JP2018066477A - Flexible pipe fitting - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a flexible pipe fitting which can improve the quality control of installation of a flexible pipe fitting.SOLUTION: A flexible pipe fitting J includes an air tight packing 4' arranged inside an inner hole of a fitting body 1. The air tight packing 4' tightly contacts with an outer peripheral surface of a flexible pipe F(figure 2) for gas sealing. In an end part of a flexible pipe inlet side of an inner hole of the air tight packing 4', a slit 4d is formed.SELECTED DRAWING: Figure 12

Description

  The present invention relates to a plug-in joint for connecting a bellows-like flexible pipe to a gas pipe or the like. In particular, the present invention relates to a flexible pipe joint that has been improved so that the completion of plug-in connection of the flexible pipe can be confirmed more easily.

Examples of the plug-in type flexible pipe joint include those according to Patent Documents 1 and 2 filed by the present applicants. This joint can be connected to the joint simply by inserting (inserting) the flexible pipe into the joint, and is excellent in workability. Moreover, the indicator ring which shows that the connection was performed normally is provided, and it is excellent also in the quality control of construction.
JP 2011-52762 A International Publication No. 2010-131609

  An object of the present invention is to provide a flexible pipe joint that has been improved so that completion of plug-in connection of the flexible pipe can be more easily confirmed.

  The flexible pipe joint of the present invention is a joint for connecting a flexible pipe having an annular unevenness formed continuously on the outer periphery thereof to a gas pipe in a plug-in manner, and connecting to an inner hole and the gas pipe A tubular joint body having a portion, an airtight packing disposed in the inner hole of the joint body, and in close contact with the outer peripheral surface of the flexible pipe, and disposed in the inner hole of the joint body. A retainer having a claw that engages and fixes the annular recess of the flexible pipe when the diameter is reduced, and a pipe insertion hole that is attached to the inner hole inlet of the joint body and into which the flexible pipe is inserted. A retainer presser having a taper surface for reducing the diameter of the claw of the retainer and holding the retainer in the inner hole of the joint main body; and disposed behind the inner hole of the joint main body, The tube is shortened before insertion, and the A spring that presses the retainer against the tapered surface of the retainer retainer and extends the diameter of the retainer pawl by extending after inserting the flexible pipe, and the flexible pipe is inserted to the insertion completion position at the back of the inner hole of the joint body A spring release mechanism that allows the spring to extend, and an indicator member that indicates that the flexible pipe is inserted and connected to the joint, and the retainer presser includes the retainer presser via the retainer. It is pushed by the spring and slightly slides, and only a part of the retainer presser that is slightly sized (the protruding part) protrudes from the inner hole of the joint body, and further, the flexible pipe is connected to the joint. In a state before the plug-in connection is completed, a retainer presser slide preventing member that prevents the retainer presser from sliding out of the joint body is provided with the retainer presser slide preventing member. It is provided so that it can be visually recognized and operated from the outer periphery of the retainer presser and the joint body.

  Insert the tip of the flexible pipe, which has been stripped for a predetermined length, into the joint (insertion), pass through the retainer retainer insertion hole → retainer claw inside → packing inside, and advance to the spring release mechanism at the back of the joint. This spring release mechanism operates when the tip of the flexible pipe is inserted to the insertion completion position at the back of the inner hole of the joint body, and allows the spring to extend in the joint inlet direction. By this extending spring, the retainer is pushed toward the inlet (the retainer may be pushed through the packing). As a result, the retainer is pressed against the tapered surface of the retainer retainer, the retainer claw is reduced in diameter and engaged with the annular recess of the flexible tube, and the flexible tube is fixed to the retainer. The retainer presser is pushed by the spring through the retainer and slightly slides, and only a slightly sized part of the retainer presser (extruding part) protrudes from the inner hole of the joint body. In addition, there may be a portion that protrudes to the outside of the joint body before construction, that is, before the spring extends (such a portion is not referred to as a “protruding portion”). The indicator member is fixed to the outer periphery of the “protruding portion” of the retainer presser. When the retainer presser protrudes from the joint body, the indicator member appears on the outer surface of the joint and becomes visible. Thereby, the installer / inspector can recognize normal completion at the time of construction.

  Here, the retainer presser should not slide out of the joint body before the flexible pipe is inserted into the joint body inner hole, the spring is extended, and the retainer claw is closed. Therefore, a retainer presser slide preventing means is provided, and the means can be visually recognized and operated from the outer periphery of the retainer presser and the joint body. As a result, the status of the retainer presser slide preventing means can be confirmed from the outside, and the retainer presser slide preventing means can be operated depending on the progress of construction / inspection so that flexible work can be performed.

  Specific examples of the slide preventing means in the flexible pipe of the present invention include “rolled transparent film type”, “lock cap type”, “clip type”, “pin type” and the like. These will be described later with reference to the drawings.

  Retainer presser slide prevention means that prevents the retainer presser from sliding before insertion of the flexible pipe to the inner hole of the joint main body can be seen and operated from the retainer presser and the outer periphery of the joint main body, preventing retainer presser slide. The status of the means can be confirmed from the outside, and depending on the progress of construction / inspection, the retainer presser slide prevention means can be operated to perform flexible work. As a result, it is possible to provide a flexible pipe joint that makes it easier to confirm the completion of the plug-in connection of the flexible pipe.

Hereinafter, specific forms of the flexible pipe joint of the present invention will be described in detail with reference to the drawings.

It is the side view (lower half) and side sectional view (upper half) which show the state before flexible tube insertion of a winding transparent film type flexible pipe joint. It is the side view (lower half) and side sectional view (upper half) which show the state of a flexible pipe insertion connection completion of a winding transparent film type flexible pipe joint. It is the side view (lower half) and side sectional view (upper half) which show the state before a flexible pipe insertion of a flexible pipe joint of a lock cap type (without a screw). It is the side view (lower half) and side sectional view (upper half) which show the state of a flexible pipe insertion connection completion of a flexible pipe joint of a lock cap type (without a screw). It is the side view (lower half) and side sectional view (upper half) which show the state before a flexible pipe insertion of the flexible pipe joint of a lock cap type (with a screw). It is the side view (lower half) and side sectional view (upper half) which show the state of a flexible pipe insertion completion of a flexible pipe joint of a lock cap type (with a screw). It is side surface sectional drawing (upper half) which shows the state before a flexible pipe insertion of a clip type flexible pipe joint. It is a front sectional view showing a clip retainer presser and a state of engagement with a joint body in a clip type flexible pipe joint. It is side surface sectional drawing (upper half) which shows the state (clip removal state) of the flexible pipe insertion connection completion of a clip type flexible pipe joint. It is side surface sectional drawing (upper half) which shows the state before a flexible pipe insertion of a pin type flexible pipe joint. It is side surface sectional drawing (upper half) which shows the state (pin extraction state) of the flexible pipe insertion connection completion of a pin type flexible pipe joint. It is a figure which shows the modification of an airtight packing, (A) is side sectional drawing of the principal part of a flexible pipe joint, (B) is side sectional drawing of the principal part of an airtight packing. It is the front view (A) and perspective view of the airtight packing of FIG. It is a figure which shows the modification of a spring cancellation | release mechanism, Comprising: It is side surface sectional drawing of a flexible pipe joint in the state before flexible pipe insertion. It is side surface sectional drawing (upper half) which shows the state of the flexible pipe insertion connection completion of the flexible pipe joint of FIG. It is a perspective view of the spring expansion | extension prevention ring of the flexible pipe joint of FIG. It is a perspective view in the free attitude | position of the spring guide of the flexible pipe joint of FIG.

F: flexible pipe, J: flexible pipe joint 1; joint main body, 1b; male thread part, 1d; spanner hanging part, 1e; concave step part, 1e '; concave groove 1f; retainer presser accommodation part (inlet side part outer periphery), 1 g; male screw, 1 h; inlet side end,
1j; body groove, 1i; pin hole, 1k; joint body inner hole, 1m; locking step portion 1s; annular groove, 1v; inlet portion 2; retainer retainer, 2a; protruding portion, 2b; Insertion hole)
2c; annular groove, 2d; tapered inner surface, 2u; pin hole, 2w; retainer pressing groove (annular groove),
2x; inlet side exposed portion, 2y; end face 3; retainer, 3b; retainer claw, 3d; taper outer surface 4; airtight packing, 4b; chamfer, 4d; slit, 4f; airtight packing inner hole 5;
6; Spring guide, 6b; Pointed part, 6c; Leg piece part, 6d; Original ring part 7; Moving piece, 7b; Thick part, 7d; End part 11: Watertight packing, 12; Indicator ring, 13; Sex members,
14; Watertight O-ring, 15; Stop ring, 16; Fireproof packing 19; Metal guide, 20; Spring extension prevention ring
101; vinyl film,
111; lock cap (without screw), 111b; locking projection, 111c; cap piece,
111d; inner surface, 111f; notch, 111m; ridge, 111n; flexible tube insertion hole
121; Lock cap (with screws),
121m; ridge, 121n; flexible tube insertion hole
121c; cylindrical portion, 121b; female screw, 121d; inner surface, 121f;
131; Clip, 131b; Knob part, 131d; Locking line part, 131f; Elastic deformation part
141; pin, 141b; pin tip,

Outline of Flexible Pipe Joint The internal structure of the flexible pipe joint J shown in FIGS. 1 to 7 and FIGS. 9 to 11 is basically the same as that disclosed in Japanese Patent Application Laid-Open No. 2011-52762 and International Publication 2010/131609. . Here, an overview of the overall configuration and operation will be described. The flexible pipe joint J of the embodiment of the present application includes a tubular joint body 1 and various parts housed therein.

When viewed from the right to the left in FIGS. 1 and 2, the outside of the joint body 1 is a male screw portion 1b, a spanner hook portion 1d, a retainer presser accommodating portion 1f, and the like. The male screw portion 1b is connected to the female screw of the joint on the gas supply pipe side. The spanner hanging portion 1d is where the spanner is hung when the screw is connected. The retainer presser accommodating portion 1f is a place where a retainer presser 2 to be described later is accommodated inside, and its inlet side end portion 1h (left end in the figure) is a portion of the opening into which the distal end portion of the flexible pipe F is inserted into the joint. is there. In this specification, the flexible tube F insertion port side (the left side in FIGS. 1 to 7 and FIGS. 9 to 11) is referred to as an “inlet side”, and the back side (FIG. 1) into which the opposite flexible tube is inserted. To the right side of FIGS. 7 to 9 and FIGS. The inner hole of the joint body 1 is a hole that receives the gas in the inner hole 1a of the male threaded portion 1b at the right end of the figure, and the hole (inner hole 1k) that accommodates various components on the inlet side (left side) It is connected to part 1h.

  The parts housed in the joint body 1 inner hole 1k are seen from the right to the left in FIGS. 1 and 2 (viewed from the back side to the inlet side), moving piece 7, spring guide 6, coil spring 5, airtight A packing 4, a retainer 3, a retainer presser 2, and the like. The moving piece 7 and the spring guide 6 constitute a “spring release mechanism” according to the present invention. That is, when the distal end of the flexible tube F is inserted to the insertion completion position at the back of the joint body inner hole 1k, the movable piece 7 is pushed by the flexible tube distal end FT (see FIG. 2) and advances to the inner side, and the spring guide 6 is disengaged. Then, the back side engagement piece 6b of the spring guide 6 can be deformed inward, and can be detached from the main body inner hole locking step 1m. As a result, the coil spring 5 is released from the operation and extends toward the inlet side. As a result, the coil spring 5 pushes the retainer 3 to the inlet side via the airtight packing 4 on the inlet side.

  The airtight packing 4 is disposed in the joint body inner hole 1k, and is in close contact with the outer peripheral surface of the inserted flexible pipe F to prevent gas passing through the joint body inner hole 1k from leaking out of the joint. A fireproof packing 16 is disposed on the inlet side of the airtight packing 4. This fireproof packing 16 expands in the event of a fire and closes between the joint body inner hole 1k and the outer surface of the flexible pipe F.

  The retainer 3 has a retainer claw 3b (see FIG. 2) that can expand and contract in the inner hole of the joint body 1 and engages and fixes the annular recess of the flexible tube F when the diameter decreases. The retainer 3 has a tapered outer surface 3d whose diameter increases toward the back side at the inlet side portion.

  The retainer presser 2 is attached to the inlet portion 1v of the joint body inner hole 1k, and has a tubular shape having a tube insertion hole 2b into which the flexible tube F is inserted. The inner surface 2d of the retainer presser 2 is formed with a tapered inner surface 2d having a diameter that increases toward the inner side. The tapered inner surface 2d abuts and slides on the tapered outer surface 3d of the retainer 3 when the retainer 3 is pushed to the inlet side by the coil spring 5, thereby reducing the diameter of the retainer claw 3b.

  On the outer surface of the retainer presser 2, an indicator ring 12, a breathable member 13, a watertight O-ring 14, and a stop ring 15 are arranged from the entrance side to the back side. A watertight packing 11 is disposed on the inner hole inlet side.

  The stop ring 15 is a C-shaped stop ring, and fixes the retainer presser 2 (after all, the flexible pipe F through the retainer 3) to the joint body 1. The inner side of the stop ring 15 is inserted into an annular groove 2 c cut on the outer periphery of the retainer presser 2. The outside of the stop ring 15 enters an annular groove 1s cut in the joint body inner hole 1k. Since the annular groove 1s has a relatively wide width in the insertion / back direction, the stop ring 15 can move in the groove width / inward direction (therefore, the retainer presser 2 can also move a little). That is, it can move by the dimension S from the state of FIG. 1 to the state of FIG. The reason why the inner diameter of the annular groove 1s on the inner surface of the joint main body is large is that the retainer presser 2 can be removed from the joint main body 1 during maintenance.

The indicator ring 12 is also a C-shaped retaining ring and is fixed to the outer periphery of the inlet side portion of the retainer retainer 2 (the protruding portion 2a). In addition, the retainer presser 2 of this embodiment has a quarter portion of the inlet side protruding from the joint body 1, but the entire portion is not referred to as a protruding portion, and the indicator ring 12 is fitted. The portion, that is, the portion that comes out of the joint body 1 when the joint connection is completed is referred to as a “protruding portion 2a”. The retainer presser 2 is pushed forward by the coil spring 5 via the retainer 3 when the joint is connected and slightly slides (only the dimension S), and a part of the retainer presser 2 on the inlet side (the protruding portion 2a). Protrudes outside (inlet side) from the inlet 1v of the joint body inner hole 1k. The outer surface of the indicator ring 12 is colored in a color (for example, blue) different from the other adjacent parts (the retainer presser 2 and the joint body 1) so as to be easily visible.

The basic operation of the flexible pipe joint J is as follows.
Insert the tip of the flexible pipe F with the coating stripped for a predetermined length into the joint (insert), pass it through the inner hole (insertion hole) 2b of the retainer retainer 2 → the inside of the retainer claw 3b → the inside of the airtight packing 4, and To the spring release mechanism (moving piece 7 and spring guide 6). This spring release mechanism operates as described above when the tip FT of the flexible pipe is inserted to the insertion completion position at the back of the joint body inner hole 1k, and allows the coil spring 5 to extend in the joint inlet direction. The extending coil spring 5 pushes the retainer 3 in the direction of the inlet via the packings 4 and 16. As a result, the retainer 3 is pressed against the tapered inner surface 2d of the retainer retainer 2, the retainer claw 3b is reduced in diameter and engaged with the annular recess of the flexible tube F, and the flexible tube F is fixed to the retainer 3. The retainer presser 2 is pressed by the coil spring 5 through the retainer 3 and slides by the dimension S, and only a part of the retainer presser 2 protrudes from the inlet 1v of the joint body inner hole 1k. The indicator ring 12 is fixed to the outer periphery of the “protruding portion 2a” of the retainer retainer 2. When the retainer retainer 2 protrudes from the inlet portion 1v of the joint body inner hole 1k, the indicator ring 12 appears on the outer surface of the joint. Visible. As a result, the installer / inspector can recognize the normal completion of the construction.

  Here, before the flexible tube F is inserted into the joint body inner hole 1k, the coil spring 5 is extended, and the retainer claw 3b is closed, the retainer presser 2 slides and protrudes from the joint body 1. The completion of connecting the joint will be displayed. Therefore, in the present invention, a retainer presser slide preventing means (vinyl film 101 in FIGS. 1 and 2) is provided, and the means can be viewed and operated from the retainer presser and the outer peripheral portion of the joint body. As a result, the status of the retainer presser slide preventing means can be confirmed from the outside, and the retainer presser slide preventing means can be operated depending on the progress of construction / inspection so that flexible work can be performed.

  Hereinafter, “wrapping transparent film type”, “lock cap type”, “clip type”, and “pin type” as specific slide preventing means in the flexible pipe joint of the present invention will be described with reference to the drawings.

Rolled transparent film type; Fig. 1 ・ 2
In this type of flexible pipe joint, the slide preventing means is a transparent resin film 101. The film 101 is wound around the inlet exposed portion 2x of the retainer presser 2 and the inlet side outer periphery 1f of the joint body 1 (the outer periphery of the retainer presser accommodating portion). In the film 101 of this example, a vinyl film placed on the outer periphery of a retainer presser or the like is heat-shrinked so as to be in close contact with the retainer presser inlet side exposed portion 2x, the main body inlet side outer periphery 1f, or the like. More specifically, the vinyl film 101 covers the end surface 2y and the outer peripheral surface of the retainer presser entrance side exposed portion 2x in close contact with each other. Further, the vinyl film 101 is in close contact with and covers the outer periphery 1f of the inlet side portion (retainer presser accommodating portion) of the joint body 1. The tip of the back side of the vinyl film 101 reaches a recessed step portion 1e formed on the back side of the main body entrance side portion outer periphery 1f.

The film 101 does not stretch even when pulled in the direction in which the flexible pipe is pulled out with the flexible pipe recess (valley) hooked on the retainer claw 3b or the like (the retainer presser 2 does not slide relative to the joint body 1), and the flexible pipe is inserted. When the coil spring 5 is extended after completion, the film 101 is also extended, the retainer presser 2 is slid with respect to the joint main body 1, and the “extrusion portion 2 a” comes out of the joint main body 1. Thereby, the operator can visually recognize the indicator ring 12 mounted on the outside of the protruding portion 2a from the outside through the transparent vinyl film 101. At this time, if the indicator ring 12 cannot be visually recognized, the construction is not completed. Therefore, when the indicator ring 12 cannot be visually recognized, it is possible to try to insert the flexible pipe F into the joint again before removing the vinyl film 101. The film material, thickness, heat shrink temperature, coil spring strength, etc. are controlled so that the above film elongation characteristics can be realized.

An example of specifications related to the vinyl film 101 is as follows.
Fitting nominal diameter 15A, outer diameter 1f of main body inlet side outer periphery 1f, length 14mm,
Retainer presser entrance side exposed portion 2x outer diameter 29mm, length 5.5mm
Pushing force of coil spring 5: 90N before release, 50N after release
Thickness of vinyl film 101, 0.06mm, trade name "PET shrink film Lx-10s made by Mitsubishi Plastics Co., Ltd."
Heat shrink temperature 130 ° C

  The vinyl film 101 can have perforations for tearing. For example, at the time of inspection after construction, it is conceivable that the inspector tears the vinyl film 101 after confirming that the indicator ring 12 has come out with the vinyl film 101 being covered. This wound transparent film mold does not require much material cost, and it is considered that there is relatively little risk of accidental dropout or erroneous operation during construction.

Lock cap (without screw) type; Fig. 3.4
The lock cap 111 has a thin sleeve shape with an inwardly protruding collar 111m. A flexible tube insertion hole 111n exists in the inner diameter portion of the flange 111m. A cap piece 111c having an arc-shaped cross section extends on the back side (right side in the figure) of the collar 111m. When the lock cap 111 is mounted, the collar 111m hits the inlet side end surface 2y of the retainer presser 2, and the cap piece 111c is along the outer surface of the inlet side outer periphery 1f of the joint body 1. A notch 111f is formed in the cap piece 111c. A locking projection 111b is provided on the inner side of the inner surface 111d of the cap piece 111c so as to protrude inward. The locking projection 111b enters and is locked into the recessed groove 1e 'formed on the inlet side outer periphery 1f of the joint body 1.

  Prior to installation of the joint plug-in connection, as shown in FIG. 3, the lock cap 111 is locked to the inlet side of the joint. In this state, the retainer presser 2 is prevented from sliding relative to the joint body 1. Here, when the flexible pipe F is inserted into the joint, the coil spring 5 pushes the retainer 3 toward the inlet side to reduce the diameter of the retainer claw 3b as described above. The retainer presser 2 is also pressed to the inlet side by the coil spring 5. Even in this case, the lock cap 111 is in the locking position shown in FIG. 3 (the locking force between the locking projection 111b and the groove 1e 'is stronger than the pressing force of the coil spring 5).

  Here, as shown in FIG. 4, when the lock cap 111 is pulled out to the inlet side, it is pushed by the force of the coil spring 5 and the protruding portion 2 a of the retainer presser 2 comes out of the joint body 1. Thereby, the operator can visually recognize the indicator ring 12 mounted on the outside of the protruding portion 2a from the outside. At this time, if the indicator ring 12 cannot be visually recognized, the construction is not completed. Therefore, when the indicator ring 12 is not visible, it is possible to try to lock the lock cap 111 to the inlet side of the joint and insert the flexible pipe F into the joint again.

Lock cap (with screw) type; Fig. 5 ・ 6
The lock cap 121 has a thin sleeve shape with an inwardly protruding flange 121m. A flexible tube insertion hole 121n exists in the inner diameter portion of the flange 121m. A cylindrical portion 121c extends on the back side (the right side in the figure) of the flange 121m. When the lock cap 121 is mounted, the flange 121m hits the inlet side end surface 2y of the retainer presser 2, and the cylindrical portion 121c is along the outer surface of the inlet side outer periphery 1f of the joint body 1. A slit-like observation window 121f is formed at the center in the depth direction of the cylindrical portion 121c. A female screw 121b is formed on the inner side of the inner surface 121d of the cylindrical portion 121c. This female screw 121b is screwed with a male screw 1g formed on the outer periphery 1f of the inlet side of the joint body 1.

  Before construction of the joint plug-in connection, the lock cap 121 is screwed into the joint body 1 as shown in FIG. That is, the flange 121m of the lock cap 121 is in contact with the inlet side end surface 2y of the retainer retainer 2, and the retainer retainer 2 is prevented from sliding relative to the joint body 1. Here, when the flexible pipe F is inserted into the joint, the coil spring 5 pushes the retainer 3 toward the inlet side to reduce the diameter of the retainer claw 3b as described above. The retainer presser 2 is also pressed to the inlet side by the coil spring 5. Even in this case, the lock cap 121 is in the locking position of FIG.

  Here, as shown in FIG. 6, when the lock cap 121 is turned and pulled out to the inlet side, it is pushed by the force of the coil spring 5, and the protruding portion 2a of the retainer presser 2 moves from the joint body 1 to the left in the figure. . And the indicator ring 12 with which the outer side of the protrusion part 2a was mounted | worn can be visually recognized from 121f of inspection windows of a lock cap. At this time, if the indicator ring 12 cannot be visually recognized, the construction is not completed. Therefore, when the indicator ring 12 cannot be visually recognized, it is possible to try to lock the lock cap 121 to the inlet side of the joint and insert the flexible pipe F into the joint again.

Clip type; Figs.
In this embodiment, as shown in FIGS. 8 and 7, the retaining wire portion 131d of the clip 131 is inserted between the main body groove 1j and the retainer pressing groove (annular groove) 2w to prevent the retainer pressing 2 from sliding. ing. That is, the annular retainer pressing groove 2w is formed on the outer surface of the retainer presser 2, and the slit groove 1j of the joint main body 1 is formed at a position (in an unprocessed state) that just matches the groove 2w. Then, a clip locking wire portion 131d having a wire diameter applied to the grooves 2w and 1j is inserted. As a result, the grooves 2w and 1j cannot move relative to each other, and an effect of preventing the clip from sliding is produced. As shown in FIG. 8, the clip 131 is a bifurcated metal wire as a whole, a pair of locking wire portions 131d facing each other so as to sandwich the joint, and a knob at a position connecting the two wire portions. Part 131b, elastically deforming parts 131f formed at both ends of the wire, and the like.

  When the clip 131 is removed from the joint, if the knob portion 131b is pinched and pulled to the left in FIG. 8, both elastically deformable portions 131f open to the outside, and the clip 131 is extracted. If it does so, both said groove | channels 2w * 1j will become movable relatively and the slide prevention effect | action of a clip will lose | eliminate. As a result, the retainer presser 2 pressed by the coil spring 5 slides to the left side of the figure as shown in FIG. 9 (ie, protrudes), and the indicator ring 12 existing on the outer periphery of the protruding portion can be visually recognized from the outside. Become. At this time, if the indicator ring 12 cannot be visually recognized, the construction is not completed. Therefore, when the indicator ring 12 cannot be visually recognized, it is possible to try inserting the clip 131 into the groove 2w · 1j and inserting the flexible pipe F into the joint again.

Pin type: Fig.10 ・ 11
In this embodiment, as shown in FIG. 10, the pin tip 141 b (round bar shape) of the pin 141 is passed through the pin hole 1 i of the main body 1 and the pin hole 2 u of the retainer presser 2 to slide the retainer presser 2. Prevention is in progress. That is, the pin hole 2u is opened on the outer surface of the retainer retainer 2, and the pin hole 1i of the joint body 1 is opened at a position (in an unworked state) that just fits the hole 2u. Then, the pin tip 141b of the pin 141 is passed through the joint body pin hole 1i, and the pin 141 is inserted so that the pin tip 141b is further immersed in the retainer pressing pin hole 2u. As a result, the two holes 2u and 1i are relatively immovable, and an effect of preventing the slide of the clip occurs.

  When removing the pin 141 from the joint, the pin 141 can be removed by pinching the flange-shaped knob portion 141d and pulling it out in FIG. If it does so, both said holes 2u * 1i will move relatively, and the slide prevention effect of the pin 141 will be lost. As a result, the retainer presser 2 pressed by the coil spring 5 slides to the left as shown in FIG. 11 (ie, protrudes), and the indicator ring 12 existing on the outer periphery of the protruding portion is visible from the outside. Become. At this time, if the indicator ring 12 cannot be visually recognized, the construction is not completed. Therefore, when the indicator ring 12 cannot be visually recognized, it is possible to try inserting the pin 141 into the hole 2u · 1i and inserting the flexible tube F back into the joint again.

A modification of the airtight packing will be described.
FIG. 12 is a view showing a modification of the airtight packing. (A) is side sectional drawing of the principal part of a flexible pipe joint, (B) is side sectional drawing of the principal part of an airtight packing. The same reference numerals as those in FIG. 1 denote the same parts as those in FIG.
13 is a front view (A) and a perspective view of the hermetic packing of FIG. 12 (B).

  The change in the hermetic packing 4 ′ of this modification is that a chamfer 4 b and a slit 4 d are formed at the end of the inner hole 4 f on the flexible pipe inlet side. As shown in FIG. 12 (B), the hermetic packing 4 ′ is joined (insert-molded) to the L-shaped metal guide 19 on the inlet side, and is placed in the L-shaped section of the metal guide 19. The fireproof packing 16 is fixed. The chamfer 4b extends from the inner surface of the metal guide 19 to the inner hole 4f of the packing 4 at an angle of approximately 36 °. The size of the chamfer 4b is, for example, a joint with a nominal diameter of 20A, a radial height of 1 mm and an axial length of 1.4 mm.

  The slit 4d is cut so as to go through the inclined surface of the chamfer 4b. In this example, four slits 4d are provided in the radial direction as shown in FIG. 13A. The slit 4d may be at least one place.

  The operation of the slit 4d is as follows. If the flexible pipe is correctly inserted into the joint, as shown in FIG. 2 and the like, two or more crests on the outer surface of the flexible pipe F engage with the inner hole 4f of the airtight packing 4 (the crest of the flexible pipe is It fits into the inner hole 4f of the airtight packing). Thus, the gas passing through the joint is sealed so as not to leak to the outside. However, if only one crest at the tip of the flexible pipe is placed on the inner hole 4f of the airtight packing due to insufficient insertion of the flexible pipe, and the slit 4d is not blocked, the airtight inspection after the piping is completed. Sometimes gas leaks out through the slit 4d, and this leakage can be detected by a pressure drop in the pipe. For this reason, it leads to improvement of quality control of flexible pipe joint construction.

Next, a modified example of the spring release mechanism will be described.
FIG. 14 is a view showing a modification of the spring release mechanism, and is a side sectional view (upper half) of the flexible pipe joint in a state before the flexible pipe is inserted. The same reference numerals as those in FIG. 1 denote the same parts as those in FIG.
15 is a side cross-sectional view (upper half) of the flexible pipe joint shown in FIG. The same reference numerals as those in FIG. 1 denote the same parts as those in FIG.
16 is a perspective view of a spring extension preventing ring of the flexible pipe joint of FIG.
FIG. 17 is a perspective view of the spring guide of the flexible pipe joint of FIG. 14 in a free posture.

In this flexible pipe joint J, the spring release mechanism includes a) a spring guide 6 having the following items 1) to 3), 1) an annular original ring portion 6d, and 2) an inner diameter portion of the original ring portion. A strip-shaped leg piece 6c that protrudes to the back side, on which the coil spring 5 is fitted, and 3) a tip-curved part 6b that warps outward from the back side end of the leg piece, b) the spring guide 6 is in contact with the inside of the leg piece portion 6c, and is moved by being pushed by the restraining position for restraining the inward inclination of the leg piece portion and the tip FT of the flexible pipe F inserted into the joint. A movable piece 7 movable between an open position allowing an inward inclination of the leg piece portion 6c, and c) a rear end portion of the coil spring 5 when the movable piece 7 is in the restrained position. And the tip 6b of the spring guide 6 so that the movable piece 7 is opened. When in the location is characterized by comprising a spring-elongation preventing ring 20 disengages from the destination warp portion 6b, a.

  As shown in FIG. 14, the feature of the modified example of the spring release mechanism of the flexible pipe joint J is that a spring extension preventing ring is provided between the back end portion of the coil spring 5 and the tip warped portion 6 b of the spring guide 6. 20 is provided. For comparison, FIG. 1 shows that there is a locking step portion 1m that protrudes inside the joint body inner hole 1k on the back side of the coil spring 5. In this modification, such a locking step portion 1m is present. There are no steps. The spring extension preventing ring 20 is a simple annular ring as shown in FIG.

  As shown in FIG. 17, the spring guide 6 includes an annular original ring portion 6d, a belt-like leg piece portion 6c protruding from the inner diameter portion of the original ring portion 6d, and a leg piece portion 6c. And a tip warp portion 6b that warps outward from the back end. In this example, the leg piece 6c and the tip warp 6b are provided in four locations distributed in the circumferential direction. FIG. 17 shows a free state in which the spring guide 6 is not constrained by another, and the leg piece 6c is slightly inclined inward. However, in the state before the flexible pipe insertion after the joint assembly shown in FIG. 14, the leg piece 6 c is constrained to the outer periphery of the thick part 7 b of the moving piece 7 and extends straight back. . In the state where the flexible pipe insertion connection is completed in FIG. 15, the leg piece 6c of the spring guide 6 is actually inclined slightly inward toward the back side. The moving piece 7 is a cylindrical member that can move to the entrance side and the back side, and a thick portion 7b is formed on the back side. The moving piece 7 is made of a material having a small specific gravity such as engineering plastic so that the movement is smooth.

  14, the coil spring and the spring release mechanism are assembled with the moving piece 7 → the spring guide 6 → the compressed coil spring 5 and the spring extension preventing ring 20 from the inside to the outside. In this state, it is arranged on the back side of the joint body inner hole 1k. In this state, the spring extension preventing ring 20 is sandwiched and fixed between the back end portion of the coil spring 5 and the tip warp portion 6 b of the spring guide 6. Therefore, although the spring extension preventing ring 20 is pushed to the back side by the compressed coil spring 5, the spring extension preventing ring 20 does not move to the back side, and the coil spring 5 does not extend.

  In the actual assembly process, the coil spring and the spring release mechanism are assembled into the joint body inner hole 1k as described above. Therefore, it is possible to easily visually check the state of each member, for example, whether the spring extension preventing ring 20 is correctly positioned between the tip warped portion 6 b of the spring guide 6 and the coil spring 5.

  When the flexible pipe F is inserted into the flexible pipe joint J from the left side (inlet side) in the figure toward the right side (back side) in the figure, the tip FT (see FIG. 15) of the flexible pipe F becomes the moving piece 7 in FIG. The moving piece 7 is pushed to the back side. Then, the moving piece 7 moves to the back side, and the thick part 7b is disengaged from the tip warped part 6b on the back side of the spring guide 6 (the back side of the spring guide 6 is the stepped part at the back of the joint body inner hole 1k). Will not move because it is hitting).

Then, the leg piece portion 6c and the tip warp portion 6b of the spring guide 6 lose support from the inside of the moving piece 7, and the inner inclined posture (by the force that the coil spring 5 pushes the spring extension preventing ring 20 to the back side) Bowing attitude). For this reason, the spring extension prevention ring 20 removes the restraint of the tip warp portion 6b of the spring guide 6, moves to the back side, and stops by hitting the step portion on the back side of the joint body inner hole 1k. At the same time, the coil spring 5 is no longer constrained to stretch, and the coil spring 5 extends. The airtight packing 4 and the retainer 3 are moved to the inlet side by being pushed by the extending coil spring 5, and the retainer claw 3b is inserted into the outer peripheral recess of the flexible tube F, so that the flexible tube F is fixed. Further, as described above, the retainer presser 2 also moves slightly toward the inlet side.

  Since the spring release mechanism of this example can be mounted in the joint body inner hole 1k in a state where the coil spring and the members constituting the mechanism are assembled as described above, the flexible pipe joint can be easily assembled.

Another form of flexible pipe joint is a joint for connecting a flexible pipe having an annular irregularity formed continuously on its outer periphery to a gas pipe in an insertion manner, and has an inner hole and a connection to the gas pipe. A tubular joint body having a connecting portion, an airtight packing disposed in the inner hole of the joint body and in close contact with the outer peripheral surface of the flexible pipe, and an expandable / reducible diameter disposed in the inner hole of the joint body And a retainer having a claw that engages and fixes the annular recess of the flexible pipe when the diameter is reduced, and the airtight packing has an inner hole that is in close contact with the outer peripheral surface of the flexible pipe on the inlet side of the flexible pipe A slit is formed at the end.

Claims (1)

A joint for connecting a flexible pipe having an annular unevenness continuously formed on the outer periphery to a gas pipe,
A cylindrical joint body having an inner hole and a connecting portion to the gas pipe;
An air-tight packing disposed in the inner hole of the joint body and in close contact with the outer peripheral surface of the flexible pipe;
A retainer disposed in an inner hole of the joint main body, having a claw capable of expanding and contracting and having a claw that engages and fixes the annular recess of the flexible pipe when the diameter decreases.
A slit is formed at the end of the flexible tube inlet side of the inner hole of the airtight packing that tightly seals with the outer peripheral surface of the flexible tube, and when the flexible tube is insufficiently inserted, gas passes through the slit. off gravel fitting it characterized by leaking to the outside.

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