CN108951792B - Sanitary cleaning device - Google Patents
Sanitary cleaning device Download PDFInfo
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- CN108951792B CN108951792B CN201810474698.9A CN201810474698A CN108951792B CN 108951792 B CN108951792 B CN 108951792B CN 201810474698 A CN201810474698 A CN 201810474698A CN 108951792 B CN108951792 B CN 108951792B
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- valve
- washing
- safety circuit
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- temperature
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03D—WATER-CLOSETS OR URINALS WITH FLUSHING DEVICES; FLUSHING VALVES THEREFOR
- E03D9/00—Sanitary or other accessories for lavatories ; Devices for cleaning or disinfecting the toilet room or the toilet bowl; Devices for eliminating smells
- E03D9/08—Devices in the bowl producing upwardly-directed sprays; Modifications of the bowl for use with such devices ; Bidets; Combinations of bowls with urinals or bidets; Hot-air or other devices mounted in or on the bowl, urinal or bidet for cleaning or disinfecting
Abstract
The invention provides a sanitary washing device which further improves the reliability of a safety circuit for preventing a washing nozzle of the sanitary washing device from spurting high-temperature washing water by mistake. The sanitary washing device includes a washing nozzle for jetting washing water to a part of a human body, a valve for allowing the washing water to be supplied to the washing nozzle and limiting the supply of the washing water to the washing nozzle, a heater for heating the washing water, a temperature detector for outputting a signal corresponding to the temperature of the washing water supplied to the washing nozzle, and a control device for controlling the valve.
Description
Technical Field
The present invention relates to a sanitary washing apparatus including a washing nozzle for jetting washing water to a part of a human body.
Background
Conventionally, as such a sanitary washing apparatus, there has been known a sanitary washing apparatus including a heat exchange device which has a pipe line for water supplied from a water supply source and a heater disposed in the pipe line and can directly heat the water instantaneously, and a nozzle unit which ejects warm water heated by the heat exchange device to a part of a human body (for example, see patent document 1). Thus, the washing water discharged to the local part of the human body is instantaneously and directly heated, so that energy loss caused by heat release is reduced, and the hot water storage tank can be removed, thereby reducing the size of the whole device.
Patent document
Patent document 1: japanese patent laid-open No. 2001-132061
Disclosure of Invention
In the sanitary washing apparatus as described above, it is preferable to provide a safety circuit (hardware circuit) for controlling the supply of the washing water to the nozzle unit according to the temperature of the washing water in order to prevent the high-temperature washing water from being erroneously ejected from the nozzle unit while securing space saving. In addition, when such a safety circuit is provided in a sanitary washing apparatus, it is desirable to sufficiently ensure the reliability of the safety circuit.
Accordingly, a main object of the present invention is to further improve the reliability of a safety circuit for preventing high-temperature washing water from being erroneously ejected from a washing nozzle.
The sanitary washing device of the present invention comprises: a washing nozzle for jetting washing water to a part of a human body, a valve for allowing the washing water to be supplied to the washing nozzle and restricting the supply of the washing water to the washing nozzle, a heater for heating the washing water, a temperature detector for outputting a signal corresponding to the temperature of the washing water supplied to the washing nozzle, and a control unit for controlling the valve, wherein the control unit includes a safety circuit for prohibiting the valve from being opened based on the temperature of the washing water supplied to the washing nozzle to restrict the supply of the washing water to the washing nozzle, and an abnormality diagnosis unit for creating a state in which the valve is prohibited from being opened by the safety circuit and for controlling the supply of the washing water to the washing nozzle side based on a command for opening the valve issued by the safety circuit, the presence or absence of an abnormality in the safety circuit is diagnosed.
The control device of the sanitary washing device comprises a safety circuit and an abnormality diagnosis part, wherein the safety circuit prohibits the valve from opening according to the temperature of the washing water supplied to the washing nozzle so as to limit the supply of the washing water to the washing nozzle, and the abnormality diagnosis part diagnoses the existence of the abnormality of the safety circuit. The abnormality diagnosis unit creates a state in which the safety circuit prohibits the valve from being opened, and diagnoses the presence or absence of an abnormality in the safety circuit based on a supply state of the cleaning water to the cleaning nozzle side when an open command is issued to the valve. Thus, the safety circuit can be forcibly made to inhibit the valve from opening and the abnormality of the safety circuit can be diagnosed, thereby further improving the reliability of the safety circuit. The cleaning water supplied to the cleaning nozzle in association with the abnormality diagnosis of the safety circuit may be discharged from the cleaning nozzle or may be discharged from a dedicated discharge unit.
The abnormality detection unit may be configured to make a state in which the valve opening of the safety circuit is permitted before performing an abnormality diagnosis of the safety circuit in a state in which the valve opening of the valve is prohibited by the safety circuit, and diagnose the presence or absence of an abnormality of the safety circuit based on a state in which the cleaning water is supplied to the cleaning nozzle side when an opening command is given to the valve. This makes it possible to diagnose the presence or absence of an abnormality of the safety circuit with higher accuracy, and therefore, the reliability of the safety circuit can be further improved.
Further, the safety circuit may include a comparator that outputs a signal corresponding to a difference between the signal from the temperature detector and a reference signal, and a switch circuit (on-off circuit) that permits or prohibits opening of the valve based on the signal from the comparator. Thus, a safety circuit for preventing the valve from being opened when the washing water is at a high temperature and controlling the supply of the washing water to the washing nozzle can be easily formed. Further, by giving a valve opening command to the valve in a state where the safety circuit allows the valve to be opened and giving a valve opening command to the valve in a state where the safety circuit prohibits the valve from being opened, it is possible to diagnose the presence or absence of abnormality of the comparator and the switch circuit with high accuracy based on the supply state of the washing water.
The abnormality diagnosis unit may be configured to raise the temperature of the cleaning water by the heater to invert the output of the comparator, thereby making the safety circuit in a state in which the valve opening of the valve is prohibited.
Further, the heater may be an instantaneous heater that heats the washing water supplied from the valve to the washing nozzle.
The safety circuit may include a voltage divider circuit that switches a voltage of the reference signal supplied to the comparator, and the abnormality diagnosis unit may change the voltage of the reference signal supplied to the comparator by the voltage divider circuit to create a state in which the safety circuit prohibits the valve from being opened. Thus, the abnormality diagnosis of the safety circuit can be performed without activating the heater.
Further, the sanitary washing apparatus may include two of the temperature detectors, the safety circuit may include two of the comparators, two of the switch circuits, and a 3 rd switch circuit, the two of the comparators may be connected to the corresponding temperature detectors, the two of the switch circuits may be connected to the corresponding comparators, and the 3 rd switch circuit may be on-off controlled by the control device, or the valve may be opened if the 3 rd switch circuit is connected by the control device in a state where the valve is allowed to be opened by the two of the switch circuits based on signals from the two of the comparators. This makes it possible to achieve redundancy of the sanitary washing apparatus.
The sanitary washing apparatus 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 may diagnose the presence or absence of an abnormality in the safety circuit based on a detection value of the flow sensor when a valve opening command is given to the valve. Thus, when an open valve command is issued to the valve to diagnose the presence or absence of an abnormality in the safety circuit, the supply state of the washing water to the washing nozzle side, that is, whether or not the washing water has been supplied to the washing nozzle side can be recognized with high accuracy.
Further, the abnormality diagnosis unit may acquire a temperature gradient of the cleaning water based on a signal from the temperature detector after an open valve command is issued to the valve, and may diagnose the presence or absence of an abnormality of the safety circuit based on the acquired temperature gradient. That is, by obtaining the temperature gradient of the washing water after the valve opening command is issued to the valve in order to diagnose the presence or absence of the abnormality of the safety circuit, it is possible to accurately recognize the supply state of the washing water to the washing nozzle side, that is, whether the washing water has been supplied to the washing nozzle side or not, based on the temperature gradient.
The abnormality diagnosis unit may determine the presence or absence of a user of a toilet bowl provided with the sanitary washing apparatus, and when it is determined that the toilet bowl is not in use, perform abnormality diagnosis of the safety circuit.
Drawings
Fig. 1 is a perspective view showing a toilet stool to which a sanitary washing device according to the present invention is attached.
Fig. 2 is a schematic configuration view of the sanitary washing apparatus of the present invention.
Fig. 3 is a flowchart showing an example of an abnormality diagnosis routine executed in the sanitary washing apparatus of the present invention.
Fig. 4 is a flowchart showing another example of the abnormality diagnosis routine executed in the sanitary washing apparatus according to the present invention.
Fig. 5 is an enlarged view of a main portion of another safety circuit applicable to the sanitary washing device of the present invention.
Fig. 6 is a flowchart showing still another example of the abnormality diagnosis routine executed in the sanitary washing apparatus of the present invention.
Detailed Description
The following describes embodiments for carrying out the present invention with reference to the drawings.
Fig. 1 is a perspective view showing a toilet bowl 1 to which a sanitary washing apparatus 10 of the present invention is attached, and fig. 2 is a schematic configuration view of the sanitary washing apparatus 10. The toilet 1 shown in fig. 1 is a western style toilet, and a sanitary washing device 10 is fixed to an upper surface of the toilet 1. As shown in fig. 1, the sanitary washing apparatus 10 includes a casing 11, a toilet seat 12, a toilet lid 13, an operation panel 14, and a washing nozzle 15, wherein the toilet seat 12 is rotatably supported by the casing 11, the toilet lid 13 is rotatably supported by the casing 11 in the same manner as the toilet seat 12, and the washing nozzle 15 sprays washing water (water or warm water) to a part of a human body. Further, as shown in fig. 2, the sanitary washing apparatus 10 includes a water valve 16, a heat exchange unit 17, a flow sensor 18, a control device 20, and the like.
The cleaning nozzle 15 includes a nozzle body having a first discharge port 1 for washing buttocks, a second discharge port 2 for washing pudendum, and a waste water discharge port, and a driving mechanism for moving the nozzle body forward and backward in the axial direction between a storage position in the casing 11 and a cleaning position on the toilet bowl side of the toilet bowl 1. In the sanitary washing device 10, a buttocks washing nozzle and a pudendum washing nozzle may be provided instead of the washing nozzle 15 having the 1 st discharge port for buttocks washing and the 2 nd discharge port for pudendum washing. In addition, the sanitary washing apparatus 10 may be provided with a dedicated discharge portion for discharging the waste water. The water valve 16 is disposed in the housing 11 and connected to a tap water pipe as a water source via a branch tap, a water supply hose, and the like. In the present embodiment, the water valve 16 is a switch valve driven by power from an ac power supply or a dc power supply, and allows supply of washing water from a water source to the washing nozzle 15 and also restricts supply of washing water to the washing nozzle 15.
The heat exchange unit 17 includes a heat exchange container 17a and a heater 170, the heat exchange container 17a has 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 heater 170 is disposed inside the heat exchange container 17 a. The heater 170 is an electric heater driven by electric power from an ac power supply, and can instantaneously heat the washing water flowing into the heat exchange container 17a through the washing water inlet and flowing out of the washing water outlet. By using such an instantaneous heating type heater 170, the sanitary washing apparatus 10 can be downsized, and the energy efficiency can be improved by reducing the power consumption required for heating the washing water.
The heat exchange unit 17 includes the 1 st and 2 nd temperature detectors 171 and 172, and the 1 st and 2 nd temperature detectors 171 and 172 can detect the temperature of the washing water in the heat exchange container 17a, respectively. In the present embodiment, as the 1 st and 2 nd temperature detectors 171 and 172, positive temperature coefficient thermistors are used which have resistors whose resistance value decreases as the temperature increases and which output voltage signals corresponding to the temperature of the washing water supplied from the heat exchange container 17a to the washing nozzle 15. However, the 1 st and 2 nd temperature measuring devices 171 and 172 may be negative temperature coefficient thermistors. In addition, in the present embodiment, the temperature detected by the 1 st temperature detector 171 is used for control of the heater 170 and the like of the heat exchange unit 17, and the 2 nd temperature detector 172 is used as a backup temperature detector.
The flow sensor 18 is interposed between the water valve 16 and the washing water inlet of the heat exchanger unit 17, and detects the flow rate of the washing water supplied from the water valve 16 to the washing nozzle 15 (heat exchanger unit 17). The rotary valve provided between the washing nozzle 15 and the washing water outlet of the heat exchanger container 17a can selectively switch the supply destination of the washing water from the heat exchanger container 17a to any one of the first discharge port 1 for washing buttocks, the second discharge port 2 for washing pudendum, and the waste water discharge port.
The control device 20 of the sanitary washing apparatus 10 is an electronic control unit including a microcomputer (hereinafter referred to as "microcomputer") 21, a heater control circuit 22, a flow sensor detection circuit 23, a plurality of drive circuits (not shown), and the like, the microcomputer 21 having a CPU, a ROM, a RAM, an input/output port, and the like, all of which are not shown, the heater control circuit 22 being connected to the heater 170 of the heat exchange unit 17, the flow sensor detection circuit 23 being connected to the flow sensor 18, the plurality of drive circuits being connected to any one of the opening and closing mechanisms of the toilet seat 12 and the toilet lid 13, the drive mechanism of the washing nozzle 15, the rotary valve, and the like. The control device 20 (microcomputer 21) inputs signals from the operation panel 14, a human body sensor (not shown), the seating sensor 19 (see fig. 1), a seating switch (not shown) that is linked with and opened by a rotating hinge portion of the toilet seat 12, the 1 st and 2 nd temperature detectors 171 and 172 of the heat exchange unit 17, the flow sensor 18 (flow sensing circuit 23), and the like. Then, the control device 20 (microcomputer 21) generates control signals based on signals from the operation panel 14 and various sensors, and controls the opening and closing mechanism of the toilet seat 12 and the toilet lid 13, the driving mechanism of the cleaning nozzle 15, the rotary valve, the heater 170 of the heat exchange unit 17, and the like via the driving circuit, the heater control circuit 22, and the like.
Further, the control device 20 includes a safety circuit 30, and the safety circuit 30 can inhibit the opening of the water valve 16 and restrict the supply of the washing water to the washing nozzle 15 in accordance with the temperature of the washing water in the heat exchange container 17a of the heat exchange unit 17, that is, the washing water supplied to the washing nozzle 15. As shown in fig. 2, the safety circuit 30 is a hardware circuit including inversion type 1 st and 2 nd comparators 31 and 32 and 1 st, 2 nd and 3 rd switching circuits 33, 34 and 35. As the 1 st to 3 rd switching circuits 33 to 35, a circuit including a TRIAC (TRIAC) is used when the water valve 16 is of an alternating current drive type, and an element including a Transistor (Field Effect Transistor) is used when the water valve 16 is of a direct current drive type.
As shown in fig. 2, the output terminal of the 1 st temperature detector 171 of the heat exchange unit 17 is connected to the inverting input terminal of the 1 st comparator 31, and a reference voltage (reference signal) is applied to the non-inverting input terminal of the 1 st comparator 31. Further, the output terminal of the 2 nd temperature detector 172 of the heat exchanging unit 17 is connected to the inverting input terminal of the 2 nd comparator 32, and a reference voltage (reference signal) is applied to the non-inverting input terminal of the 2 nd comparator 32. Thus, the 1 st and 2 nd comparators 31 and 32 output a high-level signal from the output terminal until the voltage applied to the inverting input terminal by the 1 st or 2 nd temperature detectors 171 and 172 becomes higher than the reference voltage, and output a low-level signal from the output terminal if the voltage applied to the inverting input terminal is higher than the reference voltage.
In the present embodiment, the reference voltage applied to the 1 st and 2 nd comparators 31 and 32 is set to be substantially the same as the voltage output by the 1 st and 2 nd temperature detectors 171 and 172 when the temperature of the washing water in the heat exchange container 17a is a reference temperature Tref (for example, about 45 ℃), which is a temperature set in advance as the temperature of the washing water that should not be discharged from the washing nozzle 15. Therefore, if 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 1 st or 2 nd temperature detector 171, 172 to the inverting input terminal is higher than the reference voltage, and therefore the 1 st and 2 nd comparator 31, 32 outputs a low-level signal from the output terminal.
As shown in fig. 2, the output terminal of the 1 st comparator 31 is connected to the 1 st switching circuit 33. The 1 st switch circuit 33 is turned on while the signal from the 1 st comparator 31 is at a high level, and the 1 st switch circuit 33 is turned off when the signal from the 1 st comparator 31 becomes at a low level. Further, the output terminal of the 2 nd comparator 32 is connected to the 2 nd switching circuit 34. The 2 nd switching circuit 34 is turned on during the period when the signal from the 2 nd comparator 32 is at the high level, and the 2 nd switching circuit 34 is turned off when the signal from the 2 nd comparator 32 becomes the low level. The 3 rd switching circuit 35 is connected to the microcomputer 21, and on/off control is performed by the microcomputer 21.
Therefore, if the 3 rd switching circuit 35 is turned on by the microcomputer 21 when the signals from the 1 st and 2 nd comparators 31 and 32 are at a high level, the 1 st to 3 rd switching circuits 33 to 35 are all turned on, and the water valve 16 is opened by supplying power through the 1 st to 3 rd switching circuits 33 to 35. Thereby, the washing water from the water valve 16 is supplied to the washing nozzle 15 via the heat exchange unit 17, and the washing water is discharged from the washing nozzle 15 to a part of the human body. When the signal of at least one of the 1 st and 2 nd comparators 31 and 32 is at a low level, even if the 3 rd switching circuit 35 is turned on by the microcomputer 21, at least one of the 1 st and 2 nd switching circuits 33 and 34 is turned off, and therefore, the power supply to the water valve 16 is cut off, and the water valve 16 is prohibited from opening. As a result, when the washing water in the heat exchange container 17a of the heat exchange unit 17 is equal to or higher than the reference temperature Tref, the opening of the water valve 16 is prohibited, and the supply of the high-temperature washing water to the washing nozzle 15, that is, the ejection of the high-temperature washing water from the washing nozzle 15 can be restricted.
In this way, the two temperature detectors 171 and 172 are provided in the heat exchange unit 17, and the 1 st and 2 nd comparators 31 and 32 and the 1 st to 3 rd switching circuits 33 to 35 constitute the safety circuit 30, whereby redundancy (redundancy) of the sanitary washing apparatus 10 can be achieved. However, some abnormality may occur in the safety circuit 30 itself, and in the case where the microcomputer 21 is operated erroneously in a state where the safety circuit 30 is abnormal, high-temperature washing water may be discharged from the washing nozzle 15. Therefore, in the sanitary washing apparatus 10, the abnormality diagnosis of the safety circuit 30 is performed by the microcomputer 21 as the abnormality diagnosis section 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 program shown in the same figure is a program executed by the microcomputer 21 at predetermined time intervals.
When the abnormality diagnosis routine of fig. 3 is started, the microcomputer 21(CPU) determines the presence or absence of a user of the toilet 1 based on signals from the human body sensor, the seating sensor 19, the seating switch, and the like (step S100). When the microcomputer 21 judges that the user of the toilet 1 is present (step S110: NO), the program is once terminated, and the program is executed again at the stage when the predetermined time has elapsed. When it is determined in step S110 that there is no user of the toilet 1 (YES in step S110), the microcomputer 21 acquires the temperature Tw of the washing water detected by the 1 st temperature detector 171 (step S120), and determines whether or not the acquired temperature Tw of the washing water is lower than the reference temperature Tref (step S130). When it is judged in step S130 that the temperature Tw of the washing water is not lower than the reference temperature Tref (step S130: NO), the microcomputer 21 once terminates the present routine and executes the present routine again at a stage after the lapse of the predetermined time.
When it is determined in step S130 that the temperature Tw of the washing water is lower than the reference temperature Tref (YES in step S130), the microcomputer 21 transmits a lamp blinking command to a control unit (not shown) of the operation panel 14 (step S140), and blinks at least one lamp provided on the operation panel 14 to indicate that the abnormality diagnosis process is being performed. If the control section of the operation panel 14 receives a lamp blinking instruction from the microcomputer 21, the control section causes the corresponding lamp to blink, and at the same time, prohibits the reception of the operation panel 14. After the processing in step S140, the microcomputer 21 outputs an open valve command of the water valve 16, that is, a connection signal for connecting the 3 rd switching 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 whether or not the signal from the flow sensor 18 is in the ON state at a time when a predetermined time (time required to open the water valve 16) has elapsed since the communication signal was output to the 3 rd switching circuit 35 (step S160).
After determining that the temperature Tw of the washing water is lower than the reference temperature Tref in step S130, a connection signal is outputted from the microcomputer 21 to the 3 rd switching circuit 35 in step S150, and at this time, if at least one of the 1 st and 2 nd comparators 31 and 32 and the 1 st to 3 rd switching circuits 33 to 35 of the safety circuit 30 is abnormal, any one of the 1 st to 3 rd switching circuits 33 to 35 is not connected. In this case, since no electric power is supplied, the water valve 16 will not be opened, and therefore the cleaning water is not supplied from the water valve 16 to the cleaning nozzle 15 (heat exchange container 17 a). 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 water valve 16 is not opened in response to the communication signal from the microcomputer 21, although the temperature Tw of the washing water in the heat exchange container 17a is lower than the reference temperature Tref and the safety circuit 30 (1 st and 2 nd comparators 31 and 32) allows the water valve 16 to be opened.
Therefore, if a negative determination is made in step S160 (step S160: NO), the microcomputer 21 regards the occurrence of an abnormality in the safety circuit 30 as being a case, and transmits an abnormal state indication command to the control unit of the operation panel 14 (step S230) to indicate that an abnormality has occurred in the sanitary washing apparatus 10 (safety circuit 30) by flashing all the lamps of the operation panel 14, for example, and the routine is terminated. After the microcomputer 21 transmits the abnormal state indicating command, the operation of the sanitary washing apparatus 10 is prohibited. Further, if the control section of the operation panel 14 receives an abnormal state indicating instruction from the microcomputer 21, it causes the corresponding lamp to blink and at the same time prohibits the operation of receiving the operation panel 14.
ON the other hand, when it is determined in step S160 that the signal from the flow sensor 18 is turned ON (YES in step S160), the water valve 16 is opened in response to the output of the communication signal from the microcomputer 21, the washing water is supplied from the water valve 16 to the washing nozzle 15, and the washing water is discharged from the waste water discharge port of the washing nozzle 15 into the toilet 1. That is, when the affirmative determination is made in step S160, the microcomputer 21 opens the water valve 16 in a state where the temperature Tw of the washing water in the heat exchange container 17a is lower than the reference temperature Tref and the safety circuit 30 (1 st and 2 nd comparators 31 and 32) allows the water valve 16 to be opened.
If an affirmative decision is made in step S160 (YES in step S160), the microcomputer 21 outputs a valve closing command for closing the water valve 16, that is, an off signal for turning off the 3 rd switching circuit 35, in order to close the water valve 16 (step S170). Next, the microcomputer 21 turns ON the heater 170 of the heat exchange unit 17 so that the temperature Tw of the washing 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 of step S180, the microcomputer 21 outputs an open valve command of the water valve 16, that is, a connection signal for connecting the 3 rd switching circuit 35 (step S190). In step S150, the microcomputer 21 controls the rotary valve so that the supply destination of the washing water from the heat exchange container 17a becomes the waste water drain port. Then, at the time when the predetermined time (time required for the water valve 16 to open) has elapsed since the on signal was output to the 3 rd switching circuit 35, the microcomputer 21 determines whether or not the signal from the flow sensor 18 is in the OFF state (step S200).
After the temperature Tw of the washing water is raised to the reference temperature Tref by operating the heater 170 in step S180, the on signal is output from the microcomputer 21 to the 3 rd switching circuit 35 in step S190, and at this time, if the 1 st and 2 nd comparators 31 and 32 are normal, a low level signal is output from the output terminals of the 1 st and 2 nd comparators 31 and 32, and thus the 1 st and 2 nd switching circuits 33 and 34 are turned off. In this case, even if the microcomputer 21 outputs the on signal to the 3 rd switching circuit 35, the 1 st and 2 nd switching circuits 33 and 34 are turned off, and the water valve 16 is not opened, so that the washing water is not supplied from the water valve 16 to the washing nozzle 15 (heat exchange container 17 a). That is, when it is determined in step S200 that the signal from the flow sensor 18 is in the OFF state (YES in step S200), the 1 st and 2 nd comparators 31 and 32 (the safety circuit 30) prohibit the water valve 16 from being opened in response to the temperature rise of the washing water in the heat exchanger container 17a, and therefore the water valve 16 does not open.
Therefore, when the affirmative determination is made in step S200 (YES in step S200), the microcomputer 21 outputs a valve closing command for the water valve 16, that is, an off signal for turning off the 3 rd switching circuit 35, as long as the safety circuit 30 is not abnormal (step S210). Further, the microcomputer 21 transmits a lamp turn-off command to the control unit of the operation panel 14 (step S220) to end the blinking display of the lamp of the operation panel 14, thereby terminating the present routine.
ON the other hand, when it is determined in step S200 that the signal from the flow sensor 18 is turned ON (step S200: NO), the water valve 16 is opened in response to the output of the communication signal from the microcomputer 21, the washing water is supplied from the water valve 16 to the washing nozzle 15, and the washing water is discharged from the waste water discharge port of the washing nozzle 15 into the toilet 1. That is, when a negative determination is made in step S200, the microcomputer 21 can open the water valve 16 even if 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 opening of the water valve 16 is to be prohibited by the 1 st and 2 nd comparators 31 and 32 (the safety circuit 30).
Therefore, when a negative determination is made in step S200 (step S200: NO), the microcomputer 21 recognizes that an abnormality has occurred in the safety circuit 30 (1 st and 2 nd comparators 31 and 32), and transmits an abnormal state indicating command to the control unit of the operation panel 14 (step S230), thereby terminating the present routine. In this case, the microcomputer 21 prohibits the operation of the sanitary washing apparatus 10 after transmitting the abnormal state indicating command. Further, if the control section of the operation panel 14 receives an abnormal state indicating instruction from the microcomputer 21, it causes the corresponding lamp to blink, and at the same time, prohibits the operation of receiving the operation panel 14.
As described above, the control device 20 of the sanitary washing apparatus 10 includes the safety circuit 30 and the microcomputer 21, the safety circuit 30 controls the supply of the washing water to the washing nozzle 15 by prohibiting the opening of the water valve 16 in accordance with the temperature Tw of the washing water supplied to the washing nozzle 15, and the microcomputer 21 serves as an abnormality diagnosis unit that performs the abnormality diagnosis routine of fig. 3 to diagnose the presence or absence of an abnormality in the safety circuit 30. The microcomputer 21 then raises the temperature Tw of the cleaning water in the heat exchange container 17a by the heater 170 of the heat exchange unit 17 to reverse the outputs of the 1 st and 2 nd comparators 31 and 32, thereby creating a state in which the safety circuit 30 (the 1 st and 2 nd comparators 31 and 32) prohibits the water valve 16 from opening, and diagnoses the presence or absence of an abnormality in the safety circuit 30 based on the supply state of the cleaning water to the cleaning nozzle 15 side when an open valve command (a connection signal to the 3 rd switching circuit 35) is issued to the water valve 16 (steps S180 to S200 in fig. 3). In this way, by forcibly making a state in which the safety circuit 30 prohibits the opening of the water valve 16 and performing the abnormality diagnosis of the safety circuit 30, the reliability of the safety circuit 30 can be further improved.
Before performing an abnormality diagnosis in a state in which the safety circuit 30 prohibits the opening of the water valve 16 (steps S180 to S200), the microcomputer 21 creates a state in which the safety circuit 30 permits the opening of the water valve 16 (steps S100 to S130), and diagnoses the presence or absence of an abnormality in the safety circuit 30 based on the supply state of the cleaning water to the cleaning nozzle 15 when an open command (a connection signal to the 3 rd switching circuit 35) is issued to the water valve 16 (steps S150 and S160). This makes it possible to diagnose the presence or absence of an abnormality of the safety circuit 30 with higher accuracy, and the reliability of the safety circuit 30 can be further improved.
The safety circuit 30 further includes 1 st and 2 nd comparators 31 and 32, and 1 st and 2 nd switching circuits 33 and 34, the 1 st and 2 nd comparators 31 and 32 outputting signals corresponding to a difference between the voltage signal from the 1 st or 2 nd temperature detectors 171 and 172 and the reference signal, and the 1 st and 2 nd switching circuits 33 and 34 permitting or prohibiting the opening of the water valve 16 based on the signals from the 1 st or 2 nd comparators 31 and 32. This makes it possible to easily form the safety circuit 30 that prohibits the opening of the water valve 16 and restricts the supply of the washing water to the washing nozzle 15 when the washing water has a high temperature.
Further, by issuing a valve opening command (a connection signal to the 3 rd switching circuit 35) to the water valve 16 in a state where the safety circuit 30 allows the water valve 16 to be opened (step S150), and issuing a valve opening command to the water valve 16 in a state where the safety circuit 30 prohibits the water valve 16 from being opened (step S190), it is possible to diagnose the presence or absence of an abnormality of the 1 st and 2 nd comparators 31 and 32 and the 1 st to 3 rd switching circuits 33 to 35 with high accuracy based on the detection value of the flow rate sensor 18 which is the supply state of the washing water. Further, by providing the flow sensor 18 in the sanitary washing apparatus 10, when the valve opening command is issued to the water valve 16 in order to diagnose the presence or absence of an abnormality of the safety circuit 30, it is possible to accurately recognize the supply state of the washing water to the washing nozzle 15 side, that is, whether or not the washing water is supplied to the washing nozzle 15 side, and the flow sensor 18 detects the flow rate of the washing water supplied from the water valve 16 to the washing nozzle 15.
However, the flow sensor 18 may be omitted from the sanitary washing apparatus 10, and in this case, as shown in the abnormality diagnosis routine shown in fig. 4, after an opening command is given to the water valve 16, for example, the temperature gradient dT of the washing water is acquired based on the signal from the 1 st temperature detector 171 (steps S150, S155, S190, S195), and then the presence or absence of an abnormality of the safety circuit 30 is diagnosed based on the acquired temperature gradient dT (steps 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, then operates (turns ON) the heater 170 of the heat exchange unit 17 so that the temperature Tw of the washing water in the heat exchange container 17a becomes higher than the temperature Tw _ in of the washing water supplied to the water valve 16 and lower than the reference temperature Tref, and then stops the heater 170 (step S145). That is, in step S145, the temperature Tw of the washing water in the heat exchange container 17a is increased while the safety circuit 30 (1 st and 2 nd comparators 31 and 32) is kept in a state in which the water valve 16 is allowed to open. Further, after issuing an open valve command (a connection signal to the 3 rd switching circuit 35) to the water valve 16 in step S150, the microcomputer 21 acquires a temperature gradient dT, which is an absolute value of a change amount of the detection value of the 1 st temperature detector 171 in a predetermined time period (step S155). Further, the microcomputer 21 determines whether or not the acquired temperature gradient dT is equal to or greater than a predetermined 1 st threshold value dT1 (positive value) (step S165).
When the water valve 16 is opened by the output of the communication signal from the microcomputer 21 in step S150, the temperature Tw of the washing water in the heat exchange container 17a is rapidly decreased because the washing water flows into the heat exchange container 17a from the water valve 16, and the temperature gradient dT obtained from the detection value of the 1 st temperature detector 171 becomes a relatively large value. In addition, although the safety circuit 30 allows the water valve 16 to be opened, if the water valve 16 is not opened by the output of the communication signal from the microcomputer 21 in step S150, the washing water does not flow into the heat exchange container 17a from the water valve 16, and therefore the temperature Tw of the washing water detected by the 1 st temperature detector 171 is almost constant, and the temperature gradient dT is close to 0. Therefore, when it is determined in step S165 that the temperature gradient dT is lower than the 1 st threshold dT1 (step S165: NO), the microcomputer 21 executes the process of step S230 as a result of recognizing that an abnormality has occurred in the safety circuit 30, and terminates the routine of fig. 4.
On the other hand, when it is determined in step S165 that the temperature gradient dT is equal to or greater than the 1 st threshold dT1 (YES in step S165), the microcomputer 21 executes the processing from step S170 described above. That is, the microcomputer 21 operates the heater 170 to raise the temperature Tw of the washing water to the reference temperature Tref or higher in step S180, and creates a state in which the safety circuit 30 prohibits the opening of the water valve 16. Further, after issuing a valve opening command (a connection signal to the 3 rd switching circuit 35) to the water valve 16 in step S190, the microcomputer 21 acquires a temperature gradient dT, which is an absolute value of a change amount of the detection value of the 1 st temperature detector 171 in a predetermined time period (step S195). Further, the microcomputer 21 determines whether or not the acquired temperature gradient dT is lower than a 2 nd threshold dT0 (positive value) set to be smaller than the 1 st threshold dT1, for example (step S205).
If the water valve 16 is not opened by the output of the communication signal from the microcomputer 21 in step S190, the temperature Tw of the washing water detected by the 1 st temperature detector 171 is almost constant and the temperature gradient dT is close to 0 because the washing water does not flow into the heat exchange container 17a from the water valve 16. In addition, although the safety circuit 30 is in a state of prohibiting the opening of the water valve 16, when the water valve 16 is opened by the output of the communication signal from the microcomputer 21 in step S190, the temperature Tw of the washing water in the heat exchange container 17a is rapidly decreased because the washing water flows into the heat exchange container 17a from the water valve 16, and the temperature gradient dT obtained from the detection value of the 1 st temperature detector 171 becomes a relatively large value.
Therefore, when it is determined in step S205 that the temperature gradient dT is equal to or greater than the 2 nd threshold dT0 (step S205: NO), the microcomputer 21 recognizes that an abnormality has occurred in the safety circuit 30 (1 st and 2 nd comparators 31 and 32), executes the processing of step S230, and terminates the routine of fig. 4. When it is determined in step S205 that the temperature gradient dT is lower than the 2 nd threshold value dT0 (YES in step S205), the microcomputer 21 executes the processing of step S210 and step S220 as if no abnormality has occurred in the safety circuit 30, and terminates the routine of fig. 4. In this way, by obtaining the temperature gradient dT of the washing water after the valve opening command is given to the water valve 16 in order to diagnose the presence or absence of an abnormality of the safety circuit 30, it is possible to accurately recognize the supply state of the washing water to the washing nozzle 15 side, that is, whether the washing water is supplied to the washing nozzle 15 side, based on the temperature gradient dT.
Fig. 5 is an enlarged view of a main portion of another safety circuit 30B applicable to the control device 20 of the sanitary washing device 10. The safety circuit 30B shown in the same figure is used together with the 1 st and 2 nd temperature detectors 171 and 172 as the ptc thermistors, and includes a 1 st voltage dividing circuit 310 and a 2 nd voltage dividing circuit 320, in which the 1 st voltage dividing circuit 310 switches the voltage level of the reference voltage (reference signal) applied to the 1 st comparator 31, and the 2 nd voltage dividing circuit 320 switches the voltage level of the reference voltage (reference signal) applied to the 2 nd comparator 32. The 1 st and 2 nd voltage dividing circuits 310 and 320 have switching elements that are switched by the microcomputer 21, and when the switching elements are turned on, the resistance value on the ground side is lowered, thereby lowering the reference voltage applied to the 1 st or 2 nd comparators 31 and 32 by resistance voltage division. In the example of fig. 5, the 1 st and 2 nd voltage dividing circuits 310 and 320 set the reference voltage to be substantially the same as the voltage output by the 1 st and 2 nd temperature detectors 171 and 172 when the temperature Tw of the washing water is the reference temperature Tref when the switching element is turned off. The 1 st and 2 nd voltage dividing circuits 310 and 320 are formed so that when the switching elements are turned on, the reference voltage is set to be substantially the same as the voltage output by the 1 st and 2 nd temperature detectors 171 and 172 when the temperature Tw of the washing water is, for example, 0 ℃. In this case, as the 1 st and 2 nd temperature detectors 171 and 172, negative temperature coefficient thermistors may be used, and in this case, as the 1 st and 2 nd voltage dividing circuits 310 and 320, circuits for reducing the reference voltage applied to the 1 st or 2 nd comparators 31 and 32 by resistance voltage division when the switching elements are turned on may be used.
When the safety circuit 30B having the 1 st and 2 nd voltage dividing circuits 310 and 320 is provided in the control device 20, as shown in fig. 6, after an open valve command (a connection signal to the 3 rd switching circuit 35) is issued to the water valve 16 in step S170, the switching elements of the 1 st and 2 nd voltage dividing circuits 310 and 320 may be opened to decrease the reference voltages applied to the 1 st and 2 nd comparators 31 and 32 (step S185). Thus, if the 1 st and 2 nd comparators 31 and 32 are normal, even if the temperature Tw of the washing water in the heat exchange container 17a is lower than the reference temperature Tref, the outputs of the 1 st and 2 nd comparators 31 and 32 can be inverted, so that the 1 st and 2 nd switching circuits 33 and 34 can be turned off, and a state in which the safety circuit 30 prohibits the opening of the water valve 16 can be manufactured. As a result, the abnormality diagnosis of the safety circuit 30 (1 st and 2 nd comparators 31 and 32) can be performed without operating the heater 170 of the heat exchange unit 17. As shown in fig. 6, after the abnormality diagnosis of the safety circuit 30 is completed, the switching elements of the 1 st and 2 nd voltage dividing circuits 310 and 320 may be turned on to restore the reference voltages applied to the 1 st and 2 nd comparators 31 and 32 (steps S215 and S235).
In the abnormality diagnostic routine of fig. 3, 4, and 6, it is determined that the safety circuits 30 and 30B are abnormal at the time when the negative determination is made in steps S160, S165, S200, or S205, but it is also possible to determine that the safety circuits 30 and 30B are abnormal at the time when the negative determination is made a plurality of times in steps S160, S165, S200, or S205. In the sanitary washing apparatus 10, since the control device 20 receives the signals from the 1 st and 2 nd temperature detectors 171 and 172 of the heat exchange unit 17, for example, after the processing in steps S210 and S215 is performed, the presence or absence of an abnormality in the 1 st and 2 nd temperature detectors 171 and 172 may be determined by comparing the detection values of the 1 st and 2 nd temperature detectors 171 and 172. In this case, if the difference between the detection values of the 1 st and 2 nd temperature detectors 171 and 172 is equal to or greater than a certain value, it is possible to send an abnormal state indication command to the operation panel 14, assuming that at least one of the 1 st and 2 nd temperature detectors 171 and 172 is abnormal. Further, with respect to the abnormality diagnostic routine of fig. 3, 4, and 6, if the control device is provided with the safety circuit as described above, the abnormality diagnostic routine may be executed in a water storage type sanitary washing apparatus including a heater for heating water from a tap water pipe (water source), a temperature detector, and the like, and provided with a washing tank capable of storing warm water heated by the heater.
The present invention is not limited to the above-described embodiments, and various modifications may be made within the scope of the present invention. Further, the above embodiments are only specific embodiments of the invention described in the summary of the invention, and do not limit the elements of the invention described in the summary of the invention.
[ industrial applicability ]
The present invention can be used in the manufacturing industry of sanitary washing apparatuses.
Description of the symbols
The device comprises a toilet 1, a sanitary washing device 10, a shell 11, a toilet 12, a toilet lid 13, an operation panel 14, a washing nozzle 15, a water valve 16, a heat exchange unit 17, a heat exchange container 17a, a heater 170, a temperature detector 171 st, a temperature detector 172 nd, a temperature detector 2 nd, a flow sensor 18, a seating sensor 19, a control device 20, a microcomputer 21, a heater control circuit 22, a flow sensor detection circuit 23, a safety circuit 30,30B, a comparator 31 st, a comparator 32 nd, a comparator 2 nd, a voltage dividing circuit 310 st, a voltage dividing circuit 320 nd, a voltage dividing circuit 2 nd, a switch circuit 33 st, a switch circuit 34 nd and a switch circuit 3 rd.
Claims (12)
1. A sanitary washing device, characterized in that it comprises: a wash nozzle that sprays wash water to a part of a human body, a valve that allows the wash water to be supplied to the wash nozzle and restricts the supply of the wash water to the wash nozzle, a heater that heats the wash water, a temperature detector that outputs a signal corresponding to a temperature of the wash water supplied to the wash nozzle, and a control device that controls the valve, in the sanitary wash device,
the control device is provided with:
a safety circuit that prohibits opening of the valve to restrict supply of the washing water to the washing nozzle according to a temperature of the washing water supplied to the washing nozzle; and the number of the first and second groups,
and an abnormality diagnosis unit which creates a state in which the safety circuit prohibits the valve from being opened, and diagnoses the presence or absence of an abnormality in the safety circuit based on a state in which the cleaning water is supplied to the cleaning nozzle side when a valve opening command is given to the valve.
2. The sanitary washing device as claimed in claim 1,
the abnormality diagnosis unit creates a state in which the valve opening of the safety circuit is permitted before performing abnormality diagnosis of the safety circuit in a state in which the valve opening of the valve is prohibited by the safety circuit, and diagnoses the presence or absence of an abnormality of the safety circuit based on a state of supply of the washing water to the washing nozzle side when a valve opening command is given to the valve.
3. The sanitary washing device as claimed in claim 2,
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
a switch circuit that permits or prohibits opening of the valve in accordance with a signal from the comparator.
4. The sanitary washing device as claimed in claim 3,
the abnormality diagnosis unit raises the temperature of the washing water by the heater to invert the output of the comparator, thereby creating a state in which the safety circuit prohibits the valve from being opened.
5. The sanitary washing device as claimed in claim 4,
the heater is an instantaneous heater that heats the washing water supplied from the valve to the washing nozzle.
6. The sanitary washing device as claimed in 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 section changes a voltage of the reference signal supplied to the comparator by the voltage dividing circuit, thereby creating a state in which the safety circuit prohibits the valve from being opened.
7. Sanitary washing arrangement according to any one of claims 3 to 6,
the sanitary washing device comprises two temperature detectors,
the safety circuit comprises two comparators, two switch circuits and a 3 rd switch circuit, the two comparators are respectively connected with the corresponding temperature detectors, the two switch circuits are respectively connected with the corresponding comparators, the 3 rd switch circuit is controlled by the control device to be switched on and off,
in a state where the opening of the valve is permitted by the two switching circuits based on signals from the two comparators, if the 3 rd switching circuit is turned on by the control device, the valve is opened.
8. Sanitary washing arrangement according to any one of claims 1 to 6,
the sanitary washing apparatus further includes a flow sensor that detects a flow rate of the washing water supplied from the valve to the washing nozzle,
the abnormality diagnosis unit diagnoses the presence or absence of an abnormality in the safety circuit based on a detection value of the flow sensor when a valve opening command is given to the valve.
9. The sanitary washing device as claimed in claim 7,
the sanitary washing apparatus further includes a flow sensor that detects a flow rate of the washing water supplied from the valve to the washing nozzle,
the abnormality diagnosis unit diagnoses the presence or absence of an abnormality in the safety circuit based on a detection value of the flow sensor when a valve opening command is given to the valve.
10. Sanitary washing arrangement according to any one of claims 1 to 6,
the abnormality diagnosis unit obtains a temperature gradient of the washing water based on a signal from the temperature detector after an open valve command is issued to the valve, and diagnoses the presence or absence of an abnormality in the safety circuit based on the obtained temperature gradient.
11. The sanitary washing device as claimed in claim 7,
the abnormality diagnosis unit obtains a temperature gradient of the washing water based on a signal from the temperature detector after an open valve command is issued to the valve, and diagnoses the presence or absence of an abnormality in the safety circuit based on the obtained temperature gradient.
12. Sanitary washing arrangement according to any one of claims 1 to 6,
the abnormality diagnosis unit determines the presence or absence of a user of a toilet stool in which the sanitary washing device is installed, and if it is determined that the toilet stool is not used, performs abnormality diagnosis of the safety circuit.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2017-098214 | 2017-05-17 | ||
| JP2017098214A JP6869469B2 (en) | 2017-05-17 | 2017-05-17 | Sanitary cleaning equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108951792A CN108951792A (en) | 2018-12-07 |
| CN108951792B true CN108951792B (en) | 2020-06-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810474698.9A Active CN108951792B (en) | 2017-05-17 | 2018-05-17 | Sanitary cleaning device |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP6869469B2 (en) |
| CN (1) | CN108951792B (en) |
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| JP5461781B2 (en) * | 2008-03-11 | 2014-04-02 | パナソニック株式会社 | Sanitary washing device |
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Also Published As
| Publication number | Publication date |
|---|---|
| JP2018193764A (en) | 2018-12-06 |
| JP6869469B2 (en) | 2021-05-12 |
| CN108951792A (en) | 2018-12-07 |
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