JPS6236078Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention uses powder refractories (hereinafter simply referred to as refractories), which are used in the construction of various industrial furnaces constructed with refractories or in the repair of damaged parts of the furnace body, to be used as a carrier gas. This invention relates to pipes for spraying refractories that can be sprayed by spraying.

BACKGROUND OF THE INVENTION BACKGROUND ART Spraying methods have traditionally been employed for the construction or repair of various industrial kilns, but these methods are classified into dry spraying methods and wet spraying methods depending on the timing of water addition.

That is, in the dry spraying method, water is added immediately before spraying, and in the wet spraying method, water is added in advance.

Since the present invention belongs to the dry spraying method, we will explain the spray pipe conventionally used for this type of spraying method.As shown in Figure 1, the material hose (not shown) is ) from the connecting pipe 1 to the spray pipe 2.
Water is added to the refractory transported through the watering ring 3 provided in the middle of the spray pipe 2, and the mixed refractory is discharged from the tip nozzle 4 at the tip of the pipe, and is placed in an industrial kiln, such as a tundish 5. It is designed to be sprayed onto the treated surface.

To explain the above configuration in more detail based on FIG. 2, the water ring 3 includes a water retaining member 8 on the outer periphery of a water spouting pipe 7 provided with a large number of pores 6, .
are provided, and the pores 6,
A water retention groove 9 surrounding the outer periphery of the introduction hole 1 is provided.
It communicates with 0. In the water ring 3 configured as described above, the upper and downstream connecting pipes 11, 11 are screwed onto the inner periphery of both sides of the water holding member 8 to fix the water jetting pipe 7, and both the connecting pipes 11, 11 are used to spray water, respectively. It is screwed onto pipe 2.

In the figure, 2' indicates a wear-resistant inner tube, and 4' indicates an inner tube.

Since the pores 6, ... of the conventional watering ring 3 are all perforated towards the center as shown in Fig. 3, the supplied water flows through the pores 6, ... as shown in Fig. 4. It flows along the wall surface in an expanding manner toward the downstream side, creating a wet surface and a non-wet surface on the wall surface. This causes a change in the flow velocity on the wall surface, causing the adhesion of fine particles of the refractory material passing through it. When fine powder partially adheres to the inner surface of the pipe, the flow of powder flowing on the inner surface of the pipe becomes uneven, and a phenomenon occurs in which the refractory and water are discharged from the nozzle tip without being sufficiently mixed. Therefore, in this state, the water-mixed refractory (hereinafter referred to as the construction body) is sprayed onto the work surface.
had the disadvantage that uniform products could not be obtained.

SUMMARY OF THE INVENTION In view of the above-mentioned drawbacks of the conventional pipes, it is an object of the present invention to provide a pipe for spraying refractories that can prevent refractories from adhering to the inside of the pipe.

The structure of the present invention will be explained in detail based on the embodiment shown in FIG. ,... are drilled in the tangential direction of the pipe.

The rest is the same as the conventional one, so illustration and explanation will be omitted.

In this embodiment, as shown in FIG. 5, the pores 6,...,
If the carrier gas is ejected from 6',..., the inside of the pipe can be covered with a complete film, and if the carrier gas is flowed from upstream to downstream as shown in Figure 6, the water will flow along the same circumference on the inner wall of the pipe. , it will flow downstream in a uniform state.

Therefore, when the refractory is carried into the pipe, it is possible to smoothly mix the refractory inside the pipe and at the same time prevent the occurrence of adhesion.

In the above embodiment, some of the pores were described as being provided in the tangential direction, but all of the pores may be provided in the tangential direction.In short, at least some of the pores may be provided in the tangential direction.

By providing all of the pores in the tangential direction and further installing the pores near the tip nozzle, it is also possible to prevent dust generation during spraying construction.

Since the present invention has the above-mentioned structure and function, the adhesion of refractory to the inner surface of the pipe is reduced, the refractory and water are mixed well, and the refractory adhering to the construction surface forms a uniform construction body. can do.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of a tundish being repaired using a conventional spray pipe, Figure 2 is an enlarged cross-sectional view of the main part, Figure 3 is a vertical front view of the water jet pipe, Figure 4 is a vertical side view, and Figure 5 is a longitudinal sectional front view of the main part showing one embodiment of the refractory spray construction pipe according to the present invention;
The figures each show a longitudinal side view. In the figure, 2 is a blowing pipe, 3 is a watering ring, and 6 and 6' are pores.

Claims (1)

[Scope of utility model registration request] A fire-resistant spray pipe 2 having a watering ring 3 having a large number of water spouting pores perforated in its inner circumferential surface, wherein at least some of the pores are perforated in the tangential direction of the inner circumferential surface. Pipe for spraying construction.