EP3101185A1 - Sanitary washing apparatus - Google Patents
Sanitary washing apparatus Download PDFInfo
- Publication number
- EP3101185A1 EP3101185A1 EP16172920.7A EP16172920A EP3101185A1 EP 3101185 A1 EP3101185 A1 EP 3101185A1 EP 16172920 A EP16172920 A EP 16172920A EP 3101185 A1 EP3101185 A1 EP 3101185A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- water
- tank
- disposed
- port
- prevention mechanism
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
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Classifications
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03D—WATER-CLOSETS OR URINALS WITH FLUSHING DEVICES; FLUSHING VALVES THEREFOR
- E03D9/00—Sanitary or other accessories for lavatories ; Devices for cleaning or disinfecting the toilet room or the toilet bowl; Devices for eliminating smells
- E03D9/08—Devices in the bowl producing upwardly-directed sprays; Modifications of the bowl for use with such devices ; Bidets; Combinations of bowls with urinals or bidets; Hot-air or other devices mounted in or on the bowl, urinal or bidet for cleaning or disinfecting
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03C—DOMESTIC PLUMBING INSTALLATIONS FOR FRESH WATER OR WASTE WATER; SINKS
- E03C1/00—Domestic plumbing installations for fresh water or waste water; Sinks
- E03C1/02—Plumbing installations for fresh water
- E03C1/10—Devices for preventing contamination of drinking-water pipes, e.g. means for aerating self-closing flushing valves
- E03C1/102—Devices for preventing contamination of drinking-water pipes, e.g. means for aerating self-closing flushing valves using an air gap device
Definitions
- a sanitary washing apparatus includes a nozzle, a water passage, a tank, and a backflow prevention mechanism.
- the nozzle is configured to discharge water toward a private part of a user.
- the water passage is configured to communicate with the nozzle and a water supply pipe.
- the tank is disposed on the water passage.
- the tank is provided with a heating element inside thereof and configured to store water therein.
- the tank is configured to supply water to the nozzle.
- the backflow prevention mechanism is disposed on the water passage and upstream of the tank.
- the water passage includes a first water passage that connects the water supply pipe and the backflow prevention mechanism, and a second water passage that connects the tank and the nozzle.
- a sanitary washing apparatus includes a tank, a discharge nozzle, and a backflow prevention mechanism.
- the tank is provided with a heating element inside thereof and stores water therein.
- the discharge nozzle discharges water in the tank toward a private part of a user.
- the backflow prevention mechanism has an air gap disposed on an upstream side of the tank and at a site where a flow passage is divided by an atmosphere open space.
- the backflow prevention mechanism includes a spout port, a water-receiving port, and a water drain port.
- the spout port is disposed at an end of a flow passage communicating with a water supply pipe and spouts water in a horizontal direction.
- such a backflow prevention mechanism is a horizontal-type backflow prevention mechanism and a water-receiving port of the backflow prevention mechanism serves as an inflow port of a tank, so that a sanitary washing apparatus can be downsized.
- the water drain port and the water drain channel are formed to have shapes provided by denting the outer wall toward an inside of the tank. Thereby, a water drain channel is not required to be installed as a separate member in a heat exchanged that includes a backflow prevention mechanism, so that the number of parts can be reduced and a tank can be downsized.
- the sanitary washing apparatus includes a pump that is disposed on a downstream side of the tank and supplies water stored in the tank to the discharge nozzle.
- the case houses the pump on a side of a distal end of a slope part where a top surface is downwardly sloped toward a side of a bowl of a toilet in a side view. Thereby, a dead space of a case can be utilized effectively.
- the tank includes a direction-changing part that causes water spouted from the spout port and passing though the water-receiving port to change a direction of its flow downwardly. Thereby, water received through a water-receiving port can efficiently be guided to a tank.
- an open-type tank is separately disposed on an upstream side of a tank of a heat exchanger and such an open-type tank is provided with a vertical-type backflow prevention mechanism that spouts water in a vertical direction.
- Water stored in such an open-type tank is pumped to such a tank of a heat exchanger by a pump disposed on a downstream side of the open-type tank and subsequently supplied to a nozzle unit.
- the thermistor 73 detects temperature of water in the tank 80 and outputs a signal that indicates detected temperature.
- the bimetal 74 is interposed in an energization circuit (not-illustrated) for the heating element 71.
- the bimetal 74 opens a contact in an energization circuit in a case where temperature of water in the tank 80 is higher than a predetermined level, so that energization of the heating element 71 is blocked.
- a predetermined temperature can be set arbitrary, and it is preferable to set, for example, a value enabling to detect an excessive temperature rise of water in the tank.
- the pump 130 is disposed on a downstream side of the tank 80 and the strainer 110.
- the pump 130 is driven in response to a control signal from the control part 200 and supplies water stored in the tank 80 to the discharge nozzle 41.
- the seating sensor 210 is disposed at, for example, an appropriate position of the case 31 (see FIG. 1 ) and detects that a user sits on a toilet seat.
- the seating sensor 210 outputs a predetermined signal that indicates seating in a case where the seating is detected.
- a light-projecting-and-receiving-type distance sensor can be used for the seating sensor 210.
- FIG. 3 is a perspective view of the sanitary washing apparatus 20. Any view in FIG. 3 and subsequent figures that illustrate a configuration of the sanitary washing apparatus 20 is a schematic diagram.
- the case cover 31 b is configured to be attachable to and detachable from the plate 31 a and mounted so as to cover tops of various components disposed on the plate 31 a.
- the case cover 31 b is indicated by an imaginary line so that an inside of the case 31 is indicated transparently.
- the backflow prevention mechanism 90 is disposed on top of the tank 80.
- the backflow prevention mechanism 90 is disposed on an upper right portion of the tank 80, in other words, on a side of the discharge nozzle 41 on top of the tank 80.
- the backflow prevention mechanism 90 is disposed on top of the tank 80 and not limited thereto, and the backflow prevention mechanism 90 may be disposed at, for example, an upper position that separates from the tank 80 by a predetermined distance.
- water spouted from the spout port 91 is indicated by an arrow of broken line D1.
- a term of "horizontal”, “vertical”, or the like does not necessarily need mathematically strict precision and a substantial tolerance or error or the like is permitted.
- the second seal member 116b is mounted on the sealing part 113a of the cap 113.
- the second seal member 116b seals a gap between the sealing part 113a and the water drain hole 83 in a watertight manner when the strainer 110 is disposed at a position where the water drain hole 83 is sealed thereby.
- the cover 120 configured as mentioned above is installed in the water drain hole 83 so that one end 120d of the cover 120 is communicated with the water drain hole 83.
- a female screw 83b capable of engaging with the male screw 112a is formed on the water drain hole 83 of the tank 80. Therefore, the male screw 112a is engaged with the female screw 83b, so that the strainer 110 is installed in the water drain hole 83. The male screw 112a is loosened with respect to the female screw 83b, so that the strainer 110 is removed from the water drain hole 83.
- the strainer 110 is provided so as to be attachable to and detachable from the water drain hole 83, and hence, the strainer 110 is removed from the water drain hole 83, so that scale in the tank 80 can reliably be discharged.
- water supplied from the tank 80 passes through the outflow port 82b and the filter 114 as indicated by an arrow D9, and as water passes through the filter 114, scale included therein is captured. Water having passed through the filter 114 flows on the second flow passage 100, and subsequently, is discharged from the discharge nozzle 41 through the pump 130.
- the case 31 is provided with the above-mentioned taking-out hole 34 (see FIG. 3 ), and hence, the strainer 110 is taken out through the taking-out hole 34.
- the case 31 is provided with the taking-out hole 34, so that the strainer 110 can be removed from the tank 80 without removing the case cover 31 b or the like.
- the slope part 37 is positioned so as to cover a front side of the plate 31 a (a negative direction of a Y-axis).
- the slope part 37 is formed in such a manner that an upper surface 37a thereof is continuous with the rectangular part 36.
- the upper surface 37a of the slope part 37 is continuous with the front surface 36a of the rectangular part 36 on a side of a proximal end 37a1 thereof, and is sloped forward and downward so as to be directed downward on a side of a distal end 37a2 thereof.
- the slope part 37 configured as mentioned above is provided in such a manner that an internal space 39 with a trapezoidal shape or a substantially trapezoidal shape is formed in a side view.
- the internal space 39 is comparative narrow and has a deformed shape, and hence, is frequently a dead space.
- the above-mentioned pump 130 is contained on a side of the distal end 37a2 of the slope part 37 in the sanitary washing apparatus 20 according to the present embodiment. Thereby, a dead space of the case 31 can be utilized effectively.
- the heating element control unit 203 operates the heating element 71 to heat water in the tank 80 in a case where temperature of water in the tank 80 that is detected by the state detection unit 201 is lower than a reference temperature. On the other hand, the heating element control unit 203 stops an operation of the heating element 71 in a case where temperature of water in the tank 80 is higher than or equal to such a reference temperature.
- the state detection unit 201 detects an ON signal from the seating sensor 210. Then, as an instruction for starting washing is input by a user through the operation part 220 at a time T2, the water supply control part 202 drives the pump 130 to discharge water (hot water) in the tank 80 from the discharge nozzle 41.
- hot water in the tank 80 is provided with a reference symbol HW and indicated by dots
- cold water is provided with a reference symbol CW and indicated by diagonal lines.
- hot water HW means water heated by the heating element 71 to have temperature around reference temperature
- cold water CW means water at temperature that has not yet reached such reference temperature, for example, immediately after water flows into the tank 80 through the water inflow pipe 81.
- the water supply control unit 202 stops the pump 130 to stop discharge of water from the discharge nozzle 41.
- the water supply control unit 202 also closes the electromagnetic valve 62 to stop supply of water into the tank 80 (see FIG. 15E ).
- a float switch ON time is longer than a third predetermined time A3 at a time T12
- the water supply control unit 202 closes the electromagnetic valve 62 to stop supply of water into the tank 80.
- a third predetermined time A3 is settable at an arbitrary value, and is set at, for example, a value of a few seconds to several tens of seconds.
- the outlet 81 b of the water inflow pipe 81 is positioned closer to the heating element 71.
- the water inflow pipe 81 is provided in such a manner that the outlet 81 b is disposed above the center line 71 a of the heating element 71, and is not limited thereto.
- the backflow prevention mechanism 90 includes the spout port 91, the water-receiving port 92, and the water drain port 93.
- the spout port 91 is disposed at the end 60a of the first flow passage 60 communicating with the water supply pipe A and spouts water in a horizontal direction.
- the water-receiving port 92 is disposed to be opposed to the spout port 91 through the atmosphere open space 94, receives water spouted from the spout port 91, and serves as the inflow port 81 a of the tank 80.
- the water drain port 93 drains water remaining in the space 94.
- the backflow prevention mechanism 90 is a horizontal type and the water-receiving port 92 of the backflow prevention mechanism 90 serves as the inflow port 81 a of the tank 80, so that the sanitary washing apparatus 20 can be downsized.
- supply of water into the tank 80 is started after an output of the float switch 72 is switched from an ON signal to an OFF signal and subsequently the first predetermined time A1 is elapsed, and is not limited thereto. That is, for example, supply of water into the tank 80 may be started at a time when an output of the float switch 72 is switched from an ON signal to an OFF signal.
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- Health & Medical Sciences (AREA)
- Public Health (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Hydrology & Water Resources (AREA)
- Water Supply & Treatment (AREA)
- Molecular Biology (AREA)
- Epidemiology (AREA)
- Bidet-Like Cleaning Device And Other Flush Toilet Accessories (AREA)
Abstract
Description
- An embodiment of the disclosure relates to a sanitary washing apparatus.
- Conventionally, a sanitary washing apparatus has been known that is disposed on top of a western style toilet body and washes a human body with discharged water.
- To the sanitary washing apparatus, a backflow prevention mechanism may be attached. The backflow prevention mechanism serves to prevent the backflow of sewage through a flow passage, and to thereby prevent the contamination of the water in the piping. The backflow prevention mechanism may include an air gap which is a space communicating with the atmosphere and disposed at such a position as to split up the flow passage.
- A standard for the backflow prevention mechanism is clearly defined in each of the European countries, and the product in these countries has to meet the standard. In most of the European countries, tap water is hard water, which is known to produce a precipitate (hereinafter "scale") such as calcium carbonate when heated.
- In one known sanitary washing apparatus, a tank with a heating function is disposed at a downstream side of the backflow prevention mechanism so as to heat the water stored therein (see, for example, Japanese Laid-Open Patent Application No.
2010-090621 - However, in a case where a vertical-type backflow prevention mechanism is used, an atmosphere open space is secured in a height direction, and hence, a height of an apparatus is increased, where there is room for improvement from the viewpoint of downsizing. For example, in a case where a vertical-type backflow prevention mechanism is disposed on top of the above-mentioned tank, a height of the tank needs to be reduced in order to secure a height of the vertical-type backflow prevention mechanism.
- It is an object of an aspect of an embodiment to downsize a sanitary washing apparatus.
- A sanitary washing apparatus according to an aspect of an embodiment includes a nozzle, a water passage, a tank, and a backflow prevention mechanism. The nozzle is configured to discharge water toward a private part of a user. The water passage is configured to communicate with the nozzle and a water supply pipe. The tank is disposed on the water passage. The tank is provided with a heating element inside thereof and configured to store water therein. The tank is configured to supply water to the nozzle. The backflow prevention mechanism is disposed on the water passage and upstream of the tank. The water passage includes a first water passage that connects the water supply pipe and the backflow prevention mechanism, and a second water passage that connects the tank and the nozzle. The backflow prevention mechanism includes an air gap communicating with an atmosphere, thereby preventing backflow of water, a water spout port, a water-receiving port, and a water drain port. The water spout port is disposed at an end of the first water passage and spouts water in a horizontal direction. The water-receiving port is disposed to be opposed to the water spout port through the air gap. The water-receiving port is configured to receive water from the water spout port, and serve as an inlet port of the tank. The water drain port is configured to discharge water remaining in the air gap outside of the backflow prevention mechanism.
- According to one aspect of an embodiment, a sanitary washing apparatus includes a tank, a discharge nozzle, and a backflow prevention mechanism. The tank is provided with a heating element inside thereof and stores water therein. The discharge nozzle discharges water in the tank toward a private part of a user. The backflow prevention mechanism has an air gap disposed on an upstream side of the tank and at a site where a flow passage is divided by an atmosphere open space. The backflow prevention mechanism includes a spout port, a water-receiving port, and a water drain port. The spout port is disposed at an end of a flow passage communicating with a water supply pipe and spouts water in a horizontal direction. The water-receiving port is disposed to be opposed to the spout port through the atmosphere open space, receives water spouted from the spout port, and serves as an inflow port of the tank. The water drain port drains water remaining in the space.
- Thus, such a backflow prevention mechanism is a horizontal-type backflow prevention mechanism and a water-receiving port of the backflow prevention mechanism serves as an inflow port of a tank, so that a sanitary washing apparatus can be downsized.
- The sanitary washing apparatus includes a case that houses the tank, the discharge nozzle, and the backflow prevention mechanism. The discharge nozzle is disposed at a central portion of the case. The tank is disposed side by side with the discharge nozzle and includes a water drain channel communicating with the water drain port on an outer wall on a side surface thereof. The water drain port and the water drain channel are disposed at positions closer to the discharge nozzle in the tank. Thereby, a length of a water drain channel can be reduced.
- The water drain port and the water drain channel are formed to have shapes provided by denting the outer wall toward an inside of the tank. Thereby, a water drain channel is not required to be installed as a separate member in a heat exchanged that includes a backflow prevention mechanism, so that the number of parts can be reduced and a tank can be downsized.
- The tank includes a water inflow pipe that communicates with the water-receiving port and includes the outer wall as a portion of a peripheral surface thereof. The water drain channel is disposed adjacent to the water inflow pipe by interposing the outer wall that is a portion of the peripheral surface of the water inflow pipe. Thus, a water drain channel is disposed adjacent to a water inflow pipe at a comparatively low temperature in a tank, so that cold water flowing on a water drain channel can be prevented from drawing heat of, and cooling, hot water in the tank.
- The sanitary washing apparatus includes a pump that is disposed on a downstream side of the tank and supplies water stored in the tank to the discharge nozzle. The case houses the pump on a side of a distal end of a slope part where a top surface is downwardly sloped toward a side of a bowl of a toilet in a side view. Thereby, a dead space of a case can be utilized effectively.
- The tank includes a direction-changing part that causes water spouted from the spout port and passing though the water-receiving port to change a direction of its flow downwardly. Thereby, water received through a water-receiving port can efficiently be guided to a tank.
- According to an aspect of an embodiment, a sanitary washing apparatus can be downsized.
- A more complete appreciation of the invention and many of the attendant advantages thereof will be readily obtained as the same becomes better understood by reference to the following detailed description when considered in connection with the accompanying drawings, wherein:
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FIG. 1 is a perspective view that schematically illustrates a toilet apparatus with a sanitary washing apparatus according to an embodiment; -
FIG. 2 is an illustration diagram that illustrates an example of a configuration of a sanitary washing apparatus; -
FIG. 3 is a perspective view of a sanitary washing apparatus; -
FIG. 4 is a front view that enlarges and illustrates a neighborhood of a heat exchanger; -
FIG. 5 is a plan view that enlarges and illustrates a neighborhood of a heat exchanger; -
FIG. 6 is a cross-sectional view ofFIG. 5 along a line VI-VI; -
FIG. 7 is a diagram that enlarges and illustrates a neighborhood of a backflow prevention mechanism; -
FIG. 8 is a cross-sectional view ofFIG. 5 along a line VIII-VIII; -
FIG. 9 is a cross-sectional view ofFIG. 4 along a line IX-IX; -
FIG. 10 is a perspective view of a strainer; -
FIG. 11 is a perspective view of a cover; -
FIG. 12A is a cross-sectional view ofFIG. 6 along a line XII-XII; -
FIG. 12B is a diagram that illustrates a position of a strainer in a case where water drainage is executed; -
FIG. 12C is a diagram that illustrates a strainer in a detached state; -
FIG. 13 is a cross-sectional view ofFIG. 5 along a line XIII-XIII; -
FIG. 14 is a timing chart that illustrates an example of steps of a process for a sanitary washing apparatus according to an embodiment; -
FIG. 15A is an illustration diagram (part 1) that illustrates a state of water in a tank; -
FIG. 15B is an illustration diagram (part 2) that illustrates a state of water in a tank; -
FIG. 15C is an illustration diagram (part 3) that illustrates a state of water in a tank; -
FIG. 15D is an illustration diagram (part 4) that illustrates a state of water in a tank; -
FIG. 15E is an illustration diagram (part 5) that illustrates a state of water in a tank; -
FIG. 15F is an illustration diagram (part 6) that illustrates a state of water in a tank; -
FIG. 15G is an illustration diagram (part 7) that illustrates a state of water in a tank. - Hereinafter, an embodiment of a sanitary washing apparatus will be described in detail, with reference to the accompanying drawings. This invention is not limited to an embodiment described below.
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FIG. 1 is a perspective view that schematically illustrates a toilet apparatus with a sanitary washing apparatus according to an embodiment. For readily understanding the description,FIG. 1 illustrate a three-dimensional orthogonal coordinate system where a direction of an X-axis, a direction of a Y-axis, and a direction of a Z-axis that are orthogonal to one another are defined and a positive direction of the Z-axis is a vertically upward direction. Such an orthogonal coordinate system may also be illustrated in other drawings to be used for an explanation described below. - As illustrated in
FIG. 1 , atoilet apparatus 1 includes a western style toilet (that will be described as a "toilet" below) 10 and asanitary washing apparatus 20, and is installed in a toilet room. Thetoilet 10 is of a low tank type that executes washing with water stored in awater storage tank 11, and is not limited thereto but may be, for example, of a flush valve type. Thetoilet 10 illustrated inFig. 1 is floor-mounted type. However, thetoilet 10 is not limited thereto but may be of a wall-mounted type or the like. - The
sanitary washing apparatus 20 is disposed on top of thetoilet 10. Thesanitary washing apparatus 20 includes abody part 30, atoilet lid 300, and a non-illustrated toilet seat. Both thetoilet lid 300 and the toilet seat are mounted on thebody part 30 so as to be openable and closable. - The
body part 30 includes acase 31 and anozzle unit 40. Thecase 31 houses thenozzle unit 40 and the like. A detailed configuration of thecase 31 will be described later. -
FIG. 2 is an illustration diagram that illustrates an example of a configuration of thesanitary washing apparatus 20 that includes thenozzle unit 40. As illustrated inFIG. 2 , thenozzle unit 40 includes adischarge nozzle 41 that discharges water toward a private part or the like of a user. In the present specification, "water" does not necessarily mean cold water and may include hot water. - The
discharge nozzle 41 has adischarge hole 42 that is an opening at a tip thereof. Thedischarge nozzle 41 is configured to be movable back and forth with respect to the case 31 (seeFIG. 1 ). For example, a non-illustrated driving source such as a motor is connected to thedischarge nozzle 41. By driving such a driving source, thedischarge nozzle 41 is moved back and forth between a position where thedischarge nozzle 41 has been moved forth into abowl 12 of thetoilet 10 and a position where thedischarge nozzle 41 has been moved back into, and is housed, in thecase 31. At such a position where thedischarge nozzle 41 has been moved forth, thedischarge nozzle 41 discharges water toward a body of a user to wash a private part thereof. - The
sanitary washing apparatus 20 further includes a water supply part (or water passage) 50, acontrol part 200, aseating sensor 210, and anoperation part 220. Thewater supply part 50, thecontrol part 200, and theseating sensor 210 as mentioned above are disposed in thebody part 30. - The
water supply part 50 supplies water from a water supply pipe A that is a water supply source to thenozzle unit 40. Specifically, thewater supply part 50 includes afirst flow passage 60, a hot water storage type heat exchanger 70 (that will be described as a "heat exchanger 70" below), and asecond flow passage 100. - The
first flow passage 60 is a flow passage from the water supply pipe A to abackflow prevention mechanism 90. Thebackflow prevention mechanism 90 will be described in more detail below. Thesecond flow passage 100 is a flow passage from atank 80 to thedischarge nozzle 41 of thenozzle unit 40. Theheat exchanger 70 includes thetank 80 and stores water supplied from the water supply pipe A through thefirst flow passage 60. Water stored in thetank 80 is heated to produce hot water and such produced hot water is supplied to thenozzle unit 40 through thesecond flow passage 100. - Meanwhile, a backflow prevention mechanism needs to be attached to the
sanitary washing apparatus 20 in order to prevent sewage from flowing backward on thefirst flow passage 60 or the like and thereby contaminating the water supply pipe A. Such a backflow prevention mechanism is a mechanism that forms an atmosphere open space that is a space that is open to an atmosphere (air gap) in the middle of a flow passage from the water supply pipe A to thenozzle unit 40 to divide the flow passage. - In a conventional technique, an open-type tank is separately disposed on an upstream side of a tank of a heat exchanger and such an open-type tank is provided with a vertical-type backflow prevention mechanism that spouts water in a vertical direction. Water stored in such an open-type tank is pumped to such a tank of a heat exchanger by a pump disposed on a downstream side of the open-type tank and subsequently supplied to a nozzle unit.
- However, the above-mentioned vertical-type backflow prevention mechanism is large in a height direction to secure a space thereof, and hence, there is room for improvement from the viewpoint of downsizing of a sanitary washing apparatus. In regard to a sanitary washing apparatus in a conventional technique, a size of such an apparatus may be increased by a space for installation of such an open-type tank.
- The above-mentioned open-type tank is configured to be constantly in a full water state in order to prevent a pump from idling, and to discard, to a bowl of a toilet, excess water that is higher than a predetermined water level in the open-type tank. Hence, in a conventional technique, there is also room for improvement from the viewpoint of water saving.
- The
sanitary washing apparatus 20 according to the present embodiment is configured in such a manner that it is possible to attain downsizing thereof and water saving. - As mentioned above, water stored in the
tank 80 of thesanitary washing apparatus 20 according to the present embodiment is heated to produce hot water. Herein, in a case where stored water, that is, water supplied from the water supply pipe A is, for example, hard water that contains a lot of calcium ions or magnesium ions, scale is readily produced by heating so that the scale may accumulate in thetank 80. As such scale flows to thesecond flow passage 100, thedischarge nozzle 41, or the like, on a downstream side of thetank 80, flow passage clogging may be caused thereby. - The
sanitary washing apparatus 20 according to the present embodiment is configured in such a manner that it is possible to readily discharge scale in thetank 80. - In the
sanitary washing apparatus 20, it is preferable to take out hot water produced in thetank 80 efficiently. That is, for example, in a case where a backflow prevention mechanism is configured to be disposed in thetank 80, as hot water in thetank 80 is used to wash a user, a water level in thetank 80 is gradually lowered and cold water is supplied from the water supply pipe A. - The
sanitary washing apparatus 20 according to the present embodiment is configured in such a manner that it is possible to take out heated water from thetank 80 efficiently. Hereinafter, a configuration of thesanitary washing apparatus 20 will be described in detail. - As illustrated in
FIG. 2 , a strainer forwater supply 61, anelectromagnetic valve 62, and aconstant flow valve 63 are disposed on thefirst flow passage 60 in this order from an upstream side thereof. The strainer forwater supply 61 eliminates a foreign substance such as a contaminant that is incorporated in water supplied from the water supply pipe A. Theelectromagnetic valve 62 is a normally-closed-type valve that is in a closed state at time of no energization thereof, and opens or closes thefirst flow passage 60 depending on a control signal from thecontrol part 200. Theconstant flow valve 63 regulates water that flows from the water supply pipe A so as to drain a predetermined flow rate or less thereof. - The
heat exchanger 70 includes the above-mentionedtank 80 and thebackflow prevention mechanism 90 disposed on an upstream side of thetank 80. Thetank 80 and thebackflow prevention mechanism 90 are formed integrally, and this will be described later. - The
tank 80 is provided with aheating element 71, afloat switch 72, athermistor 73, and a bimetal 74. Theheating element 71 is disposed closer to abottom surface 80b inside thetank 80. Theheating element 71 is energized depending on a control signal from thecontrol part 200 to generate heat so that water stored in thetank 80 is heated. For example, a sheath heater can be used for theheating element 71 that is not limited thereto but may be another kind of a heating device such as, for example, a ceramic heater. - The
float switch 72 is disposed at a predetermined position closer to a top of thetank 80, and in a case where a water level in thetank 80 is elevated to a predetermined level or higher, a non-illustrated float rises to output a predetermined signal. That is, thefloat switch 72 has a function of detecting a water level of water stored in thetank 80. In the present embodiment, thefloat switch 72 outputs an ON signal in a case where a water level in thetank 80 is a predetermined level or higher, and thefloat switch 72 will be described later by usingFIG. 14 . - The
thermistor 73 and the bimetal 74 are installed inside thetank 80. Positions of installation of thethermistor 73 and the bimetal 74 will be described later. - The
thermistor 73 detects temperature of water in thetank 80 and outputs a signal that indicates detected temperature. The bimetal 74 is interposed in an energization circuit (not-illustrated) for theheating element 71. The bimetal 74 opens a contact in an energization circuit in a case where temperature of water in thetank 80 is higher than a predetermined level, so that energization of theheating element 71 is blocked. Such a predetermined temperature can be set arbitrary, and it is preferable to set, for example, a value enabling to detect an excessive temperature rise of water in the tank. - Thereby, the bimetal 74 functions as a safety device that prevents water in the
tank 80 from being excessively heated by theheating element 71. In a case where temperature of water in thetank 80 after blocking energization is lower than a predetermined level, the bimetal 74 may be configured in such a manner that the above-mentioned contact is automatically restored or closed to restart heating by theheating element 71. - In the
sanitary washing apparatus 20, astrainer 110 is interposed between thetank 80 and thesecond flow passage 100. Apump 130 is disposed on thesecond flow passage 100. Thestrainer 110 filters water that flows from thetank 80 to thepump 130. Specifically, thestrainer 110 eliminates a foreign substance such as scale that is contained in water that flows out of thetank 80. Thestrainer 110 is configured to be attachable to and detachable from thetank 80, and this will be described later. - The
pump 130 is disposed on a downstream side of thetank 80 and thestrainer 110. Thepump 130 is driven in response to a control signal from thecontrol part 200 and supplies water stored in thetank 80 to thedischarge nozzle 41. - A
vacuum breaker 140 is connected to thesecond flow passage 100 at a position on a downstream side of thetank 80 and an upstream side of thedischarge nozzle 41. An atmosphereopen channel 141 that is a channel with one end that is open to an atmosphere is connected to thevacuum breaker 140. By thevacuum breaker 140 that is thus configured, for example, a backward flow from thedischarge nozzle 41 to theheat exchanger 70 or the like can be prevented from being produced in a case where a negative pressure is produced on thesecond flow passage 100. - A pipe diameter of the
second flow passage 100 is set to be greater than a diameter of thedischarge hole 42 of thedischarge nozzle 41. Thus, scale clogging can be prevented by increasing a pipe diameter of a flow passage that leads to thedischarge nozzle 41 from thetank 80. - The
seating sensor 210 is disposed at, for example, an appropriate position of the case 31 (seeFIG. 1 ) and detects that a user sits on a toilet seat. Theseating sensor 210 outputs a predetermined signal that indicates seating in a case where the seating is detected. For example, a light-projecting-and-receiving-type distance sensor can be used for theseating sensor 210. - The
seating sensor 210 is not limited to the above-mentioned distance sensor and another kind of sensor such as, for example, a load sensor that detects a load of a user that acts on a toilet seat may be used. Theseating sensor 210 is not necessarily required to be disposed in thecase 31 and may be disposed on, for example, a wall surface or the like of a toilet room. In the present embodiment, theseating sensor 210 outputs an ON signal in a case where seating of a user is detected, and theseating sensor 210 will be described later by usingFIG. 14 . - The
operation part 220 includes an operation button, an operation knob, or the like, such that a user inputs a start instruction for starting washing of a human body or a stop instruction for stopping such washing, and is disposed at an appropriate position in a toilet room. Theoperation part 220 outputs a signal that indicates a start instruction or the like that is input by a user through the operation button or the like. For example, a remote controller can be used for theoperation part 220 that is not limited thereto and may be mounted on thebody part 30. - Various signals that are output from the
float switch 72, thethermistor 73, theseating sensor 210, and theoperation part 220 as mentioned above are input to thecontrol part 200. Thecontrol part 200 controls the entirety of thesanitary washing apparatus 20, and includes, for example, a non-illustrated arithmetic processing unit such as a Central Processing Unit (CPU) and a non-illustrated storage device such as Random Access Memory (RAM). - The
control part 200 executes a process for controlling theelectromagnetic valve 62, theheating element 71, thepump 130, thenozzle unit 40, and the like, based on various input signals, and a content of such a process will be described in detail later. A reference symbol inFIG. 2 that has not been described will be described by using another drawing, and the reference symbol is provided inFIG. 2 to correspond to such another drawing. - Next, the above-mentioned
sanitary washing apparatus 20 will be described in more detail with reference toFIG. 3 and subsequent figures.FIG. 3 is a perspective view of thesanitary washing apparatus 20. Any view inFIG. 3 and subsequent figures that illustrate a configuration of thesanitary washing apparatus 20 is a schematic diagram. - As illustrated in
FIG. 3 , thecase 31 of thesanitary washing apparatus 20 contains various components such as thetank 80 of theheat exchanger 70, thebackflow prevention mechanism 90, thedischarge nozzle 41, thepump 130, and thecontrol part 200. - The
case 31 includes acase plate 31 a and acase cover 31 b. Thecase plate 31 a (that will be referred to as a "plate 31 a" below) includes a plate-shaped bottom surface 31a1 and is mounted on top of the toilet 10 (seeFIG. 1 ). Theplate 31 a is formed into a shape with a longitudinal direction along an X-axis and a transverse direction along a Y-axis in a top view. Various components such as thetank 80 are disposed on theplate 31 a. - The case cover 31 b is configured to be attachable to and detachable from the
plate 31 a and mounted so as to cover tops of various components disposed on theplate 31 a. InFIG. 3 , for convenience of understanding, the case cover 31 b is indicated by an imaginary line so that an inside of thecase 31 is indicated transparently. - Herein, positions of various components disposed in the
case 31 will be described. Thenozzle unit 40 that includes thedischarge nozzle 41 is disposed at acentral part 31 c of thecase 31.FIG. 3 illustrates a state where thedischarge nozzle 41 is housed in acylindrical housing case 43. - In an internal space of the
case 31, thetank 80, thepump 130, and the like are disposed side by side on a left side of thedischarge nozzle 41. In the present specification, a term that represents a direction such as a "left side" or a "right side" means a "left side" or a "right side" when thebowl 12 is disposed at a front side in a top view of thesanitary washing apparatus 20 in a state where it is mounted on thetoilet 10. Specifically, a negative direction of an X-axis will be referred to as a "left side" and a positive direction of the X-axis will be referred to as a "right side". A negative direction of a Y-axis will be referred to as a "front side" and a positive direction of the Y-axis will be referred to as a "back side". - In the
case 31, an electronic component such as thecontrol part 200 is disposed on a right side of thedischarge nozzle 41. Thus, an internal space of thecase 31 is divided into left and right regions by thedischarge nozzle 41 as a boundary, where thewater supply part 50 that includes thetank 80 and the like is disposed in one region and an electronic component such as thecontrol part 200 is disposed in the other region. Thereby, for example, a water droplet produced in thewater supply part 50 or the like can be prevented from readily scattering toward an electronic component. - In the above-mentioned other region, a deodorization unit or the like is also disposed, where illustration thereof is omitted in
FIG. 3 . Positions of various disposed components illustrated inFIG. 3 or the like are merely illustrations and not limiting. - Next, configurations of the
tank 80 of theheat exchanger 70 and thebackflow prevention mechanism 90 will be further described in detail.FIG. 4 is a front view that enlarges and illustrates a neighborhood of theheat exchanger 70 illustrated inFIG. 3 andFIG. 5 is a plan view that enlarges and illustrates a neighborhood of theheat exchanger 70 illustrated inFIG. 3 .FIG. 4 andFIG. 5 illustrate a state where the case cover 31 b is removed from theplate 31 a. - As illustrated in
FIG. 4 andFIG. 5 , thebackflow prevention mechanism 90 is disposed on top of thetank 80. Thebackflow prevention mechanism 90 is disposed on an upper right portion of thetank 80, in other words, on a side of thedischarge nozzle 41 on top of thetank 80. As described above, thebackflow prevention mechanism 90 is disposed on top of thetank 80 and not limited thereto, and thebackflow prevention mechanism 90 may be disposed at, for example, an upper position that separates from thetank 80 by a predetermined distance. -
FIG. 6 is a cross-sectional view ofFIG. 5 along a line VI-VI.FIG. 6 omits illustration of theplate 31 a. As illustrated inFIG. 6 , thebackflow prevention mechanism 90 includes aspout port 91, a water-receivingport 92, and awater drain port 93. -
FIG. 7 is a diagram that enlarges and illustrates a neighborhood of thebackflow prevention mechanism 90 illustrated inFIG. 6 . As illustrated inFIG. 7 , thespout port 91 is disposed at anend 60a of thefirst flow passage 60 communicating with the water supply pipe A (seeFIG. 2 ). Thespout port 91 spouts water supplied from the water supply pipe A in a horizontal direction (for example, a positive direction of an X-axis). - In
FIG. 7 , water spouted from thespout port 91 is indicated by an arrow of broken line D1. In the present specification, a term of "horizontal", "vertical", or the like does not necessarily need mathematically strict precision and a substantial tolerance or error or the like is permitted. - The water-receiving
port 92 is an aperture that is disposed to be opposed to thespout port 91 through an atmosphereopen space 94 that is a space that is open to an atmosphere. The water-receivingport 92 receives water spouted from thespout port 91. Water received by the water-receivingport 92 flows into thetank 80. In an example illustrated inFIG. 7 , the water-receivingport 92 is formed in such a manner that an aperture plane thereof is vertical, is not limited thereto, and may be formed, for example, in such a manner that such an aperture plane is inclined. - Thus, the
backflow prevention mechanism 90 according to the present embodiment is a horizontal-type backflow prevention mechanism that spouts water toward the atmosphereopen space 94 in a horizontal direction, and has anair gap 94a (seeFIG. 6 ) disposed at a site B where a flow passage is divided by the atmosphereopen space 94. - A distance C1 from the
spout port 91 to the water-receivingport 92 in thespace 94 is set at a value that meets a standard defined in a country or place where thesanitary washing apparatus 20 is installed, and set at, for example, 20 mm or greater. - The
water drain port 93 discharges water remaining in thespace 94, for example, outside of thebackflow prevention mechanism 90. Thewater drain port 93 is an aperture disposed under thespace 94 that is present between thespout port 91 and the water-receivingport 92. As illustrated by an arrow of dashed-dotted line D21 inFIG. 7 , thewater drain port 93 receives and discharges a portion of water spouted from thespout port 91, for example, water with insufficient water force so as not to be received by the water-receivingport 92, in other words, water that does not reach the water-receivingport 92 but remains in thespace 94. - The
water drain port 93 discharges water that flows backward from thetank 80, as illustrated by an arrow of dashed-dotted line D22. Water discharged to thewater drain port 93 is discharged to thetoilet 10 through awater drain channel 85 formed in thetank 80, and this will be described later. - Thus, the
sanitary washing apparatus 20 according to the present embodiment is provided with the above-mentionedbackflow prevention mechanism 90, and thereby, for example, a backward flow from thetank 80 to the water supply pipe A can be prevented. - In the present embodiment, the
backflow prevention mechanism 90 is a horizontal-type backflow prevention mechanism, and hence, thesanitary washing apparatus 20 can be downsized. That is, for example, if thebackflow prevention mechanism 90 is a vertical-type backflow prevention mechanism that spouts water in a vertical direction, the above-mentioned distance C1 in thespace 94 is secured in a vertical direction. Hence, in a case where a vertical-type backflow prevention mechanism is used, a height of thesanitary washing apparatus 20 may be increased by the distance C1 in thespace 94. - Because the
backflow prevention mechanism 90 in the present embodiment is a horizontal-type backflow prevention mechanism that secures the distance C1 in thespace 94 in a horizontal direction, such a height can be reduced, and hence, thesanitary washing apparatus 20 can be downsized even when thebackflow prevention mechanism 90 is disposed on top of thetank 80. - The above-mentioned
backflow prevention mechanism 90 is formed integrally with thetank 80, so that thesanitary washing apparatus 20 can be further downsized. - For a detailed description, as illustrated in
FIG. 6 , thetank 80 is formed into a rectangular shape or a substantially rectangular shape that has a space capable of storing water inside thereof, in a cross-sectional side view. Thetank 80 includes aninflow port 81 a, awater inflow pipe 81, anoutflow port 82b, awater outflow pipe 82, awater drain hole 83, a direction-changingpart 84, and thewater drain channel 85. Thewater drain channel 85 may be disposed outside thetank 80. - Water supplied from the
first flow passage 60 through thebackflow prevention mechanism 90 flows into theinflow port 81 a of thetank 80. Theinflow port 81 a is the above-mentioned water-receivingport 92 of thebackflow prevention mechanism 90. That is, in the present embodiment, the water-receivingport 92 serves as theinflow port 81 a of thetank 80. Because the water-receivingport 92 serves as theinflow port 81 a of thetank 80, the space 94 (air gap 94a) of thebackflow prevention mechanism 90 is also formed on top of thetank 80. - Thus, a part or all of components of the
backflow prevention mechanism 90 is/are formed integrally with thetank 80, and thereby, for example, the number of components can be reduced. Thereby, even when thebackflow prevention mechanism 90 is disposed on top of thetank 80, a height thereof can be reduced, and as a result, thesanitary washing apparatus 20 can be further downsized. - The
backflow prevention mechanism 90 is formed integrally with thetank 80, and hence, it is also possible to reduce man-hours for installing thebackflow prevention mechanism 90 in thetank 80 in a process for producing thesanitary washing apparatus 20. - The
spout port 91 that is installed in thetank 80 is illustrated inFIG. 6 as an example, and is not limited thereto but may be formed integrally with thetank 80. The water-receivingport 92 is configured to serve as theinflow port 81 a in the above description, and is not limited thereto but may be configured in such a manner that the water-receivingport 92 as a separate body is installed in theinflow port 81 a. - The direction-changing
part 84 in thetank 80 is formed at a position to be opposed to thespout port 91 and on an opposite side thereof with respect to theinflow port 81 a, in other words, at a position where water passing through theinflow port 81 a that serves as the water-receivingport 92 impinges thereon. - As illustrated in
FIG. 7 , the direction-changingpart 84 includes a direction-changingsurface 84a that has a predetermined elevation angle α with respect to an X-axis that is a direction of a spout of water from thespout port 91. Such a predetermined elevation angle α is set at a value that is, for example, greater than 0 degrees and less than 90 degrees (0° < α < 90°). Therefore, as indicated by the arrow D1, the direction-changingpart 84 causes water spouted from thespout port 91 and passing through the water-receiving port 92 (inflow port 81 a) to change a direction of its flow downwardly. Thereby, received water can efficiently be guided into thetank 80. - As is well-illustrated in
FIG. 6 , thewater inflow pipe 81 is communicated with theinflow port 81 a and formed to extend in a negative direction of a Z-axis. Anoutlet 81 b of thewater inflow pipe 81 is disposed under theinflow port 81 a. Specifically, theoutlet 81 b of thewater inflow pipe 81 is positioned, for example, closer to thebottom surface 80b of thetank 80 and further in a neighborhood of theheating element 71. InFIG. 6 , anoutlet 181 b indicated by an imaginary line is also illustrated, and such anoutlet 181 b will be described in a variation described below. - Herein, a shape of the
water inflow pipe 81 will be described with reference toFIG. 8. FIG. 8 is a cross-sectional diagram ofFIG. 5 along a line VIII - VIII.FIG. 8 illustrates a longitudinal cross section of thewater inflow pipe 81. - As illustrated in
FIG. 8 , thewater inflow pipe 81 is formed in such a manner that a cross-sectional area of a site close to theoutlet 81 b (for example, a site indicated by areference symbol 81 b1) is greater than or equal to a cross-sectional area of afar site 81 a1.FIG. 8 illustrates a site around theinflow port 81 a as an example of thefar site 81 a1. - The
water inflow pipe 81 flows water from theinflow port 81 a located upstream to theoutlet 81 b located downstream and is formed in such a manner that a width of a flow passage is increased in a direction of such a water flow. That is, thewater inflow pipe 81 is formed in such a manner that a width W81 b1 of a flow passage at thesite 81 b1 close to theoutlet 81 b is greater than or equal to a width W81a1 of a flow passage at thefar site 81 a1. - Thereby, inflow water can be guided into the
tank 80 while a flow rate thereof is reduced.FIG. 8 illustrates a value of a flow rate by a length of an arrow D3 or D4. That is,FIG. 8 indicates that a flow rate (arrow D4) of thesite 81 b1 close to theoutlet 81 b is less than a flow rate (arrow D3) of thefar site 81 a1. - Thus, water with a reduced flow rate is guided into the
tank 80, so that, for example, floating of scale in thetank 80 can be prevented and water before heating can be held on bottom of thetank 80. - By returning to descriptions for
FIG. 6 , theoutflow port 82b is an aperture that is drilled along a direction of a Z-axis (vertical direction) on bottom of thetank 80 and flows water in thetank 80 to the second flow passage 100 (seeFIG. 2 ) through thestrainer 110. InFIG. 6 , a center line of theoutflow port 82b is indicated by areference symbol 82c. - The
water outflow pipe 82 is communicated with theoutflow port 82b and extends in a positive direction of a Z-axis to form anupward inlet 82a. Thus, theinlet 82a of thewater outflow pipe 82 is upward, and hence, for example, scale accumulating on thebottom surface 80b of thecase 31 can be prevented from being readily introduced. - The
inlet 82a of thewater outflow pipe 82 is disposed at a position higher than theoutlet 81 b of thewater inflow pipe 81 by a predetermined distance C2. In thetank 80, theinlet 82a of thewater outflow pipe 82 is positioned on top of a neighborhood of a side surface on an opposite side of a side surface where theoutlet 81 b of thewater inflow pipe 81 is disposed. - Therefore, water passing through the
backflow prevention mechanism 90 is guided by thewater inflow pipe 81 so as to flow into a bottom of thetank 80, and is heated by theheating element 71. As indicated by an arrow D5, heated water is directed upward in thetank 80 by convection thereof, flows to theinlet 82a of thewater outflow pipe 82, passes through thewater outflow pipe 82, and flows out through theoutflow port 82b. - Thus, in the
sanitary washing apparatus 20 according to the present embodiment, heated water is directed upward by convection thereof and flows out through theoutflow port 82b sequentially, and hence, water before heating does not readily flow out, so that heated water can be taken out from thetank 80 efficiently. The predetermined distance C2 is appropriately set based on a volume of thetank 80, a performance of thepump 130, or the like. - In the
sanitary washing apparatus 20 according to the present embodiment, thetank 80 of theheat exchanger 70 is configured as mentioned above, and hence, a configuration that separately provides an open-type tank having a backflow prevention mechanism to discard excess water like a conventional technique is not required, so that water can be saved. - As illustrated in
FIG. 6 , the bimetal 74 and thethermistor 73 as mentioned above are disposed at positions lower than theinlet 82a of thewater outflow pipe 82. Therefore, for example, even when washing of a human body is executed by thedischarge nozzle 41 to lower water level of thetank 80, the bimetal 74 and the like are not exposed above water in thetank 80. Thereby, in the present embodiment, the bimetal 74 or thethermistor 73 can reliably be prevented from erroneously detecting air temperature. - The
water drain hole 83 is disposed on a lower side of a side surface of thetank 80 and sealed with thestrainer 110. Sealing with thestrainer 110 will be described later. A position of thewater drain hole 83 as illustrated inFIG. 6 is an illustration and not limited thereto. - For example, as water is drained in order to execute cleaning of the
tank 80 or the like, thewater drain hole 83 is not sealed with thestrainer 110, namely, is provided in an open state, so that water stored in thetank 80 is discharged to exterior thereof. - As illustrated in
FIG. 6 , thewater drain hole 83 is provided in such a manner that at least a portion of an aperture in thetank 80 is disposed under theheating element 71. Thereby, in the present embodiment, scale in thetank 80 can be discharged efficiently. - Specifically, for example, in a case where the
heating element 71 with an elongated cylindrical shape is inserted from a side surface of, and disposed, in thetank 80 as illustrated inFIG. 6 , thewater drain hole 83 is disposed in such a manner that acenter line 83c is disposed under acenter line 71 a of theheating element 71. Thecenter line 83c of thewater drain hole 83 is a line that passes through a center of an aperture plane in thetank 80. Thecenter line 71 a of theheating element 71 is, for example, a line that passes through a center of a cross section of theheating element 71 in a direction vertical to an axial direction thereof. - Temperature of the
heating element 71 is comparatively high, and hence, scale is readily produced neat theheating element 71. The present embodiment is configured as mentioned above, where water in thetank 80 flows so as to go around a periphery of theheating element 71 as indicated by an arrow D6 and is discharged from thewater drain hole 83 while scale closer to theheating element 71 is involved therein, so that scale in thetank 80 can be discharged efficiently. - Next, the
water drain channel 85 will be described. Thewater drain channel 85 communicates with the above-mentionedwater drain port 93 of thebackflow prevention mechanism 90. Thewater drain channel 85 is disposed on anouter wall 80a on a side surface of thetank 80 and formed so as to be exposed partially, as illustrated inFIG. 3 to FIG. 5 and the like. Theouter wall 80a is a part of a wall of thetank 80 constituting a part of thewater drain channel 85. - The
water drain channel 85 that is disposed on theouter wall 80a of thetank 80 will be described with reference toFIG. 9. FIG. 9 is a cross-sectional view ofFIG. 4 along a line IX-IX. Whereas acover 95 is mounted on a part of thewater drain channel 85 inFIG. 4 ,FIG. 9 illustrates a state where thecover 95 is removed. InFIG. 9 , apartition wall 80c that is formed in thetank 80 is indicated by a broken line in order to distinguish thepartition wall 80c from theouter wall 80a of thetank 80. - As illustrated in
FIG. 9 , thewater drain port 93 and thewater drain channel 85 are formed into shapes provided by denting theouter wall 80a of thetank 80 toward an inside of thetank 80. Thereby, in the heat exchanger that includes thebackflow prevention mechanism 90, thewater drain channel 85 is not required to be mounted as a separate member, so that the number of components can be reduced and thetank 80 can be downsized. - As illustrated in
FIG. 9 , thewater inflow pipe 81 is formed in such a manner that theouter wall 80a of thetank 80 is a part of a peripheral surface thereof. InFIG. 9 , theouter wall 80a that is a part of a peripheral surface of thewater inflow pipe 81 is indicated by areference symbol 81 c provided thereto. Thewater drain channel 85 is disposed adjacent to thewater inflow pipe 81 while theouter wall 81 c (80a) that is a part of a peripheral surface of thewater inflow pipe 81 is interposed therebetween. InFIG. 9 , water discharged from thewater drain port 93 and flowing on the water drain channel is indicated by an arrow D7. - Thereby, the
water drain channel 85 is disposed adjacent to and along thewater inflow pipe 81 at a comparatively low temperature in thetank 80 of theheat exchanger 70. Hence, water that flows on thewater drain channel 85, that is, cold water that does not flow into thetank 80, can be prevented from drawing heat of, and cooling, hot water in thetank 80. - As illustrated in
FIG. 3 to FIG. 5 and the like, thewater drain port 93 and thewater drain channel 85 are disposed at positions in thetank 80 and closer to thedischarge nozzle 41. Thereby, a length of thewater drain channel 85 of thebackflow prevention mechanism 90 can be reduced. - Herein, a water drain function or the like on the
case 31 will be described with reference toFIG. 5 in order to explain a reason why a length of the above-mentionedwater drain channel 85 can be reduced. - As illustrated in
FIG. 5 , thecase 31 includes adischarge hole 32, awater drainage channel 33, and a taking-out hole (or opening) 34. For example, a plurality of the discharge holes 32 (two of them are illustrated inFIG. 5 ) are drilled in thebottom surface 31 a1 of theplate 31 a closer to thecentral part 31 c of thecase 31. - Thereby, for example, a member that readily produces a water droplet thereon, such as the
discharge nozzle 41, is disposed around thecentral part 31 c of thecase 31, and hence, such a water droplet can readily be discharged from thedischarge hole 32. - The
discharge hole 32 is disposed at, for example, a position to face the bowl 12 (seeFIG. 2 ) of thetoilet 10. Thereby, water that passes through thedischarge hole 32 is discharged to thebowl 12. The number, positions of disposition, and shapes of the discharge holes 32 illustrated inFIG. 5 and the like are merely illustrations and not limited thereto. - The
water drainage channel 33 is a water drain channel that is used at time of water drainage of thetank 80. Specifically, thewater drainage channel 33 is a gutter-shaped wall member that stands on thebottom surface 31 a1 of theplate 31 a. Water drainage of thetank 80 is executed by discharging water from thewater drain hole 83 of thetank 80 with thestrainer 110 installed therein, as described later. Therefore, thewater drainage channel 33 is shaped such that water discharged from thewater drain hole 83 is guided to thedischarge hole 32, as indicated by an arrow D8. - Thereby, water that flows out of the
water drain hole 83 can readily be discharged to thetoilet 10 through thedischarge hole 32 or the like. It is preferable to provide thebottom surface 31 a1 of theplate 31 a with a gradient that is inclined toward thedischarge hole 32. Thereby, water on the bottom surface 31a1 can smoothly be discharged toward thedischarge hole 32. - As is also well-illustrated in
FIG. 3 , the taking-outhole 34 is an aperture disposed on a side surface of thecase 31, and is disposed at a site that corresponds to a position where thestrainer 110 is disposed. Therefore, the taking-outhole 34 is a hole for taking out thestrainer 110 from thetank 80 as thestrainer 110 is removed and cleaned. The taking-outhole 34 is an example of an opening. - As mentioned above, while the
discharge port 32 is disposed closer to thedischarge nozzle 41 in thecase 31, thewater drain port 93 and thewater drain channel 85 are also disposed at positions in thetank 80 and closer to thedischarge nozzle 41. Thereby, a length of thewater drain channel 85 can be reduced. - As illustrated in
FIG. 6 , thetank 80 is supplied with water through thewater inflow pipe 81 connected to thebackflow prevention mechanism 90 that is open to an atmosphere. Hence, a mechanism is needed that releases air on an upper side in thetank 80 when water is supplied from thewater inflow pipe 81 to elevate water level of thetank 80, or introduces air into thetank 80 when water in thetank 80 flows out to lower water level therein. - In the
tank 80 according to the present embodiment, anair hole 86 is disposed at an upper side. Air that is introduced into or released from thetank 80 in accordance with a variation of a water level therein passes through theair hole 86. Thereby, air in thetank 80 can be released or air can be introduced into thetank 80. - An intake or
exhaust channel 87 is connected to theair hole 86. For example, a tube or the like can be used for the intake orexhaust channel 87 that is not limited thereto. - The intake or
exhaust channel 87 extends to a neighborhood of thedischarge hole 32 on the bottom surface 31a1 of theplate 31a, as illustrated inFIG. 3 to FIG. 5 . Thereby, water that is released from theair hole 86 toward exterior of thetank 80 is discharged from thedischarge hole 32 through the intake orexhaust channel 87, and hence, water can be prevented from being diffused in thecase 31. - As illustrated in
FIG. 2 orFIG. 6 , the intake orexhaust channel 87 is configured to serve as the atmosphereopen channel 141 of thevacuum breaker 140. InFIG. 2 andFIG. 6 , a position where the intake orexhaust channel 87 and the atmosphereopen channel 141 join together is indicated by a reference symbol P. - Thus, the intake or
exhaust channel 87 does not only function as an atmosphere open channel that is a channel with one end that is open to an atmosphere, for theair hole 86, but also functions as the atmosphereopen channel 141 of thevacuum breaker 140. Thereby, the intake orexhaust channel 87 and the atmosphereopen channel 141 can be partially shared with each other, so that the number of components can be reduced and cost can be reduced. - Next, configurations of the
strainer 110 and acover 120 will be described that are disposed on a downstream side of theoutflow port 82b of thetank 80. - In an example illustrated in
FIG. 6 , a downstream side of theoutflow port 82b is communicated with thewater drain hole 83 and the second flow passage 100 (not illustrated inFIG. 6 ), and thewater drain hole 83 is mounted and sealed with thestrainer 110 as mentioned above. Therefore, when thewater drain hole 83 is sealed with thestrainer 110, water in thetank 80 flows from theoutflow port 82b to thesecond flow passage 100 through thestrainer 110, as described below. Thetank 80 includes acover 120 and thecover 120 is mounted for thewater drain hole 83. -
FIG. 10 is a perspective view of thestrainer 110 andFIG. 11 is a perspective view of thecover 120.FIG. 12A is a cross-sectional view ofFIG. 6 along a line XII - XII. - As illustrated in
FIG. 10 , thestrainer 110 includes ahead 111, ashaft 112, and acap 113. Thehead 111 is formed into a cylindrical shape or a substantially cylindrical shape and includes anoperation knob 111 a and aflange 111 b. - The
operation knob 111 a is formed on oneend 111 c of thehead 111. Theoperation knob 111 a is a protrusion that is provided to protrude from theend 111 c in a direction of separation therefrom, and such a protrusion is held and rotationally-operated by a user or a tool. - Because the above-mentioned operation is executed at timing other than timing of washing of a human body by the
sanitary washing apparatus 20, a "user" herein may be different from a user whose body is washed thereby. A shape of theoperation knob 111 a illustrated inFIG. 10 and the like is an illustration, is not limited thereto, and may be, for example, another shape such as a concave shape. - The
flange 111 b is formed on theother end 111 d of thehead 111 and provided to extend in a direction vertical to an axial direction of thehead 111 with a cylindrical shape. - The
shaft 112 is formed so as to be continuous with thehead 111 and formed into a cylindrical shape or substantially cylindrical shape with a diameter less than that of thehead 111. The shaft includes amale screw 112a, aflat part 112b, and afilter frame 112c. - The
male screw 112a is disposed on theshaft 112 on a side of thehead 111. Themale screw 112a is partially disposed on theshaft 112 on a side of thehead 111. Thereby, for example, a user can execute attachment or detachment of thestrainer 110 with respect to thewater drain hole 83 as described below, with a comparatively small number of rotational operations. Themale screw 112a is an example of an engagement part. - The
flat part 112b is a flat site where themale screw 112a is not formed in an axial direction on a side of thehead 111 of theshaft 112. Theflat part 112b is formed at, for example, a position under a nominal diameter of themale screw 112a. A function of the above-mentionedflat part 112b will be described later. - The
filter frame 112c is an aperture disposed around anend 112d of theshaft 112 on an opposite side of thehead 111. Afilter 114 is set in thefilter frame 112c. - The
filter 114 is made of a material that does not pass a foreign substance such as scale but pass water. For example, a non-woven fabric, a mesh, or the like can be used for thefilter 114 that is not limited thereto. The numbers or shapes of thefilter frame 112c and thefilter 114 illustrated inFIG. 10 and the like are illustrations and not limited thereto. - As is well-illustrated in
FIG. 12A , thecap 113 is formed into a cylindrical shape or substantially cylindrical shape with a diameter less than that of theshaft 112, and includes a sealingpart 113a. The sealingpart 113a is formed into a disc shape or a substantially disc shape, and is disposed on anend 113b of thecap 113. A diameter of the sealingpart 113a is set at, for example, a value that is slightly less than an aperture diameter of thewater drain hole 83 in thetank 80. - The
cap 113 configured as mentioned above is inserted into and engages with a hollow portion of theshaft 112, where a head thereof is anend 113c (seeFIG. 12A ) on an opposite side of theend 113b with the sealingpart 113a disposed thereon. A length of thecap 113 is set at, for example, a value such that the sealingpart 113a is exposed from theshaft 112 in a state where thecap 113 is engaged with theshaft 112, and the sealingpart 113a is positioned at an aperture of thewater drain hole 83 in thetank 80 in a state where thestrainer 110 is mounted for thewater drain hole 83. - The
strainer 110 with thecap 113 that is a separate member with respect to thehead 111 and theshaft 112 is used in the above description, and is not limited thereto, where, for example, thehead 111, theshaft 112, and thecap 113 may be integrated. Thehead 111, theshaft 112, and thecap 113 may be separate from one another or any one of them may be separate. - The
strainer 110 further includes afirst seal member 116a and asecond seal member 116b. For example, an O-ring can be used for the first orsecond seal member - The
first seal member 116a is mounted on theshaft 112 on a side of thehead 111. Thefirst seal member 116a seals a gap between theshaft 112 and thewater drain hole 83 in a watertight manner when thestrainer 110 is disposed at a position where thewater drain hole 83 is sealed thereby. - The
second seal member 116b is mounted on the sealingpart 113a of thecap 113. Thesecond seal member 116b seals a gap between the sealingpart 113a and thewater drain hole 83 in a watertight manner when thestrainer 110 is disposed at a position where thewater drain hole 83 is sealed thereby. - As illustrated in
FIG. 11 , thecover 120 includes aperipheral surface 120a, anengagement part 120b, and anopening 120c. Thecover 120 also includes oneend 120d and theother end 120f. Theperipheral surface 120a is formed into a cylindrical shape or a substantially cylindrical shape. A hole forfixation 120e is drilled in theperipheral surface 120a closer to oneend 120d. - As illustrated in
FIG. 12A , a protrusion forfixation 83a with a shape corresponding to the hole forfixation 120e is formed on an outlet side of thewater drain hole 83. Therefore, the protrusion forfixation 83a is inserted into the hole forfixation 120e and installed in thewater drain hole 83, so that thecover 120 is fixed on an outlet side of thewater drain hole 83. - As illustrated in
FIG. 11 , theengagement part 120b of thecover 120 is disposed in anotch 120g disposed on theperipheral surface 120a on a side of theother end 120f. For example, a plurality (for example, two) of theengagement parts 120b are disposed on theperipheral surface 120a at substantially regular intervals. A claw 120b1 that protrudes in an inner radial direction is formed at a tip of theengagement part 120b. - In
FIG. 11 , the twoengagement parts 120b are disposed on theperipheral surface 120a at positions that are opposed to each other, where the number or positions of disposition of theengagement parts 120b are illustrations and not limited thereto. - The
cover 120 is fabricated by using a material that has flexibility (for example, a resin or the like). Thereby, thecover 120 that includes theengagement part 120b has flexibility, and hence, theengagement part 120b is elastically deformable in a radial direction. - The
opening 120c is formed in a rectangular shape in a bottom view and a plurality of (for example, two)openings 120c are formed on a lower side of theperipheral surface 120a in a state where thecover 120 is installed in thewater drain hole 83. Theopening 120c functions as a flow passage for passing water discharged from thetank 80 through thewater drain hole 83, and this matter will be described later. - In
FIG. 11 , a shape of theopening 120c is a rectangular shape, is not limited thereto, and may be another shape such as, for example, a circular shape or an elliptical shape. The number of theopenings 120c is not limited to an example illustrated inFIG. 11 , and may be one or three or more. - Herein, a dimension of the
cover 120 relative to thestrainer 110 will be described. As illustrated inFIG. 12A , an inner diameter E1 of theperipheral surface 120a of thecover 120 is set to be greater than an outer diameter of theflange 111 b of thestrainer 110. - A distance E2 between the claws 120b1 that are oppositely disposed in the
cover 120 is set to be less than an outer diameter of theflange 111 b. An outer diameter of theflange 111 b is a site with a maximum diameter in thestrainer 110. - The
cover 120 configured as mentioned above is installed in thewater drain hole 83 so that oneend 120d of thecover 120 is communicated with thewater drain hole 83. - A
female screw 83b capable of engaging with themale screw 112a is formed on thewater drain hole 83 of thetank 80. Therefore, themale screw 112a is engaged with thefemale screw 83b, so that thestrainer 110 is installed in thewater drain hole 83. Themale screw 112a is loosened with respect to thefemale screw 83b, so that thestrainer 110 is removed from thewater drain hole 83. - Thus, the
strainer 110 is provided so as to be attachable to and detachable from thewater drain hole 83, and hence, thestrainer 110 is removed from thewater drain hole 83, so that scale in thetank 80 can reliably be discharged. - Next, a specific function of the
strainer 110 will be described. Hereinafter, for thesanitary washing apparatus 20, a case of a normal operation that executes washing of a human body or the like, a case where water drainage for thetank 80 is executed, and a case where cleaning of thestrainer 110 is executed will be described separately. -
FIG. 12A illustrates a position of thestrainer 110 in a case of a normal operation.FIG. 12B is a diagram that illustrates a position of thestrainer 110 in a case where water drainage for thetank 80 is executed, andFIG. 12C is a diagram that illustrates thestrainer 110 having been removed in a case where cleaning of thestrainer 110 is executed. - As illustrated in
FIG. 12A , in thesanitary washing apparatus 20 in a case of a normal operation thereof, thestrainer 110 is engaged with and installed in thewater drain hole 83 and positioned so as to seal thewater drain hole 83. - Herein, the
outflow port 82b of thetank 80 is positioned around thefilter 114 of thestrainer 110. It is preferable for theoutflow port 82b to be positioned in such a manner that thecenter line 82c is orthogonal to thecenter line 83c of thewater drain hole 83. Thereby, a die for thetank 80 can readily be fabricated, as compared with, for example, a case where thecenter lines - For example, in a case where washing of a human body is executed, water supplied from the
tank 80 passes through theoutflow port 82b and thefilter 114 as indicated by an arrow D9, and as water passes through thefilter 114, scale included therein is captured. Water having passed through thefilter 114 flows on thesecond flow passage 100, and subsequently, is discharged from thedischarge nozzle 41 through thepump 130. - Next, a case where water drainage for the
tank 80 is executed will be described with reference toFIG. 12B . As illustrated inFIG. 12B , themale screw 112a of thestrainer 110 is loosened with respect to thefemale screw 83b. Thereby, a part of theshaft 112 of thestrainer 110 moves out of thewater drain hole 83 to release engagement with thewater drain hole 83 and opens the sealedwater drain hole 83. As thewater drain hole 83 is opened, water in thetank 80 flows out through a gap between thestrainer 110 and thewater drain hole 83, as indicated by an arrow D10. - Herein, as mentioned above, setting is executed in such a manner that an inner diameter E1 of the
peripheral surface 120a of thecover 120 is greater than an outer diameter of theflange 111 b of thestrainer 110 and a distance E2 between the claws 120b1 is less than an outer diameter of theflange 111 b. - Therefore, a part of the
shaft 112 of thestrainer 110 moves out of thewater drain hole 83 but the remaining part of the shaft 112 (for example, a site with thefilter 114 formed thereon) or the like remains inserted in thewater drain hole 83. In other words, a part of thestrainer 110 remains inserted in thewater drain hole 83 and is in an idling state, even though engagement with thewater drain hole 83 is released. - The claw 120b1 of the
engagement part 120b of thecover 120 contacts, from an outside thereof, thehead 111 of thestrainer 110 with released engagement of themale screw 112a with thewater drain hole 83, at a position where thehead 111 seals theother end 120f. Thereby, water that flows out through thewater drain hole 83 is held back by theflange 111b, and hence, water that flows out through thetank 80 can be prevented from scattering from a side of theother end 120f as thestrainer 110 is removed from thewater drain hole 83. - The
strainer 110 is pushed by a water pressure from thewater drain hole 83 in a horizontal direction (accurately, a negative direction of an X-axis) to be pressed against and locked on the claws 120b1 of theengagement part 120b, and hence, water that flows out of thetank 80 can be further prevented from scattering. A part of theshaft 112 remains in thewater drain hole 83, and hence, thestrainer 110 does not shake even at time of water drainage. - The
opening 120c is disposed on a lower side of thecover 120, and hence, water that is held back by theflange 111 b flows through theopening 120c to exterior thereof. Thus, theopening 120c functions as a flow passage for flowing water discharged from thetank 80 through thewater drain hole 83. Water discharged from theopening 120c falls on theplate 31a, is guided to thedischarge hole 32 by the above-mentionedwater drainage channel 33, and is discharged into the bowl 12 (see an arrow D8 inFIG. 5 ). Thus, thewater drainage channel 33 is disposed on theplate 31a, so that water that flows out of thewater drain hole 83 can be discharged into thebowl 12 of thetoilet 10. - As mentioned above, the
flat part 112b is formed on theshaft 112 of thestrainer 110. Thereby, a gap is formed between thefemale screw 83b of thewater drain hole 83 and theflat part 112b. Therefore, as themale screw 112a is loosened to execute water drainage, water starts to flow out through such a gap, and as themale screw 112a is loosened, an amount of water that flows out of the gap is gradually increased. Thus, in the present embodiment, theflat part 112b is disposed on theshaft 112 of thestrainer 110, so that a flow rate of discharged water can be controlled. - A diameter of the
water drain hole 83 is set to be greater than a diameter of thesecond flow passage 100 or theoutflow port 82b. Thereby, comparatively large scale in thetank 80 can also be readily discharged to exterior thereof. As the above-mentioned water drainage is executed, thepump 130 is not driven, and hence, water in thetank 80 at time of water drainage does not flow to thesecond flow passage 100. - Thus, water drainage is executed by using the
strainer 110 attachable to and detachable from thetank 80, so that scale that accumulates in thetank 80 can readily be discharged to exterior thereof. - Next, a case where cleaning for removing scale captured by the
strainer 110 is executed after water drainage for thetank 80 is completed will be described with reference toFIG. 12C . - As illustrated in
FIG. 12C , thestrainer 110 is removed from thecover 120 in a case where cleaning of thestrainer 110 is executed. As thestrainer 110 is pulled in a horizontal direction (accurately, a negative direction of an X-axis) by a user, the claws 120b1 that locks theflange 111b is pushed out in an outer radial direction, and thestrainer 110 is pulled out of thecover 120 and removed from thewater drain hole 83 and thecover 120. - The
case 31 is provided with the above-mentioned taking-out hole 34 (seeFIG. 3 ), and hence, thestrainer 110 is taken out through the taking-outhole 34. Thus, thecase 31 is provided with the taking-outhole 34, so that thestrainer 110 can be removed from thetank 80 without removing the case cover 31 b or the like. - The
engagement part 120b that has been pushed out in an outer radial direction is restored due to elastic deformation thereof, after passing theflange 111b therethrough. Although illustration is omitted, as scale on thefilter 114 is removed to complete cleaning of thestrainer 110, thestrainer 110 is inserted into thecover 120 and thewater drain hole 83 while the sealingpart 113a of thecap 113 is a leading end thereof. Themale screw 112a is engaged with thefemale screw 83b of thewater drain hole 83, so that thestrainer 110 is installed in and fixed to thewater drain hole 83. - Next, positions where the
tank 80, thepump 130, and the like are disposed in an internal space of thecase 31 will be described in more detail.FIG. 13 is a cross-sectional view ofFIG. 5 along a line XIII - XIII. - As illustrated in
FIG. 13 , the case cover 31 b of thecase 31 includes arectangular part 36 and aslope part 37. Therectangular part 36 is positioned so as to cover a back side of theplate 31 a (a positive direction of a Y-axis). Therectangular part 36 is provided in such a manner that afront surface 36a and aback surface 36b extend in a vertical direction in an X-axis direction view that is a side view, and a rectangular or substantially rectangularinternal space 38 is formed. Thetank 80 is disposed in theinternal space 38. - The
slope part 37 is positioned so as to cover a front side of theplate 31 a (a negative direction of a Y-axis). Theslope part 37 is formed in such a manner that anupper surface 37a thereof is continuous with therectangular part 36. Theupper surface 37a of theslope part 37 is continuous with thefront surface 36a of therectangular part 36 on a side of a proximal end 37a1 thereof, and is sloped forward and downward so as to be directed downward on a side of a distal end 37a2 thereof. - In other words, the
bowl 12 of thetoilet 10 is disposed on a side of the distal end 37a2 as indicated by an imaginary line inFIG. 13 , and hence, the above-mentionedslope part 37 is formed in such a manner that theupper surface 37a is sloped downward on a side of thebowl 12 of thetoilet 10 in a side view. - The
slope part 37 configured as mentioned above is provided in such a manner that aninternal space 39 with a trapezoidal shape or a substantially trapezoidal shape is formed in a side view. Theinternal space 39 is comparative narrow and has a deformed shape, and hence, is frequently a dead space. However, the above-mentionedpump 130 is contained on a side of the distal end 37a2 of theslope part 37 in thesanitary washing apparatus 20 according to the present embodiment. Thereby, a dead space of thecase 31 can be utilized effectively. - In the configuration as mentioned above, the
pump 130 can be positioned under thetank 80. For example, thepump 130 may be disposed under theupper surface 37a closer to thebowl 12. Thereby, pipes disposed in thepump 130 are filled with water from thetank 80, and hence, even when thepump 130 is, for example, a non-self-priming pump, it is possible to start discharge of water early after activation thereof. - Next, a configuration of the
control part 200 illustrated inFIG. 2 will be described. Thecontrol part 200 includes astate detection unit 201, a watersupply control unit 202, and a heatingelement control unit 203. Thestate detection unit 201, the watersupply control unit 202, and the heatingelement control unit 203 as mentioned above are communicably connected to one another. - The
state detection unit 201 detects a seating state of a user, an operation instruction from a user, or a state of thetank 80. Thestate detection unit 201 detects seating of a user in a case where an ON signal is output from theseating sensor 210, while seat-leaving of a user in a case where an OFF signal is output therefrom. Thestate detection unit 201 detects a start instruction for starting washing of a human body or a stop instruction for stopping such washing that is output from theoperation part 220. - The
state detection unit 201 detects that a water level in thetank 80 is a predetermined level or higher in a case where an ON signal is output from thefloat switch 72. On the other hand, thestate detection unit 201 detects that a water level in thetank 80 is lower than a predetermined level in a case where an OFF signal is output from thefloat switch 72. Thestate detection unit 201 detects temperature of water in thetank 80 based on a signal that is output from thethermistor 73. - The water
supply control unit 202 controls operations of theelectromagnetic valve 62 and thepump 130 based on various states detected by thestate detection unit 201. Specifically, the watersupply control unit 202 operates theelectromagnetic valve 62 to supply water into thetank 80 and drive thepump 130 to discharge water in thetank 80 from thedischarge nozzle 41. - The heating
element control unit 203 operates theheating element 71 to heat water in thetank 80 in a case where temperature of water in thetank 80 that is detected by thestate detection unit 201 is lower than a reference temperature. On the other hand, the heatingelement control unit 203 stops an operation of theheating element 71 in a case where temperature of water in thetank 80 is higher than or equal to such a reference temperature. - Meanwhile, there is room for improvement in a conventional technique from the viewpoint of utilizing water, accurately hot water, in the
tank 80 effectively. In thesanitary washing apparatus 20 according to the embodiment, hot water in thetank 80 can be utilized as effectively as possible. Hereinafter, this matter will be described in detail. - Next, an operation of the
sanitary washing apparatus 20 configured as mentioned above will be described with reference toFIG. 14 or later.FIG. 14 is a timing chart that illustrates an example of steps of a process for thesanitary washing apparatus 20 according to the embodiment. -
FIG. 14 illustrates, sequentially from the top, an output signal of theseating sensor 210, a driving state of thepump 130, an output signal of thefloat switch 72, a cumulative drive time of thepump 130, an open or closed state of theelectromagnetic valve 62, an elapsed time after seat-leaving, and a float switch ON time. -
FIG. 15A to FIG. 15G are illustration diagrams that illustrate a state of water in thetank 80. Hereinafter, timing of supply of water into thetank 80 will be described with a focus and in detail. - In
FIG. 14 , first, as a user is seated at a time T1, thestate detection unit 201 detects an ON signal from theseating sensor 210. Then, as an instruction for starting washing is input by a user through theoperation part 220 at a time T2, the watersupply control part 202 drives thepump 130 to discharge water (hot water) in thetank 80 from thedischarge nozzle 41. - Thereby, as illustrated in
FIG. 15A , a water level in thetank 80 is gradually lowered. InFIG. 15A to FIG. 15G , hot water in thetank 80 is provided with a reference symbol HW and indicated by dots, and cold water is provided with a reference symbol CW and indicated by diagonal lines. Herein, hot water HW means water heated by theheating element 71 to have temperature around reference temperature, and cold water CW means water at temperature that has not yet reached such reference temperature, for example, immediately after water flows into thetank 80 through thewater inflow pipe 81. - The description for
FIG. 14 is continued, and as an output of thefloat switch 72 is switched from an ON signal to an OFF signal at a time T3 while water level in the above-mentionedtank 80 is lowered, the watersupply control unit 202 activates a timer that measures a cumulative pump drive time. - As such a cumulative pump drive time is greater than a first predetermined time A1, the water
supply control unit 202 opens theelectromagnetic valve 62 to start supply of water into thetank 80. Thereby, as illustrated inFIG. 15B , cold water CW starts to accumulate around a bottom of thetank 80. Herein, an amount of water supplied into thetank 80 is greater than an amount of water discharged from thedischarge nozzle 41. - The above-mentioned first predetermined time A1 is set depending on a performance of the
pump 130 or the like. Specifically, the first predetermined time A1 is set at, for example, a value such that supply of water is started before a water level in thetank 80 is lowered to expose theinlet 82a of thewater outflow pipe 82 above water. Thereby, water discharged from thedischarge nozzle 41 can be prevented from being depleted. - Subsequently, as a water level is elevated by supplying water into the
tank 80 and an output of thefloat switch 72 is switched from an OFF signal to an ON signal at a time T5, the watersupply control unit 202 closes theelectromagnetic valve 62 to stop supply of water (seeFIG. 15C ). - As washing of a user is continued, a water level in the
tank 80 is lowered again, and an output of thefloat switch 72 is switched from an ON signal to an OFF signal at a time T6. At such timing, the watersupply control unit 202 reactivates a timer that measures a cumulative pump drive time. - As a cumulative pump drive time is longer than the first predetermined time A1 at a time T7, the water
supply control unit 202 opens theelectromagnetic valve 62 to start supply of water into thetank 80, as illustrated inFIG. 15D . - Thus, in the present embodiment, supply of water is not started at timing when an output of the
float switch 72 is switched from an ON signal to an OFF signal, but is started in a case where a cumulative pump drive time is longer than the first predetermined time A1. Thereby, it is possible to delay timing when supply of water into thetank 80 is started, as much as possible, that is, supply of water can be started after hot water HW in thetank 80 is utilized as much as possible. - Subsequently, as, for example, an instruction for stopping washing is input by a user through the
operation part 220 at a time T8, the watersupply control unit 202 stops thepump 130 to stop discharge of water from thedischarge nozzle 41. The watersupply control unit 202 also closes theelectromagnetic valve 62 to stop supply of water into the tank 80 (seeFIG. 15E ). - Then, as a user leaves a seat at a time T9, the water
supply control part 202 measures an elapsed time after seat-leaving at timing when an output of theseating sensor 210 is switched from an ON signal to an OFF signal. Subsequently, as an elapsed time after seat-leaving is longer than a second predetermined time A2 at a time T10, the watersupply control unit 202 opens theelectromagnetic valve 62 to start supply of water into thetank 80. Such a second predetermined time A2 is settable at an arbitrary value, and for example, is set at a value of a few seconds to several tens of seconds. - Thus, in the present embodiment, supply of water into the
tank 80 is not started immediately after seat-leaving but such supply of water is started after a lapse of the second predetermined time A2. Thereby, hot water HW in thetank 80 can be utilized as effectively as possible. - That is, for example, as supply of water is started in a case where a user instantaneously leaves a seat to sit again or the like, a proportion of cold water CW to hot water HW in the
tank 80 may be increased to decrease an amount of available hot water HW consequently. On the other hand, in the present embodiment, supply of water is not started in a case of instantaneous seat-leaving, and hence, hot water HW in thetank 80 can be utilized as much as possible. - Subsequently, as a water level is elevated by supply of water into the
tank 80 and an output of thefloat switch 72 is switched from an OFF signal to an ON signal at a time T11, the watersupply control unit 202 activates a timer that measures a float switch ON time. The above-mentioned float switch ON time is a time after seat-leaving and when an output signal of thefloat switch 72 is an ON signal. That is, as illustrated inFIG. 15F , supply of water into thetank 80 is continued in the present embodiment even when an output of thefloat switch 72 is an ON signal. - As supply of water into the
tank 80 is thus continued, it is possible to dip a float of thefloat switch 72 in water, as illustrated inFIG. 15G . Thereby, drying of a float can be prevented. Although scale may be floated on a surface of water in thetank 80, a float is dipped in water so that the scale can be prevented from adhering to the float. - Then, as a float switch ON time is longer than a third predetermined time A3 at a time T12, the water
supply control unit 202 closes theelectromagnetic valve 62 to stop supply of water into thetank 80. Such a third predetermined time A3 is settable at an arbitrary value, and is set at, for example, a value of a few seconds to several tens of seconds. - Next, a variation of the
sanitary washing apparatus 20 according to the embodiment will be described. In the above-mentioned embodiment, theoutlet 81 b of thewater inflow pipe 81 is positioned closer to theheating element 71. As illustrated inFIG. 6 , thewater inflow pipe 81 is provided in such a manner that theoutlet 81 b is disposed above thecenter line 71 a of theheating element 71, and is not limited thereto. - In the
sanitary washing apparatus 20 according to a variation, thewater inflow pipe 81 is provided in such a manner that anoutlet 181b thereof is disposed at a position lower than that of theheating element 71, as indicated by an imaginary line inFIG. 6 . Specifically, thewater inflow pipe 81 is provided in such a manner that theoutlet 181 b is disposed under thecenter line 71 a of theheating element 71. Thereby, in the variation, water supplied from thewater inflow pipe 81 to thetank 80 readily stays around theheating element 71, and hence, it is possible to heat water more efficiently. - As described above, the
sanitary washing apparatus 20 according to the embodiment includes thetank 80, thedischarge nozzle 41, and thebackflow prevention mechanism 90. Thetank 80 is provided with a heating element inside thereof and stores water therein. Thedischarge nozzle 41 dischrages water in thetank 80 toward a private part of a user. Thebackflow prevention mechanism 90 has theair gap 94 disposed on an upstream side of thetank 80 and at the site B where a flow passage is divided by the atmosphereopen space 94. - The
backflow prevention mechanism 90 includes thespout port 91, the water-receivingport 92, and thewater drain port 93. Thespout port 91 is disposed at theend 60a of thefirst flow passage 60 communicating with the water supply pipe A and spouts water in a horizontal direction. The water-receivingport 92 is disposed to be opposed to thespout port 91 through the atmosphereopen space 94, receives water spouted from thespout port 91, and serves as theinflow port 81 a of thetank 80. Thewater drain port 93 drains water remaining in thespace 94. - Thus, the
backflow prevention mechanism 90 is a horizontal type and the water-receivingport 92 of thebackflow prevention mechanism 90 serves as theinflow port 81 a of thetank 80, so that thesanitary washing apparatus 20 can be downsized. - In the above-mentioned embodiment, supply of water into the
tank 80 is started after an output of thefloat switch 72 is switched from an ON signal to an OFF signal and subsequently the first predetermined time A1 is elapsed, and is not limited thereto. That is, for example, supply of water into thetank 80 may be started at a time when an output of thefloat switch 72 is switched from an ON signal to an OFF signal. - In the above, supply of water into the
tank 80 is started after the second predetermined time A2 is elapsed after seat-leaving of a user, and is not limited thereto, and supply of water may be started, for example, immediately after seat-leaving. - In the above, supply of water into the
tank 80 is stopped after a user leaves a seat and after a time when an output of thefloat switch 72 is an ON signal passes through the third predetermined time A3, and is not limited thereto. That is, for example, supply of water into thetank 80 may be stopped at a time when thefloat switch 72 outputs an ON signal after a user leaves a seat.
Claims (6)
- A sanitary washing apparatus (20), comprising:a nozzle (41) that is configured to discharge water toward a private part of a user;a water passage (50) that is configured to communicate with the nozzle (41) and a water supply pipe (A);a tank (80) that is disposed on the water passage (50), the tank (80) being provided with a heating element (71) inside thereof and configured to store water therein, the tank (80) being configured to supply water to the nozzle (41); anda backflow prevention mechanism (90) that is disposed on the water passage (50) and upstream of the tank (80), whereinthe water passage (50) includes a first water passage (60) that connects the water supply pipe (A) and the backflow prevention mechanism (90), and a second water passage (100) that connects the tank (80) and the nozzle (41), andwhereinthe backflow prevention mechanism (90) includesan air gap (94a) communicating with an atmosphere, thereby preventing backflow of water,a water spout port (91) that is disposed at an end (60a) of the first water passage (60) and spouts water in a horizontal direction,a water-receiving port (92) that is disposed to be opposed to the water spout port (91) through the air gap (94a), the water-receiving port (92) being configured to receive water from the water spout port (91), and serve as an inlet port (81 a) of the tank (80), anda water drain port (93) that is configured to discharge water remaining in the air gap (94a) outside of the backflow prevention mechanism (90).
- The sanitary washing apparatus (20) according to claim 1, comprising a case (31) that houses the tank (80), the nozzle (41), and the backflow prevention mechanism (90), wherein
the nozzle (41) is disposed at a central portion (31 c) of the case (31),
the tank (80) is disposed side by side with the nozzle (41) and includes a water drain channel (85) communicating with the water drain port (93), a part of a wall (80a) of the tank (80) constituting a part of the water drain channel (85), and
the water drain port (93) and the water drain channel (85) are disposed at positions closer to the nozzle (41) in the tank (80). - The sanitary washing apparatus (20) according to claim 2, wherein the water drain port (93) and the water drain channel (85) are configured such that the part of the wall (80a) of the tank (80) is dented toward an inside of the tank (80).
- The sanitary washing apparatus (20) according to claim 2 or 3, wherein
the tank (80) includes a water inflow pipe (81) that communicates with the water-receiving port (92) and a part of the water inflow pipe (81) is constituted by the part of the wall (80a) of the tank (80), and
the water drain channel (85) is disposed outside the tank (80) and adjacent to the water inflow pipe (81) with the part of the wall (80a) of the tank (80) being disposed between the water drain channel (85) and the water inflow pipe (81). - The sanitary washing apparatus (20) according to claim 2, 3, or 4, comprising:a pump (130) that is disposed downstream of the tank (80) and supplies water stored in the tank (80) to the nozzle (41), whereinthe case (31) includes a top surface (37a) that is downwardly sloped in a direction of a bowl (12) and the pump (130) is disposed under the top surface (37a) closer to the bowl (12).
- The sanitary washing apparatus (20) according to any one of claims 1 to 5, wherein the tank (80) includes a part (84) that changes a direction of water flow downwardly after water spouts from the water spout port (91) and passes though the water-receiving port (92).
Applications Claiming Priority (1)
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JP2015115182A JP6596944B2 (en) | 2015-06-05 | 2015-06-05 | Sanitary washing device |
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EP3101185A1 true EP3101185A1 (en) | 2016-12-07 |
EP3101185B1 EP3101185B1 (en) | 2017-12-13 |
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EP16172920.7A Active EP3101185B1 (en) | 2015-06-05 | 2016-06-03 | Sanitary washing apparatus |
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EP3434838B1 (en) | 2017-07-25 | 2020-01-08 | Toto Ltd. | Sanitary cleaning device |
CN112177119A (en) * | 2019-07-05 | 2021-01-05 | Toto株式会社 | Sanitary washing device |
CN112177122A (en) * | 2019-07-05 | 2021-01-05 | Toto株式会社 | Sanitary washing device |
CN112177121A (en) * | 2019-07-05 | 2021-01-05 | Toto株式会社 | Sanitary washing device |
CN112177118A (en) * | 2019-07-05 | 2021-01-05 | Toto株式会社 | Sanitary washing device |
EP3760799A1 (en) * | 2019-07-05 | 2021-01-06 | Toto Ltd. | Sanitary washing device |
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JP7414579B2 (en) | 2020-02-26 | 2024-01-16 | 株式会社Lixil | base plate, toilet device |
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EP3434838B1 (en) | 2017-07-25 | 2020-01-08 | Toto Ltd. | Sanitary cleaning device |
CN112177119A (en) * | 2019-07-05 | 2021-01-05 | Toto株式会社 | Sanitary washing device |
CN112177122A (en) * | 2019-07-05 | 2021-01-05 | Toto株式会社 | Sanitary washing device |
CN112177121A (en) * | 2019-07-05 | 2021-01-05 | Toto株式会社 | Sanitary washing device |
CN112177118A (en) * | 2019-07-05 | 2021-01-05 | Toto株式会社 | Sanitary washing device |
EP3760797A1 (en) * | 2019-07-05 | 2021-01-06 | Toto Ltd. | Sanitary washing device |
EP3760799A1 (en) * | 2019-07-05 | 2021-01-06 | Toto Ltd. | Sanitary washing device |
EP3760798A1 (en) * | 2019-07-05 | 2021-01-06 | Toto Ltd. | Sanitary washing device |
US11214951B2 (en) | 2019-07-05 | 2022-01-04 | Toto Ltd. | Sanitary washing device |
CN112177121B (en) * | 2019-07-05 | 2022-04-05 | Toto株式会社 | Sanitary washing device |
CN112177119B (en) * | 2019-07-05 | 2022-07-05 | Toto株式会社 | Sanitary washing device |
CN112177118B (en) * | 2019-07-05 | 2022-08-16 | Toto株式会社 | Sanitary washing device |
US11591784B2 (en) | 2019-07-05 | 2023-02-28 | Toto Ltd. | Sanitary washing device |
US11668084B2 (en) | 2019-07-05 | 2023-06-06 | Toto Ltd. | Sanitary washing device |
Also Published As
Publication number | Publication date |
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JP6596944B2 (en) | 2019-10-30 |
EP3101185B1 (en) | 2017-12-13 |
JP2017002502A (en) | 2017-01-05 |
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