JPS594759Y2 - Powder spray nozzle equipment - Google Patents

Description

[Detailed description of the invention] This invention relates to a powder spray nozzle device for lining the surface of an object by flame spraying, and particularly to a powder spray nozzle device for spray coating, repairing, or other thermal spray lining of refractories such as furnace linings. .

Thermal spray nozzles have complex functions such as spraying powder materials, generating flames, melting and spraying powder materials.

Thermal spray nozzles that have been commonly used in the past to have such complex functions include, for example, a structure in which a powder injection hole 1 is provided in the center and flame holes 2 are arranged around it, as shown in Fig. 1. are known.

In order to increase the thermal spraying ability of a thermal spray nozzle with such a structure, it is necessary to increase the number of flame holes 2 and at the same time, increase the diameter of the powder jet hole or increase the powder jet concentration. Measures are being taken.

If the latter enlarges the diameter of the ejection hole or increases the concentration of powder ejected, the heat efficiency from the flame to the powder deteriorates, making it impossible to obtain a dense and high-strength thermal sprayed body.

In addition, with conventional thermal spray nozzles, the mixing state of the powder injected from the thermal spray nozzle and the flame, that is, the dispersion of the powder in the flame, is not uniform, and therefore it is difficult to achieve a uniform thermal spray coating.

Moreover, it is extremely difficult to cover a large area densely and uniformly using these known thermal spray nozzles.

However, as a means of uniformly coating a large area with metal spraying, arranging a large number of known thermal spray nozzles at predetermined intervals has been disclosed, for example, in Japanese Patent Laid-Open No. 74637/1983.

However, even if the known thermal spray nozzles are arranged at a simple specific interval in this way, even if the uniformity of the coating is improved, it cannot be said that the denseness and strength of the coating are sufficient.

The purpose of the present invention is to provide a powder spray nozzle device that can form a thermal spray coating that has sufficient uniformity and density and has satisfactory strength even when spraying a large area. The present invention will be described in detail below with reference to the drawings.

FIG. 2 is a front view showing an example of the powder spray nozzle device of the present invention, in which reference numeral 3 denotes a convergence frame, on which an arbitrary number of thermal spray nozzles 4 are attached so that their axes intersect at the same point.

The powder injection nozzles of the individual thermal spray nozzles convergently installed in the convergence frame 3 are arranged, for example, through powder injection holes 1. as shown in FIGS. 3-1 to 3-5. A structure with two flame holes is used, but in particular a spray nozzle having a plurality of powder ejection holes in one thermal spray nozzle unit as shown in Figures 3-3 to 3-5 is suitable for dispersing the powder material into the flame. It is preferable for obtaining a uniform coating with good properties.

The arrangement of the thermal spray nozzle units in the convergence frame 3 is not particularly limited, but the thermal spray nozzle units are converged at a slight inclination so that the extension lines of the axes of the respective thermal spray nozzle units, that is, the thermal spray direction axes intersect at the same point. Should.

The intersection point of the thermal spray direction axes of each thermal spray nozzle does not necessarily have to coincide with the arrival point of the thermal spray material, and may be arbitrarily selected depending on the required coating properties. It can also be attached to the focusing frame 3 so that the inclination of each thermal spray nozzle can be adjusted.

Since the thermal spray nozzle device of the present invention is intercepted as described above, it is possible to obtain an extremely uniform and dense coating even when spraying a large area.

That is, FIG. 4 shows the porosity (dense porosity) of the thermal spray coating that was thermally sprayed using the thermal spray nozzle device of the present invention and the known thermal spraying device using a powder material whose particle size was adjusted to 120395% A as the thermal spraying material and propane-oxygen as the fuel. The results show that when using the device of the present invention, the porosity is extremely low and the compressive strength is extremely high.The powder spray nozzle device according to the present invention is significantly superior. A thermal spray coating can be formed.

[Brief explanation of drawings]

Fig. 1 is a front view of a known thermal spray nozzle, Fig. 2 is a front view of a thermal spray nozzle device of the present invention, Fig. 3 is a front view of an example of a thermal spray nozzle unit used in the device of the present invention, and Fig. 4 is a front view of the present invention. FIG. 3 is a diagram showing the properties of a sprayed coating obtained with the invented device. 1...Powder spout hole, 2...Flame hole, 3
...Convergence frame, 4...Thermal spray nozzle.

Claims (1)

[Scope of utility model registration request] A powder spray nozzle device in which a plurality of single spray nozzles each consisting of a powder spray material injection hole and a flame hole are convergently arranged so that the axes of the respective spray nozzles intersect at the same point on the extended line in the spray direction.