JP5827105B2 - Cleaning nozzle and hose cleaning method - Google Patents

Description

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

  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. Therefore, a sufficient cleaning effect cannot be obtained only by adjusting the formation direction of the injection port.

  Therefore, an object of the present invention is to solve the above-mentioned problems and to clean the inner surface of the tubular member by spraying the cleaning liquid from the inside of the tubular member to the opening side, and without causing cleaning unevenness, the cleaning liquid is brought into the tubular member. It is an object of the present invention to provide a cleaning nozzle that can prevent backflow of the water and enhance the cleaning effect.

  As a result of intensive studies, the inventor has provided an injection slit and an injection hole having a specific twist angle with respect to the nozzle shaft as an injection port for injecting the cleaning liquid, and an injection direction of the cleaning liquid from the injection slit and the injection hole. It was found that the above problem can be solved by specifying the relationship, and the present invention has been completed.

That is, the cleaning nozzle of the present invention is formed in the circumferential direction of the nozzle sequentially from the nozzle tip side, and has a plurality of cleaning injection slits for jetting the cleaning liquid from the nozzle tip side to the rear end side, and a plurality of nozzles in the nozzle circumferential direction. A cleaning nozzle that is disposed and sprays the cleaning liquid from the front end side of the nozzle toward the rear end side, and a spray hole for promoting drainage of the cleaning liquid,
Nozzle axis direction in the injection slit formation direction as seen in a plane X passing through the injection hole center and the nozzle axis, wherein the injection hole formation direction a and the nozzle axis direction Z are in a twisted relationship. The angle θ ₁ formed with Z and the angle θ ₂ formed with the nozzle axis direction Z in the injection hole formation direction a satisfy the relationship represented by θ ₁ ≧ θ ₂ .

In the cleaning nozzle of the present invention, it is preferable that the angle θ _{1 of the} injection slit and the angle θ _{2 of the} injection hole are both in the range of 25 to 35 °. In addition, it is preferable that an angle θ ₃ formed by the injection hole forming direction a and the nozzle axis direction z seen in a plane Y that passes through the nozzle axis and is orthogonal to the plane X is in the range of 25 to 35 °. . Furthermore, it is preferable that the total area of the opening part of the injection slit is not more than twice the total area of the opening part of the injection hole.

  Furthermore, the cleaning nozzle of the present invention preferably has a cleaning liquid supply passage inside, and a nozzle main body connected to the cleaning hose, and the nozzle main body is detachably fitted in order from the nozzle tip side. A nozzle head, a nozzle ring and a lock nut, wherein the injection slit is formed between the nozzle head and the nozzle ring, the injection hole is formed in the nozzle ring, and the nozzle body It is assumed that the cleaning liquid is supplied to the injection slit and the injection hole through the supply path. The cleaning nozzle of the present invention can be suitably used for cleaning the inner surface of the hose.

  In addition, the hose cleaning method of the present invention is a method in which the cleaning nozzle of the present invention is connected to the tip of the cleaning hose and inserted into the inside from the opening of the hose, and then the cleaning liquid is supplied from the cleaning hose to the cleaning nozzle. The inner surface of the hose is cleaned by pulling out the cleaning nozzle from the inside of the hose while pumping and spraying the cleaning liquid from the injection slit and the injection hole.

  According to the present invention, with the above configuration, when cleaning the inner surface of the tubular member by spraying the cleaning liquid from the inside of the tubular member to the opening side, the splashing of the cleaning liquid on the inner wall of the tubular member is suppressed, It has become possible to realize a cleaning nozzle capable of preventing the cleaning liquid from flowing back into the tubular member and further enhancing the cleaning effect. 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 fragmentary sectional view showing an example of the washing nozzle of the present invention. It is explanatory drawing which shows the state which a spiral jet generate | occur | produces with the injection hole which concerns on this invention. It is explanatory drawing which shows the mechanism of this invention. It is the top view which looked at the washing nozzle shown in Drawing 1 from other directions. It is an axial direction fragmentary sectional view which shows one structural example of the washing nozzle of this invention. It is an axial direction fragmentary sectional view which shows the other example of the washing nozzle of this invention. It is an axial direction fragmentary sectional view which shows the other example of the washing nozzle of this invention. It is an axial direction expansion partial sectional view showing other examples of the washing nozzle of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a partial axial sectional view showing an example of the cleaning nozzle of the present invention. As shown in the figure, the cleaning nozzle of the present invention has a cylindrical shape, and includes an injection slit 11 and an injection hole 12 for injecting a cleaning liquid from the nozzle front end side toward the rear end side sequentially from the nozzle front end side. Here, the jet slit in the present invention means a gap-like jet port formed over the circumferential direction of the nozzle. The injection holes can be arranged at two or more locations at the same pitch in the nozzle circumferential direction, and the specific arrangement number can be appropriately set according to the diameter of the nozzle.

  In the present invention, the formation direction a of the injection hole 12 and the nozzle axial direction z have a twisted relationship, that is, the injection hole 12 is formed in a direction not included in any plane passing through the nozzle axial direction z. Has been. In this way, the injection hole 12 is formed at a predetermined angle in the direction twisted with respect to the axis of the nozzle, and the cleaning liquid is sprayed from the nozzle front end side to the rear end side, as shown in FIG. In addition, the cleaning liquid sprayed from the injection holes 12 hits the inner wall of the tubular member 100, and a spiral jet of the cleaning liquid is generated along the inner wall. Thereby, in addition to satisfying the condition of the injection angle described later, the cleaning liquid injected from the injection slit 11 rides on the preceding spiral flow and flows along the inner surface of the tubular member 100. As a result, the drainage resistance is reduced and backflow is less likely to occur. In addition, the cleaning width is increased, and the effect of preventing the occurrence of uneven cleaning can be obtained.

Further, in the present invention, as shown in the drawing, an angle θ ₁ formed with the nozzle axis direction z in the formation direction of the injection slit 11 as seen in a plane X passing through the outlet center of the injection hole 12 and the nozzle axis, and the injection It is important that the angle θ ₂ formed by the nozzle axis direction Z of the formation direction “a” of the hole 12 satisfies the relationship represented by θ ₁ ≧ θ ₂ . Here, the angle θ ₂ formed with the nozzle axis direction Z in the formation direction a of the injection hole 12 substantially corresponds to the cleaning liquid injection angle from the injection hole 12.

In this way, the injection angle of the injection slit 11 on the nozzle front end side is the same as or larger than the injection angle of the injection hole 12 on the nozzle rear end side, that is, an angle close to a right angle with respect to the nozzle axial direction. By setting, the mechanism for preventing the backflow of the cleaning liquid into the tubular member is as follows. As shown in FIG. 3, the cleaning liquid L2 is sprayed from the nozzle 12 on the nozzle rear end side by reducing the spray angle, so that the air between the spray slit 11 and the spray hole 12 is caused by the flow of the cleaning liquid L2. The tubular member 100 can be pulled toward the opening side. Thus, even if the cleaning liquid L1 is sprayed from the spray slit 11 with a certain degree of spray angle, the cleaning liquid L1 flows toward the opening side of the tubular member 100 without causing a backflow due to the flow of the atmosphere. Conceivable. Accordingly, the cleaning liquid ejected from the ejection slit 11 flows along the inner surface of the tubular member 100 along the flow of the spiral cleaning liquid ejected from the ejection hole 12, and the ejection of the cleaning liquid L1 ejected from the ejection slit 11 While increasing the angle to ensure a high cleaning effect, it is possible to prevent the backflow of the cleaning liquid L1 and improve the cleaning power. That is, in the cleaning nozzle of the present invention, the injection slit 11 functions mainly for cleaning, and the injection hole 12 functions for promoting the drainage of the cleaning liquid. In the present invention, to those in which the injection angle theta ₂ of the injection angle theta ₁ and the injection hole 12 of the injection slit 11 satisfies the relationship represented by θ ₁ ≧ θ ₂ is injected from the injection hole 12 It also means that the cleaning liquid is prevented from interfering with the cleaning liquid ejected from the ejection slit 11 before hitting the inner wall of the tubular member.

In the present invention, the angle θ ₁ of the injection slit 11 and the angle θ ₂ of the injection hole 12 can be specifically set in a range of 20 ° to 70 °, for example. Particularly, in the present invention, it is preferred that the angle theta ₂ of the angle theta ₁ and the injection hole 12 of the injection slit 11 is in the range of either 25 to 35 °. If the angle of the ejection slit 11 is made too large, it is necessary to increase the flow rate of the cleaning liquid ejected from the ejection hole 12, and for that purpose, the ejection angle of the ejection hole 12 needs to be made more acute. However, the smaller the injection angle, the higher the pressure loss of the cleaning liquid, and the longer the total length of the nozzle becomes, which is not preferable. From this viewpoint, the angle theta ₂ of the angle theta ₁ and the injection hole 12 of the injection slit 11 is preferably both is within the above range around 30 °. Also, assuming that the injection speed from the injection slit 11 is Vs and the injection speed from the injection hole 12 is Vh, in order to prevent drainage resistance from being applied to the injection from the injection slit 11, the axial speed of the tubular member 100 When the components are compared, it is desirable that (speed component from the injection slit 11) <(speed component from the injection hole 12). This is expressed by the following formula.
Vs · cos θ ₁ <Vh · cos θ ₂ · cos θ ₃

In the present invention, as shown in FIG. 4, the angle θ ₃ formed by the formation direction “a” of the injection hole 12 and the nozzle axis direction z as viewed in the plane Y that passes through the nozzle axis and is orthogonal to the plane X is the injection This corresponds to the twist angle of the hole 12. The twist angle θ ₃ may be greater than 0 ° and less than 90 °, and is particularly preferably in the range of 25 to 35 °. When the twist angle theta ₃ too large, the injection nozzle axis velocity component of the injected cleaning liquid from the hole 12 is reduced, this velocity component becomes too smaller than the injection slit 11, and the drainage resistance increases The twist angle θ ₃ is preferably within the above range of about 30 ° because it is easy to flow backward.

  Furthermore, in the present invention, it is preferable that the total area of the opening of the injection slit 11 is not more than twice the total area of the opening of the injection hole 12. If the flow rate of the cleaning liquid ejected from the ejection hole 12 becomes too smaller than the flow rate of the cleaning liquid ejected from the ejection slit 11, the speed component in the nozzle axis direction of the cleaning liquid ejected from the ejection hole 12 becomes smaller. If it becomes too smaller than the injection slit 11, drainage resistance will become large and it will become easy to flow backward. For this reason, it is preferable that the total area of the opening of the injection slit 11 is not more than twice the total area of the opening of the injection hole 12, and is at least larger than the total area of the opening of the injection hole 12.

  Furthermore, in the present invention, the smaller the distance between the ejection slit 11 and the ejection hole 12, the better. This is because as the distance between the ejection slit 11 and the ejection hole 12 is smaller, the negative pressure generated by the ejection of the cleaning liquid from the ejection hole 12 can be used more effectively. The dimensions of the cleaning nozzle of the present invention can be appropriately set and determined depending on the inner diameter of the tubular member to be cleaned, the length of the inner portion to be cleaned, and the like, and are not particularly limited.

  Specifically, as shown in FIG. 5, the cleaning nozzle of the present invention includes a nozzle body 21, a nozzle head 22, a nozzle ring 23, and a nozzle body 22 that are detachably fitted to the nozzle body 21 sequentially from the nozzle tip side. And a lock nut 24. By adopting such a configuration for the cleaning nozzle, it is easy to assemble and can be easily manufactured.

  The nozzle body 21 has a cleaning liquid supply path 211 therein, is connected to a cleaning hose (not shown), and supplies the cleaning liquid to the injection slit 11 and the injection hole 12 through the supply path 211. In the illustrated example, the cleaning liquid is supplied to the injection slit 11 and the injection hole 12 through the hole 212 provided on the side surface of the nozzle body 21 and communicating with the supply path 211. In order to discharge the cleaning liquid uniformly over the entire circumference of the nozzle, it is preferable to provide a plurality of holes 212 as many as possible at a uniform pitch. At this time, as shown in FIGS. 6 and 7, one of the two hole portions 212 is formed as a long hole-shaped hole portion 212 </ b> A along the nozzle longitudinal direction, and the nozzle body 21 </ b> A and the two hole portions 212 are connected to each other. It is preferable to use the nozzle body 21B having the long hole shape 212B because the flow rate of the cleaning liquid can be increased efficiently. Further, 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 discharge amount of the cleaning liquid L1 can be finely adjusted by the amount of gap between the nozzle head 22 and the nozzle ring 23, that is, the slit width.

  The nozzle ring 23 has a function of flowing the cleaning liquid supplied from the nozzle body 21 through the supply path 211 to the injection slit 11 and the injection hole 12 that are gaps on the nozzle tip side. The nozzle ring 23 is provided with a plurality of injection holes 12 at a uniform pitch in the nozzle circumferential direction. By providing the nozzle ring 23 with an O-ring, leakage of the cleaning liquid from the supply side can be prevented. The lock nut 24 has a function of preventing the screw from loosening after adjusting the discharge amount of the cleaning liquid and fixing the position of the nozzle ring 23.

  In the present invention, as shown in FIG. 1, a cleaning liquid reservoir 111 is provided in a flow path between the hole 212 communicating with the supply path 211 of the nozzle body 21 and the injection slit 11 and the injection hole 12. preferable. By providing the reservoir 111 in the flow path from the nozzle body 21 to the injection slit 11 and the injection hole 12, the cleaning liquid flowing from the hole 212 of the nozzle body 21 reaches the injection slit 11 and the injection hole 12. Once around the nozzle tip side. As a result, the flow of the turbulent cleaning liquid flowing into the hole 212 from the supply path 211 can be adjusted and a laminar flow state can be obtained, so that uneven cleaning of the cleaning liquid is suppressed and the cleaning liquid is more evenly distributed in the circumferential direction of the nozzle. Can be injected. Here, the reservoir is a cleaning liquid reservoir provided on the nozzle tip side from the start positions of the injection slit 11 and the injection hole 12 in the nozzle axis direction, and is as large as possible in order to obtain the effect of adjusting the flow of the cleaning liquid. It is preferable to form the capacitor. 8, in addition to the inner wall 221 of the nozzle head that forms the reservoir 111, the inner wall 231 of the nozzle ring preferably has an inner angle R in the cross section. Thereby, the reduction | decrease of the rotation direction component which generate | occur | produced inside the nozzle can be suppressed by relieving generation | occurrence | production of the turbulent flow at the time of cleaning liquid returning from the nozzle front end side to the rear end side. The inner angle R is preferably set as large as possible.

  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 the present invention, as a procedure for cleaning the hose, first, the cleaning nozzle of the present invention is inserted into the inside of the opening of the hose while being connected to the tip of the cleaning hose. Thereafter, the inner surface of the hose is cleaned by pulling the cleaning nozzle out of the hose while pumping the cleaning liquid from the cleaning hose to the cleaning nozzle and spraying the cleaning liquid from the injection slit and the injection hole. In this case, the cleaning liquid transport pressure, the nozzle pulling 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. Moreover, water can be normally used as the cleaning liquid.

DESCRIPTION OF SYMBOLS 11 Injection slit 12 Injection hole 21,21A, 21B Nozzle main body 22 Nozzle head 23 Nozzle ring 24 Lock nut 100 Tubular member 111 Reservoir part 211 Supply path 212,212A, 212B Hole part 221 Nozzle head inner wall 231 Nozzle ring inner wall L1, L2 cleaning solution

Claims (7)

Sequentially from the nozzle tip side, formed in the circumferential direction of the nozzle and sprayed with cleaning liquid from the nozzle tip side to the rear end side, and a plurality of cleaning slits arranged in the nozzle circumferential direction, from the nozzle tip side to the rear end A cleaning nozzle for spraying a cleaning liquid toward the side, and a spray hole for promoting drainage of the cleaning liquid ,
Nozzle axis direction in the injection slit formation direction as seen in a plane X passing through the injection hole center and the nozzle axis, wherein the injection hole formation direction a and the nozzle axis direction Z are in a twisted relationship. Z and angle theta _1, cleaning nozzle wherein the nozzle axis Z and the angle theta ₂ of the forming direction a of the injection holes, and satisfies a relation represented by θ ₁ ≧ θ _2. The cleaning nozzle according to claim 1, wherein both the angle θ _{1 of the} ejection slit and the angle θ _{2 of the} ejection hole are in the range of 25 to 35 °. The angle θ ₃ formed by the injection hole forming direction a and the nozzle axis direction Z , as viewed in a plane Y passing through the nozzle axis and orthogonal to the plane X, is in the range of 25 to 35 °. The cleaning nozzle described.   The cleaning nozzle according to any one of claims 1 to 3, wherein a total area of the opening of the injection slit is not more than twice a total area of the opening of the injection hole.   A nozzle body that has a cleaning liquid supply path and is connected to a cleaning hose, and a nozzle head, nozzle ring, and lock nut that are detachably fitted to the nozzle body sequentially from the nozzle tip side. The injection slit is formed between the nozzle head and the nozzle ring, the injection hole is formed in the nozzle ring, and the injection slit and the injection hole are formed through the supply path of the nozzle body. The cleaning nozzle according to claim 1, wherein a cleaning liquid is supplied.   The cleaning nozzle according to any one of claims 1 to 5, which is used for cleaning an inner surface of a hose.   After the cleaning nozzle according to claim 6 is connected to the tip of the cleaning hose, the cleaning nozzle is inserted into the cleaning nozzle from the opening of the hose, and then the cleaning liquid is pumped from the cleaning hose to the cleaning nozzle through the injection slit and the injection hole. A method for cleaning a hose, wherein the inner surface of the hose is cleaned by pulling the cleaning nozzle out of the hose while spraying a cleaning liquid.

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