JP6535455B2 - Pipe joint and method of manufacturing pipe joint - Google Patents

Description

  The present invention relates to a pipe joint having a male type male joint and a female type female joint, in which a flow path is formed.

  2. Description of the Related Art A quick joint using a valve is conventionally known as a pipe joint between hoses for transferring a fluid such as water or oil under high pressure.

  This quick joint is composed of a male type male joint and a female type female joint, and a channel portion is formed in each of the male joint and the female joint. Valves are respectively provided in the flow passage portions of the male joint and the female joint, and the tips of the respective valves are arranged to face each other. Each valve is axially movable by a spring, and can close and open the flow passage.

  When the male joint is inserted into the female joint, the respective valves are butted together and the respective valves are pushed axially against the force of the spring. Thereby, the flow path part of a male joint and a female joint is open | released, and a fluid passes through a flow path part (for example, refer patent document 1).

Patent No. 4346325

  The pipe joint described in Patent Document 1 includes a built-in valve capable of opening and closing an inner passage formed in the valve, and the residual pressure remaining in the male joint or the female joint is released from the inner passage by moving the built-in valve. This enables the worker to easily connect the male joint to the female joint by hand.

  However, the pipe joint described in Patent Document 1 includes a plurality of members separate from the built-in valve, such as a stopper for restricting the movement of the built-in valve and a communicating body in contact with the built-in valve. Assembly of the joint is not easy.

  The present invention is made in view of the above-mentioned fact, and an object of the present invention is to provide a manufacturing method of a pipe joint and a pipe joint whose number of parts can be reduced and assembly is easy.

The pipe joint according to claim 1 of the present invention is cylindrical, and a male joint in which a first on-off valve for opening and closing a flow passage in the cylinder is disposed movably along the flow passage, and And a concave insertion portion into which the male joint is inserted, the second opening / closing opening / closing the flow passage in the cylinder in contact with the first on-off valve when the male joint is inserted into the concave insertion portion A female joint in which a valve is movably disposed along the flow path, and a recess formed in at least one of contact surfaces formed at the tips of the first on-off valve and the second on-off valve A spherical valve formed along the axis of the first on-off valve or the second on-off valve, communicating with the bottom of the recess, and having a communication hole smaller in inside diameter than the inside diameter of the recess; A sub valve including a body and a spring for biasing the valve body, and a sub valve integrally formed on the periphery of the recess; A holding portion for holding the tip of the valve body in a state where the valve body abuts with a ring and causes the tip end of the valve body to protrude from the contact surface; and the first on-off valve and the second on-off valve When the valve body is brought into abutment, the valve body is pressed, and a gap is formed between the valve body and the holding portion.

  According to the above configuration, the first on-off valve and the second on-off valve are respectively provided with abutting surfaces that abut each other, and the sub valve including the valve body and the spring in the recess formed in at least one of the abutting surfaces is The valve body of the sub valve is held by the holding portion with the tip of the sub valve protruding from the contact surface. Therefore, by pushing the sub valve into the recess and opening the sub valve, the residual pressure remaining in the male joint or the female joint can be released through the communication hole communicating with the bottom of the recess.

  Here, since the inner diameter of the communication hole is smaller than the inner diameter of the recess, the spring of the sub valve is held at the bottom of the recess. Further, the valve body of the sub valve is held by the holding portion integrally formed on the peripheral edge of the recess. Therefore, it is not necessary to provide a separate member to hold the sub valve, and the number of parts can be reduced.

  The pipe joint according to claim 2 of the present invention is the pipe joint according to claim 1, wherein the contact portion of the holding portion with the valve body is curved along the shape of the valve body. .

  According to the above configuration, since the contact portion of the holding portion with the valve body is curved along the shape of the valve body, there is less possibility of a gap between the holding portion and the valve body, and the seal of the sub valve It is possible to improve the quality.

The pipe joint according to claim 3 of the present invention is the pipe joint according to claim 1 or 2, wherein the hardness of the first on-off valve is lower than the hardness of the valve body.

According to the above configuration, since the hardness of the first on-off valve is lower than the hardness of the valve body, it becomes easy to deform the holding portion formed on the first on-off valve along the valve body.

A method of manufacturing a pipe joint according to claim 4 of the present invention is the method of manufacturing a pipe joint according to any one of claims 1 to 3, wherein the first on-off valve or the second on-off valve The holding portion is formed to project vertically along the axial direction from the periphery of the recess of the contact surface, and the sub valve is accommodated in the recess, and then the contact surface is used as the first on-off valve or the second By pressing in the axial direction of the on-off valve, the holding portion is deformed inward in the radial direction of the recess to flatten the contact surface .

According to the above configuration, the holding portion protruding vertically along the axial direction from the peripheral edge of the recess is formed, and after the sub valve is accommodated in the recess, the holding portion is pressed radially inward of the recess by pressing the contact surface. It is deformed to flatten the contact surface . That is, only by deforming the holding portion, the sub valve can be held in a state of being accommodated in the recess. For this reason, it is possible to easily assemble the pipe joint.

  A method of manufacturing a pipe joint according to a fifth aspect of the present invention is the method of manufacturing a pipe joint according to the fourth aspect, wherein the valve is formed after the holding portion is deformed radially inward of the recess. By pressing the body against the holding portion, the contact portion of the holding portion with the valve body is curved along the shape of the valve body.

  According to the above configuration, since the contact portion of the holding portion with the valve body is curved along the shape of the valve body by pressing the valve body to the holding portion, the shape of the holding portion is easily changed to the shape of the valve body It can be kept along.

  According to the present invention, it is possible to provide a pipe joint and a method of manufacturing the pipe joint which can reduce the number of parts and which is easy to assemble.

It is a pipe joint concerning an embodiment of the present invention, and is a half cutting sectional view showing a state where a male joint and a female joint are separated. It is a pipe joint concerning an embodiment of the present invention, and is a half cutting sectional view showing a state where a male joint and a female joint are connected. It is sectional drawing which shows the moving valve of the pipe joint which concerns on embodiment of this invention. (A)-(E) are process drawings which show the assembly process of the moving valve of the pipe joint which concerns on embodiment of this invention.

  Hereinafter, an embodiment of a pipe joint of the present invention will be described based on the drawings.

(Whole configuration)
As shown in FIGS. 1 and 2, the pipe joint 10 is a so-called quick joint (coupler), and includes a male joint 12 which is a male fitting and a female joint 32 which is a female fitting. The male joint 12 is connected to one pipe not shown, and the female joint 32 is connected to the other pipe not shown.

  A sleeve 60 for connecting the female joint 32 and the male joint 12 is provided on the outer peripheral surface of the female joint 32. Further, the male joint 12 and the female joint 32 are provided with a moving valve 14 as a first on-off valve and a moving valve 34 as a second on-off valve, the tips of which are opposed to each other.

  The male joint 12 is provided with a substantially cylindrical male joint main body 13, and on the inner peripheral side of the male joint main body 13, a flow passage 26 through which fluid can pass and which is opened and closed by the moving valve 14 is formed. . Further, a locking member 16 is fitted into the inside of the male joint main body 13, and the movable valve 14 is axially movably held by the locking member 16 via a spring 18. In addition, the movement valve 14 side is inserted in the concave insertion part 50 of the female coupling 32 mentioned later.

  The locking member 16 is axially fixed in the male joint main body 13 by being locked to the stop ring 20 fitted in the groove of the male joint main body 13. A regulating portion 16A that supports the inner side surface is provided. In addition, a reduced diameter portion 22 whose inner diameter is gradually reduced is formed at the tip of the male joint main body 13.

  The moving valve 14 has its tip end side gradually reduced in diameter along the shape of the reduced diameter portion 22, and a rubber ring-shaped sealing member 24 is provided at a position in contact with the reduced diameter portion 22. The moving valve 14 is pressed by the spring 18 against the reduced diameter portion 22, and the seal member 24 is in contact with the reduced diameter portion 22.

  A protrusion 15 having a contact surface 15A is formed at the tip of the movable valve 14, and the protrusion 15 protrudes in the axial direction from the tip of the male joint main body 13. The projection 15 is configured such that the abutment surface 15A is abutted against the abutment surface 35A of the projection 35 of the moving valve 34 on the female joint 32 side.

  Further, on the outer periphery of the male joint main body 13, there is formed a groove-like concave portion 13A for receiving hard balls 58 described later when inserted into the concave insertion portion 50. The male joint 12 is fixed in the concave insertion portion 50 by the hard ball 58 being accommodated in the recess 13A.

  On the other hand, the female joint 32 has a substantially cylindrical shape, and a flow passage 76 opened and closed by the moving valve 34 is formed inside. The female joint 32 is formed with a concave insertion portion 50 into which the male joint 12 is inserted. A locking member 36 is fitted inside the female joint body 33 on the back side of the concave insertion portion 50, and the movable valve 34 is axially movably held by the locking member 36 via a spring 38. .

  The locking member 36 is axially fixed in the female joint main body 33 by being locked to the stop ring 40 fitted in the groove of the female joint main body 33, and the locking member 36 is provided with the spring 38. A regulating portion 36A that supports the inner side surface is provided. In addition, on the insertion opening side of the concave insertion portion 50, a reduced diameter portion 42 in which the inner diameter of the female joint main body 33 is gradually reduced is formed.

  The moving valve 34 has its tip end side gradually reduced in diameter along the shape of the reduced diameter portion 42, and a rubber ring-shaped sealing member 44 is provided at a position in contact with the reduced diameter portion 42. The moving valve 34 is pressed against the reduced diameter portion 42 by the spring 38, and the seal member 44 is in contact with the reduced diameter portion 42.

  A protrusion 35 having a contact surface 35A is formed at the tip of the movement valve 34. The contact surface 35A of the protrusion 35 is a contact surface of the protrusion 15 of the movement valve 14 on the male joint 12 side. It is configured to abut against 15A. In the inside of the concave insertion portion 50, the distal end side of the reduced diameter portion 42 is expanded in diameter, an annular groove 46 is formed in the enlarged diameter portion, and the O-ring 48 is fitted in the groove 46.

  The sleeve 60 has a cylindrical shape and is mounted on the side of the female joint 32 connected to the male joint 12. Inside the sleeve 60, a stepped portion 52 is formed on the outer peripheral surface of the female joint main body 33, and a plurality of holes 54 of trapezoidal cross section expanding in the radially outward direction are formed on the same peripheral surface in the stepped portion 52 There is. Hard balls 58 as fixing members are accommodated in the plurality of holes 54, respectively. The hard balls 58 can be formed of, for example, stainless steel.

  A step 64 is formed on the inner peripheral side of the sleeve 60 so as to face the step 52, and a coil spring 62 is fitted between the step 52 and the step 64. The sleeve 60 is axially movable, and is biased toward the male joint 12 (leftward in FIG. 1) by a coil spring 62.

  Furthermore, a circumferential groove 56 is formed on the tip end side of the stepped portion 52. A retaining ring 68 is attached to the circumferential groove 56, and the sleeve 60 is prevented from coming off by causing the outer periphery of the retaining ring 68 to protrude to the enlarged diameter portion 74 of the sleeve 60 facing the circumferential groove 56.

  Further, a lock fixing screw hole 33A is formed in the female joint main body 33, and a lock member 78 is screwed into the lock fixing screw hole 33A. On the other hand, on one end side 72A of one pipe side (right side in FIG. 1) of the sleeve 60, a release groove 66 into which the lock member 78 is inserted is formed.

  An inner peripheral surface 70 which is a contact surface of the hard ball 58 is formed on the inner periphery of the sleeve 60, and the inner peripheral surface 70 is formed to have an inner diameter smaller than the inner diameter of the step portion 64. As shown in FIG. 1, when the sleeve 60 is moved to the other piping side (right direction in FIG. 1) with respect to the female joint main body 33, the hard ball 58 is disposed at a position corresponding to the enlarged diameter portion 74.

  At this time, the hard ball 58 can move radially outward so as not to protrude from the inner circumference of the female joint main body 33. When the hard ball 58 moves outward in the radial direction of the female joint body 33, the hard ball 58 is disengaged from the recess 13A, allowing relative movement of the male joint 12 and the female joint 32 in the disengaging direction, and mutual disengagement is maintained. The position of the sleeve 60 at this time is referred to as a release position P2.

  On the other hand, as shown in FIG. 2, when the hard ball 58 is in contact with the inner circumferential surface 70, the hard ball 58 is pushed radially inward of the female joint main body 33 and protrudes inward from the inner circumferential surface of the female joint main body 33. When the hard ball 58 is pushed by the inner circumferential surface 70 when the male joint 12 is inserted into the concave insertion portion 50 and the hard ball 58 is contained in the recess 13A, the relative movement of the male joint 12 and the female joint 32 in the removal direction Are blocked and the male joint 12 is fixed in the concave insert 50. The position of the sleeve 60 at this time is taken as a fixed position P1.

  The sleeve 60 is normally biased by the coil spring 62 and disposed at the fixed position P1. At this time, the sleeve 60 is rotated in the circumferential direction to shift the position of the release groove 66 in the circumferential direction from the position of the lock member 78, thereby moving the sleeve 60 in the direction toward the disengaging position P2 (right direction in FIG. 2). To prevent separation of the female joint 32 and the male joint 12.

(Configuration of moving valve)
As shown in FIG. 3, a cylindrical recess 80 is formed on the contact surface 15 A of the projection 15 of the movable valve 14, and the sub valve 82 is accommodated in the recess 80.

  The sub valve 82 includes a spherical valve body 84 and a spring 86 for biasing the valve body 84 in the direction of the contact surface 15A. One end of the spring 86 is in contact with the bottom 80A of the recess 80. The valve body 84 is made of a hard material such as stainless steel, and the diameter of the valve body 84 is smaller than the inner diameter of the recess 80.

  Further, at the peripheral portion of the recess 80, a holding portion 88 projecting radially inward of the recess 80 is integrally molded over the entire circumference. When the valve body 84 abuts on the contact portion 88A of the holding portion 88, the valve body 84 is held in the recess 80 in a state where the tip protrudes from the contact surface 15A, and the valve body 84 is removed from the recess 80 It is prevented.

  The contact portion 88A of the holding portion 88 is curved along the shape of the valve body 84. The moving valve 14 and the holding portion 88 integrally formed with the moving valve 14 are made of a material having a Vickers hardness defined in JIS Z 2244 lower than a hard material such as stainless steel constituting the valve body 84. For example, it is made of carbon steel material for machine structure such as S20C specified in JIS G4051.

  Further, in the moving valve 14, a communication hole 90 as a flow path is formed along the axis of the moving valve 14. One end of the communication hole 90 is in communication with the bottom 80A of the recess 80, and the other end is in communication with the end of the movable valve 14 opposite to the contact surface 15A. The inner diameter of the communication hole 90 is smaller than the inner diameter of the recess 80.

(Method of manufacturing moving valve)
Next, a method of housing the sub valve 82 in the recess 80 of the moving valve 14 will be described. First, before the sub valve 82 is accommodated, as shown in FIG. 4A, the holding portion 88 at the peripheral portion of the recess 80 vertically protrudes from the contact surface 15A of the movable valve 14.

  Next, as shown in FIG. 4B, the sub valve 82 is accommodated in the recess 80 of the moving valve 14 in the order of the spring 86 and the valve body 84. Then, as shown in FIG. 4C, the movable valve 14 is held by a jig 92, and the pressing surface 94A presses the contact surface 15A in the axial direction of the movable valve 14 with a predetermined load.

  At this time, the holding portion 88 is pressed by the pressing jig 94 and is deformed in the radially inward direction of the recess 80. When the holding portion 88 is deformed, as shown in FIG. 4D, the contact portion 88A of the holding portion 88 abuts on the valve body 84, and the sub valve 82 is prevented from coming off from the recess 80.

  Thereafter, as shown in FIG. 4E, the contact surface 15A of the movable valve 14 is held by the jig 96, and the press jig 98 is inserted into the recess 80 from the communication hole 90 side to hold the valve body 84. The contact portion 88A of the portion 88 is pressed with a predetermined load.

  At this time, since the holding portion 88 is made of a material having a hardness lower than that of the valve body 84, the contact portion 88A of the holding portion 88 deforms into a curved shape along the shape of the valve body 84. The movement valve 14 in which the sub valve 82 is accommodated in the recess 80 is manufactured by the above process.

(Action, effect)
When connecting the male joint 12 and the female joint 32, as shown in FIG. 1, after the sleeve 60 is disposed at the disengagement position P2 against the force of the coil spring 62, the male joint 12 is inserted into the concave insertion portion 50. Inserted inside, the abutment surface 15A of the movable valve 14 and the abutment surface 35A of the movable valve 34 are butted.

  When abutting the abutment surfaces 15A and 35A of the movable valve 14 and the movable valve 34, the valve body 84 of the sub valve 82 projecting from the abutting surface 15A of the movable valve 14 is pressed by the abutting surface 35A of the movable valve 34 It moves to one pipe side (left direction in FIG. 1) against the force of the spring 86.

  At this time, the valve body 84 is separated from the contact portion 88A of the holding portion 88 to form a gap between the valve body 84 and the contact portion 88A, and the residual pressure remaining in the male joint 12 passes through the communication hole 90. The male joint 12 is released from the gap between the valve body 84 and the contact portion 88A.

  Thereafter, when the male joint 12 is inserted further back, the projections 15 and the projections 35 of the movable valves 14 and 34 are pressed, and the movable valves 14 and 34 resist the forces of the springs 18 and 38, respectively. Pushed in. Thereafter, as shown in FIG. 2, when the sleeve 60 is returned to the fixed position P1 by the force of the coil spring 62, the female joint 32 and the male joint 12 are connected.

  In this state, a gap is formed between the seal member 24 and the reduced diameter portion 22 of the movable valve 14 and between the seal member 44 and the reduced diameter portion 42 of the movable valve 34, and the male joint 12 and the female joint 32 The flow paths 26, 76 communicate with each other. Then, the fluid passes through the flow paths 26, 76 under pressure.

  When the male joint 12 and the female joint 32 are separated, as shown in FIG. 1, the flow paths 26 and 76 contact the seal member 24 and the reduced diameter portion 22, and the seal member 44 and the reduced diameter portion 42 It is sealed again at the contact surface. Further, the contact portion 88A of the holding portion 88 abuts on the valve body 84 to seal the recess 80 (communication hole 90).

  In the pipe joint 10 of the present embodiment, the sub valve 82 accommodated in the recess 80 formed in the contact surface 15A of the movable valve 14 is provided. Therefore, by pushing the sub valve into the recess 80 and opening the sub valve 82, the residual pressure remaining in the male joint 12 can be released through the communication hole 90 communicated with the bottom 80A of the recess 80.

  Here, since the inner diameter of the communication hole 90 is smaller than the inner diameter of the recess 80, the spring 86 of the sub valve 82 is held by the bottom 80A of the recess 80, and there is little possibility that the sub valve 82 gets into the communication hole 90. Further, the valve body 84 of the sub valve 82 is held by a holding portion 88 integrally formed on the peripheral portion of the recess 80. That is, since the sub valve 82 can be held only by the moving valve 14 and there is no need to provide a separate holding member, the number of parts can be reduced.

  Further, the hardness of the moving valve 14 is made lower than the hardness of the valve body 84, and by pressing the valve body 84 to the holding portion 88, the contact portion 88A of the holding portion 88 follows the shape of the valve body 84. I am curving. For this reason, the shape of the contact portion 88A of the holding portion 88 can be made to easily conform to the shape of the valve body 84, and the possibility of a gap becoming small between the holding portion 88 and the valve body 84 decreases. Sealability can be improved.

  Further, after the sub valve 82 is accommodated in the recess 80, the holding portion 88 is pressed and deformed by the pressing jig 94, whereby the sub valve 82 is held in the recess 80 by the holding portion 88. That is, when the sub valve 82 is accommodated in the recess 80 and held in the recess 80, the moving valve 14 does not need to be disassembled or the holding portion 88 does not need to be separate from the moving valve 14 10 can be assembled.

(Other embodiments)
Although the present invention has been described by way of an embodiment, the present invention is not limited to this embodiment, and various other embodiments are possible within the scope of the present invention.

  For example, although the sub valve 82 is provided only on the moving valve 14 of the male joint 12, the sub valve 82 may be provided on the moving valve 34 when residual pressure tends to remain on the female joint 32 side.

  In addition, after the holding portion 88 is deformed inward in the radial direction of the recess 80 by the pressing jig 94, the contact portion 88A of the holding portion 88 is deformed into a curved shape by the pressing jig 98. By simultaneously pressing using the tools 94 and 98, the deformation of the holding portion 88 and the deformation of the contact portion 88A may be simultaneously performed. When the sealing performance of the sub valve 82 can be sufficiently ensured, the contact portion 88A of the holding portion 88 may not be curved along the shape of the valve body 84.

10 pipe joint 12 male joint 14 moving valve (first on-off valve)
15A, 35A Abutment surface 26, 76 Flow path 32 Female joint 34 Moving valve (second on-off valve)
Reference Signs List 50 recessed insertion portion 80 recessed portion 80A bottom portion 82 sub valve 84 valve body 86 spring 88 holding portion 88A contact portion 90 communicating hole

Claims (5)

A male joint which is cylindrical and in which a first on-off valve for opening and closing a flow passage in the cylinder is movably disposed along the flow passage;
It has a tubular shape and has a concave insertion portion into which the male joint is inserted, and when the male joint is inserted into the concave insertion portion, the male joint abuts on the first on-off valve to open and close the flow passage in the cylinder. A female joint in which a second on-off valve is movably disposed along the flow path;
A recess formed in at least one of the contact surfaces formed at the tips of the first on-off valve and the second on-off valve;
A communication hole which is formed along the axis of the first on-off valve or the second on-off valve, communicates with the bottom of the recess, and has a smaller inside diameter than the inside diameter of the recess;
A sub valve including a spherical valve body and a spring for biasing the valve body housed in the recess;
A holding portion which is integrally formed around the periphery of the recess and which holds the valve body in a state in which the valve body urged by the spring abuts and the tip of the valve body protrudes from the contact surface;
Equipped with
The pipe joint in which the valve body is pressed when the first on-off valve and the second on-off valve are butted, and a gap is formed between the valve body and the holding portion.   The pipe joint according to claim 1, wherein the contact portion of the holding portion with the valve body is curved along the shape of the valve body.   The pipe joint according to claim 1, wherein the hardness of the first on-off valve or the second on-off valve is lower than the hardness of the valve body. Forming the holding portion vertically projecting in the axial direction from the peripheral edge of the recess of the contact surface of the first opening / closing valve or the second opening / closing valve;
The sub valve is accommodated in the recess,
Thereafter, by pressing the contact surface in the axial direction of the first on-off valve or the second on-off valve, the holding portion is deformed radially inward of the recess to flatten the contact surface. The manufacturing method of the pipe joint of any one of Claims 1-3.   After the holding portion is deformed in the radially inward direction of the recess, the valve body is pressed against the holding portion, so that the contact portion of the holding portion with the valve body has the shape of the valve body. The method for manufacturing a pipe joint according to claim 4, wherein the pipe joint is curved along the same.