Drainage device

Abstract

To provide a drainage device capable of suppressing foam from flowing out from an overflow pipe into a bowl.SOLUTION: A drainage device 10 comprises: a bowl 11; a first opening 12 located at the bottom of the bowl 11; a second opening 15 located at a position higher than the first opening 12 in the bowl 11; a drain pipe 13 extending downward from the first opening 12; a trap 14 located below the drain pipe 13 and curved in an S-shape; an overflow pipe 16 connecting the drain pipe 13 and the second opening 15; and a defoaming part 18 located in the overflow pipe 16 and configured to eliminate foam.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a drainage device provided with an overflow.

Background Art

[0002] The drainage device of Patent Document 1 includes a bowl portion, a drain port flow path extending downward from the drain port, and an overflow flow path. The bowl portion has a first wall on the back side, a second wall on the front side, a third wall provided on the side of the first wall, and a fourth wall on the side opposite to the third wall. The overflow flow path extends from an overflow hole formed in the third wall through the outside of the bowl portion to the drain port flow path below the drain port.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] A water seal is provided in the drain port flow path of the drainage device to prevent the intrusion of malodors or insects. When a detergent with good foaming properties or the like accumulates in the drain port flow path, a large amount of foam may be generated due to the inflow of water. The generated foam can flow back through the overflow flow path and out into the bowl portion.

[0005] The present invention has been made in view of the above-described circumstances, and an object thereof is to provide a drainage device capable of suppressing the outflow of foam from the overflow pipe into the bowl.

Means for Solving the Problems

[0006] (1) The drainage device according to claim 1 includes a bowl, a first opening located at the bottom of the bowl, a second opening located at a position higher than the first opening in the bowl, a drain pipe extending downward from the first opening, a trap located below the drain pipe and curved in an S shape, an overflow pipe connecting the drain pipe and the second opening, and an antifoaming portion located in the overflow pipe for eliminating bubbles.

[0007] Since the antifoaming portion eliminates the bubbles entering from the drain pipe into the overflow pipe, the outflow of bubbles from the second opening into the bowl is suppressed.

[0008] (2) Claim 2 further includes a cover, the cover has a main body, legs extending from the main body, and a third opening, the legs can be engaged with the second opening, and the antifoaming portion is connected to the cover. The drainage device according to claim 1.

[0009] By engaging the legs of the cover with the second opening, the antifoaming portion is located in the overflow pipe. Through the third opening, the water accumulated in the bowl flows out to the overflow pipe. When the legs of the cover are removed from the second opening, the antifoaming portion is removed from the overflow pipe together with the cover. Thereby, maintenance of the antifoaming portion can be easily performed.

[0010] (3) Claim 3 is the drainage device according to claim 1 or 2, wherein the tip of the antifoaming portion is a needle pointing toward the drain pipe.

[0011] The bubbles break when the needle-shaped tip contacts the bubbles.

[0012] (4) Claim 4 is the drainage device according to claim 1 or 2, wherein the antifoaming portion is a resistor that generates heat when energized.

[0013] When the bubbles are heated, the gas inside the bubbles expands and the bubbles break.

[0014] (5) Claim 5 is the drainage device according to claim 4, wherein the tip of the resistor is a needle pointing towards the drain pipe.

[0015] When the needle-shaped tip contacts the bubbles, the bubbles burst.

[0016] (6) Claim 6 is the drainage device according to claim 4, further comprising a sensor located in the overflow pipe for detecting bubbles, and a switch for switching the energization state of the resistor based on a signal output by the sensor.

[0017] When the sensor detects bubbles, the switch switches to energize the resistor. Since the resistor is energized when there are bubbles in the overflow pipe, the outflow of bubbles from the second opening to the bowl can be suppressed while suppressing power consumption.

[0018] (7) Claim 7 is a drainage device further comprising a fan, wherein the defoaming part has a flow path with an opening facing the drain pipe, and the fan blows air into the flow path, according to claim 1 or 2.

[0019] When the air blown by the fan is blown onto the bubbles from the opening of the defoaming part, the film of the bubbles is broken, so the outflow of bubbles from the second opening to the bowl is suppressed.

[0020] (8) Claim 8 is the drainage device according to claim 7, further comprising a heater for heating the air blown by the fan.

[0021] When warm air is blown onto the bubbles, the film of the bubbles is more likely to break. Therefore, the outflow of bubbles from the second opening to the bowl can be more reliably suppressed.

[0022] (9) Claim 9 is the drainage device according to claim 8, further comprising a sensor located in the overflow pipe for detecting bubbles, and a switch for switching the energization state of the fan based on a signal output by the sensor.

[0023] When the sensor detects bubbles, the switch is switched so as to energize the fan. Since the fan is energized when there are bubbles in the overflow pipe, it is possible to suppress the outflow of bubbles from the second opening to the bowl while suppressing power consumption.

Advantages of the Invention

[0024] According to the present invention, it is possible to suppress the outflow of bubbles from the overflow pipe to the bowl.

Brief Description of the Drawings

[0025]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Modes for Carrying Out the Invention

[0026] Hereinafter, with reference to the drawings, a drainage device 10 according to an embodiment of the present invention will be described. It should be noted that the embodiments described below are merely examples of the present invention, and it goes without saying that the embodiments of the present invention can be appropriately changed without changing the gist of the present invention.

[0027] In the following description, in a state where the washbasin 1 is installed in a house, the vertical direction is referred to as the up-down direction 7, the direction from the user to the washbasin 1 is referred to as the forward direction, and the opposite direction is referred to as the backward direction. The forward direction and the backward direction together are referred to as the front-back direction 8. The direction orthogonal to the up-down direction 7 and the front-back direction 8 is referred to as the left-right direction 9.

[0028] [First Embodiment] The drainage device 10 is provided in the washbasin 1 installed in a washroom of a house or the like. The drainage device 10 is a device for discharging the liquid in the bowl 11 from the house. As shown in FIG. 1, the drainage device 10 includes a bowl 11, a first opening 12, a drain pipe 13, a trap 14, a second opening 15, an overflow pipe 16, a cover 17, and an antifoaming part 18.

[0029] The bowl 11 is located below the faucet and can store the liquid. As shown in FIG. 1, the bowl 11 is a concave container that opens upward. The bowl 11 has a predetermined depth. The first opening 12 is an opening through which the liquid supplied or stored in the bowl 11 is discharged. The first opening 12 is located at the bottom of the bowl 11. The first opening is circular when viewed from the vertical direction 7.

[0030] The drain pipe 13 extends downward from the bottom of the bowl 11. The drain pipe 13 communicates with the first opening 12. The drain pipe 13 is located at the most upstream of the pipes for guiding the liquid discharged from the first opening 12 to the outside of the house.

[0031] The trap 14 is a pipe arranged to prevent the intrusion of insects or the backflow of odors. The trap 14 is formed in an S shape. More specifically, the trap 14 extends downward from the lower end of the drain pipe 13, curves upward from the extended tip, extends above the lower end of the drain pipe 13, and further extends downward. The liquid discharged from the bowl 11 is always stored in the trap 14. In the trap 14, a large amount of bubbles may be generated when the liquid containing a foaming detergent is drained from the bowl 11.

[0032] The second opening 15 is an opening positioned below the edge of the bowl 11 so that liquid does not overflow from the bowl 11. The second opening 15 is positioned above the first opening 12. The second opening 15 is circular when viewed from the front-rear direction 8. When liquid is supplied to the bowl 11 with the first opening 12 plugged, the liquid can be stored up to the height of the second opening 15.

[0033] The overflow pipe 16 guides the liquid discharged from the second opening 15 to the drain pipe 13. The overflow pipe 16 communicates with the second opening 15 and the drain pipe 13. The overflow pipe 16 has a first flow path 23 and a second flow path 24. The first flow path 23 is a flow path that extends upward from the peripheral wall of the drain pipe 13. The first flow path 23 extends upward along the bowl 11. The upper end of the first flow path 23 is connected to the second flow path 24. The second flow path 24 communicates with the second opening 15. The second flow path 24 extends rearward from the upper end of the first flow path 23. When a large amount of bubbles are generated in the trap 14, the bubbles flow backward from the drain pipe 13 into the first flow path 23 and the second flow path 24.

[0034] The cover 17 is detachably attached to the second opening 15. As shown in FIG. 2(a), the cover 17 has a main body 30, legs 31, and a contact portion 37. The main body 30 is positioned behind the second opening 15 when the cover 17 is attached to the second opening 15. The main body 30 has a first surface 32, a second surface 33, and an outer peripheral surface 34.

[0035] The first surface 32 is a surface facing forward in the main body 30. The first surface 32 is circular when viewed from the front. The outer diameter of the first surface 32 is larger than that of the second opening 15. The second surface 33 is a surface facing rearward in the main body 30. The second surface 33 is circular when viewed from the rear. The outer peripheral surface 34 is a surface connecting the first surface 32 and the second surface 33. The outer peripheral surface 34 is a peripheral surface whose central axis is parallel to the front-rear direction 8.

[0036] The leg portion 31 can be engaged with the second opening 15. As shown in FIGS. 2(a) and 2(b), the leg portion 31 is in a rod shape extending forward from the first surface 32. Three leg portions 31 are arranged on the first surface 32. Each leg portion 31 is located at a constant distance radially outward from the center C on the first surface 32. Each leg portion 31 is located at a predetermined angle around the center C on the first surface 32. In a state where the leg portion 31 is engaged with the second opening 15, the leg portion 31 abuts against the inner peripheral surface 35 of the second opening 15.

[0037] The abutting portion 37 protrudes forward from the first surface 32. The abutting portion 37 is in the shape of a quadrangular prism. Three abutting portions 37 are arranged on the first surface 32. Each abutting portion 37 is located spaced apart from each leg portion 31 at a position radially outward of each leg portion 31. The abutting portion 37 abuts against the second opening 15 in a state where the cover 17 is positioned at the second opening 15.

[0038] The third opening 36 is formed in a state where the leg portion 31 is engaged with the second opening 15. The third opening 36 is a space located between the bowl 11 and the main body 30. The third opening 36 communicates with the second opening 15. That is, the first surface 32 of the main body 30 of the cover 17 does not seal the second opening 15. Therefore, in a state where the leg portion 31 is engaged with the second opening 15, the liquid stored in the bowl 11 flows through the third opening 36 and the second opening 15 to the overflow pipe 16.

[0039] The defoaming portion 18 abuts against the foam to eliminate the foam. As shown in FIG. 3, the defoaming portion 18 is located in the overflow pipe 16 in a state where the cover 17 is positioned at the second opening 15. The defoaming portion 18 is connected to the cover 17 by a connecting portion 40. For example, a stainless - steel ball chain is used for the connecting portion 40. The defoaming portion 18 is detached from the overflow pipe 16 when the cover 17 is detached from the second opening 15, and is located in the overflow pipe 16 when the cover is positioned at the second opening 15. The defoaming portion 18 has a main body portion 41 and a needle 42.

[0040] The main body portion 41 is located in the first flow path 23 while being connected to the connecting portion 40. The main body portion 41 is made of a metal such as stainless steel or iron. A plurality of needles 42 are connected to the main body portion 41. The needles 42 are made of synthetic resin and have flexibility. The tip portion of the needle 42 extends along the first flow path 23. The tip of the needle 42 faces the drain pipe 13 so as to contact the bubbles flowing backward through the overflow pipe 16.

[0041] Note that the position of the defoaming portion 18 in the overflow pipe 16 is not particularly limited. However, if it is close to the drain pipe 13, it is preferable because the bubbles entering the overflow pipe 16 from the drain pipe 13 can be defoamed near the drain pipe 13. Also, the length of the main body portion 41 of the defoaming portion 18 and the number of needles 42 are not particularly limited. However, it is preferable that the longer the main body portion 41 and the larger the number of needles 42, the greater the defoaming effect.

[0042] [Operation and Effect of the First Embodiment] According to the drainage device 10 described above, the bubbles generated in the trap 14 and entering the overflow pipe 16 from the drain pipe 13 contact the tip of the needle 42 of the defoaming portion 18, and the film forming the bubbles is broken. When the bubbles are broken in the overflow pipe 16, the outflow of the bubbles from the second opening 15 to the bowl 11 is suppressed.

[0043] Also, when the cover 17 is positioned at the second opening 15, the defoaming portion 18 connected to the cover 17 is located inside the overflow pipe 16. At this time, the liquid accumulated in the bowl 11 can flow out into the overflow pipe 16 through the third opening 19. On the other hand, when the cover 17 is removed from the second opening 15, the defoaming portion 18 is taken out of the overflow pipe 16 together with the cover 17. Therefore, maintenance of the defoaming portion 18 can be easily performed.

[0044] [Second Embodiment] In the drainage device 10 according to the first embodiment described above, the needle 42 of the defoaming portion 18 breaks the film of the bubbles, but the configuration is not limited to this. The drainage device 10A may have a defoaming portion 18A that is a resistor that generates heat when energized.

[0045] As shown in FIGS. 4 and 5, the defoaming unit 18A of the drainage device 10A according to the second embodiment has a needle 42A, a heating unit 50A, a sensor 60A, and a switch 61A. Note that the bowl 11, the first opening 12, the drain pipe 13, the trap 14, the second opening 15, and the overflow pipe 16 of the drainage device 10A have the same configurations as those in the first embodiment, and thus the description thereof is omitted.

[0046] As shown in FIG. 5, the needle 42A has a sharp shape. The tip of the needle 42A faces the drain pipe 13. The needle 42A is made of a metal with high thermal conductivity such as aluminum or copper. The heating unit 50A is located on the base end side of the needle 42A. The heating unit 50A is connected to the needle 42A. The heating unit 50A is connected to a power source by a first cord 51A and a second cord 52A. The heating unit 50A generates heat when power is supplied from a power source (not shown).

[0047] The main body 30A of the cover 17A has a first main body 53A located on the second opening 15 side and a second main body 54A located on the opposite side thereof. The second main body 54A is detachable from the first main body 53A. One end of the first cord 51A is connected to the switch 61A, and the other end is connected to the first main body 53A. One end of the second cord 52A is connected to the second main body 54A, and the other end is a plug (not shown). The first cord 51A and the second cord 52A are connected or disconnected when the first main body 53A and the second main body 54A are detached.

[0048] The portion of the sensor 60A that detects bubbles is located between the tip of the needle 42A and the heating unit 50A. The sensor 60A can output an electrical signal in response to detecting bubbles flowing backward through the first flow path 23. The sensor 60A may be any device that can detect the backward flow of bubbles. For example, a capacitance-type sensor that detects contact of bubbles with the sensor 60A based on changes in resistance value and capacitance is used.

[0049] Switch 61A switches the energization state to the heat generating part 50A. The switch 61A is a transistor switch such as a MOS-FET (Metal Oxide Semiconductor - Field Effect Transistor), for example. The switch 61A is located at a position closer to the second opening 15 than the heat generating part 50A. The switch 61A is connected to the power source and the heat generating part 50A. Also, the switch 61A is electrically connected to the sensor 60A and can receive an electrical signal from the sensor 60A. When the switch 61A receives an electrical signal from the sensor 60A, it turns on the energization from the power source to the heat generating part 50A, and when it does not receive an electrical signal from the sensor 60A, it turns off the energization from the power source to the heat generating part 50A.

[0050] When a bubble is detected by the sensor 60A, the switch 61A that has received the electrical signal from the sensor 60A turns on the energization to the heat generating part 50A. Then, the needle 42A is heated by the heat generating part 50A. The needle 42A is preferably heated to, for example, 60 to 90°C. When the heated needle 42A contacts the bubble, the film of the bubble is broken by the needle 42A, or the air inside the bubble is heated by the needle 42A and the bubble expands. As a result, the film thickness of the bubble becomes thinner and the bubble is broken.

[0051] [Operation and Effect of the Second Embodiment] According to the drainage device 10A described above, when the needle 42A heated by the heat generating part 50A contacts the bubble, the bubble is broken.

[0052] Also, when the sensor 60A detects a bubble, the switch 61A switches to energize the heat generating part 50A. By energizing only when the bubble flows backward in the overflow pipe 16, it is possible to suppress the outflow of the bubble from the second opening 15 to the bowl 11 while suppressing power consumption.

[0053] In the second embodiment, the case where a capacitance type sensor is used for the sensor 60A has been described as an example, but the configuration is not limited to this. The sensor 60A may be another type of sensor that can detect the backward flow of the bubble.

[0054] Also, in the second embodiment, the case where the switch 61A is a transistor switch has been described as an example, but the configuration is not limited to this. The switch 61A may be controlled by, for example, a computer terminal or the like.

[0055] Also, in the second embodiment, the case where the sensor 60A senses the backflow of bubbles, switches the switch 61A, breaks the bubbles at the defoaming unit 18B, and suppresses the backflow of bubbles has been described as an example, but the configuration is not limited to this. The defoaming unit 18B may include a heating unit 50A that is always energized.

[0056] [Third Embodiment] In the drainage device 10 according to the above-described first embodiment and the drainage device 10A according to the second embodiment, it is necessary to directly contact the defoaming unit 18 with the bubbles in order to break the bubbles, but the configuration is not limited to this. The drainage device 10B may be configured such that the defoaming unit 18 breaks the bubbles by blowing air.

[0057] As shown in FIG. 6, the defoaming unit 18B of the drainage device 10B according to the third embodiment includes a needle 42B, a main body case 69B, a fan 70B, a heater 71B, a sensor 60B, and a switch 61B. Note that, similar to the second embodiment, the bowl 11, the first opening 12, the drain pipe 13, the trap 14, the second opening 15, and the overflow pipe 16 have the same configuration as in the second embodiment, and thus the description thereof is omitted.

[0058] The needle 42B is made of a metal such as aluminum or copper. The needle 42B has a hollow shape and has a flow path 72B along the central axis. The tip of the needle 42B is open toward the drain pipe 13. The base end side of the needle 42B is open toward the heater 71B.

[0059] The main body case 69B is located on the proximal end side of the needle 42B. The main body case 69B has a housing space 73B that houses the fan 70B and the heater 71B. The housing space 73B communicates with the flow path 72B. The housing space 73B opens toward the second opening 15. The heater 71B is connected to a power source by a cord 51B. The heater 71B generates heat when energized and heats the surrounding air.

[0060] The fan 70B blows air from the needle 42B toward the drain pipe 13. The fan 70B is located on the second opening 15 side of the heater 71B. The fan 70B is connected to a power source by a cord 51B. When the fan 70B is driven, the air heated by the heater 71B passes through the flow path 72B and is blown toward the drain pipe 13. The cord 51B extends from the heater 71B and the fan 70B to the main body 30B of the cover 17B and further extends from the main body 30B.

[0061] The sensor 60B is located between the tip of the needle 42B and the heater 71B where the part for detecting bubbles is located. Similar to the second embodiment, the sensor 60B can output an electrical signal in response to detecting bubbles flowing backward through the first flow path 23.

[0062] The switch 61B switches the energization state of the heater 71B and the fan 70B. The switch 61B is, for example, a transistor switch. The switch 61A is located on the second opening 15 side of the fan 70B. The switch 61B is connected to a power source. Also, the switch 61B is connected to the heater 71B and the fan 70B. Further, the switch 61B is electrically connected to the sensor 60B and can receive an electrical signal from the sensor 60B. When the switch 61B receives an electrical signal from the sensor 60B, it turns on the power supply to the heater 71B and the fan 70B, and when it does not receive an electrical signal from the sensor 60A, it turns off the power supply to the heater 71B and the fan 70B.

[0063] When the bubble is detected by the sensor 60B, the switch 61B that has received the electrical signal from the sensor 60B turns on the power supply to the fan 70B and the heater 71B. Then, warm air is blown from the tip of the needle 42A. When warm air is blown onto the bubble, the bubble is destroyed by the warm air, or the air inside the bubble is heated by the warm air and the bubble expands. As a result, the film thickness of the bubble becomes thinner and the bubble is destroyed.

[0064] [Operation and Effect of the Third Embodiment] According to the drainage device 10B described above, the fan 70B blows air from the tip of the defoaming part 18B onto the bubble. Thereby, the bubble is destroyed. For this reason, the outflow of bubbles from the second opening 15 to the bowl 11 is suppressed.

[0065] Further, when the sensor 60B detects a bubble, the switch 61B switches and the fan 70B is energized. The fan 70B can be energized only when there are bubbles in the overflow pipe 16, and the outflow of bubbles from the second opening 15 to the bowl 11 can be suppressed while suppressing power consumption.

[0066] In addition, in the third embodiment, the case where the defoaming part 18B has the fan 70B and the heater 71B has been described as an example, but the present invention is not limited to this configuration. The main body part 41B may have only the fan 70B. The bubble flowing back through the overflow pipe 16 may be broken by the air blown from the needle 42B.

[0067] In addition, in the third embodiment, the case where the switch 61B energizes the fan 70B and the heater 71B to break the bubble when the sensor 60B senses the bubble has been described as an example, but the present invention is not limited to this configuration. The fan 70B and the heater 71B may be energized constantly. Further, the fan 70B may be constantly energized and only the heater 71B may be driven in response to the backflow of the bubble.

[0068] [Appendix 1] A bowl, A first opening located at the bottom of the above bowl, In the above bowl, a second opening located at a position higher than the first opening, a drain pipe extending downward from the first opening, a trap located below the drain pipe and curved in an S shape, an overflow pipe connecting the drain pipe and the second opening, and an antifoaming part located in the overflow pipe for eliminating bubbles, a drainage device.

[0069] [Appendix 2] Further comprising a cover, the cover has a main body, legs extending from the main body, and a third opening, the legs are engageable with the second opening, the antifoaming part is connected to the cover, the drainage device according to Appendix 1.

[0070] [Appendix 3] the antifoaming part is a needle with a tip facing the drain pipe, the drainage device according to Appendix 1 or 2. As described in Appendix 1.

[0071] [Appendix 4] the antifoaming part is a resistor that generates heat when energized, the drainage device according to Appendix 1 or 2.

[0072] [Appendix 5] the resistor is a needle with a tip facing the drain pipe, the drainage device according to Appendix 4.

[0073] [Appendix 6] a sensor for detecting bubbles located in the overflow pipe, and a switch for switching the energization state of the resistor based on a signal output by the sensor, the drainage device according to Appendix 4.

[0074] [Appendix 7] Further comprising a fan, the antifoaming part has a flow path with an opening facing the drain pipe, The above-mentioned fan is the drainage device described in Appendix 1 or 2 that blows air into the above-mentioned flow path.

[0075] [Appendix 8] The drainage device according to claim 7, further comprising a heater that heats the air blown by the above-mentioned fan.

[0076] [Appendix 9] A sensor that is located on the above-mentioned overflow pipe and detects bubbles, and A switch that switches the energization state of the above-mentioned fan based on the signal output by the above-mentioned sensor. The drainage device according to claim 8 further includes these components.

Explanation of Reference Signs

[0077] 10, 10A, 10B ··· Drainage device 11 ··· Bowl 12 ··· First opening 13 ··· Drain pipe 14 ··· Trap 15 ··· Second opening 16 ··· Overflow pipe 17, 17A, 17B ··· Cover 18, 18A, 18B ··· Defoaming part 30, 30A, 30B ··· Main body 31 ··· Legs 36 ··· Third opening 42, 42A, 42B ··· Needle 60A, 60B ··· Sensor 61A, 61B ··· Switch 70B ··· Fan 71B ··· Heater 72B ··· Flow path

Claims

1. A bowl, a first opening located at the bottom of the bowl, a second opening located at a position higher than the first opening in the bowl, a drain pipe extending downward from the first opening, a trap located below the drain pipe and curved in an S shape, an overflow pipe connecting the drain pipe and the second opening, an antifoaming part located in the overflow pipe for eliminating bubbles, and a cover, and the cover has a main body, legs extending from the main body, and a third opening, the legs are engageable with the second opening, the antifoaming part is a drainage device connected to the cover.

2. The drainage device according to claim 1, wherein the antifoaming part is a needle with a tip facing the drain pipe.

3. A bowl, a first opening located at the bottom of the bowl, a second opening located at a position higher than the first opening in the bowl, a drain pipe extending downward from the first opening, a trap located below the drain pipe and curved in an S shape, an overflow pipe connecting the drain pipe and the second opening, and an antifoaming part located in the overflow pipe for eliminating bubbles, and the antifoaming part is a resistor that generates heat when energized, which is a drainage device.

4. The drainage device according to claim 3, wherein the resistor is a needle with a tip facing the drain pipe.

5. The drainage device according to claim 3, further comprising a sensor located in the overflow pipe for detecting bubbles, and a switch for switching the energization state of the resistor based on a signal output by the sensor.

6. A bowl, a first opening located at the bottom of the bowl, a second opening located at a position higher than the first opening in the bowl, a drain pipe extending downward from the first opening, a trap located below the drain pipe and curved in an S shape, an overflow pipe connecting the drain pipe and the second opening, an antifoaming part located in the overflow pipe for eliminating bubbles, and a fan, and the antifoaming part has a flow path with an opening facing the drain pipe, the fan is a drainage device that blows air into the flow path.

7. The drainage device according to claim 6, further comprising a heater for heating the air blown by the fan.

8. The drainage device according to claim 7, further comprising a sensor located in the overflow pipe for detecting bubbles, and a switch for switching the energization state of the fan based on a signal output by the sensor.

9. further comprising a cover, the cover having a main body, legs extending from the main body, and a third opening, the legs being engageable with the second opening, The drainage device according to any one of claims 3 to 8, wherein the defoaming portion is connected to the cover.

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