JP2001269603A - Fluid jetting nozzle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fluid jetting nozzle capable of enlarging both of the width and the thickness of a jetting pattern in the view from the jetting direction of fluid to enable to perform the cooling work of a steel sheet in a hot rolling process or the works (cleaning, coating, the spreading chemicals, defoaming or the like) in other various processes with the number of the fluid jetting nozzle as small as possible to reduce the cost necessary for the works. SOLUTION: A flow passage 2 is formed in a nozzle main body 1, a fluid jetting groove 3 having the tip part long in the diameter direction is formed to be communicated with the flow passage 2, the flow passage 2 is structured so that a pair of divided flow passages 4 and 5 communicated with the fluid jetting grooves 3 is formed in the nozzle main body 1 and the attitude of a pair of the divided flow passage 4 and 5 is set so as to jet the fluid flowing in a pair of the divided flow passages 4 and 5 to collide with each other on the front face or nearly front face in the fluid jetting nozzle 3 side.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for forming a flow path in a nozzle body, and forming a radially long fluid ejection groove at the end of the nozzle body in a state of communicating with the flow path. Related to the fluid ejection nozzle.

[0002]

2. Description of the Related Art A fluid injection nozzle of this type is used as a means for cooling a steel material in a hot rolling process as an example. In order to obtain a wide injection pattern (a pattern viewed from the injection direction), the above-described fluid injection nozzle is used. As shown in the figure, a fluid ejecting groove is formed at the tip of the nozzle body, which is long in the radial direction at the tip.

Conventionally, as described in Japanese Utility Model Laid-Open Publication No. 6-34851, the above-mentioned fluid injection nozzle has one flow passage communicating with the fluid injection groove in a nozzle body.
A deflector is formed along the axis of the nozzle body, and a deflector orthogonal to the axis is attached to the flow path portion on the tip side of the nozzle body, and the fluid divided by the deflector is directed at a shallow angle in the direction of the axis of the flow path. In this case, the fluid is caused to collide, and the fluid is made turbulent by the collision to be ejected from the fluid ejection groove.

[0004]

According to the above-mentioned conventional structure, the fluids diverted by the deflector collide with each other at a shallow angle in the axial direction of the flow path, so that the repulsive force of both fluids is very small. However, the turbulence due to the collision was insufficient, and it was difficult to increase both the width and the thickness of the spray pattern.

As a result, when used as a means for cooling a steel material in a hot rolling step, for example, a large number of fluid injection nozzles are required, and there is a problem that the cost required for cooling work (equipment cost / operating cost) increases. Was.

An object of the present invention is to provide a fluid ejecting nozzle capable of increasing both the width and the thickness of an ejecting pattern viewed from the ejecting direction of a fluid. Cooling work of the steel sheet in the rolling process and work in various other processes (washing and cleaning)
(Painting, spraying of chemicals, defoaming, etc.) to reduce the cost required for the work.

[0007]

The constitution, operation and effect of the invention according to claim 1 are as follows.

[0008] In the fluid injection nozzle described at the beginning, the flow path is formed by forming a pair of divided flow paths communicating with the fluid injection groove in the nozzle body, and the pair of divided flow paths is formed. The postures of the pair of divided flow paths are set so that fluids flowing through the fluid jetting grooves collide with each other from the front or almost frontal side and are jetted from the fluid jetting grooves. [Function] Since the fluids flowing through the pair of divided flow paths formed in the nozzle body collide with each other from the front or almost the front side on the fluid ejection groove side, the repulsive force of the fluids increases and the turbulence is sufficiently promoted. Accordingly, the fluid can be more easily diffused in the width direction and the longitudinal direction of the fluid ejection groove, and the flow rate distribution in the width direction and the thickness direction of the ejection pattern can be made uniform. Can be.

[Effect] Therefore, the fluid ejection can increase the width and thickness of the ejection pattern in a state where the flow distribution in the width direction and the thickness direction of the ejection pattern viewed from the fluid ejection direction is uniform. Nozzles can be provided so that as few fluid injection nozzles as possible can cool steel plates in the hot rolling process and perform operations in other various processes (washing, painting, spraying chemicals, defoaming, etc.). Thus, the cost required for the work can be reduced.

The construction, operation and effect of the invention according to claim 2 are as follows.

[0011] In the configuration of the invention according to claim 1, the pair of divided flow paths are separately arranged on both outer sides in the width direction of the fluid ejection groove when viewed in the axial direction of the nozzle body,
Each of the divided flow paths guides the fluid in the axial direction of the nozzle body, and further guides the fluid in a direction orthogonal or substantially orthogonal to the longitudinal center portion of the fluid ejection groove when viewed in the axial direction of the nozzle body. The posture of each of the divided flow paths is set in such a manner that fluids from the pair of divided flow paths collide and collide with each other at the longitudinal central portion of the fluid ejection groove.

[Operation] In addition to the same operation as the operation according to the first aspect, the following operation can be obtained.

For example, in a structure in which the posture of each of the divided flow paths is merely set so as to guide the nozzle body in a direction orthogonal or substantially orthogonal to the longitudinal direction of the fluid ejection groove when viewed in the axial direction of the nozzle body, The piping connection port (that is, the fluid intake port) faces the radially outward side of the nozzle body,
When the tip of the pipe is connected to the pipe connection port, the tip side portion of the pipe is spread radially outward of the nozzle body, and the structure around the nozzle body is complicated.

According to a second aspect of the present invention, a pair of divided flow paths are separately disposed on both outer sides in the width direction of the fluid ejection groove when viewed in the axial direction of the nozzle body. Since the position of the divided flow path is set so that the divided flow path guides the fluid in the axial direction of the nozzle body to the tip end side of the nozzle body, the pipe connection port of the nozzle body faces the axial direction of the nozzle body. When the tip of the pipe is connected to the pipe connection port, the pipe can be aligned along the axial direction, and the structure around the nozzle body can be prevented from becoming complicated.

As described above, the fluid guided to the tip end side of the nozzle body is guided so as to be guided in a direction orthogonal or substantially orthogonal to the longitudinal center portion of the fluid ejection groove when viewed in the axial direction of the nozzle body. By setting the posture of the divided flow path, the fluids from the pair of divided flow paths are merged and collided on the longitudinal central portion side of the fluid ejection groove, so that the flow distribution in the width direction and the thickness direction of the ejection pattern is reduced. It can be made more uniform.

[Effect] Therefore, the same effect as the effect of the first aspect can be more easily obtained, and the structure around the nozzle body in the pipe connection state can be simplified. Was.

The structure, operation and effect of the invention according to claim 3 are as follows.

[Configuration] In the configuration according to the second aspect of the present invention, the sectional shape of the terminal end of the divided flow path has a tapered shape narrowed toward the tip end side of the nozzle body, and the tapered shape. The divided flow path is formed such that the top of the ball divided flow path portion is located on the tip end side of the nozzle body.

[Operation] In addition to the same operation as the operation according to the second aspect, the following operation can be obtained.

The sectional shape of the terminal end of the divided flow path is tapered toward the tip end side of the nozzle body, and
Since the top portion of the pre-constricted divided flow path portion is formed in a state where it is located on the tip end side of the nozzle body,
Even when the fluid ejection groove is formed so that the width of the ejection pattern is larger, it is difficult for the water amount in the central portion of the ejection width to be larger than the water amount in the other portions, so that the ejection width is reduced. It is possible to suppress that the water density of the central part of the water is higher than the water density of the other parts.

[Effect] Therefore, the width of the ejection pattern can be increased while the distribution of the flow rate in the width direction and the thickness direction of the ejection pattern viewed from the ejection direction of the fluid is made uniform. It is possible to provide a fluid injection nozzle capable of increasing the thickness of a steel sheet, and to cool a steel plate in a hot rolling process and to perform operations in various other processes (washing, painting, spraying a chemical, and erasing) with as few fluid injection nozzles as possible. (E.g., foam), and the cost required for the operation can be further reduced.

[0022]

Embodiments of the present invention will be described below with reference to the drawings.

[First Embodiment] FIGS. 1, 2, 3, and 4
2 shows a water jet nozzle (corresponding to a fluid jet nozzle) used for cooling steel in the hot rolling step.

In the water injection nozzle, a flow path 2 is formed in a cylindrical brass nozzle body 1 having a rounded tip in a side view, and the tip end of the nozzle body 1 is elongated in a radial direction of the tip. The water jet groove 3 (equivalent to the fluid jet groove) having a constant width is formed into a triangular shape (specifically, a fan shape because the tip end side of the nozzle body 1 is rounded) in a side view, The nozzle body 1 is formed so as to communicate with the passage 2, and a male thread portion 7 for connecting a pipe is formed on the rear end side of the nozzle body 1.

The flow path 2 is formed by forming a pair of divided flow paths 4 and 5 (having a circular cross section) communicating with the water injection groove 3 in the nozzle body 1. , 5 are positioned so that the water flowing in the water jetting groove 3 collides with the water jetting groove 3 from the front or almost the front and jets out from the water jetting groove 3.

More specifically, a pair of divided passages 4 and 5 are separately arranged on both outer sides in the width direction of the water injection groove 3 when viewed in the axial direction of the nozzle body 1. 5 guides water in the axial direction of the nozzle body 1,
Each of the divided flow paths 4 and 5 is guided so as to be guided in a direction orthogonal or substantially orthogonal to the central portion in the longitudinal direction of the water injection groove 3 when viewed in the axial direction.
And the water from the pair of divided flow paths 4 and 5 is configured to collide and collide at the center in the longitudinal direction of the water injection groove 3.

The water jetting groove 3 is formed such that both inner walls 3A in the width direction thereof are parallel to each other, and the inner wall 3A in the width direction is formed by the water jetting thickness angle (thickness of the water jetting pattern). The angle has a function of setting an angle corresponding to the angle.

Further, both inner walls 3 in the longitudinal direction of the water injection groove 3 are formed.
B are formed so that they form a V-shape in side view,
The two inner walls 3B in the longitudinal direction have a function of setting the water spray angle (the angle corresponding to the width of the water spray pattern).

FIGS. 5 and 6 show the measurement results of the flow rate distribution when water is jetted using the water jet nozzle having the above structure.

The injection distance is 200 mm and the injection pressure is 3 kg
/ Cm ² (≒ 29.4 × 10 ⁴ Pa).

In each figure, the horizontal axis represents the distance from the nozzle center, and the vertical axis represents the flow density.

In the figure, the solid line shows the measurement results when water was injected using the water injection nozzle having the above structure, and the broken line shows the measurement results when water was injected using the water injection nozzle having the conventional structure.

The water jet nozzle having the conventional structure is described in
As disclosed in JP-A-34851, one flow path communicating with the water injection groove is formed in the nozzle main body along the axis of the nozzle main body, and the flow path portion on the tip end side of the nozzle main body is formed in the nozzle main body. A deflector orthogonal to the axis is attached, and the fluid diverted by the deflector is directed at a shallow angle in the direction of the axis of the flow path to collide with the fluid, turbulent by the collision, and ejected from the fluid ejection groove. Nozzle.

As shown in FIG. 5, in the water injection nozzle having the above structure, the width of the injection pattern can be increased while the flow rate distribution in the width direction of the injection pattern is made uniform, and as shown in FIG. In addition, the thickness of the spray pattern can be increased while the flow rate distribution in the thickness direction of the spray pattern is made uniform.

The water spray angle in the above case is 120
Degrees and the spray thickness angle are 50 degrees.

[Second Embodiment] FIGS. 7, 8, 9, and 1
As shown in FIG. 0, the cross-sectional shape of the end portion of each of the divided flow paths 4 and 5 has a constricted tear shape constricted on the tip end face F side of the nozzle body 1 and the constricted shape of the constricted shape. Split channel part 6
Are formed in such a manner that the top is located on the tip end face F side of the nozzle body 1, and the other structure is the same as the structure of the first embodiment.

For example, the water jetting groove 3 will be described. The two inner walls 3A in the width direction are formed so as to be parallel to each other. (Angle corresponding to the thickness of the pattern).

The two inner walls 3B in the longitudinal direction of the water injection groove 3 are formed so as to form a V-shape in a side view. (The angle corresponding to the width of the pattern).

By setting the cross-sectional shape of the end portions of the divided flow paths 4 and 5 as described above, even when the water injection groove 3 is formed so that the width of the injection pattern becomes larger, It is less likely that the amount of water in the central portion of the injection width is greater than the amount of water in the other portions, and it is possible to suppress the amount of water in the central portion of the injection width from being higher than the amount of water in the other portions. it can.

That is, the width of the spray pattern can be made larger.

FIGS. 11 and 12 show the measurement results of the flow rate distribution when water is injected using the water injection nozzle having the above structure.

The injection distance is 200 mm and the injection pressure is 3 kg
/ Cm (≒ 29.4 × 10 ⁴ Pa).

In each figure, the horizontal axis represents the distance from the nozzle center, and the vertical axis represents the flow density.

In the figure, the solid line shows the measurement results when water was injected using the water injection nozzle having the above structure, and the broken line shows the measurement results when water was injected using the water injection nozzle having the conventional structure.

The water jet nozzle having the conventional structure is the same as the water jet nozzle having the conventional structure in the first embodiment.

As shown in FIG. 11, in the water jet nozzle having the above-mentioned structure, the width of the jet pattern can be made larger while the flow rate distribution in the jet pattern width direction is made uniform, and as shown in FIG. In addition, the thickness of the spray pattern can be increased while the flow rate distribution in the thickness direction of the spray pattern is made uniform.

The water injection angle in the above case is 150
Degrees and the spray thickness angle are 50 degrees.

[Another Embodiment of First and Second Embodiments] In the first and second embodiments, both inner walls 3A in the width direction of the water injection groove 3 are formed to be parallel to each other. However, both the inner walls 3A in the width direction may be formed in a V-shape in a side view, that is, in a widened shape.

By forming the two inner walls 3A in a V-shape when viewed from the side as described above, the water spray thickness angle can be further increased.

The angle formed by the two inner walls 3B in the longitudinal direction of the water injection groove 3 is the angle in each of the above embodiments (the angle at which the water injection angle becomes 120 degrees (in the case of the first embodiment). ) Or the angle at which the water injection angle becomes 150 degrees (in the case of the second embodiment), for example, the angle formed by both the inner walls 3B in the longitudinal direction is set to be larger than the above case. By doing so, it is possible to further increase the water spray angle.

The fluid may be a gas or a gas-liquid mixture in addition to a liquid such as water.

The fluid injection nozzle according to the present invention can be used not only as a means for cooling a steel sheet in a hot rolling process but also as a means in other various processes, for example, for washing, painting, spraying a chemical, and defoaming. Can be used.

[Brief description of the drawings]

FIG. 1 is a plan view of a fluid ejection nozzle.

FIG. 2 is a front view of a fluid ejection nozzle.

FIG. 3 is a cross-sectional plan view of a fluid ejection nozzle.

FIG. 4 is a view taken along line AA in FIG. 3;

FIG. 5 is a diagram showing a flow rate distribution in an injection width direction.

FIG. 6 is a diagram showing a flow rate distribution in a spray thickness direction.

FIG. 7 is a plan view of a fluid ejection nozzle according to a second embodiment.

FIG. 8 is a front view of a fluid ejection nozzle according to a second embodiment.

FIG. 9 is a cross-sectional plan view of a fluid ejection nozzle according to a second embodiment.

FIG. 10 is a view taken along the line AA in FIG. 9;

FIG. 11 is a diagram showing a flow rate distribution in an injection width direction in a second embodiment.

FIG. 12 is a view showing a flow rate distribution in a spray thickness direction in a second embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Nozzle main body 2 Flow path 3 Fluid ejection groove 4, 5 Divided flow path 6 Divided flow path part F Tip surface of nozzle main body

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Akio Fujibayashi 1 Kobe-cho, Fukuyama-shi, Hiroshima Japan Nippon Kokan Co., Ltd. F-term (reference) 4F033 AA05 CA02 NA01

Claims (3)

[Claims] 1. A fluid ejection nozzle having a flow path formed in a nozzle body, and a fluid ejection groove formed in a distal end portion of the nozzle body and extending in a radial direction of the distal end portion so as to communicate with the flow path. The flow path is configured by forming a pair of divided flow paths communicating with the fluid ejection groove in the nozzle body, and the fluid flowing through the pair of divided flow paths is on the fluid ejection groove side. A fluid ejection nozzle in which the posture of the pair of divided flow paths is set such that the pair of divided passages collide with each other from the front or substantially from the front and eject from the fluid ejection groove. 2. The pair of divided flow paths are separately arranged on both outer sides in the width direction of the fluid ejection groove when viewed in the axial direction of the nozzle main body, and each divided flow path supplies a fluid to the nozzle main body. The position of each of the divided flow paths is set so as to guide in the axial direction, and further, to guide in the direction orthogonal or substantially orthogonal to the longitudinal center portion of the fluid ejection groove when viewed in the axial direction of the nozzle body. The fluid ejection nozzle according to claim 1, wherein fluids from the pair of divided flow paths collide and collide with each other at a central portion in the longitudinal direction of the fluid ejection groove. 3. A sectional shape of a terminal end portion of the divided flow path has a tapered shape narrowed toward a tip end surface of the nozzle body.
3. The fluid jet nozzle according to claim 2, wherein the divided flow path is formed such that the top of the divided flow path portion that is tapered is located on the tip end surface side of the nozzle body.