JPS5935574Y2 - bubble generator - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a bubble generator, and more particularly to an instrument for feeding hydrogen gas into molten metal in the form of fine bubbles.

Conventionally, hydrogen gas was pumped into the molten metal to reduce the oxides in the molten metal, and the method for this was to drill a large number of small holes at the end of a gas pipe with a sealed tip, and then to reduce the oxides in the molten metal. This is done by feeding hydrogen gas into the air supply pipe and generating fine bubbles of hydrogen gas in the molten metal through the small holes.

However, since the air pipe is made of heat-resistant metal such as titanium, and the small hole in the air pipe that serves as the hydrogen gas discharge port is very small, it has the disadvantage that its usage limit is quickly reached. At the same time, these heat-resistant metals are also expensive, and improvements in this area have been desired.

In view of the above-mentioned conventional circumstances, the purpose of the present invention is to provide a bubble generator with a long service life. It is characterized by a removable cover.

Hereinafter, embodiments of the present invention will be explained with reference to the drawings. Figures 1 and 2 show a first embodiment of the bubble generator of the present invention, and Figure 1 shows a partially cutaway view of the bubble generator of the present invention. Front view showing,
FIG. 2 is a front sectional view showing the state in which the bubble generator is used, and the bubble generator consists of an air pipe 1 and a covering sleeve 2.

The air pipe 1 is formed into a tubular shape using a heat-resistant metal such as titanium,
A plug 3 is airtightly fitted and fixed to the tip thereof, and an appropriate number of discharge ports 4 are provided around the tip discharge portion 1'.

The covering sleeve 2 is formed of porous lava into a cylindrical shape with a bottom, and the sleeve 2 and the air pipe 1 are fit together, and the depth of the sleeve 2 is at least such that a discharge port 4 is provided around the circumference. The length of the discharge portion 1' of the air pipe 1 is assumed to be 1'.

Then, the tip of the air pipe 1 is inserted into the covering sleeve 2, and both 1 and 2 are removably fixed with bolts 5.

Therefore, in order to deoxidize the molten metal 6, as shown in FIG.
This is done by inserting a bubble generator that has been gradually heated beforehand.

That is, the hydrogen gas 8 sent from the hydrogen cylinder through the air pipe 1 at a predetermined pressure is discharged through an appropriate number of discharge ports 4 at the tip.
It diffuses through the countless pores 9 of the covering sleeve 2, and is released into the molten metal 6 as countless fine bubbles 8' from the surface 2' of the covering sleeve 2, and slowly The oxides in the molten metal 6 are reduced while the molten metal 6 rises to .

On the other hand, the lava that forms the covering sleeve 2 has a high degree of fire resistance.
Although it is less susceptible to molten metal6 than conventional heat-resistant metals,
If the pores 9 on the sleeve surface 2' are crushed due to long-term use, you can scrape them off with a glider or the like, or remove the covering sleeve 2 from the air pipe 1 and attach a new covering sleeve 2 to the bolt 5. Attach it with.

Next, the second embodiment of the present invention will be explained with reference to FIG.
The figure shows a front sectional view of the bubble generator of the present invention, and shows the air pipe 10.
1 and a covering sleeve 102.

The air pipe 101 consists of an air pipe main body 101a formed into a tubular shape from a heat-resistant metal such as titanium, and an outer cylinder 101b that covers and protects the main body 101a. A plug 103 and a discharge port 104 similar to those in the first embodiment are provided.

In addition, the outer cylinder 101b is made of dense lava and has connecting steps 10 at both ends.
1b', 101b'' are formed in a cylindrical shape, and an appropriate number of them are connected to the discharge portion 101' in the main body 101a.
Remove and insert.

The covering sleeve 102 is formed in the same manner as in the first embodiment and is attached to the main body 101a, and has a stepped portion 1 of a predetermined depth on its upper end surface.
02' is provided around the circumference and engaged with the outer cylinder 101b.

Therefore, in order to deoxidize the molten metal 6, a bubble generator is inserted into the hot water as in the first embodiment, and hydrogen gas 8 is introduced into the air pipe 101.
I'll send it to.

The deoxidizing operation in this case is the same as in the first embodiment, but the air pipe main body 101a is covered with an outer cylinder 101b made of lava, so it does not come into contact with the molten metal 6.

Note that the discharge port in the first and second embodiments is not limited to a small hole, but may be a long hole parallel to the axis of the air pipe or a long hole in the circumferential direction. It is also optional to use this opening as a discharge port without sealing it, and to insert the tip of the air pipe for a predetermined length in an airtight manner into the upper part of the covering sleeve formed in the shape of a cylinder with a bottom, and to fix the two removably.

It is also optional to form the air pipe main body from ceramic.

As described above, in this invention, the discharge part of the air pipe is removably covered with porous lava, so the porous lava's excellent heat resistance and heat insulation properties prevent the discharge part from deteriorating. Since there is no need to make the discharge port into a very small hole, it is possible to provide a bubble generator with a significantly longer service life than conventional ones.

Furthermore, when the covering sleeve deteriorates, it is only necessary to replace it, and the air pipe made of expensive heat-resistant metal such as titanium can be used for a long period of time.The structure of the air pipe is similar to that of the second embodiment. This further increases this effect.

Therefore, the intended purpose can be achieved.

[Brief explanation of the drawing]

The figures show the first and second embodiments of the bubble generator of the present invention. Figure 1 is a partially cutaway front view of the bubble generator of the first embodiment of the present invention, and Figure 2 shows its usage state. FIG. 3 is a front sectional view of a bubble generator according to a second embodiment of the present invention. In the figure, 1,101 is an air pipe, 1', 101' is a discharge part, and 2,102 is a covering sleeve made of porous lava.

Claims (1)

[Scope of utility model registration request] A bubble generator made by removably covering the discharge part of an air pipe with porous lava.