JP4504641B2 - Spray nozzle and spraying method using the same - Google Patents

Description

  The present invention relates to a spray nozzle useful for cooling (steel material cooling, secondary cooling in continuous casting, etc.) or cleaning (liquid crystal substrate cleaning, etc.) or an object in a rectangular spray pattern. It relates to the spraying method used.

    Depending on the structure of the spray nozzle, it is known that the fluid is sprayed in various spray patterns (for example, a spray pattern of a flat pattern, a full cone (conical) pattern, an elliptical pattern, a regular square pattern, etc.). However, when cooling or cleaning a rectangular object, the rectangular spray pattern has a larger cooling or cleaning area than the flat spray pattern. Therefore, in order to increase the cooling or cleaning efficiency while reducing the number of nozzles, it is advantageous to use rectangular pattern nozzles. In addition, the use of rectangular pattern nozzles can reduce the number of nozzles and the arrangement of nozzles for spraying the entire rectangular object as compared to spray nozzles of a full cone (conical) pattern or an elliptical pattern. Easy.

  In order to form a regular square spray pattern, a spray nozzle is commercially available in which two V-grooves are formed orthogonal to the discharge hole at the tip. FIG. 7 shows a conventional spray nozzle, FIG. 7 (a) is an end view showing the tip of the nozzle body, and FIG. 7 (b) is a schematic side view showing the spray nozzle. The spray nozzle includes a nozzle body 41 in which a discharge hole 42 is formed in the axial center portion of the distal end surface 44, a core (swivel member) 47 attached to an upstream flow path leading to the discharge hole 42, And a threaded portion 50 formed on the outer surface on the upstream side of the nozzle body 41. The core (swivel member) 47 includes a cylindrical cylinder 48 that can be attached to the flow path, and a plurality of spiral concave grooves 49 that extend in the longitudinal direction on the peripheral surface of the cylinder. And in the said discharge hole 42 opened by the front end surface 44, the two V-grooves 46a and 46b which have a 60-degree angle side wall cross | intersect orthogonally. When such a spray nozzle is used, a regular square spray pattern can be obtained. However, in order to cool or wash the rectangular object as a whole, it is necessary to arrange a plurality of nozzles in the longitudinal direction of the object. Therefore, as described above, the number of nozzles is increased, and when a plurality of nozzles are used, a plurality of regular square spray patterns are sprayed in the adjacent spray areas, so that the object is uniform throughout. The object cannot be processed while spraying at a high concentration or density, and the object is locally processed with a high concentration or high density fluid. Further, the fluid cannot be effectively used for processing the object, and the efficiency of using the fluid is reduced. For example, if processing is performed with a regular square spray pattern in conformity with the longitudinal dimension of the target object, the width direction or short side end of the target object cannot be processed with the spray fluid, and the efficiency of use of the fluid is greatly reduced. .

  In Japanese Patent Laid-Open No. 2-172547 (Patent Document 1), a concave groove is formed on the tip surface of the nozzle body over substantially the entire length in the diametrical direction, and the axis of the nozzle body positioned at the center of the groove bottom surface. A jet outlet is opened in the part, and both side walls of the groove are formed as opposed surfaces facing each other with the jet port interposed therebetween. A spray nozzle is disclosed in which spraying is performed with a constant width over substantially the entire length of the above, and a rectangular spray pattern is obtained. This document also describes that when an inclined opening is provided at the opening edge of the jet outlet, the spray angle in the long side direction of the rectangular spray pattern can be controlled by the inclination angle of the inclined opening. Furthermore, it is also described that water leakage can be prevented by curving the cut surface to form a continuous curved surface between the cut surface and the groove bottom surface, or by curving the groove bottom surface.

However, since the spray nozzle uses the collision of the fluid with the cut surface, the spray density increases at both ends in the short side direction of the rectangular spray pattern (spray density distribution), and the spray density is uniform. Sex is reduced. Moreover, since the fluid is made to collide with the cut surface, water droplets fall from the cut surface and water leakage is likely to occur. Furthermore, in order to control the spray pattern, it is necessary to form an inclined opening in the circumferential direction of the opening edge of the jet outlet, which complicates the processing and structure of the spray nozzle body.
Japanese Patent Laid-Open No. 2-172547 (Claims, Fig. 1 (I), Fig. 1 (II))

  Accordingly, an object of the present invention is to provide a spray nozzle and a spray method that can form a rectangular spray pattern with a uniform spray density.

  Another object of the present invention is to provide a spray nozzle and a spray method capable of controlling a rectangular spray pattern with a simple process or structure.

    As a result of intensive studies to achieve the above-mentioned problems, the present inventors have found that a nozzle that sprays a swirling flow from a discharge hole has a rectangular shape when two grooves that intersect at the discharge hole of the nozzle body are formed without being orthogonal to each other. The inventors have found that a spray pattern can be obtained, and that the spray pattern can be controlled by the crossing angle of two grooves and the depth (or width) of the groove, and the present invention has been completed.

That is, the spray nozzle of the present invention is a spray nozzle for spraying the swirling fluid from the discharge holes formed on the end surface (flat surface or inclined surface) of the nozzle body to form a rectangular spray pattern, Two grooves (such as concave grooves) intersect at the discharge hole without being orthogonal to each other. In such a spray nozzle, the intersecting angle of two grooves (such as concave grooves) can be selected according to a rectangular spray pattern, and can be selected from a range of, for example, about 10 to 80 ° (for example, 20 to 70 °). . The depth of the two grooves is, for example, 1: 1 to 1: 4 (for example, 1) with respect to the depth of one groove (such as a concave groove). : 1.2 to 1: 3). The cross-sectional shape of the groove is not particularly limited, and may be various grooves (such as concave grooves) whose depth may be narrower than the opening, for example, a V-groove. Note that the spray nozzle traverses the discharge hole at a predetermined crossing angle, swirling means for swirling the fluid, a discharge hole formed in a tip surface (flat surface or inclined surface) on the downstream side of the swivel means. Two grooves may be provided.

  In such a nozzle, since two grooves intersect and cross the discharge hole, and the two grooves intersect in a non-orthogonal state, a swirl flow of fluid (liquid such as water) is supplied. When ejected from the discharge hole, it is possible to form a clear rectangular spray pattern for spraying while guiding the swirling flow with the side wall of the groove. Therefore, the present invention also includes a spraying method in which a swirl flow of liquid is supplied to the nozzle body and fluid is ejected from the discharge holes to form a rectangular spray pattern.

  In this specification, “rectangle” is used synonymously with “rectangle”.

  In the present invention, since the two grooves cross the discharge hole at a specific angle, a rectangular spray pattern can be formed with a uniform spray density by supplying a swirl flow. Further, the rectangular spray pattern can be controlled only by the groove processing, and the structure is simple and the processing is easy.

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

  FIG. 1 is a schematic partially cutaway perspective view showing an example of the spray nozzle of the present invention, and FIG. 2 is a cross-sectional view showing the spray nozzle of FIG. In this example, water as a fluid is ejected from the discharge hole.

  The spray nozzle of this example is mounted on a nozzle body 1 having a discharge hole 2 opened on the tip surface 4 and a flow path extending upstream from the discharge hole 2 of the nozzle body 1 and generates a swirling flow of fluid. And a mounting screw portion 10 formed on the outer periphery of the other end portion on the upstream side of the nozzle body 1 and for mounting the nozzle body 1 on the water supply unit. . The front end surface 4 of the nozzle body 1 is formed as a flat surface orthogonal to the axis of the nozzle body 1 and forms a rectangular spray nozzle.

  A discharge hole 2 is opened in the axial center portion of the tip surface 4 of the nozzle body 1, and the wall surface of the discharge hole is first through an inclined enlarged wall 3a whose inner diameter increases in the upstream direction. The second wall is continuous with the wall surface of the cylindrical flow path 3b, and has an inner diameter larger than that of the first flow path, and the core (swivel member) 7 is mounted on the upstream side of the first flow path 3b. The cylindrical flow path 3c and the third cylindrical flow path 3d are formed. The discharge hole 2, the inclined enlarged portion 3 a, the first cylindrical channel 3 b, the second cylindrical channel 3 c, and the third cylindrical channel 3 d are formed on the axis of the nozzle body 1.

  In this example, the core (swivel member) 7 is coupled to each other at the shaft core portion of the nozzle body 1 and is in the form of two blades inclined in opposite directions with respect to the flow path or the axis of the nozzle body 1. Guide members (intersecting two blades) 8a, 8b and communication portions 9a, 9b that are formed on the downstream side of the intersecting portions of these blade-shaped guide members 8a, 8b and generate a spiral flow or a swirling flow I have. That is, one of the blade-shaped guide members 8a and 8b crossing each other splits the fluid from the upstream side and guides it upward by an inclined surface (upward guide surface) to generate an upward flow. The member 8b divides the fluid from the upstream side and guides it downward by an inclined surface (downward guide surface) to generate a downward flow. Furthermore, a part of the inclined upward flow is allowed to pass through the inner wall on the downstream side of the intersecting portion of the one member 8a, and the downward flow (and / or the lower guide surface on the back side of the other member 8b) is passed. A communication portion (or a notch) 9a is formed to join the fluid (flowing to the side), and a part of the inclined downward flow is allowed to pass through the inner wall on the downstream side of the intersecting portion of the other member 8b. A communicating portion (or notch portion) 9b is formed for joining with the upward flow (and / or fluid flowing from the upward guide surface to the side of the surface of the one member 8a). Therefore, the fluid from the upstream swirls through the inclined guide surfaces of the blade-shaped guide members 8a and 8b and the communication portions (or notches) 9a and 9b to generate a spiral flow.

  And in order to form a rectangular spray pattern, the discharge hole 2 opened at the front end surface 4 crosses at an angle of 50 to 70 ° without crossing the two V grooves 6a and 6b at right angles. . The V grooves 6a and 6b are formed by cutting at the same cutting angle (in this example, an angle of 60 °) (that is, the inclination angles of the side walls of the V grooves 6a and 6b are substantially the same). is there). Further, one of the two V-grooves 6a and 6b is formed deeper than the other groove 6b. Therefore, the width of one V-groove 6a on the inclined surface 5 is wide, and the width of the other V-groove 6b is narrow. In this example, the ratio of the depth of the two V-grooves 6a and 6b (or the width of the grooves 6a and 6b on the inclined surface 5) is about 1: 1.2 to 1: 2.3.

  When the nozzle body 1 is mounted on the water supply unit using the screw portion 10 of such a spray nozzle and a fluid is supplied, a spiral flow or a swirl flow can be generated by the swivel member 8 and supplied to the nozzle body 1. Although the detailed mechanism is not clear, the two V-grooves 6a and 6b having different depths cross the discharge hole 2 opened at the tip surface 4 of the nozzle body 1 in a non-orthogonal form (or angle). A clear rectangular shape (rectangular shape) may be because the swirling of the fluid is restricted by the two V grooves 6a and 6b and the degree of restriction on the turning can be increased by the one V groove 6a compared to the other V groove 6b. ) Spray pattern can be formed with high accuracy.

  The spray nozzle of the present invention may be composed of a nozzle body as long as a swirl flow or a spiral flow can be supplied. The end surface of the nozzle body may be formed on a non-inclined surface (tip surface or flat surface) orthogonal to the axis, or may have an inclined surface (such as a notched inclined surface) inclined with respect to the axis. .

  As described above, the discharge hole may be opened at the axial center of the tip surface of the nozzle body, or may be opened at a portion (for example, an inclined surface) shifted from the axial center of the tip surface.

  FIG. 3 is a schematic partially cutaway perspective view showing an example of the spray nozzle of the present invention, and FIG. 4 is a cross-sectional view showing the spray nozzle of FIG. In addition, the same code | symbol is attached | subjected and demonstrated to the member and element which are the same as or common to the spray nozzle shown in FIG.1 and FIG.2.

  The spray nozzle of this example is mounted on a nozzle body 11 having a discharge hole 12 opened on the inclined surface 15 of the tip surface 14, and a flow path extending in the upstream direction from the discharge hole 12 of the nozzle body 11, and swirling the fluid. A core (swivel member) 7 for generating a flow, and an attachment screw portion 20 formed on the outer periphery of the other end portion on the upstream side of the nozzle body 11 and for mounting the nozzle body 1 to a water supply unit; It has.

  In order to spray water in an oblique direction with respect to the axis (or tip surface 14) of the nozzle body 11, the tip surface 14 of the nozzle body 11 is formed with an inclined surface 15 inclined at an angle of about 20 °. The discharge hole 12 extends in a direction perpendicular to the inclined surface. In other words, the discharge hole 12 is formed with an inclination of about 20 ° with respect to the axis of the nozzle body 11, and the discharge hole 12 is opened at a portion off the axis of the tip surface 14. As described above, the wall surface of the discharge hole 12 is connected to the inclined enlarged wall 3a whose inner diameter increases in the upstream direction and the wall surface of the first cylindrical channel 3b. On the upstream side, a second cylindrical flow path 3c having an inner diameter larger than that of the first flow path and having the core (swivel member) 7 attached thereto is formed. The discharge hole, the inclined enlarged portion, the first cylindrical flow path, and the second cylindrical flow path are formed in the axis of the nozzle body.

  The core (swivel member) 7 is coupled to each other at the axial core portion of the nozzle body 11 in the same manner as in FIGS. Two blade-shaped guide members (intersecting two blades) 8a, 8b, and communication portions 9a, which are formed on the downstream side of the intersection of these blade-shaped guide members 8a, 8b and for generating a spiral flow or a swirl flow, 9b.

  Then, in order to form a rectangular spray pattern, the discharge holes 12 opened at the inclined surface 15 cross each other at an angle of 50 to 60 ° without the two V grooves 16a and 16b being orthogonal to each other. . The V grooves 16a and 6b are formed by cutting at the same cutting angle (in this example, an angle of 60 °) (that is, the inclination angles of the side walls of the V grooves 16a and 16b are substantially the same). is there). Further, one groove 16a of the two V grooves 16a and 16b is formed deeper than the other groove 16b. Therefore, the width of one V-groove 16a on the inclined surface 15 is wide, and the width of the other V-groove 16b is narrow. In this example, the ratio of the depth of the two V-grooves 16a and 16b (or the width of the grooves 16a and 16b on the inclined surface 15) is about 1: 1.2 to 1: 2.3.

  Even in such a spray nozzle, a spiral flow or a swirling flow generated by the swirling member 7 is supplied to the nozzle body 11 and sprayed in a pyramid shape from the discharge hole 12 in the same manner as described above, thereby forming a clear rectangular shape (rectangular shape). Spray pattern can be formed with high accuracy. Further, since the discharge hole 12 inclined with respect to the axis of the nozzle body 11 is opened at the inclined surface 15, oblique spraying, that is, spraying in a pyramid shape obliquely with respect to the axis of the nozzle body 11 can be performed.

  In addition, when the discharge hole is opened at a portion shifted in the radial direction from the axial center of the tip surface, the inclination angle of the discharge hole with respect to the axis of the spray nozzle body can be selected according to a desired spray angle, for example, The angle may be about 0 to 45 ° (for example, 5 to 30 °).

  The inner diameter (orifice diameter) of the discharge hole can be selected from the range of about 0.5 to 50 mm according to the spray flow rate, the spray angle, etc., and may be about 1 to 50 mm (for example, 1 to 25 mm). About 10 mm may be sufficient.

  The cross-sectional shape of a groove (such as a concave groove) that intersects and crosses the discharge hole is not particularly limited, and the opening and the deep part may be a substantially U-shaped cross section (or rectangular recess) having the same width. , A groove whose depth is narrowed with respect to the opening, for example, a groove whose inner diameter narrows continuously or stepwise toward the deep part (for example, a groove that narrows linearly (such as a V-groove)), a groove that narrows while being curved (U-groove or Or a curved groove).

  FIG. 5 shows still another example of the spray nozzle of the present invention, FIG. 5 (a) is an end view showing the tip of the nozzle body, and FIG. 5 (b) is a schematic side view showing the spray nozzle. In addition, the same code | symbol is attached | subjected and demonstrated to the same or common member as the spray nozzle shown in FIGS.

  In this spray nozzle, a discharge hole 22 is opened in the shaft core portion of the tip surface 24 (tip surface 4) of the nozzle body 21 in the same manner as the shaft core portion of the tip surface 4 of the spray nozzle shown in FIGS. The discharge hole communicates with a second cylindrical flow path in which a core (swivel member) 17 is mounted. In this example as well, the discharge hole 22, the inclined enlarged portion, the first cylindrical flow path, and the second cylindrical flow path are formed in the axial center of the nozzle body 21, as described above. The (swivel member) 17 includes a cylindrical cylinder 18 that can be mounted on the second cylindrical flow path, and a plurality of spiral concave grooves (grooves) 19 that extend in the longitudinal direction on the peripheral surface of the cylindrical body. It is configured. Further, on the upstream side of the spray nozzle (or nozzle body), a screw portion 20 for connection to the water supply unit is formed.

  And in the said discharge hole 22 opened by the front end surface 24, two cross-section U-shaped (or curved) groove | channels 26a and 26b cross | intersect and cross | intersect at an angle of 50-70 degrees. In the U-shaped cross section, the inner angle (inclination angle) of the straight line connecting the center of the curved bottom of the groove and the open end of the groove is about 60 °, as described above. The crossing angles and depth ratios of the grooves 26a and 26b are the same as described above.

  FIG. 6 shows another example of the spray nozzle of the present invention, FIG. 6 (a) is an end view showing the tip of the nozzle body, and FIG. 6 (b) is a schematic side view showing the spray nozzle. In addition, the same code | symbol is attached | subjected and demonstrated to the same or common member as the spray nozzle shown in FIG.

  In this example, a U-shaped or rectangular groove is formed instead of the V-shaped groove or U-shaped groove. That is, the spray hole 32 is opened at the axial center portion of the distal end surface 34, the core (swivel member) 17 is attached to the upstream flow path, and the screw portion 20 is formed on the upstream outer periphery. In the nozzle, in the discharge hole 32, the grooves 36a and 36b having a U-shaped cross section intersect each other at an angle of 50 to 70 ° without crossing each other. The crossing angle and depth ratio of the two grooves 36a and 36b are the same as described above.

  Even with such a spray nozzle, a swirling flow is ejected from the discharge hole, so that the spray density is uniform and can be sprayed in a rectangular pattern depending on the groove shape, the groove depth ratio, and the like.

  As described above, the cross-sectional shape of the groove is not particularly limited, but a V-groove is advantageous in order to improve the groove processing accuracy by cutting. Moreover, in said example, although the same kind of groove | channel is made to cross, you may make it cross | intersect combining a different kind of groove | channel. For example, a crossing groove is formed by a combination of a V groove and a U-shaped groove, a combination of a V groove and a U-shaped groove, a combination of a U-shaped groove and a U-shaped groove, etc. Also good.

  Further, the angle of the side wall of the groove (such as a concave groove) (inner angle of the straight line connecting the center of the groove and the opening end of the groove) can be selected according to the fluid flow rate, pressure, desired spray pattern, etc. In many cases, it is 30 to 120 °, preferably 45 to 100 °, more preferably about 60 to 90 °.

  The crossing angle of two grooves (such as concave grooves) that intersect at the discharge hole can be selected according to the flow rate of fluid, pressure, a desired spray pattern, and the like, for example, 10 to 80 ° (for example, 25 to 80 °). The angle may be about 20 to 70 ° (for example, 20 to 60 °), more preferably about 25 to 65 ° (for example, 30 to 65 °). The intersecting portion of the two grooves may be displaced from the central portion of the discharge portion, but is usually often located at the central portion of the discharge hole or the axial core portion of the nozzle body.

  As long as two grooves (such as concave grooves) cross the discharge hole in a non-orthogonal form, the spray pattern can be controlled to be rectangular, so the depth of the two grooves (such as concave grooves) is the same. May also be different. In order to form a rectangular spray pattern with higher accuracy, it is advantageous to adjust the depth of two grooves (such as concave grooves). For example, the depth of one groove (such as a concave groove) is 1: 1 to 1: 4, preferably 1: 1.2 to 1: 3, Preferably, it may be about 1: 1.3 to 1: 2.5 (for example, 1: 1.5 to 1: 2).

  Note that at least one (that is, one or both) of the two grooves crossing the discharge hole has a width (groove opening width at the tip surface or inclined surface) that is wider than the opening diameter of the discharge hole. Usually, the opening width of at least one of the grooves is equal to or less than the opening diameter of the discharge hole. For example, when the opening diameter of the discharge hole is 1, the opening width of one or both of the two grooves having a large depth or width (the opening width of the groove on the tip surface or the inclined surface) is 0.6. -1.5 (e.g., 0.7-1.3, preferably 0.8-1.2), and the opening width of the groove having a small depth or width is 0.1-0. It may be about 9 (for example, 0.2 to 0.8, preferably 0.3 to 0.7).

  In any of the above examples, the wall surface of the discharge hole is linearly formed with respect to the tip surface or the inclined surface of the nozzle body, but the opening diameter of the discharge hole has an opening diameter in the downstream direction. An inclined portion that extends in the radial direction may be formed. The inclined portion may be linearly inclined or curved. Further, the inclination angle of the inclined part and the degree of bending of the bending part can be appropriately selected according to the spray angle and the like.

  As described above, as long as the swirl flow can be supplied to the nozzle body, the spray nozzle of the present invention does not necessarily require swirl means for swirling the fluid. For example, swirling means for generating a swirling flow may be provided upstream of the spray nozzle, and swirling fluid may be supplied to the spray nozzle. The swiveling means is not limited to the two-blade structure or a spiral body having a spiral guide groove, and various swirling structures that generate a swirl or a spiral flow can be employed.

  The spray nozzle may be a two-component type composed of a nozzle body and a core (swivel means) as in the above example, and the nozzle body, the core (swivel means), It may be a three-component type composed of an adapter for attaching the child to the nozzle body. In the two-component type spray nozzle, an attachment means (screw portion or the like) for the fluid supply unit may be formed or mounted on the outer surface or inner surface on the upstream side of the nozzle body. Further, in the two-component type spray nozzle, an attachment means (screw part or the like) for the fluid supply unit may be formed or attached on the outer surface or inner surface on the upstream side of the adapter.

  In the present invention, the spray pattern can be controlled by the cross-sectional shape of the groove, in particular, the relationship between the crossing angle of the two grooves, the depth of the two grooves, or the opening width. For example, depending on the depth of the groove and the like, when the intersecting angle of the two grooves crossing the discharge hole is made small, a narrow rectangular (rectangular) spray pattern can be obtained by supplying the swirling flow. By supplying a swirling flow of liquid to the spray nozzle constituted by such a nozzle body, it is possible to form a rectangular spray pattern by spraying in a pyramid shape from the discharge hole. The ratio of the long side and the short side is not particularly limited as long as the spray pattern is rectangular, but the long side is usually 1.2 to 5 (for example, 1.3 to 4, preferably 1) with respect to the short side 1. .About.5-3), and practically about 1.5-2.5.

  The spray angle (spray angle) is, for example, 20 to 80 degrees (for example, 20 to 75 degrees), preferably 25 to 70 degrees (for example, 30 to 60 degrees) in the rectangular spray pattern. It may be a degree.

  A gas (such as air) can be used as the fluid, but usually a liquid such as water (including high-purity water), a cleaning liquid, an aqueous solution containing a drug, or an organic solvent (such as an acidic, neutral or alkaline drug) Can be used.

  In the present invention, the fluid is usually supplied as a pressurized fluid. The pressure of the liquid (water or the like) may be about 0.01 MPa or more (for example, 0.02 to 2 MPa, preferably 0.03 to 1.5 MPa), and usually 0.04 to 1 MPa (for example, 0.05 to 0.8 MPa).

  The flow rate can be selected from the range of about 0.1 to 10000 L / min depending on the orifice diameter and the like, and is usually 0.5 to 5000 L / min (for example, 1 to 1000 L / min (2 to 500) L / min). It may be about 1 to 100 L / min.

  In this invention, since the nozzle of the said structure is utilized, it can spray to a rectangular pattern with a uniform spray density. Furthermore, the distribution range of the particle diameter (droplet diameter) of the spray particles is narrow, the average droplet diameter is small, and the droplet diameters are relatively uniform. Therefore, the present invention can be used for various applications such as cooling (including rapid cooling), cleaning (including cleaning with a scrubber, acid or alkali cleaning device), dust collection, scattering prevention, fire prevention, and the like.

  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
The spray nozzle shown in FIGS. 1 and 2 was used. The inner diameter of the discharge hole of the nozzle body is 5 mmφ, the crossing angle of the V groove of 60 ° is 60 °, and the ratio of the depth of one V groove (5 mm) to the depth of another V groove (2.5 mm). Is 2: 1. Further, in the upstream direction from the discharge hole, an inclined enlarged wall (angle 120 °), a first cylindrical channel (inner diameter 12 mmφ, length 15 mm), a second cylindrical channel (inner diameter 13 mmφ, length 13 mm), And a third cylindrical flow path (inner diameter 13.1 mmφ, length 1.0 mm) is formed. Further, the swivel member having a two-blade structure includes a pair of blade-shaped guide members (thickness: 3.0 mm) intersecting at an angle of 110 °, and the virtual outer peripheral diameter of the intersecting blade-shaped guide members is 13.0 mm, the shaft The length between both ends in the direction is 12.77 mm, and a communication portion (2.7 mm × 2.7 mm) is formed on the downstream side of the intersecting portion of the blade-shaped guide member.

  Then, water was sprayed at a pressure of 0.3 MPa, a flow rate of 19 L / min, and an injection distance of 200 mm, and the spray pattern and the density distribution of the spray flow rate were examined. The results shown in FIGS. 8 and 9 were obtained. As is apparent from FIGS. 8 and 9, a spray pattern in which the spray area having a flow rate density of 50% or more is a rectangular pattern having a long side of about 260 mm and a short side of about 150 mm is obtained, and the density distribution of the spray flow rate is It was uniform. In particular, in a rectangular spray region having a long side of about 240 mm and a short side of about 120 mm, the flow density is about 75% or more, and the spray density is uniform.

Example 2
The spray nozzle shown in FIGS. 3 and 4 was used. The inner diameter of the discharge hole of the nozzle body is 3 mmφ, the crossing angle of the V groove having an angle of 60 ° is 55 °, and the ratio of the depth of the other V groove to the depth of one V groove is 1.7: 1. . The internal structure of the nozzle body and the structure of the core are the same as in the first embodiment. When water was sprayed at a pressure of 0.2 MPa, a flow rate of 20 L / min, and an injection distance of 400 mm, and the density distribution of the spray pattern and the spray flow rate were examined, the results shown in FIGS. 10 and 11 were obtained. As is apparent from FIGS. 10 and 11, a spray pattern in which the spray area having a flow rate density of 50% or more is a rectangular pattern having a long side of about 4500 mm and a short side of about 300 mm is obtained, and the density distribution of the spray flow rate is It was uniform. In particular, in a rectangular spray region having a long side of about 400 mm and a short side of about 200 mm, the flow density is about 75% or more, and the spray density is uniform.

Comparative Example 1
The spray nozzle shown in FIG. 7 was used. In addition, the inner diameter of the discharge hole of the nozzle body is 3 mmφ, the crossing angle of the V groove having an angle of 60 ° is 90 °, and the ratio of the depth of the other V groove to the depth of one V groove is 1: 1. Further, the internal structure of the nozzle body is the same as that of the first embodiment, and the two-blade structure swivel member (core of the first embodiment) shown in FIG. 1 was used as the core (swivel member). Then, water was sprayed at a pressure of 0.2 MPa, a flow rate of 20 L / min, and a spray distance of 400 mm, and when the spray pattern and the density distribution of the spray flow rate were examined, a square spray pattern was obtained.

FIG. 1 is a schematic partially cutaway perspective view showing an example of the spray nozzle of the present invention. FIG. 2 is a cross-sectional view showing the spray nozzle of FIG. FIG. 3 is a schematic partially cutaway perspective view showing another example of the spray nozzle of the present invention. 4 is a cross-sectional view showing the spray nozzle of FIG. FIG. 5 shows still another example of the spray nozzle of the present invention, FIG. 5 (a) is an end view showing the tip of the nozzle body, and FIG. 5 (b) is a schematic side view showing the spray nozzle. FIG. 6 shows another example of the spray nozzle of the present invention, FIG. 6 (a) is an end view showing the tip of the nozzle body, and FIG. 6 (b) is a schematic side view showing the spray nozzle. FIG. 7 shows a conventional spray nozzle, FIG. 7 (a) is an end view showing the tip of the nozzle body, and FIG. 7 (b) is a schematic side view showing the spray nozzle. FIG. 8 is a graph showing the distribution of spray density in the long side direction in Example 1. FIG. 9 is a graph showing the distribution of spray density in the short side direction in Example 1. FIG. 10 is a graph showing the spray density distribution in the long side direction in Example 2. FIG. 11 is a graph showing the spray density distribution in the short side direction in Example 2.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 11, 21, 31 ... Nozzle body 2, 12, 22, 32 ... Discharge hole 4, 14, 24, 34 ... End face 15 ... Inclined surface 6a, 6b, 16a, 16b ... V groove 7, 17, ... In Child (swivel member)
26a, 26b ... U-shaped groove in cross section 36a, 36b ... U-shaped groove in cross section

Claims (6)

A spray nozzle for spraying a swirling fluid from a discharge hole formed in a flat surface or an inclined surface of a nozzle body to form a rectangular spray pattern, wherein the discharge port is circular in the flat surface or the inclined surface And a spray nozzle in which two grooves intersect at the discharge hole without crossing at right angles.   The spray nozzle according to claim 1, wherein the crossing angle of the two grooves is 10 to 80 °.   The spray nozzle according to claim 1, wherein the depth of one groove is 1: 1 to 1: 4 with respect to the depth of one groove.   The spray nozzle according to claim 1, wherein the groove is a V-groove.   A swirling means for swirling the fluid, a discharge hole formed in a distal end surface on the downstream side of the swirling means, and two grooves crossing the discharge hole at an intersecting angle of 20 to 70 °, The spray nozzle according to claim 1, wherein the depth of the other groove is 1: 1.2 to 1: 3 with respect to the depth of the groove.   A method of supplying a swirling flow of fluid to the spray nozzle according to claim 1 and spraying the fluid in a rectangular spray pattern from discharge holes formed in a flat surface or an inclined surface of the nozzle body.

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