JPH109966A - Thermometer for pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a thermometer which prevents a liquid from being leaked to the outside even when a well is damaged so as to spoil liquidtightness by a method in which a bellows which is arranged so as to surround a thermocouple in the circumferential direction is provided and a bellows ring which is fixed and bonded to the bellows and the thermocouple is provided. SOLUTION: By means of an inside bellows 23 which is arranged at the inside of a thermometer for a pipe so as to surround a thermocouple 1 in the circumferential direction and by means of a bellows ring 24 which is fixed to the bellows and to the outer circumferential part of the thermocoupler 1, the communication of a space at the inside of a well 18 inserted into the inside of the pipe with a space at the inside of a sleeve pipe 21 at a thermometer body 19 is cut off. Consequently, even when the well 18 is damaged so as to spoil liquidtightness, a liquid which is circulated at the inside of the pipe is not leaked to the outside of the pipe via the inside of the thermometer body 19 from the damaged part of the well 18. In addition, since the expansion or the contraction of the thermocoupler 1 due to heat is absorbed by the inside bellows 23, an excess stress does not act on respective members which form the thermometer for the pipe.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thermometer for piping.

[0002]

2. Description of the Related Art FIGS. 3 to 5 show an example of a conventional pipe thermometer, which is a thermometer main body 2 having a thermocouple 1 as temperature detecting means (FIG. 3 and FIG. 3). And a thermometer support member 4 (see FIG. 5) for supporting the thermometer main body 2 with respect to the pipe 3 without bringing the thermocouple 1 into contact with the fluid whose temperature is to be detected. .

The thermometer main body 2 includes a thermocouple 1 formed in a thin rod shape and having an adapter 5 at an end on the base end A side, a boss 6 fitted at an intermediate portion in the longitudinal direction of the thermocouple 1, and A sleeve tube 7 which is loosely fitted to the thermocouple 1 and is coaxially fixed to the base A side end of the boss 6, and is inserted and fixed to the base A side end of the sleeve tube 7 and surrounds the adapter 5. A guide tube 8 surrounding the adapter 5, a spring 9 disposed inside the guide tube 8 so as to surround the adapter 5 in a circumferential direction, and compresses the spring 9 to urge the adapter 5 toward the distal end B. As described above, a spring retainer 10 provided at the proximal end A side end of the guide tube 8 and a connector 11 having a hollow structure which is externally screwed to the proximal end A side end of the guide tube 8 are provided. I have.

[0004] As shown in FIG. 4, a thermocouple 1 has a hollow sheath 12 made of stainless steel, a thermocouple wire 13 inserted inside the sheath 12, and a filling inside the sheath 12. And the insulating material 14 made of magnesium oxide.
3 is connected to a terminal 16 inside the connector 11 via a lead wire 15.

On the other hand, as shown in FIG. 5, the thermometer supporting member 4 is connected to the pipe 3 so as to be coaxial with an opening 3a formed at a predetermined position of the pipe 3 through which the fluid whose temperature is to be detected flows. A nozzle 17 fixed to the outer peripheral surface of the nozzle 3 in a liquid-tight manner;
The base has a well 18 having a closed side end and an open end at the base A side.

The well 18 is inserted into the nozzle 17 from the outside of the pipe 3 so that the end on the distal end B side is located inside the pipe 3, and the portion near the end on the proximal end A is inserted into the nozzle 17. On the other hand, it is fixed in a liquid-tight manner.

In the thermometer main body 2, the thermocouple 1 is inserted into the well 18 and the boss 6 is inserted and screwed to the base A side end of the well 18 in a liquid-tight manner. The thermometer main body 2 is supported on the pipe 3 without the thermocouple 1 coming into contact with the fluid to be detected.

[0008]

However, in the piping thermometer shown in FIGS. 3 to 5, the thermometer body 2 has a portion between the thermocouple 1 and the boss 6, a portion between the adapter 5 and the guide tube 8, and a connector. 11 are not liquid-tight, if the well 18 is damaged such that the liquid-tightness is impaired, the fluid flowing through the inside of the pipe 3 flows through the inside of the well 18, the thermocouple 1 and the boss 6. Between the inside of the sleeve tube 7,
It leaks between the adapter 5 and the guide tube 8 and through the connector 11 to the outside of the piping thermometer.

On the other hand, it is conceivable that the thermocouple 1 is fixed to the boss 6 in a liquid-tight manner by welding. However, if the thermocouple 1 and the boss 6 are made liquid-tight by welding, a thermocouple caused by heat is generated. 1 is restrained from expanding or contracting, causing excessive stress to act on each member.

The present invention has been made in view of the above-mentioned circumstances, and provides a pipe thermometer in which a fluid flowing inside a pipe does not leak to the outside even if damage such as impairing liquid tightness occurs in a well. It is intended to be.

[0011]

In order to achieve the above object, a pipe thermometer according to the present invention is arranged such that the tip is closed and the tip is located inside a pipe through which a fluid whose temperature is to be detected flows. A well having a hollow structure attached to the pipe, a boss fixed to a base end of the well, a thermocouple inserted into the boss such that a tip is located within a tip of the well, and a thermocouple A bellows disposed so as to surround the boss in the circumferential direction and having a tip portion fixed in a liquid-tight manner to the boss;
A bellows ring externally fitted to the thermocouple so as to face the base end of the bellows and fixed to both the base end of the bellows and the outer periphery of the thermocouple in a liquid-tight manner.

In the pipe thermometer according to the present invention, when the well is damaged so that the liquid tightness is impaired, and when the fluid flowing through the inside of the pipe flows into the well from the damaged portion, the bellows is moved. Prevent leakage of fluid to the outside.

The bellows absorbs expansion or contraction of the thermocouple caused by heat.

[0014]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a first embodiment of a piping thermometer according to the present invention. In FIG. 1, the structure of a thermometer supporting member 4 composed of a nozzle 17 and a well 18 is shown. 5) is the same as that of the above-mentioned conventional pipe thermometer, and other portions denoted by the same reference numerals as those in FIGS. 3 to 5 represent the same components.

Reference numeral 19 denotes a thermometer main body.
Reference numeral 9 denotes an adapter 5 formed in a thin rod shape and
, A boss 20 externally fitted to the middle of the thermocouple 1 in the longitudinal direction, and a boss 20 loosely fitted to the thermocouple 1
A sleeve tube 21 coaxially fixed to the proximal end A side end of
An outer guide tube 22 inserted and fixed to the proximal end A side end of the sleeve tube 21, a guide tube 8 inserted and fixed to the outer guide tube 22 and surrounding the adapter 5 in the circumferential direction;
A spring 9 disposed inside the guide tube 8 so as to surround the adapter 5 in the circumferential direction; and a proximal end of the guide tube 8 so as to compress the spring 9 and urge the adapter 5 toward the distal end B. Spring retainer 10 provided at the A-side end
And a connector 11 having a hollow structure which is externally screwed onto the end of the outer guide tube 22 on the proximal end A side. The thermocouple 1 is inserted into the well 18, and the boss 20 is 1
8.

Further, inside the sleeve tube 21,
A metal inner bellows 23 and a bellows ring 24 are provided.

The inner bellows 23 is disposed inside the sleeve tube 21 so as to surround the thermocouple 1 in the circumferential direction, and the end on the tip B side is fixed to the boss 20 in a liquid-tight manner.

The bellows ring 24 is provided inside the sleeve tube 21 at the proximal end A of the internal bellows 23.
It is externally fitted at a required position of the thermocouple 1 so as to face the side end, and is liquid-tightly fixed to both the base A side end of the inner bellows 23 and the outer periphery of the thermocouple 1.

In the thermometer for piping shown in FIG. 1, an inner bellows 23 is arranged inside the thermometer for piping so as to surround the thermocouple 1 in the circumferential direction, and the inner bellows 23 and the outer peripheral portion of the thermocouple 1 are connected to each other. The communication between the space inside the well 18 inserted into the pipe 3 and the space inside the sleeve tube 21 of the thermometer main body 19 is blocked by the fixed bellows ring 24.

Therefore, even if the well 18 is damaged such that the liquid tightness is lost, the fluid flowing through the inside of the pipe 3 will flow from the damaged part of the well 18 through the inside of the thermometer main body 19 to the pipe 3. There is no leakage outside.

Further, since the expansion or contraction of the thermocouple 1 due to heat is absorbed by the internal bellows 23, no excessive stress acts on each member forming the pipe thermometer.

FIG. 2 shows a second embodiment of a piping thermometer according to the present invention. In FIG. 2, the structure of a thermometer supporting member 4 constituted by a nozzle 17 and a well 18 is shown. 5) is the same as that of the above-mentioned conventional pipe thermometer, and other portions denoted by the same reference numerals as those in FIG. 1 and FIGS. 3 to 5 represent the same components.

Reference numeral 25 denotes a thermometer main body.
5 is formed in a thin rod shape and has an adapter 5
A boss 26 having a connecting portion 26a which is fitted around the middle portion of the thermocouple 1 in the longitudinal direction and which surrounds the thermocouple 1 in the circumferential direction at the base A side end; Base A
A distal end side guide tube 27 slidably fitted to the connecting portion 26a at a predetermined distance from the side end portion.
A base-side guide tube 28 loosely fitted to the thermocouple 1 at a predetermined distance from the base A-side end of the distal-side guide tube 27; An outer guide tube 29 inserted and fixed to the proximal end A side end of the guide tube 28; a guide tube 8 inserted into the outer guide tube 29 and surrounding the adapter 5 in the circumferential direction; A spring 9 is provided so as to surround the peripheral portion 5 in the circumferential direction. The spring 9 is provided at a proximal end A side end of the guide tube 8 so as to compress the spring 9 and urge the adapter 5 toward the distal end B side. Spring retainer 10 and base end A of outer guide tube 29
It has a connector 11 having a hollow structure which is externally fitted and screwed to a side end. The thermocouple 1 is inserted into the well 18, and the boss 26 is fixed to the well 18.

Further, a metal outer bellows 30 and a bellows ring 31 are provided between the boss 26 and the base end side guide tube 28.

The outer bellows 30 surrounds the connecting portion 26a and the distal end side guide tube 27 which are fitted to the thermocouple 1 in the circumferential direction between the boss 26 and the proximal end side guide tube 28. The boss 2 is disposed and the end on the tip B side is
6 is fixed in a liquid-tight manner.

The bellows ring 31 is externally fitted to the thermocouple 1 between the distal end side guide tube 27 and the proximal end side guide tube 28, and the proximal end A side end of the external bellows 30 and the distal end side. Base A side end of guide tube 27, base end side guide tube 28
And the outer peripheral portion of the thermocouple 1 are fixed in a liquid-tight manner.

In the piping thermometer shown in FIG. 2, an external bellows 30 is disposed at a longitudinally intermediate portion of the piping thermometer so as to surround the thermocouple 1 in the circumferential direction, and the external bellows 30 and the thermocouple 1 are connected to each other. Bellows ring 3 fixed to the outer periphery
1 blocks communication between the space inside the well 18 inserted into the pipe 3 and the space inside the outer guide tube 29 of the thermometer main body 25.

Therefore, even if the well 18 is damaged such that the liquid-tightness is impaired, the fluid flowing through the inside of the pipe 3 will flow from the damaged part of the well 18 through the inside of the thermometer main body 25 to the pipe 3. There is no leakage outside.

Further, since the expansion or contraction of the thermocouple 1 caused by heat is absorbed by the external bellows 30, excessive stress does not act on each member forming the pipe thermometer.

It should be noted that the piping thermometer of the present invention is not limited to the above-described embodiment, and it is needless to say that various changes can be made without departing from the gist of the present invention.

[0032]

As described above, according to the pipe thermometer of the present invention, the bellows arranged so as to surround the thermocouple in the circumferential direction, and the bellows ring fixed to the bellows and the thermocouple are provided. As a result, the inside of the well inserted inside the pipe is shut off from the outside,
Even if the wells are damaged such that the liquid tightness is impaired, the fluid flowing inside the pipes will not leak from the damaged parts of the wells to the outside of the pipes, and thermocouples caused by heat will not occur. Since the expansion or shrinkage of the pipe is absorbed by the bellows, an excellent effect that an excessive stress does not act on each member forming the pipe thermometer can be obtained.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a first example of an embodiment of a pipe thermometer according to the present invention.

FIG. 2 is a cross-sectional view illustrating a second example of the embodiment of the piping thermometer according to the present invention.

FIG. 3 is a sectional view showing an example of a conventional pipe thermometer.

FIG. 4 is a partial cross-sectional view of the thermocouple associated with FIG.

FIG. 5 is a cross-sectional view of the thermometer support member associated with FIG.

[Explanation of symbols]

 Reference Signs List 1 thermocouple 3 piping 18 well 20 boss 23 internal bellows (bellows) 24 bellows ring 26 boss 30 external bellows (bellows) 31 bellows ring

Claims (1)

[Claims] 1. A well having a hollow structure attached to a pipe so that the tip is closed and the tip is located inside a pipe through which a fluid whose temperature is to be detected flows, and is fixed to a base end of the well. Boss, a thermocouple inserted into the boss such that the tip is located within the tip of the well, and a thermocouple is disposed so as to surround the thermocouple in the circumferential direction, and the tip is liquid-tight with respect to the boss. A fixed bellows, and a bellows ring externally fitted to the thermocouple so as to face the base end of the bellows and fixed in a liquid-tight manner to both the base end of the bellows and the outer periphery of the thermocouple. A thermometer for piping, comprising: