JPS6145105B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an outward-opening bleeder valve that is installed at the top of a blast furnace and is used as a pressure relief valve from a high-pressure vessel, a gas diffusion valve, and the like.

An example of a conventionally used externally opening type bleeder valve is explained with reference to Figs. 1 to 3.
In the figure, a indicates a gas discharge pipe provided at the upper part of the blast furnace, and a valve mounting frame b and a valve seat c are fixed to the upper end of the pipe as shown in FIG. A support d is provided on one side of the valve mounting frame b, and an intermediate portion of the lever e is pivotally supported on the support d by a shaft f.

A traction wire g is attached to one end of the lever e, and a wire h is attached to the other end of the lever e. As shown in FIGS. 1 and 3, a counterweight i is pulled by the wire h. It's hanging. A valve cover k is attached to the lever e between the shaft f and the wire h by a pin j, and when the lever e rotates clockwise about the shaft f in FIG. It is designed to come into close contact with valve seat c.

In this conventional outward-opening bleeder valve, a counter is used to obtain the reaction force against the high-pressure gas in the gas discharge pipe a and the surface pressure of the valve cover k to maintain airtightness between the valve cover k and the valve seat c. The dead weight of the weight i is used, but in order to minimize the dead weight of the counterweight i, the length between the pin j of the lever e and the wire h is lengthened, and the dead weight of the counterweight i is It's starting to give you several times more power. Therefore, the length of lever e is 2 to 3 m.
is long, and the counterweight i is also 1~
It usually weighs about 3 tons, and the rigidity of the lever e must be strong enough to withstand the bending moment due to the weight of the counterweight i, so it must have a large cross-sectional performance, so it is necessarily heavy. I become confused. As a result, manufacturing costs are high, a large-capacity crane is required for installation and replacement, and the bleeder valve is installed at the top of the gas discharge pipe a about 100 m above the ground.
There is usually only an inspection deck around 4 to 5 meters wide, so handling the heavy counterweight i is difficult and there is a risk of it falling.
It had some dangerous flaws.

Furthermore, when the blast furnace gas is dissipated, the gas may burn at the bleeder valve outlet, but since the wire h attached to the tip of the lever e to suspend the counterweight i is located above the valve outlet. , the wire h may break or the lever e may burn and bend due to the heat of the combustion gas.
If the counterweight i were to fall due to such a situation, there is a high possibility that personal injury would occur to workers working in the casting bed around the lower part of the blast furnace. Furthermore, since the lever e and counterweight i move each time the valve cover k is opened and closed, work around the bleeder valve is extremely dangerous unless sufficient communication is made. The valve tightening force applied to the valve cover k by the counterweight i is necessary for the gas internal pressure only when the valve is closed, but is unnecessary when the valve is opened, and the counterweight i increases the force for opening the valve. As a result, when opening the valve cover k in an emergency, the manual winch that pulls the pulling wire g requires a large amount of force, and the time required to open and close the valve becomes long.

The present invention eliminates the above-mentioned drawbacks, reduces the size and weight of the bleeder valve, requires less force to open the valve, reduces manufacturing costs, and improves safety by moving the valve drive mechanism away from the dissipated gas flow. With ivy,
A valve cover support lever has a valve cover that seals the valve body rotatably attached to its tip, and a middle part is rotatably attached to a bracket provided on the side of the valve body, and one end is rotatably attached to the bracket. an attached drive link; a connection link rotatably connected to the other end of the drive link via a connecting shaft; and the other end rotatably attached to the base end of the valve cover support lever; and the drive link. and a valve opening/closing drive mechanism connected to the drive link, and one of the drive link and the connection link is hollow and has a built-in spring attached to the compression force adjustment device, and the spring allows the connection shaft to be connected to the other link. The gist of this invention is an externally opening type bleeder valve, which is characterized in that it is configured to be pressed toward the outside.

Next, an embodiment of the present invention will be described with reference to FIG. 4. A cylindrical valve body 2 is fixed to the upper end of the gas discharge pipe 1, and a seat ring 3 is further fixed to the upper end of the valve body 2. A gas sealing material 4 is attached to the upper surface of the seat ring 3.

A vertical bracket 5 is attached to the outer surface of the valve body 2, near the upper end of which an intermediate portion of a valve lid support link 6 is pivotally supported by a shaft 7.
Tip of valve cover support link 6 (right end in Fig. 4)
A valve lid 9 is supported by a valve lid support shaft 8 so as to be rotatable within a certain range. When the valve cover support link 6 rotates clockwise about the shaft 7, the valve cover 9 comes into close contact with the gas sealing material 4 with uniform surface pressure. The upper end of a connecting link 11 is pivotally connected to the base end (left end in FIG. 4) of the valve cover support link 6 by a shaft 10. A shaft 12 is fixed to the lower end of the connecting link 11.

Near the lower end of the bracket 5, the base end of a drive link 14 is pivotally connected by a shaft 13, and the drive link 14 is formed with a slit 15 extending in the longitudinal direction to near the tip, as shown in FIG. has been done. A male threaded rod 16 is embedded in the bottom of the slit 15 so as to protrude in the longitudinal direction, and a nut 17 is screwed into the rod 16. A bearing 18 is fitted into the slit 15 so as to be able to slide along the slit 15, and a spring 19 is interposed between the nut 17 and the bearing 18. The shaft 12 fixed to the lower end of the connection link 11 described above is also movably inserted into the slit 15 toward the tip side. The shaft 12 is supported on a bearing 18, as shown in FIGS. 5 and 6, and is pressed toward the distal end of the drive link 14 by a spring 19.

The bracket 5 has a shaft 21 at the base end of the cylinder 20.
The tip of the piston rod 22 (see FIG. 5), which projects from the cylinder 20, is pivoted near the tip of the drive link 14 by a shaft 23.

Now, when the drive link 14, the connection link 11, and the valve cover support link 6 are in the state shown by the solid line in FIG. When the cylinder 20 is discharged and pressurized oil is supplied to the head side, the cylinder 20 expands and rotates the drive link 14 counterclockwise about the shaft 13. When the drive link 14 rotates counterclockwise, the upper end of the slit 15 pulls the shaft 12 downward, displacing the connecting link 11 and shaft 10 downward, and moves the valve cover support link 6 counterclockwise around the shaft 7. The valve cover 9 is rotated to open the valve cover 9 as shown by the broken line in FIG. Even at this time, the bearing 18, shaft 12, and connection link 11 remain pressed against the tip side of the slit 15 by the spring 19, so the connection link 11 and drive link 14 are the same as the four-bar link. do the work.

When the valve cover 9 is open as shown by the broken line in FIG. 4, when pressure oil is supplied to the rod side of the cylinder 20 and the drive link 14 is rotated clockwise, the shaft
2 is the valve cover support link 6 from point X to point Y in Fig. 4.
Move while rotating. When the shaft 12 reaches the Y point, the valve cover 9 comes into close contact with the seat ring 3, and the valve cover support link 6 no longer rotates clockwise. After that, drive link 1
4 rotates clockwise, the spring 19 is compressed and the shaft 12 moves from the Y point to the Z point. In this state, the spring 19 is compressed by the distance from point Z' to point Z. When the drive link 14 rotates clockwise and the shaft 12 comes to a position slightly closer to the valve body 2 than the straight line connecting the shafts 10 and 13, the drive link 14 hits the stopper 24 and stops.

When the valve cover 9 is closed, when the gas pressure inside the valve body 2 rises above the set pressure, the valve cover 9 is pushed up and the valve cover support link 6 rotates counterclockwise. , will push down the bearing 18 and further compress the spring 19. For this reason, the rigidity (spring constant) of the spring 19 is set to match the set pressure at which the valve cover 9 is pushed up.
When changing the set pressure, the position of the nut 17 is adjusted without changing the spring 19.

FIG. 7 shows the balance of forces when the drive link 14 rotates clockwise, where T: rotation torque required for the drive link 14 F: tangential component of force applied to the shaft 12 r: shaft 12 Radius of movement locus R: reaction force θ of spring 19: angle of intersection between connecting link 11 and drive link 14, then T=F×r=2Rsinθ/2×r.

On the other hand, as shown in FIG. 8, if the initial reaction force applied to the spring 19 is Ri, and the reaction force of the spring 19 when the valve cover 9 is closed and the spring 19 is compressed is Rm, then the rotation of the drive link 14 is The required torque is as shown in FIG. 8C, and reaches its maximum at the valve closing starting point. In this way, the drive link 14
The output of the cylinder 20 that rotates is determined by the initial reaction force of the spring 19, and the force against the gas pressure inside the valve body 2 can be ignored because the tangential component F approaches zero as the valve closes. Become. Therefore, the output of the cylinder 20 can be small.

In the embodiment shown in FIGS. 4 and 5, the cylinder 20 and the piston rod 22 are used as devices for rotating the drive link 14 about the shaft 13, but the device for rotating the drive link 14 is As a small counterweight, pinion
A rack-type cylinder, a motor with a speed reducer, etc. can also be used. It is also possible to provide an emergency manual mechanism. Further, although an example has been shown in which the drive link 14 is provided with a slit to provide a spring and a sliding bearing mechanism, the connection link 11 may also be provided with a slit.

Since the present invention is configured as described above, there is no need to use long levers or heavy counterweights, so it is possible to reduce the weight and size, the manufacturing cost is low, and installation and replacement are easy. Since it is compact, the space around the valve is small, the driving part is small, and safety is increased.

In addition, since the drive mechanism for the valve lid is located on the back side of the valve lid when it opens next to the valve body, it is not affected by the hot gas being discharged and there is no risk of deformation or damage, and the capacity of the actuator for opening and closing the valve is also reduced. It has the effect of being small.

Furthermore, if a male threaded rod 16 and a nut 17 are provided for the spring 19 as shown in FIG. 5, the set pressure can be easily adjusted.

[Brief explanation of the drawing]

Fig. 1 is a side view of an example of a conventional external opening type bleeder valve, Fig. 2 is an enlarged vertical sectional view of the main part of Fig. 1, Fig. 3 is a plan view of Fig. 2, and Fig. 4 is the present invention. A partially cut away side view of one embodiment, FIG. 5 is a vertical sectional view of the drive link, and FIG. 6 is a side view of FIG.
7 is an explanatory diagram of force balance, and FIG. 8 is a graph showing changes in the connection direction component of force, spring reaction force, and drive link rotation torque. 2... Valve body, 3... Seat ring, 5... Bracket, 6... Valve cover support link, 9... Valve cover, 1
1... Connection link, 12... Axis, 14... Drive link, 15... Slit, 19... Spring,
20...Cylinder.

Claims (1)

[Claims] 1. A valve cover support lever with a valve cover for sealing the valve body rotatably attached to its tip and a middle part rotatably attached to a bracket provided on the side of the valve body, and one end rotatably attached to the bracket. a drive link attached to the drive link; a connection link rotatably connected to the other end of the drive link via a connecting shaft, and the other end rotatably attached to the base end of the valve cover support lever; It consists of a valve opening/closing drive mechanism connected to a link, and one of the drive link and the connection link is hollow and contains a spring attached with a compression force adjustment device, and the spring allows the connection shaft to be connected to the other link. An outward-opening bleeder valve characterized by being pushed toward the link.