JP4897965B2 - Joint and method for inserting and fixing a pipe to the joint - Google Patents

Description

The present invention relates to a joint attached to a header provided at a branch portion in a water / hot water supply system , and a connection fixing method of a connection pipe to the water / hot water supply system .

  In the hot water and hot water supply system, a header for water supply / hot water supply is provided at a branch portion, and the branch is branched from the header. A joint is attached to the header, and a resin pipe is connected to the header. There are an integrated type and a separated type of joint. When the integrated type is used, when the pipe is inserted into the joint, whether or not the pipe has been normally inserted is confirmed by visual observation and sound. Therefore, it is difficult to confirm that the pipe has been normally inserted into the joint. Furthermore, according to the integrated type, when the pipe is not inserted normally, if the pipe is inserted again normally, the inserted pipe is fixed by a retaining ring, a compression ring, etc., and there is no mechanism for releasing this fixing. .

  One example of a separation type joint conventionally used will be described. FIG. 7 is a side view with a partially cutaway portion for explaining a conventional joint.

  The joint 100 is connected to an adapter 101 whose tip 103 is connected to a header (not shown) and a resin pipe 110 so as to cover the central surface portion 107 from one end, and the other end (ie , Tip portion) 109 is formed of in-core 102 inserted into adapter 101. A grip ring 104 for fixing the inserted incore 102 is provided inside the portion of the adapter 101 where the tip 109 of the incore 102 is inserted.

  The surface portion 107 of the in-core 102 is inserted into the resin pipe as described above. At that time, one end of the in-core 102 is inserted into the pipe until the tip surface of the pipe is stopped by the vertical surface of the protrusion 108. In this state, the in-core 102 is inserted inside the adapter 101 so as to cover the surface portion from one end to the center, and the resin pipe is fixed in the adapter by the grip ring. Is done.

  The distal end portion 103 of the adapter 101 has a shape corresponding to the shape of the header, and the distal end portion of the adapter is inserted into the corresponding header and fixed in that state by, for example, a fastener. When an in-core with a part inserted in a resin pipe is inserted into the adapter, if the insertion is not sufficient, the grip ring is expanded using a special jig to release the fixing function for fixing the in-core. Then, the mounting of the resin pipe to the in-core and the insertion of the in-core into the adapter are performed again.

In the case of a conventional joint, a release mechanism is provided in the case where the fitting is not successfully performed, but the confirmation of the mounting state of the pipe 110 and the in-core 102 to the adapter 101 is visually confirmed. FIG. 8 shows the state of the joint. The state shown in FIG. 8B is a normal state. That is, one O-ring 106 can be confirmed through the resin pipe 110. On the other hand, the state shown in FIG. 8A is a state in which two O-rings 105 and 106 can be confirmed through the resin pipe 110, indicating that the insertion is insufficient. The state shown in FIG. 8C is a state in which the O-ring cannot be confirmed through the resin pipe 110, and the in-core function cannot be performed with the resin pipe 110 covering most of the in-core 102. Show.
JP 2004-183761 A

  As described above, in the integrated type, when the pipe is inserted into the joint, whether or not the pipe has been normally inserted is confirmed by visual observation and sound. Therefore, it is difficult to confirm that the pipe has been normally inserted into the joint. Furthermore, according to the integrated type, when the pipe is not inserted normally, if the pipe is inserted again normally, the inserted pipe is fixed by a retaining ring, a compression ring, etc., and there is no mechanism for releasing this fixing. .

  In the separation type, it is difficult to visually recognize when working in a dark place, and it is necessary to confirm by an expert, and it is difficult to confirm the insertion state easily and reliably.

  Therefore, the object of the present invention is to solve the conventional problems, insert a resin pipe with one touch, and easily and surely check the insertion, and easily release function even when the mounting condition is not good And a method of inserting and fixing a pipe to the joint.

  The present inventor has intensively studied to solve the conventional problems described above. As a result, the following was found. In other words, a resin pipe is inserted from one end of a fitting adapter having a retaining member that prevents the reverse movement to the other end, the flat surface of the other end, and the tip of the pipe If the pipe is fixed in a state where the surfaces are substantially on the same surface, it is possible to reliably visually confirm that the pipe has been inserted to a desired position. Next, the other end side (header side) of the joint adapter is fixed to the pipe fixed in such a manner that the flat surface of the other end of the joint adapter and the tip end surface of the pipe are substantially flush with each other. From the above, it was found that by inserting the in-core, a joint fitted with a pipe in a desired state can be reliably formed with one touch.

  Furthermore, as described above, when the flat surface of the other end of the joint adapter and the tip surface of the pipe are not substantially the same surface, or when the in-core is inserted in the same surface, a problem has occurred. In this case, it was found that the release function can be easily provided because the pipe can be released by further pushing it out to the in-core side.

A first aspect of the joint of the present invention is a joint for connecting a connection pipe for supplying hot water and hot water to a header of a branch portion of the hot water and hot water system,
Inside has a through hole, a main body portion having one end flat end surface, a nut which is connected to an opposite end of said flat end face of said body portion, said body portion by the nut A tooth portion that is disposed and fixed in the through-hole, and that prevents the connection pipe from being moved in the reverse direction while allowing the connection pipe to be inserted into the through-hole from the nut side. and stopper and a member having a joint adapter for fixing irreversibly inserting the connecting pipe from the nut side end portion into the through hole of the main body portion,
Has a through hole therein, a head which is inserted so as to be water stop in the header of the water supply hot water systems are inserted water stop capable to insert fixed to said connection pipe to the joint adapter A leg portion, the outer shape of the head portion is larger than the outer shape of the connection pipe, the outer shape of the leg portion is substantially the same as the inner diameter of the connection pipe, and the head portion and the leg portion are integrally formed. In-core,
With
The connection pipe is inserted into the through hole of the body portion of the joint adapter from the nut-side end portion to the flat end surface portion, and the flat surface of the flat end surface portion and the tip surface of the connection pipe are The connection pipe is fixed at a position substantially in the same plane, and the leg portion of the in-core is moved from the distal end portion of the connection pipe that is positioned and fixed to the joint adapter, and the leg portion of the head portion of the in-core. The end pipe on the side is inserted until it is in close contact with the flat surface of the body portion of the joint adapter, and the head of the in-core is further inserted into the header of the hot water supply system, thereby branching the connecting pipe. It is configured to connect to the header of the part .

According to a second aspect of the joint of the present invention, the connecting portion of the body portion to which the nut is connected includes a thread formed on the outer surface, and the nut corresponds to the thread on the inner surface. A screw groove is provided, and the nut is connected to the main body portion by meshing the screw thread and the screw groove, and the nut of the through hole of the main body portion is connected to the nut. A frustum-shaped retaining member accommodating portion for accommodating the member, and the inner diameter of the retaining member accommodating portion increases toward a boundary portion between the main body portion and the nut, and a substantially boundary between the main body portion and the nut. The retaining member is disposed in the portion .

According to a third aspect of the joint of the present invention, the in- core has at least one O-ring on the head, and the O-ring prevents water leakage when the head is inserted into the header. It has a water stop function and has at least one other O-ring in the leg, and prevents water leakage when the leg is inserted into the connection pipe connected to the connection adapter by the O-ring. It has a water stop function.

Furthermore, a fourth aspect of the joint of the present invention is characterized in that the joint adapter includes a fixing ring that presses and fixes the retaining member with the nut.

1st aspect of the connection fixation method of the connection pipe to the branch part to the water supply hot-water supply system of this invention is equipped with the head and the leg part, and the in-core which has a through-hole connected to the said head part from the said leg part The leg portion is inserted into a connection pipe inserted and fixed in a joint adapter, and the head portion of the in-core is inserted into a header of a branch portion of the water supply and hot water supply system, thereby providing a branch portion of the water and hot water supply system. A connection fixing method of a connection pipe for connecting the connection pipe,
The joint adapter has a flat end surface at one end, a main body having a through hole communicating from the flat end surface to the other end, and a nut connected to the other end of the main body And a tooth portion which is disposed in the through hole of the main body portion and is pressed and fixed by the nut, and the connection pipe can be inserted into the through hole from the nut side but is prevented from proceeding in the reverse direction. A retaining member having a connecting member, and the connecting pipe is irreversibly inserted from the end on the nut side to the flat end surface into the through-hole of the joint adapter, and the flat end surface Fixing the connection pipe at a position where the front end surfaces of the connection pipe are substantially flush with each other;
Then, from the tip of the connection pipe positioned and fixed so as to be substantially flush with the flat end surface of the joint adapter, the leg of the in-core is connected to the end of the in-core head on the leg side. Insert so that water can be stopped until the flat end face of the adapter for the joint comes into close contact,
Furthermore, the head of the in-core is inserted into the header of the hot water supply system.

According to a second aspect of the connection fixing method of the connection pipe to the branch part to the water / hot water supply system of the present invention, the connection pipe is connected to the end of the joint adapter from the nut side, and the tip surface of the connection pipe is connected to the main body side. When irreversibly inserted and fixed so as to be substantially flush with the end face part of the case, when the connecting pipe is inserted more than the same face as the end face part on the main body side, After the connection pipe is cut in the vicinity of the end on the nut side, the cut connection pipe is further pushed out and taken out from the flat end surface portion on the main body side, and the front end surface to which the subsequent connection pipe is connected is connected to the main body. It is arranged and fixed so as to be flush with the end face part on the side.

  According to the adapter for a joint of the present invention, it is provided with a retaining member having a tooth portion that prevents the reverse progression, and the resin pipe is inserted from the nut side in the vertical direction until the tip surface comes into contact with the flat plate. Then, the resin pipe is easily positioned and fixed to the joint adapter with one touch in a state where the front end surface and the flat end surface portion of the resin pipe are substantially flush with each other. Thus, it can be easily confirmed visually that the resin pipe is fixed at a desired position.

  According to the in-core of the present invention, the header used for the branch portion includes a head portion that is inserted so as to be able to stop water, and a leg portion that is inserted into the resin pipe inserted into the joint adapter so as to be able to stop water. Therefore, it can be attached to the adapter and the adapter for joints with one touch so that water can be stopped.

  According to the joint of the present invention, the resin pipe can be easily positioned and fixed to the joint adapter with one touch, and it can be easily confirmed visually that the resin pipe is fixed at a desired position. Can be attached to the resin pipe fixed to the joint adapter, and can be attached to the header provided at the branch portion with a water stop function with a single touch.

  According to the method of inserting and fixing the pipe to the joint of the present invention, the resin pipe is easily positioned and fixed to the joint adapter with a single touch, and it is easily confirmed visually that the resin pipe is fixed at a desired position. it can.

  Furthermore, according to the method for releasing a resin pipe from the joint adapter according to the present invention, the resin pipe can be easily released from the joint adapter simply by further pushing the resin pipe in the insertion direction.

  The aspect of the joint of the present invention and the method for inserting and fixing a pipe to the joint will be described in detail with reference to the drawings.

One aspect of the coupling adapter of the present invention includes a main body portion having a flat end surface portion, each having a through-hole portion corresponding to the center, a nut connected to the main body portion, the main body portion and the nut. An adapter for a joint provided with a retaining member having a tooth portion that is disposed between and prevents the progression in the reverse direction,
From the end on the nut side of the adapter formed by combining the main body, the retaining member and the nut, a resin pipe is irreversibly inserted, and with one touch, the end surface on the main body side It is an adapter for a joint in which the inserted pipe is fixed on the same end surface.

  FIG. 1 is a diagram illustrating a joint adapter. As shown in FIG. 1, the joint adapter is disposed between a main body portion having a flat end surface portion, a nut connected to the main body portion, and the main body portion and the nut so as to prevent progress in the reverse direction. A retaining member having a tooth portion and a fixing ring for fixing the retaining member are provided.

  Fig.1 (a) is the perspective view (left figure) and side view (right figure) of a nut. As shown in FIG. 1A, the nut 11 includes an end portion 12 on the side where a resin pipe is inserted, and a connection portion 13 corresponding to a connection portion of a main body portion described later, and accommodates a fixing ring therein. The fixing ring accommodating part 20 is provided. The end 12 on the side where the resin pipe is inserted is provided with a hole having a size substantially equal to the cross-sectional outer shape of the resin pipe. The connecting portion 13 of the nut 11 is formed by a thread groove formed along the inner surface.

  FIG. 1B is a perspective view (left view) and a side view (right view) of the fixing ring. As shown in FIG. 1B, the fixing ring 14 includes a rear end portion 15 that comes into contact with a retaining member described later, and a front end portion 16 that comes into contact with a fixing ring housing portion of the nut. Each has a shape combined with a retaining member and a fixing ring housing portion of the nut. For example, the rear end portion 15 includes a portion inserted into the retaining member and an end surface corresponding to the end surface of the retaining member. The front end portion has an inclined surface corresponding to the fixing ring housing portion of the nut.

  FIG. 1C is a perspective view (left view) and a side view (right view) of the retaining member. As shown in FIG. 1C, the retaining member 17 has a tooth portion 19 that prevents the inserted resin pipe from proceeding in the reverse direction. Preferably, the retaining member 17 includes a metal tooth portion 19 so that the inserted resin pipe does not return. The retaining member 17 is formed by processing a thin plate, and is accommodated in a retaining member accommodating portion of a main body portion to be described later, and is a hollow that protrudes in a tapered manner in the vertical surface 18 and the pipe traveling direction so as to be fixed. And a tooth portion 19 having a generally truncated cone shape.

  FIG.1 (d) is the perspective view (left figure) and side view (right figure) of a main-body part. As shown in FIG. 1 (d), the main body 31 includes a flat end surface portion 32 that is flush with the tip end surface of a pipe inserted as will be described later, and a nut connecting portion 33 at the end on the nut side. And a retaining member accommodating portion 34 for accommodating the retaining member described above. The connecting portion 33 includes a screw thread corresponding to a thread groove formed along the inner surface of the connecting portion 13 of the nut described above. The retaining member accommodating portion 34 has a function of preventing the resin pipe from proceeding in the reverse direction, and widens toward the nut side so that the tooth portion of the retaining member is accommodated. Furthermore, you may provide the recessed part 35 to which the fastener which fixes between a main body part and the header mentioned later is attached. The flat end surface portion 32 of the main body portion is provided with a hole portion having a size substantially the same as the cross-sectional shape of the resin pipe. In addition, a connection part is not limited to a screw thread and a screw groove, The member which can be connected closely can be used suitably.

  Further, the fixing ring 14 is not always necessary, and only the retaining member 17 may be used. Instead of the fixing ring, a ring-shaped member may be used to protect the retaining member.

  The nut, the fixing ring, the retaining member, and the main body shown in FIGS. 1A to 1D are assembled in the order shown in the drawings. In a state where there is no retaining member, the resin pipe can move forward and backward with a desired resistance through the assembled nut and hole of the main body. In the cross section along the long axis direction, the fixing ring accommodating portion and the retaining member accommodating portion are each formed of a substantially trapezoidal portion that is tapered from the boundary line.

Next, one aspect of the in-core of the present invention will be described. One aspect of the in-core of the present invention includes a head that is inserted into a header used for a branching portion so as to be able to stop water, and a leg portion that is inserted into a resin pipe inserted into a joint adapter so as to be able to stop water. The head and legs each have a through hole in the center,
This is an in-core in which the outer diameter of the head is larger than the outer diameter of the resin pipe, the outer diameter of the leg is substantially the same as the inner diameter of the resin pipe, and the head and the leg are integrally formed.

  FIG. 2 is a perspective view showing one aspect of the in-core. As shown in FIG. 2, the in-core 41 is inserted in a header used in a later-described branching section so as to be able to stop water, and inserted into a resin pipe inserted into the joint adapter so as to be able to stop water. Leg 43 to be provided. Each of the head portion 42 and the leg portion 43 has a through hole in the center. The outer diameter of the head 42 is larger than the outer diameter of the resin pipe, the outer diameter of the leg 43 is substantially the same as the inner diameter of the resin pipe, and the head 42 and the leg 43 are integrally formed. Further, at least one O-ring 44 is provided in the head portion 42 to provide a water stop function between the header and the above-described header 43, and at least one other O-ring 45 is provided in the leg portion 43, so that a resin pipe is provided. A water stop function is provided.

  FIG. 3 is a diagram for explaining a situation in which a resin pipe is inserted into the joint adapter and the flat end surface portion 32 of the main body portion 31 and the tip end portion of the resin pipe are fixed to be substantially flush with each other. In this state, the resin pipe is inserted into the assembled joint adapter, and the flat end surface portion of the main body portion is positioned substantially on the same surface as the front end surface of the resin pipe.

  That is, as described with reference to FIG. 1, the coupling adapter 2 assembled with the fixing ring and the retaining member disposed between the nut 11 and the main body 31 is connected to the flat end surface portion of the main body 31. Place the resin pipe 3 vertically on the flat plate so that the nut 32 is on the bottom and the nut is on the top. Insert the resin pipe 3 vertically from the nut side until the tip is in contact with the flat plate. The resin pipe 3 is easily positioned and fixed to the joint adapter 2 with one touch in a state where the tip end surface of the pipe 3 and the flat end surface portion 32 are substantially flush with each other. Thus, it can be easily confirmed visually that the resin pipe is fixed at a desired position.

  Since the resin pipe 3 is fixed so that it cannot be reversed by the retaining member as described above, the resin pipe 3 does not move to the nut 11 side. Depending on the shape of the fixing ring, retaining member, fixing ring accommodating portion, and retaining member accommodating portion, the fixed resin pipe may have some play so that it moves slightly in the major axis direction. good.

  Next, the joint of this invention is demonstrated. One aspect of the joint of the present invention includes a main body portion having a flat end surface portion, a nut connected to the main body portion, and a tooth portion that is disposed between the main body portion and the nut and prevents progress in the reverse direction. The resin pipe is irreversible from the nut side end formed by combining the main body, the retaining member, the fixing ring and the nut. The joint end adapter and the end face of the main body and the end face of the pipe are fixed on the same plane, the head used for the branching section, and the head inserted so as to be able to stop water, and the joint A resin pipe that is inserted into the adapter and fixed on the same surface is provided with a leg portion that is inserted so as to be able to stop water, and the outer diameter of the head is larger than the outer diameter of the resin pipe, and the outer diameter of the leg portion Is almost the same as the inner diameter of the resin pipe, and the head and legs are A joint and a incore which is bodily formed.

  FIG. 4 is a diagram illustrating the joint. That is, the in-core is inserted into a resin pipe fixed to the joint adapter while being prevented from proceeding in the reverse direction. As shown in FIG. 4, the resin pipe 3 is easily positioned and fixed to the joint adapter 2 with one touch as described with reference to FIG. The leg part 43 is inserted. Since the resin pipe 3 positioned and fixed to the joint adapter 2 does not move to the nut 11 side, even if the leg portion 43 of the in-core 41 is inserted into the resin pipe 3, the joint adapter 2 shown in FIG. The mutual relationship between the pipes 3 does not collapse. Accordingly, the end surface of the head portion 42 of the in-core 41 on the leg portion 43 side is fixed in close contact with the flat end surface portion 32 of the main body portion 31. In this state, since the O-ring 45 attached to the surface of the leg portion 43 of the in-core 41 performs a water-stop function between the inner surface of the resin pipe 3, the water passing through the pipe 3 is in contact with the in-core 41. There is no leakage from the connection.

  As will be described later, an O-ring 44 provided on the head portion 42 of the in-core 41 similarly performs a water stop function with the header.

  FIG. 5 is a diagram for explaining a situation in which the joint of the present invention, in which the resin pipe is fixed at a desired position, described with reference to FIG. 4 is connected to the header. As shown in FIG. 5, the joint 1 of the present invention in which the resin pipe is fixed at a desired position described with reference to FIG. 4 is attached to the header 50 provided at the branch portion. The head portion 42 of the in-core 41 of the joint 1 is inserted into the header 50, and the O-ring 44 provided on the head portion 42 of the in-core 41 performs a water stop function between the header 50.

  Therefore, by adapting the shape of the in-core head to the shape of the corresponding header, it can be easily attached with one touch without impairing the function of the present invention.

  FIG. 6 is a diagram for explaining the release state. In the joint 2 of the present invention, the resin pipe 3 is inserted from the nut 11 side, and the end surface of the resin pipe 3 is substantially flush with the flat end surface portion 32 of the main body portion 31. When the distal end surface of the resin pipe 3 protrudes from the flat end surface portion 32 of the main body 31 due to an operation error or the like when the portion 43 is inserted, the resin pipe 3 is cut at a desired location, With the leg 43 of the in-core 41 inserted, the release function works by pulling out the resin pipe 3 in the direction of the arrow. Thereafter, the same operation as described above for inserting the resin pipe 3 into the joint adapter 2 may be repeated.

  Next, a method for inserting and fixing a pipe to the joint of the present invention will be described. As described with reference to FIGS. 2 to 4, one aspect of the method for inserting and fixing a pipe to the joint of the present invention includes a main body portion having a flat end surface portion, a nut connected to the main body portion, From a nut-side end portion of a fitting adapter provided with a retaining member that is disposed between the main body portion and the nut and has a tooth portion that prevents progression in the reverse direction, and a fixing ring that fixes the retaining member. The resin pipe is irreversibly inserted so that the end surface thereof is substantially flush with the end surface portion on the main body side, and a head inserted into the header used for the branch portion so as to be able to stop water, and a joint The in-core, which is integrally provided with the resin pipe inserted into the adapter for the water and the leg portion inserted so as to be able to stop water, is connected to the leg from the end surface portion of the pipe fixed substantially on the same surface as the end surface portion on the main body side. Insert into the pipe, so that the whole part is located in the pipe Is the insertion method of fixing the type.

  That is, as described with reference to FIGS. 2 to 4, the pipe can be inserted and fixed to the joint with one touch. In other words, the tooth part of the retaining member protrudes to the flat end face side of the adapter, preventing the resin pipe from moving in the direction opposite to the insertion direction, and inserting it so that it is almost flush with the end part on the main body side. Then, the tip end surface of the fixed resin pipe can be visually recognized. After confirming this state, the in-core leg is inserted from the tip of the resin pipe.

  As described above, according to the present invention, a joint and a joint that can be easily and surely confirmed visually by inserting a resin pipe with a single touch, and have a release function even when the mounting state is not good. It is possible to provide a method for fixing the pipe to the pipe.

FIG. 1 is a diagram illustrating a joint adapter. Fig.1 (a) is the perspective view (left figure) and side view (right figure) of a nut. FIG. 1B is a perspective view (left view) and a side view (right view) of the fixing ring. FIG. 1C is a perspective view (left view) and a side view (right view) of the retaining member. FIG.1 (d) is the perspective view (left figure) and side view (right figure) of a main-body part. FIG. 2 is a perspective view showing one aspect of the in-core. FIG. 3 is a diagram for explaining a situation in which a resin pipe is inserted into the joint adapter and the flat end surface portion 32 of the main body portion 31 and the tip end portion of the resin pipe are fixed to be substantially flush with each other. FIG. 4 is a diagram illustrating the joint. FIG. 5 is a diagram for explaining a situation in which the joint of the present invention, in which the resin pipe is fixed at a desired position, described with reference to FIG. 4 is connected to the header. FIG. 6 is a diagram for explaining the release state. FIG. 7 is a side view with a partially cutaway portion for explaining a conventional joint. FIG. 8 is a side view showing a state of the joint.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Joint 2 Joint adapter 3 Resin pipe 11 Nut 12 End part 13 in which resin pipe is inserted 13 Connection part 14 Fixing ring 15 Rear end part 16 Front end part 17 Stopping member 18 Vertical surface 19 Teeth part 31 Body part 32 Flat end surface portion 33 Connection portion 34 Retaining member accommodating portion 35 Recess 41 In core 42 Head portion 43 Leg portion 44, 45 O-ring 44
50 header

Claims (6)

A joint for connecting a connection pipe for hot and cold water supply to the header of the branch part of the hot water and hot water system,
Inside has a through hole, a main body portion having one end flat end surface, a nut which is connected to an opposite end of said flat end face of said body portion, said body portion by the nut A tooth portion that is disposed and fixed in the through-hole, and that prevents the connection pipe from being moved in the reverse direction while allowing the connection pipe to be inserted into the through-hole from the nut side. and stopper and a member having a joint adapter for fixing irreversibly inserting the connecting pipe from the nut side end portion into the through hole of the main body portion,
Has a through hole therein, a head which is inserted so as to be water stop in the header of the water supply hot water systems are inserted water stop capable to insert fixed to said connection pipe to the joint adapter A leg portion, the outer shape of the head portion is larger than the outer shape of the connection pipe, the outer shape of the leg portion is substantially the same as the inner diameter of the connection pipe, and the head portion and the leg portion are integrally formed. In-core,
With
The connection pipe is inserted into the through hole of the body portion of the joint adapter from the nut-side end portion to the flat end surface portion, and the flat surface of the flat end surface portion and the tip surface of the connection pipe are The connection pipe is fixed at a position substantially in the same plane, and the leg portion of the in-core is moved from the distal end portion of the connection pipe that is positioned and fixed to the joint adapter, and the leg portion of the head portion of the in-core. The end pipe on the side is inserted until it is in close contact with the flat surface of the body portion of the joint adapter, and the head of the in-core is further inserted into the header of the hot water supply system, thereby branching the connecting pipe. A joint that is configured to be connected to the header of a portion . The connecting portion of the main body to which the nut is connected includes a thread formed on the outer surface, the nut includes a thread groove corresponding to the thread on the inner surface, and the nut The screw thread and the screw groove are meshed and connected to the main body,
The main body portion has a truncated cone-shaped retaining member accommodating portion that accommodates the retaining member on the side of the through hole where the nut is connected, and the retaining member accommodating portion includes the main body portion and the nut. 2. The joint according to claim 1 , wherein an inner diameter increases toward a boundary portion of the main body portion and the retaining member is disposed substantially at a boundary portion between the main body portion and the nut . The in-core has at least one O-ring on the head, and has a water-stop function for preventing water leakage when the head is inserted into the header by the O-ring, It has one another O-ring, and has a water stop function to prevent water leakage when the leg is inserted into the connection pipe connected to the connection adapter by the O-ring. The joint according to 1 or 2. The joint according to any one of claims 1 to 3, wherein the joint adapter includes a fixing ring that presses and fixes the retaining member with the nut . The in-core leg portion having a head and a leg portion and having a through-hole communicating from the leg portion to the head portion is inserted into a connection pipe inserted and fixed in a joint adapter, and the in-core portion By connecting the connection pipe to the branch part of the water / hot water supply system by inserting the head into the header of the branch part of the water / hot water system,
The joint adapter has a flat end surface at one end, a main body having a through hole communicating from the flat end surface to the other end, and a nut connected to the other end of the main body And a tooth portion which is disposed in the through hole of the main body portion and is pressed and fixed by the nut, and the connection pipe can be inserted into the through hole from the nut side but is prevented from proceeding in the reverse direction. A retaining member having a connecting member, and the connecting pipe is irreversibly inserted from the end on the nut side to the flat end surface into the through-hole of the joint adapter, and the flat end surface Fixing the connection pipe at a position where the front end surfaces of the connection pipe are substantially flush with each other;
Thereafter, from the tip of the connection pipe inserted into the joint adapter and positioned and fixed to the flat end surface, the leg of the in-core is connected to the end of the in-core head on the leg side and the joint adapter. Insert so that water can be stopped until the flat end face part comes into close contact,
Furthermore, the head of the said in-core is inserted in the said header of the said hot-water supply hot-water supply system, The connection fixing method of the connection pipe to the hot-water supply hot-water supply system characterized by the above-mentioned . From the end on the nut side of the joint adapter, when the connection pipe is irreversibly inserted and fixed so that the end surface thereof is substantially flush with the end surface portion on the main body side, If the connection pipe is inserted more than the same surface as the end face portion on the main body side, after cutting the connection pipe in the vicinity of the end portion on the nut side, further push forward the cut connection pipe 6. The apparatus according to claim 5, wherein the main body side is taken out from the flat end surface portion, and a distal end surface to which a subsequent connection pipe is connected is arranged and fixed so as to be flush with the end surface portion on the main body side. To fix the connection pipe to the branch of the hot and cold water supply system.

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