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 with an overflow. [Background technology]

[0002] The drainage device of Patent Document 1 includes a bowl portion, a drain outlet flow path extending downward from the drain outlet, and an overflow flow path. The bowl portion has a first wall on the rear side, a second wall on the front side, a third wall provided to the side of the first wall, and a fourth wall on the opposite side 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 outlet flow path below the drain outlet. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2021-25203 Summary of the Invention [Problem to be solved by the invention]

[0004] The drain outlet passage of the drainage device is sealed with water to prevent the intrusion of bad odors or insects. If a foaming detergent or the like accumulates in the drain outlet passage, a large amount of foam may be generated by the inflow of water. The generated foam may flow back up the overflow passage and flow out into the bowl section.

[0005] The present invention has been made in consideration of the above-mentioned circumstances, and its object is to provide a drainage device that can prevent foam from flowing out from the overflow pipe into the bowl. [Means for solving the problem]

[0006] (1) A drainage device according to claim 1 includes a bowl, a first opening located at the bottom of the bowl, a second opening located in the bowl at a higher position than the first opening, a drain pipe extending downward from the first opening, and a trap located below the drain pipe and curved in an S-shape; The device includes an overflow pipe that connects the drain pipe and the second opening, and a defoaming unit that is located in the overflow pipe and that eliminates foam.

[0007] The defoaming section eliminates foam that enters the overflow pipe from the drain pipe, thereby preventing foam from flowing out from the second opening into the bowl.

[0008] (2) Claim 2 relates to a drainage device as described in claim 1, further comprising a cover, the cover having a main body, a leg extending from the main body, and a third opening, the leg being engageable with the second opening, and the defoaming section being connected to the cover.

[0009] By engaging the legs of the cover with the second opening, the defoaming unit is positioned in the overflow pipe. Water collected in the bowl flows out into the overflow pipe through the third opening. When the legs of the cover are removed from the second opening, the defoaming unit is removed from the overflow pipe together with the cover. This makes it easy to perform maintenance on the defoaming unit.

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

[0011] The needle-shaped tip comes into contact with the bubbles, causing them to break.

[0012] (4) Claim 4 provides the drainage device according to claim 1 or 2, wherein the defoaming section is a resistor that generates heat when electricity is passed through it.

[0013] When the bubbles are heated, the gas inside the bubbles expands and causes the bubbles to collapse.

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

[0015] The needle-shaped tip comes into contact with the bubbles, causing them to break.

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

[0017] When the sensor detects foam, a switch is activated to energize the resistor. When foam is present in the overflow pipe, electricity is applied to the resistor, reducing power consumption while preventing foam from leaking out of the second opening into the bowl.

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

[0019] When the air from the fan is blown onto the foam through the opening in the defoaming section, the foam film is broken, preventing the foam from flowing out of the second opening into the bowl.

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

[0021] By blowing hot air onto the foam, the foam film is more likely to break down, which more reliably prevents the foam from leaking out of the second opening into the bowl.

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

[0023] When the sensor detects foam, a switch is switched on to energize the fan. Since the fan is energized when there is foam in the overflow pipe, it is possible to reduce power consumption while also preventing foam from escaping from the second opening into the bowl. Effect of the Invention

[0024] According to the present invention, it is possible to prevent foam from flowing out from the overflow pipe into the bowl. [Brief description of the drawings]

[0025] [Figure 1] FIG. 1 is a schematic diagram showing an example of a drainage device 10 according to a first embodiment. [Diagram 2] Fig. 2(a) is a cross-sectional view showing the cover 17 engaged with the second opening 15. Fig. 2(b) is a view showing the cover 17 as viewed from the front. [Diagram 3] FIG. 3 is an enlarged view of the defoaming portion 18 of FIG. [Figure 4] FIG. 4 is a schematic diagram showing an example of a drainage device 10A according to the second embodiment. [Diagram 5] FIG. 5 is an enlarged view of the defoaming section 18A in FIG. [Figure 6] FIG. 6 is a diagram showing a defoaming section 18B of a drainage device 10B according to the third embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0026] Hereinafter, a drainage device 10 according to an embodiment of the present invention will be described with reference to the drawings. Note that the embodiment described below is merely one example of the present invention, and it goes without saying that the embodiment of the present invention can be appropriately modified without departing from the gist of the present invention.

[0027] In the following description, when 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 toward the washbasin 1 is referred to as the forward direction, and the opposite direction is referred to as the rearward direction. The forward and rearward directions together are referred to as the front-rear direction 8. The direction perpendicular to the up-down direction 7 and the front-rear direction 8 is referred to as the left-right direction 9.

[0028] [First embodiment] The drainage device 10 is provided in a washbasin 1 installed in a washroom or the like of a house. The drainage device 10 is a device for discharging liquid in a 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 a defoaming section 18.

[0029] Bowl 11 is located below the faucet and is capable of storing liquid. As shown in FIG. 1, bowl 11 is a concave vessel that opens upward. Bowl 11 has a predetermined depth. First opening 12 is an opening through which liquid supplied to or stored in bowl 11 is discharged. First opening 12 is located at the bottom of bowl 11. The first opening is circular when viewed from the top-bottom direction 7.

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

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

[0032] Second opening 15 is an opening located below the edge of bowl 11 so that liquid does not overflow from bowl 11. Second opening 15 is located above first opening 12. Second opening 15 is circular when viewed from the front-rear direction 8. When liquid is supplied to bowl 11 with first opening 12 plugged, the liquid can be stored up to the height of 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 is in communication 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 is in communication 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 foam is generated in the trap 14, the foam flows back from the drain pipe 13 to 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 located 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 circumferential surface 34.

[0035] The first surface 32 is a surface of the main body 30 facing forward. The first surface 32 is circular when viewed from the front. The outer diameter of the first surface 32 is larger than the second opening 15. The second surface 33 is a surface of the main body 30 facing rearward. 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-to-rear direction 8.

[0036] The legs 31 are engageable with the second opening 15. As shown in FIGS. 2(a) and (b), the legs 31 are rod-shaped and extend forward from the first surface 32. Three legs 31 are arranged on the first surface 32. Each of the legs 31 is located a certain distance away from the center C radially outward on the first surface 32. Each of the legs 31 is located at a certain angle around the center C on the first surface 32. When the legs 31 are engaged with the second opening 15, the legs 31 abut against an inner circumferential surface 35 of the second opening 15.

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

[0038] The third opening 36 is formed when the leg 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 is in communication with the second opening 15. In other words, the first surface 32 of the main body 30 of the cover 17 does not seal the second opening 15. Therefore, when the leg 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 unit 18 comes into contact with the foam to eliminate it. As shown in FIG. 3, the defoaming unit 18 is located inside the overflow pipe 16 when the cover 17 is located at the second opening 15. The defoaming unit 18 is connected to the cover 17 by a connecting part 40. A stainless steel ball chain is used for the connecting part 40, for example. The defoaming unit 18 is detached from the overflow pipe 16 when the cover 17 is detached from the second opening 15, and is located inside the overflow pipe 16 when the cover is located at the second opening 15. The defoaming unit 18 has a main body part 41 and a needle 42.

[0040] The main body 41 is connected to the connecting part 40 and is located in the first flow path 23. The main body 41 is made of a metal such as stainless steel or iron. A plurality of needles 42 are connected to the main body 41. The needles 42 are made of synthetic resin and are flexible. The tip portions of the needles 42 extend along the first flow path 23. The tips of the needles 42 face toward the drain pipe 13 so as to come into contact with the foam flowing backward through the overflow pipe 16.

[0041] The position of the defoaming section 18 in the overflow pipe 16 is not particularly limited, but it is preferable that it is close to the drain pipe 13, because this allows bubbles entering the overflow pipe 16 from the drain pipe 13 to be defoamed near the drain pipe 13. The length of the main body 41 and the number of needles 42 of the defoaming section 18 are also not particularly limited, but the longer the main body 41 and the more needles 42 there are, the greater the defoaming effect, which is preferable.

[0042] [Effects of the first embodiment] According to the drainage device 10 described above, foam generated in the trap 14 and entering the overflow pipe 16 from the drain pipe 13 comes into contact with the tip of the needle 42 of the defoaming section 18, and the film forming the foam is destroyed. By destroying the foam in the overflow pipe 16, the foam is prevented from flowing out from the second opening 15 into the bowl 11.

[0043] Furthermore, when cover 17 is positioned at second opening 15, defoaming section 18 connected to cover 17 is positioned within overflow pipe 16. At this time, liquid accumulated in bowl 11 can flow into overflow pipe 16 through third opening 19. On the other hand, when cover 17 is removed from second opening 15, defoaming section 18 is taken out from overflow pipe 16 together with cover 17. This makes it easy to perform maintenance of defoaming section 18.

[0044] [Second embodiment] In the drainage device 10 according to the first embodiment described above, the needle 42 of the defoaming unit 18 breaks the foam film, but the present invention is not limited to this configuration. In the drainage device 10A, the defoaming unit 18A may be a resistor that generates heat when electricity is applied.

[0045] 4 and 5, the defoaming section 18A of the drainage device 10A according to the second embodiment has a needle 42A, a heat generating section 50A, a sensor 60A, and a switch 61 A. Note that the bowl 11, first opening 12, drain pipe 13, trap 14, second opening 15, and overflow pipe 16 of the drainage device 10A have the same configurations as those of the first embodiment, and therefore their explanations are omitted.

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

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

[0048] The portion of the sensor 60A that detects bubbles is located between the tip of the needle 42A and the heat generating portion 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 sensor capable of detecting the backward flow of bubbles, and for example, a capacitance sensor that detects contact of bubbles with the sensor 60A by changes in resistance and capacitance is used.

[0049] The switch 61A switches the energization state of the heat generating unit 50A. The switch 61A is a transistor switch such as a MOS-FET (Metal Oxide Semiconductor-Field Effect Transistor). The switch 61A is located closer to the second opening 15 than the heat generating unit 50A. The switch 61A is connected to the power source and the heat generating unit 50A. The switch 61A is also 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 unit 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 unit 50A.

[0050] When the sensor 60A detects bubbles, the switch 61A receives an electrical signal from the sensor 60A and turns on the power supply to the heating unit 50A. Then, the needle 42A is heated by the heating unit 50A. The needle 42A is preferably heated to, for example, 60 to 90°C. When the heated needle 42A comes into contact with the bubbles, the bubble film is destroyed by the needle 42A, or the air inside the bubbles is heated by the needle 42A, causing the bubbles to expand. As a result, the bubble film thickness becomes thinner and the bubbles are destroyed.

[0051] [Effects of the second embodiment] According to the drainage device 10A described above, the needle 42A heated by the heating unit 50A comes into contact with the foam, thereby destroying the foam.

[0052] Furthermore, when sensor 60A detects foam, switch 61A switches so as to energize heating element 50A. By energizing overflow pipe 16 only when foam flows backward, it is possible to suppress foam from flowing out of second opening 15 into bowl 11 while suppressing power consumption.

[0053] In the second embodiment, the sensor 60A is a capacitance sensor, but the present invention is not limited to this configuration. The sensor 60A may be another type of sensor that can detect the backflow of bubbles.

[0054] In the second embodiment, the switch 61A is a transistor switch, but the present invention is not limited to this configuration. The switch 61A may be controlled by, for example, a computer terminal.

[0055] In the second embodiment, the sensor 60A detects the backflow of foam and switches the switch 61A to break the foam with the defoaming unit 18B, thereby suppressing the backflow of foam. However, the present invention is not limited to this configuration. 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 first embodiment and the drainage device 10A according to the second embodiment described above, the defoaming unit 18 needs to be brought into direct contact with the foam to break up the foam, but this is not the only possible configuration. The drainage device 10B may be one in which the defoaming unit 18 breaks up the foam by blowing air.

[0057] 6, the defoaming section 18B of the drainage device 10B according to the third embodiment has a needle 42B, a main body case 69B, a fan 70B, a heater 71B, a sensor 60B, and a switch 61B. As in 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 therefore the description thereof will be omitted.

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

[0059] The main body case 69B is located on the base end side of the needle 42B. The main body case 69B has an accommodation space 73B that accommodates a fan 70B and a heater 71B. The accommodation space 73B is in communication with a flow path 72B. The accommodation space 73B opens toward the second opening 15. The heater 71B is connected to a power source by a cord 51B. When energized, the heater 71B generates heat 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 closer to the second opening 15 than the heater 71B. The fan 70B is connected to a power source by a cord 51B. When the fan 70B is driven, air heated by the heater 71B passes through a 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 has a portion for detecting bubbles located between the tip of the needle 42B and the heater 71B. The sensor 60B is capable of outputting an electrical signal in response to detection of bubbles flowing backward through the first flow path 23, similar to the second embodiment.

[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 closer to the second opening 15 than the fan 70B. The switch 61B is connected to a power source. The switch 61B is also connected to the heater 71B and the fan 70B. The switch 61B is further electrically connected to the sensor 60B and can receive an electrical signal from the sensor 60B. The switch 61B turns on the energization of the heater 71B and the fan 70B when it receives an electrical signal from the sensor 60B, and turns off the energization of the heater 71B and the fan 70B when it does not receive an electrical signal from the sensor 60A.

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

[0064] [Effects of the third embodiment] According to the drainage device 10B described above, the fan 70B blows air from the tip of the defoaming section 18B onto the foam. This breaks up the foam. This prevents the foam from flowing out of the second opening 15 into the bowl 11.

[0065] Furthermore, when sensor 60B detects foam, switch 61B is switched to energize fan 70B. Fan 70B can be energized only when there is foam in overflow pipe 16, making it possible to suppress the outflow of foam from second opening 15 into bowl 11 while suppressing power consumption.

[0066] In the third embodiment, the defoaming section 18B has the fan 70B and the heater 71B, but the present invention is not limited to this configuration. The main body 41B may have only the fan 70B. Bubbles flowing backward through the overflow pipe 16 may be broken by air blown from the needle 42B.

[0067] In the third embodiment, when the sensor 60B detects bubbles, the switch 61B energizes the fan 70B and the heater 71B to break the bubbles, but the present invention is not limited to this configuration. The fan 70B and the heater 71B may be energized at all times. Alternatively, the fan 70B may be energized at all times, and only the heater 71B may be driven in response to the backflow of bubbles.

[0068] [Appendix 1] A bowl and a first opening located at a bottom of the bowl; a second opening in the bowl located at a higher position 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; A drainage device comprising a defoaming section located in the overflow pipe for eliminating foam.

[0069] [Appendix 2] A cover is further provided, The cover has a body, a leg extending from the body, and a third opening, The leg is engageable with the second opening; The drainage device according to claim 1, wherein the defoaming unit is connected to the cover.

[0070] [Appendix 3] 3. The drainage device according to claim 1 or 2, wherein the defoaming section is a needle whose tip faces the drainage pipe. As described in Appendix 1.

[0071] [Appendix 4] 3. The drainage device according to claim 1 or 2, wherein the defoaming section is a resistor that generates heat when electricity is applied thereto.

[0072] [Appendix 5] 5. The drainage device of claim 4, wherein the resistor is a needle with a tip facing the drain pipe.

[0073] [Appendix 6] a sensor located in the overflow pipe for detecting bubbles; 5. The drainage device according to claim 4, further comprising a switch that switches a current-carrying state of the resistor based on a signal output by the sensor.

[0074] [Appendix 7] It also has a fan, The defoaming section has a flow path with an opening facing the drain pipe, 3. The drainage device according to claim 1, wherein the fan blows air into the flow path.

[0075] [Appendix 8] 8. The drainage device according to claim 7, further comprising a heater for heating the air blown by the fan.

[0076] [Appendix 9] a sensor located in the overflow pipe for detecting bubbles; 9. The drainage device according to claim 8, further comprising a switch that switches a power supply state to the fan based on a signal output by the sensor. [Explanation of symbols]

[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 unit 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 and a first opening located at a bottom of the bowl; a second opening in the bowl located at a higher position 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; A drainage device comprising a defoaming section located in the overflow pipe for eliminating foam.

2. A cover is further provided, The cover has a main body, a leg extending from the main body, and a third opening, The leg is engageable with the second opening; The drainage device according to claim 1 , wherein the defoaming section is connected to the cover.

3. 3. The drainage device according to claim 1, wherein the defoaming portion is a needle having a tip pointing toward the drain pipe.

4. 3. The drainage device according to claim 1, wherein the defoaming section is a resistor that generates heat when electricity is applied thereto.

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

6. a sensor located in the overflow pipe for detecting bubbles; 5. The drainage device according to claim 4, further comprising a switch that switches a state of electrical current passing through the resistor based on a signal output from the sensor.

7. It also has a fan, The defoaming section has a flow path with an opening facing the drain pipe, The drainage device according to claim 1 or 2, wherein the fan blows air into the flow path.

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

9. a sensor located in the overflow pipe for detecting bubbles; 9. The drainage device according to claim 8, further comprising a switch that switches a power supply state to the fan based on a signal output from the sensor.

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