JPH02237670A - Gas-liquid spray nozzle - Google Patents

Abstract

PURPOSE:To uniformly inject mixed gas and liq. by inserting a liq. inlet pipe so that its front end reaches the front end of a gas inlet pipe and reducing the inner diameter of a mixture supply pipe toward a nozzle main body. CONSTITUTION:A gas-liq. spray nozzle 1 is provided with the gas inlet pipe 2, and the liq. inlet pipe 3 is inserted into the gas inlet pipe 2 so that its front end reaches the front end of the gas inlet pipe 2. A surface 6 tapered radially and forward is provided on the inner periphery of the mixture supply pipe 5, and a gas current introduced from the circumferential part of the mixture supply pipe 5 is sent toward the center of the mixture supply pipe 5 along the tapered surface 6. The gas current sent toward the center along the tapered surface 6 collides with a liq. current from the liq. inlet pipe 3, and the liq. is fluidized by the gas current and crushed in the mixture supply pipe 5. The liq. is crushed by the high-speed gas current, and the liq. is uniformly distributed in the gas current by the narrowed gas-liq. passage.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a gas-liquid spray nozzle that simultaneously ejects a gas such as air and a liquid such as aqueous liquid.

This type of gas-liquid spray nozzle can be effectively used for secondary cooling during continuous casting. 8 (Prior Art) As a conventional gas-liquid spraying nozzle of this type, for example, one disclosed in Japanese Utility Model Application Publication No. 59-135852 can be cited.

In the gas-liquid spray nozzle disclosed herein, as shown in FIG. 5, a nozzle body I2 is attached to the front end of a mixing supply pipe 1l, an air introduction pipe 13 is connected to the rear end, and a water supply pipe is connected to the rear end. An introduction tube 14 is inserted in the axial direction. According to this configuration, air and water are mixed by being supplied from the air introduction pipe I3 at the rear side and the water introduction pipe I4 at the rear end.
1, gas and liquid are simultaneously ejected from the nozzle body 12.

In addition, in this configuration, in order to eject gas and liquid uniformly,
The ejection orifice of the nozzle body 12 is made small in diameter, or a core is used inside the nozzle body.

(Problems to be Solved by the Invention) However, in the conventional gas-liquid spray nozzle described above, the ejection orifice of the nozzle body 12 has a small diameter or has a core, so the amount of air supplied to the mixing supply pipe 1l is increased. However, there is a problem in that the energy burden is large, that is, a large compressor with a large capacity is required for air supply. If the compressor becomes large and has a large capacity, the installation cost of the secondary cooling system will increase, and the power consumption will also increase, resulting in higher costs.

Furthermore, if the ejection orifice has a small diameter or has a core, the orifice may become clogged with limescale or other foreign matter, causing the problem that gas and liquid cannot be ejected smoothly and uniformly. Furthermore, there is a problem that the jetting angle from the jetting orifice is not constant depending on the amount of water, and the jetting pattern is not stabilized.

However, even if the present invention aims to eject gas and liquid uniformly, it does not increase the energy burden and can prevent an increase in cost.In addition, it is not necessary to make the ejection orifice small in diameter, so that the ejection can be achieved. It is an object of the present invention to provide a gas-liquid spray nozzle that does not cause clogging of the orifice and can stabilize the gas-liquid spray pattern.

(Means for Solving the Problems) In order to achieve the above object, in the present invention, a liquid introduction pipe is inserted into the gas introduction pipe, and the gas and liquid are mixed through the supply mixing pipe. In a spray nozzle that ejects gas and liquid from the ejection orifice of a connected nozzle body, the liquid introduction pipe is inserted so that the front end reaches near the front end of the gas introduction pipe, and the inner surface of the supply mixing pipe is close to the nozzle main body. It is characterized by being narrowed in direction.

(Function) According to the gas-liquid spray nozzle of the present invention configured as described above, the liquid introduction pipe is made substantially the same length as the gas introduction pipe, and gas and liquid are simultaneously supplied to the supply mixing pipe. Since the liquid can be mixed in the supply mixing tube, there is no pulsation phenomenon in the supply mixing tube as in conventional products, and the inner surface of the supply mixing tube is narrowed toward the front, so that the liquid flows around the liquid until just before it enters the supply mixing tube. Immediately after the gas stream enters the feed mixing tube, it collides with the liquid stream that tends to flow in the center of the feed mixing tube, resulting in a so-called strong crushing action, so it is especially important to use a small caliber for the ejection orifice. , it becomes possible to eject at least a uniform mixture of gas and liquid.

(Example) Figures 1 and 2 (a). Referring to (b), the gas-liquid spray nozzle 1 is equipped with a gas introduction pipe 2,
A liquid introduction tube 3 is inserted into the gas introduction tube 2 so that its front end reaches substantially the same position as the front end of the gas introduction tube 2. Preferably, the liquid introduction tube 3 extends coaxially within the gas introduction tube 2 and is held separated from the gas introduction tube 2 by a spacer 4 inserted between the liquid introduction tube 3 and the gas introduction tube 2.

Further, the front end of the gas introduction pipe 2 is connected to the rear end of the hollow supply mixing pipe 5, and at this time, the front end of the liquid introduction pipe 3 is close to the rear opening of the supply mixing pipe 5.

In this case, the gas introduction tube 2 and the liquid introduction tube 3 extend to substantially the same length, and they are not mixed before the supply mixing tube 5, so that the pulsations that tend to occur when mixing gas and liquid occur in the gas introduction tube 2. There is no such thing as occurring. In addition, gas and liquid flow into the supply mixing tube 5 from each of the gas introduction tube 2 and the liquid introduction tube 3 at substantially the same time.

The inner peripheral surface of the supply mixing tube 5 is provided with a tapered surface 6 that is inclined radially inwardly and in the front direction.
A gas flow flowing in from the circumference of the tube is directed toward the center of the supply mixing tube 5 along the tapered surface 6. At this time, the supply mixing pipe 5
The gas flow directed toward the center along the Taber surface 6 collides with the liquid flow from the liquid introduction tube 3, which is directed toward the center of the tube and tends to flow toward the center. The feed mixing tube 5 is arranged so that the flowing liquid is crushed. By pulverizing the liquid with the high-speed gas flow and narrowing the gas-liquid flow path in this way, the liquid can be uniformly distributed in the gas flow.

Further, a connecting pipe 7 is connected to the front part of the supply mixing pipe 5, if necessary, and a nozzle body 8 is attached thereto. In this case, the nozzle body 8 can also be connected directly to the front end of the feed mixing tube 5 . In the present invention, various configurations can be adopted for the nozzle body 8 regardless of the shape and diameter of the spray orifice, and in particular, since the liquid is uniformly distributed and mixed in the gas flow, the spray orifice can be made small. For example, Fig. 2(a). The water can be sprayed from the spray orifice 9 of the nozzle body 8 in a flat pattern with a mountain-shaped water volume distribution as shown in (b). Of course, Figure 3(a). The water may be sprayed from the spray orifice 9a of another nozzle body 8a as shown in (b) in a flat pattern with a uniform water volume distribution.
Also, Fig. 4(a). A two-hole type nozzle body 8b having a pair of spray orifices 9b and 9b' as shown in (b) may be employed to provide a relatively wide spray pattern.

In this case, since the spray orifice can have a large diameter no matter which type of nozzle body is adopted, a spray pattern in which gas and liquid are evenly distributed can be realized without increasing the energy burden for gas supply. That will be understood.

Various tests were conducted on the above-mentioned gas-liquid spray nozzle of the present invention. Here, when both the amount of water as a liquid and the amount of air as a gas are low, the distance from the nozzle in the width direction (direction perpendicular to the jetting direction from the orifice of the nozzle body and the longitudinal direction of the spray pattern) and the amount of water are The relationship between
Figure 6(a) shows the relationship between the distance in the middle direction from the nozzle and the water volume when the water volume is high and the air volume is low, but under the same conditions as above. Figure 8 shows the test results conducted on conventional gas-liquid spray nozzles.
a). As is clear from comparing (b) with both figures,
While the spray of conventional products is uneven,
It has been found that according to the present invention, substantially uniform spraying can be carried out even when the supply conditions of the amount of water and the amount of air are not relatively favorable. In addition, according to the conventional product, when the amount of water was increased as shown in Fig. 9, the atomization was poor unless the amount of air was increased accordingly, but with the present invention, the amount of air is increased by ION va.
It has been found that good atomization can be achieved over the entire area, regardless of the amount of water, when the amount of water exceeds 100%/Hr.

In addition, in the above-mentioned gas-liquid atomizing nozzle, the taper 6 is provided on the inner circumferential surface of the supply mixing pipe 5, but the inner surface of the supply pipe is narrowed toward the nozzle body, that is, the supply mixture is tapered toward the nozzle body. Substantially the same effect can be obtained by configuring the mixing tube 5 so that the flow path area at the outlet portion is smaller than the flow path area at the inlet portion. Therefore, the shape of the inner surface of the supply mixing tube 5 is not limited to the tapered surface 6, but may also have a configuration in which, for example, the inlet part has a large diameter while the outlet part has a small diameter, with a stepped part interposed in the middle.

(Effects of the Invention) According to the gas-liquid spray nozzle of the present invention configured as described above, a spray pattern in which gas and liquid are uniformly distributed and mixed can be obtained without increasing the energy burden. The compressor for gas supply can be small-sized, which can reduce the installation cost of a secondary cooling system for continuous casting, and also has low power consumption, which can reduce ordinary costs.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway side view of a gas-liquid spray nozzle according to the present invention, FIG. 2(a) is a partial cross-sectional view of the nozzle body, FIG. ) is a front view of another embodiment of the nozzle body, (b) is a side view of the same, FIG. 4(a) is a front view of still another embodiment of the nozzle body, (b) is a side view of the same,
Figure 5 is a sectional view of a conventional gas-liquid spray nozzle, and Figure 6 (a
), (b) and FIG. 7 are graphs showing the operation of the gas-liquid spray nozzle according to the present invention, and FIG. 8(a). (b)
FIG. 9 is a graph showing the operation of conventional gas-liquid spray nozzles. ■... Gas-liquid spray nozzle, 2... Gas introduction pipe, 3...
...Liquid introduction pipe, 4...Spacer, 5...Supply mixing pipe, 6...Tapered surface, 7...Connecting pipe, 8* 8a,
8b... Nozzle body, 9+ 9a+ 9b, 9b
'...spray orifice. Fig. (a) Fig. Fig. Fig. (a) (b) Fig. Fig. No. t. JtFρ゛ et al.'tfili'l=o 工 a
Pouch 1 (mm) (b) Diagram 1 (1/min)

Claims (1)

[Claims] In a spray nozzle, a liquid introduction pipe is inserted into a gas introduction pipe, a gas and a liquid are mixed through a supply mixing pipe, and the gas and liquid are ejected from an ejection orifice of a nozzle body connected to the supply mixing pipe. A nozzle characterized in that a liquid introduction tube is inserted through the gas introduction tube so as to reach near the front end of the gas introduction tube, and the inner surface of the supply mixing tube is narrowed toward the nozzle body.