JPH03238062A - Air-liquid spray nozzle - Google Patents

Abstract

PURPOSE:To well spray an air-liquid mixture by mounting a nozzle part having a jet orifice to a mixer and providing a control orifice to an air source capable of changing an air flow rate. CONSTITUTION:In a mixer 1, a water stream collides with the air stream flowing along the center axis thereof and, at this time, water is dropped to flow to a nozzle part 2 while carried by the air stream and discharged from a jet orifice 5 with a spray angle theta and a spray pattern. When the size of a material to be treated is reduced at the time of secondary cooling work, the air feed pressure to a control air introducing part 7 is increased according to the reduction degree of the size of the material by a pressure control valve 20 and air is injected with an air flow rate corresponding to the air feed pressures from control orifices 6, 6a. Whereupon, the spray angle theta from the orifice 5 is narrowed and a spray pattern is narrowed according thereto. By this constitution, proper spray action can be always imparted.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a gas-liquid ejection nozzle that ejects a mixed atomized gas of a gas such as air and a liquid such as water.

This type of gas-liquid spray nozzle is used to cool or sprinkle water on semi-finished products or semi-finished products of different widths, and is effectively used, for example, for secondary cooling of cast products in continuous casting operations.

(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.

The gas-liquid spray nozzle disclosed herein includes a mixer 1 having a gas introduction part 3 and a liquid introduction part 14 as shown in FIG.
1 is provided, and a nozzle portion 12 having an ejection orifice 15 is attached to the front part of the mixer 11. Therefore, when gas is introduced into the mixer 11 through the introduction section 13 and liquid is introduced into the mixer 11 through the introduction section 4, they enter the nozzle section 12 while being mixed, and the air-fuel mixture is sprayed from the ejection orifice 15.

(Problems to be Solved by the Invention) When the air-fuel mixture is sprayed from the jet orifice 15, it is generally discharged at a predetermined spray angle θ depending on the shape of the jet orifice 15. This spray angle θ is substantially constant, for example, the size of the material M1 to be secondary cooled and the spray angle θ
That is, if the shape of the ejection orifice 15 is suitable, the fifth
As shown in the figure, the spray is sprayed in the optimal spray pattern IPI for the material, and secondary cooling is performed satisfactorily. On the other hand, the sixth
When the material M2 shown in the figure is smaller than the material M1 shown in FIG. 5 above and falls within the spray angle from the jet orifice 5, in other words, within the spray pattern IP2, the corners of the material M2 become supercooled. There is a problem of uneven cooling. Also, from the point of view of water volume, the amount of invalid water will increase. On the other hand, the material M3 shown in FIG. 7 is larger than the material M shown in FIG. If there is a problem, this part will not be cooled sufficiently, resulting in uneven cooling.

Furthermore, the same thing can be said when a large number of gas-liquid spray nozzles are arranged in series to perform secondary cooling of a relatively long material. That is, if the size of the material M4 matches the spray pattern IP4 formed by a large number of gas-liquid spray nozzles arranged in series as shown in FIG. If the size of the material is smaller than the spray pattern IP5 produced by a large number of gas-liquid spray nozzles arranged in series as shown in FIG. 9, the corners of the material M5 will become supercooled,
There may be a problem with uneven cooling.

It is also possible to replace gas-liquid spray nozzles with spray angles and spray patterns that suit the size of the material to be cooled each time the size of the material to be cooled differs, but it is possible to use gas-liquid spray nozzles with various spray angles There is a problem in that it is necessary to prepare a nozzle for use, and the nozzle replacement work is extremely complicated, and the cost required for the secondary cooling work becomes large.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a configuration that allows a single type of gas-liquid spray nozzle to spray a gas-liquid mixture well onto materials of different sizes.

(Means for Solving the Problem) According to the present invention, the above object is achieved by installing a nozzle portion having an ejection orifice in a mixer having a gas introduction portion and a liquid introduction portion, and introducing gas from the gas introduction portion into the mixer. In a spray nozzle, the gas and liquid introduced from the liquid introduction part are mixed and the gas and liquid are ejected from the ejection orifice of the nozzle, and the air flow from the ejection orifice is adjustable. It is configured by being provided with an adjustment orifice.

(Function) As described above, the present invention is equipped with an adjustment orifice that ejects an air flow that can adjust the ejection angle of gas and liquid from the ejection orifice, so it can be adjusted according to the size of the material to be treated. By varying the air flow rate from the orifice, the jet angle from the jet orifice can be varied to accommodate different sizes of material.

(Embodiment) Referring to FIGS. 1 and 2, the gas-liquid spray nozzle according to the present invention has a hollow mixer 1 and a nozzle part 2 coupled to the front part of the mixer 1. There is. A gas introduction part 3 extending in the direction of the center axis of the mixer 1 and protruding rearward is fixed at the rear end of the mixer 1, and from this introduction part 3 the mixer ↓
The gas introduced therein, especially air, travels straight towards the nozzle section 2.

In addition, a liquid introduction part 4 protruding in a direction perpendicular to the central axis of the mixer 1, that is, in a radial direction, is fixedly installed at a suitable local position of the mixer (2), and the liquid is introduced into the mixer 1 from this introduction part 4. The liquid, especially water, collides with the air flow flowing in the direction of the central axis from a perpendicular direction, and after mixing with the gas, a mixture of gas and liquid, especially a mixture of air and water, is formed. It flows toward the nozzle part 2.

On the other hand, there is an ejection orifice 5 on the front surface, that is, the ejection surface of the nozzle part 2.
is formed, and the gas-liquid mixture flowing toward the nozzle portion 2 is ejected and diffused as atomized gas so as to suitably wet the object to be treated. Further, an adjustment orifice 6.6a is opened in the ejection surface of the nozzle portion 2 at a symmetrical position with the ejection orifice 5 sandwiched therebetween, and located close to the ejection orifice 5. In one embodiment, it has been found that this adjustment orifice 6.6a is optimally located within 10 mm from the end of the ejection orifice 5. The adjusting orifices 6.6a are each arranged in groups of - or more, preferably in groups, and if necessary, the adjusting orifices 6.6a can be arranged on a wall other than the end wall of the outlet orifice 5 in order to increase the adjustment efficiency. By providing this, the effective use of gas is achieved, and it is communicated with the adjustment measure introducing portion 7 fixedly installed at a suitable position around the mixer 1 via a communication path (not shown). The regulated air introduction section 7 itself is connected to a gas source that is separate from the gas source to the gas introduction section 3 and whose gas flow rate can be changed, and the feeding pressure of this gas source is adjusted, for example, to the 12th gas source.
By appropriately adjusting the pressure control valve 20 in the gas-liquid supply system as shown in the figure, the air flow rate from the regulating orifice 6.6a can be suitably changed. In the gas-liquid supply system shown in FIG. 12, air is supplied from the gas source 21 to the gas introduction section 3 via the cut-off valve 22, the flow rate control valve 23, and the flow meter 24, and the cut-off valve 25 and the above-mentioned pressure control Air is supplied to the adjustment introduction part 7 through the valve 20, while liquid is supplied from the liquid pipe 30 to the liquid introduction part 4 through three cutoff valves, a flow meter 32, and a control valve 33.

Further, to explain the operation of the gas-liquid spray nozzle of the present invention, suppose that air is introduced through the introduction section 3 and adjustment introduction section 7, and water is introduced from the introduction section 4. A water stream introduced from a direction perpendicular to the central axis collides with the air stream flowing along the axis, and at this time, the water is turned into droplets, rides on the air stream, flows into the nozzle part 2, and is ejected from the ejection orifice 5. The spray is emitted with a spray angle θ and a spray pattern determined by the shape of 5. At this time, the ejection orifice 5 used has a spray angle and a spray pattern that match the maximum size of the material to be treated. Here, when the size of the material to be treated becomes smaller during the secondary cooling operation, the pressure to be supplied to the adjustment measure introducing section 7 is increased by the pressure control valve 20 according to the degree of reduction in the size of the material, and the adjustment orifice is increased. Air is ejected from 6.6a with an air flow rate corresponding to this supply pressure.

When air is ejected from the adjustment orifice 6.6a, the spray angle θ from the ejection orifice 5 is narrowed, and the spray pattern is narrowed accordingly. In addition, since the amount of ejected air is increased according to the degree of reduction in the size of the material, the spray angle θ
In other words, the spray pattern can be suitably adapted to the size of the material to be treated. For example, if the spray angle θ from the jet orifice 5 is 07°, the adjustment orifice 6.6
Air pressure 1.2kg/cm2 from a, air volume 5ON1
It has been found that when air is ejected for 7 minutes, the spray angle θ can be narrowed to 66°, that is, the spray can be changed from unadjusted spray shown by the solid line in FIG. 3 to adjusted spray shown by the broken line in FIG. In other words, according to the present invention, the spray angle can be narrowed by as much as 40 degrees.

In the above-described configuration, the liquid may be supplied from the introduction section 3 and the gas may be supplied from the introduction section 4. Furthermore, in the above description, the adjustment orifice was arranged at a symmetrical position with respect to the jet orifice 5, but the adjustment orifice 6 or 6
It is also possible to provide only one side of a in the vicinity of the ejection orifice 5. Moreover, when a wide material as shown in FIGS. 8 and 9 is to be treated, the gas-liquid atomizing nozzles according to the present invention are used only at both ends of the gas-liquid atomizing nozzle row, and the other intermediate portions are Conventional nozzles can be used for gas-liquid spraying. At this time, if the gas-liquid spray nozzle having only the above-mentioned - adjustment orifice is placed, for example, at the end of the gas-liquid spray nozzle row shown in FIG. 9 to narrow the spray angle, the material M
It will be understood that this is useful as it can prevent overcooling of the corners of the frame. Moreover, although the gas sources for the introduction section 3 and the adjustment measure introduction section 7 are described above as being provided separately, it is possible to use the same gas source. At this time, it would also be possible to arrange a pressure regulator in the conduit to the adjustment measure introducing section 7.

Further, in the above-mentioned gas-liquid spray nozzle, between the mixer 1- and the nozzle part 2, there is a flow path 1b for the gas/liquid mixture introduced from the introduction part 3.4 and an adjustment orifice as shown in FIG. 6.6a and the flow path 7b communicating with the pre-adjustment introduction section 7
By connecting the connecting bodies 8 having the following shapes, the entire length of the gas-liquid spray nozzle can be made longer. Further, as shown in FIG. 11, the mixer 1 is provided in an elongated shape, and an inner tube 1c is concentrically extended inside the mixer 1 to form a double tube structure, and a flow path 3c communicating with the introduction part 3 is formed.
By defining a flow path 4c that communicates with the introduction section 4 and a flow path 7c that communicates with the adjustment orifice 6.6a and the pre-adjustment introduction section 7, gas and liquid are separated immediately before the nozzle section 2. It is also possible to adopt a configuration in which the two are mixed. In addition, the arrangement of the adjustment orifices 6.6a with respect to the ejection orifice 5 is such that the adjustment orifices 6.6a are arranged in pairs above and below the elongated ejection orifice 5, as shown in FIGS. 13 and 14. It can be configured as follows.

(Effects of the Invention) According to the gas-liquid spray nozzle of the present invention configured as described above, since the spray angle from the ejection orifice 5 can be changed by the gas flowing out from the adjustment orifice, the size of the material to be treated can be adjusted. It is possible to obtain a spray angle and a spray pattern that are suitable for the material, and achieve remarkable effects such as being able to always apply an appropriate spray action to the material.

[Brief explanation of drawings]

FIG. 1 shows an embodiment of a gas-liquid spray nozzle according to the present invention.
A partially cutaway side view, FIG. 2 is a front view of the same, FIG. 3 is an explanatory view of the same, FIG. 4 is a sectional view of a conventional gas-liquid spray nozzle, and FIGS. 5 to 9 are explanations of operation. Figures 10 and 11
The figures are a sectional view of another embodiment of the present invention, FIG. 12 is an explanatory diagram of a gas-liquid supply system, FIG. 13 is a partially cutaway side view of another embodiment of the present invention, and FIG. 14 is a cross-sectional view of another embodiment of the present invention. is a front view of the same. DESCRIPTION OF SYMBOLS 1...Mixer, 2...Nozzle part, 3.4...Introduction part, 5...Ejection orifice, 6.6a...Adjustment orifice, 7...Pre-adjustment introduction part, 20. ...Pressure control valve.

Claims (4)

[Claims] (1) A nozzle part having a jet orifice is attached to a mixer having a gas introduction part and a liquid introduction part, and the gas introduced from the gas introduction part and the liquid introduced from the liquid introduction part are mixed in the mixer. In a spray nozzle that ejects gas and liquid from the ejection orifice of the nozzle part, there is an adjustment orifice that ejects an air flow that can adjust the spray angle of the gas and liquid from the ejection orifice without impairing the mist atomization state or distribution. Nozzle provided. (2) The gas-liquid atomizing nozzle according to claim 1, wherein the regulating orifice is separate from the gas source to the gas introduction part and communicated with a gas source that can vary the flow rate of the ejected gas. (3) The adjustment orifice is provided adjacently to the ejection orifice on the ejection surface of the nozzle part.
The gas-liquid spray nozzle according to item 1 or 2. (4) The gas-liquid spray nozzle according to claim 1 or 2, wherein one or more adjustment orifices are disposed on the ejection surface of the nozzle part so as to sandwich the ejection orifice.