JPH01209331A - Apparatus for measuring atmospheric pressure generated in construction - Google Patents

Abstract

PURPOSE:To accurately measure the atmospheric pressure generated in a construction, by inserting the leading end part of an elongated pipe whose internal space is filled with a high b.p. liquid in the construction along with a temp. detection part and connecting the rear end part thereof to a pressure detector. CONSTITUTION:The leading end part of a metallic elongated pipe 3 filled with a high b.p. liquid such as silicone oil or liquid paraffin is embedded in the cast frame 17 formed in a porous construction 15 composed of amorphous refractory or heat resistant concrete along with a thermometer composed of a thermocouple 10. The construction 15 is dried by heating the same from a surface 16. A plurality of the pipes 3 and a plurality of the thermocouples 10 are inserted according to the shape of the construction 15. The rear end parts of the pipes 3 are connected to a pressure detector 1 and the output thereof is inputted to a recorder 19. The rear ends of the thermocouples 10 are connected to a recorder 18 to continuously record pressure and temp., and the pressure and temp. generated in the execution body 15 are accurately detected. By this method, the explosion of the construction due to a rise in the pressure thereof is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an apparatus for measuring internally generated atmospheric pressure such as vapor pressure of a porous construction body such as a monolithic refractory or heat-resistant concrete.

[Conventional technology]

For porous construction bodies such as monolithic refractories and heat-resistant concrete,
Dry the constructed structure before use. However, during this drying, various gases, mainly steam, are generated inside the construction body, and for example, the construction body often explodes or internal defects occur due to an increase in the steam pressure. To prevent this, it is necessary to know the changes in vapor pressure and temperature inside the construction body during drying and adjust the drying conditions.

In order to measure this internal vapor pressure, there is a method in which one end of an elongated pipe with openings at both ends is provided in a porous construction body, and the other end is connected to a mercury manometer to measure the internal vapor pressure. However, since this method uses air as the pressure medium, accurate pressure measurements are impossible due to the compression of the air and the condensation of steam in the metal pipes.

In addition, American Ceramic used a strain gauge type pressure gauge instead of this mercury manometer, and in order to prevent pressure loss due to condensation of water vapor in the pipe, a heating coil was wound around the outside of the pipe to heat it.・Society (American Ceramic 5oc
iety) Vol, 63. No. 7 (1984)
pl), 905 et seq.

[Problem to be solved by the invention]

However, since this device also uses water vapor and air with extremely high compressibility as pressure media, it is impossible to detect instantaneous pressure fluctuations, and in order to obtain accurate vapor pressure, it is necessary to Measured values had to be corrected due to changes in temperature and volume, and it was theoretically impossible to measure true vapor pressure.

In addition, due to the structure of such equipment, it is necessary to increase the outer diameter of the pipe to about 6 cm, which causes external factors to be applied to the temperature of the construction body. There was also the problem that the steam temperature could not be directly measured.

The problem to be solved by the present invention is to solve the problems caused by conventional means when measuring the internal vapor pressure and temperature of monolithic refractories, heat-resistant concrete, etc. In other words, it is possible to obtain an accurate and responsive pressure measuring means by preventing pressure measurement errors and detection response delays caused by the volumetric compression of gases such as air with high compressibility and the condensation of water vapor in pipes. be.

[Means to solve the problem]

In the present invention, an elongated pipe whose hollow part is filled with a high boiling point liquid as a pressure medium is inserted into a construction body, and the pressure generated near the insertion tip is transferred to the other end through the high boiling point liquid filled in the pipe. The pressure is measured by transmitting the information to a pressure detector connected to the construction body, thereby making it possible to accurately measure the absolute value of the internal atmospheric pressure of the construction body.

Further, by providing an arbitrary temperature measuring means together with the pressure detector, it is possible to measure the temperature together with the pressure detection.

As the high boiling point liquid that is the pressure transmission medium, silicone oil, liquid paraffin, spindle oil, etc. can be used.

〔Example〕

1 and 2 show the connection state and cross section of the connection box of this measuring device.

Reference numeral 1 indicates a pressure detection device, specifically a strain gauge type pressure indicating transmitter, which is fixed to the box 2 with screws.

3 is SUS with a high boiling point liquid filled inside as a pressure medium
Made of metal such as, outer diameter 2~3mm, inner diameter 0.8~
It is an elongated vibrator with a length of 1.5 mm and a length of 1 to 3 m, with one end inserted into the construction body 15 and the other end reaching the pressure detection device 1.

When the elongated vibrator 3 has a length of 1 to 3 m, the inner diameter must be within 0.8 mm to 1.5 mm. If the diameter is less than 0.8 mm, the pressure loss resistance generated inside the construction body at the tip of the pipe will result in poor steam pressure transferability, and if the inner diameter is greater than 1.5 m+a, the internal volume of the pipe will increase and the internal Pressure transmission performance deteriorates due to the compressibility of the pressure medium filled in the pipe.

The elongated vibrator 3 has a connecting metal 4 joined by welding,
It can be connected to the connection box 2 with fixing screws 5.

All of the internal passages of the elongated vibrator 3 and the connection box 2 are filled with a high boiling point liquid pressure medium such as silicone oil or liquid paraffin, and the temperature at the tip of the elongated vibrator 3 inside the construction body increases as the pressure medium fills. When the boiling point of the high boiling point liquid is approached, the pressure medium in the metal pipe can be withdrawn by retracting the screw piston 6.

Reference numeral 7 denotes an O-ring, which prevents pressure medium from leaking from the gap between the threaded piston 6 and the connection box 2.

To fill the inside of the elongated vibrator 3 and the connection box 2 with pressure medium, connect a vacuum pump to the exhaust port 8 and open the stop valve 9 while drawing a vacuum to prevent the pressure medium from leaking from the tip of the elongated vibrator 3. However, it can be done.

FIG. 3 shows how a thermocouple 10 as a temperature measuring means is attached to an elongated vibrator 3.

Referring to the figure, the thermocouple 10 is preferably a sheathed thermocouple, which is a grounded or non-grounded type and has an outer diameter of 2.2 mm or less. When the outer diameter is 2.2 mm or more, the heat conduction as a sheath pipe becomes large, which causes external thermal factors to be introduced into the construction body when it is cast into the construction body. Slender pipe 3
A semi-solid substance 11 such as silicone grease is filled up to about 2 to 3 mm from the tip of the long pipe 3 during casting.
Prevents clogging caused by construction material entering the hollow part of the pipe.

The ends of the elongated pipe 3 and the sheathed thermocouple 10 are aligned, approximately 3
They are connected in parallel using fixing fittings 12 with an interval of a+m or less. The distance between the elongated pipe 3 and the sheathed thermocouple 10 is 3 mm.
If it becomes more than that, the deviation between the vapor pressure measurement position and the temperature measurement position becomes large. However, if the spacing is less than one city, it becomes difficult to fill the rods of the elongated pipe 3 and sheathed thermocouple 10 with porous material during casting, creating voids and causing the vapor pressure generated inside the construction body to dissipate. becomes.

FIG. 4 shows how the pressure detection device 1 is attached to the measurement stand 13 using a metal fitting 14. In the case of the present invention, the elongated pipe 3 is flexible, and the construction body and the frame can be installed at arbitrary intervals as shown in the figure, making it possible to accurately measure changes in internal pressure.

FIG. 5 is a diagram schematically showing the operating state of the entire apparatus of the present invention.

The elongated pipe 3 for pressure measurement and the sheathed thermocouple 10 are placed in the casting frame 17 at any position from the heating surface 16 of the porous construction body 15.
50 mIm from the heating surface.

It is better to complete the actual installation of the elongated pipe 3 and the sheathed thermocouple 10 before casting the construction material into the casting flask 17. The electrical signal generated by the sheathed thermocouple 10 is continuously recorded on a recorder 18. The steam pressure generated in the construction body 15 into which the elongated pipe 3 is cast is the elongated pipe 3.
The pressure is transmitted to the pressure detection device 1 via the pressure medium therein, where it is digitally displayed, and is extracted as an electrical signal, which can be continuously recorded on the recorder 19.

FIGS. 6 and 7 show the measurement results.

In the case of the figure, a refractory castable having the properties shown in Table 1 is cast into the casting flask 17 shown in Fig. 5, and
After curing for a period of time, the heating surface 16 was heated with a gas burner to raise the temperature.

The measurement position was 30.50.70 mm from the heating surface, and casting was performed so that the tips of the elongated pipe 3 and the sheathed thermocouple 10 were located at predetermined positions. Pressure is atmospheric pressure 0.
Although it is shown as 0 kg/cut, it can be seen that there was no clogging of the elongated pipe 3, and that changes in internal temperature and internal steam pressure as the temperature of the heating surface increased were measured in a regular manner.

In this embodiment, the internally generated gas is explained using steam as an example, but it goes without saying that the pressure of other generated gases can be measured by the apparatus of the present invention.

Furthermore, as a measure against explosions when repairing furnaces using monolithic refractories, the device of the present invention is installed, and when the measured pressure reaches a pressure value that would cause an explosion, the heating by the heating means is stopped or reduced, thereby When the internal (steam) pressure drops, an automatic control system for explosion prevention can be configured that starts heating again.

Table 1 〔Effect of the invention〕 The following effects can be achieved by the present invention.

(1) Continuously responsive and accurate measurement data of internally generated atmospheric pressure such as internal vapor pressure at any position in a porous construction body during drying can be obtained.

(2) By using a temperature measuring device in combination with an internally generated atmospheric pressure measuring device, it is possible to grasp the internal vapor pressure and temperature at the same time and at the same point, set an appropriate drying pattern to prevent a sudden increase in internal vapor pressure, and measure various porous holes. It becomes possible to confirm the influence of the raw materials of a quality construction body on the generation of internal steam pressure.

[Brief explanation of the drawing]

Each of the accompanying drawings shows an embodiment of the invention. FIGS. 1 and 2 show the connection state in the connection box of this measuring device. FIG. 3 shows how the temperature measuring means is attached to the elongated pipe. FIG. 4 shows how the pressure detection device is attached to the measurement stand. FIG. 5 schematically shows the operating state of the entire apparatus of the present invention. FIGS. 6 and 7 show measurement results using the apparatus of the present invention. l: Pressure detection device 2: Connection box 3: Elongated pipe 4: Connection metal 5: Fixing screw
6: Threaded piston 7: O-ring 8: Exhaust port

Claims (1)

[Claims] 1. Internal generation of a construction body characterized by having an elongated pipe whose rear end is connected to a pressure detector and whose internal space is filled with a high boiling point liquid as a pressure transmission medium. Barometric pressure measuring device. 2. It has an elongated pipe whose rear end is connected to a pressure detector and whose internal space is filled with a high boiling point liquid as a pressure transmission medium, and a temperature measuring means is provided at the tip of the elongated pipe. A device for measuring the internal atmospheric pressure of a construction body, characterized by: