JP6922342B2 - Pipe fitting - Google Patents

Description

The present invention relates to pipe fittings.

Generally, for gas supply pipes such as city gas, flexible pipes provided with bellows-shaped metal corrugated pipes and pipe joints coupled to the flexible pipes are widely used from the viewpoint of workability and the like. In a conventional pipe joint, for example, as shown in Patent Document 1, a joint body having an inner hole into which a flexible pipe is inserted and a retainer provided in the inner hole are slidably engaged with the inner hole. It is provided with a retainer retainer that locks a claw provided on the retainer to a valley portion of a metal corrugated pipe by pressing the retainer at a specific slide position.

The pipe joint shown in Patent Document 1 describes a configuration in which a retainer retainer is provided with a communication hole for communicating the inside and the outside, and a selective permeability member for selectively transmitting a gas is attached to the communication hole. If a nail is accidentally driven into a metal corrugated pipe during piping construction after connecting the flexible pipe to the pipe joint, the gas leaked from the hole formed by the nail permeates the selective permeable member and escapes from the communication hole. .. By detecting the escaped gas with a gas sensor or the like, it is possible to detect a poorly perforated metal corrugated pipe. The selective transmissive member is only mounted by pushing it into the communication hole, and may come out of the communication hole. In order to prevent this, the pipe joint shown in Patent Document 1 has a structure in which the opening of the communication hole to which the selective transparent member is mounted is covered around the end portion of the joint body.

Japanese Unexamined Patent Publication No. 2004-316733

In the pipe joint described in the background technique, it is possible to quickly detect a poor opening of a metal corrugated pipe by bringing the gas sensor closer to the opening of the communication hole equipped with the selective permeability member. However, in the pipe joint described in the background technique, since the selective permeable member is covered with the joint body, it is not possible to know the position of the selective permeable member around the outer periphery of the joint body. It was difficult to bring the gas sensor close to the opening of the communication hole. Therefore, there is a possibility that it takes a long time to detect the defective perforation of the metal corrugated pipe. It should be noted that such a problem is not limited to the pipe joint in which the selective permeable member is attached to the communication hole communicating the inside and the outside as described above, and the configuration is such that the selective permeable member is not arranged in the communication hole. It was a problem common to pipe fittings.

The present invention has been made to solve at least a part of the above-mentioned problems, and can be realized as the following forms.

(1) One embodiment of the present invention is a pipe joint for joining a flexible pipe in a state of being sealed between the flexible pipe and the flexible pipe. This pipe joint is a joint body having an inner hole into which a flexible pipe is inserted from one end in the axial direction, and an annular member into which the flexible pipe is inserted. A moving member that is partially inserted into the hole and can move to a predetermined lock position, the moving member has a communication hole that communicates the inside and the outside, and the moving member is in the lock position. When moved to, at least a portion of the outer opening of the communication hole is covered by the joint body, and the moving member further extends the outer opening of the moving member in the circumferential direction without extending over the entire circumference of the moving member. It is provided with an indicator unit that indicates the position. According to this form of pipe joint, when the moving member moves to the locked position, the indicator unit allows the operator to know from the outside at which position in the circumferential direction the outer opening of the communication hole is located. Therefore, it is easy to bring the gas sensor close to the opening of the communication hole. Therefore, according to this form of the pipe joint, it is possible to shorten the time required for the work of detecting the perforation defect of the metal corrugated pipe after the construction in which the flexible pipe is connected.

(2) In the pipe joint of the above-described embodiment, a selective permeable member that allows gas to permeate and does not permeate liquid water may be arranged in the communication hole. According to this form of pipe joint, when the moving member moves to the locked position, at least a part of the outer opening of the communication hole is covered with the joint body, so that the selective transparent member does not come off from the communication hole. Can be prevented. Therefore, according to this form of the pipe joint, it is possible to prevent the selective permeability member from falling off after the construction in which the flexible pipe is connected.

(3) In the pipe joint of the above-described form, the indicator portion may be a counterbore portion formed in the outer opening. According to this form of the pipe joint, the indicator portion can be configured by a simple configuration of a counterbore portion provided in the communication hole, so that the configuration is easy.

(4) In the pipe joint of the above form, when the moving member moves to the locked position, a part of the selective transparent member is positioned outside the one end of the joint body in the axial direction. However, the part of the selective transparency member may serve as the indicator portion. According to the pipe joint of this form, the indicator portion can be replaced with a selective transparent member, so that the configuration is easy.

(5) In the pipe joint of the above form, the moving member movably engages with the inner hole, and the pipe joint further seals the flexible pipe and the joint body in the inner hole. The airtight packing may be provided, and a retainer that engages with the flexible pipe and connects the flexible pipe to the joint body in the inner hole may be provided. According to this form of pipe fitting, the airtight packing seals the flexible pipe, and the retainer pushed by the moving member makes the connection with the flexible pipe. Therefore, it is possible to improve the function of connecting the flexible pipe in a state of being sealed between the flexible pipe and the flexible pipe.

(6) In the pipe joint of the above form, the retainer may engage with the flexible pipe by receiving a pressing force due to the movement of the moving member to the lock position. According to this form of the pipe joint, the retainer can be operated by a simple operation of moving the moving member to the locked position, so that the configuration is easy.

It is a partial cross-sectional side view which shows the state after the insertion process of the pipe joint as 1st Embodiment. It is a partial cross-sectional side view which shows the state after a pipe joint lock process. It is sectional drawing which shows the state which disassembled a pipe joint. It is a partial cross-sectional side view which shows the push nut which a pipe joint has. It is a top view of a push nut. It is a partially enlarged side view which shows the periphery of the selective transmissive member in FIG. It is a top view of the part shown in FIG. It is a top view around the push nut provided in the pipe joint as a 2nd Embodiment. It is a top view around the push nut provided in the pipe joint as a 3rd Embodiment.

A. First Embodiment:
The pipe joint as the first embodiment of the present invention is between the flexible pipe by performing an insertion step of inserting the flexible pipe into the pipe joint and a locking step of connecting the inserted flexible pipe to the pipe joint. It has a structure that can connect flexible pipes in a sealed state.

FIG. 1 is a partial cross-sectional side view showing a state after the insertion step of the pipe joint 10 as the first embodiment of the present invention, and FIG. 2 is a partial cross-sectional side view showing the state after the locking process of the pipe joint 10. FIG. 3 is a cross-sectional view showing a state in which the pipe joint 10 is disassembled. In FIGS. 1 to 3, the X direction is a direction (axial direction) along the central axis OX of the pipe joint 10. Hereinafter, the direction on the right side in the figure in the X direction is referred to as the + X direction, and the direction on the left side in the figure in the X direction is referred to as the −X direction. The "post-insertion state" is a state after the insertion step is performed and before the locking process is performed, and the flexible pipe T is not connected in the pipe joint 10. The "post-locking state" is a state in which the flexible pipe T is connected in the pipe joint 10 in the state after the locking process is performed.

The pipe joint 10 has an inner hole 21 into which the flexible pipe T is inserted from the end portion 20a on the −X direction side, and the joint body 20 in which the threaded portion 22 is formed around the end portion 20b on the + X direction side. A push nut 30 partially inserted into the inner hole 21 from the end portion 20a, and a watertight O-ring 40, a stop ring 50, a retainer 60, a packing set 70, and a stopper 80 arranged inside the inner hole 21. A watertight packing 90 mounted inside the push nut 30 is provided. The flexible pipe T is, for example, a metal corrugated pipe T1 coated with a resin T2, and when the flexible pipe T is connected to the pipe joint 10, the resin T2 near the tip is peeled off.

The joint body 20 is a tubular brass member. The inner hole 21 of the joint body 20 is a stepped cylindrical hole, and includes a large inner diameter portion 21A, a medium inner diameter portion 21B, and a small inner diameter portion 21C having different diameters in the + X direction.

The large inner diameter portion 21A is open on the side in the −X direction. The large inner diameter portion 21A accommodates the push nut 30 and the retainer 60. The push nut 30 is partially inserted into the large inner diameter portion 21A and is movably engaged with the large inner diameter portion 21A.

FIG. 4 is a partial cross-sectional side view showing the push nut 30 included in the pipe joint 10, and FIG. 5 is a plan view of the push nut 30. The push nut 30 has a tip side portion 31 having a tapered surface 31a (FIG. 4) that abuts on the retainer 60 (FIGS. 1 to 3), an annular convex portion 32, and a side (-X) into which the flexible tube T is inserted. The rear end side portion 33, which is the side on the directional side), is provided. The annular convex portion 32 is arranged between the front end side portion 31 and the rear end side portion 33, and has a larger outer diameter than the front end side portion 31 and the rear end side portion 33.

The tip side portion 31 has a first outer peripheral annular groove 31b into which the stop ring 50 enters, a second outer peripheral annular groove 31c for accommodating the annular watertight O-ring 40, and the inside and outside of the push nut 30. It has a communication hole 31d and a communication hole 31d for communication. The communication hole 31d is, for example, a circular hole, and extends straight in the radial direction. A counterbore portion 32a is formed in the outer opening of the communication hole 31d. Specifically, the counterbore portion 32a is formed at a portion overlapping the annular convex portion 32 around the outer opening of the communication hole 31d.

The rear end side portion 33 has an inner peripheral annular groove 33a (FIG. 4) for accommodating the annular watertight packing 90, and an inner flange portion 33b (FIG. 4) at the inlet end covering the inner peripheral annular groove 33a. .. The inner end portion of the inner flange portion 33b is a burrs portion 33c (FIG. 4) bent inward (on the inner peripheral annular groove 35 side).

A selective transmissive member 110 is attached to the communication hole 31d. As shown in FIG. 4, the selective transmissive member 110 is inserted so as to be pushed through the outer opening of the communication hole 31d, and is mounted in a state of being in contact with the seat surface 31df formed in the communication hole 31d. The selective transparency member 110 is mounted so as to close the communication hole 31d. The material and function of the selective transparent member 110 will be described later. In FIG. 4, 120 is a positioning collar. The positioning collar 120 is an annular member for preventing the push nut 30 from being pushed in the X direction from the position shown in FIG. 1 during transportation before the insertion step, and is made of resin, for example. As shown in FIG. 1, the positioning collar 120 is mounted around the outer periphery of the tip side portion 31 so as to close at least a part of the outer opening of the communication hole 31d in the post-insertion state, and is attached to the end portion 20a of the joint body 20. It is in contact. A part of the positioning collar 120 in the circumferential direction is cut out, and as shown in FIG. 2, it is removed from the tip side portion 31 during the locking process. In other words, the locking process is performed with the positioning collar 120 removed.

As shown in FIGS. 1 and 3, a first ring engaging groove (a groove) 23 is formed on the inner peripheral surface of the large inner diameter portion 21A included in the inner hole 21. The a-groove 23 includes a square groove portion 23a and a tapered groove portion 23b inclined from the bottom surface of the square groove portion 23a toward the inner peripheral surface of the large inner diameter portion 21A on the + X direction side. The stop ring 50 is made by molding a steel wire into a C shape, and is engaged (entered) with the square groove portion 23a in a state of being expanded in diameter until the locking process is performed. The depth of the square groove portion 23a is smaller than the diameter of the core wire of the stop ring 50.

In the large inner diameter portion 21A, a second ring engaging groove (b groove) 24 is formed on the + X direction side of the a groove 23. In the locking process, when the push nut 30 is pushed in the + X direction, the stop ring 50 is temporarily housed in the first outer peripheral annular groove 31b from the square groove portion 23a through the tapered groove portion 23b while reducing the diameter, and then the stop ring 50. By expanding the diameter when 50 comes to the position of the b-groove 24, the stop ring 50 engages (enters) the b-groove 24. The depth of the b-groove 24 is smaller than the diameter of the core wire of the stop ring 50.

A watertight O-ring 40 is arranged on the side of the large inner diameter portion 21A in the −X direction with respect to the a groove 23. The watertight O-ring 40 is an O-ring and is fitted into a second outer peripheral annular groove 31c formed on the outer peripheral surface of the push nut 30. The watertight O-ring 40 mainly functions to prevent the infiltration of liquid water from the outside to the inside of the pipe joint 10 and to make the pipe joint 10 watertight.

As described above, the large inner diameter portion 21A accommodates the retainer 60. As shown in FIGS. 1 to 3, the retainer 60 is made of an elastically deformable material (for example, engineering plastic), and has a cylindrical base 61 and a plurality of retainers extending from the cylindrical base 61 at equal intervals in the circumferential direction. It has a segment 62 and a metal (for example, brass) claw portion 63 provided at the tip of each segment 62. The outer surface of each segment 62 is a tapered surface 62a that abuts on the tip tapered surface 31a of the push nut 30. Since the inner diameters of the cylindrical base 61 and the segment 62 of the retainer 60 are larger than the outer diameter of the mountain portion of the metal corrugated tube T1, they are not caught when the flexible tube T is inserted in the insertion step (see FIG. 1). However, since there is a slit between the segments 62, when the push nut 30 is pushed in by the locking process, as shown in FIG. 2, the tapered surface 62a of the segment 62 is pressed by the tip tapered surface 31a of the push nut 30, and the segment 62 is inside. It can be bent in the direction. As a result, the claw portion 63 provided at the tip of the segment 62 engages with the valley portion of the metal corrugated tube T1. The push nut 30 corresponds to the "moving member".

The inner diameter portion 21B of the joint body 20 is formed to have a smaller diameter than the large inner diameter portion 21A. A packing set 70 is arranged in the inner diameter portion 21B. The packing set 70 includes an airtight packing 71 and a fireproof packing 72. The airtight packing 71 has a ring shape made of an elastic material such as NBR (nitrile rubber) or fluororubber. As shown in FIGS. 1 and 2, the airtight packing 71 is interposed between the outer peripheral surface of the flexible pipe T and the inner diameter portion 21B of the joint body 20 to seal between the two. The back surface of the airtight packing 71 is locked to an annular protrusion 26 formed on the inner peripheral surface of the inner diameter portion 21B.

A ring-shaped packing metal fitting 73 having an L-shaped cross section is integrally molded at the end of the airtight packing 71 on the −X direction side, and the fireproof packing 72 is arranged on the packing metal fitting 73. The refractory packing 72 is, for example, a ring-shaped member formed by mixing expanded graphite and NBR or the like. The refractory packing 72 expands and deforms when a high temperature is generated such as in a fire, and seals between the outer peripheral surface of the flexible pipe T and the inner and inner diameter portions 21B of the joint body 20.

A stopper 80 is arranged between the end of the airtight packing 71 of the packing set 70 on the + direction side and the step portion between the medium inner diameter portion 21B and the small inner diameter portion 21C. The stopper 80 is a ring-shaped member made of an elastic material such as resin or metal. The stopper 80 includes a ring portion 81 and an engaging piece portion 82 extending inward + X direction from the ring portion 81. A plurality of engaging piece portions 82 (8 in one example) are formed at equal intervals in the circumferential direction of the ring portion 81. The inclination angle of each engaging piece portion 82 with respect to the ring portion 81 is, for example, 40 ° to 60 °.

The inner diameter of the tip of the engaging piece 82 of the stopper 80 is smaller than the outer diameter of the convex portion of the flexible pipe T. Therefore, when the operator inserts the flexible tube T and reaches the stopper 80, the convex portion at the tip of the flexible tube T is pushed in while expanding each engaging piece portion 82. When the convex tip of the flexible tube T gets over each engaging piece 82, each engaging piece 82 elastically returns to its original state as shown in FIGS. 1 and 2, and becomes a concave tip of the flexible tube T. Engage. At this point, even if the operator tries to pull out the flexible tube T, the engaging piece portion 82 of the stopper 80 hits the concave portion at the tip of the flexible tube T, so that the operator can experience this feeling by hand. That is, the stopper 80 plays a role of making the operator feel that the flexible tube T is surely inserted to the position where the insertion is completed, and preventing an operation error at the time of coupling.

If a nail is accidentally driven into the metal corrugated pipe T1 during piping construction, the gas leaking from the hole formed by the nail reaches the pipe joint 10 through the gap between the metal corrugated pipe T1 and the resin T2. The gas that has reached the pipe joint 10 escapes to the outside through the communication hole 31d. As described above, the communication hole 31d is equipped with the selective permeability member 110, and the gas is guided to the outside through the selective permeability member 110 and can be detected by a gas sensor or the like. As a result, it is possible to detect a poorly perforated metal corrugated tube T1. The selective permeable member 110 is a porous member that permeates gas and does not permeate liquid water. The selective permeable member 110 can prevent the intrusion of moisture, dust, etc. for a long period of time after the piping is constructed. Such a porous member is preferably a porous body of a polymer such as polyolefin (polyethylene, polypropylene, etc.), polymethylmethacrylate, polystyrene, ethylene-vinyl acetate copolymer, polytetrafluoroethylene, and the like.

Next, how to use the pipe joint 10 will be described. As described above, the flexible pipe T can be connected to the pipe joint 10 through the insertion step and the locking step. In the insertion step, the operator inserts the flexible pipe T into the inner hole 21 of the pipe joint 10. At this time, as shown in FIG. 1, the claw portion 63 provided at the tip of the segment 62 of the retainer 60 is separated from the metal corrugated tube T1, and the flexible tube T can be smoothly inserted. The positioning collar 120 is attached to the push nut 30 before the insertion step, and prevents the push nut 30 from being accidentally pushed in the X direction before the insertion step and bending the claw portion 63 of the retainer 60.

In the locking process, the positioning collar 120 is removed, the push nut 30 is pushed in from the state of FIG. 1, moves in the + X direction, and as shown in FIG. 2, the stop ring 50 is in a position where it engages with the b groove 24. Moving. By this movement, the tapered surface 62a of the segment 62 is pressed by the tapered surface 31a at the tip of the push nut 30, and the claw portion 63 provided at the tip of the segment 62 engages with the valley portion of the metal corrugated tube T1. As a result, the flexible pipe T is coupled to the joint body 20. The position where the stop ring 50 engages with the b-groove 24 corresponds to the "lock position".

FIG. 6 is a partially enlarged side view showing the periphery of the selective transparency member 110 in FIG. 2, and FIG. 7 is a plan view of the portion shown in FIG. In the post-locking state, in the X direction, a part of the outer opening of the communication hole 31d (not all but only a part, the same applies hereinafter) is covered by the periphery of the end portion 20a on the −X direction side of the joint body 20, and the communication hole is formed. The remaining portion of the outer opening of 31d except for the partial portion is located on the outer side (the side in the −X direction) of the end portion 20a of the joint body 20. That is, in the post-locking state, in the X direction, a part of the outer opening of the communication hole 31d overlaps with the joint body 20, and the remaining part of the outer opening of the communication hole 31d does not overlap with the joint body 20.

As described above, the counterbore portion 32a is formed in the portion of the communication hole 31d that overlaps with the annular convex portion 32 on the −X direction side of the outer opening, and the counterbore portion 32a is the joint body 20. It will be located outside the end 20a. Therefore, when the operator detects the hole opening defect of the metal corrugated pipe T1, when viewed from the outside in the + Y direction, the operator has the counterbore portion 32a and the selective transmissive member mounted on the communication hole 31d. A part of 110 can be visually recognized. The counterbore portion 32a and a part of the selective transparency member 110 correspond to the “indicator portion”.

According to the pipe joint 10 of the first embodiment configured as described above, when the work of detecting the hole opening defect of the metal corrugated pipe T1, the counterbore portion 32a and the selective transparency member mounted on the communication hole 31d are used. A part of 110 can be visually recognized from the outside of the pipe joint 10. Therefore, in the above work, it is easy to bring the gas sensor close to the opening of the communication hole 31d. Further, in the post-locking state shown in FIG. 2, since at least a part of the outer opening of the communication hole 31d is covered with the joint body 20, it is possible to prevent the selective transparent member 110 from falling out of the communication hole 31d. Therefore, according to the pipe joint 10 of this form, it is possible to prevent the selective transparent member 110 from falling off after the construction in which the flexible pipe is connected, and the time required for the work of detecting the perforation defect of the metal corrugated pipe T1 is shortened. can do.

B. Second embodiment:
FIG. 8 is a plan view of the periphery of the push nut 230 included in the pipe joint as the second embodiment of the present invention. FIG. 8 is a diagram corresponding to FIG. 7 in the first embodiment, and shows the periphery of the push nut 230 in the state after the locking process. The pipe joint in the second embodiment is different from the pipe joint 10 in the first embodiment in the position of the communication hole 231d in which the selective transmissive member 110 is mounted. Since the other configurations of the pipe joint in the second embodiment are the same as the configurations of the pipe joint 10 in the first embodiment, the same components are designated by the same reference numerals as those in FIG. 7 in FIG. The description will be omitted.

The communication hole 231d is located on the + X direction side of the communication hole 31d (see FIG. 5) in the first embodiment, and in the post-locking state, the outer opening of the communication hole 31d is −X of the joint body 20 in the X direction. It is covered by the periphery of the directional end 20a. However, since the counterbore portion 32a formed in the outer opening of the communication hole 31d has the same shape and the same position as that of the first embodiment, it can be visually recognized from the outside of the pipe joint 10. The counterbore portion 32a corresponds to the “indicator portion”.

According to the pipe joint of the second embodiment configured as described above, since the counterbore portion 32a can be visually recognized from the outside of the pipe joint 10 in the state after the locking process, as in the first embodiment, In the work of detecting the perforation defect of the metal corrugated pipe T1, the time required for the work can be shortened.

C. Third Embodiment:
FIG. 9 is a plan view of the periphery of the push nut 330 included in the pipe joint as the third embodiment of the present invention. FIG. 9 is a diagram corresponding to FIG. 8 in the second embodiment, and shows the periphery of the push nut 330 in the state after the locking process. The pipe joint in the third embodiment is different from the pipe joint in the second embodiment in that there is no counterbore portion and a diamond-shaped mark 332a is attached to the portion where the counterbore portion is formed. Since the other configurations of the pipe joint in the third embodiment are the same as the configurations of the pipe joint in the second embodiment, the same components are given the same signs as those in FIG. 8 in FIG. The explanation is omitted. The mark 332 may have another shape such as a triangle or an arrow instead of the rhombus. The mark 332 corresponds to the "indicator unit".

According to the pipe joint 10 of the second embodiment configured as described above, since the mark 332a can be visually recognized from the outside of the pipe joint 10 in the state after the locking process, it is the same as that of the first and second embodiments. In addition, the time required for the work of detecting the defective perforation of the metal corrugated pipe T1 can be shortened.

D. Modification example:
The present invention is not limited to the above-mentioned first to third embodiments and modifications thereof, and can be carried out in various embodiments without departing from the gist thereof. For example, the following modifications can be made. Is also possible.

-Modification example 1:
In the first to third embodiments, the push nut 230 as a moving member is configured to be movable by engaging with the inner hole 21, but instead of this, a screw is formed in the push nut. It may be configured to be movable by screwing a screw.

-Modification example 2:
In the pipe joint described in Japanese Patent Application Laid-Open No. 2011-52763, the compression spring is released and the packing is pushed in the direction opposite to the pipe insertion direction in a state where the flexible pipe is inserted and inserted to a predetermined position. By reducing the diameter of the retainer, the retainer has a structure that locks the flexible tube. The present invention can also be applied to this configuration. The above-mentioned predetermined position is the lock position, and when the lock position is moved, at least a part of the outer opening of the communication hole is covered with the joint body. The pipe joint is further configured to include an indicator portion indicating the position of the outer opening. With this configuration as well, as in the first to third embodiments, the time required for the work of detecting the defective perforation of the metal corrugated pipe T1 can be shortened.

-Modification example 3:
In the first to third embodiments, the indicator portion is formed by the counterbore portion 32a, a part of the selective transparency member 110, and the mark, but the indicator portion is not limited to these. The indicator unit may have any configuration as long as the position of the outer opening can be visually recognized from the outside.

-Modification example 4:
In the first to third embodiments, the selective transmissive member 110 is attached to the communication holes 31d and 231d that communicate the inside and outside of the push nuts 30, 230, and 330. On the other hand, as a modification, a configuration in which the selective transmissive member is not arranged in the communication hole may be used. In a pipe joint having a configuration in which the selective permeability member is not arranged in the communication hole, it is not possible to prevent water from entering the pipe joint, but by bringing the gas sensor closer to the opening of the communication hole, the first embodiment Similarly, it is possible to detect poor perforation of a metal corrugated pipe. According to this configuration, the counterbore portion formed in the communication hole can function as an indicator portion as in the first and second embodiments, or the mark can be used as an indicator portion as in the third embodiment. Can work.

In addition, among the constituent elements in the above-described embodiment and each modification, the elements other than the elements described in the independent claims are additional elements and can be omitted as appropriate.

10 ... Pipe joint 20 ... Joint body 20a ... End 21 ... Inner hole 21A ... Large inner diameter 21B ... Medium inner diameter 21C ... Small inner diameter 22 ... Male thread 23 ... a groove 23a ... Square groove 23b ... Tapered groove 24 ... b groove 26 ... annular protrusion 30 ... push nut 31 ... tip side portion 31a ... tapered surface 31b ... first outer peripheral annular groove 31c ... second outer peripheral annular groove 31d ... communication hole 31df ... seat surface 32 ... annular convex portion 33 ... Rear end side 33a ... Inner annular groove 33b ... Inner flange 33c ... Frog 40 ... Watertight O-ring 50 ... Stop ring 60 ... Retainer 61 ... Cylindrical base 62 ... Segment 62a ... Tapered surface 63 ... Claw 70 ... Packing set 71 ... Airtight packing 72 ... Fireproof packing 73 ... Packing metal fittings 80 ... Stopper 81 ... Ring part 82 ... Engagement piece 90 ... Watertight packing 110 ... Selective transparent member 120 ... Positioning collar 230 ... Push nut 231d ... Communication hole 330 ... Push nut 332a ... Mark OX ... Central axis T ... Flexible tube T1 ... Metal corrugated tube T2 ... Resin

Claims (7)

It is a pipe joint for connecting the flexible pipe with the flexible pipe sealed.
A joint body having an inner hole into which a flexible pipe is inserted from one end in the axial direction,
An annular member into which the flexible tube is inserted, a moving member that is partially inserted into the inner hole from the one end and can be moved to a predetermined lock position.
With
The moving member has a communication hole that communicates the inside and the outside.
When the moving member moves to the locked position, at least a part of the outer opening of the communication hole is covered with the joint body.
The moving member further includes an indicator portion that indicates the position of the outer opening in the circumferential direction of the moving member without extending over the entire circumference of the moving member.
Pipe fittings. The pipe fitting according to claim 1.
A pipe joint in which a selective permeable member that allows gas to pass through and does not allow liquid water to permeate is arranged in the communication hole. The pipe fitting according to claim 1 or 2.
The indicator portion is a pipe joint which is a counterbore portion formed in the outer opening. The pipe fitting according to claim 2.
When the moving member moves to the locked position, a part of the selective transparent member is located outside the one end of the joint body in the axial direction.
A pipe joint in which the part of the selective permeability member can serve as the indicator portion. The pipe fitting according to any one of claims 1 to 4.
The moving member movably engages with the inner hole and
The pipe fitting further
In the inner hole, an airtight packing that seals the flexible pipe and the joint body,
In the inner hole, a retainer that engages with the flexible pipe and connects the flexible pipe to the joint body.
With, pipe fittings. The pipe fitting according to claim 5.
The retainer is a pipe joint that engages with the flexible pipe by receiving a pressing force due to the movement of the moving member to the lock position. The pipe fitting according to any one of claims 1 to 6.
The pipe joint further surrounds the outer periphery of the moving member so as to close at least a part of the outer opening in a state where the flexible pipe is inserted into the joint body but is not locked inside the pipe joint. A fitting that comprises a positioning collar that is an annular member mounted on the fitting, wherein the positioning collar is removed before locking the flexible pipe inside the fitting.

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