JP2020171903A - Multi-hole nozzle and spray method - Google Patents

Abstract

To provide a multi-hole nozzle which is useful for spraying or injecting a fluid in a circumferential direction without adopting a rolling mechanism, and a spray method.SOLUTION: A multi-hole nozzle comprises: a nozzle body 1 having a closed tip; a plurality of slit injection ports (or spray holes, discharge holes) 3a to 3f for injecting a fluid, which are formed in a peripheral wall of the nozzle body 1; and a plurality feed passages 2a to 2f for feeding the fluid to the above injection ports respectively, which are formed in the nozzle body 1. A length (depth from the injection port) D from a terminal end of the feed passage 2a to 2f to a center axis of the injection port 3a to 3f is so formed as to be constant, and also a length Ld from an intersection point of the center axis of the feed passage 2a to 2f and the injection port to the injection port 3a to 3f is so formed as to be constant. In addition, a length L1 to L3 from a starting end of the feed passage 2a to 2f to the intersection point is so formed as to be longer than the length Ld of the injection port.SELECTED DRAWING: Figure 1

Description

The present invention relates to a perforated nozzle and a spraying method (or spraying method) useful for uniformly spraying or spraying a fluid in the circumferential direction and treating an inner wall such as a hollow cross-section member with the fluid.

The spray nozzle usually includes a hollow tubular nozzle body and a discharge hole formed at the tip of the nozzle body. By supplying the liquid to the nozzle body, the liquid is discharged from the discharge hole at the tip. It is sprayed on the object to be treated. However, in such a spray nozzle, the spray area of the liquid is limited by the shape of the discharge hole at the tip of the nozzle, and the liquid cannot be sprayed over a wide range. As a spray nozzle, a nozzle that sprays a liquid in the circumferential direction is also known.

For example, in Japanese Patent Application Laid-Open No. 5-4057 (Patent Document 1), a wax ejection opening is formed in a nozzle body having a supply hole for supplying rust-preventive wax, and the opening is provided outside the nozzle body. A rotary nozzle for spraying is described in which a rotary cylinder is mounted so as to be positioned and rotatable, and a wax discharge port for rotating the rotary cylinder by the outflow pressure of wax is formed on the rotary cylinder. In this document, two slit openings extending in the longitudinal direction are formed on the inner wall of the nozzle body, and wax flows out to the outer peripheral surface of the nozzle body through the slit openings, so that the rotating cylinder has an axial direction and a circumference. A plurality of wax discharge ports (a round hole discharge port and two elongated hole-shaped discharge ports having different major axis directions) are formed by shifting their positions in the directions, and the discharge pressure of wax discharged from these discharge ports. It is described that the rotary cylinder is rotated around the outer peripheral portion of the nozzle body, and that the rotary cylinder and the nozzle body are sealed with an O-ring.

Japanese Patent Application Laid-Open No. 2017-104777 (Patent Document 2) describes a liquid supply shaft tube attached to the tip of the liquid supply pipe, a rotating body rotatably arranged on the outer periphery of the liquid supply shaft pipe, and the above-mentioned supply. A bearing material which is fixed to the tip of the liquid shaft tube and rotatably supports the rotating body is provided, and the liquid supply shaft pipe closes the passage at the central portion in the length direction to form the end of the flow path. A plurality of liquid jets for generating a swirling flow are provided on the peripheral wall of the passage close to the end, and a central annular groove facing the liquid jet is provided on the inner peripheral surface of the central portion of the rotating body. A rotary spray nozzle in which both ends are rotatably fitted and held on the liquid supply shaft tube and the bearing material, and nozzles are formed on the peripheral wall of the central annular groove at intervals in the longitudinal direction and the circumferential direction. Are listed.

However, in these rotary nozzles, since the orifice portion (injection port) is sprayed while rotating, a clearance is required at the connecting portion. Therefore, it is not possible to prevent liquid leakage, the liquid cannot be effectively used for spraying, and it is not suitable for spraying a small amount. On the other hand, in order to prevent liquid leakage, a rotating mechanism and a spraying mechanism in the circumferential direction are required, which complicates the structure.

JP-A-5-4057 (Claim 1, [0010], FIGS. 1 to 4) JP-A-2017-104777 (Claims, FIGS. 1 and 4)

Therefore, an object of the present invention is to provide a porous nozzle (or spray nozzle) and a spray method (or treatment method) useful for spraying or spraying a fluid in the circumferential direction.

Another object of the present invention is a perforated nozzle (or spray nozzle) useful for spraying or injecting a fluid uniformly in the circumferential direction while reliably preventing leakage with a simple structure without adopting a rotation mechanism. And to provide a spraying method.

Yet another object of the present invention is to provide a porous nozzle and a spraying method capable of effectively spraying a liquid even in a small amount.

As a result of diligent studies to achieve the above-mentioned problems, the present inventors have conducted a position in the axial direction at intervals in the circumferential direction in a hollow nozzle body having a closed tip without adopting a rotation mechanism. It was also examined to form a plurality of injection ports in multiple stages with different values. However, even with such a nozzle, the flow rate of the liquid from each injection port could not be made uniform, probably because pressure loss occurred, and the liquid could not be sprayed uniformly in the circumferential direction. In particular, a small amount of liquid could not be sprayed uniformly. As a result of further studies based on such findings, a plurality of supply paths (or inflow paths) extending in the axial direction and having closed ends are formed in the columnar rod body at intervals in the circumferential direction. Then, when a slit-shaped injection port (or discharge hole) is formed on the peripheral wall of the rod body in the circumferential direction by communicating with these inflow paths, the fluid introduced into the inflow path can be injected or sprayed from the slit-shaped injection port. The present invention has been completed by finding that the inner wall of a hollow portion such as a hollow member having a cross section can be uniformly treated.

That is, in the perforated nozzle of the present invention, the tip of the nozzle body is closed; a plurality of injection ports (or spray holes, discharge holes) formed on the peripheral wall of the nozzle body for injecting a fluid; It is formed and includes a flow path for supplying a fluid to these injection ports. The flow path is formed by a plurality of supply paths for supplying a fluid to the plurality of injection ports. That is, the plurality of supply paths communicate with each of the plurality of injection ports, and are separated from each other and formed independently. In such a nozzle, since the plurality of supply paths communicate with each of the plurality of injection ports, the fluid is transmitted from the plurality of injection ports formed on the peripheral wall without causing pressure loss of the fluid in each supply path. Can be sprayed or sprayed in the circumferential direction.

The plurality of injection ports may be formed at appropriate locations on the nozzle body, for example, on the columnar or conical peripheral wall of the nozzle body. The plurality of injection ports may be formed at least in the circumferential direction of the peripheral wall of the nozzle body, for example, at equal intervals in the circumferential direction. Further, the plurality of injection ports may be formed at periodic or regular intervals in the axial direction of the nozzle body as it goes in the circumferential direction of the nozzle body.

Further, the injection port may be formed at an upstream portion (or upstream side) of the terminal portion (tip portion) of the supply path. That is, the supply path may be formed so as to extend linearly toward the tip of the nozzle from the injection port in the axial direction of the nozzle body. In such a form, the flow path or space from the injection port to the terminal portion of the supply path can function as a turbulent flow space, and the fluid from the supply path can be uniformly injected or sprayed from the injection port.

Further, the injection ports are formed in a slit-like shape in which the long axis faces in the circumferential direction, for example, in the shape of elongated holes extending in the circumferential direction of the nozzle body, and among the elongated hole-shaped injection ports, each other in the nozzle axial direction. At least one of the two inner walls facing each other may be bulged and curved in the axial direction of the nozzle.

The central axis of the supply path usually intersects the central axis of the injection port (the central axis of the injection port corresponding to the supply path) at an intersection, and the injection port is the supply path as described above. It may be formed upstream of the terminal portion of. Further, in each supply path, the length from the start end portion of the supply path to the intersection is injected from the intersection of the supply paths (the branch portion where the central axis of the supply path and the central axis of the injection port intersect). It may be formed larger than the length to reach the mouth, and the length from the end of the supply path to the intersection (the central axis of the injection port) (the central axis of the injection port from the bottom or the innermost part of the supply path). The distance to (or the depth of the supply path from the central axis of the injection port) may be substantially constant or the same in each supply path.

More specifically, the perforated nozzle has a plurality of supply paths formed by extending in the axial direction of the rod body at intervals in the circumferential direction of the solid rod body and having a closed end portion, and the rod body. The peripheral wall may be provided with a slit-shaped injection port (spray hole or discharge hole) formed in communication with the supply path and extending in the circumferential direction.

The perforated nozzle of the present invention is useful for spraying or injecting a fluid onto various members for processing. For example, the perforated nozzle can be used to spray a treatment agent as a fluid on the inner wall of a member having at least a curved or bent inner wall, and the treatment member is partially open. It may be a member having a hollow portion. Even with such a member having a hollow inner wall, the fluid can be sprayed onto the hollow inner wall using the perforated nozzle to treat the hollow inner wall.

In the present invention, since the fluid can be supplied from the plurality of supply paths to the plurality of injection ports formed on the peripheral wall of the nozzle body, the fluid can be uniformly injected in the circumferential direction while suppressing the pressure loss. Can be sprayed. Further, it is sufficient to form a plurality of supply paths extending in the axial direction at intervals in the circumferential direction of the rod body forming the nozzle body, and to form injection ports leading to the respective supply paths on the peripheral wall of the rod body. , A porous nozzle with a simple structure can be formed without adopting a rotation mechanism. In particular, the fluid can be sprayed or jetted uniformly in the circumferential direction while reliably preventing leakage. Furthermore, even a small amount of liquid (or treatment agent) can be effectively and uniformly sprayed.

FIG. 1 is a schematic cross-sectional view showing an example of the nozzle body of the present invention. FIG. 2 is a schematic perspective view showing a perforated nozzle provided with the nozzle body of FIG. FIG. 3 shows another example of the nozzle body of the present invention, FIG. 3 (A) is a schematic cross-sectional view of the nozzle body, and FIG. 3 (B) is a virtual portion developed in the circumferential direction along the injection port. It is a development view. FIG. 4 shows still another example of the nozzle body of the present invention, and is a virtual partially developed view developed in the circumferential direction along the injection port. FIG. 5 is a schematic perspective view showing the nozzle used in Comparative Example 1. FIG. 6 is a photograph showing the spray state in Example 1. FIG. 7 is a photograph showing the spray state in Comparative Example 1.

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

FIG. 1 is a schematic cross-sectional view showing an example of a nozzle body of the present invention, and FIG. 2 is a schematic perspective view showing a porous nozzle provided with the nozzle body of FIG.

The perforated nozzle is formed at the nozzle body (or nozzle body) 1 for uniformly injecting or spraying the fluid from a plurality of slit-shaped injection ports formed at equal intervals in the circumferential direction, and at the upstream end of the nozzle body. It is provided with an adapter (or an adapter portion, a large portion) 5 for supplying a liquid to the injection ports 3a to 3f, and is provided with a nozzle body (or nozzle body portion) 1 and an adapter (or adapter portion) 5. Is integrated. In this example, the nozzle body 1 and the adapter 5 are shown separately, but a single cylinder is machined to form a nozzle body corresponding to the nozzle body 1 and an adapter portion corresponding to the adapter 5. And, and the nozzle body and the adapter are integrated to form a nozzle.

The nozzle body 1 extends linearly from one end face of the cylinder 1a in the axial direction at equal intervals in the circumferential direction, and is closed (or the end portion is closed) without penetrating the other end face of the cylinder 1a. (In this example, six supply paths or tubular inflow paths) 2a to 2f, and corresponding to these supply paths, at equal intervals in the circumferential direction on the peripheral wall of the cylindrical body 1a. It is provided with slit-shaped injection ports (six injection ports whose major axes are oriented in the circumferential direction) 3a to 3f, which are formed and communicate with the supply path, and since spraying is performed in the outer peripheral direction, the central axis of each supply path is provided. , It intersects at an intersection (or a branch) orthogonal to the central axis of the injection port corresponding to this supply path.

The plurality of supply paths (tubular inflow paths) 2a to 2f are formed so that the first supply path groups 2a to 2c and the second supply path groups 2d to 2f are adjacent to each other, and the first and second supply paths are formed. In each of the supply paths, the length of the supply path (tubular inflow path) is formed to be larger in order toward the circumferential direction (or clockwise direction). That is, the shortest flow paths 2a and 2d are adjacent to the longest flow paths 2c and 2f of the first and second supply paths. By forming a plurality of supply paths (tubular inflow paths) 2a to 2f in such a form, the liquid is uniformly sprayed in the circumferential direction around the nozzle body 1.

The axial positions of the plurality of injection ports 3a to 3f are also formed at periodic or regular intervals in the axial direction in the circumferential direction, corresponding to the lengths of the plurality of supply paths 2a to 2f. Has been done. More specifically, the injection ports 3a to 3f are formed upstream of the terminal portions of the supply paths 2a to 2f, and are centered from the terminal portions of the supply paths 2a to 2f to the center of the injection ports 3a to 3f. The length to the axis (the length to the intersection or the depth from the injection port) D is formed to be substantially the same or constant, and the stirring space (turbulent space or deep part) at the end (deep part) of the supply paths 2a to 2f is formed. Recessed portions) 4a to 4f are formed. Further, the length Ld from the intersection of the supply paths 2a to 2f (the intersection of the central axis of the supply path and the central axis of the injection port) to the injection ports 3a to 3f is also formed to be substantially the same or constant. Further, in order to stably spray the liquid from the injection ports 3a to 3f, in each of the supply paths 2a to 2f, from the start end of the supply paths 2a to 2f to the intersection (the central axis of the supply path and the central axis of the injection port). (Or the length from the start end located on one end face of the cylinder 1a to the intersection (intersection) between the central axis of the supply path and the central axis of the injection port) L1 to L3 Is formed to be larger than the length Ld from the intersection of the supply passage to the injection port.

The plurality of injection ports 3a to 3f formed at intervals in the axial direction sequentially in the circumferential direction are located in a radial positional relationship with the axis of the nozzle body 1 as the center. Further, when the plurality of injection ports 3a to 3f are viewed from the axial direction of the nozzle body 1, both side portions of the slit-shaped injection ports 3a to 3f adjacent to each other overlap in the circumferential direction, and the slit-shaped injection ports 3a to 3f overlap. The 3f is formed in the shape of an elongated hole extending in the circumferential direction of the nozzle body 1, and of the elongated hole-shaped injection port, both inner walls facing each other in the nozzle axial direction are bulged and curved in the nozzle axial direction. The liquid is sprayed with a uniform spray distribution in the circumferential direction by the plurality of slit-shaped injection ports 3a to 3f formed in such a form.

In such a perforated nozzle (spray nozzle), the liquid can be supplied from the adapter 5 (the adapter integrated with the nozzle body 1) and distributed to the respective supply paths 2a to 2f, and the fluid flows through the respective supply paths 2a to 2f. It can be agitated or turbulent in the agitation space 4a to 4f at the deepest part of the supply paths 2a to 2f while flowing along the water. Further, since the plurality of injection ports 3a to 3f are formed by changing the positions in the axial direction and the circumferential direction, the fluid such as a liquid is uniformly flown in the circumferential direction from the plurality of injection ports 3a to 3f centering on the nozzle body 1. Can be sprayed.

It is sufficient that the nozzle body and the adapter can be integrated, and a single rod body may be processed to form a nozzle body portion corresponding to the nozzle body and an adapter portion corresponding to the adapter to form an integrated nozzle. .. Further, the nozzle may include a nozzle body and an adapter that can be attached to the upstream end of the nozzle body, and the attachment form of the adapter to the nozzle body is not limited to the screwing form using screwing. , The nozzle body and the adapter may be sealed with a sealing member such as an O-ring. As described above, in the present specification, the "nozzle body" and the "adapter" may be integrated or separated from each other. Therefore, the "nozzle body" and the "adapter" can be used synonymously with the "nozzle body" and the "adapter", respectively. Further, since the adapter (or the adapter portion) has a function of supplying or introducing the fluid to the nozzle body (or the nozzle body portion), the adapter (or the adapter portion) can also be referred to as a fluid introduction portion. Further, a forward movement and / or backward movement mechanism such as a cylinder or a screw mechanism may be attached to the adapter (or the adapter portion or the economic portion) to enable the nozzle body to move forward and / or backward. Therefore, the adapter (or the adapter part, the economic part) can be said to be the operation part.

The nozzle body (including the adapter) is not limited to a columnar shape as long as a plurality of supply paths and injection ports can be formed, and has a shape such as a polygonal columnar shape, a conical shape, a polygonal pyramid shape, a truncated cone shape, and a truncated cone shape. May have. The nozzle body often has the form of a rod-shaped body, for example, a cylinder, a cone, a cone cylinder, particularly a cylinder. The plurality of injection ports are formed on the peripheral wall of the nozzle body having a columnar or conical columnar shape, usually on the cylindrical or conical peripheral wall of the nozzle body. The tip of the nozzle body is closed, and the fluid is supplied to the injection port formed on the peripheral wall of the nozzle body through the supply path (inflow path), and the fluid is sprayed or injected from the injection port.

The perforated nozzle is formed in the nozzle body and includes a flow path (inflow path) capable of communicating with the injection port to supply a fluid, and this flow path is provided in a plurality of injection ports (spray hole or discharge hole). Each is formed by a plurality of supply paths (inflow path or introduction path) for supplying a fluid. That is, the plurality of supply paths (inflow path or introduction path) are separated from each other and communicate with the plurality of injection ports.

The plurality of supply paths may be formed from one end surface of the nozzle body (cylindrical body, etc.) so as to extend in the axial direction at equal intervals in the circumferential direction, and may be formed so as to extend in the axial direction at equal intervals in the circumferential direction. There are many. The plurality of supply paths may be formed axially at intervals in the circumferential direction in the central region of the end face of the nozzle body (cylindrical body, etc.), and are usually formed axially at intervals in the circumferential direction in the outer peripheral region. Often formed.

The lengths of the plurality of supply paths may be the same or different in relation to the position of the injection port in the axial direction of the nozzle body, and as described above, the lengths are gradually increased (or deeper) or smaller (or deeper) or smaller (or deeper) in the circumferential direction. Or shallow) may be formed. In a preferred embodiment, the lengths of the plurality of supply paths may be regularly or periodically different in the circumferential direction to spray the fluid uniformly and widely in the circumferential direction; A plurality of supply paths (or flow paths) having different sizes may be formed regularly or periodically in the circumferential direction. For example, a pair of supply paths (a pair of flow paths) of different lengths may be formed sequentially adjacent to each other in the circumferential direction in association with the axial position of the injection port; the length increases in the circumferential direction. A group of supply paths formed by a plurality of supply paths having different lengths (for example, a plurality of supply paths having a large length in sequence) are sequentially adjacent to each other in the circumferential direction (that is, a plurality of supply path groups). Alternatively, such a plurality of supply path groups may be formed in a form of ascending and descending in a multi-step manner on a stepped locus; the length gradually increases in the circumferential direction over the entire circumference. Alternatively, a plurality of smaller supply paths (for example, a plurality of supply paths formed at equal intervals on a spiral locus) may be formed. Normally, a plurality of supply paths (including the pair of supply paths having different lengths) having different axial lengths of the nozzle body are periodically or regularly arranged in the circumferential direction of the nozzle body. In many cases, it is formed as a target. The cross-sectional shape of the supply path is not particularly limited, but it is usually circular in many cases. Further, if necessary, the supply path may be curved or inclined with respect to the axial direction of the nozzle body, but is usually formed so as to extend linearly along the axial direction of the nozzle body. ..

Each supply path is formed with an injection port (spray hole, discharge hole or nozzle orifice), and the injection port (spray hole, discharge hole or nozzle orifice) is formed outward from the peripheral wall of the nozzle body to form the injection port. The central axis and the central axis of the supply path (the supply path corresponding to the injection port) intersect at an intersection (or a branch portion), and usually, the central axis of the injection port and the central axis of the supply path are It often intersects at right angles.

The position of the injection port may be such that the fluid can be sprayed in the circumferential direction by communicating with the supply path, and if only the position in the circumferential direction is considered without considering the position in the axial direction, the plurality of injection ports may be located. For example, they may be formed at intervals in the circumferential direction of the nozzle body, and the intervals of the injection ports in the circumferential direction may be the same or different, and are usually formed at equal intervals in the circumferential direction of the nozzle body. .. For example, the central axes of the plurality of injection ports may be formed in a radial positional relationship with the central axis of the nozzle body as the center, that is, at positions evenly spaced in the circumferential direction.

On the other hand, if the axial position is taken into consideration without considering the circumferential position, the injection ports may be formed, for example, at the same axial position and at intervals in the circumferential direction. In many cases, they are formed at different positions in the axial direction and at intervals in the circumferential direction.

The plurality of injection ports may be formed at intervals in the circumferential direction without changing the positions in the axial direction, but in order to spray the fluid more uniformly in the circumferential direction, both the circumferential direction and the axial direction may be formed. It is often formed at intervals in the direction of. In a preferred embodiment, the plurality of injection ports (orifices) may be formed in multiple stages at intervals in the axial direction of the nozzle body and at intervals (or at equal intervals) in the circumferential direction. That is, the plurality of injection ports (spray holes or nozzle orifices) are formed at different positions (or at intervals) in the axial direction of the nozzle body as they go in the circumferential direction of the nozzle body. In particular, the plurality of injection ports are often formed at equal intervals in the circumferential direction of the nozzle body and at intervals in the axial direction of the nozzle body. As it goes in the circumferential direction, for example, a plurality of injection ports adjacent to each other in the circumferential direction are staggered at intervals in the axial direction of the nozzle body (with different axial positions) as they go in the circumferential direction of the nozzle body. (Or in a staggered form that alternates axially with respect to the imaginary line in the circumferential direction), or may be interspersed in a stepped form that sequentially rises and falls in the upstream or downstream direction. ..

Specifically, as shown in FIG. 3, in the plurality of supply paths of the nozzle body 11, the supply path 12a having a large length and the supply path 12b having a small length are alternately adjacent to each other in the circumferential direction. Slit-shaped injection ports 13a and 13b are opened on the side wall of the nozzle body 11 which is formed so as to extend in the direction and has a predetermined distance D from the end portions of these supply paths 12a and 12b. These slit-shaped injection ports 13a and 13b are axially centered on a virtual line in the circumferential direction, as shown in FIG. 3B, which is a virtual development view for explaining an arrangement form of the injection ports. They are located alternately and show a staggered arrangement. That is, a pair of supply paths having different lengths (a long supply path 12a and a short supply path 12b) communicate with the injection ports 13a and 13b at a certain distance D from the terminal portion in the circumferential direction. A plurality of supply paths may be formed so as to be adjacent to each other in sequence.

In the example shown in FIG. 4, which is a virtual development view, the plurality of supply paths of the nozzle body 21 are sequentially separated from the supply path 22a having the longest length and the supply path 22a having the longest length in the circumferential direction. A plurality of supply paths 22b, 22c having a smaller length (the length gradually increases toward the supply path 22a having the largest length) are provided, and the plurality of supply paths 22a, 22b, 22c are provided. A supply path group is formed, and the supply path group is adjacent to the circumferential direction and has a plurality of supply paths over the entire circumference (a plurality of supplies formed at intervals in the circumferential direction on the circular locus). Road) is formed. The injection ports 23a, 23b, 23c communicating with each supply path are opened at a certain distance from the end portions of the plurality of supply paths 22a, 22b, 22c as described above, and have a curved mountain shape or a wave. They are located on the locus of the shape at intervals in the circumferential direction, and are scattered in a step-like shape that goes up and down. That is, the plurality of injection ports 23a, 23b, 23c have a mountain shape or a mountain shape or a mountain shape at intervals in the axial direction of the nozzle body 21 as they go in the circumferential direction of the nozzle body 21 centering on the supply path 22a having the largest length. It has a form scattered on a wavy locus.

The number and length of the supply path groups are not particularly limited. For example, the number of supply path groups may be about 2 to 10, and the supply path groups may include a plurality of supply paths having different lengths (for example,). , A first supply channel with a large length and a third supply path with a small length; in addition to these two supply channels, a second supply path with an intermediate length is provided. A plurality of supply paths having different lengths such as three supply paths) may be provided, or a plurality of supply paths having different lengths may be arranged periodically or regularly in the circumferential direction as one set. Further, the arrangement state of a plurality of supply paths (one set of supply paths) having different lengths may be such that the fluid can be sprayed uniformly in the circumferential direction, for example, supply paths having the same length in the circumferential direction (for example). , 2nd supply channels, etc.); may be sequentially different in length, such as the arrangement of the 1st supply path, the 2nd supply path, the 3rd supply path; A third supply path may be interposed between the first supply path and the second supply path.

The form of the plurality of injection ports is not limited to the slit-shaped injection port, and may be various forms such as a circular cross section, an elliptical shape, and a rectangular shape. The preferred form of the injection port may be an elongated hole-like form extending in the circumferential direction of the nozzle body, and among the elongated hole-shaped injection ports, at least one inner wall of both inner walls facing each other in the nozzle axis direction is the nozzle shaft. It may bulge in the direction and be curved.

Further, the depth (radial length) of the injection port may be a depth that leads to the supply path, may reach the central axis of the supply path, or the like, and crosses the supply path. You may.

In addition, although a plurality of injection ports may be formed in each supply path at intervals in the axial direction, if a plurality of injection ports are formed at intervals in the axial direction, the pressure drop of the fluid in the axial direction may occur. It may occur and may not be sprayed uniformly. Therefore, in many cases, a single injection port is usually formed in one supply path in a one-to-one relationship. That is, the supply passage and the injection port are formed in the same number.

The injection port may be formed so as to communicate with an appropriate position of the supply path, for example, a terminal portion (deepest portion), but it is preferably formed in an upstream portion of the terminal portion (tip portion) of the supply path. That is, if the supply path is formed so as to extend toward the tip of the nozzle from the injection port, a space portion (or a recess) can be formed downstream of the intersection between the supply path and the injection port, and this space portion is formed as a turbulence generation unit. Can function as. Therefore, the fluid can be sprayed uniformly from the injection port.

The distance between the end of the supply path and the intersection (injection port entrance) (the length from the end of the supply path to the central axis of the injection port (depth from the injection port) D) is determined in each supply path. The supply paths having the same or different distances D may be arranged regularly or periodically in the circumferential direction, and may be arranged in an adjacent form or symmetrically with respect to the central axis of the nozzle body. You may. For example, the lengths of the plurality of supply paths may be the same or different, and the distance (or depth) D may be different in the circumferential direction regularly or periodically. The distance D is often substantially the same in each supply path.

The length L (L1 to L3) from the start end of the supply path to the intersection may be equal to or smaller than the length Ld from the intersection of the supply paths to the injection port, but the intersection of the supply paths. By making the length from the portion to the injection port larger than Ld, the fluid can be stably sprayed in the circumferential direction. The length L from the start end of the supply path to the intersection is, for example, 2 to 50 times, preferably 3 to 30 times, more preferably 3 to 30 times the length Ld from the intersection of the supply path to the injection port. May be about 5 to 20 times.

In a typical nozzle body, a plurality of supply paths extending in the axial direction of the rod body at intervals in the circumferential direction and having a closed end portion are formed on a solid rod body (rod-shaped body) such as a columnar body. , A slit-shaped injection port extending in the circumferential direction is formed on the peripheral wall of the rod body so as to communicate with the supply path. That is, on one end surface (for example, the outer peripheral region) of a solid rod such as a columnar body, a plurality of supply paths (for example, a plurality of supply paths having different lengths) extending in the axial direction at intervals in the circumferential direction are provided. An injection port can be formed by drilling and cutting (for example, cutting into a V shape) the peripheral wall corresponding to each supply path among the peripheral walls of the solid rod body.

The perforated nozzle (particularly, at least the nozzle body) of the present invention may be made of ceramic or plastic, but is usually made of metal in many cases.

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]
Nozzles shown in FIGS. 1 and 2 (number of injection ports (orifices): 6, number of supply paths (flow paths): 6, inner diameter of each supply path (flow path): 1 mm, L1 = 2.5 mm, L2 = 6. Pressure on water using 5 mm, L3 = 10.5 mm, Ld = 1.5 mm (distance from the outer circumference to the central axis of a supply path with a circular cross section (diameter 1 mmφ)), D = 1.0 mm, material: SUS303) The spray was applied at 0.3 MPa, and the flow rate at each injection port was measured. Table 1 shows the total flow rate (total flow rate at each injection port), the flow rate at each injection port, the variation in the flow rate at each injection port (the average value of the flow rate / flow rate at each injection port), and the standard deviation. The photograph which took the spraying state is shown. The nozzle was manufactured as an integrated nozzle by processing a single cylindrical body to form a nozzle body portion corresponding to the nozzle body 1 and an adapter portion corresponding to the adapter 5.

[Comparative Example 1]
The nozzle shown in FIG. 5, that is, one supply path (flow path) 32 having an inner diameter of 2 mm is formed along the central axis of the nozzle body 31, spaced in the circumferential direction (or opposed to each other), and axially. Nozzles similar to those in FIGS. 1 and 2 (number of injection ports: 6, number of supplies: 1, inner diameter of supply path: 2 mm, material: SUS303) were used except that injection ports 33a to 33c were formed in multiple stages at intervals. Except for the above, the flow rate at each injection port was measured in the same manner as in the examples. Table 1 shows the total flow rate (total flow rate at each injection port), the flow rate at each injection port, the variation in the flow rate at each injection port (the average value of the flow rate / flow rate at each injection port), and the standard deviation. Shows a photograph of the sprayed state.

As is clear from Tables 1, 6 and 7, when the nozzle of Example 1 is used, the variation in the flow rate at each injection port can be significantly reduced as compared with the nozzle of Comparative Example 1, and the variation with respect to the central axis of the nozzle can be significantly reduced. It was found that it can be sprayed uniformly in the circumferential direction.

Since the porous nozzle of the present invention can uniformly inject (or spray) a fluid in the circumferential direction with respect to the central axis of the nozzle body, it can be used for various purposes such as cooling spraying and treatment with a fluid, and is a fluid (treatment agent). , For example, it can be suitably used for spraying or applying a liquid (for example, an organic solvent such as water or alcohol, a rust preventive agent such as rust preventive wax, a coating agent, a paint, a cleaning liquid, a liquid such as an etching agent). .. In particular, a member having at least a curved or bent inner wall (or inner surface) and into which a nozzle can be inserted (or moved back and forth), for example, a hollow portion such as a hollow cylinder, a hollow polygon, a bag, or a box. Partially open members (for example, mechanical parts such as automobile parts) and members having a curved or bent cross section (for example, C-shaped cross section, ∪-shaped, U-shaped, doglegged) (for example, It can be applied to members with open side walls) and is suitable for treating at least curved or bent inner walls or inner surfaces of such members, especially for treating hollow inner walls.

Since the method of the present invention can uniformly spray even a small amount of fluid while suppressing liquid leakage, it is easy to form a coating film having a thin film thickness on the surface to be treated. It may be applied to applications (for example, application of rust preventive wax to automobile parts such as side sills and fenders).

The treatment agent (fluid) may be sprayed onto the inner wall (or inner surface) while the nozzle body is moved by the moving mechanism.

1 ... Nozzle body 2a to 2f ... Supply path 3a to 3f ... Injection port

Claims (10)

The tip of the nozzle body is closed; a plurality of injection ports formed on the peripheral wall of the nozzle body to inject fluid; and a flow path formed in the nozzle body to supply fluid to these injection ports. A perforated nozzle comprising the above, wherein the flow path is formed by a plurality of supply paths for supplying a fluid to the plurality of injection ports. The perforated nozzle according to claim 1, wherein a plurality of injection ports are formed on a columnar or conical peripheral wall of the nozzle body. The porous nozzle according to claim 1 or 2, wherein a plurality of injection ports are formed at least in the circumferential direction of the peripheral wall of the nozzle body. The porous nozzle according to any one of claims 1 to 3, wherein a plurality of injection ports are formed at periodic or regular intervals in the axial direction of the nozzle body as the plurality of injection ports move in the circumferential direction of the nozzle body. The perforated nozzle according to any one of claims 1 to 4, wherein an injection port is formed in an upstream portion of a terminal portion of a supply path. The injection port is formed in an elongated hole shape extending in the circumferential direction of the nozzle body, and of the elongated hole-shaped injection port, at least one inner wall of both inner walls facing each other in the nozzle axial direction bulges and curves in the nozzle axial direction. The porous nozzle according to any one of claims 1 to 5. The central axis of the supply path and the central axis of the injection port corresponding to the supply path intersect at an intersection, and the injection port is formed at an upstream portion of the end portion of the supply path. In each supply path, the length from the start end of the supply path to the intersection is larger than the length from the intersection of the supply paths to the injection port, and from the end of the supply path to the intersection. The porous nozzle according to any one of claims 1 to 6, wherein the length to reach is substantially the same in each supply path. A plurality of supply paths extending in the axial direction of the bar are formed on the solid rod at intervals in the circumferential direction, and a slit shape extending in the circumferential direction is formed on the peripheral wall of the rod so as to communicate with the supply path. The porous nozzle according to any one of claims 1 to 7, wherein an injection port is formed. A method of spraying a treatment agent as a fluid onto the inner wall of a member having at least a curved or bent inner wall, wherein the fluid is treated by using the porous nozzle according to any one of claims 1 to 8. A method of treating the inner wall by spraying on the inner wall. 9. The method of claim 9, wherein the member has a hollow inner wall and the hollow inner wall is treated.