JP2011220442A - Pipe fitting and piping structure having the pipe fitting - Google Patents

Abstract

PROBLEM TO BE SOLVED: To sufficiently lock all pipes, when connecting different type of pipes, in a pipe joint having a lock ring.SOLUTION: The pipe joint includes a first socket 10 for inserting a first pipe, a second socket 20 for inserting a second pipe and a joint body 5 having a flow passage 6 formed thereon for communicating the first socket 10 with the second socket 20. The first socket 10 includes a first inner cylinder 11 and a first outer cylinder 12 for surrounding the periphery of the first inner cylinder 11, and is constituted so as to sandwich the first pipe between the first inner cylinder 11 and the first outer cylinder 12. The second socket 20 includes a second inner cylinder 21 and a second outer cylinder 22 for surrounding the periphery of the second inner cylinder 21, and is constituted so as to sandwich the second pipe between the second inner cylinder 21 and the second outer cylinder 22. A first lock ring 13 is arranged on an outer peripheral surface of the first inner cylinder 11, and a second lock ring 23 is arranged on an inner peripheral surface of the second outer cylinder 22.

Description

  The present invention relates to a pipe joint and a piping structure provided with the pipe joint.

  Conventionally, a pipe joint provided with a lock ring that prevents a connected pipe from coming off is known (for example, see Patent Document 1). FIG. 12 shows an example of a conventional pipe joint provided with a lock ring. The pipe joint 100 includes an inner cylinder 102, an outer cylinder 103 surrounding the inner cylinder 102, and a lock ring 104 provided on the inner peripheral surface of the outer cylinder 103.

  When the pipe 110 is inserted into the pipe joint 100, the pipe 110 fits between the inner cylinder 102 and the outer cylinder 103 and enters the inner part of the pipe joint 100 beyond the lock ring 104. When a pulling force acts on the tube 110, the outer peripheral surface of the tube 110 is caught on the claw 104 a of the lock ring 104. Since the movement of the lock ring 104 in the axial direction is restricted, the movement of the tube 110 in the axial direction is also restricted. Therefore, the tube 110 is locked by the lock ring 104. Therefore, even if a tensile force acts on the pipe 110, the pipe 110 is prevented from coming off from the pipe joint 100.

  Thus, according to the pipe joint 100 provided with the lock ring 104, the pipe 110 can be connected and locked by a simple operation of simply inserting the pipe 110 into the pipe joint 100. Therefore, the connection work of the pipe | tube 110 becomes easy.

JP 2010-054020 A

  By the way, there are various forms of piping structures, and there are cases where it is desired to connect different types of pipes using a pipe joint provided with a lock ring. For example, there is a case where it is desired to connect a resin single-layer pipe (hereinafter referred to as a resin pipe) and a three-layer pipe having a metal reinforcing layer using a pipe joint provided with a lock ring. However, in such a case, there are the following problems.

  That is, even if the resin pipe and the three-layer pipe have the same nominal diameter, their actual inner diameter and outer diameter are often different from each other. In general, in the resin pipe, the outer diameter dimension is as designed, but the inner diameter dimension often includes a slight error. Conversely, in a three-layer tube, the inner diameter dimension is as designed, but the outer diameter dimension often includes some error. In the pipe joint 100 described above, the lock ring 104 is provided on the inner peripheral surface of the outer cylinder 103. Therefore, when connecting a resin pipe and a three-layer pipe using the pipe joint 100, a resin pipe having an accurate outer diameter is properly held by the lock ring 104, but a three-layer pipe having an incorrect outer diameter is used. May not be properly gripped by the lock ring 104.

  As described above, in the conventional pipe joint, when connecting different types of pipes, there is a possibility that any of the pipes cannot be sufficiently locked by the lock ring.

  The present invention has been made in view of such a point, and an object of the present invention is to sufficiently lock all pipes when connecting pipes of different types in a pipe joint provided with a lock ring. There is to do.

  The pipe joint according to the present invention includes a first receiving port into which a first pipe is inserted, a second receiving port into which a second pipe is inserted, the first receiving port and the second receiving port. A pipe joint having a flow passage communicating with the mouth, wherein the first receiving port surrounds the first inner cylinder and the first inner cylinder. A first outer cylinder, and is configured to sandwich the first pipe between the first inner cylinder and the first outer cylinder. An inner cylinder and a second outer cylinder surrounding the second inner cylinder, and the second pipe is sandwiched between the second inner cylinder and the second outer cylinder A first lock ring provided on the outer peripheral surface of the first inner cylinder, and a second lock ring provided on the inner peripheral surface of the second outer cylinder. It is.

  According to the pipe joint, the lock ring is provided on the outer peripheral surface of the inner cylinder at the first receiving port, while the lock ring is provided on the inner peripheral surface of the outer cylinder at the second receiving port. Therefore, the first and second pipes are connected by connecting the first pipe having an accurate inner diameter dimension to the first receiving port and connecting the second pipe having an accurate outer diameter dimension to the second receiving port. Both of them can be sufficiently locked by the lock ring.

  The first lock ring is located between the root portion located on the joint body side, a tip portion located on the opposite side of the joint body, and between the root portion and the tip portion, and is radially outward. And a claw is formed on the outer side in the radial direction of each of the distal end portion and the curved portion, and the second lock ring is a root located on the joint body side. A distal end portion located on the opposite side of the joint body, a curved portion convex between the root portion and the distal end portion and projecting radially inward. And the nail | claw may be formed in the radial inside of the said curved part, respectively.

  In each of the lock rings, claws are formed not only at the tip but also at the curved portion. However, since the bending portion is easily bent, the nail moves radially outward or inward so as to escape from the tube when the tube is inserted. Therefore, the nail does not disturb the tube insertion. On the other hand, when a pulling force is applied to the tube, both the claw of the distal end portion and the bending portion grip the tube. Therefore, the tube is securely locked by the lock ring.

  It is preferable that a seal ring is provided on the outer peripheral surface of the first inner cylinder.

  As a result, when the first tube having an accurate inner diameter dimension is connected to the first receiving port, the first tube can be sealed from the inside. Therefore, it is possible to satisfactorily seal between the first pipe and the pipe joint. In addition, since sealing is performed between the inner peripheral surface of the pipe and the outer peripheral surface of the inner cylinder, even if the outer cylinder is damaged, the fluid is less likely to leak to the outside. In addition, when a multilayer pipe having a metal reinforcing layer is used as a pipe connected to the pipe joint, it is possible to prevent the metal reinforcing layer from being exposed to a fluid at the end face of the multilayer pipe. Therefore, corrosion of the metal reinforcing layer can be suppressed.

  It is preferable that a seal ring is provided on the inner peripheral surface of the second outer cylinder.

  As a result, when the second tube having an accurate outer diameter is connected to the second receiving port, the second tube can be sealed from the outside. Therefore, it is possible to satisfactorily seal between the second pipe and the pipe joint.

  The first outer cylinder and the second outer cylinder may have different inner diameters. Further, the first inner cylinder and the second inner cylinder may have different outer diameters.

  Thus, even when the outer diameter or inner diameter of the first tube and the second tube are relatively different, both the tubes can be connected well.

  The piping structure according to the present invention includes the pipe joint, a first pipe connected to a first receiving port of the pipe joint, and a second pipe connected to a second receiving port of the pipe joint. , Wherein the first pipe and the second pipe are of different types.

  The first tube and the second tube may have different inner diameters or outer diameters.

  According to the present invention, in a pipe joint provided with a lock ring, all pipes can be sufficiently locked when connecting different kinds of pipes.

It is a front view of the piping structure concerning a 1st embodiment. It is a longitudinal cross-sectional view of a socket. The 1st lock ring is represented, (a) is a perspective view, (b) is a side view, (c) is a longitudinal cross-sectional view. The 2nd lock ring is represented, (a) is a perspective view, (b) is a side view, (c) is a longitudinal cross-sectional view. It is a front view of the piping structure concerning a 2nd embodiment. It is a longitudinal cross-sectional view of an elbow. It is a front view of the piping structure concerning a 3rd embodiment. It is a longitudinal cross-sectional view of cheese. It is a longitudinal cross-sectional view of the cheese which concerns on a modification. It is a longitudinal cross-sectional view of the cheese which concerns on another modification. It is a longitudinal cross-sectional view of the cheese which concerns on another modification. It is a longitudinal cross-sectional view of the conventional pipe joint.

(First embodiment)
As shown in FIG. 1, the pipe joint which concerns on 1st Embodiment is the socket 51, and is a pipe joint which connects two pipes straightly. The socket 51 includes a first receiving port 10 into which the first tube 1 is inserted, a second receiving port 20 into which the second tube 2 is inserted, and the joint body 5. In the present embodiment, the pipe 1, the pipe 2, and the socket 51 constitute a piping structure that extends straight.

  The types of the pipe 1 and the pipe 2 are different from each other. The tube 1 is a tube having a more accurate inner diameter than an outer diameter. In other words, the tube 1 is a type of tube in which errors between actual dimensions and design values are more likely to occur at the outer diameter than at the inner diameter. On the other hand, the tube 2 is a tube having a more accurate outer diameter than an inner diameter. Therefore, the tube 1 and the tube 2 often have slightly different inner diameters or outer diameters.

  In the present embodiment, the tube 1 is a three-layer tube having a metal reinforcing layer. Specifically, the tube 1 is a three-layer tube having an inner layer made of crosslinked polyethylene, an intermediate layer made of aluminum, and an outer layer made of crosslinked polyethylene. However, the material of each layer is not limited at all. For example, the inner layer and the outer layer are not limited to polyethylene, and may be made of other resin materials such as polypropylene, or may be made of other materials. The intermediate layer may be made of other metal materials such as iron, copper, and stainless steel, and may be formed of other materials. The pipe 2 is a single-layer pipe made of resin. The pipe 2 is, for example, a crosslinked polyethylene pipe, a polybutene pipe, a polyethylene pipe, a polypropylene pipe, or the like.

  As shown in FIG. 2, the receiving port 10 has an inner cylinder 11 and an outer cylinder 12 surrounding the inner cylinder 11. A first lock ring 13 is provided on the outer peripheral surface of the inner cylinder 11. Specifically, a concave portion 11a that is recessed inward in the radial direction is formed in the central portion of the inner cylinder 11 in the axial direction (left-right direction in FIG. 2). The lock ring 13 is provided in the recess 11a. A tapered surface 11c is formed on the distal end side of the recess 11a, that is, on the right side in FIG. On the left and right sides of the recess 11a, other recesses 11b are formed. A seal ring 14 made of an O-ring is fitted in these recesses 11b. The front end side of the inner cylinder 11 is formed in a divergent shape. In other words, the tip side of the inner cylinder 11 is formed in a funnel shape. Thereby, peeling of the fluid between the pipe | tube 1 and the inner cylinder 11 can be suppressed, and the flow of the fluid can be smoothed. For example, the flow velocity of the fluid flowing through the inner cylinder 11 can be increased. Therefore, even if the inner diameter of the inner cylinder 11 is small, a sufficient flow rate can be ensured. The distal end of the inner cylinder 11 is located closer to the root side than the distal end of the outer cylinder 12. That is, the inner cylinder 11 enters the inner side of the outer cylinder 12 in the axial direction. Thereby, damage of the inner cylinder 11 resulting from the bending stress of the pipe 1 can be prevented. Moreover, it is possible to prevent the inner cylinder 11 from being damaged when the socket 51 is accidentally dropped.

  The receiving port 20 has an inner cylinder 21 and an outer cylinder 22 surrounding the inner cylinder 21. A second lock ring 23 is provided on the inner peripheral surface of the outer cylinder 22. Specifically, the outer cylinder 22 has a recess 22a that is recessed outward in the radial direction. The lock ring 23 is provided in the recess 22a. A tapered surface 22c is formed on the distal end side of the recess 22a, that is, on the left side in FIG. A recess 22b is formed on the inner peripheral surface of the outer cylinder 22 on the root side of the recess 22a, that is, on the right side in FIG. A seal ring 24 made of an O-ring is fitted in the recess 22b. Similar to the inner cylinder 11, the front end side of the inner cylinder 21 is also formed in a divergent shape. The inner cylinder 21 also enters the inner side of the outer cylinder 22 in the axial direction.

  The joint body 5 is formed with a flow path 6 that allows the receiving port 10 and the receiving port 20 to communicate with each other. Specifically, the flow path 6 communicates the inside of the inner cylinder 11 and the inside of the inner cylinder 21. The joint body 5 partitions a space between the inner tube 11 and the outer tube 12 of the receiving port 10 and a space between the inner tube 21 and the outer tube 22 of the receiving port 20. In the present embodiment, the joint body 5, the inner cylinder 11, and the inner cylinder 21 are integrated. In other words, the joint main body 5, the inner cylinder 11, and the inner cylinder 21 are an integrated object. However, the joint body 5, the inner cylinder 11, and the inner cylinder 21 may be separate from each other. In the present embodiment, the joint body 5, the outer cylinder 12, and the outer cylinder 22 are separate from each other, and the outer cylinder 12 and the outer cylinder 22 are fitted into the joint body 5 so as not to slide. However, the outer cylinder 12 and the outer cylinder 22 may be slidably attached to the joint body 5 so as to be rotatable around the axis.

  The inner cylinder 11, the outer cylinder 12, the inner cylinder 21, the outer cylinder 22, and the joint body 5 are injection-molded with PPS (polyphenylene sulfide). However, these materials are not limited to PPS, and may be other engineering plastics, metals, or other materials. Moreover, the molding method of the inner cylinder 11, the outer cylinder 12, the inner cylinder 21, the outer cylinder 22, and the joint body 5 is not limited to injection molding.

  Next, the lock ring 13 and the lock ring 23 will be described. 3A, 3B, and 3C are a perspective view, a side view, and a longitudinal sectional view of the lock ring 13, respectively. The lock ring 13 has a root portion 13a, a tip portion 13b, and a curved portion 13c located between the root portion 13a and the tip portion 13b. As shown in FIG. 3C, the bending portion 13c is curved in a convex shape toward the outer side in the radial direction. The tip 13b is provided with a claw 13d, and the bending portion 13c is provided with a claw 13e. The claw 13d and the claw 13e protrude outward in the radial direction and toward the root side in order to restrict the tube 1 from coming out of the receiving port 10.

  As shown in FIGS. 3A and 3B, the lock ring 13 is formed with a slit 13f extending from the root portion 13a to the curved portion 13c and a slit 13g extending from a part of the curved portion 13c to the distal end portion 13b. Has been. A plurality of the slits 13f and the slits 13g are arranged in the circumferential direction. Here, eight slits 13f are arranged every 45 degrees. Eight slits 13g are arranged every 45 degrees. The slit 13f and the slit 13g are formed at positions shifted from each other in the circumferential direction. Here, the centers of the slit 13f and the slit 13g are shifted by 22.5 degrees. A slit 13f and a slit 13g are both formed in a part of the bending portion 13c. Therefore, the bending portion 13c is easily bent.

  4A, 4B, and 4C are a perspective view, a side view, and a longitudinal sectional view of the lock ring 23, respectively. The lock ring 23 includes a root portion 23a, a tip portion 23b, and a curved portion 23c positioned between the root portion 23a and the tip portion 23b. As shown in FIG. 4C, the curved portion 23c is curved in a convex shape toward the inner side in the radial direction. The tip 23b is provided with a claw 23d, and the curved portion 23c is provided with a claw 23e. The claw 23d and the claw 23e protrude radially inward and toward the root side in order to restrict the tube 2 from coming out of the receiving port 20.

  As shown in FIGS. 4A and 4B, the lock ring 23 is formed with a slit 23f extending from the root portion 23a to the curved portion 23c and a slit 23g extending from a part of the curved portion 23c to the distal end portion 23b. Has been. A plurality of the slits 23f and the slits 23g are arranged in the circumferential direction. Here, eight slits 23f are arranged every 45 degrees. Eight slits 23g are arranged every 45 degrees. The slit 23f and the slit 23g are formed at positions shifted from each other in the circumferential direction. Here, the centers of the slit 23f and the slit 23g are shifted by 22.5 degrees. A slit 23f and a slit 23g are both formed in a part of the bending portion 23c. Therefore, the bending portion 23c is easily bent.

  The lock rings 13 and 23 are formed of PPSU (polyphenylsulfone). The lock rings 13 and 23 of this embodiment are injection molded. However, the material and molding method of the lock rings 13 and 23 are not limited at all. The material of the lock rings 13 and 23 may be an engineering plastic other than PPSU, such as PPS, or other materials. The material and molding method of the lock rings 13 and 23 may be the same or different from each other.

  When the pipe 1 and the pipe 2 are connected using the socket 51, the pipe 1 is inserted into the receiving port 10 from the right side in FIG. 2, and the pipe 2 is inserted into the receiving port 20 from the left side. The pipe 1 is fitted between the inner cylinder 11 and the outer cylinder 12 of the receiving port 10, and the pipe 2 is fitted between the inner cylinder 21 and the outer cylinder 22 of the receiving port 20. The lock ring 13 is formed with not only the claw 13d but also the claw 13e, and the lock ring 23 is formed with not only the claw 23d but also the claw 23e. The claw 13e and 23e are formed on the curved portions 13c and 23c, respectively. ing. The curved portions 13c and 23c are easily deformable. Therefore, when the tube 1 is inserted, the bending portion 13c is deformed, and the claw 13e moves inward in the radial direction. Further, when the tube 2 is inserted, the curved portion 23c is deformed, and the claw 23e moves outward in the radial direction. Therefore, although the claws 13e and 23e are provided, the tubes 1 and 2 can be easily inserted. On the other hand, after the tubes 1 and 2 are inserted, the claw 13e bites into the inner peripheral surface of the tube 1 and the claw 23e bites into the outer peripheral surface of the tube 2 by the repulsive force of the bending portions 13c and 23c.

  When a pulling force in the right direction acts on the tube 1, the tube 1 moves slightly to the right. Then, the lock ring 13 is pulled slightly to the right by the tube 1. However, since the inner cylinder 11 has a tapered surface 11c, movement of the lock ring 13 to the right is restricted. Further, the tip 13 b of the lock ring 13 is strongly sandwiched between the tube 1 and the inner cylinder 11, and the claw 13 d strongly bites into the inner peripheral surface of the tube 1. Therefore, the tube 1 is sufficiently locked by the lock ring 13. Therefore, it is possible to reliably prevent the tube 1 from coming out of the socket 51.

  When a pulling force in the left direction is applied to the tube 2, the tube 2 moves slightly to the left. Then, the lock ring 23 is pulled slightly to the left by the tube 2. However, since the outer cylinder 22 has a tapered surface 22c, the movement of the lock ring 23 to the left is restricted. Further, the distal end portion 23 b of the lock ring 23 is strongly sandwiched between the tube 2 and the outer cylinder 22, and the claw 23 d strongly bites into the outer peripheral surface of the tube 2. Therefore, the tube 2 is sufficiently locked by the lock ring 23. Therefore, it is possible to reliably prevent the tube 2 from coming out of the socket 51.

  Thus, according to the socket 51, the lock ring 13 is located on the inner peripheral surface side of the tube 1 having a relatively accurate inner diameter, and the tube 2 has a relatively accurate outer diameter. The lock ring 23 is located on the outer peripheral surface side. According to the socket 51, the inner peripheral surface of the tube 1 having a relatively accurate inner diameter can be gripped by the lock ring 13, and the outer peripheral surface of the tube 2 having a relatively accurate outer diameter can be gripped by the lock ring 23. can do. Therefore, both the tube 1 and the tube 2 can be sufficiently locked. According to the socket 51, the pipes 1 and 2 of different types can be easily connected, and the connection state can be maintained well.

  In the present embodiment, in the receiving port 10 to which the pipe 1 having a relatively accurate inner diameter is connected, the seal ring 14 is provided in the inner cylinder 11 and the receiving port to which the tube 2 having a relatively accurate outer diameter is connected. 20, the seal ring 24 is provided on the outer cylinder 22. Therefore, the seal ring 14 can be disposed on the inner peripheral surface of the tube 1, and the tube 1 can be sealed from the inside. Moreover, the seal ring 24 can be arrange | positioned on the outer peripheral surface of the pipe | tube 2, and the pipe | tube 2 can be sealed from an outer side. Therefore, it is possible to satisfactorily seal between the tube 1 and the receiving port 10 and between the tube 2 and the receiving port 20.

  In addition, since the so-called inner diameter seal is performed at the receiving port 10, even when the outer cylinder 12 is damaged, the sealing performance between the pipe 1 and the inner cylinder 11 can be maintained, and water leakage is prevented. be able to. In the present embodiment, the tube 1 is a three-layer tube including an intermediate layer made of aluminum. Aluminum is susceptible to corrosion when exposed to water. However, at the receiving port 10, the seal ring 14 seals between the inner peripheral surface of the tube 1 and the outer peripheral surface of the inner cylinder 11. Therefore, it is possible to prevent the aluminum intermediate layer from coming into contact with water when water is passed through the pipe 1 and the pipe 2. Therefore, corrosion of the intermediate layer can be prevented.

  In the present embodiment, as shown in FIG. 2, two seal rings 14 are provided on the left and right sides of the lock ring 13 in the receiving port 10, and one seal ring 24 is provided on the right side of the lock ring 23 in the receiving port 20. It has been. However, the number and position of the seal ring 14 and the seal ring 24 are not particularly limited. For example, two seal rings 14 may be provided on the right side of the lock ring 13, or only one seal ring 14 may be provided on the left or right side of the lock ring 13. Two seal rings 24 may be provided, or only one seal ring 24 may be provided on the distal end side of the inner cylinder 21. Similar to the receiving port 10, the seal ring 24 can be provided on the inner cylinder 21 at the receiving port 20.

  As shown in FIG. 1, marks 41 and 42 may be provided on the outer cylinder 12 and the outer cylinder 22 so that the operator can easily identify the first receiving port 10 and the second receiving port 20. Good. The form of the marks 41 and 42 is not limited at all, and, for example, characters, figures, symbols, patterns, lines, pictures, color coding, and the like can be suitably used. In addition, by making the external shapes of the outer cylinder 12 and the outer cylinder 22 different, the first receiving port 10 and the second receiving port 20 can be easily identified.

(Second Embodiment)
As shown in FIGS. 5 and 6, the pipe joint according to the second embodiment is an elbow 52, which is a pipe joint that connects two pipes in directions orthogonal to each other. The elbow 52 includes a first receiving port 10 into which the first tube 1 is inserted, a second receiving port 20 into which the second tube 2 is inserted, and the joint body 5. The joint body 5 is formed in a substantially L shape. A flow path 6 whose flow direction changes by 90 degrees is formed inside the joint body 5. In the present embodiment, the pipe 1, the pipe 2, and the elbow 52 constitute a bent pipe structure.

  As shown in FIG. 5, a plurality of ribs 7 are provided outside the joint body 5. The rigidity of the joint body 5 is enhanced by these ribs 7. However, the rib 7 is not always necessary.

  The 1st receiving port 10, the 2nd receiving port 20, the 1st pipe | tube 1, and the 2nd pipe | tube 2 are the same as that of 1st Embodiment. Therefore, those descriptions are omitted. In the present embodiment, a mark for identifying the first receiving port 10 and the second receiving port 20 may be provided.

  Also in this embodiment, the same effect as that of the first embodiment can be obtained.

(Third embodiment)
As shown in FIGS. 7 and 8, the pipe joint according to the third embodiment is a cheese 53, which is a pipe joint that connects three pipes. As shown in FIG. 8, the joint body 5 of the cheese 53 is formed in a substantially T shape. A first receiving port 10 is provided on the left side of the joint body 5, a first receiving port 10 is provided on the right side of the joint body 5, and a second receiving port 20 is provided on the upper side of the joint body 5. ing. As shown in FIG. 7, the first pipe 1 is connected to each first receiving port 10, and the second pipe 2 is connected to the second receiving port 20. In the present embodiment, a substantially T-shaped piping structure is configured by the two pipes 1, the pipes 2, and the cheese 53.

  As shown in FIG. 7, also in the present embodiment, a plurality of ribs 7 are provided outside the joint body 5. However, the rib 7 is not always necessary.

  The 1st receiving port 10, the 2nd receiving port 20, the 1st pipe | tube 1, and the 2nd pipe | tube 2 are the same as that of 1st Embodiment. Therefore, those descriptions are omitted. Also in the present embodiment, a mark for identifying the first receiving port 10 and the second receiving port 20 may be provided.

  Also in this embodiment, the same effect as that of the first embodiment can be obtained.

  In addition, in the cheese 53, the arrangement pattern of the 1st receptacle 10 and the 2nd receptacle 20 is not limited at all. For example, as illustrated in FIG. 9, the first receiving port 10 may be provided on the upper side of the joint body 5, and the second receiving ports 20 may be provided on the left side and the right side of the joint body 5. As shown in FIG. 10, the first receiving port 10 may be provided on the left side of the joint body 5, and the second receiving ports 20 may be provided on the right side and the upper side of the joint body 5. Further, as shown in FIG. 11, the first receiving port 10 may be provided on the right side and the upper side of the joint body 5, and the second receiving port 20 may be provided on the left side of the joint body 5.

(Fourth embodiment)
By the way, in different types of pipes, the wall thickness is often slightly different due to the slightly different inner diameter or outer diameter. Therefore, the inner cylinder 11 of the first receiving port 10 and the inner cylinder 21 of the second receiving port 20 may be configured to have different outer diameters. Moreover, you may comprise the outer cylinder 12 of the 1st receiving port 10, and the outer cylinder 22 of the 2nd receiving port 20 so that a mutual internal diameter may differ. The form in which the outer diameter of the inner cylinder 11 and the outer diameter of the inner cylinder 21 are different is not limited at all. For example, the inner diameters of the inner cylinder 11 and the inner cylinder 21 may be made equal while their thicknesses are different. The inner cylinder 11 and the inner cylinder 21 may have the same wall thickness while being different in inner diameter. Further, the form in which the inner diameter of the outer cylinder 12 is different from the inner diameter of the outer cylinder 22 is not limited. For example, even if the outer diameters of the outer cylinder 12 and the outer cylinder 22 are made equal, their thicknesses are different. The outer diameters of the outer cylinder 12 and the outer cylinder 22 may be equalized while their outer diameters may be different.

  Thereby, the lock ring 13 and the lock ring 23 can hold | grip the 1st pipe | tube 1 and the 2nd pipe | tube 2 still more firmly, Therefore, the 1st pipe | tube 1 and the 2nd pipe | tube 2 are pipe fittings. It becomes harder to come off from. Therefore, the connection state of the first pipe 1 and the second pipe 2 with respect to the pipe joint can be maintained better.

(Other embodiments)
The pipe joint according to the present invention may include at least one first receiving port and two second receiving ports, but the number of first receiving ports and the number of second receiving ports are respectively It is not necessarily limited to one. As in the third embodiment, the total number of receiving ports may be three. Further, the total number of receiving ports may be four or more. The pipe joint according to the present invention may be a so-called header.

DESCRIPTION OF SYMBOLS 1 1st pipe | tube 2 2nd pipe | tube 5 Joint main body 6 Flow path 10 1st receiving port 11 1st inner cylinder 12 1st outer cylinder 13 1st lock ring 20 2nd receiving port 21 2nd Inner cylinder 22 Second outer cylinder 23 Second lock ring 51 Socket (pipe joint)
52 Elbow (Fitting)
53 Cheese (Fitting)

Claims (8)

A first receiving port into which the first tube is inserted, a second receiving port into which the second tube is inserted, and a flow path that communicates the first receiving port and the second receiving port. A pipe joint comprising a formed joint body,
The first receiving port has a first inner cylinder and a first outer cylinder that surrounds the first inner cylinder, and the first inner cylinder and the first outer cylinder Configured to sandwich the first tube therebetween,
The second receiving port has a second inner cylinder and a second outer cylinder surrounding the second inner cylinder, and the second inner cylinder and the second outer cylinder Configured to sandwich the second tube therebetween,
A first lock ring provided on an outer peripheral surface of the first inner cylinder;
And a second lock ring provided on the inner peripheral surface of the second outer cylinder. The first lock ring is located between the root portion located on the joint body side, a tip portion located on the opposite side of the joint body, and between the root portion and the tip portion, and is radially outward. And a curved portion that is convex toward the front, and a claw is formed on each of the distal end portion and the curved portion on the outside in the radial direction,
The second lock ring is located between the root portion located on the joint body side, a tip portion located on the opposite side of the joint body, and between the root portion and the tip portion, and is radially inward. 2. The pipe joint according to claim 1, wherein a claw is formed on a radially inner side of the distal end portion and the curved portion.   The pipe joint according to claim 1 or 2, wherein a seal ring is provided on an outer peripheral surface of the first inner cylinder.   The pipe joint according to any one of claims 1 to 3, wherein a seal ring is provided on an inner peripheral surface of the second outer cylinder.   The pipe joint according to any one of claims 1 to 4, wherein the first outer cylinder and the second outer cylinder have different inner diameters.   The pipe joint according to any one of claims 1 to 5, wherein the first inner cylinder and the second inner cylinder have different outer diameters. The pipe joint according to any one of claims 1 to 6, a first pipe connected to a first receiving port of the pipe joint, and a second pipe connected to a second receiving port of the pipe joint. A pipe structure comprising two pipes,
A piping structure in which the first pipe and the second pipe are of different types.   The piping structure according to claim 7, wherein the first tube and the second tube have different inner diameters or outer diameters.

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