JP2016089918A - Pipe joint and method of manufacturing pipe joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pipe joint which can decrease the number of components and is easy to assemble, and a method of manufacturing the pipe joint.SOLUTION: A pipe joint 10 comprises: a male joint 12 which has a moving valve 14, opening and closing a flow passage 26 in a cylinder, arranged movably; a female joint 32 which has a recessed insertion part 50 into which the male joint 12 is inserted, and has a moving valve 34, abutting on the moving valve 14 when the male joint 12 is inserted into the recessed insertion part 50 to open and close a flow passage 76 in the cylinder, arranged movably; a recessed part 80 which is formed on at least one of mutually abutting surfaces 15A, 35A of the moving valve 14 and moving valve 34; a communication hole 90 which is formed along an axis of the moving valves 14, 34, and communicates with a bottom part of the recessed part 80 and has an inner diameter smaller than an inner diameter of the recessed part 80; a sub valve 82 which is accommodated in the recessed part 80, and comprises a spherical valve body and a spring energizing the valve body; and a retention part 88 which is molded integrally with a peripheral edge of the recessed part 80, and abuts on the valve body to hold the valve body with a tip of the valve body projected from the abutting surfaces 15A, 35A.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a pipe joint including a male male joint and a female female joint and having a flow path formed therein.

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

  The quick joint is composed of a male male joint and a female female joint, and a flow path portion is formed in each of the male joint and the female joint. Valves are provided in the flow paths of the male joint and the female joint, respectively, and the tips of the valves are arranged to face each other. Each valve is movable in the axial direction by a spring, and can close and open the flow path.

  When the male joint is inserted into the female joint, the respective valves are abutted, and the valves are pushed in the axial direction against the force of the springs. Thereby, the flow path part of a male joint and a female joint is open | released, and a fluid passes a flow path part (for example, refer patent document 1).

Japanese Patent No. 4346325

  The pipe joint described in Patent Document 1 includes a built-in valve that can open and close the 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. Thus, the worker can 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 that restricts the movement of the built-in valve and a communication body that contacts the built-in valve, and has a large number of parts. The assembly of the joint is not easy.

  This invention is made | formed in view of the said fact, and it aims at providing the manufacturing method of the pipe joint and pipe joint which can reduce a number of parts and are easy to assemble.

  A pipe joint according to claim 1 of the present invention is cylindrical, a male joint in which a first on-off valve that opens and closes a flow path in the cylinder is movably disposed along the flow path, And a second opening / closing portion that opens and closes the flow path in the cylinder by contacting 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, a recess formed in at least one of the contact surfaces of the first on-off valve and the second on-off valve, and the first on-off A valve or the second opening / closing valve is formed along the axis, communicates with the bottom of the recess, has a communication hole having an inner diameter smaller than the inner diameter of the recess, and is accommodated in the recess, and has a spherical valve body and the valve body A sub-valve comprising a spring for urging the valve, and a single piece formed at the periphery of the recess, and abuts on the valve body to The tip of the body is provided with a holding portion for holding in a state of protruding from the contact surface.

  According to the above configuration, the first on-off valve and the second on-off valve are provided with contact surfaces that contact each other, and the sub-valve including the valve body and the spring in the recess formed on at least one of the contact surfaces. The sub-valve valve element is held by the holding portion in a state where the tip protrudes 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 a holding portion that is integrally formed on the periphery of the recess. For this reason, it is not necessary to provide a separate member for holding the sub-valve, and the number of parts can be reduced.

  A pipe joint according to a second aspect of the present invention is the pipe joint according to the first aspect, wherein a contact portion of the holding portion with the valve body is curved along a 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 sub valve seal Can be improved.

  A pipe joint according to a third aspect of the present invention is the pipe joint according to the first or second aspect, wherein the hardness of the first on-off valve or the second on-off valve is lower than the hardness of the valve body. Has been.

  According to the above configuration, since the hardness of the first on-off valve or the second on-off valve is lower than the hardness of the valve body, the holding portion formed on the first on-off valve or the second on-off valve is provided as a valve. It becomes easy to deform along the body.

  A pipe joint manufacturing method according to a fourth aspect of the present invention is the pipe joint manufacturing method according to any one of the first to third aspects, wherein the first on-off valve or the second on-off valve is the same. The holding portion that protrudes perpendicularly from the peripheral edge of the concave portion of the contact surface is formed, the sub valve is accommodated in the concave portion, and the contact surface is then axially directed to the first on-off valve or the second on-off valve. The holding portion is deformed inwardly in the radial direction of the concave portion.

  According to the above configuration, the holding portion that protrudes vertically from the periphery of the recess is formed, and after the sub-valve is accommodated in the recess, the holding portion is deformed inward in the radial direction of the recess by pressing the contact surface. That is, the sub-valve can be held in a state of being accommodated in the recess only by deforming the holding portion. For this reason, a pipe joint can be assembled easily.

  A pipe joint manufacturing method according to claim 5 of the present invention is the pipe joint manufacturing method according to claim 4, wherein the valve is formed after the holding portion is deformed radially inward of the recess. By pressing the body against the holding part, the contact part of the holding part 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 against the holding portion, the shape of the holding portion is easily changed to the shape of the valve body. Can be along.

  ADVANTAGE OF THE INVENTION According to this invention, the manufacturing method of a pipe joint and pipe joint which can reduce a number of parts and are easy to assemble can be provided.

It is a pipe joint which concerns on embodiment of this invention, Comprising: It is a half-cut sectional view which shows the state from which the male joint and the female joint are isolate | separated. It is a pipe joint which concerns on embodiment of this invention, Comprising: It is a half cut sectional view which shows the state in which the male joint and the female joint are connected. It is sectional drawing which shows the movement valve of the pipe joint which concerns on embodiment of this invention. (A)-(E) are process drawings which show the assembly process of the movement valve of the pipe joint which concerns on embodiment of this invention.

  Hereinafter, an embodiment of a pipe joint of the present invention is described based on a drawing.

(Overall 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 that is a male fitting and a female joint 32 that 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 opening / closing valve and a moving valve 34 as a second opening / closing valve, respectively, with their tips opposed to each other.

  The male joint 12 includes a male joint body 13 having a substantially cylindrical shape, and a flow path 26 that allows fluid to pass and is opened and closed by the moving valve 14 is formed on the inner peripheral side of the male joint body 13. . Further, a locking member 16 is fitted into the male joint main body 13, and the moving valve 14 is held by the locking member 16 via a spring 18 so as to be movable in the axial direction. The moving valve 14 side is inserted into a concave insertion portion 50 of a female joint 32 described later.

  The locking member 16 is fixed in the axial direction within the male joint body 13 by being locked by a locking ring 20 fitted in the groove of the male joint body 13, and the locking member 16 includes a spring 18. A restricting portion 16A that supports the inner surface is provided. Further, a reduced diameter portion 22 whose inner diameter is gradually reduced is formed at the tip of the male joint body 13.

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

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

  Further, on the outer periphery of the male joint main body 13, a groove-shaped recess 13 </ b> A is formed that receives a hard ball 58 described later when inserted into the recessed insertion portion 50. The male joint 12 is fixed in the concave insertion portion 50 by housing the hard ball 58 in the concave portion 13A.

  On the other hand, the female joint 32 is substantially cylindrical, and a flow path 76 that is 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 moving valve 34 is held by the locking member 36 via a spring 38 so as to be movable in the axial direction. .

  The locking member 36 is fixed in the axial direction within the female joint main body 33 by being locked by a locking ring 40 fitted in the groove of the female joint main body 33, and the locking member 36 includes a spring 38. A restricting portion 36A that supports the inner surface is provided. Further, 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 is gradually reduced in diameter along the shape of the reduced diameter portion 42 at the distal end side, and a rubber ring-shaped seal 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 an abutment surface 35A is formed at the tip of the moving valve 34. The abutment surface 35A is a contact surface of the protrusion 15 of the movement valve 14 on the male joint 12 side. It is comprised so that it may be abutted against 15A. Further, inside the concave insertion portion 50, the diameter of the distal end side is increased from the reduced diameter portion 42, an annular groove portion 46 is formed in the expanded diameter portion, and an O-ring 48 is fitted in the groove portion 46.

  The sleeve 60 has a cylindrical shape and is externally mounted on the connection side of the female joint 32 with 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 trapezoidal cross-section holes 54 that expand radially outward are formed on the same peripheral surface. Yes. In each of the plurality of holes 54, hard balls 58 serving as fixing members are stored. The hard ball 58 can be formed of, for example, stainless steel.

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

  Further, a circumferential groove 56 is formed on the tip 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 projecting the outer periphery of the retaining ring 68 to the enlarged diameter portion 74 of the sleeve 60 facing the circumferential groove 56.

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

  An inner peripheral surface 70 that is a contact surface of the hard sphere 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 stepped portion 64. As shown in FIG. 1, when the sleeve 60 is moved with respect to the female joint body 33 to the other pipe side (the right direction in FIG. 1), 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 periphery of the female joint body 33. When the hard ball 58 moves outward in the radial direction of the female joint main body 33, the hard ball 58 is detached from the recess 13A, and the relative movement in the removal direction of the male joint 12 and the female joint 32 is allowed, and the mutual separation is maintained. The position of the sleeve 60 at this time is set as a separation position P2.

  On the other hand, as shown in FIG. 2, when the hard ball 58 hits the inner peripheral surface 70, the hard ball 58 is pushed inward in the radial direction of the female joint main body 33 and protrudes inward from the inner peripheral surface of the female joint main body 33. When the hard ball 58 is pushed by the inner peripheral surface 70 when the male joint 12 is inserted into the concave insertion portion 50 and the hard ball 58 is housed in the concave portion 13A, the male joint 12 and the female joint 32 are moved relative to each other in the removal direction. And the male joint 12 is fixed in the concave insertion portion 50. The position of the sleeve 60 at this time is defined as a fixed position P1.

  The sleeve 60 is normally urged 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 disengagement position P2 (right direction in FIG. 2). And the separation of the female joint 32 and the male joint 12 can be suppressed.

(Configuration of moving valve)
As shown in FIG. 3, a cylindrical recess 80 is formed on the contact surface 15 </ b> A of the protrusion 15 of the moving 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 that urges the valve body 84 in the direction of the contact surface 15 </ b> A, and one end of the spring 86 is in contact with the bottom 80 </ b> A 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.

  In addition, a holding portion 88 that protrudes inward in the radial direction of the recess 80 is integrally formed at the peripheral portion of the recess 80 over the entire circumference. When the valve body 84 comes into contact with the contact portion 88A of the holding portion 88, the valve body 84 is held in the recessed portion 80 with the tip projecting from the contact surface 15A, and the valve body 84 is prevented from coming off from the recessed portion 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 formed integrally with the moving valve 14 are made of a material whose Vickers hardness defined in JIS Z2244 is lower than a hard material such as stainless steel constituting the valve body 84. For example, it is comprised with carbon steel materials for machine structures, such as S20C prescribed | regulated to JISG4051.

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

(Movement valve manufacturing method)
Next, a method for housing the sub valve 82 in the recess 80 of the moving valve 14 will be described. First, before accommodating the sub-valve 82, as shown in FIG. 4A, the holding portion 88 at the peripheral portion of the recess 80 protrudes from the contact surface 15A of the moving valve 14 in the vertical direction.

  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 moving valve 14 is held by a jig 92, and the contact surface 15 </ b> A is pressed by the pressing jig 94 in the axial direction of the moving valve 14 with a predetermined load.

  At this time, the holding portion 88 is pressed by the pressing jig 94 and is deformed inward in the radial 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 and the valve body 84 come into contact with each other, and the sub valve 82 is prevented from coming off from the concave portion 80.

  Thereafter, as shown in FIG. 4E, the contact surface 15A of the moving 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 lower hardness than the valve body 84, the contact portion 88 </ b> A of the holding portion 88 is deformed into a curved shape along the shape of the valve body 84. The moving valve 14 in which the sub valve 82 is accommodated in the recess 80 is manufactured by the above process.

(Function, effect)
When connecting the male joint 12 and the female joint 32, as shown in FIG. 1, the sleeve 60 is disposed at the disengagement position P <b> 2 against the force of the coil spring 62, and then the male joint 12 is inserted into the concave insertion portion 50. The contact surface 15A of the moving valve 14 and the contact surface 35A of the moving valve 34 are abutted with each other.

  When the contact surfaces 15A and 35A of the moving valve 14 and the moving valve 34 are brought into contact with each other, the valve body 84 of the sub-valve 82 protruding from the contact surface 15A of the moving valve 14 is pressed by the contact surface 35A of the moving valve 34. Then, 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 so that a gap is formed 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. It escapes from the gap between the valve body 84 and the contact portion 88A to the outside of the male joint 12.

  Thereafter, when the male joint 12 is further inserted further, the protrusions 15 and 35 of the movement valves 14 and 34 are pressed, and the movement valves 14 and 34 resist the force 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 P <b> 1 by the force of the coil spring 62, the female joint 32 and the male joint 12 are connected.

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

  In addition, when the male joint 12 and the female joint 32 are separated, as shown in FIG. 1, the flow paths 26 and 76 are brought into contact with the sealing member 24 and the reduced diameter portion 22, and between the sealing 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 and the valve body 84 come into contact with each other to seal the recess 80 (communication hole 90).

  The pipe joint 10 of the present embodiment includes a sub valve 82 accommodated in a recess 80 formed on the contact surface 15A of the moving valve 14. Therefore, the residual pressure remaining in the male joint 12 can be released through the communication hole 90 communicating with the bottom 80A of the recess 80 by pushing the sub valve into the recess 80 and opening the sub valve 82.

  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 80 </ b> A of the recess 80, and there is little possibility that the sub-valve 82 enters the communication hole 90. Further, the valve body 84 of the sub-valve 82 is held by a holding portion 88 that is integrally formed with the peripheral portion of the recess 80. That is, the sub valve 82 can be held only by the moving valve 14, and it is not necessary to provide a separate holding member, so that the number of parts can be reduced.

  Further, the hardness of the movable valve 14 is lower than the hardness of the valve body 84, and the contact portion 88 </ b> A of the holding portion 88 is moved along the shape of the valve body 84 by pressing the valve body 84 against the holding portion 88. It is curved. For this reason, the shape of the contact portion 88A of the holding portion 88 can easily conform to the shape of the valve body 84, and the possibility that a gap is left between the holding portion 88 and the valve body 84 is reduced. It is possible to improve the sealing performance.

  Further, after the sub valve 82 is accommodated in the recess 80, the holding portion 88 is pressed and deformed by the press jig 94, whereby the sub valve 82 is held in the recess 80 by the holding portion 88. That is, it is not necessary to disassemble the moving valve 14 or separate the holding portion 88 from the moving valve 14 when the sub valve 82 is accommodated in the recessed portion 80 and held in the recessed portion 80, so that the pipe joint can be easily connected. 10 can be assembled.

(Other embodiments)
In addition, although an example of embodiment was demonstrated about this invention, this invention is not limited to this embodiment, Other various embodiment is possible within the scope of the present invention.

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

  Further, after the holding portion 88 is deformed inward in the radial direction of the concave portion 80 by the press jig 94, the contact portion 88A of the holding portion 88 is deformed into a curved shape by the press jig 98. By simultaneously pressing the tools 94 and 98, the holding portion 88 and the abutting portion 88A may be deformed simultaneously. In addition, when the sealing performance by the sub valve 82 can be sufficiently ensured, the contact portion 88 </ b> A of the holding portion 88 may not be curved along the shape of the valve body 84.

10 Pipe Fitting 12 Male Fitting 14 Movement Valve (First Open / Close Valve)
15A, 35A Contact surface 26, 76 Flow path 32 Female joint 34 Movement valve (second on-off valve)
50 concave insertion part 80 concave part 80A bottom part 82 sub valve 84 valve body 86 spring 88 holding part 88A contact part 90 communication hole

Claims (5)

A male joint in which a first on-off valve that is cylindrical and that opens and closes a flow path in the cylinder is movably disposed along the flow path;
It is cylindrical and has a concave insertion part into which the male joint is inserted. When the male joint is inserted into the concave insertion part, it contacts the first on-off valve and opens and closes the flow path in the cylinder. A female joint in which a second on-off valve is arranged to be movable along the flow path;
A recess formed in at least one of the contact surfaces of the first on-off valve and the second on-off valve;
A communication hole 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 smaller inner diameter than the inner diameter of the recess;
A sub-valve that is housed in the recess and includes a spherical valve body and a spring that biases the valve body;
A holding part that is integrally formed on the periphery of the recess, and that holds the valve body in a state of contacting the valve body and protruding the tip of the valve body from the contact surface;
A pipe fitting comprising:   The pipe joint according to claim 1, wherein a contact portion of the holding portion with the valve body is curved along a shape of the valve body.   The pipe joint according to claim 1 or 2, 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 projecting vertically from a peripheral edge of the concave portion of the contact surface of the first on-off valve or the second on-off valve;
Storing the sub-valve 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 inward in the radial direction of the recess. A manufacturing method of a pipe joint given in any 1 paragraph.   After the holding portion is deformed inward in the radial direction of the concave portion, the valve body is pressed against the holding portion, whereby the contact portion of the holding portion with the valve body is changed to 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 line.