JPH025897Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial field of application: This invention allows for efficient spraying work in a sufficiently mixed state when mixing monolithic refractories with water and spraying them at required locations. This relates to a spray nozzle that can be used.

Conventional technology: For hot repair of refractories installed in molten metal containers, a method of spraying monolithic refractories onto the required areas is commonly used.
The wet method involves pumping a slurry made by pre-mixing monolithic refractories, water, binder, etc. into the pipe using air pressure and injecting it from a nozzle at the end. It is well known that a dry method is used in which water is added and mixed and jetted out at the same time. For both of these, it is easier to ensure an appropriate amount of mixed water to obtain a good refractory structure, compared to the wet method, where the ratio of added water to the monolithic refractory (hereinafter referred to as spray material) tends to be large. The dry method is widely used.

In this dry method, the spraying material is generally fed from a spraying material hopper (not shown) provided in a spraying device to a nozzle via a pressure feed pipe using compressed air. On the other hand, a water equalizer ring is attached to the outer periphery of the nozzle, and a water supply pipe is connected to the nozzle, and water or water containing a binder as necessary is injected into the nozzle from a spout hole drilled in the nozzle body at the water equalizer ring part. The spray material is mixed with the spray material that has been pumped through the nozzle, and then sprayed from the tip of the nozzle to the desired location, such as the area to be repaired.

However, in many of these conventional nozzles, the water addition means only jets out from the outer periphery of the nozzle in the axial direction, making it difficult to evenly mix the spray material, which comes in the form of powder, with water. As a result, the refractory material is sprayed in an insufficiently mixed state, resulting in partial condensation after spraying the refractory material, "sag" falling from the nozzle tip, or non-uniform structure of the refractory obtained, resulting in its physical properties and characteristics not being as expected. Therefore, the quality of the refractories inevitably deteriorated.

Purpose of the invention: In view of the current situation, the present invention proposes a spray nozzle that can efficiently mix powdered spray material with water and spray high-quality refractories. This is a device that applies a torsional driving force due to swirling airflow to the mixed spray material mixed with water jetted from the outer periphery toward the center of the nozzle body, and also provides a flexible core member installed in the length direction of the nozzle body. The purpose of the present invention is to provide a spray nozzle that provides sufficient agitation in conjunction with vibration and enables spraying work in a uniformly mixed state.

Structure/Example of the invention: Hereinafter, one embodiment of the invention will be described based on the drawings. As shown in FIG. 1 or 2, a water equalizer ring 5 to which a water supply pipe 6 is connected is attached to the outer periphery of the nozzle body 1 which communicates with the material pressure feeding pipe 4 via a cross coupling 3. An appropriate number of water injection holes 5' are bored in the nozzle body in the area surrounded by 5. A swirling airflow blowing section 9 is provided between the water equalizer ring 5 and the tip nozzle 2. As shown in FIG. 3 or 4, the swirling air flow blowing section 9 creates a gas inflow space 10 by a housing 9' to which the air pipe 8 is connected.
A helical core 11 with a turning groove 11 carved on the outer periphery,
The helical outer periphery is in close contact with the inner circumferential surface of the housing 9', and the inner circumferential surface of the helical core 11 is the nozzle body 1.
A swirling airflow blowing slit 13 is provided in the nozzle body 1 on the tip nozzle 2 side of the helical core 11 in the housing 9'.

Furthermore, a cylindrical flexible core member 7 made of rubber, synthetic resin, a braided body, or the like is provided in the direction of the center line of the nozzle body 1. This flexible core member 7 has its proximal end joined to the cross coupling ring 3, reaches the tip nozzle 2, its free end faces the opening, and the distance from the vicinity of the swirling airflow blowing part 9 to the free end is long. An appropriate number of cuts or slits 7' along the width direction,
7' are carved, and the space between each of these cuts or slits forms a strip shape, making it possible to swing. In addition to the circular cross-sectional shape shown in FIG. 4, the flexible core member 7 may have a cylindrical shape with a rectangular, elliptical, or polygonal outer periphery, and its length can be adjusted to the nozzle body. It only needs to be approximately equal to , and whether it protrudes from or enters the opening of the tip nozzle 2 can be arbitrarily selected.

Effects and Effects of the Invention: The spray nozzle of the present invention having the above-mentioned structure can perform efficient and stable blowing work on areas to be sprayed, such as areas to be repaired, by the cooperation of the swirling airflow blowing part and the flexible core member. can be done. In this case, the swirling groove 1 in the helical core 11 of the swirling airflow blowing part 9
The twist pitch angle θ of 2 is 10 to 30 in the range of 8 to 45 degrees.
degree is preferred. If this angle is less than 8 degrees, the swirling component of the airflow will be too large and the component force in the spray direction will decrease, making it impossible to obtain stable dispersion.On the other hand, if it exceeds 45 degrees, the force will only be added in the spray direction. Diffusivity decreases. Also,
The ratio of the outer circumferential cross section of the flexible core member 7 to the cross section of the nozzle body 1 is 10 to 60%, preferably 30 to 50%. If this cross-sectional ratio is less than 10%, uniform adhesion cannot be improved during spraying, and if it exceeds 60%, the effective cross-sectional area for pumping the refractory material decreases and the spraying efficiency decreases.

When the spray nozzle of the present invention is actually used, compressed air is used to feed the monolithic refractory material to the nozzle body 1 through the material pressure feeding pipe 4, and water is fed from the water injection hole 5' through the water supply pipe 6 and the water equalizer ring 5. After the mixture of spraying material and water is made, compressed air is sent from the air pipe 8 to the swirling airflow blowing section 9, and a complete swirling airflow is created by the helical core 11 in the housing 9', and the air is mixed into the swirling groove 12. The mixed water is blown into the sprayed material through the communicating annular swirling airflow slit 13 to give it a swirling motion. Due to this rotational movement, the flexible core member 7 is subjected to a resonance effect and pulsates, and furthermore, the flexible core member 7 has a self-stirring function due to the twisting due to the rotational movement of the water-mixed spray material and its reversal after reaching its limit, and the strip portion on the free end side. Violent rocking thoroughly loosens the water mixed refractory material and equalizes each part, allowing it to be ejected uniformly from the pointed nozzle 2 without being biased.

As a result of this spraying condition, the spraying surface is sprayed flatly, resulting in a smooth finished surface even when spraying is performed by mechanical operation, and the phenomenon of parting or "sagging" is completely prevented. is possible,
This naturally prevents loss of the matrix forming portion, and the quality of the refractory obtained is stabilized and improved. Further, the local structures such as the swirling airflow blowing part and the cross coupling are not limited to the above embodiments, and the industrial applicability of the present invention is significant.

[Brief explanation of the drawing]

Fig. 1 is a front view showing one embodiment of the present invention, Fig. 2 is an explanatory cross-sectional view thereof, Fig. 3 is an explanatory view of the main part of the swirling airflow blowing part, and Fig. 4 is a - perspective view of Fig. 3. It is. 1... Nozzle body, 2... Tip nozzle, 3...
Cross coupling ring, 4... Material pressure feeding pipe, 5...
Water equalizer ring, 5'...water injection hole, 6...water supply pipe,
7... Flexible core member, 7'... Notch or slit,
8...Air supply pipe, 9...Swirling airflow blowing section, 9'...
Housing, 10... Gas inflow space, 11... Spiral core, 12... Swirling groove, 13... Swirling air flow blowing slit.

Claims (1)

[Scope of utility model registration request] In a spray nozzle that injects additive water from the outer periphery of the nozzle into the powdered monolithic refractory material being pumped, and sprays the mixed state at the desired location, the water is added between the water equalizer ring for water addition provided on the nozzle body and the pointed nozzle. A housing connected to the air pipe is provided around the part, a helical core with a swirl groove carved therein is tightly fitted, and a swirling airflow blowing slit leading into the nozzle body is provided in front of the helical core to form a swirling airflow blowing section. The nozzle body has a structure in which a flexible member is provided along the axis, the base end of which is joined to the cross coupling ring, and the free end of which is the tip end of the nozzle. A swirling airflow is blown into the mixed water refractory material to impart swirling motion, and this swirling motion is further resonated to cause pulsation in the flexible core member, and these work together to spray the water in a uniformly mixed state. A spray nozzle for a monolithic refractory material, characterized by having a configuration that enables construction.