JP2014059046A - Piping joint, piping joint structure, and water leakage prevention method using piping joint - Google Patents

Abstract

Provided are a pipe joint, a pipe joint structure, and a water leakage prevention method using a pipe joint capable of circulating a high-pressure fluid and preventing fluid leakage.
A pipe joint 100 is a pipe joint 100 that connects a resin pipe 500 and a metal pipe 600 through which a high-pressure fluid flows, a pipe part 120 fitted into the pipe of the metal pipe, and a pipe part communicating with the pipe part. And a flange portion 140 provided between the tube portion 130 and the tube portion between the tube portion and the tube portion, and an O-ring 180 provided on the outer periphery of the tube portion of the tube portion. Is included.
[Selection] Figure 5

Description

  The present invention relates to a pipe joint for connecting pipes through which a high-pressure fluid flows, a pipe joint structure, and a water leakage prevention method using the pipe joint.

Conventionally, various joints have been developed as methods for connecting pipes through which fluid flows.
For example, Patent Document 1 (Japanese Patent Application Laid-Open No. 2002-295781) discloses a flange joint for composite pipes that is excellent in internal pressure resistance.

  In the flange joint described in Patent Document 1, an inner layer made of synthetic resin formed into a tubular shape, a reinforcing layer formed by spirally winding a stretched polyolefin resin sheet on the outer peripheral surface of the inner layer, and this Flange adapter formed of a composite pipe short tube having a synthetic resin outer layer laminated on a reinforcing layer and a tubular member formed of a single synthetic resin and having a wall thickness greater than that of the composite pipe short tube A flange adapter is abutted and fused to the tip of the short pipe of the composite pipe, and a reinforcing member is attached to the outer peripheral surface of the butt fused part.

  Further, in Patent Document 2 (Japanese Patent Laid-Open No. 2006-10041), when the underground conduit is lined with a resin-made rehabilitation pipe, the diameter of the sleeve of the water stop pad is enlarged at the attachment pipe opening. The water stop pad which can prevent a part from deform | transforming and can exhibit sufficient water stop and the water stop method of an attachment pipe port are disclosed.

  In the water stop pad described in Patent Document 2, a cylindrical sleeve having an outer shape smaller than the inner diameter of the attachment tube and a flange projecting in a bowl shape from one end edge portion of the cylindrical sleeve are integrally formed, A synthetic rubber adhesive is applied to the surface of the flange, and a protective ring capable of preventing deformation of the cylindrical sleeve is disposed on the outer periphery of the cylindrical sleeve.

  Furthermore, Patent Document 3 (Japanese Patent Laid-Open No. 2012-31985) discloses a resin pipe connection structure that can easily connect and disconnect and has excellent bonding strength.

  In the connection structure of the resin pipes described in Patent Document 3, a fitting part that surrounds and sandwiches both flange parts from the outer peripheral side in a state in which the flange parts of two resin pipes having flange parts at one end face each other. A resin pipe joining structure in which two resin pipes are joined by a joining member comprising a pair of split bodies, the split body extending from the fitting portion along the outer wall of the resin pipe, and the other split body And a resin tube reinforcing portion that surrounds the outer wall of the resin tube and reinforces the resin tube, and the axial length of the resin tube reinforcing portion is 1/3 of the outer diameter of the resin tube. It is set above.

Japanese Patent Laid-Open No. 2002-295781 JP 2006-10041 A JP 2012-31985

Conventionally, metal pipes have been mainly used as high-pressure pipes for circulating a high-pressure fluid. When these high-pressure pipes, ie, metal pipes and metal pipes, are connected by welding.
However, in recent years, there has been a demand for connection of a high-pressure pipe and removal of the high-pressure pipe for cleaning and maintenance of the high-pressure pipe. Therefore, development of a pipe joint for high-pressure pipes is desired.
Furthermore, in recent years, a high-pressure resin pipe for circulating a high-pressure fluid has been developed.

An object of the present invention is to provide a pipe joint, a pipe joint structure, and a water leakage prevention method using a pipe joint that allow a high-pressure fluid to flow and prevent fluid leakage.
Another object of the present invention is to provide a pipe joint structure that circulates a high-pressure fluid, prevents fluid leakage, and improves transport efficiency.

(1)
A pipe joint according to one aspect is a pipe joint that connects one pipe and another pipe, and is connected to the inside of the pipe of the one pipe, communicates with the first cylinder part, and other pipes The second cylinder part fitted inside the pipe, the flange part provided between the first cylinder part and the second cylinder part, and the outer periphery of the cylinder part of the first cylinder part and the second cylinder part And a water leakage preventing member.

  In the pipe joint according to the present invention, a flange portion is provided between the first tube portion and the second tube portion communicating with the first tube portion. Further, a water leakage preventing member is provided on the outer periphery of the first and second cylinder portions.

In this case, the first tube portion is fitted to the inner peripheral surface of one pipe, and the second tube portion is fitted to the inner peripheral surface of another pipe. An inner surface water stop (water leakage prevention) on the inner peripheral surface of one pipe can be realized by the water leakage preventing member provided on the outer periphery of the first cylindrical portion. Moreover, the inner surface water stop (leakage prevention) in other piping is realizable by the water leakage prevention member provided in the cylinder part outer periphery of the 2nd cylinder part.
As a result, even when a high-pressure fluid is flowed from one pipe to the other pipe side, fluid leakage can be prevented. In addition, the high pressure of said high pressure fluid shows the range of 1 Mpa or more and 50 Mpa or less.
Further, examples of the water leakage prevention member include other water leakage prevention members such as an O-ring and a gasket.

(2)
A pipe joint according to a second invention is a pipe joint according to one aspect, wherein at least one of the first cylinder part and the second cylinder part has a cylinder part outer peripheral recess, and the water leakage preventing member is a cylinder part outer peripheral recess. It may be attached to.

  In this case, a cylinder part outer periphery recessed part is formed in at least one of a 1st cylinder part and a 2nd cylinder part. Moreover, since the leakage preventing member is attached to the outer peripheral concave portion of the cylindrical portion, it is possible to prevent the leakage preventing member from being displaced and to reliably prevent leakage.

(3)
The pipe joint according to the third invention is a pipe joint according to one aspect or a pipe joint according to the second invention, wherein the outer diameter of the first cylinder part and the outer diameter of the second cylinder part are different. It may consist of.

  In this case, since the outer diameter of the first cylinder part and the outer diameter of the second cylinder part are different from each other, even if the one pipe that circulates the high-pressure fluid and the other pipe are different in diameter. Can support connection.

(4)
The pipe joint according to the fourth invention is a pipe joint according to one aspect, or a pipe joint according to the second invention, wherein the outer diameter of the first cylinder part and the outer diameter of the second cylinder part are the same diameter. It may consist of.

  In this case, since the outer diameter of the first cylinder part and the outer diameter of the second cylinder part are the same diameter, even if one pipe that circulates the high-pressure fluid and the other pipe are pipes having the same diameter. Can respond.

(5)
A pipe joint according to a fifth aspect of the present invention is a pipe joint according to one aspect, a pipe joint according to the second to fourth aspects of the invention, wherein the inner diameter of the first cylinder part and the inner diameter of the second cylinder part are continuous. An inclined curved surface may be included.

  In this case, the flow of the fluid that communicates the inner diameter of the first cylinder part and the second cylinder part can be adjusted. That is, since a sudden change is not caused, the generation of a large turbulent flow can be prevented.

(6)
A pipe joint according to a sixth invention is a pipe joint according to one aspect, a pipe joint according to the second to fifth inventions, wherein the communication direction lengths of the first cylinder part and the second cylinder part are different. Good.

  In this case, since the communication direction lengths of the first tube portion and the second tube portion are different, the communication direction length can be increased when the high-pressure fluid flows in the upstream pipe.

(7)
A pipe joint according to a seventh invention is a pipe joint according to one aspect, a pipe joint according to the second to sixth inventions, and an inner periphery and an end of at least one of the first cylinder part and the second cylinder part Further, a taper shape may be formed.

  In this case, since the tapered shape is formed at the inner periphery and at the end of at least one of the first tube portion and the second tube portion, turbulent fluid flow is prevented when the high-pressure fluid passes through the pipe joint. Thus, laminar flow can be maintained.

(8)
The pipe joint according to the eighth invention is a pipe joint according to one aspect, a pipe joint according to the second to seventh inventions, wherein at least the flange portion may be made of metal.

  In this case, since at least the flange portion is made of metal, the pipe joint can be easily inserted into one pipe and another pipe using an instrument (jig) such as a vise. Further, the entire pipe joint may be made of metal, and the first tube portion and the second tube portion of the pipe joint may be made of resin, and only the flange portion may be made of metal.

(9)
A pipe joint according to a ninth invention is a pipe joint according to one aspect, a pipe joint according to the second to eighth inventions, wherein at least one of the first cylinder part and the second cylinder part is made of resin. Good.

  In this case, at least one of the first tube portion and the second tube portion is made of resin, so that molding or processing becomes easy, and the cost and weight are reduced compared to the case where the entire pipe joint is made of metal. There are benefits. Further, the entire pipe joint may be made of resin, and the first tube portion and the second tube portion of the pipe joint may be made of resin, and only the flange portion may be made of metal.

(10)
A pipe joint according to a tenth invention is a pipe joint according to one aspect, a pipe joint according to any one of the second to ninth inventions, wherein the flange part is a flange part of one pipe and another pipe. You may have a through-hole corresponding to the fixed hole formed in the flange part.

In this case, since the flange portion of the pipe joint has a through hole corresponding to the fixed hole formed in the flange portion of one pipe and the flange portion of the other pipe, either one of the one pipe or the other pipe is Even if it is resin piping, positioning of a pipe joint can be performed reliably.
Moreover, a tap groove may be attached to the through hole, a hole that is not allowed to penetrate, or a tap groove that is not allowed to penetrate may be provided.

(11)
A pipe joint according to an eleventh invention is a pipe joint according to one aspect, a pipe joint according to any one of the second to ninth inventions, wherein the flange portion is a fixed portion formed on the flange portion of one pipe. You may have the hole with a tap groove formed corresponding to the hole, and the hole with a tap groove formed corresponding to the fixed hole formed in the flange part of other piping.

  In this case, since the hole with the tap groove is provided for each pipe, the pipe joint can be easily attached to the pipe. Moreover, since one piping can be attached after the other piping is attached, working efficiency can be improved.

(12)
A pipe joint structure according to a twelfth aspect of the present invention is a pipe joint structure including the pipe joint according to any one of claims 1 to 11, one pipe, and another pipe. At least one of the pipes is a flange joint in which a pipe body having a first diameter expanding toward the end of the pipe, and a flange portion for connecting to another pipe on the outer peripheral surface of the short pipe And a semi-cylindrical core member inserted between the outer peripheral surface of the pipe having the first diameter shape and the inner peripheral surface of the short pipe of the flange joint.

  In this case, the tubular body having the first diameter shape expands toward the end of the pipe. As for the flange joint, the flange part for connecting to other piping is provided in the outer peripheral surface of the short pipe. The semi-cylindrical core member is inserted between the outer peripheral surface of the tubular body having the first diameter shape and the inner peripheral surface of the short pipe of the flange joint.

In this case, even when a high-pressure fluid is flowed from one pipe to the other pipe side, fluid leakage can be prevented.
Further, since the flange joint can be removed, the flange portion does not take up space during transportation or the like, and transportation efficiency can be improved.

(13)
A water leakage prevention method using a pipe joint according to another aspect includes a first tube portion, a second tube portion communicating with the first tube portion, and a flange provided between the first tube portion and the second tube portion. And a pipe joint that connects one pipe through which a high-pressure fluid flows and another pipe using a pipe joint that includes a water leak prevention member provided on the outer circumference of the cylinder section of the first cylinder section and the second cylinder section A method for preventing water leakage by inserting a first cylindrical portion into one pipe and compressing and deforming a water leakage preventing member on the inner surface of the pipe and the outer surface of the first cylindrical portion. A first step, and a second step of inserting a second cylinder part into another pipe and compressing and deforming the water leakage prevention member between the pipe inner surface of the one pipe and the outer surface of the second tube part to prevent water leakage. Is included.

In this case, a 1st cylinder part is inserted in the inside of one piping, and a 2nd cylinder part is inserted in the inside of other piping. An inner surface water stop (prevention of water leakage from the inner surface) on the inner peripheral surface of one pipe can be realized by the water leakage preventing member provided on the outer periphery of the first cylindrical portion. Moreover, the inner surface water stop (leakage prevention from an inner surface) in other piping is realizable by the water leakage prevention member provided in the cylinder part outer periphery of the 2nd cylinder part.
As a result, fluid leakage can be prevented even when a high-pressure fluid flows from one pipe to another pipe. In addition, the high pressure of said high pressure fluid shows the range of 1 Mpa or more and 50 Mpa or less.

(A)
The pipe joint according to the fourteenth invention is a pipe joint according to any one of the pipe joint according to one aspect to the eleventh invention, wherein the pipe joint is inserted into at least one of one pipe or another pipe. A guide shape may be formed at the end of the inner peripheral surface of the pipe.

Here, since resin piping is mainly formed by extrusion molding, variation in inner diameter is large. Therefore, the pipe joint can be smoothly inserted by forming the guide shape at the end of the inner peripheral surface of the resin pipe into which the pipe joint is inserted.
In addition, said induction | guidance | derivation shape shows the curved surface or inclined surface provided in a part of outer periphery in an edge part, or the perimeter.

  As described above, according to the present invention, high-pressure fluid can be circulated and fluid leakage can be prevented.

It is a typical top view showing an example of a piping joint concerning this embodiment. It is a typical side view of the piping joint shown in FIG. It is typical sectional drawing which shows an example of the AA line cross section of FIG. It is a partially expanded sectional view for demonstrating the cross section of a piping joint. It is typical sectional drawing which shows an example which attaches a piping joint between resin piping and metal piping. It is typical sectional drawing for demonstrating the effect at the time of attaching a pipe joint between resin piping and metal piping. It is typical sectional drawing which shows the other example which attaches a pipe joint between the resin piping shown in FIG. 5, and metal piping. It is typical sectional drawing which shows the piping joint structure using the resin piping of another example. It is a schematic plan view which shows the other example of a piping joint. It is a schematic plan view which shows the other example of a piping joint. It is a typical side view which shows the other example of a piping joint. It is typical sectional drawing which shows the BB line cross section of a pipe joint. It is typical sectional drawing which shows an example which attaches a piping joint between resin piping and metal piping. It is typical sectional drawing for demonstrating the state which attached the pipe joint between resin piping and metal piping. It is typical sectional drawing for demonstrating the state which attached the pipe joint between resin piping. It is typical sectional drawing for demonstrating the further another example of a piping joint. It is typical sectional drawing for demonstrating the further another example of a piping joint.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description, the same parts are denoted by the same reference numerals. Their names and functions are also the same. Therefore, detailed description thereof will not be repeated.

<Overall outline of piping joint>
FIG. 1 is a schematic plan view showing an example of a pipe joint 100 according to the present embodiment, FIG. 2 is a schematic side view of the pipe joint 100 shown in FIG. 1, and FIG. It is a typical sectional view showing an example of an AA line section.

As shown in FIGS. 1 and 2, the pipe joint 100 includes a flange plate 140 between the cylindrical portion 120 and the cylindrical portion 130.
As shown in FIG. 1, the flange plate 140 is provided with a plurality of holes 150 whose centers are located on concentric circles in a radial pattern. As will be described later, the hole 150 has a positioning function for fixing the pipe joint 100 to the pipe 500 and the pipe 600 or for aligning the axis of the pipe 500 and the pipe 600 with the axis of the pipe joint 100. Have.

  Moreover, as shown in FIG. 1 and FIG. 2, the cylinder part 120 and the cylinder part 130 consist of a cylindrical shape. A concave portion 121 is provided on the outer peripheral surface of the cylindrical portion 120. A concave portion 131 is provided on the outer peripheral surface of the cylindrical portion 130. The concave portion 121 is provided so as to be connected around the outer periphery of the cylindrical portion 120. Further, the recess 131 is provided so as to be connected around the outer periphery of the cylindrical portion 130.

<Cross section of piping joint>
Next, as shown in FIG. 3, a hole 125 penetrating the cylindrical portion 120, the flange plate 140, and the cylindrical portion 130 is formed inside the pipe joint 100. An inclined surface C is provided on the inner peripheral surface of the end of the hole 125 on the cylindrical portion 120 side.
Similarly, an inclined surface C is also provided on the inner peripheral surface of the end portion of the hole 125 on the cylindrical portion 130 side.

<O-ring installation>
Next, FIG. 4 is a partially enlarged cross-sectional view showing a state in which an O-ring 180 that is a water leakage preventing member is attached to the recess 121.

  Here, when the nominal diameter of the pipes 500 and 600 (see FIGS. 5 and 6) connected to the pipe joint 100 in the present embodiment is 75A (name A), the cylinders 120 and 130 shown in FIG. The outer diameter L1 is 76.5 mm, and the groove diameter L2 is 68.5 mm. The outer diameter L3 of the flange plate 140 is 185 mm.

When the nominal diameter is 75A (name A), the O-ring 180 has an inner diameter of 64.6 mm and a cross-sectional diameter of 5.7 ± 0.15 mm (reference number: P65, JIS B2401). As shown in the enlarged view of FIG. 4, the crushing margin (L12 / L13) of the 0 ring 180 is preferably in the range of 20% to 30%.
In the present embodiment, as a result of actual measurement, when the nominal diameter is 75A (name A), the range of the crushing margin of the O-ring 180 is a range from 23.9% to 24.6%.

  On the other hand, when the nominal diameter of the pipes 500 and 600 (see FIGS. 5 and 6) connected to the pipe joint 100 in the present embodiment is 200 A (name A), the cylinder portions 120 and 130 shown in FIG. The diameter L1 is 192 mm, and the groove diameter L2 is 181.5 mm. The outer diameter L3 of the flange plate 140 is 412 mm.

In the present embodiment, when the nominal diameter of the pipes 500 and 600 (see FIGS. 5 and 6) connected to the pipe joint 100 in the present embodiment is 200 A (name A), the size of the O-ring 180 is the inner diameter. 179.5 mm, and the cross-sectional diameter is 8.4 ± 0.15 mm (nominal number: P180, JIS B2401). Even if the nominal diameter changes, as shown in the enlarged view of FIG. 4, it is preferable that the crushing distance (L12 / L13) of the 0-ring 180 is in the range of 20% to 30%.
In the present embodiment, as a result of actual measurement, when the nominal diameter is 200 A (name A), the crushing range of the O-ring 180 is a range from 21.7% to 27.0%.

In the present embodiment, two O-rings 180 are attached to both sides of the flange plate 140, but the number of O-rings 180 attached is not limited to this, the length of the cylindrical portions 120 and 130, It may be appropriately determined in consideration of the type and pressure of the high-pressure fluid to be circulated, the configuration and constituent materials of the pipe joint 100, the mounting workability of the O-ring 180, and the like.
Different numbers may be attached to the cylindrical portion 120 side and the cylindrical portion 130 side from the flange plate 140. For example, two O-rings 180 on the cylindrical portion 120 side from the flange plate 140 and one on the cylindrical portion 130 side. The book may be attached.

<Attachment of resin piping 500 and metal piping 600>
5 is a schematic cross-sectional view showing an example of attaching the pipe joint 100 between the resin pipe 500 and the metal pipe 600. FIG. 6 shows the pipe joint 100 between the resin pipe 500 and the metal pipe 600. It is typical sectional drawing for demonstrating the effect at the time of attaching.

<When the entire piping joint 100 is made of metal>
For example, when the entire pipe joint 100 is made of metal, the tubular portion 130 of the pipe joint 100 is inserted into the pipe interior 515 of the resin pipe 500 as shown in FIG. In this case, the cylindrical part 130 of the pipe joint 100 can be easily inserted into the pipe interior 515 of the resin pipe 500 by sandwiching the flange plate 140 and the flange part 510 of the resin pipe 500 with an instrument such as a vise. .

  In the resin pipe 500, since the manufacturing process is generally formed by extrusion molding, the outer shape of the resin pipe 500 is formed with a specified value, but the inner diameter L500 of the resin pipe 500 is less than the reference value. There are many variations. Even in this case, since the pipe joint 100 is made of metal, the pipe joint 100 can be easily inserted into the pipe interior 515 of the resin pipe 500.

  On the other hand, the cylindrical portion 120 of the pipe joint 100 is inserted into the pipe interior 615 of the metal pipe 600. In this case, since the flange portion 510 of the resin pipe 500 and the flange plate 140 of the pipe joint 100 are already integrated, the flange portion 510 and the flange plate 140 that are integrated with the flange portion 610 of the metal pipe 600 are connected to each other. By sandwiching with a tool such as a force, the pipe joint 100 can be easily inserted into the pipe interior 615 of the metal pipe 600 and attached.

  Subsequently, as shown in FIG. 5, the bolt B is passed through the fixing hole of the flange portion 510 of the resin pipe 500, the hole 150 of the flange plate 140, and the fixing hole of the flange portion 610 of the metal pipe 600 and fixed with the nut N. . In the present embodiment, fixing is performed with eight bolts B and nuts N.

As a result, as shown in FIG. 6, the pipe joint 100 is accurately attached between the resin pipe 500 and the metal pipe 600.
The metal described in the above embodiment is, for example, bronze casting (BC6, BC6C), brass casting (YBsC3), modified brass drawing rod (extruded rod) (C3604BD (BE)), for casting Brass drawn rod (extruded rod) (C3771BD (BE)), phosphorous deoxidized copper tube (C1220T), chromium plating on copper alloy substrate (BCrM), nickel plating on copper alloy substrate (BNM), gray cast iron product (FC) ), Ductile cast iron (FCD), malleable cast iron (FCMB), carbon tool steel (SK), stainless steel (18Cr-8Ni) (SUS304), stainless steel (18Cr-12Ni-MO) (SUS316), stainless steel (18Cr-12Ni-) MO ultra low C) (SUS316L), aluminum alloy die casting (ADC), zinc alloy die casting (ZDC), etc. Laminated tube, it is possible to select the configuration and any material such as a composite tube. Furthermore, these metals may be subjected to rust prevention treatment such as plating or painting.

  As shown in FIG. 6, for example, when the high-pressure fluid FL is caused to flow from the resin pipe 500 to the metal pipe 600, the inclined surface C of the pipe joint 100 causes the state of the high-pressure fluid FL passing through the pipe joint 100 to be a laminar flow. Has the function of maintaining the state.

<When only the pipe joints 120 and 130 are made of resin>
Moreover, when the cylinder parts 120 and 130 of the pipe joint 100 are made of resin, the thickness of the cylinder parts 120 and 130 is preferably in the range of 3 mm to 15 mm from the viewpoint of pressure resistance, and is in the range of 3 mm to 10 mm. More desirable.
If the thickness is less than 3 mm, the strength and rigidity are insufficient, and the cylindrical portions 120 and 130 may be destroyed. Further, if the thickness is greater than 15 mm, when the cylinder part 130 is inserted into the pipe inside 515 of the resin pipe 500 or when the cylinder part 120 is inserted into the pipe inside 615 of the metal pipe 600, the reduced diameter inside the pipe is reduced. There is a risk that the flow resistance of the high-pressure fluid FL increases and the flow is hindered.
As shown in the enlarged view of FIG. 6, when the pressure of the high-pressure fluid FL in the cylindrical portions 120 and 130 is high, the high-pressure fluid FL generates a force FS against the inclined surface C and the pipe joint 100 A force FV that pushes the hole 125 in the outer circumferential direction is generated.

  As a result, the O-ring 180 is pressed against the pipe inside 515 of the resin pipe 500 and the pipe inside 615 of the metal pipe 600 by the force FV. As a result, even when a high-pressure high-pressure fluid FL is flowed, it is possible to prevent water from leaking from the vicinity where the pipe joint 100 is joined.

<When piping joint is resin>
When the entire pipe joint 100 is made of resin, the thickness of the cylindrical portions 120 and 130 is desirably in the range of 5 mm to 15 mm from the viewpoint of pressure resistance, and the thickness of the flange plate 140 is from the pressure resistant surface. A range of 5 mm or more and 20 mm or less is desirable. If the thickness of the cylindrical portions 120 and 130 is smaller than 5 mm, the strength and rigidity are insufficient, and the piping joint 100 made entirely of resin may be destroyed.

In addition, if the thickness of the cylinder portions 120 and 130 is greater than 15 mm, the pipe portion 130 is inserted when the cylinder portion 130 is inserted into the pipe inside 515 of the resin pipe 500 or when the cylinder portion 120 is inserted into the pipe inside 615 of the metal pipe 600. There is a possibility that the internal diameter is significantly reduced, and the flow resistance of the high-pressure fluid FL is increased to hinder the flow.
Further, if the thickness of the flange plate 140 is smaller than 5 mm, the strength and rigidity are insufficient, and the flange plate 140 may be destroyed.
If the thickness of the flange plate 140 is greater than 20 mm, the thickness of the resin increases, and there is a risk that dimensional deviation is likely to occur due to shrinkage or the like.

  As shown in the enlarged view of FIG. 6, when the pressure of the high-pressure fluid FL in the cylindrical portions 120 and 130 is high, the high-pressure fluid FL generates a force FS against the inclined surface C and the pipe joint 100 A force FV that pushes the hole 125 in the outer circumferential direction is generated.

  As a result, the O-ring 180 is pressed against the pipe inside 515 of the resin pipe 500 and the pipe inside 615 of the metal pipe 600 by the force FV. As a result, even when a high-pressure high-pressure fluid FL is flowed, it is possible to prevent water from leaking from the vicinity where the pipe joint 100 is joined.

  Examples of the resin described in the above embodiment include hard vinyl chloride resin (polyvinyl chloride: PVC), acrylonitrile / butadiene / styrene resin (ABS), acrylonitrile / styrene resin (AS), and epoxy resin. (EP), melanin resin (MF), polycarbonate resin (PC), ethylene trifluoride resin (PCTFE), polyethylene resin (PE), methacrylic resin (acrylic resin: PMMA), acetal resin (POM), polypropylene resin (PP ), Polystyrene resin (PS), tetrafluoroethylene resin (PTFE), polyurethane resin (PUR) or polyvinyl acetate resin (PVAC), etc., fiber reinforced plastic (FRP), laminated tubes of these, composite tubes Any material and configuration can be selected

(Other examples)
FIG. 7 is a schematic cross-sectional view showing another example in which the pipe joint 100 is attached between the resin pipe 500 and the metal pipe 600 shown in FIG. In another example, a resin pipe 500a is used instead of the resin pipe 500 shown in FIG. Others are the same as FIG.

As shown in FIG. 7, the resin pipe 500 a is provided with a guide portion 550 so that the pipe joint 100 can be easily inserted. The guide portion 550 has an inclined surface D formed at the inner peripheral end of the resin pipe 500a so that the pipe joint 100 can be easily inserted.
As a result, even when the inner diameter L500 varies due to extrusion, the pipe joint 100 can be easily inserted because the inclined surface D is formed at the end of the inner peripheral surface of the resin pipe 500a. it can.
In addition, although the guide part 550 demonstrated the inclined surface D by the example, it is not limited to this, Any of R shape, a curved surface, and another induction | guidance | derivation shape may be sufficient, The inner peripheral edge part whole piping inside 515, Or you may provide in a part of inner peripheral edge part.

(Piping joint structure)
FIG. 8 is a schematic cross-sectional view showing a pipe joint structure using a resin pipe of another example.

As shown in FIG. 8, a resin pipe 500b may be used instead of the resin pipes 500 and 500a. The resin pipe 500b includes a pipe body 511, a core member 560, and a flange joint 570.
Further, a large-diameter portion 511 b where the outer diameter of the tube body 511 gradually increases is formed at the end of the tube body 511. The outer periphery of the large diameter portion 511b is a tapered surface. Further, a core member 560 is provided so as to circumscribe the tapered surface. The core member 560 has the same shape of a plurality of members. The flange joint 570 has a shape in which an annular flange portion is integrally provided on the outer peripheral surface of a cylindrical short pipe. A tapered surface having an inner peripheral surface shape corresponding to the tapered surface having the outer peripheral surface shape of the core member 560 is formed on the inner peripheral surface of the short pipe.

  Since the flange joint 570 which is a flange part can be removed by using the resin piping 500b, transportation efficiency can be improved. That is, since the protruding portion of the flange can be removed, the resin piping 500b can be densely loaded. Furthermore, the use of the pipe joint 100 can prevent water leakage of the high-pressure fluid FL.

(Still other examples)
9 and 10 are schematic plan views showing other examples of the pipe joint 100, FIG. 11 is a schematic side view showing another example of the pipe joint 100, and FIG. 6 is a schematic cross-sectional view showing another example of the pipe joint 100. FIG.

  9 shows a plane viewed from one side of the pipe joint 100, and FIG. 10 shows a plane viewed from the back side of one side of the pipe joint 100. 11 shows a schematic side view of FIGS. 9 and 10, and FIG. 12 shows a cross section taken along line BB of FIGS. 9 and 10.

First, as shown in FIGS. 9, 10, and 11, the pipe joint 100a includes a flange plate 140a between the cylindrical portion 120a and the cylindrical portion 130a.
As shown in FIG. 9, a plurality of holes 151 whose centers are located concentrically are provided radially on the surface side of the flange plate 140a. As will be described later, the hole 151 includes a hole provided with a tap to fix the pipe joint 100 to the pipe 500 and the pipe 600.
As shown in FIG. 10, a plurality of holes 152 whose centers are located concentrically are provided radially on the back side of the flange plate 140a. The hole 152 is formed so as to have a relative position different from that of the hole 151.
Similar to the pipe joint 100, the holes 151 and 152 have a positioning function for aligning the axis of the pipe 500 and the pipe 600 with the axis of the pipe joint 100.

  Moreover, as shown in FIG. 11, the cylinder part 120a and the cylinder part 130a consist of a cylindrical shape. A concave portion 121a is provided on the outer peripheral surface of the cylindrical portion 120a. A concave portion 131a is provided on the outer peripheral surface of the cylindrical portion 130a. The concave portion 121a is provided so as to be connected around the outer periphery of the cylindrical portion 120a. Moreover, the recessed part 131a is provided so that one round may be connected along the outer periphery of the cylinder part 130a.

  Furthermore, unlike the pipe joint 100, the pipe joint 100a in another example differs in the outer diameter of the cylinder part 120a and the cylinder part 130a. The cylinder part 120a is made of a diameter L22, and the cylinder part 130a is made of a diameter L33 (L22 <L33).

<Cross section of piping joint>
Next, FIG. 12 is a schematic cross-sectional view showing a cross section taken along line BB of the pipe joint 100a.
As shown in FIG. 12, the pipe joint 100a has a cylindrical portion 120a, a flange plate 140a, and a hole 125a penetrating the cylindrical portion 130a.

An inclined surface C is provided on the inner peripheral surface of the end portion of the hole 125a on the cylindrical portion 120a side and the inner peripheral surface of the end portion of the hole 125a on the cylindrical portion 130a side.
Further, unlike the pipe joint 100, the hole 125a of the pipe joint 100a has a cylindrical shape whose inner diameter decreases from the cylinder part 130a side to the cylinder part 120a side.
As shown in FIG. 12, the hole 125a on the cylinder part 130a side of the pipe joint 100a is made of a diameter L33a, and the hole 125a on the cylinder part 120a side is made of an inner diameter L22a (L22a <L33a).

A groove formed by a tap is provided on the inner surface of the hole 151, and a groove formed by a tap is also provided on the inner surface of the hole 152.
Moreover, in this example, the holes 151 and 152 are formed without penetrating the flange plate 140a.
The holes 151 and 152 may be provided as through holes as long as there is no problem in the installation of the pipes 500 and 600.

<Installation of resin piping 500a and metal piping 600>
Next, FIG. 13 is a schematic cross-sectional view showing an example of attaching the pipe joint 100a between the resin pipe 500a and the metal pipe 600. FIG. 14 shows the pipe joint 100a between the resin pipe 500a and the metal pipe 600. It is typical sectional drawing for demonstrating the attached state.

As shown in FIG. 13, the metal pipe 600 has an inner diameter corresponding to the outer diameter L22 of the cylindrical portion 120a of the pipe joint 100a.
Bolts B are passed through holes formed in the flange portion 610 provided in the metal pipe 600, and the end portions of the bolts B are formed into holes 151 in which grooves are formed by taps formed on the flange plate 140a of the pipe joint 100a. Fixed.
Further, the resin pipe 500a has an inner diameter corresponding to the outer diameter L33 of the cylindrical portion 130a of the pipe joint 100a.
Bolts B are passed through holes formed in the flange portion 510 provided in the resin pipe 500a, and the ends of the bolts B are formed into holes 152 in which grooves are formed by taps formed on the flange plate 140a of the pipe joint 100a. Fixed.

As a result, as shown in FIG. 14, the pipe joint 100 a is attached to the resin pipe 500 a and the metal pipe 600. In this case, even if the resin pipe 500a and the metal pipe 600 have different inner diameters, they can be easily connected and a high-pressure fluid can be circulated.
Further, by providing the holes 151 and 152 in which grooves are formed by taps, nuts are not necessary, so that work efficiency can be improved.

Next, FIG. 15 is a schematic cross-sectional view for explaining a state in which the pipe joint 100a is attached between the resin pipe 500a and the resin pipe 500b.
As shown in FIG. 15, the pipe joint 100a can be easily attached between the resin pipes 500a and 500b. Further, although not shown, a resin pipe 500a may be provided between the metal pipe and the metal pipe instead of the resin pipes 500a and 500b.

(Still other examples)
Next, another example of the pipe joint 100a will be described. 16 and 17 are schematic cross-sectional views for explaining still another example of the pipe joint 100a.

A pipe joint 100b shown in FIG. 16 is provided with a cylinder part 130b instead of the cylinder part 130a of the pipe joint 100a. In the pipe joint 100a, the length from the flange plate 140a to the end of the cylinder part 120a and the cylinder part 130a is the same, but the pipe joint 100b shown in FIG. 16 is different from the length LL2 of the cylinder part 120a. The cylindrical portion 130b is provided so that the length LL3 (LL2 <LL3) becomes longer.
As a result, the pipe joint 100b can be more firmly attached to the pipe.

A pipe joint 100c shown in FIG. 17 includes holes 125c and 126c of the pipe joint 100c. That is, it consists of a hole 125c and a hole 126c with respect to the hole 125 in the pipe joint 100a.
By forming the hole 125c and the hole 126c to have different inclination angles, the wall thickness t in the cylindrical portion 120a can be increased.
As a result, the pipe joint 100c can be formed more robustly.

(Example)
An experiment was performed using the pipe joint 100 described in the present embodiment. In the experiment, a pipe having a nominal diameter of 75A was used. In consideration of the safety factor of the product, a water pressure of 10.5 MPa was applied and maintained for 1 hour, but no water leakage from the joint portion of the pipe joint 100 was observed.

As described above, the cylinder portion 120 is fitted into the pipe interior 615 of the metal pipe 600, and the cylinder portion 130 is fitted into the pipe interior 515 of the resin pipe 500, so that O provided on the outer periphery of the cylinder portion 120 is obtained. The ring 180 can realize inner surface water stop (water leakage prevention) on the inner peripheral surface of the metal pipe 600, and the inner ring water stop (water leakage prevention) in the resin pipe 500 can be achieved by the O ring 180 provided on the outer periphery of the cylindrical portion 130. Can be realized.
As a result, even when the high-pressure fluid FL flows from the resin pipe 500 to the metal pipe 600 side, water leakage of the high-pressure fluid FL can be prevented.

  In addition, since the inclined surface C is formed at the inner periphery and at the end of at least one of the cylinder part 120 and the cylinder part 130 of the pipe joint 100, the high-pressure fluid FL passes through the pipe joint 100. FL turbulence can be prevented and laminar flow can be maintained.

  Moreover, since the flange plate 140 of the pipe joint 100 has the hole 150 corresponding to the fixing hole formed in the flange part 510 of the resin pipe 500 and the flange part 610 of the metal pipe 600, the pipe joint 100 is positioned reliably. be able to.

  Moreover, since the recessed parts 121 and 131 are formed in at least one of the cylinder parts 120 and 130, and the O-ring 180 is attached to the recessed parts 121 and 131, the O-ring 180 is prevented from being displaced and the prevention of water leakage is ensured. be able to.

  Furthermore, even if one pipe that circulates the high-pressure fluid and another pipe have different diameters or pipes having the same diameter, they can be dealt with by matching the diameters of the cylindrical portions.

  Moreover, the flow of the fluid can be adjusted by the holes 125 having a continuous inclined curved surface. That is, since a sudden change is not caused, the generation of a large turbulent flow can be prevented.

  In the present embodiment, the high-pressure fluid FL corresponds to a high-pressure fluid, the resin pipe 500 and the metal pipe 600 correspond to one pipe or another pipe, and the pipe joints 100, 100a, 100b, and 100c are pipe joints. The cylindrical portions 120 and 120a correspond to the first cylindrical portion, the cylindrical portions 130 and 130a correspond to the second cylindrical portion, the flange plates 140 and 140a correspond to the flange portion, and the inner peripheral surface of the hole 125a. Corresponds to a continuous inclined curved surface, the O-ring 180 corresponds to a water leakage preventing member, the inclined surface C corresponds to a tapered shape, the pipe joint 100 and the pipe 500b in FIG. 8 correspond to a pipe joint structure, and a pipe body 511. Corresponds to a tubular body, holes 151 and 152 in which grooves are formed by taps correspond to holes with tapped grooves, flange joint 570 corresponds to a flange joint, and core member 560 corresponds to a core member. Hole 150 corresponds to the through hole.

  The preferred embodiments of the present invention are as described above, but the present invention is not limited to them. It will be understood that various other embodiments may be made without departing from the spirit and scope of the invention. Furthermore, in this embodiment, although the effect | action and effect by the structure of this invention are described, these effect | actions and effects are examples and do not limit this invention.

100, 100a, 100b, 100c Pipe joint 120, 130 Tube part 140 Flange plate 150 Hole 180 O-ring 500 Resin pipe 600 Metal pipe C Inclined surface FL High pressure fluid

Claims (13)

A pipe joint that connects one pipe through which a high-pressure fluid flows and another pipe,
A first tube portion that fits inside the pipe of the one pipe;
A second tube portion that communicates with the first tube portion and fits inside a pipe of the other tube;
A flange portion provided between the first tube portion and the second tube portion;
And a water leakage preventing member provided on the outer periphery of the cylindrical portion of the first cylindrical portion and the second cylindrical portion. At least one of the first tube portion and the second tube portion has a tube portion outer peripheral recess,
The pipe joint according to claim 1, wherein the water leakage preventing member is attached to the outer circumferential concave portion of the cylindrical portion.   3. The pipe joint according to claim 1, wherein an outer diameter of the first tube portion and an outer diameter of the second tube portion are different from each other.   3. The pipe joint according to claim 1, wherein an outer diameter of the first cylindrical portion and an outer diameter of the second cylindrical portion are the same diameter.   5. The pipe joint according to claim 1, comprising an inclined curved surface in which the inner diameter of the first cylinder portion and the inner diameter of the second cylinder portion that communicate with each other are continuous.   The pipe joint according to any one of claims 1 to 5, wherein communication lengths of the first tube portion and the second tube portion are different.   The pipe joint according to any one of claims 1 to 6, wherein a tapered shape is formed on an inner periphery and an end of at least one of the first cylinder part and the second cylinder part.   The pipe joint according to any one of claims 1 to 7, wherein at least the flange portion is made of metal.   The pipe joint according to any one of claims 1 to 8, wherein at least one of the first tube portion and the second tube portion is made of resin.   The said flange part has a through-hole corresponding to the fixing hole formed in the flange part of said one piping, and the flange part of said other piping, The any one of Claim 1 to 9 characterized by the above-mentioned. Pipe fittings. The flange portion is a hole with a tap groove formed corresponding to a fixing hole formed in the flange portion of the one pipe.
The pipe joint according to any one of claims 1 to 9, further comprising a tapped groove formed corresponding to a fixing hole formed in a flange portion of the other pipe. The pipe joint according to any one of claims 1 to 11,
A pipe joint structure including the one pipe and another pipe,
At least one of the one pipe and the other pipe is
A tubular body having a first diameter shape that expands toward an end of the pipe;
A flange joint provided with a flange portion for connection to another pipe on the outer peripheral surface of the short pipe;
A pipe joint structure comprising: an outer peripheral surface of a pipe having the first diameter shape; and a semi-cylindrical core member inserted between an inner peripheral surface of the short pipe of the flange joint. . A first tube portion;
A second tube portion communicating with the first tube portion;
A flange portion provided between the first tube portion and the second tube portion;
A pipe joint that connects one pipe for circulating a high-pressure fluid and another pipe using a pipe joint including a water leakage preventing member provided on the outer circumference of the first and second cylinder parts. A leakage prevention method used,
A first step of inserting the first tube portion into the one pipe and compressing and deforming the water leakage preventing member on the inner surface of the pipe and the outer surface of the first tube portion to prevent water leakage;
A second step of inserting the second cylinder part into the other pipe and preventing the water leakage by compressing and deforming the water leakage preventing member between the pipe inner surface of the one pipe and the outer surface of the second cylinder part; A method for preventing water leakage using a pipe joint, comprising:

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