JP2011106538A - Pipe joint - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pipe joint, preventing deterioration in sealing function even when the flexibility of a pipe to be connected is high. <P>SOLUTION: Areas excluding the circumferential groove 60 of an inner circumference of a collet body 50 are projection parts 62. While a cover nut 46 is fastened, the plurality of projection parts 62 of the collet body 50 are disposed to radially outside of O-rings 24, 26 fitted in the circumferential grooves 20, 22 of a core 16, and to radially outside of each mountain part 63 of the core 16, so as to sandwich the pipe 15 therebetween. Therefore, the deterioration in an interference caused by changes with time of the pipe 15 is prevented, and protrusion of the O-rings 24, 26 from the circumferential grooves 20, 22 of the core 16 is prevented. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a pipe joint for connecting a fluid pipe.

  Conventionally, as a joint for piping for connecting a fluid piping, for example, as disclosed in Patent Document 1, an annular rib for retaining a pipe is sealed on the outer peripheral surface of an insert and an O for sealing between the piping. There is a pipe joint that has a ring and is formed with an annular groove for preventing the pipe from coming off on the inner peripheral surface of the collet.

JP-A-3-209091

  However, in the joint for piping like patent document 1, since the deformation | transformation of piping becomes large when the flexibility of piping to connect is high, there exists a possibility that the sealing function between a collet and piping may fall.

  The present invention has been made to solve the above-described problem, and an object of the present invention is to obtain a joint for piping that can prevent deterioration of the sealing function even when the flexibility of the piping to be connected is high.

  In the pipe joint according to the first aspect of the present invention, a plurality of annular groove portions along the circumferential direction are formed at predetermined intervals along the longitudinal direction, and a portion excluding the plurality of groove portions is annular along the circumferential direction. A core portion that is a crest portion, a screw portion is formed at a longitudinal end portion of the outer peripheral portion, an outer cylinder that covers the core material, a cover nut that tightens the screw portion of the outer cylinder, and a groove portion of the core material A water-stop member fitted into the outer cylinder and the core member, and a pipe between the core member and a ring-shaped convex portion along the circumferential direction on the inner periphery. A plurality of protrusions are formed at predetermined intervals along the longitudinal direction, and in a state where the cover nut is tightened, the plurality of convex portions sandwiches the pipe and the radially outer side of the water stop member and the peak portions of the core material A collet disposed radially outward.

  With the cover nut tightened on the screw part of the outer cylinder, the ring-shaped convex parts along the circumferential direction formed on the inner circumference of the collet are fitted into the groove parts of the core material with the piping interposed therebetween. It arrange | positions in the radial direction outer side of a water member. For this reason, it is possible to prevent the tightening margin from being lowered due to the deformation of the piping over time. In addition, a plurality of ring-shaped convex portions along the circumferential direction formed on the inner periphery of the collet with the cover nut tightened on the screw portion of the outer cylinder are arranged radially outside the peak portion of the core material with the piping interposed therebetween. Placed in. For this reason, it can prevent that a water stop member protrudes from the groove part of a core material. As a result, it is possible to prevent the sealing function from being lowered even when the flexibility of the piping to be connected is high.

  The invention according to claim 2 is the joint for piping according to claim 1, wherein the water stop member is an O-ring.

  By making the water stop member an O-ring, the water stop member can be easily mounted and procured.

  As described above, the pipe joint according to the first aspect of the present invention can prevent the sealing function from being lowered even when the flexibility of the pipe to be connected is high.

  The pipe joint according to the second aspect of the present invention is easy to mount and procure an O-ring as a water stop member.

It is a half sectional view showing the assembly state of the joint for piping concerning a 1st embodiment of the present invention. It is a half sectional view showing the state in the middle of the assembly of the joint for piping concerning a 1st embodiment of the present invention. It is a half sectional view showing the state before the assembly of the joint for piping concerning a 1st embodiment of the present invention. It is a half sectional view showing the collet of the joint for piping concerning a 1st embodiment of the present invention. FIG. 5 is an enlarged cross-sectional view taken along a line 5-5 in FIG. 4. It is a half sectional view showing the assembled state of the joint for piping concerning a 2nd embodiment of the present invention. It is a half sectional view showing the state in the middle of the assembly of the joint for piping concerning a 2nd embodiment of the present invention. It is a half sectional view showing the state before the assembly of the joint for piping concerning a 2nd embodiment of the present invention. It is a half sectional view showing a collet of a joint for piping according to a second embodiment of the present invention.

(First embodiment)
Below, 1st Embodiment of this invention is described according to FIGS.

  FIG. 1 is a half cross-sectional view showing an assembled state of the pipe joint of the present embodiment, and FIG. 2 is a half cross-sectional view showing a state during the assembly of the pipe joint of the present embodiment. FIG. 3 is a half cross-sectional view showing a state before the piping joint of the present embodiment is assembled. FIG. 4 is a half sectional view showing a collet of the joint for piping according to the present embodiment, and FIG. 5 is an enlarged sectional view taken along the line 5-5 in FIG.

  As shown in FIGS. 1 to 3, the base body 12 of the pipe joint 10 is divided into two members, a nut 14 and a core material 16. The nut 14 is fastened to a pipe 13, and the core material 16 is a pipe. The pipe (or hose, tube, etc.) 15 is connected. The inner peripheral shape of the nut 14 and the outer peripheral shape of the core member 16 are circular.

  More specifically, an engaging portion 14A is formed at one end portion (the right end portion in the drawing) along the axial direction of the inner periphery of the nut 14. The other part (the part on the left side of the drawing) along the axial direction of the inner circumference of the nut 14 is a female screw part 14B in which a female screw is formed, and the female screw part 14B of the nut 14 is connected to the pipe 13. It is possible to fasten to a male screw portion 13A formed at the outer peripheral end portion.

  The engaging portion 14 </ b> A of the nut 14 is an inclined portion whose inner diameter is reduced from the axial center of the nut 14 toward the axial end (right end in the drawing). On the other hand, a contact portion 16A is formed at one end portion (left end portion in the drawing) along the axial direction of the outer peripheral portion of the core material 16, and the axial center portion of the core material 16 extends along the axial direction. A flow path 17 that is a through hole is formed.

  A sealing material 21 is disposed between the end surface 16B on the axial contact portion 16A side of the core material 16 and the end surface 13B of the pipe 13.

  The contact portion 16 </ b> A of the core material 16 is an inclined portion whose outer diameter increases from the center in the axial direction of the core material 16 toward the end in the axial direction (left end portion in the drawing). The portion 16 </ b> A and the engaging portion 14 </ b> A of the nut 14 are in contact with each other so that the core material 16 does not fall out of the nut 14. Further, the contact portion 16A of the core member 16 and the engaging portion 14A of the nut 14 slide so that the core member 16 and the nut 14 can rotate in the direction around the axis.

  On the other hand, the other part (the part on the right side of the drawing) along the axial direction of the outer peripheral part of the core member 16 is an inner cylinder part 16C protruding from the nut 14. The outer diameter of the inner cylinder portion 16 </ b> C of the core material 16 is a cylindrical shape having an outer diameter substantially the same as the inner diameter of the pipe 15 to be used. Further, three circumferential grooves 18, 20, and 22 are formed on the outer peripheral portion of the inner cylindrical portion 16C of the core member 16 at intervals along the axial direction, and these circumferential grooves 18, 20, and 22 are formed. Among them, O-rings 24 and 26 as water-stopping members are fitted in the peripheral grooves 20 and 22 on the tip side (right side in the drawing), respectively. Moreover, the site | part except the circumferential grooves 20 and 22 in the outer peripheral part of the core material 16 is each the cyclic | annular peak part 63 along the circumferential direction.

  In addition, the outer cylinder 42 is arranged with a certain gap on the outer side in the axial radial direction with respect to the inner cylinder portion 16C of the core member 16, and one end portion along the axial direction on the inner periphery of the outer cylinder 42 (drawing) The right end portion is an inclined portion 42A that increases in diameter toward the end tip direction (the right side in the drawing). Further, a male screw portion 42B is formed on one end portion (the right end portion in the drawing) along the axial direction in the outer peripheral portion of the outer cylinder 42, and a cover nut 46 is fastened to the male screw portion 42B. It has become.

  Further, an inclined portion 46A having a diameter decreasing toward the shaft tip direction (right side in the drawing) is formed on one end portion (right side end in the drawing) along the axial direction on the inner periphery of the cover nut 46. Further, a female screw portion 46B is formed on the other end portion (left end portion in the drawing) along the axial direction on the inner periphery of the cover nut 46, and the female screw portion 46B is a male screw portion 42B of the outer cylinder 42. To be concluded.

  Note that the outer peripheral shape of one end portion (the left end portion in the drawing) 46C along the axial direction in the outer peripheral portion of the cover nut 46 is hexagonal, and the other end portion along the axial direction in the outer peripheral portion of the cover nut 46 is the other. The end portion (right side end portion in the drawing) 46D has a truncated cone shape whose diameter decreases toward the end tip direction (right direction in the drawing).

  A collet 44 shown in FIGS. 4 and 5 is disposed between the inner cylinder portion 16 </ b> C of the core material 16 and the outer cylinder 42.

  As shown in FIG. 5, the collet 44 includes a collet main body 50 having a cylindrical shape. In addition, the collet main body 50 of this embodiment is comprised with the metal.

  As shown in FIG. 4, the center part 54 formed at the center in the longitudinal direction of the collet body 50 has an outer periphery 54A parallel to the axis 50A of the collet body 50, and has a cylindrical shape with an outer diameter D1.

  A pair of inclined portions 56 and 58 are formed from the central portion 54 of the collet body 50 toward both ends of the collet body 50 in the longitudinal direction (the direction along the axis 50A). These inclined portions 56 and 58 are inclined in a direction in which the outer diameters D2 and D3 become smaller from the central portion 54 of the collet body 50 toward both ends in the longitudinal direction.

  In addition, the inclination angle θ1 of the outer periphery 56A of the inclined portion 56 in the collet body 50 with respect to the axis 50A of the collet body 50 is equal to the inclination angle θ2 of the outer periphery 58A of the inclined portion 56 of the collet body 50 with respect to the axis 50A of the collet body 50. ing.

  A plurality of circumferential grooves 60 as ring-shaped grooves are formed along the circumferential direction of the collet body 50 on the inner circumference 50 </ b> B of the collet body 50, and these circumferential grooves 60 extend along the longitudinal direction of the collet body 12. Are formed at predetermined intervals. In the present embodiment, two circumferential grooves 60 are formed across the center of the collet body 50 in the longitudinal direction.

  In addition, the site | part except the circumferential groove 60 in the center part 54 of the collet main body 12, and the inner periphery 54B, 56B, 58B of the inclination parts 56 and 58 is parallel to the axis 50A of the collet main body 50. FIG.

  Further, portions of the collet body 50 excluding the inner peripheral circumferential groove 60 protrude toward the axis 50 </ b> A of the collet body 50, respectively, and form ring-shaped convex portions 62 along the inner periphery of the collet body 50. In other words, on the inner circumference (on the pipe 15 side) of the collet main body 50, ring-shaped convex portions 62 along the circumferential direction of the collet main body 50 are arranged at predetermined intervals along the longitudinal direction (axial direction) of the collet main body 50. Is formed.

  As shown in FIG. 1, the convex portion 62 of the collet 44 is fitted into the circumferential grooves 20 and 22 of the core member 16 with the pipe 15 sandwiched in a state where the cover nut 46 is fastened to the male screw portion 42 </ b> B of the outer cylinder 42. The O-rings 24 and 26 are arranged on the outer side in the radial direction and on the outer side in the radial direction of the peak portion 63 of the core member 16.

  Accordingly, the plurality of convex portions 62 of the collet 44 can prevent a reduction in tightening allowance due to deformation (sagging) of the pipe 15 with time, and the O-rings 24 and 26 protrude from the circumferential grooves 20 and 22 of the core member 16. It can be prevented.

  As shown in FIG. 5, the collet body 50 is formed with two first slits 64 and four second slits 66, and each slit is formed at equal intervals in the circumferential direction of the collet body 50. Yes. The two first slits 64 are arranged at positions facing each other (position on the diameter). As shown in FIG. 4, the first slit 64 includes an opening 64 </ b> A at an end 56 </ b> C of one inclined portion 56 of the collet body 50, and the collet body along the axis 50 </ b> A of the collet body 50 from the opening 64 </ b> A. 50 is formed beyond the central portion 54, and the tip end portion 64 </ b> B reaches the other inclined portion 58 of the collet body 50. On the other hand, the second slit 66 includes an opening 66A at the end 58A of the inclined portion 58 on the opposite side to the first slit 64, and the central portion 54 of the collet body 50 extends along the axis 50A of the collet body 50 from the opening 66A. The tip end portion 66 </ b> B reaches the other inclined portion 56 of the collet body 50.

  The first slit 64 and the second slit 66 intersect with the plurality of circumferential grooves 20, respectively. Further, the first slit 64 has the same width W1 from the tip portion 64B toward the opening portion 64A, and the second slit 66 has the same width W2 from the tip portion 66B toward the opening portion 66A. Further, the width W1 of the first slit 64 and the width W2 of the second slit 66 are equal (W1 = W2).

  Note that a retaining ring 28 is disposed in the circumferential groove 18 provided in a portion closest to the contact portion 16A in the inner cylinder portion 16C of the core member 16, and an end portion on the opposite side of the inclined portion 42A in the outer cylinder 42 is provided. A convex portion 42C is formed to project from the inner periphery of the projection. The retaining ring 28 has a configuration in which a long member having a circular cross section is curved in a ring shape, and can be elastically deformed in the radial direction of the ring. For this reason, the retaining ring 28 can be set in the circumferential groove 18 by moving the retaining ring 28 while expanding the retaining ring 28 with the outer cylinder 42 set on the core member 16. As a result, the convex portion 42C of the outer cylinder 42 is engaged with the retaining ring 28, so that the outer cylinder 42 does not fall off the core material 16 of the base 12 and the nut 14 does not fall off the core material 16 of the base 12 as well. It has become. That is, the outer cylinder 42 and the nut 14 are held on the core member 16 of the base 12 by the retaining ring 28.

Next, the operation and effect of this embodiment will be described.
In the pipe joint 10 of this embodiment, the nut 14 of the base 12 is fastened to the pipe 13 and the core 16 of the base 12 is connected to the pipe 13. The other end of the core member 16 in the axial direction is an inner cylindrical portion 16C protruding from the nut 14, the pipe 15 is connected to the inner cylindrical portion 16C, and a cover nut is connected to the male screw portion 42B of the outer cylinder 42. By fastening 46, the collet 44 is fastened to the inner cylinder part 16C of the core member 16 with the pipe 15 interposed therebetween, and the pipe 15 is connected to the inner cylinder part 16C.

  At this time, as shown in FIG. 1, in a state where the cover nut 46 is tightened to the male screw portion 42 </ b> B of the outer cylinder 42, the convex portion 62 of the collet 44 sandwiches the pipe 15 and the circumferential grooves 20, 22 of the core material 16. The O-rings 24 and 26 fitted in the outer side in the radial direction are arranged. For this reason, it is possible to prevent a decrease in the tightening allowance due to the temporal deformation of the pipe 15. Further, the convex portion 62 of the collet 44 is disposed on the outer side in the radial direction of the peak portion 63 of the core member 16 with the pipe 15 interposed therebetween. For this reason, it is possible to prevent the O-rings 24 and 26 from protruding from the circumferential grooves 20 and 22 of the core member 16.

  As a result, even when the flexibility of the pipe 15 to be connected is high, it is possible to prevent the pipe 15 from coming off and the sealing function from being lowered.

  Moreover, in this embodiment, since the water stop member provided in the circumferential grooves 20 and 22 of the collet 44 is the O-rings 24 and 26, it is easy to attach and procure the water stop member.

(Second Embodiment)
Below, 2nd Embodiment of this invention is described according to FIGS.
In addition, about the same member as 1st Embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  FIG. 6 is a half cross-sectional view showing an assembled state of the pipe joint of the present embodiment, and FIG. 7 is a half cross-sectional view showing a state during the assembly of the pipe joint of the present embodiment. FIG. 8 is a half cross-sectional view showing a state before the piping joint of the present embodiment is assembled. FIG. 9 is a half sectional view showing a collet of the joint for piping of the present embodiment.

  As shown in FIG. 9, in the present embodiment, circumferential grooves 60 are formed at four locations at equal intervals along the longitudinal direction of the collet body 50, and a portion excluding the inner circumferential circumferential groove 60 in the collet body 50. Are projecting toward the axis 50 </ b> A of the collet body 50, and form ring-shaped convex portions 62 along the inner periphery of the collet body 50.

  Accordingly, in the present embodiment, as shown in FIG. 6, the plurality of convex portions 62 of the collet 44 sandwich the pipe 15 with the cover nut 46 being fastened to the male screw portion 42 </ b> B of the outer cylinder 42. The O-rings 24, 26 fitted in the circumferential grooves 20, 22 are arranged on the outer side in the radial direction and on the outer side in the radial direction of each peak portion 63.

  Next, the operation and effect of this embodiment will be described.

  In the piping joint 10 of the present embodiment, as shown in FIG. 1, the convex portion 62 of the collet 44 sandwiches the pipe 15 with the cover nut 46 tightened to the male screw portion 42 </ b> B of the outer cylinder 42. The O-rings 24 and 26 fitted in the 16 circumferential grooves 20 and 22 are arranged on the outer side in the radial direction. For this reason, it is possible to prevent a decrease in the tightening allowance due to the temporal deformation of the pipe 15. Moreover, the convex part 62 of the collet 44 is arrange | positioned in the radial direction outer side of each peak part 63 of the core material 16 on both sides of the pipe 15. As shown in FIG. For this reason, it is possible to prevent the O-rings 24 and 26 from protruding from the circumferential grooves 20 and 22 of the core member 16.

  As a result, the same effect as the first embodiment can be obtained in this embodiment.

[Other Embodiments]
Although the present invention has been described in detail with respect to specific embodiments, the present invention is not limited to such embodiments, and various other embodiments are possible within the scope of the present invention. It will be apparent to those skilled in the art. For example, in each of the above embodiments, an O-ring as a water-stop member is used, but another water-stop member such as a seal tape may be used instead of the O-ring.

  Moreover, the number of the convex part (circumferential groove) of the collet 44 and the peripheral groove (mountain part) of the core material 16 is not limited to the number of each said embodiment, It is good also as another number.

  Further, the pipe joint of the present invention is not applied to the pipe joint 30 of the above-described embodiment, and other pipe joints may be used as long as the structure is described in claim 1 or claim 2.

10 Piping joint 12 Base 13 Piping 15 Pipe (Piping)
16 Core material 20 Circumferential groove (groove)
22 Circumferential groove (groove)
24 O-ring (water-stop member)
26 O-ring (water-stop member)
42 outer cylinder 44 collet 46 cover nut 50 collet body 60 circumferential groove 62 convex part 63 mountain part

Claims (2)

A plurality of annular groove portions along the circumferential direction are formed at predetermined intervals along the longitudinal direction, and a core material in which a portion excluding the plurality of groove portions is an annular mountain portion along the circumferential direction;
A screw part is formed at the longitudinal direction end of the outer peripheral part, and an outer cylinder covering the core material;
A cover nut for tightening a screw portion of the outer cylinder;
A water stop member fitted in the groove of the core material;
It is arranged between the outer cylinder and the core material, and sandwiches a pipe between the core material, and ring-shaped convex portions along the circumferential direction on the inner circumference at predetermined intervals along the longitudinal direction. A plurality of protrusions formed in a state where the cover nut is tightened, and the plurality of convex portions are arranged on the radially outer side of the water stop member and on the radially outer side of the peak portion of the core member with the pipe interposed therebetween. ,
A fitting for piping.   The pipe joint according to claim 1, wherein the water stop member is an O-ring.

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