JP5477844B2 - Incore - Google Patents

Description

  The present invention relates to a substantially cylindrical in-core inserted into a fluid pipe and preventing deformation of the fluid pipe.

  A conventional in-core is a movement restricting portion formed to protrude in the outer diameter direction on the outer peripheral surface spaced a predetermined distance from one end surface thereof, or a movement formed by expanding the diameter in the circumferential direction on one end surface side of the outer peripheral surface. A regulation part is provided (see, for example, Patent Document 1).

Japanese Patent No. 4140869 (page 5, FIGS. 4 and 5)

  In the in-core described in Patent Document 1, when the movement restricting portion is formed to protrude in the outer diameter direction on the outer peripheral surface separated from the one end surface of the in-core by a predetermined distance, the movement restricting portion is arranged on the inner periphery of the fluid pipe. There is a problem that the insertion work of the in-core is troublesome because it is inserted by moving a predetermined distance while being in contact with the surface. Further, even if the in-core is inserted into the fluid pipe, the movement restricting portion does not come into contact with the inner peripheral surface of the opening of the fluid pipe that is relatively easily deformed, so that the opening of the fluid pipe may be deformed. In addition, when the movement restricting portion is formed with an enlarged diameter in the circumferential direction on one end surface side of the outer peripheral surface of the incore, the movement restriction between the incore and the fluid pipe is not sufficient, and the incore escapes from the fluid pipe. There is a fear.

  The present invention has been made paying attention to such problems, and can easily insert the in-core, and can reliably prevent the deformation of the opening of the fluid pipe, and can restrict movement with the fluid pipe. An object is to provide an in-core that can be performed satisfactorily.

In order to solve the above problems, the in-core of the present invention comprises:
A substantially cylindrical incore inserted into the fluid pipe to prevent deformation of the fluid pipe,
The movement restricting portion that protrudes from the outer peripheral surface of the in-core in the outer diameter direction and has a protruding surface that comes into contact with the inner peripheral surface of the fluid pipe and restricts relative movement with the fluid pipe is an end of the outer surface of the in-core Are arranged at predetermined intervals along the circumferential direction,
The projecting surface is formed in the axial direction continuously to the opening side end surface on the opening side in the in-core inserted through the opening of the fluid pipe ,
An outer peripheral surface of the in-core that is closer to the opening-side end surface is formed as a diameter-expanding surface that gradually increases in diameter in the axial direction toward the opening-side end surface .
According to this feature, the protrusion surface of the movement restricting portion that restricts relative movement with the fluid pipe is formed in the axial direction continuously to the opening side end face of the in-core inserted through the opening of the fluid pipe. Since the projecting surface comes into contact with the inner peripheral surface of the fluid pipe at the end of the insertion of the in-core into the fluid pipe, the insertion operation until the projecting surface comes into contact with the fluid pipe can be easily performed. In addition, the protruding surface formed in the axial direction continuously to the opening side end surface of the in-core can reliably prevent the deformation of the opening of the fluid pipe and can sufficiently restrict the movement with the fluid pipe. Furthermore, the deformation of the fluid pipe can be prevented by making contact with the inner peripheral surface of the fluid pipe by using an appropriate portion of the diameter-expanded surface gradually expanding in the axial direction toward the opening-side end face.

The incore of the present invention is
The diameter-expanded surface is formed substantially flush with the protruding surface in the vicinity of the opening-side end surface.
According to this feature, the expansion surface formed substantially flush with the protruding surface is brought into contact with the inner peripheral surface of the fluid tube along the circumferential direction together with the protruding surface, thereby reliably preventing deformation of the fluid tube. it can.

The incore of the present invention is
A taper surface that is inclined between the outer peripheral surface of the in-core and the projecting surface is formed at an insertion side end portion on the insertion side of the fluid pipe in the movement restricting portion.
According to this feature, when the in-core is inserted into the fluid pipe, the tapered surface that is inclined toward the outer peripheral surface and the protruding surface of the in-core formed on the insertion-side end portion on the insertion side of the fluid pipe has an inner circumference of the fluid pipe. Since the incore is gradually positioned with respect to the fluid pipe while being in contact with the surface, the protruding surface protruding from the outer peripheral surface of the incore can smoothly contact the inner peripheral surface of the fluid pipe.

The incore of the present invention is
The movement restricting portion is formed by pressing an inner peripheral surface of the in-core in an outer diameter direction.
According to this feature, the movement restricting portion is formed by pressing the inner peripheral surface of the incore in the outer diameter direction, so that it can be formed integrally with the incore without attaching a special member to the outer peripheral surface of the incore. .

It is a perspective view which shows the in-core in Example 1. FIG. (A) is a front view which shows an in-core, (b) is a right view similarly, (c) is a left view similarly. (A) is AA sectional drawing of FIG.2 (c), (b) is BB sectional drawing of (a). (A) is sectional drawing which shows the state in which the pipe joint was attached to the fluid pipe, (b) is sectional drawing which shows the state by which the press ring was further tightened from the state of (a). It is sectional drawing which shows the state in which the in-core in Example 2 was inserted in the fluid pipe | tube.

  EMBODIMENT OF THE INVENTION The form for implementing the in-core which concerns on this invention is demonstrated below based on an Example. Hereinafter, the front side in FIG. 2A will be described as the front side (front side) of the in-core.

  The in-core according to the first embodiment will be described with reference to FIGS. First, reference numeral 1 in FIG. 1 denotes an in-core to which the present invention is applied. The in-core 1 has a substantially cylindrical shape and is inserted into a fluid pipe to prevent deformation of the fluid pipe.

  Specifically, as shown in FIGS. 1 and 2 (a) to 2 (c), the incore 1 has an outer diameter substantially equal to the inner diameter of the fluid pipe into which the incore 1 is inserted, and is in the axial direction. The main body part 11 formed to have a predetermined length and the diameter of the main body part 11 that is continuous with one end (the end on the right side in FIG. 2 (a)) is increased in the axial direction toward one opening side end face 12a. Part 12 and a diameter-reduced part 13 that is continuous with the other end (the left-side end in FIG. 2 (a)) of main body 11 and is reduced in the axial direction toward the other opening-side end face 13a. ing.

  That is, the outer peripheral surface of the enlarged diameter portion 12 is formed on the enlarged diameter surface 12b that gradually increases in the axial direction toward the opening side end surface 12a, and the outer peripheral surface of the reduced diameter portion 13 is formed on the opening side end surface 13a. It is formed on a diameter-expanded surface 13b that gradually expands in the axial direction.

  At the end of the in-core 1 on the opening side end face 12a side, a plurality of movement restricting portions 14 projecting in the outer diameter direction over the enlarged diameter portion 12 and the main body portion 11 are provided at predetermined intervals along the circumferential direction (this embodiment). In the example, it is formed at three positions every 120 °).

  The top of the outer peripheral surface of the movement restricting portion 14 is formed on a protruding surface 14a that comes into contact with the inner peripheral surface of the fluid pipe to be inserted, and this protruding surface 14a is formed in the axial direction continuously to the opening side end surface 12a. Has been. The relative movement between the in-core 1 and the fluid pipe is restricted by the abutment between the projecting surface 14a and the inner peripheral surface of the fluid pipe.

  Further, a tapered surface 14b that is inclined between the outer peripheral surface of the main body 11 and the protruding surface 14a is formed at the end of the movement restricting portion 14 on the reduced diameter portion 13 side.

  In particular, in this embodiment, as shown in FIGS. 3A and 3B, the movement restricting portion 14 is provided at the enlarged diameter portion 12 and the end portion of the main body portion 11 continuous with the enlarged diameter portion 12. The movement restricting portion 14 is formed by a hydraulic bulge manufacturing method so that the inner peripheral surface at the location where it is located bulges in the outer diameter direction relative to the inner peripheral surface at the location where the movement restricting portion 14 is not provided.

  That is, after mounting the incore in which the movement restricting portion 14 is not yet formed in a mold (not shown) having a predetermined concave inner peripheral surface for forming the movement restricting portion 14, Injecting a liquid such as oil into the incore, causing a high pressure to act on the liquid injected into the incore, and the inner peripheral surface of the incore is pressed in the outer diameter direction by the hydraulic pressure. The predetermined portion is formed in the concave portion, the outer peripheral surface of the portion protrudes in a convex shape, and the movement restricting portion 14 is formed in the in-core. The movement restricting portion may be formed by another bulge manufacturing method. Furthermore, the in-core movement restricting portion, the enlarged diameter portion, and the reduced diameter portion may be formed by physical pressing using a mold having a predetermined shape.

  Next, how to use the in-core will be described.

  FIG. 4A shows a state where the pipe joint 19 is attached to the fluid pipe 2 made of a resin such as polyethylene and through which clean water flows. This pipe joint 19 includes the in-core 1 described above, a joint body 3 made of ductile cast iron, a press ring 4 fastened to the joint main body 3, a lock ring 5 disposed on the inner peripheral surface of the press ring 4, and a fluid pipe 2. Is composed of a packing 6 for watertightly joining the joint body 3 and a retainer 7 for pressing the packing 6.

  A stopper 3d that protrudes in the tube center direction is provided at the center of the inner surface of the joint body 3, and a diameter-enlarged portion 3a that accommodates the packing 6 is formed at a position on the pusher wheel side 4 of the joint body 3. A flange 3b is continuously provided, and an engaging portion 3c is provided at the end of the enlarged diameter portion 3a to prevent the retainer 7 from moving.

  A flange 4 b of the press ring 4 is attached to a flange 3 b provided on the outer peripheral surface of the joint body 3 by a plurality (not shown) of T-head bolts 9 and nuts 10, and the lock ring 5 is an inner tapered surface 4 a of the press ring 4. It is tightened by.

  The lock ring 5 is made of a material harder than the fluid pipe 2, and the outer peripheral surface of the lock ring 5 is formed on an outer tapered surface 5 a having substantially the same inclination as the inner tapered surface 4 a of the push ring 4. A plurality of blades 5 b facing the inner diameter direction are formed on the inner peripheral surface of the lock ring 5.

  In order to attach the pipe joint 19 to the fluid pipe 2, first, the reduced diameter portion 13 of the in-core 1 is inserted through the opening 2 a of the fluid pipe 2, so that the outer peripheral surface of the main body portion 11 is the fluid pipe 2. Then, the taper surface 14b of the movement restricting portion 14 is inserted into contact with the inner peripheral surface of the fluid pipe 2 (see FIG. 1). Further, when the in-core 1 is inserted into the fluid pipe 2, the protruding surface 14 a is inserted into contact with the inner peripheral surface of the fluid pipe 2.

  Thus, the outer peripheral surface of the main body 11 and the projecting surface 14a are provided at the end of the movement restricting portion 14 on the reduced diameter portion 13 side, that is, the insertion side end of the movement restricting portion 14 on the insertion side of the fluid pipe 2. Since the tapered surface 14b is formed so as to incline, the tapered surface 14b comes into contact with the inner peripheral surface of the fluid pipe 2 by inserting the in-core 1 into the fluid pipe 2, and the in-core 1 gradually moves relative to the fluid pipe. Since the positioning is performed, the protruding surface 14 a protruding from the outer peripheral surface of the main body 11 and the outer peripheral surface of the enlarged diameter portion 12 can smoothly contact the inner peripheral surface of the fluid pipe 2.

  Even when the insertion of the in-core 1 is completed, the opening-side end portion including the opening-side end surface 12a of the enlarged diameter portion 12 is in a state of protruding outward from the opening 2a of the fluid pipe 2 (FIG. 4). (See (a)).

  Next, a T-head bolt 9 is inserted into the flange 3b and the flange 4b, a nut 10 is temporarily tightened to the T-head bolt 9, and the packing 6 expands the push ring 4 in which the lock ring 5 and the retainer 7 are mounted. The joint body 3 inserted into the diameter portion 3a is temporarily fixed (see FIG. 4A).

  Next, as shown in FIG. 4A, the fluid pipe 2 in which the in-core 1 is mounted is moved from the end of the push ring 4 temporarily fixed to the joint body 3 to the opening-side end face 12 a of the enlarged diameter portion 12. Is inserted until it comes into contact with the stopper 3d. In the state of FIG. 4A, a space S is formed between the end of the fluid pipe 2 and the stopper 3d.

  Then, as shown in FIG. 4B, the temporarily tightened nut 10 is tightened until the flange 3b and the flange 4b come into contact with each other. When the nut 10 is tightened, the pusher wheel 4 moves to the joint body 3 side, the lock ring 5 engaged with the inner tapered surface 4a of the pusher wheel 4, and the retainer 7 in contact with the end of the lock ring 5; Moves to the joint body 3 side, and the packing 6 is pushed into the enlarged diameter portion 3 a of the joint body 3.

  When the lock ring 5 moves to the joint body 3 side, the blade 5b of the lock ring 5 bites into the surface of the fluid pipe 2, and the fluid pipe 2 moves together with the lock ring 5 to the joint body 3 side. That is, the opening 2a of the fluid pipe 2 and the stopper 3d approach each other, and the space S gradually decreases. At this time, since the opening side end surface 12a of the incore 1 is in contact with the stopper 3d, the incore 1 is pressed by the stopper 3d and further inserted into the fluid pipe 2, and the mounting operation of the incore 1 is performed. Complete.

  As described above, the outer peripheral surface of the in-core 1 near the opening-side end surface 12a is formed on the diameter-enlarged surface 12b that gradually increases in the axial direction toward the opening-side end surface 12a. Even if the inner peripheral surface of the fluid pipe 2 is deformed in the inner diameter direction, an effect of preventing deformation of the fluid pipe 2 can be obtained by making contact with the inner peripheral face of the fluid pipe 2 by using an appropriate portion of the enlarged diameter surface 12b. .

  Further, as described above, the movement restricting portion 14 is formed by pressing the inner peripheral surface of the incore in the outer diameter direction, so that a special member is not attached to the outer peripheral surface of the incore, and is integrated with the incore. Can be formed.

  As described above, in the incore 1 of the first embodiment, the projecting surface 14a of the movement restricting portion 14 that restricts the relative movement with the fluid pipe 2 is the opening side in the incore inserted through the opening 2a of the fluid pipe 2. Is formed in the axial direction continuously to the opening-side end surface 12a of the first member, the projecting surface 14a comes into contact with the inner peripheral surface of the fluid tube 2 at the end of the insertion of the in-core 1 into the fluid tube 2. Therefore, not only can the insertion operation until the projecting surface 14a abuts on the fluid pipe 2 be performed, but the projecting surface 14a formed in the axial direction continuously to the opening-side end surface 12a of the incore 1 The opening 2a of the pipe 2 can be reliably prevented from being deformed, and the movement with the fluid pipe 2 can be sufficiently restricted.

  Next, the in-core according to the second embodiment will be described with reference to FIG. In addition, the same structure as Example 1 and the overlapping structure are abbreviate | omitted.

  As shown in FIG. 5, the in-core 21 according to the second embodiment is formed integrally with an end portion on the opening side end surface 32 a side of the protruding surface 34 a and an end portion on the opening side end surface 32 a side of the enlarged diameter surface 32 b. Has been. That is, the enlarged diameter surface 32b is formed substantially flush with the protruding surface 34a in the vicinity of the opening side end surface 32a.

  In this way, the diameter expansion surface 32b formed substantially flush with the projecting surface 34a is brought into contact with the inner peripheral surface of the fluid tube 2 along the circumferential direction together with the projecting surface 34a, thereby deforming the fluid tube 2. It can be surely prevented.

  Although the embodiments of the present invention have been described with reference to the drawings, the specific configuration is not limited to these embodiments, and modifications and additions within the scope of the present invention are included in the present invention. It is.

  For example, in the first and second embodiments, in the fluid pipe 2, the fluid flowing inside is clean water, but the fluid is not necessarily limited to clean water, and may be, for example, industrial water, or may be gas or gas-liquid. The present invention can also be applied to a fluid pipe through which a mixed fluid flows.

  In the first and second embodiments, the in-cores 1 and 21 are formed with the enlarged-diameter portions 12 and 32 having the enlarged-diameter surfaces 12b and 32b, but the protruding surface is continuous with the opening-side end surface of the in-core. As long as it is formed in the axial direction, the enlarged diameter portion may not be formed in the in-core.

  Moreover, in the said Example 1, 2, although the movement control parts 14 and 34 are formed by pressing the inner peripheral surface of the incores 1 and 21 to an outer-diameter direction, a protrusion surface becomes the opening side end surface of an incore. As long as it is continuously formed in the axial direction, not limited to this, for example, a separate movement restricting portion may be fixed to the outer peripheral surface of the in-core.

DESCRIPTION OF SYMBOLS 1 Incore 2 Fluid pipe 2a Opening 12a Opening side end surface 12b Expanded surface 14 Movement control part 14a Protruding surface 14b Tapered surface

Claims (4)

A substantially cylindrical incore inserted into the fluid pipe to prevent deformation of the fluid pipe,
The movement restricting portion that protrudes from the outer peripheral surface of the in-core in the outer diameter direction and has a protruding surface that comes into contact with the inner peripheral surface of the fluid pipe and restricts relative movement with the fluid pipe is an end of the outer surface of the in-core Are arranged at predetermined intervals along the circumferential direction,
The projecting surface is formed in the axial direction continuously to the opening side end surface on the opening side in the in-core inserted through the opening of the fluid pipe ,
An in-core having an outer peripheral surface near the opening-side end surface of the in-core is formed as a diameter-expanding surface that gradually expands in the axial direction toward the opening-side end surface . 2. The in-core according to claim 1 , wherein the diameter-expanded surface is formed substantially flush with the protruding surface in the vicinity of the opening-side end surface. The taper surface which inclines toward the outer peripheral surface of the said in-core, and the said protrusion surface is formed in the insertion side edge part of the insertion side to the said fluid pipe | tube in the said movement control part, The Claim 1 or 2 characterized by the above-mentioned. In-core as described. The movement restricting portion-core according to any one of claims 1 to 3, characterized in that it is formed by pressing the inner peripheral surface of the incore in the outer diameter direction.

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