JP2018193764A - Sanitary washing device - Google Patents

Abstract

An object of the present invention is to further improve the reliability of a safety circuit for preventing high-temperature washing water from being accidentally ejected from a washing nozzle of a sanitary washing device. A sanitary washing device includes a washing nozzle that ejects washing water to a local part of a human body, a valve that permits supply of washing water to the washing nozzle and regulates supply of washing water to the washing nozzle, A heater that heats water, a temperature detector that outputs a signal corresponding to a temperature of the cleaning water supplied to the cleaning nozzle, and a control device that controls a valve, wherein the control device is supplied to the cleaning nozzle. Creates a safety circuit that prohibits valve opening so that the supply of cleaning water to the cleaning nozzle is regulated in accordance with the temperature of the cleaning water, and creates a state in which the safety circuit prohibits valve opening and opens the valve. An abnormality diagnosis unit that diagnoses whether there is an abnormality in the safety circuit based on a supply state of the cleaning water to the cleaning nozzle when a valve command is given. [Selection diagram] FIG.

Description

  The invention of the present disclosure relates to a sanitary washing device including a washing nozzle that ejects washing water to a local part of a human body.

  Conventionally, as this type of sanitary washing device, a heat exchange device that has a water pipe supplied from a water supply source and a heater disposed in the pipe and instantaneously directly heats the water, and the heat exchange device A device including a nozzle unit that discharges hot water heated by the heat to a local part of a human body is known (for example, see Patent Document 1). Thus, by instantaneously directly heating the cleaning water sprayed to the local part of the human body, energy loss due to heat radiation can be reduced, and the hot water storage tank can be eliminated to downsize the entire apparatus.

JP 2001-132061 A

  In the sanitary washing apparatus as described above, in order to prevent high temperature washing water from being accidentally ejected from the nozzle unit while ensuring space saving, the washing water is supplied to the nozzle unit according to the temperature of the washing water. It is preferable to provide a safety circuit (hardware circuit) to be regulated. Further, when such a safety circuit is provided in the sanitary washing apparatus, it is required to sufficiently ensure the reliability of the safety circuit.

  Therefore, the main object of the present disclosure is to further improve the reliability of a safety circuit that prevents high-temperature washing water from being accidentally ejected from the washing nozzle.

  The sanitary washing device of the present disclosure includes a washing nozzle that ejects washing water to a local part of a human body, a valve that allows the washing water to be supplied to the washing nozzle and regulates the supply of the washing water to the washing nozzle. In the sanitary washing apparatus, comprising: a heater for heating the washing water; a temperature detector that outputs a signal corresponding to a temperature of the washing water supplied to the washing nozzle; and a control device that controls the valve; A safety circuit that prohibits the valve from opening so that the supply of the cleaning water to the cleaning nozzle is regulated according to the temperature of the cleaning water supplied to the cleaning nozzle; and the safety circuit Creates a state in which the valve is prohibited from being opened, and diagnoses whether there is an abnormality in the safety circuit based on the supply state of the washing water to the washing nozzle side when the valve opening command is given to the valve It is intended and a cross section.

  The control device of the sanitary washing device includes a safety circuit that prohibits the valve from opening so that the supply of the wash water to the wash nozzle is regulated according to the temperature of the wash water supplied to the wash nozzle, and the safety circuit And an abnormality diagnosing unit for diagnosing whether or not the circuit is abnormal. Then, the abnormality diagnosis unit creates a state in which the safety circuit prohibits the valve from being opened, and whether or not there is an abnormality in the safety circuit based on the supply state of the washing water to the washing nozzle when the valve opening command is given to the valve Diagnose. In this way, it is possible to further improve the reliability of the safety circuit by deliberately creating a state in which the safety circuit prohibits valve opening and performing abnormality diagnosis of the safety circuit. Note that the cleaning water supplied to the cleaning nozzle side in connection with the abnormality diagnosis of the safety circuit may be discharged from the cleaning nozzle or may be discharged from a dedicated discharge unit.

  Further, the abnormality diagnosis unit creates a state in which the safety circuit allows the valve to open before the abnormality diagnosis of the safety circuit in a state in which the safety circuit prohibits the valve from opening, The presence or absence of an abnormality in the safety circuit may be diagnosed based on a supply state of the cleaning water to the cleaning nozzle when a valve opening command is given to the valve. Thereby, since the presence or absence of abnormality of the safety circuit can be diagnosed with higher accuracy, the reliability of the safety circuit can be further improved.

  Furthermore, the safety circuit includes a comparator that outputs a signal corresponding to a difference between the signal from the temperature detector and a reference signal, and an on / off circuit that allows or prohibits the valve from opening according to the signal from the comparator. May be included. Accordingly, it is possible to easily configure a safety circuit that restricts the supply of the cleaning water to the cleaning nozzle by prohibiting the opening of the valve when the cleaning water becomes high temperature. Then, the safety circuit gives a valve opening command to the valve in a state in which the valve is allowed to open, and the safety circuit gives the valve opening command to the valve in a state in which the valve is prohibited from being opened. Based on the supply state, it is possible to accurately diagnose whether there is an abnormality in the comparator and the on / off circuit.

  In addition, the abnormality diagnosis unit may create a state in which the safety circuit prohibits the valve from opening by raising the temperature of the cleaning water by the heater so that the output of the comparator is inverted.

  Furthermore, the heater may be an instantaneous heating heater that heats the cleaning water supplied from the valve to the cleaning nozzle. This makes it possible to improve energy efficiency while reducing the size of the sanitary washing device.

  In addition, the safety circuit may include a voltage dividing circuit that switches a voltage of the reference signal supplied to the comparator, and the abnormality diagnosis unit outputs the voltage of the reference signal supplied to the comparator. By changing the pressure circuit, the safety circuit may create a state in which the valve is prohibited from opening. Thereby, it is possible to execute abnormality diagnosis of the safety circuit without operating the heater.

  Further, the sanitary washing device may include two temperature detectors, and the safety circuit is connected to the two comparators connected to the corresponding temperature detectors and to the corresponding comparators, respectively. Two on / off circuits and a third on / off circuit that is on / off controlled by the control device may be included, and the opening of the valve is permitted by the two on / off circuits in response to signals from the two comparators. The valve may be opened when the third on / off circuit is turned on by the control device in a closed state. This makes it possible to make the sanitary washing device redundant.

  The sanitary washing device may further include a flow sensor that detects a flow rate of the washing water supplied from the valve to the washing nozzle, and the abnormality diagnosis unit gives a valve opening command to the valve. The presence or absence of abnormality of the safety circuit may be diagnosed based on the detected value of the flow rate sensor. As a result, when a valve opening command is given to the valve for diagnosing whether there is an abnormality in the safety circuit, the supply state of the cleaning water to the cleaning nozzle side, that is, whether or not the cleaning water is supplied to the cleaning nozzle side. It becomes possible to discriminate accurately.

  Further, the abnormality diagnosis unit obtains a temperature gradient of the cleaning water based on a signal from the temperature detector after giving a valve opening command to the valve, and the safety circuit based on the acquired temperature gradient The presence or absence of abnormalities may be diagnosed. That is, by acquiring the temperature gradient of the cleaning water after giving the valve opening command to diagnose whether there is an abnormality in the safety circuit, the cleaning water is supplied to the cleaning nozzle side based on the temperature gradient. It becomes possible to accurately determine the state, that is, whether or not the cleaning water is supplied to the cleaning nozzle side.

  In addition, the abnormality diagnosis unit determines whether or not there is a user of the toilet bowl in which the sanitary washing device is installed, and performs an abnormality diagnosis of the safety circuit when determining that the toilet bowl is not used. Good.

It is a perspective view which shows the toilet bowl to which the sanitary washing apparatus of this indication was attached. It is a schematic block diagram of the sanitary washing apparatus of this indication. It is a flowchart which shows an example of the abnormality diagnosis routine performed in the sanitary washing apparatus of this indication. It is a flowchart which shows the other example of the abnormality diagnosis routine performed in the sanitary washing apparatus of this indication. It is a principal part enlarged view of the other safety circuit applicable to the sanitary washing apparatus of this indication. It is a flowchart which shows the further another example of the abnormality diagnosis routine performed in the sanitary washing apparatus of this indication.

  Next, embodiments for carrying out the invention of the present disclosure will be described with reference to the drawings.

  FIG. 1 is a perspective view illustrating a toilet 1 to which a sanitary washing device 10 according to the present disclosure is attached, and FIG. 2 is a schematic configuration diagram of the sanitary washing device 10. A toilet bowl 1 shown in FIG. 1 is a Western-style toilet bowl, and a sanitary washing device 10 is fixed to the upper surface of the toilet bowl 1. As shown in FIG. 1, the sanitary washing device 10 includes a casing 11, a toilet seat 12 that is rotatably supported by the casing 11, and a toilet lid that is rotatably supported by the casing 11 similarly to the toilet seat 12. 13, an operation panel 14, and a cleaning nozzle 15 that ejects cleaning water (water or hot water) to a local part of the human body. Furthermore, as shown in FIG. 2, the sanitary washing device 10 includes a water valve 16, a heat exchange unit 17, a flow rate sensor 18, a control device 20, and the like.

  The cleaning nozzle 15 includes a nozzle body having a first squirting outlet for butt washing, a second squirting outlet for bidet cleaning, and a waste water outlet, and the nozzle body is stored in the casing 11 and the toilet bowl of the toilet 1. And a drive mechanism for moving back and forth in the axial direction between the cleaning position on the part side. However, the sanitary washing device 10 may be provided with a buttocks washing nozzle and a bidet nozzle instead of the washing nozzle 15 having the first jet outlet for the buttocks washing and the second jet outlet for the bidet washing. In addition, the sanitary washing device 10 may be provided with a dedicated discharge unit for discharging the waste water. The water valve 16 is disposed in the casing 11 and is connected to a water supply pipe serving as a water source via a branch faucet, a water supply hose, and the like. In the present embodiment, the water valve 16 is an open / close valve that is driven by electric power from an AC power source or a DC power source, and allows the supply of cleaning water from the water source to the cleaning nozzle 15 and also allows the cleaning water to be supplied to the cleaning nozzle 15. Regulate the supply of

  The heat exchange unit 17 includes a heat exchange container 17a having a washing water inlet connected to the water valve 16 and a washing water outlet connected to the washing nozzle 15 via a rotary valve (not shown), and the inside of the heat exchange container 17a. And a heater 170 disposed on the surface. The heater 170 is an electric heater driven by electric power from an AC power source, and can instantaneously heat the cleaning water flowing into the heat exchange vessel 17a via the cleaning water inlet and flowing out of the cleaning water outlet. It is. By using the instantaneous heating type heater 170 as described above, it is possible to improve the energy efficiency by reducing the power consumption required for raising the temperature of the cleaning water while reducing the size of the sanitary washing device 10.

  The heat exchange unit 17 includes first and second temperature detectors 171 and 172 that can detect the temperature of the washing water in the heat exchange container 17a. In the present embodiment, the first and second temperature detectors 171 and 172 have a resistance whose resistance value decreases as the temperature rises, and the temperature of the cleaning water supplied to the cleaning nozzle 15 from the heat exchange container 17a. A positive temperature coefficient thermistor that outputs a corresponding voltage signal is used. However, the first and second temperature detectors 171 and 172 may be negative characteristic thermistors. In the present embodiment, the temperature detected by the first temperature detector 171 is used for controlling the heater 170 of the heat exchange unit 17, and the second temperature detector 172 is used as a backup temperature detector. .

  The flow rate sensor 18 detects the flow rate of the washing water supplied from the water valve 16 to the washing nozzle 15 (heat exchange unit 17) between the water valve 16 and the washing water inlet of the heat exchange unit 17. Further, the rotary valve provided between the cleaning nozzle 15 and the cleaning water outlet of the heat exchange container 17a is the first jet outlet for washing the bidet, the supply destination in the cleaning nozzle 15 of the cleaning water from the heat exchange container 17a. It can be selectively switched to either the second jet outlet for washing or the waste water outlet.

  The control device 20 of the sanitary washing device 10 is connected to a microcomputer (hereinafter referred to as “microcomputer”) 21 having a CPU, a ROM, a RAM, an input / output port, etc., not shown, and a heater 170 of the heat exchange unit 17. A heater control circuit 22, a flow rate sensor detection circuit 23 connected to the flow rate sensor 18, an open / close mechanism for the toilet seat 12 and the toilet lid 13, a drive mechanism for the washing nozzle 15, a plurality of drive circuits connected to a rotary valve, etc. An electronic control unit including (not shown) and the like. The control device 20 (microcomputer 21) includes an operation panel 14, a human body sensor (not shown), a seating sensor 19 (see FIG. 1), a seating switch (not shown) that is turned on in conjunction with the rotating hinge portion of the toilet seat 12. Signals from the first and second temperature detectors 171 and 172 of the heat exchange unit 17, the flow sensor 18 (flow sensor detection circuit 23), and the like are input. And the control apparatus 20 (microcomputer 21) produces | generates a control signal based on the signal etc. from the operation panel 14 or various sensors, and the toilet seat 12 and the toilet lid 13 of the toilet seat 12 and the like via the drive circuit and the heater control circuit 22 etc. It controls the opening / closing mechanism, the drive mechanism of the cleaning nozzle 15, the rotary valve, the heater 170 of the heat exchange unit 17, and the like.

  Further, the control device 20 is configured to regulate the supply of the cleaning water to the cleaning nozzle 15 according to the temperature of the cleaning water in the heat exchange container 17a of the heat exchange unit 17, that is, the cleaning water supplied to the cleaning nozzle 15. And a safety circuit 30 that can prohibit the opening of the water valve 16. As shown in FIG. 2, the safety circuit 30 is a hardware circuit including inverted first and second comparators 31 and 32 and first, second and third on / off circuits 33, 34 and 35. As the first to third on / off circuits 33-35, when the water valve 16 is an AC drive type, a circuit including a triac is used. When the water valve 16 is a DC drive type, a transistor (FET) is included. Is used.

  As shown in FIG. 2, the output terminal of the first temperature detector 171 of the heat exchange unit 17 is connected to the inverting input terminal of the first comparator 31, and the non-inverting input terminal of the first comparator 31 is connected to the inverting input terminal of the first comparator 31. A reference voltage (reference signal) is applied. The output terminal of the second temperature detector 172 of the heat exchange unit 17 is connected to the inverting input terminal of the second comparator 32, and the reference voltage (reference voltage) is connected to the non-inverting input terminal of the second comparator 32. Signal) is applied. As a result, the first and second comparators 31 and 32 are set to the high level from the output terminal until the voltage applied to the inverting input terminal from the first or second temperature detector 171 or 172 becomes higher than the reference voltage. When the voltage applied to the inverting input terminal becomes higher than the reference voltage, a low level signal is output from the output terminal.

  In the present embodiment, the reference voltage applied to the first and second comparators 31 and 32 is determined in advance as the temperature of the cleaning water in which the temperature of the cleaning water in the heat exchange container 17a should not be discharged from the cleaning nozzle 15. It is determined to be substantially the same as the voltage output from the first and second temperature detectors 171 and 172 when the reference temperature Tref is set (for example, about 45 ° C.). Therefore, when the temperature of the washing water in the heat exchange container 17a becomes equal to or higher than the reference temperature Tref, the voltage applied from the first or second temperature detectors 171 and 172 to the inverting input terminal becomes higher than the reference voltage. The first and second comparators 31 and 32 output a low level signal from the output terminal.

  The output terminal of the first comparator 31 is connected to a first on / off circuit 33 as shown in FIG. The first on / off circuit 33 is turned on while the signal from the first comparator 31 is at a high level, and is turned off when the signal from the first comparator 31 is at a low level. The output terminal of the second comparator 32 is connected to the second on / off circuit 34. The second on / off circuit 34 is turned on while the signal from the second comparator 32 is at a high level, and is turned off when the signal from the second comparator 32 is at a low level. Further, the third on / off circuit 35 is connected to the microcomputer 21 and is controlled to be turned on / off by the microcomputer 21.

  Therefore, when the third on / off circuit 35 is turned on by the microcomputer 21 when the signals from the first and second comparators 31 and 32 are at a high level, all of the first to third on / off circuits 33-35 are turned on. The water valve 16 is opened by supplying power through the first to third on / off circuits 33-35. As a result, the cleaning water from the water valve 16 can be supplied to the cleaning nozzle 15 via the heat exchange unit 17, and the cleaning water can be ejected from the cleaning nozzle 15 to a local part of the human body. Further, when at least one of the first and second comparators 31 and 32 is at a low level, even if the third on / off circuit 35 is turned on by the microcomputer 21, the first and second on / off circuits 33. , 34 is turned off, the power supply to the water valve 16 is cut off, and the opening of the water valve 16 is prohibited. As a result, when the washing water in the heat exchange container 17a of the heat exchange unit 17 becomes equal to or higher than the reference temperature Tref, the water valve 16 is prohibited from being opened, and the high temperature washing water is supplied to the washing nozzle 15, that is, the washing nozzle. It becomes possible to regulate the ejection of hot washing water from 15.

  As described above, the heat exchange unit 17 is provided with the two temperature detectors 171, 172, and the safety circuit 30 is configured by the first and second comparators 31, 32 and the first to third on / off circuits 33-35. Therefore, it becomes possible to make the sanitary washing device 10 redundant. However, there is a possibility that some abnormality may occur in the safety circuit 30 itself. When the microcomputer 21 malfunctions in a state where the abnormality is occurring in the safety circuit 30, high-temperature washing water is ejected from the washing nozzle 15. There is also a risk. For this reason, in the sanitary washing device 10, the abnormality diagnosis of the safety circuit 30 is executed by the microcomputer 21 as the abnormality diagnosis unit of the control device 20.

  FIG. 3 is a flowchart showing an example of an abnormality diagnosis routine executed by the microcomputer 21 of the control device 20. The abnormality diagnosis routine shown in the figure is executed by the microcomputer 21 every predetermined time.

  At the start of the abnormality diagnosis routine of FIG. 3, the microcomputer 21 (CPU) determines the presence / absence of a user of the toilet 1 based on signals from a human body sensor (not shown), a seating sensor 19, a seating switch, and the like (step S100). . When it is determined that there is a user of the toilet 1 (step S110: NO), the microcomputer 21 once ends the routine, and executes the routine again when the predetermined time has elapsed. Moreover, when it determines with the user of the toilet bowl 1 not existing in step S110 (step S110: YES), the microcomputer 21 acquires the temperature Tw of the wash water detected by the 1st temperature detector 171 ( Step S120), it is determined whether or not the acquired cleaning water temperature Tw is lower than the reference temperature Tref (step S130). When it is determined in step S130 that the temperature Tw of the cleaning water is equal to or higher than the reference temperature Tref (step S130: NO), the microcomputer 21 once ends this routine, and again executes this routine after the predetermined time has elapsed. Run.

  If it is determined in step S130 that the temperature Tw of the cleaning water is lower than the reference temperature Tref (step S130: YES), the microcomputer 21 blinks at least one lamp provided on the operation panel 14 and performs abnormality diagnosis processing. In order to indicate that it is being executed, a lamp blinking command is transmitted to a control unit (not shown) of the operation panel 14 (step S140). When the control unit of the operation panel 14 receives a lamp blink command from the microcomputer 21, the control unit blinks the corresponding lamp and prohibits acceptance of the operation of the operation panel 14. After the processing in step S140, the microcomputer 21 outputs a valve opening command for the water valve 16, that is, an on signal for turning on the third on / off circuit 35 (step S150). In step S150, the microcomputer 21 controls the rotary valve so that the supply destination of the cleaning water from the heat exchange container 17a becomes the waste water discharge port of the cleaning nozzle 15. Further, the microcomputer 21 determines that the signal from the flow sensor 18 is in the ON state when a predetermined time (time required for opening the water valve 16) has elapsed since the output of the ON signal to the third ON / OFF circuit 35. It is determined whether or not (step S160).

  When the ON signal is output from the microcomputer 21 to the third ON / OFF circuit 35 in step S150 after it is determined in step S130 that the temperature Tw of the cleaning water is lower than the reference temperature Tref, the first and the first safety circuit 30 If an abnormality occurs in at least one of the second comparators 31, 32 and the first to third on / off circuits 33-35, one of the first to third on / off circuits 33-35 is not turned on. become. In this case, the water valve 16 does not open because power is not supplied, and the cleaning water is not supplied from the water valve 16 to the cleaning nozzle 15 (heat exchange container 17a). That is, when it is determined in step S160 that the signal from the flow sensor 18 is not in the ON state (step S160: NO), the temperature Tw of the cleaning water in the heat exchange container 17a is less than the reference temperature Tref. Even though the safety circuit 30 (the first and second comparators 31 and 32) permits the water valve 16 to open, the water valve 16 opens in response to the ON signal from the microcomputer 21. Will not be.

  For this reason, when a negative determination is made in step S160 (step S160: NO), the microcomputer 21 considers that an abnormality has occurred in the safety circuit 30, and for example, the lamps on the operation panel 14 are all blinked to perform sanitary washing. In order to indicate that an abnormality has occurred in the device 10 (safety circuit 30), an abnormal state display command is transmitted to the control unit of the operation panel 14 (step S230), and this routine is terminated. The microcomputer 21 prohibits the operation of the sanitary washing device 10 after transmitting the abnormal state display command. When the control unit of the operation panel 14 receives an abnormal state display command from the microcomputer 21, the control unit blinks the corresponding lamp and prohibits the reception of the operation of the operation panel 14.

  On the other hand, if it is determined in step S160 that the signal from the flow sensor 18 is in the on state (step S160: YES), the water valve 16 is opened in response to the output of the on signal from the microcomputer 21. Then, the cleaning water is supplied from the water valve 16 to the cleaning nozzle 15, and the cleaning water is discharged into the toilet 1 from the waste water discharge port of the cleaning nozzle 15. That is, when an affirmative determination is made in step S160, the temperature Tw of the cleaning water in the heat exchange container 17a is lower than the reference temperature Tref, and the safety circuit 30 (first and second comparators 31 and 32) is connected to the water valve 16. The water valve 16 is opened by the microcomputer 21 in a state in which the opening of the valve is permitted.

  If an affirmative determination is made in step S160 (step S160: YES), the microcomputer 21 closes the water valve 16 to close the water valve 16, that is, turns off the third on / off circuit 35. A signal is output (step S170). Next, the microcomputer 21 operates (turns on) the heater 170 of the heat exchange unit 17 so that the temperature Tw of the cleaning water in the heat exchange container 17a becomes equal to or higher than the reference temperature Tref, and then stops the heater 170 ( Step S180). Further, after the processing in step S180, the microcomputer 21 outputs a valve opening command for the water valve 16, that is, an on signal for turning on the third on / off circuit 35 (step S190). In step S150, the microcomputer 21 controls the rotary valve so that the supply destination of the cleaning water from the heat exchange container 17a becomes the discarded water discharge port. Then, the microcomputer 21 determines that the signal from the flow sensor 18 is in the OFF state when a predetermined time (time required for opening the water valve 16) has elapsed since the output of the ON signal to the third ON / OFF circuit 35. It is determined whether or not (step S200).

  If the microcomputer 170 outputs an on signal to the third on / off circuit 35 in step S190 after operating the heater 170 in step S180 to raise the temperature Tw of the cleaning water to the reference temperature Tref or higher, the first and If the second comparators 31 and 32 are normal, the first and second on / off circuits 33 and 34 are turned off by outputting a low level signal from the output terminals of the first and second comparators 31 and 32. . In this case, even if an on signal is output from the microcomputer 21 to the third on / off circuit 35, the water valve 16 does not open because the first and second on / off circuits 33 and 34 are off, and the water valve 16 No cleaning water is supplied to the cleaning nozzle 15 (heat exchange container 17a). That is, when it is determined in step S200 that the signal from the flow sensor 18 is in an off state (step S200: YES), the first and second are increased according to the temperature rise of the cleaning water in the heat exchange container 17a. Since the comparators 31 and 32 (safety circuit 30) prohibit the opening of the water valve 16, the water valve 16 is not opened.

  Therefore, when an affirmative determination is made in step S200 (step S200: YES), the microcomputer 21 regards that no abnormality has occurred in the safety circuit 30, and the valve closing command for the water valve 16, that is, the third on / off circuit. An off signal for turning off 35 is output (step S210). Further, the microcomputer 21 transmits a lamp turn-off command to the control unit of the operation panel 14 in order to end the blinking display of the lamp on the operation panel 14 (step S220), and ends this routine.

  On the other hand, if it is determined in step S200 that the signal from the flow sensor 18 is on (step S200: NO), the water valve 16 is opened in response to the output of the on signal from the microcomputer 21. Then, the cleaning water is supplied from the water valve 16 to the cleaning nozzle 15, and the cleaning water is discharged into the toilet 1 from the waste water discharge port of the cleaning nozzle 15. That is, if a negative determination is made in step S200, the temperature Tw of the cleaning water in the heat exchange container 17a is equal to or higher than the reference temperature Tref, and the first and second comparators 31 and 32 (safety circuit 30) are originally water valves. Although the opening of the valve 16 should be prohibited, the microcomputer 21 can open the water valve 16.

  For this reason, when a negative determination is made in step S200 (step S200: NO), the microcomputer 21 considers that an abnormality has occurred in the safety circuit 30 (first and second comparators 31 and 32), and the operation panel. An abnormal state display command is transmitted to the control unit 14 (step S230), and this routine is terminated. Also in this case, the microcomputer 21 prohibits the operation of the sanitary washing device 10 after transmitting the abnormal state display command. When the control unit of the operation panel 14 receives an abnormal state display command from the microcomputer 21, the control unit blinks the corresponding lamp and prohibits the reception of the operation of the operation panel 14.

  As described above, the control device 20 of the sanitary cleaning device 10 controls the water valve 16 so that the supply of the cleaning water to the cleaning nozzle 15 is regulated according to the temperature Tw of the cleaning water supplied to the cleaning nozzle 15. It includes a safety circuit 30 that prohibits valve opening and a microcomputer 21 as an abnormality diagnosis unit that executes the abnormality diagnosis routine of FIG. 3 and diagnoses the presence or absence of abnormality of the safety circuit 30. Then, the microcomputer 21 raises the temperature Tw of the cleaning water in the heat exchange container 17a by the heater 170 of the heat exchange unit 17 so that the outputs of the first and second comparators 31 and 32 are reversed, so that the safety circuit 30 The cleaning nozzle when the (first and second comparators 31 and 32) create a state in which the water valve 16 is prohibited from being opened and gives a valve opening command (an ON signal to the third ON / OFF circuit 35) to the water valve 16. The presence / absence of abnormality of the safety circuit 30 is diagnosed based on the supply state of the wash water to the 15 side (steps S180 to S200 in FIG. 3). As described above, the reliability of the safety circuit 30 can be further improved by deliberately creating a state in which the safety circuit 30 prohibits the water valve 16 from being opened and performing abnormality diagnosis of the safety circuit 30.

  Further, the microcomputer 21 creates a state in which the safety circuit 30 allows the water valve 16 to be opened prior to the abnormality diagnosis (steps S180 to S200) in a state where the safety circuit 30 prohibits the water valve 16 from being opened. (Steps S100-S130), based on the supply state of the cleaning water to the cleaning nozzle 15 when the valve opening command (ON signal to the third ON / OFF circuit 35) is given to the water valve 16, The presence or absence is diagnosed (steps S150 and S160). Thereby, since the presence or absence of abnormality of the safety circuit 30 can be diagnosed with higher accuracy, the reliability of the safety circuit 30 can be further improved.

  Furthermore, the safety circuit 30 includes first and second comparators 31 and 32 that output a signal corresponding to a difference between the voltage signal from the first or second temperature detector 171 or 172 and the reference voltage, and the first or second comparator. 2 includes first and second on / off circuits 33 and 34 that permit or prohibit the opening of the water valve 16 in accordance with signals from the comparators 31 and 32. As a result, the safety circuit 30 that prohibits the opening of the water valve 16 and restricts the supply of the cleaning water to the cleaning nozzle 15 when the cleaning water becomes hot can be easily configured.

  In addition, the safety circuit 30 gives a valve opening command (ON signal to the third on / off circuit 35) to the water valve 16 in a state where the water valve 16 allows the water valve 16 to open (step S150). The valve opening command is given to the water valve 16 in a state in which the valve opening is prohibited (step S190), so that the first and second comparators 31 and 32 and the first comparator 32 and the second comparator 31 and 32 It is possible to accurately diagnose whether the first to third on / off circuits 33-35 are abnormal. The sanitary washing device 10 is provided with a flow rate sensor 18 for detecting the flow rate of the wash water supplied from the water valve 16 to the wash nozzle 15, so that the water valve 16 can be opened to diagnose whether there is an abnormality in the safety circuit 30. When the valve command is given, it is possible to accurately determine whether or not the cleaning water is supplied to the cleaning nozzle 15 side, that is, whether or not the cleaning water is supplied to the cleaning nozzle 15 side.

  However, the flow sensor 18 may be omitted from the sanitary washing device 10, and in this case, for example, the first temperature detection is performed after giving the valve opening command to the water valve 16 as in the abnormality diagnosis routine shown in FIG. A temperature gradient dT of the washing water is acquired based on the signal from the child 171 (steps S150, S155, S190, S195), and the presence or absence of abnormality of the safety circuit 30 may be diagnosed based on the acquired temperature gradient dT ( S165, S205).

  When the abnormality diagnosis routine shown in FIG. 4 is executed, the microcomputer 21 transmits a lamp blinking command to the control unit of the operation panel 14 in step S140, and then the temperature Tw of the cleaning water in the heat exchange container 17a is changed to the water valve. The heater 170 of the heat exchange unit 17 is operated (turned on) so as to be higher than the temperature Tw_in of the cleaning water supplied to 16 and lower than the reference temperature Tref, and then the heater 170 is stopped (step S145). . That is, in step S145, the temperature Tw of the cleaning water in the heat exchange container 17a is increased while maintaining the state in which the safety circuit 30 (the first and second comparators 31 and 32) allows the water valve 16 to open. . In addition, the microcomputer 21 gives a valve opening command (ON signal to the third on / off circuit 35) to the water valve 16 in step S150, and then the detected value of the first temperature detector 171 within a predetermined time. The absolute value of the change amount is acquired as the temperature gradient dT (step S155). Further, the microcomputer 21 determines whether or not the acquired temperature gradient dT is equal to or greater than a predetermined first threshold value dT1 (positive value) (step S165).

  When the water valve 16 is opened in response to the output of the ON signal from the microcomputer 21 in step S150, the cleaning water flows into the heat exchange container 17a from the water valve 16, thereby cleaning the heat exchange container 17a. The water temperature Tw rapidly decreases, and the temperature gradient dT acquired from the detection value of the first temperature detector 171 becomes a relatively large value. If the water valve 16 does not open in response to the output of the ON signal from the microcomputer 21 in step S150 even though the safety circuit 30 allows the water valve 16 to open, the water valve Since no washing water flows into the heat exchange container 17a from 16, the temperature Tw of the washing water detected by the first temperature detector 171 hardly changes, and the temperature gradient dT becomes a value close to zero. For this reason, when it is determined in step S165 that the temperature gradient dT is less than the first threshold value dT1 (step S165: NO), the microcomputer 21 regards that an abnormality has occurred in the safety circuit 30, and the step S230 The processing is executed to end the routine of FIG.

  On the other hand, when it determines with the temperature gradient dT being more than 1st threshold value dT1 in step S165 (step S165: YES), the microcomputer 21 performs the process after the above-mentioned step S170. That is, the microcomputer 21 operates the heater 170 in step S180 to raise the temperature Tw of the cleaning water to the reference temperature Tref or more, and creates a state in which the safety circuit 30 prohibits the water valve 16 from being opened. Further, the microcomputer 21 gives a valve opening command (ON signal to the third ON / OFF circuit 35) to the water valve 16 in step S190, and then the detected value of the first temperature detector 171 within a predetermined time. The absolute value of the change amount is acquired as the temperature gradient dT (step S195). Furthermore, the microcomputer 21 determines whether or not the acquired temperature gradient dT is less than a second threshold value dT0 (positive value) determined to be smaller than the first threshold value dT1, for example (step S205).

  If the water valve 16 does not open in response to the ON signal output from the microcomputer 21 in step S190, the wash water does not flow into the heat exchange vessel 17a from the water valve 16, so the first temperature detector 171 The temperature Tw of the detected washing water hardly changes, and the temperature gradient dT becomes a value close to zero. Further, when the water valve 16 is opened in response to the output of the ON signal from the microcomputer 21 in step S190 even though the safety circuit 30 prohibits the opening of the water valve 16, the water valve 16 As a result, the temperature Tw of the cleaning water in the heat exchange container 17a rapidly decreases, and the temperature gradient dT acquired from the detected value of the first temperature detector 171 is A relatively large value.

  For this reason, when it is determined in step S205 that the temperature gradient dT is equal to or greater than the second threshold value dT0 (step S205: NO), the microcomputer 21 causes an abnormality in the safety circuit 30 (first and second comparators 31 and 32). Is generated, the process of step S230 is executed, and the routine of FIG. 4 is terminated. If it is determined in step S205 that the temperature gradient dT is less than the second threshold value dT0 (step S205: YES), the microcomputer 21 regards that no abnormality has occurred in the safety circuit 30, and steps S210 and S220. The process of FIG. 4 is terminated by executing the process. In this way, by acquiring the temperature gradient dT of the wash water after giving the valve opening command to the water valve 16 in order to diagnose the presence or absence of an abnormality in the safety circuit 30, the washing nozzle is obtained based on the temperature gradient dT. It is possible to accurately determine whether or not the cleaning water is supplied to the 15 side, that is, whether or not the cleaning water is supplied to the cleaning nozzle 15 side.

  FIG. 5 is an enlarged view of a main part of another safety circuit 30B applicable to the control device 20 of the sanitary washing device 10. A safety circuit 30B shown in the figure is used together with first and second temperature detectors 171 and 172 that are positive characteristic thermistors, and is a voltage level of a reference voltage (reference signal) applied to the first comparator 31. And a second voltage dividing circuit 320 for switching a voltage level of a reference voltage (reference signal) applied to the second comparator 32. The first and second voltage dividing circuits 310 and 320 have switching elements that are controlled to be turned on / off by the microcomputer 21, and when the switching elements are turned on, the first or second voltage dividing circuits 310 and 320 reduce the resistance value on the ground side. (2) The reference voltage applied to the comparators 31 and 32 is reduced by resistance voltage division. In the example of FIG. 5, the first and second voltage dividing circuits 310 and 320 use the first and second voltage dividing circuits 310 and 320 as the reference voltage when the switching element is turned off and the temperature Tw of the cleaning water is the reference temperature Tref. The voltage output from the two temperature detectors 171 and 172 is set substantially the same. The first and second voltage dividing circuits 310 and 320 use the first and second temperature detectors 171 as the reference voltage when the switching element is turned on and the temperature Tw of the cleaning water is 0 ° C., for example. , 172 are set to be substantially the same as the voltage output from 172. However, negative characteristic thermistors may be used as the first and second temperature detectors 171 and 172. In this case, when the switching elements are turned on as the first and second voltage dividing circuits 310 and 320, What is necessary is just to use what reduces the reference voltage applied to the 1st or 2nd comparators 31 and 32 by resistance voltage division.

  When the safety circuit 30B having such first and second voltage dividing circuits 310 and 320 is provided in the control device 20, as shown in FIG. 6, the valve opening command ( After applying the ON signal to the third ON / OFF circuit 35), the switching elements of the first and second voltage dividing circuits 310 and 320 are turned ON to lower the reference voltage applied to the first and second comparators 31 and 32. (Step S185). Thus, if the first and second comparators 31 and 32 are normal, even if the temperature Tw of the cleaning water in the heat exchange container 17a is lower than the reference temperature Tref, the first and second comparators 31 and 32 Since the output can be inverted, the first and second on / off circuits 33 and 34 can be turned off to create a state in which the safety circuit 30 prohibits the water valve 16 from opening. As a result, the abnormality diagnosis of the safety circuit 30 (first and second comparators 31 and 32) can be performed without operating the heater 170 of the heat exchange unit 17. Then, as shown in FIG. 6, after the abnormality diagnosis of the safety circuit 30 is completed, the switching elements of the first and second voltage dividing circuits 310 and 320 are turned off and applied to the first and second comparators 31 and 32. What is necessary is just to return a reference voltage (step S215, S235).

  In the abnormality diagnosis routines of FIGS. 3, 4 and 6, it is determined that an abnormality has occurred in the safety circuits 30 and 30B when a negative determination is made in step S160, S165, S200, or S205. However, it may be determined that an abnormality has occurred in the safety circuits 30 and 30B when a negative determination is made a plurality of times in these steps S160, S165, S200, or S205. In the sanitary washing device 10, since the control device 20 inputs signals from the first and second temperature detectors 171 and 172 of the heat exchange unit 17, for example, after the execution of the processes of steps S 210 and S 215, etc. By comparing the detection values of the first and second temperature detectors 171 and 172, the presence or absence of abnormality of the first and second temperature detectors 171 and 172 may be determined. In this case, if the difference between the detection values of the first and second temperature detectors 171 and 172 is a certain value or more, an abnormality has occurred in at least one of the first and second temperature detectors 171 and 172. Therefore, an abnormal state display command may be transmitted to the operation panel 14. Further, the abnormality diagnosis routines of FIGS. 3, 4 and 6 are provided with a heater or a temperature detector that heats water from a water pipe (water source) if the safety circuit as described above is provided in the control device. Etc. and may be executed in a water storage type sanitary washing apparatus provided with a washing water tank capable of storing hot water heated by the heater.

  And the invention of this indication is not limited to the above-mentioned embodiment at all, and it cannot be overemphasized that various changes can be made within the range of the extension of this indication. Furthermore, the above-described embodiment is merely a specific form of the invention described in the Summary of Invention column, and does not limit the elements of the invention described in the Summary of Invention column.

  The invention of the present disclosure can be used in the manufacturing industry of sanitary washing devices.

  1 toilet bowl, 10 sanitary washing device, 11 casing, 12 toilet seat, 13 toilet lid, 14 operation panel, 15 washing nozzle, 16 water valve, 17 heat exchange unit, 17a heat exchange container, 170 heater, 171 first temperature detector, 172 Second temperature detector, 18 Flow rate sensor, 19 Seat sensor, 20 Control device, 21 Microcomputer, 22 Heater control circuit, 23 Flow rate sensor detection circuit, 30, 30B Safety circuit, 31 First comparator, 32 Second comparator, 310 First voltage dividing circuit, 320 Second voltage dividing circuit, 33 First on / off circuit, 34 Second on / off circuit, 35 Third on / off circuit

Claims (10)

A cleaning nozzle that ejects cleaning water to a local part of a human body, a valve that allows the supply of the cleaning water to the cleaning nozzle and restricts the supply of the cleaning water to the cleaning nozzle, and a heater that heats the cleaning water A sanitary washing device including a temperature detector that outputs a signal corresponding to a temperature of the washing water supplied to the washing nozzle, and a control device that controls the valve;
The control device includes:
A safety circuit that prohibits the opening of the valve so that the supply of the cleaning water to the cleaning nozzle is regulated according to the temperature of the cleaning water supplied to the cleaning nozzle;
The safety circuit creates a state in which the valve is prohibited from opening, and whether or not the safety circuit is abnormal is determined based on the supply state of the cleaning water to the cleaning nozzle when a valve opening command is given to the valve. An abnormality diagnosis section to diagnose;
Sanitary washing device comprising. The sanitary washing device according to claim 1,
The abnormality diagnosis unit creates a state in which the safety circuit permits the valve to open before the abnormality diagnosis of the safety circuit in a state in which the safety circuit prohibits the valve opening. A sanitary washing apparatus for diagnosing the presence or absence of an abnormality in the safety circuit based on a supply state of the washing water to the washing nozzle when a valve opening command is given. The sanitary washing device according to claim 2,
The safety circuit includes a comparator that outputs a signal according to a difference between a signal from the temperature detector and a reference signal, and an on / off circuit that allows or prohibits the valve from opening according to the signal from the comparator. Including sanitary washing equipment. In the sanitary washing device according to claim 3,
The sanitary washing apparatus, wherein the abnormality diagnosis unit creates a state in which the safety circuit prohibits the valve from opening by raising the temperature of the washing water by the heater so that the output of the comparator is inverted.   5. The sanitary washing apparatus according to claim 4, wherein the heater is an instantaneous heating type heater that heats the washing water supplied from the valve to the washing nozzle. In the sanitary washing device according to claim 3,
The safety circuit has a voltage dividing circuit that switches a voltage of the reference signal supplied to the comparator,
The abnormality diagnosis unit is a sanitary washing device that creates a state in which the safety circuit prohibits opening of the valve by changing a voltage of the reference signal supplied to the comparator by the voltage dividing circuit. In the sanitary washing device according to any one of claims 3 to 6,
The sanitary washing device includes two temperature detectors,
The safety circuit includes two comparators connected to the corresponding temperature detectors, two on / off circuits connected to the corresponding comparators, and a third on / off controlled by the control device. Circuit and
When the third on / off circuit is turned on by the control device in a state in which the opening of the valve is permitted by the two on / off circuits in accordance with signals from the two comparators, the valve is opened. Sanitary washing device. In the sanitary washing device according to any one of claims 1 to 7,
The sanitary washing device further includes a flow rate sensor that detects a flow rate of the washing water supplied from the valve to the washing nozzle,
The said abnormality diagnosis part is a sanitary washing apparatus which diagnoses the presence or absence of abnormality of the said safety circuit based on the detected value of the said flow sensor when giving valve opening instruction | command to the said valve | bulb. In the sanitary washing device according to any one of claims 1 to 7,
The abnormality diagnosis unit obtains a temperature gradient of the cleaning water based on a signal from the temperature detector after giving a valve opening command to the valve, and an abnormality of the safety circuit based on the acquired temperature gradient Sanitary washing device that diagnoses the presence or absence of In the sanitary washing device according to any one of claims 1 to 9,
The abnormality diagnosis unit determines whether or not there is a user of a toilet with the sanitary washing device installed, and executes an abnormality diagnosis of the safety circuit when it is determined that the toilet is not used.

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