JP2008281190A - Connection structure of header and pipe coupling - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily connect a resin header and a pipe coupling by the fastener connection of using a resin connecting member. <P>SOLUTION: The synthetic resin header 10 and the pipe coupling 20 with flanges 16 and 23 butted on each other are connected by the synthetic resin connecting member 30. The connecting member 30 has an opening on the tip, and is formed in a substantially U shape with an opening end part of a branch connecting part 12 in the innermost part and a storage part capable of storing an intermediate part of the pipe coupling 20. The storage part is formed with a substantially semicircular cylindrical surface having an outer diameter of an annular groove 14 of the branch connecting part 12 and an inner diameter corresponding to an outer diameter of an annular groove 24 of the pipe coupling 20, and an inner peripheral surface composed of a pair of planes respectively continuing with the cylindrical surface. The inner peripheral surface is also formed with a guide groove having a width corresponding to the thickness of the flange 16 of the butted branch connecting part 12 and the flange 23 of the pipe coupling 20 and an inner diameter corresponding to an outer diameter of these flanges, over the whole periphery. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a connection structure between a header and a pipe joint.

  Conventionally, as a hot water supply and hot water supply piping system for houses, a water supply main pipe and a hot water supply main pipe are connected to a water supply header and a hot water supply header, respectively. A header construction method is employed in which the parts are connected one-to-one.

  Specifically, in the piping system based on the header construction method, the main pipe led to the under-floor space of the house is connected to the header main body of the header, while the branch pipes are connected to the respective branch connection parts of the header. Is circulated in the space under the floor and connected to the connection part of each equipment.

  In such a piping system using the header construction method, when connecting the main pipe and the branch pipe to the header main body and the branch connection part of the header, respectively, connect the main pipe and the branch pipe to the pipe joint, and connect the pipe joint to the header main body part and the branch pipe. A method of screwing and connecting to the connecting portion is adopted from the viewpoint of exchangeability of the branch pipe and the like.

On the other hand, in recent years, a synthetic resin header has been used, and if it is screwed to the synthetic resin header, a large force acts on the threaded portion, which is disadvantageous in terms of strength. For this reason, when using a header made of a synthetic resin, as shown in Patent Document 1, the header main body portion, the pipe joint, the branch connection portion, and the pipe joint, which have the flanges butted together, are connected using an elastic connection fitting. A method called fastener connection is adopted.
JP 2005-188682 A

  By the way, it is common to use the spring material which consists of a stainless steel plate as the elastic connection metal fitting mentioned above. However, when the header main body of the header and the pipe joint and the branch joint and the pipe joint are connected using such an elastic connection fitting, for example, when a water hammer phenomenon occurs when the water tap is suddenly closed, the header At the connection between the pipe joint and the pipe joint, a pulling force that tries to separate from each other acts. Thereby, there exists a possibility that the flange of the resin header in which intensity | strength is insufficient compared with a metal pipe joint may be damaged.

  For this reason, in Patent Document 1, the reinforcing ring is attached to the annular groove forming the flange. However, when the thickness of the reinforcing ring is small, it is easy to attach to the annular groove, but it is deformed at the time of attachment. Or the reinforcing effect is small, and the effect of dispersing the pulling force acting on the flange is small. In particular, there is no problem when it is molded from plastics with relatively high strength at high temperatures, such as engineering plastics, but when headers are molded from general-purpose resins such as olefins and vinyl chloride, It cannot be applied to.

  On the other hand, when the thickness of the reinforcing ring is large, there is a drawback that it cannot be easily deformed and is not easily mounted. In addition, when the thickness of the reinforcing ring is large, deformation of the connecting portion between the header and the pipe joint hardly occurs, but since the outer diameter is defined by the elastic connecting fitting, the thickness of the resin of the flange is accordingly increased. It becomes thin and causes a decrease in strength.

  The present invention has been made in view of such a problem, and can easily connect a resin header and a pipe joint by a fastener connection using a resin connection member, and pull out force at a connection portion. The present invention provides a connection structure between a header and a pipe joint that can reliably maintain a connected state even if the action is applied.

  The present invention protrudes from the outer peripheral surface of the header main body portion in which the annular groove and the flange by the annular groove are formed at the opening end portion, and the annular groove and the flange by the annular groove are formed at the opening end portion. A synthetic resin header comprising a branch connection portion, an insertion port portion that can be inserted into the branch connection portion of the header at one end portion, and a tube mounting portion that can connect a branch pipe to the other end portion, and an intermediate portion A flange that can be abutted with the flange of the branch connection portion, a pipe joint that is formed on the back side of the flange and has an annular groove, and a connecting member that connects the branch connection portion and the pipe joint with which the flanges are abutted with each other The connecting member has an opening corresponding to the outer diameter of the annular groove of the branch connection portion and the outer diameter of the annular groove of the pipe joint at the tip, and the opening of the branch connection portion at the inner back. It has an accommodating part that can accommodate the end part and the intermediate part of the pipe joint, and is formed in a substantially U shape. The accommodating part has an outer diameter of the annular groove of the branch connection part and an outer diameter of the annular groove of the pipe joint. A substantially semicircular cylindrical surface having a corresponding inner diameter and an inner peripheral surface made up of a pair of planes continuous to the cylindrical surface are formed. A guide groove having a width corresponding to the thickness of the flanges of the joint and an inner diameter corresponding to the outer diameter of those flanges is formed over the entire circumference, and an insertion port is inserted into the branch connection portion of the header, and the flanges are abutted against each other. In this case, the receiving portion of the connecting member is fitted into and connected to the branch connection portion and the pipe joint that are connected to each other through the opening.

  According to the present invention, after connecting a pipe joint to the branch connection part in the header and abutting the flanges, the accommodating part is fitted into the opening end part of the branch connection part and the intermediate part of the pipe joint through the opening of the connecting member. For example, the pair of flanges enter the guide groove of the connecting member to cover the pair of flanges, and the guide groove sandwiches the pair of flanges from both sides in the front-rear direction, so that the connection can be prevented from coming off.

  As a result, since the connecting member covers the flange of the branch connection part and the flange of the pipe joint that are abutted, even if the pulling force acts on the pipe joint, the branch connection that makes contact with the connecting member over a large area It can be dispersed and evenly supported by the flange of the part and the flange of the pipe joint, the strength is improved, and the concentration of load on the pair of flanges can be suppressed. Furthermore, by adopting a connecting member made of synthetic resin, the thickness can be sufficiently increased without increasing the weight, and the strength can be secured without impairing the workability.

  Here, the synthetic resin for forming the header is not particularly limited. For example, when a high-temperature strength is required, it is preferable to use engineering plastics such as polyether sulfone and polyphenyl sulfone. On the other hand, olefin-based resins such as vinyl chloride, polyethylene, polypropylene, and polybutene may be used when water strength is not particularly required at high temperatures.

  In the present invention, a plurality of annular grooves and a plurality of flanges formed by a plurality of annular grooves are formed at an opening end portion of the branch connection portion at intervals in the axial direction, and a plurality of branch connection portions are formed in the accommodating portion of the connecting member. A plurality of substantially semicircular cylindrical surfaces corresponding to the annular groove and an inner peripheral surface made up of a pair of opposed flat surfaces continuous to the cylindrical surface are formed, and a plurality of flanges corresponding to a plurality of flanges are formed on the inner peripheral surface. A guide groove is preferably formed.

  As a result, the connecting member covers the flange of the branch connection portion and the flange of the pipe joint that are abutted together, and the other flange of the branch connection portion. Therefore, even if a pulling force acts on the pipe joint, the branch to the connection member The contact area of the flange of the connecting portion and the flange of the pipe joint is increased, the load can be dispersed and supported uniformly, and the strength is further improved.

  In this invention, it is preferable that the cylindrical surface of the said connection member is contacting 55% or more of those circumferential lengths with the outer peripheral surface of the annular groove of a branch connection part, and the outer peripheral surface of the annular groove of a pipe joint.

  Thereby, since the load which acts on a connection member and an annular groove can be disperse | distributed, sufficient intensity | strength can be acquired at the time of withdrawal of a connection member from an annular groove, even if a connection member is a product made from a synthetic resin.

  However, when the contact degree of the cylindrical surface of the connecting member with respect to the annular groove is increased, it must be elastically deformed by pressing with a large force when the connecting member is fitted, in consideration of prevention of pull-out and workability, and It is necessary to appropriately set the contact degree in consideration of the material and thickness of the connecting member.

  In the present invention, when the fitting portion is formed near the tip of the flat surface constituting the inner peripheral surface of the housing portion in the connecting member, the cap is attached to the opening of the connecting member using the fitting portion. Can be held.

  In the present invention, a cap for closing the opening of the connecting member is provided, and the cap has an opening having a width substantially corresponding to the outer diameter of the annular groove of the branch connection portion and the outer diameter of the annular groove of the pipe joint at the tip. In addition, the inner back portion has a housing portion that can accommodate the opening end portion of the branch connection portion and the intermediate portion of the pipe joint, and is formed in a substantially C-shape. An inner peripheral surface consisting of a substantially semicircular cylindrical surface having an inner diameter corresponding to the diameter and the outer diameter of the annular groove of the pipe joint is formed, and the flange of the butted branch connection portion and the pipe joint are joined to the inner peripheral surface. A guide groove having a width corresponding to the thickness of the flange and an inner diameter corresponding to the outer diameter of the flange is formed over the entire circumference, and further, overlapped with a plane constituting the inner peripheral surface of the connecting member on the outer surface of each tip portion thereof Possible planes and guides that can be fitted in the guide grooves With Article are formed, it is preferable that the fitted portion can be fitted into the fitting portion of the coupling member is formed.

  Thereby, the contact area with respect to the annular groove of a branch connection part and the annular groove of a pipe joint can be increased with a connection member and a cap. Therefore, even if the branch connection portion is deformed and expanded due to hot water supply or the like, a frictional force is generated by the product of the pulling force acting in the axial direction of the branch connection portion and the contact area, and the coupling member is opened by a larger frictional force. Can be regulated.

  In the present invention, when a reinforcing ring is provided on the outer peripheral surface of the opening end side flange of the branch connection portion of the header, the branch connection portion can be reliably prevented from being softened by hot water supply and deformed and expanded. it can.

  In the present invention, when the reinforcing ring is disposed by insert molding, shrinkage deformation after molding or after crosslinking treatment can be prevented, and dimensional stability important for sealing performance can be obtained.

  The present invention includes a header made of a synthetic resin, which includes a header main body portion and a branch connection portion that protrudes from the outer peripheral surface of the header main body portion and has a connection portion and a flange formed at an opening end portion, and the branch connection at one end portion. A pipe joint having an insertion port that can be inserted into the connecting part of the part, a pipe mounting part that can connect a branch pipe to the other end, and an inner diameter corresponding to the outer diameter of the connecting part of the branch connecting part A tubular body integrally formed with a body portion connectable to the insertion port portion of the pipe joint, and a flange capable of abutting with a flange of the branch connection portion at one end portion of the body portion, and the insertion port portion of the pipe joint and the pipe A cylinder connected to the joint opening of the joint is inserted into the connection part of the branch connection part, and is composed of a branch connection part in which the flanges are abutted with each other and a connection member that connects the cylinders. Branch connection franc at the tip A cylindrical portion adjacent to the proximal end side of the flange of the branch connection portion and an opening corresponding to the outer diameter of the cylindrical portion adjacent to the proximal end side and the outer diameter of the main body portion of the cylindrical body It has an accommodating portion that can accommodate the main body portion of the cylindrical body, and is formed in a substantially U shape. The accommodating portion includes an outer diameter of the cylindrical portion adjacent to the proximal end side of the flange of the branch connection portion and the cylindrical body A dominant arc-shaped cylindrical surface having an inner diameter corresponding to the outer diameter of the main body and an inner peripheral surface made of a pair of planes continuous to the cylindrical surface are formed, and the inner peripheral surface has a butted branch connection portion A guide groove having a width corresponding to the thickness of the flange and the flange of the cylinder and an inner diameter corresponding to the outer diameter of the flange is formed over the entire circumference, and is connected to the inlet of the pipe joint and the inlet of the pipe joint. Inserted into the connecting part of the branch connection part, Flanges of di- and cylindrical member are butted, these branch connection portion and the tubular body, is characterized in that the coupling is fitted a housing portion of the connecting member through the opening.

  According to the present invention, the cylindrical body is connected to the inlet portion of the pipe joint, while the outlet portion and the cylindrical body of the pipe joint connected to each other are inserted into the connecting portion of the branch connection portion, and the flange of the branch connection portion and After the flanges of the cylinders are abutted with each other, if the accommodating part is fitted into the cylindrical part adjacent to the base end side of the flange of the branch connection part and the main body part of the cylinder through the opening of the connection member, The flanges enter and cover the pair of flanges, and the guide groove sandwiches the pair of flanges from both sides in the front-rear direction, so that they can be connected without being pulled out.

  As a result, since the connecting member covers the flange of the branch connection portion and the flange of the cylinder that are abutted, even if the pulling force acts on the pipe joint, the branching connection that contacts the pulling force with a large area on the connecting member Can be dispersed and supported uniformly by the flange of the cylinder and the flange of the cylinder connected to the pipe joint, the strength can be improved, and the concentration of the load on the pair of flanges can also be suppressed. Furthermore, by adopting a connecting member made of synthetic resin, the thickness can be sufficiently increased without increasing the weight, and the strength can be secured without impairing the workability. In addition, since the cylindrical body covers the connecting portion of the branch connection portion, the expansion of the opening end can be suppressed, and the occurrence of water leakage due to the expansion deformation can be reliably prevented.

  In the present invention, an engagement groove is formed in the middle portion of the pipe joint adjacent to the insertion port side of the flange, while the pipe joint is engaged with the inner peripheral surface on the other end side of the main body portion of the cylindrical body. When the engaging claw that can be engaged with the groove is formed, the tubular body can be easily connected to the pipe joint.

  In the present invention, the cylindrical surface of the connecting member is 55% or more of the circumferential length on the outer peripheral surface of the cylindrical portion adjacent to the proximal end side of the flange of the branch connection portion and the outer peripheral surface of the main body portion of the cylindrical body. It is preferably in contact.

  As a result, it is possible to disperse the load acting on the connecting member, the cylindrical portion adjacent to the base end side of the flange of the branch connecting portion, and the main body portion of the cylindrical body, so that even if the connecting member is made of synthetic resin Sufficient strength can be obtained when the member is pulled out.

  However, when the degree of contact of the cylindrical surface of the connecting member with the cylindrical portion adjacent to the base end side of the flange of the branch connecting portion and the main body portion of the cylindrical body increases, the connecting member must be pushed in with a large force to be elastically deformed. In addition, it is necessary to appropriately set the degree of contact in consideration of prevention of pull-out and workability, and in consideration of the material and thickness of the connecting member.

  According to the present invention, the resin header and the pipe joint can be easily connected by the fastener connection using the resin connection member, and the connection state is reliably maintained even if the pulling force acts on the connection portion. can do.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 shows an embodiment of a connection structure between a header and a pipe joint according to the present invention.

  This connection structure includes a synthetic resin header 10, a pipe joint 20 that can be connected to the header 10, and a synthetic resin connection that connects the header 10 and the pipe joint 20 when the pipe joint 20 is connected to the header 10. And a member 30.

  As shown in FIG. 2, the header 10 includes a substantially cylindrical header main body 11 and a plurality of branch connection portions 12 protruding from the outer peripheral surface of the header main body 11. The annular grooves 13 and 14 are formed at the opening ends of the first and second branch connection portions 12, and flanges 15 and 16 are formed by the annular grooves 13 and 14, and are formed of synthetic resin.

  Here, as the synthetic resin for molding the header 10, in addition to engineering plastics having high strength at high temperatures, vinyl chloride, polybutene, crosslinked polyethylene, and the like can be employed.

  For example, as shown in FIG. 2, the pipe joint 20 has an insertion portion 21 that can be inserted into the branch connection portion 12 of the header 10 at one end portion, and a branch pipe (not shown) can be attached to the other end portion. And a flange 23 having the same outer diameter as the flange 16 of the branch connection portion 12 in the header 10 is formed at the intermediate portion, and the branch connection portion 12 is located on the back side of the flange 23. An annular groove 24 having the same outer diameter as the annular groove 14 is formed, and is manufactured from brass, bronze, a composite structure of these metals and a synthetic resin, a synthetic resin, or the like.

  The connecting member 30 has an opening 31 having a width slightly smaller than the outer diameter of the annular groove 14 of the branch connection portion 12 in the header 10 and the outer diameter of the annular groove 24 of the pipe joint 20 at the tip, and the header at the inner back portion. 10 includes an opening end portion of the branch connection portion 12 and an intermediate portion of the pipe joint 20, and is formed in a substantially U shape by a synthetic resin.

  The accommodating portion 32 of the connecting member 30 has a substantially semicircular cylindrical surface 33 having an inner diameter corresponding to the outer diameter of the annular groove 14 of the branch connection portion 12 and the outer diameter of the annular groove 24 of the pipe joint 20 in the header 10. Further, an inner peripheral surface 35 composed of a pair of flat surfaces 34, 34 continuous with the cylindrical surface 33 is formed. Further, the inner peripheral surface 35 of the accommodating portion 32 in the connecting member 30 has a width corresponding to the thickness when the flange 16 of the branch connection portion 12 and the flange 23 of the pipe joint 20 in the header 10 are abutted, and the flange 16, 23 corresponds to the difference between the radius of the flange 16 (flange 23) and the radius of the annular groove 14 of the branch connection portion 12 in the header 10 (the radius of the annular groove 24 of the pipe joint 20). A guide groove 36 having a depth to be formed is formed over the entire circumference corresponding to the cylindrical surface 33 and the pair of flat surfaces 34, 34 of the inner peripheral surface 35.

  Here, the circumferential length of the cylindrical surface 33 constituting the inner peripheral surface 35 of the accommodating portion 32 in the connecting member 30 is the circumferential length of the annular groove 14 of the branch connection portion 12 in the header 10 and the pipe joint 20. Similarly, the circumferential length of the substantially semicircular cylindrical surface of the guide groove 36 corresponding to the cylindrical surface 33 of the inner peripheral surface 35 is also set to 60% of the circumferential length of the annular groove 24. , 23, which is 60% of the circumferential length.

  In this case, the side where the cylindrical surface 33 and the flat surface 34 intersect is obtained at a position advanced by 5% in the circumferential direction from the tip of the semicircle, and the flat surface 34 is continuous from the position so as to be orthogonal to the diameter of the semicircle. Then, the distance between the pair of opposed flat surfaces 34, 34, that is, the distance between the openings 31 is 98 of the outer diameter of the annular groove 14 of the branch connection portion 12 and the outer diameter of the annular groove 24 of the pipe joint 20 in the header 10. 8%.

  In addition, as the synthetic resin for forming the connecting member 30, it is desirable to use engineering plastics such as polyacetal, polyethersulfone, polyphenylene sulfide, polysulfone, and polyphenylsulfone when the temperature becomes high, such as for hot water supply. On the other hand, when the temperature is not high, such as for water supply, general-purpose resins such as vinyl chloride, polybutene, cross-linked polyethylene, and polyethylene can be employed.

  Next, the case where the pipe joint 20 is connected to the branch connection part 12 of the header 10 and the branch connection part 12 and the pipe joint 20 of the connected header 10 are connected using the connecting member 30 will be described.

  First, after inserting and connecting a branch pipe to the pipe mounting portion 22 of the pipe joint 20, the outlet portion 21 of the pipe joint 20 connecting the branch pipe is inserted into the branch connection portion 12 in the header 10, and the flanges 16, Match 23. Next, the opening 31 of the connecting member 30 is exposed to the outside of the annular groove 14 of the branch connection portion 12 and the annular groove 24 of the pipe joint 20 in the header 10, and the flange 16, In accordance with 23, it fits in the diameter direction orthogonal to the axial direction of the branch connection part 12 and the pipe joint 20. As a result, the connecting member 30 determines the interval between the openings 31, that is, the interval between the pair of opposed flat surfaces 34 constituting the inner peripheral surface 35 in the housing portion 32, and the outer diameter of the annular groove 14 of the branch connection portion 12 in the header 10. Slightly elastically deforms and expands to a width corresponding to the outer diameter of the annular groove 24 of the pipe joint 20, and accommodates the annular groove 14 of the branch connection portion 12 and the annular groove 24 of the pipe joint 20 across their outer peripheral surfaces. It can be accommodated in the part 32. At this time, the flange 16 of the branch connection portion 12 and the flange 23 of the pipe joint 20 are also accommodated in the guide groove 36 formed in the inner peripheral surface 35.

  At this time, the cylindrical surface 33 is in contact with the outer peripheral surface of the annular groove 14 of the branch connection portion 12 and the outer peripheral surface of the annular groove 24 of the pipe joint 20 with 60% of the circumferential length thereof. A substantially semicircular cylindrical surface portion of the guide groove 36 formed in 33 is in contact with the outer peripheral surfaces of the flanges 16 and 23 and 60% of their circumferential length.

  As a result, the connecting member 30 made of synthetic resin covers the flange 16 of the branch connection portion 12 and the flange 23 of the pipe joint 20 in the resin header 10 to connect to the branch connection portion 12 of the header 10 and the branch connection portion 12. Since the pipe joint 20 is connected, the problem of strength and the problem of the contact area between the flanges 16 and 23 and the connecting member 30 can be solved. That is, since the connecting member 30 covers the flange 16 of the branch connection portion 12 and the flange 23 of the pipe joint 20, even if a pulling force acts on the pipe joint 20 due to a water hammer phenomenon, the pulling force is applied to the connecting member. 30 can be uniformly distributed and supported by the contact area of the flange 16 of the branch connection portion 12 to the flange 30 and the flange 23 of the pipe joint 20, and the strength can be improved and the concentration of loads on the flanges 16 and 23 can be suppressed. it can. Furthermore, by employing the synthetic resin connecting member 30, the thickness can be sufficiently increased without increasing the weight, and the strength can be ensured without impairing the workability.

  On the other hand, in embodiment mentioned above, although the case where the branch connection part 12 and the pipe joint 20 of the header 10 were connected using the connection member 30 was demonstrated, since the opening 31 of the connection member 30 will be in the open state. When a high-temperature fluid such as hot water is circulated, depending on the synthetic resin forming the header 10, the branch connection portion 12 may be softened and expanded and deformed, thereby increasing the width of the opening 31 of the connecting member 30. If a force is applied in the expanding direction, the sealing performance with the insertion port 21 of the pipe joint 20 may be impaired and water leakage may occur. Therefore, it is preferable to restrict the opening of the opening 31 of the connecting member 30 in order to prevent deformation and expansion of the branch connection portion 12. Moreover, it is preferable to close the opening 31 from the viewpoint of safety and appearance.

  For this reason, the cap 40 which regulates and closes the opening of the opening 31 of the connection member 30 is prepared.

  As shown in FIG. 5 and FIG. 6 together with the connecting member 30 described above, the cap 40 is substantially at the distal end with the outer diameter of the annular groove 14 of the branch connection portion 12 in the header 10 and the outer diameter of the annular groove 24 of the pipe joint 20. It has an opening 41 with a corresponding width, and has an accommodating part 42 that can accommodate substantially half of the opening end of the branch connection part 12 in the header 10 and substantially half of the intermediate part of the pipe joint 20 in the inner back part. It is formed in a substantially C shape by the same synthetic resin as the member 30.

  Then, the accommodating portion 42 of the cap 40 has a substantially semicircular cylindrical surface 43 having an inner diameter corresponding to the outer diameter of the annular groove 14 of the branch connection portion 12 and the outer diameter of the annular groove 24 of the pipe joint 20 in the header 10. The inner peripheral surface 45 is formed, and the inner peripheral surface 45 of the accommodating portion 42 has a width corresponding to the thickness of the header 10 and the flange 16 of the branch connection portion 12 and the flange 23 of the pipe joint 20 butted together, A guide groove 46 having an inner diameter corresponding to the outer diameter of the flanges 16 and 23 is formed over the entire circumference.

  Further, on the outer surface of the front end portion of the cap 40, flat surfaces 44, 44 are formed over a set length with an interval corresponding to the interval between a pair of opposed flat surfaces 34, 34 constituting the inner peripheral surface 35 of the connecting member 30. In addition, the flat surfaces 44, 44 have a width corresponding to the thickness of the pair of flanges 16, 23, the radius of the flanges 16, 23, the radius of the annular groove 14 of the branch connection portion 12 in the header 10, and the tube. Guide protrusions 47 and 47 having a height corresponding to the difference from the radius of the annular groove 24 of the joint 20 are formed. The flat surface 44 can overlap with the flat surface 34 constituting the inner peripheral surface 35 of the connecting member 30, and the guide protrusion 47 is a guide groove 36 formed in the flat surface 34 constituting the inner peripheral surface 35 of the connecting member 30. Polymerization is possible.

  Further, on each flat surface 44 formed on the outer surface of the tip of the cap 40, a pair of fitting ridges 441 serving as fitting portions that are located in the vicinity of the tip of the cap 40 and project outward are provided on the header 10. Are formed in parallel to the axial direction of the branch connection portion 12 (the axial direction of the pipe joint 20). The fitted portion 441 is set so as to be fitted with a pair of fitting grooves 34 a as fitting portions respectively formed in the vicinity of the tip portions of the pair of flat surfaces 34 constituting the inner peripheral surface 35 of the connecting member 30. Has been.

  Thus, the flat surface 44 of the cap 40 and the guide protrusion 47 are superimposed on the flat surface 34 constituting the inner peripheral surface 35 of the connecting member 30 and the guide groove 36 formed on the flat surface 34, and the fitting of the connecting member 30 is performed. When the fitting protrusion 441 of the cap 40 is fitted in the joint groove 34a, the outer diameter of the annular groove 14 of the branch connection portion 12 in the header 10 and the annular shape of the pipe joint 20 are centered by the connecting member 30 and the cap 40. A hole made of a cylindrical surface 33 and a cylindrical surface 43 having an inner diameter corresponding to the outer diameter of the groove 24 is formed, and the flange 16 of the branch connection portion 12 and the flange 23 of the pipe joint 20 in the header 10 are butted against the inner peripheral surface thereof. A flat octagonal column in which a guide groove 36 and a guide groove 46 having an inner diameter corresponding to the outer diameter of the flanges 16 and 23 are formed. It is erected seen (see Fig. 6 (d)).

  Next, the case where the branch connection part 12 of the header 10 and the pipe joint 20 are connected using the connecting member 30 and the cap 40 thus configured will be described.

  As described above, the insertion port 21 of the pipe joint 20 connected to the branch pipe is inserted into the branch connection portion 12 of the header 10, the flanges 16 and 23 are abutted and connected, and then the branch connection portion 12 of the header 10 is connected. The connecting member 30 is fitted into the opening end of the tube and the intermediate portion of the pipe joint 20. As a result, the connecting member 30 slightly elastically deforms the gap between the openings 31 to a width corresponding to the outer diameter of the annular groove 14 of the branch connection portion 12 and the outer diameter of the annular groove 24 of the pipe joint 20 in the header 10. The annular groove 14 of the branch connection portion 12 and the annular groove 24 of the pipe joint 20 can be accommodated in the accommodating portion 32 over their outer peripheral surfaces. At this time, the flange 16 of the branch connection portion 12 and the flange 23 of the pipe joint 20 are also accommodated in the guide groove 36 formed in the inner peripheral surface 35.

  Next, the cap 40 is fitted into the opening end portion of the branch connection portion 12 in the header 10 and the intermediate portion of the pipe joint 20 so as to close the opening 31 of the coupling member 30 fitted. That is, the opening 41 of the cap 40 may be opposed to the opening 31 of the connecting member 30 and fitted into the diameter direction perpendicular to the axial direction of the branch connection portion 12 and the pipe joint 20. As a result, the flat surface 44 and the guide protrusion 47 of the cap 40 overlap with each other along the flat surface 34 and the guide groove 36 constituting the circumferential surface 35 of the connecting member 30, and the fitting protrusion 441 is connected to the connecting member 30. By fitting in the fitting groove 34a, the annular groove 14 of the branch connection portion 12 and the annular groove 24 of the pipe joint 20 can be accommodated in the accommodation portion 42, and the flange 16 of the branch connection portion 12 and The flange 23 of the pipe joint 20 can be accommodated in a guide groove 46 formed on the inner peripheral surface 45.

  In this case, the circumferential length of the cylindrical surface 33 constituting the inner peripheral surface 35 of the accommodating portion 323 in the connecting member 30, and the circumferential length of the inner peripheral surface 45 (cylindrical surface 43) of the accommodating portion 42 in the cap 40. Is set to 90% of the circumferential length of the annular groove 14 of the branch connection portion 12 and the annular groove 24 of the pipe joint 20.

  In this way, by connecting the branch connection portion 12 of the header 10 and the pipe joint 20 using the connection member 30 and the cap 40, the connection member 30 for the annular groove 14 of the branch connection portion 12 and the annular groove 24 of the pipe joint 20. In addition, the contact area of the cap 40 can be increased. Therefore, when the branch connection portion 12 tends to deform and expand due to hot water supply or the like, and the connection member 30 receives a force to expand the opening 31 thereof, the pulling force acting in the axial direction of the branch connection portion 12 and the aforementioned A frictional force is generated by the product of the contact area and the opening of the connecting member 30 can be restricted. In this case, since the contact area increases as compared with the case where only the connecting member 30 is used, a larger frictional force can be generated, and the opening of the connecting member 30 can be regulated by the large frictional force.

  In the embodiment described above, the pipe joint 20 to which the branch pipe is connected is connected to the branch connection part 12 of the header 10, and the opening end part of the branch connection part 12 and the intermediate part of the pipe joint 20 are connected by the connecting member 30. Alternatively, the case of coupling by the coupling member 30 and the cap 40 has been described, but the header body 11 of the header 10 is connected to a pipe joint 20 to which a water supply and hot water main pipe is connected, and the opening end of the header body 11 is The intermediate portion of the pipe joint 20 can be connected by the connecting member 30, or can be connected by the connecting member 30 and the cap 40.

  Further, when connecting the header body portions 11 of the header 10 or closing one end portion of the header body portion 11, the opening end portions of the header body portions, the opening end portion of the header body portion and the end portion of the closing member Can be connected by the connecting member 30, or can be connected by the connecting member 30 and the cap 40.

  Incidentally, FIG. 7 shows another embodiment of the connection structure of the header and pipe joint of the present invention.

  In the connection structure of this embodiment, as shown in FIG. 8, the header 10 has a plurality of annular shapes at an opening end portion of the header main body portion 11 and an opening end portion of the branch connection portion 12 with an interval in the axial direction. The grooves 13 and 14 are formed, and the plurality of flanges 15 and 16 are formed by the plurality of annular grooves 13 and 14. Accordingly, the connecting member 50 is connected to the branch connection portion 12 of the header 10 described above. Are formed in a shape corresponding to the opening end of the tube and the intermediate portion of the pipe joint 20. In this case, the outer diameter of the annular groove 14 of the branch connection portion 12 in the header 10 is formed larger than the outer diameter of the annular groove 24 of the pipe joint 20.

  In addition, since the pipe joint 20 does not differ, detailed description is attached | subjected and abbreviate | omitted.

  As shown in FIG. 9, the connecting member 50 has an opening 51 having a width slightly smaller than the outer diameter of the annular groove 14 of the branch connection portion 12 and the outer diameter of the annular groove 24 of the pipe joint 20 at the tip. In addition, it has an accommodating portion 52 capable of accommodating the opening end portion of the branch connection portion 12 in the header 10 and the intermediate portion in the pipe joint 20 at the inner back portion, and is formed in a substantially U shape by a synthetic resin.

The accommodating portion 52 of the connecting member 50 is continuous with the substantially semicircular cylindrical surface 53 _{1 having} an inner diameter corresponding to the outer diameter of the annular groove 14 of the branch connection portion 12 in the header 10 and each cylindrical surface 53 _1. A plurality of inner peripheral surfaces 55 ₁ composed of a pair of flat surfaces 54 ₁ , 54 ₁ are formed at intervals in the axial direction in accordance with the number corresponding to the number of annular grooves 14 of the branch connection portion 12 and the arrangement thereof. ing. Further, the accommodating portion 52 of the connecting member 50 includes a substantially semicircular cylindrical surface 53 _{2 having} an inner diameter corresponding to the outer diameter of the annular groove 24 of the pipe joint 20 and a pair of flat surfaces 54 respectively continuous with the cylindrical surface 53 _{2. An} inner peripheral surface 55 ₂ composed of ₂ and 54 ₂ is formed on one end side of the connecting member 50 in the front-rear direction.

Further, between the adjacent inner peripheral surfaces 55 ₁ and 55 ₂ of the accommodating portion 52 in the connecting member 50, this corresponds to the thickness when the flange 16 of the branch connection portion 12 and the flange 23 of the pipe joint 20 in the header 10 are abutted. the width, the inner diameter of the guide groove 56 ₁ corresponding to the outer diameter of the flange 16, the inner circumferential surface 55 _1, 55 ₂ of the cylindrical surface 53 _1, 53 ₂ and a pair of plane 54 _1, 54 _1, 54 _2, 54 It is formed over the entire circumference corresponding to ₂ . Furthermore, between the adjacent inner peripheral surfaces 55 ₁ and 55 ₁ of the accommodating portion 52 in the connecting member 50 and the other end side in the front-rear direction of the connecting member 50, this corresponds to the thickness of the flange 16 of the branch connecting portion 12 in the header 10. and width, a plurality of guide grooves 56 _{and second} inside diameter corresponding to the outside diameter of the flange 16, in accordance with the number and the sequence corresponding to the number of the flange 16 of the branch connection portion 12, and the inner peripheral surface 55 ₁ Corresponding to the cylindrical surface 53 ₁ and the pair of flat surfaces 54 ₁ , 54 ₁ .

Here, the circumferential lengths of the cylindrical surfaces 53 ₁ and 53 ₂ constituting the inner peripheral surfaces 55 ₁ and 55 ₂ of the accommodating portion 52 in the connecting member 50 are the circles of the annular groove 14 of the branch connection portion 12 in the header 10. The circumferential length and 60% of the circumferential length of the annular groove 24 of the pipe joint 20 are set, and similarly, the guide grooves 56 corresponding to the cylindrical surfaces 53 ₁ and 53 ₂ of the inner circumferential surfaces 55 ₁ and 55 _{2. 1,} 56 is also circumferential length of the substantially semicircular cylindrical surface ₂ has become 60% of the circumference length of the flange 16, 23.

Further, in the vicinity of the distal end portion of the plane 54 ₂ constituting the inner circumferential surface 55 ₂ of the connecting member 50, to hold the cap 60 to be described later, the fitting groove 54a ₂ of the fitting portion is formed. Similarly, of the planes constituting the guide groove 56 and _second coupling member 50, in vicinity of the distal end portion of the plane located at the other end in the longitudinal direction, for holding the cap 60, the fitting groove of the fitting portion 54a ₁ are formed.

  In addition, as above-mentioned as a synthetic resin which shape | molds the connection member 50, when heat resistance is required, engineering plastics, such as polyacetal, polyether sulfone, polyphenylene sulfide, polysulfone, and polyphenylene sulfone, are used. On the other hand, when heat resistance is not required, general-purpose resins such as vinyl chloride, polybutene, cross-linked polyethylene, and polyethylene can be employed.

  Next, a case where the pipe joint 20 is connected to the branch connection portion 12 of the header 10 and the branch connection portion 12 and the pipe joint 20 of the connected header 10 are connected using the connecting member 50 will be described with reference to FIG. .

First, as described above, the insertion port 21 of the pipe joint 20 having a branch pipe (not shown) connected to the branch connection part 12 of the header 10 is inserted, and the flanges 16 and 23 are abutted. Then, the flange 16 of the opening 51 of the connecting member 50, causes exposed to outside of the annular groove 24 of the annular groove 15 and the pipe joint 20 of the branch connection portion 12 of the header 10, abut the distal end portion of the guide groove 56 ₁ , 23 and is fitted toward the diameter direction perpendicular to the axial direction of the branch connection portion 12. As a result, the connecting member 50 is slightly elastically deformed to a width corresponding to the outer diameter of the annular groove 14 of the branch connection portion 12 and the outer diameter of the annular groove 24 of the pipe joint 20 in the header 10. The annular groove 14 of the branch connection portion 12 and the annular groove 24 of the pipe joint 20 can be accommodated in the accommodating portion 52 over the outer peripheral surface thereof. At this time, the plurality of flanges 16 of the branch connection portion 12 and the flange 23 of the pipe joint 20 are also accommodated in the guide grooves 56 ₁ and 56 ₂ formed in the inner peripheral surfaces 55 ₁ and 55 ₂ .

At this time, the cylindrical surface 53 ₁ is in contact with 60% of each outer peripheral surface of the plurality of annular grooves 14 of the branch connection portion 12, and the cylindrical surface 53 ₂ is 60 of the outer peripheral surface of the annular groove 24 of the pipe joint 20. % and in contact, likewise, the cylindrical surface 53 _1, 53 ₂ guide groove 56 ₁ formed in, 56 ₂ semicircular cylindrical surface portion of contact 60% of the outer peripheral surface of the flange 16 and 23 Yes.

  As a result, the joint member 50 made of synthetic resin covers the plurality of flanges 16 of the branch connection portion 12 and the flange 23 of the pipe joint 20 in the resin header 10, so that the branch connection portion 12 of the header 10 and the branch connection portion 12 are covered. Since the pipe joint 20 connected to the pipe is coupled, the problem of strength and the problem of the contact area between the flanges 16 and 23 and the coupling member 50 can be solved. That is, since the connecting member 50 has a structure covering the flange 16 of the branch connection portion 12 and the flange 23 of the pipe joint 20, even if a pulling force acts on the pipe joint 20 due to a water hammer phenomenon or the like, the pulling force is applied to the connecting member. 50 can be dispersed and supported by the contact area of the flange 16 of the branch connection portion 12 with respect to 50 and the flange 23 of the pipe joint 20, and the strength can be improved and the concentration of loads on the flanges 16 and 23 can be suppressed. it can. Further, by employing the synthetic resin connecting member 50, the thickness can be sufficiently increased without increasing the weight, and the strength can be ensured without impairing the workability.

  In addition, when the plurality of flanges 16 of the branch connection portion 12 in the resin header 10 and the flange 23 of the pipe joint 20 are covered with the connecting member 50, the contact area is further increased, and the resin header 10 is molded with a general-purpose resin such as crosslinked polyethylene. In this case, sufficient strength can be obtained. As the number of the flanges 16 increases, the strength is more advantageous, but the length increases accordingly. Even with the two flanges 16, a sufficient increase in strength can be achieved.

  By the way, also in the connection member 50 mentioned above, the cap 60 which regulates and closes the opening of the opening 51 is prepared.

  As shown in FIGS. 11 and 12 together with the connecting member 50, the cap 60 substantially corresponds to the outer diameter of the annular groove 14 of the branch connection portion 12 in the header 10 and the outer diameter of the annular groove 24 of the pipe joint 20 at the tip. The connecting member 50 has an opening 61 having a width, and an accommodating portion 62 that can accommodate substantially half of the opening end portion of the branch connection portion 12 in the header 10 and substantially half of the intermediate portion of the pipe joint 20 in the inner depth portion. Are substantially C-shaped by the same synthetic resin.

In the housing portion 62 of the cap 60, a plurality of substantially semicircular cylindrical surfaces 63 _{1 having} an inner diameter corresponding to the outer diameter of the annular groove 14 of the branch connection portion 12 in the header 10, similar to the connecting member 50. the inner peripheral surface 65 ₁ is formed at intervals in the axial direction in accordance with the number and the sequence corresponding to the number of the annular groove 14 of the branch connection portion 12. Further, an inner circumferential surface 65 ₂ formed of a substantially semicircular cylindrical surface 63 _{2 having} an inner diameter corresponding to the outer diameter of the annular groove 24 of the pipe joint 20 is provided in the housing portion 62 of the cap 60 at one end in the front-rear direction of the cap 60. It is located on the side.

In addition, a width corresponding to the thickness when the flange 16 of the branch connection portion 12 and the flange 23 of the pipe joint 20 in the header 10 are abutted between the inner peripheral surfaces 65 ₁ and 65 _{2 of} the cap 60 adjacent to each other. The guide groove 66 ₁ having an inner diameter corresponding to the outer diameter of the flange 16 is formed over the entire circumference corresponding to the cylindrical surfaces 63 ₁ and 63 ₂ of the inner peripheral surfaces 65 ₁ and 65 ₂ . Further, a width corresponding to the thickness of the flange 16 of the branch connection portion 12 in the header 10 is formed between the adjacent inner peripheral surfaces 65 ₁ and 65 ₁ of the accommodating portion 62 in the cap 60 and the other end side in the front-rear direction of the cap 60. The plurality of guide grooves 66 ₂ having an inner diameter corresponding to the outer diameter of the flange 16 are matched to the number corresponding to the number of flanges 16 of the branch connection portion 12 and the arrangement thereof, and the inner peripheral surface 65 ₁ is formed. It is formed over the entire circumference corresponding to the cylindrical surface 63 ₁ .

Further, the cap 60 at the distal end outer surface, with spaced corresponding to the spacing between the pair of planes 54 _1, 54 ₁ facing constituting a plurality of the inner peripheral surface 55 ₁ of the connecting member 50, a plurality of A plurality of planes 64 ₁ having an interval in the axial direction corresponding to the arrangement of the inner peripheral surfaces 55 ₁ and having a width corresponding to the width of each plane 54 ₁ are formed over a set length. Further, a plane 64 ₂ is formed over a set length at an interval corresponding to the interval between a pair of opposed planes 54 ₂ , 54 ₂ constituting the inner peripheral surface 55 ₂ of the connecting member 50. These planes 64 ₁ and 64 ₂ are set so as to be superposed on the plane 54 ₁ constituting the inner peripheral surface 55 ₁ of the connecting member 50 and the plane 54 ₂ constituting the inner peripheral surface 55 ₂ .

Further, the distal end portion outer surface of the cap 60, the connecting member corresponding to the guide groove 56 ₁ of 50, the guide groove 56 _first guide rib 67 ₁ and a pair of planar polymerizable opposed constituting the set length together is formed over, in response to a plurality of guide grooves 56 _2, formed over the guide groove 56 a pair of opposing planar and polymerizable plurality of guide protrusions 67 ₂ set length constitutes ₂ Has been.

Furthermore, the flat 64 ₂ formed on the tip outer surface of the cap 60, positioned near its distal end, the fitting projection 68 ₁ of the fitted portion that protrudes outward header 10 It is formed in parallel with the axial direction of the branch connection portion 12. The fitting projection 68 ₁ is set to the fitting groove 54a ₂ and fitting the inner peripheral surface 55 is formed in the vicinity of the distal end portion of the plane 54 ₂ constituting the _second coupling member 50. Further, among the plurality of guide protrusions 67 _2, the guide rib 67 ₂ located in the front-rear direction of the other end side of the cap 60, positioned near the distal end, projecting outwardly under fitting projections 68 ₂ of the fitting portion is formed parallel to the axial direction of the branch connection portion 12 of the header 10. The fitting projection 68 ₂ is set to the fitting groove 54a ₁ and fitting the inner peripheral surface 55 is formed in the vicinity of the distal end portion of the plane 54 ₂ constituting the _second coupling member 50.

  Next, the case where the branch connection part 12 of the header 10 and the pipe joint 20 are connected using the connecting member 50 and the cap 60 will be described.

As described above, the insertion port 21 of the pipe joint 20 connected to the branch pipe is inserted into the branch connection portion 12 of the header 10, the flanges 16 and 23 are abutted and connected, and then the branch connection portion 12 of the header 10 is connected. The connecting member 50 is fitted into the open end of the tube and the intermediate portion of the pipe joint 20. As a result, the connecting member 50 is slightly elastically deformed to a width corresponding to the outer diameter of the annular groove 14 of the branch connection portion 12 and the outer diameter of the annular groove 24 of the pipe joint 20 in the header 10. The annular groove 14 of the branch connection portion 12 and the annular groove 24 of the pipe joint 20 can be accommodated in the accommodating portion 52 over the outer peripheral surface thereof. At this time, the plurality of flanges 16 of the branch connection portion 12 and the flange 23 of the pipe joint 20 are also accommodated in the guide grooves 56 ₁ and 56 ₂ formed in the inner peripheral surfaces 55 ₁ and 55 ₂ .

Next, the cap 60 is fitted into the opening end portion of the branch connection portion 12 and the intermediate portion of the pipe joint 20 in the header 10 so as to close the opening 51 of the coupling member 50 fitted. That is, the opening 61 of the cap 60 may be opposed to the opening 51 of the connecting member 50 and fitted in the diameter direction perpendicular to the axial direction of the branch connection portion 12. Thus, plane 64 ₁ of the cap 60, 64 ₂ and the guide ribs 67 _1, 67 ₂ plane 54 ₁ constituting the circumferential surface 55 _1, 55 ₂ of the connecting members 50, 54 ₂ and the guide grooves 56 _1, 56 ₂ , and the fitting protrusions 68 ₁ and 68 ₂ are fitted into the fitting grooves 54 a ₂ and 54 a ₁ of the connecting member 50, so that the annular groove 14 and the pipe joint of the branch connection portion 12 are fitted. 20 annular grooves 24 can be accommodated in the accommodating portion 62, and at the same time, the flange 16 of the branch connecting portion 12 and the flange 23 of the pipe joint 20 are formed in the guide grooves 66 formed in the inner peripheral surfaces 65 ₁ and 65 _{2. 1} and 66 ₂ can be accommodated.

In this case, the circumferential lengths of the cylindrical surfaces 53 ₁ and 53 ₂ constituting the inner peripheral surfaces 55 ₁ and 55 ₂ of the accommodating portion 52 in the connecting member 50 and the inner peripheral surfaces 65 ₁ and 65 of the accommodating portion 62 in the cap 60. ₂ (the cylindrical surfaces 63 ₁ , 63 ₂ ) is set to 90% of the circumferential length of the annular groove 14 of the branch connection portion 12 and the annular groove 24 of the pipe joint 20.

  In this way, by connecting the branch connection portion 12 of the header 10 and the pipe joint 20 using the connection member 50 and the cap 60, the connection member 50 and the cap with respect to the flange 16 of the branch connection portion 12 and the flange 23 of the pipe joint 20. The contact area of 60 can be further increased. Therefore, when the branch connection portion 12 tries to deform and expand due to hot water supply or the like, and the connection member 50 receives a force to expand the opening 51, the pulling force acting in the axial direction of the branch connection portion 12 and the above-described force. A frictional force is generated by the product of the contact area and the opening of the connecting member 50 can be restricted. In this case, since the contact area is greatly increased as compared with the case where only the connecting member 50 is used, a larger frictional force can be generated, and the opening of the connecting member 50 can be regulated by the larger frictional force. .

  Further, FIG. 13 shows another embodiment of the connection structure of the header and pipe joint of the present invention.

  In this embodiment, a reinforcing ring 70 formed in a ring shape from a metal plate material such as a stainless steel plate is disposed on the outer peripheral surface of the flange 16 formed on the opening end side of the branch connection portion 12 in the header 10. Yes.

  Thereby, the branch connection part 12 in the header 10 can be reliably prevented from being softened by hot water supply or the like and trying to deform and expand.

  The reinforcement ring 70 is preferably disposed on the header using insert molding when the header 10 is injection molded. Thereby, shrinkage deformation after molding or after cross-linking treatment can be prevented, and dimensional stability important for sealing performance can be obtained.

  As described above, the reinforcing ring 70 is disposed on the outer peripheral surface of the flange 16 formed on the opening end side of the branch connection portion 12, while the pipe joint 20 is connected to the branch connection portion 12. When the flange 16 is single, the pipe joint 20 is connected by the connecting member 30 or the connecting member 30 and the cap 40, and when the flange 16 is plural, the connecting member 50 or the connecting member 50 and the cap 60 are connected. By connecting, the strength can be further increased and the connection can be made more firmly.

  In addition to the ring shape described above, the shape of the reinforcing ring 70 described above is a reinforcement having an L-shaped cross section so as to cover the outer peripheral surface of the flange 16 formed on the opening end side of the branch connection portion 12 and the opening end surface thereof. The ring 71 (see FIG. 14 (a)), the outer peripheral surface of the flange 16 formed on the opening end side of the branch connection portion 12, the opening end surface thereof, and guidance for inserting the insertion portion 21 of the pipe joint 20 are provided. The reinforcing ring 72 (see FIG. 14B) having a substantially U-shaped cross section may be formed so as to cover the tapered surface formed at the inner circumferential surface side opening end of the branch connection portion 12.

  By employing such a reinforcing ring 71 having an L-shaped cross section or a reinforcing ring 72 having a substantially U-shaped cross section, the strength can be increased as compared with the annular reinforcing ring 70, and the branch connection portion 12 can be provided. It is possible to prevent the separation from the vehicle more reliably.

  Further, FIG. 15 and FIG. 16 show another embodiment of the connection structure between the header and the pipe joint of the present invention.

  The connection structure of this embodiment includes a header 10 made of synthetic resin, a pipe joint 20 that can be connected to the header 10, a cylinder 80 that can be connected to the pipe joint 20, and a pipe joint 20 that connects the cylinder 80 to the header. 10, a connecting member 90 made of a synthetic resin that connects the header 10 and the cylinder 80 when connected to the connector 10.

  The header 10 includes a header main body 11 and a plurality of branch connection portions 12 protruding from the outer peripheral surface of the header main body portion 11 in the same manner as the header of the above-described embodiment. A connecting portion 17 is formed at the opening end portion thereof, and a flange 18 is formed continuously with the connecting portion 17 (see FIG. 17).

  In this case as well, the header 10 is molded from vinyl chloride, polybutene, cross-linked polyethylene, or the like, in addition to engineering plastic having high strength at high temperatures.

  The pipe joint 20 has a slot 21 that can be inserted into the connecting portion 17 of the branch connection portion 12, and a pipe attachment portion 22 that can attach a branch pipe (not shown) to the other end. A flange 25 having an outer diameter substantially the same as an outer diameter of a body portion 81 of a cylinder body 80, which will be described later, is formed at an intermediate portion, and an engaging claw 83 of the cylinder body 80 is adjacent to the insertion port side of the flange 25. An engaging groove 26 that can be engaged is formed, and is made of brass, bronze, a composite structure of these metals and a synthetic resin, a synthetic resin, or the like.

  As shown in FIG. 18, the cylindrical body 80 has an outer diameter substantially corresponding to the inner diameter corresponding to the outer diameter of the connecting portion 17 of the branch connecting portion 12 and the outer diameter of the flange 25 formed in the intermediate portion of the pipe joint 20. A body portion 81 having a diameter and a flange 82 having the same outer diameter as that of the flange 18 formed at the opening end portion of the branch connection portion 12 are integrally formed at one end portion of the body portion 81. It has a length between the front end surface of the flange 18 of the branch connection portion 12 and the front end surface of the flange 25 of the pipe joint 20 when the insertion portion 21 of the pipe joint 20 is inserted into the connecting portion 17. . The other end of the main body 81 of the cylinder 80 is engaged with an engagement groove 26 formed adjacent to the insertion port side of the flange 25 of the pipe joint 20 over the inner peripheral surface thereof. A claw 83 is formed.

  As shown in FIG. 19, the connecting member 90 has a slightly smaller width than the outer diameter of the cylindrical portion adjacent to the proximal end side of the flange 18 of the branch connection portion 12 and the outer diameter of the main body portion 81 of the cylindrical body 80. And an accommodating portion 92 capable of accommodating the cylindrical portion adjacent to the proximal end side of the flange 18 of the branch connection portion 12 and the main body portion 81 of the cylindrical body 80 at the inner back portion. It is formed in a substantially U shape.

The accommodating portion 92 of the connecting member 90 includes a cylindrical surface 93 _{1 having} an inner diameter corresponding to the outer diameter of the cylindrical portion adjacent to the proximal end of the flange 18 of the branch connection portion 12 and the cylindrical surface 93 _1. An inner peripheral surface 95 ₁ composed of a pair of continuous planes 94 ₁ and 94 ₁ is formed on one end side in the axial direction. Furthermore, the accommodating portion 92 of the connecting member 90 has a dominant arc-shaped cylindrical surface 93 _{2 having} an inner diameter corresponding to the outer diameter of the main body portion 81 of the cylindrical body 80 and a pair of flat surfaces 94 ₂ , continuous with the cylindrical surface 93 ₂ , respectively. the inner peripheral surface 95 ₂ is formed is positioned on the other end side of the axial direction consisting of 94 _2.

Further, between the adjacent inner peripheral surfaces 95 ₁ and 95 ₂ of the accommodating portion 92 in the connecting member 90, a width substantially equivalent to the thickness when the flange 18 of the branch connection portion 12 and the flange 82 of the cylindrical body 80 are abutted with each other. , the inner diameter of the guide groove 96 corresponding to the outer diameter of the flange 18,82 is the inner circumferential surface 95 _1, 95 ₂ of the cylindrical surfaces 93 _1, 93 ₂ and a pair of plane 94 _1, 94 _1, 94 _2, 94 ₂ Corresponding to the entire circumference.

Here, the inner circumferential surface 95 _1, 95 cylindrical surface 93 _1, 93 ₂ of the circumferential length constituting ₂ of the housing portion 92 in the connecting member 90, adjacent the proximal side of the flange 18 of the branch connection portion 12 It is set to 67% of the circumferential length of the cylindrical portion and the circumferential length of the main body portion 81 of the cylindrical body 80. Similarly, the cylindrical surfaces 93 ₁ and 93 ₂ of the inner circumferential surfaces 95 ₁ and 95 ₂ are set. The circumferential length of the arcuate cylindrical surface of the guide groove 96 corresponding to is also 67% of the circumferential length of the flanges 18 and 82.

  As described above, as the synthetic resin for forming the connecting member 90, when heat resistance is required, engineering plastics such as polyacetal, polyether sulfone, polyphenylene sulfide, polysulfone, and polyphenylene sulfone are used. On the other hand, when heat resistance is not required, general-purpose resins such as vinyl chloride, polybutene, cross-linked polyethylene, and polyethylene can be employed.

  Next, the case where the pipe joint 20 is connected to the branch connection portion 12 and connected will be described with reference to FIG.

  First, the main body portion 81 of the cylinder body 80 is fitted into the insertion portion 21 of the pipe joint 20, and the engagement claw 83 of the main body portion 81 is pushed in, so that it is formed adjacent to the insertion portion side of the flange 25 of the pipe joint 20. The engagement grooves 26 are forcibly fitted and integrally connected.

Next, the insertion end 21 of the pipe joint 20 is inserted into the opening end portion of the branch connection portion 12 so that the tube portion 20 is positioned on the inner peripheral side, and the flanges 18 and 82 are abutted against each other. The Thereafter, the opening 91 of the connecting member 90 is made to face the cylindrical portion adjacent to the proximal end side of the flange 18 of the branch connection portion 12 and the body portion 81 of the cylindrical body 80, and the distal end of the guide groove 96 It fits in the diameter direction orthogonal to the axial direction of the branch connection part 12 according to the flanges 18 and 82 which faced each part. As a result, the connecting member 90 has a distance corresponding to the outer diameter of the cylindrical portion adjacent to the proximal end side of the flange 18 of the branch connection portion 12 and the outer diameter of the main body portion 81 of the cylindrical body 80. It can be elastically deformed and expanded, and can be accommodated in the accommodating portion 52 over the cylindrical portion adjacent to the proximal end side of the flange 18 of the branch connecting portion 12 and the outer peripheral surface of the main body portion 81 of the cylindrical body 80. At this time, the flange 18 of the branch connection portion 12 and the flange 82 of the cylindrical body 80 are also accommodated in the guide groove 96 formed in the inner peripheral surfaces 95 ₁ and 95 ₂ .

In this case, the cylindrical surface 93 ₁ is adapted to contact 67% of the outer peripheral surface of the cylindrical portion adjacent the proximal end side of the flange 18 of the branch connection portion 12, the cylindrical surface _{93. 2,} the main body portion 81 of the cylindrical body 80 Similarly, 67% of the outer peripheral surfaces of the flanges 18 and 82 are in contact with the arcuate cylindrical surface portion of the guide groove 96 formed in the cylindrical surfaces 93 ₁ and 93 ₂ . .

  As a result, the pipe joint 20 connected via the branch connection portion 12 and the cylinder 80 is connected by covering the flange 18 of the branch connection portion 12 and the flange 82 of the cylinder body 80 with the connecting member 90 made of synthetic resin. Therefore, the problem of strength and the problem of the contact area between the flanges 18 and 82 and the connecting member 80 can also be solved. That is, since the connecting member 80 is configured to cover the flange 18 of the branch connection portion 12 and the flange 82 of the cylindrical body 80 connected to the pipe joint 20, it is assumed that a pulling force is applied to the pipe joint 20 due to a water hammer phenomenon or the like. In addition, the pulling force can be uniformly distributed and supported by the contact areas of the flange 18 of the branch connection portion 12 and the flange 82 of the cylindrical body 80 with respect to the connecting member 80, and the strength can be improved and the strength against the flanges 18 and 82 can be improved. Concentration of load can also be suppressed. Further, by employing the synthetic resin connecting member 90, the thickness can be sufficiently increased without increasing the weight, and the strength can be ensured without impairing the workability.

  In addition, since the cylindrical body 80 covers the opening end portion of the branch connection portion 12, expansion of the opening end portion can be suppressed, and occurrence of water leakage due to expansion deformation can be reliably prevented. Therefore, even if the header is formed of a general-purpose resin such as cross-linked polyethylene, it is possible to reliably prevent the expansion deformation without taking any special preventive measures, and to prevent water leakage due to the expansion deformation.

It is a half sectional view showing one embodiment of the connection structure of the header and pipe joint of the present invention. It is a perspective view of the header and pipe joint which comprise the connection structure of FIG. It is a perspective view which shows the connection member which comprises the connection structure of FIG. It is explanatory drawing which shows the process of connecting the branch connection part and header of a header using the connection member of FIG. It is a perspective view which shows the cap connectable with the connection member of FIG. 3 with a connection member. It is explanatory drawing which shows the process of connecting the branch connection part and header of a header with a connection member and a cap. It is a half sectional view showing other embodiments of the connection structure of the header and pipe joint of the present invention. It is a perspective view which shows the header in the connection structure of FIG. It is the front view which shows the connection member which comprises the connection structure of FIG. 7, and its AA sectional view. It is explanatory drawing which shows the process of connecting the branch connection part and pipe joint of a header using the header of FIG. 8, and the connection member of FIG. It is a front view which shows the cap connectable with the connection member of FIG. 9 with a connection member. FIG. 12 is a cross-sectional view of the connecting member and cap of FIG. 11 taken along the line BB. It is a perspective view which shows the reinforcement ring arrange | positioned by the branch connection part of a header with a header. It is a perspective view which shows the modification of a reinforcement ring. FIG. 6 is a half sectional view showing another embodiment of a connection structure between a header and a pipe joint according to the present invention, partially omitted. It is a perspective view which shows the connection structure of FIG. FIG. 16 is a perspective view, a side view, and a cross-sectional view taken along the line CC of FIG. It is a perspective view which shows the cylinder which comprises the connection structure of FIG. 15, a side view, and its DD sectional view. It is the perspective view which shows the connection member which comprises the connection structure of FIG. 15, a side view, its EE sectional view, and the FF sectional view.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Header 11 Header main-body part 12 Branch connection part 13,14 Annular groove | channel 15,16,18 Flange 20 Pipe joint 21 Outlet part 22 Pipe attachment part 23,25 Flange 24 Annular groove 30,50,90 Connecting member 31,51, 91 opening 32,52,92 housing portion 33, 53 _1, 53 _2, 93 _1, 93 ₂ cylindrical surfaces 34, 54 _1, 54 _2, 94 _1, 94 ₂ plane 35, 55 _1, 55 _2, 95 _1, 95 ₂ circumferential surfaces 36, 56 ₁ , 56 ₂ , 96 ₁ , 96 ₂ guide grooves 34a, 54a ₁ , 54a ₂ fitting grooves (fitting portions)
40, 60 Cap 41, 61 Opening 42, 62 Housing part 43, 63 ₁ , 63 ₂ Cylindrical surface 45, 65 ₁ , 65 ₂ Circumferential surface 46, 66 ₁ , 66 ₂ Guide groove 47, 67 ₁ , 67 ₂ Guide protrusion Thread 68 ₁ , 68 ₂ mating ridge (part to be mated)
70, 71, 72 Reinforcement ring 80 Tube 81 Body 82 Flange

Claims (9)

  A header main body in which an annular groove and a flange by the annular groove are formed at the opening end, and a branch connection portion that protrudes from the outer peripheral surface of the header main body and has an annular groove and a flange by the annular groove at the opening end. A synthetic resin header, an insertion port that can be inserted into the branch connection part of the header at one end, and a pipe attachment part that can connect a branch pipe to the other end, and a branch connection part at the middle part A flange that can be abutted with the flange, a pipe joint that is located on the back side of the flange and has an annular groove formed thereon, and a branch connection part where the flanges are abutted with each other and a coupling member that couples the pipe joint, The connecting member has an opening corresponding to the outer diameter of the annular groove of the branch connection portion and the outer diameter of the annular groove of the pipe joint at the tip, and the opening end portion of the branch connection portion and the inner deep portion. It has an accommodating part that can accommodate the intermediate part of the pipe joint and is formed in a substantially U shape. The accommodating part has an inner diameter corresponding to the outer diameter of the annular groove of the branch connection part and the outer diameter of the annular groove of the pipe joint. A substantially semicircular cylindrical surface and an inner peripheral surface comprising a pair of planes continuous to the cylindrical surface, and the inner peripheral surface includes a flange of a branch connection portion and a flange of a pipe joint A guide groove with a width corresponding to the thickness of each and an inner diameter corresponding to the outer diameter of those flanges is formed over the entire circumference, and an insertion opening is inserted into the branch connection portion of the header, and the flanges are abutted and connected. A connecting structure between a header and a pipe joint, wherein the receiving part of the connecting member is fitted into and connected to the branch connection part and the pipe joint through the opening.   2. A connection structure between a header and a pipe joint according to claim 1, wherein a plurality of annular grooves and a plurality of flanges by the plurality of annular grooves are formed at an opening end portion of the branch connection portion at intervals in the axial direction, and a connecting member is formed. A plurality of substantially semicircular cylindrical surfaces corresponding to the plurality of annular grooves of the branch connection portion, and an inner peripheral surface formed of a pair of opposing flat surfaces respectively continuous with the cylindrical surface, A connection structure between a header and a pipe joint, wherein a plurality of guide grooves corresponding to a plurality of flanges are formed on the surface.   3. The connection structure between the header and the pipe joint according to claim 1, wherein the cylindrical surface of the coupling member has circumferential lengths on the outer peripheral surface of the annular groove of the branch connection portion and the outer peripheral surface of the annular groove of the pipe joint. The connection structure between the header and the pipe joint is characterized by being in contact with 55% or more.   The connection structure between the header and the pipe joint according to any one of claims 1 to 3, wherein a fitting portion is formed in the vicinity of a front end of a plane that constitutes an inner peripheral surface of the housing portion in the coupling member. A connection structure between a header and a pipe joint, characterized by   5. A connection structure between a header and a pipe joint according to claim 4, wherein a cap for closing the opening of the connecting member is provided, and the cap has an outer diameter of the annular groove of the branch connection portion and an annular groove of the pipe joint at the tip. It has an opening with a width substantially corresponding to the outer diameter, and has an accommodating portion capable of accommodating the opening end of the branch connection portion and the intermediate portion of the pipe joint in the inner back portion, and is formed in a substantially C-shape. The inner peripheral surface is formed of a substantially semicircular cylindrical surface having an inner diameter corresponding to the outer diameter of the annular groove of the branch connection portion and the outer diameter of the annular groove of the pipe joint. A guide groove having a width corresponding to the thickness of the flange of the joined branch connection and the flange of the pipe joint and an inner diameter corresponding to the outer diameter of those flanges is formed over the entire circumference, and is further connected to the outer surface of each tip. Flat surface that can overlap with the flat surface that forms the inner peripheral surface of the member And a guide protrusion that can be fitted into the guide groove, and a fitting portion that can be fitted into the fitting portion of the connecting member is formed. Connection structure.   The connection structure between a header and a pipe joint according to claim 1 or 5, wherein a reinforcing ring is disposed on the outer peripheral surface of the opening end side flange of the branch connection portion of the header. Connection structure.   The connection structure between a header and a pipe joint according to claim 6, wherein the reinforcing ring is disposed by insert molding.   A header made of a synthetic resin, which consists of a header body part and a branch connection part protruding from the outer peripheral surface of the header body part and having a connection part and a flange formed at the opening end part, and a connection part of the branch connection part at one end part And a pipe joint having a pipe mounting part capable of connecting a branch pipe to the other end, and an inner diameter corresponding to the outer diameter of the connecting part of the branch connection part. A main body part connectable to the insertion port part, a cylindrical body integrally formed with a flange that can be abutted with a flange of the branch connection part at one end part of the main body part, an insertion port part of the pipe joint, and an insertion port of the pipe joint The cylindrical body connected to the part is inserted into the connecting part of the branch connecting part, and is composed of a branch connecting part in which the flanges are abutted with each other and a connecting member that connects the cylindrical body, and the connecting member is branched at the tip Base end of flange A cylindrical portion having an opening corresponding to the outer diameter of the adjacent cylindrical portion and the outer diameter of the main body portion of the cylindrical body, and the cylindrical portion adjacent to the proximal end side of the flange of the branch connection portion and the main body portion of the cylindrical body Is formed in a substantially U-shape, and the accommodating portion includes an outer diameter of the cylindrical portion adjacent to the proximal end side of the flange of the branch connection portion and an outer diameter of the main body portion of the cylindrical body. And an inner peripheral surface comprising a pair of planes continuous to the cylindrical surface, and a flange and a cylindrical body of the butted branch connection portion are formed on the inner peripheral surface. A guide groove having a width corresponding to the thickness of the flanges and an inner diameter corresponding to the outer diameter of the flanges is formed over the entire circumference, and a tube body connected to the inlet portion of the pipe joint and the inlet portion of the pipe joint is formed. Inserted into the connecting part of the branch connection part, the flange of the branch connection part and Body flange are matched, the connection structure between the header and pipe fittings, characterized in that connected to these branch connection portion and the tubular body, is fitted a housing portion of the connecting member through the opening.   9. The connection structure between a header and a pipe joint according to claim 8, wherein an engaging groove is formed adjacent to the flange opening side in the intermediate part of the pipe joint, while the other end of the main body part of the cylindrical body A connection structure between a header and a pipe joint, wherein an engagement claw capable of engaging with an engagement groove of the pipe joint is formed on a side inner peripheral surface.

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