JPH0434433Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an apparatus for measuring the temperature inside a pipe buried underground.

[Conventional technology]

Traditionally, thermometers used to measure the temperature inside pipes are
There are Utility Model Application Publication No. 58-136739, Utility Model Application No. 57-14031, and Utility Model Application No. 60-33634.

In the device disclosed in Japanese Utility Model Application Publication No. 58-136739, a thermocouple 26 to which a conducting wire 27 is connected is inserted into a tube 25, as shown in FIG.

As shown in FIGS. 5 to 7, the device disclosed in Japanese Utility Model Application Publication No. 57-14031 has a protective tube 30 inserted into the tube 25, and a helical temperature sensing section connected to a capillary tube 31 inside the protective tube 30. 32, or a plurality of temperature sensing sections 33 connected in series through capillary tubes 31 are provided inside the protective tube 30.

The liquid expansion thermometer described in the microfilm photographing the specification and drawings attached to the application of Utility Model Application No. 60-33634 has a mounting hole in the pipe, etc. to be measured, and a metal The tip of the metal protection tube is inserted into the tube to be measured, and the base of the metal protection tube is fixed in the mounting hole.

Then, the lower end of the flexible tube attached to the lower part of the thermometer case is attached to the base of the metal protection tube, and the metal lead tube is connected to the lower end of the temperature display tube provided inside the case. A metal lead tube is inserted into the flexible tube and into the metal protection tube, and a metal temperature sensor is attached to the tip.

[The problem that the idea aims to solve]

A thermocouple thermometer as shown in FIG. 4 is suitable for measuring the temperature inside a pipe installed on the ground. However, thermocouple thermometers are not suitable for measuring the temperature inside pipes buried underground because they are sensitive to moisture and impact. If the structure is designed to protect the weak points, the structure will be complicated and expensive.

Furthermore, the devices shown in FIGS. 5 to 7 are also suitable for measuring the temperature inside a pipe installed on the ground, and when the display section 34 can be installed close to the temperature sensing section. However, it cannot be installed if the pipe is buried underground and is inserted from the standpipe 11.

By the way, after the gas pipe is buried underground, it is necessary to perform a pressure-tightness test on the gas pipe, so as shown in FIG. 12 and header 1
2, it is connected to a self-recording pressure gauge 17 via a high-pressure hose 16 to measure the pressure.
The header 12 is connected to an underground pipe 10. Therefore, a method was devised in which the temperature sensing part 21 connected to the automatic temperature recording part 7 was inserted into the header 12 to measure the temperature.

However, in this method, the header 12 is located far from the underground pipe 10, and the temperature inside the pipe cannot be accurately measured due to the influence of outside air temperature, etc., and as a result, accurate pressure-temperature correction cannot be performed.

In the liquid expansion type thermometer described in the microfilm of Utility Model Application No. 60-33634, the case of the thermometer can be bent by a flexible tube attached to its lower end. However, metal protection tubes cannot be bent.

Therefore, if the pipe whose temperature is to be measured is an underground pipe, and the location where the thermometer case can be installed and the underground pipe to be measured are located horizontally apart, thermal expansion It is not possible to install a type thermometer.

The present invention was developed in view of the above-mentioned issues, and it is possible to measure the temperature even if the installation position of the thermometer for measuring the temperature inside the pipe above ground and the position of the underground pipe to be measured are horizontally apart. The technical challenge is to create a device that can perform measurements.

[Means to solve the problem]

In the present invention, a lead wire 1 having a capillary-like through hole 2 inside is formed of stainless steel annealed to maintain flexibility, and one end of the lead wire 1 is formed into a large diameter cylindrical shape. The temperature-sensitive fluid storage section 3 is connected to allow communication between the through hole 2 and the inside of the temperature-sensitive fluid storage section 3, and the lead wire 1 is inserted into the center hole of the mounting flange 4 to connect the lead wire 1 and the flange. 4 is airtightly fixed, and an automatic temperature recording unit 7 is connected to the other end of the lead wire 1. Furthermore, a temperature sensitive A spiral metal flexible tube 6 is fitted onto the outside so that the fluid storage portion 3 is exposed, and the end of the flexible tube 6 is attached to the flange 4.
A spiral metal flexible tube 6 is inserted between the flange 4 and the automatic temperature recording section 7, the ends of the flexible tube 6 are attached to the flange 4 and the automatic temperature recording section 7, and the underground pipe 10 is installed.
A guide pipe 13 is provided that communicates with the temperature-sensitive fluid storage section 3.
Flexible tube 6 with lead wire 1 inserted
is removably inserted, the temperature-sensitive fluid storage section 3 is inserted into the underground pipe 10, and the flange 4 is attached to the guide pipe flange 14 provided at the end of the guide pipe 13 for in-pipe measurement. It was a self-recording temperature measuring device.

[Effect]

The present invention connects a vertical pipe 11 to an underground pipe 10, connects a guide pipe 13 to this vertical pipe 11,
A guide pipe flange 14 is attached to this.
When the temperature-sensitive fluid storage section 3 of the present invention is inserted into the guide pipe 13, the flexible tube 6 containing the lead wire 1 is inserted into the guide pipe 13.
It is inserted into the standpipe 11 from the bottom, bends according to the bend of the standpipe 11, and connects the temperature-sensitive fluid storage section 3 to the underground pipe 10.
It can be inserted inside. Therefore, the flange 4 is airtightly attached to the guide pipe flange 14, and air or nitrogen gas is pressurized into the underground pipe 10 for 24 hours or 48 hours.
Take temperature measurements for hours or longer. After the test is finished, the air inside the tube is exhausted and the flexible tube 6 is pulled out.

(Example) Fig. 1 shows a thermometer for measuring temperature inside a tube according to an example of the present invention, in which the lead wire 1 has an outer diameter of 2.3 mm.
mm, and a through hole 2 with a diameter of 0.2 mm is provided inside the suspension.
It is made of annealed stainless steel called 304. If the outer diameter of lead wire 1 is set to 2.3 mm or more, it becomes difficult to bend, but 3
It is possible up to mm. Also, if it is 2.3mm or less,
strength decreases.

A cylindrical temperature-sensitive fluid container 3 formed with an outer diameter of 18 mm and a length of 60 mm is connected to one end of the lead wire 1, and the through hole 2 and the inside of the temperature-sensitive fluid container 3 communicate with each other and are filled with mercury. However, other fluids or nitrogen gas may also be used. Further, the front and rear ends of the temperature-sensitive fluid storage section 3 are formed in the shape of a warhead with a protruding center portion, making it easy to insert and withdraw the thermosensitive fluid storage section 3 into the tube.

The lead wire 1 is inserted into the center hole of a mounting flange 4 having a diameter of 100 mm and a thickness of 16 mm, and the lead wire 1 and the flange 4 are brazed and fixed airtightly.

Further, an automatic temperature recording section 7 is connected to the other end of the lead wire 1.

Further, a spiral metal flexible tube 6 having an outer diameter of 6 mm is fitted onto the lead wire 1 between the temperature-sensitive fluid storage section 3 and the flange 4 so that the temperature-sensitive fluid storage section 3 is exposed. Then, the end of the flexible tube 6 is attached to the flange 4, and the spiral metal flexible tube 6 with an outer diameter of 6 mm is inserted between the flange 4 and the automatic temperature recording section 7. The ends of the flexible tube 6 are attached to the flange 4 and the automatic temperature recording section 7.

Further, the lead wire 1 between the flange 4 and the temperature-sensitive fluid storage section 3 has a length of 3 m, and the length of the lead wire 1 between the flange 4 and the automatic temperature recording section 7 is 2 m.

Then, as shown in FIG. 2, underground pipe 10
A standpipe 11 communicating with the inside of the underground pipe 10 is provided, and a header 12 is provided on the standpipe 11. A self-recording pressure gauge 17 is connected to the header 12 via a high-pressure hose 16, and a guide pipe 13
A guide pipe flange 14 is provided at the end of the guide pipe 13.

From the end of the guide pipe 13, the flexible tube 6 on the side of the temperature-sensitive fluid storage section 3 of the thermometer for measuring the temperature inside the tube, into which the lead wire 1 is inserted, is removably inserted into the temperature-sensitive fluid storage section. 3 is inserted into the underground pipe 10, and the flange 4 is attached and fixed to the guide pipe flange 14.

The flexible tube 6 incorporating the lead wire 1 of this embodiment has a bending angle θ of the standpipe 11.
At 45 degrees, there was no problem with insertion and withdrawal.

Furthermore, the means for fixing the lead wire 1 and the flange 4 may be by adhesion using resin, etc., and the flexible tube 6 can be installed in an airtight manner so that no load is placed on the lead wire 1. There's no need to do it.

[Effect of idea]

The present invention has a lead wire 1 on the temperature-sensitive fluid storage section 3 side.
Since the flexible tube 6 is externally fitted on the guide pipe flange 14, the underground pipe 1
The guide pipe flange 14 cannot be installed unless it is installed horizontally away from the guide pipe 13 and the underground pipe 10.
Even if the standpipe 11 communicating with is bent, the lead wire 1 and flexible tube 6 are bent,
It can be inserted into the guide pipe 13 and the standpipe 11, and the temperature-sensitive fluid storage section 3 can be inserted into the underground pipe 10.

Therefore, even if the installation position of the flange 4 etc. on the ground and the underground pipe 10 are horizontally separated, the thermometer for measuring the temperature inside the pipe can be installed inside the underground pipe 10.

Even if the distance between the underground pipe 10 and the guide pipe flange 14 is long or short, the temperature can be measured with one thermometer. (If the lead wire 1 and the flexible tube 6 are made long, the excess lead wire 1, etc. can be extended into the underground pipe 10 and the flange 4 can be attached, as shown in FIG. 2).

Furthermore, since the temperature-sensitive fluid storage section 3 is inserted directly into the underground pipe 10, the temperature-sensitive fluid storage section 3 directly contacts the fluid inside the underground pipe 10, and the fluid inside the underground pipe 10 It is possible to accurately measure the temperature of

[Brief explanation of the drawing]

Fig. 1 is a partially fragmented front view showing an embodiment of the present invention, Fig. 2 is a view of the device installed, Fig. 3 is a view showing the idea that is the basis of the present invention, and Figs. FIG. 7 is a diagram showing a conventional example. 1...Lead wire, 2...Through hole, 3...Temperature-sensitive fluid storage section, 4...Flange, 6...Flexible tube, 7...Automatic temperature recording section, 10...Underground pipe, 13... Guide pipe, 14... Guide pipe flange.

Claims (1)

[Scope of utility model registration request] Lead wire 1 with capillary-like through hole 2 inside
is made of stainless steel annealed to maintain flexibility, and a large-diameter cylindrical temperature-sensitive fluid storage section 3 is connected to one end of the lead wire 1 to connect the through hole 2 and the temperature-sensitive fluid storage section. The inside of the part 3 is communicated with each other, and the lead wire 1 is inserted into the center hole of the mounting flange 4 to fix the lead wire 1 and the flange 4 airtightly.
An automatic temperature recording section 7 is connected to the other end of the lead wire 1, and the temperature-sensitive fluid storage section 3 is exposed to the lead wire 1 between the temperature-sensitive fluid storage section 3 and the flange 4. In this way, the spiral metal flexible tube 6 is fitted onto the outside, the end of the flexible tube 6 is attached to the flange 4, and the spiral metal flexible tube is placed between the flange 4 and the automatic temperature recording section 7. The ends of the flexible tube 6 are attached to the flange 4 and the automatic temperature recording unit 7, and a guide pipe 13 communicating with the inside of the underground pipe 10 is provided. The flexible tube 6 on the hot fluid storage section 3 side into which the lead wire 1 has been inserted is removably inserted, the temperature sensitive fluid storage section 3 is inserted into the underground pipe 10, and the flexible tube 6 is inserted into the end of the guide pipe 13. The flange 4 is attached to the provided guide pipe flange 14.
A pipe temperature measuring device with a .