JP5781378B2 - Protective structure of inner core in joint - Google Patents

Description

  The present invention relates to a joint used for, for example, a water supply system or a hot water supply system piping system, and more particularly to a structure for protecting an inner core of a joint to which a resin pipe is connected during transportation of the joint.

  Conventionally, as a joint used in a water supply system or a hot water system piping system, the end of the resin pipe is expanded and connected to the pipe connection part of the joint body, and a tightening ring is inserted into the expanded diameter part. Clamping ring type joints configured to be tightened are known. According to this joint, the flow path in the joint can be secured with a simple configuration, and the resin pipe can be easily connected.

  Patent Document 1 discloses a soft synthetic resin pipe joint as a fastening ring type joint of this type. The joint includes a connection socket having a pipe connection part, an extension socket connected to the tip of the pipe connection part, and an outer ring for fastening the soft synthetic resin pipe connected to the pipe connection part. When connecting the soft synthetic resin pipe to the joint, the soft synthetic resin pipe is inserted into the extension socket and the pipe connecting portion with the extension socket connected to the tip of the pipe connecting portion, and the Tighten the plastic tube tightly. Thereafter, the outer ring is fitted into the soft synthetic resin tube to tighten the soft synthetic resin tube.

Japanese Patent Laid-Open No. 2000-230684

  By the way, in the joint as described in Patent Document 1, before use, the joint is packed in a state in which the outer ring is loosely fitted to the pipe connection portion of the joint body, and is transported to the place of use in that state. For this reason, there is a possibility that the outer ring repeatedly hits the pipe connecting portion due to vibration during transportation, and the pipe connecting portion is damaged or foreign matters such as dust adhere to the pipe connecting portion. In these cases, when attempting to connect the resin pipe to the pipe connecting portion, it becomes difficult to insert the resin pipe, or the watertightness between the pipe connecting portion and the resin pipe is impaired.

  Furthermore, when a seal ring for keeping water tightness with the resin pipe is attached to the outer peripheral surface of the pipe connecting portion, there is a possibility that foreign matters such as dust adhere to the seal ring. In this case, there is a problem that the water stop performance by the seal ring is deteriorated, and foreign matter is caught and it becomes difficult to insert the resin pipe.

  In addition, when trying to use the joint after unpacking, the outer ring is only loosely fitted into the pipe connection, so there is a risk that the outer ring will fall and be damaged or lost. It was.

  Accordingly, an object of the present invention is to provide an inner core protection structure in a joint that can effectively protect an inner core as a pipe connecting portion until it is used and has excellent connection workability when a pipe is connected. There is.

In order to achieve the above object, the protective structure of the inner core in the joint according to the first aspect of the present invention is such that an inner core for connecting a pipe projects from the joint body, and the pipe is fitted on the inner core. The inner core protection structure in the joint configured to fasten the pipe to the inner core with the tightening ring in a state in which the pipe is attached, and the joint body is provided with a protective cap for protecting the inner core when the joint is not used. The tightening ring is attached to the protective cap, and the attachment force of the protection cap to the flange of the joint body is set to be larger than the attachment force of the fastening ring to the protection cap. Features.

  The protection structure of the inner core in the joint according to claim 2 is the invention according to claim 1, wherein the protective cap is formed in a bottomed cylindrical shape, and the inner peripheral surface of the opening is engaged with the flange of the joint body. An engaging protrusion is provided.

  The protective structure of the inner core in the joint according to claim 3 is the invention according to claim 1 or claim 2, wherein the cylindrical portion of the protective cap is formed in a tapered shape whose diameter increases toward the opening side. Features.

  The protective structure of the inner core in the joint according to claim 4 is the invention according to any one of claims 1 to 3, wherein the protective cap is made of a soft resin.

The inner core protective structure in the joint according to claim 5 is the invention according to any one of claims 1 to 4 , wherein a tightening portion for tightening a pipe is provided on an inner peripheral surface of the tightening ring. When the fastening ring is attached to the protective cap, the fastening portion is configured to be engaged with and held by the outer peripheral surface of the protective cap.

According to the present invention, the following effects can be exhibited.
In the protective structure of the inner core in the joint according to the present invention, the joint body is provided with a protective cap that protects the inner core when the joint is not used, and a fastening ring is attached to the protective cap. Yes. For this reason, when the joint is not used, the inner core of the joint body can be protected by the protective cap, so that the fastening ring can be prevented from hitting the inner core during the transportation of the joint. Also, since the tightening ring is attached to the protective cap, when connecting the pipe to the joint, first remove the tightening ring from the protective cap, then insert the removed tightening ring into the end of the pipe, and then protect This can be done by removing the cap from the inner core, inserting the end of the pipe into the inner core, and tightening with a tightening ring.

Therefore, according to the protection structure of the inner core in the joint of the present invention, the inner core can be effectively protected until it is used, and the connection workability is excellent when the pipe is connected.
In addition, the mounting force of the protective cap on the flange of the joint body is set to be larger than the mounting force of the fastening ring on the protective cap. For this reason, it is possible to prevent the protective cap from being detached from the inner core when the fastening ring is removed from the protective cap.

Sectional drawing which shows the state which mounted | wore with the protection cap which protects an inner core in the coupling main body in embodiment of this invention, and mounted | worn the protection ring with the protection cap. Sectional drawing which shows the state which attached the protective cap which protects an inner core to a coupling main body. Sectional drawing which decomposes | disassembles and shows a coupling main body, a protective cap, and a clamping ring. The perspective view which shows a coupling main body. The perspective view which shows a clamping ring. The perspective view which shows a protective cap. It is a figure which shows the process of connecting a resin pipe to a coupling, Comprising: (a) is sectional drawing which shows the state which inserted the clamping ring in the edge part of the resin pipe, (b) is diameter-expanding the edge part of the resin pipe Sectional drawing which shows the state which carried out, (c) is sectional drawing which shows the state which removed the protective cap from the coupling main body. 7A is a cross-sectional view showing a state in which the expanded diameter portion of the resin pipe is externally fitted to the inner core from the state of FIG. 7C, and FIG. 7B is a resin using a tightening jig from the state of FIG. Sectional drawing which shows the state which clamps a pipe, (c) is sectional drawing which shows the state from which the fastening of the resin pipe was completed from the state of (b).

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments embodying the present invention will be described in detail with reference to FIGS.
As shown in FIGS. 1 and 4, one end side (the right end side in FIG. 1) of a bronze joint body 11 constituting the joint 10 is used as a pipe connection portion for connecting a resin pipe 13 via a flange 12. An inner core 14 is projected. A seal ring 15 made of ethylene-propylene-diene copolymer rubber (EPDM) is fitted into a fitting groove 14 a formed on the outer peripheral surface of the inner core 14, and watertight between the inner core 14 and the resin pipe 13. It is supposed to hold on. A male thread portion 16 is threaded on the other end side of the joint body 11 and is screwed and connected to a pipe body such as a water pipe (not shown). The inner space of the joint body 11 and the inner core 14 is a flow path 17 through which a fluid such as water flows. The resin pipe 13 is formed of a synthetic resin such as polyolefin (crosslinked polyethylene, polybutene, etc.).

  As shown in FIGS. 8A to 8C, when the joint 10 is used, the diameter-enlarged portion 13a at the end of the resin pipe 13 is fitted into the inner core 14, and the resin pipe 13 is made of brass (brass). The tightening ring 18 is externally fitted and tightened. As shown in FIGS. 1 and 5, the tightening ring 18 is formed in a substantially cylindrical shape, and the inner peripheral surface at the center thereof is reduced in diameter to form a tightening portion 19 for tightening the resin pipe 13. As shown in FIG. 1, when the tightening ring 18 is attached to a protective cap 20 described later, the tightening portion 19 is configured to be engaged with and held by the outer peripheral surface of the protective cap 20. . Between the inner peripheral surface of the inner end portion (left end portion in FIG. 1) of the tightening ring 18 and the tightening portion 19, a tapered surface 21 having a diameter increasing toward the inner end side is formed, and the tightening ring 18 is made of resin. When the pipe 13 is tightened, the resin pipe 13 is prevented from bulging and can be tightened smoothly. At positions straddling the inner end of the tightening ring 18 and the tapered surface 21, confirmation windows 22 for confirming whether or not the resin pipe 13 is inserted are opened at four locations at intervals of 90 degrees in the circumferential direction.

  As shown in FIGS. 1 and 2, when the joint 10 is not used, a protective cap 20 made of polyethylene resin as a soft resin is attached to the joint body 11 in order to protect the portion of the inner core 14. As shown in FIGS. 1 and 6, the protective cap 20 is formed in a bottomed cylindrical shape, and the opening thereof becomes a cylindrical portion 23, and the inner peripheral surface of the cylindrical portion 23 is spaced by 90 degrees in the circumferential direction. An engagement protrusion 24 having a circular arc cross section is provided. The protective cap 20 is molded in accordance with a conventional method by an injection molding method. When the protective cap 20 is attached to the joint main body 11, the engagement protrusion 24 of the protective cap 20 engages with the flange 12 of the joint main body 11 so that the protective cap 20 is held out. .

  A peripheral wall closer to the bottom wall 25 than the cylindrical portion 23 of the protective cap 20 is a tapered portion 26 whose diameter increases toward the opening. In a state where the protective cap 20 is mounted so as to cover the inner core 14, the tip of the inner core 14 comes into contact with the bottom wall 25 of the protective cap 20. As shown in FIG. 3, the inclination angle α of the tapered surface 21 on the inner periphery of the tightening ring 18 is set to be larger than the inclination angle β of the tapered portion 26 of the protective cap 20 to protect the tightening ring 18. The cap 20 is configured to be easily attached.

  As shown in FIG. 1, with a protective cap 20 attached so as to cover the inner core 14, a fastening ring 18 is attached to the protective cap 20. When the tightening ring 18 is attached to the protective cap 20, the tightening portion 19 of the tightening ring 18 abuts against the tapered portion 26 of the protective cap 20, and the tapered portion 26 is slightly bent, so that the tightening ring 18 is protected. 20 is held. Specifically, as shown in FIG. 3, the inner diameter b of the tightening portion 19 of the tightening ring 18 is such that the protective cap at a position 26 a before the inner end of the tightening ring 18 contacts the cylindrical portion 23 of the protective cap 20. It is set to be equal to the outer diameter a of 20. Then, the tightening ring 18 can be pushed from the position 26a to the cylindrical portion 23 of the protective cap 20 to be mounted, thereby generating a mounting force. In this case, the mounting force of the protective cap 20 on the flange 12 of the joint body 11 is set to be larger than the mounting force of the fastening ring 18 on the protective cap 20, and protection is achieved when the fastening ring 18 is removed from the protective cap 20. The cap 20 is prevented from being detached from the inner core 14.

Next, the connection method of the resin pipe 13 by the protection structure of the inner core 14 in the joint 10 comprised as mentioned above is demonstrated.
As shown in FIG. 7A, when the joint 10 is used, the fastening ring 18 attached to the protective cap 20 is first pulled out and removed. In this case, the mounting force of the tightening ring 18 with respect to the protective cap 20 is set to be smaller than the mounting force of the protective cap 20 with respect to the flange 12 of the joint body 11, so that when the tightening ring 18 is removed from the protective cap 20. The protective cap 20 does not come off from the joint body 11. Then, the removed fastening ring 18 is fitted into the end of the resin pipe 13.

  Next, as shown in FIG. 7 (b), the diameter of the end of the resin pipe 13 is increased using a diameter expansion jig (not shown) to form an expanded diameter portion 13a. At this time, the diameter is increased so that the inner diameter of the expanded diameter portion 13 a corresponds to the outer diameter of the inner core 14. Then, as shown in FIG.7 (c), the protective cap 20 with which the coupling main body 11 was mounted | worn is removed. This removal can be performed by pulling out the protective cap 20 so as to disengage the engagement protrusion 24 of the soft protective cap 20 from the flange 12 of the joint body 11.

  Thereafter, as shown in FIG. 8A, the diameter-expanded portion 13 a of the resin pipe 13 is inserted into the inner core 14 of the joint body 11. At this time, since the end portion of the resin pipe 13 is expanded by the expanded diameter portion 13 a so as to correspond to the outer diameter of the inner core 14, the expanded diameter portion 13 a of the resin pipe 13 is replaced with the inner core 14 of the joint body 11. Can be easily fitted.

  In this state, as shown in FIGS. 8B and 8C, the tightening ring 18 is tightened so as to be fitted onto the resin pipe 13 with a tightening tool 27 using a hydraulic cylinder. At this time, the tightening portion 19 of the tightening ring 18 tightens the outer peripheral surface of the resin pipe 13, and the portion of the resin pipe 13 swelled by tightening escapes to the space portion 28 formed by the tapered surface 21 of the tightening ring 18. . Therefore, the resin pipe 13 can be smoothly tightened by the tightening ring 18.

Next, the effect | action is demonstrated about the protection structure of the inner core 14 in the coupling 10 comprised as mentioned above.
Until the use of the joint 10, as shown in FIG. 1, a protective cap 20 is attached to the joint body 11, and its engaging projection 24 engages with the flange 12 of the joint body 11. To prevent it from coming off. For this reason, during transportation of the joint 10, the inner core 14 is held with the protective cap 20 covered, and even if an impact is applied to the joint 10, the inner core 14 is protected by the protective cap 20. It is possible to avoid deformation of the part and adhesion of foreign matter.

  Further, a fastening ring 18 is attached to the protective cap 20, and the fastening portion 19 is engaged with and held by the tapered portion 26 of the protective cap 20. For this reason, during the transportation of the joint 10, the tightening ring 18 is held in a state of being attached to the protective cap 20, and the movement of the tightening ring 18 is suppressed. Therefore, it is possible to prevent the tightening ring 18 from rolling and hitting another member.

  When connecting the resin pipe 13 to the joint 10, first, the fastening ring 18 is removed from the protective cap 20, and the removed fastening ring 18 is inserted into the end of the resin pipe 13. Next, the protective cap 20 is removed from the inner core 14, and the end of the resin pipe 13 is inserted into the inner core 14. Thereafter, the resin pipe 13 can be connected to the joint 10 by fastening the resin pipe 13 with the fastening ring 18. For this reason, the fastening ring 18 and the protective cap 20 attached to the joint body 11 can be removed in accordance with the connection procedure of the resin pipe 13, and the resin pipe 13 can be assembled to the joint body 11 in order.

The effects exhibited by the above embodiment will be described collectively below.
(1) In the protection structure of the inner core 14 in the joint 10 according to the present embodiment, the joint body 11 is provided with a protective cap 20, and the protection cap 20 is further provided with a fastening ring 18. Yes. For this reason, when the joint 10 is not used, the inner cap 14 of the joint body 11 can be protected by being covered with the protective cap 20, so that the tightening ring 18 hits the inner core 14 during the transportation of the joint 10. Can be prevented.

  The tightening ring 18 is attached to the protective cap 20. For this reason, it can suppress that the clamping ring 18 remove | deviates and is damaged or lost. When the resin pipe 13 is connected to the joint 10, the fastening ring 18 is removed from the protective cap 20, the fastening ring 18 is inserted into the end of the resin pipe 13, and the protective cap 20 is removed from the inner core 14. The resin pipe 13 is inserted into the inner core 14 and tightened with the tightening ring 18.

Therefore, according to the protection structure of the inner core 14 in the joint 10 of the present embodiment, the inner core 14 can be effectively protected until just before use, and the connection workability is excellent when the resin pipe 13 is connected. Demonstrate.
(2) The protective cap 20 is formed in a bottomed cylindrical shape, and an engagement protrusion 24 that engages with the flange 12 of the joint body 11 is provided on the inner peripheral surface of the opening. For this reason, the protective cap 20 can cover and protect the inner core 14 of the joint 10, and the engaging protrusion 24 can engage with the flange 12 of the joint body 11 to prevent the protective cap 20 from coming off.
(3) The cylindrical portion of the protective cap 20 is a tapered portion 26 whose diameter increases toward the opening side. Therefore, the tightening ring 18 can be easily fitted to the protective cap 20, and at the same time, the tightening ring 18 can be engaged with the protective cap 20 and held.
(4) The protective cap 20 is formed of a polyethylene resin which is a soft resin. Therefore, the protective cap 20 can be easily attached to the inner core 14 of the joint body 11 by utilizing the flexibility, and when the fastening ring 18 is attached to the protective cap 20, the protective cap 20 is bent and deformed to increase the attachment force. Can be improved.
(5) The mounting force of the protective cap 20 on the flange 12 of the joint body 11 is set to be larger than the mounting force of the fastening ring 18 on the protective cap 20. For this reason, it is possible to prevent the protective cap 20 from being detached from the inner core 14 when the fastening ring 18 is removed from the protective cap 20.
(6) A tightening portion 19 for tightening the resin pipe 13 is provided on the inner peripheral surface of the tightening ring 18, and when the tightening ring 18 is attached to the protective cap 20, the tightening portion 19 is protected by the protective cap 20. It is comprised so that it may engage and hold | maintain to the outer peripheral surface of this. Therefore, the tightening portion 19 of the tightening ring 18 can have both the function of tightening the resin pipe 13 and the function of engaging with the protective cap 20.

In addition, the said embodiment can also be changed and actualized as follows.
The mounting force of the tightening ring 18 on the protective cap 20 can be adjusted by changing the inclination angle β of the tapered portion 26 of the protective cap 20.

  An engagement recess for engaging the tightening portion 19 of the tightening ring 18 is provided on the outer peripheral surface of the tapered portion 26 of the protective cap 20 so as to increase the mounting force of the tightening ring 18 on the protective cap 20. Is also possible.

-The engagement protrusion 24 of the said protective cap 20 can also be provided in two places, three places, or five places or more. In any case, it is preferable to provide the engagement protrusions 24 at equal intervals.
-As the soft resin forming the protective cap 20, a vinyl acetate resin (PVAC), a polyurethane resin, or the like can be used.

The joint body 11 can be made of brass, the fastening ring 18 can be made of bronze, or the joint body 11 and the fastening ring 18 can be made of other metals.
-The external thread part 16 of the other end side of the said coupling main body 11 can also be changed into the connection part etc. of a one push type (one touch type).

  A plurality of fitting grooves 14a on the outer peripheral surface of the inner core 14 of the joint body 11 are formed to fit a plurality of seal rings 15, or the fitting grooves 14a are formed wide to form a wide sealing ring 15. Or can be configured to be fitted.

As the pipe, in addition to the resin pipe 13, a soft metal pipe such as a copper pipe can be used.
The joint 10 can be used for connecting a water heating system pipe, a hot water system pipe, a floor heating pipe, a road heating pipe, and the like.

  DESCRIPTION OF SYMBOLS 10 ... Joint, 11 ... Joint main body, 12 ... Flange, 13 ... Resin pipe, 14 ... Inner core, 18 ... Clamping ring, 19 ... Clamping part, 20 ... Protection cap, 24 ... Engagement protrusion, 26 ... Taper part .

Claims (5)

The joint body is a protection structure for the inner core in a joint that is configured to project an inner core that connects a pipe to the joint body, and with the pipe fitted to the inner core, the pipe is fastened to the inner core with a fastening ring. And
A protective cap for protecting the inner core is attached to the joint body when the joint is not used, and a fastening ring is attached to the protective cap, and the mounting force of the protective cap against the flange of the joint body Is set so as to be larger than the mounting force of the fastening ring to the protective cap, and the protective structure of the inner core in the joint. 2. The inner core of the joint according to claim 1, wherein the protective cap is formed in a bottomed cylindrical shape, and an engagement protrusion that engages with a flange of the joint body is provided on an inner peripheral surface of the opening. Protective structure. 3. The protection structure for an inner core in a joint according to claim 1, wherein the cylindrical portion of the protective cap is formed in a tapered shape whose diameter increases toward the opening side. 4. The said protective cap is formed with soft resin, The protection structure of the inner core in the coupling as described in any one of Claims 1-3 characterized by the above-mentioned . A tightening portion for tightening the pipe is provided on the inner peripheral surface of the tightening ring, and when the tightening ring is attached to the protective cap, the tightening portion is engaged and held on the outer peripheral surface of the protective cap. It is comprised as follows. The protection structure of the inner core in the coupling as described in any one of Claims 1-4 characterized by the above-mentioned.

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