JPS6018425Y2 - Blower branch pipe for vertical furnace - Google Patents

Description

[Detailed description of the invention] This invention relates to a blower branch pipe for a vertical furnace, which sufficiently absorbs displacement within the system due to thermal expansion, pressure, etc., and allows the waist blowpipe to be attached and detached without any leakage of hot air. It is quick and easy.

The air to the vertical furnace is blown into the vertical furnace from the tuyere through the air blowing branch pipes that branch out from the hot air annular pipe.

The positional relationship between the vertical furnace body and the hot air annular pipe changes in different relative positions due to the thermal expansion and pressure fluctuations of the shell of each part, and also due to changes in these over time, so it is necessary to absorb these changes. In addition, it is necessary to have a branch pipe with a structure that prevents hot air leakage.

By the way, in the conventional structure, for example, as shown in FIG. is equipped with a gimbal type telescopic tube 6, and an upper bent tube 7.
It is connected to the hot air annular pipe 8 via.

The blow pipe 1 and the down pipe 5 are connected by a spherical joint 9 which is tightened by the bolts on both sides.

That is, this blower branch pipe was designed to absorb dimensional changes in each part by the slippage of the spherical surface of the blowpipe tip and the spherical joint of the downcomer pipe, and by the angle change of the gimbal type telescoping pipe.

However, recently, as the temperature and pressure of the air blowing has increased, the environment in which the air blowing branch pipe is used has become even more severe, and therefore, the spherical joint requires a large contact pressure to prevent air leakage.

In addition, the spherical joint of the down-pipe has a larger required slip angle to absorb the thermal expansion of each part compared to the spherical joint at the tip of the blow-pipe, so the spherical part of the down-pipe does not slide as theoretically, creating gaps and causing problems such as air leakage. Problems started to arise.

In other embodiments, the air blower has a structure that can absorb changes in relative position that occur within the air blowing branch pipe system by using two gimbal type telescopic pipes and a spherical joint at the tip of the blow pipe, or a universal type telescopic pipe and a spherical joint at the end of the blow pipe. Branch pipes have been developed, but all of these have the disadvantage of being more flexible than necessary, making the waist structure complicated, making them expensive, and having a wide range of flexibility, causing troubles due to expansion and contraction of the pipe and red heat. It had the following problems.

In order to solve these problems, the present invention has been developed to replace the spherical joint of the downcomer pipe in the conventional blower branch pipe (shown in Figure 1) with a hinge type that has the same function as a spherical joint and can be freely angularly displaced in one direction only. It is an object of the present invention to provide a blower branch pipe for a vertical furnace, which uses an expandable pipe to absorb necessary and sufficient dimensional changes in various parts with a simple structure, and eliminates leakage of hot air.

Next, the present invention will be explained based on an embodiment shown in FIG.

The blow pipe 10 is tightened using a hardware 11 such as a vise containing a spring, and the blow pipe spherical surface 13 is fixed to the tuyere 12.The lower part of the down pipe 14 is a hinge type that can be angularly displaced only in one direction. A telescopic pipe 15 is provided, and a gimbal-type telescopic pipe 16 that can be angularly displaced in any direction in the circumferential direction is provided above the downpipe 14, and a hot air annular pipe 18 is provided through an upper part pipe 17.
be combined with

Therefore, in the side direction, the two-link structure with three rotation centers can absorb the movement of the hot air annular tube and the thermal expansion of each part, and in the front direction, the angular displacement of the gimbal type telescopic tube and the spherical surface of the blow pipe tip can be absorbed. By rotating, it is possible to follow changes in the relative position of the hot air annular tube and the slats.

To explain the above with a diagram, as shown in the side view of Fig. 3a, when the hot air annular pipe 18 and the blow pipe spherical surface 13 move as shown by the broken line, and the blow pipe and the down pipe thermally expand, Relative position changes can be absorbed by the angular displacement of the blowpipe spherical surface 13, the hinge type telescopic tube 15, and the gimbal type telescopic tube 16, as shown by the broken line.

In addition, as shown in the front view of Figure 3, with respect to the movement of the hot air annular pipe 18 in the front direction, the hinge type telescopic pipe 1
5 can be absorbed only by the angular displacement of the gimbal type telescopic tube 16 and the rotation of the blow pipe spherical surface 13 without any angular displacement (the third
In Figures a and b, the solid line shows the center line before thermal expansion, and the broken line shows the center line of the blast branch pipe after thermal expansion and absorption of relative position changes.

) Therefore, although the present invention has an extremely simple configuration, it has a necessary and sufficient function to absorb all the relative positional changes that occur around the air blower branch pipe.

Further, the blow pipe 10 shown in FIG. 2 and the hinged telescopic tube 15 are connected by using a taper grooved flange 19 and a cotter bolt 20 and a cotter bolt 21 having a shape that can match the tapered groove of the flange, as shown in FIG. 4a. By the way, Kottarpol! -20 is set on the flange 19, the centers of the flanges are self-aligned, and the blow pipe can be quickly and easily attached and detached.

Furthermore, as shown in the cross-sectional view in Figure 4, the flanges 19 and 24 are made into a stamp type, and a metal heat shield ring 22 for blocking radiant heat is inserted into the inner surface, and the outside thereof is
A gas seal gasket 23 is provided to shut off the fluid, and the pin 2
The hot air can be stably sealed for a long period of time by setting the bolt 20 supported by the bolt 5 and driving the bolt 21.

As described above, although the present invention has an extremely simple mechanism, it solves the problem of air leakage, and when the blow pipe needs to be replaced due to operational or maintenance reasons for the vertical furnace, the work of attaching and detaching it is quick and easy. It has the following effects, and its practical value is extremely large.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of the conventional type, Fig. 2 is an explanatory diagram of the present invention, Fig. 3 is an explanatory diagram of the operating principle of the present invention, a is a side view, b is a front view, and Fig. 4 is a hinge type telescopic diagram of the present invention. The installation of the tube is a diagram showing the structure; a is a sectional view taken along line B-B in FIG. 2, and b is a sectional view taken along line A-A in FIG. 4. 1.10...Blowpipe, 2.11...
... Tighten with hardware, 3, 12 ... Tuyere, 4, 13
...Blowpipe spherical surface, 5,14...
Downpipe, 6, 16...Gimbal type telescopic pipe, 7
, 17...Bent pipe, 8°18...Hot air annular pipe, 9...Spherical joint, 15...Hinged expansion pipe.

Claims (1)

[Scope of utility model registration request] A hinge-type telescopic pipe is placed between the blowpipe, which is connected to the tuyere using a spherical joint, and the lower part of the downpipe, and a gimbal-type telescoping pipe is placed between the upper part of the downpipe and the upper bent pipe. A blower branch pipe for a vertical furnace characterized by the following structure.