JPH09279226A - Device for sealing lance for vacuum degassing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sealing device of a lance for a vacuum degassing which can surely prevent the stickiness of a hollow elastic body to the lance and the breakage of the hollow elastic body. SOLUTION: This sealing device 10 of the lance for vacuum degassing is arranged with a groove-state hollow elastic body housing part 13 surrounding the inserted lance 18 in a lance inserting hole 12 at the top part of a vacuum degassing vessel 11 and set with the hollow elastic body 14 providing the air through-hole in the interval with the hollow elastic body housing part 13. In the air through-hole, a swith valve 15 connected with a compressed air source 16 at the time of sealing the lance 18 and connected with a vacuum generating source 17 at the time of non-sealing the lance 18, is arranged.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lance sealing device for blowing oxygen, fuel and powder in vacuum in a vacuum degassing equipment for molten steel such as RH and DH.

[0002]

2. Description of the Related Art In vacuum degassing equipment for molten steel such as RH and DH, the molten steel is exposed to a vacuum state for refining, and a lance insertion port is provided in the upper part of the furnace body to insert the lance from this portion. It was used to blow oxygen, fuel and powder into the furnace. Since the inside is a vacuum, the lance insertion port and the lance were sealed to prevent air from entering from the outside, but it is necessary to raise and lower the lance, and the sealing performance of normal gland packing is Since it is bad, for example, as described in JP-B-49-22486,
A sealing device using an air tube that expands by containing compressed air has been proposed. FIG. 4 shows a general vacuum degassing lance seal device 50 according to a conventional example having substantially the same structure as that of the above-mentioned publication. And an annular hollow elastic body 53 made of a rubber tube or the like is provided inside, compressed air is introduced into the hollow elastic body 53 through an electromagnetic valve 54, and the hollow elastic body 53 is expanded to form a lance 55. I was trying to seal it. When the lance 55 is pulled out from the vacuum degassing tank 51, or when the lance 55 is moved up and down while being inserted in the vacuum degassing tank 51, the solenoid valve 54 is operated to operate the hollow elastic body 53.
The air inside was exhausted to the outside.

[0003]

However, in the vacuum degassing lance seal device 50 shown in FIG. 4, when the electromagnetic valve 54 is opened to evacuate the air in the hollow elastic body 53, the hollow elastic body 53 is released. Since the air inside does not fall below atmospheric pressure and the inside of the vacuum degassing tank 51 is vacuum, the lower portion of the hollow elastic body 53 is pulled downward due to the vacuum, and further the lance 55 as shown in FIG. There is a problem in that the hollow elastic body 53 is abnormally worn or even broken when the lance 55 is moved up and down. The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a vacuum degassing lance seal device capable of reliably preventing the hollow elastic body from closely contacting the lance and preventing the hollow elastic body from being damaged. .

[0004]

According to the present invention, there is provided a semiconductor device comprising:
The vacuum degassing lance seal device described above is provided with a groove-shaped hollow elastic body storage portion surrounding a lance to be inserted in an upper portion of a vacuum degassing tank, and an air inlet / outlet port is provided in the hollow elastic body storage portion. In a lance seal device for vacuum degassing, in which a hollow elastic body is disposed, the air inlet / outlet is connected to a compressed air source when the lance is sealed and connected to a vacuum generation source when the lance is not sealed. The valve is connected. The vacuum degassing lance seal device according to a second aspect is the vacuum degassing lance seal device according to the first aspect, wherein the vacuum generation source is an ejector operated by compressed air. And
A vacuum degassing lance seal device according to a third aspect is the vacuum degassing lance seal device according to the first aspect, wherein the vacuum generation source includes a vacuum degassing tank. In addition,
In the present invention, the term "vacuum" includes not only a substantially complete vacuum state but also a state in which the pressure is sufficiently reduced so that a reduced pressure state is created using an ejector.

In the lance seal device for vacuum degassing according to claims 1 to 3, the air inlet and outlet of the hollow elastic body are
A switching valve is connected to the compressed air source when the lance is sealed and connected to a vacuum generation source when the lance is not sealed. Therefore, when sealing is performed, compressed air is introduced into the hollow elastic body, but when the seal is released and the lance is moved up and down, the hollow elastic body is connected to a vacuum generation source to remove air inside. Therefore, since the hollow elastic body is accommodated in the hollow elastic body accommodating portion, the hollow elastic body is separated from the periphery of the lance, so that the hollow elastic body is pulled by the lance when the lance is moved up and down, and the hollow elastic body is abnormally worn or damaged. Absent. Particularly, in the vacuum degassing lance seal device according to the second aspect, since the vacuum generation source is an ejector operated by compressed air, a special vacuum pump or the like is unnecessary. Further, in the vacuum degassing lance seal device according to the third aspect, since the vacuum generation source is a vacuum degassing tank, the vacuum source can be used more efficiently.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION Next, referring to the attached drawings, an embodiment in which the present invention is embodied will be described to provide an understanding of the present invention. FIG. 1 is an explanatory view of a vacuum degassing lance seal device according to the first embodiment of the present invention.
2 is an explanatory diagram of a vacuum degassing lance seal device according to a second embodiment of the present invention, and FIG. 3 is an explanatory diagram of a sealed state.

As shown in FIG. 1, a vacuum degassing lance seal device 10 according to a first embodiment of the present invention is a hollow elastic body provided in a lance insertion port 12 at an upper portion of a vacuum degassing tank 11. The housing portion 13, the hollow elastic body 14 housed in the hollow elastic body housing portion 13, an electromagnetic valve 15 as an example of a switching valve connected thereto, a compressed air source 16 connected to the electromagnetic valve 15, and Ejector 1 which is an example of a vacuum source
7 is provided. These will be described in detail below.

The hollow elastic body accommodating portion 13 is made of water-cooled metal, refractory or the like as in the conventional case, has a lance insertion port 12 into which a lance 18 is loosely fitted, and is further inserted. A groove 20 which surrounds 18 and accommodates the hollow elastic body 14 is formed. A guide hole 21 is provided at the back of the hollow elastic body storage section 13 so that air can be sent to or exhausted from the hollow elastic body 14 stored in the groove 20. The hollow elastic body 14 is made of a flexible material such as rubber and is provided with an air inlet / outlet port 19 at its back, and a first pipe of the solenoid valve 15 is provided by a pipe 22 passing through the outlet hole 21.
It is connected to the connection port A.

The ejector 17 is connected to the second connection port B of the solenoid valve 15, the third connection port C of the solenoid valve 15 is connected to the vacuum port of the ejector 17, and the fourth connection port D of the solenoid valve 15 is connected. Is connected to a compressed air source 16. Therefore,
When compressed air is introduced into the hollow elastic body 14 to seal the lance 18, the solenoid valve 15 is switched from the state shown in FIG. 1 to connect the compressed air source 16 and the hollow elastic body 14 to each other. Inflate. As a result, the seal of the lance 18 becomes substantially complete as shown in FIG. 3 (A), and the atmosphere does not enter from this portion.

On the other hand, in order to raise the lance 18, it is necessary to expand the inner surface of the hollow elastic body 14. In this case, the solenoid valve 15 is switched so that it is as shown in FIG. Thereby, the air from the compressed air source 16 is ejected by the ejector 1.
7, the solenoid valve 15 is attached to the vacuum port of the ejector 17.
The hollow elastic body 14 is connected via. As a result, as shown in FIG. 3B, the hollow elastic body 14 is recessed and accommodated in the groove 20 of the hollow elastic body accommodating portion 13.
As a result, the lance insertion opening 12 is sufficiently opened,
The lance 18 can be raised and lowered freely.

A second embodiment of the vacuum degassing lance seal device 25 according to the present invention will be described with reference to FIG. 2. The same components as those of the first embodiment are designated by the same reference numerals. Is attached and detailed description thereof is omitted.
Vacuum degassing lance seal device 2 according to this embodiment
5, the third connection port C of the solenoid valve 15 is connected to the vacuum degassing tank 11. Therefore, the solenoid valve 1 shown in FIG.
In the state of No. 5, since the air inlet / outlet port 19 of the hollow elastic body 14 is connected to the vacuum degassing tank 11 via the solenoid valve 15, the hollow elastic body 14 collapses as shown in FIG. 18 can be taken out freely. When compressed air is fed into the hollow elastic body 14, the solenoid valve 15 is switched to supply air from the compressed air source 16 to the hollow elastic body 14 via the solenoid valve 15. As a result, FIG.
Around the lance 18 can be sealed as shown in FIG.
In FIG. 2, the second connection port B of the solenoid valve 15 is blindly plugged.

[0012]

As is apparent from the above description, the vacuum degassing lance seal device according to the first to third aspects can surely prevent the hollow elastic body from coming into close contact with the lance. Breakage can be prevented and therefore the service life of the hollow elastic body is significantly extended. Particularly, in the vacuum degassing lance seal device according to the second aspect, since the hollow elastic body is evacuated by using the ejector, the device is simple and maintenance and inspection are easy. Further, in the vacuum degassing lance seal device according to the third aspect, since the vacuum generation source is taken from the vacuum degassing tank, a special device is not required and the device is extremely simple.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a vacuum degassing lance seal device according to a first embodiment of the present invention.

FIG. 2 is an explanatory diagram of a vacuum degassing lance seal device according to a second embodiment of the present invention.

FIG. 3 is an explanatory diagram of a sealed state.

FIG. 4 is an explanatory diagram of a vacuum degassing lance seal device according to a conventional example.

FIG. 5 is an operation explanatory view of a vacuum degassing lance seal device according to a conventional example.

[Explanation of symbols]

10 Vacuum degassing lance seal device 11 Vacuum degassing tank 12 Lance insertion port 13 Hollow elastic body storage part 14 Hollow elastic body 15 Electromagnetic valve (switching valve) 16 Compressed air source 17 Ejector (vacuum generation source) 18 Lance 19 Air inlet / outlet port 20 groove 21 lead-out hole 22 piping 25 vacuum degassing lance seal device A first connection port B second connection port C third connection port D fourth connection port

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Ryuji Fujita 46-59 Nakahara, Tobata-ku, Kitakyushu City, Fukuoka Prefecture 59 Nippon Steel Plant Design Co., Ltd. 59 Nippon Steel Corporation Machinery & Plant Division

Claims (3)

[Claims] 1. A lance insertion port at the top of a vacuum degassing tank,
A vacuum degassing lance seal device is provided in which a groove-shaped hollow elastic body storage portion is provided surrounding an inserted lance, and a hollow elastic body having an air inlet / outlet port is arranged in the hollow elastic body storage portion. A lance seal device for vacuum degassing, which is connected to a compressed air source when the lance is sealed, and is connected to a vacuum generation source when the lance is not sealed. 2. The lance seal device for vacuum degassing according to claim 1, wherein the vacuum generation source is an ejector operated by compressed air. 3. The lance seal device for vacuum degassing according to claim 1, wherein the vacuum source is a vacuum degassing tank.