JPS59216649A - Spray nozzle - Google Patents

Abstract

PURPOSE:To spray uniform fine liquid droplets, by symmetrically forming stirring bores to both left and right parts of an inflow line crossing the spray direction of said line at right angles while gradually reducing the leading ends of said bore to allow the same to continue to the orifice of the inflow line. CONSTITUTION:Stirring perforations 14 each having a circular arc cross sectional area are symmetrically provided by drilling to both left and right side parts of the central small diameter part 11b of an inflow line 11 so as to be continuied to the large diameter part 11a thereof. These bores 14 are extended in the vicinity of the lower end of a nozzle in such a state that the inside parts thereof are communicated with the small diameter part 11b of the inflow line and the inside parts slightly above the bottom surfaces 14a thereof are communicated with the orifice part 11c of the inflow line 11 while the bores 14 cross the spray direction of an emitting orifice 13 at right angles. By this mechanism, the separation of gas and a liquid in the vicinity of the emitting orifice is prevented and fine liquid droplets are generated over an entire spray expanse.

Description

[Detailed Description of the Invention] The present invention relates to a spray nozzle, and in particular relates to a spray nozzle that performs wide-angle uniform fan-shaped spray using a gas-liquid mixing method for cooling high-temperature objects such as iron with mist. .

Generally speaking, cooling high-temperature objects such as iron during the manufacturing process 1
In H, a single-fluid nozzle that uses only liquid is used, but with the development of continuous casting, surface cracks have occurred in the single-fluid nozzle due to localized overcooling. In order to prevent this and shorten the manufacturing time, the two-fluid nozzle iC sprays an air-water mixed mist with a uniform spray amount and liquid l+M size over a wider area +C on the object surface than the two-fluid nozzle iC. need to be dispersed.

Prior Art Conventionally, the two-fluid nozzles provided in the above-mentioned 1) have not been satisfactory in terms of uniformity of stream I distribution, size of droplets, spread of mist in the width direction, etc. There wasn't. On the other hand, if a conventionally available wide-angle uniform fan-shaped nozzle as shown in Fig. 1 is used, the uniformity of the flow rate distribution is unstable, and the spread of the mist in the width direction is too large. There was a drawback called L (non-uniformity). That is, the nozzle has a flow path 2 bored along the axis iL of the nozzle body 1.
The tip 2a is rounded, elliptical, or pseudo-circular, and the discharge port 3 is formed by making V cuts 4 from both sides of the hole with the rounded tip. When a gas/water mixture is supplied to the flow path 2 of a nozzle with such a shape, the liquid is incompressible, whereas the gas is compressible, so the gas a flows as it goes toward the small diameter part at the tip. The liquid W is pushed to both sides of the channel and concentrates in the center of the channel. Therefore, the mist sprayed from the discharge port 3 generates fine droplets in a mixed state of air and water on both sides of the spreading direction. , the center becomes mostly liquid, forming droplets of coarse particles, and the width of the mist in the center does not widen.

Purpose of the Invention The present invention has been made in view of the above-mentioned problems, and is intended to prevent the air/water mixture from being separated and sprayed near the discharge port, and to prevent uniform fine droplets from spreading out as a mist. This is to ensure that it is sprayed all over the area.

Structure and operation of the invention In order to achieve the object described in -, the present invention forms an orifice portion by gradually reducing the tip of an inflow path for a steam/water mixture provided along the axis at the center of a nozzle body. At the same time, a pair of front and rear sloped surfaces are provided on both front and rear sides of the top surface of the nozzle body (a pair of front and rear slopes are cut out symmetrically in the direction C, and the tip of the orifice portion of the inflow path is formed from one notch of the slope ii+). An elongated discharge port is formed in the front-rear direction, and the spray direction is the front-rear direction, while stirring holes are formed symmetrically on the left and right outer surfaces perpendicular to the spray direction of the inflow channel, and the tips of the stirring holes are gradually extended. The side part inward from the tip is connected to the orifice part of the inflow passage, and the air-water mixture that has flowed into the stirring hole flows into the tip part (along which the orifice part of the inflow passage is reversed 1, immediately before injection). Stirring the liquid mixture in the inflow path (this prevents gas-liquid separation and allows fine droplets to be dispersed from the discharge holes over the entire direction in which the mist spreads). A spray nozzle is provided.

EXAMPLES Hereinafter, the present invention will be explained in detail with reference to examples shown in FIGS.

The nozzle body 10 has a substantially oval-shaped cross section, and has outer surfaces 10a on both front and rear sides.
is a straight line, and the outer surfaces 10b on both left and right sides are arcuate,
In addition, in the figure, a V-shaped inclined surface 10d is formed symmetrically from the lower tip surface 10C toward the front and rear outer surfaces 10b. Face i
From the center of the oc, it expands in one direction on both the front and rear sides while tilting upward, and at the front and rear outer surfaces 10b, it extends upward while contracting from the tip.

The central part of the nozzle body 10 (in this case, the air-water mixture inflow channel 11 having one opening on the upper surface) is aligned with the axis J1iC of the nozzle body 10.
The same number of holes are drilled upward and downward along the line. The inflow passage 11 has a large diameter part 11a on the upper side and a small diameter part 11b on the lower side, and is provided with an orifice part 11C whose bottom surface is rounded by gradually reducing the tip of the small diameter part 11b. The bottom surface of the nozzle body 10 is located slightly inward from the tip surface 10C of the nozzle body 10. The tip of the orifice portion of the inflow path 11 is
The V-shaped notch opens from the center of the bottom surface to both front and back sides, forming a discharge IJ month 113 in the front and rear direction as shown in the figure, and the spray direction of the mist sprayed from the discharge port 13 is the front and rear direction.

The inner number of the nozzle body 10 is the large diameter part of the inflow passage 11]1
Continuing from a, stirring holes 14 having an arcuate cross section are drilled symmetrically on both left and right sides of the central small diameter portion 11b.

The stirring hole 1 extends along the axis to the vicinity of the lower end of the nozzle body while communicating with the inner side of the small diameter inlet 11b, and the lower end is gradually reduced so that the bottom surface 14a is round. The bottom surface 14a is located adjacent to the bottom surface of the inflow channel in the left and right direction, and the inner side slightly above the bottom surface 14a communicates with the left and right side surfaces 1c of the orifice portion 11C of the inflow channel 11. In this way, the stirring hole 14 is the discharge port 13.
It is arranged in a direction perpendicular to the spray direction.

In the spray nozzle having the above structure, the inflow path 11
From episode 11 on the large diameter part of
The water flows through the stirring holes 14i on both the left and right sides, and flows along the respective shafts. When the steam/water mixture that has flowed into the stirring hole 14 reaches the bottom surface 14aic, it flows backward into the orifice portion 11C of the inflow path 11 communicating along the round bottom surface 14a as shown in the figure. The air-water mixture flowing down the orifice portion 11C of the inflow path 11 is stirred by the inflow liquid RL flowing backward from the stirring hole 14 as shown in FIG. 2(G).

Therefore, the liquid and gas, which were unevenly distributed in the orifice portion 11C with the liquid separated in the center and the gas around, are mixed uniformly by the stirring caused by the backflow from the stirring hole, and are uniformly mixed in the vicinity of the discharge port 13. It becomes a mixture of air and water. Therefore, fine droplets are generated in the air-water mixture over the entire spread of the mist ejected from the discharge port 13. At this time, since the stirring hole is provided in a direction perpendicular to the injection direction, the spreading of the mist in the width direction is not inhibited by the stirring hole, and the mixture of gas and liquid is uniformly spread throughout the spreading direction. Since gas and liquid do not separate in the spreading direction, it is easy to control the flow rate distribution evenly, and the width of the mist becomes wider.

The spray nozzle of the present invention shown in FIG.
Using the conventional spray nozzle shown in the figure, we conducted a comparison experiment on the particle size of the mist and a comparison experiment on the flow rate distribution.

Particle Size Comparison Experiment The spray nozzles shown in Figures 1 and 2 were machined to have the same size inlet and orifice, the same air-water mixture was used, and the air pressure was 4Ki7/af1. When spraying at a liquid pressure of 4 and 9/ca, the mist below the nozzle is as shown in Figure 3, and in the case of conventional example (A) in Figure 1, the average particle diameter of Zaratar is 240μ, In the case of (b) of the present invention in the figure, the same 180μ
Met. From this result, it was proved that the average particle size of the Zaratar was smaller in the case where stirring holes were provided, and that air was mixed into the center of the mist, contributing to the atomization.

Flow distribution comparison experiment In the same way as the above particle size experiment, the orifice shape etc. were processed to the same dimensions, and using the same air/water mixture, the air pressure was 3'Ii'.
/ctR and a liquid pressure of 3 KSl/cJ, the flow rate distribution in the spreading direction of the mist was measured at a spray height of 100 +++ m, and the thickness of the mist was also measured based on the spray pattern. The results are as shown in Fig. 4. In the conventional nozzle shown in Fig. 1 shown in (a), the width is 400 + o + i, the length SL of the uniform part is 8011 un, and the distance from the nozzle is 50%. It became.

Further, the thickness of the core was narrow at the center and was less than 35Wn. In the nozzle of the present invention shown in FIG. 2, (0 vs. (0)i-),
Same as the conventional type (spread over 400+++m,
The length SL of the equal portion is extremely long at 280 m.

Moreover, the thickness of the fog is 50mm at the center, which is thicker than the conventional type. From the above results, in the nozzle of the present invention, the gas and liquid are sufficiently stirred near the orifice, and the mist spread direction 6
Since the mixed liquid of air and water is injected in almost uniform parts, it is easy to stably obtain an even flow rate distribution, and a wide mist is produced.
F. It has been proven that it can be done.

Note that this invention is not limited to the embodiment shown in FIG.
The nozzle body 1 may have a perfect circular cross section as shown in FIG. 5, and the tip K14 of the stirring hole 14 as shown in FIG.
A should have a conical shape and need not necessarily be rounded. As shown in Figure 7, the stirring hole 1a is connected to the inlet passage 11.
Two pieces may be provided in the direction perpendicular to the spray direction '. In this case, the inclined surface 10d of the ``cut'' cut into the nozzle tip surface is not widened toward the outer blade, but is made narrower so that the bottom surface of the stirring hole IZ does not open. Zara 10
As shown in Figure 8, the discharge port 13' may have an elliptical shape that is long in the front-rear direction. The cut is not limited to the ``2''cut; instead, the discharge port may be formed into an elliptical shape by using a U-cut as shown in Fig. 9.

In the modified examples shown in FIGS. 5 to 9 above, other parts have the same structure as in FIG. 2, so the same reference numerals are given and explanations are omitted.

Effects As is clear from the above explanation, 10, according to the spray nozzle C0 of this invention, the air-water mixture in the orifice near the discharge port is symmetrically (L stirring) placed at right angles to the spray direction IC so as to be sufficiently stirred. Because it has a structure with holes,
Discharge]” Separation of gas and liquid in the vicinity is prevented. Therefore, it has the effect of generating fine droplets in a mixed state of air and water over the entire spread of the mist, and the flow has an extremely large effect on the uniformity of distribution, the spread of the mist, etc.

[Brief explanation of the drawing]

Figure 1 shows a conventional spray nozzle. Figure 2 shows the spray nozzle of the present invention; A) is a front view (B) is a side view; −
■ Line sectional view (H) IV-IV line sectional view (G)
Figures 3 (a) and (CI) are drawings showing the results of particle size experiments; Figures 4 (a) and (b) are drawings showing the results of flow rate distribution experiments; The figures show modified examples of the spray nozzle of the present invention.
Figure 7 is a sectional view showing another modification, and Figure 7 is a top view (B) is a bottom view. A) is a bottom view (B) is a cross-sectional view. 10... Nozzle body, 11... Air-water mixture inlet channel. 13...Discharge port, 14...Stirring hole. Patent applicant: Ikeuchi Co., Ltd. and one other person
Patent attorney Aobai Ao and 2 others: ;551
．． '! 1
Figure 6 ga τ9! '1 (Ron 100:91'', 1

Claims (1)

[Claims] (1) The tip of the air-water mixture inflow path provided along the axis at the center of the nozzle body is gradually reduced to form an orifice, and the top surface of the nozzle body is directed toward the G rising force on both front and rear sides. A pair of front and rear sloped surfaces are provided which are symmetrically cut out, and a discharge port which is long in the front and rear direction is formed at the tip of the orifice portion of the inflow path from the notch io of the slope, and the spray direction is the front and rear direction. Both left and right sides perpendicular to the spray direction of the inflow channel (
This symmetrical LL stirring hole is formed, and the tip of the stirring hole is gradually reduced, and the side part inward from the tip is connected to the orifice of the inflow path, so that the air/water mixture that flows into the stirring hole IC flows into the tip. ) A spray nozzle characterized in that the liquid mixture in the inflow path is agitated immediately before being sprayed by flowing backward through the orifice portion of the inflow path.