JP2929261B2 - Temperature sensor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a temperature sensor.
In particular, temperature suitable for use in boiler / pipe temperature measurement in various power plants and petrochemical plants, etc., which require quickness in temperature detection / replacement of temperature measurement sensors, and in bearing temperature measurement in pumps, fans, motors, etc. Related to 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 detector and a lead wire.

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

[0004]

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

(1) Basically, the thermocouple T is connected to the terminal plate 1
, A sheath temperature sensor 21 connected to the terminal plate 17, and a lead connector 19.
And a tubular adapter 23 fixedly attached to the upper part of the sheath temperature measuring body 21 for holding and surrounding the same. Here, the sheath temperature measuring body 21 has an indentation detection column portion 22 formed at an upper portion thereof via a spring seat portion 21a. This push detection column 22
, The presence or absence of the completion of the pushing into the protection tube 11 can be detected.

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

The spring nipple includes a nipple body 25
At the upper end and the lower end of the outer peripheral portion, a male screw portion for screw connection to the lead wire connector 19 and the protection tube mounting boss portion 13 is formed, respectively, and a lock nut 27 is attached to the upper male screw portion. . Also, the nipple body 2
The spring seat 2 of the sheath temperature measuring body 21
1a is formed, and a spring retainer 31, which is an annular male screw body, is mounted on the upper end portion.
A compression coil spring 33 is interposed between a and the spring retainer 31.

The lead wire connector 19 includes an upper cap 35
, A horizontal cap 37, and an elbow-type connector main body 39. The connector main body 39 has 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 a female screw portion 39c for fixing the adapter. Then, the terminal plate 17 provided inside the lead wire connector 19 is connected to the compensating lead wire 41 and the lead wire 43 of the sheath temperature measuring body 21, respectively.

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

First, a sheath temperature sensor 21 provided with a compensating lead 41 at the upper end is connected to a cylindrical adapter (spring nipple) 2.
By inserting the spring retainer 31 into the cylindrical adapter 23 and screwing the spring retainer 31 into the cylindrical adapter 23, the upper part of the sheath temperature measuring body 21 is held and surrounded.

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

Next, this thermocouple assembly is connected to the protection tube 11.
Screwed into the thermocouple mounting female screw portion 13a formed on the inner periphery of the mounting boss portion 13 through the lower male screw portion of the spring nipple 23.
a.

Finally, the lead wire 43 fitted with the horizontal cap 37 is connected to the lead wire terminal 17b of the terminal plate 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 the conventional thermocouple has the following problems.

[0015] (1) when inspection of the thermocouple at various power plants and petrochemical plants, etc. (usually, to inspect the presence or absence of normal operation at room temperature to remove the thermocouple assembly from the temperature sensing element.) Since the thermocouple is screwed in 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 perform an inspection. Then, again, it was necessary to remove the lead wire from the terminal board, connect the lead wire to the lead wire terminal of the terminal board, and screw the horizontal cap and the upper cap, which required a lot of work time. . Such a large amount of time is a serious problem, especially in locations such as nuclear power plants where exposure time is a concern.

(2) As described above, when replacing the thermocouple assembly, it is necessary to remove the lead wire from the terminal plate and connect the terminal of the lead wire in a limited working posture. After all, it took a lot of work time.

SUMMARY OF THE INVENTION In view of the above, it is an object of the present invention to provide a temperature sensor which requires only a short time to inspect and replace a temperature sensor such as a thermocouple.

[0018]

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

A lead wire connector having a terminal plate, a sheath temperature sensor 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 sensor; The tubular adapter is vertically divided into a sheath temperature measuring body mounting side and a temperature measuring body mounting side, and the sheath temperature measuring body mounting side and the temperature measuring body mounting side are connected by a one-touch coupler, Further, the sheath thermometer mounting side is formed of a spring nipple, and the sheath thermometer is
An upper portion has a push detecting portion via a spring seat portion, and is urged downward by a compression coil spring of the spring nipple so that a side of the cylindrical adapter where the sheath temperature measuring body is mounted is the temperature measuring body. When pushed into the mounting side, after the tip of the sheath temperature sensor contacts the bottom of the tubular adapter , the compression coil
The pusher is projected so that the push detection unit protrudes .

[0020]

Next, the present invention will be described in detail with reference to FIGS. The same parts as those in the conventional example are denoted by the same reference symbols, and all or part of the description thereof is omitted.

(1) Basically, the thermocouple T is connected to the terminal plate 1
, A sheath temperature sensor 21 connected to the terminal plate 17, and a lead connector 19.
And a tubular adapter 23A fixedly attached to the outer surface and holding and surrounding the sheath temperature measuring body 21. Up to this point, the configuration is the same as that of the conventional example.

(2) In the above configuration, the cylindrical adapter 2
3A is divided into upper and lower parts on the side to which the temperature measuring element is attached (protective tube 11) and on the side where the sheath temperature measuring element is attached (nipple body 25),
Sheath measuring a temperature element mounting side nipple body 25 and the protection tube 11 and the one-touch coupler C is the measurement object mounting side
Are joined by

Here, the one-touch coupler refers to a coupler that can be detached and attached with one touch without being screwed.

For example, a plug portion 53 provided with a lock groove 51 on the outer periphery of a fitting portion and an outer portion formed with a ball holding hole 59 for fitting the plug via an O-ring 55 and holding a plurality of lock balls 57. A socket 61 having a fitting portion and a lock releasing sleeve 63 which is fitted to the socket portion 61 and is urged by a spring 56 to press the lock ball 57 into the lock groove 51 can be used. (See FIG. 4).

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

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

A female thread portion 13a for attaching a thermocouple (an existing one can be used) formed in advance on the inner periphery of the attachment boss portion 13 of the protective tube 11 is attached to a lower portion of the coupler C (a socket in the illustrated example). The part 61) is screwed. The socket 61 may be directly welded to the mounting boss 13.

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

After the compensating conductor 41 is connected 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 connected to the compensating conductor of the terminal plate 17. Terminal 17a
, And the lead wire 43 fitted with the horizontal cap 37 is connected to the lead wire terminal 17b of the terminal plate 17, the horizontal cap 37 and the upper cap 35 are screwed, and a thermocouple is assembled (hereinafter, referred to as "thermoelectric"). "A pair assembly".)

Next, the thermocouple assembly is slid in advance on the lower portion (socket portion 61 in the illustrated example) of the coupler C screwed to the protection tube mounting boss portion 13 and the unlocking sleeve is shifted to the unlocking position. Then, the thermocouple assembly is fitted with a single touch by the spring force and attached to the temperature measuring object 15. Thus, the attachment and connection of the thermocouple are completed. At this time, the sheath thermometer of the cylindrical adapter 23A
Connect the mounting side (nipple body 25) to the temperature measuring object mounting side (protective tube
11), and the tip of the sheath temperature sensor 21
Is the bottom of the tubular adapter 23A, that is, the tube of the protection tube 11.
After contact with the bottom, the compression coil spring 33 is compressed and pushed.
The protruding detection pillar 22 protrudes.

[0031]

According to the temperature measuring sensor of the present invention, since the cylindrical adapter for mounting the temperature measuring object can be divided by the one-touch coupler, the lower side of the one-touch coupler is previously covered. if mounted on the wall portion of the temperature sensing element, a temperature measuring sensor assembly, without the task of twisting may be a mounting and dismounting one touch measurement object.

Accordingly, the temperature measuring sensor assembly can be removed from the temperature measuring object while the lead wire is connected to the terminal plate.
Also, it can be attached.

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

That is, (1) At the time of inspection work of a thermocouple at a nuclear power plant or the like (normally, a thermocouple assembly is removed from a body to be measured to check for normal operation at room temperature).
Since the fixing of the thermocouple assembly to the temperature measuring object is not a screw-in type, a troublesome operation as in the related art is unnecessary. That is,
Remove the upper cap, remove it from the terminal board of the lead wire, loosen the screw, connect the lead wire to the terminal board again, perform the inspection, then remove the lead wire from the terminal board again, and further remove the lead wire. It is not necessary to connect to the lead wire terminal of the terminal board and screw the upper cap.

(2) In addition, the work of connecting the lead terminals when the thermocouple assembly is replaced is not limited to the work after the thermocouple assembly is fixed to the temperature measuring object, but the lead wire is restricted in a limited working posture. There is no need to connect the terminals.

[Brief description of the drawings]

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

FIG. 2 is an enlarged sectional view of the connector and the spring nipple of FIG. 1;

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 symbols]

 DESCRIPTION OF SYMBOLS 11 Temperature measuring element protection tube 13 Mounting boss part 15 Temperature measuring object 17 Terminal board 19 Lead wire connector 21 Sheath temperature measuring element 23 Cylindrical adapter (spring nipple) 41 Compensating lead wire 43 Lead wire C One-touch coupler T Thermocouple

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-1-169329 (JP, A) JP-A-6-229838 (JP, A) JP-A 2-150534 (JP, U) JP-A 3-169 30837 (JP, U) Shokai Sho 59-27428 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) G01K 7/02 G01K 1/14

Claims (1)

(57) [Claims] And 1. A lead wire connector having a terminal plate, and the sheath temperature sensing element which is the terminal plate and connected, and a cylindrical adapter which surrounds hold fixed and the sheath temperature sensing element to the lead wire connector The tubular adapter is vertically divided into a sheath temperature measuring body mounting side and a temperature measuring body mounting side, and the sheath temperature measuring body mounting side and the temperature measuring body mounting side are connected by a one-touch coupler. Further, the sheath temperature measuring element mounting side is formed of a spring nipple, and the sheath temperature measuring element is provided with a spring seat portion at an upper portion.
When the sheath temperature measuring body mounting side of the tubular adapter is pushed into the temperature measuring body mounting side, the sheath temperature measurement is performed when the sheath temperature measuring body is pushed downward by the compression coil spring of the spring nipple. After the tip of the body comes into contact with the bottom of the tubular adapter , the compression coil spring is compressed.
Wherein the push-in detecting section is protruded .