JPH1062260A - Protective tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a protective tube wherein vibration is not likely to occur due to contact resistance with liquid or the like. SOLUTION: The protective tube C accepts a temperature measuring body such as a thermocouple or a resistance temperature sensor in a thermoelectric thermometer, a resistance bulb thermometer or the like, wherein at least a temperature measuring part of the protective tube C includes a body cylinder Ca and a tapered guide cylinder Cb protruding aside from the cylinder body Ca across a lengthwise direction of the cylinder body Ca and constituting the protective tube C integral with the cylinder body Ca.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a protection tube used for protecting a so-called thermometer such as a thermocouple in a thermocouple and a resistance thermometer in a resistance thermometer.

[0002]

2. Description of the Related Art In the temperature measurement of fluids, the temperature of powders and granules during transfer, the temperature of processed products during transfer, and the temperature of objects to be processed during transfer, these are measured objects. Insert a thermometer protection tube equipped with a thermocouple, a resistance thermometer, etc. into each fluid, powder / granules during transfer, processed product during transfer, object to be processed during transfer, etc. It was set to a state, and the temperature of these fluids was measured.

[0003]

However, the protective tube of the thermometer provided in a protruding state in the fluid has a portion of the protective tube in contact with the object to be measured having a circular cross-sectional shape. When the fluid pressure of the target fluid is continuously received for a long time, there is a possibility that the protective tube is deformed or the mounting portion is damaged.

Further, the protective tube having the above-mentioned shape of a thermometer which is provided to be protruded into a fluid is vibrated by the fluid, and there is a possibility that metal fatigue may occur in a mounting portion thereof when used over time.

[0005] The danger brought about by such a protective tube is as follows.
It tends to increase as the viscosity of the fluid to be measured increases and the flow velocity increases.

[0006] Further, when such a fluid is formed into a powder or granule as a solid, the above-mentioned fear that is caused to the protective tube tends to be further increased.

[0007] Further, when the object of the temperature measurement is a work being conveyed by a belt conveyor or the like, or a processed object being conveyed by a belt conveyor, the above-mentioned fear brought to the protective tube is as follows. It tends to be even larger.

[0008] The protective tube according to the present invention has a low resistance due to the contact of the gas, liquid, semi-fluid, etc. in the flowing state, and the powder / granular material being pumped by air or the like. The purpose of the present invention is to provide a protective tube C having a structure in which contact resistance due to various articles or the like being transported by a belt conveyor or the like is small, and the protective tube C is hardly vibrated due to contact resistance to these fluids. One of them.

[0009]

According to the present invention, in order to achieve the above object, a protective tube according to the first aspect of the present invention is connected to a thermocouple in a thermometer A such as a thermoelectric thermometer 10 or a resistance thermometer 20. , A protective tube C for accommodating a temperature measuring element B such as a resistance thermometer, wherein at least a portion C ′ of the protective tube C that comes into contact with the object to be measured is a main body Ca and a longitudinal direction of the main body Ca. The main body Ca is provided with a tapered guide portion Cb which protrudes to the side of the main body Ca and forms a protection tube C as a cylindrical body integrally with the main body Ca.

Next, the protective tube C according to the second aspect of the present invention.
In the protective tube C according to the first aspect of the present invention, the guide portion Cb is provided on both sides of the main body portion Ca.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a protective tube C according to each exemplary embodiment of the present invention will be described in detail.

FIGS. 1 to 8 show a thermoelectric thermometer 10 and a protective tube C used for the thermoelectric thermometer. In FIG. 1, a main part of a typical thermoelectric thermometer 10 is cut away and It is shown when viewed from the side where the guide portion Cb does not protrude. FIG.
1 shows a protection tube C according to the first embodiment, in which a main part is cut away, and which is shown in a perspective view when viewed from the front. FIG. 3 shows this in a perspective view from the side. FIG.
3 is a sectional view taken along the line DD in FIG. 3, and FIG.
2 shows a cross-sectional view taken along the line EE in FIG. FIG. 6 is a perspective view of a protective tube C according to the second embodiment, in which main parts are cut away and viewed from the front. FIG. 7 is a sectional view taken along the line FF in FIG. 6, and FIG. 8 is a sectional view taken along the line GG in FIG.

FIGS. 9 to 16 show a resistance thermometer 20 and a protection tube C used for the same. In FIG. 9, a main part of a typical resistance thermometer 20 is cut away to provide a guide portion. C
This is shown from the side where b does not protrude. FIG.
1 shows a protection tube C according to the first embodiment, in which a main part is cut away, and which is shown in a perspective view when viewed from the front. FIG. 11 shows this in a perspective view when viewed from the side. FIG. 12 is a sectional view taken along the line HH in FIG.
Shows a sectional view taken along the line II in FIG.
FIG. 14 is a perspective view of the protection tube C according to the second embodiment, in which main parts are cut away and viewed from the front. FIG. 15 is a sectional view taken along the line JJ in FIG.
FIG. 16 is a sectional view taken along the line KK in FIG.

A thermometer according to this embodiment, in particular, a protection tube C in a thermometer A such as a thermoelectric thermometer or a resistance thermometer.
At least a portion C ′ in contact with the target of the temperature measurement unit,
The main body Ca and a tapered portion that protrudes to the side of the main body Ca in the longitudinal direction of the main body Ca and constitutes a protection tube C as a cylindrical body integrally with the main body Ca. And a guide portion Cb.

In the protective tube C thus configured, when measuring the temperature, the contact resistance of the fluid or semi-fluid to be measured with respect to the portion C 'in contact with the measured object is small, and this fluid, semi-fluid Inconveniences such as deformation of the protective tube C due to a body or the like can be avoided.

The protective tube C thus configured has a low contact resistance with respect to the portion C 'in contact with the object to be measured, such as powder or granules, when measuring the temperature. Inconveniences such as deformation of the protective tube C due to granules can be avoided.

In the protective tube C thus configured, when measuring the temperature, the contact resistance of the processed object, the processed object, and the like to be measured with respect to the portion C ′ in contact with the measured object is small. Inconveniences such as deformation of the protection tube C due to an object or the like can be avoided.

When the temperature is measured, the protective tube C configured as described above is used to measure a fluid, a semi-fluid, a powder, a granule, or the like to be measured with respect to a portion C ′ in contact with the measured object.
It is possible to avoid the inconvenience that the protection tube C is vibrated due to the contact of the processed product or the processed product.

Here, the portion C 'in contact with the object to be measured includes various objects to be measured such as a gas, a liquid, a fluid, a semi-fluid, and a solid such as a powder transferred by a belt conveyor or the like. , The part of the protective tube C used for measuring the temperature of the object to be measured, and specifically, the part of the protective tube C protruding inside the fluid or the like to be measured. Means

(1) Protection tube for thermocouple storage in thermocouple thermometer First, protection tube C of thermocouple thermometer 10 shown in FIGS.
Will be described.

The thermoelectric thermometer 10 according to the illustrated example has a configuration in which a thermocouple is provided as a thermometer B, and a thermocouple wire 11 is held and incorporated in a protective tube C by porcelain insulating tubes 12 to 12. It is. Reference numeral 13 denotes a hot junction of the thermoelectric thermometer 10. Reference numeral 14 denotes a terminal box, and reference numeral 15 denotes a compensating lead.

The protective tube C of the thermoelectric thermometer 10 having such a configuration is inserted into the mounting screw 16, and both are fixed by welding or the like.

The mounting screw 16 used for mounting the thermoelectric thermometer 10 has a head portion 16a formed in a bolt shape and a shaft portion 16b, and a male screw 16c is provided on the outer periphery of the shaft portion 16b. Is provided. A mounting shaft hole 16d communicating with the top surface of the head 16a and the tip surface of the shaft portion 16b.
Is provided in the mounting shaft hole 16d.
Of the protective tube C can be inserted and attached.

The thermoelectric thermometer 10 constructed as described above
The side wall 3 of the measurement object, for example, the fluid transfer pipe 31
The mounting screw 16 is screwed into the screw hole 33 formed in 2 so that the portion C 'of the protective tube C having the hot junction 13 as the temperature measuring body B which is in contact with the measurement object is positioned in the fluid. Used for mounting.

At least a portion C 'of the thermotube 10 in the thermoelectric thermometer 10 used for measuring such a fluid or the like, which is in contact with the object to be measured, has a cross section orthogonal to the tube axis as shown in FIG. The protective tube C to be removed is attached to the main body portion Ca.
On both sides of the body Ca, guides Cb, Cb are provided in a cylindrical body that is continuous with the body Ca over the longitudinal direction.

Here, the guide portion Cb, which communicates with the main body portion Ca and forms a protective tube C as a cylindrical body together with the main body portion Ca, is configured to have a shape that gradually narrows on the distal end side. .

That is, the main body portion Ca and the guide portions Cb,
The cross-sectional shape of the protective tube C constituted by Cb and the direction perpendicular to the tube axis is configured as an ellipse, a rhombus, and a rhombus whose corners are arc-shaped.

As a result, the guide portion Cb at the portion C ′ in contact with the object to be measured is oriented in the direction of the fluid flow so that the thermoelectric thermometer 1
By providing 0 to the transfer pipe 31 or the like as a measurement target, the fluid resistance brought to the protection pipe C in the thermoelectric thermometer 10 is reduced.

Further, in the portion C 'of the protection tube C provided in the fluid, which is in contact with the object to be measured, it is possible to reduce the generation of vibrations caused by the fluid surrounding the protection tube C by the above-described mounting method. Becomes

FIGS. 6 to 8 show a protection tube C according to another embodiment provided in the thermoelectric thermometer 10. FIG.

The protective tube C shown in FIGS. 4 to 8 has at least a portion C ′ in contact with the object of the temperature measuring section, and a cylindrical main body Ca and one side of the main body Ca. The guide portion Cb is provided in the longitudinal direction, and the main body portion Ca and the guide portion Cb form a tubular configuration in which a cross section in a direction orthogonal to the axis becomes a water droplet shape.

The thermoelectric thermometer 10 thus configured is
With respect to the transfer pipe 31 or the like to be measured, a portion C ′ of the protective tube C that is in contact with the measurement target is provided so as to protrude inward of the transfer pipe 31, and furthermore, a guide in the portion C ′ that is in contact with the measurement target. The part Cb is provided so as to face the flow direction of the fluid.

The portion C 'of the protective tube C provided in the fluid in contact with the object to be measured has a low resistance to the fluid as in the case of the protective tube C shown in FIGS. Thus, the protection tube C is hardly vibrated.

The thermoelectric thermometer 10 having the above configuration
Can be used as a means for measuring the temperature of various fluids such as gases and liquids, and for measuring the temperature of semi-fluids. In the measurement of the temperature of the fluid and the semi-liquid, these liquids and the means for transporting the semi-fluid, for example, inside the transfer pipe 31 or the like,
The thermoelectric thermometer 10 is provided and used so that a portion C ′ of the protective tube C provided with the hot junction 13 that contacts the measurement target projects and is positioned.

Further, the thermoelectric thermometer 10 having the above configuration
By using the transported material, for example, various powders, granules, and the like, when measuring in the same manner, for example, such that the powder being pressed by air, the granules come into contact, The thermoelectric thermometer 10 is provided for use in the means for feeding air.

When a variety of processed products and processed products are transferred by a belt conveyor or the like, the processed products and processed products are brought into contact with the object to be measured of the protective tube C having the hot junction 13 in the transferred processed products and processed products. The thermoelectric thermometer 10 is placed on the side of the belt conveyor or the like so that the portion C ′ is introduced.
And use it.

(2) Protective tube for storing resistance thermometer in resistance thermometer Next, the protection tube C of the resistance thermometer 20 shown in FIGS. 9 to 16 will be described.

The resistance thermometer 20 according to the illustrated example has a configuration in which a temperature measuring resistor is provided as a temperature measuring element B, and a metal temperature measuring resistor 21 such as a platinum coil is provided inside a protective tube C with a heat conducting plate 22. Incorporated with. Reference numeral 23 denotes a terminal box, and reference numeral 24 denotes a conductor.

The protective tube C of the resistance thermometer 20 having such a structure is inserted into the mounting screw 25, and the two are fixed by welding or the like.

The mounting screw 25 used for mounting the resistance thermometer 20 has a head portion 25a formed in a bolt shape and a shaft portion 25b, and a male screw 25c is provided on the outer periphery of the shaft portion 25b. Is provided. A mounting shaft hole 25d communicating with the top surface of the head 25a and the tip surface of the shaft portion 25b.
Is provided in the mounting shaft hole 25d.
Of the protective tube C can be inserted and attached.

The resistance thermometer 20 constructed as described above
The side wall 3 of the measurement object, for example, the fluid transfer pipe 31
The mounting screw 25 is screwed into the screw hole 33 formed in FIG. 2 and a portion C ′ of the protection tube C provided with the metal temperature measuring resistor 21 such as a platinum coil as the temperature measuring body B in contact with the measurement object C ′.
Is used to be positioned in the fluid.

A section C 'of the resistance thermometer 20 used for measurement of such a fluid or the like, which is in contact with the object to be measured of the protective tube C, has a cross section orthogonal to the tube axis as shown in FIG. The protective tube C is provided with a main body portion Ca, and guide portions Cb and Cb are provided on both sides of the main body portion Ca in a tubular shape continuous with the main body portion Ca in the longitudinal direction thereof.

Here, the guide portion Cb, which communicates with the main body portion Ca and forms a protective tube C together with the main body portion Ca,
It is configured as a shape that gradually narrows on the distal end side.

That is, the main body portion Ca and the guide portions Cb,
The cross-sectional shape of the protective tube C constituted by Cb and the direction perpendicular to the tube axis is configured as an ellipse, a rhombus, and a rhombus whose corners are arc-shaped.

As a result, the transfer tube 3 with the resistance thermometer 20 as a measurement target is oriented with the guide portion Cb directed in the flow direction of the fluid.
1 etc., the resistance thermometer 20
, The fluid resistance brought to the portion C ′ of the protection tube C in contact with the measurement object is reduced.

The portion C 'of the protective tube C provided in such a fluid, which is in contact with the object to be measured, is subjected to vibration caused by the fluid surrounding the portion C' of the protective tube C, which is in contact with the object to be measured, by the above-described mounting method. Occurrence can be reduced.

FIGS. 14 to 16 show a protection tube C according to another embodiment provided in the resistance thermometer 20.

The protection tube C shown in FIGS. 14 and 16
The portion C ′ in contact with the measurement object is a cylindrical main body Ca
A guide portion Cb is provided on one side of the main body portion Ca in the longitudinal direction thereof, and the main body portion Ca and the guide portion Cb form a cylindrical shape having a water-drop-shaped cross section in a direction perpendicular to the axis. There is a configuration.

The resistance thermometer 20 configured as described above is
With respect to the transfer pipe 31 or the like as a measurement target, a portion C ′ of the protection pipe C that is in contact with the measurement target is provided so as to protrude inward of the transfer pipe 31, and the guide portion Cb in the protection pipe C is Provide for the direction of fluid flow.

The portion C 'of the protective tube C provided in the fluid in contact with the object to be measured is the same as that shown in FIGS.
As in the case of the protective tube C, the resistance received from the fluid is small, and the fluid hardly causes the protection tube C to vibrate.

The resistance thermometer 20 constructed as described above
Can be used as a means for measuring the temperature of various fluids such as gases and liquids, and for measuring the temperature of semi-fluids. In the measurement of the temperature of the fluid and the semi-liquid, these liquids and the means for transporting the semi-fluid, for example, inside the transfer pipe 31 or the like,
A resistance thermometer 20 is provided and used so that a portion C ′ of the protection tube C provided with the metal resistance bulb 21 in contact with the measurement target projects and is positioned.

The resistance thermometer 20 constructed as described above
By using a transported material, for example, various powders, granules, etc., when measuring by the same method, so that the powder being pressed by air, the granules, etc. come into contact, A resistance thermometer 20 is provided and used for the means for feeding air.

When a variety of processed products and processed products are transferred by a belt conveyor or the like, the measurement of the protective tube C provided with the metal resistance bulb 21 in the processed products or processed products during the transfer is performed. The resistance thermometer 20 is provided and used on the side of the belt conveyor or the like so that the portion C ′ in contact with the object is guided.

[0054]

The protective tube C of the thermometer A according to the present invention, particularly the thermometer A such as a thermoelectric thermometer or a resistance thermometer, has at least a portion C 'in contact with the object to be measured, and a main body C.
a, and a tapered guide portion that protrudes to the side of the main body portion Ca in the longitudinal direction of the main body portion Ca and forms a cylindrical protective tube C integrally with the main body portion Ca. Because of the configuration including Cb, when measuring the temperature, the contact resistance of a fluid or a semi-fluid to be measured is small, and such a fluid or semi-fluid causes the protective tube C to be deformed. It has the feature that can avoid.

Also, The protection tube C thus configured is
When measuring the temperature, the contact resistance of the powder, granules, etc., to be measured is low, and the powder, granules, etc., have the advantage of avoiding inconvenience such as deformation of the protective tube C. ing.

The protection tube C thus configured is
When measuring the temperature, there is a feature that the contact resistance of the processed product or the processed object to be measured is small, and the inconvenience such that the protective tube C is deformed by the processed product or the processed product can be avoided. .

The protection tube C thus configured is
When measuring the temperature, it is possible to avoid the inconvenience of causing vibration in the protective tube C due to the contact of the fluid, semi-fluid, powder, granule, processed product, or processed material to be measured. It has the following features.

[Brief description of the drawings]

FIG. 1 is a front view showing an example of mounting a typical thermoelectric thermometer, with a main part broken away.

FIG. 2 is a partially broken perspective view showing a typical example of a protection tube constituting a thermoelectric thermometer.

FIG. 3 is a perspective view of the partially cutaway seen from the side.

FIG. 4 is a sectional view taken along the line DD of FIG. 3;

FIG. 5 is a sectional view taken along line EE of FIG. 3;

FIG. 6 is a partially broken perspective view showing a typical example of another protective tube constituting a thermoelectric thermometer.

FIG. 7 is a sectional view taken along line FF of FIG. 6;

8 is a sectional view taken along line GG of FIG. 6;

FIG. 9 is a front view showing an example of mounting a typical resistance thermometer, with main parts broken.

FIG. 10 is a partially broken perspective view showing a typical example of a protection tube constituting a resistance thermometer.

FIG. 11 is a partially cutaway perspective view seen from the side.

FIG. 12 is a sectional view taken along line HH of FIG. 11;

13 is a sectional view taken along the line II of FIG. 11;

FIG. 14 is a partially broken perspective view showing a typical example of another protective tube constituting the resistance thermometer.

FIG. 15 is a sectional view taken along the line JJ of FIG. 14;

16 is a sectional view taken along the line KK of FIG.

[Explanation of symbols]

 A Thermometer B Thermometer C Protective tube C 'Part in contact with the object to be measured 10 Thermoelectric thermometer 20 Resistance thermometer

Claims (2)

[Claims] 1. A protective tube for accommodating a thermocouple and a temperature measuring element such as a resistance thermometer in a thermometer such as a thermoelectric thermometer and a resistance thermometer, wherein at least a portion of the protective tube in contact with a measurement object is Over the main body and the longitudinal direction of the main body,
A protection tube, comprising: a protruding portion that protrudes to the side of the main body and forms a tubular body integrally with the main body. 2. The protection tube according to claim 1, wherein the guides are provided on both sides of the main body.