JP6220658B2 - Pipe fitting - Google Patents

Description

  The present invention relates to a pipe joint for connecting a flexible pipe used for, for example, a gas pipe.

  For example, as described in Patent Document 1, the conventional pipe joint is released when the flexible pipe is inserted, the compression spring is released, and the packing is pushed in the direction opposite to the pipe insertion direction to reduce the diameter of the retainer. The retainer has a structure for locking the flexible pipe. According to this pipe joint, the operator can determine that the construction has been completed normally by pulling the flexible pipe after insertion and confirming that the flexible pipe does not come out. Here, “the construction has been completed normally” indicates that the flexible pipe is completely inserted into the pipe joint, and the flexible pipe is correctly connected to the pipe joint by the retainer.

International Publication WO / 2010/131609

  However, the conventional pipe joint has a structure in which the flexible pipe is inserted to a position where the packing and the outer surface of the flexible pipe are in contact with each other, and the gap between the flexible pipe and the packing is sealed. Even if it exists, the case where a flexible tube and packing seal may be considered. In addition, in the conventional pipe joint, further improvement in reliability, resource saving, ease of manufacture, and the like have been desired.

  SUMMARY An advantage of some aspects of the invention is to solve at least a part of the problems described above, and the invention can be implemented as the following forms.

(1) One aspect of the present invention is a pipe joint. The pipe joint includes a joint main body having an inner hole into which a flexible pipe is inserted from one end; a seal member that seals the flexible pipe and the joint main body in the inner hole; and provided in the inner hole and compressed. An elastic mechanism portion comprising: an elastic member held in a state; and a moving member that is movable in the axial direction of the inner hole upon receiving the insertion of the flexible tube, wherein the flexible tube is inserted to a predetermined position. The moving member releases the elastic member from the compressed state, and the elastic member slides the seal member in the direction opposite to the insertion direction of the flexible tube by the extension force of the elastic member; By adjoining the member and receiving a pressing force caused by sliding of the seal member, the flexible tube is engaged and pulled out. A retaining member for stopping, and the moving member includes a wing piece projecting in a direction opposite to the insertion direction of the flexible tube; the wing piece is provided only when the elastic member is in a compressed state. It is characterized by being positioned inside the seal surface on the inner diameter side of the seal member.

  According to the pipe joint of this embodiment, when the elastic mechanism portion is in the compressed state, the wing piece is always located inside the seal surface on the inner diameter side of the seal member. As long as the elastic mechanism portion is in the compressed state, the wing piece is interposed between the seal member and the flexible tube. For this reason, since a gas escape path is formed around the wing piece between the seal member and the flexible tube, when the elastic mechanism is in a compressed state without the flexible tube being inserted to a predetermined position, the seal member and Gas leakage can be reliably generated from between the flexible tube. Therefore, according to the pipe joint of this embodiment, when the elastic mechanism portion is in the compressed state, there is surely gas leakage, and when the elastic mechanism portion is in the non-compressed state (expanded state), the gas reliably There is no leakage. As a result, according to the pipe joint of this embodiment, even in the incomplete construction state where the construction is interrupted in a state where the flexible pipe is inserted to the position where the seal member and the outer surface of the flexible pipe are in contact with each other, By performing the leak inspection, there is an effect that it can be surely found that the construction is not completed normally.

(2) In the pipe joint of the above aspect, the elastic member includes a compression spring and a guide member including a support portion for supporting the compression spring at one end; and the moving member is not in contact with the guide member The compression spring may be extended in accordance with the movement to the position where the sealing member is moved, and the sealing member may be slid in the direction opposite to the insertion direction of the flexible tube. According to this structure, since a compression spring continues pushing the seal member after construction, long-term sealing performance can be improved.

(3) In the pipe joint of the above aspect, a slit may be provided at an end of the seal member on the side opposite to the insertion direction of the flexible pipe in the sealing surface on the flexible pipe side. According to this configuration, it can be further prevented that it is determined that the construction is normally completed in a state where the construction is not normally completed.

(4) In the pipe joint of the above aspect, an annular groove is provided at an end of the sealing member on the flexible tube side in the insertion direction side of the flexible tube; and the compression spring is released from a compressed state. In some cases, the wing piece of the moving member is housed in the annular groove and is not interposed between the seal member and the flexible tube. According to this configuration, when the compression spring is released from the compressed state, the wing pieces can be reliably released from the sealing surface. Therefore, when the compression spring is in the extended state, the wing piece does not enter the sealing surface between the hermetic packing and the flexible tube, and gas leakage does not occur.

(5) In the pipe joint of the above aspect, the moving member includes a locking protruding piece that protrudes in the insertion direction of the flexible tube and has a locking portion at a tip thereof; and the flexible tube is inserted to the predetermined position. In this case, the locking portion may be engaged with a predetermined position provided in the joint body. According to this configuration, after the flexible tube is inserted to a predetermined position, the moving member does not slide in the direction opposite to the insertion direction of the flexible tube. Therefore, after the flexible tube is inserted to a predetermined position, the wing piece does not enter the sealing surface between the hermetic packing and the flexible tube to cause gas leakage.

(6) In the pipe joint of the above aspect, the moving member can be divided into a first part and a second part having the wing piece in the sliding direction of the moving member; The first portion and the second portion may be connected to each other. According to this configuration, it is possible to assemble the moving member when assembling the pipe joint.

(7) In the pipe joint according to the above aspect, the moving member can be divided into a first part and a second part having the wing pieces in a sliding direction of the moving member; In the above, the first part and the second part may be connected together with the slide. According to this configuration, since the connection between the first portion and the second portion is not necessary when the pipe joint is assembled, the assembly is easy.

(8) In the pipe joint of the above aspect, a push nut that is partially inserted into the joint main body and into which the flexible pipe is inserted; and a mechanism that holds the push nut in a predetermined position with respect to the joint main body. A locking mechanism; the locking mechanism receives a stop ring, an annular groove formed in an outer surface of the push nut to receive the stop ring, and communicates with each other. A plurality of locking grooves formed on the inner surface of the joint body; and the stop ring is engaged across the annular groove and the first locking groove until the connection of the flexible pipe is completed. After applying the pulling direction to the flexible pipe after the connection of the flexible pipe, the stop ring moves from the first locking groove to the second locking groove on the inlet side, Also The push nut enough to confirm a successful connection of the flexible tube Te may be configured to be pulled out from the joint body. According to this configuration, the operator can confirm the connection by pulling the flexible tube.

(9) In the pipe joint of the above aspect, the indicator is provided on the push nut, the indicator is concealed in the joint body until the connection of the flexible pipe is completed, and when the flexible pipe is pulled after the connection is completed The push nut may be pulled out from the joint body and the indicator may be exposed from the joint body. According to this configuration, the visual connection confirmation can be performed more reliably.

It is a partial section side view showing the pipe joint as a 1st embodiment. It is a disassembled perspective view which shows a pipe joint. It is a decomposition | disassembly partial cross section side view which shows a pipe joint with a flexible pipe. It is a partial section side view showing a push nut. It is an expanded sectional view near the bent part of a guide member. It is explanatory drawing which shows a moving member. It is explanatory drawing which shows an airtight packing. It is explanatory drawing which shows a 3rd sealing member. It is explanatory drawing which shows the change of the latching mechanism at the time of the assembly of a pipe joint. It is a partial cross section side view which shows the construction middle 1 of a pipe joint. It is a partial cross section side view which shows the construction middle 2 of a pipe joint. It is a fragmentary sectional side view which shows the construction middle 3 of a pipe joint. It is a partial cross section side view which shows after construction of a pipe joint. It is sectional drawing which shows the positional relationship of a stop ring and a latching groove. It is a fragmentary sectional side view which shows the pipe joint as 2nd Embodiment. It is a partially broken figure of the moving member with which an elastic mechanism part is equipped. It is a perspective view when a moving member is divided | segmented. It is explanatory drawing which shows an airtight packing. It is a partial cross section side view which shows the construction middle 1 of the pipe joint as 2nd Embodiment. It is a partial section side view showing a pipe joint as a 3rd embodiment. It is a partial cross section side view which shows the construction middle 1 of the pipe joint as 3rd Embodiment.

A. First embodiment:
The pipe joint as the first embodiment of the present invention has a structure in which a flexible pipe connection process and a flexible pipe connection confirmation process are performed in two actions. By separating the connection process and the connection confirmation process, even if the construction site is narrow and dark, the operator can easily and reliably connect and confirm the flexible pipe. From the appearance of the joint, it can be confirmed reliably whether or not normal construction has been performed. In particular, since the connection process and the connection confirmation process are performed in two actions, the connection confirmation is not forgotten.

A-1. Construction:
1 is a partially sectional side view showing a pipe joint as a first embodiment, FIG. 2 is an exploded perspective view showing a pipe joint, and FIG. 3 is an exploded partial sectional side view showing the pipe joint together with a flexible pipe. . As shown in these drawings, the pipe joint 1 as the first embodiment includes a joint body 2 having an inner hole 21 into which a flexible pipe is inserted from one end side and a threaded portion 22 formed on the other end side. , A push nut 3 partially inserted into the joint body 2, an elastic mechanism part 4 mounted inside the joint body 2, a first seal member 5, a retainer 6, a stop ring 7, a second The seal member 8, the third seal member 9, and the indicator ring 10 are included. The flexible pipe is, for example, a resin-coated metal corrugated pipe.

(A) Fitting body:
As shown in FIG. 3, the inner hole 21 of the joint body 2 has an inner diameter larger than the inner diameter of the male screw portion 22 in order from the male screw portion 22 side, and slides the elastic mechanism portion 4 and the first seal member 5. The first inner diameter portion 21a to be received and the second inner diameter portion 21b having an inner diameter larger than the inner diameter of the first inner diameter portion 21a and receiving the retainer 6 and the push nut 3 by sliding. An inner annular protrusion 23 is provided at the back end of the first inner diameter portion 21a, and an annular groove 24 is provided at the inlet end of the second inner diameter portion 21b. The second inner diameter portion 21b is provided with a locking groove assembly 17 to which the stop ring 7 is mounted so as to be movable in the axial direction. The locking groove assembly 17 includes first to third locking grooves 171, 172, and 173. Further, an annular locking groove 25 is provided at the inlet side end of the inner diameter portion 22a of the external thread portion 22.

(B) Push nut:
FIG. 4 is a partial cross-sectional side view showing the push nut 3 included in the pipe joint 1. The push nut 3 receives a distal end portion 31 having a tapered surface 31 a that contacts the retainer 6, a first outer peripheral annular groove 32 into which the stop ring 7 enters, and a second annular seal member 8. The outer peripheral annular groove 33, the third outer peripheral annular groove 34 that receives the indicator ring 10 at a position close to the inlet end of the joint body 2, and the inner peripheral annular groove that receives the annular third seal member 9. It has a groove 35, a communication hole (for example, a circular hole) 36 provided in the vicinity of the inlet end of the joint body 2, and an inner flange portion 37 at the inlet end that covers the inner circumferential annular groove 35. The inner end portion of the inner flange portion 37 is a burred portion 37a bent inward (inner circumferential annular groove 35 side). Further, the selectively permeable member 12 is attached to the communication hole 36.

(C) Elastic mechanism part:
As shown in FIG. 1, the elastic mechanism portion 4 mounted between the joint body 2 and the push nut 3 has a compression coil spring 41 held in a compressed state before the flexible tube 100 is mounted. When the tube 100 is inserted to a predetermined position of the joint body 2, the compression state of the compression coil spring 41 is released and expanded, whereby the first seal member 5 is inserted in the flexible tube 100 insertion direction (X direction in the figure). The retainer 6 is brought into contact with the tip tapered surface 31a of the push nut 3 by pressing in the opposite direction (the negative direction in the X direction in the figure). In the present embodiment, the predetermined position where the flexible tube 100 is inserted is a position where the flexible tube 100 hits the back when the flexible tube 100 is inserted, and a position where the flexible tube 100 switches from the compressed state to the extended state. The details of the elastic mechanism unit 4 are as follows.

  As shown in FIGS. 1 to 3, the elastic mechanism section 4 includes a compression coil spring 41 (FIG. 1 shows a compressed state), a substantially cylindrical guide member 42 having a substantially L-shaped cross section, and a guide member. A cylindrical moving member 43 is provided inside 42 so as to be movable in the axial direction (coincident with the X direction).

  As shown in FIG. 3, the guide member 42 is formed of an elastic metal plate, and is slightly hollow in the axial direction from the position along the circumferential direction of the hollow disk-shaped support part 421 and the hollow disk-shaped support part 421. And a plurality of arc plate portions 422 extending inwardly. As shown in the enlarged cross-sectional view of FIG. 5, the arc plate portion 422 has a portion (folded portion) 422a that is bent obliquely outward at the tip, and a minute protrusion 423 on the outer surface of the bent portion 422a. Is provided.

  FIG. 6 is an explanatory view showing the moving member 43. (A) in the drawing is a cross-sectional view of a part of the moving member 43, (b) is a perspective view of the moving member 43 viewed from the negative direction side in the X direction, and (c) is a perspective view of the moving member 43 as X. It is the perspective view seen from the positive direction side of a direction. As shown in these drawings, the moving member 43 includes a flange portion 431 having a thick annular shape, a plurality (eight in this embodiment) of wings 432, and a plurality (four in this embodiment). And a locking projection 433.

  As shown in FIGS. 6A and 6B, each wing portion 432 extends (protrudes) in the axial direction (corresponding to the X direction) from the end portion 431a on the negative direction side in the X direction in the flange portion 431. The wings 432 are arranged in a circular shape. In addition, each wing | blade part 432 becomes the structure which the wing | blade base part 432a located in the root side (flange part 431 side), and the wing piece 432b located in the front end side connected, Furthermore, it is in the front-end | tip of the wing piece 432b. It has the part (bending part) 432c bent diagonally outward. The wing base 432a is thick, and a step 432d is formed. The tip of the metal corrugated tube 101 can come into contact with the step 432d. The wing piece 432b is thinner than the wing base 432a and is located slightly outside (the wall surface side of the inner hole 21).

  As shown in FIGS. 6 (a) and 6 (c), the locking protruding piece 433 is an arcuate plate shape extending (protruding) in the axial direction from the end portion 431b on the positive side of the flange portion 431 in the X direction. And is narrower than the wing portion 432. At the tip of the locking projection piece 433, a locking portion 433a protruding outward (the wall surface side of the inner hole 21) is provided. The inner surface of the locking protruding piece 433 is substantially flush with the inner diameter portion 22a of the external thread portion 22 (see FIG. 1), and when the flexible tube 100 is inserted into a position where it hits the back, The latching portion 433a is engaged with the latching groove 25 provided in the inner diameter portion 22a.With this configuration, when the flexible tube 100 is inserted to a position where it strikes the back, the latching protruding piece 433 is inserted into the joint body. 2, the moving member 43 is connected to the joint body 2.

  The flange portion 431 can contact the arc plate portion 422 of the guide member 42. On the outer peripheral surface of the flange portion 431, an annular recess 431c into which a minute protrusion 423 provided on the outer surface of the bent portion 422a of the arc plate portion 422 is fitted is provided. Since the annular recess 431c is a minute groove, it is described only in FIG. 6A, and the other drawings are omitted for convenience of illustration. The moving member 43 is preferably made of a material having a low specific gravity, a high strength, and a low coefficient of friction, such as engineering plastic, in order to smoothly slide.

  As shown in FIG. 1, before the flexible tube 100 is inserted into the joint body 2, the compression coil spring 41 has a hollow disk-like support portion 421 (FIG. 3) of the guide member 42 and an inner ring of the joint body 2. The tip bent portion 422 a of the arc plate portion 422 of the guide member 42 is engaged with the inner annular protrusion portion 23 while being compressed between the protrusion portion 23 and the protrusion portion 23. Thereby, the guide member 42 is engaged in the joint body before the flexible tube 100 is mounted. The moving member 43 is disposed inside the guide member 42, and the arc plate portion 422 (FIG. 3) of the guide member 42 is sandwiched between the inner annular protrusion 23 of the joint body 2 and the flange portion 431 of the moving member 43. The inner diameter of the inner annular projection 23 and the flange portion 431 are adjusted so that the clamping force of the arc plate 422 of the guide member 42 by the inner annular projection 23 and the flange 431 is larger than the elastic force of the compression coil spring 41. The outer diameter and the thickness of the arc plate portion 422 are determined.

(D) First sealing member:
As shown in FIGS. 1 to 3, the first seal member 5 that seals the tip of the metal corrugated pipe 101 includes an airtight packing 51 and a fireproof packing 53 connected to the airtight packing 51. The airtight packing 51 has an outer diameter slightly larger than the inner diameter of the first inner diameter portion 21a so as to be in close contact with the first inner diameter portion 21a of the joint body 2, and the outer diameter of the metal corrugated tube 101 (the outer diameter of the peak portion). ) Has a slightly smaller inner diameter. The hermetic packing 51 has a length for sealing several pitches (for example, two pitches) of the crests and troughs of the metal corrugated pipe 101, and hermetically seals the outer peripheral side of the metal corrugated pipe 101. Can do. Since the airtight packing 51 needs to maintain sealing performance for a long period of time, it is formed of nitrile butadiene rubber (NBR) or the like having excellent gas permeation resistance.

  FIG. 7 is an explanatory view showing the hermetic packing 51. (A) in the figure is a sectional view of a part of the hermetic packing 51, (b) is a perspective view of the hermetic packing 51 viewed from the negative side in the X direction, and (c) is a perspective view of the hermetic packing 51 as X It is the perspective view seen from the positive direction side of a direction. As shown in FIGS. 7A and 7B, a slit (groove) is formed on the negative end 51a in the X direction on the seal surface 51s on the inner diameter side (metal corrugated tube 101 side) of the hermetic packing 51. ) 51b is formed. The slit 51 b extends in the X direction, and the width in the X direction is substantially the same as the width of the peak portion of the metal corrugated tube 101. The slit 51b is for preventing a gas leak from occurring in an incomplete construction state and preventing the construction incomplete state from being overlooked by a gas leak inspection. The detailed operation will be described later.

  As shown in FIGS. 7A and 7C, an annular groove 51 d is formed at an end 51 c on the positive direction side in the X direction on the seal surface 51 s on the inner diameter side of the airtight packing 51. The function of the annular groove 51d will be described later. In addition, in the state before the flexible tube 100 is inserted into the joint body 2 shown in FIG. 1, the wing piece 432 b provided on the moving member 43 is positioned inside the seal surface 51 s on the inner diameter side of the airtight packing 51. doing. Moving member The first seal member 5 having such a configuration corresponds to a “seal member” included in the pipe joint described in the “Summary of Invention” section.

  As shown in FIGS. 1 to 3, the fireproof packing 53 is connected to an end portion on the negative direction side in the X direction on the seal surface on the outer diameter side (joint body 2 side) of the airtight packing 51. Even if the pipe joint 1 is exposed to a high temperature due to a fire or the like, and the rubber-made airtight packing 51 is burned out, the fireproof packing 53 is thermally expanded to fill a gap between the joint body 2 and the metal corrugated pipe 101. To prevent. When the hermetic packing 51 is burned out, the compression coil spring 41 of the elastic mechanism section 4 is extended and the guide member 42 is slid in the negative direction of the X direction. The inner surface of the main body 2 and the outer peripheral surface of the metal corrugated pipe 101 are sealed.

  The fireproof packing 53 is, for example, natural rubber (NR), nitrile butadiene rubber (NBR), chloroprene rubber (CR), ethylene-propylene rubber (EPR), ethylene-propylene-diene rubber (EPDM), silicone rubber (SR), or the like. It is produced by vulcanizing rubber, a graphite intercalation compound that is thermally expanded in a non-foamed state, a vulcanizing agent, and, if necessary, a kneaded material such as a filler and a softening material. The graphite intercalation compound is obtained, for example, by treating graphite with sulfuric acid. When the graphite intercalation compound is heated to 170 ° C. or higher, it expands several times to several tens of times without foaming, and when heated to 800 to 1000 ° C., the apparent volume increases 100 to 250 times. The volume of the refractory packing 53 and the blending amount of the graphite intercalation compound are preferably set in consideration of the expansion amount of the refractory packing 53 and the gas permeability after expansion. From the viewpoint of sealing properties, the fireproof packing 53 preferably has a Shore A hardness of 50 to 80.

(E) Retainer:
As shown in FIGS. 1 and 2, a retainer 6 made of an elastically deformable material (for example, engineering plastic) includes a cylindrical base 61 and a plurality of segments extending from the cylindrical base 61 at equal intervals in the circumferential direction. 62 and a claw portion 63 made of metal (for example, brass) provided at the tip of each segment 62. The outer surface of each segment 62 is a tapered surface 62 a that abuts on the tapered surface 31 a of the end of the push nut 3. Since the inner diameter of the cylindrical base 61 and the segment 62 of the retainer 6 is larger than the outer diameter of the crest of the metal corrugated pipe 101, it is not caught when the flexible pipe 100 is inserted in a no-load state. However, since there is a slit between the segments 62, when the taper surface 62a of the segment 62 is pressed against the tip taper surface 31a of the push nut 3 by an extension force of the compression coil spring 41 described later, the segment 62 is bent inward. 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 101. The retainer 6 having such a configuration corresponds to a “retaining member” included in the pipe joint described in the “Summary of Invention” section.

(F) Stop ring:
The stop ring 7 is an elastically deformable C-shaped member that engages with any of the first to third locking grooves 171, 172, 173 provided in the joint body 2 according to the construction work stage, The push nut 3 is held (locked) at any of a plurality of positions of the joint body 2. In order to effectively perform this function, the stop ring 7 is preferably made of an elastic metal wire such as austenitic stainless steel.

(G) Second seal member:
The second seal member 8 received in the second outer peripheral annular groove 33 of the push nut 3 is in close contact with the joint body 2 and seals the push nut 3 and the joint body 2 to prevent rainwater from entering from the outside. To do. The second seal member 8 is preferably an O-ring made of an olefin rubber such as ethylene-propylene-diene rubber (EPDM).

(H) Third seal member:
FIG. 8 is an explanatory view showing a third seal member. (A) in a figure is sectional drawing which shows a 3rd seal member, (b) is a partial expanded sectional view which shows a part of 3rd seal member with a push nut. As shown in FIG. 8A, the third seal member 9 received in the inner circumferential annular groove 35 of the push nut 3 has a substantially L-shaped cross section and is an annular shape that fits into the inner circumferential annular groove 35. The lip packing has a main body 9a and an inner lip 9b extending from the annular main body 9a. The lip packing is preferably made of an olefin rubber such as EPDM.

  The annular main body portion 9a has a step portion 9c extending outward (inner flange portion 37 side) from the inner lip 9b. As shown in FIG. 8B, the step portion 9 c of the third seal member 9 is locked to the burrs 37 a of the inner flange portion 37. When the flexible tube 100 is inserted into the push nut 3, the inner lip 9 b is elastically bent to the back side and presses the flexible tube 100 with a desired seal surface pressure. As a result, the push nut 3 and the flexible pipe 100 are sealed to prevent rainwater from entering from the outside. The insertion of the flexible tube 100 causes a stress in the rear side direction to be applied to the third seal member 9, but the engagement of the step 9c of the third seal member 9 with the burr 37a causes the third seal member 9 to There is no detachment from the annular groove 35.

(I) Indicator ring:
As shown in FIGS. 1 and 2, in order to confirm the completion of connection of the flexible pipe 100 to the pipe joint 1 and to facilitate the disassembly work of the pipe joint 1 in which the flexible pipe 100 is inserted, the indicator ring 10 is provided. A third outer peripheral annular groove 34 of the push nut 3 is detachably mounted. The indicator ring 10 is a metal C-shaped ring, and has an inner diameter smaller than the outer diameter of the third outer peripheral annular groove 34 in an unloaded state. In a state where the push nut 3 is inserted into the joint body 2, the indicator ring 10 is covered with the annular groove 24 at the inlet end of the joint body 2 and cannot be seen from the outside. However, when the flexible space 0 is pulled to confirm the completion of the connection of the flexible pipe 100 to the pipe joint 1, the stop ring 7 enters the second locking groove 172 and the indicator ring 10 is connected to the joint body as will be described later. The two annular grooves 24 are exposed. The indicator ring 10 is preferably colored differently from the joint body 2 and the push nut 3 so that complete joining of the flexible pipe 100 to the pipe joint 1 can be visually confirmed.

(J) Selective permeability member:
The permselective member 12 is provided in the communication hole 36 of the push nut 3 in order to detect a gas leak that occurs when a nail is accidentally driven into the metal corrugated pipe 101 during piping construction. Since the leaked gas enters the gap between the metal corrugated tube 101 and the resin coating 102, it can be guided to the outside through the selectively permeable member 12 and detected by a gas sensor or the like. The permselective member 12 is a porous member that has gas permeability but can prevent intrusion of moisture, dust, and the like for a long time after pipe construction. Such a porous member is preferably a porous body of a polymer such as polyolefin (polyethylene, polypropylene, etc.), polymethyl methacrylate, polystyrene, ethylene vinyl acetate copolymer, polytetrafluoroethylene.

(K) Locking mechanism:
FIG. 9 is an explanatory view showing a change of the locking mechanism 11 when the pipe joint 1 is assembled. (A) in the figure is a sectional view showing the positional relationship between the stop ring 7 and the locking groove when the push nut 3 starts to be inserted into the joint body 2, and (b) is a cross-sectional view showing the push nut 3 in the joint body 2. It is sectional drawing which shows the positional relationship of the stop ring 7 and the latching groove in the middle of inserting in, and (c) is the latching with the stop ring 7 when inserting the push nut 3 into the joint body until it contacts the retainer 6. It is sectional drawing which shows the positional relationship with a groove | channel. The locking mechanism 11 is provided on the push nut 3 and the locking groove assembly 17 including first to third locking grooves 171, 172, 173 that are provided on the inner surface of the joint body 2 and communicate with each other. The first outer circumferential annular groove 32 is formed. The first locking groove 171 includes an annular groove 171a and a tapered groove 171b having a tapered surface whose diameter decreases from the inner surface of the annular groove 171a toward the negative direction in the X direction. The second locking groove 172 communicating with the tapered groove portion 171b of the first locking groove 171 includes a tapered groove portion 172b having a tapered surface that expands in the negative direction in the X direction, and a tapered groove portion 172b. And an annular groove portion 172a having an inner surface that is continuous with the inner surface. The tapered groove portion 171 b of the first locking groove 171 and the tapered groove portion 172 b of the second locking groove 172 form a mountain-shaped inner annular protrusion 174. The third locking groove 173 communicates with the annular groove 171 a of the first locking groove 171.

  Since the first and second locking grooves 171 and 172 communicate with each other via a mountain-shaped inner annular protrusion 174, a force for reducing the diameter of the stop ring 7 to be smaller than the inner diameter of the inner annular protrusion 174 is pressed. When added to the nut 3, the stop ring 7 can be moved from the first locking groove 171 to the second locking groove 172, and moved from the second locking groove 172 to the first locking groove 171. It can also be made. However, if the force is less than the diameter reduction force of the stop ring, the inner annular protrusion 174 causes the stop ring 7 accommodated in the first locking groove 171 to move to the second locking groove 172. To prevent.

  In the present embodiment, the stop ring 7 remains held in the first locking groove 171 in the connection process of the flexible tube 100 (see FIG. 9C), and the stop ring 7 starts only in the connection confirmation process of the flexible tube 100. So as to move from the first locking groove 171 over the inner annular protrusion 174 to the second locking groove 172 (see FIG. 9B), the inclination angle of the side surface of the inner annular protrusion 174 It is necessary to set (taper angle) α1. In other words, the stop ring 7 does not exceed the inner annular protrusion 174 due to the action of the elastic mechanism portion 4 (extension force of the compression coil spring 41), but the stop ring 7 is not effective when pulling the flexible tube 100 for connection confirmation. Needs to be set to a relatively large taper angle α1 so as to exceed the inner annular protrusion 174. Specifically, the taper angle α1 is set so that a good response (click feeling) can be obtained when an average operator performs an operation of pulling the flexible tube 100 for the connection confirmation. preferable. Further, when the push nut 3 is assembled to the joint body 2, the stop ring 7 can move from the second locking groove 172 to the first locking groove 171 so as to move beyond the inner annular protrusion 174. It is necessary to set an inclination angle (each taper) α2 on the other side surface of the protrusion 174. The taper angles α1 and α2 are, for example, 40 to 50 °. Of course, the taper angles α1 and α2 can be appropriately changed according to the extension force of the compression coil spring 41.

  In this embodiment, (i) the relationship between the total length of the first locking groove 171 and the second locking groove 172 and the diameter D of the stop ring 7, and (ii) the first locking groove 171. Relationship between depth and length and diameter D of stop ring 7, (iii) Relationship between depth and length of second locking groove 172 and diameter D of stop ring 7, (iv) Relationship between third locking groove 173 By appropriately setting the relationship between the depth and length and the diameter D of the stop ring 7 and the like, the movement between the locking grooves 171 to 173 of the stop ring 7 can be performed smoothly. The relationship can be as described in Patent Document 1 (International Publication WO / 2010/131609).

A-2. Connection work:
(A) Assembling pipe fittings;
In order to assemble the pipe joint 1 in such a form that it can be used immediately at the piping site, first, the compression coil spring 41, the guide member 42 and the moving member 43 are set in the joint body 2 as shown in FIG. Then, the first seal member 5 comprising the airtight packing 51 and the fireproof packing 53, and the retainer 6 are inserted into the joint body 2, and finally the second seal member 8, the third seal member 9 and the indicator ring 10 are attached. The attached push nut 3 is inserted into the joint body 2. At this time, the stop ring 7 is first inserted into the first outer peripheral annular groove 32 of the push nut 3 as shown in FIG. Since the first outer peripheral annular groove 32 is deeper than the diameter D of the stop ring 7, the stop ring 7 is completely accommodated in the first outer peripheral annular groove 32, and the push nut 3 can slide in the joint body 2 without resistance. The first outer peripheral annular groove 32 is aligned with the second locking groove 172 while the push nut 3 is entering, and the stop ring 7 enters the second locking groove 172 as shown in FIG. 9B. However, when the push nut 3 is further slid, the stop ring 7 enters the first locking groove 171 as shown in FIG. 9C over the mountain-shaped inner annular protrusion 174. Since the depth of the first locking groove 171 is smaller than the diameter D of the stop ring 7, the stop ring 7 straddles the first locking groove 171 and the first outer peripheral annular groove 32. In this way, the pipe joint 1 is assembled.

(B) Flexible tube insertion operation:
FIG. 10 is a partial cross-sectional side view showing the middle of construction 1 of the pipe joint 1, FIG. 11 is a partial cross-sectional side view showing the middle of construction 2 of the pipe joint 1, and FIG. It is a partial cross section side view. By inserting the flexible pipe 100 from which the resin coating 102 having a length of several mountains is removed from the tip portion into the pipe joint 1, the construction progresses in the order of construction 1, construction 2, and construction 3. The state in the middle of construction 1 is a state when the tip of the metal corrugated tube 101 abuts on the step 432d of the moving member 43 as shown in FIG. When the flexible pipe 100 is further pushed into the joint body 2 from the state during the construction 1, the flange portion 431 of the moving member 43 is displaced from the inner annular projection 23 of the joint body 2 as shown in FIG. As shown in FIG. 12, the arc plate portion 422 of the guide member 42 is released from the clamping between the inner annular protrusion 23 and the flange portion 431 of the moving member 43 (state of construction 3). ).

  In the state 3 in the middle of the construction in FIG. 12, the guide member 42 pushes the airtight packing 51 of the first seal member 5 by the extension force of the compression coil spring 41. The retainer 6 pushed by the first seal member 5 slides in the negative direction of the X direction and is pressed against the tip tapered surface 31a (FIG. 4) of the push nut 3. When the taper surface 62a of the segment 62 of the retainer 6 contacts the taper surface 31a of the push nut 3, the segment 62 is deformed inward, and the taper surface 62a (FIG. 9) of the segment 62 is in close contact with the taper surface 31a of the push nut 3. At the same time, the claw portion 63 of the segment 62 is engaged with the valley portion of the metal corrugated tube 101. As a result, the flexible pipe 100 is not detached from the pipe joint 1. During this insertion operation of the flexible tube 100, the compression coil spring 41 extends instantaneously and pushes the guide member 42, so that a clicking sound is made. From this click sound, it can be confirmed that the flexible pipe 100 is normally joined to the pipe joint 1.

  When the compression coil spring 41 is opened, the hermetic packing 51 expands in the radial direction due to the compression in the axial direction by the extension force, so that the sealing performance between the joint body 2 and the flexible tube 100 is improved. Therefore, even if the metal corrugated pipe 101 has some deformation (for example, flattening or bending), the flexible pipe 100 can be airtightly joined to the joint body 2. The sealing member 8 secures the sealing property between the joint body 2 and the push nut 3, and the sealing member 9 that is in close contact with the outer peripheral surface of the flexible tube 100 secures the sealing property between the flexible tube 100 and the push nut 3. Prevent intrusion of rainwater.

  In addition, in the state in the middle of construction 2 and the state in the middle of construction 3, that is, after the flexible tube 100 is inserted until it hits the back, the latching portion 433a formed on the latching protruding piece 433 becomes the inner diameter portion 22a. Since it is engaged with the provided locking groove 25, the moving member 43 is connected to the joint body 2 and does not slide in the negative direction of the X direction.

(C) Connection confirmation of flexible pipe:
The flexible pipe 100 is normally joined to the pipe joint 1 in the state 3 in the middle of the construction shown in FIG. 12, but in order to confirm it and allow the construction manager to confirm later, the flexible pipe 100 is piped. Pull from the joint 1. Since the flexible tube 100 is firmly connected to the push nut 3 by the airtight packing 51 and the claw portion 63 of the retainer 6, the push nut 3 is slightly detached from the joint body 2 together with the flexible tube 100, as shown in FIG. 13. As shown, the indicator ring 10 emerges from the annular groove 24 of the joint body 2.

  At this time, as shown in FIG. 14, the stop ring 7 moves from the first locking groove 171 to the second locking groove 172 over the inner annular protrusion 174, and the second locking groove 172. It is held at a position straddling the first outer peripheral annular groove 32. Even if the push nut 3 is further pulled out from this position, the stop ring 7 pushed by the first outer peripheral annular groove 32 hits the vertical inner wall on the inlet side of the second locking groove 172, so that the push nut 3 slides. Never do. On the other hand, even if the push nut 3 is pushed into the joint body 2, it does not slide easily due to the elastic force of the compression coil spring 41. As described above, since the relative movement between the push nut 3 and the joint body 2 is prevented, even if a pulling force acts on the flexible pipe 100, the flexible pipe 100 does not come out of the pipe joint 1, and the flexible pipe 100 is inserted. It can be confirmed that the construction (connecting with the pipe joint 1) is normally completed.

  As shown in FIG. 13, with the indicator ring 10 that appears from the joint body 2, the construction manager can confirm the completion of the connection of the flexible pipe by palpation even if the construction site is narrow and dark. If at least the outer peripheral surface of the indicator ring 10 is colored in a color different from that of the joint body 2 and the push nut 3, the completion of the connection of the flexible pipe can be confirmed visually. Thus, by adding a step of pulling the flexible tube 100 after the flexible tube 100 is pushed in, not only can the completion of the connection of the flexible tube 100 to the pipe joint 1 be surely confirmed, but also whether the connection work has been performed normally. Anxiety can be completely eliminated.

  In the pipe joint 1 of the present embodiment, the pipe joint 1 can be disassembled by removing the indicator ring 10 from the push nut 3 and pushing the push nut 3 into the joint body 2. Since it is not related to the gist of the present invention, the description is omitted.

(D) Movement of the moving member wings:
As described above, in a state before the flexible tube 100 is inserted into the joint body 2, the wing piece 432 b provided in the moving member 43 is positioned inside the seal surface 51 s on the inner diameter side of the airtight packing 51 (FIG. 1). reference). When the insertion operation of the flexible tube 100 is performed, the moving member 43 does not slide in the state in the middle of the construction in FIG. 10, and most of the wing pieces 432 b provided on the moving member 43 are sealed with the airtight packing 51 and the metal corrugated. It is interposed between the tube 101. As a result, for example, the first crest portion and the second crest portion from the tip of the metal corrugated tube 101 are in a state in which the wing pieces 432b are interposed without directly contacting the seal surface 51s of the airtight packing 51.

  In the state 2 in the middle of the construction in FIG. 11, the moving member 43 starts to slide in the positive direction of the X direction, and almost half of the axial length of the wing piece 432 b is the airtight packing 51 and the metal corrugated pipe 101. Intervene between. As a result, for example, the second crest portion from the tip of the metal corrugated pipe 101 is in a state in which the wing pieces 432b are interposed without directly contacting the seal surface 51s of the airtight packing 51, and the airtight packing is provided at the third crest portion. 51 slits 51b face each other. The state 2 in the middle of the construction is a state immediately before the compression coil spring 41 shifts from the compressed state to the non-compressed state. Until this state, the wing piece 432b is located inside the seal surface 51s of the airtight packing 51, and the airtight packing. 51 and a metal corrugated pipe 101.

  In the state 3 in the middle of the construction in FIG. 12, most of the wing pieces 432 b are separated from the space between the airtight packing 51 and the metal corrugated pipe 101, and the bent portion 432 c at the tip of the wing pieces 432 b is an annular groove of the airtight packing 51. 51d.

A-3. Action, effect:
According to the pipe joint 1 of the first embodiment configured as described above, when the guide member 42 is sandwiched between the inner annular protrusion 23 of the joint body 2 and the flange part 431 of the moving member 43, that is, When the compression coil spring 41 is in a compressed state, the wing piece 432b provided in the moving member 43 is necessarily located inside the seal surface 51s (see FIG. 7A) on the inner diameter side of the hermetic packing 51. For this reason, in a state where the tip of the metal corrugated tube 101 has reached the inside of the seal surface 51 s, the blade 432 b is interposed between the airtight packing 51 and the metal corrugated tube 101 as long as the compression coil spring 41 is in a compressed state. It will be. When the wing pieces 432b are interposed between the airtight packing 51 and the metal corrugated pipe 101, gas escape paths are formed between the metal corrugated pipe 101 and the airtight packing 51 and between the wing pieces 432b. For this reason, when the compression coil spring 41 is in a compressed state without being inserted until the flexible tube 100 hits the back, it is possible to reliably cause gas leakage from the gas escape path.

  For example, in the state in the middle of the construction in FIG. 10, as described in the column “(d) Operation of the blade of the moving member”, the first mountain portion and the second mountain portion from the tip of the metal corrugated pipe 101. Is not in direct contact with the sealing surface 51s of the airtight packing 51 and is in a state of interposing the wing pieces 432b, so that gas leakage can be reliably generated from the first and second peak portions. it can. Similarly, even in the state 2 in the middle of the construction in FIG. 11, the second mountain portion from the tip of the metal corrugated tube 101 is in a state in which the blade 432 b is interposed between the sealing surface 51 s of the airtight packing 51, Gas leakage can be reliably generated from the second mountain portion. In addition, since the slit 51b of the airtight packing 51 faces the third mountain portion in the state 2 in the middle of the construction in FIG. 11, gas leakage can be further ensured by this slit 51b.

  Therefore, according to the pipe joint 1, when the compression coil spring 41 is in a compressed state, there is surely gas leakage, and when the compression coil spring 41 is in an uncompressed state, there is no reliable gas leakage. As a result, according to the pipe joint 1, even if the construction that is not inserted and the construction is interrupted in a state where the compression coil spring 41 is not released until the flexible pipe 100 hits the back, the construction is interrupted. By performing the gas leak inspection, there is an effect that it can be surely found that the construction is not completed normally.

  Further, according to the pipe joint 1, after the flexible pipe 100 is inserted until it hits the back, the moving member 43 is connected to the joint main body 2, and therefore the moving member 43 is inserted in the flexible pipe 100. And will not slide in the opposite direction. For this reason, after the flexible tube 100 is inserted until it hits the back, the wing piece 432b of the moving member 43 enters the sealing surface between the airtight packing 51 and the metal corrugated tube 101 to cause gas leakage. There is no.

  Furthermore, according to the pipe joint 1 of the first embodiment, since the annular groove 51d is formed on the seal surface 51s of the airtight packing 51, in the state 3 in the middle of the construction in FIG. The bent portion 432 c at the tip of the piece 432 b is accommodated in the annular groove 51 d of the airtight packing 51. For this reason, according to the pipe joint 1, when the compression coil spring 41 shifts from the compressed state to the extended state, the wing piece 432b can be reliably released from the seal surface 51s.

B. Second embodiment:
FIG. 15 is a partial cross-sectional side view showing a pipe joint as a second embodiment of the present invention. The pipe joint 1B as the second embodiment is different from the pipe joint 1 as the first embodiment in terms of the moving member 43B provided in the elastic mechanism portion 4B and the airtight packing 51B provided in the first seal member. The other configuration is the same as that of the pipe joint 1 in the first embodiment. The same components as those in FIG. 15 are denoted by the same reference numerals in FIG.

  FIG. 16 is a partially cutaway view of the moving member 43B provided in the elastic mechanism portion 4B. FIG. 16A is a view when the moving member 43B is assembled, and FIG. 16B is a view of the moving member 43B. It is the one at the time of division. FIG. 17 is a perspective view when the moving member 43B is divided. FIG. 17A shows the moving member 43B viewed from the negative direction side in the X direction, and FIG. 17C shows the moving member. 43 is viewed from the positive direction side in the X direction. The moving member 43B in the second embodiment is different from the moving member 43 (FIG. 6) of the first embodiment in that it does not include the locking protruding piece 433 and a point that can be divided into two. Other configurations are the same. In addition, about the same component, the code | symbol same as FIG. 6 was attached | subjected in FIG.

  The moving member 43B has a first portion 43B-1 on the side having the flange portion 431 and a side having the wing piece 432b around the center in the axial direction (coincident with the X direction) of the wing base portion 432a in the first embodiment. It can be divided into the second portion 43B-2. At the end of the first portion 43B-1 on the second portion 43B-2 side, a locking protruding piece 438 extending in the positive direction of the X-axis direction is provided, and the second portion 43B-2 An annular locking groove 439 is provided on the inner diameter side. By engaging the locking protruding piece 438 with the locking groove 439, the first portion 43B-1 and the second portion 43B are engaged. -2 are linked. This connection is performed using a jig when the pipe joint 1B is assembled.

  FIG. 18 is an explanatory view showing the airtight packing 51B. (A) of the figure shows a sectional view of a part of the hermetic packing 51B, and (b) of the figure shows a perspective view of the hermetic packing 51B as viewed from the negative direction side in the X direction. The perspective view which looked at the airtight packing 51 from the positive direction side of the X direction to c) was shown. This airtight packing 51B is different from the airtight packing 51 in the first embodiment in that it includes a plurality (four in this embodiment) of locking claws 52B, and the other configurations are the same. In addition, about the same part, the code | symbol same as FIG. 7 is attached | subjected in FIG. 18, and the description is abbreviate | omitted.

  As shown in FIGS. 18 (a) and 18 (b), each locking claw 52B is connected to the seal surface 51s on the inner diameter side of the hermetic packing 51 from the end 51c on the positive side of the hermetic packing 51 in the X direction. It is a piece-like member that is flush and extends in the positive direction of the X direction, and has a claw 52Ba that protrudes outward (on the guide member 42B side and on the upper side in FIG. 18A) at its tip. . The material of the locking claw portion 52B is the same material as the airtight packing 51B.

  As shown in FIG. 18A, the outer surface of the locking claw portion 52B is in contact with the circular arc plate portion 422B of the guide member 42B, and the claw 52Ba is engaged with a predetermined portion of the hollow disk-like support portion 421. Combined. As shown in FIG. 3, the hollow disc-shaped support portion 421 has a disc-shaped flange portion and a cylindrical portion extending in the axial direction, not a complete disc shape. The claw 52Ba (FIG. 18A) is engaged with a portion (corresponding to the predetermined portion) where the circular arc plate portion 422 is not extended at the end portion 421E on the positive direction side in the X direction of the cylindrical portion. With this configuration, as shown in FIG. 15, when the guide member 42 is sandwiched between the inner annular projection 23 of the joint body 2 and the flange portion 431 of the moving member 43, that is, the compression coil spring 41 is in a compressed state. When it is, the airtight packing 51 </ b> B is connected to the joint body 2 via the guide member 42.

  According to the pipe joint 1B of the second embodiment configured as described above, as with the pipe joint 1 of the first embodiment, as long as the compression coil spring 41 is in a compressed state, the blades provided to the moving member 43B are provided. The piece 432b is necessarily located inside the sealing surface on the inner diameter side of the airtight packing 51B. For this reason, when the construction is interrupted without the compression coil spring 41 being released without being inserted until the flexible pipe hits the back, the metal corrugated pipe is subjected to gas leak inspection for confirming the completion of construction. Gas leakage can surely occur from the gas escape path between 101 and the airtight packing 51B and between each blade 432b.

  FIG. 19 is a partial cross-sectional side view showing the middle 1 of construction of the pipe joint 1B. “In the middle of construction 1” is a state when the tip of the metal corrugated pipe 101 is in contact with the step 432d (see FIG. 16A) of the moving member 43, as in the description of the first embodiment. In the state in the middle of the construction 1, as in the state in the middle of construction 1 in FIG. 10 in the first embodiment, the first mountain portion and the second mountain portion from the tip of the metal corrugated pipe 101 are sealed with the airtight packing 51 </ b> B. The blade 432b of the moving member 43B is interposed without directly contacting the surface 51s. For this reason, gas leakage can be reliably generated from the first mountain portion and the second mountain portion.

  Therefore, according to the pipe joint 1B, as in the first embodiment, the construction is interrupted in a state where the compression coil spring 41 is not released without being inserted until the flexible pipe 100 hits the back. Even in an incomplete state, there is an effect that it is possible to surely find out that the construction is not completed normally by performing the gas leak inspection.

  Furthermore, according to the pipe joint 1B, as described above, when the compression coil spring 41 is in the compressed state, the hermetic packing 51B is connected to the joint body 2 by engaging with the guide member 42B. In the state where the compression coil spring 41 is not released, the airtight packing 51B does not slide in the direction opposite to the insertion direction of the flexible tube 100 (the negative direction in the X direction in FIG. 1). For this reason, in the prior art, when the connection is confirmed in a state where the flexible tube is not inserted until it hits the back, the airtight packing slides in the direction opposite to the insertion direction of the flexible tube by the connection confirmation operation. Although the indicator ring is exposed, there is a possibility that it is erroneously determined that the construction is normally completed. However, according to the pipe joint 1B of the second embodiment, this erroneous determination can be prevented.

C. Third embodiment:
FIG. 20 is a partial cross-sectional side view showing a pipe joint as a third embodiment of the present invention. The pipe joint 1C according to the third embodiment is different from the pipe joint 1B according to the second embodiment only in the configuration of the moving member 43C provided in the elastic mechanism portion 4C. The configuration is the same as that of the pipe joint 1C in the embodiment. The same components as those in FIG. 21 are denoted by the same reference numerals as those in FIG.

  The moving member 43C in the third embodiment of the present invention is different from the moving member 43B in the second embodiment in that the wing piece 432bC is shortened, and other components are the same as those in the second embodiment. Are the same. The wing piece 432bC in the third embodiment is substantially half the length of the seal surface 51s of the hermetic packing 51 in the X-axis direction. In addition, in the second embodiment, the first portion 43B-1 and the second portion 42B-2 constituting the moving member 43B are connected at the time of assembly, whereas in the third embodiment, the first portion 43B-1 and the second portion 42B-2 are connected. At the time of assembly, as shown in FIG. 20, the first portion 43C-1 and the second portion 43C-2 constituting the moving member 43C are assembled in a separated state.

  FIG. 21 is a partial cross-sectional side view showing the middle 1 of construction of the pipe joint 1C. As shown in FIG. 12, in the middle of construction 1 or in the middle of construction before construction 1, the tip of the metal corrugated pipe 101 abuts on the step 432d of the second portion 43C-2, so that the second portion 43C-2 is pushed and slid by the insertion operation of the metal corrugated tube 101. The second portion 43C-2 is connected to the first portion 43C-1 in the middle of construction 1 by the operation of being pushed and slid.

  According to the pipe joint 1 </ b> C of the third embodiment configured as described above, in the same manner as the pipe joint 1 </ b> B of the second embodiment, the state where the flexible pipe 100 is not inserted until it hits the back, similarly to the first embodiment. Even if the construction that is interrupted is incomplete, it is possible to reliably detect that the construction has not been completed normally by performing the gas leak inspection. Further, similarly to the second embodiment, the indicator ring can prevent erroneous determination that the construction has been normally completed. Furthermore, according to the pipe joint 1C of the third embodiment, it is not necessary to connect the first part 43C-1 and the second part 43C-2 constituting the moving member 43C at the time of assembly, so that assembly is easy. The effect that it is.

D. Variations:
The present invention is not limited to the above-described first to third embodiments and modifications thereof, and can be implemented in various modes without departing from the gist thereof. For example, the following modifications are possible. Is also possible.

・ Modification 1:
In the first to third embodiments, the flexible pipe connection process and the connection confirmation process for confirming that the flexible pipe is connected are performed in two actions. It may have a structure that is performed by a single action. Specifically, in the first to third embodiments, the inner annular protrusion 174 between the first locking groove 171 and the second locking groove 172 constituting the locking mechanism 11 has a mountain shape. However, instead of this, as described in the second embodiment in Patent Document 1, the inner annular protrusion is formed into a trapezoidal shape with a low height. With this configuration, the stop ring can be immediately moved from the first locking groove to the second locking groove by releasing the compression coil spring. Therefore, according to the pipe joint of the first modification, when the insertion of the flexible pipe is completed, the indicator ring appears from the joint body without performing the operation of pulling the flexible pipe. As a result, the connection process and the connection confirmation process can be performed with a single action.

Modification 2
The shape of the pipe joint according to the present invention is not limited to a single screw socket having a male thread portion at one end, but may have both sockets, elbows, tees, or female threads. Further, the joint structure of the present invention can be integrally provided at the end of a device such as a gas stopper or a gas meter.

  It should be noted that elements other than those described in the independent claims among the constituent elements in the above-described embodiment and each modification are additional elements and can be omitted as appropriate.

DESCRIPTION OF SYMBOLS 1, 1B, 1C ... Pipe joint 2 ... Joint main body 3 ... Push nut 4, 4B, 4C ... Elastic mechanism part 5 ... 1st sealing member 6 ... Retainer 7 ... Stop ring 8 ... 2nd sealing member 9 ... 3rd 9a ... annular main body 9b ... inner lip 9c ... step 10 ... indicator ring 11 ... locking mechanism 12 ... selective permeability member 17 ... lock groove assembly 21 ... inner hole 21a ... first inner diameter portion 21b ... second inner diameter portion 22 ... screw portion 23 ... inner annular protrusion 24 ... annular groove 31 ... tip 31a ... tapered surface 32 to 34 ... outer peripheral annular groove 35 ... inner peripheral annular groove 36 ... communication hole 37 ... inside Directional flange portion 37a ... Burr portion 41 ... Compression coil springs 42, 42B ... Guide members 43, 43B, 43C ... Moving members 43B-1, 43C-1 ... First portion 43B-2, 43C-2 ... Second portion 51, 51B ... Airtight packing 51a, 51c ... End 51b ... Slit 51d ... Annular groove 51s ... Sealing surface 52, 52B ... Locking claw 52a, 52BA ... Claw 53 ... Fireproof packing 61 ... Cylindrical base 62 ... Segment 62a ... Tapered surface 63 ... Claw part 100 ... Flexible pipe 101 ... Metal corrugated pipe 102 ... Resin coating 171 ... First locking groove 171a ... Annular groove part 171b ... Tapered groove part 172 ... Second locking groove 172a ... Annular groove part 172b ... Tapered groove part 173: Third locking groove 174: Inner annular protrusion 421: Hollow disk-like support part 422, 422B ... Arc plate part 422a ... Bent part 423 ... Projection 431 ... Flange part 431a, 431b ... End part 431c ... Annular recess 432 ... Wings 432a ... Wings base 432b ... Wings 432c ... Bent 432d ... Steps 433 ... Locking Use protruding pieces 433a ... latching portion 438 ... engaging projection piece 439 ... latching groove

Claims (9)

A pipe joint,
A joint body having an inner hole into which the flexible pipe is inserted from one end;
In the inner hole, a sealing member that seals the flexible pipe and the joint body;
An elastic mechanism comprising: an elastic member provided in the inner hole and held in a compressed state; and a movable member that is movable in an axial direction of the inner hole upon receiving the insertion of the flexible pipe, When the tube is inserted to a predetermined position, the moving member releases the elastic member from the compressed state, and the elastic member slides the seal member in the direction opposite to the insertion direction of the flexible tube. An elastic mechanism to be
A retaining member that is adjacent to the seal member and receives the pressing force caused by the sliding of the seal member to engage the flexible tube and prevent the flexible tube from being detached.
With
The moving member includes a wing piece protruding in a direction opposite to the insertion direction of the flexible tube,
Only when the elastic member is in a compressed state, the wing piece is located inside the seal surface on the inner diameter side of the seal member. The pipe joint according to claim 1,
The elastic member includes a compression spring, and a guide member including a support portion for supporting the compression spring at one end,
As the moving member moves to a position where it is not in contact with the guide member, the compression spring is extended, and the sealing member is configured to slide in a direction opposite to the insertion direction of the flexible tube. Pipe fittings. The pipe joint according to claim 1 or 2,
A pipe joint comprising a slit at an end of the sealing member on the side of the flexible pipe opposite to the insertion direction of the flexible pipe. The pipe joint according to any one of claims 1 to 3,
In the sealing surface of the sealing member on the flexible tube side, an end portion on the insertion direction side of the flexible tube is provided with an annular groove,
When the compression spring is released from the compressed state, the wing piece of the moving member is housed in the annular groove and does not intervene between the seal member and the flexible pipe. The pipe joint according to any one of claims 1 to 4,
The moving member protrudes in the insertion direction of the flexible tube, and includes a locking protruding piece having a locking portion at the tip,
A pipe joint in which, when the flexible pipe is inserted to the predetermined position, the locking portion is engaged with a predetermined position provided in the joint main body. The pipe joint according to any one of claims 1 to 5,
The moving member can be divided into a first part and a second part having the wing pieces in the sliding direction of the moving member;
A pipe joint in which the first part and the second part are connected when the pipe joint is assembled. The pipe joint according to any one of claims 1 to 5,
The moving member can be divided into a first part and a second part having the wing pieces in the sliding direction of the moving member;
A pipe joint in which the first part and the second part are connected with the slide during the construction of the pipe joint. The pipe joint according to any one of claims 1 to 7,
A push nut that is partially inserted into the joint body and into which the flexible pipe is inserted,
A locking mechanism for holding the push nut in a predetermined position with respect to the joint body;
With
The locking mechanism is
A stop ring, an annular groove formed on the outer surface of the push nut to receive the stop ring, and a plurality of grooves formed on the inner surface of the joint body to receive the stop ring and communicate with each other It consists of a locking groove,
The stop ring is engaged across the annular groove and the first locking groove until the connection of the flexible pipe is completed,
When a force in the pulling direction is applied to the flexible pipe after the connection of the flexible pipe, the stop ring moves from the first locking groove to a second locking groove on the inlet side, thereby the flexible pipe. A pipe joint in which the push nut is pulled out from the joint body to such an extent that a normal connection can be confirmed. The pipe joint according to claim 8, wherein
Wherein and indicator is provided to push the nut, the indicator is concealed in the fitting body until the connection completion of the flexible tube, wherein the push nut and pulling the flexible tube after the completion of connection is pulled out from the joint body And a pipe joint in which the indicator is exposed from the joint body.

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