JPS60244825A - Temperature measuring sensor - Google Patents

Abstract

PURPOSE:To prevent burning and characteristic deterioration due to heating by welding a guide wire to the tip of the sheath of the temperature measuring sensor and storing a heat-sensitive part in the sheath at distance from the tip across an insulator. CONSTITUTION:A temperature sensing element 4 has the guide wire 5 welded to the tip of the sheath 1. Further, the heat-sensitive part 3 is provided in the sheath 1 across the insulator 2. The heat-sensitive part 3 is provided behind the tip of the sheath 1 at constant distance S to prevent deterioration due to the welding. A groove 12 is formed in the direction of the outer peripheral axis of a tube material 11. The temperature sensing element 4 and guide wire 5 are put in the groove 12 and fixed with a band 13. The temperature sensing element 4 and guide wire 5 are thermally sprayed with metalli powder at low temperature and united with the tube material 1.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a temperature sensor comprising a sheath-type temperature measuring body in which a heat sensing portion is housed with an insulator interposed within the sheath.

``Prior Art'' A conventional temperature sensor of this type is shown in FIG. 6, and is mounted in the axial direction on the outer peripheral surface of a tube. That is, the thermocouple wire 103 is housed in the sheath 101 with an inorganic insulator 102 such as magnesium oxide MgO interposed therein,
The sheath 10 is placed at the end of the thermometer 104.
1 is closed by welding 105, and this sheath 101
is fixed to the pipe material by welding. The distance S between the weld 105 and the heat sensitive part 104 is small, and the outer peripheral surface of the sheath 101 is also welded and heated to a high temperature of 1,200°C or more during welding, so the sheath 101 may be damaged or the heat sensitive part 104 may be damaged.
There is a risk that the temperature may deteriorate and affect the temperature measurement characteristics. Also,
7 and 8 show examples in which this type of temperature sensor is attached to the circumferential direction of the outer circumferential surface of a tube. That is, an annular groove 108 is carved in the pipe material 106,
The sheath 101 is buried in the groove 108, and then
There is one in which a presser member 109 is fitted into the groove, and the presser member 109 and the edge of the groove 108 are fixed by welding 110. This may cause the sheath 101 to burn out due to high temperature heating, resulting in deterioration of the characteristics of the thermocouple.
01, which may cause a large error in temperature measurement, and furthermore, deterioration due to high-temperature heating may lead to disconnection during use.

``Problems to be Solved by the Invention'' The present invention prevents burnout of components or deterioration of temperature measurement characteristics by heating the temperature measurement element by welding the temperature measurement object to the member, and furthermore, The temperature measuring element is placed precisely at the point to be measured, and the temperature measuring element is brought into close contact with the temperature measuring point to enable accurate temperature measurement.

``Means for Solving the Problems'' The present invention connects a guide wire by welding to the tip of a temperature sensing element that houses a heat sensing part with an insulator interposed in the sheath, and connects the heat sensing part to the tip of the temperature sensing element. In addition, the above-mentioned temperature sensor is placed at a distance necessary to avoid high temperatures when connected by welding, and a groove is carved in the member to be measured, and the temperature sensor is and the guide wire is fitted into the groove, and the band that presses the temperature measuring element and the guide wire is fixed to the member,
The thermal sprayed metal is embedded in the groove in which the temperature sensing element and the guide wire are fitted by thermal spraying using metal powder made of the same material or approximately the same material as the member at a low temperature or at a temperature that does not cause thermal deterioration of the temperature sensor.

``Example'' In Figure 1, magnesium oxide MgO is placed inside the sheath 1.
A thermocouple or a temperature measuring resistor, such as a metal resistor, a thermistor, etc., or a heat sensitive part 3 of an electronic element is housed with an inorganic insulator 2 such as the like interposed therebetween, and the opening of the sheath 1 is closed by welding to measure the temperature. Form body 4. A guide wire 5 such as a welding rod is connected to the tip of the temperature measuring element 4 by welding. The heat sensitive part 3 is a temperature sensor located at a distance *S required to avoid high temperatures when connected by welding from the tip of the temperature measuring element 4.

FIGS. 2 and 3 show an example in which the temperature sensor is mounted on the outer circumferential surface of the tube in the axial direction. First, a V-shaped groove 12 as shown in FIG. 2 is cut to a predetermined length in the axial direction of the outer peripheral surface of the tube material 11. As shown in FIG. The temperature measuring element 4 and the guide wire 5 are placed in this groove 12.
The temperature measuring element 1 and the guide wire 5 are pressed perpendicularly by the band 13 made of a heat-resistant metal plate, and the band 13 is temporarily attached to the tube material 11 by spot welding. Next, the temperature measuring element 4
・Slide the guide wire 5 to position the heat sensitive part 3 in the center of the groove 12 to a temperature that does not cause thermal deterioration of the temperature sensor by metal powder made of the same material or almost the same material as the tube material 11, for example 100
Thermal sprayed metal 14 is embedded in the groove 12 in which the temperature sensing element 4 and the guide wire 5 are fitted by low-temperature spraying at a temperature of about ~150°C to an extent slightly above the surface of the tube 11, and finished to be the same as the surface of the tube 11. The temperature measuring element 4 led out at the end of the sprayed metal 14 is connected to the boss fitting 15 and the reinforcing pipe 1.
After passing through the inside of the tube 6 and leading it out, the lead-out boss metal fitting 15 is fixed to the surface of the pipe material 11 by welding 17. FIGS. 4 and 5 show an example in which a groove is cut in the circumferential direction of the tube material 11, and a temperature sensor is attached to the groove. V-shaped groove 2 as shown in Figure 4
1 so that the thermal contact point 3 of the thermometer 4 is along the bottom of the groove, and the guide wire 5 is wrapped around the guide wire 5 about 4 times, and the temperature detector 4 and the guide wire 5 are pressed perpendicularly with the band 22 to spot it on the tube material 11. Temporarily fixed by welding, and by pulling the tip of the guide wire 5, the temperature sensing element 4 is brought into close contact with the bottom of the groove, and when it comes out of the band 22, the guide wire 5 is bent into a small size and the excess guide wire 5 is cut off. Metal powder made of the same material or approximately the same material as the tube material 11 is sprayed into the groove 21 in which the temperature sensor 4 and the guide wire 5 are fitted by thermal spraying at a low temperature or at a temperature that does not cause thermal deterioration of the temperature sensor.
21 is coated with thermal sprayed metal 23 to an extent that slightly exceeds the pipe diameter, and then finished to be the same as the surface of the pipe material 11. The temperature measuring element 4 is inserted through the lead-out boss metal fitting 24 and the reinforcing pipe 25 and led out to the outside, and the lead-out boss metal fitting 24 is welded to the surface of the pipe material 11 at a position slightly apart from the sprayed metal 23.
It is fixed by 6.

"Effects of the Present Invention" According to the present invention, the thermal junction housed in the thermometer is set at a position away from the open end of the sheath to the extent that it is not affected by the high temperature during welding, and the guide wire is Since the sheath is attached to the component to be measured, there is no chance of burnout of the sheath, and furthermore, there is no thermal deterioration of the temperature sensing part, which does not affect the temperature measurement characteristics, allowing for highly accurate measurements. .

Furthermore, the mounting of the temperature measuring element is not subjected to high temperature heating during welding as in conventional methods, and since the thermal spraying temperature is sufficiently low, for example, 100 to 150° C., thermal deterioration does not occur. By spraying and attaching metal powder made of the same material or almost the same material as the member to be measured, there is no risk of cracking or peeling due to the difference in thermal expansion between the metals. Since the thermal spray coating is made of fine metal powder, no voids are created on the mounting surface of the temperature sensing element, which eliminates measurement errors. Since the temperature sensor is installed by thermal spraying that does not cause thermal deterioration, even a thin wire temperature sensor can be installed without burning out. Since the mounting part of the temperature sensor does not protrude from the surface of the member to be measured, there is no effect of heat radiation. Furthermore, the accuracy of temperature measurement is improved because there is no high temperature degradation or voids.

[Brief explanation of the drawing]

Fig. 1 is a front view of the temperature sensor of the present invention, Fig. 2 is a side view of an example in which the temperature sensor shown in Fig. 1 is attached in the axial direction of a pipe member, and Fig. 3 is a side view of the temperature sensor of Fig. Figure 4 is a front view of an example in which the temperature sensor shown in Figure 1 is installed in a groove in the circumferential direction of a pipe member, Figure 5 is a sectional view of Figure 4, and Figure 6 is a conventional FIG. 7 is a front view of the temperature sensor attached to a circumferential groove of a conventional tube member, and FIG. 8 is a cross-sectional view of FIG. 7. 1... Sheath 2... Insulator 3... Heat sensitive part 4... Temperature sensing element 5... Guide wire 11... Member 12, 21... Groove 13, 22...・Band 14/23...Thermal spray metal applicant Okazaki Seisakusho Co., Ltd. Agent Yoshiteru Takagi Figure 1 Figure 6 Procedures? Ho Zheng Shu (spontaneous)! r 1, Indication of the case 1981 Patent application No. (02334 No. 2, Name of the invention Temperature sensor 3, Person making the amendment Relationship to the case Patent applicant address 3-1-3 Miyukidori, Chuo-ku, Kobe City Name: Okazaki Seisakusho Co., Ltd. Representative: Yu Okazaki 4, Agent address: 1-23-26 Edobori, Nishi-ku, Osaka City Detailed description of the invention in the specification

Claims (1)

[Claims] (Necessary to connect the guide wire by welding to the tip of the temperature sensing element that houses the heat sensing part with an insulator interposed in the sheath, and to avoid high temperatures when connecting the heat sensing part from the tip of the temperature sensing element by welding.) Temperature sensor (2) characterized in that it is located at a location a distance away from the temperature sensor (2) A temperature sensor in which a groove is carved in the member to be measured, and a heat-sensitive part is housed with an insulator interposed within the sheath. The temperature measuring body with a guide wire connected to the tip of the body by welding and the guide wire are fitted into the groove, the band pressing the temperature measuring body and the guide wire is fixed to the member, and a metal made of the same material or almost the same material as the member is attached. Temperature sensor made of low-temperature powder or thermal sprayed metal at a temperature that does not cause thermal deterioration of the temperature sensor and embedded in a groove in which the temperature sensor and guide wire are fitted.