JPS6295160A - Spray nozzle - Google Patents

Abstract

PURPOSE:To cause conical spray by mixing gas with liquid and thereafter flowing the mixture oppositely into a stirring chamber near to an injection port and therein allowing it to collide in the direction rectangular to the injection direction and spraying it after re-reflecting it in an underside. CONSTITUTION:In relation to a spray nozzle of a gas-liquid mixing system for cooling a high-temp. material such as iron, gas is mixed with liquid in a central part of a flow path 3a provided along a shaft core of a adapter main body 3 and together a nozzle tip 1 is fitted to the tip of the flow path 3a. A stirring chamber 5 and a leading part 6 of an injection port are successively formed. The inflow holes 7 are formed oppositely to the stirring chamber 5 and fluid flowed through the flow path 3a is allowed to collide in the inside of the stirring chamber 5 and flowed along the leading part 6 of the injection port and together re-reflected in the underside of the stirring chamber 5 and thereafter sprayed. In such a way, conical spray is obtained also the liquid droplets are made fine and the flow rate can remarkably be changed while keeping a spraying angle in a constant value.

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, cooling during the iron manufacturing process
Recently, conventional one-fluid nozzles have been replaced by two-phase fluid nozzles in order to prevent surface cracking, prevent clogging, and speed up continuous casting. However, until now, the main type of spray was fan-shaped spray centered on the slab, but bloom,
In order to widen the roll spacing for billets, etc., a nozzle with a full conical or elliptical spray pattern with a wide spray width is required.

BACKGROUND ART Conventionally, as shown in FIG. 11, with a general two-phase fluid nozzle, only a full conical spray with an included angle (θ=30°) or a fan-shaped spray as shown in (II) can be obtained. It was difficult to obtain a full cone spray as shown in (III) seen in fluid nozzles. This is because it is not easy to widen the spray angle by swirling a liquid like a single fluid in the case of gas.For example, the spray angle of the nozzle can be widened to 90° as shown in (IV). However, only an empty conical spray shape as shown in (V) could be obtained, and a full conical spray as shown in (Vl) 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 cone spray or an elliptical spray using a two-phase gas-liquid fluid. It is something.

Structure of the Invention The present invention involves mixing gas and liquid, and then flowing into a stirring chamber provided near the nozzle through two opposing inflow holes provided perpendicular to the injection direction, causing the gas and liquid to collide at right angles to the collision direction. To provide a spray nozzle characterized in that the spray nozzle spreads the mist in the direction opposite to the injection direction and also spreads the mist to 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, and a nozzle tip is attached to the tip of the flow path, and a stirring chamber and a spout soirée 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 section, and at the bottom of the stirring chamber. A spray nozzle is characterized in that it is configured to re-reflect and post-spray to generate a full cone spray pattern, and the axes of the opposing inflow holes are aligned with the boundary between the stirring chamber and the nozzle soirée section. The spray nozzle is further characterized in that the stirring chamber is 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 set such that the axis of the inflow hole is different from the first stirring chamber and the second stirring chamber.
The present invention provides a spray nozzle characterized in that the spray nozzle coincides with the boundary with the stirring chamber.

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

@1 In the figure, 1 is the nozzle tip, 2 is the cap nut, 3 is the adapter body, and 4 is the 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. The gas (air) supplied from the base end is mixed with the liquid (water) supplied from the channel 4a at the center of the channel 3a. 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 it and the inner wall in 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 close the flow path 3a and close the large diameter portion 1b.
The cap nut 2 fitted into the adapter body 3 is externally screwed onto the adapter body 3, and the 7-zuru chimp 1 is attached to the swallowtail 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 opening 5a in the large diameter part lb, which is continuous with the front opening 5a of the stirring chamber 5. Spout soise part 6 that slopes and expands toward the tip side
has been established. The side wall 5b of the stirring chamber 5 is provided with two opposing inlet holes 7.7. These inflow holes7.
7 is set so that the straight line S connecting their axes coincides with the boundary between the stirring chamber 5 and the nozzle soirée part 6, and the direction of the inflow hole and the spray direction are perpendicular to each other, for reasons described later. It is set to . From the flow path 8 formed in the gap between the side wall 5b of the nozzle chip 1 and the inner wall of the adapter body 3, the mixed two-phase fluid is allowed to flow through the inflow hole 7.7 at right angles to the spraying direction, and the mixing chamber 5. and collide within the nozzle soirée section 6 to generate spray.

The inflow direction of the spray is the Z axis, the direction perpendicular to it is the Y axis,
If the spray direction is the Z-axis, after the two-phase fluids flowing in from the opposing inflow holes 7.7 collide, some of them are sprayed along the nozzle soirée part 6, and some of them are sprayed after the collision. It sprays while spreading in the Y direction, and some of it is sprayed at the nozzle souse section 6.
After spreading in the opposite direction and colliding again with the bottom surface 5C of the stirring chamber, the spray is sprayed into the nozzle soirée section 6. The overlapping of these three sprays forms the basic principle of forming a full cone spray pattern.

In order to generate a desirable full conical spray shape, the shape of the stirring chamber 5, that is, the diameter (φds), depth b), and the relative positional relationship between the inflow hole 7.7 and the stirring chamber 5, must be adjusted to appropriate dimensions. It is necessary to decide. As shown in Figures 3 and 4,
The spray angle in the X direction is θx, the spray angle in the Y direction is θy, and a range having a flow rate ratio of up to 50% of the flow rate directly below the nozzle at a certain spray height H) is effective for cooling, etc. When the effective spray angle is expressed as θ×50, θy50,
It is desirable that the ratio of θ×50 to θy50 be approximately 1 as a full conical spray shape. Based on this basic principle, the diameter, fA, etc. of the stirring chamber 5 are set so that θ×50/θ1150'F1.

As an example of the above, FIG. 6 shows the relative positions (x) of the stirring chamber 5 and the inflow hole 7, θ×50, θy50, and θX50/
The ratio of θy50 is shown. The spray conditions are air pressure (P a)
3 kg/can”, hydraulic pressure (Pw) 2 kg/cm
”, the spray height H) was set to 75 mm. As a result, the center (axis S) of the inlet hole 7.7 shown in FIG. By the way,
The spray angles θ×50 and θy50 are both maximum, and
The spray had an almost perfect conical shape with θ×50/θy50−1.125. Therefore, as shown in the embodiment shown in FIG. 2, it is most preferable to set the center of the inflow hole 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. collides in the stirring chamber 5, spreads in the Y-axis direction and the Z-axis direction, the spray width expands along the nozzle soirée part 6, and the spray that collides with the bottom of the stirring chamber 5 and is re-reflected is a post-injection. A full cone spray is obtained.

In addition, as shown in FIG.
When placed at the upper end of the
°, an elliptical spray with a spray angle in the X-axis direction of θy=52° is generated.

FIG. 8 shows an embodiment of the pond of the present invention, with nozzle tip 1
As shown in the figure, a stirring chamber is also provided in the portion where the inflow holes 7'' and 7'' overlap the nozzle soirée portion 6'', and a second stirring chamber 10 having a larger diameter than the first stirring chamber 10 on the inside side is provided. The stirring chamber has a two-stage shape. In this case, the centers S of the inflow holes 7' and 7' are connected to the first stirring chamber 10 and the second stirring chamber 11.
It is placed at the intersection (boundary) of The structure of the pond is the same as that of the previous embodiment, so the 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 part 6'. X of gas-liquid mixed two-phase fluid when using the nozzle tip 1
The flow rate distribution in the axial direction and the Y-axis direction was as shown in FIG. 9, and a full conical spray with θ=87° was generated. In addition, when only water is sprayed using the 7 Zuru Chimp 1, θ=92
A full cone spray pattern of 10°C occurred.

In addition, when the spray nozzle using the above-mentioned nozzle tip 1'' was used, when the spray flow rate was varied in the range from 1.5 to SR/min, the spray angle remained almost constant, as shown in Figure 10. . In addition, the droplet diameter in this flow rate range is 150 to 250 microns in Zalator average diameter (d2), and 350 to 450 microns in the case of a general single-fluid nozzle.
It was considerably finer, about half the size of a micron, and had turned into a so-called mist.

Effects of the Invention As is clear from the above explanation, according to the spray nozzle of the present invention, after gas and liquid are mixed, the gas-liquid mixed two-phase fluid flows oppositely into the stirring chamber provided near the spout. By colliding in the stirring chamber in a direction perpendicular to the injection direction and re-reflecting at the bottom of the stirring chamber to generate a post-spray, a full conical spray is 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 drawings]

FIG. 1 shows one embodiment of the spray nozzle of the present invention, (
[) is a cross-sectional view, ([) is a bottom view of (1), and Fig. 2 is a sectional view of (1).
The nozzle tip in the figure is shown, ■) is a cross-sectional view, (n) is a bottom view, Figure 3 is a perspective view showing the spray angle, Figure 4 is a flow rate distribution diagram according to the spray angle in Figure 3, and Figure 5 is a 6 is a cross-sectional view showing the dimensional relationship of the nozzle tip, FIG. 6 is a diagram showing the relationship between the position of the inlet hole and the effective spray angle, and FIG. 7 is a modified example in which the position of the inlet hole is changed. Cross-sectional view of the nozzle tip, (I
I) is a flow rate distribution diagram using the nozzle chip, FIG. 8 is a sectional view showing an example of the pond of the nozzle chip, FIG. 9 is a flow rate distribution diagram when the nozzle chip shown in FIG. 8 is used, and FIG. Diagram showing the relationship between spray flow rate and spray angle, 11th United Nations) (Vl) is a drawing showing a conventional example. 1... Nozzle tip 2... Cap nut 3... Adapter body 4... Liquid socket 5... Stirring chamber 6...・
- Spout soirée section 10...first stirring chamber 11...
2nd stirring chamber patent applicant Haka Ikeuchi Co., Ltd. 1 agent Patent attorney Aoyama Haga 2 people Figure 5 =528
x=90' 19y=726e=87 θ=920 1st 0=3C)' e=7σ 1 figure e=90' e=110 October 30, 1985 ＝Two＝Two＝Nigakusp
Relationship with the person making the Nosuru 3 amendment Patent applicant address: Shige Building, 7g 6-8-2, Ya7, Nishiten, Kita-ku, Osaka-shi, Osaka Name: Ikeuchi Co., Ltd. Representative Yoshinari Iwamura (1 person Ike) 4 Agents Address Honmachi Building, 2-10 Honmachi, Higashi-ku, Osaka City, Osaka Prefecture -
111111 ri ゛ Name Patent attorney (6214) Aoyama Ao 1) 2 people 1
,・0.・-11---Yu'' 5, -1i Kuzuhimakuga aB attached: Spontaneous 7 Contents of amendment Δ The following parts of the specification have been amended. ``Detailed description of the invention j is corrected as follows. ■Page 4, line 3, ``spray nozzle'', do not insert ``ru''. ■Page 9, line 7, rm21fl stirring chamber 10j is corrected to "2nd stirring chamber 11." - Corrected "Average diameter (d32)" in the 4th line of page 1O to "Average diameter (tb2);". First of all, please correct it.

Claims (3)

[Claims] (1) Gas and liquid are mixed in the center of the flow path provided along the axis of the adapter body, and a nozzle tip is attached to the tip of the flow path, and the nozzle tip has a stirring chamber and a spout soirée. forming a continuous section, and forming an inflow hole through which fluid flows into the stirring chamber from the flow path,
A spray nozzle characterized in that the fluid collides in the stirring chamber and is sprayed along the nozzle soirée part, and is re-reflected on the bottom surface of the stirring chamber and is then sprayed, thereby generating a full conical spray pattern. (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 and a second stirring chamber with a large diameter on the outside, and the axis of the inflow hole is the first stirring chamber. A spray nozzle characterized in that the spray nozzle is aligned with the boundary between a stirring chamber and a second stirring chamber.