JP2008038384A - Drain unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a technology of enabling drain water to properly continue to be discharged from a drain pipe of equipment, while keeping the vicinity of a drain outlet clean by keeping it as dry as possible, in a drain unit for discharging the drain water, discharged from the equipment via a drain pipe, into a drain pipe via the drain outlet of a bathtub pan etc. <P>SOLUTION: This drain unit comprises: a tubular main-body tube portion 11 which is mounted in the drain outlet; a pipe-like joint portion 15 which guides the drain water D, received from inside the drain pipe, into the tube portion 11 by connecting the drain pipe and the tube portion 11 together; and a check valve 19 which is provided on the side of the lower end of the tube portion 11, which allows the circulation of drain water into the drain pipe from inside the tube portion 11, and which inhibits the backflow of the drain water into the tube portion 11 from inside the drain pipe. An overflow opening 22 allowing the drain water D in the tube portion 11 to overflow is formed on the side of the upper end of the tube portion 11. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a drainage unit for discharging drain water discharged from a drain pipe of a device into a drain pipe through a drain port.

In a bathroom unit where a bathtub drain pipe leading to the drain of the bathtub pan where the bathtub is installed is connected to a drain trap on the washing station side, a large amount of hot water such as drainage from the bathtub is drained from the washing station side. When discharged to the trap, the hot water may overflow from the outlet of the bathtub pan through the bathtub drain pipe, and the bathtub pan may become unclean.
Therefore, as a drainage structure in the bathroom unit for keeping the bathtub pan as dry and clean as possible, a check valve is provided in the drain opening of the bathtub pan and the bathtub drain pipe, and the bathtub is discharged from the drain trap on the washing place side. What was comprised so that the reverse flow of the waste_water | drain to the drain outlet of a bread | pan is known is known (for example, refer patent document 1).

  For example, as a device related to a bathroom and requiring drain water to be discharged, the following latent heat recovery type hot water heater (see, for example, Patent Document 2) or mist device (for example, Patent Document) 3 is known).

That is, the latent heat recovery type hot water heater is configured to recover not only the sensible heat of combustion gas but also the condensation latent heat of water vapor in the combustion gas to supply hot water to a bathroom or the like, and the water vapor is condensed. Condensed water generated in this way is discharged as drain water.
On the other hand, the mist device is configured to inject hot water mist from a mist nozzle into a bathroom and use the bathroom as a sauna space, and residual water or the like in a pipe leading to the mist nozzle is discharged as drain water. .

  In addition, these latent heat recovery type hot water heaters and mist devices are drained on the side of the tub pan where the bathtub is installed in the bathroom so that the drain pipe for discharging drain water is not visible to the user. It arrange | positions so that an edge part may be located in the mouth vicinity, and it is comprised so that the drain water which flowed out from the said edge part may flow in into a drain outlet after being received by the said bathtub pan, and is discharged | emitted.

JP 2003-253722 A JP 2006-138527 A JP 2005-152197 A

In devices such as the latent heat recovery type water heater and mist device as described above, when the end of the drain pipe for discharging drain water is located so as to be located near the drain outlet of the bathroom such as a bathtub pan, Due to the drain water flowing out from the end of the drain pipe, the vicinity of the drainage of the bathtub pan is particularly wet, and it becomes easy to become unclean. Therefore, even if the end is held above the drain by using a holding tool so that the drain water flowing out from the end of the drain pipe is directly dropped into the drain, a part of the drained drain water is used. Will collide with the edge of the drain outlet and the eye plate and splash around.
In particular, when there are a plurality of devices that need to discharge the drain water, it is difficult to properly arrange the end portions of the drain pipes of the plurality of devices so that the vicinity of the drain outlet is not wet as much as possible. In addition, the drain water flowing out from the end portions of the plurality of drain pipes wets the vicinity of the drain port in a wider range, and becomes more filthy.

  In order to prevent the drain water flowing out from the end of the drain pipe of the equipment from getting wet near the drain outlet of the bathtub pan or the like, it is conceivable to connect the drain pipe directly to the bathtub drain pipe. However, when the check valve provided in the bathtub pan drain or the bathtub drain pipe for keeping the bathtub pan clean as described above is in the closed state, the drain water discharge from the drain pipe is blocked. It will be stopped, causing problems such as drain water flowing back to the equipment side.

  This invention is made | formed in view of said subject, The objective is for discharging | emitting drain water discharged | emitted from an apparatus via a drain pipe in a drain pipe via drain outlets, such as a bathtub pan. In the drainage unit, it is to provide a technique capable of satisfactorily continuing the drain water drainage from the drain pipe of the equipment while keeping the vicinity of the drain outlet as dry and clean as possible.

In order to achieve the above object, a drainage unit according to the present invention is a drainage unit for draining drain water discharged from a drain pipe of equipment into a drain pipe through a drain outlet, and has a first characteristic configuration. Is a cylindrical main body cylinder portion attached to the drain outlet;
A tubular joint for connecting the drain pipe and the main body cylinder part and guiding drain water received from within the drain pipe into the main body cylinder part;
A non-return valve provided on the lower end side of the main body cylinder part, allowing a flow of drainage from the main body cylinder part into the drain pipe, and preventing a reverse flow of drainage from the drain pipe into the main body cylinder part. ,
In the upper end side of the main body cylinder portion, an overflow opening for overflowing drain water in the main body cylinder portion is formed.

According to the first characteristic configuration, the drain water discharged from the device via the drain pipe is inserted into the main body cylinder portion attached to a drain outlet provided in a bathtub pan or the like of the bathroom via the joint portion. Since it can guide appropriately, drain water can be prevented from scattering near the drain, and the vicinity of the drain can be maintained in a clean state.
Then, when the check valve is in an open state to allow the flow of drainage from the main body cylinder portion into the drain pipe, the drain water introduced into the main body cylinder portion is checked in an open state. It can discharge | emit appropriately in the said drain pipe through a valve.
On the other hand, when the check valve is in a closed state to prevent backflow from the drain pipe connected to the drain trap or the like on the washing place side into the main body cylinder, the drain introduced into the main body cylinder Water stays in the main body cylinder and can be discharged into the drain pipe when the check valve is next opened. Furthermore, even when the inside of the main body cylinder is filled with drain water when the check valve is closed, the drain water can be overflowed through the overflow opening, It is possible to continue the drainage of the drain water from the drain pipe without delaying.

  According to a second characteristic configuration of the drainage unit according to the present invention, in addition to the first characteristic configuration, the check valve is cantilevered by the support portion fixed to the main body cylinder portion and the support portion. It is in the point comprised by the valve body part which can contact | abut and space apart with respect to the lower end side opening of a main body cylinder part.

According to the second characteristic configuration, a relatively simple and inexpensive configuration constituted by the support portion and the valve body portion can be adopted as the check valve.
That is, when a large amount of hot water, such as drainage in a bathtub, is discharged to the drain trap on the washing station side, if the pressure in the drain pipe rises with respect to the pressure in the main body cylinder, the reverse Since the valve body portion of the stop valve contacts the lower end side opening of the main body cylinder portion and closes the lower end side opening, it is possible to appropriately prevent the backflow of drainage from the drain pipe into the main body cylinder portion.
On the other hand, for example, when drain water stays in the main body cylinder portion and the pressure in the main body cylinder portion rises with respect to the pressure in the drain pipe, the valve body portion of the check valve is Since the lower end side opening is opened away from the lower end side opening of the main body cylinder portion, the drain water introduced into the main body cylinder portion can be appropriately discharged into the drain pipe.

  According to a third feature of the drainage unit of the present invention, in addition to any of the first to second features, the opening cross-sectional area in the overflow opening is greater than the flow-path cross-sectional area in the joint. Is also set to be large.

  According to the third characteristic configuration, the pressure loss when the drain water overflows through the overflow opening is appropriately reduced with respect to the pressure loss when the joint portion guides the drain water into the main body cylinder portion. can do. Therefore, even when the check valve is closed and the inside of the main body cylinder is full of drain water, the drain water is overflowed well through the overflow opening and connected to the joint. It is possible to improve the drainage of the drain pipe without delaying the drainage.

  In addition to any one of the first to third characteristic configurations, the fourth characteristic configuration of the drainage unit according to the present invention is such that the joint portion is the upper end of the main body cylindrical portion. The drain pipe side connection portion is connected to the drain pipe in a horizontal direction so as to be rotatable about a vertical axis.

  According to the fourth characteristic configuration, the joint portion is formed in a so-called L-shape that extends upward from the upper end side of the main body cylinder portion and then bends in the horizontal direction, and further, the upper end side of the main body cylinder portion. The connecting portion is configured to be rotatable about a vertical axis. Therefore, the connection part with respect to the said drain pipe can be orient | assigned to the arbitrary directions of a horizontal direction, for example, the handling of the said drain pipe and the connection to the said joint part can be made simple.

  The fifth characteristic configuration of the drainage unit according to the present invention is that, in addition to any one of the first to fourth characteristic configurations, the main body cylinder is attached to a drain of a bathtub pan in which a bathtub is installed. It is in.

  According to the fifth feature configuration, by attaching the main body cylinder part to the drain of the bathtub pan where the bathtub is installed, as described above, the vicinity of the drain of the bathtub pan is kept as dry as possible to be clean. Further, when the check valve is closed, the inside of the main body cylinder is filled with drain water, and even when the drain water overflows through the overflow opening, The overflow drain water can be received by the bathtub pan and discharged from another drain port, or can be discharged from the drain port provided with the drain unit when the check valve is opened next.

  The sixth characteristic configuration of the drainage unit according to the present invention, in addition to any one of the first to fifth characteristic configurations described above, also collects the condensation latent heat of water vapor in the combustion gas to the bathroom as the joint portion. A water heater joint that is connected to the drain pipe of a latent heat recovery type water heater that supplies hot water, and a mist device joint that is connected to the drain pipe of a mist apparatus that injects mist from the mist nozzle into the bathroom. It is in.

According to the sixth characteristic configuration, the joint portion is not limited to one, and a plurality of joint portions can be provided.
Moreover, as the equipment that needs to discharge drain water as equipment related to the bathroom, there are the latent heat recovery type hot water heater and the mist device, so the hot water supply for connecting the drain pipes of these respective equipments. High versatility can be realized by providing the joint part for a device and the joint part for a mist device.

An embodiment of a drainage unit according to the present invention will be described based on the drawings.
As shown in FIG. 1, in a bathroom 1, a bathtub 2 is installed on a bathtub pan 3, and drainage received by the bathtub pan 3 and drainage from the washing place 4 are passed through a drain trap 5 to a miscellaneous drain pipe 6. Discharged.

  Moreover, the bathroom 1 is provided with the water heater 30 and the mist apparatus 40 as equipment which needs to discharge | release drain water D, and demonstrates the structure of these apparatuses below.

  The water heater 30 is configured to supply hot water to the bathroom 1 and the like by recovering not only the sensible heat of the combustion gas but also the condensation latent heat of water vapor in the combustion gas, as in a known latent heat recovery type water heater. Yes. In this type of water heater 30, the condensed water generated by condensation of the water vapor is discharged as drain water D through the drain pipe 38.

The configuration of the water heater 30 will be described. The primary heat exchange for recovering the sensible heat of the combustion gas in the combustion gas passage 32 through which the combustion gas generated by burning the gas in the burner 31 circulates. And a secondary heat exchanger 34 for recovering the latent heat of water vapor in the combustion gas are arranged in order from the upstream side in the flow direction of the combustion gas. Then, by supplying water in the order of the secondary heat exchanger 34 and the primary heat exchanger 33, the water is heated by the latent heat and sensible heat of the combustion gas to become hot water, and the hot water passes through the hot water supply pipe 35. It supplies to the bathtub 2, the mist apparatus 40 mentioned later, and another hot-water supply part.
Further, in the water heater 30, the condensed water generated by the condensation of water vapor in the combustion gas in the secondary heat exchanger 34 is received by a condensed water receiver 36 disposed below the secondary heat exchanger 34. After being appropriately neutralized by the neutralizer 37, it is discharged as drain water D through the drain pipe 38.

  On the other hand, the mist device 40 is a so-called bathroom heating dryer having a heating unit 41 for heating the bathroom 1 using heating water (not shown) circulated and heated by the water heater 30 as a heat source, as in the known mist device. Further, the mist nozzle 42 is configured to inject the mist of hot water supplied from the water heater 30 into the bathroom 1 from the mist nozzle 42 and use the bathroom as a sauna space. In this type of mist device 40, residual water or the like in the hot water supply pipe 35 leading to the mist nozzle 42 is discharged as drain water D through the drain pipe 43.

The bathtub pan 3 in which the bathtub 2 is installed is provided with a substantially circular bathtub drain port 7 and a drain receiver 8 for receiving drainage flowing into the bathtub drain port 7, and the drain receiver 8 is connected via a bathtub drain pipe 9. And connected to a drain trap 5.
That is, the waste water that flows into the drain receiver 8 from the bathtub drain port 7 is discharged to the drain trap 5 and the miscellaneous drain pipe 6 through the bathtub drain pipe 9 described above.

  Further, the drain water D discharged through the drain pipes 38 and 43 of the water heater 30 and the mist device 40 is appropriately supplied to the bathtub drain 7 through the bathtub drain 7. And the drainage unit 10 for discharging | emitting to the miscellaneous drainage pipe 6 side is provided, and the detailed structure of this drainage unit 10 is demonstrated below.

As shown in FIGS. 2 to 5, the drainage unit 10 includes a cylindrical main body cylinder portion 11 attached to the bathtub drainage port 7 and a relatively low height, and drain pipes 38 and 43 and the main body cylinder portion 11. A tubular joint portion 15 that connects and guides drain water D received from the drain pipes 38 and 43 into the main body cylinder portion 11 and a lower end side of the main body cylinder portion 11. A non-return valve 19 is provided to allow the flow of the drainage into the drainage pipe 9 and prevent the drainage of the drainage from the bathtub drainage pipe 9 into the main body cylinder part 11. Further, the upper end of the main body cylinder part 11 is provided. On the side, an overflow opening 22 for overflowing the drain water D in the main body cylinder portion 11 is formed.
Further, in the present embodiment, as the joint portion 15, the water heater joint portion 15 </ b> A connected to the drain pipe 38 of the water heater 30 as the latent heat recovery type water heater described above, and the mist device 40 as the mist device described above. A plurality of joint portions 15 with joint portions 15B for mist devices connected to the drain pipe 43 are provided.
Since a larger amount of drain water D may be discharged to the drain pipe 43 of the mist device 40 than the drain pipe 38 of the water heater 30, the flow path disconnection in the joint portion 15 </ b> B for the mist device may occur. The area is set slightly larger than the flow path cross-sectional area in the water heater joint 15A.

  And the drainage unit 10 comprised as mentioned above is installed in the form which attaches the said main body cylinder part 11 to the circular bathtub drainage port 7, and also installs it in the said hot water heater 30 and the said mist apparatus 40 mentioned above. The drain pipes 38 and 43 are connected to the water heater joint 15A and the mist device joint 15B of the drainage unit 10, respectively. Therefore, the drain water D discharged through the respective drain pipes 38 and 43 does not scatter in the vicinity of the bathtub drain port 7, and the main body cylinder portion 11 attached to the bathtub drain port 7 through the joint portion 15. Will be guided appropriately.

That is, when the check valve 19 is in an open state to allow the flow of drainage from the main body cylinder portion 11 into the bathtub drain pipe 9 (see FIG. 4A), the main body cylinder The drain water D introduced into the portion 11 is appropriately discharged to the bathtub drain pipe 9 side through the check valve 19 in the open state.
On the other hand, when the check valve 19 is in a closed state to prevent a back flow from the bathtub drain pipe 9 into the main body cylinder portion 11 (see FIG. 4B), the main body cylinder portion 11. The drain water D introduced into the inside stays in the main body cylinder portion 11.
Then, the drain water D staying in the main body cylinder portion 11 is discharged into the bathtub drain pipe 9 when the check valve 19 is next opened. Even when the inside of the main body cylinder portion 11 is filled with the drain water D while the main body 11 is closed, the drain water D overflows through the overflow opening 22, so that the drain pipes 38 and 43 The drain water D is continuously discharged without delay.
Further, the drain water D overflowing into the bathtub pan 3 through the overflow opening 22 in this manner is discharged from another drain outlet such as the drain trap 5. If the drainage unit 10 is installed in the bathtub pan 3 so that the upper end surface of the main body cylinder portion 11 is flush with the upper surface of the bathtub pan 3, the check valve 19 is opened next. Then, the drain water D overflowed to the bathtub pan 3 can be received again into the main body cylinder portion 11 and discharged from the bathtub drain port 7 provided with the drain unit 10.

Further, referring to FIGS. 4 and 5, the check valve 19 is cantilevered by the support portion 20 fixed to the fixing portion 14 provided outside the main body cylinder portion 11, and is supported by the support portion 20. It is comprised with the valve body part 21 contact | abutted and spaceable with respect to the lower end side opening of the cylinder part 11. As shown in FIG.
Specifically, the check valve 19 uses a substantially disk-shaped member made of an elastic material such as an elastomer, and is supported by being fixedly locked to an opening formed near the outer periphery of the main end cylindrical portion 11 on one end side. While forming the part 20, it is comprised so that it may become the said valve body part 21 which can rock | fluctuate up and down at the other end side.

Then, as shown in FIG. 4B, the pressure in the drain receiver 8 below the check valve 19 (that is, the pressure in the bathtub drain pipe 9) is the pressure in the main body cylinder 11 above the check valve 19. When the check valve 19 is raised, the valve body portion 21 of the check valve 19 is brought into contact with the lower end side opening of the main body cylinder portion 11 and the lower end side opening is closed. Backflow of drainage into the portion 11 is appropriately prevented.
In addition, as described above, when the check valve 19 is in the closed state and the inside of the main body cylinder portion 11 is filled with the drain water D, the drain water D is supplied to the overflow opening. 22 will overflow.

  On the contrary, as shown in FIG. 4A, when the drain water D stays in the main body cylinder portion 11, the pressure in the main body cylinder portion 11 becomes the pressure in the drainage receptacle 8 (that is, the bathtub drain pipe 9). In the main body cylinder portion 11, the valve body portion 21 of the check valve 19 is separated from the lower end side opening of the main body cylinder portion 11 and the lower end side opening is opened. The led drain water D is appropriately discharged into the bathtub drain pipe 9 through the drain receiver 8.

  Further, even when the check valve 19 is closed and the inside of the main body cylinder portion 11 is filled with the drain water D, the drain water D in the drain pipes 38 and 43 is prevented from being delayed. The sum of the opening cross-sectional areas in the overflow opening 22 is the flow cross-sectional area in the joint 15 (the flow path of the water heater joint 15A so that the water D overflows well through the overflow opening 22). The sum of the cross-sectional area and the flow-path cross-sectional area of the joint portion 15B for the mist device) is set larger.

As shown in FIGS. 2 and 5, the main body cylinder portion 11 has a flange portion 13 projecting radially on the outer peripheral portion, and a locking portion 12 formed radially on the lower end side of the outer peripheral portion, for example, resin. It is configured as a molded body made of metal.
Therefore, the main body cylinder portion 11 is inserted into the bathtub drain port 7, the lower surface of the flange portion 13 abuts on the upper surface of the bathtub pan 3, and the locking portion 12 formed on the lower end side outer peripheral portion is the bathtub drainage. By being locked to the lower end side edge portion of the mouth 7, it can be attached to the bathtub drainage port 7 in a state of being rotatable around the vertical axis.
Therefore, when attaching the main body cylinder portion 11 to the bathtub drainage port 7, the main body cylinder portion 11 can be rotated around the vertical axis so that the plurality of joint portions 15 are in appropriate positions.

On the other hand, the joint portion 15 is connected so that the connection portion 16 on the main body cylinder portion 11 side is rotatable about the vertical axis with respect to the upper end side of the main body cylinder portion 11, and the connection portion 18 on the drain pipes 38 and 43 side. Is configured to be connected to the drain pipe in the horizontal direction.
Specifically, the joint portion 15 is configured as a so-called L-shaped molded body formed in a so-called L-shape that extends upward from the upper end side of the main body cylinder portion 11 and then bends in the horizontal direction. Yes.
Further, the connecting portion 16 on the main body cylinder portion 11 side is inserted into an opening formed on the upper end side of the main end cylinder portion 11, and the engaging portion 17 formed on the tip thereof is connected to the lower end side edge of the opening. And is connected to the upper end side of the main cylinder 11 so as to be rotatable about a vertical axis.
Therefore, by rotating the joint portion 15 about the vertical axis, the connecting portion 18 connected to the drain pipes 38 and 43 can be directed in an arbitrary direction in the horizontal direction, and the drain pipes 38 and 43. And the connection to the joint portion 15 is simple.

[Another embodiment]
(1) In the above embodiment, the hot water heater 30 and the mist device 40 have been described as examples of devices that discharge drain water through the drain pipes 38 and 43. However, the present invention is not limited to these devices. Instead, the drain water discharged from the drain pipe of another device can be configured to be discharged into the drain pipe through the drain port.

(2) In the above embodiment, the two joint portions 15 of the water heater joint portion 15A and the mist device joint portion 15B are provided, but the number of joint portions can be increased or decreased as necessary.

(3) In the above-described embodiment, the check valve 19 provided on the lower end side of the main body cylinder portion 11 is fixed to the fixing portion 14 provided outside the main body cylinder portion 11, and the support portion. 20 comprises a valve body portion 21 that is cantilevered and supported by a lower end side opening of the main body cylinder portion 11 and can be separated from the lower end side opening of the main body cylinder portion 11, but the lower end opening of the main body cylinder portion 11 is closed by a float For example, a check valve having another configuration may be adopted.

(4) In the above-described embodiment, the main body cylinder portion 11 has a cylindrical shape with a relatively low height. However, the height, the cross-sectional shape, and the like can be appropriately changed.
Further, by changing the height of the main body cylinder portion, the amount of drain water staying in the main body cylinder portion when the check valve is in the closed state can be changed.

(5) In the above embodiment, the opening cross-sectional area in the overflow opening 22 is set larger than the flow path cross-sectional area in the joint 15, but the drain water staying in the main body cylinder overflows well. You may change the opening cross-sectional area in the opening part 22 for overflow within the range to obtain.

(6) In the above-described embodiment, the joint portion 15 is connected so that the connection portion 16 on the main body cylinder portion 11 side is rotatable about the vertical axis with respect to the upper end side of the main body cylinder portion 11. The connecting portion 18 on the side is configured to be connected to the drain pipes 38 and 43 in the horizontal direction. However, the shape of the joint portion and the connection form with respect to the main body cylinder portion and the drain pipe may be appropriately changed. .

(7) In the said embodiment, although comprised so that the main body cylinder part 11 might be attached to the bathtub drainage port 7 of the bathtub pan 3 in which the bathtub 2 is installed, the main body cylinder part 11 is attached to another drainage port inside and outside the bathtub. You may comprise as follows.

  A drainage unit according to the present invention is a drainage unit for discharging drain water discharged from a device through a drain pipe into a drain pipe through a drain port such as a bathtub pan, and the vicinity of the drain port as much as possible. It can be effectively used as one that can continuously drain drain water from the drain pipe of the equipment while keeping it dry and clean.

The figure which shows the drainage state of drain water in a bathroom, and the installation state of a drainage unit Side sectional view showing the state where the drainage unit is installed at the drainage outlet Top view of drainage unit Elevated cross-sectional view showing the open / close state of the check valve in the drainage unit Disassembled perspective view of drainage unit

Explanation of symbols

1: Bathroom 2: Bathtub 3: Bathtub pan 6, 9: Drain pipe 7: Drain port 10: Drainage unit 11: Main body cylinder portion 15: Joint portion 15A: Joint portion 15B for hot water heater: Joint portion 16, 18 for mist device Connection part 19: Check valve 20: Support part 21: Valve body part 22: Overflow opening 30: Water heater 40: Mist device 38, 43: Drain pipe D: Drain water

Claims (6)

A drainage unit for discharging drain water discharged from a drain pipe of equipment into a drain pipe through a drain port,
A cylindrical main body cylinder part attached to the drain;
A tubular joint for connecting the drain pipe and the main body cylinder part and guiding drain water received from within the drain pipe into the main body cylinder part;
A non-return valve provided on the lower end side of the main body cylinder part, allowing a flow of drainage from the main body cylinder part into the drain pipe, and preventing a reverse flow of drainage from the drain pipe into the main body cylinder part. ,
A drainage unit in which an opening for overflow is formed on the upper end side of the main body cylinder portion to allow the drain water in the main body cylinder portion to overflow.   The check valve includes a support portion that is fixed to the main body cylinder portion, and a valve body portion that is cantilevered by the support portion and is capable of contacting and separating from a lower end side opening of the main body cylinder portion. The drainage unit according to claim 1.   The drainage unit according to claim 1 or 2, wherein an opening cross-sectional area in the overflow opening is set larger than a flow passage cross-sectional area in the joint.   The joint portion is connected such that a connection portion on the main body cylinder portion side is rotatable about a vertical axis with respect to an upper end side of the main body cylinder portion, and the connection portion on the drain pipe side is horizontal with respect to the drain pipe. The drainage unit according to any one of claims 1 to 3, wherein the drainage unit is configured to be connected in a direction.   The drainage unit according to any one of claims 1 to 4, wherein the main body cylinder part is attached to a drainage outlet of a bathtub pan in which a bathtub is installed.   As the joint part, a water heater joint part connected to the drain pipe of a latent heat recovery type water heater that collects the condensation latent heat of water vapor in the combustion gas and supplies hot water to the bathroom, and mist is injected from the mist nozzle into the bathroom The drainage unit as described in any one of Claims 1-5 provided with the joint part for mist apparatuses connected to the drain pipe of the mist apparatus to perform.

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