JP2023030624A - Sanitary cleaning device - Google Patents

Abstract

[Problem] To provide a sanitary washing device that can more appropriately stop the generation of heat from a heater while improving safety against electric leakage from the heater even when dielectric breakdown occurs between the heater and the water flowing inside in an instantaneous heat exchanger. [Solution] A sanitary washing device characterized by comprising a heat exchanger having a connection part with a first power supply terminal and a second power supply terminal, a ground electrode that grounds the water flowing inside, and a heater part having a heater electrically insulated from the water flowing inside, a spray nozzle that sprays cleaning water, a switching element provided on a power supply path between the other end of the heater and the second power supply terminal, a control part that controls the supply of AC power to the heater by switching the switching element, a first temperature fuse provided on the power supply path between one end of the heater and the first power supply terminal, and a second temperature fuse provided on the power supply path between the other end of the heater and the second power supply terminal. [Selected Figure] Figure 5

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.

2. Description of the Related Art As a heat exchanger used in a sanitary washing apparatus, a so-called instant type heat exchanger is known, which heats water while flowing it inside without accumulating water in a tank or the like. A momentary heat exchanger has a heater. The heater heats water flowing inside the heat exchanger. The sanitary washing device also has a thermal fuse. The thermal fuse suppresses abnormal heat generation by opening the power supply path according to the temperature when abnormal heat is generated due to dry heating or the like, and by stopping power supply to the heater of the heat exchanger.

The instantaneous heat exchanger electrically isolates the water flowing inside and the heater. It has also been proposed for instantaneous heat exchangers to ground the water flowing inside the heat exchanger. As a result, even if dielectric breakdown occurs between the water flowing inside and the heater, it is possible to prevent the current leaked from the heater to the water from affecting the human body through the water. That is, it is possible to enhance the safety against electrical leakage from the heater.

However, when the water flowing inside the heat exchanger is grounded in this way, dielectric breakdown occurs between the water flowing inside and the heater. Current may flow from the heater to the ground side through the water inside, depending on the position of the occurrence of . In this case, the current continues to flow through the heater even after the thermal fuse opens the power supply path, and there is a possibility that the heat generation of the heater cannot be stopped appropriately.

For this reason, in the sanitary washing device, even if insulation breakdown occurs between the water flowing inside and the heater in the instantaneous heat exchanger, the heat generation of the heater is suppressed while increasing the safety against electric leakage from the heater. It is desirable to be able to stop more appropriately.

Japanese Patent Application Laid-Open No. 2018-31201

The present invention has been made based on the recognition of such problems, and provides safety against electrical leakage from the heater even when dielectric breakdown occurs between the water flowing inside and the heater in a momentary heat exchanger. To provide a sanitary washing device capable of stopping heat generation of a heater more appropriately while improving the performance.

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 the washing water by the heater, a jetting nozzle for jetting the washing water supplied through the heat exchanger, and a power supply path between the other end of the heater and the second power terminal. a switching element provided in the heater for switching between a state in which the AC power is supplied to the heater and a state in which the supply of the AC power to the heater is stopped; and a control unit that controls the supply of AC power to the heater, and is provided on a power supply path between one end of the heater and the first power supply terminal, and is provided when the temperature of the heat exchanger reaches or exceeds a predetermined temperature. a first thermal fuse for opening the power supply path between one end of the heater and the first power supply terminal; and a power supply path between the other end of the heater and the second power supply terminal, a second thermal fuse that opens the power supply path between the other end of the heater and the second power supply terminal when the temperature of the heat exchanger reaches a predetermined temperature or higher. It is a sanitary washing device that

According to this sanitary washing device, the heat exchanger has a ground electrode for grounding the water flowing inside. As a result, even if a dielectric breakdown occurs between the water flowing inside and the heater, the electric current leaked from the heater to the water is prevented from affecting the human body through the water. Safety can be improved. In this sanitary washing device, a first temperature fuse is provided on the power supply path between one end of the heater and the first power supply terminal, and a thermal fuse is provided on the power supply path between the other end of the heater and the second power supply terminal. and a second thermal fuse provided. As a result, when abnormal heat generation occurs due to dielectric breakdown between the water flowing inside and the heater, the power supply path is opened by the first thermal fuse and the second thermal fuse. However, the heat generation of the heater can be appropriately stopped. By opening the power supply path at both ends of the heater, it is possible to prevent the current from continuing to flow to the heater even after the power supply path is opened by the thermal fuse. Therefore, in a momentary heat exchanger, even if a dielectric breakdown occurs between the water flowing inside and the heater, it is possible to stop the heat generation of the heater more appropriately while increasing the safety against electric leakage from the heater. A cleaning device can be provided.

A second invention is the sanitary washing device according to the first invention, wherein the heater section is provided at a position between the first thermal fuse and the second thermal fuse.

According to this sanitary washing device, even if the surface temperature of the heater portion is uneven, it is possible to easily detect an abnormality in high temperature, and to quickly stop the heat generation of the heater in the event of an abnormality.

A third invention is the sanitary washing device according to the first or second invention, wherein the first thermal fuse and the second thermal fuse are provided at positions with different heights with respect to the heater section. is.

According to this sanitary washing device, even if surface temperature unevenness occurs in the height direction of the heater portion, it is possible to easily detect a high temperature abnormality and quickly stop heat generation of the heater in the event of an abnormality.

In a fourth aspect based on the third aspect, at least part of the second thermal fuse is provided at a position symmetrical to at least part of the first thermal fuse about the central axis of the heater section. This sanitary washing device is characterized by:

According to this sanitary washing device, even if the surface temperature of the heater portion is uneven, it is possible to detect a high temperature abnormality more easily and to stop the heater from generating heat more quickly when the abnormality occurs.

According to the aspect of the present invention, in the instantaneous heat exchanger, even when dielectric breakdown occurs between the water flowing inside and the heater, the heat generation of the heater is suppressed while increasing the safety against electric leakage from the heater. A sanitary washing device is provided that can be stopped more appropriately.

1 is a block diagram showing the main configuration of a sanitary washing device according to an embodiment; FIG. It is a sectional view showing a heat exchanger concerning an embodiment typically. It is an expanded sectional view which represents typically a part of heat exchanger which concerns on embodiment. It is an expanded sectional view which represents typically a part of heat exchanger which concerns on embodiment. 1 is a circuit diagram showing part of a sanitary washing device according to an embodiment; FIG. 1 is a cross-sectional view schematically showing part of a sanitary washing device according to an embodiment; FIG. It is a circuit 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 main configuration of the water channel system and the main 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 type) 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 user can set the hot water temperature by operating the operation unit 50 . 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 .

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 control unit 40 is supplied with power from the supply power source PS via the power supply circuit 42, and operates the solenoid valve 14, the heat exchanger 20, the flow rate switching valve 33, and the flow path switching based on signals from the operation unit 50 and the like. It controls the operation of the 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 power supply circuit 42 converts AC power supplied from the supply power supply PS into DC power, and supplies the converted DC power to the control unit 40 . On the other hand, the power supply circuit 42 supplies AC power to the first heater 21 and the second heater 22 of the heat exchanger 20 .

FIG. 2 is a cross-sectional view schematically showing the heat exchanger according to the embodiment.
As shown in FIG. 2, the heat exchanger 20 includes a heater section 112, a case 114, an axial member 116, and a coil spring 118. As shown in FIG.

The heater portion 112 has a cylindrical shape with a hollow portion 112a. The heater section 112 is, in other words, a cylindrical heater. The first heater 21 and the second heater 22 of the heat exchanger 20 are provided in the heater section 112 . It should be noted that the heater section 112 does not have to be a perfect cylinder, and may have a portion where the thickness changes. The cross-sectional shape of the heater section 112 does not have to be a perfect circle, and may have an elliptical portion or a polygonal portion. The heater section 112 may have a substantially cylindrical outer shape.

The heater part 112 is, for example, a cylindrical ceramic heater. The heater section 112 includes, for example, an outer portion forming an outer peripheral surface 112b of the heater portion 112, an inner portion forming an inner peripheral surface 112c of the heater portion 112, and a heat generating portion provided between the inner portion and the outer portion. and have The inner part and the outer part are molded from ceramics. The heat-generating part is in the form of a film in which a band-shaped first heater 21 and a second heater 22 (heater pattern) made of, for example, tungsten are sandwiched between insulating films. Thereby, the heater part 112 can heat the water in contact with the outer peripheral surface 112b and the inner peripheral surface 112c.

Also, the inner part and the outer part formed of ceramics are insulators. The outer peripheral surface 112b and the inner peripheral surface 112c are electrically insulating. Thereby, the heat exchanger 20 electrically insulates the first heater 21 and the second heater 22 from the water flowing in contact with the outer peripheral surface 112b and the inner peripheral surface 112c. The heater section 112 has a first heater 21 and a second heater 22 electrically insulated from water flowing inside. The inner and outer parts have, for example, high electrical insulation and high thermal conductivity.

Case 114 covers the outer periphery of heater section 112 . The case 114 has, for example, a case body 120 and a lid portion 122 . The case main body 120 covers the outer circumference of the heater section 112 . The case main body 120 is, for example, cylindrical with a diameter larger than that of the heater section 112 . The case main body 120 has a hollow portion 120a that accommodates the heater portion 112 . The heater part 112 is arranged substantially coaxially in the hollow part 120a of the cylindrical case main body 120, for example.

However, the shape of the case main body 120 may be any shape that can cover the outer periphery of the heater section 112 . For example, the case main body 120 may have a rectangular parallelepiped shape having a cylindrical hollow portion 120a capable of accommodating the heater portion 112 therein.

One end of the heater portion 112 is located inside the one end of the case main body 120 . In other words, one end of the heater section 112 is located inside the hollow section 120a. On the other hand, the other end of the heater portion 112 is located outside the other end of the case main body 120 . However, the other end of the heater portion 112 may be located inside the other end of the case main body 120 .

The lid portion 122 is provided at one end of the case body 120 on the side where the heater portion 112 does not protrude, and closes the one end of the cylindrical case body 120 . The lid portion 122 may be formed integrally with the case body 120, for example. The hollow portion 120a may have, for example, a bottomed hole shape with one end closed. The case 114 may have a configuration in which the heater section 112 is accommodated by a bottomed hole-shaped hollow section 120a.

The shaft core member 116 is provided in the hollow portion 112 a of the heater portion 112 . Axial member 116 is formed separately from case 114 and is not fixed to case 114 . The shaft core member 116 has, for example, a substantially columnar shape extending in the axial direction of the heater portion 112 and is arranged substantially coaxially within the hollow portion 112 a of the cylindrical heater portion 112 .

One ends of the heater portion 112 and the shaft core member 116 are arranged away from the case 114 . More specifically, one ends of the heater portion 112 and the shaft core member 116 are arranged away from the lid portion 122 of the case 114 . A space between the lid portion 122 and one end of the heater portion 112 and the axial core member 116 serves as a path for water to flow between the inside and outside of the heater portion 112 .

Coil spring 118 is provided between shaft core member 116 and inner peripheral surface 112 c of heater section 112 . The coil spring 118 is made of metal or resin, for example. The outer diameter of the coil spring 118 in its natural length state is slightly larger than the inner diameter of the inner peripheral surface 112 c of the heater section 112 . The coil spring 118 is provided in the hollow portion 112a of the heater portion 112 with its diameter slightly reduced by being twisted. As a result, the coil spring 118 abuts against the inner peripheral surface 112c of the heater portion 112 and is held in the hollow portion 112a of the heater portion 112 by its own elastic force that attempts to reduce the diameter.

FIG. 3 is an enlarged cross-sectional view schematically showing part of the heat exchanger according to the embodiment.
As shown in FIGS. 2 and 3 , the case body 120 of the case 114 forms an outer flow path 130 between itself and the outer peripheral surface 112 b of the heater section 112 . The case main body 120 has a projecting portion 120b. The protruding portion 120 b protrudes inward from the inner peripheral surface of the case body 120 and extends spirally along the axial direction of the case body 120 .

Heat exchanger 20 further comprises a coil spring 124 . Coil spring 124 is provided between case main body 120 and outer peripheral surface 112 b of heater section 112 . The coil spring 124 is made of metal or resin, for example. The inner diameter of the coil spring 124 in its natural length state is slightly smaller than the outer diameter of the outer peripheral surface 112 b of the heater section 112 . The coil spring 124 is provided on the outer peripheral surface 112b of the heater section 112 with its diameter slightly increased by being twisted. As a result, the coil spring 124 abuts against the outer peripheral surface 112b of the heater section 112 and is held on the outer peripheral surface 112b of the heater section 112 by its own elastic force that attempts to reduce the diameter.

The inner diameter of the case main body 120 at the tip portion of the projecting portion 120 b of the case main body 120 is slightly larger than the outer diameter of the outer peripheral surface 112 b of the heater portion 112 . Therefore, a slight gap is formed between the case main body 120 and the heater section 112 .

The thickness (diameter) of the wires of the coil spring 124 is larger than the gap between the case body 120 and the heater section 112 . Also, the pitch of the coil spring 124 is substantially the same as the pitch of the spiral protruding portion 120b. Thereby, the coil spring 124 closes the gap between the case main body 120 and the outer peripheral surface 112 b of the heater section 112 .

The heater part 112 is supported by, for example, the case body 120 (case 114 ) and arranged substantially coaxially within the hollow part 120 a of the cylindrical case body 120 .

As a result, the projecting portion 120 b of the case body 120 and the coil spring 124 form a spiral outer flow path 130 . By making the outer flow path 130 spiral in this way, the heat exchange rate between the water flowing through the outer flow path 130 and the heater section 112 can be increased. In addition, by forming the spiral outer flow path 130 using the coil spring 124, the effects of assembly errors and dimensional errors can be suppressed by the coil spring 124, and the spiral outer flow path 130 can be easily formed. .

FIG. 4 is an enlarged cross-sectional view schematically showing part of the heat exchanger according to the embodiment.
As shown in FIGS. 2 and 4 , the axial member 116 forms an inner flow path 132 between itself and the inner peripheral surface 112 c of the heater section 112 . The shaft core member 116 has a projecting portion 116a. The protruding portion 116 a protrudes outward from the outer peripheral surface of the shaft core member 116 and extends spirally along the axial direction of the shaft core member 116 .

The outer diameter of the shaft core member 116 at the tip portion of the projecting portion 116 a of the shaft core member 116 is slightly smaller than the inner diameter of the inner peripheral surface 112 c of the heater portion 112 . Therefore, a slight gap is formed between the shaft core member 116 and the heater section 112 .

The thickness (diameter) of the wire of coil spring 118 is greater than the distance of the gap between shaft core member 116 and heater portion 112 . Also, the pitch of the coil spring 118 is substantially the same as the pitch of the spiral protruding portion 116a. Thereby, the coil spring 118 closes the gap between the shaft core member 116 and the inner peripheral surface 112 c of the heater section 112 .

For example, the shaft core member 116 is not directly supported by the heater section 112 and the case main body 120 (case 114), but is supported by the heater section 112 via the coil spring 118, and is connected to the cylindrical heater via the coil spring 118. It is arranged substantially coaxially within the hollow portion 112 a of the portion 112 . That is, the shaft core member 116 is positioned by the coil spring 118 without being positioned by the case 114 . Thus, the coil spring 118 fills the gap between the axial member 116 and the inner peripheral surface 112 c of the heater section 112 , and the axial member 116 is positioned with respect to the heater section 112 by the coil spring 118 .

Thus, a spiral inner flow path 132 is formed by the projecting portion 116 a of the axial core member 116 and the coil spring 118 . Thus, by making the inner flow path 132 spiral, the heat exchange rate between the water flowing through the inner flow path 132 and the heater section 112 can be increased. In addition, by forming the spiral inner flow path 132 using the coil spring 118, the coil spring 118 can suppress the effects of assembly errors, dimensional errors, and the like, making it easier to form the spiral inner flow path 132. .

As shown in FIG. 2, the other end of the heater portion 112 protruding outside the other end of the case body 120 is connected to a water passage member 140 for flowing water into the hollow portion 112a of the heater portion 112. there is Further, the case main body 120 is provided with a water passage port 120c for flowing water into the hollow portion 120a of the case main body 120. As shown in FIG. The water passage port 120c is provided at an end portion of the case body 120 on the same side as the end portion of the heater portion 112 to which the water passage member 140 is connected.

In the heat exchanger 20, for example, water is supplied from the water passage member 140 into the hollow portion 112a of the heater portion 112. As shown in FIG. The water supplied into the hollow portion 112 a flows through the inner flow path 132 toward the opposite end of the heater portion 112 . At this time, the water flowing through the inner flow path 132 is heated by the heater section 112 by contacting the inner peripheral surface 12 c of the heater section 112 . The water that has flowed through the inner flow path 132 enters the outer flow path 130 through the space between the end of the heater portion 112 in the hollow portion 120 a of the case body 120 and the lid portion 122 , and flows through the outer flow path 130 . flow. Water flowing through the outer channel 130 is directed to the opposite end of the heater section 112 again. At this time, the water flowing through the outer flow path 130 is heated by the heater section 112 by contacting the outer peripheral surface 112 b of the heater section 112 . The water that has flowed through the outer flow path 130 is discharged to the outside of the case main body 120 (heat exchanger 20) through the water flow port 120c.

As a result, the water supplied to the heat exchanger 20 through the water passage member 140 is heated by the heater section 112 and replaced with hot water, and the hot water is discharged from the heat exchanger 20 . In addition, contrary to the above, water may be supplied from the water passage port 120 c and the generated warm water may be discharged to the water passage member 140 .

A power supply terminal 112d for supplying electric power to the first heater 21 and the second heater 22 of the heater portion 112 is provided at the other end of the heater portion 112 that protrudes outward from the other end of the case body 120 . Thus, the power supply terminal 112d is provided at the end opposite to the end that contacts water. As a result, the power supply terminal 112d is prevented from being exposed to water.

Also, as shown in FIG. 2, the heat exchanger 20 has a ground electrode 134 . The ground electrode 134 is provided at a position in contact with water flowing inside the heat exchanger 20 (case 114 ), and grounds the water flowing inside the heat exchanger 20 .

The potential of the ground electrode 134 is set to the reference potential. In other words, the ground electrode 134 sets the potential of the water flowing inside the heat exchanger 20 to the reference potential. The reference potential is, for example, the potential of the neutral line of the AC power supply PS. The reference potential is, for example, the ground potential. The reference potential may be, for example, the potential of the frame ground. The ground electrode 134 is set to a reference potential by being connected to an external electrode via, for example, wiring drawn out of the case 114 . However, the method of setting the potential of the ground electrode 134 is not limited to the above, and any method may be used.

Thus, the heat exchanger 20 is provided with a ground electrode 134 to ground the water flowing therein. As a result, even if a dielectric breakdown occurs between the water flowing inside and the heater section 112 (the first heater 21 and the second heater 22), the current leaked from the heater section 112 to the water is transferred to the ground electrode 134. can flow. As a result, it is possible to prevent the electric current leaking from the heater portion 112 to the water from affecting the human body sitting on the toilet seat through the water. That is, it is possible to enhance the safety against electric leakage from the heater section 112 .

The ground electrode 134 is provided, for example, on the inner surface of the lid portion 122 . As a result, while the water flowing through the inner flow path 132 enters the outer flow path 130 through the space between the end of the heater section 112 in the hollow section 120a of the case body 120 and the lid section 122, It can be brought into contact with the ground electrode 134 . However, the arrangement of the ground electrode 134 is not limited to the above, and may be any position that allows contact with the water flowing inside the heat exchanger 20 .

FIG. 5 is a circuit diagram showing part of the sanitary washing device according to the embodiment.
As shown in FIG. 5, the sanitary washing device 10 includes a connecting portion 60, a first switching element 71, a second switching element 72, a current fuse 74, a first thermal fuse 81, and a second thermal fuse 82. And prepare.

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, a power supply circuit 42 is provided between the heat exchanger 20 and the connecting portion 60 . The power supply circuit 42 outputs, for example, AC power supplied from the supply power supply PS to the heat exchanger 20 as it is. However, the power supply circuit 42 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 power supply circuit 42 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.

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 the state of supplying the AC power to the second heater 22 and the state of supplying the AC power to the second heater 22 are controlled. 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 power supply circuit 42 . 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 power supply circuit 42 . 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. . Triacs, for example, are 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 both directions. The first switching element 71 and the second switching element 72 may be, for example, mechanical relays, or may be configured by 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 first thermal fuse 81 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 second thermal fuse 82 is provided on the power supply path between the other end of the first heater 21 and the other end of the second heater 22 and the second power supply terminal 62 . 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 first thermal fuse 81 . The other end of the first heater 21 and the other end of the second heater 22 are electrically connected to the second power supply terminal 62 via the second thermal fuse 82 .

The first thermal fuse 81 closes 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 exceeds a predetermined temperature. It is opened to cut off the power supply to the first heater 21 and the second heater 22 . The second thermal fuse 82 connects the other end of the first heater 21 and the second heater 22 to the second power supply terminal 62 when the temperature of the heat exchanger 20 exceeds a predetermined temperature. The path is opened and power supply to the first heater 21 and the second heater 22 is cut off. As a result, the first thermal fuse 81 and the second thermal fuse 82 prevent the heat exchanger 20 from generating heat above a predetermined temperature. The 1st thermal fuse 81 and the 2nd thermal fuse 82 control the dry heating of the heat exchanger 20, for example.

For example, when the temperature of the heat exchanger 20 reaches or exceeds a predetermined temperature, the first thermal fuse 81 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 reaches or exceeds a predetermined temperature, the first thermal fuse 81 opens the power supply path by opening the contact, and the temperature of the heat exchanger 20 falls below the predetermined temperature. A self-restoring fuse may also be used that reconnects the power supply path by closing the contact when it becomes. The same applies to the second thermal fuse 82 as well.

The second thermal fuse 82 is provided, for example, on the power supply path between the first switching element 71 and the second switching element 72 and the second power supply terminal 62 . The second thermal fuse 82 is provided, for example, on the power supply path between the first switching element 71 and the second switching element 72 and one AC output terminal of the power supply circuit 42 . As a result, even when the heat exchanger 20 has a plurality of heaters, the power supply path between the plurality of heaters and the second power terminal 62 can be appropriately opened with only one second thermal fuse 82. .

However, if the heat exchanger 20 has multiple heaters, the sanitary washing device 10 may include multiple second thermal fuses 82 corresponding to the multiple heaters of the heat exchanger 20, respectively. In this example, the sanitary washing device 10 includes, for example, two second thermal fuses provided between the first heater 21 and the first switching element 71 and between the second heater 22 and the second switching element 72. 82 may be provided.

FIG. 6 is a cross-sectional view schematically showing part of the sanitary washing device according to the embodiment.
FIG. 6 schematically shows a cross section taken along line A1-A2 of FIG.
As shown in FIG. 6 , the heater section 112 of the heat exchanger 20 is provided between the first thermal fuse 81 and the second thermal fuse 82 . The first thermal fuse 81 and the second thermal fuse 82 are provided on both sides of the heater section 112 with the central axis CL of the cylindrical heater section 112 interposed therebetween, for example, when viewed from above. In other words, heater portion 112 is provided such that central axis CL of heater portion 112 is positioned between first thermal fuse 81 and second thermal fuse 82 .

Further, as shown in FIG. 6, the first thermal fuse 81 and the second thermal fuse 82 are provided at different heights with respect to the heater section 112, for example. The height of the second thermal fuse 82 with respect to the heater portion 112 is different from the height of the first thermal fuse 81 with respect to the heater portion 112 . In this example, the first thermal fuse 81 is arranged at a position higher than the second thermal fuse 82 . The first thermal fuse 81 is arranged, for example, above the central axis CL of the heater section 112 . The second thermal fuse 82 is arranged below the central axis CL of the heater section 112, for example.

Note that, contrary to the above, the second thermal fuse 82 may be arranged at a position higher than the first thermal fuse 81 . For example, one of the first thermal fuse 81 and the second thermal fuse 82 is arranged above the central axis CL of the heater section 112, and the other of the first thermal fuse 81 and the second thermal fuse 82 is arranged above the central axis CL of the heater section 112. It may be arranged below CL.

At least part of the second thermal fuse 82 is provided, for example, at a point-symmetrical position with respect to at least part of the first thermal fuse 81 about the central axis CL of the heater section 112 . For example, in a plane (cross section) orthogonal to the central axis CL of the heater section 112, the distance D1 from the central axis CL of the heater section 112 to the first thermal fuse 81 is is substantially the same as the distance D2 to

6, in a plane (cross section) perpendicular to the central axis CL of the heater section 112, the distance from the central axis CL of the heater section 112 to the center of the first thermal fuse 81 is defined as a distance D1. A distance D2 is the distance from the axis CL to the center of the second thermal fuse 82 . The distance D1 from the central axis CL of the heater portion 112 to the first thermal fuse 81 is not limited to this, and may be the distance at any position of the first thermal fuse 81 . Similarly, the distance D2 from the central axis CL of the heater section 112 to the second thermal fuse 82 may be the distance at any position of the second thermal fuse 82 . It is sufficient that the first thermal fuse 81 and the second thermal fuse 82 are provided so that the distances from the central axis CL of the heater section 112 are the same at least in part of each other.

However, the arrangement of the first thermal fuse 81 and the second thermal fuse 82 is not limited to the above. The first thermal fuse 81 and the second thermal fuse 82 may be arranged at any position where the temperature of the heat exchanger 20 (heater section 112) can be appropriately detected. For example, the first thermal fuse 81 and the second thermal fuse 82 may be arranged so as to sandwich the heater section 112 from above and below. The first thermal fuse 81 and the second thermal fuse 82 do not necessarily have to be arranged on both sides of the heater section 112 , and may be arranged closer to one side of the heater section 112 . The arrangement of the first thermal fuse 81 and the second thermal fuse 82 may be set as appropriate according to the mounting direction of the heat exchanger 20 with respect to the sanitary washing device 10, the direction of water flowing inside the heat exchanger 20, and the like. .

FIG. 7 is a circuit diagram showing part of a reference sanitary washing device.
FIG. 7 schematically shows a part of a reference sanitary washing device in which the second thermal fuse 82 is omitted and only the first thermal fuse 81 is provided.

As shown in FIG. 7, in the configuration of the reference sanitary washing device, dielectric breakdown occurs between the water flowing inside and the first heater 21 or the second heater 22, and abnormal heat generation causes the first thermal fuse 81 to break. Depending on the position where the dielectric breakdown occurs, current may flow from the first heater 21 or the second heater 22 to the ground side through the internal water when the melt is cut.

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 first thermal fuse 81 is 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 first temperature fuse 81 provided on the power supply path between one end of the first heater 21 and the second heater 22 and the first power supply terminal 61, the first heater 21 and the second and a second thermal fuse 82 provided on the power supply path between the other end of the heater 22 and the second power supply terminal 62 . As a result, when abnormal heat generation occurs due to dielectric breakdown between the water flowing inside and the first heater 21 and the second heater 22, the power supply path is opened by the first thermal fuse 81 and the second thermal fuse 82. Therefore, the heat generation of the first heater 21 and the second heater 22 can be appropriately stopped even if the dielectric breakdown occurs at any position. By opening the power supply paths at both ends of the first heater 21 and the second heater 22, even after the power supply paths are opened by the first thermal fuse 81 and the second thermal fuse 82, the first heater 21 and the second heater 22 are It is possible to suppress the current from continuing to flow.

Therefore, in the instantaneous heat exchanger 20, even if a dielectric breakdown occurs between the water flowing inside and the first heater 21 and the second heater 22, the electric leakage from the first heater 21 and the second heater 22 will occur. It is possible to provide the sanitary washing device 10 that can more appropriately stop the heat generation of the first heater 21 and the second heater 22 while enhancing the safety against the contamination.

Also, in the sanitary washing device 10 , the heater section 112 is provided between the first thermal fuse 81 and the second thermal fuse 82 . As a result, in the sanitary washing device 10, even if the surface temperature of the heater part 112 is uneven, it is easy to detect a high temperature abnormality, and the heat generation of the first heater 21 and the second heater 22 is quickly stopped when the abnormality occurs. be able to.

The instantaneous heat exchanger 20 uses a relatively high output heater. Therefore, in the instant type heat exchanger 20, when temperature unevenness occurs, there is a possibility that the temperature difference at each location becomes large. For example, the temperature tends to be higher on the downstream side of the flow path inside the heat exchanger 20 than on the upstream side of the flow path inside the heat exchanger 20 . Further, for example, the temperature tends to be higher at higher positions in the flow path inside the heat exchanger 20 than at lower positions in the flow path inside the heat exchanger 20 . Furthermore, when a plurality of heaters are provided in the heater section 112, temperature unevenness may occur depending on the position of each heater and the combination of heaters used. In the sanitary washing device 10, by providing the heater portion 112 at a position between the first thermal fuse 81 and the second thermal fuse 82, even if such temperature unevenness occurs, it is possible to easily detect an abnormality in high temperature. Heat generation of the first heater 21 and the second heater 22 can sometimes be stopped early.

Further, in the sanitary washing device 10 , the first thermal fuse 81 and the second thermal fuse 82 are provided at different heights with respect to the heater section 112 . As a result, even if the surface temperature of the heater portion 112 varies in the height direction, it is possible to easily detect an abnormality in high temperature and quickly stop the heat generation of the heater in the event of an abnormality.

Furthermore, in the sanitary washing device 10 , at least part of the second thermal fuse 82 is provided at a point-symmetrical position with respect to at least part of the first thermal fuse 81 with respect to the central axis CL of the heater section 112 . As a result, even if the surface temperature of the heater section 112 is uneven, it is possible to detect a high temperature abnormality more easily, and to stop the heat generation of the first heater 21 and the second heater 22 more quickly when the abnormality occurs.

In addition, in the above-described embodiment, the cylindrical heater portion 112 is shown. The shape of the heater part 112 is not limited to this, and may be, for example, a rectangular parallelepiped shape. In this example, water is brought into contact with the inner surface side and the outer surface side of the cylindrical heater portion 112 to perform heating. The heater section 112 may have an internal space and may be configured to allow water to contact only the inner surface, or may be configured to allow water to contact only the outer surface. The heater part 112 may have, for example, a rod-like shape without an internal space. The shape of the heater portion 112 may be any shape that can adequately heat water.

The central axis CL of the heater section 112 may be any axis passing through the center of the heater section 112 . For example, when the heater portion 112 has an irregular shape, the central axis CL may be an axis passing through the intersection of the horizontal center and the vertical center of the heater portion 112 .

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 10 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.

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, 42 power supply circuit, 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, 81 first thermal fuse, 82 second thermal fuse, 112 heater section, 114 case, 116 axial core member, 118 coil spring, 120 case main body, 122 lid section, 124 coil spring, 130 outer flow path, 132 inner flow path, 134 grounding Electrode 140 water-conducting member PS power supply WS water supply

Claims (4)

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 the other end of the heater and the second power supply terminal, a state in which the AC power is supplied to the heater and a state in which the supply of the AC power to the heater is stopped. 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;
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 a predetermined temperature or higher, a a first thermal fuse opening the power path between
provided on a power supply path between the other end of the heater and the second power supply terminal, and when the temperature of the heat exchanger reaches or exceeds a predetermined temperature, the other end of the heater and the second power supply terminal a second thermal fuse that opens the power path between
A sanitary washing device comprising: 2. The sanitary washing apparatus according to claim 1, wherein the heater section is provided between the first thermal fuse and the second thermal fuse. 3. The sanitary washing apparatus according to claim 1, wherein the first thermal fuse and the second thermal fuse are provided at different heights with respect to the heater section. 4. The sanitary cleaning device according to claim 3, wherein at least part of said second thermal fuse is provided at a point-symmetrical position with respect to at least part of said first thermal fuse with respect to the central axis of said heater part. Device.

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