JP4620411B2 - Piping connection fitting - Google Patents

Description

  The present invention relates to a connection joint for piping, and more particularly to a device having a feature in a means for preventing foreign matter from getting into a seal member.

In recent years, for example, resin pipes made of a hard resin material have been used as pipes for water supply and hot water supply.
In this case, it is possible to easily cut and connect long resin pipes according to the situation at the construction site, configure the pipe with an appropriate length according to the situation at the construction site, and perform pipe connection work. It can be done easily.

FIG. 6 (a) schematically shows an example of a connection joint for piping used at that time.
In the figure, reference numeral 200 denotes a pipe connection joint, which is a cylindrical insertion space 202, an inner cylinder 206 as a male fitting portion fitted into the inner peripheral surface of the resin pipe 204 inserted therein, and an inner cylinder. An O-ring (seal member) 208 and an outer cylinder 210 are provided on the outer peripheral surface of 206.

  When the resin pipe 204 is inserted and connected to the connection joint 200 at the construction site, the site builder chamfers the inner surface of the distal end of the pipe 204 so that the O-ring 208 is not damaged by the pipe 204. At that time, as shown in (b), the shaving 212A remains on the inner surface of the pipe 204 in a partially connected state, or the shaving 212A that has been cut off adheres to the inner surface of the pipe 204. May remain.

  In this case, when the pipe 204 is inserted into the connection joint 200 and connected, the shaving 212A that is partially connected enters the position of the O-ring 208 together with the pipe 204, or the shaving 212A that has been cut off. Alternatively, while other foreign matters are attached to the inner peripheral surface of the pipe 204, the friction force between the pipe 204 and the inner peripheral surface of the pipe 204 intrudes into the position of the O-ring 208 together with the pipe 204. Bites into the O-ring 208, causing a problem of water leakage.

  The above is an example in which the male fitting portion is fitted into the inner peripheral surface of the pipe 204 and sealing is performed with an elastic seal member attached to the outer peripheral surface of the male fitting portion. A similar problem is inherent in a connection joint of a type in which the outer peripheral surface of the pipe 204 is fitted to the outer peripheral surface of the pipe 204 and sealed with a seal member attached to the inner peripheral surface of the female fitting portion.

  The above is an example of the resin pipe 204, but the same problem may occur when connecting other metal pipes 204 to the connection joint.

  The one-touch joint that solves the problem that the sealing performance is hindered by dirt and dust adhering to the inner peripheral surface of the pipe is disclosed in the following Patent Document 1, but this is an annular packing made of rubber or the like. The foreign matter removing means is configured, and such a device cannot solve the problem of deterioration in sealing performance due to shaving that remains partially connected by the chamfering process.

JP 2002-310364 A

  The present invention is based on the circumstances as described above, in the case where shavings or other foreign matters are attached to the inner peripheral surface or outer peripheral surface of the pipe, that is, the fitting surface with the connection joint. Even in such a case, the purpose of the present invention is to provide a pipe joint that can surely prevent the problem that the shavings and foreign matters penetrate into the position of the seal member and bite into the seal member when the pipe is inserted. Is.

Thus, according to the first aspect of the present invention, there is provided an insertion space of a pipe, a male fitting part fitted into the inner peripheral surface of the inserted pipe, or a female fitting part fitted outside the outer peripheral surface, and the male fitting. In connection joints of pipes, which are attached to the outer peripheral surface of the part or the inner peripheral surface of the female fitting part and provided with an annular seal member that elastically contacts with the pipe to form a seal, it becomes a fitting surface for the pipe A substantially axis-perpendicular direction in a direction facing the distal end surface of the pipe to be inserted into a portion closer to the distal end side on the pipe insertion side than the seal member on the outer peripheral surface of the male fitting portion or the inner peripheral surface of the female fitting portion. A metal stepped edge portion having a rising surface is provided in an annular shape, and an annular recess is further provided on the distal end side of the edge portion, following the edge portion.

Effects and effects of the invention

  As described above, the present invention provides a metal stepped edge portion on the outer peripheral surface of the male fitting portion or the inner peripheral surface of the female fitting portion which is a fitting surface for the pipe of the connection joint. In addition to being provided with an annular shape, an annular recess is further provided on the distal end side. According to the present invention, when a pipe is inserted into a connection joint for connection, it is provided on the fitting surface side of the pipe. Even if the shavings generated by chamfering remain partially connected or attached in a disconnected state, or if other foreign matter is attached, piping was inserted into the connection joint At this time, the foreign matter is removed by a shearing (cutting) action or a scraping action by a metal stepped edge provided on the male fitting part or the female fitting part, and is accommodated in the annular recess.

  Accordingly, it is possible to reliably prevent such foreign matter from entering the seal member when the pipe is inserted and biting into the seal member, and to ensure good sealing performance.

The present invention der Ru particularly suitably applied particularly to the connection joint of the resin pipe.

Next, embodiments of the present invention will be described in detail with reference to the drawings.
1 to 3, reference numeral 10 denotes a metal connection joint, which has a joint body 12. The joint body 12 has a male threaded portion 14 on one end side (right end side in the figure), and has a tool engaging portion 16 at a position close to the male threaded portion 14.

  The connection joint 10 has a cylindrical insertion space 17 into which a pipe (here, a resin pipe) 18 is inserted in the axial direction.

Reference numeral 20 denotes an inner cylinder as a male fitting portion that fits inside the inner peripheral surface of the pipe 18, and is configured integrally with the joint body 12.
An O-ring groove is formed on the outer peripheral surface of the inner cylinder 20, and a rubber O-ring (annular seal member) 22 is attached thereto.
The O-ring 22 elastically contacts the inner peripheral surface of the pipe 18 and performs a sealing action.

  Reference numeral 24 denotes a cylindrical body that is a separate body from the joint body 12, and is screwed to the male thread portion 28 of the joint body 12 at the female thread portion 26. A through-hole opening 30 is formed in the cylindrical body 24.

A cap nut 32 is screwed to a male screw portion 36 of the cylindrical body 24 at a female screw portion 34.
Reference numeral 38 denotes a lock ring which is held in the axial direction by the cap nut 32 and the cylindrical body 24, and has a number of claws 40 along the circumferential direction as shown in FIGS. Yes.

  The lock ring 38 prevents the pipe 18 from being removed from the connection joint 10 by causing the claw 40 to bite into the outer peripheral surface of the pipe 18 inserted into the insertion space 17.

Reference numeral 42 denotes a release ring for releasing the lock by the lock ring 38. The release ring 42 is pushed rightward in FIG. 1 to push the claw 40 of the lock ring 38 rightward in the figure, so that the claw 40 against the outer peripheral surface of the pipe 18 is shown. Cancel the bite. That is, the lock of the lock ring 38 with respect to the pipe 18 is released.
Here, the release ring 42 is retained by the cap nut 32.
In the present embodiment, the outer cylinder 50 is constituted by the cylinder 24 and the cap nut 32.

  The outer peripheral surface of the inner cylinder 20 is a fitting surface with respect to the inner peripheral surface of the pipe 18, and this outer peripheral surface is stepped on the tip side portion on the left side in the drawing, that is, on the tip side portion on the insertion side of the pipe 18. A ring-shaped edge portion 44 having a ring shape is provided, and an annular recess 46 is further formed on the distal end side of the annular edge portion 44 following the edge portion 44.

In the partially enlarged view of FIG. 1, reference numeral 48 denotes a rising surface of the edge portion 44, which is a rising surface in the direction perpendicular to the axis.
In the present embodiment, it is desirable that the rising angle of the rising surface 48 (angle with respect to the direction perpendicular to the axis) is 90 ± 5 °.

In this connection joint 10, the connection can be made with one touch only by inserting the pipe 18 into the insertion space 17.
When the pipe 18 is inserted into the insertion space 17, the outer peripheral surface of the inner cylinder 20 as a male fitting portion is fitted into the inner peripheral surface of the pipe 18, and the O-ring 22 attached to the outer peripheral surface of the inner cylinder 20 is connected to the pipe 18. The inner peripheral surface of the pipe 18 is elastically contacted to form a seal, and the claw 40 of the lock ring 38 bites into the outer peripheral surface of the pipe 18 to prevent it from coming off.

FIG. 4 schematically shows the operation of the connection joint 10.
When the resin pipe 18 is connected to the connection joint 10 of the present embodiment at the construction site, the end of the inner peripheral surface serving as the seal surface is chamfered.

In this case, the shavings 52A may remain partially connected. In this case, the shavings 52A are sheared by the edge portion 44 when the pipe 18 is inserted into the connection joint 10 as shown in (II). It is separated from the pipe 18 by the action.
Then, the separated shavings 52A are accommodated in an annular recess 46 formed following the edge portion 44 as shown in (III), and when the pipe 18 is subsequently inserted into the insertion space 17, this is applied. It is reliably prevented that the shavings 52 </ b> A enters the O-ring 22 together with the pipe 18 and bites into the O-ring 22.

The above is the case where the shavings 52A generated during the chamfering process remains partly connected to the pipe 18, but when the shavings 52A are separated from the pipe 18 and adhere to the inner surface thereof. Even when the pipe 18 is inserted, the edge portion 44 scrapes and removes the shavings 52 </ b> A from the inner peripheral surface of the pipe 18 and accommodates it in the recess 46.
Therefore, it is possible to reliably prevent the shavings or other foreign matter adhering to the inner surface of the pipe 18 from entering the O-ring 22 by the insertion of the pipe 18 and biting into it.

  As described above, according to the present embodiment, when the pipe 18 is inserted into the connection joint 10 and connected, the foreign matter attached to the pipe 18 is satisfactorily piped by the shearing action or scraping action of the edge portion 44. 18 can be removed and accommodated in the recess 46.

  Therefore, it is possible to reliably prevent such foreign matter from entering the position of the seal member 22 when the pipe 18 is inserted and biting into the seal member 22, thereby ensuring good sealing performance.

The above is an example in which the male fitting portion of the connection joint 10 is fitted on the inner peripheral surface of the pipe 18 and a seal is formed between them. The present invention can also be applied to a case in which the outer peripheral surface of 18 is fitted and a seal is formed between them.
FIG. 5 schematically shows an example thereof.

  In the connection joint 10 shown in FIG. 5, the outer cylinder 50 is configured as a female fitting portion, and an annular edge portion 44 having a stepped shape is further provided on the inner peripheral surface serving as a fitting surface with respect to the outer peripheral surface of the pipe 18. Following this, an annular recess 46 is formed.

  When the resin pipe 18 is connected to the connection joint 10, the end of the outer peripheral surface serving as the fitting surface is chamfered. At this time, the shaving 58A is partially connected to the outer peripheral surface. Alternatively, even when the pipe 18 is separated from the pipe 18 and remains attached to the outer peripheral surface, when the pipe 18 is inserted into the insertion space 17 of the connection joint 10, the shaving 58 </ b> A that is partially connected or attached is provided. Further, other foreign matters are removed from the pipe 18 by the shearing action or scraping action by the edge portion 44 and are accommodated in the recess 46.

  Therefore, also in the connection joint 10 of this embodiment, it is possible to solve the problem that the shavings 58A and other foreign matters are caught in the O-ring 22 to inhibit the sealing performance and cause water leakage.

  Although the embodiment of the present invention has been described in detail above, this is merely an example, and the present invention does not depart from the gist of the present invention, such as being applicable to a connection joint for piping made of a material other than resin. It can be configured in various forms with various changes in the range.

It is sectional drawing which shows the connection joint of piping of one Embodiment of this invention. It is sectional drawing which decomposes | disassembles and shows the connection coupling of the embodiment. It is a perspective view which decomposes | disassembles and shows the connection coupling of the embodiment. It is operation | movement explanatory drawing of the embodiment. It is the figure which showed typically the connection coupling of other embodiment of this invention. It is the figure which showed typically an example of the connection joint of the conventional piping.

10 Connection Joint 17 Insertion Space 18 Piping 22 O-Ring (Seal Member)
44 Edge 46 Recess

Claims (1)

An insertion space of the pipe, a male fitting part fitted into the inner peripheral surface of the inserted pipe or a female fitting part fitted outside to the outer peripheral face, and an outer peripheral face or female fitting part of the male fitting part In a connection joint of a pipe provided with an annular seal member that is attached to the inner peripheral surface and elastically contacts with the pipe to form a seal, the outer peripheral surface or female fitting of the male fitting portion that becomes a fitting surface for the pipe A metal stepped shape having a rising surface in a direction substantially perpendicular to the axis in a direction opposite to the distal end surface of the pipe to be inserted at a portion closer to the distal end side of the pipe inserted than the seal member of the inner peripheral surface of the joint portion The pipe joint is characterized in that the edge portion is provided in an annular shape, and an annular recess is provided on the further tip side of the edge portion, following the edge portion.

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