JP2023118195A - sanitary washing equipment - Google Patents

Abstract

To provide a sanitary washing device in which earth fault current generated when earth fault occurs in a heat exchanger can be more surely interrupted even when the sanitary washing device is connected to an outlet with a connection portion reversed.SOLUTION: The sanitary washing device is provided, comprising: a connection portion having a first power source terminal and a second power source terminal; a heat exchanger having a heater; a spout nozzle spouting washing water; a temperature fuse and an electric current fuse placed on a power source path between one end of the heater and a first power source terminal; a switching element placed on a power source path between the other end of the heater and the second power source terminal; a control unit that controls the AC power supply to the heater; and a rectifier that rectifies electric current in such a manner that the electric current flows from one end to the other in the heater.SELECTED DRAWING: Figure 2

Description

Aspects of the present invention relate generally to sanitary washing devices.

2. Description of the Related Art A sanitary washing apparatus for washing a human body's private parts by jetting washing water is known. A sanitary washing device has a heat exchanger that heats washing water, and is capable of injecting warm water to the human body's private parts.

In such a sanitary washing apparatus, if the heat exchanger breaks down with respect to the ground due to a lightning strike or the like, a ground fault phenomenon may occur in which current flows from the path on the hot side to the ground. When a ground fault occurs, the heat exchanger is overheated by the ground fault current, and high-temperature water may be discharged, or problems such as electric shock to the human body may occur. Therefore, a safety device such as a thermal fuse or a current fuse is provided on the hot side path so that the ground fault current can be cut off immediately when a ground fault phenomenon occurs.

However, if the connection part (power plug) of the sanitary washing device is connected to the outlet with the hot and cold sides reversed, the insulation of the heat exchanger may break down. The ground fault current does not flow through the thermal fuse or the current fuse, and the ground fault current flows through the path on the cold side. Therefore, when a ground fault current flows through the cold side path, for example, control is performed to cut off the ground fault current by turning off the switching element provided on the cold side path. However, if the switching element fails, it may become impossible to cut off the ground fault current flowing through the path on the cold side.

Japanese Utility Model Laid-Open No. 7-38281

The present invention has been made based on the recognition of such problems, and is a sanitary appliance that can more reliably cut off the ground fault current in the event of a ground fault in the heat exchanger even if the connecting part is connected to an outlet in an inverted state. The object is to provide a cleaning device.

A first invention has a first power terminal and a second power terminal, and a connecting portion electrically connected to an AC power supply via the first power terminal and the second power terminal. a ground electrode for grounding water flowing inside; and a heater unit having a heater electrically insulated from the water flowing inside, wherein one end of the heater is electrically connected to the first power supply terminal. Then, by electrically connecting the other end of the heater to the second power supply terminal, AC power supplied from the water supply source is supplied to the heater via the connection portion from the supply power supply. A heat exchanger for heating washing water by the heater, a jetting nozzle for jetting the washing water supplied through the heat exchanger, and a power supply path between one end of the heater and the first power terminal. a thermal fuse for opening the power supply path between one end of the heater and the first power supply terminal when the temperature of the heat exchanger exceeds a predetermined temperature; a current fuse provided on a power supply path between a first power supply terminal and opening the power supply path between one end of the heater and the first power supply terminal when a current equal to or higher than a rated current flows; Provided on a power supply path between the other end of the heater and the second power supply terminal, a state of supplying the AC power to the heater and a state of stopping the supply of the AC power to the heater. a switching element for switching, a control unit for controlling the supply of the AC power to the heater by controlling switching of the switching element, and a rectifying unit for rectifying the heater so that the current flows from the one end to the other end of the heater. and a rectifying section for performing the sanitary washing.

According to this sanitary washing device, the rectifying section can fix the direction of the current so that the current flows from one end to the other end of the heater. As a result, even when the connector is connected to the outlet while the first power terminal and the second power terminal of the connection part are not reversed, the power supply terminal can be connected to the outlet with the first power terminal and the second power terminal of the connection part reversed. A current fuse and a thermal fuse can interrupt the ground fault current even when connected to In other words, even if the connection portion is connected to the outlet while being reversed, the ground fault current can be cut off more reliably when the heat exchanger is grounded. Therefore, user safety can be enhanced.

In a second aspect based on the first aspect, it further comprises a temperature detection section capable of detecting the temperature of the washing water heated by the heater section, and the control section controls the washing water detected by the temperature detection section. The sanitary washing apparatus is characterized by executing a prohibition mode for prohibiting the ejection of cleaning water from the ejection nozzle when the temperature transition during heating differs from a preset temperature transition.

According to this sanitary washing device, when the temperature transition during heating of the washing water detected by the temperature detection unit is different from the set temperature transition set in advance, the prohibition mode for prohibiting the ejection of the washing water from the ejection nozzle is set. By executing this, it is possible to prevent the user from receiving an electric shock in the event of a ground fault, and it is possible to prevent the ejection of high-temperature washing water from the ejection nozzle in the event of a ground fault. Thereby, the user's safety can be enhanced.

According to a third aspect, in the first or second aspect, a temperature detecting portion capable of detecting the temperature of the washing water heated by the heater portion, and an electromagnetic valve controlling supply of washing water to the ejection nozzle. , wherein the control unit supplies water to the ejection nozzle by the electromagnetic valve when the temperature transition during heating of the wash water detected by the temperature detection unit is different from a preset temperature transition. The sanitary washing device is characterized by executing a prohibition mode that prohibits the

According to this sanitary washing device, when the temperature transition during heating of the washing water detected by the temperature detection unit is different from the set temperature transition set in advance, the prohibition mode for prohibiting the water supply to the ejection nozzle is set by the solenoid valve. By executing this, it is possible to more reliably suppress the jetting of high-temperature washing water from the jetting nozzle in the event of a ground fault. Thereby, the user's safety can be enhanced.

In a fourth aspect of the invention, in any one of the first to third aspects of the invention, a temperature detection section is provided to detect the temperature of the wash water heated by the heater section, and the control section detects The sanitary washing device is characterized in that, when the detected temperature of the washing water is higher than a preset temperature, the switching element stops supplying the AC power to the heater. .

According to this sanitary washing device, when the temperature of the washing water detected by the temperature detection unit is higher than the preset set temperature, the switching element stops supplying AC power to the heater. , the heating of the wash water can be stopped when the wash water is heated to a high temperature. Thereby, the user's safety can be enhanced.

In a fifth aspect based on the second or third aspect, the control unit determines whether or not the temperature transition differs from the set temperature transition before starting water supply to the jet nozzle. It is a sanitary washing device characterized by:

According to this sanitary washing device, before starting water supply to the ejection nozzle, it is determined whether or not the temperature transition during heating of the cleaning water differs from the set temperature transition. It is possible to more reliably suppress the ejection of washing water. Thereby, the user's safety can be improved.

In a sixth aspect based on the second or third aspect, the control unit re-determines whether or not the temperature transition is different from the set temperature transition during execution of the prohibition mode. The sanitary washing device is characterized in that execution of the prohibition mode is stopped when the change in temperature does not differ from the set temperature.

According to this sanitary washing device, during execution of the prohibition mode, it is re-determined whether or not the temperature transition during heating of the washing water differs from the set temperature transition, and if the temperature transition does not differ from the set temperature transition, the prohibition mode is performed. By stopping the execution of the mode, the prohibition mode can be canceled when, for example, an erroneous failure determination occurs due to disturbance noise or the like. This can improve usability.

A seventh invention is the sanitary washing device according to any one of the first to sixth inventions, wherein the rectifying section performs full-wave rectification.

According to this sanitary washing device, since the rectifying section performs full-wave rectification, the efficiency of heating in the heat exchanger can be improved as compared with the case where the rectifying section performs half-wave rectification. This can improve usability.

ADVANTAGE OF THE INVENTION According to the aspect of this invention, the sanitary washing apparatus which can cut off the ground fault current more reliably when a heat exchanger is ground-faulted is provided, even if it connects to an outlet in the state which the connection part was reversed.

1 is a block diagram showing the main configuration of a sanitary washing device according to an embodiment; FIG. It is a block diagram showing a part of sanitary washing device concerning an embodiment. FIGS. 3(a) and 3(b) are explanatory diagrams showing the straightening section of the sanitary washing device according to the embodiment. FIGS. 4(a) and 4(b) are graphs showing an example of temperature transition when washing water is heated. 4 is a flow chart showing an example of the operation of the sanitary washing device according to the embodiment; 4 is a flow chart showing an example of the operation of the sanitary washing device according to the embodiment; It is a block diagram showing a part of sanitary washing apparatus of reference.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, in each drawing, the same reference numerals are given to the same constituent elements, and detailed description thereof will be omitted as appropriate.
FIG. 1 is a block diagram showing the main configuration of a sanitary washing device according to an embodiment.
As shown in FIG. 1, the sanitary washing device 10 includes a heat exchanger 20, a jet nozzle 30, and a controller 40. As shown in FIG. In addition, FIG. 1 also shows the essential configuration of the water channel system and the essential configuration of the electrical system of the sanitary washing device 10 .

The heat exchanger 20 has a first heater 21 and a second heater 22 . The resistance value of the second heater 22 is higher than the resistance value of the first heater 21, for example. The heat exchanger 20 heats the wash water supplied from the water supply source WS with the first heater 21 and the second heater 22 . However, the number of heaters provided in the heat exchanger 20 is not limited to two, and may be one or three or more.

The jet nozzle 30 has a jet port 32 provided at its tip. The jet nozzle 30 jets the cleansing water supplied through the heat exchanger 20 from the jet port 32 to wash the human body (eg, the "buttocks") of a user sitting on a toilet seat (not shown).

For example, as shown in FIG. 1, the sanitary washing device 10 according to the present embodiment has a channel 12 that guides water supplied from a water supply source WS such as a tap or a water storage tank to the ejection port 32 of the ejection nozzle 30. . A solenoid valve 14 is provided upstream of the flow path 12 . The electromagnetic valve 14 is an electromagnetic valve that can be opened and closed, and controls water supply based on commands from the control unit 40 . In other words, the electromagnetic valve 14 switches between supplying water to the ejection nozzle 30 and stopping the water supplied from the water supply source WS.

A heat exchanger 20 is provided downstream of the solenoid valve 14 . The heat exchanger 20 heats the water supplied from the water supply source WS using the first heater 21 and the second heater 22 to raise the temperature of the water, for example, to a specified temperature. The heat exchanger 20 converts the water supplied from the water supply source WS into hot water at a set temperature.

The heat exchanger 20 of the present embodiment is, for example, an instantaneous heating type (instantaneous) heat exchanger using a cylindrical ceramic heater or the like. The first heater 21 and the second heater 22 are, for example, heater patterns provided on a ceramic heater. The instantaneous heat exchanger 20 does not store water in a tank or the like, but heats while flowing water inside. The heat exchanger 20 may be a hot water storage type heat exchanger that heats water stored in a tank.

Downstream of the heat exchanger 20, a flow rate switching valve 33 for adjusting the flow rate, and a flow path switching valve 34 for opening and closing the water supply to the ejection nozzle 30 and the nozzle cleaning chamber 36 and switching the water supply destination are provided. ing. The flow rate switching valve 33 adjusts the flow rate of water flowing to the ejection nozzle 30 . The channel switching valve 34 can switch the water supply destination (connection destination of the channel) to either the ejection nozzle 30 or the nozzle cleaning chamber 36 . The flow switching valve 33 and the flow switching valve 34 may be provided as one unit.

A jet nozzle 30 is provided downstream of the flow rate switching valve 33 and the flow path switching valve 34 . The ejection nozzle 30 receives a driving force from a nozzle motor 38 and can advance into the bowl of the toilet or retreat into the casing. In other words, the nozzle motor 38 can move the ejection nozzle 30 back and forth based on a command from the controller 40 .

The nozzle washing chamber 36 can sterilize or wash the outer peripheral surface (body) of the ejection nozzle 30 by injecting sterilizing water or water from a water discharging portion (not shown) provided therein. Alternatively, the nozzle cleaning chamber 36 can sterilize or clean the ejection port 32 portion of the ejection nozzle 30 in the housed state.

The user can, for example, start or stop the ejection of cleansing water from the ejection nozzle 30 by operating the operation unit 50 . The user can set the temperature of the washing water heated in the heat exchanger 20 by operating the operation unit 50, for example. The operation unit 50 is, for example, a remote control installed on the wall of a toilet room or the like. The operation unit 50 may be, for example, an operation panel or the like provided integrally with the casing of the sanitary washing device 10 .

The control unit 40 is supplied with power from the supply power supply PS via the input circuit 41 and the power supply circuit 42, and operates the electromagnetic valve 14, the heat exchanger 20, the flow rate switching valve 33, and the like based on signals from the operation unit 50 and the like. , and controls the operation of the channel switching valve 34 and the nozzle motor 38 . For example, the control unit 40 controls the power supplied from the power supply PS to the first heater 21 and the second heater 22 of the heat exchanger 20 .

The power supply PS is, for example, an AC power supply. The power supply PS is, for example, a commercial power supply of AC 100V (effective value). The input circuit 41 is a circuit that absorbs electrical noise and external surge voltage entering from the power supply PS side. In addition, the input circuit 41 also has the purpose of not outputting noise generated by the device itself to the power supply PS side in order to prevent malfunction of the peripheral device. The input circuit 41 is composed of a capacitor, a coil, a varistor for surge absorption, and the like. The first heater 21 and the second heater 22 of the heat exchanger 20 are connected to the power supply PS via the input circuit 41 . AC power is supplied to the first heater 21 and the second heater 22 via the input circuit 41 . On the other hand, DC power is supplied to the control unit 40 via the input circuit 41 and the power supply circuit 42 . The power supply circuit 42 is provided on a path between the input circuit 41 and the control unit 40, converts AC power supplied from the supply power supply PS into DC power, and supplies the converted DC power to the control unit 40. .

FIG. 2 is a block diagram showing part of the sanitary washing device according to the embodiment.
As shown in FIG. 2, the sanitary washing device 10 includes a connecting portion 60, a rectifying portion 45, a first switching element 71, a second switching element 72, a current fuse 74, and a temperature fuse 76. .

The heat exchanger 20 has a heater section 112 having a first heater 21 and a second heater 22 , a case 114 and a ground electrode 134 . The first heater 21 and the second heater 22 are electrically insulated from water flowing inside the heat exchanger 20 . The ground electrode 134 grounds the water flowing inside the heat exchanger 20 .

The connecting portion 60 has a first power terminal 61 and a second power terminal 62 . The first power terminal 61 is, for example, a power terminal that is electrically connected to a power line (ungrounded side) of an AC supply power PS. The second power terminal 62 is, for example, a power terminal electrically connected to the neutral line (ground side) of the AC supply power PS. The first power terminal 61 is, for example, a live side power terminal (L side power terminal), and the second power terminal 62 is, for example, a neutral side power terminal (N side power terminal). However, contrary to the above, the first power terminal 61 may be the ground side and the second power terminal 62 may be the non-ground side.

The connection part 60 is, for example, an outlet plug. The first power terminal 61 is, for example, one terminal of an outlet plug, and the second power terminal 62 is, for example, the other terminal of the outlet plug. However, the connecting part 60 is not limited to an outlet plug, and may be, for example, a pair of wires directly connected to a switchboard or the like.

The heat exchanger 20 electrically connects one end of the first heater 21 and one end of the second heater 22 to the first power supply terminal 61, and connects the other end of the first heater 21 and the other end of the second heater 22 to the second heater. By electrically connecting to the power supply terminal 62, the washing water supplied from the water supply source WS based on the AC power supplied from the supply power supply PS to the first heater 21 and the second heater 22 via the connection portion 60. is heated by at least one of the first heater 21 and the second heater 22 .

In this example, an input circuit 41 is provided between the heat exchanger 20 and the connecting portion 60 . The input circuit 41 outputs, for example, the AC power supplied from the power supply PS to the heat exchanger 20 as it is. However, the input circuit 41 may convert the AC power supplied from the supply power supply PS into another AC power and output the converted AC power to the heat exchanger 20 . Thus, the AC power supplied from the supply power supply PS to the heat exchanger 20 may be the AC power of the supply power supply PS as it is, or may be the AC power after power conversion is performed in the input circuit 41 or the like. The AC power supplied to the heat exchanger 20 may be any AC power based on the AC power of the power supply PS.

A rectifying section 45 is provided between the heat exchanger 20 and the input circuit 41 . In this example, the rectifying section 45 is on the power supply path between one end of the first heater 21 and one end of the second heater 22 and the first power supply terminal 61 and the other end of the first heater 21 and the other end of the second heater 22 . It is provided on the power supply path between the end and the second power supply terminal 62 .

The rectifying unit 45 rectifies the first heater 21 and the second heater 22 so that the current flows from one end to the other end. That is, the direction of current (voltage polarity) in the first heater 21 and the second heater 22 is fixed. The rectifying section 45 will be described later.

The first switching element 71 is provided on the power supply path between the other end of the first heater 21 and the second power supply terminal 62 , and the state of supplying the AC power to the first heater 21 and the state of supplying the AC power to the first heater 21 are controlled. Switch between a state in which the supply of AC power is stopped.

The second switching element 72 is provided on the power supply path between the other end of the second heater 22 and the second power supply terminal 62 , and is configured to switch between the state of supplying AC power to the second heater 22 and the state of supplying AC power to the second heater 22 . Switch between a state in which the supply of AC power is stopped.

The first switching element 71 is provided, for example, between the other end of the first heater 21 and one AC output terminal of the input circuit 41 . Similarly, the second switching element 72 is provided, for example, between the other end of the second heater 22 and one AC output terminal of the input circuit 41 . However, the arrangement of the first switching element 71 is not limited to this, and may be at any position on the power supply path between the other end of the first heater 21 and the second power supply terminal 62 . The arrangement of the second switching element 72 is not limited to this, and may be at any position on the power supply path between the other end of the second heater 22 and the second power supply terminal 62 .

The first switching element 71 and the second switching element 72 have, for example, a pair of main terminals and a control terminal, and switch on/off of the current flowing between the pair of main terminals according to a signal input to the control terminal. . The first switching element 71 and the second switching element 72 are semiconductor switches, for example. A thyristor or a triac, for example, is used for the first switching element 71 and the second switching element 72 . The first switching element 71 and the second switching element 72 may be, for example, arbitrary elements capable of controlling on/off of current and allowing current to flow in at least one direction. The first switching element 71 and the second switching element 72 may be configured by, for example, combining a plurality of semiconductor switches.

The 1st heater 21 and the 2nd heater 22 heat|fever-generate by sending an electric current between a pair of terminals, for example. The first heater 21 and the second heater 22 are resistors, for example.

The control unit 40 controls the supply of AC power to the first heater 21 by controlling the switching of the first switching element 71 , and the AC power to the second heater 22 by controlling the switching of the second switching element 72 . control the supply of AC power to the The control unit 40 controls switching of the first switching element 71 and the second switching element 72 by being electrically connected to respective control terminals of the first switching element 71 and the second switching element 72, for example. do.

The current fuse 74 is provided on the power supply path between one end of the first heater 21 and one end of the second heater 22 and the first power supply terminal 61 . The current fuse 74 opens the power supply path between the connection part 60 and the first heater 21 and the power supply path between the connection part 60 and the second heater 22 when a current higher than the rated current flows. , the power supply to the first heater 21 and the second heater 22 is cut off. As a result, the current fuse 74 prevents a current exceeding the rated current from flowing into the heat exchanger 20 . In addition, the current fuse 74 is preferably provided to the power terminal on the non-ground side of the first power terminal 61 and the second power terminal 62 .

The current fuse 74 opens the power supply path by blowing, for example, when a current higher than the rated current flows. For example, the current fuse 74 opens the power supply path by opening the contact when a current higher than the rated current flows, and closes the contact when the rated current becomes less than the rated current. A self-restoring fuse that reconnects the power supply path may also be used.

The thermal fuse 76 is provided on the power supply path between one end of the first heater 21 and one end of the second heater 22 and the first power supply terminal 61 . One end of the first heater 21 and one end of the second heater 22 are electrically connected to the first power supply terminal 61 via the thermal fuse 76 .

The thermal fuse 76 opens the power supply path between one end of the first heater 21 and one end of the second heater 22 and the first power supply terminal 61 when the temperature of the heat exchanger 20 reaches or exceeds a predetermined temperature. , the power supply to the first heater 21 and the second heater 22 is cut off. As a result, the thermal fuse 76 prevents the heat exchanger 20 from generating heat above a predetermined temperature. The thermal fuse 76 suppresses the heat exchanger 20 from running dry, for example.

For example, when the temperature of the heat exchanger 20 reaches or exceeds a predetermined temperature, the thermal fuse 76 fuses to connect one end of the first heater 21 and one end of the second heater 22 to the first power supply terminal 61 . Open the power supply path between For example, when the temperature of the heat exchanger 20 becomes equal to or higher than a predetermined temperature, the thermal fuse 76 opens the power supply path by opening the contact, and the temperature of the heat exchanger 20 becomes less than the predetermined temperature. A self-restoring fuse may also be used, which reconnects the power supply path when the contact is turned on.

Moreover, in this example, the sanitary washing device 10 further includes a temperature detection section 84 . The temperature detection section 84 can detect the temperature of the washing water heated by the heater section 112 . The temperature detector 84 is, for example, a thermistor. The temperature detection section 84 is electrically connected to the control section 40 and outputs detection results to the control section 40 .

The rectifying section 45 will be described with reference to FIGS. 3(a) and 3(b).
FIGS. 3(a) and 3(b) are explanatory diagrams showing the straightening section of the sanitary washing device according to the embodiment.
As shown in FIG. 3A, the rectifier 45 is, for example, a diode bridge. The rectifying section 45 is provided on the power supply path between the heat exchanger 20 (the first heater 21 and the second heater 22) and the connection section 60 (the first power terminal 61 and the second power terminal 62).

As shown in FIG. 3B, when the rectifier 45 performs full-wave rectification, the rectifier 45 converts the negative voltage component of the AC input voltage into a positive voltage, thereby fixing the direction of current flow. do.

As indicated by solid arrows in FIG. 3A, the current flowing from the first power terminal 61 side flows through the diode D4, the heat exchanger 20, and the diode D2 in this order, and then flows to the second power terminal 62. On the other hand, as indicated by the dashed arrow in FIG. flow. In this manner, the rectifying section 45 fixes the directions of the currents in the first heater 21 and the second heater 22 by rectifying. In other words, the rectification unit 45 suppresses the ground fault current from flowing through the cold-side path.

In this example, the rectifier 45 performs full-wave rectification, but the rectifier 45 may perform half-wave rectification. In this case, the rectifier 45 is, for example, a diode. When the rectifier 45 performs half-wave rectification, the rectifier 45 eliminates the negative voltage component of the input voltage, thereby fixing the direction of current flow. However, from the viewpoint of heating efficiency in the heat exchanger 20, the rectifying section 45 preferably performs full-wave rectification.

FIGS. 4(a) and 4(b) are graphs showing an example of temperature transition when washing water is heated.
In FIG. 4(a), the solid line represents an example of the temperature transition during heating of the wash water when the straightening unit 45 is not out of order. In FIG. 4B, the solid line represents an example of the temperature change during heating of the wash water when the straightening unit 45 is out of order, and the temperature change during heating of the cleansing water when the straightening unit 45 is not out of order. An example of is represented by a two-dot chain line. The temperature transition during heating of the cleaning water is detected by, for example, the temperature detection unit 84 .

As shown in FIG. 4(a), when the rectifying section 45 is not malfunctioning, when power supply to the heater is started at time t1, the temperature of the wash water rises, and at time t2, the temperature of the wash water rises. reaches a predetermined temperature. When the temperature of the cleansing water reaches a predetermined temperature, the control unit 40, for example, controls power supply to the heater every half wave to perform heat retention control to keep the temperature of the cleansing water at the predetermined temperature. For example, the control unit 40 stores the temperature transition during heating of the cleaning water when the rectifying unit 45 is not malfunctioning as a preset temperature transition.

On the other hand, as shown in FIG. 4B, when the rectifying section 45 is out of order, for example, the half-wave portion indicated by the dashed line is not energized. Therefore, when power supply to the heater is started at time t1, the temperature of the wash water rises, but the temperature of the wash water does not reach the predetermined temperature even at time t2. Further, at time t3, when the temperature of the wash water reaches a predetermined temperature, the control unit 40, for example, controls the energization of the heater every half wave to keep the temperature of the wash water at the predetermined temperature. However, the temperature of the washing water cannot be maintained at the specified temperature.

As described above, the temperature transition during heating of the cleansing water when the straightening unit 45 is out of order is different from the temperature transition during heating of the cleansing water when the straightening unit 45 is not out of order. More specifically, for example, the slope (increase rate) of the temperature transition during heating of the cleansing water when the straightening unit 45 is out of order is It is smaller than the slope (increase rate) of the temperature transition. Also, for example, the temperature of the wash water after a predetermined time from the start of heating when the straightening unit 45 is out of order is higher than the temperature of the wash water after a predetermined time from the start of heating when the straightening unit 45 is not out of order. low. Further, for example, the temperature of the washing water a predetermined time after reaching the predetermined temperature when the straightening unit 45 is out of order is the same as the temperature of the washing water after a predetermined time after reaching the predetermined temperature when the straightening unit 45 is not out of order. Lower than the wash water temperature.

For example, the control unit 40 detects a set temperature transition that is preset when the temperature transition during heating of the washing water detected by the temperature detection unit 84 (that is, when the washing water is heated when the rectifying unit 45 is not malfunctioning). temperature transition), it can be determined that the temperature transition during heating of the washing water is abnormal. For example, the control unit 40 detects a set temperature transition that is preset when the temperature transition during heating of the washing water detected by the temperature detection unit 84 (that is, when the washing water is heated when the rectifying unit 45 is not malfunctioning). temperature transition), it can be determined that the rectifying unit 45 is out of order. For example, when the control unit 40 determines that the temperature transition during heating of the cleaning water is abnormal (when determining that the rectifying unit 45 is out of order), it executes a prohibition mode, which will be described later.

FIG. 5 is a flow chart showing an example of the operation of the sanitary washing device according to the embodiment.
As shown in FIG. 5, the control unit 40 determines whether or not it has received a command signal to start water discharge from the jet nozzle 30 (step S101). The control unit 40 repeats step S101 until receiving a command signal to start water ejection from the ejection nozzle 30 (step S101: No).

When receiving a command signal to start water discharge from the jet nozzle 30 (step S101: Yes), the controller 40 determines whether or not the temperature transition during heating of the washing water is normal (step S102).

If it is determined that the temperature transition during heating of the cleaning water is normal (step S102: Yes), the control unit 40 starts supplying water to the ejection nozzle 30 (step S103).

If it is determined that the temperature transition during heating of the washing water is abnormal (step S102: No), the control unit 40 starts execution of the prohibition mode (step S104). In the prohibition mode, the control unit 40 prohibits, for example, ejection of cleaning water from the ejection nozzles 30 . For example, the control unit 40 prohibits the ejection of cleaning water from the ejection nozzle 30 by prohibiting the advancement of the ejection nozzle 30 . In addition, the control unit 40 may prohibit water supply to the ejection nozzle 30 by, for example, closing the electromagnetic valve 14 in the prohibition mode.

When execution of the prohibition mode is started, the control unit 40 re-determines whether or not the temperature transition during heating of the cleaning water is normal (step S105). In the re-determination, if it is determined that the temperature transition during heating of the wash water is abnormal (step S105: No), the control unit 40 continues execution of the prohibition mode.

In the re-determination, if it is determined that the temperature transition during heating of the cleaning water is normal (step S105: Yes), the control unit 40 stops execution of the prohibition mode (step S106). In other words, if the control unit 40 determines in the re-determination that the temperature transition during heating of the cleaning water is normal, it cancels the prohibition mode.

FIG. 6 is a flow chart showing an example of the operation of the sanitary washing device according to the embodiment.
As shown in FIG. 6, the controller 40 determines whether or not the temperature of the wash water detected by the temperature detector 84 is higher than a preset temperature (step S201). The set temperature is, for example, 40°C.

When the temperature of the cleaning water detected by the temperature detection unit 84 is equal to or lower than the preset set temperature (step S201: Yes), the control unit 40 stops supplying AC power to the first heater 21 and the second heater 22. Maintain (step S202).

When the temperature of the cleaning water detected by the temperature detection unit 84 is higher than the preset temperature (step S201: No), the control unit 40 supplies AC power to the first heater 21 and the second heater 22. is stopped (step S203). The control unit 40 stops supplying AC power to the first heater 21 and the second heater 22 by turning off the first switching element 71 and the second switching element 72 .

When the AC power supply to the first heater 21 and the second heater 22 is stopped, the control unit 40 determines whether the temperature of the wash water detected by the temperature detection unit 84 is higher than the preset temperature. Re-determine (step S204). In the re-determination, if it is determined that the temperature of the wash water detected by the temperature detection unit 84 is higher than the preset temperature (step S204: No), the control unit 40 controls the first heater 21 and the second heater The state in which the supply of AC power to 22 is stopped continues.

In the re-determination, if it is determined that the temperature of the wash water detected by the temperature detection unit 84 is equal to or lower than the preset set temperature (step S204: Yes), the control unit 40 controls the first heater 21 and the second heater 22 is restarted (step S205). In other words, if the control unit 40 determines in the re-determination that the temperature of the wash water detected by the temperature detection unit 84 is equal to or lower than the preset set temperature, the control unit 40 causes the first heater 21 and the second heater 22 Cancel the state in which the power supply is stopped.

FIG. 7 is a block diagram showing part of a reference sanitary washing device.
FIG. 7 schematically shows part of a reference sanitary washing device in which the rectifying section 45 is omitted and only the current fuse 74 and the temperature fuse 76 are provided.

As shown in FIG. 7, in the configuration of the reference sanitary washing device, dielectric breakdown occurred between the water flowing inside and the first heater 21 or the second heater 22, and the temperature fuse 76 fused due to abnormal heat generation. In some cases, current may flow from the first heater 21 or the second heater 22 to the ground side through the internal water depending on the position where the dielectric breakdown occurs.

FIG. 7 illustrates a case where dielectric breakdown occurs at one end of the second heater 22 near the first power supply terminal 61 between the water flowing inside and the second heater 22 . In this case, if the connection portion 60 and the power supply PS are connected erroneously, and the second power supply terminal 62 is connected to the power line side of the power supply PS, as indicated by the arrow A1 in FIG. Current flows from the second power supply terminal 62 to the second switching element 72 , the second heater 22 , and from the dielectric breakdown portion to the ground electrode 134 via the water inside the heat exchanger 20 . In this case, the current continues to flow through the second heater 22 even after the current fuse 74 and the thermal fuse 76 are fused, and there is a possibility that the heat generation of the second heater 22 cannot be stopped appropriately.

On the other hand, in the sanitary washing device 10 according to this embodiment, the heat exchanger 20 has the ground electrode 134 for grounding the water flowing inside. As a result, even if dielectric breakdown occurs between the water flowing inside and the first heater 21 and the second heater 22, the electric current leaked from the first heater 21 and the second heater 22 to the water travels through the water, , and the safety against electric leakage from the first heater 21 and the second heater 22 can be enhanced.

In the sanitary washing device 10, the current direction can be fixed so that the current flows from one end to the other end of the heaters (the first heater 21 and the second heater 22) by the rectifying section 45. FIG. As a result, even when the first power terminal 61 and the second power terminal 62 of the connecting part 60 are connected to the outlet in a state where the first power terminal 61 and the second power terminal 62 are not reversed, the first power terminal 61 and the second power terminal 62 of the connecting part 60 are connected to each other. The current fuse 74 and the thermal fuse 76 can cut off the ground fault current even when the power supply is connected to the outlet in the reversed state. In other words, even if the connecting portion 60 is connected to an outlet in an inverted state, the ground fault current can be cut off more reliably when the heat exchanger 20 is grounded. Therefore, user safety can be enhanced.

In addition, when the temperature transition during heating of the cleaning water detected by the temperature detection unit 84 is different from the set temperature transition set in advance, the prohibition mode for prohibiting the ejection of the cleaning water from the ejection nozzle 30 can be executed. In addition, it is possible to prevent the user from receiving an electric shock in the event of a ground fault, and it is possible to suppress the ejection of high-temperature washing water from the ejection nozzle 30 in the event of a ground fault. Thereby, the user's safety can be enhanced.

In addition, when the temperature transition during heating of the cleaning water detected by the temperature detection unit 84 is different from the preset temperature transition, the electromagnetic valve 14 executes a prohibition mode for prohibiting the water supply to the ejection nozzle 30. Therefore, it is possible to more reliably suppress the ejection of high-temperature washing water from the ejection nozzle 30 at the time of a ground fault. Thereby, the user's safety can be enhanced.

Further, when the temperature of the cleaning water detected by the temperature detection unit 84 is higher than the preset temperature, the switching elements (first switching element 71 and second switching element 72) are switched to the heaters (first heater 21 and By stopping the supply of AC power to the second heater 22), the heating of the washing water can be stopped when the washing water is heated to a high temperature. Thereby, the user's safety can be enhanced.

In addition, before starting water supply to the ejection nozzle 30, it is determined whether or not the temperature transition during heating of the cleaning water is different from the set temperature transition, so that high-temperature cleaning water is ejected from the ejection nozzle 30 in the event of a ground fault. can be suppressed more reliably. Thereby, the user's safety can be enhanced.

Also, during execution of the prohibition mode, it is determined again whether the temperature transition during heating of the cleaning water differs from the set temperature transition, and if the temperature transition does not differ from the set temperature transition, execution of the prohibition mode is stopped. Thus, for example, when an erroneous failure determination occurs due to disturbance noise or the like, the prohibition mode can be canceled. This can improve usability.

Further, since the rectifying section 45 performs full-wave rectification, the efficiency of heating in the heat exchanger 20 can be improved as compared with the case where the rectifying section 45 performs half-wave rectification. This can improve usability.

As described above, according to the embodiment, there is provided a sanitary washing device that can more reliably cut off the ground fault current when the heat exchanger is grounded, even if the connector is connected to the outlet in an inverted state. .

The embodiments of the present invention have been described above. However, the invention is not limited to these descriptions. Appropriate design changes made by those skilled in the art with respect to the above embodiments are also included in the scope of the present invention as long as they have the features of the present invention. For example, the shape, size, material, arrangement, and the like of each element included in the sanitary washing device are not limited to those illustrated and can be changed as appropriate.
Moreover, each element provided in each of the above-described embodiments can be combined as long as it is technically possible, and a combination of these is also included in the scope of the present invention as long as it includes the features of the present invention.

REFERENCE SIGNS LIST 10 sanitary washing device 12 flow path 14 solenoid valve 20 heat exchanger 21 first heater 22 second heater 30 ejection nozzle 32 ejection port 33 flow rate switching valve 34 flow path switching valve 36 nozzle cleaning chamber 38 nozzle motor 40 control section 41 input circuit 42 power supply circuit 45 rectification section 50 operation section 60 connection section 61 first power supply terminal 62 second power supply terminal 71 first switching element 72 second switching element 74 current fuse 76 temperature fuse 84 temperature detection section 112 heater section 114 case 134 ground electrode PS Power supply WS Water supply

Claims (7)

a connecting portion having a first power terminal and a second power terminal, and electrically connected to an AC power supply via the first power terminal and the second power terminal;
a ground electrode for grounding water flowing inside; and a heater unit having a heater electrically insulated from the water flowing inside, one end of the heater being electrically connected to the first power supply terminal. , by electrically connecting the other end of the heater to the second power supply terminal, washing is performed based on AC power supplied from the supply power source to the heater through the connection portion. a heat exchanger that heats water with the heater;
a jetting nozzle for jetting washing water supplied through the heat exchanger;
provided on a power supply path between one end of the heater and the first power supply terminal, and when the temperature of the heat exchanger reaches or exceeds a predetermined temperature, a a thermal fuse opening the power path between
provided on a power supply path between one end of the heater and the first power supply terminal, the power supply path between the one end of the heater and the first power supply terminal being cut off when a current equal to or higher than a rated current flows. a current fuse that opens;
Provided on a power supply path between the other end of the heater and the second power supply terminal, a state of supplying the AC power to the heater and a state of stopping the supply of the AC power to the heater. a switching element to switch;
a control unit that controls supply of the AC power to the heater by controlling switching of the switching element;
a rectification unit that rectifies the current so that the current flows from the one end to the other end of the heater;
A sanitary washing device comprising: further comprising a temperature detection unit capable of detecting the temperature of the washing water heated by the heater unit;
The control unit activates a prohibition mode for prohibiting the ejection of cleaning water from the ejection nozzle when the temperature transition during heating of the cleaning water detected by the temperature detection unit differs from a preset temperature transition. 2. The sanitary washing device according to claim 1, wherein: further comprising a temperature detection unit capable of detecting the temperature of the wash water heated by the heater unit; and an electromagnetic valve controlling supply of wash water to the jet nozzle,
The control unit is configured in a prohibition mode in which the electromagnetic valve prohibits water supply to the ejection nozzle when the temperature transition during heating of the cleaning water detected by the temperature detection unit differs from a preset temperature transition. 3. The sanitary washing device according to claim 1 or 2, characterized in that: a temperature detection unit capable of detecting the temperature of the washing water heated by the heater unit;
When the temperature of the cleaning water detected by the temperature detection unit is higher than a preset temperature, the control unit causes the switching element to stop supplying the AC power to the heater. The sanitary washing device according to any one of claims 1 to 3, characterized in that: 4. The sanitary washing apparatus according to claim 2, wherein said control unit determines whether said temperature transition differs from said set temperature transition before starting water supply to said jet nozzle. The control unit re-determines whether or not the temperature transition differs from the set temperature transition during execution of the prohibition mode, and executes the prohibition mode when the temperature transition does not differ from the set temperature transition. 4. The sanitary washing device according to claim 2 or 3, characterized in that it stops the The sanitary washing device according to any one of claims 1 to 6, wherein the rectifying section performs full-wave rectification.

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