JP5380587B2 - Fitting for flexible pipe - Google Patents

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 an insertion type flexible pipe joint of this type, for example, as shown in FIGS. 6A and 6B, a joint body 42 having a pipe insertion hole 41 for inserting a bellows-like flexible pipe 40, A retainer member 44 having a rear protrusion 44a inserted into the annular recess 43 on the outer surface of the flexible tube 40 and the rear protrusion 44a of the retainer member 44 disposed in the tube insertion hole 41 is inserted into the annular recess 43 on the outer surface of the flexible tube 40. And a packing member 46 that seals between the flexible tube 40 and the joint main body 42, and the presser wheel 45 is disposed in the pipe insertion hole 41 of the joint main body 42. A position where the rear projection 44a of the retainer member 44 is fitted in the annular recess 43 of the flexible tube 40, and the retainer portion. The rear projection 44a of the material 44 can be displaced between the position where the rear projection 44a of the material 44 does not fit into the annular recess 43 of the flexible tube 40, and the rear projection 44a of the retainer member 44 can be moved to the annular recess 43 of the flexible tube 40. Locking means for locking at a position for holding the fitted state is provided.

  As the locking means, a first groove (stop ring accommodating recess) 48 and a second groove (stop ring holding step) 49 are formed in the joint main body 42 so that the outer periphery of the stop ring member 47 engages. While the inner peripheral portion of the C-shaped stop ring member 47 is engaged with the groove portion 50 formed on the outer peripheral surface on the proximal end side of the press wheel 45, the outer peripheral portion of the stop ring member 47 is changed according to the slide of the press wheel 45. When the gap between the first groove 48 and the second groove 49 is displaceable and the outer peripheral portion of the stop ring member 47 is engaged with the first groove 48, the pusher 45 has the rear protrusion 44 a of the retainer member 44 and the flexible tube 40. The pusher wheel 45 is temporarily fixed to the joint body 42 at a position where it does not fit into the annular recess 43, and when the outer periphery of the stop ring member 47 engages with the second groove 49, the pusher wheel 45 is Retail Rear projection 44a of the member 44 is locked and held in a state that fits into the annular recess 43 of the flexible tube 40, there is that (for example, see Patent Document 1.). Incidentally, the stroke length S (see FIG. 6A), which is the pushing amount of the push wheel 45, is set to be substantially the same as the distance between the first groove 48 and the second groove 49.

  According to this flexible pipe joint, it is possible to connect the flexible pipe 40 while maintaining good sealing performance by simply pushing the push wheel 45.

JP 2003-176888 A

  However, in the joint for flexible pipes provided with the locking means, the groove portion 50 is formed on the outer peripheral surface on the proximal end side of the presser wheel 45, the inner peripheral portion of the stop ring member 47 is engaged with the groove portion 50, and the joint main body 42 is engaged. The first groove 48 and the second groove 49 that are engaged with the outer peripheral portion of the stop ring member 47 are formed, and the inner periphery of the stop ring member 47 is engaged with the groove portion 50 of the press wheel 45 so that the press wheel 45 can slide. Accordingly, since the outer periphery of the stop ring member 47 is displaceable between the first groove 48 and the second groove 49, the joint body 42 moves the stop ring member 47 from the first groove 48 to the second groove 49. It is necessary to ensure the length to be obtained, and the axial length of the joint body 42 is increased accordingly. Therefore, there existed a problem that the whole coupling became large sized and cost became high.

  The present invention has been made to solve such problems, and the object of the present invention is to connect the flexible tube in a seal shape by a one-touch operation of inserting the flexible tube and pushing the push wheel. In addition, the seal rubber can be prevented from being deformed by being pushed by the push ring in the half-inserted state before insertion of the flexible pipe, that is, in stock and storage, and after the flexible pipe has been inserted and the push ring has been pushed in, the seal rubber moves toward the inlet side. An object of the present invention is to provide a joint for flexible pipes that can prevent movement and can secure a sealing state by a seal rubber, and that can suppress the length of the joint body in the axial direction and make the entire joint as small as possible.

  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 near the tip of the flexible tube 2 inserted into the receiving portion 3, and a push ring 7 that is inserted into the receiving portion 3. 7 is inserted in a semi-insertion state in which the push-in allowance remains in the receiving part 3, and when the push-in part is completely pushed in, the seal rubber 6 moves back toward the inlet side of the push-receiving part 3 at the tip of the push ring 7. In the joint for flexible pipes, which is designed to suppress the pressing, the pusher wheel 7 in the half-inserted state has a tip portion thereof. First positioning and holding means that is positioned and held at an initial position that is in contact with or close to the rear side of the seal rubber 6 before the rexible tube 2 is inserted, and the push wheel 7 that is completely pushed in, the tip of the first is flexible. And a second positioning and holding means that is positioned and held at a pushing position that is in contact with or close to the rear side of the seal rubber 6 that is pushed in as the tube 2 is inserted. The first positioning and holding means includes a receiving portion. 3, a spacer 29 detachably attached to an annular spacer groove 28 provided on the outer periphery of the push wheel 7 in a half-insertion state exposed on the inlet side of 3, a snap ring receiving groove 23 provided on the inner periphery of the receiving portion 3, A snap ring 27 having an outer peripheral portion fitted into the snap ring receiving groove 23 and an outer periphery of the push ring 7 are arranged in front of the spacer groove 28, and are provided on the inner peripheral portion of the snap ring 27. The rear groove wall in the snap ring holding groove 21 is formed with a tapered surface 21a that gradually widens rearward, and the second positioning holding means is a spacer. 29 is removed from the spacer groove 28, and the pusher wheel 7 is pushed in as much as the pushing amount, so that the spacer groove 28 is engaged with the inner peripheral portion of the snap ring 27, and the seal rubber 6 has a pipe end receiving portion 6b. The distal end of the flexible tube 2 is inserted into the seal rubber 6 as the distal end of the flexible tube 2 is inserted into the receiving port 3 from the push ring 7 in a semi-inserted state. The seal rubber 6 is pushed inwardly in the receiving portion by contacting with 6b.

  According to the flexible pipe joint having the above-described configuration, after the flexible pipe 2 is inserted, the seal rubber 6 moves back toward the inlet side of the receiving portion 3 at the tip of the push ring 7 when the push ring 7 is completely pushed by the pushing allowance. Therefore, a sealing function between the vicinity of the distal end portion of the flexible tube 2 and the inner periphery of the receiving port portion 3 by the seal rubber 6 can be secured.

Since the first positioning and holding means holds the press ring 7 in a half-inserted state, the push ring 7 is prevented from being inadvertently pushed and deformed to the seal rubber 6 before the flexible tube 2 is inserted, that is, during inventory and storage. it can.
The second positioning and holding means prevents the seal rubber 6 from moving in the inlet side direction after the flexible tube 2 is inserted and the push wheel 7 is pushed in, so that the sealing state and the retaining state by the seal rubber 6 can be secured.

  As the first and second positioning and holding means, a snap ring receiving groove 23 is provided on the inner periphery of the receiving portion 3 of the joint body 5, and the outer peripheral portion of the snap ring 27 is fitted and received in the snap ring receiving groove 23. 7 is provided with a spacer groove 28 for attaching the spacer 29 and a snap ring holding groove 21. When the presser wheel 7 is in a half-inserted state, the inner peripheral portion of the snap ring 27 engages with the snap ring holding groove 21. When 29 is removed from the spacer groove 28 and the presser wheel 7 is completely pushed in, the spacer groove 28 is engaged with the inner periphery of the snap ring 27, that is, the joint body 5 has the snap ring 27. Since only the snap ring housing groove 23 for housing the outer peripheral portion is provided, the outer peripheral portion of the stop ring member 47 is formed in the joint main body 42 as in the conventional case. The axial length of the joint body 5 is shorter than that in which the first groove 48 and the second groove 49 to be engaged are formed, and the stop ring member 47 is formed in the first groove 48 in the joint body 42 as in the prior art. Therefore, it is not necessary to secure a length that can be moved from the first to the second groove 49, and an increase in size of the joint can be suppressed.

The joint for a flexible pipe according to claim 1 has a large-diameter hole 11, an intermediate-diameter hole 12, and a small-diameter hole 13 formed in order from the inlet side to the inner back side in the receiving portion 3, and the seal rubber 6 is It has a cylindrical front barrel portion 6a having an inner diameter substantially the same as the outer diameter of the crest portion 8 of the flexible tube 2, and the tube end receiving portion 6b projects inwardly to the front end portion of the front barrel portion 6a. In addition to the front barrel portion 6a and the pipe end receiving portion 6b, the seal rubber 6 has an annular seal action portion 6c projecting outward from the rear end portion of the front barrel portion 6a, and the seal action portion 6c. A rear barrel 6d having an inner diameter larger than the inner diameter of the front barrel 6a and a rear end of the rear barrel 6d, which is smaller than the inner diameter of the rear barrel 6d and larger than the outer diameter of the mountain portion 8. Integrated into a shape having a retaining protrusion 6e having an inner diameter and an outer diameter larger than the outer diameter of the rear body 6d. A first taper 15 is formed between the small diameter hole 13 and the medium diameter hole 12 so as to be narrowed toward the small diameter hole 13, and a second taper is formed between the medium diameter hole 12 and the large diameter hole 11. The taper 16 is formed in a constricted shape toward the medium-diameter hole 12, and the seal rubber 6 has a tube end receiving portion 6b and a front body portion 6a located in the small-diameter hole 13 in a free state, and a sealing action portion 6c. In addition to being located in the medium diameter hole 12, the retaining protrusion 6 e is accommodated and disposed so as to be located in the large diameter hole 11, and half inserted as the distal end of the flexible tube 2 is inserted into the receiving part 3. The distal end portion of the flexible tube 2 is inserted into the seal rubber 6 from the push ring 7 in the state, contacts the tube end receiving portion 6b, and the seal rubber 6 is pushed inwardly in the receiving portion. Reduced diameter by sliding on the narrow side of the first taper 15 And is in close contact with at least the inclined surface 9a of the valley portion 9 of the flexible tube 2, 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, thereby reducing the inner diameter portion. May be configured to fit into the valley 9 of the flexible tube 2.
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 13 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, the distal end portion inserted into the receiving portion 3 of the flexible tube 2 and the deformation of the vicinity of the distal end portion and the influence on bending after construction, etc. It becomes hard to receive and can improve sealing performance.
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. In accordance with the pushing, the sealing action portion 6c is slidably contacted with the first taper side of the first taper so as to be reduced in diameter and 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, when the distal end part of the flexible pipe 2 is inserted, the distal end part is supported by the sealing action part 6c and 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.

The pusher wheel 7 in the half-inserted state is positioned and held by the first positioning and holding means at an initial position where the tip of the presser wheel abuts or approaches the rear side of the retaining protrusion 6e of the seal rubber 6 before the flexible tube 2 is inserted. When the flexible tube 2 is inserted, that is, at the time of inventory and storage, the seal rubber 6 is not likely to be pushed by the pusher wheel 7 in the half-inserted state, and the sealing action portion 6c is held in the medium diameter hole 12 in a free state. As a result, no internal stress is generated in the sealing portion 6c, and the sealing portion 6c is elastically reduced in diameter only when the flexible tube 2 is inserted into the valley portion of the flexible tube 2. Since it adheres, an appropriate compression allowance is maintained over a long period of time, and a predetermined service life can be guaranteed.
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.

  According to the present invention, the flexible tube can be connected in a seal shape by simply inserting the push ring and the seal rubber is pushed by the push ring in a half-inserted state before insertion of the flexible tube, that is, in stock or storage. It is possible to prevent deformation, and after the insertion of the flexible tube and the push ring is completed, the seal rubber can be prevented from moving in the inlet side direction, and a sealing state by the seal rubber can be ensured. In particular, it is not necessary to secure a length that enables the stop ring member to be moved from the first groove to the second groove in the joint body as in the conventional case, and the axial length of the joint body is short, which increases the size of the joint. There is an advantage that it can be suppressed.

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 a state after completion of insertion of the flexible pipes. It is an enlarged view of the A section in FIG. (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. (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.

  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 cross-sectional view of the joint of the flexible pipe shown in a state after completion of insertion of the flexible pipe, FIG. 4 is an enlarged view of a portion A in FIG. 1, and FIG. FIG. 4B is a front view of the seal rubber, and FIG. 3C is a rear view of the seal rubber.

  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. A formed joint body 5, a seal rubber 6 accommodated inside the receiving portion 3 of the joint body 5, and a push ring 7 inserted in a semi-inserted state leaving a pushing allowance in the receiving portion 3 are provided.

  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 FIGS. 1 and 4, a large-diameter hole 11, a medium-diameter hole 12, and a small-diameter hole 13 are formed in the receiving portion 3 of the joint body 5 in order from the inlet side to the inner back side in a continuous manner. . 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 tube end receiving portion 6b projecting inwardly at the front end portion 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 portion 7b having an outer diameter larger than that of the large-diameter hole 11 is integrally formed on the outer periphery of the inlet-side rear end portion. A packing groove 18 is formed in the circumferential direction 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 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 holding groove 21 having a rectangular cross section is formed in the circumferential direction on the outer periphery of the cylindrical portion 7 a of the push wheel 7, while the inner periphery of the large-diameter hole 11 of the joint body 5 is formed from the inlet side. A selective transmission member groove 22 and a snap ring receiving groove 23 having a rectangular cross section are formed in the circumferential direction in order toward the back side. The rear groove wall in the snap ring holding groove 21 is formed with a tapered surface 21a that gradually expands rearward. The permselective member groove 22 is fitted with a permselective member 26 that transmits gas 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 tip end part is in contact with or close to the rear side of the retaining protrusion 6e of the seal rubber 6 that is pushed into the small diameter hole 13 as the flexible pipe 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 FIGS. 1 and 4, the snap ring receiving groove 23 of the joint body 5 has an outer peripheral portion of a snap ring 27 having a C-shaped retaining ring for holes and the like that can be expanded and contracted. The inner periphery of the snap ring 27 protrudes from the inner peripheral surface of the large-diameter hole 11 and is detachably engaged with the snap ring holding groove 21 of the push wheel 7. The snap ring 27 is housed in the snap ring housing groove 23 so that the diameter can be increased.

  In the first positioning and holding means, an annular spacer groove 28 is provided in the circumferential direction in the axially intermediate portion of the outer periphery of the cylindrical portion 7a of the push ring 7 exposed from the inlet end of the joint body 5, and the spacer groove 28 is formed in a C shape. The spacer 29 is detachably fitted so as to be in contact with the opening end face of the receiving portion 3. The spacer groove 28 and the spacer 29, the snap ring receiving groove 23, and the snap ring receiving groove 23 It is constituted by a snap ring 27 in which a portion is fitted and accommodated, and a snap ring holding groove 21. By this first positioning and holding means, as shown in FIGS. 1 and 4, the tip of the pusher wheel 7 in the half-inserted state is positioned in the medium diameter hole 12 of the seal rubber 6 before the flexible tube 2 is inserted. It is positioned and held at an initial position in contact with or close to the rear side of the retaining protrusion 6e. In other words, the push wheel 7 in the half-inserted state is prevented from being pushed by the spacer 29 at the initial position, and is prevented from moving in the extraction direction by the engagement between the inner peripheral portion of the snap ring 27 and the snap ring holding groove 21. Be blocked. The pusher wheel 7 is prevented from being pushed inadvertently by the first positioning and holding means from the half-inserted state in the initial state, so that the seal rubber 6 is not pushed inadvertently.

  In the second positioning and holding means, when the spacer 29 is removed from the spacer groove 28 and the push ring 7 is pushed by the pushing amount, the spacer groove 28 is engaged with the inner peripheral portion of the snap ring 27 as shown in FIG. It is configured. The stroke length S (see FIG. 2), which is the pushing allowance of the press wheel 7, is set to be substantially the same as the distance between the snap ring holding groove 21 and the spacer groove 28.

  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 spacer 29 is fitted into the spacer groove 28 of the push ring 7 and is accommodated in the snap ring accommodating groove 23. By the first positioning and holding means in which the inner peripheral portion of the snap ring 27 is engaged with the snap ring holding groove 21 of the press ring 7, the half-inserted press ring 7 is inadvertently pushed and deforms the seal rubber 6. Can be prevented.

  When connecting the flexible pipe 2, first, as shown in FIG. 2, the spacer 29 is removed from the spacer groove 28, the synthetic resin layer 10 is peeled off, and the flexible pipe 2 having about six peaks 8 is exposed. 7 is inserted in the order of the retaining protrusion 6e of the seal rubber 6 in the receiving portion 3 of the joint body 5, the rear barrel portion 6d, the sealing action portion 6c, and the front barrel portion 6a from the inlet side of the joint body 5, and the tip of the flexible tube 2 The portion is brought into contact with the tube end receiving portion 6 b of the seal rubber 6. 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, when the flexible tube 2 is inserted to a predetermined depth as shown in FIG. 3, the seal rubber 6 is pushed into the receiving portion in the inner direction along with the flexible tube 2, and the seal action portion 6 c of the seal rubber 6 is first tapered along with this pushing. 15 is pressed by the first taper 15 by sliding in contact with the narrowed side of 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 valley of the flexible tube 2. When the slope 9a and the valley bottom 9b of the portion 9 are compressed in close contact with at least the slope 9a, and at the same time, the retaining protrusion 6e of the seal rubber 6 is in sliding contact with the constriction side of the second taper 16, thereby The taper 16 moves to the medium diameter hole 12 while being pressed in the diameter reducing direction, and is pushed into and inserted 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. As a result, 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 13 of the joint body 5 is reliably 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 13 of the joint body 5, and the retaining state of the flexible tube 2 is obtained by the retaining protrusion 6e. 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 periphery of the small-diameter hole 13 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 by the pushing allowance as shown in FIG. Along with this pushing, the diameter of the snap ring 27 elastically expands while slidingly contacting the tapered surface 21a of the snap ring holding groove 21 of the push ring 7 in a state where the outer peripheral portion is fitted and accommodated in the snap ring receiving groove 23. Diameter. When the pusher wheel 7 is completely pushed in, the spacer groove 28 of the pusher wheel 7 reaches the inner peripheral part of the expanded snap ring 27, and the snap ring 27 is reduced in diameter by an elastic restoring action, thereby reducing the inner peripheral part. The second positioning and holding means for engaging with the spacer groove 28 acts. As a result, the pusher wheel 7 is held at a complete pushing position where the tip of the pusher wheel is close to or in contact with the rear side of the retaining protrusion 6e of the seal rubber 6, so that the seal rubber 6 returns toward the inlet side of the receiving part 3. It can be prevented from moving. Therefore, a sealing state and a retaining state by the seal rubber 6 can be ensured, and a pull-out preventing force for the flexible tube 2 can be generated.

  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.

  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.

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 Depression protrusion 7 Push ring 8 Crest part 9 Valley part 9a Slope 11 Large diameter hole 12 Medium diameter hole 13 Small diameter hole 15 1st taper 16 2nd taper 21 Snap ring holding groove 21a Tapered surface 23 Snap ring receiving groove 27 Snap ring 28 Spacer groove 29 Spacer

Claims (1)

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 sealing rubber that seals between the inner periphery of the receiving portion and the outer periphery of the flexible tube that is inserted into the receiving portion, and a push ring that is inserted into the receiving portion, The pusher wheel is inserted in a semi-insertion state that leaves a pushing allowance in the receiving part, and when the pushing wheel is completely pushed in by the pushing allowance, the seal rubber moves back toward the inlet side of the receiving part at the tip of the pushing wheel. In a flexible pipe joint that is designed to suppress
The push wheel in the half-inserted state has a first positioning holding means that is positioned and held at an initial position in which a tip portion thereof abuts or approaches the rear side of the seal rubber before the flexible pipe is inserted, The pusher wheel includes second positioning and holding means whose tip is positioned and held at a pushing position in contact with or close to the rear side of the seal rubber pushed in with the insertion of the flexible tube.
The first positioning and holding means includes a spacer detachably mounted in an annular spacer groove provided on an outer periphery of the push ring in a semi-insertion state exposed on the inlet side of the receiving portion, and an inner periphery of the receiving portion. A snap ring receiving groove provided in the outer ring, a snap ring having an outer peripheral portion fitted in the snap ring receiving groove, and an outer periphery of the push ring arranged in front of the spacer groove and engaged with an inner peripheral portion of the snap ring. A snap ring holding groove, and a rear groove wall in the snap ring holding groove is formed with a taper surface gradually expanding toward the rear,
The second positioning and holding means is configured such that when the spacer is removed from the spacer groove and the pusher wheel is pushed in by the pushing amount, the spacer groove is engaged with the inner peripheral portion of the snap ring. ,
The seal rubber is formed into a shape having a tube end receiving portion;
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. A flexible pipe joint that is pushed inward in the receiving part.

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