JP5015282B2 - Pipe fitting - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pipe joint capable of connecting pipes by a single operation to allow a worker to confirm a connection state of pipes visually from the outside as well as prevent the occurrence of leakage through the pipe joint without fail and preventing the occurrence of erroneous connection of pipes and erroneous fitting of a core ring, etc. securely. <P>SOLUTION: This pipe joint is constituted by covering the outer periphery of a resin-made transparent cylinder engaging its one end with a cylindrical joint member with a cylindrical lid member, screw-fitting and connecting a tip side of the lid member into/with the joint member, and forming an abutting face where a tip of an insertion pipe is abutted on an inner peripheral side of the transparent cylinder to enable the abutting face to be confirmed through the transparent cylinder by a check window formed on an outer peripheral face of the lid member. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a pipe joint for connecting a resin pipe used for water supply, hot water supply, an air conditioning system, a fire extinguishing facility, or the like with one touch.

  This type of pipe, especially resin pipes, is widely used for water supply, hot water supply or cooling / heating piping in buildings, floor heating of detached houses, etc. The pipe joint for connecting this resin pipe is connected to the pipe. It is a necessary condition that the connection work is simple and reliable, and there is no fear of water leakage.

  In general, when a resin pipe with a core ring fitted at the tip is inserted into the joint, the claw of the retaining member in the joint bites into the pipe and the retaining is restricted. A structure in which the outer peripheral surface is sealed with a seal ring is known (see Patent Document 1, Patent Document 2, etc.).

  However, in this pipe joint, when the pipe is inserted, the contractor may check whether a predetermined amount of the resin pipe length is inserted in the joint or whether the coring is inserted. Even after construction, since a person other than the construction contractor cannot make the same confirmation, the resin pipe may come off or leak if the connection between the resin pipe and the pipe joint is incomplete. It was.

  Therefore, Patent Document 3, Patent Document 4, and the like have been proposed as measures for confirmation. The former is a method in which a sealing material is attached to the outer peripheral surface of the pipe to be inserted and the length of the pipe insertion part is used as a guide, and the latter is a method of inserting the pipe into the pipe joint in the length direction of the pipe. This is a method in which a circumferential line displaying the quantity is provided and this circumferential line is inserted into the joint as a guide.

Japanese Patent Laid-Open No. 11-280981 Japanese Patent No. 2685105 Japanese Patent No. 2975019 JP 2000-88514 A JP 2000-266252 A

  These methods are based on the premise that the contractor, etc., must follow the installation procedure. If there is an error in the installation procedure, the connection will still be incomplete, and after the installation, It is impossible for a person to confirm this mistake, and this method is extremely unreliable, resulting in a problematic method.

  On the other hand, Patent Document 5 has been proposed as a means for confirming the connection, but since this method is an inner diameter seal method for sealing the inner periphery of the pipe, it is easy to provide a confirmation hole or the like. Since it is difficult to increase the volume of the seal ring, it is difficult to increase the volume of the seal ring, and the life of the seal ring is shortened. Also, pipes are usually manufactured based on the outer diameter. Due to the lack of stability in the dimensions of the inner diameter and the surface state, the structure that seals only with the elasticity of rubber has a problem that the sealing performance becomes unstable instead.

  The present invention has been developed in view of the conventional problems. The object of the present invention is to connect the pipes and the inside of the joints in addition to being able to connect with one touch and surely prevent leakage. It is an object of the present invention to provide a pipe joint that can be visually observed from the other side and prevents a pipe connection or an internal component from being attached incorrectly.

In order to achieve the above-mentioned object, the invention according to claim 1 is characterized in that an engagement surface is formed on the inner step surface of the inner peripheral surface at one end of the cylindrical joint member, and is cylindrical and transparent or translucent. Forming an engaging portion at an end portion of the resin-made fluoroscopic cylinder, and engaging the engaging portion of the fluoroscopic cylinder inserted into the inner periphery of the joint member with the engaging surface of the joint member; A tubular body covering the outer periphery of the fluoroscopic cylinder, and a joint body is formed by screwing and engaging the front end side of the lid member having a pipe insertion port at the rear end to one end side of the joint member, and in the lid member Is provided with a retaining member that bites into the outer peripheral surface of the pipe and prevents the pipe from being detached, and is formed with an opening on the outer peripheral surface of the lid member, and is inserted into the inner peripheral side of the fluoroscopic cylinder. forming an abutment surface which the tip of the pipe abuts, visibly set from the outside before Ki挿 entrance pipe through the transparent tube from the confirmation window It is a tube joint.

Invention, the engaging surface is formed on one end side inner peripheral surface inner stepped face of the tubular joint member, an end of at cylindrical and transparent or semi-transparent resin-made transparent tube according to claim 2 An engaging portion is formed in the portion, and the engaging portion of the fluoroscopic cylinder inserted into and engaged with the inner periphery of the joint member is engaged with the engaging surface of the joint member to cover the outer periphery of the fluoroscopic cylinder A tubular body is formed by screwing and engaging the front end side of a lid member having a pipe insertion port at the rear end to one end side of the joint member to form a joint body, and the pipe member bites into the outer peripheral surface of the pipe. A retaining member for restricting the retaining of the pipe is provided, a confirmation window is formed on the outer peripheral surface of the joint member, and the tip of the insertion pipe is in contact with the inner peripheral side of the fluoroscopic cylinder forming a surface, provided with insertion pipes in contact with the contact surface through the transparent tube from the viewing window than visible externally It is a joint.

The invention according to claim 3 is a pipe joint in which the contact surface is formed to project in the centripetal direction on the inner peripheral surface at one end of the see-through cylinder.

  In this case, a tubular joint member and a tubular lid member are screwed together to form a joint body, and the see-through tube is hermetically sealed with a seal ring between the inner periphery of the joint member and the outer peripheral surface of the inserted resin pipe. A pipe joint in which the resin pipe is prevented from being retained by a retaining member mounted inside the lid member is preferable.

  Moreover, it is preferable that a cover member comprises the coupling main body by screwing together the cap which has a female thread, or the bush which has a male thread, and the coupling member which has a thread part corresponding to this. Further, the confirmation window is formed on either the joint member or the lid member, and the see-through cylinder is formed of a resin material having pressure resistance strength, cold resistance, and hydrolysis resistance higher than that of the resin pipe. A pipe joint whose outer peripheral surface is hermetically covered with a joint member and a lid member is preferable.

  As is apparent from the above, according to the present invention, the resin pipe can be connected with a single touch, and there is no fear of water leakage.

  In addition, since it is possible to visually confirm that a predetermined amount of pipe has been inserted from the confirmation window through the fluoroscopic cylinder, it is possible for the contractor to check whether there is a lack of insertion during construction, and after construction, the other person should also confirm. Therefore, it is possible to prevent the pipe from coming off or leaking due to a construction error.

  Also, through the fluoroscopic cylinder inside the confirmation window, you can see that the core ring has been fitted into the pipe without forgetting it, and you can see the internal parts such as the seal ring and retaining member, so as before Accidents such as leakage can be prevented.

  Furthermore, the fluoroscopy tube is a material that has sufficient pressure resistance, heat resistance, and hydrolysis resistance to be used for water supply and hot water supply piping, etc., and is covered and protected by the joint body, so it can be used for a long time. Can withstand.

It is the perspective view which showed an example of the pipe joint in this invention. It is the front view shown with the partial cross section of FIG. It is a partially notched sectional view showing another example of the pipe joint of the present invention. It is a partially notched sectional view showing still another example of the pipe joint of the present invention. It is a partially notched sectional view showing still another example of the pipe joint of the present invention. It is a partially notched sectional view showing still another example of the pipe joint of the present invention. It is a partially notched sectional view showing still another example of the pipe joint of the present invention.

  An embodiment when a resin pipe is connected to a pipe joint in the present invention will be described in detail with reference to the drawings.

  1 and 2 show an example of a pipe joint according to the present invention, in which 1 is a metal joint body such as brass or bronze, and the joint body 1 in this example is a tubular joint. The male screw 2a of the member 2 and the female screw 3a of the cylindrical lid member (cap) 3 are screwed together, and at the end of the joint member 2, a male screw connected to a header or connecting member (not shown). The part 2b (or female thread part) is provided.

  In this example, two confirmation windows 4 are formed in a substantially rectangular shape on the outer peripheral surface of the lid member 3 over approximately 90 ° or more, and an engagement surface 5 is formed on the inner step surface of the joint member 2. On the other hand, a mounting surface 7 is formed at the end of the lid member 3 at the pipe insertion port 6 and the inner periphery of the lid member 3.

  In the figure, 8 is a transparent or translucent transparent cylinder having pressure strength, cold resistance, hydrolysis resistance, and chlorine resistance. This transparent cylinder 8 is made of amorphous material such as polysulfone or polyethersulfone. A resin is preferable, but a material such as glass may be used. The see-through cylinder 8 in FIG. 2 has an engagement portion 8a that engages with the engagement surface 5 of the joint member 2, a pipe contact surface 9 formed on the inner peripheral surface, and a seal ring 10 mounted on the rear end. The mounting portion 8b is formed with a mounting step portion 8c for mounting the seal ring 11 at the tip, so that the seal rings 10 and 11 having the same diameter can be used. The pressure resistance of the see-through cylinder 8 is at least greater than that of the resin pipe 13 described later.

  The see-through cylinder 8 is disposed between the outer peripheral surface of the pipe 13 and the inner peripheral surface of the joint main body 1, but the end of the female thread 3 a of the lid member 3 constituting the joint main body 1, Since the lid member 3 is brought into contact with the base portion 2c of the screw portion 2a so that the lid member 3 cannot be screwed more than necessary, the see-through cylinder 8 has a structure that is not directly affected by the tightening force of the lid member 3. . In addition, the outer periphery of the see-through cylinder 8 is covered with the lid member 3 except for the position facing the confirmation window 4, and has a structure that can withstand fluid pressure even by a double structure with the lid member 3.

  In FIG. 2, reference numeral 12 denotes a retaining member having a regulation claw 12 a projecting from the inner periphery, and the regulation claw 12 a of the retaining member 12 bites into the outer peripheral surface of the pipe 13 to regulate the retaining of the pipe. I have to. A spacer 15 is provided between the retaining member 12 and the see-through cylinder 8 for disposing the seal ring 10 and the retaining member 12 at predetermined positions. In the state where the screwing of the lid member 3 to the joint body 1 is completed, that is, in the state where the end portion of the female screw 3a of the lid member 3 and the base portion 2c of the male thread portion 2b of the joint body 1 are in contact with each other. A space in which the retaining member 12 can rotate is secured between the mounting surface 7 and the spacer 15.

  The pipe 13 is a pipe formed of a resin material such as cross-linked polyethylene or polybutene. When the pipe 13 is connected to a pipe joint, a metal core ring 14 such as bronze is fitted into the insertion portion of the pipe 13. It wears and the amount of biting of the retaining member 12 and the sealing performance of the seal ring are maintained. A flange 14 a is formed at the tip of the core ring 14 to protect the end of the pipe 13 and to smoothly insert the pipe 13 into the joint body 1. The pipe 13 may be made of copper in addition to resin.

  Next, the operation in the above embodiment will be described. 1 and 2, in order to incorporate the joint body 1, the seal ring 11 is attached to the corner portion of the engagement surface 5 of the joint member 2, and then the fluoroscopic cylinder 8 is inserted into the joint member 2. The engaging portion 8a of the tube 8 is engaged with the engaging surface 5 of the joint member 2, and the seal ring 11 is mounted on the mounting step 8c so that the see-through tube 8 and the joint member 2 in the liquid contact portion are hermetically sealed. Is done. Further, the seal ring 10 is mounted on the mounting portion 8 b formed at the rear end portion of the see-through cylinder 8.

  Next, when the female screw 3a of the lid member 3 fitted with the retaining member 12 and the spacer 15 is screwed into the male screw 2a of the joint member 2, the joint body 1 shown in FIGS. When the resin pipe 13 is connected to the joint body 1, the core ring 14 is fitted from the tip of the pipe 13, and the flange portion 14 a of the core ring 14 is fitted to the end face of the pipe 13. The resin pipe 13 is inserted from the pipe insertion port 6 of the lid member 3 and inserted until the flange portion 14 a of the core ring 14 contacts the contact surface 9 of the see-through cylinder 8. Then, the retaining member 12 bites into the outer peripheral surface of the pipe 13 and is prevented from coming off, and the outer peripheral surface of the pipe 13 and the inner peripheral surface of the see-through cylinder 8 are securely sealed and sealed by the seal ring 10.

  Further, in FIG. 2, the resin pipe 13 inserted into the joint body 1 is visually observed from the outside through a transparent or translucent transparent cylinder 8 from the confirmation window 4 formed on the outer peripheral surface of the lid member 3 of the joint body 1. can do. In this case, the core ring 14 fitted to the resin pipe 13 can also be visually observed, and the internal parts such as the seal rings 10 and 11 and the retaining member 12 mounted inside can be visually observed from the outside. Insertion insufficiency that does not reach a fixed amount and mounting errors of parts and the like can be confirmed, and it is possible to solve the conventional problems.

  After the confirmation of the mounting of the resin pipe 13 to the joint body 1 by the confirmation window 4, when a fluid such as cold water or hot water is passed through the pipe 13, the fluid is separated from the transparent cylinder 8, the gap between the pipe 13 and the transparent cylinder 8 Although they enter the gaps of the joint member 2, both are sealed by the seal rings 10 and 11, so that no fluid leaks from the confirmation window 4 provided in the lid member 3 to the outside of the pipe joint. Accordingly, although the fluid pressure is directly applied to the see-through cylinder 8, the see-through cylinder 8 is made of a material having a pressure strength exceeding the fluid pressure, and the outer periphery thereof is tightly covered with the lid member 3, so that it is not damaged. Can withstand fluid pressure. Furthermore, since the see-through cylinder 8 has a higher pressure resistance than the resin pipe 13, even if the pipe 13 is damaged by fluid pressure, the see-through cylinder 8 is not damaged. Therefore, the pipe joint of the present invention can confirm the construction of the pipe 13 from the outside of the joint while maintaining the strength that the joint should have.

  FIG. 3 shows another example of the pipe joint according to the present invention. In this example, the joint body 1 includes a female thread 16a of a joint member 16 having a threaded portion 16b and a male thread 17a of a lid member (bush) 17. This is an example configured by screwing, and the other components are the same as in the example of FIG.

  4 to 8 show application examples of the pipe joint shown in FIGS. 2 and 3. In particular, FIGS. 4 to 6 show the example of FIG. 2, but the pipe joint of FIG. Cases are also included. FIG. 4 is an example in which the joint member 2 and the see-through cylinder 8 are integrally formed. In this case, the seal ring 11 for hermetically sealing the both can be omitted. The other components are the same as those in the above example.

  FIG. 5 is an example in which a confirmation window 18 is provided in the joint member 2, and the seal ring 10 seals the cap 3, the pipe 13, and the see-through cylinder 8. In this case, since the confirmation window 18 is provided in the joint member 2, in particular, the collar portion 14 a of the core ring 14 fitted to the pipe 13 is surely visually recognized from the outside, and the forgetting to attach the core ring 14 is obviated. Can be prevented.

  FIG. 6 is an example in which the flange portion 14a of the core ring 14 fitted to the pipe 13 is brought into contact with the abutting surface 2d of the joint member 2. In this case, the fluoroscopic cylinder 8 influences the influence of the contact force of the pipe 13. Has the effect of not receiving directly. Other members are the same as those in FIG.

  FIG. 7 shows an example in which a spacer functional part is integrally formed at the end of the see-through cylinder 8 and the spacer part 15 is omitted, and the other part has the same part configuration as that of FIG. In addition, the pipe joint described in the present embodiment can be removed even when a rotational force is applied to the pipe 13 connected to the joint body 1 due to twisting of the pipe 13 at the time of piping construction or generation of a water hammer at the time of fluid loading. Since the stopper member 12 is rotatably arranged on the joint body 1, the pipe 13 and the retaining member integrated with the pipe 13 rotate, so that the joint body 1 is not twisted and damaged.

1 Joint body 2 Joint member 2a Male thread 3 Lid member (cap)
3a Female screw 4 Confirmation window 6 Pipe insertion port 8 Perspective tube
9 Pipe contact surfaces 10 and 11 Seal ring 12 Retaining member 13 Resin pipe 14 Core ring 14a ridge part 16 Joint member 17 Lid member (bush)
18 Confirmation window

Claims (3)

An engagement surface is formed on the inner step surface of the inner peripheral surface at one end of the cylindrical joint member, and an engagement portion is formed at the end of the cylindrical and transparent or translucent resin fluoroscopic cylinder. The coupling portion of the fluoroscopic cylinder, which is inserted and engaged with the inner periphery of the joint member, is engaged with the engagement surface of the joint member, and is a cylindrical shape covering the outer periphery of the fluoroscopic cylinder. A stopper main body is formed by screwing and engaging the distal end side of the lid member having an insertion opening to one end side of the joint member, and the pipe member is inserted into the outer peripheral surface of the pipe member so as to prevent the pipe from coming off. And a confirmation window is formed on the outer peripheral surface of the lid member, and an abutment surface is formed on the inner peripheral side of the see-through cylinder so that the distal end of the insertion pipe abuts. pipe joint, wherein more said that the Ki挿 incoming pipe via the front perspective cylinder provided externally from visibly. An engagement surface is formed on the inner step surface of the inner peripheral surface at one end of the cylindrical joint member , and an engagement portion is formed at the end of the cylindrical and transparent or translucent resin fluoroscopic cylinder. The coupling portion of the fluoroscopic cylinder, which is inserted and engaged with the inner periphery of the joint member, is engaged with the engagement surface of the joint member, and is a cylindrical shape covering the outer periphery of the fluoroscopic cylinder. A stopper main body is formed by screwing and engaging the distal end side of the lid member having an insertion opening to one end side of the joint member, and the pipe member is inserted into the outer peripheral surface of the pipe member so as to prevent the pipe from coming off. And a confirmation window is formed on the outer peripheral surface of the joint member, and a contact surface on which the tip of the insertion pipe contacts is formed on the inner peripheral side of the see-through cylinder. pipe joint, wherein more said that the via fluoroscopic tube contact surface of the inserted pipe abutting provided externally from visibly   3. The pipe joint according to claim 1, wherein the contact surface is formed to project in a centripetal direction on an inner peripheral surface on one end side of the see-through cylinder.

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