JPS5817639Y2 - Nozzle for spraying powder materials - Google Patents

Description

[Detailed description of the invention] This invention is a device for spraying and adhering refractory powder particles for cold or hot spraying on refractory walls such as industrial furnaces and containers for molten metal. Regarding the improvement of a spray nozzle that injects a mixing liquid into the nozzle pipe to humidify the powder material conveyed by pressurized air, the powder material and the mixing liquid are injected into the nozzle pipe. The purpose of this is to rapidly mix the spray while it flows through the flow, improve spray adhesion to the target object, and prevent flaking.

The above-described spraying of the powder material is performed by pouring an appropriate amount of mixing water from the injection tube 2 into the powder material flowing through the long nozzle tube 1 as shown in FIG. When the mixing occurs rapidly and uniformly within the nozzle pipe, the unhumidified portion of the powder material injected from the nozzle bounces off the object and rises obliquely, resulting in loss of powder material and pressurized air. This has disadvantages such as not only inefficiency in spraying construction but also the generation of dust.

The present invention eliminates such drawbacks.

FIG. 2 shows an embodiment of the present invention, in which a mixing liquid injection tube 2
turbulent flow mixing parts 4 and 5 are provided in two places between the injection pipe 2 and the spout 3 of the nozzle pipe 1 so as to communicate with the inner space. The above is formed intermittently.

In this embodiment, the maximum inner diameter of the turbulent mixing parts 4 and 5 is about 1.5 to 1.8 times the inner diameter of the nozzle pipe 1, and the inner diameter of the nozzle 3 is about 0.9 times the inner diameter of the nozzle pipe 1. did.

Of course, the shape of the turbulent flow mixing section does not necessarily have to be the cross-sectional shape of the embodiment, but may be any shape that can generate turbulent flow or vortex flow by changing the flow velocity.

In the above embodiment, the powder material filled in the pumper is conveyed to the nozzle pipe 1 by pressurized air, and a mixing liquid of approximately 10% weight ratio to the conveyed powder is directly poured from the pouring pipe 2. The mixture is mixed by repeating the action of stirring and mixing the mixed fluid several times in the turbulent flow mixing sections 4 and 5 by turbulence generated from the increase and change in flow velocity, respectively, and then kneading. The ideally humidified powder material is sprayed from the nozzle 3 onto the object 6.

The present invention has the configuration as exemplified above, and mixes the powdered material injected from the nozzle 3 into the nozzle pipe 1 from the injection tube 2, and the inner diameter of the injection tube 2 is sequentially enlarged. , and is repeated intermittently in two or more turbulent flow mixing sections that have returned to the normal pipe diameter after expansion, automatically achieving ideal uniform humidification and cross-conducting without changing the back pressure of the nozzle pipe 2. Because it is sprayed onto the object 6, there is no problem that it adheres in a dense manner due to the pressure of the pressurized air and some of the powder bounces off and goes up the slope, and it has an extremely good hardness. There are excellent benefits that can be produced by sprayed layers.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of a conventional spray nozzle, and FIG. 2 is a cross-sectional view showing an embodiment of the present invention. 1...Nozzle pipe, 2...Pouring tube, 3.
...Nozzle, 4.5...Turbulent mixing section.

Claims (1)

[Scope of utility model registration request] A mixing liquid injection pipe is provided in communication with the inner space of the nozzle pipe,
The mixing liquid from the pouring tube is mixed with the powder material conveyed to the nozzle tube by pressurized air, and the mixed fluid is spouted from the spout. two or more turbulent flow mixing parts that sequentially expand the inner diameter of the injection pipe between the nozzle port and sequentially return the inner diameter of the injection pipe from the enlarged one to the normal pipe inner diameter to change the flow velocity of the mixed fluid and generate turbulent flow; A nozzle for spraying powder material, characterized in that it is provided intermittently.