper side of the body; The emissivity of the amount of heat applied to the calibration tube by the heating means is 1, including a heat dissipation tube having a cylindrical shape fitted to both holes of the calibration tube, and a thermometer to be calibrated therein. By forming in the heat dissipation tube to form a black body path, by symmetrically arranging the heat dissipation tube to minimize the temperature deviation in the longitudinal direction by providing an optical thermometer and thermocouple combined calibration tube.

Hereinafter, the present invention will be described in more detail with reference to the drawings.

The optical high temperature and thermocouple combined calibration tube 1 according to the present invention has a case 100 made of a refractory brick and a heating means 5 therein, as shown in FIGS. 3 to 5. In order to calibrate and inspect the temperature by measuring a thermometer from room temperature to high temperature inside the heating means (5), bidirectional calibration with a cylindrical body (12) inside the heating means (5) A cylindrical hole 14 having a sphere 10 and forming straight lines in opposite directions on both sides of the body 12 of the orthodontic appliance 10 is formed.

In addition, a conical curved surface 16 is formed inside the hole 14, and the conical curved surface 16 has an amount of heat applied by the heating means 5 formed inside the curved surface 16. At one point P1, the emissivity is formed to be close to one. Therefore, when the heat dissipation tube 20, which will be described later, is inserted into the hole 14, the orthodontic tool 10 constitutes a black body passage in the inner side of each tube 20.

In addition, the central upper side of the body 12 is formed with a hole 22 into which the reference thermometer is inserted, which is formed with a circular vertical hole 24 extending below the center line of the body 12, At the upper side of the vertical hole 24, a guide tool 26 having an inner diameter extended to a conical shape is formed. Therefore, a point having an emissivity of the amount of heat applied to the corrector 10 by the heating means 5 is formed at the center line of the vertical hole 24.

In addition, a straight cylindrical heat dissipation tube 20 is mounted at both sides 14 of the straightener 10, and the heat dissipation tube 20 has a plurality of thermometers to be calibrated therein. It has a structure. Here, the thermometer inserted into the heat dissipation tube 20 may be a thermocouple 30 or a resistance thermometer which is a temperature distribution from low temperature to medium temperature, or may be an optical pyrometer 40 capable of measuring high temperature. will be. In addition, the heat dissipation tube 20 may be one side open type tube 20 having one side end blocked according to the type of the thermometer (see FIG. 4), or both side open type tube 20 'having both ends open. It may also be (see Figure 5).

When the optical pyrometer and thermocouple combined calibration tube 1 of the present invention configured as described above is intended to calibrate a thermometer of a low temperature distribution such as a thermocouple 30 and the like, as shown in FIG. ) Is fixed to both sides of the two-way calibration tool 10, it is located inside the heating means 5 of the case 100, so that the open end of the heat dissipation tube 20 is located to both sides of the case 100 will be. In addition, a reference thermocouple 32 is mounted to the central hole 22 of the body 12 so that the lower end thereof is fixed at a point p2 having an emissivity of 1, which is the center point of the body 12, and to be corrected. A plurality of thermocouples 30 are mounted in the longitudinal direction of the heat dissipation tube 120 so that the tip portion is positioned at a point p1 having an emissivity of 1, and then connected to a recorder (not shown). In this state, heat is applied to the calibration tool 10 and the heat dissipation tube 20 by the heating means 5, and if the heating means 5 is an electric resistance heating coil, power is supplied to the reference thermocouple 32. ) And correct the calibration thermocouple 30 by comparing the measured values obtained from the calibration thermocouple 30.

On the other hand, in the case where the thermometer to be calibrated above is an optical pyrometer 40, such as a radiation thermometer such as a high temperature temperature distribution region, as shown in FIG. Fixing to both sides of the (10), respectively, the two-way calibration tool 10 and the heat dissipation tube (20 ') coupled to it is located inside the heating means (5) of the case 100, one side of the heat dissipation tube (20') The ends are respectively arranged to contact the conical curved surface 16 of the bidirectional corrector 10, and the open ends of the other side are positioned to both sides of the case 100. In addition, a reference thermocouple 32 is mounted to the central hole 22 of the body 12 so that the lower end thereof is fixed at a point p2 having an emissivity of 1 as a center point of the body 12 and to be corrected. A plurality of radiation thermometer 40 is disposed in the longitudinal direction of the heat dissipation tube 20 'and connected to a recorder (not shown). In addition, the focus of the radiation thermometer 40 is calibrated by the heating means 5 in a state in which the focus is set to coincide with the point p1 having an emissivity formed inside the conical curved surface 16 of the bidirectional corrector 10. Heat is applied to the sphere 10 and the heat dissipation tube 20 ', and the calibration radiation thermometer 40 is corrected by comparing the measured values obtained from the reference thermocouple 32 and the calibration thermometer 40.

In this case, the optical pyrometer and thermocouple calibration tube 1 according to the present invention may move away from the temperature measurement point p2 based on the temperature measurement point p2 of the reference thermocouple 32, as shown in FIG. As the temperature error occurs, the temperature error is symmetrical with distance. The heat dissipation tubes 20 and 20 'are symmetrical structures with respect to the bidirectional corrector 10, thereby making it possible to uniformize the temperature deviation for each distance. Therefore, stable and accurate temperature measurement of the calibration thermometer 30, 40 is possible and can be compared.

As described above, according to the present invention, the bidirectional calibration tool 10 and the heat dissipation tube 20, 20 'each play the same role as the black body furnace, and the optical pyrometer as one black body furnace (radiation thermometer, infrared thermometer). , Thermocouples and resistance thermometers can be calibrated at the same time. In addition, in order to calibrate an optical pyrometer, a thermocouple, a resistance thermometer, etc., an effect of not having to have different types of furnaces such as an electric furnace or a gutter furnace is obtained. In addition, it is possible to compare the accuracy of high temperature measurement, shorten the temperature rise time, compare the thermocouple and the advertising thermometer, compare the thermocouple and the resistance thermometer, and measure the comparison between the photometer and the resistance thermometer. An improved effect is obtained which makes it possible to compare simultaneously.

Claims (1)

It is provided with a case 100 made of a refractory brick, having a heating means 5 therein, and placing a thermometer that can be measured from room temperature to high temperature inside the heating means 5 to calibrate, inspect, and measure the temperature. In the apparatus used, it is provided with a cylindrical body 12 positioned inwardly of the heating means 5, and on both sides of the body 12 are formed cylindrical holes 14 which are in a straight line in opposite directions. A bidirectional corrector 10 having a conical curved surface 16 formed inside the hole 14, and a hole into which a reference thermometer is inserted into a central upper side of the body 12; The heating means (5) comprises a heat dissipation tube (20, 20 ') is formed in a cylindrical shape fitted to both holes 14 of the orthodontic tool (10), and the thermometers to be calibrated are inserted in opposite directions. Point (p1) (p2) of the emissivity of the amount of heat applied to the orthodontic tool 10 and the heat dissipation tube (20) (20 ') by 1) is formed in the heat dissipation tube (20) (20') to the black body. Forming, and the heat radiation tube (20) (20 ') by symmetrically arranged to minimize the temperature deviation in the longitudinal direction, characterized in that the optical pyrometer and thermocouple combined calibration plate.