JP2530261Y2 - Gas seal valve for vertical furnace - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas seal valve in a raw material charging device for a vertical furnace.

[0002]

2. Description of the Related Art A vertical furnace such as a blast furnace is provided with a charging device for temporarily storing raw materials and the like and charging the raw material into the furnace. These charging devices have a hopper to maintain airtightness between the furnace and the inside of the furnace.
A seal valve is provided below the hopper.

FIG. 3 is a longitudinal sectional view of an example of a seal valve of a conventional vertical furnace. The valve plate 1 is attached to the arm 6 and the valve seat 2
Together, they constitute a seal valve. The arm 6 is rotatably mounted on the shaft 5, and opens and closes the valve plate 1 as needed. An annular sealing rubber 3 is fixed to the valve plate 1 by a fixing member 7 on the valve plate 1. When the valve plate 1 is closed, the sealing rubber 3 and the valve seat 2 are closed.
Are pressed against each other to maintain airtightness. In this conventional structure, as shown in FIG. 3, raw material dust in the hopper 8 adheres and accumulates between the valve plate 1 and the valve seat 2, and the life of the seal rubber 3 is remarkably shortened.

In order to solve such a problem, for example, as disclosed in Japanese Patent Application Laid-Open No. 62-182213, a raw material dust is coated with a wear-resistant and dust-resistant material so as not to adhere to a seal portion. Some include a valve seat made of a metal base material.

[0005]

However, even with the technique described in Japanese Patent Application Laid-Open No. 62-182213, when the seal valve is closed at the end of discharge, the raw material 9 is still being discharged with the last part still flush. It flows through the gap between the valve plate 1 and the valve seat 2. It takes a considerable amount of time to completely discharge the raw material 9 flowing as a flutter, but the valve is usually closed in the middle of the discharge due to the time schedule of the operation. Therefore, a part of the raw material 9 is sandwiched between the seal rubber 3 and the valve seat 2, and the raw material 9 bites into the seal rubber 3, which significantly deteriorates the gas sealing property of the seal valve and shortens the life of the seal rubber 3 significantly. Insufficient sealing of the gas seal valve is a major obstacle to the stable operation of the furnace. Therefore, the steel pipe of the seal rubber 3 and dust must be frequently removed manually.

[0006] However, since this operation can be performed only when the furnace is temporarily stopped, the loss in operation and maintenance caused by this is enormous, and improvement has been strongly desired. The present invention has been made to solve the above-mentioned problems, and its purpose is to provide a seal rubber 3 and a valve seat 2.
Another object of the present invention is to provide a gas seal valve which prevents raw material dust from penetrating between them, improves the sealing performance of the gas seal valve, and greatly improves the life of the seal rubber 3.

[0007]

The gas seal valve of the vertical furnace according to the present invention comprises a valve seat and a valve plate arranged at the outlet of a hopper of a raw material charging device, and a valve seat around the valve plate. In a gas seal valve of a vertical furnace composed of a sealing rubber attached so as to abut, a protection plate made of a flexible material is attached to an inner periphery of a valve seat, and the protection plate is attached to the valve seat and the valve plate. It is characterized in that it has a length to contact the valve plate before making contact.

[0008]

As described above, according to the present invention, when the gas seal valve is closed, the protective plate 4 is configured to contact the valve plate 1 before the valve plate 1 contacts the valve seat 2. Since the raw material dust is completely shut off by the protective plate 4 before closing, and does not flow down to the seal rubber 3, the sealing performance can be reliably maintained for a long time. Further, since there is no foreign matter such as a raw material between the seal rubber 3 and the valve seat 2, the seal rubber 3 is not damaged and the life is greatly improved.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below in detail with reference to the drawings. FIG. 2 is a sectional view showing the configuration of an embodiment of the present invention.
The same parts as those in FIG. 3 are denoted by the same reference numerals. FIG. 1 shows a state in which the valve plate of FIG. 2 is being closed. The valve plate 1 is attached to the arm 6 so as to be able to rotate slightly. The end of the arm 6 is rotatably mounted on the shaft 5 so that the valve plate 1 can be opened and closed with respect to the valve seat 2 by a driving device (not shown). The seal rubber 3 is annularly disposed so as to be able to contact and seal the convex portion 22 of the valve seat 2 when the valve plate 1 is closed, and is fixed to the valve plate 1 by a fixing member 7.

The valve seat 2 is provided with a protective plate 4 made of a flexible material which is inclined from the valve seat 2 toward the center of the valve plate 1 and is made of a flexible material, and the protective plate 4 is closed when the valve plate 1 is closed. Before the sealing rubber 3 contacts the valve seat 2, the protective plate 4
It is constituted so that it may contact. The operation method will be described with reference to FIG.

After the raw material 9 has been charged downward from the hopper 8, the arm 6 is rotated in the direction of the arrow to bring the valve plate 1 close to the valve seat 2. At this time, the last portion of the raw material 9 is still being discharged, and is flowing through the gap between the valve plate 1 and the valve seat 2. When the arm 6 is further rotated, the protection plate 4 attached to the valve seat 2 comes into contact with the valve plate 1 and is pushed by the protection plate 4 so that the protection plate 4 is pressed.
The raw material in the hopper 8 is rotated slightly along the
As a result, it is prevented from going to the seal rubber 3 of the valve seat 2.

On the other hand, the raw material 9 which has come out of the protective plate 4 before the protective plate 4 and the valve plate 1 come into contact with each other falls by gravity, and the sealing rubber 3
There is no raw material 9 above. In this state, the arm 6 is further rotated, and the sealing rubber 3 of the valve plate 1 is
To seal the hopper 8 and the inside of the furnace. Therefore, the raw material is not sandwiched between the sealing rubber 3 and the convex portion 22 of the valve seat 2 and the gas sealing property can be secured,
In addition, the life of the seal rubber 3 is significantly longer than that of the related art. It should be noted that the present invention is not limited to the above-described embodiment, and it is needless to say that various changes can be made without departing from the gist of the present invention.

[0013]

[Effects of the Invention] As described above, according to the present invention,
When the gas seal valve is closed, since the raw material does not flow into the seal portion by the protective plate 4, the raw material is not sandwiched between the seal rubber 3 and the convex portion of the valve seat 2, so that the gas sealing property can be ensured and the furnace can be operated. Since the life of the seal rubber 3 is greatly increased as compared with the conventional one, the number of temporary stoppages for the replacement of the seal rubber 3 is greatly reduced.
Furnace operation and maintenance costs can be significantly reduced.

[Brief description of the drawings]

FIG. 1 is a view showing a state in which a valve plate of a gas seal valve according to the present invention is being closed.

FIG. 2 is a sectional view showing the configuration of an embodiment of the present invention.

FIG. 3 is a longitudinal sectional view of an example of a conventional gas seal valve.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Valve plate 2 Valve seat 3 Seal rubber 4 Protective plate 5 Shaft 6 Arm 7 Fixing member 8 Hopper 9 Raw material 22 Projection of valve seat

Claims (1)

(57) [Scope of request for utility model registration] 1. A vertical furnace comprising a valve seat and a valve plate disposed at an outlet of a hopper of a raw material charging apparatus, and a seal rubber provided around the valve plate and abutting against the valve seat. In the gas seal valve, a protective plate made of a flexible material is attached to the inner periphery of the valve seat, and the protective plate has a length that comes into contact with the valve plate before the valve seat comes into contact with the valve plate. Gas seal valve for vertical furnaces.