JPS6256841A - Method and device for measuring gas flow rate in air-permeable brick - Google Patents

Abstract

PURPOSE:To prevent gas from leaking and trespassing except at a gas intake and an outlet and to measure the gas flow rate in a single brick easily and accurately by covering the air-permeable brick with a soft sheet material except the gas intake and outlet parts and bringing the sheet material into contact with the brick with the gas pressure. CONSTITUTION:The lower opening part 15 and an upper opening part covered with a lid body 4 are provided to the external cylinder 1 of a gas flow rate measuring instrument and an internal cylinder 2 made of the soft sheet material is provided except to the intake and outlet of the brick 8 to be inspected to cover the brick 8 with the internal cylinder 2. A brick positioning stopper 3 is arranged at the opening part 15 and the brick 8 is set in the internal cylinder 2 and sealed with a lid body 40 and an airtight right 11. Further, a compressed air supply device 5 is connected to a pipe connection part 14 arranged on the side wall of the external cylinder 1. Compressed air is supplied from this device into the external cylinder 1 and the sheet material of the internal cylinder 2 is brought into contact with the brick 8 to prevent gas from leaking and trespassing except at the gas intake and outlet, thereby measuring the gas flow rate accurately by a gas flow meter 63 on the side of a test gas supply device 6.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a method for controlling the gas flow rate of a permeable brick such as a brick constituting a porous plug for blowing inert gas attached to the bottom of a ladle for molten metal refining. The present invention relates to a method and apparatus for measuring.

Conventional technology and its problems Generally, when refining molten metal, a porous refractory, that is, a porous plug, is attached to the bottom of a molten metal container, and an inert gas is blown into the molten metal through the plug. This stirs the molten metal to remove impurities from the metal, causing the impurities to float.

Such a porous plug is, for example, as shown in FIG.
The outer periphery of the porous breathable refractory or brick (91) is covered with a metal case (92), a gas introduction pipe (93) is connected to the metal case, and a stirring gas is supplied from the pipe. and pass through the vent in the refractory (91),
Microbubbles are ejected from the upper end of the plug into the molten metal.

There is also a porous plug as shown in FIG. This plug has a castable refractory (95) installed around the outer periphery of a porous breathable refractory (94), and the entire body is connected to a gas introduction pipe (94).
96) is covered with a metal case (97).

Such a porous plug must be able to pass a certain amount of gas ω in order to achieve its intended use.

Conventionally, such gas flow rate measurement or inspection has been performed after the porous plug is completed, that is, after the plug is completed by attaching a metal case and a gas introduction pipe to a refractory.

However, when performing gas flow measurements on such finished products, if the gas flow rate is measured outside of the acceptable range (failure), it is important to know whether this is due to the breathable refractory itself or due to other causes. It was difficult to determine.

Furthermore, if the plug fails, the time and cost required to complete the plug are wasted, resulting in a large loss.

Such problems exist not only in the case of porous plugs as described above, but also in various articles having gas-permeable refractories as constituent elements.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a method for easily and accurately measuring the gas flow rate of the permeable brick mass of an article having permeable bricks as a component, and an apparatus for implementing the method, thereby The object is to determine in advance whether the product itself is acceptable or not, and to eliminate as much waste as possible in producing a rejected finished product.

Means for Solving the Problems The object of the present invention is to cover the part of a permeable brick except for the gas inlet/outlet part with a soft sheet material, and apply gas pressure to the sheet material to tightly adhere the sheet material to the brick. By letting
Gas flow rate measurement of a permeable brick, characterized in that gas is flowed between the gas inlet and outlet parts and the gas flow m is measured while preventing gas leakage and gas circulation in parts other than the gas inlet and outlet parts. [method] and [an outer cylinder with openings at both ends, an inner cylinder made of a soft sheet material that surrounds the brick to be inspected, leaving the gas inlet/outlet part, and is fitted into the outer cylinder, and both ends are connected to the outer cylinder. The inner cylinder is airtightly connected to the cylinder, the inner cylinder faces the opening at one end of the outer cylinder, the brick positioning stopper is provided at the U end, and the lid is detachably attached to the opening at the other end of the outer cylinder. the lid body capable of fixing a brick to be inspected between the stopper and the stopper when attached to the opening; a device for supplying pressurized gas between the inner and outer cylinders; This is achieved by a gas flow measuring device for a permeable brick, characterized in that it is equipped with a device for supplying gas through a gas flow meter between the gas flowmeter and a device for supplying gas through a gas flowmeter.

The soft sheet material used in the method and apparatus is a sheet such as a soft synthetic resin sheet such as a soft rubber sheet or a soft nylon sheet, which has substantially no air permeability, and is not subject to gas pressure such as compressed air pressure. A flexible sheet material that can adhere closely to the surface of the breathable brick to be inspected can be used.

According to the device of the present invention, the brick to be inspected is inserted into the inner tube until it comes into contact with the brick positioning stopper, and then a lid is attached to the outer tube, and the brick to be inspected is fixed between the lid and the stopper. . Next, pressurized gas (for example, compressed air) is introduced between the inner and outer cylinders, and the inner cylinder is brought into close contact with a portion of the brick to be inspected excluding the gas inlet/outlet portion.

In this state, a test gas is introduced between the lid and the brick, and the test gas passes through the vent hole in the brick and escapes from the opposite side to the outside of the brick. During this time, the gas flow rate is measured with a flow meter. Once the gas flow measurement has been completed, the lid is removed from the outer cylinder and the bricks are at least partially pushed out of the inner cylinder by suitable means and received by an operator or other equipment.

EXAMPLE Hereinafter, an example of the present invention will be described with reference to the drawings, taking as an example the measurement of gas flow rate of a permeable brick in a porous plug provided at the bottom of a ladle for refining molten metal.

FIG. 1 shows an example of a gas flow measurement device. The device is
Outer cylinder (1), inner cylinder (2) brick positioning stopper (3)
, a lid body (4), a compressed air supply device (5), an inert gas supply device for testing (6), and a brick setting spindle/butcher (7).

The outer cylinder (1) is arranged in the vertical direction and has openings at the upper and lower ends. There is also a compressed air supply pipe connection (1) on the side wall.
4).

The inner cylinder (2) is made of a soft rubber sheet and has an inverted truncated cone shape, and is sized so that the truncated cone-shaped brick to be inspected (8) can be completely accommodated in an inverted state. (1) is included. The upper end of the inner cylinder (2) is hermetically coupled to a ring 11) that is airtightly fitted into the upper end of the outer cylinder (1), and is airtightly connected to the outer cylinder (1) via the ring (11). It looks like it was worn out. The lower end of the inner cylinder (2) is hermetically connected to a portion (12) of the lower end of the outer cylinder (1) that extends laterally toward the center of the cylinder and then rises slightly upward. The rising ring-shaped portion serves as a brick positioning stopper (3). In the illustrated example, the hollow part (15) of the stopper (3) is also the lower end opening of the outer cylinder (1).

The lid (4) is detachably attached to the upper end of the outer cylinder (1) by means of a screw, and has a brick holding part (41) and a test gas supply vibe connection part (42).

Note that (13) and (43) in the figure are O-rings for airtight sealing.

The compressed air supply device (5) has a pressure of about 1 to 1
A compressed air source (51) capable of supplying compressed air at a high pressure of 0 kg/Cl12, an air regulator (52), and a vibrator connection (1) between the regulator (52) and the outer cylinder (1).
4> via an air valve (53).

The device (5) also includes an exhaust valve (55). Test gas supply device (6) includes a gas source (61) and regulator (62) that supply a predetermined pressure of test inert gas, and a pipe connection (42) between the regulator (62) and the lid (4). A vibrator (65) is provided which connects the two via a gas flow meter (63) and a valve (64).

The brick setting spindle and button (7) is
It is provided below the lower end opening of the outer cylinder (1) and is supported so as to be able to rise and fall on a base (10) that supports the outer cylinder (1). The spindle/button has an idling roller <71> at its lower end.
), and is raised by a lever device (72) on the base that comes into contact with this roller part, and the upper end can enter into the inner cylinder (2), and when the lever is released, it descends by its own weight. It looks like this.

The gas flow rate measurement of the brick to be inspected (8) is performed as follows.

First, remove the lid (4) from the outer cylinder (1), and then
(72) to raise the spindle (7) into the inner cylinder (2), and insert the brick (8) into the inner cylinder. This brick (8) is once supported by a spindle (7), and the spindle (7) is slowly lowered to allow the brick (8) to be supported by the stopper (3). After that, the lid (4) is screwed onto the outside 19I (1), and the brick (8) is held down by the brick holding part 41) of the lid (4). Then the device (
5) Open the air valve (53) inside, supply compressed air to the pressurizing chamber (20) formed between the inner and outer cylinders, apply pressure to the outer periphery of the inner cylinder (2), and brick the inner cylinder (2). (8
) in close contact with the outer periphery of the In this way, the test gas becomes a brick (
8) Achieve a state where there is no risk of the gas going around or leaking outside the gas inlet/outlet part.

Next, close the valve (64) in the mounting M (6) and close the lid (4).
A test gas is supplied to the space (4) between the brick (8) and the test gas, which passes through the vent in the brick and flows out from the lower end opening (15) of the outer cylinder. During the flow of this test gas, the gas flow m of the brick is read with a flow meter (63).

When the reading of the gas flow rate is completed, the valve (64) in the device (6) is closed, and the valve (5) in the device (5) is closed.
3) Close the door and open the exhaust valve (55). In this way, compressed air is released from the chamber (20), the lid (4) is removed from the external station (1), the lever 7) is raised by stepping on the lever (72), and the brick ( 8) is pushed upward from the inner cylinder (2) and the brick is taken out to complete the inspection. According to the above method and apparatus, the test gas is a brick (8)
/r) Since it does not go around or leak into the @ surface, the gas flow rate can be measured accurately and easily.

Effects of the Invention As described above, the present invention provides a method for easily and accurately measuring the gas flow rate of a single permeable brick in an article having a permeable brick as a groove member, and an apparatus for carrying out the method. In addition, it is possible to determine in advance whether the permeable brick itself is acceptable or not, thereby significantly reducing the waste of manufacturing rejected finished products.

[Brief explanation of the drawing]

FIG. 1 is an overall schematic cross-sectional view showing essential parts of an example of the device of the present invention, and FIGS. 2 and 3 are perspective views showing examples of porous plugs, respectively. (1)...Outer cylinder, (15)...Outer cylinder lower end opening (one end opening of the outer cylinder),
(2)... Inner cylinder made of soft sheet material, (20)... Pressure chamber between inner and outer cylinders, (3)...
・Brick positioning stopper, (4)... Lid, (5)... Compressed air supply device, (6)... Test gas supply device, <63)... Gas flow meter, <7) ...Brick setting spindle/button, (8)...Brick to be inspected. Figure 1 Figure 2 Figure 3

Claims (2)

[Claims] (1) By covering the part of the brick to be inspected excluding the gas inlet/outlet part with a soft sheet material and applying gas pressure to the sheet material to bring the sheet material into close contact with the brick, the part other than the gas inlet/outlet part is A method for measuring a gas flow rate of a permeable brick, characterized in that the flow rate of the gas is measured by flowing gas between the gas inlet and outlet parts while preventing gas leakage and gas circulation. (2) An outer cylinder with openings at both ends, and an inner cylinder made of a soft sheet material that surrounds the brick to be inspected, leaving the gas inlet/outlet part, and is fitted into the outer cylinder, and both ends are connected to the outer cylinder. The inner cylinder is airtightly connected to the outer cylinder, a brick positioning stopper is provided at the end of the inner cylinder facing the opening at one end of the outer cylinder, and a lid is removably attached to the opening at the other end of the outer cylinder. The lid body is capable of fixing a brick to be inspected between the stopper and the stopper when attached to the opening, a device for supplying pressurized gas between the inner and outer cylinders, and a device for supplying pressurized gas between the lid body and the brick. A gas flow rate measuring device for a permeable brick, comprising: a device for supplying a test gas through a flowmeter.