JP5371811B2 - Flexible pipe connection fitting - Google Patents

Description

  In the present invention, when a flexible pipe such as a polyethylene pipe is used as a water pipe, an air-conditioning pipe, etc., when the connection pipe inserted into the pipe insertion portion is tightened to the pipe insertion core cylinder with the cap nut via the tightening ring. In connection with flexible pipe connection joints that prevent the connection pipe from sliding on the outer surface of the tube insertion core cylinder and rotating together with the rotation of the cap nut, and securely tightening the connection pipe to the core cylinder It is.

  Conventionally, as a connection joint of a flexible tube, a connection pipe is inserted into a tube insertion portion 4 configured between a tube insertion core cylinder 2 and one of the tube insertion portion outer frames 3 surrounding the tube insertion core tube 2 at one end of the trunk portion 1. A structure in which the inserted connecting pipe is fastened to the pipe insertion core cylinder by the cap nut 6 via the fastening ring 7 has been used.

  The connection pipe A is tightened with respect to the tube insertion core tube as the cap nut is screwed with the male screw portion 31 engraved on the outer periphery of the tube insertion portion outer frame 3 surrounding the core tube and propelled to the base side. The inner diameter of the rear end restricting portion 63 of the cap nut is formed by constricting the outer surface taper surface 72 of the tightening ring 7 interposed between the inner wall of the barrel male screw portion and the core tube 2.

  However, when the taper contact surface portion 62 of the cap nut 6 tightens and rotates the cap nut side male taper surface 73 on the outer surface of the tightening ring 7, the connection pipe A gripped by the tightening ring 7 by rotational friction is the cap nut. There is a problem of rotating with the rotation, and the male taper surface 72 on the tube insertion portion side of the tightening ring 7 slides on the female taper surface 62 of the inner diameter of the cap nut 6 to rotate the tightening ring 7 with the connecting tube. This causes a situation in which the outer surface of the tube insertion core tube 2 slides and rotates together, causing a hindrance to the tightening operation of the connecting tube.

For preventing joint rotation with respect to the tightening of the connecting pipe, as described in Patent Document 1, a male and female engaging portion for preventing the sliding of both members is provided on the inner periphery on the tightening side of the joint tube tightening portion and the outer periphery on the side receiving the tightening. In addition, as described in Patent Document 2, an inner peripheral surface of the outer frame of the tube insertion portion and an outer peripheral surface that is in contact with the inner peripheral surface are proposed as a non-slip surface that allows the fine-grained material to adhere and the cast ground to remain.
Japanese Utility Model Publication No. 63-187792 JP 2000-291852 A

  However, in order to prevent the joint rotation of both members, it is necessary to perform the processing that affects the specifications of both members in order to provide both male and female engaging portions. It is inevitable that rattling will occur.

  Further, the method of forming the anti-slip surface on the contact surfaces of both members has a problem that the anti-slip effect varies due to an error in the thickness of the tube, and when the hardness of the bonded tube increases, the bonded tube becomes flexible and becomes thick. Unlike the case where there is elasticity, there is a problem that it is necessary to cope with strengthening of the retaining durability against the joint pipe and water leakage.

  In other words, in the conventional flexible pipe connection joints, the joint body locks the joint pipe against the outer surface of the joint pipe by the cap nut and the fastening ring, and the gripping force by the unevenness of the inner peripheral surface of the fastening ring. However, since the tightening force slides on the outer surface of the joining pipe as the connecting pipe becomes hard, it has become necessary to cope with the retaining.

  Furthermore, the waterproofing of the tightening ring and the joint body is extremely incomplete because only the O-ring set in the joint body is used for the rigid connection pipe. There was a problem that led to water leakage.

  The present invention is intended to cope with the above-described problem, and is provided at the base portion of the tube insertion core cylinder 2 with which the insertion tip a of the connection tube A abuts, along the insertion direction of the connection tube. Are formed in parallel so that the projecting pieces 21, 21... Bite into the insertion tip a of the connection tube A that is screwed toward the base of the tube insertion core tube 2, so that the connection tube A rotates in the rotation direction. The movement is fixed and the connecting pipe A is prevented from sliding in the rotating direction.

  That is, even if torque acting in the rotational direction is generated on the tightening ring 7 due to rotational friction between the tapered surface 62 of the inner diameter of the cap nut rear end restricting portion 63 and the cap nut side male tapered surface 73 of the tightening ring, the connecting pipe Since the protruding pieces 21, 21... Bite into the insertion tip a of A and the movement of the connecting pipe A in the rotational direction is fixed and prevented, the torque acting in the pushing direction acts effectively to prevent co-rotation. Can do.

  In addition, a recessed portion is formed in the middle of the protruding piece that rises in parallel along the insertion direction of the connecting pipe, and the insertion tip a of the connecting pipe A exceeds the leading end rising portion 21a of the protruding piece 21 to form the recessed portion 21b. When it is screwed, the rear end of 21a formed in a bowl shape by the recess bites into the lower surface of the insertion tip a, and the movement of the connecting tube A in the removal direction is prevented.

  Further, an annular packing 9 is set at the front end of the tightening ring via the spacer 8, and the spacer 8 crushes the annular packing 9 by the screwing of the tightening ring 7, and the inner periphery of the annular packing approaches the inner wall of the tube insertion portion. The connection pipe was configured to be in close contact with the outer periphery, and the gap between the body portion of the joint body and the outer peripheral surface of the connection pipe A was sealed.

  The spacer 8 has both end surfaces that contact the tip of the interposed tightening ring 7 and the annular packing 9 as inclined surfaces, thereby increasing the adhesion of the joint surface and pressing the outer periphery of the annular packing 9 of the spacer 8. By crushing, the thickness of the packing is pushed out to the inner peripheral side, and the adhesion to the outer peripheral surface of the connecting pipe A is efficiently enhanced.

  According to the present invention, with the configuration as described above, the protruding pieces 21 arranged in parallel along the axial direction prevent the connecting pipe A from rotating together, and the recessed portion formed in the middle part of the protruding piece is connected to the connecting pipe. The retaining force of A is strengthened, and the spacer 8 and the annular packing 9 have an effect of sealing the gap between the body portion of the main body and the outer peripheral surface of the connecting pipe A to prevent water leakage.

1 shows an embodiment of a flexible pipe connection joint according to the present invention, in which the upper half of the body half, the pipe insertion core cylinder, the fastening ring and the cap nut are disassembled and the upper half is shown in cross section showing the internal structure. Overall exploded side view Similarly, the flexible connection pipe is inserted into the pipe joint, and the relationship of the components in a state where the cap nut is not tightened is the upper half as a cross section showing the internal structure, and the lower half as a pipe insertion core cylinder as an external view. Is a vertical cross-sectional side view of a flexible pipe joint with a cross section corresponding to the upper half Similarly, the longitudinal cross-sectional side view of the flexible pipe connection joint which made FIG. 2 the structure in the state which tightened with the cap nut of the flexible connection pipe Similarly, between the spacer and the crushing annular packing and the tube insertion core tube projection piece and the tube insertion core tube showing the state where the insertion tip of the connection tube has bitten into the projection piece, and the tube insertion portion outer frame surrounding this Expanded longitudinal cross-sectional side view of the constructed tube insertion part Similarly, it shows a protruding piece according to another embodiment formed on the tube insertion core tube, and is an enlarged side view of the protruding piece formed on the tube insertion core tube.

  Embodiments of the present invention will be described below with reference to the drawings. 1 is a body part constituting the main body, and is formed between one end of the body part 1 between a tube insertion core cylinder 2 and a tube insertion part outer frame 3 which encloses this and engraves a male screw 31 on the outer periphery. As the gap, a tube insertion portion 4 for inserting a connection tube is configured, and a screw joint portion 11 to which a metal tube or the like is coupled by screwing is configured at the other end portion.

  An internal thread 32 into which the tube insertion core tube 2 is screwed is formed at the inner diameter of the tube insertion portion outer frame 3 of the body portion 1 on the side of the threaded joint 11, and the tube insertion core tube 2 is connected to the female screw 32. The male screw 22 is screwed and assembled, and a gap formed between the outer periphery of the tube insertion core tube 2 and the inner periphery of the tube insertion portion outer frame 3 constitutes the tube insertion portion 4.

  The tube insertion core tube 2 is screwed into the tube insertion portion outer frame 3 by a male screw 22 projecting in a flange shape at one end of the tube body 23 to cover the connecting tube A to be inserted. However, projecting pieces 21, 21... Rising in the insertion direction of the connecting pipe A are formed in parallel at the base portion of the male screw 22 projecting in a flange shape.

  The projecting pieces 21, 21... Are formed in a vertical streak shape by knurling or the like, and the insertion tip a of the connection pipe A that is screwed toward the base of the tube insertion core cylinder 2 rides on the projecting pieces 21, 21. The connecting tube A is configured to prevent the connecting tube A from sliding in the rotating direction by biting in and the movement of the connecting tube A in the rotating direction being fixed.

  The other end of the cylindrical body 23 is configured with a tapered surface 24 so that the connecting pipe A can be easily inserted, and the connecting pipe A inserted through the cap nut 6 is covered with the cylindrical body 23 so that the pipe insertion portion 4 is inserted. To introduce. The cap nut 6 has a rear end restricting portion 63 formed as a tapered surface 62 whose diameter is reduced from the engraved portion of the female screw 61 to the inner diameter, and the female screw 61 is screwed with the male screw 32 of the tube insertion portion outer frame 3 to form a body portion. 1 is screwed in the direction of the base.

  The tube insertion portion outer frame 3 that forms the rear end of the main body barrel portion 1 is provided with a flange 33 to constitute a stopper against the screw nut 6 being screwed, and the internal diameter of the engraved portion of the female screw 61 is the tube insertion portion. The diameter is larger than the diameter of 4, and the accommodation space 5 for the spacer 8 and the annular packing 9 is formed together with the tightening ring biting space of the cap nut rear end throttle portion.

  7 is a tightening ring, which is made of an appropriate elastic material such as metal or polyacetal resin, and has an outer surface formed on the pipe insertion portion side male tapered surface 72 that bites into and comes into contact with the rear end throttle portion of the cap nut. The end side is an inclined surface that is inclined and joined to the inclined end surface 81 of the spacer 8.

  Further, the fastening ring 7 is alternately cut from both sides by cuttings 74 for reducing the diameter, and the ring is torn. As the cap nut 6 is screwed, the taper surface 62 of the cap nut restricting portion 63 is tightened. The outer surface tapered surface 72 of the ring 7 is slid and pressed to reduce the diameter, and the unevenness 71 formed on the inner wall surface of the tightening ring 7 bites into the outer surface of the connecting pipe A, and the core tube of the connecting pipe A Tightening to 2 is performed.

  Reference numeral 8 denotes a spacer, which is made of an appropriate elastic material such as polyacetal resin. A flange 82 is formed on the outer peripheral surface so as to be clamped and fixed in a tightening space between the tube insertion portion outer frame 3 and the cap nut 6. The side of the slope shape in which the cross section of the annular packing 9 stored adjacent to the accommodating space 5 is expanded inward in a trapezoidal shape, with the cross section expanding outwardly into a trapezoidal shape. It is comprised by the slope joining which mutually fits corresponding to an end surface.

  The flexible pipe connection joint configured as described above is such that a pipe is firstly connected to a pipe from a rising portion of parallel projecting pieces 21, 21 formed on the base of a tube body 23 of the pipe insertion core cylinder 2 from the insertion tip of the connection pipe A. The length of the cap nut 6 screwed to the insertion portion outer frame 3 is marked to the rear end position, and the tube insertion core tube 2 is set to be screwed to the main body barrel portion 1 to accommodate the tube insertion portion outer frame 3. The annular packing 9, the spacer 8, and the tightening ring 7 are inserted into the space 5, and the cap nut 6 is screwed and assembled to the position where the allowance b is left.

  When the connecting pipe A is inserted from the rear end of the cap nut 6 and it is confirmed that the connecting tube A is inserted into the connecting joint up to the marking position, the cap nut 6 is rotated and screwed, so that the pipe insertion core The projecting pieces 21, 21... Bite into the insertion tip a of the connection pipe A that is screwed toward the base of the tube 2, and the movement of the connection pipe A in the rotational direction is fixed. The tightening ring 7 is propelled to the base side while preventing co-rotation.

  By pushing the clamping ring 7 toward the base side, the end face of the clamping ring 7 pushes the end face of the spacer 8, and the end face of the spacer 8 inserts the annular packing 9 into the wall surface of the receiving space 5 to insert the pipe. The inner periphery of the annular packing protrudes into the inner wall of the part and comes into close contact with the outer periphery of the connecting pipe A, thereby ensuring watertightness in the joint.

  At the same time, the inner diameter of the rear end restricting portion 63 of the cap nut 6 is squeezed on the outer surface tapered surface 72 of the fastening ring 7 interposed between the inner wall of the body male screw portion 31 and the core tube 2, and the rear end of the cap nut 6 The inner diameter of the throttle part 63 is squeezed on the outer surface tapered surface 72 of the fastening ring 7 interposed between the inner wall of the body male thread part and the pipe insertion core cylinder 2, and the connecting pipe A is crimped to the outer periphery of the pipe insertion core cylinder 2. The joint pipe is fixedly joined.

  As another embodiment related to the formation of the parallel projection pieces rising along the insertion direction of the connection pipe, the connection pipe is formed by forming a recess in the middle part of the projection pieces rising along the insertion direction of the connection pipe. When the insertion tip a of A is screwed into the recess 21b beyond the tip rising portion 21a of the projection piece 21, the rear end of 21a formed in a bowl shape by the recess bites into the lower surface of the insertion tip a, and the connecting tube The movement of A in the removal direction is prevented.

  Since the present invention is configured as described above, it acts on the tightening ring 7 in the rotational direction by the rotational friction between the tapered surface 62 of the inner diameter of the cap nut rear end restricting portion 63 and the cap nut side male tapered surface 73 of the tightening ring. Even if torque is generated, the insertion tip a of the connection pipe A bites into the parallel projection piece 21 formed at the abutting end of the connection pipe A of the pipe insertion core cylinder 2 to prevent the connection pipe A from moving in the rotation direction. Therefore, it has a high utility value on the water supply industry as a flexible pipe connection joint that can prevent the connection pipe A from rotating together.

DESCRIPTION OF SYMBOLS 1 Body part 11 of a joint main body Screw joint part 2 of a joint main body 2 Pipe insertion core cylinder 21 Parallel protrusion piece 21a Parallel protrusion piece front end rising part 21b by another Example Recessed part 21 of the parallel protrusion piece middle part by another Example Parallel projection piece 22 Flange-shaped male screw 23 of tube insertion core cylinder Tube cylinder 24 of tube insertion core cylinder Tapered surface 3 of tube insertion core cylinder Tube insertion portion outer frame 31 Male screw 32 of tube insertion portion outer frame Tube insertion portion Female thread 33 with inner diameter of outer frame Flange of outer frame of pipe insertion section 4 Pipe insertion section 5 Member housing space of outer frame of pipe insertion section 6 Cap nut 61 Female thread engraving section 62 Tapered surface 63 of inner diameter of throttle section Cap nut narrowing section 7 Tightening Ring 71 Concavity and convexity 72 formed on the inner wall surface of the fastening ring Male taper surface 73 on the side of the tube insertion portion Split portion 8 Spacer 81 Inclined end face 82 of spacer Spacer outer peripheral flange 9 Annular packing A Flexible connecting tube Interference of the insertion tip b cap nut flexible connecting tube

Claims (4)

  In a flexible pipe connection joint in which a connection pipe inserted into a pipe insertion part of a trunk part is fastened to a pipe insertion core cylinder with a tightening nut via a tightening ring, at the base of the pipe insertion core cylinder where the insertion tip of the connection pipe abuts A flexible pipe connection joint characterized in that a plurality of protruding pieces rising in the insertion direction of the connection pipe are formed in parallel.   2. The flexible pipe connection joint according to claim 1, wherein a concave portion is formed in the middle part of the protrusion piece that rises in parallel along the insertion direction of the connection pipe and is parallel.   An annular packing is set at the end of the tightening ring via a spacer, and the spacer crushes the annular packing by the screwing of the tightening ring, so that the inner periphery of the annular packing protrudes from the inner wall of the tube insertion part and closely contacts the outer periphery of the connecting pipe The flexible pipe connection joint according to claim 1 or 2, wherein   The flexible pipe connection joint according to claim 3, wherein both end faces of the spacer interposed between the front end of the fastening ring and the annular packing are inclined surfaces.

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