JPS5820587Y2 - Powder equalizer - Google Patents

Description

[Detailed description of the invention] When powder is transported by air, the present invention is designed to distribute and supply the powder equally to multiple locations through distribution pipes branched from the main powder pipe.
(transportation)).

For example, when melting and injecting refractory powder to repair damaged parts of a furnace lining, it is necessary to distribute and feed the powder to a plurality of burners in order to spray a large amount of refractory material in a short period of time.

In this case, if there are variations in the amount of powder supplied to the burner, the melted state of the powder during melt injection will become non-uniform, making it impossible to obtain a reliable sprayed layer.

On the other hand, when supplying refractory material powder to the burner, transporting the powder at low density and high speed from the powder feeder into a relatively long piping at burner L results in low transportation efficiency and increased power requirements. A problem arises in that the piping becomes noticeably worn.

The present invention attempts to solve all of the above problems by using an ejector type accelerator placed near the burner.

The present invention will be explained based on the drawings.

In FIG. 1, 1 is a powder supply main pipe connected to the discharge port of a powder feeder (not shown), and its tip is connected to the center of the inlet side end wall 3 of the powder distributor body 20 to the main body. It is inserted concentrically into 2.

An air slide device is suitable as a powder feeder.
Of the piping connecting this powder feeder and the burner described later,
The main pipe 1 for locating the illustrated distributor body 2 close to the burner is relatively long.

A nozzle 6 at the tip of a header pipe 5 is attached to the end wall 3 through an annular slit 4 that surrounds the main pipe 1 in the part that penetrates the end wall 3, and the header pipe 5 is continuous with the nozzle 6.
An auxiliary air pipe 7 is opened in the side wall of the main body.

The auxiliary air pipe 7 is connected to the pressure storage tank via a pulp, pressure regulating valve, etc. (not shown).

Reference numeral 8 denotes a powder diffuser provided inside the main body 2, and its shape coincides with the axis of the main body 2, for example, and becomes narrower toward the tip of the main pipe 1 (towards the left in the figure).

This diffuser 8 is integrally provided at the center of a disc 9 whose outer diameter is the inner diameter of the main body 2.The outer periphery of the date plate 9 is fixed to the inner surface of the main body 2, and there are a number of diffusers along the outer periphery. (Fig. 2).

Adjacent holes io, io are separated by elongated stays 11 extending in the radial direction, and these stays 11 connect to the diffuser 8.
is held in the center of the main body 2.

The shape of the diffuser 8 is determined by taking into consideration the properties of the powder, its fineness, hardness, and the relationship with the auxiliary air, and in addition to the shape described above, the shape shown in Figure 3 a'
-c is selected as appropriate.

Reference numeral 12 denotes a plurality of distribution pipes, which are not located coaxially with the main supply pipe 1, but are provided at equal intervals on the same circumference centered on the axis position as shown in Fig. 4, and are parallel to the main supply pipe 1. Directly facing each other and connecting them to independent burners located close to each other.

In a part of the burner, for example, as shown in FIG. 5, if the tips of the four distribution pipes are each made into an annular tube with a large number of powder injection holes 13, and the periphery thereof is formed so as to be surrounded by a large number of four powder injection holes 14,
A wide area can be repaired by thermal spraying uniformly and in a short time.

With the above configuration, powder with a fineness of about 0.2 degrees or less is passed through the main pipe 1 at high density and low velocity (0.5 to 1-5rn//Be
c) and flows into the first chamber 15 of the main body 2.

At the same time, the auxiliary air supplied from the auxiliary air pipe 7 into the header pipe 5 increases its pressure energy once in the header pipe 5 and continues to accumulate pressure (2 to 5 Kti/crti) to the main pipe 1 and the nozzle 60. Annular slit between 4
The liquid is ejected into the main body 2.

Inside the main body 2, high-density, low-velocity powder is sucked out from the main pipe 1 by high-speed auxiliary air ejected from the slit 4, and at the same time, the mixture is rapidly mixed and collides with the diffuser 8, dispersing it in all directions. It enters the second chamber 16 through a large number of holes 10, flows into each distribution pipe 12 in a sufficiently stirred state, and from there flows into the corresponding burner with low density and high speed (15 to 25 m
sec).

In this way, according to the present invention, an ejector-type accelerator is placed in the front half of the distributor, so when the powder is mixed with auxiliary air and accelerated, it is vigorously agitated, and even if there are variations in powder composition or particle size. Even if the mixture is homogeneous, it collides with the powder diffuser 8 concentric with the main pipe 1 and is evenly dispersed in all directions.

Therefore, the powder can be evenly distributed to each distribution pipe 12 no matter what direction the distributor faces.

In the past, since the powder was transported from the powder feeder to the distributor 1 at high density and at low speed, the main pipe for powder supply did not wear out, and various effects such as reducing power costs and reducing the diameter of the main pipe were achieved. be.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention, FIG. 2 is a perspective view of a diffuser, FIGS. 3 a-c are longitudinal sectional views showing other examples of diffuser shapes, and FIG. FIG. 5 is a front end view showing an example of application to a refractory thermal spray burner. 1...Main piping for powder supply, 2...Distributor main body, 3...Inlet side end wall, 4...Slit, 5... ... Header pipe, 6 ... Nozzle, 7 ... Auxiliary air piping, 8 ... Diffuser, 9 ... Disk, 10 ... ...hole, 11
...Stay 12...Distribution pipe, 13.
...Powder injection hole, 14...Fuel injection hole.

Claims (1)

[Scope of utility model registration request] On one end wall of the cylindrical body, a main pipe for powder supply and a nozzle of a header pipe separated from the annular slit surrounding the main pipe are provided concentrically with the main body, and an auxiliary air pipe is connected to the header pipe. A diffuser with a conical center and many holes on the outer periphery is installed concentrically in the main body facing the tip of the pipe.
An even powder distributor characterized in that a plurality of distribution pipes are provided on the other end wall of the main body at equal intervals on the same circumference and concentric with the main pipe.