JP2023115373A - Female side pipe joint, pipe joint and annular cover - Google Patents

Abstract

To easily check whether female and male pipe joints are locked or not.SOLUTION: A female side pipe joint 10 is fixed to an end part of a pipe, and is connected to a male side pipe joint 50 of another pipe. Also, this female side pipe joint 10 comprises: a fitting cylinder part 14 fitted to the outside of a fitting pipe part 51Y of the male side pipe joint 50; a communication hole 16 formed in the fitting cylinder part 14, and facing an outer peripheral groove 53M of the fitting pipe part 51Y when the fitting cylinder part 14 is fitted to a regular fitting position of the fitting cylinder part 51Y; a clip 30 mounted on the outside of the fitting cylinder part 14, and engaging with the outer peripheral groove 53M through the communication hole 16; and an engaging arm 71 that on condition that the fitting cylinder part 14 is arranged at the regular fitting position, engages with an engaged part of the male side pipe joint 50 in a state of overlapping the outside surface of the male side pipe joint 50.SELECTED DRAWING: Figure 2

Description

The present invention includes a female pipe joint that is fixed to the end of a pipe and coupled to a male pipe joint of a mating pipe, and the female pipe joint and the male pipe joint (hereinafter, appropriately referred to as "male and female pipe joints"). ) and an annular cover used for the pipe fitting.

As a conventional pipe joint, when the female pipe joint is fitted to the outside of the male pipe joint, the communication hole of the female pipe joint faces the outer peripheral groove of the male pipe joint, It is known that a clip to be attached is engaged with an outer peripheral groove through a communication hole so that the male and female pipe joints are locked so as to be locked (see Patent Document 1).

JP 2011-106604 A (paragraph [0029], FIGS. 3 and 4)

However, in the above-described conventional pipe joints, the appearance of the locked state and the unlocked state in which the male and female pipe joints are not retained and are half-fitted are similar in appearance. It is difficult to confirm whether or not there is a problem, and countermeasures are required.

A first aspect of the invention, which has been made to solve the above-mentioned problems, is a female pipe joint that is fixed to the end of a pipe and coupled to a male pipe joint of a mating pipe, in which the male pipe joint is fitted. and a fitting tube portion formed in the fitting tube portion that is fitted to the outside of the fitting tube portion, and the fitting tube portion is fitted to a normal fitting position of the fitting tube portion. a communicating hole facing the outer peripheral groove of the connecting pipe portion; a clip mounted on the outside of the fitting cylinder portion and engaged with the outer peripheral groove through the communicating hole; and an engaging arm that engages with the engaged portion of the male side pipe joint in a state of overlapping with the outer surface of the male side pipe joint on the condition that it is arranged.

According to the invention of claim 2, the clip is fitted to the outside of the fitting tube portion, is positioned when it slides toward the distal end side of the fitting tube portion and reaches a regular slide position, and is fitted to the outside of the clip. provided that the engaging arm is provided on the annular cover and the annular cover is arranged at the normal sliding position. The female side pipe joint according to claim 1, which engages with the engaged portion.

The invention according to claim 3 is the female side pipe joint according to claim 2, wherein the annular cover is provided with a visual confirmation hole which overlaps a part of the clip when arranged at the normal slide position.

The invention of claim 4 is the female side pipe joint according to claim 2 or 3, wherein the clip is provided with a stopper for positioning the annular cover at the normal slide position.

The invention of claim 5 is the female side pipe joint according to claim 1, wherein the engagement arm is provided on the clip.

In the sixth aspect of the invention, the engaging arm is rotatably supported, and the engaging arm that is not engaged with the engaged portion is held in a posture away from the outer surface of the male pipe joint. A female side pipe joint according to any one of claims 1 to 5, comprising an elastic hinge portion.

In the invention according to claim 7, a strip-shaped plate portion extending laterally from the female side pipe joint and a groove portion crossing a midway position in the longitudinal direction of the strip-shaped plate portion are provided. 7. The female side pipe joint according to claim 6, wherein the engaging arm is formed, and the thin portion of the bottom of the groove portion of the belt-shaped plate portion forms the elastic hinge portion.

The invention of claim 8 is a pipe joint comprising the female pipe joint according to any one of claims 1 to 7 and the male pipe joint to which the female pipe joint is coupled. be.

In the invention of claim 9, the male side pipe joint includes an insertion pipe portion inserted inside a drain hose as the mating pipe, the outer side of which is covered with a heat insulating material, and an insertion pipe portion that is fitted to the outside of the drain hose. 9. The piping joint according to claim 8, further comprising a hood portion, wherein the engaging arm is engaged at an arbitrary position on the entire periphery of the distal end portion of the hood portion.

The invention according to claim 10 is the pipe joint according to claim 9, wherein the engaging arm is provided with a hook portion that enters and engages with the tip portion of the receptacle.

The invention of claim 11 is the pipe joint according to any one of claims 8 to 10, wherein the color of the engaging arm is different from the color of the outer surface of the male side pipe joint.

According to the twelfth aspect of the invention, when the tubular fitting portion of the female side pipe joint is fitted to the normal fitting position outside the fitting tubular portion of the male side pipe joint, the communicating hole of the fitting tubular portion is opened. An annular cover for a pipe joint in which a clip attached to the outside of the fitting tube portion and facing the outer peripheral groove of the fitting tube portion engages with the outer peripheral groove through the communicating hole, wherein the fitting tube The clip is formed to be fitted to the outside of the clip, is positioned when it slides toward the tip side of the fitting cylinder and reaches the normal sliding position, and is fitted to the outside of the clip. Provided that the fitting cylindrical portion is arranged at the normal fitting position and the annular cover is arranged at the normal sliding position, the engagement arm is provided integrally with the outer surface of the male side pipe joint. It is an annular cover that engages with the engaged portion of the male side pipe joint in a state of being superimposed on.

According to the structures of claims 1 and 8, when the fitting tube portion of the female side pipe joint is fitted to the proper fitting position of the fitting pipe portion of the male side pipe joint, the outer circumferential groove of the fitting pipe portion , and the clip on the outer side of the fitting cylinder engages with the outer peripheral groove through the communication hole, so that the male and female pipe joints are locked to prevent them from slipping off. Further, the female side pipe joint is provided with an engaging arm that engages with the engaged portion of the male side pipe joint on condition that the fitting cylindrical portion is arranged at the normal fitting position. Accordingly, it is possible to confirm whether or not the male and female pipe joints are locked by confirming whether or not the engaging arm is engaged with the engaged portion. In addition, since the engaging arm engages the engaged portion while overlapping the outer surface of the male pipe joint, whether or not the engaging arm engages with the engaged portion does not affect the engagement. Differences in whether or not the mating arm overlaps the outer surface of the male side piping joint, or differences in the amount of overlap between them, make it easier to check whether the male and female piping joints are locked or not. can.

In the configuration of claim 2, the annular cover fitted to the fitting tubular portion of the female side pipe joint slides toward the distal end of the fitting tubular portion and is positioned when it reaches the normal sliding position, and the clip to strengthen the aforementioned locked state. Since the engaging arm engages the engaged portion on condition that the annular cover is arranged at the normal sliding position, it is confirmed whether or not the engaging arm is engaged with the engaged portion. Therefore, it is possible to easily confirm whether or not the locked state exists and confirm whether or not the locked state is strengthened at the same time.

It should be noted that the annular cover of claim 12 can be attached to a female piping joint that does not have an annular cover, or it can be replaced with an annular cover that does not have an engaging arm and the annular cover of claim 12 can be attached to the female piping joint. If so, the same effect as the configuration of claim 2 can be obtained.

In the structure of claim 3, whether or not there is a clip inside the annular cover can be easily confirmed by checking whether or not a part of the clip is visually recognized inside or on the far side of the visual confirmation hole of the annular cover. can do.

In the configuration of claim 4, since the clip is provided with a stopper for positioning the annular cover at the normal sliding position, the annular cover is not positioned at the normal sliding position when the clip is disengaged from the fitting tube portion. Detachment of the clip can be noticed.

The engagement arm may be provided on the clip (invention of claim 5). In that case, it may or may not have an annular cover. Further, the engagement arm may be provided at a portion of the female pipe joint other than the clip and the annular cover. Further, an engaging arm is provided on the male side pipe joint so that "on the condition that the fitting cylindrical portion is arranged at the normal fitting position, the female side pipe is attached to the female side pipe while overlapping the outer surface of the female side pipe joint." It is also conceivable to adopt a configuration of "engaging with the engaged portion of the joint".

In the structure of claim 6, when the engaging arm is not engaged with the engaged portion, the male and female piping joints are separated from the outer surface of the male side piping joint in the posture of the engaging arm. is in the locked state or not can be easily and clearly determined.

According to the structure of claim 7, it is possible to easily manufacture the female side pipe joint provided with the engagement arm.

By using the pipe joint of claim 9, it is possible to easily perform the work of confirming the connection of the pipe joint of the drain hose, which is often arranged in a dark place or a narrow place.

In the structure of claim 10, the hook portion of the engaging arm enters and engages the tip portion of the receptacle, thereby stabilizing the engaged state.

In the structure of claim 11, since the color of the engaging arm is different from the color of the outer surface of the male side pipe joint, it is clear whether the engaging arm is engaged with the engaged portion.

Schematic diagram of the drain pipe of the first embodiment Side sectional view of pipe joint Perspective view of male piping joint Partial perspective view of the female side pipe joint Perspective view of fitting tube Perspective view of clip Flat cross-sectional view of the part with the clip of the female side piping joint Perspective view of a partially broken annular cover (A) Front view of the pipe joint with the annular cover positioned before the normal sliding position, (B) Front view of the pipe joint with the annular cover positioned at the normal sliding position Flat sectional view of a pipe joint in a locked state Sectional side view of a pipe fitting with the annular cover in the normal sliding position (A) Partial side sectional view of the pipe joint with the annular cover positioned at the normal sliding position, (B) Partial side sectional view of the pipe joint with the annular cover positioned before the normal sliding position Side sectional view of the pipe joint of the second embodiment The perspective view of the female side piping joint of 3rd Embodiment. Side sectional view of pipe joint Side cross-sectional view of the pipe joint of the fourth embodiment The perspective view of the female side piping joint of 5th Embodiment. Perspective view of fitting tube Perspective view of clip Side sectional view of pipe joint Flat sectional view of the female pipe joint when the clip is closed (A) Horizontal sectional view and (B) front view of the female pipe joint when the clip is in the open state Front sectional view of pipe joint The front view of the piping joint which concerns on 6th Embodiment Side sectional view of the tip portion of the engagement arm according to the modification Side sectional view of the tip portion of the engagement arm according to the modification Flat cross-sectional view of a pipe joint according to a modification

[First embodiment]
The pipe joint 100 of the first embodiment will be described below with reference to FIGS. 1 to 12. FIG. FIG. 1 shows, for example, a state in which a drain pipe 110A of an air conditioner 110 placed in the ceiling is connected to a drain facility pipe 111 of a building via a drain hose 120. As shown in FIG.

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 a heat insulating material 122 . To both end portions of the drain hose 120, for example, the male pipe joint 50 among the female pipe joint 10 and the male pipe joint 50 constituting the pipe joint 100 of the present embodiment is fixed. Then, as shown in FIG. 1, the male side pipe joints 50 at both ends of the drain hose 120 are coupled to the female side pipe joints 10 fixed to the drain pipe 110A and the drain facility pipe 111, respectively. As such, the drain pipe 110A is connected to the drain facility pipe 111. As shown in FIG.

First, the specific structure of the male side pipe joint 50 will be described below. As shown in FIG. 3, the male pipe joint 50 has a structure in which a part of the connecting pipe 51 is covered with a hood portion 50F. The hood portion 50</b>F is formed by extending a cylindrical wall 56 in one direction from the outer edge portion of a circular hose contact portion 55 projecting sideways from the intermediate portion of the connecting pipe 51 . Also, the cylindrical wall 56 of the hood portion 50</b>F is sized to just fit on the outside of the drain hose 120 .

A portion of the connecting pipe 51 that is surrounded by the hood portion 50</b>F at one end side from the hose contact portion 55 forms an insertion pipe portion 51</b>X that is inserted inside the drain hose 120 . Further, the distal end portion of the insertion tube portion 51X has a tapered shape and protrudes outward from the receptacle portion 50F. Then, for example, the drain hose 120 is attached to the hose contact portion 55 in a state in which adhesive is applied in advance to the outer peripheral surface of the insertion tube portion 51X, the inner peripheral surface of the hose portion 121, and the tip end surface of the heat insulating material 122. The insertion pipe portion 51X is inserted into the hose portion 121 to a position where the end face abuts.

The male pipe joint 50 is made of, for example, a thermoplastic resin such as a soft polyvinyl chloride resin, a hard polyvinyl chloride resin, a polyolefin resin, or the like. The thermoplastic resin forming the male pipe joint 50 may be either a transparent resin or an opaque resin. Also, the hose portion 121 of the drain hose 120 is preferably made of, for example, thermoplastic resin, such as polyolefin resin or vinyl chloride resin. It is preferable that the heat insulating material 122 is made of foamed thermoplastic resin such as polyolefin resin (for example, polyethylene resin, polypropylene resin), foamed rubber, or the like.

A fitting pipe portion 51Y to which the female pipe joint 10 is fitted is provided on the connecting pipe 51 opposite to the insertion pipe portion 51X with the hose contact portion 55 interposed therebetween. As shown in FIG. 3, a small-diameter portion 52 and a large-diameter portion 53 are provided on the outer peripheral surface of the fitting tube portion 51Y in order from the tip side, and a tapered portion 53T is formed. A pair of O-ring grooves 52M are formed in the outer peripheral surface of the small-diameter portion 52, and O-rings (not shown) are mounted thereon. Furthermore, an outer peripheral groove 53M is formed in the outer peripheral surface of the large diameter portion 53, with which a clip 30, which will be described later, engages. The outer peripheral groove 53M has a rectangular groove structure with a square cross section.

Next, a specific structure of the female side pipe joint 10 will be described below. As shown in FIG. 2, the female pipe joint 10 is formed by assembling a clip 30 and an annular cover 40 to a joint body 11 having a tubular structure. The joint body 11, the clip 30 and the annular cover 40 are made of thermoplastic resin. The colors of the joint body 11 , the clip 30 and the annular cover 40 (including colorless and transparent) are different from each other, and the color of the annular cover 40 is also different from the color of the male pipe joint 50 .

The joint main body 11 is preferably made of soft polyvinyl chloride resin, hard polyvinyl chloride resin, polyolefin resin, or the like. The clip 30 is preferably made of polyacetal resin or polyamide resin such as nylon 66. The annular cover 40 is preferably made of polyolefin resin, polyamide resin, or the like. Moreover, the thermoplastic resin forming the joint body 11, the clip 30, and the annular cover 40 may be either a transparent resin or an opaque resin. If at least the joint main body 11 is made of a transparent thermoplastic resin, the inside of the joint main body 11 can be visually confirmed from the outside, and the state of drain water flowing through the pipe can be recognized. By forming the male pipe joint 50, the clip 30, and the annular cover 40 in addition to the joint main body 11 from a transparent thermoplastic resin, it is possible to widely recognize the condition of the drain water flowing through the pipe.

As shown in FIG. 2, the joint main body 11 includes a pipe fixing portion 13 at one end of an elbow portion 12 curved in an L shape, and a fitting tubular portion 14 at the other end. Then, the drain pipe 110A or the drain facility pipe 111 (see FIG. 1) is fixed to the pipe fixing portion 13 in a fitted state, and the fitting cylinder portion 14 is fitted to the fitting pipe portion 51Y of the male side pipe joint 50 from the outside. match.

The fitting cylinder portion 14 has a large diameter portion 14K on the distal end side of an intermediate position in the axial direction, and a small diameter portion 14L on the base end side. It is getting bigger in steps. A tapered portion 14T is formed between the large-diameter portion 14K and the small-diameter portion 14L on the inner surface of the fitting cylinder portion 14 . When the tubular fitting portion 14 of the female pipe joint 10 is fitted to the outside of the tubular fitting portion 51Y of the male pipe joint 50, the tapered portion 53T of the tubular fitting portion 51Y and the tubular fitting portion 14 , the fitting tube portion 14 is positioned at the normal fitting position with respect to the fitting tube portion 51Y.

As shown in FIG. 5, the outer peripheral surface of the large diameter portion 14K is formed with a clip accommodating groove 15 having a square groove structure and having a C shape in plan view. Further, a communication hole 16 penetrating inside and outside of the fitting tube portion 14 is formed in the groove bottom wall 15</b>H of the clip accommodating groove 15 . The communication hole 16 extends in the circumferential direction of the fitting tube portion 14 and has substantially the same groove width as the outer peripheral groove 53M of the male side pipe joint 50 described above. Further, the communication hole 16 is arranged closer to one side of the clip accommodating groove 15 in the groove width direction (the distal end side of the fitting tube portion 14). Then, as shown in FIG. 11, when the fitting tube portion 14 is arranged at the aforementioned normal fitting position with respect to the fitting tube portion 51Y, the communication hole 16 is aligned with the outer peripheral groove 53M of the male side pipe joint 50. opposite. In the present embodiment, a pair of communication holes 16 are provided so as to face each other in the radial direction of the fitting cylinder portion 14, but a pair of communication holes 16 may be provided shifted from positions facing each other in the radial direction. However, two or more pairs may be provided so as to face each other in the radial direction. Also, only one or three or more communication holes 16 may be provided.

As shown in FIGS. 6A and 6B, the clip 30 is C-shaped, and a pair of projections 35 protrude laterally from both ends thereof. Moreover, the clip 30 is elastically deformable so as to widen the opening 31A between the ends of the clip 30 from the state shown in FIGS. 6(A) and 6(B). Then, the clip 30 changes between the closed state shown in FIGS. 6A and 6B and the open state in which the opening 31A is wider than the closed state. The clip 30 in the closed state has an inner diameter approximately the same as the outer diameter of the groove bottom wall 15H of the clip accommodating groove 15 in the fitting tubular portion 14 (see FIG. 7).

As shown in FIG. 7 , the pair of protrusions 35 are formed in a tapered shape that narrows in the circumferential direction of the clip 30 toward the radially outer side of the clip 30 . Specifically, the surfaces 35M1 of the pair of projections 35 facing each other in the circumferential direction of the clip 30 are formed substantially perpendicular to the circumferential direction of the clip 30, The surface 35M2 facing the opposite side is formed in an R shape that curves away from the opening 31A of the clip 30 as it goes radially inward of the clip 30 (that is, the base end side of the protrusion 35). The surface 35M2 may be formed substantially perpendicular to the circumferential direction of the clip 30, like the surface 35M1.

A pair of connecting protrusions 32 are provided on the inner peripheral surface of the clip 30 at two positions separated by 180 degrees. The pair of connecting protrusions 32 has an arcuate shape extending in the circumferential direction of the clip 30 . With the clip 30 fitted in the clip receiving groove 15 , the pair of connecting projections 32 enter the pair of communication holes 16 and protrude inside the fitting tube portion 14 . In this state, the outer peripheral surface of the clip 30 is located inside the outer peripheral surface of the large diameter portion 14K of the fitting tube portion 14, and the pair of projections 35 protrude outside the outer peripheral surface of the large diameter portion 14K.

As shown in FIGS. 6A and 6B, the pair of connecting protrusions 32 are arranged close to one side of the clip 30 in the central axis direction, and the clip 30 is turned upside down. It is arranged so as not to enter the pair of communication holes 16 in the event of a failure. A tapered tip inclined surface 32</b>K is formed on the edge of the surface facing the tip side of the fitting tube portion 14 in the tip portion of the connecting protrusion 32 . In addition, it is good also as a structure where the connection protrusion 32 does not have the front-end|tip inclined surface 32K.

As shown in FIG. 7, the connecting protrusion 32 has a protrusion 32T that protrudes from its inner peripheral portion toward the opening 31A of the clip 30. As shown in FIG. This makes it difficult for the connecting projection 32 inserted into the communication hole 16 to come off from the communication hole 16 . A portion of the inner peripheral surface of the connecting protrusion 32 opposite to the protrusion 32T is chamfered. This facilitates insertion of the connecting projection 32 into the communication hole 16 . Note that the connection protrusion 32 may be configured without the protrusion 32T.

As shown in FIG. 4, the annular cover 40 has an annular shape and integrally includes engaging arms 71 . Also, the inner diameter of the annular cover 40 is substantially the same as the outer diameter of the large diameter portion 14K of the fitting cylinder portion 14 . The annular cover 40 is fitted into the small diameter portion 14L from the distal end side of the fitting tube portion 14 before the clip 30 is housed in the clip housing groove 15 of the large diameter portion 14K. After that, the clip 30 is accommodated in the clip accommodation groove 15, and the annular cover 40 is prevented from slipping off from the fitting tube portion 14 using the pair of projections 35 as stoppers from the outer peripheral surface of the large diameter portion 14K. Hereinafter, in the annular cover 40, the side closer to the front end surface of the fitting tube portion 14 will be referred to as the "front side", and the opposite side will be referred to as the "rear side".

As shown in FIG. 8A, the annular cover 40 is formed with a pair of projection receiving portions 41 corresponding to the pair of projections 35 of the clip 30. As shown in FIG. The pair of projection receiving portions 41 are rectangular slits having openings on the front surface of the annular cover 40 as shown in FIG. 9(A). Further, as shown in FIG. 8B, a reinforcing rib 42 extending in the circumferential direction along the rear edge of the annular cover 40 is provided behind the protrusion receiving portion 41 on the outer surface of the annular cover 40. ing. Then, when the openings of the pair of projection receiving portions 41 are opposed to the pair of projections 35 and the annular cover 40 is slid from the small diameter portion 14L to the large diameter portion 14K, as shown in FIG. A pair of protrusions 35 are received in a pair of protrusion receiving portions 41 and the annular cover 40 is fitted to the outside of the clip 30 . At this time, the projection 35 abuts against the inner surface 41A of the projection receiving portion 41 as a stopper, so that the annular cover 40 is positioned at a normal sliding position with respect to the fitting cylinder portion 14, which will be described later.

As shown in FIG. 10 , the cross-sectional shape of the protrusion receiving portion 41 viewed from the axial direction of the annular cover 40 is substantially the same as the shape of the protrusion 35 viewed from the axial direction of the clip 30 . Specifically, the projection receiving portion 41 is formed in a tapered shape that narrows in the circumferential direction of the annular cover 40 toward the radially outer side of the annular cover 40 . A surface 41M1 facing the surface 35M1 of the projection 35 is formed substantially perpendicular to the circumferential direction of the annular cover 40, and a surface 41M2 facing the surface 35M2 of the protrusion 35 is separated from the surface 41M1 as it goes radially inward of the annular cover 40. It is formed in an R shape curved inward.

As shown in FIGS. 8A and 8B, an engaging protrusion 45 extending in the circumferential direction is formed on the inner peripheral surface of the annular cover 40 . The engaging protrusion 45 is arranged near the rear end of the annular cover 40 and formed in an arc shape in a region of the annular cover 40 excluding the portion where the pair of protrusion receiving portions 41 are formed. The inner diameter of the engaging projection 45 is slightly smaller than the outer diameter of the large diameter portion 14K of the fitting cylindrical portion 14, and the clip is positioned when the connecting projection 32 of the clip 30 is engaged with the outer peripheral groove 53M of the male pipe joint 50. 30 (see FIG. 12(B)). Then, when the annular cover 40 moves to a normal sliding position, which will be described later, the engaging protrusion 45 enters the clip accommodating groove 15 as shown in FIG. be.

Also, the cross-sectional triangle of the engaging projection 45 at any position in the circumferential direction is a triangle having oblique sides inclined with respect to the axial direction of the annular cover 40 on the front and rear sides. Thereby, the large-diameter portion 14K can be easily inserted inside the annular cover 40 . The cross-sectional triangle of the engaging protrusion 45 may have only the oblique side on the front side and a vertical side perpendicular to the axial direction of the annular cover 40 on the rear side. By doing so, it is possible to increase the locking force for locking the annular cover 40 at the normal slide position.

The annular cover 40 is formed with a rectangular second notch 43 that is open at the tip of the annular cover 40 , apart from the protrusion receiving portion 41 . The second notch 43 is formed at the distal end of the annular cover 40 and has a length in the axial direction of the annular cover 40 shorter than that of the protrusion receiving portion 41 . A plurality of second cutouts 43 (two in this embodiment) are provided, and a partition wall 44 is formed between the second cutouts 43 that are adjacent to each other in the circumferential direction of the annular cover 40 . .

As shown in FIG. 4, from the outer surface of the partition wall 44, a protruding arm support portion 75 protrudes laterally. The engaging arm 71 is bent at a right angle from the distal end of the arm supporting portion 75 and extends beyond the fitting tube portion 14 . The tip of the engaging arm 71 is bent at a right angle toward the center of the main body 40H of the annular cover 40 and forms a hook 73 in which a locking projection 72 protrudes from the tip toward the main body 40H. . Then, as shown in FIG. 2, when the tubular fitting portion 14 is arranged at the regular fitting position with respect to the tubular fitting portion 51Y and the annular cover 40 is arranged at the regular sliding position with respect to the tubular fitting portion 14, the engagement is achieved. With the mating arm 71 overlapping the outer surface of the hood portion 50F of the male pipe joint 50, the locking projection 72 of the hook portion 73 is locked inside the hood portion 50F, and the hook portion 73 is attached to the hood portion 50F. A tip can be engaged.

That is, the female pipe joint 10 is engaged under the condition that the fitting cylindrical portion 14 is arranged at the normal fitting position with respect to the male pipe joint 50 and the annular cover 40 is arranged at the normal sliding position. The mating arm 71 can be overlapped on the outer surface of the male pipe joint 50 and engaged with the engaged portion (tip of the hood portion 50F) of the male pipe joint 50. The arm 71 cannot be engaged with the engaged portion. Further, the hood portion 50F has a cylindrical shape, and the distance from the main body portion 40H of the annular cover 40 to the tip of the hood portion 50F is the same in the entire circumferential direction of the hood portion 50F. For example, the engaging arm 71 engages with any position in the circumferential direction of the hood portion 50F.

The description about the structure of the piping joint 100 of this embodiment is above. Next, the operation of this embodiment will be described. As shown in FIG. 1, in order to connect the male side pipe joints 50 at both ends of the drain hose 120 to the respective female side pipe joints 10 of the drain pipe 110A and the drain facility pipe 111, as shown in FIG. First, the clip 30 of the female pipe joint 10 is accommodated in the clip accommodation groove 15, and the annular cover 40 is arranged in the small diameter portion 14L of the fitting cylindrical portion 14. As shown in FIG. Then, as shown in FIG. 11, the fitting tube portion 51Y of the male side pipe joint 50 is pushed into the fitting tubular portion 14 of the female side pipe joint 10. Then, as shown in FIG. Then, the tapered portion 53T of the fitting tube portion 51Y comes into sliding contact with the distal end inclined surface 32K (see FIG. 6A) of the connecting protrusion 32, and the clip 30 is expanded and deformed. Then, when the tapered portion 53T of the fitting tube portion 51Y reaches the normal fitting position where the tapered portion 14T in the fitting tube portion 14 abuts, the connecting protrusion 32 enters the outer peripheral groove 53M, and the clip 30 is elastic. It returns to the state housed in the clip housing groove 15. - 特許庁As a result, the male and female pipe joints 10 and 50 are engaged and locked. At this time, an O-ring (not shown) provided in the O-ring groove 52M of the male pipe joint 50 seals the fitting portion of the male and female pipe joints 10 and 50 .

Next, as shown in FIG. 9A, the pair of projection receiving portions 41 of the annular cover 40 are opposed to the pair of projections 35 of the clip 30, and the annular cover 40 is slid toward the male pipe joint 50 side. Then, as shown in FIG. 9(B), the pair of protrusions 35 are received by the pair of protrusion receiving portions 41, and the protrusions 35 come into contact with the inner surfaces 41A of the protrusion receiving portions 41, whereby the annular cover 40 is opened. It is positioned in the normal slide position. 11 and 12(A), the annular cover 40 is retained at the normal slide position by the engagement between the engaging protrusion 45 and the clip receiving groove 15. As shown in FIG. Then, the annular cover 40 and the clip 30 cover the entire clip accommodating groove 15 from the outside. As a result, the expansion deformation of the clip 30 is restricted, and the aforementioned locked state is strengthened. In addition, since the annular cover 40 restricts the relative movement between the pair of protrusions 35, the clip 30 is restricted from expanding and deforming, and the locked state is strengthened.

In this state, that is, in a state in which the tubular fitting portion 14 is arranged at the normal fitting position with respect to the tubular fitting portion 51Y and the annular cover 40 is arranged at the normal sliding position with respect to the tubular fitting portion 14, the engagement arm 71 overlaps the outer surface of the hood portion 50F of the male pipe joint 50, and the outer surface of the locking projection 72 abuts the tip edge of the hood portion 50F from the side. Therefore, when the hook portion 73 is pressed toward the hood portion 50F side, the outer surface of the locking projection 72 and the hood portion 50F are in sliding contact with each other, and the locking projection 72 climbs over the tip surface of the hood portion 50F and moves inside the hood portion 50F. , and the engagement arm 71 engages with the tip of the hood portion 50F. Here, since the engaging arm 71 engages at any position in the circumferential direction of the hood portion 50F, the engaging arm 71 can be engaged without worrying about the phase of the male side pipe joint 50 with respect to the female side pipe joint 10. It can be engaged with the hood portion 50F. The above-described locked state is strengthened by the engagement of the engagement arm 71 as well. In addition, since the hook portion 73 of the engaging arm 71 enters the inside of the receptacle portion 50F for engagement, it is less likely to be affected by disturbance such as the contact of a foreign object, and the engaged state is stabilized.

By the above operation, the connection between the female pipe joint 10 and the male pipe joint 50 is completed. Then, as shown in FIG. 1 , the drain pipe 110A of the air conditioner 110 and the drain facility pipe 111 of the building can be connected via the drain hose 120 .

By the way, if the male and female pipe joints 10, 50 are not properly connected (hereinafter referred to as "misconnection"), water leakage will occur in the ceiling space. As a first example of erroneous coupling, only the portion having one O-ring groove 52M on the tip side of the fitting pipe portion 51Y of the male pipe joint 50 shown in FIG. 14L and the other O-ring groove 52M is located in the large diameter portion 14K of the fitting cylindrical portion 14, in a semi-fitted state, the friction of the O-ring (not shown) in the O-ring groove 52M on the tip side It is conceivable that the male and female pipe joints 10 and 50 are temporarily fixed by this. Further, it is conceivable that the operator misunderstands this as the fitted state and moves the annular cover 40 to the normal sliding position. In this case, since the engagement arm 71 cannot be engaged with the tip of the hood portion 50F, the operator notices that the male and female pipe joints 10, 50 are not correctly connected (that is, incorrect connection). Even if you do not notice the erroneous connection during the work, when you visually check later, the tip of the engaging arm 71 overlaps the position shifted toward the female side pipe joint 10 from the tip of the hood portion 50F, and the hook portion 73 Since the tip of the arm 71 sticks up to the outer surface of the hood portion 50F and the engaging arm 71 is lifted from the outer surface of the hood portion 50F, the erroneous connection can be easily noticed. In addition, since the engaging arm 71 and the male side pipe joint 50 are of different colors, it is possible to notice an erroneous connection even in a dark place under dim light. Furthermore, if the annular cover 40 is not placed in the normal sliding position, the entire clip 30, which has a different color than the annular cover 40, is exposed, which also makes it possible to notice misconnection. Further, as shown in FIG. 12B, when the annular cover 40 is slid halfway and is half-fitted to the outside of the clip 30, the clip 30 passes through the second notch 43 of the annular cover 40. It is visible, thereby noticing the mis-coupling.

It is conceivable that the operation of sliding the annular cover 40 to the normal sliding position is forgotten after the male and female pipe joints 10 and 50 are fitted to the normal fitting position, although this is not an erroneous connection. In this case as well, the state is the same as in the first example of the miscoupling, and it is easy to notice that the annular cover 40 is not being slid.

As a second example of erroneous connection, the male and female pipe joints 10 and 50 are fitted with the clip 30 removed, the annular cover 40 is slid to the normal sliding position, and the engagement arm 71 is moved to the hood portion 50F. It is conceivable to be engaged. However, in this case, the projection 35 of the clip 30 in the projection receiving portion 41 of the annular cover 40 cannot be visually recognized, so that the mis-coupling is noticed. Moreover, since the annular cover 40, the clip 30, and the joint main body 11 have different colors, it is easy to notice an erroneous connection.

In the present embodiment, since the annular cover 40 abuts or adjoins the hose contact portion 55 of the hood portion 50F at the normal sliding position, the hose contact portion 55 normally slides the annular cover 40 even when the clip 30 is disengaged. It can be a stopper for positioning at the slide position. On the other hand, when the clip 30 is removed, the annular cover 40 may not be positioned at the normal slide position and may move beyond the normal slide position. Then, when the clip 30 is removed, the annular cover 40 approaches the hood portion 50F side from the normal sliding position, and the hook portion 73 of the engaging arm 71 cannot engage with the tip portion of the hood portion 50F. It becomes difficult to fit together, which makes the operator aware of mis-bonding.

As described above, in the pipe joint 100 of this embodiment, it is determined whether the male and female pipe joints 10 and 50 are in the locked state by confirming whether or not the engagement arm 71 is engaged with the tip portion of the hood portion 50F. and whether or not the lock state is strengthened can be easily performed at the same time. As a result, it is possible to easily confirm the connection of the drain hose, which is often arranged in a dark place such as a ceiling space or a narrow place. Further, in the pipe joint 100 of the present embodiment, the male and female pipe joints 10 and 50 can be rotated with each other while maintaining the state in which the engagement arm 71 is engaged with the tip portion of the hood portion 50F. In other words, the pipe joint 100 of this embodiment can be used as a rotary joint, and for example, it becomes possible to easily change the posture after connecting the drain hose.

A tool such as a slotted screwdriver is inserted between the engaging arm 71 and the outer surface of the hood portion 50F to release the engagement between the engaging arm 71 and the hood portion 50F, and the annular cover 40 is removed from the male pipe joint 50. The male and female pipe joints 10 and 50 can be separated by moving away from the clip 30 and pinching the pair of projections 35 of the clip 30 to expand the diameter of the clip 30 .

[Second embodiment]
A female pipe joint 10A of this embodiment shown in FIG. 13 differs from the first embodiment in that an engaging arm 71 is rotatably supported by an arm support portion 75 via an elastic hinge portion 74. . Specifically, the annular cover 40A of the present embodiment is provided with a belt-like plate portion 71X extending laterally from the main body portion 40H, and the tip portion of the plate portion 71X serves as the hook portion 73 described above. A groove portion 74M crosses the base end position in the longitudinal direction of the belt-shaped plate portion 71X, and the groove portion 74M forms a triangular cross section and opens toward the hood portion 50F side. The distal end side of the strip-shaped plate portion 71X from the groove portion 74M forms the engaging arm 71, while the base end side of the strip-shaped plate portion 71X from the groove portion 74M forms the arm support portion 75. Further, the bottom of the groove portion 74M of the strip-shaped plate portion 71X The thin-walled portion of is the elastic hinge portion 74 . Other configurations are the same as those of the first embodiment.

In the female side pipe joint 10A of the present embodiment, the annular cover 40A having the structure described above can be easily manufactured by resin molding. Further, the engaging arm 71 can be engaged with the distal end of the hood portion 50F by elastically deforming the elastic hinge portion 74. When the engaging arm 71 is not engaged with the distal end of the hood portion 50F, the engaging arm 71 is closed. separates from the outer surface of the hood portion 50F and extends to the side of the female pipe joint 10A (more specifically, the annular cover 40A). That is, based on the posture of the engaging arm 71, it is possible to easily and clearly determine whether the male and female pipe joints 10, 50 are in the locked state.

[Third embodiment]
In the female pipe joint 10B of the present embodiment shown in FIGS. 14 and 15, the engaging arms 71 described in the first embodiment are arranged at two locations separated by 180 degrees on the annular cover 40B. Other structures are the same as those of the first embodiment.

[Fourth embodiment]
The annular cover 40C of the female pipe joint 10C of this embodiment shown in FIG. As with 71 , it is supported by an arm support portion 75 via an elastic hinge portion 74 . Other structures are the same as those of the first and second embodiments.

[Fifth embodiment]
This embodiment is shown in FIGS. 17-23, and is a third embodiment in that the female pipe fitting 10D does not have the annular cover 40 and a pair of engaging arms 71 are provided on the clip 30D. It is very different from the form. Only the differences from the third embodiment will be described below.

As shown in FIGS. 17 and 18, the large-diameter portion 14K of the female pipe joint 10D of this embodiment is a protruding projection that protrudes sideways from the opposite side portion of the weir portion 15S sandwiched between the clip accommodating grooves 15. As shown in FIGS. A section 17 is provided. The protruding protrusion 17 is arranged closer to the small diameter portion 14</b>L than the clip accommodating groove 15 . Further, as shown in FIG. 20, a triangular locking projection 23 protrudes from the distal end portion of the falling-off restricting claw 21 toward the large-diameter portion 14K. In addition, the facing surfaces of the locking projection 23 and the overhanging projection 17 are arranged substantially flush with a pair of inner side surfaces in the clip accommodating groove 15 .

As shown in FIGS. 19A and 19B, the clip 30D of this embodiment is provided with a pair of connecting arms 76 extending from the pair of protrusions 35 so as to approach each other. The pair of connecting arms 76 are curved in an arc shape and overlapped with the dam portion 15S from the outside (see FIG. 21). The clip 30D has a closed ring state (see FIG. 21) in which the pair of connecting arms 76 overlap in the circumferential direction of the male pipe joint 50, and an open ring state in which a gap is formed between the pair of connecting arms 76. state (see FIG. 22A).

As shown in FIGS. 19(A) and 19(B), the connecting arm 76 has a projecting piece 36 at its distal end, and a locking projection 37 is formed at the distal end of the projecting piece 36 . there is On one connecting arm 76 , the projecting piece 36 is arranged closer to the center of the male pipe joint 50 , and the locking projection 37 protrudes outward from the male pipe joint 50 . On the other hand, in the other connecting arm 76 , the protruding piece 36 is arranged closer to the outside of the male pipe joint 50 , and the locking projection 37 protrudes toward the center of the male pipe joint 50 . Then, when the clip 30D is in the ring-closed state, the pair of locking protrusions 37 are locked to each other (see FIG. 21).

As shown in FIG. 22B, when the clip 30D is opened, the weir portion 15S of the fitting tube portion 14 is exposed from between the pair of connecting arms 76. As shown in FIG. Here, the dam portion 15S is given a color different from that of the pair of connecting arms 76 (in FIG. 22B, the dam portion 15S is given a gray color to represent the difference in color. ). This makes it easier for the operator to recognize whether or not a gap is formed between the pair of connecting arms 76, that is, whether the clip 30D is in the ring-closed state or the ring-open state.

As shown in FIGS. 19(A) and 19(B), on the outer peripheral surface of the clip 30D, a pair of projecting portions 33 project laterally from the back side of the pair of connecting protrusions 32. A pair of arm support portions 75 is formed by bending a projecting piece projecting from the projecting portion 33 toward the male side pipe joint 50 side at right angles. A pair of engaging arms 71 described in the first embodiment extend from the tip end portions of the pair of arm support portions 75 toward the male side pipe joint 50 while being bent at right angles.

The description about the structure of the piping joint 100 of this embodiment is above. In the pipe joint 100 of the present embodiment, similarly to the first to fourth embodiments, the fitting cylinder portion 14 of the female pipe joint 10D reaches the normal fitting position of the fitting pipe portion 51Y of the male pipe joint 50. When fitted, as shown in FIG. 23, the connecting protrusion 32 of the clip 30D engages the outer peripheral groove 53M of the male pipe joint 50, and the male and female pipe joints 10, 50 are locked. Then, on condition that it is in the locked state, the pair of engaging arms 71 of the clip 30D engages the tip of the hood portion 50F of the male side pipe joint 50. As shown in FIG. Accordingly, it is possible to confirm whether or not the male and female pipe joints 10 and 50 are locked by confirming whether or not the engaging arm 71 is engaged with the tip portion of the hood portion 50F. Further, as in the first to fourth embodiments, the engaging arm 71 is engaged with the tip of the hood portion 50F while overlapping the outer surface of the male pipe joint 50. It becomes clear whether the male and female pipe joints 10 and 50 are locked or not, and it can be easily confirmed whether the male and female pipe joints 10 and 50 are locked.

In the pipe joint 100 of the present embodiment, when the clip 30D is opened to separate the male and female pipe joints 10 and 50, the clip 30D is dropped from the joint main body portion 11D by the drop-off restricting claws 21. can be prevented.

[Sixth embodiment]
This embodiment is shown in FIG. 24. A female pipe joint 10E of this embodiment differs from that of the third embodiment in the shape of a pair of protrusion receiving portions 41V of an annular cover 40V. It is the same as the embodiment. Specifically, as shown in FIG. 24(A), the projection receiving portion 41V has an L-shape, a guiding portion 41VA linearly extending from the distal end edge of the annular cover 40V to the base end side, and a guiding portion 41VA. and a housing portion 41VB extending from 41VA to one side in the circumferential direction of the annular cover 40V. Then, the annular cover 40V is slid to receive the pair of projections 35 of the clip 30D in the pair of guide portions 41VA of the pair of projection receiving portions 41V as shown in FIG. 24(B). By rotating the annular cover 40V, the pair of protrusions 35 can be accommodated in the pair of accommodating portions 41VB as shown in FIG. 24(C). As a result, the annular cover 40V is stably held at the normal slide position.

[Other embodiments]
(1) As shown in FIG. 25(A), a guide surface 72G may be provided on the outer side of the engaging projection 72 of the engaging arm 71 of the first to sixth embodiments. This facilitates the work of bringing the guide surface 72G into sliding contact with the outer edge of the tip of the hood portion 50F to engage the hook portion 73 with the tip portion of the hood portion 50F.

(2) Further, as shown in FIG. 25B, a guide surface 72J is provided inside the locking projection 72 of the engaging arm 71 of the first to sixth embodiments, so that the locking projection 72 is positioned on the hood. After getting over the tip surface of the portion 50F, it may easily enter the inside of the receptacle portion 50F.

(3) As shown in FIG. 26(A), a triangular locking projection 77 projecting outward from the tip of the engaging arm 71V is provided, and a flange 78 projecting outward from the tip of the receptacle 50F is provided. A configuration may be adopted in which the locking projection 77 is engaged by passing the distal end portion of the engaging arm 71V through the through hole 78A. In this case, a space for deforming the engaging arm 71V may be provided between the engaging arm 71V and the side surface of the receptacle 50F. Further, the flange 78 may not be provided, and the locking projection 77 may be protruded inward from the distal end portion of the engaging arm 71V and engaged with the distal end surface of the receptacle 50F.

(4) Further, as shown in FIG. 26(B), a through hole 73A is formed at the tip of the engaging arm 71W, and a projection 79 protruding from the outer surface of the hood portion 50F engages with the through hole 73A. may be

(5) Further, the target with which the engaging arm 71 engages is not limited to the hood portion 50F. As an example of this, for example, the cylindrical wall 56 of the hood portion 50F is not provided, and only the hose contact portion 55 is provided to protrude to the side of the drain hose 120, and the engagement arm 71 is engaged with the tip portion thereof. configuration, etc. can be considered.

(6) In the above embodiments, the first to sixth embodiments show examples in which one or two engaging arms 71 are provided, but the number of engaging arms 71 may be three or more. . Also, the engagement arm 71 of the fifth and sixth embodiments may be rotatably supported like the engagement arm 71 of the second and fourth embodiments.

(7) Instead of the clip 30 of the first to sixth embodiments, for example, a U-shaped or C-shaped clip that is fitted into the fitting cylinder portion 14 from the side and engages the outer peripheral groove 53M through the communication hole 16. A clip may be provided and the clip may be provided with a pivotal engagement arm.

(8) Also, the engaging arms may be provided on both the clip and the annular cover. Moreover, it is also possible to provide a configuration in which an engagement arm is provided in the joint main body of the female side piping joint and the engagement arm is not provided in the clip and the annular cover. Further, an engaging arm is provided on the male side pipe joint so that "on the condition that the fitting cylindrical portion is arranged at the normal fitting position, the female side pipe is attached to the female side pipe while overlapping the outer surface of the female side pipe joint." It is also conceivable to have a configuration of "engages the engaged portion of the joint".

(9) In the first to sixth embodiments, a portion of the clip 30 was visible through the protrusion receiving portion 41 of the annular cover 40 and the like at the normal sliding position of the annular cover 40, but it may be invisible. . In that case, the clip 30 may not be provided with the protrusion 35 and the annular cover 40 may not be provided with the protrusion receiving portion 41. Alternatively, as in the female side pipe joint 10F shown in FIG. The annular cover 40F may be provided with a cover wall 46 for covering the projection 35. As shown in FIG. Moreover, although the entire clip 30 is covered with the annular cover 40, the annular cover 40 may be made transparent so that it is possible to visually recognize whether or not the clip 30 is present inside.

(10) Although the joint main body 11 of the present embodiment has an L shape, it may have an I shape extending linearly.

10, 10A-10F Female side pipe joint 14 Fitting cylindrical portion 15 Clip accommodating groove 16 Communication hole 30, 30D Clip 35 Projection 40, 40A-40C, 40F, 40V Annular cover 41, 41V Projection receiving portion 50 Male side pipe joint 50F Hood portion 51Y Fitting pipe portion 53M Peripheral grooves 71, 70V, 71W Engagement arm 71X Strip plate portion 72 Locking projection 73 Hook portion 74 Elastic hinge portion 74M Groove portion 120 Drain hose

A first invention made to solve the above-mentioned problems is a female side pipe joint that is fixed to the end of a pipe and coupled to a male side pipe joint of a mating pipe, wherein the male side pipe joint is fitted. a fitting tubular portion fitted to the outside of the tubular portion; A communicating hole facing the outer peripheral groove of the pipe portion, a clip mounted on the outside of the fitting cylinder portion and engaged with the outer peripheral groove through the communicating hole, and the fitting cylinder portion are arranged at the normal fitting position. an engaging arm that engages with the engaged portion of the male side pipe joint in a state of overlapping with the outer surface of the male side pipe joint on the condition that the male side pipe joint is provided with an engaging arm.

In a second aspect of the invention , the clip is fitted to the outside of the fitting cylinder, is positioned when it slides toward the tip side of the fitting cylinder and reaches a regular slide position, and is fitted to the outside of the clip. and an annular cover for restricting the outward deformation of the clip, the engagement arm being provided on the annular cover and provided that the annular cover is positioned at the normal slide position. It is the female side pipe joint according to the first invention that engages with the engaging portion.

A third aspect of the invention is the female pipe joint according to the second aspect of the invention , wherein the annular cover has a visual confirmation hole that partially overlaps the clip when the annular cover is placed at the normal slide position.

A fourth invention is the female pipe joint according to the second invention or the third invention, wherein the clip is provided with a stopper for positioning the annular cover at the normal slide position.

A fifth invention is the female side pipe joint according to the first invention , wherein the engagement arm is provided on the clip.

According to a sixth aspect of the present invention , there is provided an elastic joint that rotatably supports the engaging arm and holds the engaging arm that is not engaged with the engaged portion in a posture away from the outer surface of the male pipe joint. A female side pipe joint according to any one of the first to fifth inventions, which includes a hinge portion.

A seventh aspect of the invention is provided with a strip-shaped plate portion extending laterally from the female pipe joint and a groove portion crossing a midway position in the longitudinal direction of the strip-shaped plate portion. The female side pipe joint according to the sixth aspect of the present invention , wherein an engaging arm is formed, and the thin portion of the band-shaped plate portion at the bottom of the groove portion forms the elastic hinge portion.

An eighth invention is a pipe comprising the female pipe joint according to any one of the first to seventh inventions , and the male pipe joint to which the female pipe joint is coupled. It is a joint.

In a ninth aspect of the invention , the male side pipe joint includes an insertion pipe portion that is inserted into the inside of the drain hose as the mating pipe, the outer side of which is covered with a heat insulating material, and an insertion pipe portion that is fitted to the outside of the drain hose. The pipe joint according to the eighth aspect of the present invention is provided with a hood portion, and the engaging arm is engaged at an arbitrary position on the entire periphery of the distal end portion of the hood portion.

A tenth invention is the pipe joint according to the ninth invention, wherein the engaging arm is provided with a hook portion that enters and engages with the tip portion of the receptacle.

An eleventh invention is the pipe joint according to any one of the eighth invention to the tenth invention, wherein the color of the engaging arm and the color of the outer surface of the male side pipe joint are different.

In a twelfth aspect of the invention , when the fitting tube portion of the female side pipe joint is fitted to the normal fitting position outside the fitting tube portion of the male side pipe joint, the communication hole of the fitting tube portion is formed as described above. An annular cover for a pipe joint in which a clip attached to the outer side of the fitting tubular portion and facing the outer peripheral groove of the fitting tubular portion engages the outer peripheral groove through the communicating hole, wherein the fitting tubular portion is fitted to the outside of the clip, is positioned when it slides toward the distal end side of the fitting cylinder and reaches a normal sliding position, and is formed to fit to the outside of the clip, and an engaging arm is integrally formed. provided that the fitting cylinder portion is arranged at the normal fitting position and the annular cover is arranged at the normal sliding position, the engagement arm is positioned on the outer surface of the male side pipe joint. It is an annular cover that engages with the engaged portion of the male pipe joint in an overlapping state.

According to the structures of the first and eighth inventions , when the tubular fitting portion of the female side pipe joint is fitted to the proper fitting position of the fitting pipe portion of the male side pipe joint, the fitting pipe portion is closed. The communication hole of the fitting cylinder part faces the outer peripheral groove, and the clip on the outside of the fitting cylinder part engages with the outer peripheral groove through the communication hole, so that the male and female pipe joints are locked to prevent them from coming off. Further, the female side pipe joint is provided with an engaging arm that engages with the engaged portion of the male side pipe joint on condition that the fitting cylindrical portion is arranged at the normal fitting position. Accordingly, it is possible to confirm whether or not the male and female pipe joints are locked by confirming whether or not the engaging arm is engaged with the engaged portion. In addition, since the engaging arm engages the engaged portion while overlapping the outer surface of the male pipe joint, whether or not the engaging arm engages with the engaged portion does not affect the engagement. Differences in whether or not the mating arm overlaps the outer surface of the male side piping joint, or differences in the amount of overlap between them, make it easier to check whether the male and female piping joints are locked or not. can.

In the configuration of the second aspect of the invention , the annular cover fitted to the tubular fitting portion of the female side pipe joint slides toward the distal end of the tubular fitting portion and is positioned when it reaches the regular slide position. Fitting on the outside of the clip reinforces the aforementioned locked state. Since the engaging arm engages the engaged portion on condition that the annular cover is arranged at the normal sliding position, it is confirmed whether or not the engaging arm is engaged with the engaged portion. Therefore, it is possible to easily confirm whether or not the locked state exists and confirm whether or not the locked state is strengthened at the same time.

The annular cover of the twelfth invention is attached to a female pipe joint that does not have an annular cover, or is replaced with an annular cover that does not have an engaging arm, and the annular cover of the twelfth invention is attached to the female pipe joint. When attached, the same effect as the configuration of the second invention can be obtained.

In the configuration of the third aspect of the invention , whether or not there is a clip inside the annular cover can be easily determined by whether or not a part of the clip is visually recognized inside the hole for visual confirmation of the annular cover or on the far side thereof. can be confirmed.

In the configuration of the fourth aspect of the invention , since the clip is provided with a stopper for positioning the annular cover at the normal sliding position, the annular cover is not positioned at the normal sliding position when the clip is disengaged from the fitting tube portion. , can be made aware of the detachment of the clip.

Note that the engagement arm may be provided on the clip ( a fifth aspect of the invention ). In that case, it may or may not have an annular cover. Further, the engagement arm may be provided at a portion of the female pipe joint other than the clip and the annular cover. Further, an engaging arm is provided on the male side pipe joint so that "on the condition that the fitting cylindrical portion is arranged at the normal fitting position, the female side pipe is attached to the female side pipe while overlapping the outer surface of the female side pipe joint." It is also conceivable to adopt a configuration of "engaging with the engaged portion of the joint".

In the configuration of the sixth aspect of the invention , when the engaging arm is not engaged with the engaged portion, it assumes a posture away from the outer surface of the male side pipe joint. Whether or not the joint is locked can be easily and clearly determined.

According to the configuration of the seventh aspect of the invention , it is possible to easily manufacture a female pipe joint provided with an engaging arm.

By using the pipe joint of the ninth aspect of the invention , it is possible to easily perform the work of confirming the connection of the pipe joint of the drain hose, which is often arranged in a dark place or a narrow place.

In the configuration of the tenth aspect of the invention , the hook portion of the engaging arm enters and engages the tip portion of the receptacle, thereby stabilizing the engaged state.

In the structure according to the eleventh aspect of the invention , since the color of the engaging arm differs from the color of the outer surface of the male side pipe joint, it becomes clear whether or not the engaging arm is engaged with the engaged portion.

Claims (12)

In a female pipe joint that is fixed to the end of a pipe and coupled to a male pipe joint of a mating pipe,
a fitting tube portion fitted to the outside of the fitting pipe portion of the male side pipe joint;
a communication hole formed in the fitting tube portion and facing an outer peripheral groove of the fitting tube portion when the fitting tube portion is fitted to a normal fitting position of the fitting tube portion;
a clip that is mounted on the outside of the fitting cylinder and engages with the outer peripheral groove through the communication hole;
On the condition that the fitting cylindrical portion is arranged at the normal fitting position, the engagement is engaged with the engaged portion of the male side piping joint in a state of being overlapped with the outer surface of the male side piping joint. an arm; and a female pipe fitting. Fitted on the outside of the fitting tube portion, slides toward the distal end of the fitting tube portion, is positioned when it reaches a normal slide position, fits on the outside of the clip, and is fitted on the outside of the clip. Equipped with an annular cover that regulates deformation to
2. The female side pipe joint according to claim 1, wherein said engaging arm is provided on said annular cover and engages said engaged portion on condition that said annular cover is arranged at said normal sliding position. . 3. The female side pipe joint according to claim 2, wherein said annular cover is provided with a visual confirmation hole which partially overlaps said clip when arranged at said normal sliding position. 4. The female side pipe joint according to claim 2, wherein said clip is provided with a stopper for positioning said annular cover at said normal slide position. 2. The female side pipe joint according to claim 1, wherein said engaging arm is provided on said clip. An elastic hinge portion that rotatably supports the engaging arm and holds the engaging arm that is not engaged with the engaged portion in a position away from the outer surface of the male pipe joint. A female pipe joint according to any one of claims 1 to 5. a strip-shaped plate portion extending laterally from the female pipe joint;
a groove portion that crosses the middle position in the longitudinal direction of the strip-shaped plate portion,
The front end side of the band-shaped plate portion from the groove portion forms the engaging arm,
7. The female side pipe joint according to claim 6, wherein the thin-walled portion of the strip-shaped plate portion at the bottom of the groove serves as the elastic hinge portion. A pipe joint comprising: the female pipe joint according to any one of claims 1 to 7; and the male pipe joint to which the female pipe joint is coupled. The male side pipe joint includes an insertion pipe portion inserted inside the drain hose as the mating pipe, the outside of which is covered with a heat insulating material, and a hood portion fitted to the outside of the drain hose. be
9. The pipe joint according to claim 8, wherein the engaging arm is engaged at any position around the tip of the receptacle. 10. The pipe joint according to claim 9, wherein the engaging arm is provided with a hook portion that enters and engages with the tip portion of the receptacle. 11. The pipe joint according to any one of claims 8 to 10, wherein the color of the engaging arm and the color of the outer surface of the male side pipe joint are different. When the fitting tube portion of the female side pipe joint is fitted to the proper fitting position outside the fitting tube portion of the male side pipe joint, the communicating hole of the fitting tube portion is aligned with the outer circumference of the fitting tube portion. An annular cover for a pipe joint in which a clip that faces the groove and is attached to the outside of the fitting cylinder engages the outer peripheral groove through the communication hole,
It is formed so as to be fitted to the outside of the fitting tube portion, slide toward the distal end side of the fitting tube portion, be positioned at a normal slide position, and be fitted to the outside of the clip. integrally provided with an engaging arm,
A state in which the engagement arm overlaps the outer surface of the male pipe joint on condition that the fitting cylinder portion is arranged at the normal fitting position and the annular cover is arranged at the normal sliding position. and an annular cover that engages with the engaged portion of the male pipe joint.

Images