JP2013158681A - Washing nozzle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a washing nozzle capable of enhancing a washing effect more without washing unevenness while preventing a fluid from flowing backward when washing an inner surface of a tubular member.SOLUTION: A washing nozzle includes a nozzle body 21 which has a supply path 211 for fluid inside, and a nozzle head 22 and a nozzle ring 23 externally fitted to the nozzle body in a freely detachable manner in order from a nozzle tip side, and has a jet slit 11 formed between the nozzle head and the nozzle ring in a nozzle circumferential direction so as to jet a fluid. The nozzle body is provided with a supply hole 212 for fluid communicating with the jet slit from a supply path at least at one place, the formation direction of the supply hole in a cross section perpendicular to a nozzle axis direction has an angle to a nozzle radius direction, and the opening diameter of the supply hole in a cross section perpendicular to the formation direction of the supply hole is larger in the nozzle axis direction than in a direction orthogonal to the nozzle axis direction.

Description

  The present invention relates to a cleaning nozzle (hereinafter, also simply referred to as “nozzle”), and more particularly to a cleaning nozzle used for cleaning the inner surface of a tubular member such as a hose.

  In general, a hydraulic hose used in a hydraulic device is used by cutting a hose manufactured in a long length with a length suitable for a use and crimping connection fittings at both ends. When cutting the hose, cutting chips adhere to the inner surface of the hose. If the hose is used in a hydraulic device with the cutting chips left untreated, it may cause a failure such as valve clogging. Therefore, it is necessary to clean the inner surface of the hose after cutting.

  However, if the hose has a long cutting length when cleaning the inner surface of the hose, the cutting waste will be pushed into the hose only by flowing the cleaning liquid from the cutting port, and the cleaning effect cannot be obtained. For this reason, in cleaning the inner surface of the hose, a nozzle provided on the side surface with an injection port inclined toward the hose opening side is inserted from the cutting port of the hose, and the cleaning liquid is injected from the inside of the hose to the opening side (reverse injection). The method is used. This technique is applicable not only to the hose but also to cleaning the inner surfaces of various tubular members.

  As a technique related to a nozzle used for cleaning the inner surface of a pipe, for example, in Patent Document 1, a hole in which a female screw is formed at the center of a mother body is penetrated, and a hose is inserted into this hole. A high-pressure cleaning nozzle is disclosed in which a plurality of nozzle holes are passed through a hose and a nipple from the outer periphery of the mother body by pressure-fixing to the mother body with a screw and a nipple covering the tip. Further, Patent Document 2 includes a base body provided with a joint portion connected to a pressure water supply hose, and a rotating body supported by a base body via a bearing. A chamber is formed so that the position of the center of gravity of the rotating body is decentered with respect to the rotation axis, and pressure water is jetted to the bottom of the rotating body in a direction that is perpendicular to the rotation axis and inclined to one side with respect to the radial direction. A culvert drain cleaning pipe cleaning nozzle is disclosed in which a plurality of holes are formed and pressure water is ejected from the holes so that the rotating body automatically rotates and vibrates.

Japanese Patent Laid-Open No. 10-230230 (Claims etc.) Japanese Patent Publication No. 1-30548 (claims)

  However, when using a nozzle with a conventional structure that has an injection port that is inclined toward the hose opening side on the side as the cleaning nozzle, foreign matter such as scraps are removed only at the portion where the cleaning liquid hits, so-called cleaning unevenness occurs. was there. Further, when the sprayed cleaning liquid collides with the inner wall of the tubular member, it rebounds not only toward the opening side of the tubular member but also toward the inner side, and the sprayed cleaning liquid flows backward in the inner direction of the tubular member, The foreign matter remains inside the tubular member, and a sufficient cleaning effect may not be obtained, thus reducing the cleaning effect.

  Here, as the formation direction of the injection port is closer to the right angle with respect to the nozzle axis direction, the cleaning liquid collides with the inner surface of the tubular member while the injection pressure is high, so that a high cleaning effect can be obtained. On the other hand, if the formation direction of the injection port is nearly perpendicular to the nozzle axis direction, the drainage resistance tends to cause a backflow of the cleaning liquid as described above, and the separated and removed foreign matter is in the direction opposite to the drainage direction. It will be washed away and the cleaning effect will decrease. Further, the flow of the cleaning liquid becomes non-uniform and uneven cleaning tends to occur. Therefore, only by adjusting the formation direction of the injection port, a sufficient cleaning effect cannot be obtained while preventing the occurrence of uneven cleaning.

  Accordingly, an object of the present invention is to solve the above-described problems and provide a cleaning nozzle that can improve the cleaning effect without occurrence of uneven cleaning while preventing back flow of fluid when cleaning the inner surface of the tubular member. There is.

  As a result of intensive studies, the present inventor has provided an ejection slit as an ejection port for ejecting fluid, and improved the formation direction and shape of a supply hole for supplying fluid from the inside of the nozzle to the ejection slit. As a result, the present invention has been completed.

That is, the cleaning nozzle of the present invention includes a nozzle body having a fluid supply path therein, and a nozzle head and a nozzle ring that are detachably fitted to the nozzle body sequentially from the nozzle tip side, A cleaning nozzle in which an injection slit is formed between the nozzle head and the nozzle ring and formed over the circumferential direction of the nozzle to inject fluid.
The nozzle body is provided with at least one fluid supply hole communicating from the supply path to the ejection slit, and the formation direction of the supply hole in a cross section perpendicular to the nozzle axis direction is the nozzle radius. The opening diameter of the supply hole in a cross section having an angle with respect to the direction and perpendicular to the formation direction of the supply hole is formed larger than the direction orthogonal to the nozzle axis direction in the nozzle axis direction. It is a feature.

  In this invention, it is preferable that the said supply hole is provided in the tangent direction of the surrounding surface of the said supply path. Moreover, in this invention, it is preferable that the said supply hole is provided in two or more places at equal intervals in the nozzle circumferential direction, especially 4-8 places.

  Furthermore, in this invention, the angle | corner which the formation direction of the said injection slit and the nozzle axis direction make in the cross section which passes along a nozzle axis is in the range of 20-70 degrees suitably. Furthermore, in the present invention, it is preferable that the shape of the peripheral surface forming the ejection slit in the nozzle head and the nozzle ring in a cross section passing through the nozzle axis has R at the bent portion.

  According to the present invention, with the above configuration, when cleaning the inner surface of the tubular member, it is possible to suppress the rebound of the fluid on the inner wall of the tubular member, prevent the back flow of the fluid, and enhance the cleaning effect. It became possible to realize a cleaning nozzle that can be used. By using the cleaning nozzle of the present invention, the tubular member, particularly the inner surface of the hose can be cleaned uniformly and sufficiently without causing uneven cleaning.

It is an axial direction one side sectional view showing an example of the washing nozzle of the present invention. It is an axial one side sectional view which decomposes | disassembles and shows the washing nozzle shown in FIG. (A) Sectional drawing which follows the AA line in FIG. 2, (b) The partial side view of the AA line vicinity in FIG. It is explanatory drawing which shows the state which a spiral jet generate | occur | produces from an injection slit. (A), (b) is an expanded partial sectional view which shows the injection slit vicinity of a washing nozzle. It is an axial direction one side sectional view showing other examples of the washing nozzle of the present invention. FIG. 7 is an axial one-side sectional view showing the cleaning nozzle shown in FIG. 6 in an exploded manner.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 shows an axial one-side sectional view showing an example of the cleaning nozzle of the present invention. FIG. 2 is an axial one-side sectional view showing the cleaning nozzle shown in FIG. 1 in an exploded manner. 3A is a cross-sectional view taken along the line AA in FIG. 2, and FIG. 3B is a partial side view of the vicinity of the line AA in FIG.

  The cleaning nozzle of the present invention shown in the figure is cylindrical, and has a nozzle body 21 having a fluid supply passage 211 therein, and a nozzle head 22 that is detachably fitted to the nozzle body 21 sequentially from the nozzle tip side. The nozzle ring 23 and the lock nut 24 are provided. The cleaning nozzle of the present invention shown in the figure has such a configuration, so that it can be easily assembled and can be easily manufactured.

  Further, in the illustrated cleaning nozzle of the present invention, an ejection slit 11 is formed between the nozzle head 22 and the nozzle ring 23 for ejecting fluid from the nozzle front end side toward the rear end side. Here, the jet slit in the present invention means a gap-like jet port formed over the circumferential direction of the nozzle.

  In the cleaning nozzle of the present invention, the nozzle body 21 is provided with at least one fluid supply hole 212 communicating from the supply path 211 to the ejection slit 11. As shown in FIG. 3A, the supply hole 212 is formed such that the formation direction of the supply hole 212 in a cross section perpendicular to the nozzle axial direction has an angle with respect to the nozzle radial direction. Further, as shown in FIG. 3B or the like, which is a side view seen from a direction parallel to the formation direction of the supply hole 212a in FIG. In the vertical cross section, the opening diameter Rx in the nozzle axis direction is formed larger than the opening diameter Ry in the direction orthogonal to the nozzle axis direction, that is, provided as a long hole extending along the nozzle axis direction. Yes.

  By providing the nozzle body 21 with the supply hole 212 extending in a direction (inclination direction) having an angle with respect to the nozzle radial direction, the fluid discharged from the supply hole 212 is a side hole extending in the nozzle axial direction of the supply hole 212. Interfering with the wall 212A, it has a velocity component in the circumferential direction of the nozzle, and a rotating flow is generated. When the rotational flow having the velocity component in the nozzle circumferential direction is ejected from the ejection slit 11, a velocity component corresponding to the formation direction of the ejection slit 11 is further given to the ejected fluid. As shown, the ejected fluid is spiral. In the drawing, Vx represents a velocity component in the nozzle axis direction due to the discharge pressure, Vy represents a velocity component in the nozzle circumferential direction generated by the supply hole 212, and V is a synthesized velocity component. As shown in the figure, when the spiral flow hits the inner surface of the tubular member 100 to be cleaned, the spiral flow flows along the inner surface of the tubular member 100, so that the drainage resistance is reduced and the backflow is suppressed. In addition, cleaning unevenness is also reduced.

  Further, in the cleaning nozzle of the present invention, cleaning is performed by ejecting fluid from the ejection slit 11 which is a gap-shaped ejection port formed in the circumferential direction of the nozzle, so that occurrence of uneven cleaning in the circumferential direction of the nozzle is also suppressed. . Here, since the supply hole 212 is not provided over the entire circumference, the fluid supplied from the nozzle body 21 has a non-uniform flow in the nozzle circumferential direction. However, in the cleaning nozzle of the present invention, the nozzle body 21 Since the non-uniformity is reduced by generating a rotating flow between the nozzle ring 23 and the nozzle ring 23, the influence on the cleaning unevenness in the nozzle circumferential direction can be reduced as a result.

  Furthermore, since the supply hole 212 according to the present invention is provided as a long hole along the nozzle axial direction, the flow rate of the fluid fed from the nozzle body 21 to the nozzle head 23 is efficiently increased by increasing the cross-sectional area of the hole. It can earn well, and this can reduce the pressure loss inside the nozzle.

  Here, as shown in FIG. 3A, the supply hole 212 is formed so that the radiation extending from the center of the nozzle always interferes with the side hole wall 212 </ b> A of the supply hole 212. As a result, the fluid discharged from the supply hole 212 always receives interference from the side surface wall 212 </ b> A of the supply hole 212, so that the rotational flow is reliably ensured in the space between the nozzle body 21 and the nozzle ring 23. Can be generated. From this point of view, particularly when the cleaning nozzle of the present invention is manufactured by cutting, it is necessary to design the wall thickness of the nozzle body 21 so as to satisfy the above conditions. If the nozzle body 21 is too thin, the fluid discharged from the supply hole 212 is hardly or hardly affected by the side hole wall 212A of the supply hole 212, and is thus applied to the discharged fluid. The velocity component in the nozzle circumferential direction is reduced or eliminated, and the discharged fluid does not have a sufficient rotational flow, so that the effects of the present invention cannot be sufficiently obtained. On the other hand, when the cleaning nozzle of the present invention is manufactured by injection molding, the shape of the nozzle body 21 in the vicinity of the side hole wall 212A on the outer diameter side of the supply hole 212 is improved so that a convex injection guide ( If not provided), the fluid can be interfered by the side hole wall 212A even if the wall thickness is small.

  The specific formation direction of the supply hole 212 is not particularly limited as long as it can generate a rotating flow as described above. In particular, from the viewpoint of workability when using a cutting process, the supply hole 212 is preferably provided in the tangential direction of the peripheral surface of the supply path 211 as shown in FIG.

  In the illustrated example, the supply holes 212 are provided in the nozzle body 21 at four locations at equal intervals in the nozzle circumferential direction. However, the present invention is not limited to this, and preferably, the supply holes 212 are equally spaced in the nozzle circumferential direction. And provided at two or more places, particularly 4 to 8 places. If the supply hole 212 is provided at only one location in the nozzle circumferential direction, the fluid flow uniformity in the nozzle circumferential direction may be impaired. It is more preferable that the supply holes 212 are disposed, and thereby, the variation in the discharge pressure from the ejection slit 11 can be further reduced.

  Furthermore, the arrangement position of the supply hole 212 in the nozzle axial direction is preferably on the nozzle ring 23 side of the ejection slit 11 as shown in the figure. If the position of the supply hole 212 is too close to the ejection slit 11 in the nozzle axis direction, the drainage resistance is reduced only in the vicinity of the portion where the supply hole 212 is disposed in the circumferential direction of the nozzle, so that a large amount of fluid is ejected vigorously only in this part. As a result, cleaning unevenness may occur. For this reason, in the present invention, providing the fluid reservoir 111 in the flow path between the supply hole 212 of the nozzle body 21 and the ejection slit 11 from the viewpoint of suppressing unevenness due to the pitch of the supply holes 212, preferable. By providing the reservoir 111 in the flow path from the nozzle body 21 to the ejection slit 11, the fluid flowing from the supply hole 212 of the nozzle body 21 once goes around the nozzle tip side before reaching the ejection slit 11. Become. As a result, the flow of the turbulent fluid flowing into the supply hole 212 from the supply path 211 can be adjusted and a laminar flow state can be obtained, so that the fluid injection unevenness is suppressed and the fluid is more evenly distributed in the circumferential direction of the nozzle. Can be injected. Here, the reservoir is a fluid reservoir provided on the nozzle tip side from the start position of the ejection slit 11 in the nozzle axis direction, and is formed with as large a capacity as possible in order to obtain the effect of adjusting the flow of the fluid. It is preferable.

  FIG. 5A shows an enlarged partial sectional view of the vicinity of the ejection slit of the cleaning nozzle of the present invention. As shown in the drawing, in the cleaning nozzle of the present invention, the shapes of the circumferential surfaces 22A and 23A forming the ejection slits 11 in the nozzle head 22 and the nozzle ring 23 in the cross section passing through the nozzle axis have R at the bent portion. It is preferable that As a result, as shown in FIG. 5B, when R is not provided, it is possible to reduce the occurrence of turbulent flow when the fluid turns back from the nozzle head 22 side to the nozzle ring 23 side. The decrease in the speed component in the rotating direction can be suppressed. In order to obtain the above effects, it is preferable to set the R shape of the circumferential surfaces 22A and 23A in the cross section in the nozzle axis direction as large as possible.

  In the cleaning nozzle of the present invention, the angle θ formed by the forming direction of the ejection slit 11 and the nozzle axis direction in a cross section passing through the nozzle axis is preferably in the range of 20 to 70 °. If this angle is too small or too large, a sufficient cleaning effect may not be obtained.

  In the present invention, the nozzle body 21 has a fluid supply path 211 therein, is connected to a cleaning hose (not shown), and is connected to the injection slit 11 via the supply path 211 and the supply hole 212. A fluid is supplied. The nozzle body 21 is formed so that the amount of cleaning liquid discharged can be finely adjusted by adjusting the screwing amount into the nozzle ring 23.

  The nozzle head 22 is a member having a nozzle tip portion and having a function of an insertion guide to the tubular member 100, and forms the injection slit 11 between the nozzle head 23. The amount of fluid discharged can be finely adjusted by the amount of gap between the nozzle head 22 and the nozzle ring 23, that is, the slit width. Further, the ejection angle from the ejection slit 11 can be appropriately set by the formation angle of the nozzle head 22 in the cross section passing through the nozzle axis of the circumferential surface 22A that forms the ejection slit 11.

  The nozzle ring 23 has a function of flowing the fluid supplied from the nozzle body 21 through the supply path 211 and the supply hole 212 to the ejection slit 11 which is a gap on the nozzle tip side. The nozzle ring 23 can be provided with an O-ring or a sealing agent can be applied to the screw portion to prevent the cleaning liquid from leaking from the supply side.

  The lock nut 24 is not essential in the present invention, and can be provided as necessary to prevent the screw from loosening after adjusting the discharge amount of the cleaning liquid and to fix the position of the nozzle ring 23.

  Although not shown, in the cleaning nozzle of the present invention, it is preferable to join the nozzle head to the nozzle body using a screw. Thereby, the joining strength of the nozzle head can be improved by increasing the screw size.

  The cleaning nozzle of the present invention is used for cleaning the inner surface near the opening end of a tubular member, and specific examples of the tubular member include hoses and pipe members used for various applications. Among them, it is particularly suitable for cleaning the inner surface of the hose. The cleaning nozzle of the present invention can be made of a metal material such as steel in accordance with a conventional method.

  In addition to the so-called reverse injection nozzle for injecting fluid from the inside of the tubular member to the opening side shown in FIG. 1 and the like, the cleaning nozzle of the present invention is as shown in the axial one-side sectional views of FIGS. The present invention can also be applied to a nozzle in a normal injection direction (a normal injection nozzle) that injects fluid from the opening side of the tubular member to the inside. Also in this case, it is possible to obtain a sufficient cleaning effect while preventing the fluid from flowing back on the inner wall of the tubular member and preventing the backflow of the fluid. It is possible to perform uniform and sufficient cleaning without any problems.

  Here, the cleaning nozzle shown in FIGS. 6 and 7 has a cylindrical shape, and has a nozzle body 41 having a fluid supply path 411 therein, and a nozzle body 41 that is detachably fitted in order from the nozzle tip side. A nozzle head 42, a nozzle ring 43, and a lock nut 44. Further, an injection slit 31 is formed between the nozzle head 42 and the nozzle ring 43 to inject fluid from the nozzle rear end side toward the tip end side. The nozzle main body 41 has an injection slit from the supply path 411. At least one fluid supply hole 412 communicating with 31 is provided. The conditions for forming the supply holes 412 are the same as those of the supply holes 212 in the cleaning nozzle shown in FIG. Also in this case, the shape of the circumferential surface 43A forming the injection slit 31 in the nozzle ring 43 in the cross section passing through the nozzle axis preferably has an R at the bent portion as shown in the figure.

  The procedure for cleaning the inner surface of a tubular member such as a hose using the cleaning nozzle of the present invention is as follows. First, with the cleaning nozzle of the present invention connected to the tip of the cleaning hose, the opening of the tubular member is opened. Insert from inside to inside. Thereafter, the inner surface of the tubular member is washed by pulling out the washing nozzle from the inside of the tubular member while pumping the fluid from the washing hose to the washing nozzle and ejecting the fluid from the ejection slit. In this case, the fluid transport pressure, the nozzle drawing speed, etc. can be appropriately determined according to conventional methods according to various conditions such as the dimensions of the hose to be cleaned, the slit width of each slit, etc. It is not limited. Further, as a fluid applicable to the cleaning nozzle of the present invention, air may be used in addition to a commonly used cleaning liquid such as water. In the case of using air, since the resistance at the time of jetting is smaller than that in the case of cleaning liquid, it is preferable to make the width of the jetting slit narrower than in the case of cleaning liquid.

11, 31 Injection slit 21, 41 Nozzle body 22, 42 Nozzle head 22A Nozzle head peripheral surface 23, 43 Nozzle ring 23A, 43A Nozzle ring peripheral surface 24, 44 Lock nut 100 Tubular member 111 Reservoir 211, 411 Supply path 212, 412 Supply hole 212A Side hole wall of supply hole

Claims (6)

A nozzle main body having a fluid supply path therein, and a nozzle head and a nozzle ring that are detachably fitted to the nozzle main body sequentially from the nozzle tip side, and between the nozzle head and the nozzle ring In addition, a cleaning nozzle that is formed over the circumferential direction of the nozzle and that ejects fluid and has an injection slit formed therein,
The nozzle body is provided with at least one fluid supply hole communicating from the supply path to the ejection slit, and the formation direction of the supply hole in a cross section perpendicular to the nozzle axis direction is the nozzle radius. The opening diameter of the supply hole in a cross section having an angle with respect to the direction and perpendicular to the formation direction of the supply hole is formed larger than the direction orthogonal to the nozzle axis direction in the nozzle axis direction. Characteristic cleaning nozzle.   The cleaning nozzle according to claim 1, wherein the supply hole is provided in a tangential direction of a peripheral surface of the supply path.   The cleaning nozzle according to claim 1 or 2, wherein the supply holes are provided at two or more locations at equal intervals in the nozzle circumferential direction.   The cleaning nozzle according to claim 3, wherein the supply holes are provided at 4 to 8 locations at equal intervals in the nozzle circumferential direction.   The cleaning nozzle according to any one of claims 1 to 4, wherein an angle formed by a forming direction of the ejection slit and a nozzle axis direction in a cross section passing through the nozzle axis is in a range of 20 to 70 °.   The cleaning nozzle according to any one of claims 1 to 5, wherein a shape in a cross section passing through a nozzle axis of a peripheral surface forming the ejection slit in the nozzle head and the nozzle ring has an R at a bent portion.

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