JP2018150747A - Sanitary washing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To determine quickly whether a nozzle is clogged or not when a nozzle ejecting washing water is changed and to inhibit a tube from being detached due to clogging occurring in a nozzle without increasing the number of components.SOLUTION: When a state in which washing water is ejected from any nozzle of a plurality of nozzles by driving an electric switch valve is switched to a state in which washing water is ejected from another nozzle, it is determined that the other nozzle is clogged in a case where a rotational period of a rotary blade in a flow sensor reaches a predetermined or higher period within a predetermined time after the start of switching. Thus, because it can be determined whether the nozzle is clogged or not before a stop of the rotary blade, a water cutoff solenoid valve can be closed before a tube is detached.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a sanitary washing device.

  Conventionally, this type of sanitary washing apparatus has a water stop solenoid valve, a water pump, and a flow rate sensor, and determines abnormality based on the flow rate detected by the flow rate sensor every period from the start of washing. It has been proposed (see, for example, Patent Document 1). In this sanitary washing apparatus, when the flow rate a in the period A from the start of cleaning to the opening of the water stop solenoid valve is not 0, it is determined that an abnormality has occurred in the water stop solenoid valve, and the water stop solenoid valve is opened. When the flow rate b in the period B until the water pump is turned on is 0, it is determined that an abnormality has occurred in the water stop solenoid valve, and the flow rate c in the period C after the water pump is turned on is the period When the flow rate b is lower than B, it is determined that an abnormality has occurred in the water pump.

  In addition, a water stop solenoid valve, a sub-tank, a water pump, a relief valve, a flow control valve, and a nozzle device are provided in this order from the upstream side, and the recirculation is performed to return cleaning water discharged from the relief valve to the sub-tank. A sanitary washing apparatus including a flow path has also been proposed (see, for example, Patent Document 2). In this sanitary washing device, when an abnormality occurs in the flow control valve and the water pressure in the flow path rises, the relief valve is opened to prevent the water pressure in the flow path from rising abnormally.

JP 2011-220061 A JP 2006-199931 A

  Generally, sanitary washing devices have a water stop solenoid valve, a heater, a water pump, a switching valve, and a plurality of nozzles, some of which are made of tubes as needed for ease of assembly and parts replacement. It is connected. Examples of the plurality of nozzles include a butt nozzle, a bidet nozzle, an in-bath cleaning nozzle, a nozzle cleaning nozzle, and the like, so that cleaning water can be ejected from any of the nozzles by a switching valve. It has become. In such a sanitary washing device, it is possible to detect whether or not the nozzle is clogged by making the flow rate from the flow rate sensor close to the value 0, but when the nozzle that is spraying the wash water is changed When the nozzle after the change is clogged, the rotor blades of the flow sensor are rotating due to inertia, so the value does not instantaneously become zero, and it takes time to detect the abnormality. At this time, the water pressure in the flow path may rise abnormally and the tube may come off. In order to cope with an abnormal increase in the water pressure in the flow path, it is conceivable to provide a relief valve and a return flow path, but in that case, the number of parts increases.

  The main purpose of the sanitary washing apparatus of the present invention is to quickly determine whether or not a nozzle is clogged when the nozzle from which washing water is sprayed is changed.

  The sanitary washing apparatus of the present invention has taken the following means in order to achieve the above-mentioned main object.

The sanitary washing device of the present invention is
A plurality of nozzles for ejecting wash water from the wash water flow path, a water stop solenoid valve that controls the supply of wash water to the wash water flow path, and a flow rate of wash water flowing through the wash water flow path as a rotation period of the rotor blades A sanitary washing apparatus comprising: a flow sensor to detect; an electric switching valve that switches supply of cleaning water to the plurality of nozzles; and a control device that drives and controls the water stop solenoid valve and the electric switching valve. ,
When the control device is switched from a state in which cleaning water is ejected from one of the plurality of nozzles by driving the electric switching valve to a state in which cleaning water is ejected from another nozzle, It is determined that the other nozzle is clogged when the rotation period of the rotor blades of the flow sensor reaches a predetermined period or more within a predetermined time from the start of switching.
It is characterized by that.

  In the sanitary washing device of the present invention, when the electric switching valve is driven to switch from the state where the washing water is ejected from any one of the plurality of nozzles to the state where the washing water is ejected from the other nozzles. When the nozzles of the flow sensor are not clogged, the number of rotations according to the level of the washing water jetted from the nozzle before switching depends on the level of jetting of the washing water from the other nozzles. Rotate to the new rotation speed. On the other hand, when other nozzles are clogged, the rotor blades of the flow sensor rotate at a speed that is reduced according to the inertia of the rotor blades from the number of rotations according to the degree of ejection of the washing water from the nozzle before switching. Decrease and stop. In the sanitary washing device of the present invention, since it is determined that other nozzles are clogged when the rotation cycle of the rotor blades of the flow sensor reaches a predetermined cycle or more within a predetermined time after switching is started, It is possible to quickly determine whether the nozzle is clogged before it stops. Here, if a time slightly shorter than the time required for the water pressure in the washing water flow path to reach the water pressure at which the tube is detached when other nozzles are clogged is used as the predetermined time, the water pressure in the washing water flow path is used. It can be determined that the nozzle is clogged before the water pressure reaches the level at which the tube can be removed. In this case, the tube can be prevented from coming off by immediately closing the water stop solenoid valve. As a result of these, it is possible to quickly determine whether or not the nozzle is clogged when changing the nozzle from which the cleaning water is ejected, and the nozzle is clogged without increasing the number of parts. And it can suppress that a tube remove | deviates.

  In such a sanitary washing device of the present invention, the predetermined period is such that the washing water is ejected from the nozzle having the smallest ejection amount among the plurality of nozzles by using a flow rate sensor in which the rotor blade is most difficult to rotate due to manufacturing variation. It is good also as what is set to the period later than the rotation period of the said rotary blade in the state which exists. In this way, it is possible to accurately determine that the nozzle is clogged even if the degree of rotation of the rotor blades varies due to manufacturing variations.

  In the sanitary washing device of the present invention, the predetermined cycle is set to a larger cycle as the rotation cycle of the rotor blades of the flow sensor before switching to a state in which cleaning water is ejected from the other nozzles is larger. It is good. In this way, it can be determined that the nozzle is clogged more accurately.

  In the sanitary washing device of the present invention, the predetermined period may be set for each type of the other nozzle. This is based on the fact that the degree to which the washing water is jetted differs depending on the type of nozzle. By doing so, it is possible to determine whether the nozzle is clogged more accurately for each type.

  In the sanitary washing device of the present invention, the control device prohibits the ejection of washing water from the other nozzles when it is determined that the other nozzles are clogged once or a plurality of times. Also good. If it carries out like this, it can suppress that the hydraulic pressure of a washing water flow path becomes high by use of the nozzle which has produced clogging. In this case, the washing water can be ejected from nozzles other than the nozzle that is clogged. In addition, if it is determined that the nozzle is clogged multiple times, the nozzle is clogged due to disturbance such as air trapping in the water supply pipe if it is prohibited to eject cleaning water from the nozzle. It can prevent misjudging that it has occurred. In this aspect, when the reset operation is performed, the control device may cancel the prohibition of the washing water jet from the other nozzles. If it carries out like this, the use after clogging can be made easy.

It is a lineblock diagram showing the outline of the composition of sanitary washing device 20 as an embodiment of the present invention typically. 2 is a configuration diagram schematically showing an outline of a configuration of a flow sensor 34. FIG. 4 is a flowchart illustrating an example of a clogging determination process executed by a control device 60. 4 is a flowchart illustrating an example of a clogging process executed by a control device 60. It is explanatory drawing which shows an example of the time change of the water pressure of a washing water flow path, and a rotation period waveform. It is a flowchart which shows an example of the clogging determination process of a modification. It is explanatory drawing which shows an example of the map for a correction coefficient setting.

  Next, the form for implementing this invention is demonstrated. FIG. 1 is a configuration diagram showing an outline of a configuration of a sanitary washing device 20 as an embodiment of the present invention. The sanitary washing device 20 of the embodiment is used by being attached to a toilet seat (not shown), and as shown in the drawing, a water stop electromagnetic valve 22 that controls supply of water from the water supply pipe 12 to the wash water flow path 24, and a wash water flow path. 24, a tank assembly 30 having a heat exchanger 32 and a flow rate sensor 34, a pulsation pump 42, a vacuum breaker 44, a switching valve 46, a plurality of nozzles 50 to 58, and a control device 60. And comprising.

  As shown in FIG. 2, the flow sensor 34 includes a rotor blade 35 having six blades attached thereto, a magnet 36 attached to the rotor blade 35 at a position eccentric from the rotation axis, and a magnetic force generated by the magnet 36. And a coil 37 to be generated. The flow sensor 34 detects the change in magnetic force by the coil 37 due to the rotation of the rotating blades 35 due to the flow of the washing water, and the rotation of the rotating blades 35 based on the change period of the magnetic force.

  The switching valve 46 is a rotary switching valve that switches from which of the plurality of nozzles 50 to 58 the washing water in the washing water flow path 24 downstream from the pulsating pump 42 that adjusts the strength of washing as needed. It is configured. In this embodiment, each discharge port of the switching valve 46 is connected to each nozzle 50 to 58 by a tube.

  In the present embodiment, the plurality of nozzles 50 to 58 cleans the powerful nozzle 50 for cleaning the buttocks, the mild nozzle 52 for cleaning the buttocks, the bidet nozzle 54 for the bidet, the powerful nozzle 50, the mild nozzle 52, and the bidet nozzle 54. And a spray nozzle 58 for spraying wash water into the toilet bowl in a spray form.

  Although not shown, the control device 60 is configured as a microcomputer centered on a CPU, and includes a ROM, a RAM, and an input / output port in addition to the CPU. A rotation period signal from the coil 37 of the flow sensor 34, a switch signal such as a reset switch 62 from a control panel (not shown), and the like are input to the control device 60 via an input port. From the control device 60, a drive signal to the water stop solenoid valve 22, a control signal to the heat exchanger 32, a drive signal to the pulsation pump 42, a drive signal to the switching valve 46, an abnormality display section 64 of a control panel (not shown). A display control signal is output through the output port.

  Next, the operation of the sanitary washing device 20 of the embodiment configured as described above, particularly the operation when determining whether or not the nozzle is clogged when the nozzle that is spraying the washing water is switched will be described. In the present embodiment, when the washing water is ejected from any one of the nozzles 50 to 58, first, in order to discharge the cold water from the heat exchanger 32 to the switching valve 46, the switching valve 46 has a flow rate with the largest flow rate. The power nozzle 50 is switched to the power nozzle 50, and the washing water is ejected from the powerful nozzle 50 in a state where the nozzle 50 is housed in a guide case (not shown). Thereafter, the switching valve 46 is driven so that the washing water is ejected from the selected nozzle. FIG. 3 is a flowchart illustrating an example of the clogging determination process executed by the control device 60 when cleaning water is ejected from the powerful nozzle 50.

  When the clogging determination process is executed, the control device 60 first waits to start switching from a state in which cleaning water is being ejected from the powerful nozzle 50 to a state in which cleaning water is being ejected from another nozzle. (Step S100). Whether or not switching has started can be determined by whether or not the operation of the switching nozzle 46 has started.

  When it is determined in step S100 that the switching has started, it is determined whether or not the rotation period T of the rotor blades 35 of the flow rate sensor 34 has reached the threshold value Tref within a predetermined time after the switching is started (steps S110 to S130). ). Specifically, the rotation period T of the rotor blade 35 is input (step S110), and it is determined whether or not the rotation period T is equal to or greater than the threshold value Tref (step S120), and switching is performed when the rotation period T is less than the threshold value Tref. It is determined whether or not a predetermined time has elapsed since the start of the operation (step S130). When the predetermined time has not elapsed, the process of returning to the input of the rotation period T of the rotor blade 35 in step S110 is performed. Is repeated until it is determined that is equal to or greater than the threshold value Tref or it is determined in step S130 that a predetermined time has elapsed. Here, the threshold value Tref is determined by using a flow rate sensor in which the rotor blade 35 is most difficult to rotate due to manufacturing variation or the like, and the cleaning water from a nozzle (spray nozzle 58 in the embodiment) having the smallest ejection amount among the plurality of nozzles 50 to 58. This is a cycle (time) that is slower than the rotation cycle Tslow of the rotary blade 35 in the state where the nozzle is ejected. The predetermined time is slightly longer than the time required from when switching by the switching valve 46 is started until the water pressure in the washing water flow path 24 reaches a pressure at which the tube comes off when the nozzle to be switched is clogged. It's a short time.

  If it is determined that the rotation period T of the rotor blade 35 has not reached the threshold value Tref within a predetermined time after the start of switching, it is determined that the nozzle at the switching destination is not clogged, and this routine is terminated. On the other hand, when it is determined that the rotation period T of the rotor blade 35 has reached the threshold value Tref within a predetermined time from the start of the switching, it is determined that the switching destination nozzle is clogged (step S140). Exit.

  In the present embodiment, when it is determined in the clogging determination process in FIG. 3 that the switching destination nozzle is clogged, the control device 60 executes the clogging process in FIG. In the clogging process, first, the water stop solenoid valve 22 is closed (step S200). Thereby, it can suppress that the water pressure of the washing water flow path 24 reaches the pressure of the grade which a tube remove | deviates. Then, the use of the nozzle that is determined to be clogged is prohibited (step S210), and the fact that a clogging abnormality has occurred is displayed on the abnormality display section 64 of the control panel (not shown) to notify the user (step S220). Accordingly, it is possible to allow the cleaning water to be ejected from nozzles other than the nozzle that has been determined to be clogged, and to notify the user that an abnormality has occurred. When the reset switch 62 of the control panel (not shown) is operated and reset (step S230), the use prohibition of the nozzle determined to be clogged is released (step S240), and this process is terminated. . Accordingly, it is possible to eject the cleaning water from the nozzle that is determined to be clogged.

  FIG. 5 shows an example of the temporal change of the water pressure in the cleaning water flow path 24 and the detection waveform (rotation period waveform) of the flow sensor 34 when the nozzle that ejects the cleaning water is switched when the nozzle to be switched is clogged. It is explanatory drawing which shows. In the figure, Pref of the washing water pressure is the water pressure at which the tube is released. The rotation period waveform 1 is a detection waveform of the rotor blade that is detected when the nozzle of the switching destination is clogged using a flow rate sensor in which the rotor blade 35 is most likely to rotate due to manufacturing variation or the like. The rotation period waveform 2 is a detection waveform of the rotor blade that is detected when the nozzle of the switching destination is not clogged using a flow rate sensor in which the rotor blade 35 is most difficult to rotate due to manufacturing variation or the like. The threshold value Tref described above is represented as a period (time) slightly larger than the period Tslow of the rotation period waveform 2 in FIG. In FIG. 5, the predetermined time is a time slightly before the time t3 from the time t1 when the switching by the switching valve 46 is started to the water pressure Pref at which the water pressure in the washing water flow path 24 is such that the tube is detached due to nozzle clogging. Expressed as the time to t2 (t2-t1). Therefore, when the rotation period Tfast of the rotation period waveform 1 reaches the threshold value Tref or more by the time t2, it is determined that the nozzle is clogged.

  In the sanitary washing device 20 according to the embodiment described above, when switching from the state where the washing water is ejected from the powerful nozzle 50 to the state where the washing water is ejected from another nozzle, a predetermined time (t2-t1) from the start of the switching. When the rotation period T of the rotor blades 35 of the flow rate sensor 34 reaches or exceeds the threshold Tref, it is determined that the switching destination nozzle is clogged. Thereby, it is possible to determine an abnormality in which the switching destination nozzle is clogged before the water pressure in the washing water flow path 24 reaches a pressure at which the tube is detached. When it is determined that clogging has occurred, the water stop solenoid valve 22 is immediately closed. Thereby, it can suppress that the water pressure of the washing water flow path 24 becomes high and the tube comes off. As a result of these, it is possible to quickly determine whether or not the nozzle is clogged when changing the nozzle from which the cleaning water is ejected, and the nozzle is clogged without increasing the number of parts. And it can suppress that a tube remove | deviates.

  Further, in the sanitary washing device 20 of the embodiment, when it is determined that the nozzle is clogged, it is possible to notify the user of the abnormality in which the nozzle is clogged by notifying the clogging abnormality. In addition, when it is determined that the nozzle is clogged, only the nozzle having the clogged is prohibited, so that another nozzle can be used. Further, by operating the reset switch 62 after eliminating the nozzle clogging, the use prohibition of the nozzle that has clogged is released. Thereby, the sanitary washing apparatus 20 can be easily made into a normal state.

  In the sanitary washing device 20 of the above-described embodiment, the cleaning water is ejected from the nozzle with the smallest ejection amount using the flow rate sensor in which the rotor blade 35 is most difficult to rotate due to manufacturing variation or the like as the threshold value Tref for judging clogging. The period (time) is slower than the rotation period Tslow of the rotary blade 35 in FIG. However, the threshold value Tref may be changed according to the rotation period T of the rotary blade 35, or the threshold value Tref may be changed according to the type of the switching destination nozzle. A flowchart of an example of the clogging determination process in this case is shown in FIG. In the clogging determination process of FIG. 6, the correction coefficient k1 is set based on the rotation period T of the rotary blade 35 (step S70), and the correction coefficient k2 is set according to the type M of the switching destination nozzle (step S80). Then, the threshold value Tref is determined by multiplying the reference period Tset by the correction coefficients k1 and k2 (step S90). Here, the reference period Tset is a threshold for determining whether the standard nozzle is clogged based on the rotation period Tst of the rotor blade 35 of the standard flow sensor 34, and the cleaning water is supplied from the standard nozzle. The period (time) is as large as can be determined with respect to the rotation period of the rotor blades 35 of the standard flow rate sensor 34 in the ejected state. The correction coefficient k1 is defined as a relationship in which the correction coefficient k1 increases as the rotation period T increases with the value 1.0 at the rotation period Tst of the rotor blade 35 of the standard flow sensor 34. As the correction coefficient k1, for example, the relationship between the rotation period T of the rotor blade 35 and the correction coefficient k1 is determined in advance and stored as a correction coefficient setting map, and when the rotation period T is given, the corresponding correction coefficient k1 from the map. Can be set by deriving. An example of the correction coefficient setting map is shown in FIG. The correction coefficient k2 is a standard flow rate sensor when the wash water is ejected from each nozzle with respect to the rotation period Tst of the rotor blade 35 of the standard flow rate sensor 34 when the wash water is ejected from the standard nozzle. It is determined as a ratio (T / Tst) of the rotation period T of the 34 rotating blades 35. Therefore, the threshold value Tref is set to be larger as the rotation period T is larger. When the threshold value Tref is set in this manner, as in the clogging determination process of FIG. 3, the switching waits for the start of switching (step S100), and the rotation period T of the rotor blade 35 is set to the threshold value Tref within a predetermined time after starting the switching. The process (steps S110 to S140) for determining whether or not the nozzle is clogged depending on whether or not the above has been reached is performed. In this way, by setting the threshold value Tref according to the rotation period T of the rotary blade 35 and the type of the switching destination nozzle, it is possible to determine whether the nozzle is clogged more accurately. In the modification, the threshold value Tref is set according to the rotation period T of the rotary blade 35 and the type of the switching destination nozzle. However, the threshold value Tref is set regardless of the type of the switching destination nozzle. The threshold value Tref may be set according to the type of nozzle to be switched regardless of the rotation period T of the rotary blade 35.

  In the sanitary washing device 20 of the embodiment, when it is determined that the nozzle is clogged, the use of the nozzle that is immediately determined to be clogged is prohibited, but the same nozzle is clogged multiple times. When it is determined that the nozzle has occurred, the use of the nozzle may be prohibited. By doing so, it is possible to prevent erroneous determination that the nozzle is clogged due to disturbance such as air entrapment in the water pipe.

  In the sanitary washing device 20 according to the embodiment, when it is determined that the nozzle is clogged, the clogging abnormality is notified by displaying it on the control panel. It is good also as what alert | reports.

  In the sanitary washing device 20 of the embodiment, when it is determined that the nozzles are clogged, only the use of the clogged nozzles is prohibited, but the use of all the nozzles 50 to 58 is prohibited. The nozzles that are clogged may not be prohibited.

  In the sanitary washing device 20 of the embodiment, the use prohibition of the nozzle that has been clogged is canceled by operating the reset switch 62, but the use of the nozzle that has been clogged when the power is turned on again is prohibited. It is good also as what cancels | releases.

  As mentioned above, although the form for implementing this invention was demonstrated, this invention is not limited to such embodiment at all, and it can implement with a various form in the range which does not deviate from the summary of this invention. Of course.

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

  12 Water supply pipe, 20 Sanitary washing device, 22 Water stop solenoid valve, 24 Wash water flow path, 30 Tank assembly, 32 Heat exchanger, 34 Flow rate sensor, 35 Rotary blade, 36 Magnet, 37 Coil, 40 Nozzle assembly, 42 Pulsating pump , 44 Vacuum breaker, 46 switching valve, 50 powerful nozzle, 52 mild nozzle, 54 bidet nozzle, 56 cleaning nozzle, 58 spray nozzle, 60 control device, 62 reset switch, 64, abnormality display section.

Claims (6)

A plurality of nozzles for ejecting wash water from the wash water flow path, a water stop solenoid valve that controls the supply of wash water to the wash water flow path, and a flow rate of wash water flowing through the wash water flow path as a rotation period of the rotor blades A sanitary washing apparatus comprising: a flow sensor to detect; an electric switching valve that switches supply of cleaning water to the plurality of nozzles; and a control device that drives and controls the water stop solenoid valve and the electric switching valve. ,
When the control device is switched from a state in which cleaning water is ejected from one of the plurality of nozzles by driving the electric switching valve to a state in which cleaning water is ejected from another nozzle, It is determined that the other nozzle is clogged when the rotation period of the rotor blades of the flow sensor reaches a predetermined period or more within a predetermined time from the start of switching.
Sanitary washing device characterized by that. The sanitary washing device according to claim 1,
The predetermined cycle is a rotation cycle of the rotor blades in a state where cleaning water is ejected from a nozzle having the smallest ejection amount among the plurality of nozzles using a flow rate sensor in which the rotor blades are most difficult to rotate due to manufacturing variations. Set to a slower period,
Sanitary washing device. The sanitary washing device according to claim 1,
The predetermined period is set to a larger period as the rotation period of the rotor blades of the flow sensor before switching to a state in which washing water is ejected from the other nozzles is greater.
Sanitary washing device. The sanitary washing device according to claim 1 or 3,
The predetermined period is set for each type of the other nozzles,
Sanitary washing device. The sanitary washing device according to any one of claims 1 to 4,
The control device prohibits the ejection of washing water from the other nozzle when it is determined that the other nozzle is clogged once or a plurality of times.
Sanitary washing device. The sanitary washing device according to claim 5,
When the reset operation is performed, the control device cancels the prohibition of the ejection of washing water from the other nozzles.
Sanitary washing device.

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