JPH0233892Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a spray nozzle for spraying powdered refractories, and more specifically, to increase the degree of mixing between liquid and powdered refractories. By this,
This invention relates to a spray nozzle that has been improved to improve the adhesion rate and the uniformity of the sprayed material.

[Prior Art] One method of spraying monolithic refractories is to supply monolithic refractories into a nozzle, add liquid to the slurry in the nozzle, and spray the slurry from the tip of the nozzle. .

FIG. 5 is a sectional view of a conventional spray nozzle used in such a spray method. As shown in FIG. 5, a liquid addition section 14 for injecting liquid into the nozzle body 10 is provided at a required distance rearward from the tip opening 12 of the cylindrical nozzle body 10. The liquid addition section 14 includes a large number of water addition holes 16 penetrating the tube wall surface of the nozzle body 10, a ring-shaped water distribution member 18 that covers the outer periphery of the nozzle at the portion where the water addition holes 16 are drilled, and a water distribution member 18 for water distribution. It is comprised of a liquid intake port 20 opened in the member 18 and a liquid introduction pipe 22 connected to this intake port 20. Also,
A receiving port 24 for receiving powdered refractory raw material is provided on the rear end side of the nozzle body 10.

In such a configuration, the powdered refractory raw material introduced into the nozzle body 10 from the intake port 24 passes through the intake port 20 and the liquid addition hole 14 into the nozzle body 1.
The slurry is mixed with the liquid introduced into the nozzle and is ejected from the tip opening 12 of the nozzle body 10 onto the surface to be sprayed.

[Problems that the invention aims to solve] In recent years, spraying systems have become more sophisticated, and systems have been developed that use not only water but also special liquids to add to powdered refractory raw materials to obtain high-quality construction products. ing. However, this added liquid usually has a much higher viscosity than water;
As a result, it lacks wettability with the powdered refractory and tends to be ejected from the nozzle tip opening without being well mixed with the powdered refractory. If the mixing is insufficient in this way, the adhesion rate of the sprayed material will be low, and so-called layered lamination will occur on the construction body.
This causes a lack of uniformity in physical properties.

[Means for Solving the Problems] In order to solve the above-mentioned problems, the present invention provides an ultrasonic oscillator in a part of the refractory spray nozzle through which liquid passes.

[Function] In the spray nozzle of the present invention, ultrasonic vibrations are applied to the liquid added to the powdered refractory, and the ultrasonic energy can provide a dispersion effect and reduce its viscosity. This significantly increases the degree of mixing between the powdered refractory and the additive liquid.

[Examples] The present invention will be described in more detail below with reference to embodiments shown in the drawings.

FIG. 1 is a longitudinal cross-sectional view showing the structure of a spray nozzle according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along the line - in FIG. 1.

Reference numeral 26 is a tank for storing powdered refractory raw materials, and the powdered refractory raw materials can be supplied to the refractory raw material receiving port 24 of the nozzle via a pipe 27 using compressed air. The code 28 is
This is a liquid tank for storing liquid to be added to powdered refractories, and the liquid can be supplied to the receiving port 20 via a pipe 22 using pressurized air. Therefore, the liquid reservoir 3 in the water distribution member 18
0, the tip 32a of the ultrasonic oscillator is inserted. Reference numeral 34 is an oscillation circuit which supplies a high frequency signal to the oscillator 32 to oscillate an ultrasonic oscillator built in the chip 32a.

In the spray nozzle configured in this way,
Ultrasonic energy is applied to the liquid introduced into the liquid reservoir 30 from the ultrasonic oscillator 32, thereby imparting a dispersion effect and reducing its viscosity. Therefore, the viscosity of the liquid introduced into the nozzle body 10 from the liquid addition hole 16 becomes small, and after the powdered refractory raw material supplied into the nozzle body 10 from the receiving port 24 is sufficiently mixed, the tip opening 1
It will start to be ejected from 2.

FIG. 3 is an axial cross-sectional view of a spray nozzle according to a different embodiment of the present invention, and FIG.
It is a sectional view along a line. In this example,
A small nozzle-shaped water distribution member 36 is used.
This water distribution member 36 includes a cylindrical insertion portion 36a with one end sealed that is inserted into the nozzle body 10, and a liquid reservoir portion 36 formed at the other end of the cylindrical insertion portion 36a.
b, and a liquid receiving port 20 is provided in this liquid reservoir portion 36b. Also, the cylindrical insertion part 3
A liquid spout 36c is provided at the tip of 6a. Therefore, the chip 32a of the oscillator 32 is
It is deeply inserted so as to reach into the cylindrical insertion part 36a from the liquid reservoir part 36b.

In the spray nozzle according to FIG. 3 and FIG.
It is ejected into the nozzle body 10 from 6c. Also,
The powdered refractory material is introduced into the nozzle body 10 from the receiving port 24, mixed with the liquid ejected from the liquid ejection port 36c, and then ejected from the tip opening 12. Also in this embodiment, the liquid to be added is given ultrasonic energy by the ultrasonic oscillator 32 to reduce its viscosity, so that the liquid and the powdered refractory are sufficiently mixed.

In the spray nozzle according to the embodiment shown in FIGS. 3 and 4, the liquid reservoir 36b is made smaller than that according to the embodiment shown in FIGS. 1 and 2, and the entire nozzle area is The configuration is compact.
In addition, since the chips 32a are disposed along the direction in which the liquid passes, the efficiency of transmitting ultrasonic waves to the liquid is high, and the effect of lowering the viscosity of the liquid is strong.

In addition, in the embodiments shown in FIGS. 1 to 4,
The configuration other than the above description is the same as that of the conventional example shown in FIG. 5, and the same parts are given the same reference numerals.

[Effects of the invention] As mentioned above, according to the spray nozzle of the invention,
Since the degree of mixing between the liquid and the powdered refractory increases, the construction body becomes more uniform, there is less peeling on the working surfaces, and the durability can be improved.

The amount of dust generated during spraying work is reduced, improving the working environment.

The adhesion rate can be improved.

Excellent effects such as

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing one embodiment of the present invention;
The figure is a sectional view taken along the - line in Fig. 1, Fig. 3 is a sectional view showing a different embodiment of the present invention, and Fig. 4 is a sectional view taken along the - line in Fig. 1.
FIG. 5 is a cross-sectional view taken along the line - in the figure, and FIG. 5 is a cross-sectional view showing a conventional example. 10...Nozzle body, 14...Liquid addition section, 2
0...Liquid intake port, 24...Powdered refractory raw material intake port, 32...Ultrasonic oscillator.

Claims (1)

[Scope of utility model registration request] A refractory spray nozzle is equipped with an inlet for powdered refractory raw materials and an inlet for liquid raw materials, and mixes the powdered refractory raw materials and liquid internally and sprays the mixture from the tip. A nozzle for spraying refractories characterized by being equipped with a sonic oscillator.