JPH07333071A - Temperature measuring sensor - Google Patents

Abstract

PURPOSE:To obtain a temperature measuring sensor enabling completion of operations for checkup and replacement in a short time. CONSTITUTION:A temperature measuring sensor has a lead wire connector 19 equipped with a terminal plate 17, a sheath temperature-measuring body 21 connected with the terminal plate 17 and a tubular adaptor 23A fixed to the lead wire connector 19 and holding and surrounding the upper side part of the sheath temperature-measuring body 21, and the sensor is fitted to a body 15 to be measured for the temperature, through the tubular adaptor 23A. The tubular adaptor 23A is made divisible by one-touch type coupler C into the side to be fitted to the body to be measured for the temperature and the side to be fitted to the sheath temperature-measuring body 21.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a temperature measuring sensor.
Especially, the temperature suitable for use in boiler / pipe temperature measurement of various power plants and petrochemical plants, etc. where temperature measurement / replacement of temperature measuring sensor is required quickly, and bearing temperature measurement of pump / fan / motor etc. Regarding sensors.

[0002] A temperature sensor means a sensor such as a thermocouple or a resistance temperature detector which requires a lead wire connector between a sheath temperature sensing element and a lead wire.

Here, a thermocouple will be described as an example of the temperature sensor, but the temperature sensor is not limited to this. That is, as shown in FIG. 1, a case where a thermocouple is attached to the wall portion (attachment portion) 15a of the temperature-measured body 15 via the attachment boss portion (flange portion) 13 of the protective tube 11 will be described as an example. The same applies when the thermocouple is directly attached to the wall of the temperature-measured body.

[0004]

2. Description of the Related Art FIG. 1 shows an example of a conventional thermocouple.

(1) Basically, the thermocouple T includes the terminal plate 17
A lead wire connector 19 including the above, a sheath temperature measuring element 21 connected to the terminal board 17, and a tubular adapter 23 fixedly attached to the lead wire connector 19 and surrounding the upper side of the sheath temperature measuring element 21. It has a different structure. Here, the sheath temperature measuring element 21 has an indentation detection pillar portion 22 formed in the upper portion via a spring seat portion 21a. By the protrusion of the push-in detection column portion 22, it is possible to detect whether or not the push-in is completed in the protective tube 11.

In the illustrated example, the cylindrical adapter 23 is formed of a spring nipple (see FIG. 2).

The spring nipple is a nipple body 25.
A male screw portion for screwing to the lead wire connector 19 and the protective tube mounting boss portion 13 is formed at the upper end portion and the lower end portion of the outer peripheral portion of, respectively, and a lock nut 27 is attached to the upper end male screw portion. . Also, the nipple body 2
5 The spring seat portion 2 of the sheath temperature measuring element 21 is provided in the middle of the inner peripheral portion.
An inner flange portion 29 that engages with the spring 1a is formed, and a spring retainer 31 that is an annular male screw body is attached to the upper end portion of the spring seat portion 21.
A compression coil spring 33 is interposed between a and the spring retainer 31.

The lead wire connector 19 has an upper cap 35.
And a horizontal cap 37 and an elbow type connector main body 39. The connector main body 39 includes a connection work hole 39a into which the upper cap 35 is screwed, a lead wire introduction hole 39b into which the horizontal cap 37 is screwed, and a lower side. And an internal thread portion 39c for fixing the adapter. The terminal plate 17 provided inside the lead wire connector 19 is connected to the compensation lead wire 41 and the lead wire 43 of the sheath temperature measuring element 21, respectively.

(2) Next, a usage mode of the thermocouple will be described.

First, the sheath temperature measuring element 21 having the compensating lead wire 41 at the upper end is attached to the tubular adapter (spring nipple) 2
3 is inserted from above and the spring retainer 31 is screwed to the cylindrical adapter 23, so that the upper portion of the sheath temperature measuring element 21 is held and surrounded.

The connector body 3 is attached to the spring nipple 23.
After 9 is screwed in and fixed with the lock nut 27, the compensating lead wire 41 is connected to the compensating lead wire terminal 17a of the terminal board 17 to assemble a thermocouple (hereinafter referred to as "thermocouple assembly").

Next, the thermocouple assembly is attached to the protective tube 11.
The thermocouple mounting female screw portion 13a formed on the inner circumference of the mounting boss portion 13 is screwed through the lower end male screw portion of the spring nipple 23, and the mounting portion 15 of the temperature-measuring body 15 is attached.
Attach to a.

Finally, the lead wire 43 fitted with the lateral cap 37 is connected to the lead wire terminal 17b of the terminal board 17,
The horizontal cap 37 and the upper cap 35 are screwed to complete the attachment and connection of the thermocouple.

[0014]

However, it has been found that this conventional thermocouple has the following problems.

(1) At the time of inspection work of thermocouples in various power plants and petrochemical plants (usually, the thermocouple assembly is removed from the temperature-measuring object to inspect for normal operation at room temperature). Since the thermocouple is screwed and fixed to the body to be measured, remove the upper cap, remove the lead wire from the terminal board, loosen the screw, connect the lead wire to the terminal board again and inspect, After that, the lead wire was again removed from the terminal board, the lead wire was connected to the lead wire terminal of the terminal board, and the horizontal cap and the upper cap had to be screwed, which required a lot of working time. . Such a long time becomes a serious problem, especially in a place such as a nuclear power plant where exposure time is a problem.

(2) Further, as described above, when the thermocouple assembly is replaced, the lead wire is removed from the terminal board, and
It was necessary to connect the terminals of the lead wires in a limited work posture, and again, much work time was required.

In view of the above, it is an object of the present invention to provide a temperature measuring sensor in which the temperature measuring sensor such as a thermocouple can be inspected and replaced in a short time.

[0018]

A temperature measuring sensor according to the present invention solves the above problems by the following constitution.

A lead wire connector provided with a terminal plate; a sheath temperature measuring element connected to the terminal plate; and a tubular adapter fixedly attached to the lead wire connector for holding and surrounding the upper portion of the sheath temperature measuring element, In a temperature measuring sensor configured to be attached to a temperature-measuring body via the cylindrical adapter, the cylindrical adapter can be divided into a temperature-measuring-body mounting side and a sheath temperature-measuring-body mounting side by a one-touch coupler. It is characterized by

[0020]

The present invention will be described in detail below with reference to FIGS. The same parts as those of the conventional example are designated by the same reference numerals, and the description thereof is omitted in whole or in part.

(1) Basically, the thermocouple T includes the terminal plate 17
A lead wire connector 19 including the above, a sheath temperature measuring element 21 connected to the terminal board 17, and a tubular adapter 23A fixed to the lead wire connector 19 and surrounding the upper side of the sheath temperature measuring element 21. It has a different structure. Up to this point, the configuration is the same as that of the conventional example.

(2) In the above configuration, the cylindrical adapter 23
A is the temperature measurement target mounting side and the sheath temperature measuring body mounting side,
It can be divided by a one-touch coupler C.

Here, the one-touch type coupler means a coupler which is detachable with one touch without being screwed.

For example, a plug portion 53 having a lock groove 51 on the outer circumference of the fitting portion, and an outer portion formed with a ball holding hole 59 for holding a plurality of lock balls 57, which is fitted to the plug via an O-ring 55. It is possible to use a socket 61 having a fitting portion, and a lock releasing sleeve 63 which is externally fitted to the socket portion 61 and is biased by the spring 56 to press the lock ball 57 into the lock groove 51. Yes (see FIG. 4).

The lower side of the one-touch type coupler C is
The one-touch coupler C is screwed to the protection tube mounting boss portion 13, and the upper side of the one-touch coupler C is screwed to the spring nipple 45.

(3) Next, the mode of use of the above embodiment will be described.

A thermocouple mounting internal thread 13a (existing one can be used) formed on the inner circumference of the mounting boss 13 of the protective tube 11 in advance is provided with a lower portion of the coupler C (socket in the example shown in the figure). The part 61) is screwed on. The socket 61 may be directly welded to the mounting boss 13.

First, the sheath temperature measuring element 21 provided with the compensating lead wire 41 is placed above the tubular adapter 23A in which the upper portion (the plug portion 53 in the illustrated example) of the one-touch coupler C is screwed to the lower end of the spring nipple 45. It is inserted from above and fixed by the spring retainer 31, and is held and surrounded by the cylindrical adapter 23A.

After connecting the compensating conductor 41 to the compensating conductor terminal 17a of the terminal plate 17, the connector body 39 is screwed into the spring nipple 45 and fixed with the lock nut 27, and then the compensating conductor 41 is used for the compensating conductor of the terminal plate 17. Terminal 17a
To the lead wire terminal 17b of the terminal board 17, and the horizontal cap 37 and the upper cap 35 are screwed together to assemble a thermocouple (hereinafter referred to as "thermocouple"). "Assembly".).

Next, the thermocouple assembly is slid in advance to the lower portion (the socket portion 61 in the figure) of the coupler C screwed to the protective tube mounting boss portion 13 and the lock releasing sleeve to the unlocking position. Then, the thermocouple assembly is fitted with one touch by being returned by the spring force, and attached to the temperature-measuring body 15. This completes the mounting and connection of the thermocouple.

[0031]

In the temperature measuring sensor of the present invention, since the tubular adapter for mounting the temperature-measuring object can be divided by the one-touch type coupler, the lower side of the one-touch type coupler is previously covered. If the wall of the temperature measuring element is attached, the temperature measuring sensor assembly can be attached / detached to / from the temperature measured element with one touch without twisting work.

Therefore, the temperature measuring sensor assembly can be detached from the temperature measured body while the lead wire is connected to the terminal board.
It can also be attached.

Therefore, the inspection work and the replacement work of the temperature measuring sensor such as the thermocouple can be completed in a short time.

That is, (1) At the time of inspection work of a thermocouple in a nuclear power plant or the like (usually, the thermocouple assembly is removed from the object to be measured and inspected for normal operation at room temperature). Since the assembly body is not fixed to the body to be measured by screwing, it does not require troublesome work as in the past. That is,
Remove the top cap, remove the lead wire from the terminal board, loosen the screw, connect the lead wire to the terminal board again for inspection, then remove the lead wire from the terminal board again, and then remove the lead wire. It is not necessary to screw the horizontal cap and the upper cap by connecting to the lead wire terminal of the terminal board.

(2) Also, the lead wire terminal connection work when replacing the thermocouple assembly is not limited to after the thermocouple assembly is fixed to the temperature-measuring body, and the lead wire connection work is performed in a limited work posture. There is no need to make terminal connections.

[Brief description of drawings]

FIG. 1 is a front half cross section of a conventional thermocouple (temperature sensor).

FIG. 2 is an enlarged sectional view of the connector and the spring nipple of FIG.

FIG. 3 is a front half sectional view of a thermocouple according to an embodiment of the present invention.

FIG. 4 is an enlarged partial sectional view of the one-touch coupler used in FIG.

[Explanation of Codes] 11 Thermometer Protective Tube 13 Mounting Boss 15 Thermocouple 17 Terminal Plate 19 Lead Wire Connector 21 Sheath Thermometer 23 Cylindrical Adapter (Spring Nipple) 41 Compensating Conductor 43 Lead Wire C One-touch Coupler T thermocouple

Claims (3)

[Claims] 1. A lead wire connector having a terminal plate, a sheath temperature measuring element connected to the terminal plate, and a tubular adapter fixed to the lead wire connector and holding and surrounding an upper portion of the sheath temperature measuring element. A temperature measuring sensor configured to be attached to a temperature-measuring body via the tubular adapter, wherein the cylindrical adapter is provided on the temperature-measuring-body mounting side and the sheath temperature-measuring-body mounting side. A temperature measuring element characterized by being divided by. 2. The temperature measuring sensor according to claim 1, wherein the temperature measurement target mounting side of the adapter is mounted to the temperature measurement target via a mounting boss portion of a sheath temperature sensing device protection tube. 3. The temperature measuring sensor according to claim 1, wherein the sheath temperature measuring element mounting side of the adapter is formed by a spring nipple.