JP6407611B2 - Pipe fitting - Google Patents

Description

  The present invention relates to a pipe joint.

  The following Patent Document 1 discloses a pipe joint. This pipe joint is made of a metal pipe that is screwed into the pipe body, a resin pipe that is integrally formed with the metal pipe and that can be connected to other pipe bodies, and a torque for screwing the metal pipe into the pipe body is input and integrated with the resin pipe. And a formed hexagonal portion. A tool such as a monkey wrench is used to screw the pipe joint into the pipe body.

JP 2014-95410 A

  However, if the metal pipe of the above pipe joint is replaced with a resin pipe and all pipe connecting parts and hexagonal parts are made of resin and are integrally injection-molded, excessive torque is input from the tool to the hexagonal part. When it is done, there is a possibility that stress that causes breakage is generated in the pipe connecting portion.

  In the injection molded product of the resin containing the reinforcing material, the weakest portion is a so-called weld portion where the molten resin joins and fuses in the mold, and the reinforcing material is unidirectional in the weld portion. When aligned (orientated), cracks are likely to occur along the alignment direction.

  In view of the above fact, an object of the present invention is to suppress the occurrence of cracks in a resin pipe joint in which a reinforcing material is blended.

The pipe joint according to claim 1 is a threaded portion for connecting a tubular body, a torque input portion provided at one end in the axial direction of the threaded portion for inputting torque to the threaded portion, and the shaft from the torque input portion. A tube connecting portion extending in the direction opposite to the screw portion and having an inner diameter smaller than the inner diameter of the screw portion, and an inner peripheral surface at the position of the torque input portion from the screw portion side to the tube A taper surface whose inner diameter gradually decreases toward the body connection portion side, and is provided in a tubular main body portion formed of a resin mixed with a reinforcing material , and a weld portion in the tapered surface of the main body portion, and the reinforcing material Has an irregular orientation region that is irregularly oriented in the resin and extends from the torque input portion toward the tube connecting portion along the axial direction of the main body portion .

In this pipe joint, the inner peripheral surface at the position of the torque input portion is a tapered surface whose inner diameter gradually decreases from the threaded portion side to the tube connecting portion side, and an irregularly oriented region is provided in the weld portion of the tapered surface. In the weld portion, the reinforcing material is not oriented in one direction. Therefore, compared with the case where the reinforcing material is oriented in one direction, the strength of the welded portion is improved, and the welded portion is unlikely to become a starting point of cracking. For this reason, crack generation can be suppressed in a resin pipe joint in which a reinforcing material is blended.
Moreover, in this pipe joint, since the irregularly oriented region extends along the axial direction of the main body portion, it is possible to prevent the crack from progressing in the axial direction.
Further, in this pipe joint, since the irregular orientation region extends from the torque input part to the tube connecting part side, when torque is input to the torque input part, the torque input part and its torque input part The occurrence of cracks in the vicinity can be suppressed.

According to a second aspect of the present invention, in the pipe joint according to the first aspect , a gate mark which is a mark of an injection position of the resin is formed on an outer periphery of the main body portion, and the irregularly oriented region is formed of the gate mark. On the other hand, it is located on the diametrically opposite side of the main body.

  A weld portion is generally formed on the opposite side of the main body portion in the diameter direction with respect to the gate mark. In this pipe joint, since the irregularly oriented region is located on the diametrically opposite side of the main body portion with respect to the gate mark, the occurrence of cracks starting from the weld portion can be suppressed.

According to a third aspect of the present invention, in the pipe joint according to the first or second aspect , the resin is polyphenylene sulfide.

  In this pipe joint, even if the resin is polyphenylene sulfide having low toughness, the occurrence of cracks can be suppressed. In other words, the effect of preventing the fracture of the pipe joint by suppressing the occurrence of cracks is particularly effective for materials with low toughness.

According to a fourth aspect of the present invention, in the pipe joint according to any one of the first to third aspects, the reinforcing material is a glass fiber.

  In this pipe joint, since the reinforcing material is glass fiber, the tensile strength and bending strength of the pipe joint can be increased, and elongation can be suppressed.

  According to the pipe joint according to the present invention, it is possible to obtain an excellent effect that cracks can be suppressed in a resin pipe joint in which a reinforcing material is blended.

It is a partial fracture perspective view showing a pipe joint concerning this embodiment. It is sectional drawing which shows the pipe joint which concerns on this embodiment. It is an expanded sectional view which shows typically the row of the reinforcing material in the inner peripheral part near a weld part. It is an electron micrograph which shows an example of the arrangement | sequence of the reinforcing material in the inner peripheral part of the weld part vicinity. The width of the photo is 1 mm. It is an electron micrograph which shows an example of the arrangement | sequence of the reinforcing material in the inner peripheral part of the weld part vicinity. The width of the photo is 1 mm. It is an electron micrograph which shows an example of the arrangement | sequence of the reinforcing material in the inner peripheral part of the weld part vicinity. The width of the photo is 1 mm. It is an electron micrograph which shows an example of the arrangement | sequence of the reinforcing material in the inner peripheral part of the weld part vicinity. The width of the photo is 1 mm. It is an electron micrograph which shows an example of the arrangement | sequence of the reinforcing material in the inner peripheral part of the weld part vicinity. The width of the photo is 1 mm. It is an electron micrograph which shows an example of the arrangement | sequence of the reinforcing material in the inner peripheral part of the weld part vicinity. The width of the photo is 1 mm.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. 1 and 2, the pipe joint 10 according to the present embodiment includes a tubular main body 12 and an irregularly oriented region A. The inside of the main body portion 12 penetrates in the axial direction S of the main body portion 12. The pipe joint 10 is configured by combining the main body 12 and various parts not shown.

  The main body 12 is a member molded from a resin in which the reinforcing material 18 (FIG. 3) is blended. This resin is, for example, polyphenylene sulfide. The reinforcing material 18 is, for example, glass fiber. Note that the reinforcing member 18 in FIG. 3 is drawn with an exaggerated size compared to the actual size.

  The irregular orientation region A is provided in, for example, the inner peripheral portion 42 of the weld portion W in the main body portion 12. The weld portion W is a portion where molten resin joins and is fused in a mold (not shown). In the irregular orientation region A, the reinforcing material 18 is irregularly oriented in the resin. The irregularly oriented region A extends along the axial direction S of the main body 12.

  In the present embodiment, the inner peripheral portion 42 includes an inner peripheral surface and a portion radially outward from the inner peripheral surface, that is, the inside of the main body portion 12. In regions other than the weld portion W, the flow of the resin at the time of molding becomes irregular, and the orientation of the reinforcing material 18 becomes small. That is, the general region B (FIG. 3) other than the weld portion W is basically an irregularly oriented region. Therefore, the irregular orientation region A is provided in the weld portion W. In other words, the reinforcing members 18 are irregularly arranged in the weld portion W, and the orientation is the same as in the general region B other than the weld portion W. Means low. The irregularly oriented region A is desirably provided not only on the inner peripheral portion 42 of the weld portion W but also on the outer peripheral portion.

  The main body portion 12 is opposite to the screw portion 20 for connecting the tube body, the torque input portion 14 for inputting torque to the screw portion 20, and the screw portion 20 in the axial direction S of the main body portion 12 from the torque input portion 14. It has the tube connection part 17 extended in the side. The torque input part 14 is the thickest part in the main body part 12. Therefore, a resin injection position (gate) of a mold (not shown) is provided at a position corresponding to the torque input unit 14. A gate mark 22 corresponding to the resin injection position is formed in the torque input portion 14. The gate mark 22 may not be clear in terms of the appearance of the torque input unit 14. The position of the weld portion W can be estimated from the shape of the main body portion 12 and the position of the gate mark 22. The weld W is located on the opposite side of the main body 12 in the diameter direction with respect to the gate mark 22.

  A recess 15 that is recessed in the radial direction of the main body 12 is provided on the outer periphery of the torque input unit 14. The concave portion 15 is a long groove having the circumferential direction of the torque input portion 14 as a longitudinal direction and the axial direction S of the main body portion 12 as a short direction. When torque is input to the torque input unit 14 by a tool, the corners of the torque input unit 14 are crushed by the tool before the weld portion W and the screw portion 20 are cracked.

  The tube connection portion 17 is provided in order from the torque input portion 14 toward the end portion 24 opposite to the screw portion 20, for example, the intermediate thick portion 16, the cylindrical portion 26, the taper portion 28, and the positioning portion 30. The insertion portion 32, the groove portion 34, the groove portion 36, and the insertion portion 38 are all smaller in cross-sectional area than the torque input portion 14.

  The insertion portions 32 and 38 are portions where pipes (not shown) are inserted from the end portion 24 side and are actually connected, and the outer diameters are equal to each other. The outer diameter of the positioning portion 30 is set to be larger than the outer diameter of the insertion portion 32, and the tubular body can be inserted up to the positioning portion 30. O-rings (not shown) are fitted in the grooves 34 and 36. With this O-ring, airtightness or watertightness between the tube inserted into the insertion portions 32 and 38 and the insertion portions 32 and 38 is ensured.

  The intermediate thick portion 16 is formed in a portion of the main body portion 12 where the cross-sectional area decreases from the torque input portion 14 to the tube connection portion 17. It has a cross-sectional area larger than 26. The intermediate thick portion 16 is formed integrally with the main body portion 12 and is located between the torque input portion 14 and the cylindrical portion 26. Further, the intermediate thick portion 16 is formed continuously in the axial direction S of the torque input portion 14. An inner peripheral surface 40 from the torque input portion 14 to the intermediate thick portion 16, the cylindrical portion 26, and the tapered portion 28 is a tapered surface that gradually decreases in diameter.

  The irregular orientation region A extends from the torque input portion 14 to the opposite side of the screw portion 20 in the axial direction S of the main body portion 12.

(Function)
This embodiment is configured as described above, and the operation thereof will be described below. 1 and 2, in the pipe joint 10 according to the present embodiment, the irregularly oriented region A is provided in the weld portion W, and the reinforcing member 18 is not oriented in one direction at the weld portion W. Therefore, compared with the case where the reinforcing material 18 is oriented in one direction, the strength of the weld portion W is improved, and the weld portion W is unlikely to become a starting point of cracking.

  Specifically, a weld portion W is generally formed on the opposite side in the diameter direction of the main body portion 12 with respect to the gate mark 22 formed in the torque input portion 14. In the pipe joint 10 according to the present embodiment, since the irregularly oriented region A is located on the opposite side in the diameter direction of the main body 12 with respect to the gate mark 22, crack generation starting from the weld W is suppressed. be able to. Further, since the irregularly oriented region A extends along the axial direction S of the main body portion 12, it is possible to suppress the crack from progressing in the axial direction S.

  Further, in the present embodiment, the irregularly oriented region A extends from the torque input portion 14 to the tube connecting portion 17 side opposite to the screw portion 20 in the axial direction S of the main body portion 12. When torque is input to the input unit 14, it is possible to suppress the occurrence of cracks in the torque input unit 14 and the vicinity thereof.

  Thus, according to the present embodiment, cracks can be suppressed in the resin pipe joint 10 in which the reinforcing material 18 is blended.

  Moreover, in this embodiment, even if resin is polyphenylene sulfide with low toughness, crack generation can be suppressed. In other words, the effect of preventing the fracture of the pipe joint 10 by suppressing the occurrence of cracks is particularly effective for a material with low toughness.

  Furthermore, in this embodiment, since the reinforcing material 18 is a glass fiber, the tensile strength and bending strength of the pipe joint 10 can be increased, and elongation can be suppressed.

[Other Embodiments]

  As mentioned above, although an example of embodiment of this invention was demonstrated, embodiment of this invention is not limited above, In addition to the above, in a range which does not deviate from the main point, it can implement variously. Of course there is.

  For example, although the irregularly oriented region A is assumed to extend along the axial direction S of the main body 12, the extending direction of the irregularly oriented region A may be different from the axial direction S.

  In addition, the irregularly oriented region A is located on the opposite side of the main body 12 in the diameter direction with respect to the gate mark 22, but if the weld portion W is not in this position, the irregular orientation region A is aligned with the weld portion W. An irregular orientation region A is provided.

  Although the main body portion 12 has the screw portion 20 and the torque input portion 14, the main body portion 12 may have a structure that does not have these.

  Although the resin constituting the main body 12 is polyphenylene sulfide, the type of resin is not limited to this.

  Although the reinforcing material 18 is glass fiber, the type of the reinforcing material 18 is not limited to this, and various materials used for resin reinforcement, such as carbon fiber, can be used.

  4 to 9 are electron micrographs showing the arrangement of the reinforcing materials in the inner periphery near the weld. The width of the photo is 1 mm. The vertical direction at the center of the width direction in each figure corresponds to the weld portion. A number of short fiber portions are reinforcing materials. “T” described in each figure is a numerical value of the breaking torque when a torque is input to the torque input portion and a crack occurs in the pipe joint. 4 to 9 are arranged in order from the smallest breaking torque T. FIG. The values of the breaking torque T are 47.3 N · m in FIG. 4, 48 N · m in FIG. 5, 48.3 N · m in FIG. 6, 49.9 N · m in FIG. 7, 51.5 N · m in FIG. FIG. 9 shows 54.3 N · m.

  From these figures, it can be seen that the breaking torque T increases as the orientation of the reinforcing material at the weld portion decreases.

DESCRIPTION OF SYMBOLS 10 Pipe joint 12 Main-body part 14 Torque input part 17 Tubular connection part 18 Reinforcement material 22 Gate trace A Irregularly oriented area S Axial direction W Weld part

Claims (4)

A threaded portion for connecting a tubular body, a torque input portion provided at one end in the axial direction of the threaded portion for inputting torque to the threaded portion, and on the side opposite to the threaded portion in the axial direction from the torque input portion A tube connecting portion that extends and has an inner diameter smaller than the inner diameter of the threaded portion, and the inner peripheral surface of the torque input portion is gradually reduced from the threaded portion side to the tube connecting portion side. A tapered main body, a tubular main body molded with a resin containing a reinforcing material,
Provided in the weld portion of the tapered surface of the main body portion, the reinforcing material is irregularly oriented in the resin, and extends from the torque input portion to the tube connection portion side along the axial direction of the main body portion. An irregularly oriented region present ;
Pipe fittings with On the outer periphery of the main body, a gate mark that is a mark of the injection position of the resin is formed,
The pipe joint according to claim 1 , wherein the irregularly oriented region is located on a diametrically opposite side of the main body portion with respect to the gate mark. The pipe joint according to claim 1 or 2 , wherein the resin is polyphenylene sulfide. The pipe joint according to any one of claims 1 to 3 , wherein the reinforcing material is glass fiber.