JP2005238029A - Jet nozzle and jet method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a jet nozzle capable of evenly treating a region to be treated even when a fluid is jetted against the region to be treated in an oblique direction to avoid an obstacle above the region to be treated. <P>SOLUTION: The jet nozzle comprises a recessed-groove-like ejection aperture 2 radially extending at the front end of a nozzle body 1, a confluence space 3 being contiguous to the ejection aperture 2, formed in the upstream direction, and crossing or rectangularly crossing the extension direction of the ejection aperture 2, and two passages 4 and 5 extending in the upstream direction from both sides of the confluence space 3 and having different inside diameters. The ratio between the two passage diameters is such that when the diameter of one passage is 100, that of the other passage is 40 to 90 . The two passages each may be composed of two or more passages. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an injection nozzle and an injection method capable of processing an object to be processed (or an object to be injected) with a uniform spray pattern even when a fluid is injected from an oblique direction.

  In order to cool the steel material in the hot rolling process, an injection nozzle that forms a rectangular spray pattern having a spread in the width direction with respect to the traveling direction of the steel material is used. Moreover, when cooling the side wall (or vertical wall surface) of deformed steel materials, such as H-shaped steel, the injection nozzle which forms the rectangular spray pattern which spreads in the advancing direction of steel materials is utilized. In such an injection nozzle, an elongated discharge hole extending in the radial direction is formed at the tip of the nozzle body, and water is injected with the extending direction of the discharge hole directed toward the width direction or the traveling direction of the rolled steel material. .

  Japanese Patent Application Laid-Open No. 2001-269603 (Patent Document 1) includes a flow path formed in a nozzle body, a long fluid ejection groove that communicates with the flow path and extends in the radial direction at the tip of the nozzle body. The flow path includes a pair of divided flow paths communicating with the liquid jet groove, and fluids flowing through the pair of divided flow paths are mutually connected on the liquid jet groove side. A fluid ejection nozzle in which the posture of the pair of divided flow paths is set so as to collide from the front and eject from the fluid ejection groove is disclosed. In this jet nozzle, the jet nozzle is disposed above the rolled steel material, and the fluid can be collided on the liquid jet groove side by jetting the fluid downward from the fluid jet groove of the jet nozzle. Therefore, the flow distribution in the width direction and the thickness direction of the injection pattern can be made uniform, the width and thickness of the spray pattern can be increased, and the rolled steel material can be cooled with a small number of injection nozzles.

However, if there is an obstacle in the upper part of the cooling zone of the rolled steel material, the injection nozzle cannot be attached to the upper part of the cooling zone of the rolled steel material. And when the nozzle body axis is inclined with respect to the cooling zone of the rolled steel material and water is injected from an oblique direction, the spray flow rate in the thickness direction becomes uneven in the injection region, and the eccentricity from the center in the thickness direction toward the nozzle side The spray flow rate at the position increases. Therefore, when there is an obstacle at the upper part of the cooling zone, the cooling zone cannot be uniformly and effectively cooled.
JP 2001-269603 A (Claims)

  Accordingly, an object of the present invention is to provide an injection nozzle (or an injection system) and an injection method (or a method for equalizing an injection flow rate) that can evenly treat a processing area even when fluid is injected from an oblique direction. It is in.

  Another object of the present invention is to provide an injection nozzle (or an injection system) and an injection method capable of evenly processing a processing area with a simple structure even if there is an obstacle above the processing area.

  Still another object of the present invention is to provide a method capable of equalizing the injection flow rate in the width direction and the thickness direction of the spray region even when the fluid is injected from an oblique direction.

  As a result of intensive studies to achieve the above-mentioned problems, the present inventors have supplied fluid from a plurality of flow paths having different flow diameters and ejected the fluid from the discharge holes, and ejected the fluid from an oblique direction with respect to the processing area. Even if it was made to do, it discovered that the injection flow volume in the width direction and thickness direction of an injection area could be equalized, and completed this invention.

  That is, the injection nozzle of the present invention includes a plurality of flow paths formed in the axial direction of the nozzle body, and discharge holes formed in the distal end portion so as to extend in the radial direction, connected to the flow paths. . In such an injection nozzle, the plurality of flow paths are composed of at least two flow paths having different flow path diameters. In such an injection nozzle, the flow rate of the fluid can be increased by using a channel having a large channel diameter. When a fluid from a channel with a large channel diameter and a fluid from a channel with a small channel diameter are collided or mixed and ejected from a discharge hole, a large channel diameter in an ejection region (or a region to be treated) The injection flow rate in the region on the opposite side of the flow path becomes larger. Therefore, when the flow path diameters of the plurality of flow paths are adjusted and the fluid is ejected from an oblique direction with respect to the ejection area, the ejection area (or the area to be processed) can be processed with an equal flow rate.

  A merging space for merging fluids from the plurality of channels may be formed between the plurality of channels and the discharge holes. For example, the flow path is composed of two flow paths having different flow path diameters to form a merge space extending in the adjacent direction of the two flow paths, and the extending direction of the merge space intersects the extending direction of the discharge hole. In this case, fluids from a plurality of flow paths can be merged in the merge space and collided and mixed, and the area to be treated can be processed at an equal flow rate.

  The ratio of the two channel diameters can be selected appropriately. For example, when one channel diameter is 100, the other channel diameter may be about 30 to 90. Further, a groove-shaped discharge hole extending in the radial direction may be formed at the tip of the nozzle body, and the groove-shaped discharge hole may be formed in parallel or inclined with respect to the axial direction of the nozzle body.

  More specifically, the ejection nozzle is formed in a groove-shaped discharge hole formed in the tip end portion of the nozzle body in the radial direction, and is formed in the upstream direction in connection with the groove-shaped discharge hole. A merge space (for example, a mixed space such as a cylinder or a cylinder) extending in a direction intersecting (or perpendicular to) the extending direction of the discharge port, and extending upstream from both sides of the merge space, and Two flow paths having different inner diameters may be provided.

  The present invention also includes an injection system that is configured by the injection nozzle and that injects fluid in an oblique direction with respect to the injection target from the discharge hole of the nozzle body. In this injection system, the axis of the nozzle main body is inclined with respect to the injection target (or injection target area), and the flow path having a large flow path diameter among the plurality of flow paths is positioned inside the inclined nozzle main body. ing. In such a system, even if the fluid is ejected from an oblique direction with respect to the ejected object (or the ejected area), the ejected object (or the ejected area) can be treated equally as described above.

  Furthermore, the present invention avoids the upper side of the injection target, inclines the axis of the nozzle body of the spray nozzle with respect to the injection target, and inclines the flow path having a large flow path diameter among the plurality of flow paths. And a method of supplying a fluid (or a common fluid) to the plurality of flow paths of the spray nozzle and ejecting the fluid in an oblique direction from the discharge hole to the ejected body. . In this method, the fluid can be ejected with the extending direction of the discharge hole at the tip portion directed toward the traveling direction or the width direction of the ejected body. In this method, the fluid can be ejected with the flow rate distribution made uniform in the width direction and the thickness direction.

  Furthermore, the present invention is configured to incline the axis of the nozzle body of the spray nozzle with respect to the ejection target, and to place a channel having a large channel diameter among the plurality of channels inside the inclined nozzle body, By supplying a fluid (or a common fluid) to a plurality of flow paths of the spray nozzle and ejecting the fluid in an oblique direction with respect to the ejection target through the discharge hole, the flow rate distribution is made uniform in the ejection region. Also includes a method. In this method, the flow rate distribution in the width direction and the thickness direction can be made uniform in the injection region.

  In the present invention, since the plurality of channels are configured with channels having different channel diameters, even if the fluid is ejected from an oblique direction with respect to the processing region, the processing region can be processed evenly. Moreover, even if there is an obstacle in the upper part of the processing area, the processing area can be processed uniformly with a simple structure. For example, even if the fluid is ejected from the oblique direction with respect to the treatment area, the spray flow rate (for example, the spray flow rate in the width direction and the thickness direction) in the spray region can be made uniform.

  Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

  FIG. 1 is a schematic perspective view showing an example of a nozzle body of an injection nozzle of the present invention, and FIG. 2 is a schematic cross-sectional view showing the nozzle body of FIG. FIG. 3 is a schematic view showing a spray state by the spray nozzle shown in FIG.

  In this example, an injection nozzle for injecting water as a fluid is shown. The injection nozzle includes a nozzle body 1 including a polygonal columnar portion having a curved peripheral surface formed at a tip portion and a columnar portion extending from the polygonal columnar portion, and the curved peripheral surface of the tip portion of the nozzle body. A concave groove-like discharge hole (or elongated discharge hole) 2 formed extending in the radial direction, a merge space (or collision mixing space) 3 formed in communication with the upstream side of the discharge hole, and this merge It is comprised by the two cylindrical flow paths 4 and 5 extended in the upstream direction from space. A screw portion 6 is formed on the outer peripheral surface of the upstream end portion of the nozzle body 1 to be connected to or connected to a fluid (water in this example) supply unit. , 5 is supplied with a common fluid (in this example, water). That is, fluid is supplied to the two flow paths 4 and 5 at substantially the same speed.

  The merge space 3 forms a cylindrical space extending in a direction orthogonal to the extending direction of the concave groove-like discharge hole 2 at the tip. Further, the two cylindrical flow paths 4 and 5 are formed so that the center axes are equidistant from the axis (center axis) of the nozzle body 1 in the radial direction and parallel to the axis direction of the nozzle body 1. Has been. The two cylindrical flow paths 4 and 5 extend in the upstream direction from both side portions of the cylindrical merge space 3. Further, the flow diameters (inner diameters) of the two cylindrical flow paths 4 and 5 are different from each other. When the inner diameter of one flow path 4 is “100”, the inner diameter of the other flow path 5 is 60 to It is formed in about 90 (especially 70-80). In addition, the inner walls on both sides in the radial direction of the discharge hole 2 are inclined or narrowed inward toward the upstream direction of the nozzle body 1 to reach the side wall of the cylindrical merge space 3. In addition, as shown in FIG. 2, the discharge hole 2 is formed to be inclined with respect to the central axis of the nozzle body 1 in the cross section. That is, the upstream end of the discharge hole 2 (the area adjacent to the merge space) is positioned at the substantially axial center (central axis) of the nozzle body 1, and the open end of the discharge hole 2 is from the axial center (central axis). It is located on the side of the channel 5 with a small channel diameter.

  In this example, the two flow paths are constituted by a first cylindrical flow path having an inner diameter of about 11 to 13 mmφ and a second cylindrical flow path having an inner diameter of 15 to 17 mmφ. Further, the merge space is formed by a cylindrical space having an inner diameter of about 20 to 25 mmφ, and the discharge holes are formed to have a width of 6 to 12 mm and a length in the radial direction of about 30 to 40 mm.

  In such an injection nozzle, when a fluid (water or the like) is supplied to the two flow paths 4 and 5 at substantially the same flow rate (or a common fluid), the flow is larger than that of the second flow path having a small flow path diameter. The flow rate of the fluid flowing through the first flow path having a large path diameter increases. Further, the fluids supplied from the two flow paths 4 and 5 flow in the axial direction (radial direction) of the nozzle body 1 in the merge space 3 while being guided by the two flow paths 4 and 5, and each other from the front direction. Colliding and improving collision mixing efficiency. Therefore, as shown in FIG. 3, the axis of the nozzle body 1 is inclined by an angle θ with respect to the injection target (or injection target area) 10 and has a large channel diameter of the two channels 4 and 5. The first flow path 4 is positioned inside the inclined nozzle body 1 (narrow angle side or angle is less than 90 °), and the fluid from the flow paths 4 and 5 is collided and mixed in the merge space 3. When ejected from the discharge holes 2, a wide or wide-angle rectangular spray pattern can be formed according to the shape of the discharge holes 2. In particular, the axis of the nozzle body 1 is inclined about 30 to 50 ° with respect to the body to be ejected (injected area or to-be-processed area) 10, for example. 1 is positioned on the inner side (narrow angle side) of the inclined nozzle body 1 and water is ejected, it spreads in a wide angle in the extending direction of the discharge hole 2 (width direction with respect to the ejection area), A rectangular spray pattern having a large thickness in a direction orthogonal to the extending direction of the discharge holes 2 (longitudinal direction with respect to the jetted area), in particular, a rectangular spray pattern having a uniform water flow distribution can be formed. Therefore, even if there are obstacles for attaching the nozzle around the object (injection area or processing area) 10 (upper, lower, side, etc.), the nozzle is attached avoiding this obstacle, Even if the axis of the nozzle body is inclined with respect to the injection target (injection area or processing area) 10 and fluid (water) is injected from an oblique direction, the injection target (injection area or processing area) 10 Can be uniformly sprayed.

  For example, in a deformed steel material such as an H-shaped steel material having a side wall formed in the vertical direction (or vertical direction) and an extending wall extending in the horizontal direction (or horizontal direction) from the side wall, the side wall extending in the longitudinal direction is formed. When cooling from above and / or below, the direction of extension of the discharge hole 2 is directed to the traveling direction of the steel material, and the axis of the nozzle body is inclined obliquely above and / or obliquely below the traveling path of the steel material. When the first flow path 4 having a large flow path diameter among the flow paths 4 and 5 is positioned on the inner side (narrow angle side) of the inclined nozzle body 1 and fluid (water) is injected, the length of the side wall of the steel material is increased. A rectangular spray pattern having a wide angle in the direction and a large thickness in the vertical direction of the side wall can be formed. Therefore, even if fluid (water) is sprayed from an oblique direction to the steel material, the side wall of the steel material can be uniformly sprayed.

  Further, with respect to the plate-shaped steel material extending in the longitudinal direction, the first flow path 4 of the two flow paths 4 and 5 is inclined with the extending direction of the discharge hole 2 directed in the width direction of the steel material. When the fluid (water) is sprayed by inclining the axis of the nozzle body at an angle above the traveling path of the steel material and injecting fluid (water), the nozzle body 1 is widened in the width direction of the steel material, and the steel material The steel material can be uniformly sprayed with a rectangular spray pattern having a large thickness in the traveling direction (or longitudinal direction).

  The nozzle body can be formed of a rod-like body extending in the axial direction, and the shape of the nozzle body is not particularly limited. The discharge hole formed in the tip portion of the nozzle body is along a discharge tip formed in the radial direction (radial direction) in the tip portion of various forms, for example, a curved tip portion such as a hemispherical shape or a bulging shape. It may be a curved slit-like discharge hole formed in the above manner, or a slit-like discharge hole formed in a slit shape at a flat tip such as a flat surface or an inclined surface. The discharge hole is usually formed in a groove shape extending in the radial direction at the tip of the nozzle body. The width, length, and depth of the discharge hole are not particularly limited, and the side walls on both sides in the longitudinal direction (or extending direction) of the discharge hole may extend in parallel to the axis of the nozzle body. In order to obtain a wide-angle spray pattern, it is advantageous to extend inwardly (or narrower as it goes inward) to the inner wall of the merge space. That is, the inner walls at both ends in the radial direction of the inner walls of the discharge holes are often tapered (V-shaped, U-shaped, etc.) narrowing linearly or curved toward the upstream direction.

  The inner wall of the discharge hole extending in the radial direction at the tip may be formed parallel to the central axis of the nozzle body, and the taper shape (V-shape) in which the distance between the inner walls facing each other decreases toward the opening end side. Or a U-shape or the like, or a tip-expanded shape (V-shape, U-shape, etc.) in which the distance between the inner walls facing each other increases toward the opening end side.

  Furthermore, when the discharge hole (the direction in which the discharge hole extends in the cross section) is inclined with respect to the axis of the nozzle body, the opening end of the discharge hole does not need to be inclined toward the flow path having a small flow path diameter, and is large. You may incline to the flow path side of a flow path diameter. Furthermore, the discharge hole does not need to be inclined with respect to the axis of the nozzle body, and may extend in parallel to the nozzle axis. The inclination angle of the discharge hole with respect to the axis of the nozzle body may be, for example, 0 to 30 °, preferably 0 to 25 °, and more preferably about 0 to 20 °. If the inclination angle of the discharge hole with respect to the axis of the nozzle body is too large, there may be a case where a rectangular spray pattern having a uniform spray flow rate cannot be formed even when sprayed from an oblique direction with respect to the ejection target.

  FIG. 4 is a schematic cross-sectional view showing a nozzle body of another injection nozzle of the present invention. This injection nozzle includes a nozzle body 11 having a concave groove-like discharge hole 12 formed at the tip, and a first flow path that extends radially in parallel with the axial direction of the nozzle body from the axial center (center axis) of the nozzle body. 14 and the second flow path 15, and a merge space 13 formed between these flow paths and the discharge hole 12. In addition, a screw portion 16 is formed on the outer peripheral portion on the upstream side of the nozzle body in the same manner as described above. Similarly to the above, the merge space 13 is formed in a cylindrical shape extending in the adjacent direction of the two flow paths 14 and 15, and the concave groove-like discharge holes 12 are formed in the extending direction of the cylindrical merge space 13. It extends in a direction perpendicular to the direction. The groove-like discharge hole 12 extends parallel to the axis of the nozzle body 11 at the axial center position of the nozzle body 11 without being inclined with respect to the axis of the nozzle body 11.

  Even in such an injection nozzle, as described above, even if the fluid is ejected by inclining the nozzle body with respect to the region to be ejected, the fluid is collided and mixed in the merging space, and the fluid is discharged in a wide-angle spray pattern from the discharge hole. Injection can be performed, and the injection region can be uniformly injected.

  The joining space is not particularly necessary, but usually, a joining space of a plurality of flow paths is often formed in order to increase collision mixing efficiency. The form of this merging space is not particularly limited as long as fluids from a plurality of flow paths can collide and be mixed, and at least two flow paths with different flow path diameters are often formed in adjacent directions. Further, the extending direction of the merge space does not need to be orthogonal to the extending direction of the discharge holes, and may be crossed, and is usually crossed or orthogonal to the axial direction of the nozzle body. Further, the merge space is not limited to the cylindrical space, and may be a mixed space (or a cylindrical space) such as a polygonal cross section such as a triangular or quadrangular cross section or an elliptical cross section. In order to collide and mix fluids from a plurality of flow paths, the merge space usually extends adjacent to or in the arrangement direction of the plurality of flow paths (or the discharge ports of the plurality of flow paths to the merge space). .

  The plurality of flow paths may be inclined with respect to the axis of the nozzle body, but are usually formed along the axial direction of the nozzle body. The number of the plurality of channels is not particularly limited and may be about 2 to 5, but since the spray flow rate in the injection region can be easily uniformed by controlling the channel diameter, the plurality of channels are usually It can be composed of at least two channels having different channel diameters (particularly, two channels having different channel diameters). When forming a plurality of flow paths, a plurality of flow paths having different flow path diameters may be formed in the radial direction of the nozzle body in order from a flow path having a larger flow path diameter to a flow path having a smaller flow path diameter. A plurality of flow paths may be formed in the radial direction of the nozzle body in order. Furthermore, as long as fluid can collide in the merged or mixed space (or as long as it communicates with the mixed space), the plurality of flow paths do not need to be formed in the radial direction of the nozzle body. It may be formed regularly (for example, in a predetermined pattern such as a vertex of a triangle) or randomly on the upstream end face of the nozzle body.

  The flow path diameter of the plurality of flow paths is a range in which the flow density in the injection area can be made uniform according to the flow rate and pressure of the fluid, the inclination angle of the nozzle body with respect to the vertical axis of the injection target (or injection target area), etc. When the channel diameter of the channel having the largest channel diameter among the plurality of channels is “100”, the channel diameters of the other channels are 10 to 95 (for example, 20 to 90), particularly 25. It can be selected from a range of about ~ 85. More specifically, the ratio of the two flow path diameters can be selected in accordance with the spray pattern and the uniformity of the spray flow rate. Normally, when the flow path diameter of one flow path is “100”, the other flow path diameter is The diameter of the channel is, for example, 30 to 90, preferably 40 to 80, more preferably about 50 to 80, and usually about 60 to 80 (for example, 70 to 80). If the flow path diameter of the other flow path is too small or too large, the nozzle body axis is inclined over a wide range with respect to the spray target body, and the spray target body is efficiently arranged with a rectangular spray pattern having a uniform flow rate distribution. Can not be sprayed.

  Furthermore, the inclination angle of the axis of the nozzle body with respect to the ejected body (processing area) depends on the ratio of the flow path diameters of a plurality of flow paths (for example, two flow paths), the flow rate of fluid to the flow paths, and the like. It can select from the range of about 15-80 degrees with respect to the vertical axis | shaft of a to-be-injected body (processing area), Usually, 15-75 degrees (20-60 degrees), Preferably it is 30-60 degrees (for example, 35-35 degrees). 55 degrees). If the tilt angle of the axis of the nozzle body with respect to the ejected body is too large or too small, the spraying efficiency of the ejected body is often reduced, and it is often difficult to attach the nozzle while avoiding obstacles.

  In addition, the distance (spray distance) of the nozzle body with respect to the injection target (treatment area) is selected from a range of about 50 to 1000 mm (for example, 50 to 700 mm) according to the flow rate, pressure, etc. of the fluid to the flow path. It may be about 100 to 400 mm. If the spray distance is too long or too short, the spray target may not be efficiently sprayed with a uniform flow rate distribution.

  The spray nozzle of the present invention can form a pyramid-shaped spray pattern by supplying a fluid to a plurality of flow paths and ejecting the fluid from the discharge holes in an oblique direction with respect to the ejected object. The flow rate distribution can be made uniform in the sprayed region (or rectangular region) of the spray pattern. Therefore, the spray system of the present invention provided with the spray nozzle is useful as a spray system or a spray method for spraying fluid in an oblique direction with respect to the ejected body from the discharge hole of the nozzle body. In particular, in the present invention, even if there is an obstacle for mounting the injection nozzle above the target body (the target area or the target area), the nozzle of the spray nozzle is avoided by avoiding the upper side of the target body. By attaching the main body and inclining the axis of the nozzle main body with respect to the injection target (the injection target area or the processing target area) and injecting the fluid, the target injection target (the injection target area or the processing target) with a uniform flow distribution Can be sprayed.

  Of the plurality of channels, a channel having a large channel diameter may be positioned obliquely inside the inclined nozzle body, but when positioned inside the inclined nozzle body, the injection region or the processing region The flow distribution of the fluid can be made more uniform. Furthermore, when the fluid is ejected in the direction in which the discharge hole extends at the tip portion in the width direction of the ejected object (or the direction intersecting, in particular perpendicular to, the flow or movement direction of the object to be treated), In the injection region (rectangular injection region) by the spray pattern, the fluid can be injected by making the flow rate distribution uniform in the width direction and the thickness direction.

  Note that the type of fluid is not particularly limited, and can be selected according to the type of the ejected object, such as liquid (water, chemical liquid, binder liquid, etc.), gas (air, oxygen, inert gas, etc.), etc. Good. When a heating body such as a rolled steel sheet is cooled, water is usually used as a fluid. In addition, the fluid may be supplied individually to each flow path, but usually, it is often supplied to a plurality of flow paths as a common fluid (one fluid).

  INDUSTRIAL APPLICABILITY The present invention can be used in various fields such as rolled steel sheet, cooling of a heating body in a combustion or incinerator, cleaning, chemical solution spraying, powder spray granulation, and defoaming. In particular, when there is an obstacle such as a frame or a shield on the upper side of the target object (or target object), it is upstream or downstream with respect to the flow or movement (conveyance) direction of the target object (or target object). It is useful for spraying a fluid in an oblique direction from a direction, spraying it in a pyramid shape, and spraying with a rectangular spray pattern.

  Hereinafter, the present invention will be described in more detail based on examples, but the present invention is not limited to these examples.

Example 1
As the nozzle body shown in FIG. 1, a first cylindrical channel 4 formed in parallel with the central axis at a radial distance of 12.5 mm from the central axis and having an inner diameter of 16 mmφ and a length of 60 mm, and the central axis A second cylindrical flow channel 5 formed in parallel with the central axis at a radial distance of 14 mm and having an inner diameter of 12 mmφ and a length of 60 mm, and a cylinder with an inner diameter of 23 mmφ formed in a direction adjacent to these channels. A nozzle main body having a discharge hole 2 which is formed in a direction perpendicular to the extending direction of the merge space 3 and the extending direction of the merge space and has a width of 10 mm and a radial bending length of 36 mm was used.

  The axis of the nozzle body is inclined at an angle of 40 ° with respect to the vertical axis, and water is supplied to the first and second flow paths under conditions of a pressure of 0.2 MPa and a flow rate of 198 L / min. Water was sprayed at a distance of 180 mm from the tip part to the flat part, and the flow rate distribution in the spray area was examined. In addition, the spray pattern from a nozzle is a pyramid shape, and the shape of the spray area is a rectangular shape. The results are shown in FIGS.

  As shown in FIG. 5, the flow rate distribution is uniform in the wide-angle region in the width direction of the spray region (for example, the distance in the width direction from −400 mm to +400 mm centering on the tip of the nozzle). Further, as shown in FIG. 6, the peak position of the flow rate is shifted to about +200 to 220 mm from the center position of the nozzle tip in the thickness direction (spray direction) of the spray region, and the flow rate is also measured in the thickness direction. The distribution is uniform according to the Gaussian distribution.

Comparative Example 1
Instead of forming the first cylindrical flow channel 4 and the second cylindrical flow channel 5, two cylindrical flow channels each having an inner diameter of 11 mmφ and a length of 60 mm are formed at a radial distance of 11 mm from the central axis. In the same manner as in Example 1, a nozzle body was obtained.

  Then, the axis of the nozzle body is inclined at an angle of 40 ° with respect to the vertical axis, and water is supplied to the first and second flow paths under conditions of a pressure of 0.2 MPa and a flow rate of 135 L / min. Water was sprayed at a distance of 90 mm from the tip to the flat surface, and the flow rate distribution in the spray area was examined. The results are shown in FIGS.

  As is clear from FIGS. 7 and 8, although a relatively uniform flow rate distribution was obtained in the width direction of the spray region, the spray flow rate in the thickness direction (spray direction) has a high peak on the nozzle body side, The flow distribution was uneven.

FIG. 1 is a schematic perspective view showing an example of a nozzle body of an injection nozzle according to the present invention. FIG. 2 is a schematic cross-sectional view showing the nozzle body of FIG. FIG. 3 is a schematic view showing a spray state by the spray nozzle shown in FIG. FIG. 4 is a schematic cross-sectional view showing a nozzle body of another injection nozzle of the present invention. FIG. 5 is a graph showing the flow rate distribution in the width direction in the first embodiment. FIG. 6 is a graph showing the flow rate distribution in the thickness direction in Example 1. FIG. 7 is a graph showing the flow rate distribution in the width direction in Comparative Example 1. FIG. 8 is a graph showing the flow rate distribution in the thickness direction in Comparative Example 1.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,11 ... Nozzle main body 2,12 ... Groove-shaped discharge hole 3,13 ... Merge space 4,5,14,15 ... Flow path

Claims (11)

  An injection nozzle comprising a plurality of flow paths formed in the axial direction of the nozzle body, and discharge holes formed extending in the radial direction at the distal end portion, connected to these flow paths, An injection nozzle in which a flow path is composed of at least two flow paths having different flow path diameters.   The injection nozzle according to claim 1, wherein a joining space for joining fluids from the plurality of flow paths is formed between the plurality of flow paths and the discharge holes.   The flow path is composed of two flow paths having different flow path diameters, the merge space extends in the adjacent direction of the two flow paths, and the extension direction of the merge space is relative to the extension direction of the discharge holes. The injection nozzle according to claim 2, which intersects.   The injection nozzle according to claim 1 or 2, wherein the ratio of the two channel diameters is 30 to 90 when the other channel diameter is 100.   The groove-shaped discharge hole extending in the radial direction is formed at the tip of the nozzle body, and the groove-shaped discharge hole is formed in parallel or inclined with respect to the axial direction of the nozzle body. Injection nozzle.   A groove-shaped discharge hole formed in the distal end portion of the nozzle body extending in the radial direction, and is formed in an upstream direction connected to the groove-shaped discharge hole, and with respect to the extending direction of the groove-shaped discharge hole. The injection nozzle according to claim 1, further comprising a merge space extending in a direction intersecting or orthogonal to each other and two flow paths extending in an upstream direction from both sides of the merge space and having different inner diameters.   An injection system comprising the injection nozzle according to claim 1 and for injecting fluid in an oblique direction from the discharge hole of the nozzle main body to the injection target, wherein the axis of the nozzle main body is directed to the injection target An injection system that is inclined and has a flow path having a large flow diameter among a plurality of flow paths positioned inside the inclined nozzle body.   The nozzle of the spray nozzle according to claim 1 is tilted with respect to the ejected body while avoiding the upper side of the ejected body, and the flow path having a larger flow path diameter among the plurality of flow paths is inclined. A method in which a fluid is supplied to a plurality of flow paths of the spray nozzle and is ejected in an oblique direction with respect to an object to be ejected from a discharge hole.   The method according to claim 8, wherein the fluid is ejected such that the direction in which the discharge hole extends at the tip portion is directed to the width direction of the ejected body.   The method according to claim 8 or 9, wherein the fluid is ejected with the flow rate distribution made uniform in the width direction and the thickness direction.   The axis of the nozzle body of the spray nozzle according to claim 1 is tilted with respect to the injection target, and a channel having a large channel diameter among the plurality of channels is positioned inside the tilted nozzle body, and the spray nozzle A method of making the flow distribution uniform in the injection region by supplying fluid to the plurality of flow paths and injecting the fluid from the discharge holes in an oblique direction with respect to the injection target.

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