JPS6032092Y2 - Bleeder valve for blast furnace - Google Patents

Description

[Detailed description of the invention] The present invention relates to the improvement of a bleeder valve for blast furnaces, and more specifically, it is configured to enable a reliable gas seal by allowing the vertical movement of the valve body to be performed almost linearly when opening and closing. This invention relates to a bleeder valve for blast furnaces.

In recent years, blast furnaces have been operated under high pressure to improve productivity and lower the fuel ratio.

Since the top of the furnace is particularly exposed to high pressure during this high-pressure operation, a bleeder valve is attached to the upper end of the gas riser pipe installed at the top of the furnace for safety in the event of an abnormality and for venting gas during wind breaks. .

In other words, this bleeder valve opens when the pressure at the top of the furnace becomes abnormally high to prevent the pressure inside the top of the furnace from increasing abnormally.
This prevents damage to the furnace body.

The opening operation described above uses a hydraulic cylinder or the like to pull down the lever on the opposite side of the weight when the wind is off, thereby opening the valve body. However, in the event of a high pressure abnormality, the valve body pushing blade due to internal pressure overcomes the biasing force of the weight and opens the valve body naturally. Become.

By the way, the above-mentioned bleeder valve currently in use has a structure as shown in FIG. 1, for example.

That is, in FIG. 1, 1 is a valve body in the shape of an inverted truncated cone, which is placed on a valve seat 3 provided at the upper end of a gas riser pipe 2.
A rod 4 is integrally provided at the lower end of the valve body 1, and this rod 4 is inserted into a valve guide 5 provided within the tube 2 to serve as a positioning guide.

Further, the valve body 1 is connected to a cover 7 via a link 6, and the lever 7 is supported by a lever mount 8 provided on the pipe 2 so as to be freely rotatable about a fulcrum pin 9.

A counterweight 10 is provided at one end of the lever 7, and a drive wire 11 is connected to the other end, and the tip of the wire 11 is connected to a hydraulic cylinder 12.

With such a conventional configuration, in the illustrated state shown by the solid line in the figure, the valve body 1 is placed on the valve seat 3 by the biasing force of the counterweight 10, and is in a closed state.

Here, when the pressure inside the furnace top becomes abnormally high, the valve body pushing blade due to the internal pressure is rotated in the direction of arrow A against the biasing force of the counterweight 10.

This rotation causes the valve body 1 to rise and open, and the gas in the furnace top is released from the gas riser pipe 2 through the gap between the valve body 1 and the valve seat 3. However, as the valve body 1 rises, the rod 4 rises while being guided by the valve guide 5.

By the way, in such a conventional example, the lever mounting pin 13 and the valve body mounting pin 14 of the link 6 move as shown by imaginary lines in FIG. ,
It moves toward the fulcrum pin 9 side with respect to the center line of the gas riser pipe 2, that is, the valve guide 5.

For example, at the position of the imaginary line, the center of the valve body mounting pin 14 has moved by a distance X from the center line, and this movement causes the valve body 1 to tilt with respect to the center line.

This inclination causes the rod 4 to incline with respect to the valve guide 5,
As a result, bending of the rod 4 and wear of the valve guide 5 occur, as well as poor levelness when the valve body 1 is closed, which in turn makes gas leakage more likely to occur when the valve body 1 is closed. This was not desirable in terms of blast furnace maintenance.

In order to solve these problems, the present invention has a link mechanism configured so that the valve body moves almost linearly without tilting when the valve is opened and closed. The description will be given based on the accompanying drawings following the figure.

In FIG. 2, a valve body 15 is placed on a valve seat 17 provided at the upper end of the gas riser pipe 16, and a rod 18 integrally provided at the lower end of the valve body 15 is inserted into the pipe 16. It is guided by a valve guide 19 provided.

Reference numeral 20 denotes an opening/closing lever for the valve body 15, which is rotatably supported by a lever mount 21 provided on the pipe 16 around a fulcrum pin 22, and has a counter urchin and a lever 23 at one end, and a lever 23 at the other end. connects a wire 24, and connects the wire 24 to a hydraulic cylinder 25.

The valve body 15 and the lever 20 are connected by a link 26, and this link 26 has a center portion that connects the valve body 15 to the lever 20.
The mounting part 27 protruding from the top of 5 and the valve body mounting pin 29,
Further, at the upper end, the lever 20 is connected to the mounting portion 28 of the lever 20 by a lever mounting pin 30, respectively.

Further, the pipe 16 is provided with an auxiliary link frame 31, and the auxiliary link 31 is attached to the frame 31 by an auxiliary link airway pin 32.
3 is supported at one end, and the other end is connected to the lower end of the link 26 by a mounting pin 34.

Therefore, in the illustrated state, the valve body 15 is closed, but when the furnace top pressure rises abnormally, the valve body pushing blade due to the internal pressure overcomes the biasing force of the counterweight, and the valve body 15 opens naturally.

Here, the dimension between the center points between the aforementioned pins 22 and 30 is a1, and the dimension between the pins 32 and 34 is b1.
If the dimension between pins 29 and 34 is c1 and d is the dimension between pins 29 and 34, the length is set so that a:b=d:c.

In this way, when the lever 20 is rotated around the pin 22 with each pin position set as shown in FIG.
When the pins 34 each take circular arc trajectories in the direction of the mouth with the pin 32 as the center, the trajectories of the pin 29 that is integral with the valve body 15 become as shown by the solid line A in the figure, and within the range of the stroke H, there is no significant displacement. It becomes almost linear.

In the present invention, the rotation range of the lever 20 is set so that the stroke of the valve body 15 is within the range of this dimension H.

Note that if the trajectory of the pin 14 in the conventional connection structure shown in FIG. 1 is taken as the trajectory from the point of the pin 29 in FIG. Then, the trajectory will be such that it approaches the fulcrum pin 9 side.

As explained in the embodiments above, the present invention consists of a link provided between a valve opening/closing lever and a valve body that are rotatable around a fulcrum pin, and an auxiliary link that is rotatable around a fulcrum pin. a link, the central part of the link is connected to the valve body with a valve body attachment pin, the upper end is connected to the valve opening/closing lever with a lever attachment pin, and the lower end is connected to the auxiliary link with an auxiliary link attachment pin. In addition, the ratio of the distance between the fulcrum pin and the lever mounting pin and the distance between the auxiliary link mounting pin and the auxiliary link fulcrum pin is the same as the ratio of the distance between the valve body, the mounting pin and the auxiliary link mounting pin, and the distance between the valve body mounting pin and the lever mounting pin. By rotating the link and the auxiliary link in conjunction with the opening/closing operation of the valve body by the rotation of the valve opening/closing lever, the movement of the valve body can be made into a nearly linear motion. There is no inclination in the support guide part of the body, and its wear and tear is eliminated.

Therefore, horizontal defects when closing the valve body are eliminated.
It is an extremely useful device that can perform reliable gas sealing, and is especially useful as a bleeder valve for blast furnaces, which has the role of sealing high-pressure gas and acting as a safety valve in the event of abnormally high pressure.

[Brief explanation of the drawing]

Fig. 1 is a partially sectional side view of the conventional example, Fig. 2 is a partially sectional side view of the embodiment of the present invention, Fig. 3 is a sectional view of the link portion, and Fig. 4 is a partially sectional side view of the conventional example. It is an explanatory view showing the same effect explanation and comparison with the conventional one. 15 is a valve body, 17 is a valve seat, 20 is a valve opening/closing lever, 22 is an air suspension pin, 26 is a link, 29 is a valve body mounting pin, 30 is a lever mounting pin, 32 is an auxiliary link fulcrum pin, 33 is an auxiliary link, 34 is the auxiliary link mounting pin.

Claims (1)

[Scope of utility model registration request] A link is provided between the valve opening/closing lever and the valve body, which is rotatable around a fulcrum pin, and an auxiliary link is rotatable around the fulcrum pin, and the central part of the link is attached to the valve body. The upper end is pivotally connected to the valve body with a pin, the upper end is pivotally connected to the valve opening/closing lever with a lever mounting pin, the lower end is connected to the auxiliary link with an auxiliary link mounting pin, and the distance between the fulcrum pin and the lever mounting pin is and the distance between the auxiliary link mounting pin and the auxiliary link fulcrum pin are configured to be the same,
A bleeder valve for a blast furnace, characterized in that a link and an auxiliary link are rotated in conjunction with the opening/closing operation of the valve body by rotation of the valve opening/closing lever, so that the movement of the valve body is also caused to move substantially linearly.