JP2022066005A - Drain joint - Google Patents

Abstract

To provide a drain joint for allowing a flexible pipe to be directly mounted thereto.SOLUTION: A drain joint 1 includes a joint body 3 through which drain water drained from connected equipment passes and out of which backflow water tending to flow in a direction opposite to that of the drain water flows to the outside. At a downstream end based on the flow of the drain water, a screw part 42 is provided to which a cap nut of the flexible pipe is connected.SELECTED DRAWING: Figure 3

Description

The present invention relates to a drainage joint that allows drainage discharged from connected equipment to pass through.

For example, there is a drainage joint described in Patent Document 1 (“connecting device” in the document). This drainage joint includes a joint body configured as an indirect drainage joint, a cover body attached to the joint body to regulate foreign matter from entering the inside of the joint body, and equipment attached to the joint body and to be connected. It is provided with a connector member connected to the joint body and a tubular member that is adhered to the joint body and indirectly connected to the device via the joint.

A drainage pipe is connected to the drainage portion of the joint body, which is the end opposite to the device. Although not clear from the description in Patent Document 1, the drainage pipe is connected to the drainage portion by adhesion.

Here, a flexible pipe (commonly known as "flexible pipe" or "flexible pipe") is used as a part of the drainage pipe in order to increase the degree of freedom of connection in response to the expansion and contraction of the pipe. A cap nut is provided at the end used for connection in the flexible pipe, and the cap nut is screwed into the thread of the object to be connected to make the connection. However, in the drainage joint of Patent Document 1, the flexible pipe cannot be directly attached to the drainage portion.

Japanese Unexamined Patent Publication No. 2019-90437

Therefore, it is an object of the present invention to provide a drainage joint to which a flexible pipe can be directly attached.

The present invention includes a joint body that allows drainage discharged from a connected device to pass through and discharges backflow water that tends to flow in the direction opposite to the drainage to the outside, and is based on the flow of the drainage. A drainage joint having a threaded portion to which a cap nut of a flexible pipe is connected at the downstream end.

According to this configuration, since the threaded portion is provided at the downstream end of the joint body, the cap nut of the flexible pipe can be connected to this threaded portion.

Further, the joint body has a pipe connection portion to which a pipe can be connected by internal fitting at the downstream end portion, and a detachable adapter portion is attached to the pipe connection portion, and the screw portion has a screw portion. , It may be provided at the downstream end portion of the adapter portion.

According to this configuration, the cap nut of the flexible pipe can be connected to the adapter portion attached to the pipe connection portion. It is also possible to connect a pipe to the pipe connection portion from which the adapter portion has been removed.

Further, the adapter portion may be attached to the pipe connection portion by external fitting, and may have a tool engaging portion on the outer periphery for engaging a tool used for connecting the cap nut.

According to this configuration, since the adapter portion has the tool engaging portion, it is easy to connect the cap nut to the adapter portion.

Further, the joint body is arranged so that the flow path formed inside faces in the vertical direction, and the inner bottom surface of the adapter portion becomes lower from the outer diameter position to the inner diameter position in the arrangement. It can also have an inclined surface.

According to this configuration, since the inner bottom surface of the adapter portion has an inclined surface, drainage can be smoothly performed in the adapter portion.

INDUSTRIAL APPLICABILITY According to the present invention, a cap nut of a flexible pipe can be connected to a threaded portion having a downstream end portion of a joint body. Therefore, the flexible tube can be directly attached.

It is a perspective view of the drainage joint which concerns on one Embodiment of this invention. It is a figure which shows the use state of the drainage joint. It is an exploded perspective view of the drainage joint. It is a vertical sectional view passing through the radial center of the drainage joint. It is the bottom view of the joint body in the drainage joint. (A) is a front view showing the adapter part of the drainage joint. (B) is a sectional view taken along line VI-VI shown in (a).

The drainage joint 1 according to the embodiment of the present invention will be described. The vertical expression in the following corresponds to the vertical direction in the usage state of the drainage joint 1 (see FIG. 2). In the drainage joint 1, drainage flows from above to below. That is, the upstream side based on the drainage flow is the upper side of the drainage joint 1, and the downstream side based on the drainage flow is the lower side of the drainage joint 1.

The drainage joint 1 according to the present embodiment is a type of joint called an “indirect drainage joint”. As shown in FIG. 1, the drainage joint 1 includes a device-side connection portion 2, a joint main body 3, and an adapter portion (drainage-side connection portion) 4. As shown in FIG. 2, for example, the drainage joint 1 is attached to a drainage portion H1 having a drainage portion H on the upper side or a pipe connected to the drainage portion H1 (hereinafter, these are collectively referred to as “equipment or the like”). It is connected, and the lower side is connected to the drainage pipe P, which is a pipe that communicates with the drainage facility. Of the drainage joints 1, at least the joint body 3 is arranged so that the flow paths formed inside (the flow paths corresponding to the drainage areas S1 and the water leakage areas S2 shown in FIGS. 4 and 5) face in the vertical direction. .. The direction of the joint body 3 is basically the vertical direction, but in some cases, the joint body 3 may be tilted. The device H corresponds to various devices that generate drainage. For example, a device or facility that requires hygienic consideration and is not preferable to be directly connected to a drainage facility, such as a latent heat recovery type water heater.

The device side connection portion 2 is configured such that the upper side is connected to the device or the like and the lower side is connected to the joint body 3 so that drainage can pass through the inside. The device-side connection portion 2 includes a cylindrical device-side water passage section 21 and a device-side mounting section 22 that can be engaged with the joint body 3. The device-side water passage portion 21 of the present embodiment includes a plurality of ribs 211 protruding outward in diameter from the outer peripheral surface.

The device-side water passage portion 21 is provided on the upper side and is provided on the device-side engaging portion 212 that engages with the device or the like, and the lower end portion is provided on the lower side and is inside the device side in which the lower end portion is inserted into the inside of the joint body 3. The insertion portion 213 is provided. The device-side engaging portion 212 is a cylindrical portion in which a threaded portion 212a having a thread of a female screw is formed on the inner peripheral surface, and can be screwed into a male screw provided in a device or the like.

The device-side mounting portion 22 includes a substantially cylindrical mounting base portion 221 and a device-side engaging claw 222 projecting inward from the inner peripheral surface of the lower end portion of the mounting base portion 221. A plurality of device-side engaging claws 222 are provided, and in the present embodiment, a pair is provided at a distance of approximately 180 degrees in the circumferential direction of the mounting base portion 221. Further, a plurality of plane surfaces are formed on the outer peripheral surface of the mounting base portion 221. The outer peripheral surface of the mounting base portion 221 of the present embodiment is formed in a polygonal shape in a cross section. A tool such as a spanner can be engaged with the outer peripheral surface of the mounting base 221.

The joint body 3 has a cylindrical appearance, and is a portion where an opening 332a is formed in a part of an outer wall that partitions the inside and outside of the joint body 3. Further, the joint body 3 is configured such that drainage flows in from the upper end portion and drainage flows out from the lower end portion. As shown in FIG. 3, the joint body 3 has a device-side fitting portion 31 formed at the upper end portion and can be fitted with the device-side connection portion 2, and a drainage side formed at the lower end portion and capable of fitting with the adapter portion 4. A fitting portion 32 and an indirect drainage portion 33 connecting the device-side fitting portion 31 and the drainage-side fitting portion 32 are provided. With this configuration, the joint body 3 passes through the drainage discharged from the connected equipment or the like (drainage flowing downward in the paths R1 and R2 shown in FIG. 4), and tries to flow in the direction opposite to the drainage. The backflow water (backflow water that tends to flow upward in the path R3 shown in FIG. 4) is discharged to the outside through the opening 332a.

The device-side fitting portion 31 is a portion to which the device-side connection portion 2 can be engaged. Further, the device-side fitting portion 31 is a tubular portion whose outer diameter is smaller than the inner diameter of the mounting base portion 221 in the device-side connection portion 2 and larger than the inner diameter of the device-side engaging claw 222. That is, the device-side fitting portion 31 is a portion where the mounting base portion 221 can be externally fitted, and the device-side engaging claw 222 in the device-side connecting portion 2 is locked when the mounting base portion 221 is externally fitted. Specifically, the device-side fitting portion 31 is a device that is a groove for guiding the device-side engaging claw 222 from the upper end portion to the device-side groove portion 311 and the device-side groove portion 311 to which the device-side engaging claw 222 can be engaged. A side guide portion 312 is provided. The device-side groove portion 311 of the present embodiment is provided over one circumference in the circumferential direction of the device-side fitting portion 31. Further, the device-side guide portion 312 is a recess formed in the device-side connection portion 2 into which the device-side engaging claw 222 can be fitted.

The drainage side fitting portion 32 is a portion to which the adapter portion 4 can be engaged. Further, the drainage side fitting portion 32 is a tubular portion whose outer diameter is smaller than the inner diameter of the fitting cylinder portion 411 in the adapter portion 4. That is, the drainage side fitting portion 32 is a portion where the fitting cylinder portion 411 can be externally fitted, and the drainage side engaging claw 412 in the adapter portion 4 is locked when the fitting cylinder portion 411 is externally fitted. Specifically, the drainage side fitting portion 32 is a drainage side groove portion 321 to which the drainage side engagement claw 412 can engage, and a drainage groove that guides the drainage side engagement claw 412 from the lower end portion to the drainage side groove portion 321. A side guide portion 322 is provided. The length of the drainage gutter portion 321 of the present embodiment in the circumferential direction is substantially equal to the length in the circumferential direction of the drainage side engaging claw 412. Further, a plurality of drainage side groove portions 321 of the present embodiment are provided, and in the present embodiment, they are provided at two locations separated by approximately 180 degrees in the circumferential direction of the drainage side fitting portion 32. Further, the drainage side guide portion 322 is a recess into which the drainage side engaging claw 412 formed in the adapter portion 4 can be fitted.

The indirect drainage portion 33 is a tubular portion that connects the equipment-side fitting portion 31 and the drainage-side fitting portion 32. Specifically, the indirect drainage portion 33 includes a drainage wall portion 331 that is an outer wall that partitions the inside and outside of the joint body 3, and a leak wall portion 332 that is an outer wall of the joint body 3 and has an opening 332a that communicates inside and outside. , Equipped with.

The drainage wall portion 331 is a wall body that partitions the inside and outside of the joint body 3 so that water cannot pass through. That is, the drainage wall portion 331 is a wall body in which an opening is not formed. The water leakage wall portion 332 is a wall body of the joint body 3, and is formed with an opening 332a through which water can pass through the inside and outside of the joint body 3. The opening 332a of the present embodiment is formed by gathering a plurality of slits extending in the circumferential direction (lateral direction). The shape of each opening 332a is not limited to the shape of the present embodiment, and various shapes that do not hinder the discharge of backflow water can be adopted.

A partition wall 34 is provided inside the joint body 3. In the present embodiment, the joint body 3 is integrally formed with an outer peripheral portion (a portion appearing in the appearance of FIG. 3) (see FIG. 5). However, the partition wall 34 is formed separately from the outer peripheral portion, and can be integrated by fitting or the like. The partition wall 34 is a wall body in which one end and the other end in the radial direction are connected to the drainage wall portion 331 and partition the drainage wall portion 331 and the leak wall portion 332. Further, the region defined by the drainage wall portion 331 and the partition wall 34 is the drainage region S1 in which the drainage moves from the upper side to the lower side, and the region defined by the leaky wall portion 332 and the partition wall 34 is the lower portion. It is a water leakage region S2 in which the backflow water flowing back from the side to the upper side leaks from the opening 332a to the outside of the joint body 3. Further, the partition wall 34 partitions between the drainage wall portion 331 and the leaky wall portion 332 so that the drainage does not pass from the drainage region S1 to the leaky region S2.

As shown in FIG. 5, the partition wall 34 includes a flat wall portion 341 which is a flat wall body extending along the radial direction of the joint body 3, and a curved wall portion 342 curved so as to extend along the circumferential direction. To prepare for. The curved wall portion 342 is formed with a communication port 343 that communicates the drainage region S1 and the leak region S2 so as to extend in the vertical direction.

The adapter portion 4 is configured such that the upper end side is connected to the joint body 3 and the lower end side is connected to the drain pipe P so that drainage can pass through the inside. Specifically, as shown in FIGS. 6A and 6B, the adapter portion 4 is provided at the upper end portion, and is provided at the drainage side mounting portion 41 that engages with the other end side of the joint body 3 and the lower end portion. It is provided with a pipe engaging portion 42 that engages with the flexible pipe F connected to the drainage pipe P, and a connecting portion 43 that connects the drainage side mounting portion 41 and the pipe engaging portion 42.

As shown in FIG. 6B, the drainage side mounting portion 41 is a cylindrical portion that engages with the lower end portion of the joint body 3. Specifically, the drainage side mounting portion 41 includes a tubular fitting cylinder portion 411 and a drainage side engaging claw 412 protruding inward from the inner peripheral surface of the upper end portion of the fitting cylinder portion 411. The drainage side mounting portion 41 of the present embodiment is externally fitted to the lower end portion of the joint main body 3 and engages with the joint main body 3. That is, the fitting cylinder portion 411 of the present embodiment can be externally fitted to the drain side fitting portion 32 of the joint body 3. Further, a plurality of drainage side engaging claws 412 are provided, and in the present embodiment, a pair is provided at a distance of approximately 180 degrees in the circumferential direction of the fitting cylinder portion 411. Further, a plurality of flat surfaces are formed on the outer peripheral surface of the fitting cylinder portion 411. The outer peripheral surface of the fitting cylinder portion 411 of the present embodiment is formed in a polygonal shape (more specifically, a hexagonal shape similar to a nut) in cross section, and this outer peripheral surface connects the cap nut F1. It is a tool engaging part for engaging a tool such as a spanner used when doing so.

The pipe engaging portion 42 engages with the pipe or the like to connect the adapter portion 4 and the pipe or the like. Specifically, the pipe engaging portion 42 is tubular and has a portion on the outer peripheral surface capable of engaging with a pipe or the like, and the inside of the pipe engaging portion 42 is configured to allow water to pass through. The pipe engaging portion 42 of the present embodiment includes a threaded portion 42a having a male thread on the outer peripheral surface. That is, the pipe engaging portion 42 of the present embodiment is configured so that the outer peripheral surface is screwed with the pipe or the like and water can pass through the inside. The cap nut F1 of the flexible pipe F is connected to the threaded portion 42a by being screwed.

The inner bottom surface 431 of the connecting portion 43 is an inclined surface that becomes lower from the outer diameter position to the inner diameter position in the state of using the drainage joint 1. Since the inner bottom surface 431 of the adapter portion 4 has an inclined surface in this way, drainage flows along the inclined surface, and drainage can be smoothly performed in the adapter portion 4. In the present embodiment, the entire inner bottom surface 431 is an inclined surface, but the present invention is not limited to this, and for example, only the area of the inner bottom surface 431 where the drainage hits can be an inclined surface.

Next, the movement of water inside the drainage joint 1 will be described with reference to FIG. The drainage discharged from the device or the like moves (falls) due to gravity and moves to the joint body 3 through the device-side connection portion 2. The drainage that has moved to the joint body 3 moves (falls) to the adapter portion 4 through the drainage region S1. Specifically, of the drainage that has moved to the joint body 3, the drainage at the position near the drainage wall portion 331 moves according to gravity as it is (path R1), and the drainage at the position near the leaky wall portion 332 is inclined at the partition wall 34. It is guided to a position closer to the drainage wall portion 331 by the upper end portion formed in the above direction, and moves in the drainage region S1 according to gravity (path R2). The drainage that has moved from the drainage region S1 to the adapter section 4 moves inside the adapter section 4 and is discharged toward the drainage pipe P.

The backflow water that is going to flow back from the drainage pipe P toward the device side moves to the joint body 3 through the adapter portion 4. The backflow water that has flowed back to the water leakage wall portion 332 leaks from the opening 332a to the outside of the joint body 3 (path R3). Therefore, it is possible to prevent the backflow water from reaching the device or the like. Specifically, since the water leakage region S2 has an opening 332a as compared with the drainage region S1, the water flow resistance is smaller. Therefore, the backflow water flows to S2 instead of S1 and leaks from the opening 332a to the outside of the joint body 3. Since the backflow water leaks to the outside of the joint body 3, it is possible to prevent the device H from stopping or failing due to the backflow of drainage.

Next, a method of constructing a drainage structure using the drainage joint 1 of the present embodiment will be described. This method is a method in which the drainage joint 1 is connected to the drainage portion H1 of the device H in which drainage is generated, and then the cap nut F1 of the flexible pipe F is connected to the downstream end portion of the drainage joint 1. The process will be described below in order.

As shown in FIG. 4, the drainage joint 1 is assembled by fitting the device-side connection portion 2 to the upper end portion of the joint body 3 and fitting the adapter portion 4 to the lower end portion. Specifically, the device-side connection portion 2 is fitted to the device-side fitting portion 31, and the adapter portion 4 is fitted to the drain-side fitting portion 32. Incidentally, since the drain pipe P (resin pipe or the like) may be directly attached to the joint main body 3, the adapter portion 4 can be attached to the joint main body 3 at the installation site of equipment or the like. When the drain pipe P is directly attached to the joint body 3, the adapter portion 4 cannot be attached to the joint body 3.

When fitting the device-side connection portion 2 into the joint body 3, the device-side insertion section 213 is inserted inside the device-side fitting section 31, and the mounting base portion 221 is externally fitted into the device-side fitting section 31. That is, the outer wall of the device-side fitting portion 31 is inserted into the space defined by the mounting base portion 221 and the device-side insertion portion 213. Specifically, until the device-side engaging claw 222 fits into the device-side groove portion 311, the device-side engaging claw 222 is guided by the device-side guide portion 312, and the device-side connecting portion 2 is moved from the upper side to the lower side of the joint body 3. Move to the side. When the device-side engaging claw 222 fits into the device-side groove portion 311, the device-side engaging claw 222 and the device-side groove portion 311 engage with each other, and the movement of the device-side connecting portion 2 to the upper side is restricted. Further, since the device-side groove portion 311 is provided over one circumference in the circumferential direction of the joint body 3, the device-side engaging claw 222 can move in the circumferential direction along the device-side groove portion 311. The side connection portion 2 is rotatable relative to the joint body 3 about the axial direction of the joint body 3.

When fitting the adapter portion 4 to the joint body 3, the drain side mounting portion 41 is externally fitted to the drain side fitting portion 32. That is, the drainage side fitting portion 32 is inserted inside the fitting cylinder portion 411. Specifically, the adapter portion 4 is moved from the lower side to the upper side of the joint body 3 while the drain side engaging claw 412 is guided by the drain side guide portion 322 until the drain side engaging claw 412 fits into the drain side groove portion 321. Move it. When one drainage side engaging claw 412 fits into one drainage side groove portion 321 and the other drainage side engaging claw 412 fits into the other drainage side groove portion 321, the drainage side engaging claw 412 and the drainage side groove portion 321 respectively. Engage with each other to regulate the downward movement of the adapter portion 4 and the rotation with respect to the joint body 3.

As shown in FIG. 2, the drainage joint 1 is attached between the equipment or the like and the drainage facility. The drainage joint 1 of the present embodiment is directly attached to the device H. Further, the drainage joint 1 is attached to the device H (for example, a latent heat recovery type water heater) so that one end side in the axial direction is on the upper side and the other end side is on the lower side.

The drainage joint 1 is attached to the device or the like by engaging the device-side engaging portion 212 with the device or the like. Specifically, by screwing a male screw (not shown) provided in the drainage portion H1 of the device or the like and a screw portion 212a which is a female screw formed in the device side engaging portion 212, the device side engaging portion 212 And the equipment or the like engage with each other, and the drainage joint 1 is connected to the equipment or the like. Since the device-side connection portion 2 of the present embodiment can rotate relative to the joint body 3 with the axial direction of the joint body 3 as the central axis, only the device-side connection portion 2 is screwed to the device or the like. Since it can be rotated, it is easy to screw it into the device and the like, and it is easy to connect to the device and the like. Further, by rotating the joint body 3 relative to the device-side connection portion 2, the direction of the opening 332a can be set to an arbitrary direction. Further, since the rib 211 is provided on the outer peripheral surface of the device-side engaging portion 212, for example, a finger can be put on the rib 211, so that the operation of rotating the device-side connecting portion 2 is easy.

Further, a pipe or the like communicating with the drainage facility is attached to the lower end portion of the drainage joint 1. The drainage joint 1 of the present embodiment is attached to the drainage pipe P communicating with the drainage facility via the flexible pipe F. Specifically, by screwing the cap nut F1 of the flexible pipe F into the pipe engaging portion 42, the flexible pipe F whose other end is connected to the drain pipe P is engaged with the pipe engaging portion 42 to drain the water. The joint 1 is connected to the flexible pipe F. When the cap nut F1 is screwed into the pipe engaging portion 42, a tool such as a spanner is applied to the flat surface formed on the outer peripheral surface of the fitting cylinder portion 411 so that the joint body 3 and the adapter portion 4 do not rotate. By pressing it, the cap nut F1 can be easily rotated. In the drainage joint 1 of the present embodiment, since the adapter portion 4 is connected to the joint body 3 (specifically, it is connected so as not to rotate), only the cap nut F1 can be rotated and is flexible. It is easy to connect to the pipe F.

According to the above method, in order to connect the cap nut F1 of the flexible pipe F to the downstream end portion of the drainage joint 1, for example, the center position H1C of the drainage portion H1 and the center position PC of the drainage pipe P possessed by the device H. The misalignment can be absorbed by the bending of the flexible tube F. Therefore, the drainage pipe P is not overloaded. Therefore, it is possible to construct a drainage structure corresponding to the misalignment of the drainage pipe P with the center position PC.

Although the embodiments of the present invention have been described above with reference to an example, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the gist of the present invention.

For example, although the external shape of the joint body 3 has been described as being cylindrical, it can be a cylinder having various shapes such as a square cylinder.

Further, the number of the drainage wall portion 331 and the leak wall portion 332 is not limited to one, and a plurality of drainage wall portions 331 may be provided. In this case, a plurality of partition walls 34 are also provided inside the joint body 3, and partition between the plurality of drainage wall portions 331 and the plurality of leak wall portions 332. For example, the partition wall 34 can be cross-shaped in cross section.

Further, although the drainage joint 1 of the embodiment includes the adapter portion 4, the drainage joint 1 may be configured not to include the adapter portion 4. In the case of this configuration, a pipe such as a resin pipe (for example, a vinyl chloride pipe) communicating with the drainage facility is inserted into, for example, the inside of the drainage side fitting portion 32 of the joint body 3, and the outer peripheral surface of the pipe or the like and the drainage side fitting portion are inserted. By adhering the inner peripheral surface of 32 with the intervention of an adhesive, the drainage joint 1 and the pipe or the like can be connected by internal fitting. In this case, the drainage side fitting portion 32 functions as a pipe connection portion for the pipe.

Regarding this, in the above-described embodiment, the pipe engaging portion 42, which is a threaded portion, is formed at the downstream end portion of the adapter portion 4, so that the threaded portion is indirectly formed according to the joint body 3 reference. It can be said that. However, in the configuration without the adapter portion 4, a threaded portion may be formed at the downstream end portion of the joint body 3. In this case, it can be said that the threaded portion is directly formed according to the joint body 3 standard.

Further, although the three parts of the device side connection part 2, the joint body 3 and the adapter part 4 have been described as being separate bodies, the device side connection part 2 and the joint body 3 are integrally configured (in other words, the joint body). The device-side connection portion 2 may be formed as an integral inseparable part of 3), or the joint body 3 and the adapter portion 4 may be integrally configured (in other words, the adapter as an integral inseparable part of the joint main body 3). (Part 4 is formed), or the device side connection part 2, the joint body 3, and the adapter part 4 are all integrated (in other words, the device side connection part as an integral inseparable part of the joint body 3). 2 and the adapter portion 4 are formed).

1 Drainage joint 2 Equipment side connection part 212a Threaded part of equipment side connection part 3 Joint body 32 Piping connection part, drainage side fitting part 4 Adapter part, drainage side connection part 411 Fitting cylinder part (tool engaging part)
42 Threaded part, piping engaging part 42a Threaded part of piping engaging part 431 Inner bottom surface F Flexible pipe F1 Cap nut H Equipment H1 Drainage part of equipment

Claims (4)

It is equipped with a joint body that allows the drainage discharged from the connected equipment to pass through and allows the backflow water that is about to flow in the direction opposite to the drainage to flow out to the outside. A drainage fitting with a threaded portion to which the cap nut of the flexible pipe is connected. The joint body has a pipe connection portion at the downstream end portion to which a pipe can be connected by internal fitting.
A detachable adapter portion is attached to the pipe connection portion.
The drainage joint according to claim 1, wherein the threaded portion is provided at the downstream end portion of the adapter portion. The drainage joint according to claim 2, wherein the adapter portion is attached to the pipe connection portion by external fitting, and has a tool engaging portion for engaging a tool used for connecting the cap nut on the outer periphery thereof. .. The joint body is arranged so that the flow path formed inside faces in the vertical direction.
The drainage joint according to claim 2 or 3, wherein the inner bottom surface of the adapter portion has an inclined surface that becomes lower from the outer diameter position to the inner diameter position in the above arrangement.

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