JP2019078096A - Joint for indirect drainage - Google Patents

Abstract

To provide a joint for indirect drainage which prevents discharge water circulating inside from being scattered to outside.SOLUTION: A joint for indirect drainage 1 comprises an inner side joint part 30 and an outer side joint part 10. An opening 41 is formed as an inside water passage portion on a lower end of the inner side joint part 30. A support part 45 is provided on an inner peripheral surface of a body part 35 of the inner side joint part 30, which extends toward the center axis of the inner side joint part 30. A shaft-shaped transmission part 47 is provided on the support part 45, which extends toward downstream side relative to the opening 41.SELECTED DRAWING: Figure 3

Description

  The present invention relates to an indirect drainage joint that enables indirect drainage on a drainage path portion.

  Conventionally, for example, it is adopted as a drainage path which drains drainage drainage of equipment such as a water heater, and prevents the drainage from flowing backward from the drainage pipe on the downstream side to adversely affect the equipment such as failure. The indirect drainage structure is already well known (see, for example, Patent Document 1).

JP, 2016-211166, A

  However, in the joint for indirect drainage disclosed in Patent Document 1, when the drainage that has flowed into the inflow portion flows out from the outlet corresponding to the lower end of the water flow cylinder portion, it is scattered to the outside through the opening. There was a problem that

  Then, an object of this invention is to provide the joint for indirect drainage which can suppress that the waste_water | drain which distribute | circulates an inside disperses outside.

  The present invention is formed at the downstream end of the upstream drainage pipe disposed upstream, and is disposed downstream of the upstream drainage pipe end from which the drainage flowing from the upstream flows and the upstream drainage pipe And a downstream drain end formed at the upstream end of the downstream drain and into which the drained water flowing from the upstream flows in, wherein the upstream drain end and the downstream drain end are in the vertical direction. A joint for indirect drainage that connects the upstream drainage pipe end and the downstream drainage pipe end on the drainage path facing each other, and an outer joint part having an internal space, and the outer joint part And an inner joint portion having at least a main body portion through which drainage flows while being slidable in the vertical direction with respect to the inner joint portion, the downstream end portion of the outer joint portion being provided with An outlet side connection portion to which the downstream side drain pipe end portion is connected is formed And an outer water flow portion communicating the internal space of the outer joint portion with the outside of the outer joint portion is provided on the outer peripheral wall portion of the outer joint portion, and the upstream side of the inner joint portion The end on the side is formed with an inflow side connecting part to which the upstream side drain pipe end is connected, and an opening is provided in the lower end of the main body of the inner joint part, An inner water passage communicating the inside of the main body with the outside is formed by the opening, and the inner peripheral surface of the main body of the inner joint portion projects toward the central axis of the inner joint portion. And the transmission portion comprising a shaft-like body drawn out to the downstream side of the inner water flow portion is provided on the support portion. It is a drainage joint.

  In this configuration, the drained water flowing into the inside of the main body portion of the inner joint portion travels from the inner water flow portion to the transmission portion and drops from the lower end of the transmission portion to the internal space of the outer joint portion. leak. As described above, according to the present invention, the drained water flowing out from the inner joint portion gathers down as far as possible from the outer water flowing portion and flows down, so the waste water is scattered from the outer water flowing portion to the outside. Can be effectively suppressed.

  The drainage includes drain drainage discharged from equipment arranged on the upstream side, rainwater discharged from rain gutters arranged on the upstream side, and the like.

  Moreover, the structure by which the lower end of the said transmission part is located more downstream than the lower end of the said outer side water flow part is proposed.

  With this configuration, the position at which the drainage drips from the transmission portion is on the downstream side of the lower end of the outer water flow portion, so it is more effective that the drainage is scattered from the outer water flow portion to the outside Can be suppressed.

  Furthermore, a configuration is proposed in which the lower end portion of the transmission portion has a tip shape protruding toward the downstream side.

  With this configuration, the drainage flowing down along the transmission section flows down from the tip-shaped portion so as to drip down well, so the scattering range when flowing out from the inner joint portion is reduced. There is an advantage to

  The transmission portion has a tapered shape in which the outer diameter is reduced toward the downstream side, and a configuration is proposed in which the separation distance from the inner circumferential surface of the outer joint portion increases toward the downstream side. Be done.

  With this configuration, the drainage discharged from the inner joint portion is less likely to reach the outer water flow portion of the outer joint portion, so that the drainage is scattered to the outside through the outer water flow portion. Can be suppressed. Further, even if the inner joint portion is inclined to the outer joint portion at the time of assembly, the transmission portion can be prevented from contacting the inner peripheral surface of the outer joint portion.

  Furthermore, a configuration is proposed in which the transmission portion is provided with a vane portion protruding in the radial direction with respect to the axis of the transmission portion.

  With such a configuration, the surface area of the transmission portion as a whole is expanded, so that the waste water flowing out from the inside of the main body portion of the inner joint portion can be effectively collected. In addition, even if the outer diameter of a droplet becomes large as it goes to the lower end of a transmission part by setting it as the dimensional shape that the amount of protrusion becomes small as it goes to the lower end which is a tip of the transmission part. An effect is obtained that the drainage is unlikely to scatter outside.

  The joint for indirect drainage of the present invention has an excellent effect that the drainage flowing inside is less likely to scatter to the outside.

It is explanatory drawing which shows the use condition of the joint for indirect drainage which concerns on an Example. It is an appearance perspective view of a joint for indirect drainage concerning an example. The joint for indirect drainage which concerns on an Example is shown, (a) is a front view, (b) is a longitudinal cross-sectional view. The joint for indirect drainage which concerns on an Example is shown, (a) is a side view, (b) is a longitudinal cross-sectional view. It is explanatory drawing which shows the operation | movement outline | summary of a valve body, (a) shows a fluid backflow prevention state, (b) shows a passing state. The joint for indirect drainage in the state which the internal-diameter reduced diameter part and the protrusion part engaged is shown, (a) is a side view, (b) is a longitudinal cross-sectional view. It is explanatory drawing which shows the process of connecting the joint for indirect drainage. It is explanatory drawing which shows the process of connecting the joint for indirect drainage. It is a longitudinal cross-sectional view which shows the state which separated the water flow member and the connection member. The inner joint part which concerns on an Example is shown, (a) is a longitudinal cross-sectional view, (b) is a top view, (c) is a DD sectional view of (b), (d) is It is an AA line sectional view of (a), (e) is an BB line sectional view of (a), (f) is an CC line sectional view of (a). The inner joint part concerning a modification is shown, (a) is a partial longitudinal cross-sectional view, (b) is the EE sectional view taken on the line of (a).

  An embodiment in which the joint for indirect drainage according to the present invention is used on a drainage path portion for draining water drainage of a water heater will be described in detail. In addition, this invention is not limited to the Example shown below, A design change is possible suitably.

  As shown in FIG. 1, the indirect drainage joint 1 is used by being disposed between a water heater 70 disposed on the upstream side and a drainage main pipe 75 disposed on the downstream side. Specifically, the indirect drainage joint 1 is connected to a drain pipe portion 71 which is an upstream side drainage pipe for draining the drain drainage of the water heater 70 and is connected to the waste water main pipe 75 while being connected A drain pipe portion 73 which is a downstream side drain pipe is connected. The joint 1 for indirect drainage has a function of indirectly draining the drain drainage flowing from the upstream toward the drainage main pipe 75.

Hereinafter, the configuration of the indirect drainage joint 1 will be described.
As shown in FIGS. 2 to 4 and the like, the indirect drainage joint 1 is inserted into the cylindrical outer joint portion 10 and the outer joint portion 10 with the axial direction as the vertical direction, and is assembled in a nested manner And a cylindrical inner joint portion 30.

First, the outer joint portion 10 will be described.
As shown in FIGS. 2 to 4, a downstream side drain pipe end portion 73 a formed at the upstream end of the drain pipe portion 73 is connected to the downstream end (lower end portion) of the outer joint portion 10. A tubular outlet side connection 11 is formed.

  Further, the outer joint portion 10 includes a cylindrical water passage member 15 disposed on the upper side, and a cylindrical connection member 16 disposed on the lower side and including the outflow side connection portion 11. Here, the water flow member 15 and the connection member 16 are separate members, and are connected by a known bayonet mechanism 17 so as to be removable in the axial direction (vertical direction).

  Further, in the side peripheral wall portion having the side peripheral surface in the outer peripheral wall portion of the water passing member 15, a plurality of internal spaces (outside internal space) 12 of the outer joint portion 10 and the outside of the outer joint portion 10 are communicated. The outer water flow part 13 which consists of a through-hole of this is provided. The plurality of through holes are arranged in line in the vertical and horizontal directions, and the lower end of the outer water passage 13 corresponds to the position of the through hole at the lowermost position.

  Further, as shown in FIGS. 3 b and 4 b, an inner diameter reduced diameter portion 18 whose inner diameter is reduced is formed at the upper end opening portion of the water passing member 15. The stopper function of the inner diameter reduced diameter portion 18 will be described later.

  On the other hand, as shown in FIG. 3 b and FIG. 4 b, a check valve 20 as trap means is detachably attached to the lower end of the water passage member 15. The check valve 20 has a function of allowing drain drainage to flow downstream in the indirect drainage joint 1 and preventing drainage backflow in the upstream direction.

  More specifically, the check valve 20 has an elastically deformable valve structure which allows drain drainage to flow therethrough and is reduced in diameter toward the lower side. And the discharge port 22 (refer FIG. 5) formed in the lower end part has become the state closed by the pair of flat plate-like edge parts 23 and 23 which mutually oppose in close_contact | adherence mutually.

Next, the inner joint portion 30 will be described.
As shown in FIGS. 2, 3 a and 4 a, the inner joint portion 30 has a cylindrical main body portion 35 inserted into the inside diameter reduced diameter portion 18 of the outer joint portion 10. Then, at the upstream end portion (upper end portion), a female screw-shaped inflow side connection portion 31 to which the upstream drainage pipe end portion 71a formed at the downstream end of the drain pipe portion 71 is connected is formed. . As shown in FIG. 7a, the upstream drainage pipe end 71a of the drain pipe portion 71 has an external thread shape that can be screwed to the inflow side connecting portion 31 of the inner joint portion 30, and the upstream drainage The pipe end portion 71a and the inflow side connection portion 31 are screwed to each other to be fixed to each other.

  Further, as shown in FIG. 2 and the like, on the outer peripheral surface of the inflow side connection portion 31 of the inner joint portion 30, an engaged portion 32 having an outer shape in the form of a hexagonal column is formed. As a result, an operation of screwing the inflow side connecting portion 31 to the upstream side drain pipe end portion 71a can be easily and quickly performed by engaging a general tool such as a hexagonal wrench with the engaged portion 32. Further, the engaged portion 32 is easy to be touched by the finger of the operator even when the screwing operation is performed manually, and the workability is good. The engaged portion 32 may have a configuration in which a rib stands.

  Further, at the lower end of the main body portion 35, a large diameter portion 36 having an outer diameter which can not pass through the inside diameter reduced diameter portion 18 of the outer joint portion 10 is formed.

  In addition, on the outer peripheral surface of the upper end portion of the main body portion 35, a protruding portion 37 is formed in a circumferential shape. Specifically, the protruding portion 37 has an outer diameter slightly larger than the inner diameter of the inner diameter reduced diameter portion 18 so as to be engageable with the inner diameter reduced diameter portion 18 of the outer joint portion 10.

Next, an operation aspect of the outer joint portion 10 with respect to the inner joint portion 30 will be described.
Since the outer joint portion 10 and the inner joint portion 30 are assembled in a nested manner as described above, the outer joint portion 10 and the inner joint portion 30 can slide in the vertical direction. Here, the sliding range of the outer joint portion 10 when using the inner joint portion 30 as a reference is as follows.

  That is, as shown in FIGS. 6a and 6b, when the outer joint portion 10 is positioned at the upper limit, the inner diameter reduced diameter portion 18 of the outer joint portion 10 and the projection 37 of the inner joint portion 30 are engaged. It becomes impossible to move each other. Thus, when the inner diameter reduced diameter portion 18 functions as a stopper, the separation distance between the outflow side connection portion 11 and the inflow side connection portion 31 in the indirect drainage joint 1 is minimized. An engagement means is constituted by the inner diameter reduced diameter portion 18 of the outer joint portion 10 and the projecting portion 37 of the inner joint portion 30.

  On the other hand, as shown in FIG. 3, when the outer joint portion 10 is positioned at the lower limit, the inner diameter reduced diameter portion 18 of the outer joint portion 10 and the large diameter portion 36 of the inner joint portion 30 are engaged. . At this time, in the joint for indirect drainage 1, the separation distance between the outflow side connection portion 11 and the inflow side connection portion 31 is maximized.

  Next, an example of a method of connecting the indirect drainage joint 1 on the drainage path portion X will be described according to FIGS. 7 and 8.

  As shown in FIG. 7A, on the drainage path portion X between the drain pipe portion 71 and the drainage pipe portion 73 facing each other in the vertical direction, first, the core of the drainage pipe portion 73 is shifted to A space sufficient to allow the indirect drainage joint 1 to intervene below the pipe portion 71 is secured. In this case, the drain pipe portion 71 may be bent to secure a space sufficient to connect the indirect drainage joint 1.

  Next, as shown in FIG. 7B, the inflow side connection portion 31 of the indirect drainage joint 1 is screwed to the upstream drainage pipe end portion 71a of the drain pipe portion 71. At this time, since the engaged portion 32 is formed in the inner joint portion 30 of the indirect drainage joint 1, the operation can be easily and quickly performed using a general tool such as a hexagonal wrench or by hand tightening. be able to. At this time, the joint 1 for indirect drainage is in a state in which the inner diameter reduced diameter portion 18 of the outer joint portion 10 and the protruding portion 37 of the inner joint portion 30 are engaged. That is, the separation distance between the outflow side connection portion 11 and the inflow side connection portion 31 is minimized.

  Then, as shown to Fig.8 (a), the core of the drain pipe part 73 is returned to an original position. In this state, the downstream drainage pipe end 73 a of the drainage pipe portion 73 is located directly below the outflow side connection portion 11 of the indirect drainage joint 1.

  Then, as shown in FIG. 8 (b), the outer joint portion 10 is pulled downward so as to release the engagement between the inner diameter reduced diameter portion 18 of the outer joint portion 10 and the projection 37 of the inner joint portion 30. Then, the outflow side connection portion 11 and the downstream side drain pipe end portion 73a of the drain pipe portion 73 are connected, and the work of connecting the pipes is completed. Thus, a pipe connection structure in which the indirect drainage joint 1 is connected on the drainage path portion X is constructed.

  As described above, the joint for indirect drainage 1 does not force fit between the drain pipe portion 71 and the drainage pipe portion 73, but drains by sliding the outer joint portion 10 and the inner joint portion 30 up and down. The pipe 71 and the drainage pipe 73 can be connected in order.

  In the normal state where the drain drainage does not flow in a state where the construction as shown in FIG. 1 is completed, as shown in FIG. 5 (a), the edge portions 23 and 23 of the check valve 20 are in close contact with each other The fluid outlet 22 is in the closed fluid backflow prevention state α. In such a state, the fluid (drainage or gas) in the drainage main pipe 75 is prevented from flowing upstream relative to the check valve 20. Therefore, the fluid does not leak into the water heater 70 to damage the device.

  On the other hand, when the drain drainage flows out from the water heater 70 and a predetermined amount of drain drainage is accumulated in the check valve 20, the check valve 20 is elastically deformed by the weight of the drain drainage and it is shown in FIG. As shown, the rims 23, 23 are separated from each other, and the outlet 22 is in a passing state β where the opening 22 is opened. In such a state, drain drainage in the check valve 20 is appropriately drained to the downstream side. Further, the joint 1 for indirect drainage has a configuration in which the inner joint portion 30 is disposed on the upper side and the outer joint portion 10 is disposed on the lower side, and drain drainage is from the inner joint portion 30 having a small inner diameter to the inner diameter. Since the fluid flows toward the large outer joint portion 10, drain drainage can be smoothly drained without staying in the indirect drainage joint 1. When drain drainage accumulated in the check valve 20 is properly discharged, the check valve 20 returns to its original shape and is again in the fluid backflow prevention state α.

  In addition, even if the drainage flows back from the drainage pipe portion 73 to the indirect drainage joint 1, such a backflow water can flow out from the outer internal space 12 through the outer water flow portion 13, so the indirect drainage structure is It is built properly.

  In the above-described pipe connection step, an adhesive or the like may be applied in advance to the upstream drainage end portion 71a and the downstream drainage end portion 73a. In particular, since the upstream side drain pipe end 71a and the inflow side connection portion 31 are connected by screwing, it is possible to prevent water leakage from the screwed portion by using a sealing tape.

  Moreover, the connection method of the joint 1 for indirect drainage is not limited to said content, For example, after connecting the downstream side drain pipe end part 73a and the outflow side connection part 11 first, the upstream side drain pipe end part 71a and inflow You may make it connect with the side connection part 31. FIG.

  Moreover, as shown in FIG. 9, the joint 1 for indirect drainage can release the bayonet mechanism 17 in the state connected by piping, and can divide the water flow member 15 and the connection member 16 up and down. Therefore, the check valve 20 can be replaced from the gap between the water flow member 15 and the connection member 16 to perform maintenance work.

  Next, the main part of the present invention will be described. Specifically, the inner joint portion 30 will be described in detail.

  As shown in FIG. 10 and the like, at the lower end portion of the main body portion 35 of the inner joint portion 30, an opening portion 41 which is an inner water passing portion opened downward is formed. Then, the inner internal space 43 of the inner joint portion 30 and the outer internal space 12 corresponding to the outer side of the inner joint portion 30 communicate with each other through the opening 41.

  Further, from the inner peripheral surface in the vicinity of the opening 41 in the main body 35, the support 45 is extended toward the central axis L of the inner joint 30. In the present embodiment, the plurality of support portions 45 are arranged at equal intervals, and the tip portions of the respective support portions 45 are continuous at positions corresponding to the central axis L.

  Further, from the supporting portion 45, a transmitting portion 47 formed of an axial body is drawn out along the central axis L toward the lower side which is the downstream side of the opening 41.

  The upper surface of the support portion 45 is a surface inclined downward from the inner peripheral surface of the main body portion 35 to the transmission portion 47. With this configuration, the drainage that has flowed down along the inner circumferential surface of the main body portion 35 can be effectively guided to the transmission portion 47.

  Further, the upper end portion 47a of the transmission portion 47 has an apical shape that protrudes upward. With this configuration, the apical-shaped upper end portion 47 a can temporarily receive drainage that has fallen in the main body portion 35, and thereafter the drainage can be smoothly transmitted to the lower portion of the transmission portion 47.

  Further, a plurality of vanes 49 projecting in the radial direction with respect to the axis of the transmission portion 47 is provided in the transmission portion 47. With such a configuration, the surface area of the transmission portion 47 is expanded as a whole, and therefore, the waste water flowing out from the inside of the main body portion 35 of the inner joint portion 30 can be effectively collected.

  Moreover, the transmission part 47 has a tapered shape in which the outer diameter is reduced toward the downstream side (see FIGS. 10 c, e, f). At the same time, the shape of the vanes 49 is also such that the lateral width dimension of the vanes 49 becomes smaller toward the downstream side. As a result, the distance between the transmitting portion 47 and the slat plate portion 49 and the inner circumferential surface of the outer joint portion 10 increases toward the downstream side, and scattering of drain drainage to the outside is further suppressed. Furthermore, even if the inner joint portion 30 is obliquely inclined with respect to the outer joint portion 10 at the time of assembly, it is possible to prevent the transmission portion 47 from contacting the inner peripheral surface of the outer joint portion 10.

  Further, a tip end portion 47b which is a lower end portion of the transmission portion 47 has a tip shape which protrudes downward on the downstream side. As a result, the drainage can be concentrated on the tip portion 47b, and the drainage can be smoothly dropped to the downstream side therefrom.

  Furthermore, in the indirect drainage joint 1 in the present embodiment, the tip end portion 47 b of the transmission portion 47 corresponding to the lowermost end of the inner joint portion 30 in the state where the construction as shown in FIG. It is located in the lower stream side (lower side) than the outer side water flow part 13 in.

  With this configuration, drain drainage discharged from the drain pipe portion 71 into the inner joint portion 30 drips from the tip end portion 47 b of the transmission portion 47 disposed downstream of the outer water flow portion 13. Therefore, the drain drainage is prevented from being scattered to the outside through the outer water passing portion 13 of the outer joint portion 10.

  In the above-described embodiment, the dimensions and shape of each part can be freely selected as appropriate.

  Further, for example, as shown in FIG. 11, it is needless to say that the transmission portion 471 having a circular cross section not provided with the vane portion 49 may be adopted.

  In addition, instead of the configuration in which the check valve 20 as the trap means is attached, a device (trap means) is used which prevents insects and odors as the intruding material from entering upstream. It is also good.

  Moreover, the joint 1 for indirect drainage may be used for the path | route which discharges the rain water which flows through a gutter instead of the use form mentioned above. For example, the lower end portion of the rain gutter arranged on the upstream side is connected to the inflow side connection portion 31 of the indirect drainage joint 1, and the drainage connected to the rain water main pipe arranged on the downstream side to the outflow side connection portion 11 An arrangement is proposed in which the tubes are connected. The indirect drainage joint 1 having such a configuration has a function of indirectly draining the rainwater flowing from the upstream toward the rainwater main.

  Moreover, although it is desirable for the outer joint part 10 and the inner joint part 30 to be synthetic resin from the ease of shaping | molding, it is not limited to this.

  Further, as a configuration for connecting the water flow member 15 and the connection member 16, it is needless to say that another configuration may be adopted instead of the bayonet mechanism.

  Further, the check valve 20 is not limited to the above-described configuration, and may have a configuration using, for example, a float (floating member). Further, the check valve 20 is not essential.

  Moreover, the shape of the outer side water flow part 13 may be structures other than an above-described shape. However, if it is configured with an excessively large through hole, insects and the like may enter from the outside and interfere with the function of the indirect drainage joint 1, so it is desirable that the through hole has an appropriate dimension.

  Further, the engaged portion 32 does not have to be in the shape of a hexagonal column, and may have another shape. Further, for example, a hole may be provided into which a screw driver or the like can be inserted, and the screw or the like may be inserted into the hole to rotate the inner joint portion 30 around the axis. In addition, what is necessary is just to make the shape of the inflow side connection part 31 into the shape corresponding to this, when the upstream side drain pipe end part 71a is not male-screw shape but straight pipe shape.

1 Joint for indirect drainage 10 Outer joint portion 11 Outflow side connection portion 12 Outer internal space (internal space)
13 outer side water flow portion 30 inner joint portion 35 main body portion 31 inflow side connection portion 41 opening (inner water flow portion)
45 Support part 47, 471 Transmission part 47b Tip part 49 Plate part 71 Drain pipe part (upstream drainage pipe)
71a Upstream drainage pipe end 73 drainage pipe (downstream drainage pipe)
73a downstream drain end

Claims (5)

An upstream drainage pipe end formed at the downstream end of the upstream drainage pipe disposed upstream and from which the drainage flowing from the upstream flows out, and a downstream drainage pipe disposed downstream of the upstream drainage pipe The downstream end of the drainage pipe formed at the upstream end of the pipe, into which the drainage flowing from the upstream flows, and the upstream drainage end and the downstream drainage end are opposed in the vertical direction A joint for indirect drainage that connects the upstream drainage end and the downstream drainage end on the existing drainage passage portion,
An outer joint portion having an inner space, and an inner joint portion assembled at a nested shape so as to be slidable in the vertical direction with respect to the outer joint portion and having at least a main body portion through which drainage flows ,
At the downstream end of the outer joint portion, an outflow side connection portion to which the downstream drain pipe end portion is connected is formed, and the outer peripheral wall portion of the outer joint portion is the outer joint portion An outer water passage communicating the inner space of the outer joint with the outside of the outer joint portion,
Further, at the upstream end of the inner joint portion, an inflow side connection portion to which the upstream drain pipe end portion is connected is formed,
Furthermore, an opening is provided at the lower end portion of the main body portion of the inner joint portion, and the inner water flow portion communicating the inside and the outside of the main body portion is configured by the opening,
The inner peripheral surface of the main body portion of the inner joint portion is provided with a support portion drawn out toward the central axis of the inner joint portion, and the support portion is provided with the inner water flow portion. A joint for indirect drainage characterized in that a transmission part comprising a shaft-like body drawn out to the downstream side is provided. The joint for indirect drainage according to claim 1, wherein the lower end of the transmission portion is positioned more downstream than the lower end of the outer water flow portion. The joint for indirect drainage according to claim 1 or 2, wherein the lower end portion of the transmission portion has a tip shape protruding toward the downstream side. The transmission portion has a tapered shape in which the outer diameter is reduced toward the downstream side, and the separation distance from the inner peripheral surface of the outer joint portion is increased toward the downstream side. The joint for indirect drainage of any one of claim 3. The joint for indirect drainage according to any one of claims 1 to 4, wherein the transmission portion is provided with a vane plate portion protruding in a radial direction with respect to an axis of the transmission portion.

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