JP2008051342A - Pipe coupling - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pipe coupling without the risk of the slip-out of a fluid tube and a connecting member forming a fluid flowing passage from a body, even if forming the body of a resin material. <P>SOLUTION: The body 12 of the pipe coupling 10 is formed of a material like resin. A ring member 24 and ring members 58a and 58b are caulked to and installed at the outer wall of the body 12. Thus, the body 12 is prevented from being deformed outward. When using this pipe coupling 1 in a high temperature atmosphere, even if a force in the separating direction from the pipe coupling 10 acts on the fluid tube 102 by an external force or a pressure fluid flowing inside the pipe coupling 10, the slip-out of the fluid tube 102 and the connecting member 14 inserted into the body 12 can be surely prevented. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a pipe joint for connecting a fluid tube in which a passage for introducing and deriving a fluid is formed to a fluid pressure device such as an electromagnetic valve and a cylinder.

  Conventionally, pipe joints have been used to connect and connect fluid tubes to fluid pressure devices such as solenoid valves and cylinders. As this type of pipe joint, a body in which a fluid tube is inserted is formed of a resin material is known.

  However, in the pipe joint according to the above prior art, when used in a high temperature atmosphere, the body formed of the resin material faces outward as compared with the pipe joint having the body formed of the metal material. The tube for fluid may be pulled out from the pipe joint when a force in the direction of detachment from the pipe joint is applied to the fluid tube by an external force or by a pressure fluid flowing through the pipe joint. It was done. Further, when an external force such as an impact is applied to the body, there is a concern that the connecting member that connects the fluid pressure device and the pipe joint is detached from the body.

  The present invention has been made to solve the above-described problems. Even when the body is formed of a resin material, the fluid tube and the connection member in which a passage through which the fluid flows is formed are removed from the body. An object of the present invention is to provide a pipe joint that is free from fear of being pulled out.

In order to achieve the above object, the present invention provides a resin body into which a fluid tube is inserted and supports the outer wall of the fluid tube;
A chuck provided inside the body and formed with a locking portion that engages with an outer wall of the fluid tube and holds the fluid tube on the body;
A seal member provided inside the body and contacting the outer wall of the fluid tube to prevent fluid leakage;
A release bush that is inserted into the chuck and releases the engagement state of the locking portion with respect to the fluid tube;
A metal ring member that fits to the outer wall of the body, is attached to the body by being caulked and pressed radially inward, and prevents deformation of the body;
It is characterized by providing.

  According to the present invention, since the body is supported by the ring member, the outward deformation is prevented, and the fluid tube is reliably prevented from being detached from the body.

In this case, a pipe joint is inserted into the body, a passage through which a fluid flows is formed, and a connection member that connects the pipe joint and the fluid pressure device,
Another metal ring that fits to the outer wall of the body and holds the connection portion between the pipe joint and the connection member in an airtight or liquid-tight manner by caulking the outer peripheral portion and pressing inward in the radial direction Members,
It is preferable that the pressure fluid is prevented from leaking from the connection portion between the body and the connection member.

The present invention also includes a resin body into which a fluid tube is inserted and supports the outer wall of the fluid tube;
A connection member that is inserted into the body and has a passage through which a fluid flows and is connected to a fluid pressure device;
A metal ring member that fits to the outer wall of the body and holds the connection portion between the pipe joint and the connection member in an airtight or liquid-tight manner by caulking the outer peripheral portion and pressing inward in the radial direction; ,
It is characterized by providing.

  According to the present invention, since the body is supported by the ring member, the outward deformation is prevented, and the connection member is reliably prevented from being detached from the body.

  Further, in this case, the ring member is deformed outward in the radial direction when the ring member is caulked when the ring member is caulked by being pressed substantially uniformly over the entire circumference. This is preferable because the outer diameter of the ring member can be reduced.

  According to the pipe joint according to the present invention, the following effects and advantages can be obtained.

  Since the ring member is caulked and attached to the body of the pipe joint, even if the body is made of a material such as resin, it is prevented from being deformed outward. For this reason, when this pipe joint is used in a high-temperature atmosphere, a force in the direction of releasing the tube from the pipe joint is applied to the fluid tube by an external force or by a pressure fluid flowing inside the pipe joint. However, the fluid tube and the connecting member are reliably prevented from being removed from the body. Further, even when an external force such as an impact is applied to the body, there is no concern that the connecting member is detached from the body. Furthermore, since the outer peripheral portion of the ring member is pressed substantially uniformly over the entire circumference, the outer diameter of the ring member can be reduced and the pipe joint can be downsized.

  A preferred embodiment of a pipe joint according to the present invention will be described below in detail with reference to the accompanying drawings.

  1 and 2, reference numeral 10 indicates a pipe joint according to the present embodiment. The pipe joint 10 has a cylindrical body 12 formed by bending a resin material into a substantially L shape, and a passage 13 is formed in the body 12. A cylindrical connection member 14 having a passage 15 through which a fluid flows is fitted to one end side of the body 12. A bulging portion 16 having a sharp cross section is formed on the outer periphery of the connection member 14, and the bulging portion 16 bites into the body 12, whereby the connection member 14 is prevented from coming off from the body 12. In addition, an O-ring 20 is attached to the outer periphery of the connecting member 14 via an annular groove, and leakage of the pressure fluid flowing through the body 12 is prevented. A male screw portion 22 is formed on the outer peripheral portion on the end side of the connecting member 14, the male screw portion 22 is screwed into a port of a cylinder, a solenoid valve, etc. (not shown), and the pipe joint 10 is connected to the cylinder, the solenoid valve, etc. .

  On the outer periphery of the body 12, a ring member 24 for tightening the connection portion between the body 12 and the connection member 14 is fitted. The ring member 24 is formed of a metal material, and is attached to the body 12 by caulking the outer peripheral portion 26 thereof.

  A first step portion 28 and a second step portion 30 are formed on the inner wall on the other end side of the body 12, and a flange portion 36 of a sleeve 34 constituting the attachment / detachment mechanism 32 is engaged with the first step portion 28. To do. An inclined portion 37 is formed on the outer periphery of the flange portion 36, and the sleeve 34 is prevented from coming off from the body 12 when the inclined portion 37 bites into the body 12. A packing (seal member) 38 is attached to the second step portion 30, and one end portion of the collet 40 abuts against the packing 38. As shown in FIG. 3, the collet 40 has a plurality of slits 42 formed on one end side. Therefore, one end portion of the collet 40 can be elastically expanded and contracted.

  A cylindrical guide member 44 is inserted between the outer wall at the other end of the collet 40 and the inner wall of the body 12. A bulging portion 45 having a sharp cross section is formed on the outer periphery of the guide member 44, and the bulging portion 45 bites into the body 12, whereby the guide member 44 is prevented from coming off from the body 12. Inside the collet 40 is inserted a chuck 46 made of a metal material having elasticity and formed in a substantially cylindrical shape. One end of the chuck 46 is formed as a locking portion 48 that gradually decreases in diameter, and the locking portion 48 contacts the packing 38. In addition, a plurality of slits 50 are formed on one end side of the chuck 46, and the locking portion 48 of the chuck 46 can be elastically displaced in the radial direction.

  A release bush 52 is inserted into the chuck 46. A plurality of slits 54 are formed at one end of the release bush 52, and the diameter is gradually reduced to engage with the inner wall of the locking portion 48 of the chuck 46. At the other end of the release bush 52, a flange portion 56 protruding outward in the radial direction is formed.

  Ring members 58 a and 58 b are fitted on the outer periphery of the body 12 so as to be positioned on the outer periphery of the attaching / detaching mechanism 32. The ring members 58a and 58b are formed of a metal material, and are attached to the body 12 by caulking the outer peripheral portion 60 thereof.

  The ring members 58a and 58b are not limited to two, and may be one, or three or more.

  The pipe joint 10 according to the present embodiment is basically configured as described above. Next, a caulking device 70 for caulking the ring member 24 will be described with reference to FIG.

  The caulking device 70 includes a base 72, a circular base 74 is formed at the center of the base 72, and a columnar member 76 is fixed to the center of the base 74. In the vicinity of the end portion of the columnar member 76, a stepped portion 78 that engages with the inner wall of the connecting member 14 is formed. As shown in FIG. 5, a plurality of caulking members 80 are disposed on the base portion 74 so as to surround the columnar member 76, and the caulking members 80 are slidable on the base portion 74. Adjacent caulking members 80, 80 are spaced apart from each other by a gap 81 before caulking. A pin member 82 is fixed to the lower portion of the caulking member 80, and the pin member 82 engages with a groove portion 84 formed in the base portion 74, so that the caulking member 80 is prevented from rotating. A protruding portion 86 that protrudes toward the pipe joint 10 is formed on the upper portion of the caulking member 80, and a caulking portion 88 that engages with the ring member 24 is formed on the protruding portion 86 as shown in FIG. In the upper part and the lower part of the part 88, holding parts 90 a and 90 b that protrude further toward the pipe joint 10 are formed. When the divided caulking members 80 are displaced toward the pipe joint 10 and the adjacent caulking members 80 and 80 abut against each other, the caulking portion 88 is formed so as to match the outer peripheral shape of the caulking ring member 24. Is done. A conical surface 92 is formed on the surface of the caulking member 80 opposite to the cylindrical member 76.

  A substantially ring-shaped pressing member 94 is provided on the base 72 so as to surround the caulking member 80, and the inner wall 96 of the pressing member 94 is formed by gradually increasing the diameter downward. A plurality of guide shafts 98 are provided below the pressing member 94, and the guide shafts 98 can be inserted through guide holes 100 formed in the base 72. A drive source such as a cylinder (not shown) is connected to the lower portion of the guide shaft 98, and when the drive source is biased, the pressing member 94 is displaced in the vertical direction.

  Next, the caulking device 110 that caulks the ring members 58a and 58b of the pipe joint 10 will be described. The same components as those in the caulking device 70 described above are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIG. 7, the protrusion 111 formed on the caulking member 80 of the caulking device 110 protrudes toward the pipe joint 10 and includes two caulking parts 112 a corresponding to the ring members 58 a and 58 b of the pipe joint 10. 112b is formed. The upper and lower portions of the caulking portions 112 a and 112 b are formed as pressing portions 114 a to 114 d that further protrude toward the pipe joint 10.

  The caulking devices 70 and 110 are configured as described above. Next, the operation thereof will be described.

  A connecting member 14, a sleeve 34, a packing 38, a collet 40, a guide member 44, a chuck 46 and a release bush 52 are mounted on the body 12 of the pipe joint 10 in advance.

  The ring member 24 and the ring members 58a and 58b are attached to the body 12 through the above preparation steps. At this time, the ring member 24 and the ring members 58a and 58b are not caulked.

  Next, the inner wall of the connection member 14 of the pipe joint 10 is engaged with the stepped portion 78 formed on the cylindrical member 76 of the caulking apparatus 70, and the pipe joint 10 is positioned on the caulking apparatus 70.

  Next, when the pressing member 94 is displaced downward, as shown in FIG. 8, the conical surface 92 of the caulking member 80 is pressed against the inner wall 96 of the pressing member 94, and the caulking member 80 is displaced toward the pipe joint 10. At this time, the gap 81 between the adjacent caulking members 80, 80 is gradually reduced, and the outer peripheral portion 26 of the ring member 24 is engaged with the caulking portion 88.

  Under the further displacement action of the caulking member 80, the gap 81 disappears, and the adjacent caulking members 80, 80 come into contact with each other. As a result, the caulked portion 88 that has been divided comes into contact and becomes circular, and the caulked portion 88 presses the outer peripheral portion 26 of the ring member 24 substantially uniformly over the entire circumference. For this reason, the ring member 24 is caulked, and is attached so as to be deformed so that the diameter thereof is reduced and bite into the outer wall of the body 12.

  At this time, the ring member 24 is deformed so as to bulge in the vertical direction, but the upper and lower portions of the ring member 24 are pressed by the pressing portions 90a and 90b of the caulking member 80, and the deformation is restricted (see FIG. 6). Therefore, there is no concern that the ring member 24 protrudes from the caulking portion 88, and the ring member 24 is not deformed radially outward.

  When the caulking operation of the ring member 24 is completed, the ring members 58a and 58b are then caulked. In this case, when the attaching / detaching mechanism 32 of the pipe joint 10 is attached to the cylindrical member 76 of the caulking device 110 and the pressing member 94 is displaced downward as described above, the plural caulking members 80 approach the pipe joint 10. The caulking portions 112a and 112b press the outer peripheral portions 60 of the ring members 58a and 58b substantially uniformly over the entire circumference. Accordingly, the ring members 58a and 58b are caulked and attached so as to bite into the outer wall of the body 12 (see FIG. 7).

  The pipe joint 10 in which the ring member 24 and the ring members 58a and 58b are caulked as described above is attached to, for example, a cylinder or a solenoid valve. In this case, the male thread portion 22 of the connection member 14 is screwed into a port such as a cylinder or a solenoid valve.

  In addition, a fluid tube 102 having a passage 101 through which a fluid flows is connected to the attachment / detachment mechanism 32. The fluid tube 102 is inserted between the sleeve 34 and the release bush 52, and one end portion of the fluid tube 102 is brought into contact with the flange portion 36. In such a state, when the fluid tube 102 is slightly pulled out of the pipe joint 10, the locking portion 48 of the chuck 46 bites into the outer wall of the fluid tube 102. In this state, when the fluid tube 102 is to be removed from the pipe joint 10, the locking portion 48 further bites into the outer wall of the fluid tube 102, thereby preventing the fluid tube 102 from being removed. On the other hand, when the flange portion 56 of the release bush 52 is pressed toward the inside of the pipe joint 10, the distal end portion of the release bush 52 presses the locking portion 48 of the chuck 46 radially outward to expand the diameter. Since the biting state of the locking portion 48 with respect to the outer wall of the working tube 102 is released, the fluid tube 102 can be easily removed.

  Even when the pipe joint 10 is used in a high temperature atmosphere or a relatively high pressure is applied to the inside of the pipe joint 10 by a pressure fluid, the ring member 24 and the ring members 58a and 58b are caulked on the body 12. Therefore, the body 12 is prevented from being deformed outward, and the concern that the connecting member 14 and the fluid tube 102 are detached from the body 12 is eliminated. Even if an external force such as an impact is applied to the body 12, there is no concern that the connecting member 14 is detached from the body 12.

  Further, since the connection portion between the body 12 and the fluid tube 102 and the connection portion between the body 12 and the connection member 14 are tightened by the ring members 24, 58a, 58b, the airtight or liquid tightness is maintained. can do.

  In the present embodiment, the connecting member 14 is attached to the body 12 of the pipe joint 10, but the connecting member 14 is not attached, and a threaded portion (not shown) is formed directly on the body 12. You may comprise so that it may screw in into ports, such as a cylinder which is not shown in figure.

It is a side view of a pipe joint concerning an embodiment of the invention. It is a longitudinal cross-sectional view of the pipe joint of FIG. It is a disassembled perspective view of the pipe joint of FIG. It is a longitudinal cross-sectional view of the crimping apparatus which crimps the ring member with which the pipe joint of FIG. 1 is mounted | worn. FIG. 5 is a partially omitted perspective view of the caulking device of FIG. 4. FIG. 5 is a partially enlarged longitudinal sectional view of the caulking device and the connecting member of FIG. 4. FIG. 5 is a partially enlarged longitudinal sectional view of the caulking device and the attachment / detachment mechanism of FIG. 4. It is a longitudinal cross-sectional view of the state which shows the usage method of the crimping apparatus of FIG. 4, and the crimping member is crimping the ring member.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Pipe joint 12 ... Body 14 ... Connection member 24, 58a, 58b ... Ring member 32 ... Detachment mechanism 46 ... Chuck 48 ... Locking part 52 ... Release bush 70, 110 ... Caulking device 80 ... Caulking member 88, 112a, 112b ... Caulking part 102 ... Fluid tube

Claims (4)

A resin body in which a fluid tube is inserted and supports the outer wall of the fluid tube;
A chuck provided inside the body and formed with a locking portion that engages with an outer wall of the fluid tube and holds the fluid tube on the body;
A seal member provided inside the body and contacting the outer wall of the fluid tube to prevent fluid leakage;
A release bush that is inserted into the chuck and releases the engagement state of the locking portion with respect to the fluid tube;
A metal ring member that fits to the outer wall of the body, is attached to the body by being caulked and pressed radially inward, and prevents deformation of the body;
A pipe joint comprising: In the pipe joint according to claim 1,
A connection member that is inserted into the body and forms a passage through which fluid flows, and connects the pipe joint and the fluid pressure device;
Another metal ring that fits to the outer wall of the body and holds the connection portion between the pipe joint and the connection member in an air-tight or liquid-tight manner by caulking the outer peripheral portion and pressing inward in the radial direction Members,
A pipe joint comprising: A resin body in which a fluid tube is inserted and supports the outer wall of the fluid tube;
A connecting member that is inserted into the body and has a passage through which a fluid flows and is connected to a fluid pressure device;
A metal ring member that fits to the outer wall of the body and holds the connection portion between the pipe joint and the connection member in an airtight or liquid-tight manner by caulking the outer peripheral portion and pressing inward in the radial direction; ,
A pipe joint comprising: In the pipe joint according to any one of claims 1 to 3,
The ring member is formed in a substantially circular shape when the outer peripheral portion thereof is pressed and caulked almost uniformly over the entire circumference.

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