JP7227706B2 - pipe joint - Google Patents

Description

The present invention relates to a pipe joint with a cleaning port.

2. Description of the Related Art A pipe joint with a cleaning port provided with an opening called a cleaning port is installed in a part of a pipeline in order to check the state of contamination inside the pipeline due to drainage and to clean the inside of the pipeline. The cleaning port protrudes radially outward from the body outer surface of the joint body. The protruding cleaning port not only becomes an obstacle during transportation and cleaning, but can also be a factor in the deterioration of drainage performance. In order to solve these problems, a pipe joint has been developed in which the radial projection of the cleaning port is suppressed (see Patent Document 1, for example). In the pipe joint disclosed in Patent Document 1, when the cover is pushed into the cleaning port and rotated, the engaging protrusion provided on the cover moves along the engaging groove (introduction groove) of the cleaning port. A system (a so-called bayonet system) is adopted in which the movement of the lid body is regulated by moving the lid body by pressing and abutting the end of the engagement groove.

By the way, since the inside of the contaminated pipeline is cleaned by flowing high-pressure cleaning water, it is necessary to maintain the water tightness of the cleaning port so that the cleaning water does not leak from the cleaning port during cleaning. be. For example, in Patent Document 2, a non-linear bent portion is formed in the gap between the cleaning port and the lid, and after the wash water is slowed down by this bent portion, the wash water is stopped by a packing. Techniques for preventing outflow to the outside and improving water stoppage have been disclosed.

JP 2015-200405 A JP 2017-115386 A

A conventional bayonet-type lid has a perfect circular shape in a plan view from the insertion direction of the lid. Therefore, it is difficult to distinguish a change in the tightening state of the lid between before and after the lid is attached, and it may be difficult to judge from the appearance whether the lid is properly tightened.

In order to maintain and ensure water stoppage, it is necessary that the cover is completely tightened, but at the work site, without noticing that the cover is not tightened properly, washing water is allowed to flow, causing water leakage. Situations can arise that can Therefore, there is a demand for a pipe joint that allows the current tightening state to be reliably grasped. Further, as such a pipe joint, there is a demand for a simple structure that does not include a bent portion or the like, which complicates the working process and the mold.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a pipe joint which has a simple structure and which enables confirmation of the water stopping state at the cleaning port.

In order to solve the above problems, the present invention employs the following means.

(1) A pipe joint according to an aspect of the present invention includes a tubular joint body having a cleaning port, a cover body attached to the cleaning port while being rotated, and an annular cover attached to the cleaning port. and a packing, wherein when the lid is attached to the cleaning opening, the flange of the lid has a non-perfect circular shape in a plan view from the central axis direction of the cleaning opening, and the At least a portion of the outermost circumference of the flange overlaps the outermost circumference of the cleaning opening.

(2) In the pipe joint described in (1) above, in the plan view, the outer periphery of the flange portion is composed of two arcs and two parallel sides connecting the ends of the arcs. may

(3) In the pipe joint described in either (1) or (2) above, the side wall of the lid has a wavy shape along the circumferential direction so as to be connected to the curved outer surface of the joint body. It is preferable that the relatively thick portion has an engagement portion with the cleaning opening.

(4) In the pipe joint according to any one of (1) to (3) above, the joint main body side of the outer surface of the lid has a first tapered portion whose diameter decreases as it approaches the joint main body. and the joint body side of the inner surface of the cleaning port has a second tapered portion that decreases in diameter as it approaches the joint body, and the first tapered portion and the second tapered portion contact each other. It is preferable that the taper angles of both are adjusted so that they are in contact with each other.

(5) In the pipe joint according to any one of (1) to (4) above, a concave portion is formed in a portion of the outer surface of the lid body to which the packing is attached, and the packing and the It is preferable to further include a backup ring that closes the gap with the inner wall of the recess.

(6) In the pipe joint according to any one of (1) to (5) above, the packing has a crushing margin that protrudes toward the joint main body when the cover is attached to the cleaning port. is preferred.

(7) In the pipe joint according to any one of (1) to (6) above, it is preferable that the inner wall of the recess is rounded.

In the pipe joint of the present invention, it is possible to judge the tightening state of the lid body from the appearance.

It is a perspective view which shows the component structure of the pipe joint which concerns on 1st embodiment of this invention. (a), (b) is a side view of the cover which comprises the pipe joint of FIG. FIG. 2 is a cross-sectional view parallel to the main pipeline of the pipe joint of FIG. 1; FIG. 4 is a perspective view showing a state in which the cleaning port is not completely closed in the pipe joint according to the first embodiment of the present invention; (a) and (b) are a perspective view and a cross-sectional view showing a state in which the cleaning port is completely closed in the pipe joint according to the first embodiment of the present invention. 8A and 8B are partial cross-sectional views showing a state in which the cleaning port is not closed and a state in which the cleaning port is closed, respectively, in the pipe joint according to the second embodiment of the present invention; FIG. FIG. 11 is a perspective view showing a component configuration of a pipe joint according to a modified example of the third embodiment of the present invention; 8(a) and 8(b) are side views of a lid constituting the pipe joint of FIG. 7. FIG. FIG. 10 is a perspective view showing a state in which the cleaning port is not completely closed in the pipe joint according to the third embodiment of the present invention; (a) and (b) are a perspective view and a cross-sectional view showing a state in which the cleaning port is completely closed in the pipe joint according to the third embodiment of the present invention. 8A and 8B are partial cross-sectional views showing a state in which the cleaning port is not closed and a state in which the cleaning port is closed, respectively, in the pipe joint according to the third embodiment of the present invention; FIG. Fig. 10 is a partial cross-sectional view of a pipe joint according to a third embodiment of the present invention; (a) A partial cross-sectional view of a pipe joint according to a fifth embodiment of the present invention. (b) It is a perspective view of packing which comprises the pipe joint of (a). FIG. 11 is a partial cross-sectional view of a pipe joint according to a sixth embodiment of the present invention;

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, pipe joints according to embodiments to which the present invention is applied will be described in detail with reference to the drawings. In addition, in the drawings used in the following explanation, in order to make the features easier to understand, the characteristic portions may be enlarged for convenience, and the dimensional ratios of each component may not necessarily be the same as the actual ones. do not have. Also, the materials, dimensions, and the like exemplified in the following description are examples, and the present invention is not limited to them, and can be implemented with appropriate modifications within the scope of the invention.

<First Embodiment>
FIG. 1 is a perspective view showing the component configuration of a pipe joint 100 according to the first embodiment of the invention. The pipe joint 100 includes a tubular joint main body 101 having a cleaning opening 101A, a lid body 102 attached to the cleaning opening 101A while being rotated, and an annular packing (sealing member) 103 attached to the cleaning opening. , is equipped with

The joint main body 101 is mainly composed of a main pipe member 101B extending in a predetermined direction and a cleaning port portion 101A provided on the side wall thereof. The main pipe member 101B and the cleaning opening portion 101A are integrated. Both ends of the main pipe member 101B serve as connection portions for pipes (not shown) constituting a drain pipe. In this embodiment, the main pipe member 101B is linear, but the shape of the main pipe member 101B is not particularly limited, and may be curved or bent.

The cleaning port 101A protrudes outside the main pipe member 101B, and its side wall is formed to extend in a direction substantially perpendicular to the direction of the central axis 101C of the main pipe member. A pipe line 101D inside the cleaning port portion 101A communicates with a main pipe line 101E inside the main pipe member 101B.

An engaging portion 105 that engages the lid 102 is formed on the inner side surface 101a of the cleaning port portion 101A on the far side (closer to the outside) from the main pipe member 101B. The engaging portion 105 means an engaging groove (hereinafter referred to as an engaging groove 105) that guides an engaging protrusion of the lid body 102, which will be described later, to a predetermined engaging position along the circumferential direction of the cleaning opening portion 101A. are doing.

FIG. 2(a) is a side view of lid 102 seen from a direction parallel to central axis 101C of the main pipe member when lid 102 is attached to cleaning port 101A. FIG. 2(b) is a side view of lid 102 seen from a direction perpendicular to central axis 101C of main pipe member 101B when lid 102 is attached to cleaning port 101A. Both figures show the state in which the packing 103 is attached.

The packing 103 is attached by fitting it into a recess provided along the circumferential direction on the outer surface 102a of the lid. At least a part of the packing after being attached protrudes out of the recess. This embodiment exemplifies the case where only one packing 103 is provided, but the number of packings 103 is not limited, and two or more packings 103 may be provided.

The lid body 102 includes an insertion cylinder portion 102A inserted inside the cleaning opening portion 101A, an engaging portion 106 fixed to the cleaning opening portion 101A, and a flange portion 104 for checking the tightening condition of the cleaning opening portion 101A. and they are integrated.

The insertion tube portion 102A has a cylindrical shape and an outer diameter slightly smaller than the inner diameter of the cleaning port pipe 101D, and is structured to be insertable into the cleaning port portion 101A. The distal end side (main tube member 101B side) of the insertion tube portion 102A has a similarly curved shape so as to be connected to the curved outer surface of the main tube member 101B without gaps. That is, the side wall (and the tip thereof) of the lid 102 has a shape that continuously undulates along the circumferential direction when viewed from a direction perpendicular to the insertion direction of the lid 102. Thick wall portions (wave crest portions) 102B whose thickness is relatively increased and thin wall portions (wave trough portions) 102C whose thickness is relatively decreased are arranged alternately.

The engaging portion 106 is provided on the outer side surface of the insertion cylinder portion 102A, and is guided along the engaging groove 105 of the cleaning opening portion 101A and engaged with a predetermined engaging portion when the cleaning opening portion 101A is mounted. means an engaging projection (hereinafter referred to as an engaging projection 106).

A mounting method of the cover 102 to the cleaning port 101A is not particularly limited, and examples thereof include a bayonet method and a turn-up method.

In the bayonet method, the cover 102 is pushed into the cleaning opening 101A and rotated, so that the engaging projection 106 provided on the cover 102 is moved along the engaging groove 105 provided on the cleaning opening 101A to the terminal end. It is a method to move until it hits and engage there. When this method is used, the movement is divided into two stages, when the lid body 102 is pushed in and when it is rotated. Therefore, the engagement groove 105 in this case needs to be composed of a portion extending in the length direction (pushing direction) of the engagement projection 106 and a portion extending in the circumferential direction (rotation direction).

FIG. 3 is a cross-sectional view parallel to the main pipeline 101E of the pipe joint 100 of this embodiment. The turn-up method is a method in which the engagement protrusion 106 is moved along the engagement groove 105A until it abuts the terminal end by rotating while being pushed, and is engaged there. When using this method, the engaging groove 105A must be configured to extend in a direction that is inclined with respect to the length direction of the engaging projection 106. As shown in FIG.

In the turn-up method, the engagement groove 105A is inclined toward the near side (flange portion 104 side) in the insertion direction I of the cover 102 with respect to the radial direction D of the cleaning port portion 101A. Therefore, when the lid 102 is rotated in the direction of removing it from the cleaning opening 101A (for example, counterclockwise in FIG. 4), the lid 102 follows the engagement projection 106 moving along the engagement groove 105A. Move forward. At this time, by setting the insertion opening of the engagement groove 105A closer to the front side, the lid body 102 can be easily removed.

Further, by setting the center of gravity of the lid 102 to the front side of the opening end of the cleaning port 101A, when the engaging projection 106 reaches the insertion end of the engaging groove 105A, the lid 102 is , comes off from the cleaning opening 101A by its own weight.

By using the turn-up method, at least when removing the lid 102, it becomes easy to check whether or not the lid 102 has been removed. In addition, even when the lid 102 is attached, this turn-up method ensures that the lid 102 will come off simply by inserting it into the opening end of the cleaning port 101A. construction can be realized.

FIG. 4 is a perspective view showing a state in which the cover 102 is not completely attached to the cleaning port 101A in the pipe joint 100, and the cleaning port 101A is not completely closed. 5(a) and 5(b) are a perspective view and a cross-sectional view showing a state in which the cover 102 is completely attached to the pipe joint 100 and the cleaning port 101A is completely closed.

When the lid 102 is attached to the cleaning opening 101A (attachment process and attachment completion), the flange portion 104 is non-uniform in plan view from the direction of the central axis 101F of the cleaning opening (insertion direction of the lid 102). It has a perfect circular shape. This non-perfect circular shape means a shape with lower rotational symmetry than a perfect circle with respect to the central axis 101F, and includes, for example, an elliptical shape and a rectangular shape. In addition, when the rectangular flange portion 104 is rotated, there is a problem in that the corner portions are likely to collide with a member such as a pipe connection portion projecting in the radial direction. Therefore, for example, by rounding a pair of two opposite sides of a rectangle (upper and lower portions in FIG. 5), a flange without corners can be obtained. It can rotate smoothly.

In the present embodiment, in the plan view, the flange portion 104 extends in the left-right direction and has symmetrically rounded arcs in the vertical direction. In this case, the outer periphery (outermost periphery 104a) of the flange portion 104 is composed of two arcs (curved portions) formed vertically and parallel to each other connecting the ends thereof, as shown in FIGS. and two sides (straight line portions).

Furthermore, the outermost circumference 104a of the flange portion 104 in plan view has a shape at least partially overlapping the outermost circumference 101b of the cleaning opening portion 101A. However, the outermost peripheries 104a and 101b actually overlap each other only when the attachment of the cover 102 to the cleaning opening 101A is completed (FIG. 5), and when the attachment is not completed or incomplete. Both engaging portions 105 and 106 are configured so as not to overlap (FIG. 4). Therefore, it is possible to determine the fastening state of the lid body 102 simply by visually confirming whether or not a predetermined portion of the outermost periphery 104a of the flange portion 104 overlaps with the outermost periphery 101b of the cleaning opening portion 101A. .

For example, if the accuracy of rotational symmetry is increased by 90 degrees, 60 degrees, and 45 degrees, as in the conventional art, the number of engagement protrusions on the lid body 102 is increased, and the grooves of the cleaning opening 101A are increased. This increases the number, which complicates the structures of the lid 102 and the cleaning opening 101A.

Further, for example, the engaging portions 105 and 106 are provided at four locations, two of which are engaged with the groove A and the projection A, and the remaining two locations are configured so that the groove B and the projection B are engaged. may have been. In this case, if the groove A and the protrusion B or the groove B and the protrusion A are mistakenly engaged, the cover 102 cannot even be inserted into the cleaning opening 101A, and the cover 102 is temporarily removed and inserted. It will take time to redo.

In this embodiment, the engaging portions 105 and 106 are provided only at two locations facing each other across the central axis 102D of the lid 102, and the accuracy of the rotational symmetry is every 180 degrees. , the structure is simpler than that of the conventional cover and cleaning port. Furthermore, the engaging portions 105 and 106 provided at two locations have substantially the same shape, respectively, and have rotational symmetry with respect to the central axis 102D. Therefore, for example, even if the cover 102 is upside down (vertical direction) at the start of attachment (insertion) to the cleaning opening 101A, it can be properly tightened in the same manner as when it is not upside down. can.

Since the cleaning opening 101A has a shape protruding from the main pipe member 101B, a worker working around the joint body 101 may come into contact with or collide with the protruding cleaning opening 101A, which reduces work efficiency and safety. There is a risk of loss. In addition, if there is this cleaning opening 101A, it is necessary to secure an installation space for that amount, which limits the layout of the periphery. From these points of view, the cleaning opening 101A is required to be as short as possible.

However, since the engagement groove 105 is provided on the inner side surface 101a of the cleaning opening portion 101A, it is necessary to secure an area for that. Therefore, it is difficult to shorten the cleaning opening portion 101A with the conventional configuration in which the engaging grooves 105 are evenly provided in the circumferential direction of the cleaning opening portion 101A.

In view of these circumstances, as shown in FIG. 1, the engagement portion (engagement groove 105) with the outer surface 102a of the lid is relatively thick among the side walls constituting the cleaning opening portion 101A. Preferably, it is formed only on the wall portion 101G and not formed on the thin wall portion 101H. Since the thick wall portion 102G has a larger side area, it is easier to secure the space for the engaging groove 105. Even if it is not possible to secure the space and the cleaning port portion 101A needs to be extended, the thin wall portion can be used. This is because less extension is required compared to the case of providing in the portion 101H. With such a configuration, the substantial projecting length of the cleaning port portion 101A, that is, the distance W between the outer surface of the main pipe member 101B and the outer surface of the flange portion 104 in the cross-sectional view of FIG. (b) reference) can be reduced.

The pipe joint 100 according to the present embodiment has a simple structure that does not include a bent portion or the like, and when the lid 102 is attached to the cleaning opening 101A, that is, the lid 102 is tightened against the cleaning opening 101A. is properly performed, at least a portion of the outermost periphery 104a of the flange portion 104 overlaps with the outermost periphery of the cleaning port portion 101A. Therefore, in the pipe fitting 100 according to the present embodiment, if the outermost peripheries overlap at a predetermined portion, the tightening is complete (closed state), and if they do not overlap, the tightening is incomplete (open state). can be determined. That is, it is possible to judge the tightening state of the lid body 102 from the appearance, and thus it is possible to easily confirm the water stopping state. For example, if it is determined that the tightening is not properly performed, it will be prompted to tighten again, at least it is possible to prevent water leakage due to incomplete tightening. It is possible to maintain a water-tight state.

<Second embodiment>
FIG. 6A is a partial cross-sectional view showing a state in which the cleaning port 101A is not closed (a state in which the lid 102 is not completely attached) in the pipe joint according to the second embodiment of the present invention. This figure corresponds to the region _R1 of the pipe joint 100 shown in FIG. 5(b). FIG. 6(b) is a partial cross-sectional view showing a state in which the cleaning port 101A is closed (a state in which the cover 102 is completely attached) in the pipe joint.

In the pipe joint of this embodiment, the joint main body 101 side of the outer surface 102 a of the lid has a first tapered portion 107 whose diameter decreases as it approaches the joint main body 101 . The inner side surface 101a of the cleaning port 101A on the side of the main pipe member 101B has a second tapered portion 108 whose diameter decreases as it approaches the main pipe member 101B. The taper angles of the first tapered portion 107 and the second tapered portion 108 are adjusted to substantially match so that the first tapered portion 107 and the second tapered portion 108 are in contact with each other when mounted.

Other configurations are the same as those of the first embodiment, and portions corresponding to those of the first embodiment are denoted by the same reference numerals regardless of the difference in shape. In this embodiment, at least the same effects as in the first embodiment can be obtained.

The pipe joint of the present embodiment has a function of guiding and fixing the insertion tube portion 102A so that the central axis 102D of the lid body coincides with the central axis 101F of the cleaning opening portion 101A when the lid body 102 is attached ( centering function). Therefore, since the lid 102 can evenly press and crush the packing 103 in the circumferential direction, the lid 102 can be accurately attached to the cleaning opening portion 101A. As a result, it is possible to improve the waterproof performance between the lid 102 and the cleaning opening portion 101A. In addition, the centering effect allows even an untrained person to tighten the lid body 102 with high accuracy.

<Third Embodiment>
FIG. 7 is a perspective view showing the component configuration of a pipe joint 120 according to the third embodiment. FIGS. 8(a) and 8(b) are side views of the lid body 102' constituting the pipe joint 120 of FIG. 7, similarly to FIGS. 2(a) and 2(b). The side wall of the insertion tube portion 102A of the lid 102' has a tapered shape that inclines inward toward the tip in the insertion direction.

FIG. 9 is a perspective view showing a pipe joint 120 in which the cover 102' is not completely attached to the cleaning port 101A' and the cleaning port 101A' is not completely closed, as in FIG. It is a diagram. In FIGS. 10(a) and 10(b), similarly to FIGS. 5(a) and 5(b), in the pipe joint 120, the attachment of the cover 102' is completed and the cleaning port 101A' is completely closed. It is the perspective view which shows a state, and sectional drawing.

FIG. 11(a) shows a pipe joint 120 according to the third embodiment of the present invention in which the cleaning port 101A' is not closed (attachment of the lid 102' is completed), as in FIG. 6(a). is a partial cross-sectional view showing a state in which it is not installed). This figure corresponds to the region _R1 of the pipe joint 120 shown in FIG. 10(b). FIG. 11(b) is a partial cross-sectional view showing a state in which the cleaning port 101A' is closed (a state in which the cover 102' is completely attached) in the pipe joint.

The pipe joint 120 has two packings 103 . The configuration other than the number of packings 103, the lid body 102', and the mounting locations of the packings 103 in the cleaning port 101A' is the same as the configuration of the first embodiment. The same reference numerals are used regardless of the difference in shape. In this embodiment, at least the same effects as in the first embodiment can be obtained.

Furthermore, since the pipe joint 120 of the present embodiment includes the two packings 103 on the lid 102', it is possible to doubly prevent water leakage and improve the water stopping effect. Note that the number of packings 103 is not limited, and may be three or more.

<Fourth embodiment>
FIG. 12 is a partial cross-sectional view of a pipe joint according to a fourth embodiment of the invention. This figure corresponds to the region _R2 of the pipe joint 100 shown in FIG. 5(b). The pipe joint of this embodiment has a backup ring 109 that is fitted together with a packing 103 into a packing mounting recess (groove) 102E provided on the outer side surface 102a of the lid and presses the packing 103. As shown in FIG. Other configurations are the same as those of the first embodiment, and portions corresponding to those of the first embodiment are denoted by the same reference numerals regardless of the difference in shape. In this embodiment, at least the same effects as in the first embodiment can be obtained.

The volume of the backup ring 109 preferably fills the gap that occurs when the packing 103 is fitted into the recess 102E. Considering the amount of deformation of the packing 103, the volume of the backup ring 109 is such that the concave portion 102E is too narrow, making it difficult to fit the packing 103 there. The recess 102E is adjusted so as to prevent the packing 103 from protruding between the cleaning port 101A and the lid 102 due to too narrow recess 102E.

The backup ring 109 may be fitted at any position within the recess 102E, and as shown in FIG. side) or the inner wall on the main pipe member 101B side (left side in FIG. 12). Also, the number of backup rings 109 may be increased or decreased as necessary, taking into consideration the state of pressure on the packing 103 .

The pipe joint of the present embodiment has a backup ring 109 to appropriately control the crushing of the packing 103 so as to close the gap between the inner surface 101a of the cleaning opening 101A and the outer surface 102a of the lid. It is possible to improve the water stoppage. In addition, by having the backup ring 109, it is possible to suppress excessive deformation of the packing 103 due to water pressure during washing, and furthermore, it is possible to suppress excessive deformation of the packing 103 when the lid body 102 is tightened. .

<Fifth Embodiment>
FIG. 13(a) is a partial cross-sectional view of a pipe joint according to a fifth embodiment of the present invention. FIG. 13(b) is a perspective view of the packing 103 that constitutes the pipe joint of FIG. 13(a). In the pipe joint of this embodiment, the packing 103 is composed of a ring-shaped portion 103A similar to that of the above embodiment and a projecting portion 103B functioning as a crushing margin. The protruding portion 103B protrudes continuously or intermittently from the ring-shaped portion 103A toward the joint main body 101 along the circumferential direction. FIG. 13(b) illustrates a case in which the projections are continuous.

Other configurations are the same as those of the second embodiment, and portions corresponding to those of the second embodiment are denoted by the same reference numerals regardless of the difference in shape. In this embodiment, at least the same effects as those of the second embodiment can be obtained.

In the pipe joint of this embodiment, the protruding portion 103B of the packing functions as a crushing allowance between the inner surface 101a of the cleaning opening portion 101A and the outer surface 102a of the lid. Therefore, the cleaning opening portion 101A and the lid body 102 are less likely to be displaced from each other after attachment, and the sealing performance for the gap between the two can be enhanced, thereby improving the water stoppage.

<Sixth Embodiment>
FIG. 14 is a partial cross-sectional view of a pipe joint according to a sixth embodiment of the invention. In the pipe joint of this embodiment, the inner wall of the recess 102E into which the packing 103 is fitted is rounded so as to follow the general shape of the packing 103 in a cross-sectional view including the central axis of the lid. Other configurations are the same as those of the second embodiment, and portions corresponding to those of the second embodiment are denoted by the same reference numerals regardless of the difference in shape. In this embodiment, at least the same effects as those of the second embodiment can be obtained.

In the pipe joint of this embodiment, since the inner wall of the recess 102E is rounded, when the packing 103 is attached to the lid or removed from the lid, the packing 103 does not move against the inner wall of the recess 102E. It becomes difficult to slide. Therefore, it is possible to prevent the packing 103 from being rolled up, prevent the packing 103 from coming off the lid body 102, and thereby maintain the waterproof property.

100, 120... Pipe joint 101... Joint bodies 101A, 101A'... Cleaning port 101B... Main pipe member 101C... Central axis 101D of main pipe member 101B... Pipe line 101E... Main pipe line 101F Central axis 101G of cleaning port 101A High wall portion 101H Low wall portion 101a Inner surface 101b of cleaning port 101A Outermost circumference 102 of cleaning port 101A , 102′ lid body 102A insertion tube portion 102B high wall portion 102C low wall portion 102D central axis 102E of lid body 102 recessed portion 102a lid body Outer surface 103 of 102 Packing 103A Ring-shaped portion 103B Protruding portion 104 Flange portion 104a Outermost circumference of flange portion 104 105 Engagement groove 106 Engagement Coupling projection 107 First taper portion 108 Second taper portion 109 Backup ring

Claims (3)

a cylindrical joint body having a cleaning opening;
a cover that is attached to the cleaning opening by rotating it,
An engaging portion for engaging the cover is formed along the circumferential direction of the cleaning opening on the inner surface of the cleaning opening,
In a plan view from the central axis direction of the cleaning port, the flange portion of the lid has a non-perfect circular shape,
In the planar view,
In an incomplete mounting state in which the lid body is fitted to the engaging portion, the outer edge portion of the outermost periphery of the cleaning opening portion can be visually recognized.
In the attached state in which the cover is attached to the cleaning opening by rotating the cover from the incomplete attachment state, the flange portion of the cover overlaps the outermost periphery of the cleaning opening. As a result, the outer edge of the outermost periphery of the cleaning port becomes invisible. In the plan view, the outer periphery of the flange portion is a rectangle, one set of two sides forming the rectangle has a rounded shape, and another set of two sides has a non-rounded shape. The pipe joint according to claim 1. A first water stop portion and a second water stop portion are provided in order toward the tip in the inserting direction of the cover body on the joint main body side of the outer surface of the cover body, and the second water stop portion Between the water portion and the tip, a first tapered portion that inclines as it approaches the joint body,
The joint main body side of the inner surface of the cleaning port has a second tapered portion that inclines as it approaches the joint main body,
3. The pipe joint according to claim 1, wherein said first tapered portion and said second tapered portion are in contact with each other.

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