JP2016095032A - Cap for joint and capped joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cap for joint and a capped joint capable of restricting a pulling and dropping from a joint and capable of restricting dusts or the like from entering into the joint.SOLUTION: A cap 31 for a joint has a cap part 32 covering an opening of a joint 10. The joint 10 has an inner cylinder part 14 and an outer cylinder part 15 for forming an insertion space 13 into which a resin pipe is inserted. The outer cylinder part 15 is provided with a lid member 20. The cap part 32 is provided with a restricting protrusion 35 extending into the insertion space 13, engaged with an inclination surface 22 of the inner surface of the lid member 20 to restrict a pulling and dropping of the cap part 32. A pair of restricting protrusions 35 are arranged at positions spaced apart and opposing by 180 degrees. The restricting protrusions 35 are formed with engaging protrusions 37 extending toward the inclination surface 22 of the lid member 20.SELECTED DRAWING: Figure 1

Description

  The present invention, for example, in a water supply system or hot water supply system piping system, is attached to an end of a joint when the joint is not used, and a joint cap for preventing dust and the like from entering the joint and the joint cap Relates to a joint with a cap to which is attached.

  Conventionally, in a joint used in a water supply system or a hot water supply system piping system, a pipe insertion space is formed between the inner cylinder part and the outer cylinder part extending in the axial direction of the joint body, A lid is externally fitted to the tube portion. A retaining mechanism is provided between the outer cylinder and the lid to prevent the pipe inserted into the insertion space from coming off, so that the pipe can be prevented from being pulled out when a pulling force is applied to the pipe. Yes. When this type of joint is not used, a dust cap may be attached to the end of the joint to prevent dust and the like from entering the joint.

  The present applicant has already proposed such a dust cap for a joint (see Patent Document 1). The dustproof cap includes a cap portion that covers the opening of the joint, and a gauge portion that is inserted from the cap portion into the inner cylinder portion and held by the inner cylinder portion. When the joint is not used, a dust-proof cap is attached to the end of the joint so that dust or the like does not enter the joint.

JP 2008-25660 A

  However, in the dustproof cap of the conventional configuration described in Patent Document 1, the gauge portion extends straight from the cap portion to the inner space of the inner cylindrical portion of the joint and is only locked to the inner cylindrical portion. Therefore, the locking force of the gauge part with respect to the inner cylinder part is weak. Therefore, the dustproof cap may come off the joint when the joint is transported or when the joint is moved at the installation site. When the dust cap is removed from the joint, dust enters the joint from the end opening of the joint, and the dust adheres to the seal member provided in the joint, so that the sealing performance is not sufficiently developed. There was a problem that water leakage might occur between the pipes.

  Accordingly, an object of the present invention is to provide a joint cap and a joint with a cap that can suppress drop-out from the joint and suppress dust and the like from entering the joint.

  In order to achieve the above object, the joint cap according to claim 1 is used for a joint having an inner cylinder part and an outer cylinder part for forming an insertion space into which a pipe is inserted, A cap for a joint including a cap portion covering the opening of the joint, wherein one side surface of the cap portion extends into the insertion space and engages and restricts falling of the cap portion from the opening. A restriction projection is provided, and on one side surface of the cap portion, a gauge portion indicating an insertion amount of the pipe into the insertion space is protruded so as to be inserted inside the inner cylinder portion, and the gauge portion is The cap portion is configured to extend along the outer peripheral surface of the pipe when one side surface of the cap portion is directed to the end portion of the pipe. Located outside the pipe when it reaches the part Characterized in that it is configured urchin.

  A coupling cap according to a second aspect of the present invention includes a coupling having an inner cylinder part and an outer cylinder part for forming an insertion space into which a pipe is inserted, and a lid attached to the outer cylinder part. A cap for a joint provided with a cap portion that covers the opening of the cap portion, wherein one side surface of the cap portion extends into the insertion space and engages with an inner surface of the lid body to restrict the cap portion from falling off. And a gauge part indicating the amount of insertion of the pipe into the insertion space so as to be inserted inside the inner cylinder part on one side surface of the cap part. Is configured to be along the outer peripheral surface of the pipe when one side surface of the cap portion is directed to the end portion of the pipe, and the regulating protrusion is configured so that one side surface of the cap portion is disposed on the pipe. It is configured to be located outside the pipe when it reaches the end. And said that you are.

  A joint with a cap according to a third aspect of the present invention is a joint having an inner cylinder part and an outer cylinder part for forming an insertion space into which a pipe is inserted, and the joint according to claim 1 or 2. And a cap.

According to the present invention, the following effects can be exhibited.
In the coupling cap of the present invention, the cap portion is provided with a regulation protrusion that extends into the insertion space and engages with the inner surface of the lid body of the coupling. For this reason, when a joint cap is attached to the end of the joint when the joint is not used, the inner surface of the cap is brought into close contact with the end surface of the joint, and the regulation protrusion is inserted into the insertion space of the joint, so that the inner surface of the lid Engage with. Therefore, when a force in the pulling direction is applied to the joint cap due to vibration applied to the joint during transportation of the joint, etc., dropout of the joint cap is regulated by the engagement force between the regulation protrusion and the inner surface of the lid.

  Therefore, according to the joint cap of the present invention, it is possible to suppress the drop-out from the joint and to suppress the entry of dust or the like into the joint.

The half section view showing the state where the joint cap was attached to the joint in one embodiment of the present invention. The perspective view which shows the cap for couplings. The right view which shows the cap for couplings. The front view which shows the cap for couplings. The partial enlarged front view which shows the front-end | tip part of the control protrusion of the coupling cap. Sectional drawing in the 6-6 line of FIG. It is a figure which shows the effect | action of the coupling cap, (a) is sectional drawing which shows the state which started inserting the coupling cap in a coupling, (b) is the state in the middle of inserting the coupling cap in a coupling. Sectional drawing which shows, (c) is sectional drawing which shows the state which completed insertion of the cap for couplings in the coupling. The half sectional view which shows the state which inserted the resin pipe in the insertion space of a coupling. It is a figure which shows the effect | action of the gauge part of the cap for couplings, Comprising: (a) is a perspective view which shows the state which put the gauge part along the edge part of the resin pipe, (b) is a right view of (a), ( c) Front view of (a). The half sectional view which shows the state which mounted | wore with the coupling cap to the coupling which wound the heat insulating material on the outer periphery. It is a figure which shows another example of the cap for couplings, Comprising: (a) is a right view which shows the cap for couplings, (b) is a front view which shows the cap for couplings. It is a figure which shows the further another example of the cap for couplings, Comprising: (a) is a right view which shows the cap for couplings, (b) is a front view which shows the cap for couplings, (c) is a coupling cap in a coupling Sectional drawing which shows the state inserted in.

Hereinafter, an embodiment embodying the present invention will be described in detail with reference to FIGS.
As shown in FIG. 8, the joint 10 includes a cylindrical joint body 12 to which a resin pipe 11 is connected. The joint body 12 is formed of a synthetic resin such as polyphenylene sulfide resin (PPS). The resin pipe 11 is formed of a synthetic resin such as polyolefin (crosslinked polyethylene, polybutene, etc.). Since the joint body 12 is configured symmetrically, only one joint body 12 will be described.

  In the joint body 12, an inner cylinder portion 14 and an outer cylinder portion 15 for forming an insertion space 13 into which the resin pipe 11 is inserted protrude from the inner periphery and the outer periphery. A step portion 15a is provided on the inner end side of the inner peripheral surface of the outer cylinder portion 15, and a locking step 15b is provided on the outer end side from the step portion 15a. An intermediate cylinder 16 made of polyacetal resin (POM) is locked to the locking step 15b. A seal ring 17 made of ethylene-propylene-diene copolymer rubber (EPDM) is disposed in the annular space between the intermediate cylinder 16 and the step portion 15a. When the resin pipe 11 is inserted into the insertion space 13, the seal ring 17 is configured so that the space between the outer peripheral surface of the resin pipe 11 and the inner peripheral surface of the outer cylinder portion 15 is kept watertight. . The inner space of the inner cylinder portion 14 is a flow path 18 through which a fluid such as water flows.

  On the outer peripheral surface of the outer cylindrical portion 15, two locking projections 19 are provided so as to protrude in the axial direction of the joint body 12 so as to extend in the circumferential direction. The lid 20 made of PPS that is externally fitted to the outer cylinder portion 15 is engaged with the engagement protrusions 19 of the outer cylinder portion 15 by engaging the two engagement recesses 21 on the inner peripheral surface thereof. It is connected to the outer cylinder part 15. The distal end portion of the lid 20 is reduced in diameter, and an inclined surface 22 that is reduced in diameter toward the distal end is provided on the inner peripheral surface of the reduced diameter portion.

  A retaining mechanism 23 for retaining the resin pipe 11 inserted into the insertion space 13 is provided between the outer cylinder portion 15 and the lid body 20. The retaining ring 24 constituting the retaining mechanism 23 is made of a metal such as stainless steel, and a plurality of retaining pieces 24a are formed on the inner peripheral portion thereof so as to incline toward the inner end side. The retaining ring 24 is sandwiched between a support body 25 sandwiched between the lid body 20 and the intermediate cylinder body 16 and a split ring 26 described later. When the pulling force acts on the resin pipe 11 inserted into the insertion space 13, the retaining piece 24 a is configured to bite into the outer peripheral portion and prevent the resin pipe 11 from coming off.

  A split ring 26 made of PPS is interposed between the retaining ring 24 and the lid 20 so as to maintain the inclination angle of the retaining piece 24a. The outer peripheral surface of the outer end portion of the split ring 26 is an inclined surface 27 whose diameter decreases toward the outer end side, and the inclined surface 27 is configured to be in sliding contact with the inclined surface 22 of the lid 20. A fastening surface 28 is formed on the inner peripheral portion of the split ring 26. When the pulling force is applied to the resin pipe 11 with the resin pipe 11 inserted into the insertion space 13 of the joint 10, the split ring 26 moves to the outer end side via the retaining ring 24 and tightens. The resin pipe 11 is tightened by the abutting surface 28.

  The outer end side of the inclined surface 22 of the lid 20 is a non-contact surface where the inclined surface 27 of the split ring 26 is not in contact when the resin pipe 11 is not inserted into the joint 10. A retaining mechanism 23 for the resin pipe 11 is constituted by the retaining ring 24, the support body 25, the lid body 20, the intermediate cylinder body 16, the split ring 26, and the like.

  In the insertion space 13, an insertion guide 29 made of polypropylene resin (PP) that is pressed against the distal end surface of the resin pipe 11 and guides insertion of the resin pipe 11 is disposed. Further, a fastening cover 30 made of stainless steel is attached to the outer peripheral surface of the lid 20 with its end locked to the mounting groove 20 a on the outer periphery of the lid 20. 20 is retained and retained.

  As shown in FIGS. 2-4, the cap part 32 which comprises the joint cap 31 is formed in a disk shape with a polypropylene resin etc., and is comprised so that the opening of the said joint 10 edge part may be covered. A grip 33 for projecting the cap 32 to and from the joint 10 protrudes from a part of the cap 32. At the center of one side surface of the cap portion 32, a gauge portion 34 indicating the amount of the resin pipe 11 inserted into the insertion space 13 of the joint 10 is formed so as to protrude in an arc shape in cross section. The gauge portion 34 is inserted into the inner space of the inner cylinder portion 14 when the joint cap 31 is attached to the joint 10.

  Similarly, a pair of flat plate-like restricting projections 35 extend in a direction perpendicular to the cap portion 32 at positions on one side of the cap portion 32 that are opposed to each other by 180 degrees. As shown in FIG. 5, the tip portions of the pair of restricting protrusions 35 are bent portions 36 that are bent toward each other, and a semi-cylindrical engagement is formed on the outer surface side of the base portion of the bent portion 36. The protrusion 37 is formed to bulge so as to extend in the entire width direction of the restricting protrusion 35. Since the restricting protrusion 35 is formed in a flat plate shape and the engaging protrusion 37 is formed so as to extend in the entire width direction, the engaging force of the inner surface of the lid 20 with respect to the inclined surface 22 can be increased. In addition, the bending portion 36 can smoothly insert the restriction projection 35 into the lid body 20 and can stably engage the engagement protrusion 37 with the inclined surface 22 of the lid body 20. it can.

  As shown in FIG. 6, the regulation protrusion 35 and its bent portion 36 are formed such that the outer surface swells in an arc shape to improve the strength. As shown in FIG. 1, when the joint cap 31 is attached to the joint 10, the restriction projection 35 extends into the insertion space 13, and the engagement protrusion 37 engages with the inclined surface 22 of the lid 20. Thus, the dropout of the joint cap 31 from the joint 10 is regulated.

  As shown in FIGS. 9A and 9B, the gauge portion 34 is configured to follow the outer peripheral surface of the resin pipe 11 when the cap portion 32 is directed to the end surface of the resin pipe 11. . For this reason, the radius of the arc of the gauge portion 34 is determined corresponding to the size of the resin pipe 11. Then, as shown in FIGS. 9A and 9C, in this state, a mark line 38 indicating the insertion length of the resin pipe 11 can be drawn along the distal end surface of the gauge portion 34. Yes.

Next, the effect | action is demonstrated about the cap 31 for couplings comprised as mentioned above.
When the joint cap 31 is attached to the joint 10, as shown in FIG. 7A, the grip part 33 of the cap part 32 is gripped and the gauge part 34 is inserted into the inner space of the inner cylinder part 14. As a result, the leading ends of the restricting projections 35 reach the outer end of the lid 20 of the joint 10 and are inserted inside thereof. At this time, since the bent portion 36 bent inward is formed at the distal end portion of the restricting projection 35, it is inserted smoothly while avoiding the distal end portion of the restricting projection 35 from hitting the outer end portion of the lid 20. can do.

  Subsequently, as shown in FIG. 7B, when the restricting projection 35 is further inserted into the insertion space 13 by pushing the cap portion 32 into the joint 10 side with a finger, the engaging projection 37 becomes the lid. The restricting projection 35 moves while being bent inward by being brought into sliding contact with the inner peripheral surface of the tip 20. Then, as shown in FIG. 7C, when the side surface (inner surface) of the cap portion 32 on the side of the restricting projection 35 is inserted until it comes into contact with the outer end surface of the lid body 20, the engaging projection portion 37 becomes the inner periphery of the tip end of the lid body 20. It deforms from the surface to the inclined surface 22 side and engages with the inclined surface 22. At this time, since the bent portion 36 that is bent inward is provided at the distal end portion of the restriction projection 35, it is possible to avoid the distal end portion of the restriction projection 35 from interfering with the split ring 26 of the joint 10. .

  In this state, the pair of engaging protrusions 37 are positioned on the outer diameter side from the inner peripheral surface of the tip end of the lid body 20. For this reason, when a force in the extraction direction is applied to the joint cap 31, the force is received by the inclined surface 22 of the lid body 20 through the engaging protrusions 37 of the pair of restricting protrusions 35. Therefore, the dropout of the joint cap 31 from the lid 20 of the joint 10 is suppressed.

The effect obtained by the above embodiment is described collectively below.
(1) In the coupling cap 31 of the present embodiment, the cap portion 32 is provided with a regulation projection 35 that extends into the insertion space 13 and engages the inner surface of the lid body 20. For this reason, when the joint cap 31 is attached to the end portion of the joint 10 when the joint 10 is not used, the inner surface of the cap portion 32 comes into close contact with the outer end surface of the lid body 20, and the restriction projection 35 is inserted into the insertion space of the joint 10. 13 and is engaged with the inner surface of the lid 20. Therefore, when a force in the pulling direction is applied to the joint cap 31 due to vibration applied to the joint 10 when the joint 10 is transported, etc., the joint cap 31 falls off due to the engagement force between the restriction projection 35 and the inner surface of the lid body 20. Is regulated.

Therefore, according to the joint cap 31 of the present embodiment, it is possible to suppress the drop-out from the joint 10, and as a result, it is possible to suppress dust and the like from entering the joint 10, and the function of the seal ring 17 is maintained. There is an effect that can be done.
(2) The restricting protrusion 35 has an engaging protrusion 37 extending toward the inclined surface 22 of the lid 20. Therefore, the engaging protrusion 37 can be easily engaged with the inclined surface 22 of the lid 20 and the engaging force between the engaging protrusion 37 and the inclined surface 22 can be increased.
(3) A pair of the regulation protrusions 35 are provided at positions facing each other by 180 degrees. For this reason, the function of the restricting protrusion 35 can be effectively exhibited, and the effect of preventing the coupling cap 31 from falling off from the joint 10 can be improved.
(4) The cap portion 32 is provided with a gauge portion 34 indicating the amount of insertion of the resin pipe 11 into the insertion space 13 so as to be inserted inside the inner cylinder portion 14. Therefore, it is possible to easily know the insertion amount of the resin pipe 11 with respect to the joint 10 by the gauge portion 34.
(5) The gauge portion 34 is configured to follow the outer peripheral surface of the resin pipe 11 when the cap portion 32 is directed to the end portion of the resin pipe 11. For this reason, the operation of attaching the mark line 38 indicating the amount of insertion to the end of the resin pipe 11 can be easily and quickly performed.

In addition, the said embodiment can also be changed and actualized as follows.
As shown in FIG. 10, when the joint 10 is used in a cold region, the entire outer periphery of the joint 10 is covered with a heat insulating material 39 formed of a synthetic resin foam such as a polyurethane resin foam. . In this case, instead of the joint cap 31 having the structure shown in the above-described embodiment, as shown in FIG. 10, the gripping portion 33 of the cap portion 32 is obliquely outward at the root bent portion 33a. It is preferable to use an inclined one. With this configuration, the joint cap 31 can be easily attached to and detached from the joint 10 without being disturbed by the heat insulating material 39.

  As shown in FIGS. 11A and 11B, a triangular plate-shaped reinforcing rib 41 may be provided between the root of each regulating projection 35 and the side surface of the cap portion 32. When configured in this manner, the strength of the restricting protrusion 35 can be increased to suppress inward tilting, and the engaging force of the restricting protrusion 35 with respect to the inclined surface 22 of the lid 20 can be improved.

  -As shown to Fig.12 (a) and (b), you may form the extension part 36a bent inside at the front-end | tip part of the bending part 36 of the control protrusion 35. As shown in FIG. In this case, as shown in FIG. 12C, when the joint cap 31 is attached to the joint 10, the extending portion 36 a of the restriction projection 35 engages with the outer peripheral surface of the inner cylinder portion 14, and the restriction projection 35 can be spread outward, and the engagement force of the engagement protrusion 37 with respect to the inclined surface 22 of the lid 20 can be increased.

  The grip portion 33 provided on the cap portion 32 of the joint cap 31 may be omitted. In this case, the joint cap 31 can be attached and detached by gripping the periphery of the cap portion 32. Further, when the diameter of the cap portion 32 is smaller than the diameter of the front end portion of the lid 20 of the joint 10, the heat insulating material 39 on the outer periphery of the joint 10 can be extended and formed so as to be longer than the joint 10.

  -You may provide the said control protrusion 35 in one place or three places or more. When the restriction projections 35 are provided at a plurality of locations, it is desirable to provide the restriction projections 35 at equal intervals in the circumferential direction of the cap portion 32 so that the coupling cap 31 can be stably prevented from coming off.

  In the engagement protrusion 37 of the restriction protrusion 35, an inclination corresponding surface along the inclined surface 22 of the lid 20 of the joint 10 may be formed. If comprised in this way, the inclination corresponding | compatible surface of the engagement protrusion 37 will closely_contact | adhere to the inclined surface 22 of the cover body 20, and the engagement force between both can be raised.

-You may change the said control protrusion 35 in shapes, such as square bar shape and round bar shape.
-You may form the engagement protrusion 37 of the said control protrusion 35 in shapes, such as a cone shape, a truncated cone shape, a pyramid shape, a truncated pyramid shape.

The engagement protrusion 37 of the restriction protrusion 35 may be omitted. In this case, it is preferable to set the width of the regulation protrusion 35 formed in a flat plate shape wide.
The gauge portion 34 of the joint cap 31 may be omitted. Also in this case, the joint cap 31 can prevent the joint cap 31 from falling off and can exhibit a dustproof effect.

The coupling cap 31 may be formed of polyethylene (PE) resin or the like.
The joint 10 can be configured such that the joint body 12 is three-way, four-way, or the like.

  -You may form the said coupling main body 12, the cover body 20, etc. with synthetic resins (engineering plastics), such as polyacetal (POM), polyphthalamide (PPA), and polyphenyl sulfone (PPSU).

  As the pipe, in addition to the resin pipe 11, a soft metal pipe such as a copper pipe may be used.

  DESCRIPTION OF SYMBOLS 10 ... Joint, 11 ... Resin pipe, 13 ... Insertion space, 14 ... Inner cylinder part, 15 ... Outer cylinder part, 20 ... Lid body, 22 ... Inclined surface as lid body inner surface, 31 ... Joint cap, 32 ... Cap part, 34 ... Gauge part, 35 ... Restriction protrusion, 37 ... Engagement protrusion.

Claims (3)

A joint cap having a cap portion that covers an opening of the joint, which is used for a joint having an inner cylinder portion and an outer cylinder portion for forming an insertion space into which a pipe is inserted,
One side surface of the cap portion includes a restriction protrusion that extends into the insertion space and restricts the cap portion from falling off the opening.
On one side of the cap part, a gauge part indicating the amount of insertion of the pipe into the insertion space is provided so as to be inserted inside the inner cylinder part,
The gauge portion is configured to be along the outer peripheral surface of the pipe when one side surface of the cap portion is directed to the end portion of the pipe.
The coupling cap, wherein the restricting protrusion is configured to be positioned outside the pipe when one side surface of the cap portion is directed to the end of the pipe. A joint cap having an inner cylinder part and an outer cylinder part for forming an insertion space into which a pipe is inserted, and a cap part covering the opening of the joint fitted with a lid on the outer cylinder part. There,
One side surface of the cap portion includes a regulation protrusion that extends into the insertion space, engages with the inner surface of the lid body, and regulates the cap portion from falling off.
On one side of the cap part, a gauge part indicating the amount of insertion of the pipe into the insertion space is provided so as to be inserted inside the inner cylinder part,
The gauge portion is configured to be along the outer peripheral surface of the pipe when one side surface of the cap portion is directed to the end portion of the pipe.
The coupling cap, wherein the restricting protrusion is configured to be positioned outside the pipe when one side surface of the cap portion is directed to the end of the pipe. A joint having an inner cylinder part and an outer cylinder part for forming an insertion space into which the pipe is inserted;
A joint with a cap, comprising the joint cap according to claim 1.