JP6927831B2 - Joint member and pipe connection structure - Google Patents

Description

The present invention relates to a joint member that prevents a pipe body inserted into the connection cylinder portion from coming off by a clip fitted to the connection cylinder portion, and a pipe connection structure provided with the joint member.

In the joint member shown in Patent Document 1, a U-shaped clip enters the inside of the connecting cylinder portion through a communication hole formed in the cylinder wall of the connecting cylinder portion, and the clip is formed on the outer surface of the pipe body. Engage with the annular groove.

Japanese Unexamined Patent Publication No. 2011-106604 (paragraph [0029], FIGS. 3 and 4)

By the way, in the joint member of Patent Document 1, when the pipe body is removed from the joint member, there is a problem that the clip falls off from the connecting cylinder portion, and eventually the clip is lost.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a joint member capable of preventing a clip from falling off or being lost, and a pipe connection structure provided with the joint member.

The invention of claim 1 made to achieve the above object fits into a connecting cylinder portion into which a pipe body to be connected is inserted inside and a peripheral groove formed on an outer peripheral surface of the connecting cylinder portion. , A clip that can be opened and closed in the circumferential direction, a communication hole formed through the bottom wall of the peripheral groove, and a communication hole that is projected from the inner peripheral surface of the clip and passes through the communication hole to the inside of the connection cylinder portion. In a joint member having an engaging protrusion that enters and engages with an engaging groove formed on the outer peripheral surface of the pipe body, the engaging protrusion is disengaged from the communication hole in the connecting cylinder portion. It is a joint member integrally formed with a dropout restricting claw that locks the clip when it rides on the groove bottom wall and regulates the clip from coming off from the connecting cylinder portion.

According to the second aspect of the present invention, the connecting cylinder portion has an overhanging protrusion portion protruding outward from a portion deviated from the peripheral groove in the axial direction thereof, and the dropout restricting claw is said to be said from the overhanging protrusion portion. The joint member according to claim 1, comprising a support projecting piece extending along the axial direction of the connecting cylinder portion and a locking projection protruding from the tip of the supporting projecting piece in a direction approaching the connecting cylinder portion.

According to a third aspect of the present invention, the peripheral groove is formed in a C shape, and the overhanging protrusion portion is arranged in the circumferential direction of the connecting cylinder portion on the side opposite to the non-formed portion of the peripheral groove. Item 2. The joint member according to item 2.

According to a fourth aspect of the present invention, the clip faces the insertion port side of the connection cylinder portion into which the tubular body is inserted and approaches the center of the clip toward the tip end portion of the engaging protrusion. The joint member according to any one of claims 1 to 3, which has a tip inclined surface away from the surface.

In the invention of claim 5, the engaging protrusion is arranged close to one side or the other side in the central axial direction of the clip, and the communication hole corresponds to the engaging protrusion and the peripheral groove. The joint member according to claim 4, which is arranged close to one side or the other side in the groove width direction of the groove bottom wall of the above.

According to a sixth aspect of the present invention, the clip has a ring portion having a C shape and having the engaging protrusion, and a pair of connecting arms extending so as to approach each other from both ends of the ring portion. Any of claims 1 to 5, wherein the ring-opening state in which a gap is formed between the pair of connecting arms and the ring-closing state in which the pair of connecting arms overlap each other. The joint member according to claim 1.

The invention of claim 7 is the joint according to claim 6, wherein a portion of the connecting cylinder portion that overlaps with the pair of connecting arms in the closed ring state is colored differently from the pair of connecting arms. It is a member.

The invention of claim 8 is the joint member according to claim 6 or 7, wherein the pair of connecting arms is provided with locking projections that lock each other when the ring is closed.

The invention of claim 9 is a pipe connection structure including the joint member according to claim 1 of any one of claims 1 to 8 and the pipe body, and the pipe body has a hose portion outside. It is fixed to the end of the drain hose covered with a heat insulating material, and the tip is inserted into the connecting cylinder and the base end is inserted into the hose. The hose portion and the said A large-diameter tubular portion that sandwiches the heat insulating material is provided, and the clip is formed with a retaining arm that extends in the axial direction of the connecting tubular portion and engages with the base end edge of the large-diameter tubular portion. It is a pipe connection structure.

[Invention of claim 1]
In the present invention, when the engaging protrusion is disengaged from the communication hole and rides on the groove bottom wall of the peripheral groove, the clip is locked with the dropout control claw integrally formed on the connection cylinder portion to be engaged from the connection cylinder portion. It is regulated to come off. As a result, it is possible to prevent the clip from falling off or being lost from the connecting cylinder portion.

[Invention of claim 2]
According to the present invention, it is possible to prevent the clip from coming off in the radial direction of the connecting cylinder portion by the support protrusion extending along the axial direction of the connecting cylinder portion from the overhanging protrusion portion of the connecting cylinder portion, and the tip of the supporting protrusion piece can be prevented. It is possible to prevent the clip from coming off in the axial direction of the connecting cylinder portion by the locking projection and the overhanging protrusion protruding in the direction approaching the connecting cylinder portion.

[Invention of claim 3]
In the present invention, since the overhanging protrusion is arranged on the side opposite to the non-formed portion of the peripheral groove in the circumferential direction of the connecting cylinder portion, when the clip comes off from the peripheral groove, the clip is engaged with the dropout control claw. It becomes easier to stop.

[Invention of claim 4]
According to the present invention, even if the pipe body is inserted into the connecting cylinder portion while the clip is fitted in the peripheral groove, the diameter of the clip is expanded by pressing the tip of the pipe body against the inclined surface at the tip of the engaging protrusion. Therefore, it becomes possible to connect the pipe body to the connecting cylinder portion.

[Invention of claim 5]
According to the present invention, unless the inclined surface at the tip of the engaging protrusion is arranged so as to face the insertion port side, the engaging protrusion cannot be inserted into the communication hole of the connecting cylinder, so that the clip is oriented in the wrong direction. It can be prevented from being attached to the connection cylinder.

[Invention of claims 6 to 8]
In the invention of claim 6, if a gap is formed between the pair of connecting arms, the clip is in a ring-opened state, and if the pair of connecting arms overlap, the clip is in a ring-closed state. According to the present invention, it is possible to make the operator recognize whether or not the clip is fitted in the peripheral groove depending on whether or not a gap is formed between the pair of connecting arms, and the clip is formed in the peripheral groove. It is possible to prevent an engagement failure in which the engagement protrusion of the clip does not engage with the engagement groove of the pipe body without being fitted from the pipe.

Here, if the color of the portion of the connecting cylinder that overlaps with the pair of connecting arms in the closed state is different from the color of the pair of connecting arms, whether or not a gap is formed between the pair of connecting arms. This makes it easier for the operator to recognize the color (invention of claim 7). Further, if the pair of connecting arms is provided with locking projections that lock each other in the ring-closed state, the clip can be easily held in the ring-closed state (invention of claim 8).

[Invention of claim 9]
According to the pipe connection structure of claim 9, the retaining arm formed in the clip is locked to the end edge of the large-diameter cylinder portion of the pipe body, so that a gap is created between the connection cylinder portion and the pipe body. Poor connection can be prevented. Moreover, if the pipe body is fixed to the end of the drain hose whose outside of the hose is covered with a heat insulating material, the hose and the heat insulating part are between the small diameter cylinder inserted into the hose. It is possible to lock the retaining arm to the large-diameter tubular portion that sandwiches the hose.

Schematic configuration of the drain pipe using the pipe connection structure of the first embodiment Side sectional view of pipe connection structure (A) Perspective view seen from the tip side of the tube, (B) Perspective view seen from the base end side Perspective view of joint member Perspective view of the connection cylinder (A) Perspective view of the clip as seen from the tip end side of the retaining arm, (B) Perspective view of the clip as viewed from the base end side of the retaining arm. Planar cross-sectional view of the joint member when the clip is in the ring-closed state (A) plan sectional view, (B) front view of the joint member when the clip is in the ring-opened state. Regular cross section of pipe connection structure Positive cross-sectional view of a pipe connection structure showing another example of a retaining arm Side sectional view of a pipe connection structure provided with a joint member of Reference Embodiment 1. Planar cross-sectional view of the joint member when the clip is in the ring-closed state (A) plan sectional view, (B) front view of the joint member when the clip is in the ring-opened state. Cross-sectional view of the joint member of Reference Embodiment 2 (A) side sectional view, (B) normal sectional view of pipe connection structure

[Embodiment 1]
As shown in FIGS. 1 and 2, the pipe connection structure 100 of the present embodiment is used for the drain pipe 112 for draining the drain water generated in the air conditioner 110 to the drain drain pipe 111, and drains the air conditioner 110. The joint member 10 is connected to the outlet 110A or the drain drain pipe 111, and the pipe body 50 is attached to the end of the drain hose 120. The drain pipe 112 is installed on the ceiling and is arranged in an inverted U shape with the intermediate portion lifted upward.

As shown in FIGS. 3A and 3B, the tubular body 50 includes a small-diameter tubular portion 51, a flange portion 55 projecting outward from the axially intermediate portion of the small-diameter tubular portion 51, and a flange portion. A large-diameter tubular portion 56 extending from the outer edge portion of the 55 to the proximal end side of the small-diameter tubular portion 51 is provided. Then, the pipe body 50 is fixed to the drain hose 120 in a state where the small diameter tubular portion 51 is inserted into the drain hose 120 from the base end side and the flange portion 55 is abutted against the end surface of the drain hose 120. The tube body 50 is fixed to the drain hose 120 by using an adhesive or the like. Specifically, an adhesive is previously applied to the inner peripheral surface of the hose portion 121 of the drain hose 120, the outer peripheral surface and the tip surface of the heat insulating material 122, and the outer peripheral surface of the small diameter tubular portion 51 of the pipe body 50, and drained. By inserting the hose 120 into the pipe body 50, the pipe body 50 is fixed to the drain hose 120. In order to facilitate the insertion of the small diameter cylinder portion 51 into the drain hose 120, the length of the portion of the small diameter cylinder portion 51 arranged on the proximal end side of the flange portion 55 is longer than that of the large diameter cylinder portion 56. The outer peripheral surface of the base end portion of the small diameter tubular portion 51 is formed in a tapered shape in which the diameter is gradually reduced toward the base end side. The tube body 50 is made of, for example, a thermoplastic resin, and is made of a soft polyvinyl chloride resin, a hard polyvinyl chloride resin, a polyolefin resin, or the like.

Here, as shown in FIG. 2, the drain hose 120 has a two-layer structure in which the outside of the hose portion 121 is covered with the heat insulating material 122. Then, the base end portion of the small diameter tubular portion 51 is inserted inside the hose portion 121, and the large diameter tubular portion 56 sandwiches the hose portion 121 and the heat insulating material 122 between the small diameter tubular portion 51. The hose portion 121 is preferably made of, for example, a thermoplastic resin and is preferably made of a polyolefin resin, a vinyl chloride resin, or the like. Further, the heat insulating material 122 is preferably formed of, for example, a foam of a thermoplastic resin of a polyolefin resin such as a polyethylene resin or a polypropylene resin, or a foam rubber.

As shown in FIG. 3A, a first diameter-expanded portion 52 and a second diameter-expanded portion 53 are formed in order from the tip side in a portion of the small-diameter tubular portion 51 on the tip end side of the flange portion 55. .. A first annular groove 52M to which an O-ring (not shown) is mounted is formed on the outer peripheral surface of the first enlarged diameter portion 52. Further, a second annular groove 53M that engages with the clip 30 of the joint member 10, which will be described later, is formed on the outer peripheral surface of the second diameter-expanded portion 53. In the present embodiment, the first enlarged diameter portion 52 is configured to include two first annular grooves 52M, but may be configured to include only one first annular groove 52M, or three or more. It may be a configuration.

As shown in FIG. 4, the joint member 10 includes a connecting cylinder portion 11 and a clip 30. The connecting cylinder portion 11 and the clip 30 are made of a thermoplastic resin. The connection cylinder portion 11 is preferably made of a soft polyvinyl chloride resin, a hard polyvinyl chloride resin, a polyolefin resin or the like, and the clip 30 is preferably made of a polyamide resin such as a polyacetal resin or nylon 66. .. The connection cylinder portion 11 is connected to the drain discharge port 110A or the drain drain pipe 111 (see FIG. 1) by being connected to the L-shaped curved elbow portion 12 and one open end of the elbow portion 12. It includes an end portion 13 and an outer fitting portion 14 (see FIG. 2) that is connected to the other open end of the elbow portion 12 and fits into the small diameter tubular portion 51 of the pipe body 50 from the outside. In the joint member 10 and the pipe connection structure 100 of the present embodiment, the side on which the connection end portion 13 is arranged is appropriately referred to as a front side, and the side opposite to the connection end portion 13 is appropriately referred to as a back side.

As shown in FIG. 5, the outer fitting portion 14 has a structure in which the portion opposite to the elbow portion 12 has a stepped diameter expansion, and the opening of the diameter expansion portion 14K is in the connection cylinder portion 11. It is an insertion port 11A into which the tube body 50 is inserted. A C-shaped peripheral groove 15 is formed on the outer peripheral surface of the diameter-expanded portion 14K. The non-formed portion of the peripheral groove 15 in the diameter-expanded portion 14K is arranged so as to face the front side (the side on which the connecting end portion 13 is arranged). In the present embodiment, in the connection cylinder portion 11, the side closer to the insertion port 11A is referred to as the upper side, the side far from the insertion port 11A is appropriately referred to as the lower side, and the side close to the insertion port 11A in the clip 30 is referred to as the upper surface side. , The side far from the insertion port 11A will be appropriately referred to as the lower surface side.

A plurality of communication holes 16 for communicating the inside of the outer fitting portion 14 and the peripheral groove 15 are formed through the groove bottom wall 15H of the peripheral groove 15. The communication hole 16 extends in the circumferential direction of the outer fitting portion 14, and is arranged close to one or the other in the groove width direction of the peripheral groove 15 (that is, the central axial direction of the outer fitting portion 14) on the groove bottom wall 15H. ing. A pair of communication holes 16 are provided so as to face each other in the radial direction of the outer fitting portion 14, and the pair of communication holes 16 and 16 facing each other are connected when viewed from the central axis direction of the outer fitting portion 14. It is orthogonal to the extending direction of the end portion 13 (see FIG. 7). In the present embodiment, the communication holes 16 are provided with a pair so as to face each other in the radial direction, but a pair may be provided so as to be offset from the positions facing each other in the radial direction, or the communication holes 16 may be provided so as to face each other in the radial direction. May be provided in two or more pairs. Further, only one or three or more communication holes 16 may be provided.

The overhanging protrusion 17 projects outward in the radial direction of the outer fitting portion 14 from the portion of the enlarged diameter portion 14K of the outer fitting portion 14 that is farther from the insertion port 11A than the peripheral groove 15. The overhanging protrusion 17 is arranged on the back surface side of the connecting cylinder portion 11 (that is, the side opposite to the non-formed portion of the peripheral groove 15).

From the tip of the overhanging protrusion 17, the dropout control claw 21 projects substantially vertically toward the upper side (insertion port 11A side). The dropout control claws 21 are a support projecting piece 22 extending substantially vertically upward from the tip end portion of the overhanging projecting portion 17, and an outer fitting portion 14 (specifically, a diameter-expanded portion 14K) from the tip end portion of the support projecting piece 22. ), And a locking projection 23 protruding in the direction approaching). The length of the support projecting piece 22 is longer than the groove width of the peripheral groove 15, and the tip portion of the locking projection 23 has a tapered shape in which the surface facing upward is formed in a tapered shape. .. Here, the distance between the upper surface of the overhanging protrusion 17 and the lower surface of the locking projection 23 is set to be substantially the same as or larger than the height of the ring portion 31 of the clip 30 in the axial direction.

As shown in FIGS. 6A and 6B, the clip 30 is formed so as to be openable and closable in the circumferential direction. Specifically, the clip 30 includes a C-shaped ring portion 31 and a pair of connecting arms 35 and 35 extending from both ends of the ring portion 31 so as to approach each other. A ring-closed state in which the connecting arms 35 and 35 overlap in the circumferential direction of the ring portion 31 (see FIG. 7) and a ring-opened state in which a gap is formed between the pair of connecting arms 35 and 35 (FIG. 8 (A)). See). As shown in FIG. 7, the inner diameter of the ring portion 31 is substantially the same as the outer diameter of the portion where the peripheral groove 15 is formed in the outer fitting portion 14, and the ring portion 31 is fitted into the peripheral groove 15. Will be done. The pair of connecting arms 35, 35 are formed in an arc shape and communicate with both ends of the ring portion 31 from the outside, and are connected to the weir portion 15S sandwiched between the peripheral grooves 15 in the circumferential direction of the outer fitting portion 14 from the outside. Can be stacked. In the present embodiment, the distance between the tip of the locking projection 23 of the dropout control claw 21 and the outer peripheral surface of the outer fitting portion 14 is larger than the wall thickness of the ring portion 31, and the clip 30 (Ring portion 31) can be easily passed through the gap between the dropout restricting claw 21 and the outer fitting portion 14. The distance between the tip of the locking projection 23 of the drop-off control claw 21 and the outer peripheral surface of the outer fitting portion 14 may be configured to be substantially the same as or narrower than the wall thickness of the ring portion 31. Even if the above-mentioned interval is the same as the wall thickness of the ring portion 31, the surface of the tip portion of the locking projection 23 facing upward is formed in a tapered shape, so that the clip 30 is pushed downward and the above-mentioned gap is formed. Can be easily passed through. Further, even if the interval is narrower than the wall thickness of the ring portion 31, the drop-off control claw 21 formed of the thermoplastic resin has flexibility, so that the drop-off control claw 21 is pushed when the clip 30 is pushed downward. It is possible to incline the outer fitting portion 14 to the outside, and the clip 30 can be passed through the above-mentioned gap.

As shown in FIGS. 6A and 7, a pair of engaging protrusions 32, 32 are provided on the inner peripheral surface of the ring portion 31 toward the center of the ring portion 31. The pair of engaging protrusions 32, 32 are formed in an arc shape extending along the ring portion 31 so as to correspond to the communication hole 16 of the outer fitting portion 14 and face each other in the radial direction of the ring portion 31. Have been placed. Then, with the ring portion 31 fitted in the peripheral groove 15, the pair of engaging protrusions 32, 32 are fitted into and engaged with the pair of communication holes 16, 16. Here, the amount of protrusion of the engaging protrusion 32 is larger than the wall thickness of the groove bottom wall 15H of the peripheral groove 15, and the engaging protrusion 32 plunges into the outer fitting portion 14. (See FIG. 7).

As shown in FIGS. 6A and 6B, the pair of engaging protrusions 32, 32 is one side of the upper and lower surfaces of the ring portion 31 (that is, one side in the central axial direction of the ring portion 31). It is arranged closer to the side) so that it does not fit into the pair of communication holes 16 and 16 when the directions of the upper and lower surfaces of the ring portion 31 are reversed. Further, the inner peripheral portion of each engaging protrusion 32 (the tip of the engaging protrusion 32 in the protruding direction) is formed in a tapered shape in which one side of the upper and lower surfaces of the ring portion 31 is formed in a tapered shape. Then, in the inner peripheral portion of the engaging protrusion 32, the surface facing one side of the upper and lower surfaces of the ring portion 31 is directed toward the center side of the ring portion 31, and the tip inclined surface 32K toward the other side of the upper and lower surfaces of the ring portion 31. It has become.

More specifically, as shown in FIG. 7, a portion of the inner peripheral surface of the engaging protrusion 32 opposite to the opening / closing portion of the ring portion 31 is R-chamfered. This facilitates the insertion of the engaging protrusion 32 into the communication hole 16. Further, the engaging protrusion 32 includes a protrusion 32T that protrudes from the inner peripheral portion thereof toward the opening / closing portion of the ring portion 31. As a result, the engaging protrusion 32 inserted into the communication hole 16 is less likely to come off from the communication hole 16. The engaging protrusion 32 may have a configuration that does not have the protrusion 32T.

As shown in FIGS. 6A and 6B, a projecting piece 36 is provided at the tip of the connecting arm 35, and a locking projection 37 is formed at the tip of the projecting piece 36. There is. Specifically, in one of the pair of connecting arms 35, 35, the projecting piece 36 is arranged closer to the center side of the ring portion 31, and the locking projection 37 faces the outside of the ring portion 31. Is protruding. On the other hand, in the other connecting arm 35, the projecting piece 36 is arranged close to the outside of the ring portion 31, and the locking projection 37 projects toward the center side of the ring portion 31. When the clip 30 is in the ring-closed state, the pair of projecting pieces 36, 36 overlap each other in the circumferential direction of the ring portion 31, and the pair of locking projections 37, 37 lock each other (see FIG. 7). ). When the pair of locking projections 37, 37 are disengaged from each other, the pair of connecting arms 35, 35 are separated from each other to form a gap between the pair of connecting arms 35, 35, and the clip 30 is opened. It becomes a state (see FIG. 8 (A)). In the present embodiment, the clip 30 is easily held in the ring-closed state by locking the pair of locking projections 37, 37 to each other.

As shown in FIG. 8B, when the clip 30 is in the ring-opened state, the weir portion 15S of the outer fitting portion 14 covered by the pair of connecting arms 35, 35 when the clip 30 is in the ring-closed state is removed. It is exposed through the gap between the pair of connecting arms 35, 35. Here, the weir portion 15S is colored differently from the pair of connecting arms 35 and 35 (in FIG. 8B, the weir portion 15S is colored gray to indicate the difference in color. There is.). This makes it easier for the operator to recognize whether or not a gap is formed between the pair of connecting arms 35 and 35, that is, whether the clip 30 is in the closed ring state or the open ring state. The connecting cylinder portion 11 is preferably made of a transparent or translucent thermoplastic resin in order to facilitate confirmation of the connection state with the pipe body 50. In this case, the outer circumference of the weir portion 15S is formed. A seal or tape may be attached to the surface.

As shown in FIGS. 6A and 6B, the clip 30 is provided with a retaining arm 41 extending substantially perpendicular to the central axis direction of the ring portion 31. Specifically, the clip 30 has an overhanging portion 33 projecting outward from the ring portion 31 and a bank portion 44 projecting from the tip end portion of the overhanging portion 33 in the projecting direction to one side of the upper and lower surfaces of the ring portion 31. And an outer protrusion 45 extending radially outward from the bank portion 44, and the retaining arm 41 is provided on one side of the upper and lower surfaces of the ring portion 31 from the outer protrusion 45. That is, it protrudes in the same direction as the protruding direction of the bank portion 44 from the overhanging portion 33).

A pair of overhanging portions 33 are provided, and are arranged so as to sandwich the ring portion 31 between each overhanging portion 33 and the engaging protrusion portion 32. Therefore, the pair of retaining arms 41, 41 provided corresponding to the pair of overhanging portions 33, 33 face each other in the radial direction of the ring portion 41. The retaining arm 41 has an arm body 42 that stands up from the overhanging portion 33 and has a flat plate shape in the radial direction of the ring portion 31, and a hook that protrudes from the tip end portion of the arm body 42 toward the central axis of the ring portion 31. It is composed of a stop protrusion 43. As shown in FIG. 9, a claw for locking with the large diameter tubular portion 56 of the tubular body 50 is provided at the tip of the locking projection 43, and the length of the arm body 42 is the large diameter of the tubular body 50. It is slightly longer than the axial length of the tubular portion 56. In the present embodiment, one pair (two) of the retaining arms 41 are provided so as to face each other in the radial direction, but one pair may be provided so as to be offset from the positions facing each other in the radial direction. Further, the configuration may be such that only one or three or more retaining arms 41 are provided.

Further, in the present embodiment, the retaining arm 41 is formed so as to stand up substantially vertically from the outer protrusion wall 45 of the clip 30, but as shown in FIG. 10, the outer protrusion wall 45 of the clip 30 is formed. It may be formed so as to project outward from the clip 30 in the radial direction. In this case, in order to erect the retaining arm 41 in the direction of the central axis of the clip 30, a notch 41K may be provided between the arm body 42 of the retaining arm 41 and the outer protrusion wall 45 to form a hinge. Even with such a configuration, the retaining arm 41 can be locked with the large-diameter tubular portion 56 by the claw at the tip of the locking projection 43 of the retaining arm 41.

As shown in FIG. 2, in the pipe connection structure 100 of the present embodiment, the small diameter tubular portion 51 of the tubular body 50 is inserted into the outer fitting portion 14 of the connecting tubular portion 11 of the joint member 10, and the engaging protrusion 32 The portion of the outer fitting portion 14 that protrudes inside engages with the second annular groove 53M of the small diameter tubular portion 51. Then, the tubular body 50 is prevented from coming off from the connecting tubular portion 11 by the engagement between the engaging protrusion 32 and the second annular groove 53M. The outer fitting portion 14 and the small diameter tubular portion 51 are sealed by an O-ring (not shown) mounted on the first annular groove 52M. Here, the surface of the outer fitting portion 14 facing upward of the enlarged diameter portion 14K (insertion port 11A) and the tip end portion (upper end surface) of the support projecting piece 22 of the dropout control claw 21 are arranged at the same vertical position. Or, it is configured so that the tip end portion of the support projecting piece 22 is arranged on the lower side. Therefore, when the pipe body 50 is inserted into the outer fitting portion 14, interference between the dropout control claw 21 and the flange portion 55 is prevented, the pipe body 50 can be easily inserted, and the pipe body 50 can be easily inserted even after the insertion. No extra stress is generated between the body 50 and the connecting cylinder portion 11, and the connected state can be maintained satisfactorily.

Here, in the present embodiment, even when the ring portion 31 of the clip 30 is fitted in the peripheral groove 15 of the outer fitting portion 14, the tubular body 50 is fitted to the outer fitting portion 14 as described below. It can be inserted. That is, in the state where the ring portion 31 is fitted in the peripheral groove 15, the engaging protrusion 32 of the clip 30 is pushed into the inside of the outer fitting portion 14. When the pipe body 50 is inserted into the outer fitting portion 14, the tip portion of the pipe body 50 (specifically, the second enlarged diameter portion 53) comes into contact with the tip inclined surface 32K of the engaging protrusion 32. The second diameter-expanded portion 53 can be inserted further into the outer fitting portion 14 while pushing the ring portion 31 outward due to the contact with the tip inclined surface 32K. The ring portion 31 expanded by inserting the second enlarged diameter portion 53 is restored by its own elastic force when the engaging protrusion 32 is arranged in the second annular groove 53M.

In the pipe connection structure 100, the arm body 42 of the retaining arm 41 is superposed on the large-diameter cylinder portion 56 from the outside, and the locking projection 43 is locked to the base end edge of the large-diameter cylinder portion 56 of the pipe body 50. Then, by locking the locking projection 43 to the large-diameter tubular portion 56, the outer fitting portion 14 of the connecting tubular portion 11 and the flange portion 55 of the tubular body 50 are brought into close contact with each other, and between the connecting tubular portion 11 and the tubular body 50. It is possible to prevent a connection failure such as a gap in the flange.

By the way, in the drain pipe 112, the pipe body 50 may be removed from the joint member 10 for an airtightness test, maintenance, or the like even after installation. Specifically, the retaining arm 41 is removed from the large-diameter tubular portion 56 of the tubular body 50, the clip 30 is changed from the closed ring state to the open ring state, and the engaging protrusion 32 is removed from the communication hole 16. At this time, as shown in FIG. 8A, the engaging protrusion 32 rides on the groove bottom wall 15H of the peripheral groove 15, and the ring portion 31 is displaced toward the back surface side of the connecting cylinder portion 11. Here, since the support projecting piece 22 of the drop-off restricting claw 21 is arranged on the back side of the ring portion 31, the ring portion 31 is restricted from coming off to the back side of the outer fitting portion 14. Further, in the state shown in FIG. 8A, the ring portion 31 is located between the overhanging protrusion 17 and the locking projection 23 (see FIG. 2) of the dropout restricting claw 21 in the axial direction of the outer fitting portion 14. Since it is sandwiched, the ring portion 31 is restricted from coming off in the axial direction of the outer fitting portion 14. As a result, the clip 30 can be prevented from falling off or being lost from the outer fitting portion 14.

In addition, in this embodiment, it is possible to obtain the same action and effect as described above even with the following configuration.

(1) The clip 30 may not include a pair of connecting arms 35, 35. In this case, the ring portion 31 is preferably formed, for example, in a shape in which both ends of the C-shape are bent outward (see the ring portion 31W in FIG. 13). When the clip 30 does not include a pair of connecting arms 35, 35, the peripheral groove 15 may be formed over the entire circumference.

(2) The clip 30 may not be provided with the retaining arm 41. In this case, the ring portion 31 does not include the overhanging portion 33.

(3) The overhanging protrusion 17 may be arranged above the peripheral groove 15 in the outer fitting portion 14. In this case, the support projecting piece 22 projects downward from the tip of the overhanging projecting portion 17.

(4) In the connection cylinder portion 11, the non-formed portion of the peripheral groove 15 may be arranged on the back surface side of the connection cylinder portion 11, or may be arranged on the front surface and the side surface side intersecting the back surface. In the former case, the overhanging protrusion 17 is arranged on the front side of the connecting cylinder portion 11, and in the latter case, the overhanging protrusion 17 is arranged at a position facing the non-formed portion of the peripheral groove 15.

(5) The communication hole 16 may be formed in the central portion of the peripheral groove 15 in the width direction. Even with this configuration, once the clip 30 is attached to the connection cylinder portion 11, the clip 30 is unlikely to fall off from the connection cylinder portion 11, so that the clip 30 rotates during an airtightness test, maintenance, or the like. Even if it is removed from the groove 15, the tip inclined surface 32K of the engaging protrusion 32 does not face the side opposite to the insertion port 11A.

(6) The connection cylinder portion 11 of the present embodiment is formed in an L shape having an elbow portion 12, but may be formed in an I shape with the elbow portion 12 as a socket portion.

[Reference Embodiment 1]
As shown in FIGS. 11 to 13, the joint member 10V of the reference embodiment 1 has a configuration in which the joint member 10 of the above-described first embodiment does not include the dropout control claw 21 and the retaining arm 41. Specifically, the connecting cylinder portion 11V of the joint member 10V is configured not to include the overhanging protrusion portion 17. Further, in the clip 30V of the joint member 10V, the ring portion 31V is configured not to include the overhanging portion 33. Since the joint member 10V and other configurations of the pipe connection structure 100V including the joint member 10V have the same configuration as the joint member 10 and the pipe connection structure 100 of the first embodiment, the description thereof will be omitted by adding the same reference numerals.

In the reference embodiment 1, the following problems can be solved. That is, in the joint member of Patent Document 1 (Japanese Unexamined Patent Publication No. 2011-106694), when the clip is not properly attached to the connecting cylinder portion and floats from the connecting cylinder portion, the clip does not engage with the annular groove. The tube body comes off from the connection tube. Further, in the joint member of Patent Document 1, there is a problem that it is difficult for the operator to grasp whether or not the clip is correctly attached to the connecting cylinder portion.

According to the configuration of the reference embodiment 1, the operator is made to recognize whether or not the clip 30 is fitted into the peripheral groove 15 depending on whether or not a gap is formed between the pair of connecting arms 35 and 35. This makes it possible to prevent an engagement failure in which the clip 30 does not fit into the peripheral groove 15 and the engaging protrusion 32 does not engage with the peripheral groove 15. Moreover, the weir portion 15S (see FIG. 13B) exposed from the gap between the pair of connecting arms 35, 35 when the clip 30 is in the ring-opened state is different from the pair of connecting arms 35, 35. Since it is colored, it is easy for the operator to recognize whether or not a gap is formed between the pair of connecting arms 35, 35. In FIG. 13 (B), as in FIG. 8 (B), the weir portion 15S is grayed out to show the difference in color from the pair of connecting arms 35 and 35.

It can be said that the joint member 10 of the first embodiment and the joint member 10V of the reference embodiment 1 include the following feature A as a technical means for solving the above-mentioned problems.
<Feature A>
The connection cylinder part where the pipe body to be connected is inserted inside,
A clip that fits into the peripheral groove formed on the outer peripheral surface of the connection cylinder and can be opened and closed in the circumferential direction.
A communication hole formed through the bottom wall of the peripheral groove and
An engaging protrusion that protrudes from the inner peripheral surface of the clip, enters the inside of the connecting cylinder through the communication hole, and engages with an engaging groove formed on the outer peripheral surface of the pipe body. In the joint member with
The clip has a ring portion that is C-shaped and includes the engaging protrusion, and a pair of connecting arms that extend from both ends of the ring portion so as to approach each other. A joint member that changes between an open state in which a gap is formed between the connecting arms of the above and a closed state in which the pair of connecting arms overlap.

[Reference Embodiment 2]
As shown in FIGS. 14 and 15, the joint member 10W of the reference embodiment 2 does not include the dropout control claw 21 and the pair of connecting arms 35 and 35 in the joint member 10 of the first embodiment described above. It is a thing. Specifically, the connecting cylinder portion 11W of the joint member 10W is configured not to include the overhanging protrusion portion 17. Further, in the clip 30W of the joint member 10W, the ring portion 31W is formed in a shape in which both ends of the C-shape are bent outward. Since the joint member 10W and the other configurations of the pipe connection structure 100W including the joint member 10W have the same configuration as the joint member 10 and the pipe connection structure 100 of the first embodiment, the description thereof will be omitted by adding the same reference numerals. ..

According to the pipe connection structure 100W provided with the joint member 10W of the reference embodiment 2, the following problems can be solved. That is, in the pipe connection structure of Patent Document 1 (Japanese Unexamined Patent Publication No. 2011-106694), even if the clip is in a state where the pipe body is prevented from coming off, there is a connection failure that a gap is generated between the connection cylinder portion and the pipe body. There was a problem that it happened.

According to the configuration of Reference Embodiment 2, the retaining arm 41 formed on the clip 30W is locked to the end edge of the large-diameter tubular portion 56 of the tubular body 50 (see FIG. 15B), whereby the connecting tubular portion is formed. It is possible to prevent a poor connection such that a gap is formed between the 11W and the pipe body 50. Moreover, since the tubular body 50 is fixed to the end of the drain hose 120 whose outer side of the hose portion 121 is covered with the heat insulating material 122, the hose is connected to the small diameter tubular portion 51 inserted into the hose portion 121. The retaining arm 41 can be locked to the large-diameter tubular portion 56 that sandwiches the portion 121 and the heat insulating portion 122 (see FIG. 15 (A)).

It can be said that the pipe connection structure 100 of the first embodiment and the pipe connection structure 100W of the reference embodiment 2 include the following feature B as a technical means for solving the above-mentioned problems.
<Feature B>
A pipe body fixed to the end of a drain hose whose outside of the hose is covered with a heat insulating material, and a connection cylinder part connected to a drain discharge port or a drain drain pipe and into which the tip of the pipe body is inserted. , A pipe joint structure including a clip that is fitted to the connection cylinder portion from the outside and connects the connection cylinder portion and the pipe body.
The pipe body includes a small-diameter tubular portion into which a base end portion is inserted into the hose portion, a flange portion that projects outward from the intermediate portion of the small-diameter tubular portion and is abutted against the end of the drain hose, and the flange portion. A large-diameter cylinder portion extending from the outer edge portion toward the base end side of the small-diameter cylinder portion and sandwiching the hose portion and the heat insulating material between the small-diameter cylinder portion is provided.
A pipe connection structure in which the clip is formed with a retaining arm extending in the axial direction of the connection cylinder portion and engaging with the base end edge of the large diameter cylinder portion.

10 Joint member 11 Connection cylinder part 15 Circumferential groove 15S Weir part 16 Communication hole 17 Overhanging protrusion 21 Dropout regulation claw 30 Clip 31 Ring part 32 Engaging protrusion 35 Connecting arm 41 Retaining arm 100 Pipe connection structure

Claims (9)

The connection cylinder part where the pipe body to be connected is inserted inside,
A clip that fits into the peripheral groove formed on the outer peripheral surface of the connection cylinder and can be opened and closed in the circumferential direction.
A communication hole formed through the bottom wall of the peripheral groove and
An engaging protrusion that protrudes from the inner peripheral surface of the clip, enters the inside of the connecting cylinder through the communication hole, and engages with an engaging groove formed on the outer peripheral surface of the pipe body. In the joint member with
The connection cylinder portion is subject to a dropout regulation that locks the clip when the engagement protrusion is disengaged from the communication hole and rides on the groove bottom wall to prevent the clip from being disengaged from the connection cylinder portion. A joint member in which the claws are integrally formed. The connecting cylinder portion has an overhanging protrusion portion that projects outward from a portion displaced from the peripheral groove in the axial direction.
The dropout control claws include a support protrusion extending from the overhanging protrusion along the axial direction of the connection cylinder, and a locking projection protruding from the tip of the support protrusion in a direction approaching the connection cylinder. The joint member according to claim 1. The circumferential groove is formed in a C shape.
The joint member according to claim 2, wherein the overhanging protrusion is arranged on the side opposite to the non-formed portion of the peripheral groove in the circumferential direction of the connecting cylinder portion. The clip has a tip inclined surface at the tip of the engaging protrusion that faces the insertion port side of the connection cylinder portion into which the tubular body is inserted and moves away from the insertion port as it approaches the center of the clip. The joint member according to any one of claims 1 to 3. The engaging protrusion is arranged so as to be close to one side or the other side in the central axis direction of the clip.
The joint member according to claim 4, wherein the communication hole is arranged so as to correspond to the engaging protrusion and to be closer to one side or the other side in the groove width direction of the groove bottom wall of the peripheral groove. The clip has a ring portion having a C shape and having the engaging protrusion, and a pair of connecting arms extending from both ends of the ring portion so as to approach each other. The invention according to claim 1, wherein the ring-opening state in which a gap is formed between the pair of connecting arms and the ring-closing state in which the pair of connecting arms overlap each other change. Joint member. 6. The portion of the connecting cylinder that is exposed from the gap between the pair of connecting arms when the clip is in the ring-opened state is colored differently from that of the pair of connecting arms. The joint member described in. The joint member according to claim 6 or 7, wherein the pair of connecting arms is provided with locking projections that lock each other when the ring is closed. A pipe connection structure including the joint member according to claim 1 of any one of claims 1 to 8 and the pipe body.
The pipe body is fixed to the end portion of a drain hose whose outside of the hose portion is covered with a heat insulating material, and the tip portion is inserted into the connection cylinder portion and the base end portion is inserted into the hose portion. The small-diameter cylinder, the flange portion that projects outward from the middle portion of the small-diameter cylinder portion and is abutted against the end of the drain hose, and the small-diameter cylinder that extends from the outer edge portion of the flange portion to the base end side of the small-diameter cylinder portion. A large-diameter tubular portion that sandwiches the hose portion and the heat insulating material is provided between the portions.
A pipe connection structure in which the clip is formed with a retaining arm extending in the axial direction of the connection cylinder portion and engaging with the base end edge of the large diameter cylinder portion.

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