JP2023095129A - Temperature measuring apparatus - Google Patents

Abstract

To provide a temperature measuring apparatus capable of preventing fall of a first outer protective tube and damage of an inner protective tube body even when exposed to excessive combustion temperature.SOLUTION: In a temperature measuring apparatus, a heat resistant cement layer 5 is provided in a gap s1 of an overlapping portion between a base end portion outer peripheral surface 40 of a first outer protective pipe 4A and an inner peripheral surface 41 of a second outer protective pipe 4B, and a tip surface 50 of the heat resistant cement layer 5 is sealed by a stop ring 6 provided between the base end portion outer peripheral surface 40 of the first outer protective pipe 4A and a tip surface 42 of the second outer protective pipe 4B.SELECTED DRAWING: Figure 2

Description

TECHNICAL FIELD The present invention relates to a temperature measuring device equipped with a thermocouple capable of measuring high temperatures of 1000° C. or higher.

Conventionally, as a temperature measuring device capable of measuring high temperatures of 1000 ° C. or higher, such as a thermometer for coke oven flue, there is a thermocouple, an internal protective tube in which the thermocouple is installed, and the internal protective tube is installed. The inner protective tube or the outer protective tube is made of ceramics (see Patent Documents 1 and 2, for example).

The outer protective tube has a length of 1.5m to 3m and is installed in the combustion chamber. For this reason, the external protective tube includes a first external protective tube on the distal end side, and a proximal end side first external protective tube connected so that the inner peripheral surface on the distal end side overlaps the outer peripheral surface of the proximal end portion of the first external protective tube. A heat-resistant cement layer is provided in the overlapped gap between the base end outer peripheral surface of the first outer protective tube and the inner peripheral surface of the second outer protective tube.

By the way, due to operating conditions and aged deterioration of the furnace body, if even the second outer protective tube on the base end side is exposed to excessive combustion temperature, the heat-resistant cement will peel off or break, and the first outer protective tube on the tip side will be damaged. There are problems that cause falling and damage to the inner protective tube.

JP-A-55-129484 Japanese Utility Model Laid-Open No. 59-27428

Therefore, in view of the above situation, the present invention aims to solve a temperature measuring device that can prevent the first outer protective tube from falling and the inner protective tube from being damaged even when exposed to an excessive combustion temperature. in that it provides

The present invention includes the following inventions.
(1) A temperature measuring device comprising a thermocouple capable of measuring high temperatures of 1000° C. or higher, an inner protective tube housing the thermocouple, and an outer protective tube housing the inner protective tube. The outer protective tube includes a first outer protective tube on the distal end side, and a proximal end side connected so that the inner peripheral surface on the distal end side overlaps the outer peripheral surface of the proximal end portion of the first outer protective tube. and a second outer protective tube, and a heat-resistant cement layer is provided in the gap between the overlapping portion between the outer peripheral surface of the proximal end portion of the first outer protective tube and the inner peripheral surface of the second outer protective tube. The tip surface of the heat-resistant cement layer is sealed by a retaining ring provided between the outer peripheral surface of the base end portion of the first outer protective tube and the tip surface of the second outer protective tube. and temperature measuring device.

(2) The description of (1), wherein the retaining ring is fixed by welding to one of the outer peripheral surface of the proximal end portion of the first outer protective tube and the distal end surface of the second outer protective tube. temperature measuring device.

(3) The stop ring is provided with an annular protruding piece that protrudes toward the proximal end and is inserted into the gap, at the portion on the inner peripheral side that abuts on the outer peripheral surface of the proximal end of the first outer protective tube. , (1) or (2).

(4) A temperature measuring device comprising a thermocouple capable of measuring high temperatures of 1000° C. or higher, an inner protective tube housing the thermocouple, and an outer protective tube housing the inner protective tube. The outer protective tube includes a first outer protective tube on the distal end side, and a proximal end side connected so that the inner peripheral surface on the distal end side overlaps the outer peripheral surface of the proximal end portion of the first outer protective tube. and a second outer protective tube, and a heat-resistant cement layer is provided in the gap between the overlapping portion between the outer peripheral surface of the proximal end portion of the first outer protective tube and the inner peripheral surface of the second outer protective tube. The second outer protective tube is made of metal, and a pair of through holes are provided in the overlapped portion of the first outer protective tube and the second outer protective tube, penetrating the respective tube walls in the radial direction and communicating with each other. and a retainer pin is inserted into each of the through holes, and the head of the retainer pin is fixed to the outer peripheral surface of the second outer protective tube by all-around welding.

(5) The overlapping portion of the first outer protective tube and the second outer protective tube is screwed into a penetrating screw hole drilled in the tube wall of the second outer protective tube, and the tip surface is the first outer protective tube. The temperature measuring device according to (4), wherein the positioning screws abutting on the outer peripheral surface of the pipe are provided at a plurality of positions along the circumferential direction.

(6) The thermocouple is embedded in a rod-shaped insulator, and a support that supports the base end portion of the insulator, the base end portion of the inner protective tube, and the base end of the outer protective tube, respectively. A base is provided, and the base end portion of the internal protective tube is supported by the inner peripheral surface of a cylindrical support portion protruding along the outer peripheral surface of the insulator on the distal end side of the support base ( A temperature measuring device according to any one of 1) to (5).

(7) The temperature measurement device according to (6), wherein the cylindrical support portion has a compression fitting structure that fixes the outer peripheral surface of the base end portion of the inner protective tubular body with a cotter.

(8) The temperature measuring device according to (6) or (7), wherein the supporting base has a compression fitting structure that fixes the outer peripheral surface of the base end portion of the insulator with a cotter.

(9) A metal cylindrical socket for connecting the terminal box is provided on the base end side of the support base, and a metal plate is provided extending from the outer peripheral surface of the cylindrical socket to the terminal box outer peripheral surface on the base end side. , the metal plate and the outer peripheral surface of the cylindrical socket are fixed by welding, and the metal plate and the outer peripheral surface of the terminal box are screwed, (6) to (8). measuring device.

According to the temperature measuring device according to the present invention as described above, the tip surface of the heat-resistant cement layer is provided between the outer peripheral surface of the base end portion of the first outer protective tube and the tip surface of the second outer protective tube. Sealing with the ring prevents the heat-resistant cement from falling and prevents the heat-resistant cement from being exposed to excessive combustion temperature and peeling off or breaking, thereby preventing the fall of the first outer protective tube and the heat-resistant cement. Damage to the internal protective tube can be prevented.

In the case where the stop ring is fixed by welding to one of the outer peripheral surface of the proximal end of the first outer protective tube and the distal end surface of the second outer protective tube, one of which is made of ceramics. The retaining ring can be fixed firmly by welding.

In addition, in the case where the stop ring is provided with an annular protruding piece that protrudes toward the proximal end and is inserted into the gap, at the portion on the inner peripheral side that abuts on the outer peripheral surface of the proximal end of the first outer protective tube, It is possible to more reliably prevent the heat-resistant cement from falling, peeling off, breaking, and the like.

Further, the present invention provides a thermocouple capable of measuring a high temperature of 1000 ° C. or higher, an internal protective tube in which the thermocouple is installed, and an external protective tube in which the internal protective tube is installed. In the measuring device, the outer protective tube includes a first outer protective tube on the distal end side and a base connected such that the inner peripheral surface on the distal end side overlaps the outer peripheral surface of the proximal end portion of the first outer protective tube. and a second outer protective tube on the end side, and a heat-resistant cement layer is formed in the gap of the overlapping portion between the outer peripheral surface of the base end portion of the first outer protective tube and the inner peripheral surface of the second outer protective tube. wherein the second outer protective tube is made of metal, and a pair of communication pipes penetrating radially through each tube wall at the overlapping portion of the first outer protective tube and the second outer protective tube and communicating with each other. Holes are provided, retaining pins are inserted into these through holes, and the head of the retaining pin is fixed to the outer peripheral surface of the second outer protective tube by all-around welding. It also provides equipment. According to this, it is possible to reliably prevent the first outer protective tube from falling even if a difference in thermal expansion occurs, and it is possible to prevent gas from entering through the through hole by welding the pin head all around. .

Here, the overlapping portion of the first outer protective tube and the second outer protective tube is screwed into a penetrating screw hole drilled in the tube wall of the second outer protective tube, and the tip surface is the first outer protective tube. In the case where positioning screws abutting on the outer peripheral surface of the pipe are provided at a plurality of positions along the circumferential direction, both external The protective tubes can be fixed together, and the gap between them can be kept constant so as not to put a burden on the heat-resistant cement layer.

Further, the thermocouple is embedded in a rod-shaped insulator, and a supporting base that supports the base end of the insulator, the base end of the inner protective tube, and the base end of the outer protective tube, respectively. wherein the base end portion of the internal protective tube is supported by the inner peripheral surface of a cylindrical support portion protruding along the outer peripheral surface of the insulator on the distal end side of the support base, Each member can be integrally and stably fixed by the support base, and manufacturing such as assembly is facilitated.

In addition, when the cylindrical support has a compression fitting structure in which the outer peripheral surface of the proximal end of the internal protective tube is fixed with a cotter, the internal protective tube is crimped and fixed so that it does not come off due to vibration or the like. Fixing can be realized, and even when the outer protection tube is damaged, hot air can be prevented from entering and the thermocouple can be protected.

In addition, when the support base has a compression fitting structure in which the outer peripheral surface of the base end portion of the insulator is fixed with a cotter, the insulator of the thermocouple is crimped and fixed, realizing a firm fixation that does not come off due to vibration or the like. can

Further, a metal cylindrical socket for connecting the terminal box is provided on the base end side of the support base, and a metal plate extending from the outer peripheral surface of the cylindrical socket to the terminal box outer peripheral surface on the base end side is provided, When the metal plate and the outer peripheral surface of the cylindrical socket are fixed by welding, and the metal plate and the outer peripheral surface of the terminal box are screwed, loosening of the terminal box due to heat reception and vibration is prevented. can.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory diagram showing the overall configuration of a temperature measuring device according to a representative embodiment of the present invention; Similarly, a vertical cross-sectional view of the temperature measuring device. FIG. 3 is an enlarged cross-sectional view of a main part of the same temperature measuring device; FIG. 3 is an enlarged cross-sectional view of a main part of the same temperature measuring device; Explanatory drawing which shows a compression fitting structure. Explanatory drawing of the principal part which shows the modification of this invention.

Embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

As shown in FIGS. 1 to 3, the temperature measuring device 1 of the present invention includes a thermocouple 2 capable of measuring high temperatures of 1000° C. or higher, an internal protective tube 3 in which the thermocouple is installed, and the internal It has an external protective tube body 4 in which a protective tube body is installed. The external protective tube body 4 is connected to a first external protective tube 4A made of ceramics on the distal end side so that the internal peripheral surface 41 on the distal end side overlaps the outer peripheral surface 40 of the proximal end portion of the first external protective tube 4A. and a second outer protective tube 4B made of metal on the base end side. In this embodiment, an example configured as a temperature measuring device used to measure the temperature of a coke oven will be described, but the present invention is not limited to this, and can be widely applied as a temperature measuring device for measuring high temperatures of 1000 ° C. or higher. .

The distal end portion 44 of the first outer protective tube 4A on the distal end side of the outer protective tube body 4 is sealed, and the gap s2 between the distal end portion 44 and the distal end portion 31 of the inner protective tube body 3 has a buffer Inorganic heat-resistant fibers 17 are interposed for use. A heat-resistant cement layer 5 is provided in the overlapping space s1 between the base end outer peripheral surface 40 of the first outer protective tube 4A and the inner peripheral surface 41 of the second outer protective tube 4B.

In the present invention, as can be seen from the enlarged view in FIG. It is sealed by a stop ring 6 provided between. As a result, the heat-resistant cement of the heat-resistant cement layer is prevented from falling, and the heat-resistant cement is prevented from being exposed to an excessive combustion temperature and being peeled off or destroyed. are configured to prevent damage to the

The stop ring 6 is provided with an annular protruding piece 60 which protrudes toward the proximal end and is inserted into the gap s1 at an inner peripheral portion that abuts against the outer peripheral surface 40 of the proximal end portion of the first outer protective tube 4A. , the base end portion outer peripheral surface 40 of the first outer protective tube 4A and the distal end surface 42 of the second outer protective tube 4B are fixed by welding to one metal member side, that is, the second outer protective tube 4B side in this example. (welded part 12). Welding is preferably all-around welding. By providing the protruding piece 60 inserted into the gap s1, leakage (dropping), peeling, breakage, etc. of the heat-resistant cement can be more reliably prevented.

In addition to such a stop ring 6, in this embodiment, as shown in FIG. Through holes 47 and 48 are provided at three positions rotated 120 degrees about the axis, respectively. are connected so that the first outer protective tube 4A does not drop toward the tip side. The retaining pin 11 has its head fixed to the outer peripheral surface 43 of the second outer protective tube 4B by all-around welding so that gas does not enter through the through holes 47 and 48 (welded portion 15). In this example, the retaining pins 11 are provided at three locations, but the number is not particularly limited.

A reference numeral 46 fixes both outer protective tubes 4A and 4B in a state that the through holes 47 and 48 through which the retaining pin 11 is inserted are positioned to communicate with each other, and applies a load to the heat-resistant cement layer 5. This is a positioning screw for keeping the gap of the gap s1 constant so that it does not occur. This positioning screw 46 is screwed into a through screw hole 49 drilled at three locations rotated by 120 degrees about the tube wall axis of the second outer protective tube 4B, and the tip end face of the first outer protective tube 4A. It abuts on the outer peripheral surface. The head of the positioning screw 46 is fixed by spot welding (welded portion 15A) so as not to loosen due to vibration.

The thermocouple 2 is housed in a rod-shaped insulator 20 having a pair of through-holes into which wires are inserted along the axial direction. ing. A flange 16 for attachment to the equipment side is welded and fixed to the outer peripheral surface 43 of the second outer protective tube 4B on the base end side of the outer protective tube body 4 .

A support base 7 is provided for supporting the base end portion 20b of the insulator 20, the base end portion 3b of the inner protective tube 3, and the base end 4b of the outer protective tube 4, respectively. As shown in FIG. 3, the support base 7 is a cylindrical member provided with a fixing hole 7c in the center thereof, through which the insulator 20 and the base end portion 3b of the internal protective tube 3 are inserted and fixed.

A flange portion 74 is formed on the outer peripheral portion of the support base 7 so as to abut from the proximal end side on the annular convex portion 45 projecting from the inner peripheral surface of the proximal end portion of the second outer protective tube 4B. This flange portion 74 is pressed forward by a distal end face 82 of a cylindrical socket 8 that is screwed into the proximal end portion 4b of the second outer protective tube 4B from the proximal side, thereby forming a support base 7 and the second outer protective tube 4B. 2 The outer protective tube 4B and the cylindrical socket 8 are integrally fixed. A press screw 19 is provided at the proximal end of the second outer protective tube 4B to press the threaded cylindrical socket 8 to prevent it from coming off.

The proximal end portion 3b of the internal protective tube 3 is supported by the inner peripheral surface 71 of a cylindrical support portion 70 protruding along the outer peripheral surface of the insulator 20 on the distal end side of the support base 7 . The cylindrical support part 70 has a compression fitting structure 72 that fixes the outer peripheral surface 30 of the base end 3b of the inner protective tube 3 with a cotter, and is firm enough to prevent the inner protective tube 3 from coming off due to vibration or the like. It is configured to be fixed and to protect the thermocouple 2 by preventing hot air from entering even when the outer protective tube 4 is damaged.

The support base 7 has a second compression fitting structure 73 that fixes the outer peripheral surface of the base end portion 20b of the insulator 20 with a cotter, and is configured to prevent the insulator 20 and the thermocouple 2 from breaking or falling. ing. More specifically, the second compression fitting structure 73 includes, as shown in FIG. 5, the mounting member 4, as also shown in FIG. , a cylindrical cotter 732 having an outer periphery with an inclined surface 735 abutting against a tapered surface 731 formed on the inner peripheral surface of the cylindrical body 730; A cotter 732 is pressed against the tapered surface 731 through a tubular insulator 733 and a tightening tubular cap nut 734 for crimping the insulator 20 to the outer peripheral surface thereof. By interposing an insulator 733 that rotates about the axis relative to the cap nut 734, it is possible to tighten the cotter 732 without applying a load in the rotational direction. The cotters used for the compression fitting structures 72 and 73 are preferably made of hydrated magnesium silicate having heat resistance, for example.

The cylindrical socket 8 has a male threaded portion 83 formed on the base end side for connection with the terminal box 9, and the terminal box 9 is screwed thereon. As shown in FIG. 1, a metal plate 81 is provided extending from the outer peripheral surface 80 of the cylindrical socket 8 to the terminal box outer peripheral surface 90 on the base end side, and the metal plate 81 and the outer peripheral surface 80 of the cylindrical socket 8 are It is welded and fixed (welded portion 13), and the metal plate 81 and the outer peripheral surface 90 of the terminal box are screwed.

The head of the screw 82 is fixed by welding to the outer peripheral surface 90 of the terminal box 9 (welded portion 14). As a result, the terminal box 9 can be prevented from loosening due to heat reception and vibration. As shown in FIG. 6, it is also preferable that the metal plate 81 is extended to the outer peripheral surface of the base end portion of the second outer protective tube 4B and fixed by welding (welded portion 13A). Thereby, loosening can be prevented more firmly.

A connection terminal 91 for connecting a signal line to the terminal box 9 is configured to be fixed with a double nut 18 . As a result, the structure is such that loosening of the signal line due to heat reception and vibration can be prevented.

Although the embodiments of the present invention have been described above, the present invention is by no means limited to such embodiments, and can of course be embodied in various forms without departing from the gist of the present invention.

REFERENCE SIGNS LIST 1 temperature measuring device 2 thermocouple 3 internal protective tube 3b proximal end 4 external protective tube 4A, 4B external protective tube 4b proximal end 5 heat-resistant cement layer 6 stop ring 7 supporting substrate 7c fixing hole 8 cylindrical socket 9 terminal Box 11 Retaining pin 12 Welding part 13 Welding part 13A Welding part 14 Welding part 15 Welding part 15A Welding part 16 Flange 17 Inorganic heat-resistant fiber 18 Nut 19 Holding screw 20 Insulator 20b Base end 30 Base end 3b Peripheral surface 31 Tip Part 40 Outer peripheral surface 41 Inner peripheral surface 42 Tip surface 43 Outer peripheral surface 44 Tip part 45 Convex part 46 Positioning screw 47 Through hole 48 Through hole 49 Screw hole 50 Tip surface 60 Protruding piece 70 Cylindrical support part 71 Inner peripheral surface 72 Compression fitting Structure 73 Compression fitting structure 74 Flange portion 80 Peripheral surface 81 Metal plate 82 Tip surface 82 Screw 83 Male screw portion 90 Peripheral surface 91 Connection terminal s1 Gap s2 Gap

Claims (9)

a thermocouple capable of high temperature measurement of 1000° C. or higher;
an inner protective tube in which the thermocouple is installed;
A temperature measuring device comprising an outer protective tube in which the inner protective tube is housed,
The outer protective tube includes a first outer protective tube on the distal end side, and a second outer protective tube on the proximal end side, which is connected such that the inner peripheral surface on the distal end side overlaps the outer peripheral surface of the proximal end portion of the first outer protective tube. and a protective tube,
A heat-resistant cement layer is provided in the gap between the overlapping portion between the outer peripheral surface of the base end portion of the first outer protective tube and the inner peripheral surface of the second outer protective tube,
The tip surface of the heat-resistant cement layer is sealed by a retaining ring provided between the outer peripheral surface of the base end portion of the first outer protective tube and the tip surface of the second outer protective tube. Temperature measuring device. 2. The temperature measurement according to claim 1, wherein said retaining ring is welded and fixed to one of a base end outer peripheral surface of said first outer protective tube and a front end surface of said second outer protective tube. Device. The stop ring has an annular projecting piece protruding toward the proximal end and inserted into the gap at an inner peripheral portion that abuts on the outer peripheral surface of the proximal end of the first outer protective tube. 3. The temperature measuring device according to 1 or 2. a thermocouple capable of high temperature measurement of 1000° C. or higher;
an inner protective tube in which the thermocouple is installed;
A temperature measuring device comprising an outer protective tube in which the inner protective tube is housed,
The outer protective tube includes a first outer protective tube on the distal end side, and a second outer protective tube on the proximal end side, which is connected such that the inner peripheral surface on the distal end side overlaps the outer peripheral surface of the proximal end portion of the first outer protective tube. and a protective tube,
A heat-resistant cement layer is provided in the gap between the overlapping portion between the outer peripheral surface of the base end portion of the first outer protective tube and the inner peripheral surface of the second outer protective tube,
The second outer protective tube is made of metal,
A pair of through-holes are provided in the overlapping portion of the first outer protective tube and the second outer protective tube, penetrating the respective tube walls in the radial direction and communicating with each other, and retaining pins are inserted into these through-holes, A temperature measuring device, wherein the head of the retainer pin is fixed to the outer peripheral surface of the second outer protective tube by all-around welding. The overlapping portion of the first outer protective tube and the second outer protective tube is screwed into a penetrating screw hole drilled in the tube wall of the second outer protective tube, and the tip surface is the outer periphery of the first outer protective tube. 5. The temperature measuring device according to claim 4, wherein the positioning screws that contact the surface are provided at a plurality of positions along the circumferential direction. The thermocouple is embedded in a rod-shaped insulator,
A support base for supporting the base end of the insulator, the base end of the inner protective tube, and the base end of the outer protective tube,
Claims 1 to 5, wherein the base end portion of the inner protective tube is supported by the inner peripheral surface of a cylindrical support portion projecting along the outer peripheral surface of the insulator from the front end side of the support base. The temperature measuring device according to any one of 1. 7. The temperature measuring device according to claim 6, wherein said cylindrical support portion has a compression fitting structure for fixing the outer peripheral surface of the base end portion of said internal protective tubular body with a cotter. 8. The temperature measuring device according to claim 6, wherein said support base has a compression fitting structure for fixing the outer peripheral surface of the base end portion of said insulator with a cotter. A metal cylindrical socket for connecting a terminal box is provided on the base end side of the support base,
A metal plate extending from the outer peripheral surface of the cylindrical socket to the outer peripheral surface of the terminal box on the base end side is provided,
The temperature measurement according to any one of claims 6 to 8, wherein the metal plate and the outer peripheral surface of the cylindrical socket are fixed by welding, and the metal plate and the outer peripheral surface of the terminal box are screwed. Device.

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