JP2003227761A - Sensor for measuring temperature in pressure vessel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a temperature sensor capable of measuring temperature with no response lag or error by making a temperature sensing part directly contact a pressure fluid which does not leak from a vessel through a rigid pipe. <P>SOLUTION: A cable protecting pipe is inserted in the rigid pipe which is air-tightly fitted to the through hole of the pressure vessel. The void in the rigid pipe is filled with a sealing resin which is fixed to the rigid pipe. A portion in lengthwise direction in the rigid pipe of the cable protecting pipe is provided with a discontinuous part so that a cable is exposed. The void between the cable protecting pipe and the cable is also filled with the sealing resin through the discontinuous part. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a temperature sensor for measuring the temperature of a fluid in a pressure vessel, and more particularly to improvement of its responsiveness.

[0002]

2. Description of the Related Art As a sensor for measuring the temperature of a fluid in a pressure vessel, a temperature sensor shown in cross section in FIG. 2 is known. The temperature sensor 90 includes a heat-sensitive portion 91 formed of a thermocouple temperature-measuring contact, the heat-sensitive portion 91, and a pressure vessel 99.
A cable 92 for connecting to a circuit portion provided outside the cable, a cable protection tube 93 for inserting the cable 92 to identify the position of the temperature sensing portion 91 and holding it, and surrounding the cable protection tube 93. And insulates the temperature sensing portion 91 from contact with the pressure fluid, and inserts the intermediate flange 9 into the through hole 99A of the pressure vessel 99.
8 and a metal pipe 94 which is attached airtightly. The intermediate flange 98 is screwed into the through hole 99A with a taper screw via a seal tape, and the flange portion 94A of the metal pipe is screwed and attached to the intermediate flange 98. The ring 97 ensures airtightness of the container.

[0003]

Although such a temperature sensor 90 can measure the temperature inside the pressure vessel 99 while maintaining the airtightness of the pressure vessel 99, the temperature sensor 91 is in direct contact with the pressure fluid. Since it does not exist, there is a delay in heat transfer,
It was difficult to avoid the delay of the response to temperature, and there was a temperature error due to the heat radiation of the metal tube. However, if the temperature sensing portion 91 is directly contacted with the pressure fluid, there is a problem that the cable 92 extending inside and outside the pressure vessel 99 and the vessel penetrating portion of the cable protection tube 93 cannot be fixed airtightly. The present invention has been made in view of such problems, and the temperature sensing portion can directly contact the pressure fluid, and the cable and the cable protection tube can be airtightly fixed to the container. It is intended to provide a temperature sensor.

[0004]

SUMMARY OF THE INVENTION The present invention has been accomplished in order to achieve the above-mentioned object, and its gist structure and operation will be described below.

A temperature sensor according to a first aspect of the present invention is arranged in a pressure vessel and has a temperature-sensitive portion whose electrical characteristics change depending on temperature, a cable connecting the temperature-sensitive portion and a circuit portion provided outside the vessel, Also, in a temperature sensor having a cable protection tube that inserts a cable inside to identify and hold the position of the temperature sensing portion, a rigid pipe that is directly or indirectly attached to the through hole of the pressure vessel in an airtight manner. The cable protection tube is inserted into this rigid pipe, and the sealing resin is filled into the voids in the rigid pipe to fix it to the rigid pipe. Is provided so that the sealing resin is filled in the gap between the cable protection tube and the cable.

According to this temperature sensor of the present invention, since the cable protection tube is inserted through the rigid pipe whose both ends are open, the temperature sensing portion is blocked by the rigid pipe and comes into contact with the pressure fluid. Is not disturbed. Also, in the rigid pipe that is airtightly attached to the pressure vessel, the gap between the rigid pipe and the cable protection pipe and the gap between the cable protection pipe and the cable are all filled with resin, so the pressure fluid is It does not leak through the pipe to the outside of the container. Therefore, while maintaining the airtightness of the pressure container, the temperature sensing part can be in direct contact with the pressure fluid, enabling temperature measurement without response delay or error. You can

According to a second aspect of the present invention, there is provided the temperature sensor of the first aspect.
In the above description, the temperature sensing part is used as a temperature measuring contact of a thermocouple.

According to this temperature sensor, since the temperature sensing portion is the temperature measuring contact of the thermocouple, it is possible to provide the temperature sensor capable of measuring the pressure fluid in the high temperature region.

The temperature sensor according to claim 3 is the temperature sensor according to claim 1.
1 to 2, the cable protection tube is formed of a flexible tube made of glass fiber.

In this temperature sensor, the cable protection tube is made of a flexible tube made of glass fiber. Therefore, the temperature protection part can be fixed at a required position by freely bending the cable protection tube. On the other hand, in the conventional temperature sensor shown in FIG. 2, since the metal pipe is a straight pipe, it is not possible to freely set the position of the temperature sensing portion, and the temperature at a desired position in the pressure vessel can be set. It was impossible to measure and obtain the temperature distribution in the container.

According to a fourth aspect of the present invention, there is provided the temperature sensor of the first aspect.
1 to 3, the sealing resin is formed of a two-component curing type epoxy resin.

According to this temperature sensor, since the sealing resin is formed of a two-component curing type epoxy resin, it can be filled even in a narrow space and the airtightness is maintained after solidification. Therefore, the pressure fluid does not leak out of the container through the rigid pipe.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a temperature sensor according to the present invention will be described below with reference to FIG. 1 showing the temperature sensor 10 in a sectional view. The temperature sensor 10 includes a heat-sensitive portion 11 formed of a thermocouple temperature-measuring contact, a cable 12 connecting the heat-sensitive portion 11 to a circuit portion provided outside the pressure vessel 20, and a cable inserted through the cable 12. 12
A cable protection tube 1 for supporting the temperature and specifying the position of the temperature sensing portion 11.
3 and 3.

This temperature sensor 10 is provided with a rigid pipe 14 which is airtightly attached to a through hole 22 provided in a wall of a pressure vessel 20 through an intermediate flange 21 and has both ends open. , The rigid pipe 1 is inserted through the cable protection tube 13 holding the temperature sensitive portion 11 at the tip.
The sealing resin 16 is filled in the space between the cable protection pipe 13 and the cable protection pipe 13, and the sealing resin 16 is solidified to fix the cable protection pipe 13 to the rigid pipe 14.

Further, a part of the cable protection tube 13 disposed in the rigid pipe 14 in the longitudinal direction is removed to provide a discontinuous portion 15 for exposing the cable 12, and this discontinuous portion 15 is also provided. The sealing resin 16 is filled, and the void 17 formed between the cable protection tube 13 and the cable 12 is also filled with the sealing resin 16 from this portion. By thus filling and solidifying the sealing resin 16, it is possible to completely prevent the pressure fluid from leaking to the outside of the container along a part of the rigid pipe.

Here, the intermediate flange 21 is screwed into the through hole 22 with a taper screw via a seal tape, and the flange portion 14A of the rigid pipe 14 is screwed into the intermediate flange 21 with a straight screw. The pressure vessel 20 is airtightly secured by the O-ring 23 provided between them.

It is desirable that the cable protection tube 13 can change the position of the temperature sensor 11 freely and fix it there.
For that purpose, the temperature sensor 11 is flexible and at the same time.
Must be made of a material with sufficient rigidity to hold the position of, for example, glass fiber.

Sealing resin 16 used for the temperature sensor 10
As a bond ED set manufactured by Konishi Co., Ltd. (main ingredient +
It is preferable to use a two-component curing type epoxy resin such as a curing agent). In this case, it is possible to fill even a narrow void without a gap, so that perfect airtightness can be obtained.

A temperature measuring resistor whose resistance changes greatly depending on temperature may be used as the temperature sensing portion 11 used for temperature measurement, but in order to measure up to a high temperature, a thermocouple made of a combination of a plurality of different metals is used. It is preferable to use a temperature measuring contact, and a representative example is a combination of alumel and chromel as a plurality of different metals. In this case, the cable 12 that connects the temperature sensing portion and the circuit provided outside the pressure vessel 20 is made of these different metals themselves.

[0020]

EXAMPLES A tire mounted on a rim is used as a pressure vessel, a through hole for passing the temperature sensor is provided in the rim, and the temperature sensor having the structure shown in FIG.
This temperature sensor is attached so that the temperature sensing portion is located at the center of the tire inner space, and a current is passed through a heater of a predetermined wattage provided in the tire inner space to raise the temperature of the tire inner space. The time required for the measured temperature to rise from 30 degrees to 120 degrees Celsius was measured, and this was compared with that of the conventional temperature sensor shown in FIG. The results are shown in Table 1. Also, to check the airtightness of the examples,
The temperature sensor of the example was attached to a wheel, 260 MPa of air was filled into the tire, and the internal pressure of the tire was measured again after 72 hours. It was confirmed that the pressure of 260 MPa was maintained even after 72 hours.

Table 1 also shows the main specifications of the temperature sensor used for this measurement. As shown in Table 1, it is shown that the temperature sensor of the present invention was able to greatly improve its temperature responsiveness as compared with the conventional sensor. The temperature sensor of the example also measured the surface temperature at the center position in the width direction of the well portion of the rim.However, the temperature sensor of the conventional example cannot measure the temperature because the temperature sensing part cannot be arranged at this position. It was

[0022]

[Table 1]

[0023]

As is apparent from the above description,
According to the present invention, the cable protection tube is inserted into the rigid pipe that is airtightly attached to the through hole of the pressure vessel, and the gap is filled with the sealing resin to fix the rigid pipe to the rigid pipe. Providing a discontinuous portion that exposes the cable in a part in the longitudinal direction inside the rigid pipe of the protection tube,
Since the gap between the cable protection tube and the cable was also filled with the sealing resin through this discontinuity, the temperature sensing part was brought into direct contact with the pressure fluid to enable temperature measurement without response delay or error. It is possible to provide a temperature sensor in which pressure fluid does not leak inside the rigid pipe to the outside of the container.

[Brief description of drawings]

FIG. 1 is a sectional view showing a temperature sensor according to an embodiment of the present invention.

FIG. 2 is a sectional view showing a conventional temperature sensor.

[Explanation of symbols]

10 Temperature sensor 11 heat sensitive part 12 cables 13 Cable protection tube 14 Rigid pipe 14A Rigid pipe flange 15 Cable protection tube discontinuity 16 Sealing resin 17 Air gap between cable protection tube and cable 20 Pressure vessel 21 Intermediate flange 22 through hole 23 O-ring

Claims (4)

[Claims] 1. A temperature-sensing section which is arranged in a pressure vessel and whose electric characteristics change depending on temperature, a cable which connects the temperature-sensing section and a circuit section provided outside the vessel, and a cable which is inserted inside. In a temperature sensor equipped with a cable protection tube that specifies and holds the position of the temperature sensing part, a rigid pipe that is airtightly attached is provided directly or indirectly in the through hole of the pressure vessel, and the cable protection tube is It is inserted into this rigid pipe, the voids in the rigid pipe are filled with sealing resin and fixed to the rigid pipe, and a discontinuity exposing the cable in the longitudinal direction part of the rigid pipe of the cable protection pipe is provided. , A temperature sensor in which the gap between the cable protection tube and the cable is filled with sealing resin through this discontinuity. 2. The temperature sensor according to claim 1, wherein the temperature sensing part is a temperature measuring contact of a thermocouple. 3. The temperature sensor according to claim 1, wherein the cable protection tube is a flexible tube made of glass fiber. 4. The temperature sensor according to claim 1, wherein the sealing resin is formed of a two-component curing type epoxy resin.