JP2019199789A - Sanitary washing device - Google Patents

Abstract

To provide a sanitary washing device capable of improving maintainability.SOLUTION: A sanitary washing device includes: a base plate; an atmosphere opening type tank provided on the base plate and for storing water; a water discharge nozzle for discharging water stored in the tank toward a private part of a user; and a drain part provided on the base plate and for discharging surplus water in the tank. The tank includes: a tank body; an inflow part for flowing water in the bank body; an outflow part for flowing out the water in the tank to the water discharge nozzle; and an overflow port provided so as to form an air gap between itself and the inflow port and for flowing out the surplus water to the drain part. The drain part has a flow passage which is connected to the overflow port and where the surplus water flows. The drain part is a separate body from the tank and is also a separate body from the base plate.SELECTED DRAWING: Figure 6B

Description

  The disclosed embodiments relate to a sanitary washing device.

  2. Description of the Related Art Conventionally, a sanitary washing device is known that is disposed on an upper part of a Western-style toilet body and cleans a human body part with discharged water. The sanitary washing device is configured, for example, to store water supplied from a water supply source such as a water pipe in a tank and to discharge the stored water from a water discharge nozzle to a human body part.

  In the sanitary washing apparatus, an air gap may be formed in the flow path from the water supply source to the water discharge nozzle in order to prevent dirty water from flowing back through the flow path and contaminating the water supply source (for example, patents). Reference 1). The air gap is a space that divides the flow path from the water supply source to the water discharge nozzle, and is formed in, for example, a tank.

  The tank is an open-type tank whose upper part is opened, and has an overflow port for discharging, for example, excess water from the tank in order to prevent water from overflowing from the upper part. In addition, on the base plate on which the parts including the tank are provided, a drainage channel that is connected to the overflow port and through which excess water flows is provided integrally with the base plate, for example.

JP 2014-190000 A

  By the way, it is necessary to remove the scale of the drainage channel described above in order to prevent, for example, blockage due to the scale.

  However, since conventional drainage channels are integrated with the base plate, the conventional sanitary washing device requires maintenance to remove parts around the drainage channel on the baseplate when removing the scale. There was room for improvement in the improvement of sex.

  An object of one embodiment is to provide a sanitary washing device that can improve maintainability.

  A sanitary washing device according to one aspect of an embodiment is provided on a base plate, an open-air tank that stores water, and discharges water stored in the tank toward a local area of a user. A water discharge nozzle, and a drainage unit that is provided on the base plate and discharges excess water from the tank. The tank includes a tank body, an inflow port for allowing water to flow into the tank body, and an inside of the tank body. An outlet that allows the water to flow out to the water discharge nozzle, and an overflow port that is provided so as to form an air gap between the inlet and the outlet. Has a flow path that is connected to the overflow port and through which the excess water flows, and is separate from the tank and separate from the base plate. To.

  According to this configuration, the drainage part can be configured to be detachable, and only the drainage part can be taken out. Thereby, for example, when the scale generated in the drainage part is removed, the workability can be easily improved.

  Further, the drainage part is characterized in that an upper part of the flow path is opened.

  According to such a configuration, even when surplus water in an amount exceeding the drainage capacity of the drainage part flows, the surplus water overflows from the flow path having an open top, thereby preventing the backflow of surplus water. Thereby, the overflow from the tank main body by the backflow of excess water can be prevented.

  Further, the drainage section is characterized in that the flow passage cross-sectional area of the flow passage is equal to or larger than the flow passage cross-sectional area of the overflow port.

  According to such a configuration, since the cross section of the flow path of the drainage portion does not become narrower than the overflow port, the drainage rate of excess water from the overflow port cannot exceed the drainage rate of the drainage unit. This prevents the backflow of excess water. Thereby, the overflow from the tank main body by the backflow of excess water can be prevented.

  In addition, the drainage part has an enlarged part in which a channel cross-sectional area is enlarged in at least a part of the channel.

  According to such a configuration, it is possible to reduce the flow rate of surplus water in the enlarged portion where the cross-sectional area of the flow passage is enlarged, and, similarly to the above, the drainage rate of the drainage portion cannot catch up with the drainage speed of the surplus water from the overflow port. It is possible to prevent excess water from flowing back by preventing the capacity from being exceeded. Thereby, the overflow from the tank main body by the backflow of excess water can be prevented.

  Further, the drainage part has a curved part that is curved in at least a part of the flow path.

  According to such a configuration, the drainage portion can be arranged while avoiding other members arranged on the base plate, and space efficiency can be improved. Moreover, the flow rate of surplus water can be reduced by causing pressure loss in the curved portion, and the surplus water is prevented from exceeding the drainage capacity of the drainage portion, such as the drainage rate of surplus water from the overflow port cannot catch up, as described above. Water backflow can be prevented. Thereby, the overflow from the tank main body by the backflow of excess water can be prevented.

  The enlarged portion is provided on the upstream side of the bending portion.

  According to this configuration, the surplus water flow rate can be reduced at the enlarged portion before the surplus water reaches the curved portion. Thereby, it can suppress that surplus water splashes out of the flow path of a drainage part.

  Moreover, the said drainage part has the wall part which faces the flow direction of the said surplus water in the upstream of the said curved part, It is characterized by the above-mentioned.

  According to such a configuration, it is possible to reduce the flow rate of surplus water by colliding with the wall portion before surplus water reaches the curved portion. Thereby, it can suppress that surplus water splashes out of the flow path of a drainage part.

  Further, a cover attached to the base plate and covering the upper side of the base plate is provided, and the cover presses the drainage portion from above in a state of being attached to the base plate.

  According to such a configuration, since the drainage unit is pressed against the base plate and fixed on the base plate, rattling of the drainage unit and, for example, wobbling of the drainage unit due to contact with the user's finger can be suppressed.

  According to one aspect of the embodiment, maintainability can be improved.

Drawing 1 is a perspective view showing a toilet device provided with a sanitary washing device concerning an embodiment. FIG. 2 is an explanatory diagram illustrating an example of a configuration of a sanitary washing device including a nozzle unit and a water supply unit. FIG. 3 is an explanatory diagram of the inside of the tank. FIG. 4A is a perspective view (No. 1) showing a base plate. FIG. 4B is a perspective view (part 2) illustrating the base plate. FIG. 5 is a perspective view showing the overflow port. FIG. 6A is a perspective view illustrating a state in which a drainage unit is attached. FIG. 6B is a perspective view showing a state in which the drainage portion is removed. FIG. 7A is a plan view showing a drainage section and a flow path. FIG. 7B is an enlarged view of a portion A in FIG. 7A. FIG. 8 is a side sectional view showing a fixing structure of the drainage part.

  Hereinafter, embodiments of a sanitary washing device disclosed in the present application will be described in detail with reference to the accompanying drawings. In addition, this invention is not limited by embodiment shown below.

<1. Configuration of sanitary washing device>
Drawing 1 is a perspective view showing toilet device 1 provided with sanitary washing device 20 concerning an embodiment. In FIG. 1, for easy understanding, a three-dimensional orthogonal coordinate system in which the X-axis direction, the Y-axis direction, and the Z-axis direction that are orthogonal to each other are defined and the Z-axis positive direction is the vertical upward direction is shown. It is shown. Such an orthogonal coordinate system may also be shown in other drawings used in the following description. Further, FIG. 1 and FIG. 2 and subsequent figures which will be described later are both schematic views.

  As shown in FIG. 1, a toilet device 1 includes a Western-style toilet (hereinafter referred to as “toilet”) 10 and a sanitary washing device 20 and is installed in a toilet room. The toilet bowl 10 is a low tank type that performs washing with water stored in the water storage tank 11, but is not limited thereto, and may be a flush valve type, for example. In the example shown in FIG. 1, the floor-standing toilet 10 is shown, but the toilet bowl 10 is not limited to this, and may be a wall-mounted type.

  The sanitary washing device 20 is provided in the upper part of the toilet 10, and discharges water to a user's body, and wash | cleans a local part. In the present specification, the expression “water” is not necessarily a meaning of cold water but may be used to mean including hot water.

  Specifically, the sanitary washing device 20 includes a main body portion 30, a toilet lid 300, and a toilet seat (not shown). Both the toilet lid 300 and the toilet seat are attached to the main body 30 so that they can be opened and closed.

  The main body 30 includes a case 31, a nozzle unit 40, and a water supply unit 50. The case 31 houses the nozzle unit 40, the water supply unit 50, and the like.

  FIG. 2 is an explanatory diagram illustrating an example of the configuration of the sanitary washing device 20 including the nozzle unit 40 and the water supply unit 50.

  As shown in FIG. 2, the sanitary washing device 20 includes a control unit 200, a seating sensor 210, and an operation unit 220 in addition to the nozzle unit 40 and the water supply unit 50. The control unit 200 and the seating sensor 210 described above are provided in the main body unit 30, for example.

  The nozzle unit 40 includes a water discharge nozzle 41. For example, the water discharge nozzle 41 has a water discharge hole 42 at the tip, and can discharge water from the water discharge hole 42 to a local area of the user. Further, the water discharge nozzle 41 is configured to be able to advance and retreat with respect to the case 31 (see FIG. 1). Specifically, for example, a drive source such as a motor (not shown) is connected to the water discharge nozzle 41. The water discharge nozzle 41 is moved forward and backward between a position where the water supply nozzle 41 is advanced into the bowl 12 of the toilet bowl 10 and a position where the water discharge nozzle 41 is retracted and stored in the case 31. In addition, the water discharge nozzle 41 discharges water to a user's body in the advanced position, and wash | cleans a local part.

  The water supply unit 50 is connected to a water supply source 5 such as a water pipe, and supplies water from the water supply source 5 to the nozzle unit 40. Specifically, the water supply unit 50 includes a stop cock 51, a water supply valve unit 52, a tank 60, a pump 110, and a heat exchanger 120.

  In the following, among the flow paths from the water supply source 5 to the nozzle unit 40, the flow path from the water supply source 5 to the tank 60 is referred to as the “first flow path 50a”, and the flow path from the tank 60 to the heat exchanger 120 is referred to. The “second flow path 50b” and the flow path from the heat exchanger 120 to the nozzle unit 40 may be referred to as “third flow path 50c”.

  A stop cock 51 and a water supply valve unit 52 are provided in the first flow path 50a in order from the upstream side. The stop cock 51 is an instrument for stopping the supply of water from the water supply source 5 to the first flow path 50a according to a manual operation, but is normally in an opened state.

  The water supply valve unit 52 includes a check valve 52a, a strainer 52b, a constant flow valve 52c, and an electromagnetic valve 52d in order from the upstream side. The check valve 52 a prevents the backflow of water supplied from the water supply source 5 through the stop cock 51. The strainer 52b removes foreign matters such as dust mixed in the water supplied from the water supply source 5. The constant flow valve 52c adjusts the water flowing in from the water supply source 5 to a predetermined flow rate or less and flows it out. The electromagnetic valve 52d is, for example, a normally closed valve that is in a closed state when not energized, and opens and closes the first flow path 50a in accordance with a control signal from the control unit 200.

  The tank 60 stores water supplied from the water supply source 5 via the first flow path 50a. The tank 60 includes an inlet 62 (see FIG. 3), which will be described later, provided above a tank body 61 (see FIG. 3) which will be described later. For example, the inflow port 62 discharges water from the water supply source 5 in the vertical direction and allows the water to flow into the tank body 61. The water stored in the tank 60 is supplied to the water discharge nozzle 41 of the nozzle unit 40.

  In this specification, terms such as “vertical” and “horizontal” are used, but these do not necessarily require exact mathematical precision, and are allowed for substantial tolerances and errors. Is.

  Further, a water level detection sensor 100 that detects the water level of water stored in the tank 60 is disposed in the tank 60. The tank 60 is, for example, a so-called atmospheric open tank (also referred to as “open tank”) in which an upper portion of the tank body 61 (see FIG. 3) is opened.

  Here, the inside of the tank 60 will be described with reference to FIG. FIG. 3 is an explanatory diagram of the inside of the tank 60. As shown in FIG. 3, the tank 60 includes a tank body 61, an inflow port 62, an outflow port 63, and an overflow port 64. The inlet 62 is provided above the tank body 61 as described above. The inflow port 62 allows the water W <b> 1 of the water supply unit 50 (see FIG. 2) to flow into the tank body 61.

  The outlet 63 is provided in the lower part of the tank body 61. The outlet 63 allows the water W2 to flow out from the tank body 61 toward the water discharge nozzle 41 (see FIG. 2). The overflow port 64 is provided so as to form an air gap between the tank body 61 and the inflow port 62. The overflow port 64 is, for example, provided below the inflow port 62 and in the vicinity of the upper portion of the tank body 61, and the excess water W3 is inclined downward from the tank body 61 toward the downstream side (toilet bowl 10 side). It flows out to the flow path 71 of the drainage part 70 which is. The overflow port 64 will be described later with reference to FIG.

  In addition, since the tank 60 includes the inlet 62 and the overflow port 64 as described above, the water level in the tank body 61 does not rise above the overflow port 64, and the tank 60 is located between the inlet 62 and the water surface WS. An air gap (space) is formed. That is, the flow path from the water supply source 5 to the water discharge nozzle 41 (both see FIG. 2) is divided by the air gap.

  As described above, the air gap is formed in the tank 60, so that, for example, even when a negative pressure is generated in the flow path from the water supply source 5 to the water discharge nozzle 41, the sewage flows from the tank 60 to the first flow path. It is possible to prevent the water supply source 5 from being contaminated by flowing backward through 50a (see FIG. 2).

  Returning to FIG. 2, the description of the configuration of the sanitary washing device 20 is continued. As shown in FIG. 2, the pump 110 is provided in the second flow path 50b. The pump 110 is driven in accordance with a control signal from the control unit 200, and supplies water stored in the tank 60 and flowing out from the outlet 63 to the water discharge nozzle 41 via the heat exchanger 120.

  The heat exchanger 120 can heat the water supplied to the water discharge nozzle 41. For example, the heat exchanger 120 includes a heating element 121 and a heat exchanger water level detection sensor 122.

  The heating element 121 is disposed in the heat exchanger 120, energized by a control signal from the control unit 200, generates heat, and heats water passing through the heat exchanger 120. For example, a sheathed heater can be used as the heating element 121, but is not limited thereto, and other types of heating devices such as a ceramic heater may be used.

  The heat exchanger water level detection sensor 122 is disposed at a predetermined position of the heat exchanger 120, and outputs a predetermined signal when the water level in the heat exchanger 120 rises above a predetermined position. In addition, although the float switch (float sensor) can be used as the water level detection sensor 122 for heat exchangers, it is not limited to this.

  In the heat exchanger 120, water is heated by the heating element 121 to generate hot water, and the generated hot water is supplied to the nozzle unit 40 through the third flow path 50c, and the user's body (local part). Is discharged.

  The seating sensor 210 is provided at an appropriate position of the case 31 (see FIG. 1), for example, and detects that the user is sitting on the toilet seat. When seating is detected, the seating sensor 210 outputs a signal indicating the seating. As the seating sensor 210, for example, a light emitting / receiving type distance sensor can be used.

  The seating sensor 210 is not limited to the distance sensor described above, and other types of sensors such as a load sensor that detects a user's load acting on the toilet seat may be used. Moreover, the seating sensor 210 does not necessarily need to be provided in the case 31, and may be provided, for example, on the wall surface of a toilet room.

  The operation unit 220 includes an operation button, an operation knob, and the like to which a user inputs a cleaning start instruction for starting cleaning of the human body part and a cleaning stop instruction for stopping cleaning, and is provided at an appropriate position in the toilet room. The operation unit 220 outputs a signal indicating a cleaning start instruction or the like input from the user via an operation button or the like. For example, a remote controller can be used as the operation unit 220, but the operation unit 220 is not limited to this, and may be provided in the main body unit 30.

  Various signals output from the water level detection sensor 100, the heat exchanger water level detection sensor 122, the seating sensor 210, and the operation unit 220 are input to the control unit 200. The control unit 200 controls the sanitary washing device 20 as a whole, and includes, for example, an arithmetic processing device (not shown) such as a CPU (Central Processing Unit) and a storage device (not shown) such as a RAM (Random Access Memory).

  The control unit 200 can perform processing for controlling the electromagnetic valve 52d, the pump 110, the heating element 121, the nozzle unit 40, and the like based on various types of input signals.

  For example, the control unit 200 controls the electromagnetic valve 52d and the pump 110 based on signals input from the water level detection sensor 100, the seating sensor 210, and the operation unit 220.

  In addition, the control unit 200 can control energization to the heating element 121 based on a predetermined signal input from the heat exchanger water level detection sensor 122. For example, when a predetermined signal is input from the heat exchanger water level detection sensor 122, the control unit 200 energizes the heating element 121, while when the predetermined signal is not input, in other words, in the heat exchanger 120. When the water level is less than or equal to the predetermined position, energization to the heating element 121 can be stopped. Thereby, it is possible to prevent air heating in the heat exchanger 120.

  Next, the case 31 (base plate 32 and cover 33) will be described with reference to FIGS. 4A and 4B. 4A and 4B are perspective views showing the base plate 32 (and the cover 33). 4A and 4B show a state where the tank 60 and the drainage unit 70 are provided on the base plate 32. FIG. As shown in FIG. 4A, the case 31 includes a base plate 32 and a cover 33.

  As shown in FIGS. 4A and 4B, the base plate 32 is configured to be splittable in the front-rear direction (Y-axis direction), and includes a front plate 32a and a rear plate 32b. On the front plate 32a, a drainage unit 70 for discharging the excess water of the tank 60 into the bowl 12 of the toilet bowl 10 is provided. Excess water in the tank 60 flows through the flow path 71 of the drainage unit 70 and flows into the bowl 12 of the toilet 10 from the drainage port 72 (see FIG. 4A). In addition, the drainage part 70 is later mentioned using FIG. 6A-FIG. 7B.

  A tank 60 is provided on the rear plate 32b. The front plate 32a and the rear plate 32b are configured to be separable in a state where the drainage unit 70 is provided and a state where the tank 60 is provided. That is, the drainage part 70 provided in the front plate 32a and the tank 60 provided in the rear plate 32b are formed separately, and when the drainage part 70 is attached, the rear end part of the flow path 71 of the drainage part 70 is Connected to the overflow port 64 of the tank 60.

  Here, the overflow port 64 will be described with reference to FIG. FIG. 5 is a perspective view showing the overflow port 64. As shown in FIG. 5, the overflow port 64 is provided on the front surface 61 a that is the surface of the tank body 61 in the negative Y-axis direction. The overflow port 64 is a space formed by the bottom plate 64a protruding from the front surface 61a of the tank body 61 and the pair of side plates 64b, and has a predetermined flow path cross-sectional area. In addition, the flow path cross-sectional area in this case is the opening area of the overflow port 64, and is the area of the XZ cross section at the overflow port 64.

  Returning to FIG. 4A, the description of the case 31 will be continued. As shown in FIG. 4A, the cover 33 is attached to the base plate 32 in a state where the front plate 32a and the rear plate 32b are connected. The cover 33 covers the upper side of the base plate 32.

<2. Drainage section>
Next, the drainage part 70 is demonstrated with reference to FIG. 6A-FIG. 7B. FIG. 6A is a perspective view illustrating a state in which the drainage unit 70 is attached. FIG. 6B is a perspective view showing a state in which the drainage unit 70 is removed. The drainage unit 70 is a separate body from the tank 60 as described above. Further, the drainage part 70 is formed separately from the front plate 32a.

  Here, when the water is stably supplied to the tank 60 (see FIG. 3), the surplus water W3 (see FIG. 3) does not flow into the flow path 71 of the drainage unit 70. If the surplus water W3 frequently flows due to the above, scale is generated by repeating the wetting and drying. When the channel 71 is blocked by the scale, the drainage capacity of the drainage unit 70 is reduced, and thus the scale needs to be removed from the channel 71.

  In the present embodiment, the drainage unit 70 is a separate body with respect to the tank 60 and a separate body with respect to the front plate 32a, so that it is detachable and only the drainage unit 70 can be taken out. Thereby, for example, when the scale generated in the drainage part 70 is removed, the workability can be improved, and the maintainability can be improved.

  The drainage unit 70 includes a receiving unit 73. The receiving part 73 positions the drainage part 70 on the front plate 32a by engaging with the protrusion 34 provided on the front plate 32a. In this embodiment, the drainage part 70 is provided with the receiving part 73 and the front plate 32a is provided with the protrusion 34. For example, the drainage part 70 is provided with a protrusion and the front plate 32a is provided with the receiving part. May be. Moreover, it is preferable that the receiving part 73 and the protrusion part 34 are each provided in multiple places. Thereby, positioning of the drainage part 70 can be performed reliably.

  Next, the flow path 71 of the drainage unit 70 will be described with reference to FIGS. 7A and 7B. FIG. 7A is a plan view showing the drainage section 70 and the flow path 71. FIG. 7B is an enlarged view of a portion A in FIG. 7A. As shown in FIG. 7A, the surplus water W3 that has flowed out of the overflow port 64 flows through the flow path 71 of the drainage unit 70 and is discharged from the drainage port 72 into the bowl 12 of the toilet 10 (see FIG. 2). As shown in FIG. 7B, the flow path 71 is formed by a bottom plate 71a and a pair of side plates 71b, and an upper portion is opened. In addition, in the flow path 71, the structure where a part upper part of the flow path 71 is open | released and the other part is obstruct | occluded may be sufficient.

  According to the sanitary washing device 20 according to the above-described embodiment, the upper part of the flow path 71 is opened, so that the upper part is opened even when an amount of excess water W3 exceeding the drainage capacity of the drainage unit 70 flows. Since the excess water W3 overflows from the flow path 71, the backflow of the excess water W3 can be prevented. Thereby, the overflow from the open part of the tank main body 61 (refer FIG. 3) by the backflow of the excess water W3 can be prevented.

  Further, the channel cross-sectional area of the channel 71 is equal to or larger than the channel cross-sectional area of the overflow port 64 (see FIG. 5). That is, the channel 71 is formed so that the channel cross-sectional area of any part of the channel 71 is equal to or larger than the channel cross-sectional area of the overflow port 64. In addition, the flow path cross-sectional area in this case is a cross-sectional area of a surface in the flow path 71 that is orthogonal to the flow direction of the excess water W3.

  Since the channel cross-sectional area of the channel 71 is equal to or larger than the channel cross-sectional area of the overflow port 64, the channel cross-section of the channel 71 does not become narrower than the overflow port 64. For this reason, it is possible to prevent the excess water W3 from flowing backward by preventing the drainage speed of the excess water W3 from the overflow port 64 from exceeding the drainage capacity of the drainage unit 70, for example. Thereby, the overflow from the open part of the tank main body 61 by the reverse flow of the excess water W3 can be prevented.

  As shown in FIG. 7B, the drainage part 70 includes an enlarged part 711, a curved part 712, and a wall part 713 in the flow path 71. The enlarged portion 711 is a portion where the flow path cross-sectional area of the flow path 71 is enlarged in at least a part of the flow path 71.

  By providing the enlarged portion 711 in the flow path 71, the flow rate of the excess water W3 can be reduced in the enlarged portion 711, and the drainage speed of the excess water W3 from the overflow port 64 cannot catch up. It is possible to prevent the excess water W3 from flowing back. Thereby, the overflow from the open part of the tank main body 61 by the reverse flow of the excess water W3 can be prevented.

  The curved portion 712 is a portion that is curved in at least a part of the flow path 71. For example, the bending portion 712 is bent (bent) in a bowl shape in a plan view. Note that the bending portion 712 may be formed by a plurality of times of bending. That is, the curved portion 712 may be formed in a crank shape or an S shape in plan view.

  By providing the curved portion 712 in the flow path 71, the drainage portion 70 can be disposed while avoiding other members disposed on the front plate 32a, and space efficiency can be enhanced. Further, the pressure loss at the curved portion 712 can reduce the flow rate of the surplus water W3, and the drainage speed of the surplus water W3 from the overflow port 64 cannot be caught up. Therefore, the backflow of excess water can be prevented. Thereby, the overflow from the tank main body 61 by the reverse flow of the excess water W3 can be prevented.

  The wall portion 713 is provided so as to face the flow direction (for example, the Y-axis direction) of the excess water W3 flowing through the flow path 71. The wall portion 713 is provided on the upstream side of the bending portion 712.

  By providing the wall portion 713 in the flow path 71, the surplus water W3 collides with the wall portion 713 before reaching the curved portion 712, so that the flow rate of the surplus water W3 can be reduced. Thereby, it can suppress that the surplus water W3 splashes out of the flow path 71 from the upper part by which the flow path 71 was open | released.

  The enlarged portion 711 is provided on the upstream side of the bending portion 712. Thereby, before the surplus water W3 reaches | attains the curved part 712, the flow rate of the surplus water W3 can be reduced by the expansion part 711, and the surplus water W3 is the flow path 71 from the open | release upper part of the flow path 71 like the above. It is possible to suppress scattering to the outside. Note that the enlarged portion 711 is preferably provided on the upstream side of the bending portion 712 and immediately before the bending portion 712. Further, the wall portion 713 is preferably provided in the enlarged portion 711.

  Further, the enlarged portion 711, the curved portion 712, and the wall portion 713 are preferably provided on the upstream side of the flow channel 71, specifically, immediately after the overflow port 64. Thereby, before the flow rate of the surplus water W3 from the overflow port 64 increases, the flow rate of the surplus water W3 can be reduced, so that the splash of the surplus water W3 when the flow rate is reduced can be suppressed.

  Moreover, the flow path 71 of the drainage part 70 is formed so that it may become the direction similar to the extending | stretching direction of the water discharge nozzle 41 (refer FIG. 2). Thereby, the length of the flow path 71 between the tank 60 and the toilet bowl 10 can be suppressed as much as possible.

  In addition, in the drainage part 70 mentioned above, it is set as the structure by which the upper part of the flow path 71 was open | released, For example, you may attach or detach with respect to the drainage part 70, and you may provide the cover part which covers the flow path 71. Thereby, scattering of the surplus water W3 to the outside of the flow path 71 can be prevented. In this case, by configuring the lid portion to open with the flow pressure of the surplus water W3, the surplus water W3 can overflow and the backflow of the surplus water W3 can be prevented.

  Further, as shown in FIG. 7B, the drainage part 70 includes a contact part 74. The contact portion 74 is provided at the front end portion of the drainage portion 70. The contact part 74 is provided so as to span between one and the other of the pair of side plates 71b. The contact portion 74 forms a fixing structure of the drainage portion 70 described later.

<3. Drainage fixing structure>
Next, the fixing structure of the drainage unit 70 will be described with reference to FIG. FIG. 8 is a side sectional view showing a fixing structure of the drainage unit 70. As shown in FIG. 8, the front plate 32 a of the base plate 32 (see FIG. 4A) includes an engagement hook 35. The engagement hook 35 is provided at the rear end portion of the front plate 32a, and engages the rear end portion of the drainage portion 70, thereby fixing the rear portion of the drainage portion 70 on the front plate 32a.

  The cover 33 of the case 31 includes a pressing portion 36. The pressing portion 36 is provided at the front end portion of the inner surface of the cover 33. The pressing portion 36 presses the contact portion 74 of the drainage portion 70 from above in a state where the cover 33 is attached to the front plate 32a.

  When the pressing portion 36 presses the contact portion 74 of the drainage portion 70 from above, the front end portion of the drainage portion 70 is pressed against the front plate 32a, and the drainage portion 70 is fixed on the front plate 32a. Thereby, shakiness of the drainage part 70 and wobbling of the drainage part 70 due to the user's finger entering from the drainage port 72 and hitting from below at the time of cleaning or the like can be suppressed.

  Moreover, since it is not necessary to use fasteners, such as a screw, for fixing the drainage part 70, the drainage part 70 can be fixed and released easily.

  In the above-described fixing structure, the front portion of the drainage unit 70 is pressed and fixed. However, the present invention is not limited to this. For example, a midway portion of the drainage unit 70 may be pressed. For example, it is good also as a structure which presses both the front part and the middle part of the drainage part 70. FIG. In addition, since the rear part of the drainage part 70 is fixed by the engagement hook 35, it is not necessary to press from above.

  Moreover, in the above-described fixing structure, the fixing of the drainage unit 70 is completed simply by attaching the cover 33. For example, a configuration in which a pressing member is separately provided between the draining unit 70 and the cover 33 may be used. Is possible.

  Further effects and modifications can be easily derived by those skilled in the art. Thus, the broader aspects of the present invention are not limited to the specific details and representative embodiments shown and described above. Accordingly, various modifications can be made without departing from the spirit or scope of the general inventive concept as defined by the appended claims and their equivalents.

DESCRIPTION OF SYMBOLS 20 Sanitary washing apparatus 32 Base plate 33 Cover 41 Water discharge nozzle 60 Tank 61 Tank main body 62 Inlet 63 Outlet 64 Overflow port 70 Drain part 71 Flow path 711 Enlarged part 712 Curved part 713 Wall part W3 Excess water

Claims (8)

A base plate;
An open-air tank provided on the base plate and storing water;
A water discharge nozzle that discharges water stored in the tank toward a local area of the user;
A drainage part provided on the base plate and for discharging excess water from the tank;
The tank
The tank body,
An inlet for flowing water into the tank body;
An outlet through which water in the tank body flows out to the water discharge nozzle;
An overflow port provided so as to form an air gap with the inflow port, and allowing the excess water to flow out to the drainage part;
The drainage part is
A flow path connected to the overflow port and through which the excess water flows;
A sanitary washing device, which is separate from the tank and separate from the base plate. The drainage part is
The sanitary washing device according to claim 1, wherein an upper portion of the flow path is opened. The drainage part is
The sanitary washing device according to claim 1 or 2, wherein a channel cross-sectional area of the channel is equal to or larger than a channel cross-sectional area of the overflow port. The drainage part is
The sanitary washing device according to any one of claims 1 to 3, further comprising an enlarged portion in which a channel cross-sectional area is enlarged in at least a part of the channel. The drainage part is
The sanitary washing device according to any one of claims 1 to 4, further comprising a curved portion that is curved in at least a part of the flow path. The drainage part is
Having at least a portion of the flow passage having an enlarged flow passage cross-sectional area;
The enlarged portion is
The sanitary washing device according to claim 5, wherein the sanitary washing device is provided on an upstream side of the curved portion. The drainage part is
The sanitary washing device according to claim 5 or 6, further comprising a wall portion facing in a flow direction of the excess water on an upstream side of the curved portion. A cover attached to the base plate and covering the top of the base plate;
The cover is
The sanitary washing device according to any one of claims 1 to 7, wherein the drainage unit is pressed from above in a state of being attached to the base plate.