JP2533904B2 - Internally generated air pressure measuring device for construction body - Google Patents

Description

TECHNICAL FIELD The present invention relates to an internally generated atmospheric pressure measuring device for measuring vapor pressure of a porous construction body such as an irregular shaped refractory or heat resistant concrete.

[Conventional technology]

For porous constructions such as irregular refractories and heat-resistant concrete, the constructions should be dried before use. However, during the drying, various gases, mainly steam, are generated inside the construction body, and for example, the construction body often explodes or causes internal defects due to an increase in vapor pressure thereof. In order 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 the internal vapor pressure, there is a system in which one end of an elongated pipe having openings at both ends is provided in a porous work body and the other end is connected to a mercury manometer to measure the internal vapor pressure. However, in this method, since air is used as the pressure medium, accurate pressure measurement is impossible due to the compression of air and the condensation of vapor in the metal pipe.

In addition, a strain gauge type pressure gauge was used instead of this mercury manometer, and in order to prevent pressure loss due to the condensation of water vapor in the pipe, a heating coil was wound on the outside of the pipe so that heating was possible.・ Society (American Ceramic Society) Vol.63, No.7
(1984) pp.905 et seq.

[Problems to be Solved by the Invention]

However, since this device also uses steam and air with a very high compression rate as the pressure medium, it is not possible to detect instantaneous pressure fluctuations, and in order to obtain an accurate steam pressure, the steam in the pipe must be Since it was necessary to correct the measured values due to changes in temperature and volume, it was impossible in principle to measure the true vapor pressure.

In addition, due to the structure of such a device, the pipe outer diameter is 6 m.
It is necessary to make it thicker to about m, which causes an external factor to the temperature of the construction body, and it is not possible to directly measure the steam temperature because it is not possible to provide a temperature measuring means such as a thermocouple on the steam pressure measuring pipe. There was also.

The problem to be solved in the present invention is to eliminate the problems caused by the conventional means when measuring the internal vapor pressure and temperature of irregular shaped refractories, heat-resistant concrete and the like. That is, it is possible to obtain an accurate and responsive pressure measuring means by preventing pressure measurement error and delay in detection response caused by volume compression of gas such as air having a large compression rate and condensation of water vapor in a pipe. is there.

[Means for Solving the Problems] The present invention is directed to a connection box that fills an internal space with a pressure transmission medium and uses the internal opening as an internal passage, and an elongated pipe rear end portion whose front end on the heating surface side is open. Is a pressure detector and a screw type piston that are connected to each other through an internal passage of a connection box, a pressure medium filling exhaust port, and a stop valve that shuts off the exhaust port and the internal passage.

The present invention inserts a slender pipe (hereinafter referred to as slender pipe) having an open front end on the heating surface side filled with a high-boiling liquid as a pressure medium in the hollow body (hereinafter referred to as a slender pipe), and the pressure of the generated atmospheric pressure in the vicinity of the insertion tip, The pressure is measured by transmitting it to a pressure detector connected to the other end through the high boiling point liquid filled in the pipe, thereby accurately measuring the absolute value of the internally generated atmospheric pressure of the construction body. Is made possible.

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.

Silicon oil, liquid paraffin, spindle oil, or the like can be used as the high-boiling-point liquid that is the pressure transmission medium.

〔Example〕

1 and 2 show a connection state and a cross section in a connection box of the present measuring apparatus.

Reference numeral 1 denotes a pressure detection device, specifically, a strain gauge type pressure indicating transmitter, which is fixed to a connection box 2 with a screw.

3 is SUS filled with a high boiling point liquid as a pressure medium.
A slender pipe made of metal such as 2 to 3 mm in outer diameter, 0.8 to 1.5 mm in inner diameter and 1 to 3 mm in length is inserted into the construction body at one end and reaches the pressure detection device 1 at the other end.

When the length of the elongated pipe 3 is 1 to 3 m, the inner diameter needs to be within 0.8 mm to 1.5 mm. 0.8 m
If it is less than m, the pressure drop resistance of steam generated inside the work piece at the tip of the pipe results in poor vapor pressure pressure transmissibility, and if the inner diameter exceeds 1.5 mm, the internal volume of the pipe increases,
The compressibility of the pressure medium filled inside deteriorates the pressure transmission.

The elongated pipe 3 is joined to the connection metal 4 by welding and can be connected to the connection box 2 with a fixing screw 5.

All the internal passages of the elongated pipe 3 and the connection box 2 are filled with a pressure medium of a high boiling point liquid such as silicone oil or liquid paraffin, and the temperature of the tip of the elongated pipe 3 inside the construction body is filled as a pressure medium. When the boiling point of the high boiling point liquid approaches, the screw type piston 6 can be retracted to retract the pressure medium in the metal pipe.

An O-ring 7 prevents the pressure medium from leaking from the gap between the screw type piston 6 and the connection box 2.

For filling the pressure medium into the elongated pipe 3 and the connection box 2, a vacuum pump is connected to the exhaust port 8 and the stop valve 9 is opened while sucking the vacuum to prevent leakage of the pressure medium from the tip of the elongated pipe 3. While you can do it.

FIG. 3 shows how the thermocouple 10 as the temperature measuring means is attached to the elongated pipe 3.

Referring to the figure, the thermocouple 10 is a sheath thermocouple, and it is desirable that the ground type or non-ground type has an outer diameter of 2.2 mm or less. If the outer diameter exceeds 2.2 mm, the heat conduction as a sheath pipe will become large, and when cast into the construction body, it will cause thermal external factors to enter inside the construction body. From the tip of the elongated pipe 3 to the inside of about 2 to 3 mm, a semi-solid material 11 such as silicone grease is packed to prevent clogging due to the work material entering the hollow portion of the elongated pipe 3 during casting. .

The ends of the elongated pipe 3 and the sheath thermocouple 10 are approximately 3 mm.
Connect in parallel with fixing metal fittings 12 at the following intervals. If the distance between the elongated pipe 3 and the sheath thermocouple 10 exceeds 3 mm, the deviation between the vapor pressure measurement position and the temperature measurement position becomes large. However, if the distance is 1 mm or less, it becomes difficult to fill the rod of the elongated pipe 3 and the sheath thermocouple 10 with the porous material during casting,
Voids are generated, which causes the vapor pressure generated inside the construction body to dissipate.

Fig. 4 shows a fitting for mounting the pressure detector 1 on the measuring stand 13.
14 shows a mounting mode. In the case of the present invention, an elongated pipe 3
Is flexible, and the location of the construction body and the stand can be
As shown in the figure, they can be freely installed at arbitrary intervals, and accurate changes in internal pressure can be measured.

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

The elongated pipe 3 for pressure measurement and the sheath thermocouple 10 are inserted from the heating surface 16 of the porous construction body 15 at an arbitrary position through the casting frame 17 at a position about 50 mm from the heating surface. The actual installation of the elongated pipe 3 and the sheath thermocouple 10 should be completed before the work material is cast into the casting frame 17.
The electrical signal generated by the sheath thermocouple 10 is continuously recorded in the recorder 18. The vapor pressure generated in the construction body 15 in which the elongated pipe 3 is cast is transmitted to the pressure detection device 1 via the pressure medium in the elongated pipe 3, where it is digitally displayed and taken out as an electric signal. It is possible to record continuously on the recorder 19.

 6 and 7 show the measurement results.

In the case of the figure, a refractory castable having the properties shown in Table 1 was cast into the casting frame 17 shown in FIG. 5, and after curing at 25 ° C. for 20 hours, the heating surface 16 was heated and heated by the gas burner. The measurement position was 30, 50, 70 mm from the heating surface, and casting was performed so that the elongated pipe 3 and the tip of the sheath thermocouple 10 were located at predetermined positions. The pressure is indicated by the atmospheric pressure as 0.0 kg / cm ² , but there is no clogging of the elongated pipe 3, and the changes in the internal temperature and the internal vapor pressure due to the temperature rise of the heating surface are
It can be seen that the measurements are made uniformly.

In this embodiment, steam is used as an example of the internally generated gas, but it is needless to say that the pressure of other generated gas or the like can be measured by the apparatus of the present invention.

Furthermore, as a measure against explosion when repairing a kiln with an irregular shaped refractory, the device of the present invention is attached, and when the measured pressure reaches a pressure value that causes explosion, heating by the heating means is stopped or reduced, and It is possible to configure an automatic explosion-proof control system that starts heating again when the internal (vapor) pressure drops.

[Effects of the Invention] The following effects can be achieved by the present invention.

(1) Accurate measurement data with continuously responsiveness of the internally generated air pressure such as the internal vapor pressure at an arbitrary position in the porous construction during drying can be obtained.

(2) By using a temperature measuring means in combination with the internally generated atmospheric pressure measuring device, the internal vapor pressure and temperature at the same time and at the same point can be grasped, an appropriate drying pattern for preventing a rapid increase in the internal vapor pressure can be set, and various porosities can be obtained. It is possible to confirm the influence of the raw material of the quality construction body on the generation of internal vapor pressure.

[Brief description of drawings]

Each accompanying drawing is a diagram showing an embodiment of the present invention. 1 and 2 show the connection state in the connection box of the 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. 6 and 7 show the measurement results by the device of the present invention. 1: Pressure detector, 2: Connection box 3: Elongated pipe, 4: Connection metal 5: Fixing screw, 6: Screw type piston 7: O-ring, 8: Exhaust port 9: Stop valve, 10: Thermocouple 11: Semi-solid, 12: Fixing bracket 13: Measuring stand, 14: Mounting bracket 15: Porous work, 16: Heating surface 17: Casting frame, 18, 19: Recorder

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Yukihiro Suekawa 1-1 Higashihama-cho, Hachimansai-ku, Kitakyushu, Fukuoka Kurosaki Ceramics Co., Ltd. (56) Reference JP-A-62-206424 (JP, A) JP-A-SHO 54-118883 (JP, A) Actually opened 57-190444 (JP, U)

Claims (1)

(57) [Claims] 1. A connection box in which an internal space is filled with a pressure transmission medium, and the internal space serves as an internal passage, and a rear end of an elongated pipe whose front end on the heating surface side is filled with the pressure transmission medium and the inside of the connection box. Measurement of internally generated air pressure of a non-standard refractory, heat-resistant concrete, etc. equipped with a pressure detector, screw type piston and exhaust port for pressure medium filling port connected in a passage, and a stop valve that shuts off the exhaust port and the internal passage apparatus.