JPH0233426B2 - SUPUREENOZURU - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a spray nozzle, and in particular to a single-fluid type spray nozzle using only liquid and a gas-liquid mixed type elliptical spray nozzle for cooling a high-temperature object such as iron. This invention relates to a spray nozzle that performs atomization.

Conventional technology Conventionally, when cooling high-temperature objects such as iron during the manufacturing process, a single-fluid nozzle that uses only liquid has been used, but with the development of continuous casting, single-fluid nozzles are capable of reducing localized supercooling. Surface cracks and nozzle clogging have occurred due to such factors. In order to prevent these problems and shorten manufacturing time, recently, two-fluid nozzles are often used in place of conventional one-fluid nozzles. However, conventional gas-liquid mixing type two-fluid spray nozzles are mainly manufactured for slabs and perform wide-angle fan-shaped spray, and many have the structure shown in FIG. 10. The spray nozzle has an orifice 3 formed at the tip of a main hole 2 formed in the center of a nozzle body 1, and a notch 4 provided from the top surface of the body 1 so as to communicate with the orifice 3. As shown in FIG. 11A, in this spray nozzle, when only liquid (water) is used, the spray width is almost constant and the spray angle θm is about 6 degrees (however, the water pressure is 3 Kg/cm ² ), B
As shown in the figure, it is possible to widen the angle up to about 20° with gas-liquid mixing (water + air) (however, the water pressure is 6 kg/
cm ² , air pressure is 4Kg/cm ² ), it becomes difficult to expand further. Therefore, when the distance between the rolls is wider than that of a slab such as a bloom or billet, and it is necessary to spread the spray in the width direction, a spray nozzle having a so-called elliptical spray pattern with a wide spray width is required.

This type of elliptical spray nozzle has been produced for one-fluid use, but there is no one for two-fluid use, and a core is used in the nozzle to swirl the liquid to create an elliptical spray. Since the structure is such that the core is generated, there was a problem that the core could become clogged.

Purpose of the Invention The present invention aims to solve the above-mentioned conventional problems, and can be used for both one-fluid and two-fluid applications, and does not use a core unlike the conventional elliptical spray nozzle. Another object of the present invention is to provide an elliptical atomizing spray nozzle that can prevent clogging by increasing the size of the discharge port and can further increase the width of the spray.

Composition of the Invention This invention was made to achieve the above-mentioned object, and instead of swirling the liquid, the liquid collides with the liquid to spread it out into a fan shape, and a straight flow is injected into the colliding part to agitate the mist. , the width of the spray is widened. Specifically, independent main holes are provided along the nozzle axis at equal intervals from the center of the nozzle body, and the tip of each main hole is gradually reduced to form an orifice part.
A notch is provided on the top surface of the nozzle body that communicates with the mutually opposing half sides of both of the orifice parts, and two discharge ports are formed adjacent to each other with a center partition between them,
By colliding the opposing fluids injected from the outer orifices of each discharge port, the spray is spread in a fan shape in the length direction, and the mist is stirred near the discharge ports by the straight flow jetted along the central partition wall. , widening the width of the spray perpendicular to the length direction, and providing a stirring sub-hole in the direction of the nozzle axis in communication with the outer wall of each of the main holes, and gradually reducing the tip of the sub-hole. , the spray is characterized in that its tip part is communicated with the orifice part of the main hole, the fluid flows back from the sub-hole to the orifice part of the main hole, and the fluid just before being jetted is stirred from the discharge port of the main hole. It provides a nozzle.

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

Spray nozzle 10 of the first embodiment shown in FIG.
, a large-diameter inlet hole 12 with an upper surface opening is vertically bored in the center of a cylindrical nozzle body 11 along the axis S, and the lower end of the inlet hole 12 is communicated with the center point of the nozzle body. Independent main holes 13 and 14 are formed in the vertical direction along the nozzle axis S and are spaced apart from each other by an equal distance from O. The tips of each of the main holes 13 and 14, which extend to the vicinity of the lower surface of the nozzle body 12, are gradually reduced to form orifice portions 13a and 14a. A cutout 15 is provided inwardly from the center of the lower surface (top surface) of the nozzle body 12 and communicates with substantially half sides of the opposing inner sides of the two orifice portions 13a and 14a. The notch 15
As shown in the figure, it has a U-shape with an arcuate tip, and the orifice portion 13 is located on both sides of the arcuate portion of the tip.
Two half-moon-shaped discharge ports 16 and 17 as shown in the figure are symmetrically formed adjacent to each other with a central partition wall 18 in between, communicating with the inner arcuate portions of the inner circular arc portions a and 14a.
At this time, the tips 13b, 14b of the orifice portions 13a, 14a are not communicated with the notch 15, but are located outside the discharge ports 16, 17.

With the above-described structure, the fluid flowing into the main holes 13 and 14 from the inflow hole 12 flows along the tip shape of the orifice portions 13a and 14a outside the respective discharge ports 16 and 17 at the tip thereof.
Fluid is injected from 6 and 17, and the fluids injected in opposite directions in the direction of the arrow X in the figure collide at the center and spread the spray in a fan shape in the length direction. Further, it flows along the central partition wall 18, and the discharge ports 16,
The collided mist near the discharge port is further agitated by a rectilinear flow (direction of arrow Y in the figure) injected from the inside of the nozzle 17, and the spray is spread in the width direction perpendicular to the length direction. In this way, as shown in Fig. 2, the spray is spread in the length direction at the injection angle θw, and
By spreading the spray in the width direction at the spray angle θn,
Elliptical spraying is performed. The flow rate distribution of the elliptical spray is as shown in FIG. 2B, and the flow rate distribution and spray angle are as shown in FIG. 2C.

When only water flows into the spray nozzle 10 and is used as a single fluid (water pressure = 3 kg/cm ² ), the flow rate distribution in the width direction of the spray is as shown in Fig. 3A, and the spray angle θn = 18 On the other hand, when water and air are introduced and used for two fluids (water pressure =
6 Kg/cm ² , air pressure = 4 Kg/cm ² ) as shown in FIG. 3B, the spray angle θn = 40°, and the spray width is about three times larger than in the case of a single fluid.

The second embodiment shown in FIG.
Sub-holes 19 and 20 for stirring are provided on the outside of 4'. That is, in communication with the lower end of the inflow hole 12', sub-holes 19 and 20 having an arcuate cross section are formed in the outer walls of the main holes 13' and 14' along the axis S and parallel to the main hole, and the main holes 13' and 14' are parallel to each other. 14', and are bored in communication with each other. Orifice portions 19a, 20a which gradually reduce in size are also formed at the tips of these sub-holes 19, 20, and the orifices 13'a, 14' of the main holes 13', 14' are formed inside the tips 19b, 20b of the orifice portions. a
The orifice portions 13'a and 14'a of the main hole form discharge ports 16' and 17' by cutouts 15' as in the first embodiment.

In the second embodiment described above, the fluid flowing into the sub-holes 19, 20 flows through the main holes 13', 13', 20a, 20a, 20a, 20a,
The fluid flows backward into the orifice portions 13'a and 14'a of the discharge outlet 14', forms a vortex as shown, and further agitates the fluid near the discharge ports 16' and 17'. In this way, the spray width can be made wider by agitating the flow X and the straight flow Y that collide with each other in the same way as in the first embodiment, and the vortex flow Z in the vicinity of the discharge port. That is, as shown in Fig. 5, when used as a single fluid using only water (water pressure = 3 Kg/cm ² ), the injection angle in the width direction θn = 30°, making it a two-fluid using water and air. Hours (water pressure = 6
Kg/cm ² , air pressure 4Kg/cm ² ) is the injection angle θn in the width direction.
=40°.

In addition, the case of the first embodiment without subhole and the case of the second embodiment are as follows.
The example with sub-holes was used for two fluids (water pressure = 1 to 9 Kg/cm ² , air pressure = 4 Kg/cm 2 ).
cm ² ), the relationship between the spray flow rate (1/min) and the spray angle θw in the longitudinal direction is as shown in Figure 6A, and the relationship between the spray flow rate and the spray angle θn in the width direction is compared. The result was as shown in Figure 6B. From the above results, in the case of the secondary hole, the air is stirred up to the center of the discharge hole, so there is almost no change in the jet angle in the length direction and width direction.
A substantially constant elliptical spray pattern can be maintained even if the spray flow rate is greatly changed.

The third embodiment shown in FIG. 7 is a modification example in which there is no sub-hole, and the nozzle body 11'' of this embodiment has a substantially oval shape in cross section, the front and rear both outer surfaces are linear, and the nozzle body 11'' of this embodiment has a substantially oval shape in cross section, the front and rear outer surfaces are straight, and the left and right sides are straight. The outer surface has an arc shape, and the lower surface forms an inclined surface 11''b cut symmetrically from the top surface 11'' toward the front and rear outer surfaces. Similarly, main holes 13'' and 14'' communicating with the inflow hole 12'' are bored, and orifice portions 13''a and 14'' are formed at the tips of these holes.
In addition, an inclined surface 11"b is formed at the center of the top surface 11'a, perpendicular to the longitudinal direction of the top surface.
A notch 15' is provided so as to cut into the orifice portions 13''a and 14''a, and the notch 15'' communicates with the inner side of the orifice portions 13''a and 14''a, and two adjacent and symmetrical discharge ports 16'',
The operation of the spray nozzle is similar to that of the first embodiment, but the notch 15" is provided.
are open on the front and rear inclined surfaces 11''b, so that the spray can be spread more widely in the front and back direction (lengthwise direction).Therefore, as in the first embodiment, the spray can be spread in the width direction and , the spray can be spread out longer in the length direction.

The fourth embodiment shown in FIG. 8 is the same as the third embodiment described above with sub-holes 19'' and 20'' added thereto, and is given the same reference numerals as those of the third embodiment, and the explanation thereof will be omitted. The fourth
In the embodiment, since the sub-hole is provided, the width direction of the spray is more expanded than in the third embodiment.

Figures 9A, B, and C show modified examples of the notches, in which the notch 15' in A has a rectangular cross section with a horizontal tip, and the notch 15'' in B has a V-shaped tip in cross section. , and the notch 15 of C has a cross section V as a whole.
It has a shape.

Effects of the Invention As is clear from the above description, according to the spray nozzle of the present invention, two independent main holes are provided equidistantly apart from the center of the nozzle body, and an orifice portion is provided at the tips of these main holes. At the same time, by providing a notch that communicates with the orifice part and forming two adjacent discharge ports, the spray is sprayed from these two discharge ports facing each other, and the spray reaches the area where it collides. Since the straight streams are further collided with each other, the spray spreads in the width direction, and an elliptical spray can be ensured. Then,
The distance between rolls is wider than slabs such as blooms and billets, so it can be suitably used for cooling over a wider area, and surface cracks can be prevented without locally overcooling. Moreover,
This spray nozzle does not have a core like conventional spray nozzles, so it has a simple structure.Moreover, since the discharge port can be made larger, clogging can be reliably prevented, and it can be used for both one-fluid and two-fluid applications. It has various advantages such as being suitable for use in both cases.

[Brief explanation of drawings]

Fig. 1 shows a first embodiment of the present invention, A is a plan view, B is a cross-sectional view, Fig. 2 shows the operation of the first embodiment, A is an injection direction, and B is a flow rate distribution contour diagram C.
3 is a drawing showing the relationship between flow rate distribution and spray angle, FIG. 3 shows the flow rate distribution in the width direction of the first embodiment, A is a cross-sectional view for one-fluid use, B is a cross-sectional view for two-fluid use, Fig. 4 shows the second embodiment, A is a plan view, B is a sectional view, and Fig. 5 shows the flow rate distribution in the width direction of the second embodiment. Fig. 6 is a cross-sectional view comparing the difference in the effect due to the presence or absence of sub-holes, and A shows the relationship between the spray flow rate and the spray angle in the length direction.B shows the relationship between the spray flow rate and the spray angle in the width direction. Figure 7 shows the third embodiment; A is a top view; B is a bottom view; C is a front view; D is a side view; E is a back view; A is a top view B is a bottom view C is a front view D is a side view E is a back view F is a cross-sectional view of B along a line f'-f' G 9A, B, and C are sectional views showing modified examples of notches; FIG. 10 shows a conventional example; A is a plan view; B is a sectional view; FIG. 11 is a sectional view showing spraying in the width direction of a conventional example. 10... Spray nozzle, 11... Nozzle body, 1
2...Inflow hole, 13, 14...Main hole, 13a, 14a
... Orifice part, 15 ... Notch, 16, 17 ... Discharge port, 18 ... Center partition wall, 19, 20 ... Sub-hole.

Claims (1)

[Scope of Claims] 1 Independent main holes are provided along the nozzle axis at equal intervals from the center of the nozzle body, and the tip of each main hole is gradually reduced to form an orifice part, and the nozzle body A notch is provided in the top surface of the orifice section that communicates with the opposite half sides of both of the orifice sections, and two discharge ports are formed adjacent to each other across the central partition wall, and the outer orifice section of each discharge port is arranged so as to face each other. The collision of the injected fluid spreads the spray in a fan shape in the longitudinal direction, and the straight flow injected along the central partition wall stirs the mist near the discharge port. A spray nozzle that is characterized by an expanded width. 2. In the spray nozzle according to claim 1, a sub-hole for stirring in the direction of the nozzle axis is provided in the outer wall of each of the main holes so as to communicate with the main hole, and the tips of the sub-holes are gradually reduced in size. , the inner side of the tip communicates with the orifice of the main hole, the fluid flows back from the sub-hole to the orifice of the main hole, and the fluid just before being jetted is stirred from the discharge port of the main hole. spray nozzle.