JP2009127759A - Pipe fitting for flexible pipe - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pipe fitting for a flexible pipe enabling the user to easily confirm the completion of pressing of a pressing ring. <P>SOLUTION: A spacer 28 for confirming the pressing of the pressing ring is fitted between the socket part 3 of a fitting body 5 and the pressing ring 7 in a half-inserted state. A cutting blade 7c is formed on the end surface of the flange part 7b of the pressing ring 7 on the tubular part 7a side. When the pressing ring 7 in a half-inserted state is completely pressed, a part of the spacer 28 is cut by the cutting blade 7c, and comes out of the socket part 3 and the pressing ring 7. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a plug-in joint for flexible pipes that allows a flexible pipe to be connected in a seal-like manner by inserting a flexible pipe for guiding a fluid such as gas or liquid, and pushing a push wheel.

  As this type of insertion-type flexible pipe joint, for example, as shown in FIGS. 8A and 8B, a tube insertion hole 41 for inserting a flexible pipe (bellows tube) 40 is formed, and the inner wall surface is formed. A joint body 42 having a stepped shape, a push ring (nut member) 43 attached to the tip of the joint body 42 so as to be slidable in the longitudinal direction, and a packing provided on the stepped portion of the inner wall surface of the joint body 42 The member 44 is provided on the base end side of the packing member 44 so that when the flexible tube 40 is inserted, it comes into contact with the distal end of the flexible tube 40 and a part of the flexible tube 40 is elastically expanded and contracted in the radial direction. A ring-shaped stopper member 45 through which the tube 40 is inserted inward, and interposed between the pusher wheel 43 and the packing member 44, press the packing member 44 when the pusher wheel 43 is inserted, and one end side is A ring-shaped retainer member 47 that can be elastically expanded and contracted in the central direction of the rexible tube 40, and a stop ring member that is provided on the pusher wheel 43 and fixes the pusher wheel 43 when the pusher wheel 43 is inserted into the joint body 42 side. 48, the push wheel 43 comes into contact with the retainer member 47 when it is inserted into the joint main body 42, and deforms it in the direction of diameter reduction (see, for example, Patent Document 1).

  According to this flexible pipe joint, when the flexible pipe 40 is inserted into the joint main body 42, the flexible pipe 40 is inserted through the ring-shaped retainer member 47 and the packing member 44, and its tip abuts against the stopper member 45. One or more peaks are inserted while expanding or reducing the diameter of the stopper member 45, and the inner peripheral end portion of the stopper member 45 is fitted into the concave portion of the flexible tube 40. In this state, the pusher wheel 43 is further pushed in. The distal end of the retainer member 47 comes into contact with the retainer member 47 to reduce its diameter, and one end portion of the retainer member 47 is fitted into the concave portion of the flexible tube 40, and the push ring 43 is connected to the joint body 42 by the stop ring member 48. It is fixed to the side, and insertion fixing is completed with this. In this state, when a force is applied to the flexible tube 40 in the pulling direction, the stopper member 45 and the packing member 44 are moved together in the pulling direction and a force is applied to move the retainer member 47 in the pulling direction. Alternatively, since one end portion of the retainer member 47 is fitted in the recess of the flexible tube 40, a force is applied to move the retainer member 47 in the pulling direction. At this time, the retainer member 47 that is in contact with the pusher wheel 43 is compressed. Since a force is applied so that the flexible pipe 40 is prevented from being pulled out, the flexible pipe 40 is sufficiently inserted into the joint body 42 and inserted, and the push ring 43 is pushed in. The flexible tube 40 can be connected in a state where the sealing property is maintained.

JP 2003-176888 A

However, in the flexible pipe joint using the pusher wheel 43, the push-in of the pusher wheel 43 is confirmed by checking whether or not the flange 43b of the pusher wheel 43 is in contact with the inlet end of the joint body 42. Since the flange 43b of the push ring 43 is exposed at the inlet end of the joint main body 42 even if the push ring 43 is pushed in, it is difficult to determine whether the push ring 43 is insufficiently pushed or completely pushed. In particular, it is difficult to confirm in the dark or in the dark.
Further, as a means for confirming that the pusher wheel 43 is completely pushed in, the outer peripheral surface of the cylindrical part 43a of the pusher wheel 43 exposed from the inlet end of the joint body 42 is colored in red or the like, and the colored display portion Is known by the fact that it is hidden behind the joint main body 42 when it is pushed in, but the colored display portion is between the inlet end of the joint main body 42 and the flange 43b of the push ring 43. Since it is in a depressed state, it is difficult to see especially in the dark or in a dark place, and even in this case, even if the pusher wheel 43 is completely pushed in, the collar portion 43b of the pusher wheel 43 appears to be exposed at the inlet end of the joint body 42. There has been a problem that it is difficult to distinguish between insufficient push-in of the push wheel 43 and a complete push-in state.

  The present invention has been made to solve such problems. The purpose of the present invention is that the flexible tube can be connected in a seal shape by a one-touch operation by inserting the flexible tube and pushing the push wheel. An object of the present invention is to provide a joint for flexible pipes that makes it easy to confirm the completion of pushing the push wheel.

  When the present invention is described with reference to the reference numerals attached to FIGS. 1 to 5 in order to facilitate understanding of the contents of the present invention as described in claim 1, it extends to the entire circumference in the circumferential direction. A joint body 5 having a receiving portion 3 into which a tip portion of a flexible pipe 2 in which peaks 8 and valleys 9 are alternately arranged in the tube axis direction is inserted, and received in the receiving portion 3. A seal rubber 6 that seals between the inner periphery of the portion 3 and the outer periphery of the flexible tube 2 in the vicinity of the distal end portion; and a push ring 7 that is inserted into the receiving portion 3. The push ring 7 includes a cylindrical portion 7a and the cylindrical portion. 7a is formed in a shape having a flange portion 7b provided on the outer periphery of the rear end portion, and the cylindrical portion 7a is inserted into a semi-insertion state in which a pushing allowance is left in the receiving portion 3, and is pushed in completely by the pushing allowance. If the seal rubber 6 is bent, the seal rubber 6 is prevented from returning and moving toward the inlet side of the receiving portion 3 at the tip of the cylindrical portion 7a. In a certain flexible pipe joint, a cutting blade 7c is provided on the end surface of the collar portion 7b of the push ring 7 on the cylindrical portion 7a side, and a spacer 28 for confirming the pushing of the push ring is mounted between the receiving portion 3 and the push ring 7. It is characterized in that a part of the spacer 28 is cut by the cutting blade 7c and detached from the receiving part 3 and the push ring 7 when the push ring 7 in the half-inserted state is completely pushed. .

According to this configuration, after the flexible tube 2 is inserted, when the pusher wheel 7 in the half-inserted state is completely pushed, a part of the spacer 28 is cut by the cutting blade 7c of the pusher wheel 7, and the receiving portion 3 and the pusher wheel 7 are cut. Since the disengagement phenomenon is conspicuous, it can be easily confirmed that the push ring 7 is completely pushed. If a part of the spacer 28 is not removed, it can be informed that the push ring 7 is insufficiently pushed or forgotten to be pushed, and the push ring 7 can be pushed.
After the flexible tube 2 is inserted, when the push ring 7 is completely pushed in, the distal end portion of the seal rubber 6 is prevented from returning and moving toward the inlet side of the receiving portion 3, so that the flexible tube 2 by the seal rubber 6 is used. It is possible to ensure a sealing function between the vicinity of the front end portion of the rim and the inner periphery of the receiving portion 3.

In the flexible pipe joint according to claim 1, as described in claim 2, the spacer 28 includes a ring portion 28 a that is externally fitted to the cylindrical portion 7 a of the push ring 7, and a flange portion from a part of the outer periphery of the ring portion 28 a. A projecting piece 28b having an arcuate cross section projecting in the direction of 7b, and a lip 28c attached to the inner periphery of the projecting side end of the projecting piece 28b. 3, the lip 28c can be engaged with the circumferential groove 29 provided on the outer periphery of the pusher wheel 7 in the half-inserted state so as to be detachably engaged.
According to this configuration, the pusher wheel 7 can be held in the half-inserted state by the cylindrical spacer 28, and the pusher wheel 7 is inadvertently pushed before the flexible tube 2 is inserted, that is, in stock or stored, and the seal rubber 6 is deformed. Can be added.

As described in claim 3, the flexible pipe joint according to claim 1 has a large-diameter hole 11, a medium-diameter hole 12, and a small-diameter hole in the receiving portion 3 in order from the inlet side to the inner back side. 13 and the seal rubber 6 projects inwardly to a cylindrical front body 6a having an inner diameter substantially the same as the outer diameter of the crest 8 of the flexible tube 2 and to the front end of the front body 6a. A pipe end receiving portion 6b, an annular sealing action portion 6c projecting outward from the rear end portion of the front side barrel portion 6a, and an inner diameter larger than the inner diameter of the front side barrel portion 6a provided continuously from the sealing action portion 6c to the rear. A rear body 6d and an inner diameter that is connected to the rear end of the rear body 6d and is smaller than the inner diameter of the rear body 6d and larger than the outer diameter of the ridge 8 and the outer diameter of the rear body 6d. The small-diameter hole 13 and the medium-diameter hole 12 are integrally formed in a shape having a retaining protrusion 6e having a larger outer diameter. The first taper 15 is formed in a constricted shape toward the small-diameter hole 13, and the second taper 16 is formed in a constricted form between the medium-diameter hole 12 and the large-diameter hole 11. The seal rubber 6 is formed in a free state in which the tube end receiving portion 6b and the front body portion 6a are located in the small diameter hole 13 and the sealing action portion 6c is located in the medium diameter hole 12, and the retaining protrusion 6e is accommodated and disposed so as to be positioned in the large-diameter hole 11, and the distal end portion of the flexible tube 2 is moved from the presser wheel 7 in a semi-inserted state as the distal end portion of the flexible tube 2 is inserted into the receiving portion 3. The seal rubber 6 is inserted into the seal rubber 6 and brought into contact with the pipe end receiving portion 6b to push the seal rubber 6 inwardly in the receiving portion. Due to the deformation of the diameter, the valley 9 of the flexible tube 2 is small. Both of them are in close contact with the inclined surface 9a, and the retaining projection 6e is reduced in diameter by sliding the outer diameter portion thereof toward the constriction side of the second taper 16, so that the inner diameter portion is fitted into the valley portion 9 of the flexible tube 2. It is characterized by being configured as described above.
In the present specification and claims, the “free state” means a state in which the rubber seal 6 is not deformed so as to expand and contract and no compressive stress or tensile stress is applied.

According to such a configuration, the sealing and sealing state by the seal rubber 6 between the outer peripheral surface near the tip of the flexible tube 2 and the inner peripheral surface of the small-diameter hole 11 is such that the sealing action portion 6 c of the seal rubber 6 is the flexible tube 2. Since it is obtained by being in close contact with at least the inclined surface 8a of the valley portion 8, it is difficult to be affected by the distal end portion inserted into the receiving portion of the flexible tube 2, the deformation in the vicinity of the distal end portion, the bending after the construction, and the like. Thus, the sealing performance can be improved.
Further, as the flexible tube 2 is inserted into the receiving portion 3, the distal end portion of the flexible tube 2 is inserted into the seal rubber 6 and comes into contact with the tube end receiving portion 6 b so that the seal rubber 6 is moved inwardly of the receiving portion 3. Since the sealing action portion 6c is slidably contacted to the narrowed side of the first taper in accordance with the pushing, the inner diameter of the sealing action portion 6c is reduced inwardly so as to be in close contact with the valley portion 8 of the flexible tube 2. Simply plugging in can be connected in a seal-like manner.

Further, since the seal rubber 6 protrudes outward from the sealing action part 6c at the beginning, that is, before the flexible pipe is inserted, the tip part is supported by the sealing action part 6c and inserted when the tip part of the flexible pipe 2 is inserted. The flexible tube 2 can be smoothly inserted into the seal rubber 6 without causing an obstacle, and the ease of insertion of the flexible tube 2 can be ensured.
Furthermore, as the flexible tube 2 is inserted as described above and the seal rubber 6 is pushed inwardly of the receiving portion 3, the retaining protrusion 6e integrated with the seal rubber 6 makes its outer diameter portion a second taper. Since the inner diameter portion is inserted into the trough portion 9 of the flexible tube 2 by reducing the diameter by sliding contact with the squeezed side 16, simply connecting the flexible tube 2 so as to prevent it from coming off. Can do. Since the retaining protrusion 6e is formed integrally with the seal rubber 6, it is possible to reduce the number of members, the number of assembly steps, and the cost accordingly.

  According to the third aspect of the joint for flexible pipe, the presser wheel 7 in the half-insertion state is the rear side of the protrusion 6e of the seal rubber 6 before the insertion of the flexible pipe 2 in the presser wheel 7 in the half-inserted state. The first positioning and holding means that is positioned and held at an initial position that is in contact with or close to, and the presser wheel 7 that is completely pushed in, the tip of the first pusher 7 comes into the small-diameter hole 13 as the flexible tube 2 is inserted first. It is possible to employ a configuration including second positioning and holding means that is positioned and held at a pressing position that contacts or is close to the rear side of the protruding protrusion 6e of the seal rubber 6 that has been pressed.

The push ring 7 in the half-inserted state as in this configuration has the first positioning and holding at the initial position where the tip end of the push ring 7 abuts or approaches the rear side of the retaining protrusion 6e of the seal rubber 6 before the flexible tube 2 is inserted. If the positioning is held by the means, the first positioning and holding means alone or in combination with the holding action of the presser wheel in the half-inserted state by the separator according to claim 2, before insertion of the flexible tube 2, that is, in stock During storage, the seal rubber 6 is not likely to be pushed by the push wheel 7 in the half-inserted state, and the seal action portion 6c is held in the medium diameter hole 12 in a free state. Since internal stress does not occur and the sealing action portion 6c is elastically reduced in diameter only when the flexible tube 2 is inserted, it closely contacts the trough of the flexible tube 2. Is maintained for a long period of time, it is possible to ensure a predetermined useful life.
Further, the pusher wheel 7 that has been completely pushed in has its tip end abutted against or close to the rear side of the retaining protrusion 6e of the seal rubber 6 that has been pushed into the small-diameter hole 13 as the flexible tube 2 has been inserted. If the second positioning and holding means that is positioned and held at the pushing position is provided, it is possible to prevent the seal rubber 6 from moving in the inlet side direction after the insertion of the flexible tube 2 and the pushing of the push ring 7 is completed. The sealing state and the retaining state by 6 can be ensured, and the pull-out preventing force of the flexible tube 2 can be generated.

  As described in claim 5, the first positioning and holding means includes a first snap ring groove 23 provided on the inner periphery of the large-diameter hole 11 of the joint body 5 and a snap ring groove provided on the outer periphery of the push ring 7. It can consist of the snap ring 27 which engages detachably with 21. According to the first positioning / holding means, the presser wheel 7 in the half-inserted state has an initial position where the tip end of the presser wheel 7 abuts or approaches the rear side of the retaining protrusion 6e of the seal rubber 6 before the flexible tube 2 is inserted. It is possible to position and hold reliably.

  As described in claim 6, the flexible pipe joint according to claim 4 is provided as the second positioning and holding means on the inner side of the first snap ring groove 23 on the inner periphery of the large-diameter hole 11 of the joint body 5. The second snap ring groove 24 and the second snap ring groove 24 are moved from the first snap ring groove 23 to the second snap ring groove 24 by the pushing action of the snap ring groove 21 as the push ring 7 is pushed. A configuration in which the snap ring 27 is engaged with the ring groove 24 can be employed. According to this second positioning and holding means, the pusher wheel 7 that has been completely pushed in is located behind the retaining protrusion 6e of the seal rubber 6 whose tip is pushed into the small-diameter hole 13 as the flexible tube 2 is inserted. Positioned and held securely at the pushing position that is in contact with or close to the side.

  According to the present invention, a flexible tube can be inserted into a seal with a simple operation just by inserting a push ring, and the push wheel can be easily checked for push-in completion, preventing forgetting to push the push ring and insufficient push-in. There is.

  Preferred embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a half cutaway cross-sectional view showing a flexible pipe joint according to an embodiment of the present invention in a state before insertion of the flexible pipe, and FIG. 2 is a half cutout cross section of the flexible pipe joint shown in the state of being inserted into the flexible pipe. FIG. 3 is a half cutaway cross-sectional view of the flexible pipe joint shown in the middle of inserting the flexible pipe, FIG. 4 is a half cutaway cross sectional view of the flexible pipe joint shown in the state after completion of insertion of the flexible pipe, FIG. (A) is a half cutaway cross-sectional view of the seal rubber, (b) is a front view of the seal rubber, (c) is a rear view of the seal rubber, FIG. 6 is a side view seen from the direction of arrow A in FIG. It is a perspective view.

  As shown in FIG. 1, the joint 1 for flexible pipes which concerns on this invention forms the receiving part 3 which receives the front-end | tip part of the metal flexible pipe 2 in one end part, and has the external thread 4 for a connection in the outer periphery of the other end part. The formed joint body 5, the seal rubber 6 accommodated inside the receiving part 3 of the joint body 5, the push ring 7 inserted in a semi-inserted state leaving a pushing allowance in the receiving part 3, and the receiving part 3 and a spacer 28 for confirming pushing of the pusher wheel, which is mounted between the outer circumference of the pusher wheel 7 in the half-inserted state.

  As shown in FIG. 1, the flexible tube 2 is formed by alternately arranging ridges 8 and valleys 9 extending along the entire circumference in the outer circumferential part in the pipe axis direction, and the outer circumference is made of a synthetic resin such as vinyl chloride. Covered with layer 10.

  As shown in FIG. 1, a large-diameter hole 11, a medium-diameter hole 12, and a small-diameter hole 13 are formed in communication from the inlet side toward the inner back side in the receiving port 3 of the joint body 5. A stopper portion 14 projects radially inward from the inner back end of the small diameter hole 13. A first taper 15 is formed between the small diameter hole 13 and the medium diameter hole 12 so as to narrow toward the small diameter hole 13, and a second taper 16 is formed between the medium diameter hole 12 and the large diameter hole 11. It is formed in a narrowed shape toward the medium diameter hole 13.

As shown in FIGS. 5A to 5C, the seal rubber 6 includes a cylindrical front body 6a having an inner diameter substantially the same as the outer diameter of the crest 8 of the flexible tube 2, and the front body 6a. A pipe end receiving portion 6b projecting inwardly at the front end of the tube, an annular sealing action portion 6c projecting outward at the rear end portion of the front body portion 6a, and a front side connected to the rear side from the seal action portion 6c. A rear barrel 6d having an inner diameter larger than the inner diameter of the trunk 6a, and an inner diameter smaller than the inner diameter of the rear barrel 6d and larger than the outer diameter of the ridge 7 connected to the rear end of the rear barrel 6d. And it is integrally formed in the form which has the retaining protrusion 6e of the outer diameter larger than the outer diameter of the rear side trunk | drum 6d.
The front barrel portion 6a, the sealing action portion 6c, and the rear barrel portion 6d are made of NBR, SBR, EPDM, or the like. The tube end receiving portion 6b is formed of the same material or a different material as the front side barrel portion 6a, the sealing action portion 6c, the rear side barrel portion 6d, and the like, and examples of the different material include a refractory packing such as rubber containing thermally expandable graphite. is there.
The retaining protrusions 6e are formed in a partial arc shape with a metal material or hard resin harder than the front body part 6a, the sealing action part 6c, and the rear body part 6d, and a plurality of these are provided behind the rear body part 6d. The end portions are integrally molded at predetermined intervals in the circumferential direction. At the corner where the outer periphery of the retaining projection 6e intersects the rear end surface, a taper c having a rearward constriction is formed.

  As shown in FIG. 1, the seal rubber 6 has the tube end receiving portion 6b and the front body portion 6a positioned in the small diameter hole 13 and the sealing action portion 6c in the middle before the flexible tube 2 is inserted (initial state). While being located in the diameter hole 12, the retaining protrusion 6 e is accommodated and disposed so as to be located in the large diameter hole 11.

  As shown in FIG. 1, a tip latch member 17 is attached to the stopper portion 14 in the joint body 5. The tip latching member 17 has a C-shaped ring portion 17a that can freely expand and contract, and a resiliently deformable check claw 17b that protrudes from several locations on the inner diameter portion of the ring portion 17a. Etc. are formed. Then, the tip latching member 17 is engaged with the circumferential groove 14 a provided on the outer diameter side of the stopper portion 14 while the outer diameter portion of the ring portion 17 a is overlapped with the stopper portion 14. The pawl 17 b is attached to the stopper portion 14 so as to protrude into the small diameter hole 13.

  As shown in FIG. 1, the push wheel 7 has a cylindrical portion 7 a that is inserted in the axial direction so as to be movable in the axial direction of the large-diameter hole 11 of the joint body 5, and through which the flexible tube 2 can be inserted. A flange 7b having an outer diameter larger than the hole diameter of the large-diameter hole 11 is integrally formed on the outer periphery of the rear end portion on the inlet side, and a cutting blade 7c is provided on the end surface of the flange portion 7b on the cylindrical portion side so that the cutting edge faces the receiving portion. Provided. A packing groove 18 is formed on the inner periphery of the rear end on the inlet side of the cylindrical portion 7a of the push ring 7, and a waterproof packing 19 having a T-shaped cross section made of EPDM or the like is fitted into the packing groove 18. A tapered taper 20a having substantially the same gradient as the second taper 16 is formed on the outer periphery of the distal end portion of the cylindrical portion 7a, and a tapered taper 20b is formed on the inner periphery of the distal end portion of the cylindrical portion 7a.

As shown in FIG. 1, a snap ring groove 21 is formed on the outer periphery of the cylindrical portion 7 a of the push ring 7, while the inner periphery of the large-diameter hole 11 of the joint body 5 is selectively transmitted in order from the inlet side to the back side. A member groove 22, a first snap ring groove 23, and a second snap ring groove 24 are formed. In the first snap ring groove 23, a tapered taper 25 is formed toward the back side. The permselective member groove 22 is fitted with a permselective member 26 that allows gas to permeate from the inside to the outside but does not transmit solids or liquids.
The pusher wheel 7 is positioned and held in a half-insertion state (initial position) in which the front end of the pusher wheel abuts or approaches the rear side of the retaining protrusion 6e of the seal rubber 6 before the flexible tube 2 is inserted as shown in FIG. 1 and the positioning and holding means, and the front end part is in contact with or close to the rear side of the retaining protrusion 6e of the sealing rubber 6 pushed into the small diameter hole 13 as the flexible tube 2 is inserted as shown in FIG. A second positioning and holding means that is positioned and held at a proper pushing position.

  Before insertion of the flexible tube 2, as shown in FIG. 1, a snap ring (C-shaped retaining ring for a hole) 27 that can be expanded and contracted in the first snap ring groove 23 of the joint body 5 is connected to the large diameter hole 11. The first snap ring groove 23 and the snap ring groove 21 are fitted into the snap ring groove 21 of the press ring 7 so as to project from the inner peripheral surface of the push ring 7 so as to be detachably engageable. The snap ring 27 constitutes a first positioning and holding means, and the push wheel 7 in a half-inserted state by the positioning and holding means has a medium diameter hole in the seal rubber 6 before the flexible tube 2 is inserted as shown in FIG. 12 is positioned and held at an initial position that is in contact with or close to the rear side of the retaining protrusion 6e located in the interior 12.

  The second positioning and holding means includes a second snap ring groove 24 provided on the inner side of the inner periphery of the large-diameter hole 11 of the joint body 5 and a snap ring provided on the outer periphery of the push ring 7. It consists of a snap ring 27 detachably engaged with the groove 21.

  The spacer 28 for confirming the pushing-in of the pusher wheel is formed of synthetic resin, metal, or the like, and as shown in FIGS. 2, 6, and 7, a ring part 28a fitted on the cylindrical part 7a of the pusher wheel 7, and the ring part It is formed in a shape having a projecting piece 28b having an arc-shaped cross section projecting from a part of the outer periphery of 28a in the direction of the flange 7b, and a lip 28c attached to the inner periphery of the projecting side end of the projecting piece 28b. The ring portion 28a is externally fitted to the cylindrical portion 7a of the presser wheel 7 in the semi-inserted state and abuts against the inlet side end face 3a of the receiving port 3, and the lip 28c is the semi-inserted state of the presser wheel 7 in the semi-inserted state. It is engaged with a circumferential groove 29 provided on the outer periphery of the flange portion 7b so as to be detachable.

As shown in FIG. 1, the spacer 28 is externally fitted to the cylindrical portion 7a of the push ring 7 in which the ring portion 28a is in a semi-inserted state, contacts the inlet side end surface 3a of the receiving portion 3, and the lip 28c is in a semi-inserted state. In the state of engagement with the peripheral groove 29 on the outer periphery of the flange portion 7 b of the press ring 7, the tip end portion of the press ring 7 that is in a half-inserted state before the flexible tube 2 is inserted is positioned in the medium diameter hole 12 of the seal rubber 6. It coincides with the initial position (position held by the first positioning holding means) that contacts or approaches the rear side of the retaining protrusion 6e.
As the push ring 7 in the half-inserted state is pushed into the receiving portion 3 as shown in FIGS. 1 to 3, the lip 28 c of the spacer 28 moves from the circumferential groove 29 on the outer periphery of the flange portion 7 b of the push ring 7. It separates and slides on the outer peripheral surface of the flange portion 7b. Further, as shown in FIG. 4, the pusher wheel 7 is completely pushed to the pushing position where it comes into contact with or close to the rear side of the retaining protrusion 6 e of the sealing rubber 6 pushed into the small-diameter hole 13. Then, the cutting blade 7c of the push ring 7 cuts a part 30 of the spacer 28, in the illustrated example, at a position where the ring portion 28a is connected to the projecting piece 28b or in the vicinity thereof, so that the projecting piece 28b becomes the receiving part 3 and the press wheel Deviate from 7. It is desirable that the portion to be cut 30 of the spacer 28 is previously formed thin so that it can be easily cut by the cutting blade 7c.
In this way, the state in which the push wheel 7 is completely pushed in, the part 30 of the spacer 28 is cut, and the protruding piece 28b is detached from the receiving portion 3 and the push wheel 7 is held by the second positioning and holding means. It coincides with the pushing position of the push wheel 7.

  Next, a procedure for connecting the flexible pipe 2 to the flexible pipe joint 1 will be described with reference to FIGS.

  As shown in FIG. 1, before connection of the flexible tube 2 and before insertion of the flexible tube 2, that is, during inventory and storage, the ring portion 28a of the spacer 28 is brought into contact with the inlet side end surface 3a of the receiving portion 3, The holding action in the half-insertion state of the pusher wheel 7 obtained by engaging the circumferential groove 29 provided on the outer periphery of the flange portion 7b of the pusher wheel 7 in the half-insertion state, and the first positioning holding means Combined with the holding action of the push ring 7 in the half-inserted state, the push ring 7 can be prevented from being inadvertently pushed and deformed to the seal rubber 6.

  When connecting the flexible pipe 2, first, as shown in FIG. 2, the flexible pipe 2 from which the synthetic resin layer 10 is peeled and about six ridges 8 are exposed is received by the joint body 5 from the inlet side of the presser wheel 7. The sealing protrusion 6e of the seal rubber 6 in the mouth 3 is inserted in the order of the rear barrel portion 6d, the seal action portion 6c, and the front barrel portion 6a, and the distal end portion of the flexible tube 2 is inserted into the tube end receiving portion 6b of the seal rubber 6. Abut. At that time, since the sealing action portion 6c of the seal rubber 6 is formed so as to protrude outward, the distal end portion of the flexible pipe 2 is not disturbed when the flexible pipe 2 is inserted. It can be smoothly inserted into the seal rubber 6.

  Subsequently, as shown in FIG. 3, when the flexible tube 2 is inserted to a predetermined depth, the seal rubber 6 is pushed into the interior of the receiving portion together with the flexible tube 2, and the sealing action portion 6c of the seal rubber 6 is moved to the first position along with this pushing. As soon as the first taper 15 is slidably contacted with the first taper 15, it is pressed by the first taper 15 and deformed inwardly, and as soon as it passes through the first tapered surface 15 and moves into the small-diameter hole 13, the flexible tube 2. By being in close contact with both the slope 9a and the valley bottom 9b of the trough 9 or at least the slope 9a in a compressive manner, the retaining projection 6e of the seal rubber 6 is in sliding contact with the constricted side of the second taper 16 at the same time. The second taper 16 moves into the medium diameter hole 12 while being pressed in the direction of diameter reduction, and is pushed into the valley part 9 different from the valley part 9 of the flexible pipe 2 on the inner peripheral surface of the medium diameter hole 12 to be fitted. To do. Thereby, the space between the outer peripheral surface of the distal end portion of the flexible tube 2 and the inner peripheral surface of the small diameter hole 11 of the joint body 5 is surely sealed and sealed by the seal rubber 6, and the fluid flowing in the flexible tube 2 flows. From this, it is possible to prevent leakage from passing between the outer periphery of the distal end portion of the flexible tube 2 and the inner periphery of the small-diameter hole 11 of the joint body 5, and the retaining projection 6e provides a retaining state of the flexible tube 2. It is done. A sealing function can also be expected between the tip of the flexible tube 2 and the tube end receiving portion 6b of the seal rubber 6.

When the flexible tube 2 is inserted to a predetermined depth as shown in FIG. 3, the inner diameter portion of the tube end receiving portion 6 b of the seal rubber 6 and the inner surface of the distal end portion of the flexible tube 2 are the check claws 17 b of the distal end latching member 17. And the inner peripheral surface of the small-diameter hole 11 are engaged with the check claw 17b after passing through the elastic claw deformation of the check claw 17b. When this pipe end receiving portion 6b passes through the check claw 17b, the installer feels responsive and can feel that the flexible pipe 2 has been inserted to a predetermined depth.
Moreover, while the front-end | tip part of the flexible pipe | tube 2 engages with the non-return claw 17b of the front-end | tip latching member 17, the flexible protrusion 2 suppresses that the flexible pipe | tube 2 shake | fluctuates by entering into the trough part 9e. can do.

  After the insertion of the flexible tube 2 is completed, the push ring 7 is completely pushed in as shown in FIG. When the pusher wheel 7 is completely pushed, the tip of the pusher wheel 7 approaches or comes into contact with the rear side of the retaining protrusion 6e of the seal rubber 6 to prevent the seal rubber 6 from moving back toward the inlet side of the receiving part 3. Thus, it is possible to secure a sealing state and a retaining state by the seal rubber 6 and to generate a pull-out preventing force of the flexible tube 2.

  Further, as the push ring 7 is completely pushed, the taper 20 b at the tip end of the push ring 7 comes close to and opposes the taper c of the retaining protrusion 6 e of the seal rubber 6. Therefore, even if an external force is applied in the direction in which the flexible tube 2 is pulled out at this time, the taper c of the retaining projection 6e that accompanies the flexible tube 2 abuts against the constricted side of the taper 20b of the push ring 7, thereby preventing the retaining. Since the protrusion 6e is reduced in diameter through the elasticity of the rear body 6d and the inner diameter of the retaining protrusion 6e increases the engagement force with the valley 9 of the flexible tube 2, the flexible tube 2 is surely pulled out. To be blocked.

  When the press ring 7 is completely pushed, a part 30 of the spacer 28 is cut by the cutting blade 7c of the press ring 7 so that the overhanging piece 28b is detached from the receiving portion 3 and the push ring 7, and the overhanging piece 28b is detached. , It can be easily confirmed that the push wheel 7 has been completely pushed. Therefore, it is possible to prevent the seal rubber 6 from moving back toward the inlet side of the receiving port 3 due to forgetting to push the push ring 7 or insufficient push and causing fluid leakage or the flexible tube 2 from coming out.

  In the above embodiment, the joint portion for the male threaded flexible pipe in which the receiving port 3 is formed at one end of the joint body 5 and the male thread for connection 4 is formed at the outer periphery of the other end is described, but the present invention is not limited thereto, and other structures, For example, the present invention can be applied to symmetrical socket-type flexible pipe joints having receiving portions at both ends, elbow-type flexible pipe joints, and the like.

It is a half notched cross-sectional view showing the joint for flexible pipe showing an embodiment of the present invention in a state before insertion of the flexible pipe. It is a half notched cross-sectional view of the joint for flexible pipes shown in the state during insertion of the flexible pipes. It is a half notched cross-sectional view of the joint for flexible pipes shown in the state during insertion of the flexible pipes. It is a half notched cross-sectional view of the joint for flexible pipes shown in a state after completion of insertion of the flexible pipes. (A) is a half cutaway cross-sectional view of the seal rubber, (b) is a front view of the seal rubber, and (c) is a rear view of the seal rubber. It is the side view seen from the arrow A direction in FIG. It is a perspective view of a separator. (A) is sectional drawing which shows the joint for flexible pipes of a prior art example in the state in the middle of flexible pipe insertion, (B) is sectional drawing which shows the joint for flexible pipes in the state after completion of flexible pipe insertion.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Joint for flexible pipes 2 Flexible pipe 3 Receiving part 5 Joint main body 6 Seal rubber 6a Front side trunk | drum 6b Pipe end receiving part 6c Sealing action part 6d Rear side trunk | drum 6e Detach | projection protrusion 7 Push ring 7a Cylindrical part 7b Ridge part 7c Cutting blade 8 Crest 9 Valley 9a Slope 11 Large-diameter hole 12 Medium-diameter hole 13 Small-diameter hole 15 First taper 16 Second taper 21 Push ring snap ring groove 23 First snap ring groove 24 Second snap ring groove 27 Snap ring 28 Spacer 28a Ring part 28b Overhang piece 28c Lip 29 Circumferential groove

Claims (6)

A joint body having a receiving portion into which a distal end portion of a flexible pipe is alternately arranged in the pipe axis direction with crests and troughs extending in the circumferential direction all around the outer periphery, and accommodated in the receiving portion A seal rubber that seals between the inner periphery of the receiving portion and the outer periphery in the vicinity of the distal end portion of the flexible tube, and a push ring that is inserted into the receiving portion. The push ring includes a cylindrical portion and the cylindrical portion. When the cylindrical portion is inserted into a semi-insertion state that leaves a pushing allowance in the receiving portion, and is completely pushed in by the pushing allowance. In the joint for flexible pipe, the seal rubber is prevented from moving back and moving toward the inlet side of the receiving port at the tip of the cylindrical portion.
A cutting blade is provided on an end surface of the collar portion of the pusher wheel on the cylindrical portion side, and a spacer for confirming pushing of the pusher wheel is mounted between the receiving part and the pusher wheel in the half-inserted state, and the pusher wheel in the half-inserted state The flexible pipe joint is configured such that when the spacer is completely pushed, a part of the spacer is cut by the cutting blade and detached from the receiving portion and the push ring.   The spacer includes a ring portion that is externally fitted to the cylindrical portion of the press ring, a projecting piece having an arc-shaped cross section projecting from a part of the outer periphery of the ring portion toward the flange portion, and a projecting side of the projecting piece An outer periphery of the pusher wheel that is formed in a shape having a lip attached to the inner periphery of the end portion, the ring portion is in contact with the end surface on the inlet side of the receiving portion, and the lip is in a half-inserted state The joint for flexible pipes according to claim 1, wherein the joint is detachably engaged with a circumferential groove provided in the pipe. A large-diameter hole, a medium-diameter hole, and a small-diameter hole are formed in order from the inlet side toward the inner back side in the receiving portion.
The sealing rubber has a cylindrical front barrel having an inner diameter substantially the same as the outer diameter of the ridge of the flexible tube, a pipe end receiving portion projecting inwardly to the front end of the front barrel, and the front barrel An annular sealing portion projecting outward from the rear end portion of the rear portion, a rear trunk portion having an inner diameter larger than the inner diameter of the front barrel portion, which is connected to the rear from the sealing action portion, and a rear portion of the rear barrel portion. And a retaining protrusion having an inner diameter that is continuous with the end and has an inner diameter that is smaller than the inner diameter of the rear trunk and larger than the outer diameter of the peak and larger than the outer diameter of the rear trunk. Has been
A first taper is formed between the small diameter hole and the medium diameter hole so as to be narrowed toward the small diameter hole, and a second taper is formed between the medium diameter hole and the large diameter hole toward the medium diameter hole. It is formed in a ball shape,
When the seal rubber is in a free state, the pipe end receiving portion and the front body portion are located in the small diameter hole, and the sealing action portion is located in the medium diameter hole, and the retaining protrusion is the large diameter hole. It is housed and arranged to be located inside,
As the distal end portion of the flexible tube is inserted into the receiving portion from the push ring in a half-inserted state, the distal end portion of the flexible tube is inserted into the seal rubber and comes into contact with the tube end receiving portion to thereby remove the seal rubber. Pushing inward in the receiving part, and with this pushing, the sealing action part is reduced in diameter by sliding on the narrowed side of the first taper and closely contacts at least the slope of the valley of the flexible pipe, The anti-protrusion protrusion is configured to reduce the diameter by sliding the outer diameter portion thereof toward the constriction side of the second taper and to fit the inner diameter portion into the valley portion of the flexible pipe. Or the coupling for flexible pipes of 2.   The push wheel in the half-inserted state has a first positioning and holding means in which the tip end portion thereof is positioned and held at an initial position in contact with or close to the rear side of the sealing protrusion of the seal rubber before the flexible tube is inserted; The pusher wheel pushed in is positioned at a pushing position where the tip of the pusher wheel comes into contact with or closes to the rear side of the seal rubber retaining protrusion pushed into the small-diameter hole when the flexible tube is inserted. The joint for flexible pipes according to claim 3 provided with the 2nd positioning holding means held.   The first positioning and holding means is a snap ring that is detachably engaged with a first snap ring groove provided on the inner periphery of the large-diameter hole of the joint body and a snap ring groove provided on the outer periphery of the push ring. The joint for flexible pipes of Claim 4 which consists of these.   The second positioning and holding means includes a second snap ring groove provided on the inner side of the large-diameter hole of the joint main body on the inner side of the first snap ring groove, and the snap ring groove as the push ring is pushed in. The flexible pipe according to claim 4, comprising the snap ring that is transferred from the first snap ring groove to the second snap ring groove by a pushing action and engages with the snap ring groove and the second snap ring groove. Fittings.

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