TW201537078A - Pipe joint - Google Patents

Abstract

A pipe joint is provided that suppresses stress concentration generated at a corner part of an outer flange formed at a core material and that can also ensure the degree of strength in an axial direction of the outer flange. Stress concentration generated at a corner part when external force acts in an axial direction and a cross direction can be suppressed by forming a first inclined surface (52) having a recessed arc shape at a corner part formed by an outer peripheral surface of a resin core material (14) and an outer flange (50). A second inclined surface (64) is provided that contacts the first inclined surface (52) at an inner flange (60) of a metal cap nut (54), and when the cap nut (54) is tightly fastened, a second side wall face (61) of the inner flange (60) is contacted against a first side wall face (51) of the outer flange (50) and the second inclined surface (64) is contacted against the first inclined surface (52) of the core material (14). The contact surface area between the inner flange (60) and the outer flange (50) can be increased and the degree of strength in an axial direction of the outer flange (50) can be ensured.

Description

Pipe joint

The present invention relates to a pipe joint.

Use a pipe joint when connecting the pipe to a nipple of the machine. This pipe joint has a pipe joint (see, for example, Patent Document 1). The pipe socket joint comprises: a cylindrical core material, which is connected with a threaded pipe; and a hexagonal cap nut, which fixes the core material to the threaded pipe.

When the pipe socket joint is bolted into the male thread of the threaded pipe, the inner flange of the hexagonal cap nut will press the outer flange of the core material toward the threaded pipe side, and the outer flange is convex inside. The edge is clamped and fixed between the nipple.

The inner flange side of the outer flange is provided with a side wall surface orthogonal to the axial direction, and the flange side of the outer flange is provided with a side wall surface opposite to the outer flange side wall surface, and the hexagonal cover screw is inserted. At the time of the cap, the side wall surface of the outer flange receives the pressing force from the side wall surface of the inner flange.

Prior technical literature

Patent literature

Patent Document 1 Japanese Patent Laid-Open Publication No. 2005-114001

On the other hand, since the outer sleeve is clamped and fixed to the inner flange of the hexagonal cap nut and the nipple, the outer sleeve is applied to the core material in the direction in which the axial direction intersects, and the stress is concentrated outside. The corner of the flange. When the core material is a synthetic resin, it is preferable to suppress stress concentration as much as possible in consideration of durability.

In order to suppress this stress concentration, it is generally thought to form a circular arc surface at the corner portion of the outer flange. However, if the arc surface is increased in consideration of the stress concentration, the flange side wall surface from the inner flange abutting pressure tends to become smaller, and the contact area between the inner flange and the outer flange becomes smaller, and the pressure is concentrated. In one part of the outer flange, the axial strength of the outer flange is reduced.

Although it is also considered to increase the size of the outer flange and the hexagonal cap nut to ensure the contact area between the inner flange and the outer flange, the size of the joint is increased and the cost is also increased. In addition, if the diameter of the core material is to be reduced to ensure the contact area between the inner flange and the outer flange, the inner diameter of the core material is reduced, resulting in a decrease in flow rate.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a pipe joint in which the axial strength of the outer flange can be ensured even if an inclined surface is formed to suppress stress from being concentrated on a corner portion of the flange other than the core material.

The pipe joint according to the first aspect has a core material made of a synthetic resin and formed in a cylindrical shape, and is connected to the pipe body at one end portion in the longitudinal direction; and an annular outer flange is formed at the other end portion of the core material. Radially extending outward; the abutting surface is formed at the outer flange, and includes a first inclined surface disposed at a corner portion of the core material and the outer flange, along the axis When viewed in a cross section, it is inclined with respect to the outer peripheral surface of the core material; and the hexagonal cap nut is provided with a cylindrical portion formed with a female thread portion, and an inner flange from the end portion of the tubular portion to the radial direction The inner side opening has a hole through which the core material is inserted; and the abutting surface abutting against the abutting surface includes a corner portion formed on the inner flange to abut the first inclined surface The second inclined surface.

In the pipe joint of the first aspect, for example, an annular sealing member is disposed between the nipple and the flange formed outside the core member, and the female screw portion of the hex cap nut is screwed to the male thread portion of the nipple for fastening. And connecting the pipe body to the connecting portion provided at the core material, the pipe body and the threaded pipe joint can be connected to each other.

Further, since the abutting surface (including the first inclined surface provided at the corner portion of the outer flange) is formed at the flange outside the joint body, and the flange is provided in the hexagonal cap nut to abut against the outer flange The abutting surface of the abutting surface (including the second inclined surface abutting the first inclined surface of the outer flange), and the inner flange and the outer flange at the time of fastening the hexagonal cap nut can be enlarged Contact area in contact. Therefore, it is possible to suppress the stress concentration occurring at the corner portion of the outer flange, ensure the strength in the direction orthogonal to the axial direction of the core material, and secure the axial strength of the outer flange.

Further, the inclined surface referred to herein is not only a linear inclined surface which is inclined at a constant angle but also a curved inclined surface whose inclination angle gradually changes.

In the second aspect, in the pipe joint of the first aspect, the radial dimension h of the first inclined surface is relative to the radial direction from the outer circumferential surface of the core material to the outer circumferential surface of the outer flange. The radial dimension H of the outer flange is set to 40% or more.

In the pipe joint of the second aspect, the radial dimension h of the first inclined surface is set to 40% or more with respect to the radial dimension H of the outer flange from the outer peripheral surface of the core material to the outer peripheral surface of the outer flange. It is possible to effectively suppress the stress concentration at the time when the axial force acts on the core material in a direction other than the cross direction.

In the third aspect, in the pipe joint of the first aspect or the second aspect, the first inclined surface is a concave arc surface having a radius of curvature r1, and the second inclined surface is a convex arc having a radius of curvature r2 Face, and set to r1=r2

In the pipe joint of the third aspect, since the first inclined surface is a concave circular surface having a curvature radius r1, and the second inclined surface is a convex circular surface having a curvature radius r2, and is set to r1=r2, it becomes a concave circular surface. The first inclined surface and the second inclined surface which is a convex circular arc surface can be completely and surely abutted.

According to a fourth aspect of the invention, in the pipe joint of the first aspect, the abutting surface is provided with a first side wall surface orthogonal to the outer circumferential surface of the core material, and the abutting surface is provided with the first surface The second side wall surface on which the side wall surface abuts.

In the pipe joint of the fourth aspect, the abutting surface is provided with a first side wall surface that is orthogonal to the outer circumferential surface of the core material, and a first inclined surface that is a concave arc surface, and the abutting surface is provided with The second side wall surface on which the side wall surface abuts and the second inclined surface that abuts on the first inclined surface.

Therefore, the first inclined surface and the second inclined surface can be brought into contact with each other, and the first side wall surface and the second side wall surface can be brought into contact with each other.

According to the pipe joint of the present invention described above, the axial strength of the outer flange can be ensured even if an inclined surface is formed to suppress stress from being concentrated on the corner portion of the flange other than the core material.

10‧‧‧ pipe joint

12‧‧‧Connector body

14‧‧‧ core material

16‧‧‧ bushing (connection)

18‧‧‧Intermediate ring (connection)

22‧‧‧O-ring (connection)

24‧‧‧Lock ring (connection)

26‧‧‧ Core Department (Connecting Department)

50‧‧‧Outer flange

51‧‧‧1st side wall surface (abutment surface)

52‧‧‧1st inclined surface (abutment surface)

54‧‧‧Hexagon cap nut

56‧‧‧1st hole

58‧‧‧2nd hole

60‧‧‧ inner flange

61‧‧‧2nd side wall surface (abutted surface)

62‧‧‧Female thread

64‧‧‧2nd inclined surface (abutted surface)

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a cross-sectional view along the axis showing a pipe joint of an embodiment of the present invention.

Fig. 2A is an enlarged cross-sectional view along the axis showing a state in which the inner flange of the hex cap nut is in contact with the outer flange of the core material.

Figure 2B is an enlarged cross-sectional view along the axis showing the inner flange of the hex cap nut and the outer flange of the core material in an detached state.

Fig. 3 is a cross-sectional view along the axis showing a state in which a resin tube and a nipple are connected to a joint of an embodiment of the present invention.

Fig. 4 is a cross-sectional view showing the axis of the abutting surface and the abutting surface of the pipe joint according to the second embodiment.

Fig. 5 is a cross-sectional view showing the axis of the abutting surface and the abutting surface of the pipe joint according to the third embodiment.

[First Embodiment]

The pipe joint 10 according to the first embodiment of the present invention will be described with reference to the drawings.

As shown in FIG. 1, the pipe joint 10 of the present embodiment includes a joint body 12 and a hexagonal cap nut 54.

(joint body)

The joint main body 12 includes a core material 14, a bushing 16, an intermediate ring 18, an engagement releasing member 20, an O-ring 22 as a water stopping member, and a lock ring 24, and these members are arranged such that their central axes coincide with each other. With. Further, in the present embodiment, the core material 14, the bushing 16, the intermediate ring 18, and the engagement releasing member 20 are molded articles of synthetic resin.

The core material 14 is a core portion 26 of the resin tube P into which the connection target can be inserted in the direction of the arrow L. A pair of fitting slots 28 are formed in the outer peripheral surface of the core portion 26, and the O-rings 22 are respectively embedded in the fitting slots 28. When the core portion 26 is inserted into the resin tube P, the O-ring 22 is adhered to the inner circumferential surface of the resin tube P, and the resin tube P and the core material 14 are sealed.

The arrow R direction side of the core member 14 is a large diameter portion 30 formed with a larger diameter with respect to the core portion 26, and the large diameter portion 30 is formed with a groove 32 near the boundary with the core portion 26.

The intermediate ring 18 is disposed on the outer side of the outer peripheral surface of the core material 14 on the side of the arrow L direction.

The end portion of the intermediate ring 18 on the side of the arrow R direction is fitted into the groove 32 of the core material 14 to be fitted, whereby the intermediate ring 18 is fixed to the core material 14.

The hollow cylindrical insertion portion 34 surrounded by the inner circumferential surface of the intermediate ring 18, the outer circumferential surface of the core portion 26, and the end portion of the large diameter portion 30 is set to a size at which the end portion of the resin tube P can be inserted at a constant size.

A bushing engagement portion 36 having an uneven shape is formed on the outer peripheral surface of the intermediate ring 18 in the direction of the arrow R.

The bushing 16 has a substantially cylindrical shape and is disposed outside the outer peripheral surface of the intermediate ring 18 on the side of the arrow L direction.

An uneven-shaped engaged portion 38 that can be fitted to the bushing engagement portion 36 in the direction of the arrow L is formed on the inner circumferential surface of the bushing 16. The bushing engagement portion 36 is fitted to the engaged portion 38 such that the intermediate ring 18 is fixed relative to the bushing 16.

The engaged portion 38 of the bushing 16 is formed with the inclined portion 40 whose inner diameter becomes smaller toward the arrow L direction, the first constant diameter portion 42 having a constant inner diameter, and the inner diameter in the direction of the arrow L direction. The second constant diameter portion 44 having a small diameter is compared to the first constant diameter portion 42.

The lock ring 24 is located on the inner circumferential side of the inclined portion 40 of the bushing 16, and is disposed between the intermediate ring 18 and an engagement releasing member 20 to be described later. The lock ring 24 is provided with an elastically deformable claw portion 24A projecting toward the inner peripheral side at intervals in the circumferential direction, and the imaginary circular diameter of the front end portion of the claw portion 24A is set to be smaller than the outer diameter of the resin tube P. path.

The inner diameter of the engagement releasing member 20 is a slightly cylindrical shape having a large diameter with respect to the outer diameter of the resin pipe P, and is disposed on the inner circumferential side of the bushing 16 so as to be movable along the central axis K1. The engagement releasing member 20 includes a pressing inclined portion 46 for pressing the claw portion 24A toward the arrow R direction side, and a predetermined outer diameter portion 48 for pressing the inclined portion 46 toward the arrow L direction side.

The constant outer diameter portion 48 of the engagement releasing member 20 is formed with a small diameter with respect to the first constant diameter portion 42 of the bushing 16, and is formed with a large diameter with respect to the second constant diameter portion 44, thereby preventing the engagement releasing member 20 from being lining. Set 16 off.

As shown in FIG. 1 and FIG. 2, an annular outer flange 50 extending outward in the radial direction is formed at an end portion of the large diameter portion 30 of the core member 14 in the direction of the arrow R.

As shown in FIG. 2B, a first inclined surface 52 is formed by a corner portion (a base portion of the outer flange 50) formed by the outer circumferential surface of the large diameter portion 30 and the first side wall surface 51 of the outer flange 50.

The first side wall surface 51 of the present embodiment is orthogonal to the axis of the core material 14 when viewed in a cross section along the axial direction of the core material 14. The first inclined surface 52 is cut along the axial direction of the core material 14 When viewed from the surface, the outer peripheral surface of the large-diameter portion 30 and the first side wall surface 51 are smoothly connected to each other in a concave arc shape having a radius r1 of the center of curvature on the radially outer side of the large-diameter portion 30.

Further, the first side wall surface 51 and the first inclined surface 52 of the present embodiment correspond to the abutting surface of the present invention.

(hex cap nut)

As shown in FIGS. 1 and 2, the hexagonal cap nut 54 is formed of a hexagonal columnar metal member. The first hole 56 is formed in the direction of the arrow L direction from the end portion of the axis in the direction of the arrow R, and the second hole 58 having a small diameter with respect to the first hole 56 is formed on the side of the arrow L in the direction of the arrow L of the first hole 56. . The first hole 56 is formed with a female screw 62 from the end portion in the direction of the arrow R toward the bottom of the hole.

The inner diameter of the first hole 56 is set to a size that can be inserted into the flange 50 outside the core material 14. On the other hand, the inner diameter of the second hole 58 is set to be smaller than the outer diameter of the flange 50 outside the core material 14, and is larger than the outer diameter of the large diameter portion 30 of the core material 14. Thereby, the hexagonal cap nut 54 is relatively rotatable relative to the core material 14 and is freely movable in the axial direction.

An annular inner flange 60 extending radially inward from the inner surface of the first hole 56 is formed between the end portion of the hexagonal cap nut 54 on the L-direction side and the bottom of the first hole 56.

The second side wall surface 61 of the inner flange 60 on the side of the first hole 56 (the side in the direction of the arrow R) is viewed in a cross section along the axial direction of the hexagonal cap nut 54 with respect to the axis of the hexagonal cap nut 54. It is orthogonal to the first side wall surface 51 of the outer flange 50 and can be in contact with the first side wall surface 51.

Further, a second inclined surface 64 facing the first inclined surface 52 formed on the core material 14 of the joint main body 12 is formed in the inner corner portion on the side of the first hole 56 (the side in the direction of the arrow R) of the inner flange 60. . The second inclined surface 64 has a convex arc shape having a radius r2 of the center of curvature on the radially inner side of the inner flange 60 when viewed in a cross section along the axial direction. In the present embodiment, the radius r1 of the first inclined surface 52 and the radius r2 of the second inclined surface 64 are set to the same size.

Further, the second side wall surface 61 and the second inclined surface 64 of the present embodiment correspond to the abutted surface of the present invention.

Thereby, the second side wall surface 61 of the inner flange 60 can be abutted against the first side wall surface 5 of the outer flange 50, and the second inclined surface 64 of the inner flange 60 and the outer flange 50 can be made 1 The inclined surface 52 is abutted.

(Effect)

Next, a method of using the pipe joint 10 of the present embodiment will be described.

First, the order of connection of the pipe joint 10 to the nipple 66 of a connection object will be described.

As shown in FIG. 1 , an annular seal 68 is disposed between the flange 50 and the nipple 66 outside the core 14 of the pipe joint 10 , and the female screw 62 of the hex cap nut 54 is screwed to the nipple 66 . Male thread 70 to secure hex cap nut 54.

By tightening the hex cap nut 54, the pipe joint 10 is coupled to the nipple 66. As shown in FIG. 2, the outer flange 50 and the seal 68 are clamped between the inner flange 60 and the nipple 66.

Thereby, the second side wall surface 61 of the inner flange 60 abuts against the first side wall surface 51 of the outer flange 50, and the second inclined surface 64 of the inner flange 60 abuts against the first inclined surface of the outer flange 50. 52.

In the pipe joint 10 of the present embodiment, the arc-shaped first inclined surface 52 is formed at a corner portion formed by the outer peripheral surface of the large-diameter portion 30 and the first side wall surface 51 of the outer flange 50, thereby suppressing the shaft. When a force acting in the direction of the intersection acts on the core material 14, the stress generated at the corner portion is concentrated.

The force in the direction in which the axial direction intersects means, for example, an external force such as a case where a wrench for fastening the hexagonal cap nut 54 adjacent to the other pipe joint 10 is touched, and the resin pipe P may be stretched. Other external forces such as external forces.

Further, in order to effectively suppress the above-described stress concentration, as shown in Fig. 2B, the height dimension of the flange 50 is H when measured along the radial direction from the outer peripheral surface of the large diameter portion 30 to the outer peripheral surface of the outer flange 50. When the radial dimension of the first inclined surface 52 measured in the radial direction is also h, h is preferably 40% or more of H.

Further, in the pipe joint 10 of the present embodiment, the second inclined surface 64 of the inner flange 60 is brought into contact with the first inclined surface 52 of the outer flange 50, and the second side wall surface 61 of the inner flange 60 is brought into contact with each other. The first side wall surface 51 of the outer flange 50 can increase the contact area between the outer flange 50 and the inner flange 60.

Therefore, the first inclined surface 52 is formed in the corner portion of the outer flange 50. However, when the hexagonal cap nut 54 is tightened, the inner side of the flange portion on the inner flange side of the outer flange 50 can be received. The pressure of the rim 60 does not concentrate on one of the outer flanges 50, but ensures the axial strength of the outer flange.

In the pipe joint 10 of the present embodiment, since the first inclined surface 52 and the second inclined surface 64 have a simple arc shape, the first inclined surface 52 and the second inclined surface 64 are easily formed, and the first inclined surface 52 and the first inclined surface 52 are formed. The size of the inclined surface 64 is also good, and the first inclined surface 52 and the second inclined surface 64 can be reliably contacted.

Finally, the order of connection of the pipe joint 10 to the resin pipe P of another connection object will be described.

The resin tube P is inserted into the insertion portion 34 of the joint main body 12, and the end portion of the resin tube P is brought into contact with the end portion of the large diameter portion 30. By inserting the resin tube P into the insertion portion 34, the claw portion 24A of the lock ring 24 is pressed by the resin tube P, and the front end portion of the claw portion 24A is hooked over the outer peripheral surface of the resin tube P to prevent the resin tube P from being taken off. Pulling out makes the resin tube P surely connected to the pipe joint 10. In addition, when the resin pipe P is connected to the joint main body 12, the O-ring 22 of the core material 14 is in close contact with the inner peripheral surface of the resin pipe P, and the sealing property between the resin pipe P and the core material 14 can be ensured.

[Second Embodiment]

Next, a pipe joint 10 according to a second embodiment of the present invention will be described with reference to Fig. 4 . In the first embodiment, the same components are denoted by the same reference numerals, and the description thereof will be omitted.

In the first embodiment, the first inclined surface 52 has a concave arc shape having a radius r1 of the center of curvature on the radially outer side of the large diameter portion 30. However, the present invention is not limited thereto, and may be larger than the large diameter shown in FIG. The outer circumferential surface of the portion 30 and the first side wall surface 51 are inclined at a constant angle. In this case, the second inclined surface 64 of the hexagonal cap nut 54 is in contact with the first inclined surface 52.

[Third embodiment]

Next, a pipe joint 10 according to a third embodiment of the present invention will be described with reference to Fig. 5 . In the first embodiment, the same components are denoted by the same reference numerals, and the description thereof will be omitted.

As shown in FIG. 5, the first inclined surface 52 may be configured to include an arcuate surface 52A and a linear inclined surface 52B that is inclined at a constant angle. In this case, the second inclined surface 64 of the hexagonal cap nut 54 has a shape that abuts against the first inclined surface 52 including the circular arc surface 52A and the inclined surface 52B.

Further, although not shown, the first inclined surface 52 may have a curved shape in which a plurality of concave arc shapes having different curvature radii are connected, or may be a plurality of linear inclined surfaces having different inclination angles (individually a certain angle) ) to be connected.

(Other embodiments)

The embodiments of the present invention have been described above with reference to the embodiments. However, these embodiments are merely examples, and various modifications can be made without departing from the scope of the invention. Further, the scope of the present invention is of course not limited to the embodiments.

In the above embodiment, the first side wall surface 51 and the first inclined surface 52 are formed on the inner flange side of the flange 50 other than the core material 14. However, the present invention is not limited thereto, and the inner flange side of the outer flange 50 is provided. The first side wall surface 51 that is orthogonal to the axial direction may be omitted, and the inner flange side may be the first inclined surface 52. In this case, the inner flange 60 of the hexagonal cap nut 54 is such that all of the outer flange sides are the second inclined faces 64.

In the above embodiment, the radius r1 of the first inclined surface 52 and the radius r2 of the second inclined surface 64 are matched, but the first inclined surface 52 and the second inclined surface 64 may be used when the hexagonal cap nut 54 is tightened. It is sufficient to contact, even if the radius r1 and the radius r2 do not completely match due to manufacturing errors or the like.

10‧‧‧ pipe joint

12‧‧‧Connector body

14‧‧‧ core material

16‧‧‧ bushing (connection)

18‧‧‧Intermediate ring (connection)

20‧‧‧Snap release component

22‧‧‧O-ring (connection)

24‧‧‧Lock ring (connection)

24A‧‧‧ claws

26‧‧‧ Core Department (Connecting Department)

28‧‧‧ embedded slots

30‧‧‧Great Path Department

32‧‧‧ slots

34‧‧‧tube insertion

36‧‧‧ bushing engagement

38‧‧‧The Department of Engagement

40‧‧‧ inclined section

42‧‧‧1st fixed diameter

44‧‧‧2nd fixed diameter

46‧‧‧Resist the slope

48‧‧‧A certain outer diameter part

50‧‧‧Outer flange

54‧‧‧Hexagon cap nut

60‧‧‧ inner flange

62‧‧‧Female thread

64‧‧‧2nd inclined surface (abutted surface)

66‧‧‧Threaded take over

68‧‧‧Seal

P‧‧‧resin tube

Claims (4)

A pipe joint comprising: a synthetic resin core material formed in a cylindrical shape and connected to a pipe body at one end portion in the longitudinal direction; and an annular outer flange formed on the other end portion of the core material and extending radially outward The abutting surface is formed on the outer flange and includes a first inclined surface which is disposed at a corner portion of the core material and the outer flange, and has a cross section along the axial direction. When viewed, the outer peripheral surface of the core material is inclined; and the hexagonal cap nut is provided with a tubular portion formed with a female screw portion, and an inner flange that is radially inwardly disposed from an end portion of the tubular portion. a hole having the core material inserted therein; and the abutting surface abutting against the abutting surface includes a second inclined surface formed at a corner portion of the inner flange and abutting against the first inclined surface surface. The pipe joint of claim 1, wherein the radial dimension h of the first inclined surface is relative to the outer flange along a radial direction from the outer circumferential surface of the core material to the outer circumferential surface of the outer flange The radial dimension H is set to 40% or more. The pipe joint of claim 1 or 2, wherein the first inclined surface is a concave arc surface having a radius of curvature r1, and the second inclined surface is a convex arc surface having a radius of curvature r2, and is set to r1=r2 . The pipe joint according to claim 1, wherein the abutting surface is provided with a first side wall surface orthogonal to a peripheral surface of the core material, and the abutting surface is provided to be opposite to the first side wall surface Connect to the second side wall surface.