WO2016021420A1

WO2016021420A1 - Pipe joint member

Info

Publication number: WO2016021420A1
Application number: PCT/JP2015/070995
Authority: WO
Inventors: 建郎飯塚
Original assignee: 株式会社ブリヂストン
Priority date: 2014-08-04
Filing date: 2015-07-23
Publication date: 2016-02-11
Also published as: JP2016035313A; TW201615754A; JP6838852B2

Abstract

A pipe joint member, of which at least one part comprises a resin material including: a polyphenylene sulphide resin; and 35-45 mass% glass fibres.

Description

Pipe fitting

The present invention relates to a pipe joint member.

Japanese Unexamined Patent Application Publication No. 2005-256914 discloses a pipe joint member. This pipe joint member is a pipe joint comprising a joint body having a fluid passage and a pipe insertion port, and a cap for supporting the pipe holding member, both of which are referred to as polyphenylene sulfide resin (hereinafter referred to as “PPS resin”). ). Japanese Patent Application Laid-Open No. 2005-256914 discloses that 30% by weight to 50% by weight of glass fiber is blended with PPS resin.

If at least a part of the pipe joint member is made of resin, weight reduction of the pipe joint member can be expected. On the other hand, a resin member is inferior in strength compared to a metal member. For this reason, for example, there is a concern that the pipe joint member may be broken (for example, cracked or the like) at the time of connection with the water tool.

In this respect, in order to increase the strength and suppress the breakage of the pipe joint member, the resin material in which the glass fiber is blended with the PPS resin is an effective material. As described above, Japanese Patent Application Laid-Open No. 2005-256914 discloses that glass fiber is blended in PPS resin at 30 wt% to 50 wt%.

However, Japanese Patent Application Laid-Open No. 2005-256914 discloses that 30% by weight to 50% by weight of glass fiber is added to the PPS resin, but the normal amount of glass fiber as a reinforcing material is merely described. It is only shown. In other words, Japanese Patent Application Laid-Open No. 2005-256914 only shows the range of the glass fiber blending amount as a general range, and shows the glass fiber blending amount that has been sufficiently studied from the viewpoint of fracture strength. It has not been done.

Against this background, the recent demand level for the fracture resistance of pipe joint members accompanying resinization has been increasing, and further studies are currently required.

Therefore, an object of the present invention is to provide a pipe joint member that further improves the fracture resistance of a portion made of a resin material containing PPS resin and glass fiber.

The above problem can be solved by the following means.

A pipe joint member, at least a part of which is made of a resin material containing polyphenylene sulfide resin and 35% by mass to 45% by mass glass fiber.

According to the present invention, it is possible to provide a pipe joint member in which the fracture resistance of a portion made of a resin material containing PPS resin and glass fiber is further improved.

It is the half cut sectional view seen from the diameter direction of the pipe joint member concerning an embodiment of the invention. FIG. 2 is a cross-sectional view of the pipe joint member taken along the line AA shown in FIG. 1 viewed from the axial direction. It is a perspective view of the pipe joint member shown by FIG.

Hereinafter, the details of the pipe joint member of the present invention will be described.
In the present specification, the numerical range indicated by “to” indicates a range in which the numerical values described before and after the numerical value are the minimum value and the maximum value, respectively.

The pipe joint member of the present invention is a resin material (hereinafter also referred to as “specific resin material”) including at least a part of polyphenylene sulfide resin (PPS resin) and glass fiber of 35% by mass to 45% by mass. It is configured.

In the pipe joint member of the present invention, the above structure further improves the fracture resistance of the part made of the resin material. This reason is presumed to be as follows.

First, PPS resin is a resin having high fracture strength, excellent in creep deformation resistance, heat resistance and chemical resistance. When glass fiber is blended at 35% by mass with this PPS resin, the breaking strength increases. This is because, as a general knowledge, the blending amount of the glass fiber as the reinforcing material is proportional to the breaking strength.

On the other hand, the inventor of the present application has found that, unlike general knowledge, when the PPS resin contains an excessive amount of glass fiber at around 50% by mass, the fracture strength decreases. This is presumed as follows.
When glass fiber is injection-molded with PPS resin, the reinforcing effect of the glass fiber is reduced with respect to the load in the direction orthogonal to the orientation direction in the orientation portion where the glass fiber is oriented. The tendency to depend on strength increases. And when glass fiber exists excessively in this orientation part, the amount of PPS resin will decrease and the joint area of PPS resin will fall. For this reason, when glass fiber is included excessively in PPS resin, it is estimated that fracture strength falls.

On the other hand, the inventor of the present application has found that the breaking strength is increased when the glass fiber is added to the PPS resin at 45 mass% or less. This is presumed that when the compounding amount of the glass fiber is reduced to 45% by mass or less, the influence of the decrease in the bonding strength between the PPS resins is suppressed, and the breaking strength is increased.

From the above, it is presumed that the pipe joint member of the present invention further improves the fracture resistance of the part made of the resin material.

Hereinafter, the specific resin material constituting at least a part of the pipe joint member of the present invention will be described.

The specific resin material includes PPS resin and glass fiber. The specific resin material may contain other additives as necessary.

The PPS resin is a polymer containing a repeating unit of -S-Ph- (where Ph represents a phenylene group).

Examples of the PPS resin include linear (linear) PPS resins and cross-linked PPS resins. The PPS resin is preferably a linear (linear) PPS resin from the viewpoint of increasing the toughness of the pipe joint member and improving the fracture strength.
The cross-linked PPS resin is, for example, a PPS resin in which a phenylene group of a linear (linear) PPS resin is cross-linked through a single bond or an ether bond.

The specific resin material may include a resin other than the PPS resin in a range of 5% by mass or less based on the entire resin component.

The glass fiber is preferably subjected to various surface treatments from the viewpoint of improving the adhesion with the PPS resin. When the adhesion between the glass fiber and the PPS resin is improved, the reinforcing effect can be enhanced.

The glass fiber may be a short fiber or a long fiber, but a short fiber is preferable from the viewpoint of improving the fracture strength of the pipe joint member. When the glass fiber is a short fiber, the orientation of the glass fiber is suppressed, and the glass fiber is less likely to be irregularly oriented in the resin. Thereby, the breaking strength of the pipe joint member is easily improved.

When the glass fiber is a short fiber, the fiber length of the glass fiber is preferably, for example, 100 μm to 700 μm, and more preferably 100 μm to 400 μm. The fiber diameter of the glass fiber is, for example, preferably 5.0 μm to 9.5 μm, more preferably 7.5 μm to 9.5 μm.
The fiber length and the fiber diameter of the glass fiber are the arithmetic average values measured for 100 glass fibers by microscopic observation. When the fiber has a flat shape or the like, the fiber diameter is (maximum diameter + minimum diameter) / 2.

The content of glass fiber is 35% by mass to 45% by mass, and 37% by mass to 43% by mass is preferable from the viewpoint of improving the fracture strength of the pipe joint member. In addition, content of glass fiber is a ratio with respect to the whole specific resin material.

Examples of other additives include known additives for resin moldings such as fillers (fillers excluding glass fibers), lubricants, antistatic agents, surfactants, ultraviolet absorbers, antioxidants, flame retardants, and the like. Can be mentioned.

In the pipe joint member of the present invention, the portion made of the specific resin material is preferably formed by, for example, molding, particularly injection molding. Even if it is injection-molded, the breaking strength at the oriented portion increases as described above by applying the specific resin material.
The specific resin material is obtained, for example, by kneading the PPS resin and glass fiber with a kneader or the like.

The pipe joint member of the present invention may be at least partially made of a specific resin material, but the entire pipe joint member is made of a specific resin material (that is, the entire pipe joint member is made of a specific resin material). It is preferable to be molded integrally.

Next, the structure of the pipe joint member of the present invention will be described.
As the pipe joint member of the present invention, for example, a pipe joint member main body, a threaded portion provided at one axial end portion of the pipe joint member main body, and an axial intermediate portion of the pipe joint member main body are input with torque. Preferably, a pipe joint member provided with a polygonal torque input section having a plurality of tool contact surfaces in the circumferential direction. And at least one part of the pipe joint member of this structure is comprised with a specific resin material.
In addition, the pipe joint member of this invention may be provided in the axial direction other end part of the pipe joint member main body, and may be provided with the connection part connected to a pipe body.

In the pipe joint member of this structure, for example, torque is input to the torque input part by a tool such as a monkey wrench in order to screw the thread part into the pipe body. The pipe joint member of this structure used in this way is required to have a breaking strength (particularly, tightening strength) as compared with pipe joint members of other structures. For this reason, it is preferable that at least a part of the pipe joint member of this structure is made of a specific resin material, because the fracture resistance (particularly, the tightening strength) is improved.

As described above, since the torque is input to the torque input portion of the pipe joint member of this structure, the portion provided around the torque input portion is easily damaged. Specifically, for example, the portion of the pipe joint member main body provided with the screw portion (particularly, the portion of the pipe joint member main body on the torque input portion side provided with the screw portion) is easily damaged. For this reason, from the point of improving the breaking strength of the part provided around the torque input part, the torque input part and the part provided around the torque input part may be integrally formed of a specific resin material. More specifically, it is more preferable that the pipe joint member main body, the screw portion, and the torque input portion are integrally formed of a specific resin material.

When the pipe joint member of this structure includes a connection part, the part of the pipe joint member main body provided with the connection part (particularly, the part of the pipe joint member main body on the torque input part side provided with the connection part) is easily damaged. In particular, a portion of the pipe joint member main body provided with a connection portion that is often configured with a thinner portion than other portions (for example, a portion of the pipe joint member main body on the torque input portion side provided with the connection portion). Easy to break. For this reason, from the point which improves the breaking strength of the site | part provided around a torque input part, a pipe joint member main body, a thread part, and a connection part (especially the pipe joint member by the side of the torque input part in which the connection part was provided) It is preferable that the main body part) and the torque input portion are integrally formed of a specific resin material.

The pipe joint member of this structure can make a thread part into a taper-shaped male thread part. The tapered male threaded portion has a shape that gradually decreases in diameter toward the outside in the axial direction of the pipe joint member main body.
Here, when the threaded portion is a tapered male threaded portion, if the pipe joint member of this structure has a connecting portion, when torque is input to the torque input portion, the stress generated in the radial direction of the threaded portion is reduced. It propagates to the connecting portion (particularly, the portion on the torque input portion side of the connecting portion that comes into contact with the tubular body), and the connecting portion is easily damaged. Even in this case, the fracture strength is improved by configuring the portion of the pipe joint member main body provided with the connection portion (particularly the pipe joint member main body portion on the torque input portion side provided with the connection portion) with a specific resin material. Thus, breakage of the connection portion is suppressed.

Next, a pipe joint member according to the present embodiment which is an example of the pipe joint member of the present invention will be described with reference to the drawings. In addition, in the figure, code | symbol Ac shown suitably shows the axial direction of a pipe joint member, and code | symbol Ca has shown the radial direction which goes to an outer periphery from the axial center of a pipe joint member.

(Configuration of pipe joint member)
As shown in FIGS. 1 to 3, the pipe joint member 10 according to the present embodiment includes a pipe joint member body 10A formed of a specific resin material. The pipe joint member main body 10A includes a first pipe connecting part 12, a torque input part 14, and a second pipe connecting part 16 that are sequentially arranged along the axial direction Ac. In other words, the first pipe connecting portion 12 is provided at one end portion in the axial direction Ac of the pipe joint member main body 10A, and the second pipe connecting portion 16 is provided at the other end portion in the axial direction Ac. A torque input portion 14 is provided at an intermediate portion in the axial direction Ac of the pipe joint member main body 10A. The pipe joint member 10 connects the first tubular body 20 indicated by a one-dot chain line as a tubular body and the second tubular body 22 indicated by a two-dot chain line as a tubular body in FIG. It is configured as a flow path for fluid flowing between 20 and the second tubular body 22. Examples of the fluid include liquids such as water, hot water, oil, and chemicals, and gases such as air and gas. In the present embodiment, the axial direction Ac is a straight line. For example, the axial direction of an elbow-shaped, cheese-shaped, or curved-shaped pipe joint member is bent, branched, or curved. Pipe joint members having these shapes and axial directions are included in the pipe joint member 10 according to the present invention. Further, the first tubular body 20 is not limited to a tubular body such as a metal tube. The first pipe body 20 includes other joints, faucet devices, watering devices, hot water heaters, and other members that are connected in the construction of general water supply and hot water supply piping.

In the present embodiment, since the pipe joint member main body 10A is formed of a specific resin material, naturally, the first pipe connection portion 12, the torque input portion 14, and the second pipe connection portion 16 are formed of a specific resin material. Yes. If it demonstrates in detail, the 1st pipe | tube connection part 12, the torque input part 14, and the 2nd pipe | tube connection part 16 will be integrally shape | molded by the shaping | molding method using the resin molding die.

The 1st pipe connection part 12 of the pipe joint member 10 is made into the hollow cylinder shape. The tube interior 12A of the first tube connection portion 12 is configured as a flow path for flowing fluid in the axial direction, and the outer peripheral portion of the first tube connection portion 12 is a screw portion 12B that is screwed into the first tube body 20 (see FIG. 1). It is said that. The screw portion 12B is slightly increased in diameter from the first tubular body 20 side toward the torque input portion 14 side, and is configured by a tapered screw.

The torque input portion 14 is provided on the opposite side of the first tube connecting portion 12 from the first tube body 20 side, and has a hollow polygonal cylindrical shape in which the axis of the first tube connecting portion 12 is aligned with the axis. ing. The tube interior 14A of the torque input unit 14 is communicated with the tube interior 12A of the first tube coupling unit 12 and is configured as a fluid flow path. Further, the pipe interior 14A has a tapered shape with a diameter reduced from the first pipe connecting part 12 side toward the second pipe connecting part 16 side. A plurality of tool contact surfaces 14 </ b> B are provided on the outer periphery of the torque input unit 14 along the circumferential direction to which a torque for twisting the first tube coupling unit 12 into the first tube body 20 is input by a tool. In the present embodiment, the tool contact surface 14B is configured as a rectangular surface having the circumferential direction as the longitudinal direction and the axial direction Ac as the short direction, and six are arranged in the circumferential direction. As shown in FIG. 2 and FIG. 3, the contour shape of the torque input portion 14 is formed in a hexagonal shape when viewed from the axial direction Ac, similarly to the contour shape of the hex nut and the contour shape of the hex bolt head.

A corner portion 14C is provided between one tool contact surface 14B and another tool contact surface 14B adjacent in the circumferential direction, and at the circumferential end of the tool contact surface 14B. As shown in FIG. 2, the inner angle α of the corner portion 14C is set to 120 degrees here. Further, as shown in FIGS. 1 and 3, chamfered portions 14D are provided at both ends in the axial direction Ac of the corner portion 14C.

As shown in FIGS. 1 and 3, the second pipe connecting portion 16 is provided on the opposite side of the torque input portion 14 from the first pipe connecting portion 12 side, and the shaft core and the shaft core of the torque input portion 14 are provided. It is made into the hollow cylinder shape made to correspond. The pipe inner portion 16A on the torque input portion 14 side of the second pipe connecting portion 16 communicates with the pipe inner portion 14A of the torque input portion 14, and has a tapered shape that is continuously reduced in diameter to the pipe inner portion 14A. The pipe interior 16B located in the middle part of the second pipe connecting part 16 in the axial direction Ac is communicated with the pipe interior 16A and has the same diameter along the axial direction Ac. The tube interior 16C on the second tube body 22 side of the second tube connection portion 16 is in communication with the tube interior 16B and has a tapered shape with a diameter increased from the tube interior 16B toward the second tube body 22. The tube interior 16A, the tube interior 16B, and the tube interior 16C are configured as fluid flow paths.

As shown in FIG. 1, the second tubular body 22 is inserted and connected to the outer peripheral portion of the second pipe coupling portion 16. On the outer periphery of the connection portion 16D on the torque input portion 14 side, a positioning portion 16E is provided which is expanded in diameter and contacts the end of the second tubular body 22 to position the end. A groove portion 16F having a reduced diameter and disposed along the circumferential direction is provided in an intermediate portion in the axial direction Ac of the connection portion 16D. Although not limited to the number of arrangements, here, two groove portions 16F are provided apart in the axial direction Ac. An O-ring 26 indicated by a broken line is fitted into the groove portion 16F, and the O-ring 26 is configured to enhance the airtightness or watertightness between the connection portion 16D and the second tubular body 22. A press-fit portion 16G is provided between the torque input portion 14 and the positioning portion 16E of the second pipe connecting portion 16. The press-fit portion 16G has a tapered shape whose diameter is increased from the positioning portion 16E toward the torque input portion 14.

As shown in FIG. 1, in the second pipe connecting portion 16, a resin product indicated by an imaginary line around the second tubular body 22 from the intermediate portion in the axial direction Ac of the connecting portion 16 </ b> D to the press-fit portion 16 </ b> G. The tubular body 24A is provided. One end of the tubular body 24A on the torque input portion 14 side is press-fitted into the press-fit portion 16G, and the other end of the tubular body 24A is configured to surround the outer periphery of the second tubular body 22. Further, a resin release ring 24B indicated by an imaginary line is provided around the second tubular body 22 at the end portion in the axial direction Ac of the connection portion 16D, and a lock ring is provided between the tubular body 24A and the release ring 24B. 24D is provided. Further, a resin cap 24C indicated by an imaginary line is provided around the tubular body 24A and the release ring 24B. In addition, in the pipe joint member 10 which concerns on this Embodiment, the said O-ring 26, the 2nd pipe body 22, etc. are assembled | attached previously before construction.

In the pipe joint member 10 configured as described above, as shown in FIGS. 1 to 3, the tool contact surface 14B of the torque input unit 14 is provided with a recess 30 that is recessed from the tool contact surface 14B in the radial direction Ca. It has been. In the present embodiment, the recess 30 is constituted by a long groove 32 and a long groove 34 with the circumferential direction as the longitudinal direction and the axial direction Ac as the short direction. More specifically, the concave portion 30 includes two

long grooves

32 and 34 that are spaced apart from and parallel to each other in the axial direction Ac on each of the (six) tool contact surfaces 14B. . The length and width of each of the long groove 32 and the long groove 34 are set to the same dimension.

When the torque is input to the torque input unit 14 by a tool, the concave portion 30 is formed so that the corner portion 14C of the tool contact surface 14B becomes a tool before at least one of the first tube connecting portion 12 and the second tube connecting portion 16 is damaged. It is set as the structure damaged by 40. Here, the breakage is a state where the corner portion 14C is crushed or licked by the tool 40, and the tool portion 40 is not applied to the corner portion 14C.

(Configuration of resin mold)
Here, the outline shape of the resin molding die (die) 50 used for manufacturing the pipe joint member 10 is shown as an imaginary line in FIG. In the present embodiment, the resin molding die 50 includes a first molding die 52 that molds a half portion along the axial direction Ac of the pipe joint member 10 including the three tool contact surfaces 14B of the torque input unit 14. And a second molding die 54 for molding the other half of the pipe joint member 10 including the other three tool contact surfaces 14B. In the present embodiment, a parting line 56 that is a boundary between the first molding die 52 and the second molding die 54 is a position where the corner portions 14C are opposed to each other. In the resin molding method, a specific resin material having fluidity is injected into a cavity formed by the first molding die 52 and the second molding die 54, and the specific resin material is cured, whereby the pipe joint member 10 is cured. Is molded. In the present embodiment, as shown in FIGS. 1 and 2, the resin injection port of the resin mold 50 is located at a position corresponding to one corner 14 </ b> C along the parting line 56 of the torque input unit 14. An injection gate 58 is provided.

As shown in FIG. 2, the flow R of the specific resin material is divided into two vertically from the injection gate 58 to the periphery of the pipe interior 14A when viewed from the axial direction Ac, and then combined into one. The bonded and hardened portion is a weld portion WL, and the weld portion WL is formed along the radial direction Ca of the torque input portion 14 as indicated by a one-dot chain line. The weld portion WL is formed on the opposite side of the position of the injection gate 58 via the tube interior 14A. The portion where the weld portion WL is formed is the corner portion 14C, and the corner portion 14C is the region 36 as described above. Therefore, the concave portion 30 is not provided in the region 36.

Further, since the pipe joint member 10 is molded by the resin mold 50, as shown in FIG. 2, the inner walls 30B to 30E (that is, the inner walls 30B to 30E along the short direction (axial direction Ac) of the long groove 32 and the long groove 34) 30B, 30C, 30D, 30E), 30H to 30K (ie, 30H, 30I, 30J, 30K) coincide with the mold release direction Ma of the resin mold 50. As a result, the mold can be released without being caught by the resin molding die 50. In addition, the surface directions of the

inner walls

30A, 30F, 30G, and 30L along the short direction of the long groove 32 and the long groove 34 are orthogonal to the mold release direction Ma.

Here, in the pipe joint member 10 of the above-described embodiment, the pipe joint member main body 10A, the first pipe connecting portion 12 whose outer peripheral portion is configured as the screw portion 12B, the torque input portion 14, and the outer peripheral portion are connected. The 2nd pipe | tube connection part 16 comprised as part 16D has shown the aspect integrally shape | molded with the specific resin material. However, the present invention is not limited to this. For example, the torque input unit 14 and a portion provided around the torque input unit 14 (specifically, the torque input unit and the outer peripheral portion are configured as the screw portion 12B. The first pipe connecting part 12 or the first connecting part 12 and a part of the second pipe connecting part 16 whose outer peripheral part is configured as the press-fit part 16D) is an aspect integrally molded with a specific resin material. May be.

It should be noted that the pipe joint member of the present invention is not limited to the pipe joint member 10 of the above-described embodiment, and various modifications can be made without departing from the scope of the invention.

Hereinafter, the present invention will be described more specifically with reference to examples. However, these examples do not limit the present invention.

(Examples 1-2, Comparative Examples 1-3)
The pellet (resin material) containing PPS resin and glass fiber shown in Table 1 was prepared. Next, the pipe joint having the structure shown in FIGS. 1 to 3 is formed by injection molding with an injection molding machine using pellets (resin material) under conditions of an injection temperature of 330 ± 10 ° C. and a mold temperature of 140 ± 10 ° C. A member was molded.

(Evaluation)
The obtained pipe joint member was subjected to a tightening strength test. Specifically, by inputting the torque from the torque input section, when the threaded portion of the pipe joint member is screwed into the pipe body, the torque at which the fracture (crack) of the pipe joint member has occurred is measured, thereby tightening. A strength test was performed. The results are shown in Table 1.

The details in Table 1 are as follows.
-PPS resin-
Resin (1): Linear (linear) PPS resin “trade name DURAFIDE (manufactured by Polyplastics Co., Ltd.)
-Resin (2): Linear (linear) PPS resin "trade name plastron (manufactured by Daicel Polymer Co., Ltd.)
-Glass fiber-
・ Fiber (1): Short glass fiber ・ Fiber (2): Long glass fiber

From the above results, it can be seen that Examples 1 and 2 in which the pipe joint member is made of a resin material containing 40% by mass of glass fiber in PPS resin have higher tightening strength than the comparative example. In the tightening strength test, in Comparative Examples 1 to 3, breakage was observed in the oriented portion of the pipe joint member.
Thereby, it turns out that fracture strength improves the pipe joint member of the present invention.

The disclosure of Japanese Patent Application No. 2014-159075 filed on August 4, 2014 is incorporated herein by reference in its entirety.
All documents, patent applications, and technical standards mentioned in this specification are to the same extent as if each individual document, patent application, and technical standard were specifically and individually described to be incorporated by reference, Incorporated herein by reference.

Claims

A pipe joint member, at least a part of which is made of a resin material containing polyphenylene sulfide resin and 35% by mass to 45% by mass glass fiber.
The pipe joint member according to claim 1, wherein the resin material contains the glass fiber in an amount of 37 mass% to 43 mass%.
The pipe joint member according to claim 1 or 2, wherein the polyphenylene sulfide resin is a linear polyphenylene sulfide resin.
The pipe joint member according to any one of claims 1 to 3, wherein the glass fiber is a short fiber.
The pipe joint member according to any one of claims 1 to 4, wherein a portion made of the resin material is injection-molded with the resin material.
A pipe joint member body;
A threaded portion provided at one axial end of the pipe joint member body;
A polygonal torque input portion provided in the axial direction intermediate portion of the pipe joint member body, and having a plurality of tool contact surfaces to which torque is input in the circumferential direction;
The pipe joint member according to any one of claims 1 to 5, further comprising:
The pipe joint member according to claim 6, wherein the torque input portion and a portion provided around the torque input portion are integrally formed of the resin material.
The pipe joint member according to claim 6, wherein the pipe joint member main body, the screw part, and the torque input part are integrally formed of the resin material.
The pipe joint member according to any one of claims 6 to 8, wherein the threaded part is a tapered male thread part whose diameter gradually decreases toward the outside in the axial direction of the pipe joint member main body.