JP2010265955A - Joint - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a joint stably fixable in spite of the synthetic resin-made joint. <P>SOLUTION: The joint 2 made of synthetic resin includes a joint body 3 formed in cylinder shape so that the inside is a flow passage 3a. The joint body 3 has a bent part 3b. The joint 2 includes a connection port 3c to which a fluid pipe 1 is connected, on one side of the joint body 3, and a connection port 3d to which a connected member such as a faucet, a fluid pipe or another joint is connected, on the other side of the joint body 3. The joint 2 has a flange 4 formed extending from the joint body 3 and formed in frame shape to surround the bent part 3b. The flange 4 is provided with fixing holes 4a for inserting through fasteners to fix the flange 4 to a fixed part such as a column. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a joint provided with a flange.

  Conventionally, there has been a joint made of metal or synthetic resin and having a flange for fixing (for example, see Patent Document 1). As shown in FIG. 9, the joint 22 includes a fluid pipe connection port 24 to which the fluid pipe 21 is connected to one end of the joint body 23, and a faucet to which a water faucet is connected to the other end. A connection port 25 was provided. A flange 26 extends from the joint body 23, and a fixing hole 27 for fixing the flange 26 to the crosspiece is formed.

JP-A-6-66391

  By the way, if the conventional joint 22 is made of metal, it is heavy, and if it is made of synthetic resin, when an external force is applied to the joint body 23, the flange 26 is bent and the fixation to the crosspiece may be unstable. was there.

  The present invention has been made to solve the above-described conventional drawbacks, and an object of the present invention is to provide a joint that can be stably fixed while being made of a synthetic resin.

In order to achieve the above object, the joint according to the present invention has the following configuration. That is,
The joint according to the first aspect of the present invention is provided with a connection port to which a fluid pipe is connected to one side of a joint body which is formed in a cylindrical shape so that the inside becomes a flow passage and has a bent portion, and the joint body The other is a joint made of a synthetic resin provided with a connection port to which a connected member such as a water faucet, a fluid pipe, or another joint is connected. The joint is formed by extending a flange having a frame shape so as to surround the bent portion from the joint body. The flange is provided with a fixing hole through which a fixing tool is inserted in order to fix the flange to a fixed part such as a pillar.

  According to this synthetic resin joint, the flange is provided with a fixing hole, and the flange, and thus the joint, is fixed to the fixed part via a fixing tool inserted through the fixing hole. Here, the flange has a frame shape surrounding the bent portion of the joint body, and is formed to extend from the joint body. Thus, since the flange has a frame shape and surrounds the bent portion of the joint body, the rigidity of the flange with respect to the joint body is increased. Therefore, the joint can be stably fixed by fixing the flange to the fixed portion via the fixing tool.

  In addition, a joint according to the invention of claim 2 comprises the joint of claim 1, and the flange has a square frame shape, and at least two of the plate portions constituting the square. The fixing hole is provided. Thereby, according to the arrangement | positioning position of a to-be-fixed part, the board part provided with the fixing hole can be selected and used.

  Further, a joint according to the invention described in claim 3 comprises the joint described in claim 2, and the flange is arranged on the inside of two or three corners of the square frame shape of the flange, such as a column. A cylindrical fixing portion having another fixing hole through which the fixing tool is inserted for fixing to the fixed portion is provided. Thereby, when fixing a joint, according to the arrangement | positioning position of a to-be-fixed part, the fixing | fixed part in a flange can be selected and used other than the board part provided with the fixing hole.

  According to a fourth aspect of the present invention, there is provided a joint according to any one of the first to third aspects, wherein the connection port is formed so that at least a tip portion projects from the flange.

  Further, a joint according to the invention described in claim 5 comprises the joint according to any one of claims 1 to 4, wherein the joint body includes a synthetic resin body tube portion that forms the flow passage. And a synthetic resin main body exterior portion that covers the outer peripheral surface of the main body cylinder portion without forming the flow passage. And the said flange is extended and formed from the said main body exterior part. Thus, by making the joint main body a multi-layer structure of the main body cylinder portion and the main body exterior portion, the main body exterior portion can restrict the main body cylinder portion from being pushed by the internal water pressure. The main body cylinder part is in direct contact with the fluid and directly receives the fluid pressure, and the main body exterior part regulates the expansion of the main body cylinder part due to the fluid pressure, and the flange is formed to protrude. The synthetic resin material to be used can be selected according to the respective functions of the main body exterior portion. Thus, even if this joint is made of a synthetic resin, a strength thereof can be ensured by adopting a multilayer structure of the main body cylinder portion and the main body exterior portion.

  Further, the joint according to the invention of claim 6 comprises the joint of claim 5, and in the connection port, a metal nut into which the connected member is screwed is inserted into the main body cylinder portion. Is done.

  A joint according to the invention of claim 7 comprises the joint of claim 6, wherein, in the connection port, the body exterior portion has at least a rear end portion of the nut sandwiching the body cylinder portion. The flange extends from a portion of the body exterior portion that covers and covers the nut across the body cylinder portion. Thereby, the external force applied to the nut through the connected member such as a faucet can be directly received by the flange from the connection port.

  A joint according to an eighth aspect of the present invention is the joint according to any one of the fifth to seventh aspects, wherein the main body exterior portion is more than the front end of the main body cylinder portion at the connection port. It has a protruding part that protrudes. The protruding portion is provided with a retaining locking portion for locking the fluid pipe inserted into the connecting port in a retaining state.

  A joint according to the invention described in claim 9 is the joint according to any one of claims 1 to 8, and a space capable of accommodating a heat insulating material is formed in the frame of the flange. . Thereby, a joint main body can be heat-retained by accommodating a heat insulating material in the space in the frame of a flange.

  According to the joint according to the present invention, since the flange has a frame shape and surrounds the bent portion of the joint main body, the rigidity of the flange with respect to the joint main body is increased. It can be stably fixed to the fixed part.

It is a perspective view of a joint of one embodiment of this invention. Similarly, it is a perspective view of a main part cylinder part. Similarly, it is a front view of a joint. Similarly, it is a side view of a joint. Similarly, it is sectional drawing by the AA line in FIG. Similarly, it is sectional drawing by the BB line in FIG. Similarly, it is sectional drawing which shows the state which connected the fluid pipe | tube to the coupling. Similarly, it is sectional drawing by CC line in FIG. It is a side view which shows the conventional coupling.

  EMBODIMENT OF THE INVENTION Hereinafter, the form for implementing the coupling which concerns on this invention is demonstrated based on drawing.

  1 to 8 show an embodiment of the present invention. Reference numeral 1 in the figure denotes a fluid pipe such as a hot water pipe for supplying hot water (water or hot water). Reference numeral 2 denotes a synthetic resin joint to which the fluid pipe 1 is connected.

  The joint 2 includes a joint body 3 which is formed in a cylindrical shape so as to be a flow passage 3a for fluid such as hot water, and has a bent portion 3b, and a flange 4 which is formed to extend from the joint body 3. . Therefore, the joint 2 includes a connection port 3c to which the fluid pipe 1 is connected to one side of the joint body 3, and a connected member (a faucet, a fluid pipe, or another joint to the other side of the joint body 3 ( A connection port 3d to which a not shown) is connected is provided. On the other hand, the flange 4 extends from the joint body 3 so as to have a frame shape so as to surround the bent portion 3 b of the joint body 3. And in the frame of the flange 4, the space S which can accommodate a heat insulating material is formed. The flange 4 is provided with a fixing hole 4a through which a fixing tool such as a screw or a nail is inserted in order to fix the flange 4 to a fixed portion such as a pillar, a crosspiece, or a wall.

  Specifically, the flange 4 has a square frame shape (in the illustrated embodiment, a square shape), and at least two of the plate portions 4b, 4b constituting the square (in the illustrated embodiment, 3) is provided with the fixing hole 4a. And, in order to fix the flange 4 to a fixed part such as a pillar inside two or three (two in the illustrated embodiment) corners of the rectangular frame shape in the flange 4, A cylindrical fixing portion 4d having another fixing hole 4c through which a fixing tool such as a screw or a nail is inserted is provided. Further, inside the intermediate position of the plate portion 4b (specifically, a fourth plate portion 404 to be described later) in the flange 4, in order to fix the flange 4 to a fixed portion such as a column, screws, nails, etc. A cylindrical fixing portion 4f provided with another fixing hole 4e through which the fixing tool is inserted is provided.

  Specifically, the fluid pipe 1 is a flexible synthetic resin pipe, and is made of, for example, a synthetic resin pipe such as cross-linked polyethylene or polybutene. As shown in FIGS. 7 and 8, the fluid pipe 1 has a ring body 5 provided on the outer periphery at a predetermined distance from the tip at an end portion 1 a. The ring body 5 is formed in a cylindrical shape so that a water stop member 6 made of packing such as an O-ring adheres to the end portion 1a of the fluid pipe 1 (specifically, the outer periphery of the end portion 1a). It is fitted and fixed to the outer periphery of the end portion rear portion 1c) behind the end portion front portion 1b. In addition, the code | symbol 7 in a figure is an in-core, This in-core 7 is inserted in the fluid pipe | tube 1 before the ring body 5 is attached.

  The joint 2 is composed of an elbow that is bent at a right angle so that the joint body 3 is L-shaped. The joint body 3 includes a synthetic resin main body cylinder portion 8 that forms the flow passage 3a, and a synthetic resin main body exterior portion 9 that covers the outer peripheral surface of the main body cylinder portion 8 without forming the flow passage 3a. It is composed of The flange 4 is formed to extend from the main body exterior portion 9. Specifically, the joint 2 is a double-molded product including a main body cylinder portion 8 and a main body exterior portion 9 and an exterior body 10 including the flange 4. That is, the joint 2 includes a main body cylinder portion 8 and an exterior body 10 formed by inserting the main body cylinder portion 8. Here, the main body cylinder portion 8 is made of, for example, a PPS (polyphenylene sulfide) resin material. And the exterior body 10 consists of nylon resin materials containing fibers, such as glass fiber, for example. That is, the main body cylinder portion 8 and the exterior body 10 (the main body exterior portion 9 and the flange 4) are relatively made of the main body cylinder portion 8 made of a soft synthetic resin material and the exterior body 10 made of a hard synthetic resin material. . Whether it is soft or hard is determined by the elastic modulus (especially bending elastic modulus) of the material, that is, the rigidity. When the elastic modulus is relatively small, it is soft, and when it is large It is hard.

  In the connection port 3 c, the distal end portion of the main body cylinder portion 8 serves as a fluid tube receiving port 8 a that receives the fluid tube 1. The fluid pipe receiving port 8a has a large-diameter portion 8b formed with a large diameter inside the tip. Therefore, as shown in FIG. 7 and FIG. 8, the water stop member 6 is fitted into the large diameter portion 8b, and the ring-shaped pressing member 11 that holds the water stop member 6 so as not to come out is provided with a large diameter portion. It fits so that it may straddle the inside of 8b and the protrusion part 9a mentioned later. The water stop member 6 is in close contact with the outer peripheral surface of the end portion front portion 1 b in the fluid pipe 1, so that the body tube portion 8 of the joint 2 is kept watertight between the fluid pipe 1. By the way, the pressing member 11 has an engaging portion 11a that engages with an engaged portion 3e provided in the connecting port 3c, and the pressing member 11 is fixed to the connecting port 3c by this engagement. In the illustrated embodiment, the engaging portion 11a is formed of a protrusion, and the engaged portion 3e is formed from a through hole provided in a main body exterior portion 9 (specifically, a protruding portion 9a described later) in the connection port 3c. (See FIG. 7).

  In the connection port 3 c, the main body exterior portion 9 has a protruding portion 9 a that protrudes beyond the tip of the main body cylinder portion 8. The projecting portion 9a is a ring body receiving port whose inner circumferential surface is flush with the inner circumferential surface of the large diameter portion 8b in the fluid pipe receiving port 8a and receives the ring body 5 provided in the fluid pipe 1. . Further, a retaining engagement portion 9b for retaining the fluid pipe 1 inserted into the connecting port 3c in a retaining state is provided at the projecting portion 9a (specifically, the tip portion of the projecting portion 9a). The retaining locking portion 9b has an opening on its outer periphery (specifically, it opens in each retaining tool insertion portion 9c projecting at four locations on the outer periphery of the retaining locking portion 9b), and the connection port 3c. It has a hole 9d opened so as to cross the inside, and a latching part 9e formed so as to project from the outer periphery in a bowl shape. In this way, the retaining locking part 9b is formed, and the retaining tool 12 is attached to the retaining locking part 9b.

  The retainer 12 is made of, for example, a metal wire and is formed in a substantially U shape (see FIG. 1). Therefore, as shown in FIGS. 7 and 8, the retainer 12 is configured so that the opposing U-shaped opposing pieces 12 a and 12 a sandwich the fluid pipe 1 so that the opposing pipes 12 a and 12 a sandwich the fluid pipe 1. It is inserted into 9d and engages with the rear end of the ring body 5. At this time, the intermediate piece 12b connecting the opposing pieces 12a, 12a in the retaining member 12 is hooked on the retaining portion 9e, and thus the retaining member 12 is attached to the retaining engagement portion 9b. 12, the ring body 5, and thus the fluid pipe 1 is prevented from coming off from the connection port 3c.

  In addition, the flange 4 extends from the main body exterior portion 9 in the connection port 3c. In the illustrated embodiment, the flange 4 (specifically, the first plate portion 401 as the plate portion 4b) is a portion that covers the fluid pipe receiving port 8a in the connecting port 3c (specifically, the main body exterior portion 9). ) To the periphery (specifically, to extend in a direction perpendicular to the axis of the connection port 3c).

On the other hand, in the connection port 3d, the flange 4 (specifically, the second plate portion 402 as the plate portion 4b) extends so as to spread from the connection port 3d. In the connection port 3d, a metal nut 13 into which the connected member is screwed is inserted into the main body cylinder portion 8. In the illustrated embodiment, the nut 13 is inserted when the main body cylinder portion 8 is molded. And in this connection port 3d, the main body exterior portion 9 covers at least the rear end portion of the nut 13 (that is, the end portion of the nut 13 on the base end side of the connection port 3d) across the main body cylinder portion 8, The flange 4 extends from a portion of the main body exterior portion 9 that covers the nut 13 with the main body cylinder portion 8 interposed therebetween. In the illustrated embodiment, at the connection port 3d, the main body exterior portion 9 covers the rear end portion of the nut 13 with the main body cylinder portion 8 interposed therebetween, and the plate constituting the flange 4 from the front end of the main body exterior portion 9 The portion 4b (specifically, the second plate portion 402) extends so as to spread around (specifically, spread in a direction perpendicular to the axis of the connection port 3d). Thereby, the connection port 3d is formed so that at least the tip portion protrudes from the flange 4. And in this connection port 3d, the front end side of the main body cylinder portion 8 is exposed without being covered with the main body exterior portion 9.

  The flange 4 includes first to fourth plate portions 401, 402, 403, 404 as the plate portion 4b so as to form a square (specifically, square) frame shape. Here, as described above, the first plate portion 401 is provided in the connection port 3c, and the second plate portion 402 is provided in the connection port 3d. The plate portion 402 is connected at a right angle. And on the outer side where the bent portion 3 b of the joint body 3 is bent, a third plate portion 403 positioned parallel to the first plate portion 401, and a fourth plate portion 404 positioned parallel to the second plate portion 402, Is provided. Thus, the flange 4 has a frame shape that opens in a direction perpendicular to the axis of the connection port 3c and the axis of the connection port 3d. An auxiliary plate 4g extending so as to connect the flange 4 and the joint body 3 is provided inside the flange 4.

  The fixing hole 4a is formed in the second to fourth plate portions 402, 403, and 404. Each of the opposing plate portions 404, 401, 402 is appropriately provided with a relief portion 4h that allows the tool at the time of fixation to be cut out at a position facing the opposite fixing hole 4a. . Therefore, in the second plate portion 402, the flat surface becomes, for example, an abutting surface that abuts against a flat surface (specifically, the back surface) of the wall as the fixed portion. That is, a wall hole into which the connection port 3d is inserted is formed in the wall, and the connection port 3d is inserted into the wall hole so as to face the wall surface from the back side of the wall, so that the second plate portion 402 ( In detail, the contact surface) contacts the wall (specifically, the back surface). Then, a fixing tool such as a screw or a nail is inserted into the fixing hole 4a provided in the second plate portion 402 and is screwed or driven into the wall. Further, in the third plate portion 403 and the fourth plate portion 404, the flat surface becomes a contact surface that comes into contact with a flat surface of a column, a crosspiece, or a wall as a fixed portion. Therefore, the third plate portion 403 and the fourth plate portion 404 (specifically, the contact surface) are in contact with the pillar, the crosspiece, and the wall, and the fixing member is connected to the third plate portion 403 and the fourth plate. It is inserted into a fixing hole 4a provided in the portion 404 and is screwed or driven into a pillar, a crosspiece or a wall.

  Next, the effect of the joint 2 which consists of the above structure is demonstrated. According to this synthetic resin joint 2, the flange 4 is provided with a fixing hole 4 a, and the flange 4, and consequently the joint 2, is connected to the fixed portion via a fixing tool inserted through the fixing hole 4 a. Fixed. Here, the flange 4 is formed in a frame shape surrounding the bent portion 3 b of the joint body 3 and extending from the joint body 3. Thus, since the flange 4 has a frame shape and surrounds the bent portion 3b of the joint body 3, the rigidity of the flange 4 with respect to the joint body 3 is increased. Therefore, by fixing the flange 4 to the fixed portion via the fixing tool, the joint 2 can be stably fixed to the fixed portion while being made of synthetic resin. As a result, the joint body 3 receives an external force due to a change in the fluid flow at the bent portion 3b, an external force due to a change in the fluid velocity, or a water faucet connected to the connection port 3d. Even when an external force is applied due to the operation of the faucet, wobbling of the joint body 3 can be suppressed.

  In addition, the fixing holes 4a are provided in at least two of the plate portions 4b constituting the square of the flange 4 (in the illustrated embodiment, the second to fourth plate portions 402, 403, 404). Depending on the arrangement position of the fixed part, the plate part 4b provided with the fixing hole 4a can be selected and used. Further, the joint 2 is provided with a fixing part 4 d inside the corner of the frame shape of the flange 4, or a fixing part 4 f inside the intermediate position of the fourth plate part 404. As a result, when fixing the joint 2, the fixing portion 4 d and the fixing portion 4 f in the flange 4 are selected in addition to the plate portion 4 b provided with the fixing hole 4 a according to the arrangement position of the fixed portion. Can be used.

  Further, the flange 4 (specifically, the second plate portion 402) extends from a portion of the main body exterior portion 9 that covers the nut 13 with the main body cylinder portion 8 interposed therebetween in the connection port 3d. Thereby, the external force applied to the nut 13 through the connected member such as a faucet can be received by the flange 4 directly from the connection port 3d.

  In addition, a space S capable of accommodating a heat insulating material is formed in the frame of the flange 4, and the joint body 3 can be kept warm by accommodating the heat insulating material in the space S in the frame of the flange 4. it can. However, the space S in the frame and the outside may be blocked by covering the frame of the flange 4 without accommodating the heat insulating material in the space S, thereby keeping the joint body 3 warm.

  Further, the joint main body 3 has a multi-layer structure of the main body cylinder portion 8 and the main body exterior portion 9, so that the main body exterior portion 9 can restrict the expansion of the main body cylinder portion 8 by being pressed by the internal water pressure. it can. And the main body cylinder part 8 contacts the fluid and receives the fluid pressure directly, and the main body exterior part 9 regulates the expansion of the main body cylinder part 8 by the fluid pressure, and the flange 4 is formed to project ( In addition, in the illustrated embodiment, a retaining locking portion 9b is provided), and the synthetic resin material to be used is individually selected according to the functions of the main body cylinder portion 8 and the main body exterior portion 9. Can be selected. Thus, even if this coupling 2 is made of a synthetic resin by having a multilayer structure of the main body cylinder portion 8 and the main body exterior portion 9, the strength thereof can be ensured.

  In particular, since the main body cylinder portion 8 is soft and has high impact resistance, it can withstand impacts caused by fluctuations in water pressure. And since the main body exterior part 9 is hard and has high rigidity, the expansion of the main body cylinder part 8 due to water pressure can be firmly received. Further, by providing the main body exterior part 9 with the retaining latching part 9b, it is possible to accurately prevent the fluid pipe 1 from coming off at the connection port 3c. Furthermore, since the flange 4 protrudes from the main body exterior portion 9, the rigidity of the entire joint 2 including the flange 4 can be increased.

  And since the joint 2 is a multilayer structure which the joint main body 3 consists of the main body cylinder part 8 which contacts fluids, such as hot water, and the main body exterior part 9 provided not to contact fluids, such as hot water, A material having chlorine resistance and heat resistance can be selected for the main body cylinder portion 8, and a material having lower performance than the main body cylinder portion 8 can be selected for the main body exterior portion 9. Therefore, a material different from a material having the performance required for the main body cylinder portion 8 can be used for the main body exterior portion 9, and an inexpensive material is used for the main body cylinder portion 8 having a plurality of performances. The material cost of the joint 2 can be reduced. However, as a matter of course, a material having higher performance than the main body cylinder portion 8 may be used as the material of the main body exterior portion 9, that is, the material of the exterior body 10.

  Further, the joint 2 is composed of a body cylinder portion 8 and an exterior body 10 formed by insert molding, and the body cylinder portion 8 and the body exterior portion 9 in the exterior body 10 form a layer. Can suppress nests and sink marks and increase wall thickness.

  In addition, this invention is not necessarily limited to embodiment mentioned above, A various other change is possible. For example, the fluid targeted by the joint 2 may not be hot water but may be other liquids, and may be other gases such as fuel gas in addition to the liquids.

  The joint 2 is composed of an elbow whose joint body 3 bends at a right angle, but it does not necessarily have to be a right angle, and may be an elbow that bends at 30 ° or 120 ° or other angles. Furthermore, if the joint main body 3 has the bending part 3b, the joint 2 may consist of the cheese in which the shape of the joint main body 3 was formed in T shape other than an elbow, for example.

  The flange 4 has a frame shape that opens in a direction perpendicular to the axis of the connection port 3c and the axis of the connection port 3d. For example, the flange 4 has a frame shape that opens in the direction of the axis of the connection port 3d. It may be a frame shape that opens in the direction of the axis of the connection port 3c, or may have a frame shape that opens in other directions.

  In addition, the flange 4 may have a triangular or pentagonal frame shape instead of a square shape, or may include a curved surface in part or a curved surface as a whole.

  In addition, in the connection port 3d, a metal nut 13 is inserted into the main body cylinder portion 8. However, the nut 13 is eliminated and a female screw is formed in the synthetic resin itself of the main body cylinder portion 8. Good. Further, the connection port 3d may have a male screw for connection but may have a male screw or other connection structure.

  Further, the joint 2 may be molded at a time even if it is not a double molded product of the main body cylinder portion 8 and the exterior body 10.

  In the connection port 3d, the front end side of the main body cylinder portion 8 is exposed from the flange 4, but it may be covered by the main body exterior portion 9 including the front end side.

DESCRIPTION OF SYMBOLS 1 Fluid pipe 2 Joint 3 Joint main body 3a Flow path 3b Bending part 3c Connection port 3d Connection port 4 Flange 4a Fixing hole 4b Plate part 4c Other fixing hole 4d Fixing part 8 Main body cylinder part 9 Main body exterior part 9a Protruding part 9b Keeping out Locking part 13 Nut S Space

Claims (9)

One of the joint bodies formed in a cylindrical shape so that the inside becomes a flow path and having a bent portion is provided with a connection port to which a fluid pipe is connected, and the other of the joint body has a faucet, a fluid pipe, and other A joint made of synthetic resin, having a connection port to which a connected member such as a joint is connected,
A flange having a frame shape so as to surround the bent portion is formed extending from the joint body,
The said flange is provided with the fixing hole in which a fixing tool is penetrated in order to fix the flange to to-be-fixed parts, such as a pillar.   The joint according to claim 1, wherein the flange has a square frame shape, and the fixing holes are provided in at least two of the plate portions constituting the square.   A cylindrical shape provided with another fixing hole through which a fixing tool is inserted in order to fix the flange to a fixed part such as a column inside the two or three corners of the square frame shape in the flange. The joint according to claim 2, wherein a fixing portion is provided.   The joint according to any one of claims 1 to 3, wherein at least a tip end portion of the connection port is formed to protrude from the flange. The joint body is composed of a synthetic resin main body cylinder portion that forms the flow passage, and a synthetic resin main body exterior portion that covers the outer peripheral surface of the main body cylinder portion without forming the flow passage,
The joint according to any one of claims 1 to 4, wherein the flange is formed to extend from the main body exterior portion.   The joint according to claim 5, wherein a metal nut into which the connected member is screwed is inserted into the main body cylindrical portion in the connection port.   In the connection port, the body exterior portion covers at least a rear end portion of the nut with the body cylinder portion interposed therebetween, and a portion of the body exterior portion covers the nut with the body cylinder portion sandwiched therebetween. The joint according to claim 6, wherein In the connection port, the main body exterior portion has a protruding portion that protrudes from the tip of the main body cylinder portion,
The joint according to any one of claims 5 to 7, wherein the protruding portion is provided with a retaining locking portion for locking the fluid pipe inserted into the connecting port in a retaining state. .   The joint according to any one of claims 1 to 8, wherein a space capable of accommodating a heat insulating material is formed in a frame of the flange.

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