JPH0315493B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a spray nozzle, and more particularly to a spray nozzle that performs full cone spray or elliptical spray using a gas-liquid mixing method and is used to cool high-temperature objects such as iron. It is.

With the development of continuous casting methods, cooling during the iron manufacturing process has recently changed from the conventional method to prevent surface cracking, prevent clogging, and speed up continuous casting.
Fluid nozzles are being replaced by two-phase fluid nozzles. However, until now, fan-shaped sprays were mainly used at the center of the slab, but in order to widen the roll spacing for blooms, billets, etc., it has become necessary to use nozzles with a wide full conical or elliptical spray pattern. ing.

BACKGROUND ART Conventionally, as shown in Fig. 11, in a general two-phase fluid nozzle, a narrow angle (θ=30°) as shown in () is used.
Only a full cone spray or a fan-shaped spray can be obtained.
It was difficult to obtain a full conical spray as shown in (), which is seen in a one-fluid nozzle. This is because it is not easy to widen the spray angle by swirling a liquid like a single fluid in the case of a gas.For example, if the spray angle of the nozzle is widened to 90 degrees as shown in () Also, only an empty conical spray shape as shown in () could be obtained, and a full conical spray as shown in () obtained with a one-fluid nozzle could not be obtained.

Purpose of the Invention The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a spray nozzle that can generate a wide full conical spray or an elliptical spray using a two-phase gas-liquid fluid. It is something.

Structure of the Invention The present invention involves mixing a gas and a liquid, and then flowing into a stirring chamber provided near the nozzle through two opposing inlet holes provided perpendicular to the injection direction, causing the gas and liquid to collide. To provide a spray nozzle characterized in that the spray nozzle spreads the mist in the same direction as the bottom of the stirring chamber opposite to the injection direction, and generates a full cone spray by reflecting the mist from the bottom. It is. Specifically, gas and liquid are mixed in the center of a flow path provided along the axis of the adapter body, a nozzle tip is attached to the tip of the flow path, and a stirring chamber and a spout soirée part are attached to the nozzle tip. At the same time, an inflow hole is formed through which the fluid flows into the stirring chamber from the flow path, and the fluid collides in the stirring chamber and is sprayed along the nozzle soirée part, and is reflected again at the bottom of the stirring chamber. and then spray
A spray nozzle characterized in that it is configured to generate a spray pattern of a full cone, and a spray nozzle characterized in that the axes of the opposing inflow holes are aligned with the boundary between the stirring chamber and the spout soirée part, and , the above-mentioned stirring chamber is connected to the inner small-diameter first
The present invention provides a spray nozzle characterized in that the spray nozzle has a stirring chamber and a second stirring chamber with a large diameter on the outside, and the axis of the inflow hole is aligned with the boundary between the first stirring chamber and the second stirring chamber. .

Embodiments Hereinafter, the present invention will be explained in detail with reference to embodiments shown in the drawings.

In Figure 1, 1 is a nozzle tip, 2 is a cap nut,
3 is the adapter body, and 4 is a liquid socket.

As shown in the figure, the adapter body 3 is provided with a flow path 3a along the axis, and the flow path 4a of the liquid socket 4 attached to the center of the X side is communicated with the flow path 3a. Gas (air) supplied from the proximal end side, liquid (water) supplied from the channel 4a, and channel 3
The mixture is mixed in the center of a. The inner small diameter portion 1a of the nozzle tip 1 is fitted into the tip side of the adapter body 3 with a gap between the inner wall and the flow path 3a, and the outer large diameter portion 1b of the nozzle tip 1 is brought into contact with the tip of the adapter body 3 to control the flow. Along with closing Road 3a,
The nozzle tip 1 is attached to the adapter body 3 by externally screwing the cap nut 2 fitted into the large diameter portion 1b onto the adapter body 3.

The nozzle tip 1 has a structure shown in FIG. 2, and has a stirring chamber 5 with a circular cross section in the small diameter part 1a, and a front end in the large diameter part 1b that is continuous with the front opening 5a of the stirring chamber 5. A nozzle soirée portion 6 is provided which is inclined and enlarged toward the side. The side wall 5b of the stirring chamber 5 is provided with two opposing inlet holes 7, 7. These inflow holes 7, 7 are
For reasons described later, the straight line S connecting these axes is set to coincide with the boundary between the stirring chamber 5 and the nozzle soirée part 6, and the inflow hole direction and the spray direction are set to be perpendicular to each other. ing. The mixed two-phase fluid is caused to flow in from the flow path 8 formed in the gap between the side wall 5b of the nozzle tip 1 and the inner wall of the adapter body 3 through the inlet holes 7, perpendicular to the spraying direction.
Collision occurs within the stirring chamber 5 and the nozzle soirée portion 6 to generate spray.

Assuming that the inflow direction of the spray is the X-axis, the direction perpendicular thereto is the Y-axis, and the spray direction is the Z-axis, after the two-phase fluids that have flowed in from the opposing inflow holes 7, 7 collide, some of them Spray along the nozzle soirée part 6,
In addition, some of it collides and is sprayed while spreading in the Y direction, and furthermore, some of it spreads in the opposite direction to the nozzle soirée part 6 and collides with the bottom surface 5c of the stirring chamber again, and then the nozzle soirée part 6
It will be sprayed afterwards. The overlapping of these three sprays forms the basic principle of forming a full cone spray pattern.

In order to generate a desirable full cone spray shape, the shape of the stirring chamber 5, that is, the diameter (φds), depth (ls), and relative positional relationship between the inflow holes 7, 7 and the stirring chamber 5 must be adjusted appropriately. It is necessary to decide on the dimensions. Third
As shown in the figure and Fig. 4, the spray angle in the X direction is θx, the spray angle in the Y direction is θy, and the flow rate directly below the nozzle at a certain spray height (H) is 50
% is effective for cooling, etc., and the effective spray angle is expressed as θx50 and θy50, θx50
It is desirable for the ratio of θy50 and θy50 to be approximately 1 for a full conical spray shape. Based on this basic principle, the diameter, depth, etc. of the stirring chamber 5 are set so that θx50/θy50≈1.

As an example of the above, FIG. 6 shows the relative position (x) between the stirring chamber 5 and the inflow hole 7, θx50, θy50,
Indicates the ratio of ÷50/θy50. The spraying conditions were air pressure (Pa) of 3 kg/cm ² , hydraulic pressure (Pw) of 2 kg/cm ² , and spray height (H) of 75 mm. As a result, the center (axis S) of the inlet holes 7, 7 shown in FIG.
The spray angles θx50 and θy50 both reached their maximum at the point of intersection (boundary) with the nozzle soirée portion 6, and θx50/θy50=1.125, resulting in an almost perfect full conical spray shape. Therefore, as shown in the embodiment shown in FIG. 2, it is most preferable to set the centers of the inflow holes 7, 7 at the boundary between the stirring chamber 5 and the nozzle soirée section 6.

In this way, when the spray nozzle having the structure shown in FIG. collide in the stirring chamber 5,
Spreading in the Y-axis direction and Z-axis direction, the spray width increases along the nozzle soirée portion 6, and the spray that collides with the bottom surface of the stirring chamber 5 and is re-reflected is later injected, resulting in a full cone spray.

As shown in FIG. 7, when the inflow holes 7, 7 are arranged at the upper end of the nozzle soirée part 6, the spray angle in the X-axis direction is θx = 78°, and the spray angle in the Y-axis direction is θy = 52°. Generates spray.

FIG. 8 shows another embodiment of the present invention, in which the shape of the nozzle tip 1' is changed to inlet holes 7', 7' as shown in the figure.
A stirring chamber is also provided in a portion where the spout is connected to the nozzle stirring portion 6', and is formed as a second stirring chamber 11 having a larger diameter than the first stirring chamber 10 on the inner side, so that the stirring chamber has a two-stage shape. In this case, the center S of the inflow holes 7', 7' is arranged at the intersection (boundary) of the first stirring chamber 10 and the second stirring chamber 11. Since the other structures are the same as those of the previous embodiment, their explanation will be omitted.

According to the embodiment described above, it is possible to prevent the generation of coarse particles that are partially scattered along the nozzle opening portion 6'. When the nozzle tip 1' was used, the flow rate distribution of the gas-mixed two-phase fluid in the X-axis direction and the Y-axis direction was as shown in FIG. 9, and a full conical spray with θ=87° was generated. When only water was sprayed using the nozzle tip 1', a full conical spray pattern with θ=92° was generated.

In addition, in the spray nozzle using the above nozzle tip 1', the spray flow rate is 1.5 to 5/min.
When the spray angle was varied within the above range, the spray angle remained almost constant as shown in FIG. In addition, the droplet diameter in this flow rate range is the Sauter mean diameter ( ₃₂ ).
The particle size was 150 to 250 microns, which was about half the size of the 350 to 450 microns in the case of a typical single-fluid nozzle, and was considerably finer, making it a so-called mist.

Effects of the Invention As is clear from the above explanation, according to the spray nozzle according to the present invention, after mixing gas and liquid,
The gas-liquid mixed two-phase fluid flows oppositely into a stirring chamber provided near the nozzle, collides within the stirring chamber in a direction perpendicular to the injection direction, and is re-reflected at the bottom of the stirring chamber to generate a post-spray. A full cone spray can be obtained. Furthermore, compared to conventional single-fluid nozzles, the droplets are much finer, and the spraying angle can be kept constant while the flow rate can be greatly varied, among other effects.

[Brief explanation of the drawing]

Fig. 1 shows one embodiment of the spray nozzle of the present invention, Fig. 2 is a sectional view, Fig. 2 is a bottom view, Fig. 2 is a nozzle tip of Fig. 1, Fig. 3 is a sectional view, Fig. 3 is a bottom view, and Fig. 3 is a spray nozzle. FIG. 4 is a flow rate distribution diagram according to the spray angle in FIG. 3, FIG. 5 is a cross-sectional view showing the dimensional relationship of the nozzle tip, and FIG. 6 is a diagram showing the relationship between the position of the inlet hole and the effective spray angle. diagram showing,
Figure 7 shows a modification in which the position of the inflow hole is changed,
8 is a sectional view showing another embodiment of the nozzle chip, FIG. 9 is a flow rate distribution diagram when the nozzle chip of FIG. 8 is used, and FIG. 10 is a sectional view of the nozzle chip. 11 is a diagram showing the relationship between the spray flow rate and the spray angle, and FIG. 11 is a drawing showing a conventional example. 1... Nozzle tip, 2... Bag nut, 3...
Adapter body, 4...liquid socket, 5...stirring chamber, 6...spout soirée section, 10...first stirring chamber, 11...second stirring chamber.

Claims (1)

[Claims] 1. Gas and liquid are mixed in the center of a channel provided along the axis of the adapter body, and a nozzle tip is attached to the tip of the channel, and a stirring chamber and a stirring chamber are attached to the nozzle tip. The nozzle soirée part is formed continuously, and an inflow hole is formed through which fluid flows into the stirring chamber from the flow path, so that the fluid collides in the stirring chamber and is sprayed along the nozzle soirée part, and the agitation chamber A spray nozzle characterized in that it is configured to generate a full cone spray pattern by re-reflecting at the bottom and performing post-spraying. 2. The spray nozzle according to claim 1, wherein the axes of the opposing inflow holes are aligned with the boundary between the stirring chamber and the nozzle soirée section. 3. In the spray nozzle according to claim 1, the stirring chamber has a first stirring chamber with a small diameter on the inside side and a second stirring chamber with a large diameter on the outside side, and the axis of the inflow hole is aligned with the first stirring chamber and the second stirring chamber with a large diameter on the outside side. A spray nozzle characterized in that the spray nozzle is aligned with the boundary between two stirring chambers.