JPH059627Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention relates to a heating part metal thermometer that aims to reduce measurement errors by easily calibrating the measured temperature and making the calibration value small, while also extending the life of the thermometer.

[Prior Art] Figures 3 and 4 show an example of a conventional heating part metal thermometer, in which a protective member b, which is a tubular material cut in half, is welded to the outer surface of the heating part metal a in the longitudinal direction. One end of the protective member b is closed by welding, and a thermometer c is inserted from the other end.

[Problems to be solved by the invention] However, in the conventional method described above, since the protective member b has a shape that locally protrudes from the outer surface of the heating part metal a, the heat receiving area is large and the cooling area is small. Since the is small, heat is accumulated in the protective member b,
In particular, the area near the tip of the protective member b is easily affected by heat due to sudden changes in shape, resulting in damage due to thermal fatigue. Since the ends of the protective member b are close to each other, the heat receiving area at the ends is large, and the thermometer c
The temperature-sensing part d becomes sensitive to changes in ambient temperature, and even if the temperature change at the center of the true thickness of the heating part metal a is small, the measured value at the temperature-sensing part d becomes large. Furthermore, as described above, the shape of the tip of the protective member b, which is provided in such a shape that the outer surface of the heating part metal a changes abruptly, increases the error in the measured temperature. When correcting to the true heating part thickness center metal temperature,
There are problems such as the method of calibration cannot be elucidated unless various complicated and difficult experiments or heat conduction analysis using a three-dimensional model are performed.

In view of the above-mentioned circumstances, the present invention reduces the heat-receiving area, increases the cooling area, and makes the tip a gentle shape, thereby preventing damage due to thermal fatigue, and measuring temperature with small calibration values and small errors. The object of this invention is to provide a heating section metal thermometer that allows easy calibration of the measured temperature.

[Means for Solving the Problems] The present invention forms a groove on the outer surface of the heating part metal with protrusions that protrude outward in parallel at a required interval, and covers the outer side and one end of the groove. A protective cover is provided therein to form an insertion space for the thermometer to constitute an insertion protrusion having a substantially trapezoidal cross section, and the outer surface and tip of the insertion protrusion are formed with gentle slopes, and the insertion protrusion is inserted into the insertion space. A tip heat effect reduction block is provided at the tip of the temperature sensing section of the thermometer, and a space is provided between the terminal end of the insertion space and the tip heat effect reduction block.

[Function] Therefore, in the present invention, since the insertion protrusion having a gentle slope is formed on the outer surface of the heating part metal, the heat receiving area near the insertion protrusion is reduced, the cooling area is also increased, and the tip The gentle shape of the part prevents damage to the heating part metal due to thermal fatigue, and also prevents damage to the space between the end of the insertion space and the tip heat effect reduction block installed at the tip of the thermometer's temperature sensing part. Due to the inserted heat insulating material and the tip heat effect reduction block, the heat receiving area of the tip is different from that of the general part and even if it is made large, the temperature sensitive part becomes insensitive to sudden changes in ambient temperature, resulting in a small calibration value and a measurement temperature with small measurement error. Furthermore, by making the temperature sensing part less susceptible to heat effects at the tip, the calibration elements for the measured temperature are simplified, and calibration can be easily performed by heat conduction analysis using a three-dimensional model. .

[Example] Hereinafter, an example of the present invention will be described based on the accompanying drawings.

Figures 1 and 2 are an embodiment of the present invention,
Protrusions 2, 2' are provided at predetermined positions on the outer periphery of the heating part metal 1, protruding outward so as to increase the thickness of the heating part metal 1, and extending parallel to the longitudinal direction of the heating part metal 1 with a required interval. By providing this, a groove 3 having the required width and depth and a bottom having a U-shaped cross section is provided. From the open end 3b side of the groove 3, the tip temperature sensing portion 5a and the tip heat effect reduction block 5b (for example, a metal piece made of heat-resistant steel such as SUS) having a required length are connected (for example, by welding). Insert the thermometer 5 toward the end portion 3a, and insert the thermometer 5 between the end surface of the groove 3 and the tip heat effect reduction block 5b.
An appropriate space 4 is provided. Further, the upper part of the groove 3 is covered with a protective cover 6 having a width and side surfaces matching the width of the groove 3 so that the protective cover 6 does not come into direct contact with the thermometer 5 or the tip heat effect reduction block 5b. As a result, an insertion protrusion 8 having a substantially trapezoidal cross section and an insertion space 7 is formed, and the outer surface of the insertion protrusion 8 is formed with a smoothly continuous slope (curve). Further, the thermometer 5 is welded and connected to the heating part metal 1 in the tip heat effect reduction block 5b, and the temperature sensing part 5
It is configured to detect the temperature at point a. The groove 3 can be easily formed by integrally forming a trapezoidal protrusion on the outer periphery of the heating part metal 1 (by pultrusion molding, etc.) in advance, and then cutting a groove in the trapezoidal protrusion or performing a drawing process on the trapezoidal protrusion all at once. can do.

In the heating part metal thermometer constructed as described above, the insertion protrusion 8 provided on the outer surface of the heating part metal 1 is surrounded by a gentle slope, so the heat receiving area is reduced compared to conventional ones. The cooling area increases and the smooth shape of the tip reduces local heat effects, so the thermometer and heating part metal 1
It is possible to prevent damage caused by thermal fatigue. Further, the thermometer 5 inserted into the terminal end of the groove 3 and the groove 3 is inserted into the insertion protrusion with a space provided between the temperature sensing part 5a, the tip heat effect reduction block 5b connected thereto, and the protective cover 6. 8 The inner surface and the end portion 3a are coated so as not to come into contact with each other, improving the heat insulation effect and reducing the influence of heat conduction from the tip, so the temperature of the heating part metal 1 is less susceptible to the influence of the end portion 3a. , the measurement error is small and accurate, and the method for calibrating the temperature measurement value can be easily clarified by a simple two-dimensional temperature distribution analysis.

It should be noted that the heating part metal thermometer of the present invention is not limited to the above-mentioned embodiment, and that a heat insulating material may be provided in the space 4, and various other modifications may be made without departing from the gist of the present invention. Of course, modifications can be made.

[Effects of the invention] As explained above, according to the heating part metal thermometer of the invention, damage to the thermometer and heating part metal due to thermal fatigue can be prevented, measurement temperatures with small calibration values can be obtained, and measurement errors are also small. Therefore, various excellent effects can be achieved, such as the method of calibrating the measured temperature can be easily clarified.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of an embodiment of the heating part metal thermometer of the present invention, Fig. 2 is a view taken in the - arrow direction of Fig. 1, and Fig. 3 is an explanatory diagram of an example of a conventional heating part metal thermometer. FIG. 4 is a view taken along the - arrow in FIG. In the figure, 1 is the heating part metal, 2 and 2' are the protrusions, and 3
4 is a groove, 4 is a space, 5 is a thermometer, 5a is a tip temperature sensing part, 5b is a tip heat effect reduction block, 6 is a protective cover, 7 is an insertion space, and 8 is an insertion protrusion.

Claims (1)

[Scope of utility model registration request] A groove is formed on the outer surface of the heating part metal by protrusions projecting parallel to the outside at a required interval, and a protective cover is provided that covers the outer side and one end of the groove to form a space for inserting a thermometer inside. The insertion protrusion is provided with a substantially trapezoidal cross section, and the outer surface and tip of the insertion protrusion are formed with a gentle slope, and a tip heat effect reduction block is provided at the tip of the thermometer temperature sensing part inserted into the insertion space. A heating part metal thermometer characterized in that a space is provided between the terminal end of the insertion space and the tip heat effect reduction block.