JP2011085221A - Hose joint - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hose joint having reduced cost by constructing a fluid draining passage without the need for hole forming work. <P>SOLUTION: The hose joint includes a cylindrical nipple N to be inserted into a hose H, a sleeve S having a plurality of circumferential hose retaining pieces 4 extending in the axial direction, and a nut B to be screw-joined and fastened to the nipple for pushing the hose retaining pieces 4 of the sleeve S against the hose side. In one of both of the outer periphery and inner periphery of a ring R incorporated inside the nut B, recessed portions 8-10 are formed extending in the axial direction to form the fluid draining passage. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a hose joint that is attached to the tip of a hose and connects the hose to another member or device.

A hose joint described in Patent Document 1 is conventionally known as this type. This conventional hose joint was developed in order to prevent the rupture of a double-structure hose in which a reinforcing material is mainly put in a mesh shape. Structurally, a connector is fitted into the joint bolt, and an O-ring is fitted between the joint bolt and the connector to keep the connection portion confidential. Then, fit the hose with the hose ring and the connector together, tighten the hose ring with the joint nut, hold the hose firmly with the connector and the hose ring, and connect the hose to the joint bolt. I have to.
The joint bolt having the tip of the hose connected as described above is connected to a predetermined device or the like, and the fluid supplied to the hose is guided to the device or the like.

  If the hose joint thus made is used for many years, the O-ring deteriorates. However, when the O-ring deteriorates, the sealing function of the O-ring deteriorates, and the fluid flowing through the hose may leak to the joint nut side. . Since the end face of the hose is exposed in the flow path process in which the fluid passes through the O-ring and leaks into the joint, the fluid enters between the layers of the double structure hose.

Also, when the joint nut is insufficiently tightened or the hose deteriorates due to continued use for many years and the elastic force is lost, the fluid enters between the layers of the double structure hose.
When the fluid enters between the layers of the hose in this way, there is no fluid escape path between the layers, so that the pressure between the layers increases steadily. Therefore, the hose may burst due to the action of the increased fluid pressure.

Therefore, in the conventional hose joint, a small hole is formed in the joint nut, and the fluid leaking into the joint nut is discharged to the outside from the small hole. Since the fluid in the joint nut is discharged from the small hole in this way, the fluid pressure in the joint nut becomes low, and it becomes difficult for the fluid to enter between the layers of the hose. Escapes from the small hole so that the hose does not rupture.
JP-A-8-285143

  In the conventional hose joint as described above, a hole is formed in the joint nut to form a small hole, but the burr generated by this hole processing hinders the connection of the hose, so it is necessary to remove it. Become. For this reason, there is a problem that the number of man-hours at the time of manufacture increases, and the cost increases accordingly.

  On the other hand, when the joint nut including the small holes is integrally formed of resin, the above hole processing is not necessary, and naturally, deburring is not necessary. However, in this case, for example, a core for forming a small hole must be provided in a mold for injection molding. When the core is provided in the mold as described above, when the resin is poured, the resin does not sufficiently spread to the side surface of the core that is downstream with respect to the flow direction of the resin, or a weld line is generated at the junction. . In this case, there was a problem that the strength of the portion could not be maintained, causing cracking, deformation or breakage.

  An object of the present invention is to provide a hose joint capable of forming a fluid drainage passage without requiring special drilling.

  According to a first aspect of the present invention, a cylindrical nipple inserted into a hose, a sleeve fitted to the outer periphery of the hose and provided with a plurality of hose holding pieces extending in the axial direction in the circumferential direction, and screw-connected to the nipple. In a hose joint equipped with a nut that presses the hose holding piece of the sleeve against the hose side when tightened, a recess extending in the axial direction is formed on either or both of the outer periphery and inner periphery of the ring incorporated inside the nut However, this recess has a feature in that it is a fluid drainage passage.

  According to a second aspect of the present invention, a cylindrical nipple inserted into the hose, a sleeve fitted to the outer periphery of the hose and provided with a plurality of hose pressing pieces extending in the axial direction in the circumferential direction, and screwed to the nipple. In a hose joint provided with a nut that presses the hose holding piece of the sleeve against the hose side when tightened, a recess extending in the axial direction is formed on the inner periphery of the nut, and this recess serves as a fluid drainage passage Have

  In both the first and second inventions, a concave portion that continues in the axial direction of the ring functions as a fluid drainage passage in a state where the nut is tightened and the sleeve is tightened, and the concave portion can be formed integrally with the nut or the ring. Therefore, no special drilling is required to form the fluid vent passage.

It is a disassembled perspective view of 1st Embodiment. It is an axial sectional view of the assembled state of the first embodiment. It is a perspective view of the ring of 1st Embodiment. It is sectional drawing of the ring of 1st Embodiment. It is an axial sectional view of the assembled state of the second embodiment. It is a perspective view of the ring of 2nd Embodiment. It is sectional drawing of the ring of 2nd Embodiment. It is an axial direction sectional view of the attachment state of a 3rd embodiment. It is a perspective view of the ring of 3rd Embodiment. It is sectional drawing of the ring of 3rd Embodiment. It is an axial direction sectional view of the attachment state of a 4th embodiment.

In the first embodiment shown in FIGS. 1 to 4, a hose H is connected to a nipple N provided on a joint body A. As members for connecting them, a sleeve S, a ring R and a nut B are used. I have.
The hose H has two layers, and reinforcing fibers f are provided between the layers.

  The joint body A has a bolt portion 1 for connecting the joint body A to a predetermined member or device, and a cylindrical shape to which the nut B is screwed on the opposite side to the bolt portion 1. The male screw part 2 is formed.

  Further, a nipple N is formed at the center portion of the cylinder of the male screw portion 2, but this nipple N has a sufficient axial length that protrudes from the cylindrical male screw portion 2 at its tip. ing. The nipple N has an outer diameter that is the same as or slightly larger than the inner diameter of the hose H, and when the nipple N is inserted into the hose H, the hose H and the nipple N fit together. In other words, the hose H and the nipple N can be inserted without forcibly pushing the nipple N into the hose H, and the dimensional relationship is maintained so that they can be easily inserted.

The sleeve S includes an annular portion 3 at the base end portion. The annular portion 3 has a hole 3a (see FIG. 2) through which the nipple N can be inserted smoothly and snugly at the center, and an annular convex portion 3b that slightly protrudes in the axial direction on the outer periphery. . The annular convex portion 3b maintains an outer diameter that fits snugly in the cylinder of the male screw portion 2, and the inner diameter is slightly larger than the outer diameter of the hose H.
In addition, if an axial slit is formed in one place of the annular part 3 and the annular part 3 is opened from the slit, the hose can be made with the diameter of the annular part 3 substantially increased. Since H can be inserted, it becomes easy to insert the hose H. Further, in order to improve the insertability of the hose H, a slit may be provided in the annular portion 3 of the sleeve S.

  Further, a plurality of hose pressing pieces 4 extending in the axial direction are formed in the circumferential direction on the annular convex portion 3b, and the hose pressing pieces 4 are separated from the annular portion 3 in the normal state shown in FIG. The shape is open in the outer diameter direction toward the tip. Then, if all the hose presser pieces 4 are considered as one, the cylinder gradually becomes larger in diameter toward the tip, and between the individual hose presser pieces 4 becomes larger toward the tip. The gap is formed.

  The hose presser pieces 4 configured as described above are contracted in the inner diameter direction to eliminate the gaps formed between the hose presser pieces 4 so that the adjacent hose presser pieces 4 are in close contact with each other. In combination, a tapered cylinder is formed.

Further, slopes 4a extending in the axial direction are formed at both corners of the outer surface of the hose presser piece 4, and these slopes 4a are formed when the adjacent hose presser pieces 4 are in close contact with each other as described above. The slant surface 4a of the adjacent hose pressing pieces 4 constitutes a fluid drainage passage. Therefore, in this embodiment, a fluid vent passage equal to the number of hose presser pieces 4 is formed.
In any case, since the slope 4a of this embodiment is integrated with the shape of the hose presser piece 4, the sleeve S can be formed integrally with the hose presser piece 4 by molding. In other words, the fluid vent passage can be formed without the need for special drilling as in the conventional case.

Further, a claw portion 4b protruding in the inner diameter direction is formed at the tip portion of the hose holding piece 4. When the entire hose presser piece 4 is contracted in the inner diameter direction, the claw portion 4b exerts a function of preventing the hose H from being pulled out of the sleeve S by biting into the hose H inserted into the sleeve S.
Further, in the portion where the pawl portion 4b bites into the hose H, the hose H is locally pressed against the nipple N, so that the sealing function is exhibited in this portion.

  The ring R is fitted to the outside of the sleeve S, and when the sleeve R is fitted to the sleeve S, a conical portion 5a whose diameter is gradually increased toward the sleeve S side is formed in an opening portion facing the sleeve S. Forming. The maximum diameter of the conical portion 5a is larger than the maximum outer diameter of a cylinder formed by a combination of all the hose pressing pieces 4 when the hose pressing piece 4 of the sleeve S is in a normal state. Therefore, if the conical portion 5a of the ring R is fitted from the tip side of the hose presser piece 4, all the hose presser pieces 4 are inevitably guided into the ring R while gradually reducing the diameter.

The inner diameter portion of the ring R continuing to the conical portion 5a is used as a tightening holding portion 5b, and the inner diameter of the tightening holding portion 5b allows the hose presser pieces 4 introduced therein to be in close contact with each other. The required dimensions are maintained. Therefore, when the hose presser piece 4 is introduced into the conical portion 5a as described above and the ring R is further pushed into the sleeve S, the adjacent hose presser pieces 4 are brought into close contact with each other.
Note that the inner diameter of the tightening holding portion 5b of the ring R is larger than the outer diameter of the hose H, and the gap 7 is maintained between them.

  As shown in FIGS. 3 and 4, a plurality of concave portions 8 extending in the axial direction are formed in the circumferential direction on the inner surface of the tightening holding portion 5b which is the inner periphery of the ring R as described above. The recessed portion 8 thus configured constitutes a fluid vent passage, and when the ring R is assembled as shown in FIG. 2, the inside of the nut B is opened to the outside.

  Further, the nut B is formed with a female screw portion 6a that is screw-coupled to the male screw portion 2 at one end opening portion, and an annular piece 6b that protrudes in the radial direction on the opposite side to the female screw portion 6a. Is forming. When the ring R is inserted into the nut B, the annular piece 6b maintains a size corresponding to the annular step 5c formed outside the ring R.

Next, the process of connecting the hose H to the joint body A and the configuration when connected will be described.
First, in a state where the ring R is inserted into the nut B, the hose H is passed through them. Then, the sleeve S in the normal state is fitted to the penetrating end of the hose H. By doing so, the opening of the hose H exactly matches the hole 3 a of the annular portion 3.

Next, the nipple N is inserted into the hose H through the nipple N from the hole 3a, and the sleeve S fitted to the hose H is inserted into the cylinder of the male screw portion 2.
Then, while maintaining the above state, the female screw portion 6a of the nut B is screwed to the male screw portion 2 and the nut B is gradually tightened. In the process of tightening the nut B in this way, the annular piece 6b pushes the annular step portion 5c of the ring R, so that the ring R is also forcibly moved in the tightening direction.

  If the ring R moves as described above, the hose presser piece 4 is introduced into the tightening holding portion 5b of the ring R accordingly, so that the cylinder constituted by all the hose presser pieces 4 is reduced in diameter. The pawl portion 4b bites into the hose H. As the pawl 4b bites into the hose H, the hose H can be prevented from coming off the sleeve S. In addition, the hose H is pressed strongly against the nipple N locally at the part where the pawl 4b bites into the hose H. Therefore, the sealing function is exhibited in this portion.

  In a state where the female screw portion 6a of the nut B is completely tightened to the male screw portion 2 of the nipple N, all the adjacent hose presser pieces 4 are in close contact with each other to form a cylinder, and the adjacent hose presser piece 4 The slopes 4a together form a recess that is a fluid escape passage.

Further, in a state where the female screw portion 6a of the nut B is completely fastened to the male screw portion 2 of the nipple N, the concave portion 8 functions as a fluid drainage passage.
In this state, for example, when the hose H deteriorates and the elastic force is lost, the sealing performance of the portion pressed by the pawl 4b is also inferior. In such a case, fluid easily leaks from between the hose H and the nipple N. If the fluid leaks, the fluid leaks into the cylinder that the hose presser piece 4 constitutes. However, if the amount of leakage increases, the pressure in the cylinder increases accordingly. However, since the space between the adjacent hose pressing pieces 4 or between the annular portion 3 of the sleeve S and the end surface of the nipple N is not specially sealed, the fluid is supplied from the gap between the hose pressing pieces 4. It leaks to the outside of the cylinder formed by

In this way, the fluid leaking from the cylinder is guided to the fluid drainage path formed by the recess 8 and is discharged to the outside of the nut B from the gap 7.
Furthermore, in this embodiment, since the fluid drainage passage is also constituted by the slope 4a of the hose presser piece 4, the fluid drainage passage formed by the concave portion 8 and the fluid drainage passage constituted by the slope 4a are combined, Although the leaked fluid is discharged to the outside of the nut B, the effect of discharging the fluid can be sufficiently exerted only by the fluid drain passage by the concave portion 8.

The gap formed between the adjacent hose presser pieces 4 or between the annular portion 3 of the sleeve S and the end face of the nipple N is formed by the members being in physical contact with each other. It is larger than the close gap between the layers of the hose H.
Therefore, when the pressure in the cylinder constituted by the hose presser piece 4 is increased, the fluid is guided to the fluid vent passage as described above without flowing between the layers of the hose H.

In any case, since the concave portion 8 constituting the fluid vent passage in the first embodiment is integrally formed with the ring R, it is not necessary to form a small hole as in the prior art.
Note that the nut B may be of a form in which it is turned by hand or a form of being turned using a tool such as a spanner.

  In the second embodiment shown in FIGS. 5 to 7, a concave portion 9 corresponding to the concave portion 8 of the first embodiment is formed on the outer periphery of the ring R, and other configurations including the assembled state of the joint are the first. This is the same as the embodiment.

That is, in the second embodiment, a plurality of recesses 9 extending in the axial direction are formed on the outer surface of the ring R in the circumferential direction, and these recesses 9 are extended to the surface of the annular step portion 5c. Yes. The recessed portion 9 thus configured constitutes a fluid vent passage, and when the ring R is assembled as shown in FIG. 5, the inside of the nut B is opened to the outside. Accordingly, the fluid leaking into the nut B is discharged to the outside of the nut B through the fluid drain passage.
Moreover, since the recessed part 9 of this 2nd Embodiment is integrally molded with the ring R, it is not necessary to form a small hole like the past.

  In the third embodiment shown in FIGS. 8 to 10, a recess 10 corresponding to the recess 8 of the first embodiment is formed on the inner peripheral surface of the opening portion on the opposite side to the conical portion 5a. The shape of the surface is different from that of the first embodiment, and other configurations are the same as those of the first embodiment including the assembled state of the joint.

The inner peripheral surface of the opening portion opposite to the conical portion 5a is a tapered surface 11 whose diameter is gradually increased outward in the axial direction, and the diameter of the outer end portion in the axial direction of the tapered surface 11 is a hose. It is larger than the outer diameter of H.
In addition, the concave portion 10 forming the fluid drainage passage is formed in the tapered surface 11, and a hook projecting in the inner diameter direction of the ring R is formed at the boundary portion between the axially inner end of the tapered surface 11 and the tightening holding portion 5b. Although the stop protrusion 12 is formed, the tip of the hose presser piece 4 of the sleeve S inserted into the nut B is hooked on the stop protrusion 12.

  The minimum diameter portion of the latching protrusion 12 is substantially the same as the outer diameter of the hose H. Therefore, when the hose H is inserted into the latching projection 12, the hose H is pushed in with force. However, since the tapered surface 11 is formed as described above, the hose H is the smallest diameter portion of the latching projection 12. Until you can guide smoothly.

In the third embodiment thus configured, when the ring R is assembled as shown in FIG. 8, the inside of the nut B is opened to the outside via the recess 10 which is the fluid drainage passage, and leaks into the nut B. The fluid is discharged to the outside of the nut B through the recess 10 which is a fluid drain passage.
Moreover, since the recessed part 10 of this 3rd Embodiment is integrally molded with the ring R, it is not necessary to form a small hole like the past.

  Furthermore, in the third embodiment, the latching protrusion 12 is formed in the ring R. Therefore, even if a force in the direction of coming off from the ring R acts on the hose H, the hose presser piece 4 of the sleeve S does not latch. It can be caught by the portion 12 and prevented from coming off. For example, if the hose H deteriorates and loses its elasticity, the hose holding piece 4 of the sleeve S may shrink in the direction of decreasing the diameter, and the hose H may come out of the nut B together with the sleeve S. In the embodiment, since the latching protrusion 12 is formed as described above, such a problem does not occur.

In the fourth embodiment shown in FIG. 11, the ring R used in the first to third embodiments is omitted, and a recess 13 that forms a fluid drainage passage is formed on the inner surface of the nut B. The configurations of N and the sleeve S are exactly the same as in the first embodiment.
And the said recessed part 13 is formed in the opening internal peripheral surface at the side which inserts the hose H so that it may be clear also from FIG.

The concave portion 13 thus configured constitutes a fluid vent passage, and when the nut B is assembled to the joint body A as shown in FIG. 11, the inside of the nut B is opened to the outside. Accordingly, the fluid leaking into the nut B is discharged to the outside of the nut B through the fluid drain passage.
Moreover, since the recessed part 13 of this 4th Embodiment is integrally molded with the nut B, it is not necessary to form a small hole like the past.

  In the first to fourth embodiments, the nut B may be of a form in which the nut B is turned by hand or a form of being turned using a tool such as a spanner.

H Hose N Nipple S Sleeve 4 Hose holding piece B Nut 8 Recessed portion constituting the fluid vent passage 9 Recessed portion constituting the fluid vent passage 10 Recessed portion constituting the fluid vent passage 13 Recessed portion constituting the fluid vent passage

Claims (2)

  A cylindrical nipple inserted into the hose, a sleeve fitted with the outer periphery of the hose and provided with a plurality of hose pressing pieces extending in the axial direction in the circumferential direction, and the sleeve when screwed to the nipple and tightened A hose joint having a nut that presses the hose holding piece toward the hose side, and a recess extending in the axial direction is formed on one or both of the outer periphery and the inner periphery of the ring incorporated inside the nut. A hose joint with a vent passage.   A cylindrical nipple inserted into the hose, a sleeve fitted with the outer periphery of the hose and provided with a plurality of hose pressing pieces extending in the axial direction in the circumferential direction, and the sleeve when screwed to the nipple and tightened A hose coupling comprising a nut for pressing the hose holding piece to the hose side, wherein a concave portion extending in the axial direction is formed on the inner periphery of the nut, and the concave portion serves as a fluid drainage passage.

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